Objective The middle turbinate axilla(MTA)is a crucial anatomical landmark for localizing the lacrimal sac(LS)during endonasal dacryocystorhinostomy(En-DCR).Despite being a standard surgical procedure,En-DCR may lead ...Objective The middle turbinate axilla(MTA)is a crucial anatomical landmark for localizing the lacrimal sac(LS)during endonasal dacryocystorhinostomy(En-DCR).Despite being a standard surgical procedure,En-DCR may lead to severe complications,such as cerebrospinal fluid(CSF)leakage,which is closely associated with anatomical variations between the LS and the anterior skull base(ASB).This study aimed to investigate the anatomical location of the LS relative to the MTA and ASB in Chinese patients with nasolacrimal duct obstruction(NLDO)and analyze the influencing factors.Methods This cross-sectional study enrolled 227 Chinese patients who were diagnosed with NLDO and underwent computed tomographic dacryocystography(CT-DCG).Anatomical distances between LS and MTA,as well as LS and ASB,were measured using CT-DCG images.Results The mean distances from the superior and inferior edges of the LS to the MTA were 9.94±4.70 mm and−0.23±4.15 mm,respectively.Male patients showed significantly more superior–anterior displacement of the LS compared to female patients(P<0.001),while patients with chronic dacryocystitis(CD)had an inferior and posterior LS position relative to those with simple NLDO(P=0.005,P=0.001).The mean distance from the intersection(Point P)of the superior and posterior boundaries of the LS to the ASB(MP)was 18.35±4.48 mm,which was shorter in females and those with frontal sinus aplasia(P=0.001;P<0.001).A subgroup(28/227,12.3%)with a critical anatomical feature was identified,where the distance from Point Q(10 mm posterior to P)to the ASB(NQ distance)was≤10 mm.This subgroup had a higher prevalence of complete supra-MTA LS positioning(71.4%vs.41.2%,P=0.003).Conclusion Preoperative CT-DCG provides essential anatomical insights into the spatial relationship between the LS and MTA in Chinese patients with NLDO.The LS position varies significantly by gender and disease type,with males showing more superior–anterior and CD patients more inferior–posterior positioning relative to the MTA.Special attention should be paid to patients with frontal sinus aplasia or LS entirely above the MTA to minimize the risk of CSF leakage during En-DCR.展开更多
BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,dif...BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,differentiating between turbinate hypertrophy and turbinate mucocele is difficult.Radiological examinations,such as computed tomography(CT)or magnetic resonance imaging(MRI),are essential for the accurate diagnosis of turbinate mucocele.Herein,we report three cases of mucocele or pyogenic mucocele of turbinate,including their clinical presentation,imaging findings,and treatments,to help rhinologists understand this condition better.CASE SUMMARY Three cases of turbinate and pyogenic mucocele were encountered in our hospital.In all patients,nasal obstruction and headache were the most common symptoms,and physical examination revealed hypertrophic turbinates.On CT scan,mucocele appeared as non-enhancing,homogeneous,hypodense,well-defined,rounded,and expansile lesions.Meanwhile,MRI clearly illustrated the cystic nature of the lesion on T2 sequences.Two patients with inferior turbinate mucocele underwent mucocele lining removal,while the patient with pyogenic mucocele underwent endoscopic middle turbinate marsupialization.The patients were followed up on the first,third,sixth month,and 1 year after discharge,and no complaints of headache and nasal congestion were reported during this period.CONCLUSION In conclusion,both CT and MRI are helpful in the diagnosis of turbinate or pyogenic mucocele.Additionally,endoscopic nasal surgery is considered to be the most effective treatment method.展开更多
Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divid...Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divided into an observation group（n=31） and a control group（n=30）.In the observation group,electroacupuncture was applied to Sìbái（四白 ST 2）,Xiàguān（下关 ST 7）,Hégǔ（合谷 LI 4） and Zhīgōu（支沟 TE 6） on the left side for the anesthesia and the routine local anesthesia was done on the right side.In the control group,the routine local anesthesia was adopted on both sides.The feelings of pain,circulatory index and operation effect were observed and compared between the two groups.Results During radiofrequency ablation,the pain grades of two measurements on the left side and the 2nd measurement on the right in the observation group were all lower than those in the control group（all P〈0.05）.In the observation group,the pain grade on the left side was lower than that on the right side（P〈0.05）,and the systolic blood pressure and the heart rate were lower than those in the control group when undergoing the 2nd radiofrequency ablation on the right side and on the left side,respectively（all P〈0.05）.There was no significant difference in operation effect between the two groups.Conclusion Electroacupuncture compound anesthesia can meet the analgesia requirement of radiofrequency ablation for hypertrophic inferior turbinate,and would be helpful to prevent cyclic fluctuation during the operation at the same time.展开更多
BACKGROUND The nasal bone,being the most protruding bone in the center of the facial bones,is particularly susceptible to damage.Nasal bone fractures can often result in secondary deformation and dysfunction of the no...BACKGROUND The nasal bone,being the most protruding bone in the center of the facial bones,is particularly susceptible to damage.Nasal bone fractures can often result in secondary deformation and dysfunction of the nose,including septal fractures.Studies on functional or intra-nasal complications have been rarely reported after nasal bone fracture reduction.AIM To evaluate the severity of nasal obstruction and its improvement following nasal bone fracture reduction using inferior turbinoplasty.METHODS We conducted a retrospective review of data from 50 patients with symptomatic nasal obstruction between January to December 2010.All patients underwent preoperative Computed tomography evaluation,and symptom changes and nasal cavity volume were analyzed using a visual analog scale and acoustic rhinometry before and after surgery.Closed reduction and out-fracture of both inferior turbinates performed by the same surgeon.Treatment outcomes were assessed by comparing changes in the nasal airway volume measured using acoustic rhinometry before and after surgery.The minimal cross-sectional area(MCA)was also analyzed based on the Stranc classification.RESULTS Before reduction,the mean MCA for all cases was 0.59±0.06 cm^(2),which represented an 11%decrease compared to the average size of a Korean adult(0.65±0.03 cm^(2)).The MCA for frontal impact was 0.60±0.02 cm^(2) and for lateral impact,it was 0.58±0.03 cm^(2).After reduction via inferior turbinoplasty,the MCA improved to 0.64±0.04 cm^(2).CONCLUSION This study suggests that turbinoplasty is helpful in addressing nasal obstruction.Out-fracture of the inferior turbinate is an effective and durable technique that can be easily performed to enlarge the nasal airway with minimal morbidity.展开更多
Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In...Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In contrast, KTP (potassium titanyl phosphate) laser treatment spares the medial part of the inferior turbinate mucosa, contributing to maintenance of physiological nasal function. A retrospective comparative clinical study was performed to reveal the advantages and side-effects of both surgical methods in medium- and long-term in allergic rhinitis and non-allergic patients. Furthermore, we wished to determine the exact indications of the up-to-date laser treatment. Ninety-one of the 117 patients who underwent bilateral turbinate surgery during an 8-year period (2000-2007) responded to our questionnaire focusing on subjective postoperative changes. Patients were separated into 6 groups, based on the type of operation they underwent, the length of the follow-up and whether they suffered from allergies. The major complaint, nasal obstruction, improved in all 6 groups, which reached significance (p ? 0.05) in 4 groups. The most pronounced improvement was observed in the group of non-allergic patients with medium-term follow-up who underwent mucotomy. Nevertheless, a serious side- effect: crusting also increased significantly (p ? 0.05) in the latter group, while it was absent in allergic patients with medium-term follow-up, who underwent mucotomy. These results lead us to propose the following protocol for the treatment of inferior turbinate hyperplasia: 1) after unsuccessful conservative treatment, laser treatment is suggested for non-allergic patients;2) following unsuccessful conservative and even repeated laser treatment in the allergic group, mucotomy or turbinoplasty should be attempted.展开更多
