AIM: To describe the en bloc perfluorodissection(EBPD) technique and to demonstrate the applicabilityof using preoperative intravitreal bevacizumab duringsmall-gauge vitreoretinal surgery(23-gauge transconjunctival su...AIM: To describe the en bloc perfluorodissection(EBPD) technique and to demonstrate the applicabilityof using preoperative intravitreal bevacizumab duringsmall-gauge vitreoretinal surgery(23-gauge transconjunctival sutureless vitrectomy) in eyes with advancedproliferative diabetic retinopathy(PDR) with tractionalretinal detachment(TRD).METHODS: This is a prospective, interventional caseseries. Participants included 114(eyes) with advancedproliferative diabetic retinopathy and TRD. EBPD wasperformed in 114 eyes(consecutive patients) during23-gauge vitrectomy with the utilization of preoperativebevacizumab(1.25 mg/-0.05 mL). Patients mean age was 45 years(range, 21-85 years). Surgical time had a mean of 55 min(Range, 25-85 min). Mean follow up of this group of patients was 24 mo(range, 12-32 mo). Main outcome measures included best-corrected visual acuity(BCVA), retinal reattachment, and complications.RESULTS: Anatomic success occurred in 100%(114/-114) of eyes. Significant visual improvement [≥ 2 Early Treatment Diabetic Retinopathy Study(ETDRS) lines] was obtained in 69.2%(79/-114), in 26 eyes(22.8%) BCVA remained stable, and in 8 eyes(7%) BCVA decreased(≥ 2 ETDRS lines). Final BCVA was 20/-50 or better in 24% of eyes, between 20/-60 and 20/-400 in 46% of eyes, and worse than 20/-400 in 30% of eyes. Complications included cataract in 32(28%) eyes, iatrogenic retinal breaks in 9(7.8%) eyes, vitreous hemorrhage requiring another procedure in 7(6.1%) eyes, and phthisis bulbi in 1(0.9%) eye.CONCLUSION: This study demonstrates the usefulne-ss of using preoperative intravitreal bevacizumab and EBPD during smallgauge vitreoretinal surgery in eyes with TRD in PDR.展开更多
AIM:To evaluate the outcomes of pars plana vitrectomy(PPV) without the use of an ocular tamponade in patients having tractional retinal detachment(TRD) secondary to proliferative diabetic retinopathy(PDR).METHODS:It w...AIM:To evaluate the outcomes of pars plana vitrectomy(PPV) without the use of an ocular tamponade in patients having tractional retinal detachment(TRD) secondary to proliferative diabetic retinopathy(PDR).METHODS:It was an interventional study conducted at the Department of Ophthalmology,B.V.Hospital,Bahawalpur,Pakistan,from July 2011 to July 2012.A total of 75 patients(84 eyes) having TRD secondary to PDR were treated by PPV without using an ocular tamponade.All patients included in the study had a tractional retinal detachement secondary to proliferative diabetic retinopathy but didn’t have or develop retinal breaks before or during the study period.The surgical procedure included a PPV combined with the removal of the tractional retinal membranes and the application of endolaser photocoagulation to the retina.The mean follow-up period was 12 months. RESULTS:Successful retinal reattachement was observed in 78 of the operated eyes(92.8%).In these patients,the retina remained attached till the end of the one year follow-up period.Improvement in best corrected visual acuity(BCVA) was seen in 63 eyes(75%).The visual acuity remained unchanged in 9 eyes(10.7%).Mean improvement in BCVA was 2.00 +1.24 at baseline to 1.24+1.22(P【0.05) at the end of the followup period.CONCLUSION:In the absence of the retinal breaks,a TRD secondary to PDR can be successfully treated by pars plana vitrectomy without the use of an ocular tamponade.展开更多
The dynamic characteristics of the track system can directly affect its service performance and failure process.To explore the load characteristics and dynamic response of the track system under the dynamic loads from...The dynamic characteristics of the track system can directly affect its service performance and failure process.To explore the load characteristics and dynamic response of the track system under the dynamic loads from the rack vehicle in traction conditions,a systematic test of the track subsystem was carried out on a large-slope test line.In the test,the bending stress of the rack teeth,the wheel-rail forces,and the acceleration of crucial components in the track system were measured.Subsequently,a detailed analysis was conducted on the tested signals of the rack railway track system in the time domain and the time-frequency domains.The test results indicate that the traction force significantly affects the rack tooth bending stress and the wheel-rail forces.The vibrations of the track system under the traction conditions are mainly caused by the impacts generated from the gear-rack engagement,which are then transferred to the sleepers,the rails,and the ballast beds.Furthermore,both the maximum stress on the racks and the wheel-rail forces measured on the rails remain below their allowable values.This experimental study evaluates the load characteristics and reveals the vibration characteristics of the rack railway track system under the vehicle’s ultimate load,which is very important for the load-strengthening design of the key components such as racks and the vibration and noise reduction of the track system.展开更多
Switched Reluctance Motors(SRMs),outfitted with rugged construction,good speed range,high torque density,and rare earth-free nature that outweigh induction motors(IM)and permanent magnet synchronous motor(PMSM),afford...Switched Reluctance Motors(SRMs),outfitted with rugged construction,good speed range,high torque density,and rare earth-free nature that outweigh induction motors(IM)and permanent magnet synchronous motor(PMSM),afford a broad range of applications in the domain of electric vehicles(EVs).Standard copper magnetic wire and low-carbon steel laminations are used to construct SRMs,which give them high efficiency in the range of 85-95%.Despite SRM's desirable features over traditional motor-speed drives,high torque ripples and radial distortions constrain their deployment in EVs.Precise rotor position is imperative for effective management of the speed and torque of SRMs.This paper provides an illustrative compendium on review of the torque-speed control and ripple mitigation techniques using design enhancements and control methods for SRM drives for EV applications.The various schemes were evaluated on their performance metricsoperational speed range,control complexity,practical realization,need for pre-stored parameters(look-up tables of current,inductance and torque profiles)and motor controller memory requirements.The findings provide valuable insights into balancing the gains and trade-offs associated with EV applications.Furthermore,they pinpoint opportunities for enhancement by analyzing the cost and technical aspects of different SRM controllers.展开更多
[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Me...[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Methods]Seventy LDH patients treated at the orthopedic rehabilitation outpatient and inpatient departments of Shiyan Taihe Hospital from June 2022 to December 2024 were randomly divided into a treatment group(CFT therapy,n=35)and a control group(traditional traction,n=35).The treatment group received cyclic flexion traction(traction force of 30%-50%body weight with a cycle of 60-30-30 sec),while the control group received supine position linear traction.Both groups underwent 4 weeks of treatment,with assessments including visual analog scale(VAS),Oswestry Disability Index(ODI),and straight leg raising test(SLRT)angles.[Results]The treatment group showed a significantly greater reduction in VAS scores(from 6.97 to 2.31)compared to the control group(from 6.89 to 3.74)(P<0.05).Similarly,ODI improvement(41.62→15.73 compared with 40.98→22.84)and SLRT angle increase(41.23°→76.47°compared with 42.09°→64.19°)were more pronounced in the treatment group(all P<0.05).[Conclusions]Through dynamic decompression mechanisms,CFT therapy demonstrates superior efficacy to traditional traction in pain relief,functional recovery,and nerve root decompression(effective rate 94.29%compared with 77.14%,P<0.05),representing a superior non-surgical treatment option.展开更多
