The ribbing problem has serious influence on the steel product quality, which produces additional shape waves on the surface of uncoiled steel strip on the process of curl. Nonlinear spline finite element method （n-s...The ribbing problem has serious influence on the steel product quality, which produces additional shape waves on the surface of uncoiled steel strip on the process of curl. Nonlinear spline finite element method （n-spline FEM） is adopted to establish the relationship between the ribbing height and deflection of additional shape wave, for example, post buckling deformation. The proposed spline FEM is more effective and convenient than traditional finite element method in the buckling analysis. Using the spline FEM, the shape wave caused by the ribbing is calculated, and then the ribbing values can be obtained which are difficult to measure in practice. At the same time, the judgment rule is also given for estimating the strip quality according to the ribbing value.展开更多
BACKGROUND Slipping rib syndrome(SRS)is caused by abnormal subluxation of floating ribs,resulting in chronic pain and possible tissue damage.Its prevalence is often overlooked,as it shares symptoms with other musculos...BACKGROUND Slipping rib syndrome(SRS)is caused by abnormal subluxation of floating ribs,resulting in chronic pain and possible tissue damage.Its prevalence is often overlooked,as it shares symptoms with other musculoskeletal conditions,and is more common in young females and athletes.Symptoms include pain along the lower rib margin,aggravated by trunk movements,deep breathing and coughing.Treatment usually starts conservatively with physiotherapy and analgesics.In severe cases,extrapleural rib resection may be required.CASE SUMMARY In April 2023,a 24-year-old woman presented with persistent right hemithorax pain in the eleventh rib for one year.Instrumental examinations,including ultrasonography and magnetic resonance imaging,were negative for abdominal and osteochondral abnormalities.The pain intensity,rated 8/10 on the numeric rating scale(NRS),remained unresponsive to pain therapy.After a careful literature review and discussion with the patient,we opted for a minimally invasive surgical approach.Under general anesthesia,a mini-thoracotomy was performed along the anterior course of the eleventh rib.After exposure,abnormal rib mobility was detected,which led to resection of the medial margin and anchoring to the overlying rib with nonabsorbable sutures.Histological examination revealed no abnormalities.The patient was discharged on the first postoperative day.Pain decreased significantly,reaching 1/10 on the NRS at one month.At 3 months,the patient had mild fluctuating pain(2/10)requiring occasional analgesics but did not interfere with daily activities.CONCLUSION Minimally invasive rib-preserving surgery effectively reduces pain and hospitalization time,offering a valid alternative to conventional rib resection for refractory SRS.展开更多
Integrating Bayesian Optimization with Volume of Fluid (VOF) simulations, this work aims to optimize the operational conditions and geometric parameters of T-junction microchannels for target droplet sizes. Bayesian O...Integrating Bayesian Optimization with Volume of Fluid (VOF) simulations, this work aims to optimize the operational conditions and geometric parameters of T-junction microchannels for target droplet sizes. Bayesian Optimization utilizes Gaussian Process (GP) as its core model and employs an adaptive search strategy to efficiently explore and identify optimal combinations of operational parameters within a limited parameter space, thereby enabling rapid optimization of the required parameters to achieve the target droplet size. Traditional methods typically rely on manually selecting a series of operational parameters and conducting multiple simulations to gradually approach the target droplet size. This process is time-consuming and prone to getting trapped in local optima. In contrast, Bayesian Optimization adaptively adjusts its search strategy, significantly reducing computational costs and effectively exploring global optima, thus greatly improving optimization efficiency. Additionally, the study investigates the impact of rectangular rib structures within the T-junction microchannel on droplet generation, revealing how the channel geometry influences droplet formation and size. After determining the target droplet size, we further applied Bayesian Optimization to refine the rib geometry. The integration of Bayesian Optimization with computational fluid dynamics (CFD) offers a promising tool and provides new insights into the optimal design of microfluidic devices.展开更多
