摘要：Copper matrix composites(CMCs)offer promising applications by combining the functional characteristics of copper with composite *** the rapid advancement in aerospace,microelectronics,and intelligent terminal engineering,the demand for CMCs with superior mechanical and electrical properties has become increasingly *** paper reviews the design principles,preparation methods,microstructures and properties of some typical *** existing form of composite phases in the Cu matrix and their effects on microstructure evolution and comprehensive properties are *** underlying mechanisms governing these enhancements are *** results provide a systematic understanding of the relationship between reinforcement phases and properties,offering insights for the future development of CMCs aimed to achieve much better comprehensive *** paper concludes by outlining the development trends and future outlook for the application of CMCs.

摘要：In this study,we implement forward modeling and inversion based on deep-learning strategies using an optimal nearly analytic discrete(ONAD)*** forward-modeling method combines the ONAD method with recurrent neural network(RNN)for the fi rst *** is a type of neural network that is suitable for sequential data,which uses information from both previous and current times to obtain output *** express the ONAD method using an RNN framework to advance the time iteration of an acoustic *** process can simplify programming using RNN and convolution ***,we use deep learning based on the proposed forward-modeling method to study full waveform-inversion *** the main purpose of inversion is to minimize the error between real and synthetic data,inversion is essentially an optimization *** new optimizers are available in the framework of deep learning,such as the Adam and Nadam optimizers,which are used for optimizing velocity model in the inversion *** perform six numerical *** first two experiments demonstrate the forward-modeling results,which indicate that the forward-modeling method can effectively suppress numerical dispersion and improve computational effi *** other four experiments demonstrate the inversion results,which show that the method proposed in this paper can eff ectively realize inversion *** compare several optimizers used in deep learning and find that the Nadam optimizer has faster convergence and better effectiveness based on the ONAD method combined with RNN.

摘要：为有效提升网络服务能力,可扩展网络服务模型(ENSM)将网络服务内涵从承载网拓展到整个网络,定义了一种以协议元功能单元动态部署及动态组合为基础的统一服务扩展模型,可有效提高网络服务能力及服务扩展能力。本文基于ENSM原理提出服务动态扩展网络(SDEN),并结合SDN、NFV等新型网络架构设计思想对其结点模型及关键机制进行研究,设计并实现了SDEN结点系统,通过路由服务的定制和动态扩展,验证SDEN结点系统设计方案可行性及其对可扩展网络服务模型的良好支持。

摘要：针对GIS数据库的联动更新及其拓扑一致性维护困难的问题,提出一种基于拓扑联动的增量更新方法,其是针对不同目标类型,分析归纳出相应的拓扑联动类型及其细分类型;对不同目标发展根据其语义特点、拓扑一致性约束条件及变化前后目标间的拓扑关系来推断实体变化类型的规则,并以此为基础分析或推断出每种拓扑联动类型中原关联目标和新生目标的变化情况,进而设计和执行相应的更新操作实现数据库的局部联动更新及其拓扑一致性维护。全文以地籍数据库更新为例,将地籍变更分为地块合并、分割、公共边界调整、结点移动、复合分并5种基本联动类型,并对地块合并、分割、公共边界调整进行了细分,共分为17种细分类型;归纳出地块目标的变化类型推断规则,用实际与模拟数据对本文所提出的方法进行实验验证。本文所提出的方法为此类系统的设计与开发提供了一条新的思路。

摘要：针对某小型高速离心压气机叶轮的叶片厚度和子午流道线形进行改形,并利用商用软件Fine/Turbo对改形后的叶轮进行全三维数值计算.计算结果表明:经过优化的叶轮在设计点绝热效率提高2.4%,并且具有较高的稳定裕度.另外,将径流式叶轮改叶轮为斜流式可以减少叶轮出口区域的气流分离,但以降低其扩压能力为代价.

