LED UV油墨利用LED光源进行光固化,光扩散粉可快速固化,在紫外光的照射下迅速发生聚合反应。将光扩散粉高分子结晶材料加入乳液合成的LED UV光固化树脂中,利用两者的有效结合,达到理想的光扩散。光固化工艺保证显示面板膜层更稳定,减少...LED UV油墨利用LED光源进行光固化,光扩散粉可快速固化,在紫外光的照射下迅速发生聚合反应。将光扩散粉高分子结晶材料加入乳液合成的LED UV光固化树脂中,利用两者的有效结合,达到理想的光扩散。光固化工艺保证显示面板膜层更稳定,减少原材料消耗,降低了生产成本。展开更多
Boundary layer suction is an e ective method used to delay separations in axial compressors. Most studies on bound?ary layer suction have focused on improving the performance of compressors,whereas few studies investi...Boundary layer suction is an e ective method used to delay separations in axial compressors. Most studies on bound?ary layer suction have focused on improving the performance of compressors,whereas few studies investigated the influence on details of the flow fields,especially vortexes in compressors. CFD method is validated with experi?mental data firstly. Three single?slot and one double?slot endwall boundary layer suction schemes are designed and investigated. In addition to the investigation of aerodynamic performance of the cascades with and without suction,variations in corner open separation,passage vortex,and concentration shedding vortex,which are rarely seen for the flow controlled blades in published literatures,are analyzed. Then,flow models,which are the ultimate aim,of both baseline and aspirated cascades are established. Results show that single?slot endwall suction scheme adjacent to the suction surface can e ectively remove the corner open separation. With suction mass flow rate of 0.85%,the overall loss coe cient and endwall loss coe cient of the cascade are reduced by 25.2% and 48.6%,respectively. Besides,this scheme increases the static pressure rise coe cient of the cascade by 3.2% and the flow turning angle of up to 3.3° at 90% span. The concentration shedding vortex decreases,whereas the passage vortex increases. For single?slot suction schemes near the middle pitchwise of the passage,the concentration shedding vortex increases and the passage vortex is divided into two smaller passage vortexes,which converge into a single?passage vortex near the trailing edge section of the cascade. For the double?slot suction scheme,triple?passage vortexes are presented in the blade passage. Some new vortex structures are discovered,and the novel flow models of aspirated compressor cascade are proposed,which are important to improve the design of multi?stage aspirated compressors.展开更多
There have been many theoretical studies and numerical investigations of nonlocal diffusion(ND)problems in recent years.In this paper,we propose and analyze a new discontinuous Galerkin method for solving one-dimensio...There have been many theoretical studies and numerical investigations of nonlocal diffusion(ND)problems in recent years.In this paper,we propose and analyze a new discontinuous Galerkin method for solving one-dimensional steady-state and time-dependent ND problems,based on a formulation that directly penalizes the jumps across the element interfaces in the nonlocal sense.We show that the proposed discontinuous Galerkin scheme is stable and convergent.Moreover,the local limit of such DG scheme recovers classical DG scheme for the corresponding local diff usion problem,which is a distinct feature of the new formulation and assures the asymptotic compatibility of the discretization.Numerical tests are also presented to demonstrate the eff ectiveness and the robustness of the proposed method.展开更多
In this paper,we deal with some fast di usion equations ut=um+au vp and vt=△v^n+bu^qv^βsubject to null Dirichlet boundary conditions.We prove that every solution vanishes in nite time for pq>(m-α)(n-β),m>αa...In this paper,we deal with some fast di usion equations ut=um+au vp and vt=△v^n+bu^qv^βsubject to null Dirichlet boundary conditions.We prove that every solution vanishes in nite time for pq>(m-α)(n-β),m>αand n>β,where the exact relation of initial data is determined with the aid of some Sobolev Embedding inequalities.If pd<(m-α)(n-β),m>αand n>β,we show the barriers of the initial data which lead to the non-extinction of solutions.For the case pq=(m-α)(n-β),the solutions vanish for small initial data.The results fill in a gap for the case pq<mn in Nonlinear Anal.Real World Appl.4(2013)1931-1937.The coecients a and b play a vital role in the existence of non-extinction weak solution provided that a and b are large enough.At last,we use the scaling methods to determine some exponent regions where one of the components would blow up alone for some suitable initial data.展开更多