In this work,numerical simulations are performed to investigate the influence of combining ribs and triangular cavities on the thermal-hydraulic performance(THP)of MCHS at fluid velocities ranging from1 to 4 m/s(corre...In this work,numerical simulations are performed to investigate the influence of combining ribs and triangular cavities on the thermal-hydraulic performance(THP)of MCHS at fluid velocities ranging from1 to 4 m/s(corresponding to Reynolds numbers(Re)of 129.75 to 519).Specifically,the ribs are positioned on the bottomwall,and the rib width is equal to the mini-channel width,while the triangular cavities are arranged on the two side walls of the MCHS.By analyzing and comparing key parameters such as velocity distribution,streamline patterns,pressure drop,skin friction coefficient(C_(f)),Nusselt number(Nu),friction factor(f),temperature fields,and performance evaluation criterion(PEC),the advantages of rib-cavity coupling configuration in enhancing THP are systematically discussed.Furthermore,the effects of cavity distribution(left,middle,and right),cavity depth(0.04,0.06,and 0.08 mm),and rib height(0.02,0.04,and 0.06 mm)on THP are analyzed to optimize the geometric parameters of the ribs and the cavities.The numerical simulation results indicate that,in comparison to the use of ribs or cavities alone,rib-cavity coupling can further improve the THP ofMCHS without causing a significant increase in pressure drop.The downstreamwall of the cavity is perpendicular to the flow direction which is more favorable for enhancing the heat transfer performance.Increasing the cavity depth improves the heat transfer performance ofMCHS,themaximumNu ratio increase by 35%at a rib height of 0.06 mm.However the increase in the rib height leads to a significant increase in the pressure drop,which in turn exerts a negative impact on THP,a maximumPEC of 1.198 is obtained at a rig height of 0.02 mm.The greatest improvement in THP,reaching 19.8%,is achieved when the cavity depth is 0.08 mm and the rib height is 0.02 mm.展开更多
Squeezing phenomena can lead to severe loads in deep tunnels,especially in the presence of a low ratio of surrounding rock strength to overburden pressure.For this reason,it is highly imperative to analyze and identif...Squeezing phenomena can lead to severe loads in deep tunnels,especially in the presence of a low ratio of surrounding rock strength to overburden pressure.For this reason,it is highly imperative to analyze and identify a suitable methodology to estimate the squeezing potential and select a proper support system of rock mass.This study aims to reveal the causes of failure of Tishreen tunnel in the west of Syria and develop remediation measures accordingly so as to bring the tunnel back into service.The tunnel in question was subjected to successive failures such as buckling and spalling of side walls,floor heave,and extremely large convergence reaching the failure state of the tunnel lining.In this study,an effective way was demonstrated to evaluate the squeezing potential of the tunnel lining and appropriate modeling of the long-term response of a tunnel excavated in weak rock.Specifically,the causes of failure of Tishreen tunnel were first evaluated by empirical approaches.Then,a numerical model was developed using a timedependent constitutive model to investigate the time-dependent response of the tunnel lining.On this basis,this study proposed an effective reinforcement schemes including steel ribs,grout injection,ground anchors,and new lining of reinforced concrete.The results show that the Burger viscoplastic model simulates effectively the resulting deformation and creep behavior of squeezing ground.It is also observed that using a combined heavy support system can provide efficient control over squeezing deformation and maintain the serviceability of the tunnel under study.展开更多