Replacing the energy density and convenience of diesel fuel for all forms of fossil fuel-powered trains presents significant challenges.Unlike the traditional evolutions of rail which has largely self-optimised to dif...Replacing the energy density and convenience of diesel fuel for all forms of fossil fuel-powered trains presents significant challenges.Unlike the traditional evolutions of rail which has largely self-optimised to different fuels and cost structures over 150 years,the challenges now present with a timeline of just a few decades.Fortunately,unlike the mid-1800s,simulation and modelling tools are now quite advanced and a full range of scenarios of operations and train trips can be simulated before new traction systems are designed.Full trip simulations of large heavy haul trains or high speed passenger trains are routinely completed controlled by emulations of human drivers or automated control systems providing controls of the“virtual train”.Recent developments in digital twins can be used to develop flexible and dynamic models of passenger and freight rail systems to support the new complexities of decarbonisation efforts.Interactions between many different traction components and the train multibody system can be considered as a system of systems.Adopting this multi-modelling paradigm enables the secure and integrated interfacing of diverse models.This paper demonstrates the application of the multi-modelling approach to develop digital twins for rail decarbonisation traction and it presents physics-based multi-models that include key components required for studying rail decarbonisation problems.Specifically,the challenge of evaluating zero-emission options is addressed by adding further layers of modelling to the existing fully detailed multibody dynamics simulations.The additional layers detail control options,energy storage,the alternate traction system components and energy management systems.These traction system components may include both electrical system and inertia dynamics models to accurately represent the driveline and control systems.This paper presents case study examples of full trip scenarios of both long haul freight trains and higher speed passenger trains.These results demonstrate the many complex scenarios that are difficult to anticipate.Flowing on from this,risks can be assessed and practical designs of zero-emission systems can be proposed along with the required recharging or refuelling systems.展开更多
Vascular smooth muscle cells (VSMCs) in the arterial walls play important roles in regulating vascular contraction and dilation. VSMCs actively remodel the arterial walls and dedifferentiate from the contractile to th...Vascular smooth muscle cells (VSMCs) in the arterial walls play important roles in regulating vascular contraction and dilation. VSMCs actively remodel the arterial walls and dedifferentiate from the contractile to the synthetic phenotype under pathological conditions. The mechanism underlying phenotypic transition of VSMCs is important for understanding its role in the pathophysiology of disease. Although numerous studies have reported various biochemical pathways that stimulate the phenotypic transition of VSMCs, very little is known about relation between their phenotypic transition and cellular traction force, which affects many cellular functions. In this study, we induced the differentiation of cultured VSMCs from the synthetic to the contractile phenotype by a low-serum cultivation and investigated changes in the cell traction forces using traction force microscopy technique. The expression of α-SMA, a contractile phenotype marker protein, was significantly upregulated with maturation of actin stress fibers in the low-serum culture, indicating VSMC differentiation was promoted in our experiments. The cells changed their morphology to an elongated bipolar shape, and the direction of the cell traction forces tended to align in the direction of the cell’s major axis. Despite the promotion of contractile differentiation in VSMCs, the overall cell traction forces were significantly reduced, indicating that excessive cell mechanical tension, which might induce cell proliferation and migration, was suppressed during contractile differentiation. These results suggest that suppression of cell traction force and enhanced force polarity might be key factors in VSMC differentiation induced by low serum culture.展开更多
BACKGROUND Developmental dysplasia of the hip(DDH)remains a significant public health challenge,particularly in developing countries where cultural factors and limited access to appropriate medical equipment complicat...BACKGROUND Developmental dysplasia of the hip(DDH)remains a significant public health challenge,particularly in developing countries where cultural factors and limited access to appropriate medical equipment complicate optimal management.AIM To evaluate the difficulties encountered in the management of DDH in our healthcare setting.METHODS A retrospective,single-center study was conducted over nine years(2015-2023),including 20 patients(26 hips)with idiopathic DDH.Patients with post-traumatic or post-infectious hip dislocations were excluded.Data collected included age at diagnosis,laterality,Tönnis classification,duration of traction,and surgical interventions.RESULTS The mean age at diagnosis was 35.6 months(4 months to 10.8 years).Dislocation was unilateral in 70%of cases;69.2%were classified as Tönnis stage 3 or 4.The average traction duration was 57.5 days.Surgery was performed in 8 hips.Among 16 patients with regular follow-up,10 showed good outcomes,3 excellent,and 3 fair according to the McKay score.Older age at treatment(>1 year),bilateral dislocation,and higher severity(Tönnis stages 3 and 4)were associated with worse functional outcomes.No significant correlation was found between functional and radiological results.Residual dysplasia occurred in 3 patients,and 1 re-dislocation was noted.CONCLUSION Delayed diagnosis and advanced severity at presentation are key challenges in managing DDH in our context.Nevertheless,appropriate management can achieve generally favorable outcomes,despite complications linked to prolonged treatment and resource limitations.展开更多
Travel broadens the mind.And now travelers can broaden their minds by exploring the amazing geographical,cultural and culinary diversity that China offers,facilitated by the new visa-free transit policy.With visitors ...Travel broadens the mind.And now travelers can broaden their minds by exploring the amazing geographical,cultural and culinary diversity that China offers,facilitated by the new visa-free transit policy.With visitors from 54 countries now able to stay in China for 10 days in transit without a visa and travel further in the country,“China travel”has gained new traction.展开更多
New stationary power storage cabinets have been set up beside the parking lots of the Green Eco Manufacture(GEM)Industrial Park in Wuhan,Hubei Province,to charge electric vehicles(EVs).Each cabinet contains five modul...New stationary power storage cabinets have been set up beside the parking lots of the Green Eco Manufacture(GEM)Industrial Park in Wuhan,Hubei Province,to charge electric vehicles(EVs).Each cabinet contains five modules of used traction batteries that can be used for eight to 10 years before they need to be replaced.These traction batteries are full of precious metals like lithium,cobalt and nickel.They’re what is often called the“power core”of EVs.展开更多