Objective:Nasal packing is routinely applied after septoplasty.Patients,however,report feeling very uncomfortable while the packing is in place.The aim of this study was to compare the effects of nasal septum suture c...Objective:Nasal packing is routinely applied after septoplasty.Patients,however,report feeling very uncomfortable while the packing is in place.The aim of this study was to compare the effects of nasal septum suture combined with inferior turbinate coblation to the effects of nasal packing after septoplasty.Methods:In this study,135 patients undergoing septoplasty were divided into 3 groups:group 1 patients had microdebrider with packing,group 2 received coblation with packing and group 3 had coblation with suture.Early postoperative quality of life and complications were compared between the 3 groups.Results:The patients in group 1 experienced the most postoperative nasal pain,headache,dysphagia,sleep disturbance and bleeding on the night of surgery;while the patients in group 3 experienced the fewest symptoms.No difference in epiphora was observed between the 3 groups.More pain and bleeding were experienced when comparing the pack removal (Group 1 and 2) with the clearance of the nasal cavity (Group 3).We noted one case of postoperative bleeding in group 1,one septal hematoma in group 1 and a second septal hematoma in group 2.No such postoperative complications were found in group 3.Conclusion:Nasal septum suture combined with inferior turbinate coblation was not only associated with less pain,increased patient satisfaction and an improved quality of life;but also reduced postoperative complications.Our results confirm that it is a more comfortable,reliable alternative to the more common nasal packing.展开更多
Objectives:Resection of the middle turbinate(MT)during endoscopic sinus surgery(ESS)has been a controversial topic among otolaryngologists for many years.Some studies advocate resection and have shown improved outcome...Objectives:Resection of the middle turbinate(MT)during endoscopic sinus surgery(ESS)has been a controversial topic among otolaryngologists for many years.Some studies advocate resection and have shown improved outcomes postoperatively,while studies favoring preservation show a decreased incidence of postoperative complications.The current practice pattern regarding this subject is unknown.The goal of this study was to learn the current practice of MT resection during ESS among otolaryngologists.Method:We performed an electronic anonymous survey of practicing otolaryngologists.Results:We found that the majority of the 252 responders stated that they will perform an MT resection in certain clinical situations,while there is a small subset that advocates never resecting the MT for inflammatory sinus disease(n=6,2.4%).Participants were significantly more likely to perform MT resection in patients undergoing revision compared to primary ESS for all conditions included.The complication of greatest concern among participants was iatrogenic frontal sinus obstruction,while empty nose was of the least concern.The majority of participants responded that MT resection was of extreme or moderate benefit for improved visualization and drug delivery postoperatively.When compared to general otolaryngologists,fellowship-trained rhinologists were less concerned about potential complications following MT resection and were more likely to perceive an extreme or moderate benefit from turbinate resection postoperatively.Conclusion:There remains debate over MT resection among otolaryngologists,but the results of this study show that the majority of participating otolaryngologists will perform a resection in certain clinical situations.展开更多
The coupling effects among the flow field,temperature distribution and structural deformation in a turbine cannot be ignored,particularly during flight cycles when the turbine experiences varied operational states.Rel...The coupling effects among the flow field,temperature distribution and structural deformation in a turbine cannot be ignored,particularly during flight cycles when the turbine experiences varied operational states.Relying solely on steady-state solutions cannot predict the detrimental effects caused by hysteresis.Consequently,this paper employs a quasi-steady-state fluid-thermalstructure multidisciplinary coupling solution method,integrating transient solid heat conduction with steady-state flow field and static structural deformation solutions.After conducting a numerical simulation of a three-dimensional,five-stage,low-pressure turbine air system,the following conclusions are drawn:when boundary conditions attain high-power states through processes that are numerically identical but in opposite directions,slight variations in solid deformation significantly impact the flow field;when boundary conditions attain high-power states through processes that are directionally consistent but have different numerical values,the influence of the boundary condition change rate on the flow field surpasses that of solid deformation.In terms of turbine design parameters,a large difference in stage-reaction between adjacent stages at the lower radius of the turbine can lead to significant changes in the disc cavity flow field during flight cycles.The difference in the stage-reaction of 0.23 at 10%blade height in adjacent stages may induce severe gas ingress in the stator disc cavity.Thus,it is crucial to minimize this difference and to appropriately extend the duration of the deceleration phase to ensure the turbine's safe operation.展开更多
Thermal power plants are the main contributors to greenhouse gas emissions.The prediction of the emission supports the decision makers and environmental sustainability.The objective of this study is to enhance the acc...Thermal power plants are the main contributors to greenhouse gas emissions.The prediction of the emission supports the decision makers and environmental sustainability.The objective of this study is to enhance the accuracy of emission prediction models,supporting more effective real-time monitoring and enabling informed operational decisions that align with environmental compliance efforts.This paper presents a data-driven approach for the accurate prediction of gas emissions,specifically nitrogen oxides(NOx)and carbon monoxide(CO),in natural gas power plants using an optimized hybrid machine learning framework.The proposed model integrates a Feedforward Neural Network(FFNN)trained using Particle Swarm Optimization to capture the nonlinear emission dynamics under varying gas turbine operating conditions.To further enhance predictive performance,the K-Nearest Neighbor(K-NN)algorithm serves as a post-processing method to enhance IPSO-FFNN predictions through adjustment and refinement,improving overall prediction accuracy,while Neighbor Component Analysis is used to identify and rank the most influential operational variables.The study makes a significant contribution through the combination of NCA feature selection with PSO global optimization,FFNN nonlinear modelling,and K-NN error correction into one unified system,which delivers precise emission predictions.The model was developed and tested using a real-world dataset collected from gas-fired turbine operations,with validated results demonstrating robust accuracy,achieving Root Mean Square Error values of 0.355 for CO and 0.368 for NOx.When benchmarked against conventional models such as standard FFNN,Support Vector Regression,and Long Short-Term Memory networks,the hybrid model achieved substantial improvements,up to 97.8%in Mean Squared Error,95%in Mean Absolute Error(MAE),and 85.19%in RMSE for CO;and 97.16%in MSE,93.4%in MAE,and 83.15%in RMSE for NOx.These results underscore the model’s potential for improving emission prediction,thereby supporting enhanced operational efficiency and adherence to environmental standards.展开更多