Rib spalling is a highly severe issue during mining in deep-buried large-mining-height working faces.This study takes Zhaogu No.2 Coal Mine in Jiaozuo Coalfield,China,as the research background and carries out three f...Rib spalling is a highly severe issue during mining in deep-buried large-mining-height working faces.This study takes Zhaogu No.2 Coal Mine in Jiaozuo Coalfield,China,as the research background and carries out three focused works to address this problem.Firstly,field measurements were conducted to clarify rib spalling characteristics:the coal wall is dominated by shear failure,internal cracks are mainly distributed 3–6 m above the coal wall surface,and the maximum depth of crack development reaches 3 m.Secondly,Universal Distinct Element Code(UDEC)numerical simulation software was used to build a rib spalling model,with the Trigon model adopted to divide the coal wall into blocks.Analysis of four key factors shows that increased buried depth and mining height significantly raise the total length of coal wall internal cracks,increasing rib spalling risk,while higher coal body strength and support strength effectively alleviate this phenomenon.Finally,an orthogonal experiment was designed to quantitatively determine the influence degree of the four factors on rib spalling.Results show that coal body strength has the greatest impact,followed by support strength,mining height,and mining depth in order of influence.This study provides valuable theoretical guidance for on-site prevention and control of coal wall rib spalling.展开更多
Background: Reconstruction of Nasal Tip Columella (NTC) subunits is one of the most challenging aspects in functional aesthetic rhinoplasty. Moreover, racial variation for Asian nose rhinoplasty could even demand soph...Background: Reconstruction of Nasal Tip Columella (NTC) subunits is one of the most challenging aspects in functional aesthetic rhinoplasty. Moreover, racial variation for Asian nose rhinoplasty could even demand sophistication of tip and columella strut graft infrastructure enhancement. Various autogenous graft options such as 6th costal cartilage, septal cartilage and conchal cartilage are very commonly considered whilst the 10th costal cartilage is scarcely reported. Objective and Method: The purpose of this manuscript is to illustrate the detailed operative steps to harvest the 10th costal cartilage for infrastructural grafting at NTC subunits by a case illustration. The pros and cons of different cartilage options will be discussed, particularly its application in cleft nose rhinoplasty in Chinese patient. We have adopted the 10th rib as the key option for NTC reconstruction in 11 cases of Chinese cleft secondary rhinoplasty since 2019 and have achieved good and stable results without complications. Conclusion: The 10th costal cartilage is one of the best options in Nasal Tip Columella subunits reconstruction, particularly in complex cleft nose or failure revision aesthetic rhinoplasty cases, due to its safety of harvesting, and the sufficient quality and quantity of grafting materials it provides for simultaneous adjunctive augmentation purpose.展开更多
Objective:To compare the diagnostic value of 99mTc-MDP SPECT/CT and MSCT in detecting thoracic wall and rib involvement in lung adenocarcinoma.Methods:A retrospective analysis was conducted on the imaging data of 78 t...Objective:To compare the diagnostic value of 99mTc-MDP SPECT/CT and MSCT in detecting thoracic wall and rib involvement in lung adenocarcinoma.Methods:A retrospective analysis was conducted on the imaging data of 78 thoracic wall and rib lesions from 66 patients,a total of 32 males and 34 females,aged(53.2±5.6)years old with pathologically confirmed lung adenocarcinoma who underwent both 99mTc-MDP SPECT/CT and MSCT examinations from March 2017 to September 2023.The diagnostic efficacy of the two imaging modalities was compared using pathological confirmation or clinical follow-up as the gold standard.Results:Pathological confirmation or clinical follow-up revealed 74 lesions with thoracic wall bone involvement in lung adenocarcinoma(20 lesions confirmed by surgical pathology and 54 lesions confirmed by clinical follow-up)and 4 lesions without thoracic wall or rib involvement(2 lesions confirmed by surgical pathology and 2 lesions confirmed by clinical follow-up).The diagnostic sensitivity,specificity,and accuracy of 99mTc-MDP SPECT/CT were 97.3%,50.0%,and 94.9%,respectively.Its diagnostic sensitivity and accuracy were higher than those of MSCT(72.3%and 74.4%,respectively),with statistically significant differences(P<0.05).The specificity of 99mTc-MDP SPECT/CT was lower than that of MSCT(100.0%),but the difference was not statistically significant(P<0.05).There were no statistically significant differences in the positive predictive value and negative predictive value between 99mTc-MDP SPECT/CT and MSCT(P>0.05).99mTc-MDP SPECT/CT examination revised the MSCT tumor staging in 14 patients[21.2%(14/66)]with lung adenocarcinoma.Conclusion:99mTc-MDP SPECT/CT imaging demonstrates superior diagnostic efficacy compared to MSCT in detecting thoracic wall and rib involvement in lung adenocarcinoma.It offers more accurate tumor staging than MSCT,and an accurate diagnosis aids in clinical treatment decision-making.展开更多