A detailed comparative examination of the Weibull and Gaussian statistical methods is offered to analyze the mechanical properties of natural date palm fibers. Tensile tests were conducted on 35 fiber samples using a ...A detailed comparative examination of the Weibull and Gaussian statistical methods is offered to analyze the mechanical properties of natural date palm fibers. Tensile tests were conducted on 35 fiber samples using a universal testing machine to gather data on stress, strain, and Young's modulus. This data was then analyzed through both statistical approaches to evaluate their ability to model important mechanical characteristics, including tensile strength, strain at break, and Young's modulus. The study identifies the strengths and weaknesses of each statistical method when it is applied to natural fibers, emphasizing their suitability for modeling different mechanical properties. The results of this analysis provide important insights that can guide the selection of the most appropriate statistical method, depending on the type of mechanical property being studied and the specific characteristics of the data. This research makes significant contributions to advancing the understanding of natural fiber mechanics and improving the methods used for their characterization.展开更多
AIM:To investigate the outcomes and prognosis of macular epiretinal membrane(ERM)after pars plana vitrectomy(PPV)in patients with high myopia(HM),focusing on the optimal timing of surgery and its impact on prognosis.M...AIM:To investigate the outcomes and prognosis of macular epiretinal membrane(ERM)after pars plana vitrectomy(PPV)in patients with high myopia(HM),focusing on the optimal timing of surgery and its impact on prognosis.METHODS:The clinical data of 50 eyes from 49 patients diagnosed with ERM,who were highly myopic and underwent PPV were retrospectively analyzed.The patients with ERM were classified into five groups based on the characteristics associated with different levels of myopic traction maculopathy.Group 1:Simple ERM without complex vertical and tangential direction traction on retina on optical coherence tomography(OCT)image;Group 2:ERM with obvious macular foveal schisis,without macular hole(MH);Group 3:ERM with inner lamellar MH,with or without macular foveal schisis;Group 4:ERM with outer lamellar MH,with or without foveal retinal detachment(RD);Group 5:ERM with full-thickness MH.Baseline characteristics,changes in best corrected visual acuity(BCVA)before and after surgery,and anatomical characteristics through spectral domain OCT were compared.RESULTS:The 50 eyes were followed for 6mo,with an average age of 58.66y and an average axial length(AL)of 28.69 mm.Among the five groups,postoperative logMAR BCVA improved(P<0.05).Group 1 had better mean BCVA at baseline(0.59±0.36)and at 6mo postoperatively(0.16±0.22)compared to the other groups,while Group 5 had worse mean BCVA at baseline(1.68±0.45)and at 6mo postoperatively(1.27±0.64).There were no statistically significant differences in sex,age or AL between the groups(P>0.05).OCT showed that Groups 4 and 5 exhibited poorer macular anatomy compared to the other three groups,as evidenced by lower rates of central retinal reattachment(64.3%in Group 4,86.7%in Group 5)and integrity of the inner segment/outer segment of photoreceptor junction(28.6%in Group 4,26.7%in Group 5).CONCLUSION:PPV is an effective treatment for ERM in patients with HM.All groups showed postoperative improvement in BCVA compared to preoperative levels,demonstrating the necessity of surgical intervention.Early intervention,particularly before the fourth stage of the disease,may lead to better visual outcomes.展开更多
The identification of the traction acting on a portion of the surface of an anisotropic solid is very important in structural health monitoring and optimal design of structures. The traction can be determined using in...The identification of the traction acting on a portion of the surface of an anisotropic solid is very important in structural health monitoring and optimal design of structures. The traction can be determined using inverse methods in which displacement or strain measurements are taken at several points on the body. This paper presents an inverse method based on the method of fundamental solutions for the traction identification problem in two-dimensional anisotropic elasticity. The method of fundamental solutions is an efficient boundary-type meshless method widely used for analyzing various problems. Since the problem is linear, the sensitivity analysis is simply performed by solving the corresponding direct problem several times with different loads. The effects of important parameters such as the number of measurement data, the position of the measurement points, the amount of measurement error, and the type of measurement, i.e., displacement or strain, on the results are also investigated. The results obtained show that the presented inverse method is suitable for the problem of traction identification. It can be concluded from the results that the use of strain measurements in the inverse analysis leads to more accurate results than the use of displacement measurements. It is also found that measurement points closer to the boundary with unknown traction provide more reliable solutions. Additionally, it is found that increasing the number of measurement points increases the accuracy of the inverse solution. However, in cases with a large number of measurement points, further increasing the number of measurement data has little effect on the results.展开更多
The surgical treatment of severe scoliosis and kyphoscoliosis in the pediatric population is complicated and has high morbidity and mortality risks.Severe scoliosis has traditionally been defined by a coronal Cobb ang...The surgical treatment of severe scoliosis and kyphoscoliosis in the pediatric population is complicated and has high morbidity and mortality risks.Severe scoliosis has traditionally been defined by a coronal Cobb angle of greater than 90°or 100°.The usual corrective methods for these patients have been anterior or posterior release and osteotomies using a combined anterior-posterior or posterior-only approach.Many of these patients have pre-existing pulmonary compromise;therefore,an anterior approach is often not reasonable or possible.Acute correction of a deformity may also cause neurologic injury.Halo gravity traction(HGT)allows for progressive,gradual,and sustained correction of the spinal deformity in the coronal,sagittal,and axial planes,leading to a decrease in the amount of correction needed at definitive posterior fusion.This relates to decreased postoperative neurologic deficit and improved pulmonary function.Preoperative HGT has evolved to be the surgical adjunct in the treatment of severe spinal deformity.Indications for HGT,best protocols of application,and optimal duration of traction still lack uniformity;thus,a review of the literature remains relevant and necessary.This review summarizes the existing literature on HGT,including its indications,applications,duration of traction,and associated complications.展开更多
The variation of the nonlinear contact stiffness induced by the elastic wheel-holding effect between the aircraft and tractor has an important effect on the vibration characteristics of an airfield towbarless traction...The variation of the nonlinear contact stiffness induced by the elastic wheel-holding effect between the aircraft and tractor has an important effect on the vibration characteristics of an airfield towbarless traction system,making it essential for ensuring the safety of this emerging towing-out mode.In this paper,the frequency evolutionary tendency of the traction system is studied and obtained considering the variation of nonlinear contact stiffness for the first time.A novel modal analysis method,based on a derived nonlinear contact relationship,is proposed to investigate the vibration characteristics for mechanical system.Frequency veering and mode exchange phenomena in the low-order modes are observed due to the variation of nonlinear contact stiffness.These findings are further validated by the experimental results of a scaled-down model.In addition,it is also found that the veering critical point will be shifted with the external loads.The study provides valuable insights into the vibration characteristics and frequency veering behavior of similar mechanism-based systems,such as towbarless traction system,and has important implications for improving their design and operational performance.展开更多