摘要：针对姿控式直接力/气动力复合控制拦截弹,提出一种基于干扰补偿和动态面方法的制导控制一体化(IGC)算法.首先设计一种适用于未知上界干扰的变增益扩张状态观测器(TVGESO),在有效保证估计精度的同时,能够减弱初始尖峰现象;然后考虑目标机动以及喷流扰动等模型不确定性,应用TVGESO在线干扰逼近补偿,基于积分滑模动态面方法设计了IGC算法;最后基于Lyapunov理论对闭环系统稳定性进行证明.数值仿真结果表明了所提出设计方案的有效性.

摘要：When the tunneling boring machine(TBM) cutterhead tunnels, the excessive vibration and damage are a severe engineering problem, thereby the anti-vibration design is a key technology in the disc cutter system. The structure of disc cutter contains many joint interfaces among cutter ring, cutter body, bearings and cutter shaft. On account of the coupling for dynamic contact and the transfer path among joint interface, mechanical behavior of disc cutter becomes extremely complex under the impact of heavy-duty, which puts forward higher requirements for disc cutter design. A multi-degree-of-freedom coupling dynamic model, which contains a cutter ring, a cutter body, two bearings and cutter shaft, is established, considering the external stochastic excitations, bearing nonlinear contact force, multidirectional mutual coupling vibration, etc. Based on the parameters of an actual project and the strong impact external excitations, the modal properties and dynamic responses are analyzed, as well as the cutter shaft and bearings' loads and load transmission law are obtained. Numerical results indicate the maximum radial and axial cutter ring amplitudes of dynamic responses are 0.568 mm and 0.112 mm; the maximum radial and axial vibration velocities are 41.1 mm/s and 38.9 mm/s; the maximum radial and axial vibration accelerations are 94.7 m/s2 and 58.6 m/s2; the maximum swing angle and angular velocity of cutter ring are 0.007° and 0.0074 rad/s, respectively. Finally, the maximum load of bearing roller is 40.3 k N. The proposed research lays a foundation for structure optimization design of disc cutter and cutter base, as well as model selection, modification and fatigue life of the cutter bearing.

摘要：To study the effects of perceived control on human thermal sensation and thermal comfort in heated environments,a psychological experiment was *** total,24 subjects participated in an *** experiment consisted of two cases in which the indoor temperature was set at 18℃ with different cold radiation *** experiment lasted for 120 min and was divided into three phases,adaptation,without perceived control and perceived *** the second phase,the subjects were told in advance that the indoor temperature could not be *** the third phase,subjects were told that they could adjust the indoor temperature to meet their own thermal expectations,but the indoor temperature could not actually be *** results showed that the effect of perceived control on thermal sensation was related to the thermal *** people with strong expectations for a neutral environment,perceived control improved their thermal sensation by satisfying their thermal *** people with low thermal expectations,perceived control reduced their thermal tolerance to the environment,eventually leading to thermal *** new findings provide more supports for the importance of psychological effects and a reference for the personal control of heating temperatures.

摘要：采用慢应变速率拉伸(SSRT)试验方法,研究了FeCrAl铁素体不锈钢在偏离压水堆正常工况下的应力腐蚀行为。结果表明,在含有微量Cu^(2+)与Cl^-的高温水介质中,应变速率为2×10^(-7) s^(-1)时,FeCrAl铁素体不锈钢将发生显著的应力腐蚀开裂;其在含Cu^(2+)和Cl^-的高温水介质中的应力腐蚀开裂主要由点蚀导致。

摘要：750 keV,201.25 MHz的射频四极注入器为四杆型,电极长度124 cm,共16个支撑板。根据加速器射频结构设计的结果进行了水冷管道的结构设计,理论分析了管路的流体力学特性和传热学特性。在忽略结构形变的情况下,利用射频计算软件的稳态热分析功能计算了加速腔的温度分布,降低了模拟计算的难度。计算结果表明:加速腔的最大温升控制在1 K以内,水冷系统能够使加速器在适宜的温度下长时间稳定运行,设计结果很好地满足了物理需求。