摘要：Structure of a rotor and other design parameters are all viewed as constant using finite element software to analyze reliability of the rotor. In this case,reliability analysis of the rotor can't be realized for design parameters as random. Based on theory of elastic mechanics,starting with the micro element of the rotor,stress formulas on arbitrary point of turbine disc with equal and variable thickness are deducted under the influence of centrifugal force and temperature field on rotor system simultaneously. Considering the random of structural size of the turbine rotor,temperature stress,rotating speed,external loads and material strength,the reliability of a rotor is studied with stress-strength interference model,integral stochastic finite element method(ISFEM) and Gram-Charlier series method,and random structural reliability of the rotor is computed with higher accuracy.

摘要：This paper presents a holistic methodology for the design of medical device software, which encompasses of a new way of eliciting requirements, system design process, security design guideline, cloud architecture design, combinatorial testing process and agile project management. The paper uses point of care diagnostics as a case study where the software and hardware must be robust, reliable to provide accurate diagnosis of diseases. As software and software intensive systems are becoming increasingly complex, the impact of failures can lead to significant property damage, or damage to the environment. Within the medical diagnostic device software domain such failures can result in misdiagnosis leading to clinical complications and in some cases death. Software faults can arise due to the interaction among the software, the hardware, third party software and the operating environment. Unanticipated environmental changes and latent coding errors lead to operation faults despite of the fact that usually a significant effort has been expended in the design, verification and validation of the software system. It is becoming increasingly more apparent that one needs to adopt different approaches, which will guarantee that a complex software system meets all safety, security, and reliability requirements, in addition to complying with standards such as IEC 62304. There are many initiatives taken to develop safety and security critical systems, at different development phases and in different contexts, ranging from infrastructure design to device design. Different approaches are implemented to design error free software for safety critical systems. By adopting the strategies and processes presented in this paper one can overcome the challenges in developing error free software for medical devices (or safety critical systems).

摘要：本文用脉冲激光沉积系统外延生长了LaMnO3(LMO)薄膜,研究了拉应力和压应力对薄膜磁学性质的影响,发现在拉应力和压应力的衬底上,外延生长这种A型反铁磁LMO薄膜,均可出现交换偏置现象.这是因为外应力导致衬底与薄膜界面处的MnO6氧八面体发生转动,从而使临近衬底的LMO薄膜下层出现了净磁矩表现铁磁性;而那些远离衬底的LMO薄膜上层则由于外应力的释放,仍保持原有的反铁磁性.因此,LMO薄膜中自发的交换偏置现象,源于铁磁性与反铁磁性之间的交换耦合作用.这种在单一LMO薄膜中实现交换偏置的现象,为自旋阀器件的优化设计提供了一种新方法.

摘要：具有出色电学响应和自供电能力的柔性可穿戴传感器已成为个人医疗保健和人机交互领域重要的研究方向.本文制备了一种基于摩擦纳米发电机的柔性自供电触觉传感器,由具有微四棱锥台结构的PDMS薄膜、铜电极以及P(VDF-TrFE)纳米纤维组成.在外部机械力刺激下,该传感器能通过接触-分离模式直接产生电学信号.MEMS工艺制备的均匀可控的微四棱锥台结构和静电纺丝制备的P(VDF-TrFE)纳米纤维,使得传感器展现出高灵敏度(2.97 V kPa^-1、高稳定性(超过40000次循环没有衰减)、快速响应(在1 Hz频率下60 ms)、低压力探测能力(重约35 mg,压强约为4 Pa的水滴)以及良好的线性度(在低压力区域为0.99231).PDMS薄膜的超柔韧性和优异的生物相容性,使得传感器能舒适地贴合在人体皮肤上.此外,所设计的传感器可以通过判断对应的电学响应信号识别各种人体运动类型.基于上述优势,该摩擦纳米发电机有望应用于姿态监测、健康评估以及人机交互等领域.

摘要：Space information network is used for real time acquiring, transmitting and processing the space information on the space platform, which provides significant communication services for communication, navigation positioning and science exploration. In this paper, the architecture of Software Defined Space Optical Network (SDSON) based on cloud platform is designed by means of Software Defined Optical Network (SDON) and cloud services. The new architecture combining centralized and distributed management-control mechanism is a multi-layer and multi-domain architecture with powerful computing and storage ability. Moreover, reliable service and unreliable service communication models employed in the space information network are proposed considering the characteristic of Disruption/Delay Tolerant Network (DTN). Finally, the functional verification and demonstration are performed on our optical experimental network platform.