Stator vanes especially vane suction sides of transonic turbines are subjected to high frequency excitation forces under many circumstances,and thus are exposed to the risk of high cycle fatigue.Therefore,it is necess...Stator vanes especially vane suction sides of transonic turbines are subjected to high frequency excitation forces under many circumstances,and thus are exposed to the risk of high cycle fatigue.Therefore,it is necessary to reveal the flow mechanism of this kind of excitations for potential prevention measures.In this paper,the traveling shock phenomenon in the transonic turbine stator/rotor gap is observed and the concept of‘Inter-Row Traveling Shock(IRTS)'is proposed through the unsteady Reynolds-Averaged Navier-Stokes(RANS)simulation of a typical highlyloaded transonic turbine stage.The characteristics of an IRTS were described and summarized in aspects of unsteady shock wave system,aerodynamic characteristics and motion.The probable forming mechanism of an IRTS was explained through a theoretical model and it was validated through correct prediction of the flow state parameter change across the IRTS.Since IRTSs would strike onto vane suction sides,the pressure oscillation dynamic modes on vane suction side corresponding to the characteristic frequencies associated with IRTS were extracted through Dynamic Mode Decomposition(DMD),from which the way and extent of the IRTS influences on vane aerodynamic excitation were revealed and evaluated.Over 82%pressure oscillation energy on vane suction side could be brought by the IRTS sweeping along with blade rotation.展开更多
The critical components of gas turbines suffer from prolonged exposure to factors such as thermal oxidation,mechanical wear,and airflow disturbances during prolonged operation.These conditions can lead to a series of ...The critical components of gas turbines suffer from prolonged exposure to factors such as thermal oxidation,mechanical wear,and airflow disturbances during prolonged operation.These conditions can lead to a series of issues,including mechanical faults,air path malfunctions,and combustion irregularities.Traditional modelbased approaches face inherent limitations due to their inability to handle nonlinear problems,natural factors,measurement uncertainties,fault coupling,and implementation challenges.The development of artificial intelligence algorithms has provided an effective solution to these issues,sparking extensive research into data-driven fault diagnosis methodologies.The review mechanism involved searching IEEE Xplore,ScienceDirect,and Web of Science for peerreviewed articles published between 2019 and 2025,focusing on multi-fault diagnosis techniques.A total of 220 papers were identified,with 123 meeting the inclusion criteria.This paper provides a comprehensive review of diagnostic methodologies,detailing their operational principles and distinctive features.It analyzes current research hotspots and challenges while forecasting future trends.The study systematically evaluates the strengths and limitations of various fault diagnosis techniques,revealing their practical applicability and constraints through comparative analysis.Furthermore,this paper looks forward to the future development direction of this field and provides a valuable reference for the optimization and development of gas turbine fault diagnosis technology in the future.展开更多
Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in the area’s transformation to a green energy base Siemens Energy,one of the world’s leading energy technology companies,became...Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in the area’s transformation to a green energy base Siemens Energy,one of the world’s leading energy technology companies,became the first foreign-funded manufacturer to establish a branch in Hainan and began construction of a gas turbine assembly base and service centre on 18 December 2025.The historic event took place on the first day of the Hainan Free Trade Port(FTP)’s island-wide special customs operation at the Yangpu Economic Development Zone in Danzhou City,northwest Hainan.展开更多
Deep learning-based wind turbine blade fault diagnosis has been widely applied due to its advantages in end-to-end feature extraction.However,several challenges remain.First,signal noise collected during blade operati...Deep learning-based wind turbine blade fault diagnosis has been widely applied due to its advantages in end-to-end feature extraction.However,several challenges remain.First,signal noise collected during blade operation masks fault features,severely impairing the fault diagnosis performance of deep learning models.Second,current blade fault diagnosis often relies on single-sensor data,resulting in limited monitoring dimensions and ability to comprehensively capture complex fault states.To address these issues,a multi-sensor fusion-based wind turbine blade fault diagnosis method is proposed.Specifically,a CNN-Transformer Coupled Feature Learning Architecture is constructed to enhance the ability to learn complex features under noisy conditions,while a Weight-Aligned Data Fusion Module is designed to comprehensively and effectively utilize multi-sensor fault information.Experimental results of wind turbine blade fault diagnosis under different noise interferences show that higher accuracy is achieved by the proposed method compared to models with single-source data input,enabling comprehensive and effective fault diagnosis.展开更多
Gas Turbines are among the most important energy systems for aviation and thermal-based power generation.The performance of gas turbine intakes with S-shaped diffusers is vulnerable to flow separation,reversal flow,an...Gas Turbines are among the most important energy systems for aviation and thermal-based power generation.The performance of gas turbine intakes with S-shaped diffusers is vulnerable to flow separation,reversal flow,and pressure distortion,mainly in aggressive S-shaped diffusers.Severalmethods,including vortex generators and energy promoters,have been proposed and investigated both experimentally and numerically.This paper compiles a review of experimental investigations that have been performed and reported to mitigate flow separation and restore system performance.The operational principles,classifications,design geometries,and performance parameters of Sshaped diffusers are presented to facilitate the analysis and understanding of the influence of each mitigation method on flowenhancement in S-shaped diffusers.Theinfluencing design parameters on the performance of the S-shaped diffuser and the findings achieved by various experimental investigations are discussed and compared.The review concludes that reducing the intake length reduces the size and weight of the gas turbine,leading to a higher power-to-weight ratio.However,the main challenge in shortening the S-shaped diffusers is the flow separation in the high-curvature section,which must be prevented to maintain high performance.Prevention can be achieved through flow control methods,which are categorized into passive and aggressive methods.The static pressure recovery coefficient,total pressure loss coefficient,ideal static pressure coefficient,distortion coefficient,and skin friction coefficient are the primary performance evaluation and comparison parameters between the experimentally investigated mitigation methods.The new trend in S-shaped diffuser studies includes the integration of computational and data-driven methods.展开更多
