低杂波电流驱动的密度极限分析

用低杂波的可的性条件，参量不稳定条件和功率耦合谱分析了低杂波电流驱动。由于波的可近性条件限制耦合谱中平行相速度较大的波进入等离子体中心，参量不稳定性使平行相速度较低的波与离子相互作用，随着等离子体密度的增中，这些作用越来越明显，最终导致低杂波不能在中心与电子相互作用，驱动电流消失，这就是所谓密度极限。在本文建立的模型基础上的计算结果与实验结果符合较好。     

一种新型的双极功率器件—BST

针对常规双极功率晶体管（ＢＰＴ）中存在的高频、高电流增益和高ＣＥ击穿电压间的固有矛盾，基于一新工艺提出了一种新型的双极功率器件──ＢＳＴ（ＢａｓｅＳｈｉｅｌｄｉｎｇＴｒａｎｓｉｓｔｏｒ）结构。分析了ＢＳＴ夹断后的两维电场解析解，可知深Ｐ＋多晶硅基区的引入对有源Ｐ基区产生明显的电场屏蔽效应，该基区屏蔽效应随Ｐ＋基区深入Ｎ－区中的深度Ｌ的增加以及相邻Ｐ＋基区间距２Ｄ的减小而增强。正是这种基区屏蔽效应，使得ＢＳＴ的特征频率ｆＴ、电流增益ｈｆｅ和ＣＥ击穿电压ＢＶｃｅ０都较常规ＢＰＴ大为提高，较好地解决了常规ＢＰＴ中存在的主要矛盾。实验验证了理论分析的结果。     

长途电信枢纽楼电源自动监控系统

介绍了天津长途电信枢纽电源自动监控系统的结构、特点、功能、效果及开发实验过程中的一些体会。对正在设计和实施类似监控系统的单位及工程技术人员会有一定的启迪和帮助。     

Single-phase AC losses in prototype HTS conductors for superconducting power transmission lines

We report single-phase AC loss measurements on 8-, 4-, and 3-layer, multi-strand, HTS prototype conductors for power transmission lines. We use both calorimetric and electrical techniques. The agreement between the two techniques suggests that the interlayer current distribution in 1-m long conductors are representative of those in long conductors. The losses for the 8- and 4-layer conductors are in rough agreement, with the 8-layer losses being somewhat lower. The 3-layer conductor losses are substantially higher — probably due to unbalanced azimuthal currents for this configuration.     

综合国力的数学建模

本文考虑社会文明与社会导恶现象的制约机制，建立一个综合国力的非线性数学模型，从数学上讨论了相应的二次微分系统的Ｈｏｐｆ分叉，中心与细焦点的判定，极限环的存在唯一性等问题，并对数学结论予以合理解释，把社会相平面划成社发展区域，社会动荡区域和社会崩溃区域，研讨社会走向，确定纳入社会发展区域的途径。     

Relationship between refined Griffith criterion and power laws for cracking

Rice [J. Mech. Phys. Solids 26 (1978) 61] proposes a refined Griffith criterion, at any local crack front, where G is the Irwin's energy release rate, γ is the surface free energy and is the rate of crack advance. The refined version implies that the entropy production inequality should holds locally rather than globally from the thermodynamic point of view. Within the irreversible thermodynamic framework developed by Rice [J. Mech. Phys. Solids 19 (1971) 433; Constitutive Equations in Plasticity, 1975, p. 23], it is revealed in this paper that the entropy production inequality holds for each internal variable if its rate is a homogeneous function in its conjugate force. It is further shown that widely-used power laws for crack growth are just certain homogeneous kinetic rate laws, so it is concluded that the power laws directly lead to the refined Griffith criterion.     

单路LDMOS实现的高压电平位移电路及其应用

提出了一种HVIC中高端浮动电路的新的实现方式,该方式采用单路LDMOS,实现了高压电平位移的功能。分析了该方式的电路结构和工作原理,以此为基础,设计了功率MOS栅驱动集成电路。在主要电学指标相近的情况下,与目前常用电路相比,版图面积减小了约20%。采用6μm CMOS-LDMOS工艺,通过Hspice进行仿真验证,证明该方式正确可行。     

一种基于标准CMOS工艺的低成本振荡器的设计

提出了一种基于标准CMOS工艺的低成本环形补偿振荡器。由于采用了误差反馈补偿技术，该振荡器无需精准的电流源和电压源；利用电阻温度补偿和电源电压稳压，使振荡周期对温度、电压，以及工艺偏差均有较强的容忍能力，且周期大小易于调整。在输入电压范围为4．5～6V，温度范围-40～125℃，以及五个MOSFET工艺偏差的情况下，进行了Hspice仿真。结果表明，在最坏情况下，振荡器周期的最大偏差为7．5％，而在不考虑温度的情况下，由电压和MOSFET工艺变化所引入的振荡周期偏差为0．9％。该振荡器满足电源管理芯片要求，适合低成本DC／DC转换器、充电器等电源管理芯片的应用。     

Spectral Efficiency Evaluation for MRC Diversity Schemes Over Generalized Rician Fading Channels

In this paper, closed-form expressions for the capacities per unit bandwidth for generalized Rician fading channels are derived for power and rate adaptation, constant transmit power, channel inversion with fixed rate, and truncated channel inversion adaptation policies. The closed-form solutions are derived for the single antenna reception (without diversity combining) and maximal-ratio combining (MRC) diversity cases. Truncated channel inversion adaptation policy is the best policy for the single antenna reception case, while the channel inversion with fixed rate policy is the best policy for the MRC diversity case. Constant transmit power policy provides the lowest spectral efficiency as compared to the other policies with and without diversity.     

HL-2Aװ��ECRH�����͹��ʳ�������

采用TORAY代码对HL-2A装置ECRH系统在单零点偏滤器位形下的波与等离子体相互作用的情况进行了模拟计算,研究了等离子体和波参数对ECRH波迹和功率沉积以及电流驱动的影响。根据数值计算结果,HL-2A装置ECRH系统在等离子体线平均密度为3.0×1013cm-3、中心电子温度为1.19keV的情况下,以O模作为入射波垂直入射时的单次吸收系数为99.3%,最大电流驱动效率为0.005×1020A.W-1.m-2。