Objective To present the operative results of 17patients with atlantoaxial diseases using transoral approach.Methods17patients received operation of atlantoaxial fusion using transoral approach.The average age is 27ye...Objective To present the operative results of 17patients with atlantoaxial diseases using transoral approach.Methods17patients received operation of atlantoaxial fusion using transoral approach.The average age is 27years old(12～47years).Results All patients had achieved primary healing without any complications.The fusion rate was100%.The average recovery rate(JOAscore system)of myelopathy was48%.Conclusions Transoral approach was an ideal approach for upper cervical diseases.The infection rate could be lowered dow n to the minimum if the patients were properly managed perioperatively.Atlantoaxial fu sion could be achieved through this a pproach without instrumentation.展开更多
Computational models that ensure accurate and fast responses to the variations in operating conditions,such as the cell tem-perature and relative humidity(RH),are essential monitoring tools for the real-time control o...Computational models that ensure accurate and fast responses to the variations in operating conditions,such as the cell tem-perature and relative humidity(RH),are essential monitoring tools for the real-time control of proton exchange membrane(PEM)fuel cells.To this end,fast cell-area-averaged numerical simulations are developed and verifi ed against the present experiments under various RH levels.The present simulations and measurements are found to agree well based on the cell voltage(polarization curve)and power density under variable RH conditions(RH=40%,RH=70%,and RH=100%),which verifi es the model accuracy in predicting PEM fuel cell performance.In addition,computationally feasible reduced-order models are found to deliver a fast output dataset to evaluate the charge/heat/mass transfer phenomena as well as water production and two-phase fl ow transport.Such fast and accurate evaluations of the overall fuel cell operation can be used to inform the real-time control systems that allow for the improved optimization of PEM fuel cell performance.展开更多
目的了解人工全膝关节置换术后1年以上老年骨性关节炎患者的生活质量,并分析其影响因素。方法采用一般情况调查表、美国纽约特种外科医院(Hospital for Special Surgery,HSS)的膝关节恢复评分表、健康状况调查问卷(SF-36)及社会支持评...目的了解人工全膝关节置换术后1年以上老年骨性关节炎患者的生活质量,并分析其影响因素。方法采用一般情况调查表、美国纽约特种外科医院(Hospital for Special Surgery,HSS)的膝关节恢复评分表、健康状况调查问卷(SF-36)及社会支持评定量表,对2009年5月至2011年5月哈尔滨医科大学附属第一临床医学院收治的150例人工全膝关节置换术后患者进行调查。结果人工膝关节置换术后患者的生活质量较正常人群低(均P<0.01);多元回归分析表明,患者在躯体健康方面的生活质量与年龄、其他疾病史呈负相关(P<0.05或P<0.01),与HSS评分呈正相关(P<0.05);在精神健康方面的生活质量与婚姻状况、家庭关系、经济收入、文化程度及社会支持利用度呈正相关(P<0.05或P<0.01)。结论人工膝关节置换术后患者的生活质量降低,应采取针对性的护理干预措施,同时提供有效的社会支持,进而提高其生活质量。展开更多
基金Supported by China Postdoctoral Science Foundation(Grant No.2016M600015)National Natural Science Foundation of China(Grant Nos.51741601,51236006)
文摘Boundary layer suction is an e ective method used to delay separations in axial compressors. Most studies on bound?ary layer suction have focused on improving the performance of compressors,whereas few studies investigated the influence on details of the flow fields,especially vortexes in compressors. CFD method is validated with experi?mental data firstly. Three single?slot and one double?slot endwall boundary layer suction schemes are designed and investigated. In addition to the investigation of aerodynamic performance of the cascades with and without suction,variations in corner open separation,passage vortex,and concentration shedding vortex,which are rarely seen for the flow controlled blades in published literatures,are analyzed. Then,flow models,which are the ultimate aim,of both baseline and aspirated cascades are established. Results show that single?slot endwall suction scheme adjacent to the suction surface can e ectively remove the corner open separation. With suction mass flow rate of 0.85%,the overall loss coe cient and endwall loss coe cient of the cascade are reduced by 25.2% and 48.6%,respectively. Besides,this scheme increases the static pressure rise coe cient of the cascade by 3.2% and the flow turning angle of up to 3.3° at 90% span. The concentration shedding vortex decreases,whereas the passage vortex increases. For single?slot suction schemes near the middle pitchwise of the passage,the concentration shedding vortex increases and the passage vortex is divided into two smaller passage vortexes,which converge into a single?passage vortex near the trailing edge section of the cascade. For the double?slot suction scheme,triple?passage vortexes are presented in the blade passage. Some new vortex structures are discovered,and the novel flow models of aspirated compressor cascade are proposed,which are important to improve the design of multi?stage aspirated compressors.
基金Q.Du’s research is partially supported by US National Science Foundation Grant DMS-1719699,US AFOSR MURI Center for Material Failure Prediction Through Peridynamics,and US Army Research Office MURI Grant W911NF-15-1-0562.L.Ju’s research is partially supported by US National Science Foundation Grant DMS-1818438.J.Lu’s research is partially supported by Postdoctoral Science Foundation of China Grant 2017M610749.X.Tian’s research is partially supported by US National Science Foundation Grant DMS-1819233.