A Hybrid Free-Form Deformation(HFFD)method is developed to improve shape preservation in mesh deformation for perforated surfaces,which traditional Free-Form Deformation(FFD)techniques struggle to handle effectively.T...A Hybrid Free-Form Deformation(HFFD)method is developed to improve shape preservation in mesh deformation for perforated surfaces,which traditional Free-Form Deformation(FFD)techniques struggle to handle effectively.The proposed method enables high-fidelity parameterized deformation for both flat and curved perforated surfaces while maintaining mesh quality with minimal geometric distortion.To evaluate its effectiveness,comparative studies between HFFD and conventional FFD methods are conducted,demonstrating superior performance in mesh quality and geometric fidelity.The HFFD-based framework is further applied to the Multidisciplinary Design Optimization(MDO)of a double-wall turbine blade leading edge.Results indicate an 11.6%increase in cooling efficiency and a 16.21%reduction in maximum stress.Additionally,compared to traditional geometry-based parameterization in MDO,the HFFD approach improves model processing efficiency by 84.15%and overall optimization efficiency by20.05%.These findings demonstrate HFFD's potential to significantly improve complex engineering design optimization by achieving precise shape preservation and improving computational efficiency.展开更多
Water-cooled system have significantly enhanced the power generation efficiency of offshore wind turbines.However,these innovative systems are susceptible to substantial biological fouling,maintenance challenges,and h...Water-cooled system have significantly enhanced the power generation efficiency of offshore wind turbines.However,these innovative systems are susceptible to substantial biological fouling,maintenance challenges,and high upkeep costs.Therefore,the development of a specialized front-end filter tailored for direct current water-cooled system is importance.This involves the integration of dimensionally stable anode(DSA)and nickel alloy cathode,valued for their corrosion resistance in seawater,into a novel front-end filter system for Water-cooled applications.This system has the dual capability of generating hydrogen and chlorine for self-cleaning purposes.Implementing a flushing pulse electrolysis mode,it effectively mitigates electrode failure induced by cathodic calcium and magnesium deposition,thereby significantly prolonging electrode lifespan.Laboratory tests comprising system assembly and performance evaluations were conducted,with the system programmed to operate for 5 minutes every 24 hours under continuous flushing by natural seawater to simulate real-world conditions.After more than 11 months of continuous flushing,observations reveal that the DSA mesh and nickel alloy mesh maintain intact structural integrity and normal functioning.Subsequent 1꞉1 physical prototype Sea trial further validated the soundness of the system design and electrolytic control parameters.展开更多
The world’s most powerful offshore wind turbine has begun feeding electricity into the grid off the coast of southeast China,marking a major technological leap in the country’s wind power industry.The colossal turbi...The world’s most powerful offshore wind turbine has begun feeding electricity into the grid off the coast of southeast China,marking a major technological leap in the country’s wind power industry.The colossal turbine,developed and installed by China Three Gorges Corp.(CTG),is located in the Phase II Liuao offshore wind farm,more than 30 km off the coast of Fujian in waters deeper than 40 metres.The 20-mw unit successfully completed commissioning and started operation on 5 February,CTG announced.展开更多
Wind turbine blade defect detection faces persistent challenges in separating small,low-contrast surface faults from complex backgrounds while maintaining reliability under variable illumination and viewpoints.Conven-...Wind turbine blade defect detection faces persistent challenges in separating small,low-contrast surface faults from complex backgrounds while maintaining reliability under variable illumination and viewpoints.Conven-tional image-processing pipelines struggle with scalability and robustness,and recent deep learning methods remain sensitive to class imbalance and acquisition variability.This paper introduces TurbineBladeDetNet,a convolutional architecture combining dual-attention mechanisms with multi-path feature extraction for detecting five distinct blade fault types.Our approach employs both channel-wise and spatial attention modules alongside an Albumentations-driven augmentation strategy to handle dataset imbalance and capture condition variability.The model achieves 97.14%accuracy,98.65%precision,and 98.68%recall,yielding a 98.66%F1-score with 0.0110 s inference time.Class-specific analysis shows uniformly high sensitivity and specificity;lightning damage reaches 99.80%for sensitivity,precision,and F1-score,and crack achieves perfect precision and specificity with a 98.94%F1-score.Comparative evaluation against recent wind-turbine inspection approaches indicates higher performance in both accuracy and F1-score.The resulting balance of sensitivity and specificity limits both missed defects and false alarms,supporting reliable deployment in routine unmanned aerial vehicle(UAV)inspection.展开更多
The real-time and accurate calculation of electricity indirect carbon emissions is not only the critical component for quantifying the carbon emission levels of the power system but also an effective mean to guide ele...The real-time and accurate calculation of electricity indirect carbon emissions is not only the critical component for quantifying the carbon emission levels of the power system but also an effective mean to guide electricity users in carbon reduction and promote power industry low-carbon transformation.Fundamentally,calculating indirect carbon emissions involves allocating direct carbon emission data from the power source side,indicating that accurate indirect emission results rely on the precise measurement of power source emissions.However,existing research on indirect carbon emissions in large-scale power systems rarely accounts for variations in carbon emission characteristics under different operating conditions of power sources,such as rated/non-rated operating conditions and ramping up/down conditions,making it difficult to reflect source-side and load-side carbon emission information variation during providing ancillary services.Quadratic and exponential functions are proposed to characterize the energy consumption profiles of coal-fired and gas-fired power generation,respectively,to construct a refined carbon emission model for power sources.By leveraging the theory of power system carbon flow,we analyze how variable operating conditions of power sources impact indirect carbon emissions.Case studies demonstrate that changes in power source emissions under variable conditions have a significant effect on the indirect carbon emissions of power grids.展开更多
In order to enhance the off-peak performance of gas turbine combined cycle(GTCC)units,a novel collaborative power generation system(CPG)was proposed.During off-peak operation periods,the remaining power of the GTCC wa...In order to enhance the off-peak performance of gas turbine combined cycle(GTCC)units,a novel collaborative power generation system(CPG)was proposed.During off-peak operation periods,the remaining power of the GTCC was used to drive the adiabatic compressed air energy storage(ACAES),while the intake air of the GTCC was heated by the compression heat of theACAES.Based on a 67.3MW GTCC,under specific demand load distribution,a CPG system and a benchmark system(BS)were designed,both of which used 9.388% of the GTCC output power to drive the ACAES.The performance of the CPG and the BS without intake air heating was compared.The results show that the load rate of the GTCC in the CPG system during off-peak periods is significantly enhanced,and the average operating efficiency of the GTCC is increased by 1.19 percentage points.However,in the BS system,due to the single collaborativemethod of load shifting,the GTCC operative efficiency is almost increased by 1.00 percentage points under different ambient temperatures.In a roundtrip cycle at an ambient temperature of 288.15K,the systemefficiency of the CPG reaches 0.5010,which is 0.62 percentage points higher than the operative efficiency of 0.4948 in the standalone GTCC;while the system efficiency of the BS is slightly inferior to that of the standalone GTCC.The findings confirm the technical feasibility and performance improvement of the ACAES-GTCC collaborative power generation system.展开更多
基金funded by grants from the Natural Science Foundation of Hubei Province(No.2022CFB199)the National Natural Science Foundation of China(No.82271127).