To improve braking performance and achieve lightweight in transport equipment,it is necessary to implement overall plastic forming manufacturing of the brake pad baseboard(BPB),which is the core safety component of th...To improve braking performance and achieve lightweight in transport equipment,it is necessary to implement overall plastic forming manufacturing of the brake pad baseboard(BPB),which is the core safety component of the brake system.This study presents an innovative multi-DOF envelope forming(MDFEF)process to realize the plastic forming of BPB with thin skin and high reinforcing ribs.The MDFEF principle for BPB,and the design methods for the envelope mold are first presented.Through FE simulations,the behavior of metal flow,uneven growth pattern of reinforcing ribs,evolution of equivalent strain and evolution of forming force in MDFEF of BPB are investigated.To realize MDFEF,an innovative MDFEF equipment driven by parallel linkages is exploited.The force states of linkages in MDFEF are calculated,and the reasonable mold position is determined to reduce the maximum force on the linkages and improve the service performance of MDFEF equipment.The MDFEF experiments of BPB are conducted and qualified BPB is obtained,which demonstrates that the presented MDFEF process and equipment are applicable to manufacture BPB with thin skin and high reinforcing ribs.展开更多
The mass transport and ohmic losses in proton exchange membrane fuel cells(PEMFCs)is significantly influenced by the channel to rib width ratio(CRWR),particularly when accounting for the interfacial contact resistance...The mass transport and ohmic losses in proton exchange membrane fuel cells(PEMFCs)is significantly influenced by the channel to rib width ratio(CRWR),particularly when accounting for the interfacial contact resistance between bipolar plates(BPs)and gas diffusion layers(GDLs)(ICRBP-GDL).Both the determination of the optimal CRWR value and the development of an efficient flow field structure are significantly influenced by ICRBP-GDLs.To investigate this,three-dimensional numerical models were developed,revealing that selecting an optimal CRWR tailored to specific ICRBP-GDL values can effectively balance mass transport and ohmic losses.Building on this insight,a novel island two-dimensional flow field design is proposed,demonstrating the ability to enhance oxygen transport to the catalyst layer(CL)and achieve a more uniform oxygen distribution without increasing ohmic losses.Compared to conventional straight and serpentine flow fields,the island flow field improves output power density by 4.5%and 3.5%,respectively,while reducing the liquid water coverage ratio by 30%.Additionally,the study identifies optimal CRWR values for conventional flow fields corresponding to ICRBP-GDLs of 2.5,5,10,20,and 40 mΩ·cm^(2) as 1.5,1.5,1.0,0.67,and 0.43,respectively.For the island flow field,the optimal CRWRs are consistently smaller-1.5,1.0,0.67,0.43,and 0.43-due to its superior mass transfer capability.This work provides a valuable framework for optimizing flow field designs to achieve improved PEMFC performance.展开更多
目的探讨采用Ribbed股骨柄假体行人工全髋关节置换术(total hip arthroplasty,THA)的中远期疗效。方法回顾分析2006年10月—2016年5月采用Ribbed股骨柄假体行THA且获完整随访的354例(384髋)髋关节疾病患者临床资料。男171例,女183例;年...目的探讨采用Ribbed股骨柄假体行人工全髋关节置换术(total hip arthroplasty,THA)的中远期疗效。方法回顾分析2006年10月—2016年5月采用Ribbed股骨柄假体行THA且获完整随访的354例(384髋)髋关节疾病患者临床资料。男171例,女183例;年龄20~82岁,平均53.4岁。单髋324例,双髋30例。关节置换原因:股骨头缺血性坏死151例(159髋),髋关节骨关节炎134例(136髋),类风湿性关节炎43例(43髋),强直性脊柱炎20例(40髋),创伤6例(6髋)。术前患者Harris评分为(42.34±8.89)分。术后采用Harris评分评价髋关节功能;摄X线片判断双下肢是否等长、股骨侧有无透亮带、假体稳定性以及应力遮挡发生情况。结果术后切口均Ⅰ期愈合。354例患者均获随访,随访时间2~11年,平均7.4年。末次随访时Harris评分为(80.52±7.61)分,与术前比较差异有统计学意义(t=134.804,P=0.000)。术后发生2例(2髋)假体感染,3例(3髋)假体松动,4例(4髋)假体周围骨折,48例(48髋)存在轻到中度大腿疼痛。X线片示76例(78髋)股骨侧存在透亮线以及不同程度应力遮挡。按照Engh等的方法评价假体稳定性,骨长入性稳定364髋,纤维长入性稳定15髋,假体不稳定5髋。25例(25髋)发生股骨柄假体下沉,其中5例患者双下肢长度差异>10 mm。结论采用Ribbed股骨柄假体行THA具有初始稳定性好、骨长入好等优点,术后应力遮挡发生率相对较高,但对假体中远期生存率和疗效无明显影响。展开更多