Peyronie’s disease(PD)presents a multifaceted challenge in contemporary urological practice,marked by penile deformity,pain,and the potential for erectile dysfunction.We meticulously explored the existing literature ...Peyronie’s disease(PD)presents a multifaceted challenge in contemporary urological practice,marked by penile deformity,pain,and the potential for erectile dysfunction.We meticulously explored the existing literature of intralesional/topical interventions,aiming to provide clinicians with a nuanced understanding of available options for comprehensive PD management.To conduct this review,we performed a systematic search using the PubMed,Scopus,and ScienceDirect databases,including the keywords of combination of the“Peyronie’s disease/plastic induration of the penis(PIP)and intralesional/topical treatments”.The study selection was based on adherence to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)guidelines,resulting in the inclusion of 16 articles.We delve into the effectiveness and safety profiles of collagenase Clostridium histolyticum(CCH),interferon,platelet-rich plasma(PRP),hyaluronic acid,botulinum toxin,stem cell,extracorporeal shock wave therapy(ESWT),and traction therapy,assessing their impact on penile curvature,length improvement,and patient-reported symptoms and outcomes.The best options evaluated are intralesional injections of CCH and penile traction devices,alone or in combination.Despite PD remains a challenge for urologists,the objective of this review is to contribute to the evolving landscape of PD management,fostering informed decision-making,and personalized care for individuals grappling with this challenging condition.展开更多
BACKGROUND Gastrointestinal submucosal tumors(SMTs)mostly grew in the lumen,but also some of the lesions were extraluminal,in which the stomach was the most co-mmon site.Gastrointestinal stromal tumor account for a la...BACKGROUND Gastrointestinal submucosal tumors(SMTs)mostly grew in the lumen,but also some of the lesions were extraluminal,in which the stomach was the most co-mmon site.Gastrointestinal stromal tumor account for a large proportion of SMT.Due to the deep lesion location of gastric SMT,endoscopic submucosal dissection related techniques are difficult to operate,while endoscopic full-thickness rese-ction(EFTR)has been widely used in clinical practice because it is less invasive and can preserve the physiological structure and function of the stomach.Ho-wever,complete closure of the gastrectomy site after EFTR is critical.If the closure is incomplete,it may cause peritonitis,late perforation and other conditions,and even require further surgical intervention.Although there are currently a number of suture devices and techniques that can be used to promote closure,they have the problem of requiring additional equipment or being inconvenient to use.Although metal clips are widely used,their effectiveness depends on the size and tension of the defect.Therefore,an effective and convenient endoscopic closure technique is urgently needed to solve the closure problem of gastric SMTs after treatment.AIM To investigate the effect of combined application of the preclosure technique and dental floss traction in gastric wound closure following EFTR.METHODS In this study,the data of 94 patients treated for gastric SMTs at the Gastrointestinal Endoscopy Center of the Affiliated Union Hospital of Fujian Medical University from April 2022 to May 2023 were retrospectively analyzed.The patients were divided into a preclosure group(54 patients)and a non-preclosure group(40 patients)on the basis of the timing of wound closure with titanium clips after dental floss traction-assisted EFTR.Each patient in the preclosure group had their wounds preclosed with titanium clips after subtotal lesion resection,whereas each patient in the non-preclosure group had their wounds closed with titanium clips after total lesion resection.The lesion size,wound closure time,number of titanium clips used,incidence of postoperative complications,and postoperative hospitalization time were compared between the two groups.RESULTS The wound closure time was significantly shorter in the preclosure group than in the non-preclosure group(6.69±2.109 minutes vs 11.65±3.786 minutes,P<0.001).The number of titanium clips used was significantly lower in the preclosure group(8.93±2.231)than in the non-preclosure group(12.05±4.495)(P<0.001).There was no sig-nificant difference between the two groups in terms of the need for an indwelling gastric tube or the length of postoperative hospital stay(6.41±1.31 vs 6.13±1.06 days).For all patients in the preclosure group and the non-preclosure group,resection was completed successfully without bleeding,abdominal pain,abdominal distension,or other postoperative complications.CONCLUSION Application of the preclosure technique combined with dental floss traction can be used intraoperatively to effectively close the surgical wound in patients undergoing EFTR,reliably preventing the tumor from falling into the peritoneal cavity.展开更多
Critical for metering and protection in electric railway traction power supply systems(TPSSs),the measurement performance of voltage transformers(VTs)must be timely and reliably monitored.This paper outlines a three-s...Critical for metering and protection in electric railway traction power supply systems(TPSSs),the measurement performance of voltage transformers(VTs)must be timely and reliably monitored.This paper outlines a three-step,RMS data only method for evaluating VTs in TPSSs.First,a kernel principal component analysis approach is used to diagnose the VT exhibiting significant measurement deviations over time,mitigating the influence of stochastic fluctuations in traction loads.Second,a back propagation neural network is employed to continuously estimate the measurement deviations of the targeted VT.Third,a trend analysis method is developed to assess the evolution of the measurement performance of VTs.Case studies conducted on field data from an operational TPSS demonstrate the effectiveness of the proposed method in detecting VTs with measurement deviations exceeding 1%relative to their original accuracy levels.Additionally,the method accurately tracks deviation trends,enabling the identification of potential early-stage faults in VTs and helping prevent significant economic losses in TPSS operations.展开更多
Objective: To analyze the therapeutic effect of combining dental arch splint intermaxillary traction with rigid internal fixation for the treatment of facial comminuted fractures. Methods: Sixty patients with facial c...Objective: To analyze the therapeutic effect of combining dental arch splint intermaxillary traction with rigid internal fixation for the treatment of facial comminuted fractures. Methods: Sixty patients with facial comminuted fractures admitted for treatment between July 2023 and December 2024 were selected. Using a random number table method, 30 patients were assigned to the observation group, where moderate traction using a dental arch splint combined with rigid internal fixation was applied. Another 30 patients were assigned to the control group and only received dental arch splint traction treatment. The total effective rate, postoperative recovery indicators, periodontal status, complication rate, and quality of life scores were compared between the two groups. Results: The total effective rate in the observation group was higher than that in the control group. The postoperative recovery indicators and periodontal status in the observation group were superior to those in the control group. The complication rate and quality of life score were lower in the observation group compared to the control group, with P < 0.05. Conclusion: Combining dental arch splint intermaxillary traction with rigid internal fixation can improve the periodontal status and quality of life of patients with facial comminuted fractures, shorten postoperative recovery time, reduce various complications, and enhance surgical efficacy.展开更多