文摘There have been many theoretical studies and numerical investigations of nonlocal diffusion(ND)problems in recent years.In this paper,we propose and analyze a new discontinuous Galerkin method for solving one-dimensional steady-state and time-dependent ND problems,based on a formulation that directly penalizes the jumps across the element interfaces in the nonlocal sense.We show that the proposed discontinuous Galerkin scheme is stable and convergent.Moreover,the local limit of such DG scheme recovers classical DG scheme for the corresponding local diff usion problem,which is a distinct feature of the new formulation and assures the asymptotic compatibility of the discretization.Numerical tests are also presented to demonstrate the eff ectiveness and the robustness of the proposed method.
基金Supported by Shandong Provincial Natural Science Foundation of China。
文摘In this paper,we deal with some fast di usion equations ut=um+au vp and vt=△v^n+bu^qv^βsubject to null Dirichlet boundary conditions.We prove that every solution vanishes in nite time for pq>(m-α)(n-β),m>αand n>β,where the exact relation of initial data is determined with the aid of some Sobolev Embedding inequalities.If pd<(m-α)(n-β),m>αand n>β,we show the barriers of the initial data which lead to the non-extinction of solutions.For the case pq=(m-α)(n-β),the solutions vanish for small initial data.The results fill in a gap for the case pq<mn in Nonlinear Anal.Real World Appl.4(2013)1931-1937.The coecients a and b play a vital role in the existence of non-extinction weak solution provided that a and b are large enough.At last,we use the scaling methods to determine some exponent regions where one of the components would blow up alone for some suitable initial data.
文摘Objective To present the operative results of 17patients with atlantoaxial diseases using transoral approach.Methods17patients received operation of atlantoaxial fusion using transoral approach.The average age is 27years old(12～47years).Results All patients had achieved primary healing without any complications.The fusion rate was100%.The average recovery rate(JOAscore system)of myelopathy was48%.Conclusions Transoral approach was an ideal approach for upper cervical diseases.The infection rate could be lowered dow n to the minimum if the patients were properly managed perioperatively.Atlantoaxial fu sion could be achieved through this a pproach without instrumentation.
基金supported by the Guangxi Natural Science Foundation(Grant No.2022GXNSFAA035516)the National Natural Science Foundation of China(Grant No.11461009)the Important Natural Science Foun-dation of Colleges and Universities of Anhui Province(Grant No.KJ2020A0122).
基金by the Natural Sciences and Engineering Research Council of Canada(NSERC)via a Discovery Grant,Canadian Urban Transit Research and Innovation Consortium(CUTRIC)(No.160028).
文摘Computational models that ensure accurate and fast responses to the variations in operating conditions,such as the cell tem-perature and relative humidity(RH),are essential monitoring tools for the real-time control of proton exchange membrane(PEM)fuel cells.To this end,fast cell-area-averaged numerical simulations are developed and verifi ed against the present experiments under various RH levels.The present simulations and measurements are found to agree well based on the cell voltage(polarization curve)and power density under variable RH conditions(RH=40%,RH=70%,and RH=100%),which verifi es the model accuracy in predicting PEM fuel cell performance.In addition,computationally feasible reduced-order models are found to deliver a fast output dataset to evaluate the charge/heat/mass transfer phenomena as well as water production and two-phase fl ow transport.Such fast and accurate evaluations of the overall fuel cell operation can be used to inform the real-time control systems that allow for the improved optimization of PEM fuel cell performance.
文摘目的了解人工全膝关节置换术后1年以上老年骨性关节炎患者的生活质量,并分析其影响因素。方法采用一般情况调查表、美国纽约特种外科医院(Hospital for Special Surgery,HSS)的膝关节恢复评分表、健康状况调查问卷(SF-36)及社会支持评定量表,对2009年5月至2011年5月哈尔滨医科大学附属第一临床医学院收治的150例人工全膝关节置换术后患者进行调查。结果人工膝关节置换术后患者的生活质量较正常人群低(均P<0.01);多元回归分析表明,患者在躯体健康方面的生活质量与年龄、其他疾病史呈负相关(P<0.05或P<0.01),与HSS评分呈正相关(P<0.05);在精神健康方面的生活质量与婚姻状况、家庭关系、经济收入、文化程度及社会支持利用度呈正相关(P<0.05或P<0.01)。结论人工膝关节置换术后患者的生活质量降低,应采取针对性的护理干预措施,同时提供有效的社会支持,进而提高其生活质量。