文摘Objective The middle turbinate axilla(MTA)is a crucial anatomical landmark for localizing the lacrimal sac(LS)during endonasal dacryocystorhinostomy(En-DCR).Despite being a standard surgical procedure,En-DCR may lead to severe complications,such as cerebrospinal fluid(CSF)leakage,which is closely associated with anatomical variations between the LS and the anterior skull base(ASB).This study aimed to investigate the anatomical location of the LS relative to the MTA and ASB in Chinese patients with nasolacrimal duct obstruction(NLDO)and analyze the influencing factors.Methods This cross-sectional study enrolled 227 Chinese patients who were diagnosed with NLDO and underwent computed tomographic dacryocystography(CT-DCG).Anatomical distances between LS and MTA,as well as LS and ASB,were measured using CT-DCG images.Results The mean distances from the superior and inferior edges of the LS to the MTA were 9.94±4.70 mm and−0.23±4.15 mm,respectively.Male patients showed significantly more superior–anterior displacement of the LS compared to female patients(P<0.001),while patients with chronic dacryocystitis(CD)had an inferior and posterior LS position relative to those with simple NLDO(P=0.005,P=0.001).The mean distance from the intersection(Point P)of the superior and posterior boundaries of the LS to the ASB(MP)was 18.35±4.48 mm,which was shorter in females and those with frontal sinus aplasia(P=0.001;P<0.001).A subgroup(28/227,12.3%)with a critical anatomical feature was identified,where the distance from Point Q(10 mm posterior to P)to the ASB(NQ distance)was≤10 mm.This subgroup had a higher prevalence of complete supra-MTA LS positioning(71.4%vs.41.2%,P=0.003).Conclusion Preoperative CT-DCG provides essential anatomical insights into the spatial relationship between the LS and MTA in Chinese patients with NLDO.The LS position varies significantly by gender and disease type,with males showing more superior–anterior and CD patients more inferior–posterior positioning relative to the MTA.Special attention should be paid to patients with frontal sinus aplasia or LS entirely above the MTA to minimize the risk of CSF leakage during En-DCR.
文摘BACKGROUND Cases of turbinate mucocele or pyogenic mucocele are extremely rare.During nasal endoscopy,turbinate hypertrophy can be detected in patients with turbinate or pyogenic mucocele.However,in many instances,differentiating between turbinate hypertrophy and turbinate mucocele is difficult.Radiological examinations,such as computed tomography(CT)or magnetic resonance imaging(MRI),are essential for the accurate diagnosis of turbinate mucocele.Herein,we report three cases of mucocele or pyogenic mucocele of turbinate,including their clinical presentation,imaging findings,and treatments,to help rhinologists understand this condition better.CASE SUMMARY Three cases of turbinate and pyogenic mucocele were encountered in our hospital.In all patients,nasal obstruction and headache were the most common symptoms,and physical examination revealed hypertrophic turbinates.On CT scan,mucocele appeared as non-enhancing,homogeneous,hypodense,well-defined,rounded,and expansile lesions.Meanwhile,MRI clearly illustrated the cystic nature of the lesion on T2 sequences.Two patients with inferior turbinate mucocele underwent mucocele lining removal,while the patient with pyogenic mucocele underwent endoscopic middle turbinate marsupialization.The patients were followed up on the first,third,sixth month,and 1 year after discharge,and no complaints of headache and nasal congestion were reported during this period.CONCLUSION In conclusion,both CT and MRI are helpful in the diagnosis of turbinate or pyogenic mucocele.Additionally,endoscopic nasal surgery is considered to be the most effective treatment method.
基金Supported by Foundation Project in Guang'anmen Hospital,China Academy of Chinese Medical Sciences:2006 S 195
文摘Objective To explore the feasibility of electroacupuncture compound anesthesia in radiofrequency ablation for hypertrophic inferior turbinate.Methods The patients confirmed to the enrolled criteria were randomly divided into an observation group（n=31） and a control group（n=30）.In the observation group,electroacupuncture was applied to Sìbái（四白 ST 2）,Xiàguān（下关 ST 7）,Hégǔ（合谷 LI 4） and Zhīgōu（支沟 TE 6） on the left side for the anesthesia and the routine local anesthesia was done on the right side.In the control group,the routine local anesthesia was adopted on both sides.The feelings of pain,circulatory index and operation effect were observed and compared between the two groups.Results During radiofrequency ablation,the pain grades of two measurements on the left side and the 2nd measurement on the right in the observation group were all lower than those in the control group（all P〈0.05）.In the observation group,the pain grade on the left side was lower than that on the right side（P〈0.05）,and the systolic blood pressure and the heart rate were lower than those in the control group when undergoing the 2nd radiofrequency ablation on the right side and on the left side,respectively（all P〈0.05）.There was no significant difference in operation effect between the two groups.Conclusion Electroacupuncture compound anesthesia can meet the analgesia requirement of radiofrequency ablation for hypertrophic inferior turbinate,and would be helpful to prevent cyclic fluctuation during the operation at the same time.
基金Supported by the National Research Foundation of Korea Grant funded by the Korea Government(MSIT),No.2020R1A2C1100891Soonchunhyang Research und,No.2023-0048.
文摘BACKGROUND The nasal bone,being the most protruding bone in the center of the facial bones,is particularly susceptible to damage.Nasal bone fractures can often result in secondary deformation and dysfunction of the nose,including septal fractures.Studies on functional or intra-nasal complications have been rarely reported after nasal bone fracture reduction.AIM To evaluate the severity of nasal obstruction and its improvement following nasal bone fracture reduction using inferior turbinoplasty.METHODS We conducted a retrospective review of data from 50 patients with symptomatic nasal obstruction between January to December 2010.All patients underwent preoperative Computed tomography evaluation,and symptom changes and nasal cavity volume were analyzed using a visual analog scale and acoustic rhinometry before and after surgery.Closed reduction and out-fracture of both inferior turbinates performed by the same surgeon.Treatment outcomes were assessed by comparing changes in the nasal airway volume measured using acoustic rhinometry before and after surgery.The minimal cross-sectional area(MCA)was also analyzed based on the Stranc classification.RESULTS Before reduction,the mean MCA for all cases was 0.59±0.06 cm^(2),which represented an 11%decrease compared to the average size of a Korean adult(0.65±0.03 cm^(2)).The MCA for frontal impact was 0.60±0.02 cm^(2) and for lateral impact,it was 0.58±0.03 cm^(2).After reduction via inferior turbinoplasty,the MCA improved to 0.64±0.04 cm^(2).CONCLUSION This study suggests that turbinoplasty is helpful in addressing nasal obstruction.Out-fracture of the inferior turbinate is an effective and durable technique that can be easily performed to enlarge the nasal airway with minimal morbidity.