BACKGROUND This case report presents an innovative approach to managing a complex class II division 1 malocclusion with ectopic maxillary canines using a modified twin block(TB)appliance.The modification facilitated s...BACKGROUND This case report presents an innovative approach to managing a complex class II division 1 malocclusion with ectopic maxillary canines using a modified twin block(TB)appliance.The modification facilitated simultaneous skeletal correction and canine eruption,reducing treatment time and improving patient satisfaction.CASE SUMMARY A 14-year-old male presented with concerns about a retruded chin and spacing between teeth.Clinical and radiographic evaluation revealed a class II division 1 malocclusion on a moderate class II skeletal base,with palatally impacted maxillary canines.Treatment involved a modified Clark TB appliance designed with hooks to allow active traction of the canines,followed by comprehensive fixed orthodontics.Over 18 months,the patient achieved improved occlusion,corrected overjet and overbite,successful eruption of the impacted canines,and enhanced facial aesthetics.The final results showed significant dental and skeletal improvement without requiring surgical intervention.CONCLUSION A modified TB appliance can effectively manage class II malocclusion with impacted canines in growing patients.The modified approach combining functional mandibular advancement and active canine traction represents a lessdocumented clinical adaptation,offering a valuable,efficient alternative to traditional two-phase interventions.展开更多
文摘AIM: To describe the en bloc perfluorodissection(EBPD) technique and to demonstrate the applicabilityof using preoperative intravitreal bevacizumab duringsmall-gauge vitreoretinal surgery(23-gauge transconjunctival sutureless vitrectomy) in eyes with advancedproliferative diabetic retinopathy(PDR) with tractionalretinal detachment(TRD).METHODS: This is a prospective, interventional caseseries. Participants included 114(eyes) with advancedproliferative diabetic retinopathy and TRD. EBPD wasperformed in 114 eyes(consecutive patients) during23-gauge vitrectomy with the utilization of preoperativebevacizumab(1.25 mg/-0.05 mL). Patients mean age was 45 years(range, 21-85 years). Surgical time had a mean of 55 min(Range, 25-85 min). Mean follow up of this group of patients was 24 mo(range, 12-32 mo). Main outcome measures included best-corrected visual acuity(BCVA), retinal reattachment, and complications.RESULTS: Anatomic success occurred in 100%(114/-114) of eyes. Significant visual improvement [≥ 2 Early Treatment Diabetic Retinopathy Study(ETDRS) lines] was obtained in 69.2%(79/-114), in 26 eyes(22.8%) BCVA remained stable, and in 8 eyes(7%) BCVA decreased(≥ 2 ETDRS lines). Final BCVA was 20/-50 or better in 24% of eyes, between 20/-60 and 20/-400 in 46% of eyes, and worse than 20/-400 in 30% of eyes. Complications included cataract in 32(28%) eyes, iatrogenic retinal breaks in 9(7.8%) eyes, vitreous hemorrhage requiring another procedure in 7(6.1%) eyes, and phthisis bulbi in 1(0.9%) eye.CONCLUSION: This study demonstrates the usefulne-ss of using preoperative intravitreal bevacizumab and EBPD during smallgauge vitreoretinal surgery in eyes with TRD in PDR.
文摘AIM:To evaluate the outcomes of pars plana vitrectomy(PPV) without the use of an ocular tamponade in patients having tractional retinal detachment(TRD) secondary to proliferative diabetic retinopathy(PDR).METHODS:It was an interventional study conducted at the Department of Ophthalmology,B.V.Hospital,Bahawalpur,Pakistan,from July 2011 to July 2012.A total of 75 patients(84 eyes) having TRD secondary to PDR were treated by PPV without using an ocular tamponade.All patients included in the study had a tractional retinal detachement secondary to proliferative diabetic retinopathy but didn’t have or develop retinal breaks before or during the study period.The surgical procedure included a PPV combined with the removal of the tractional retinal membranes and the application of endolaser photocoagulation to the retina.The mean follow-up period was 12 months. RESULTS:Successful retinal reattachement was observed in 78 of the operated eyes(92.8%).In these patients,the retina remained attached till the end of the one year follow-up period.Improvement in best corrected visual acuity(BCVA) was seen in 63 eyes(75%).The visual acuity remained unchanged in 9 eyes(10.7%).Mean improvement in BCVA was 2.00 +1.24 at baseline to 1.24+1.22(P【0.05) at the end of the followup period.CONCLUSION:In the absence of the retinal breaks,a TRD secondary to PDR can be successfully treated by pars plana vitrectomy without the use of an ocular tamponade.
基金supported by the National Natural Science Foundation of China(No.52388102)the Sichuan Science and Technology Program(No.2024NSFTD0011)the Fundamental Research Funds for the State Key Laboratory of Rail Transit Vehicle System of Southwest Jiaotong University(No.2023TPL-T11).
文摘The dynamic characteristics of the track system can directly affect its service performance and failure process.To explore the load characteristics and dynamic response of the track system under the dynamic loads from the rack vehicle in traction conditions,a systematic test of the track subsystem was carried out on a large-slope test line.In the test,the bending stress of the rack teeth,the wheel-rail forces,and the acceleration of crucial components in the track system were measured.Subsequently,a detailed analysis was conducted on the tested signals of the rack railway track system in the time domain and the time-frequency domains.The test results indicate that the traction force significantly affects the rack tooth bending stress and the wheel-rail forces.The vibrations of the track system under the traction conditions are mainly caused by the impacts generated from the gear-rack engagement,which are then transferred to the sleepers,the rails,and the ballast beds.Furthermore,both the maximum stress on the racks and the wheel-rail forces measured on the rails remain below their allowable values.This experimental study evaluates the load characteristics and reveals the vibration characteristics of the rack railway track system under the vehicle’s ultimate load,which is very important for the load-strengthening design of the key components such as racks and the vibration and noise reduction of the track system.
基金supported in part by the Universitat Politècnica de València under grant PAID-10-21supported through AMRITA Seed Grant(Proposal ID:ASG2022188)。
文摘Switched Reluctance Motors(SRMs),outfitted with rugged construction,good speed range,high torque density,and rare earth-free nature that outweigh induction motors(IM)and permanent magnet synchronous motor(PMSM),afford a broad range of applications in the domain of electric vehicles(EVs).Standard copper magnetic wire and low-carbon steel laminations are used to construct SRMs,which give them high efficiency in the range of 85-95%.Despite SRM's desirable features over traditional motor-speed drives,high torque ripples and radial distortions constrain their deployment in EVs.Precise rotor position is imperative for effective management of the speed and torque of SRMs.This paper provides an illustrative compendium on review of the torque-speed control and ripple mitigation techniques using design enhancements and control methods for SRM drives for EV applications.The various schemes were evaluated on their performance metricsoperational speed range,control complexity,practical realization,need for pre-stored parameters(look-up tables of current,inductance and torque profiles)and motor controller memory requirements.The findings provide valuable insights into balancing the gains and trade-offs associated with EV applications.Furthermore,they pinpoint opportunities for enhancement by analyzing the cost and technical aspects of different SRM controllers.