The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental ...The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental and theoretical evaluations of the Bragg grating are demonstrated. By thinning the SOl device layer and deeply etching the Bragg grating, a large grating coupling coefficient of 30cm^-1 is obtained.展开更多
基金Sponsored by National Natural Science Foundation of China(51075031,50675021)
文摘The ribbing problem has serious influence on the steel product quality, which produces additional shape waves on the surface of uncoiled steel strip on the process of curl. Nonlinear spline finite element method （n-spline FEM） is adopted to establish the relationship between the ribbing height and deflection of additional shape wave, for example, post buckling deformation. The proposed spline FEM is more effective and convenient than traditional finite element method in the buckling analysis. Using the spline FEM, the shape wave caused by the ribbing is calculated, and then the ribbing values can be obtained which are difficult to measure in practice. At the same time, the judgment rule is also given for estimating the strip quality according to the ribbing value.
文摘BACKGROUND Slipping rib syndrome(SRS)is caused by abnormal subluxation of floating ribs,resulting in chronic pain and possible tissue damage.Its prevalence is often overlooked,as it shares symptoms with other musculoskeletal conditions,and is more common in young females and athletes.Symptoms include pain along the lower rib margin,aggravated by trunk movements,deep breathing and coughing.Treatment usually starts conservatively with physiotherapy and analgesics.In severe cases,extrapleural rib resection may be required.CASE SUMMARY In April 2023,a 24-year-old woman presented with persistent right hemithorax pain in the eleventh rib for one year.Instrumental examinations,including ultrasonography and magnetic resonance imaging,were negative for abdominal and osteochondral abnormalities.The pain intensity,rated 8/10 on the numeric rating scale(NRS),remained unresponsive to pain therapy.After a careful literature review and discussion with the patient,we opted for a minimally invasive surgical approach.Under general anesthesia,a mini-thoracotomy was performed along the anterior course of the eleventh rib.After exposure,abnormal rib mobility was detected,which led to resection of the medial margin and anchoring to the overlying rib with nonabsorbable sutures.Histological examination revealed no abnormalities.The patient was discharged on the first postoperative day.Pain decreased significantly,reaching 1/10 on the NRS at one month.At 3 months,the patient had mild fluctuating pain(2/10)requiring occasional analgesics but did not interfere with daily activities.CONCLUSION Minimally invasive rib-preserving surgery effectively reduces pain and hospitalization time,offering a valid alternative to conventional rib resection for refractory SRS.
基金support from National Key Research and Development Program of China(2023YFC3905400)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA0490102)National Natural Science Foundation of China(22178354,2242100322408374).
文摘Integrating Bayesian Optimization with Volume of Fluid (VOF) simulations, this work aims to optimize the operational conditions and geometric parameters of T-junction microchannels for target droplet sizes. Bayesian Optimization utilizes Gaussian Process (GP) as its core model and employs an adaptive search strategy to efficiently explore and identify optimal combinations of operational parameters within a limited parameter space, thereby enabling rapid optimization of the required parameters to achieve the target droplet size. Traditional methods typically rely on manually selecting a series of operational parameters and conducting multiple simulations to gradually approach the target droplet size. This process is time-consuming and prone to getting trapped in local optima. In contrast, Bayesian Optimization adaptively adjusts its search strategy, significantly reducing computational costs and effectively exploring global optima, thus greatly improving optimization efficiency. Additionally, the study investigates the impact of rectangular rib structures within the T-junction microchannel on droplet generation, revealing how the channel geometry influences droplet formation and size. After determining the target droplet size, we further applied Bayesian Optimization to refine the rib geometry. The integration of Bayesian Optimization with computational fluid dynamics (CFD) offers a promising tool and provides new insights into the optimal design of microfluidic devices.