文摘Mucotomy is one of the most frequently applied surgical techniques for the management of inferior turbinate hyperplasia. Mucotomy guarantees patent airway, however, it might lead to the emergence of sicca syndrome. In contrast, KTP (potassium titanyl phosphate) laser treatment spares the medial part of the inferior turbinate mucosa, contributing to maintenance of physiological nasal function. A retrospective comparative clinical study was performed to reveal the advantages and side-effects of both surgical methods in medium- and long-term in allergic rhinitis and non-allergic patients. Furthermore, we wished to determine the exact indications of the up-to-date laser treatment. Ninety-one of the 117 patients who underwent bilateral turbinate surgery during an 8-year period (2000-2007) responded to our questionnaire focusing on subjective postoperative changes. Patients were separated into 6 groups, based on the type of operation they underwent, the length of the follow-up and whether they suffered from allergies. The major complaint, nasal obstruction, improved in all 6 groups, which reached significance (p ? 0.05) in 4 groups. The most pronounced improvement was observed in the group of non-allergic patients with medium-term follow-up who underwent mucotomy. Nevertheless, a serious side- effect: crusting also increased significantly (p ? 0.05) in the latter group, while it was absent in allergic patients with medium-term follow-up, who underwent mucotomy. These results lead us to propose the following protocol for the treatment of inferior turbinate hyperplasia: 1) after unsuccessful conservative treatment, laser treatment is suggested for non-allergic patients;2) following unsuccessful conservative and even repeated laser treatment in the allergic group, mucotomy or turbinoplasty should be attempted.
文摘Objective:Nasal packing is routinely applied after septoplasty.Patients,however,report feeling very uncomfortable while the packing is in place.The aim of this study was to compare the effects of nasal septum suture combined with inferior turbinate coblation to the effects of nasal packing after septoplasty.Methods:In this study,135 patients undergoing septoplasty were divided into 3 groups:group 1 patients had microdebrider with packing,group 2 received coblation with packing and group 3 had coblation with suture.Early postoperative quality of life and complications were compared between the 3 groups.Results:The patients in group 1 experienced the most postoperative nasal pain,headache,dysphagia,sleep disturbance and bleeding on the night of surgery;while the patients in group 3 experienced the fewest symptoms.No difference in epiphora was observed between the 3 groups.More pain and bleeding were experienced when comparing the pack removal (Group 1 and 2) with the clearance of the nasal cavity (Group 3).We noted one case of postoperative bleeding in group 1,one septal hematoma in group 1 and a second septal hematoma in group 2.No such postoperative complications were found in group 3.Conclusion:Nasal septum suture combined with inferior turbinate coblation was not only associated with less pain,increased patient satisfaction and an improved quality of life;but also reduced postoperative complications.Our results confirm that it is a more comfortable,reliable alternative to the more common nasal packing.
文摘Objectives:Resection of the middle turbinate(MT)during endoscopic sinus surgery(ESS)has been a controversial topic among otolaryngologists for many years.Some studies advocate resection and have shown improved outcomes postoperatively,while studies favoring preservation show a decreased incidence of postoperative complications.The current practice pattern regarding this subject is unknown.The goal of this study was to learn the current practice of MT resection during ESS among otolaryngologists.Method:We performed an electronic anonymous survey of practicing otolaryngologists.Results:We found that the majority of the 252 responders stated that they will perform an MT resection in certain clinical situations,while there is a small subset that advocates never resecting the MT for inflammatory sinus disease(n=6,2.4%).Participants were significantly more likely to perform MT resection in patients undergoing revision compared to primary ESS for all conditions included.The complication of greatest concern among participants was iatrogenic frontal sinus obstruction,while empty nose was of the least concern.The majority of participants responded that MT resection was of extreme or moderate benefit for improved visualization and drug delivery postoperatively.When compared to general otolaryngologists,fellowship-trained rhinologists were less concerned about potential complications following MT resection and were more likely to perceive an extreme or moderate benefit from turbinate resection postoperatively.Conclusion:There remains debate over MT resection among otolaryngologists,but the results of this study show that the majority of participating otolaryngologists will perform a resection in certain clinical situations.
基金supported by the National Science and Tech-nology Major Project,China(No.J2019-II-0012-0032)。
文摘The coupling effects among the flow field,temperature distribution and structural deformation in a turbine cannot be ignored,particularly during flight cycles when the turbine experiences varied operational states.Relying solely on steady-state solutions cannot predict the detrimental effects caused by hysteresis.Consequently,this paper employs a quasi-steady-state fluid-thermalstructure multidisciplinary coupling solution method,integrating transient solid heat conduction with steady-state flow field and static structural deformation solutions.After conducting a numerical simulation of a three-dimensional,five-stage,low-pressure turbine air system,the following conclusions are drawn:when boundary conditions attain high-power states through processes that are numerically identical but in opposite directions,slight variations in solid deformation significantly impact the flow field;when boundary conditions attain high-power states through processes that are directionally consistent but have different numerical values,the influence of the boundary condition change rate on the flow field surpasses that of solid deformation.In terms of turbine design parameters,a large difference in stage-reaction between adjacent stages at the lower radius of the turbine can lead to significant changes in the disc cavity flow field during flight cycles.The difference in the stage-reaction of 0.23 at 10%blade height in adjacent stages may induce severe gas ingress in the stator disc cavity.Thus,it is crucial to minimize this difference and to appropriately extend the duration of the deceleration phase to ensure the turbine's safe operation.
