科创中国

针对为胶囊内窥镜供能的无线能量传输技术在应用过程中对人体组织可能造成伤害的问题,进行了无线能量传输系统发射线圈优化设计研究.分析了人体组织安全性与无线能量传输系统发射线圈之间的关系,提出用磁场均匀度、频率稳定度等指标来评价发射线圈性能,并建立了以能量传输效率为目标函数、以人体安全性和能量需求为约束条件的最优化模型.该模型可用来全面评价发射线圈性能,从而为发射线圈的设计提供依据.采用上述方法对4种类型的发射线圈进行了评价,评价结果证明了该方法的可行性.

Further development of the photovoltaic industry is restricted by the productivity of mono-crystalline silicon technology due to its requirements of low cost and high efficient photocells.The heat shield is not only the important part of the thermal field in Czochralski(Cz)mono-crystalline silicon furnace,but also one of the most important factors influencing the silicon crystal growth.Large-diameter Cz-Si crystal growth process is taken as the study object.Based on FEM numerical simulation,different heat shield structures are analyzed to investigate the heater power,the melt-crystal interface shape,the argon flow field,and the oxygen concentration at the melt-crystal interface in the process of large Cz-Si crystal growth.The impact of these factors on the growth efficiency and crystal quality are analyzed.The results show that the oxygen concentration on the melt-crystal interface and the power consumption of the heater stay high due to the lack of a heat shield in the crystal growth system.Argon circumfluence is generated on the external side of the right angle heat shield.By the right-angle heat shield,the speed of gas flow is lowered on the melt free surface,and the temperature gradient of the free surface is increased around the melt-crystal interface.It is not conducive for the stable growth of crystal.The shape of the melt-crystal interface and the argon circulation above the melt free surface are improved by the inclined heat shield.Compared with the others,the system pulling rate is increased and the lowest oxygen concentration is achieved at the melt-crystal interface with the composite heat shield.By the adoption of the optimized composite heat shield in experiment,the real melt-crystal interface shapes and its deformation laws obtained by Quick Pull Separation Method at different pulling rates agree with the simulation results.The results show that the method of simulation is feasible.The proposed research provides the theoretical foundation for the thermal field design of the large diameter Cz-Si monocrystalline growth.

Steering control of a capsule robot in curve environment by magnetic navigation is not yet solved completely.A petal-shaped capsule robot with less steering resistance based on multiple wedge effects is presented,and an optimization method with two processes for determining the orientation of a pre-applied universal magnetic spin vector is proposed.To realize quick and non-contact steering swimming,a fuzzy comprehensive evaluation method for optimizing the steering driving angle is presented based on two evaluation indexes including the average steering speed and the average steering trajectory deviation,achieving the initial optimal orientation of a universal magnetic spin vector.To further reduce robotic magnetic vibration,a main target method for optimizing its final orientation,which is used for fine adjustment,is employed under the constrains of the magnetic moments.Swimming experimental results in curve pipe verified the effectiveness of the optimization method,which can be effectively used to realize non-contact steering swimming of the petal-shaped robot and reduce its vibration.

选择IGC(产业梯度系数)作为衡量区域产业梯度水平的指标,通过计算豫沪苏浙产业梯度系数,结合国情、省情,明确在"十二五"期间,河南省宜承接的工业产业.

The existing research of the acceleration control mainly focuses on an optimization of the velocity trajectory with respect to a criterion formulation that weights acceleration time and fuel consumption. The minimum-fuel acceleration problem in conventional vehicle has been solved by Pontryagin's maximum principle and dynamic programming algorithm, respectively. The acceleration control with minimum energy consumption for battery electric vehicle(EV) has not been reported. In this paper, the permanent magnet synchronous motor(PMSM) is controlled by the field oriented control(FOC) method and the electric drive system for the EV(including the PMSM, the inverter and the battery) is modeled to favor over a detailed consumption map. The analytical algorithm is proposed to analyze the optimal acceleration control and the optimal torque versus speed curve in the acceleration process is obtained. Considering the acceleration time, a penalty function is introduced to realize a fast vehicle speed tracking. The optimal acceleration control is also addressed with dynamic programming(DP). This method can solve the optimal acceleration problem with precise time constraint, but it consumes a large amount of computation time. The EV used in simulation and experiment is a four-wheel hub motor drive electric vehicle. The simulation and experimental results show that the required battery energy has little difference between the acceleration control solved by analytical algorithm and that solved by DP, and is greatly reduced comparing with the constant pedal opening acceleration. The proposed analytical and DP algorithms can minimize the energy consumption in EV's acceleration process and the analytical algorithm is easy to be implemented in real-time control.

电机温升对电机的性能有重要影响,是电机设计的关键.基于流体动力学原理,对矿用防爆电机的热流耦合场进行数值计算,得到了电机内部流场特性、电机整体温度分布、电机各部件峰值温度及所在位置.通过方案比较,确定定、转子铁心长度;然后进行结构优化,采用电机内置风扇、定转子铁心增设通风孔两种方法增强电机内部冷却效果,并验证数值计算的可行性.所得结论为电机设计提供了一定的理论参考.

目的通过分析磁共振T1WI-SPIR序列半月板撕裂的征象并与关节镜结果对比以探讨其在半月板撕裂诊断中的临床应用价值.方法回顾性分析45例经关节镜证实的半月板撕裂病人T1WI-SPIR表现并与关节镜结果对比.结果45例90个半月板T1WI-SPIR诊断撕裂70个,关节镜证实50个,MR敏感性100%,准确率71%.结论磁共振T1WI-SPIR序列诊断半月板撕裂较为敏感,但存在一定假阳性.

利用第一性原理方法研究了一系列正交结构锰酸盐Gd1-xHoxMnO3(0.0≤x≤0.5)的电子结构和磁学性质.我们研究的所有组分的Gd1xHoxMnO3都能保持单一的立方结构,单胞的体积也随着x的增大线性减小,Mn -O - Mn键的键角也随着Ho的掺杂而线性的减小.我们的磁属性研究表明随着Ho的掺杂反铁磁-E相变越来越稳定,Mn的磁矩随着x的增大基本不变.

目的研究急性胰腺炎磁共振严重度指数(MR Severity Index,MRSI)与急性生理与慢性健康状况评分系统(the Acute Playsiology And Chronic Healthy Evaluation,APACHEⅡ)之间的相关性,探讨是否可以利用MRSI来评估急性胰腺炎的严重程度.方法回顾性分析119例急性胰腺炎患者的MRI表现.每侧AP息者在MR上的严重程度用MR严重程度指数(MR Severity score iridex,MRSI)进行分级,MRSI 0-2分为轻型,3-6分中度,7-10分为重型.同时根据患者的临床和实验室参数对每例患者行APACHEⅡ评分,并对MRSI与APACHEⅡ评分进行相关性分析.结果根据MRSI,119例急性胰腺炎中,轻型急性胰隙炎48例,中度59例,重症急性胰腺炎12例.53例APACHEⅡ≤7分,66例APACHEⅡ≥8分.MRSI与APACHEⅡ评分存在弱的正相关关系(r=0.314,P〈0.01).结论MRSI能在一定程度上反映急性胰腺炎的临床严重程度,应纳入全面评价急性严重程度的评价体系中.