基金funded by the Sichuan Natural Science Foundation,grant number 2023NSFSC0870.
文摘In this work,numerical simulations are performed to investigate the influence of combining ribs and triangular cavities on the thermal-hydraulic performance(THP)of MCHS at fluid velocities ranging from1 to 4 m/s(corresponding to Reynolds numbers(Re)of 129.75 to 519).Specifically,the ribs are positioned on the bottomwall,and the rib width is equal to the mini-channel width,while the triangular cavities are arranged on the two side walls of the MCHS.By analyzing and comparing key parameters such as velocity distribution,streamline patterns,pressure drop,skin friction coefficient(C_(f)),Nusselt number(Nu),friction factor(f),temperature fields,and performance evaluation criterion(PEC),the advantages of rib-cavity coupling configuration in enhancing THP are systematically discussed.Furthermore,the effects of cavity distribution(left,middle,and right),cavity depth(0.04,0.06,and 0.08 mm),and rib height(0.02,0.04,and 0.06 mm)on THP are analyzed to optimize the geometric parameters of the ribs and the cavities.The numerical simulation results indicate that,in comparison to the use of ribs or cavities alone,rib-cavity coupling can further improve the THP ofMCHS without causing a significant increase in pressure drop.The downstreamwall of the cavity is perpendicular to the flow direction which is more favorable for enhancing the heat transfer performance.Increasing the cavity depth improves the heat transfer performance ofMCHS,themaximumNu ratio increase by 35%at a rib height of 0.06 mm.However the increase in the rib height leads to a significant increase in the pressure drop,which in turn exerts a negative impact on THP,a maximumPEC of 1.198 is obtained at a rig height of 0.02 mm.The greatest improvement in THP,reaching 19.8%,is achieved when the cavity depth is 0.08 mm and the rib height is 0.02 mm.
文摘Squeezing phenomena can lead to severe loads in deep tunnels,especially in the presence of a low ratio of surrounding rock strength to overburden pressure.For this reason,it is highly imperative to analyze and identify a suitable methodology to estimate the squeezing potential and select a proper support system of rock mass.This study aims to reveal the causes of failure of Tishreen tunnel in the west of Syria and develop remediation measures accordingly so as to bring the tunnel back into service.The tunnel in question was subjected to successive failures such as buckling and spalling of side walls,floor heave,and extremely large convergence reaching the failure state of the tunnel lining.In this study,an effective way was demonstrated to evaluate the squeezing potential of the tunnel lining and appropriate modeling of the long-term response of a tunnel excavated in weak rock.Specifically,the causes of failure of Tishreen tunnel were first evaluated by empirical approaches.Then,a numerical model was developed using a timedependent constitutive model to investigate the time-dependent response of the tunnel lining.On this basis,this study proposed an effective reinforcement schemes including steel ribs,grout injection,ground anchors,and new lining of reinforced concrete.The results show that the Burger viscoplastic model simulates effectively the resulting deformation and creep behavior of squeezing ground.It is also observed that using a combined heavy support system can provide efficient control over squeezing deformation and maintain the serviceability of the tunnel under study.
基金supported by the National Key Research and Development Program of China(No.2023YFC2907501)the National Natural Science Foundation of China(No.52374106)+1 种基金the China Postdoctoral Science Foundation(Grant no.2024T171006)the National Natural Science Foundation of China(Grant no.52204163).
文摘Rib spalling is a highly severe issue during mining in deep-buried large-mining-height working faces.This study takes Zhaogu No.2 Coal Mine in Jiaozuo Coalfield,China,as the research background and carries out three focused works to address this problem.Firstly,field measurements were conducted to clarify rib spalling characteristics:the coal wall is dominated by shear failure,internal cracks are mainly distributed 3–6 m above the coal wall surface,and the maximum depth of crack development reaches 3 m.Secondly,Universal Distinct Element Code(UDEC)numerical simulation software was used to build a rib spalling model,with the Trigon model adopted to divide the coal wall into blocks.Analysis of four key factors shows that increased buried depth and mining height significantly raise the total length of coal wall internal cracks,increasing rib spalling risk,while higher coal body strength and support strength effectively alleviate this phenomenon.Finally,an orthogonal experiment was designed to quantitatively determine the influence degree of the four factors on rib spalling.Results show that coal body strength has the greatest impact,followed by support strength,mining height,and mining depth in order of influence.This study provides valuable theoretical guidance for on-site prevention and control of coal wall rib spalling.