基金Supported by the Hospital-level Program of Shiyan Taihe Hospital(2022JJXM144).
文摘[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Methods]Seventy LDH patients treated at the orthopedic rehabilitation outpatient and inpatient departments of Shiyan Taihe Hospital from June 2022 to December 2024 were randomly divided into a treatment group(CFT therapy,n=35)and a control group(traditional traction,n=35).The treatment group received cyclic flexion traction(traction force of 30%-50%body weight with a cycle of 60-30-30 sec),while the control group received supine position linear traction.Both groups underwent 4 weeks of treatment,with assessments including visual analog scale(VAS),Oswestry Disability Index(ODI),and straight leg raising test(SLRT)angles.[Results]The treatment group showed a significantly greater reduction in VAS scores(from 6.97 to 2.31)compared to the control group(from 6.89 to 3.74)(P<0.05).Similarly,ODI improvement(41.62→15.73 compared with 40.98→22.84)and SLRT angle increase(41.23°→76.47°compared with 42.09°→64.19°)were more pronounced in the treatment group(all P<0.05).[Conclusions]Through dynamic decompression mechanisms,CFT therapy demonstrates superior efficacy to traditional traction in pain relief,functional recovery,and nerve root decompression(effective rate 94.29%compared with 77.14%,P<0.05),representing a superior non-surgical treatment option.
文摘Replacing the energy density and convenience of diesel fuel for all forms of fossil fuel-powered trains presents significant challenges.Unlike the traditional evolutions of rail which has largely self-optimised to different fuels and cost structures over 150 years,the challenges now present with a timeline of just a few decades.Fortunately,unlike the mid-1800s,simulation and modelling tools are now quite advanced and a full range of scenarios of operations and train trips can be simulated before new traction systems are designed.Full trip simulations of large heavy haul trains or high speed passenger trains are routinely completed controlled by emulations of human drivers or automated control systems providing controls of the“virtual train”.Recent developments in digital twins can be used to develop flexible and dynamic models of passenger and freight rail systems to support the new complexities of decarbonisation efforts.Interactions between many different traction components and the train multibody system can be considered as a system of systems.Adopting this multi-modelling paradigm enables the secure and integrated interfacing of diverse models.This paper demonstrates the application of the multi-modelling approach to develop digital twins for rail decarbonisation traction and it presents physics-based multi-models that include key components required for studying rail decarbonisation problems.Specifically,the challenge of evaluating zero-emission options is addressed by adding further layers of modelling to the existing fully detailed multibody dynamics simulations.The additional layers detail control options,energy storage,the alternate traction system components and energy management systems.These traction system components may include both electrical system and inertia dynamics models to accurately represent the driveline and control systems.This paper presents case study examples of full trip scenarios of both long haul freight trains and higher speed passenger trains.These results demonstrate the many complex scenarios that are difficult to anticipate.Flowing on from this,risks can be assessed and practical designs of zero-emission systems can be proposed along with the required recharging or refuelling systems.
文摘Vascular smooth muscle cells (VSMCs) in the arterial walls play important roles in regulating vascular contraction and dilation. VSMCs actively remodel the arterial walls and dedifferentiate from the contractile to the synthetic phenotype under pathological conditions. The mechanism underlying phenotypic transition of VSMCs is important for understanding its role in the pathophysiology of disease. Although numerous studies have reported various biochemical pathways that stimulate the phenotypic transition of VSMCs, very little is known about relation between their phenotypic transition and cellular traction force, which affects many cellular functions. In this study, we induced the differentiation of cultured VSMCs from the synthetic to the contractile phenotype by a low-serum cultivation and investigated changes in the cell traction forces using traction force microscopy technique. The expression of α-SMA, a contractile phenotype marker protein, was significantly upregulated with maturation of actin stress fibers in the low-serum culture, indicating VSMC differentiation was promoted in our experiments. The cells changed their morphology to an elongated bipolar shape, and the direction of the cell traction forces tended to align in the direction of the cell’s major axis. Despite the promotion of contractile differentiation in VSMCs, the overall cell traction forces were significantly reduced, indicating that excessive cell mechanical tension, which might induce cell proliferation and migration, was suppressed during contractile differentiation. These results suggest that suppression of cell traction force and enhanced force polarity might be key factors in VSMC differentiation induced by low serum culture.
文摘BACKGROUND Developmental dysplasia of the hip(DDH)remains a significant public health challenge,particularly in developing countries where cultural factors and limited access to appropriate medical equipment complicate optimal management.AIM To evaluate the difficulties encountered in the management of DDH in our healthcare setting.METHODS A retrospective,single-center study was conducted over nine years(2015-2023),including 20 patients(26 hips)with idiopathic DDH.Patients with post-traumatic or post-infectious hip dislocations were excluded.Data collected included age at diagnosis,laterality,Tönnis classification,duration of traction,and surgical interventions.RESULTS The mean age at diagnosis was 35.6 months(4 months to 10.8 years).Dislocation was unilateral in 70%of cases;69.2%were classified as Tönnis stage 3 or 4.The average traction duration was 57.5 days.Surgery was performed in 8 hips.Among 16 patients with regular follow-up,10 showed good outcomes,3 excellent,and 3 fair according to the McKay score.Older age at treatment(>1 year),bilateral dislocation,and higher severity(Tönnis stages 3 and 4)were associated with worse functional outcomes.No significant correlation was found between functional and radiological results.Residual dysplasia occurred in 3 patients,and 1 re-dislocation was noted.CONCLUSION Delayed diagnosis and advanced severity at presentation are key challenges in managing DDH in our context.Nevertheless,appropriate management can achieve generally favorable outcomes,despite complications linked to prolonged treatment and resource limitations.
文摘Travel broadens the mind.And now travelers can broaden their minds by exploring the amazing geographical,cultural and culinary diversity that China offers,facilitated by the new visa-free transit policy.With visitors from 54 countries now able to stay in China for 10 days in transit without a visa and travel further in the country,“China travel”has gained new traction.
文摘New stationary power storage cabinets have been set up beside the parking lots of the Green Eco Manufacture(GEM)Industrial Park in Wuhan,Hubei Province,to charge electric vehicles(EVs).Each cabinet contains five modules of used traction batteries that can be used for eight to 10 years before they need to be replaced.These traction batteries are full of precious metals like lithium,cobalt and nickel.They’re what is often called the“power core”of EVs.