文摘Thermal power plants are the main contributors to greenhouse gas emissions.The prediction of the emission supports the decision makers and environmental sustainability.The objective of this study is to enhance the accuracy of emission prediction models,supporting more effective real-time monitoring and enabling informed operational decisions that align with environmental compliance efforts.This paper presents a data-driven approach for the accurate prediction of gas emissions,specifically nitrogen oxides(NOx)and carbon monoxide(CO),in natural gas power plants using an optimized hybrid machine learning framework.The proposed model integrates a Feedforward Neural Network(FFNN)trained using Particle Swarm Optimization to capture the nonlinear emission dynamics under varying gas turbine operating conditions.To further enhance predictive performance,the K-Nearest Neighbor(K-NN)algorithm serves as a post-processing method to enhance IPSO-FFNN predictions through adjustment and refinement,improving overall prediction accuracy,while Neighbor Component Analysis is used to identify and rank the most influential operational variables.The study makes a significant contribution through the combination of NCA feature selection with PSO global optimization,FFNN nonlinear modelling,and K-NN error correction into one unified system,which delivers precise emission predictions.The model was developed and tested using a real-world dataset collected from gas-fired turbine operations,with validated results demonstrating robust accuracy,achieving Root Mean Square Error values of 0.355 for CO and 0.368 for NOx.When benchmarked against conventional models such as standard FFNN,Support Vector Regression,and Long Short-Term Memory networks,the hybrid model achieved substantial improvements,up to 97.8%in Mean Squared Error,95%in Mean Absolute Error(MAE),and 85.19%in RMSE for CO;and 97.16%in MSE,93.4%in MAE,and 83.15%in RMSE for NOx.These results underscore the model’s potential for improving emission prediction,thereby supporting enhanced operational efficiency and adherence to environmental standards.
文摘Stator vanes especially vane suction sides of transonic turbines are subjected to high frequency excitation forces under many circumstances,and thus are exposed to the risk of high cycle fatigue.Therefore,it is necessary to reveal the flow mechanism of this kind of excitations for potential prevention measures.In this paper,the traveling shock phenomenon in the transonic turbine stator/rotor gap is observed and the concept of‘Inter-Row Traveling Shock(IRTS)'is proposed through the unsteady Reynolds-Averaged Navier-Stokes(RANS)simulation of a typical highlyloaded transonic turbine stage.The characteristics of an IRTS were described and summarized in aspects of unsteady shock wave system,aerodynamic characteristics and motion.The probable forming mechanism of an IRTS was explained through a theoretical model and it was validated through correct prediction of the flow state parameter change across the IRTS.Since IRTSs would strike onto vane suction sides,the pressure oscillation dynamic modes on vane suction side corresponding to the characteristic frequencies associated with IRTS were extracted through Dynamic Mode Decomposition(DMD),from which the way and extent of the IRTS influences on vane aerodynamic excitation were revealed and evaluated.Over 82%pressure oscillation energy on vane suction side could be brought by the IRTS sweeping along with blade rotation.
基金funded by the Science and Technology Vice President Project in Changping District,Beijing(Project Name:Research on multi-scale optimization and intelligent control technology of integrated energy systemProject number:202302007013).
文摘The critical components of gas turbines suffer from prolonged exposure to factors such as thermal oxidation,mechanical wear,and airflow disturbances during prolonged operation.These conditions can lead to a series of issues,including mechanical faults,air path malfunctions,and combustion irregularities.Traditional modelbased approaches face inherent limitations due to their inability to handle nonlinear problems,natural factors,measurement uncertainties,fault coupling,and implementation challenges.The development of artificial intelligence algorithms has provided an effective solution to these issues,sparking extensive research into data-driven fault diagnosis methodologies.The review mechanism involved searching IEEE Xplore,ScienceDirect,and Web of Science for peerreviewed articles published between 2019 and 2025,focusing on multi-fault diagnosis techniques.A total of 220 papers were identified,with 123 meeting the inclusion criteria.This paper provides a comprehensive review of diagnostic methodologies,detailing their operational principles and distinctive features.It analyzes current research hotspots and challenges while forecasting future trends.The study systematically evaluates the strengths and limitations of various fault diagnosis techniques,revealing their practical applicability and constraints through comparative analysis.Furthermore,this paper looks forward to the future development direction of this field and provides a valuable reference for the optimization and development of gas turbine fault diagnosis technology in the future.
文摘Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in the area’s transformation to a green energy base Siemens Energy,one of the world’s leading energy technology companies,became the first foreign-funded manufacturer to establish a branch in Hainan and began construction of a gas turbine assembly base and service centre on 18 December 2025.The historic event took place on the first day of the Hainan Free Trade Port(FTP)’s island-wide special customs operation at the Yangpu Economic Development Zone in Danzhou City,northwest Hainan.
基金supported by the China Three Gorges Corporation(No.NBZZ202300860)the National Natural Science Foundation of China(No.52275104)the Science and Technology Innovation Program of Hunan Province(No.2023RC3097).
文摘Deep learning-based wind turbine blade fault diagnosis has been widely applied due to its advantages in end-to-end feature extraction.However,several challenges remain.First,signal noise collected during blade operation masks fault features,severely impairing the fault diagnosis performance of deep learning models.Second,current blade fault diagnosis often relies on single-sensor data,resulting in limited monitoring dimensions and ability to comprehensively capture complex fault states.To address these issues,a multi-sensor fusion-based wind turbine blade fault diagnosis method is proposed.Specifically,a CNN-Transformer Coupled Feature Learning Architecture is constructed to enhance the ability to learn complex features under noisy conditions,while a Weight-Aligned Data Fusion Module is designed to comprehensively and effectively utilize multi-sensor fault information.Experimental results of wind turbine blade fault diagnosis under different noise interferences show that higher accuracy is achieved by the proposed method compared to models with single-source data input,enabling comprehensive and effective fault diagnosis.
文摘Gas Turbines are among the most important energy systems for aviation and thermal-based power generation.The performance of gas turbine intakes with S-shaped diffusers is vulnerable to flow separation,reversal flow,and pressure distortion,mainly in aggressive S-shaped diffusers.Severalmethods,including vortex generators and energy promoters,have been proposed and investigated both experimentally and numerically.This paper compiles a review of experimental investigations that have been performed and reported to mitigate flow separation and restore system performance.The operational principles,classifications,design geometries,and performance parameters of Sshaped diffusers are presented to facilitate the analysis and understanding of the influence of each mitigation method on flowenhancement in S-shaped diffusers.Theinfluencing design parameters on the performance of the S-shaped diffuser and the findings achieved by various experimental investigations are discussed and compared.The review concludes that reducing the intake length reduces the size and weight of the gas turbine,leading to a higher power-to-weight ratio.However,the main challenge in shortening the S-shaped diffusers is the flow separation in the high-curvature section,which must be prevented to maintain high performance.Prevention can be achieved through flow control methods,which are categorized into passive and aggressive methods.The static pressure recovery coefficient,total pressure loss coefficient,ideal static pressure coefficient,distortion coefficient,and skin friction coefficient are the primary performance evaluation and comparison parameters between the experimentally investigated mitigation methods.The new trend in S-shaped diffuser studies includes the integration of computational and data-driven methods.