文摘Background: Reconstruction of Nasal Tip Columella (NTC) subunits is one of the most challenging aspects in functional aesthetic rhinoplasty. Moreover, racial variation for Asian nose rhinoplasty could even demand sophistication of tip and columella strut graft infrastructure enhancement. Various autogenous graft options such as 6th costal cartilage, septal cartilage and conchal cartilage are very commonly considered whilst the 10th costal cartilage is scarcely reported. Objective and Method: The purpose of this manuscript is to illustrate the detailed operative steps to harvest the 10th costal cartilage for infrastructural grafting at NTC subunits by a case illustration. The pros and cons of different cartilage options will be discussed, particularly its application in cleft nose rhinoplasty in Chinese patient. We have adopted the 10th rib as the key option for NTC reconstruction in 11 cases of Chinese cleft secondary rhinoplasty since 2019 and have achieved good and stable results without complications. Conclusion: The 10th costal cartilage is one of the best options in Nasal Tip Columella subunits reconstruction, particularly in complex cleft nose or failure revision aesthetic rhinoplasty cases, due to its safety of harvesting, and the sufficient quality and quantity of grafting materials it provides for simultaneous adjunctive augmentation purpose.
文摘Objective:To compare the diagnostic value of 99mTc-MDP SPECT/CT and MSCT in detecting thoracic wall and rib involvement in lung adenocarcinoma.Methods:A retrospective analysis was conducted on the imaging data of 78 thoracic wall and rib lesions from 66 patients,a total of 32 males and 34 females,aged(53.2±5.6)years old with pathologically confirmed lung adenocarcinoma who underwent both 99mTc-MDP SPECT/CT and MSCT examinations from March 2017 to September 2023.The diagnostic efficacy of the two imaging modalities was compared using pathological confirmation or clinical follow-up as the gold standard.Results:Pathological confirmation or clinical follow-up revealed 74 lesions with thoracic wall bone involvement in lung adenocarcinoma(20 lesions confirmed by surgical pathology and 54 lesions confirmed by clinical follow-up)and 4 lesions without thoracic wall or rib involvement(2 lesions confirmed by surgical pathology and 2 lesions confirmed by clinical follow-up).The diagnostic sensitivity,specificity,and accuracy of 99mTc-MDP SPECT/CT were 97.3%,50.0%,and 94.9%,respectively.Its diagnostic sensitivity and accuracy were higher than those of MSCT(72.3%and 74.4%,respectively),with statistically significant differences(P<0.05).The specificity of 99mTc-MDP SPECT/CT was lower than that of MSCT(100.0%),but the difference was not statistically significant(P<0.05).There were no statistically significant differences in the positive predictive value and negative predictive value between 99mTc-MDP SPECT/CT and MSCT(P>0.05).99mTc-MDP SPECT/CT examination revised the MSCT tumor staging in 14 patients[21.2%(14/66)]with lung adenocarcinoma.Conclusion:99mTc-MDP SPECT/CT imaging demonstrates superior diagnostic efficacy compared to MSCT in detecting thoracic wall and rib involvement in lung adenocarcinoma.It offers more accurate tumor staging than MSCT,and an accurate diagnosis aids in clinical treatment decision-making.
基金Supported by National Natural Science Foundation of China(Grant No.U21A20131)Innovative Research Team Development Program of Ministry of Education of China(Grant No.IRT17R83)111 Project(Grant No.B17034)。
文摘To improve braking performance and achieve lightweight in transport equipment,it is necessary to implement overall plastic forming manufacturing of the brake pad baseboard(BPB),which is the core safety component of the brake system.This study presents an innovative multi-DOF envelope forming(MDFEF)process to realize the plastic forming of BPB with thin skin and high reinforcing ribs.The MDFEF principle for BPB,and the design methods for the envelope mold are first presented.Through FE simulations,the behavior of metal flow,uneven growth pattern of reinforcing ribs,evolution of equivalent strain and evolution of forming force in MDFEF of BPB are investigated.To realize MDFEF,an innovative MDFEF equipment driven by parallel linkages is exploited.The force states of linkages in MDFEF are calculated,and the reasonable mold position is determined to reduce the maximum force on the linkages and improve the service performance of MDFEF equipment.The MDFEF experiments of BPB are conducted and qualified BPB is obtained,which demonstrates that the presented MDFEF process and equipment are applicable to manufacture BPB with thin skin and high reinforcing ribs.