文摘A detailed comparative examination of the Weibull and Gaussian statistical methods is offered to analyze the mechanical properties of natural date palm fibers. Tensile tests were conducted on 35 fiber samples using a universal testing machine to gather data on stress, strain, and Young's modulus. This data was then analyzed through both statistical approaches to evaluate their ability to model important mechanical characteristics, including tensile strength, strain at break, and Young's modulus. The study identifies the strengths and weaknesses of each statistical method when it is applied to natural fibers, emphasizing their suitability for modeling different mechanical properties. The results of this analysis provide important insights that can guide the selection of the most appropriate statistical method, depending on the type of mechanical property being studied and the specific characteristics of the data. This research makes significant contributions to advancing the understanding of natural fiber mechanics and improving the methods used for their characterization.
基金Supported by the National Natural Science Foundation of China(No.82371084).
文摘AIM:To investigate the outcomes and prognosis of macular epiretinal membrane(ERM)after pars plana vitrectomy(PPV)in patients with high myopia(HM),focusing on the optimal timing of surgery and its impact on prognosis.METHODS:The clinical data of 50 eyes from 49 patients diagnosed with ERM,who were highly myopic and underwent PPV were retrospectively analyzed.The patients with ERM were classified into five groups based on the characteristics associated with different levels of myopic traction maculopathy.Group 1:Simple ERM without complex vertical and tangential direction traction on retina on optical coherence tomography(OCT)image;Group 2:ERM with obvious macular foveal schisis,without macular hole(MH);Group 3:ERM with inner lamellar MH,with or without macular foveal schisis;Group 4:ERM with outer lamellar MH,with or without foveal retinal detachment(RD);Group 5:ERM with full-thickness MH.Baseline characteristics,changes in best corrected visual acuity(BCVA)before and after surgery,and anatomical characteristics through spectral domain OCT were compared.RESULTS:The 50 eyes were followed for 6mo,with an average age of 58.66y and an average axial length(AL)of 28.69 mm.Among the five groups,postoperative logMAR BCVA improved(P<0.05).Group 1 had better mean BCVA at baseline(0.59±0.36)and at 6mo postoperatively(0.16±0.22)compared to the other groups,while Group 5 had worse mean BCVA at baseline(1.68±0.45)and at 6mo postoperatively(1.27±0.64).There were no statistically significant differences in sex,age or AL between the groups(P>0.05).OCT showed that Groups 4 and 5 exhibited poorer macular anatomy compared to the other three groups,as evidenced by lower rates of central retinal reattachment(64.3%in Group 4,86.7%in Group 5)and integrity of the inner segment/outer segment of photoreceptor junction(28.6%in Group 4,26.7%in Group 5).CONCLUSION:PPV is an effective treatment for ERM in patients with HM.All groups showed postoperative improvement in BCVA compared to preoperative levels,demonstrating the necessity of surgical intervention.Early intervention,particularly before the fourth stage of the disease,may lead to better visual outcomes.
基金funded by Vice Chancellor of Research at Shiraz University(grant 3GFU2M1820).
文摘The identification of the traction acting on a portion of the surface of an anisotropic solid is very important in structural health monitoring and optimal design of structures. The traction can be determined using inverse methods in which displacement or strain measurements are taken at several points on the body. This paper presents an inverse method based on the method of fundamental solutions for the traction identification problem in two-dimensional anisotropic elasticity. The method of fundamental solutions is an efficient boundary-type meshless method widely used for analyzing various problems. Since the problem is linear, the sensitivity analysis is simply performed by solving the corresponding direct problem several times with different loads. The effects of important parameters such as the number of measurement data, the position of the measurement points, the amount of measurement error, and the type of measurement, i.e., displacement or strain, on the results are also investigated. The results obtained show that the presented inverse method is suitable for the problem of traction identification. It can be concluded from the results that the use of strain measurements in the inverse analysis leads to more accurate results than the use of displacement measurements. It is also found that measurement points closer to the boundary with unknown traction provide more reliable solutions. Additionally, it is found that increasing the number of measurement points increases the accuracy of the inverse solution. However, in cases with a large number of measurement points, further increasing the number of measurement data has little effect on the results.
文摘The surgical treatment of severe scoliosis and kyphoscoliosis in the pediatric population is complicated and has high morbidity and mortality risks.Severe scoliosis has traditionally been defined by a coronal Cobb angle of greater than 90°or 100°.The usual corrective methods for these patients have been anterior or posterior release and osteotomies using a combined anterior-posterior or posterior-only approach.Many of these patients have pre-existing pulmonary compromise;therefore,an anterior approach is often not reasonable or possible.Acute correction of a deformity may also cause neurologic injury.Halo gravity traction(HGT)allows for progressive,gradual,and sustained correction of the spinal deformity in the coronal,sagittal,and axial planes,leading to a decrease in the amount of correction needed at definitive posterior fusion.This relates to decreased postoperative neurologic deficit and improved pulmonary function.Preoperative HGT has evolved to be the surgical adjunct in the treatment of severe spinal deformity.Indications for HGT,best protocols of application,and optimal duration of traction still lack uniformity;thus,a review of the literature remains relevant and necessary.This review summarizes the existing literature on HGT,including its indications,applications,duration of traction,and associated complications.
基金co-supported by the Key Projects of the Civil Aviation Joint Fund of the National Natural Science Foundation of China(No.U2033208)。
文摘The variation of the nonlinear contact stiffness induced by the elastic wheel-holding effect between the aircraft and tractor has an important effect on the vibration characteristics of an airfield towbarless traction system,making it essential for ensuring the safety of this emerging towing-out mode.In this paper,the frequency evolutionary tendency of the traction system is studied and obtained considering the variation of nonlinear contact stiffness for the first time.A novel modal analysis method,based on a derived nonlinear contact relationship,is proposed to investigate the vibration characteristics for mechanical system.Frequency veering and mode exchange phenomena in the low-order modes are observed due to the variation of nonlinear contact stiffness.These findings are further validated by the experimental results of a scaled-down model.In addition,it is also found that the veering critical point will be shifted with the external loads.The study provides valuable insights into the vibration characteristics and frequency veering behavior of similar mechanism-based systems,such as towbarless traction system,and has important implications for improving their design and operational performance.
