β—BaB_2O_4晶体的ps脉冲参量放大

本文报导用被动锁模Nd:YAG激光器的二次谐波(532nm)泵浦两块BBO晶体获得580nm～2500nm可调谐参量放大的实验研究。简并点附近能量转换效率达10％。     

Superconducting Busline Design for HT—7U Tokamak

Superconducting (SC) tokamak HT-7U has seven pairs of buslines connecting toroidal/Poloidal coils and the current leads,These SC buslines(SCBLs) share a common cryostat and are made of the calbe in conduit conductors(CICCs) arranged as a decoupling configuration.In order to reduce the heat loads conducted from the seven current leads with a capacity of 15kA during the magnets cooldown.the buslines with a much lower thermal conduction were employed in comparison with the current leads,and a special cooling loop was designed.     

非共振微波场驱动情况下的简并量子拍频激光器

本文讨论了被非共振微波场驱动的三能级原子系统在无粒子数反转时所表现的激光增益以及在无自发和受激辐射时所表现的光学吸收两种物理现象以及产生的条件。     

A Calculation of Steady Pressure Drop and an Analysis of HT—7U CICC

Under the condition of steady,the pressure drop of coolant is mainly caused by friction along the cable.in the CICC(cable-in-conduit-conductor).helium flow within the conductor consists of two parallel interconnected tubes.The velocity distribution has some differece between the central channel and conductor space.The region of Reynolds number is from 10^3 to 10^6.This paper describes the calculation of pressure drop of HT-7U CICC at various mass flows.It is assumed that the coolant flows in two parallel,rough tudes during the caclulation.     

复杂介质的折射波射线追踪

本文由二维层状介质模型出发论述了折射波逐段迭代射线追踪的原理，由于连接炮点和接收点之间的初始射线路径满足费马原理，因此其上任意连续三点之间的射线路径也满足费马原理。据此即可分别推导出透射中间点和折射点的一阶修正公式，进行折射线逐段迭代计算求出整条射线路径。将此原理推广到二维块状介质模型，用于解决复杂介质中的折射波射线追踪，推导出任意界面上折射点的一阶显式增量修正公式。避免了高次多元方程的求解，具有计算速度快，能够适用任意界面的特点。文中还指出了在块状介质模型中用逐段迭代法进行射线追踪较在层状介质中难度大的原因在于射线路径点的增、删。实例试算表明。文中所述方法是一种有效的折射波射线追踪方法。     

KCX-1型快速齿科手机消毒器

口腔齿科手机是HBV、HCV、HIV等血液传播性疾病和消化道传染病的传播媒介。采用激光泵浦光源在辐射过程中产生的瞬间高温、丰富的光谱分布的强光作为载体,对齿科手机进行快速、彻底、无损伤的消毒灭菌。     

信息系统建设项目的成本收益分析

介绍了成本比较法和期望净收益法在信息建设项目成本收益分析中的具体应用 ,提出了解决具体项目的方法和步骤。     

基于mini C RAN的IEEE1588时间同步方案

基于通用处理平台的室内覆盖基站系统(mini C-RAN)是一种基于通用处理器研发的小型化、低功耗、高容量蜂窝覆盖的TD-LTE基站系统.由于TD-LTE系统对时间同步要求非常高,所以提出一种基于mini C-RAN的1588时间同步方案.在基带池内部采用主从同步模型使其内部达到时间同步并向下级传输1588时间同步报文,在交换机内部采用透明时钟模型得到1588报文在交换机内部的传输时延.通过用1588时间分析仪测试其时间延迟在正负200 ns内,达到了TD-LTE基站系统要求.     

Ni10+离子辐照Ni-Mo-Cr合金微观结构演变和硬化的研究

室温下对钍基熔盐堆(TMSR)中候选合金结构材料Ni-Mo-Cr合金进行了能量为132MeV的Ni 10+离子辐照研究,辐照剂量分别为1dpa、3dpa和9dpa。X射线衍射仪(XRD)分析显示离子辐照后Ni-Mo-Cr合金发生晶格畸变,维氏显微硬度的测量结果表明高剂量的离子辐照造成Ni-Mo-Cr合金的硬化,这主要归因于辐照导致材料内部形成大量缺陷。当辐照剂量为9dpa时,维氏硬度测试结果表明损伤的峰值出现的深度介于8.1~12.3μm之间,此结果与理论计算相吻合。     

Modeling Method of Automotive Body CAN/LIN Nets Application Protocol Based on Object-oriented Colored Petri Net

Recently automotive nets are adopted to solve increasing problems in automotive electronic systems.Technologies of automotive local area network from CAN and LIN can solve the problems of the increasing of wire bunch weight and lack in module installation space.However,the multilayer automotive nets software becomes more and more complex,and the development expense is difficult to predict and to keep in check.In this paper,the modeling method of hierarchical automotive nets and the substitution operation based on object-oriented colored Petri net(OOCPN) are proposed.The OOCPN model which analyzes the software structure and validates the collision mechanism of CAN/LIN bus can speed the automobile system development.First,the subsystems are divided and modeled by object-oriented Petri net(OOPN).According to the sets of message sharing relations,the message ports among them are set and the communication gate transitions are defined.Second,the OOPN model is substituted step by step until the inner objects in the automotive body control modules(BCM) are indivisible and colored by colored Petri net(CPN).And the color subsets mark the node messages for the collision mechanism.Third,the OOCPN model of the automotive body CAN/LIN nets is assembled,which keeps the message sets and the system can be expanded.The proposed model is used to analyze features of information sharing among the objects,and it is also used to describe each subsystem real-time behavior of processing messages and implemental device controllers operating,and puts forward a reasonable software framework for the automotive body control subsystem.The research can help to design the communication model in the automotive body system effectively and provide a convenient and rapid way for developing the logical hierarchy software.