基金the financial support of Natural Science Foundation of Hunan Province(2023JJ40261).
文摘The mass transport and ohmic losses in proton exchange membrane fuel cells(PEMFCs)is significantly influenced by the channel to rib width ratio(CRWR),particularly when accounting for the interfacial contact resistance between bipolar plates(BPs)and gas diffusion layers(GDLs)(ICRBP-GDL).Both the determination of the optimal CRWR value and the development of an efficient flow field structure are significantly influenced by ICRBP-GDLs.To investigate this,three-dimensional numerical models were developed,revealing that selecting an optimal CRWR tailored to specific ICRBP-GDL values can effectively balance mass transport and ohmic losses.Building on this insight,a novel island two-dimensional flow field design is proposed,demonstrating the ability to enhance oxygen transport to the catalyst layer(CL)and achieve a more uniform oxygen distribution without increasing ohmic losses.Compared to conventional straight and serpentine flow fields,the island flow field improves output power density by 4.5%and 3.5%,respectively,while reducing the liquid water coverage ratio by 30%.Additionally,the study identifies optimal CRWR values for conventional flow fields corresponding to ICRBP-GDLs of 2.5,5,10,20,and 40 mΩ·cm^(2) as 1.5,1.5,1.0,0.67,and 0.43,respectively.For the island flow field,the optimal CRWRs are consistently smaller-1.5,1.0,0.67,0.43,and 0.43-due to its superior mass transfer capability.This work provides a valuable framework for optimizing flow field designs to achieve improved PEMFC performance.
文摘目的探讨采用Ribbed股骨柄假体行人工全髋关节置换术(total hip arthroplasty,THA)的中远期疗效。方法回顾分析2006年10月—2016年5月采用Ribbed股骨柄假体行THA且获完整随访的354例(384髋)髋关节疾病患者临床资料。男171例,女183例;年龄20~82岁,平均53.4岁。单髋324例,双髋30例。关节置换原因:股骨头缺血性坏死151例(159髋),髋关节骨关节炎134例(136髋),类风湿性关节炎43例(43髋),强直性脊柱炎20例(40髋),创伤6例(6髋)。术前患者Harris评分为(42.34±8.89)分。术后采用Harris评分评价髋关节功能;摄X线片判断双下肢是否等长、股骨侧有无透亮带、假体稳定性以及应力遮挡发生情况。结果术后切口均Ⅰ期愈合。354例患者均获随访,随访时间2~11年,平均7.4年。末次随访时Harris评分为(80.52±7.61)分,与术前比较差异有统计学意义(t=134.804,P=0.000)。术后发生2例(2髋)假体感染,3例(3髋)假体松动,4例(4髋)假体周围骨折,48例(48髋)存在轻到中度大腿疼痛。X线片示76例(78髋)股骨侧存在透亮线以及不同程度应力遮挡。按照Engh等的方法评价假体稳定性,骨长入性稳定364髋,纤维长入性稳定15髋,假体不稳定5髋。25例(25髋)发生股骨柄假体下沉,其中5例患者双下肢长度差异>10 mm。结论采用Ribbed股骨柄假体行THA具有初始稳定性好、骨长入好等优点,术后应力遮挡发生率相对较高,但对假体中远期生存率和疗效无明显影响。
文摘The fabrication of Bragg gratings on silicon-on-insulator （SOI） rib waveguides using electron-beam lithography is presented. The grating waveguide is optimally designed for actual photonic integration. Experimental and theoretical evaluations of the Bragg grating are demonstrated. By thinning the SOl device layer and deeply etching the Bragg grating, a large grating coupling coefficient of 30cm^-1 is obtained.