文摘Peyronie’s disease(PD)presents a multifaceted challenge in contemporary urological practice,marked by penile deformity,pain,and the potential for erectile dysfunction.We meticulously explored the existing literature of intralesional/topical interventions,aiming to provide clinicians with a nuanced understanding of available options for comprehensive PD management.To conduct this review,we performed a systematic search using the PubMed,Scopus,and ScienceDirect databases,including the keywords of combination of the“Peyronie’s disease/plastic induration of the penis(PIP)and intralesional/topical treatments”.The study selection was based on adherence to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)guidelines,resulting in the inclusion of 16 articles.We delve into the effectiveness and safety profiles of collagenase Clostridium histolyticum(CCH),interferon,platelet-rich plasma(PRP),hyaluronic acid,botulinum toxin,stem cell,extracorporeal shock wave therapy(ESWT),and traction therapy,assessing their impact on penile curvature,length improvement,and patient-reported symptoms and outcomes.The best options evaluated are intralesional injections of CCH and penile traction devices,alone or in combination.Despite PD remains a challenge for urologists,the objective of this review is to contribute to the evolving landscape of PD management,fostering informed decision-making,and personalized care for individuals grappling with this challenging condition.
文摘BACKGROUND Gastrointestinal submucosal tumors(SMTs)mostly grew in the lumen,but also some of the lesions were extraluminal,in which the stomach was the most co-mmon site.Gastrointestinal stromal tumor account for a large proportion of SMT.Due to the deep lesion location of gastric SMT,endoscopic submucosal dissection related techniques are difficult to operate,while endoscopic full-thickness rese-ction(EFTR)has been widely used in clinical practice because it is less invasive and can preserve the physiological structure and function of the stomach.Ho-wever,complete closure of the gastrectomy site after EFTR is critical.If the closure is incomplete,it may cause peritonitis,late perforation and other conditions,and even require further surgical intervention.Although there are currently a number of suture devices and techniques that can be used to promote closure,they have the problem of requiring additional equipment or being inconvenient to use.Although metal clips are widely used,their effectiveness depends on the size and tension of the defect.Therefore,an effective and convenient endoscopic closure technique is urgently needed to solve the closure problem of gastric SMTs after treatment.AIM To investigate the effect of combined application of the preclosure technique and dental floss traction in gastric wound closure following EFTR.METHODS In this study,the data of 94 patients treated for gastric SMTs at the Gastrointestinal Endoscopy Center of the Affiliated Union Hospital of Fujian Medical University from April 2022 to May 2023 were retrospectively analyzed.The patients were divided into a preclosure group(54 patients)and a non-preclosure group(40 patients)on the basis of the timing of wound closure with titanium clips after dental floss traction-assisted EFTR.Each patient in the preclosure group had their wounds preclosed with titanium clips after subtotal lesion resection,whereas each patient in the non-preclosure group had their wounds closed with titanium clips after total lesion resection.The lesion size,wound closure time,number of titanium clips used,incidence of postoperative complications,and postoperative hospitalization time were compared between the two groups.RESULTS The wound closure time was significantly shorter in the preclosure group than in the non-preclosure group(6.69±2.109 minutes vs 11.65±3.786 minutes,P<0.001).The number of titanium clips used was significantly lower in the preclosure group(8.93±2.231)than in the non-preclosure group(12.05±4.495)(P<0.001).There was no sig-nificant difference between the two groups in terms of the need for an indwelling gastric tube or the length of postoperative hospital stay(6.41±1.31 vs 6.13±1.06 days).For all patients in the preclosure group and the non-preclosure group,resection was completed successfully without bleeding,abdominal pain,abdominal distension,or other postoperative complications.CONCLUSION Application of the preclosure technique combined with dental floss traction can be used intraoperatively to effectively close the surgical wound in patients undergoing EFTR,reliably preventing the tumor from falling into the peritoneal cavity.
基金supported by the National Natural Science Foundation of China(No.52107125)Applied Basic Research Project of Sichuan Province(No.2022NSFSC0250)Chengdu Guojia Electrical Engineering Co.,Ltd.(No.KYL202312-0043).
文摘Critical for metering and protection in electric railway traction power supply systems(TPSSs),the measurement performance of voltage transformers(VTs)must be timely and reliably monitored.This paper outlines a three-step,RMS data only method for evaluating VTs in TPSSs.First,a kernel principal component analysis approach is used to diagnose the VT exhibiting significant measurement deviations over time,mitigating the influence of stochastic fluctuations in traction loads.Second,a back propagation neural network is employed to continuously estimate the measurement deviations of the targeted VT.Third,a trend analysis method is developed to assess the evolution of the measurement performance of VTs.Case studies conducted on field data from an operational TPSS demonstrate the effectiveness of the proposed method in detecting VTs with measurement deviations exceeding 1%relative to their original accuracy levels.Additionally,the method accurately tracks deviation trends,enabling the identification of potential early-stage faults in VTs and helping prevent significant economic losses in TPSS operations.
基金Special Support Program for Scientific and Technological Talent“Application and Impact of Dental Arch Splint Intermaxillary Traction Combined with Rigid Internal Fixation on Oral Health in Patients with Facial Fractures”(DX2023BR18)。
文摘Objective: To analyze the therapeutic effect of combining dental arch splint intermaxillary traction with rigid internal fixation for the treatment of facial comminuted fractures. Methods: Sixty patients with facial comminuted fractures admitted for treatment between July 2023 and December 2024 were selected. Using a random number table method, 30 patients were assigned to the observation group, where moderate traction using a dental arch splint combined with rigid internal fixation was applied. Another 30 patients were assigned to the control group and only received dental arch splint traction treatment. The total effective rate, postoperative recovery indicators, periodontal status, complication rate, and quality of life scores were compared between the two groups. Results: The total effective rate in the observation group was higher than that in the control group. The postoperative recovery indicators and periodontal status in the observation group were superior to those in the control group. The complication rate and quality of life score were lower in the observation group compared to the control group, with P < 0.05. Conclusion: Combining dental arch splint intermaxillary traction with rigid internal fixation can improve the periodontal status and quality of life of patients with facial comminuted fractures, shorten postoperative recovery time, reduce various complications, and enhance surgical efficacy.
文摘BACKGROUND This case report presents an innovative approach to managing a complex class II division 1 malocclusion with ectopic maxillary canines using a modified twin block(TB)appliance.The modification facilitated simultaneous skeletal correction and canine eruption,reducing treatment time and improving patient satisfaction.CASE SUMMARY A 14-year-old male presented with concerns about a retruded chin and spacing between teeth.Clinical and radiographic evaluation revealed a class II division 1 malocclusion on a moderate class II skeletal base,with palatally impacted maxillary canines.Treatment involved a modified Clark TB appliance designed with hooks to allow active traction of the canines,followed by comprehensive fixed orthodontics.Over 18 months,the patient achieved improved occlusion,corrected overjet and overbite,successful eruption of the impacted canines,and enhanced facial aesthetics.The final results showed significant dental and skeletal improvement without requiring surgical intervention.CONCLUSION A modified TB appliance can effectively manage class II malocclusion with impacted canines in growing patients.The modified approach combining functional mandibular advancement and active canine traction represents a lessdocumented clinical adaptation,offering a valuable,efficient alternative to traditional two-phase interventions.