基金supported by the National Science and Technology Major Project,China(No.2017-II-0006-0019)the National Natural Science Foundation of China(No.52375266)the Shaanxi Science Foundation for Distinguished Young Scholars,China(No.2022JC-36)。
文摘A Hybrid Free-Form Deformation(HFFD)method is developed to improve shape preservation in mesh deformation for perforated surfaces,which traditional Free-Form Deformation(FFD)techniques struggle to handle effectively.The proposed method enables high-fidelity parameterized deformation for both flat and curved perforated surfaces while maintaining mesh quality with minimal geometric distortion.To evaluate its effectiveness,comparative studies between HFFD and conventional FFD methods are conducted,demonstrating superior performance in mesh quality and geometric fidelity.The HFFD-based framework is further applied to the Multidisciplinary Design Optimization(MDO)of a double-wall turbine blade leading edge.Results indicate an 11.6%increase in cooling efficiency and a 16.21%reduction in maximum stress.Additionally,compared to traditional geometry-based parameterization in MDO,the HFFD approach improves model processing efficiency by 84.15%and overall optimization efficiency by20.05%.These findings demonstrate HFFD's potential to significantly improve complex engineering design optimization by achieving precise shape preservation and improving computational efficiency.
基金Supported by the Project of Design of Anti-corrosion and Anti-fouling Solutions for Offshore Wind Power Water-Cooled Systems(No.E428161)the National Natural Science Foundation of China(No.42176047)。
文摘Water-cooled system have significantly enhanced the power generation efficiency of offshore wind turbines.However,these innovative systems are susceptible to substantial biological fouling,maintenance challenges,and high upkeep costs.Therefore,the development of a specialized front-end filter tailored for direct current water-cooled system is importance.This involves the integration of dimensionally stable anode(DSA)and nickel alloy cathode,valued for their corrosion resistance in seawater,into a novel front-end filter system for Water-cooled applications.This system has the dual capability of generating hydrogen and chlorine for self-cleaning purposes.Implementing a flushing pulse electrolysis mode,it effectively mitigates electrode failure induced by cathodic calcium and magnesium deposition,thereby significantly prolonging electrode lifespan.Laboratory tests comprising system assembly and performance evaluations were conducted,with the system programmed to operate for 5 minutes every 24 hours under continuous flushing by natural seawater to simulate real-world conditions.After more than 11 months of continuous flushing,observations reveal that the DSA mesh and nickel alloy mesh maintain intact structural integrity and normal functioning.Subsequent 1꞉1 physical prototype Sea trial further validated the soundness of the system design and electrolytic control parameters.
文摘The world’s most powerful offshore wind turbine has begun feeding electricity into the grid off the coast of southeast China,marking a major technological leap in the country’s wind power industry.The colossal turbine,developed and installed by China Three Gorges Corp.(CTG),is located in the Phase II Liuao offshore wind farm,more than 30 km off the coast of Fujian in waters deeper than 40 metres.The 20-mw unit successfully completed commissioning and started operation on 5 February,CTG announced.
文摘Wind turbine blade defect detection faces persistent challenges in separating small,low-contrast surface faults from complex backgrounds while maintaining reliability under variable illumination and viewpoints.Conven-tional image-processing pipelines struggle with scalability and robustness,and recent deep learning methods remain sensitive to class imbalance and acquisition variability.This paper introduces TurbineBladeDetNet,a convolutional architecture combining dual-attention mechanisms with multi-path feature extraction for detecting five distinct blade fault types.Our approach employs both channel-wise and spatial attention modules alongside an Albumentations-driven augmentation strategy to handle dataset imbalance and capture condition variability.The model achieves 97.14%accuracy,98.65%precision,and 98.68%recall,yielding a 98.66%F1-score with 0.0110 s inference time.Class-specific analysis shows uniformly high sensitivity and specificity;lightning damage reaches 99.80%for sensitivity,precision,and F1-score,and crack achieves perfect precision and specificity with a 98.94%F1-score.Comparative evaluation against recent wind-turbine inspection approaches indicates higher performance in both accuracy and F1-score.The resulting balance of sensitivity and specificity limits both missed defects and false alarms,supporting reliable deployment in routine unmanned aerial vehicle(UAV)inspection.
基金supported by the Science and Technology Project of China Southern Power Grid Co.,Ltd.(ZBKTM20232244)the Project of National Natural of Science Foundation of China(52477103).
文摘The real-time and accurate calculation of electricity indirect carbon emissions is not only the critical component for quantifying the carbon emission levels of the power system but also an effective mean to guide electricity users in carbon reduction and promote power industry low-carbon transformation.Fundamentally,calculating indirect carbon emissions involves allocating direct carbon emission data from the power source side,indicating that accurate indirect emission results rely on the precise measurement of power source emissions.However,existing research on indirect carbon emissions in large-scale power systems rarely accounts for variations in carbon emission characteristics under different operating conditions of power sources,such as rated/non-rated operating conditions and ramping up/down conditions,making it difficult to reflect source-side and load-side carbon emission information variation during providing ancillary services.Quadratic and exponential functions are proposed to characterize the energy consumption profiles of coal-fired and gas-fired power generation,respectively,to construct a refined carbon emission model for power sources.By leveraging the theory of power system carbon flow,we analyze how variable operating conditions of power sources impact indirect carbon emissions.Case studies demonstrate that changes in power source emissions under variable conditions have a significant effect on the indirect carbon emissions of power grids.
文摘In order to enhance the off-peak performance of gas turbine combined cycle(GTCC)units,a novel collaborative power generation system(CPG)was proposed.During off-peak operation periods,the remaining power of the GTCC was used to drive the adiabatic compressed air energy storage(ACAES),while the intake air of the GTCC was heated by the compression heat of theACAES.Based on a 67.3MW GTCC,under specific demand load distribution,a CPG system and a benchmark system(BS)were designed,both of which used 9.388% of the GTCC output power to drive the ACAES.The performance of the CPG and the BS without intake air heating was compared.The results show that the load rate of the GTCC in the CPG system during off-peak periods is significantly enhanced,and the average operating efficiency of the GTCC is increased by 1.19 percentage points.However,in the BS system,due to the single collaborativemethod of load shifting,the GTCC operative efficiency is almost increased by 1.00 percentage points under different ambient temperatures.In a roundtrip cycle at an ambient temperature of 288.15K,the systemefficiency of the CPG reaches 0.5010,which is 0.62 percentage points higher than the operative efficiency of 0.4948 in the standalone GTCC;while the system efficiency of the BS is slightly inferior to that of the standalone GTCC.The findings confirm the technical feasibility and performance improvement of the ACAES-GTCC collaborative power generation system.