摘要：A hybrid switching node structure with light and microwave links is proposed, which is applicable to the future data relay satellite systems, aiming at the development trend of coexistence of light- link and microwave-link in the future. An experimental system for the light and microwave hybrid switching node based on wavelength selective optical switches (WSS) and optical transceiver modules, is established. It is shown by our experiment that this hybrid switching node can realize the dynamic bandwidth allocation and wavelength routing while the bit error rate of light link is less than 10?12, which provides a method for solving the hybrid switching problem of light-link and microwave-link on the future data relay satellite systems.

摘要：二维范德华材料被广泛用作光分解水催化剂,但其直接的能量转化效率有待提高.因此,寻找具有高效光解水催化特性的二维材料成为理论和实验研究的热点.本文从量子力学第一性原理出发,预言了一类具有高效光解水特性的光催化剂:二维Ⅲ族硫化物Janus多层结构InGaXY,M2XY和InGaX2(M=In/Ga;X,Y=S/Se/Te).理论计算表明,多层材料的内建电场不仅可以促进光生载流子的空间分离,而且可以有效地调控材料能带的位置,提高能量转化效率.Janus多层材料能量转化效率的理论上限可以达到38.5%,接近了理论极限值(47%).更重要的是,在InGaSSe双层引入Ga空位可以有效降低析氢和析氧反应的过电势,仅仅依靠光生载流子提供的电压就可以驱动光解水催化反应.该理论结果不仅预言了二维Ⅲ族硫化物Janus多层材料可以作为高效的光解水催化材料,而且为设计和寻找高效光催化材料提供了新思路.

摘要：A new version of the scalar transverse electric(TE) wave equation in the bent waveguide is introduced. Then, TE polarized field in curved single-mode waveguides is analyzed by using the finite-difference beam propagation method(FD-BPM). The bending loss in bent waveguides is gotten for the optical fields obtained from BPM and comparisons are made among losses of the waveguides with various curvature radiuses, refractive index differences and cross sections. Based on the results, the design of spiral bent waveguide configuration is proposed as follows: refractive index difference being of 0.007, both width and thickness of waveguides being of 6 μm, the curvature radius in the spiral centre being of 4 mm, and the bending loss coefficient of the designed spiral bent waveguide being of 0.302 3 dB/cm.

摘要：This paper aims at designing a better network immunization strategy to fight against the Susceptible-Infected-Susceptible(SIS) type epidemic spreading in *** work used the number of drops in the spectral radius of the network for evaluation and guiding the design of immunization ***,we propose using the infected node number in the steady state of SIS spreading as the appropriate *** use the metric to point out the limitations of the Equal Graph Partitioning(EGP) strategy and the "max-Δλ" strategy,which are two representative network immunization strategies,and then identify the critical role of epidemic spreading parameters in the evaluation and design of network immunization *** on all of these,we design a new immunization *** results show that our strategy performs consistently better than the EGP *** many cases,it uses only 50% less resources to achieve the same immunization effect.

摘要：高效非贵金属催化剂对于推进析氢反应(HER)的大规模工业化至关重要.碳化钼(Mo_(2)C)因其类似铂的能带密度和优良的中间产物吸附特性,有望替代贵金属基材料成为具有前景的催化剂.然而,它在常规制备过程中存在严重的晶体过度生长和团聚问题,导致催化效率低.本研究利用三聚氰胺辅助法制备了含有丰富表面和界面的超细碳化钼/氮化钼(Mo_(2)C/Mo_(2)N)异质结构,并同时将其嵌入到氮掺杂碳纳米纤维(CNFs)中.Mo_(2)C/Mo_(2)N异质结构的协同作用与超细纳米晶表面暴露的丰富活性位点共同提高了电催化活性,而氮掺杂碳纳米纤维框架保证了快速的电荷转移和良好的结构稳定性.此外,原位形成的Mo_(2)C/Mo_(2)N晶体与碳基质之间存在较强的界面耦合作用,进一步提高了电子电导率和电催化活性.得益于这些优势,Mo_(2)C/Mo_(2)N@N-CNFs在碱性溶液中表现出优异的电催化析氢性能,在电流密度10 mV cm^(-2)时具有75 mV的低过电势,优于单相Mo_(2)C@N-CNFs对比样以及近期报道的Mo_(2)C/Mo_(2)N基催化剂.这个合成方法集成了异质结构、纳米化和碳修饰策略,为设计高效率电催化材料提供了新的参考.