非均匀三腔谐振腔高频特性的数值分析

 用SUPERFISH程序对非均匀三腔谐振腔的高频特性进行了数值分析。分析了各腔长度的变化对类TM₀₁₀ 2π/3模式及其频率、各腔纵向场分量Ez大小及Ez径向分布的影响。结果表明：当各腔长度变化时，该模式只在一定范围内存在，且频率变化不大，频率的最大值和最小值相差小于4%；当该模式存在时，第一腔长度越小，则第一腔的纵向场分量越大；当第一腔长度不变时，第三腔的纵向场分量随着第二腔长度的增大而增大，而第一，二腔纵向场分量则随之变小；各腔长度变化对纵向场分量的径向分布影响很小。     

浙江省汛期旱涝趋势对气候变暖的响应

近50多年来浙江省气候变化总趋势在逐渐变暖，80年代中期开始变暖明显，增幅加大．浙江省汛期各月降水量对气候变暖的响应不同：在季节转换月份5月和9月，降水量明显减小，而在夏季的降水量增加，8月尤甚．在气候变暖期，浙江省汛期旱涝事件的发生频数增加．大气环流时气候变暖的响应是：5月份，高层南亚高压偏弱偏南，中国东南部上空为平直的西风气流，引导冷空气多偏北东移，中层印缅槽的减弱导致向江南水汽输送减少，低层偏南气流远离华东，浙江省主要受单-西北干燥气流影响，降水显著偏少；8月份，青藏高压位置偏西，中国东南部上空西北气流有利引导冷空气南下，低层越赤道气流加强了赤道幅合带的扰动，有利台风的生成和发展，中层副高南侧偏东气流有利于引导台风北上登陆华东，导致影响浙江台风年频数增加，台风与冷空气相互作用有利强降水发生，形成台涝．在气候变暖期海水表层温度距平升高，ENSO事件的多发、增强的倾向影响了浙江省汛期旱涝趋势．     

A Ni/YSZ composite containing Ce0.9Ca0.1O2−δ particles as an anode for SOFCs

A composite material (hereafter referred to as NYC) containing Ni, Y₂O₃-stabilized ZrO₂ (YSZ) and Ce_0.9Ca_0.1O_2−δ (CC10) particles was prepared and used as the anode of solid oxide fuel cells (SOFCs). The performance of NYC was better than that of conventional Ni/YSZ anodes in terms of anodic overpotential and interface impedance. The additional CC10 particles improved the anode properties. XRD results suggest that a solid solution of YSZ and CC10 was produced. From impedance measurements, it is concluded that the solid solution exhibits substantial electronic conduction. Ni/YSZ/15 wt% Ce_0.9Ca_0.1O_2−δ anodes exhibited the best properties over the experimental temperature range. A SOFC with an anode of Ni/YSZ/15 wt% Ce_0.9Ca_0.1O_2−δ provided the maximum power density and current density. Addition of CC10 with an average particle size of 0.3 μm was more advantageous than that with an average size of 3 μm.     

HT—6B托卡马克上的MHD扰动模式分析

利用磁探针对ＨＴ－６Ｂ托卡马克上的Ｍｉｒｎｏｖ扰动的大环模数进行了分辨，发现在一次放民过程中ｎ＝１，２，３，４，的模数同时存在，对各模的频谱分析表明，当扰动较小时，各模扰动具有同为２０ｋＨｚ的单一频率，当扰动增大时，各模在２０ｋＨｚ的基础上出现４０ｋＨｚ的倍频，倍频出现的合理解释是磁岛岛宽的振荡。     

微量元素与脑血管疾病

微量元素锌、铜、硒、铬及宏量元素钙和鲜是机体内环境一个重要组成部分，与脑血管疾病有密切关系。作者在文中逐一作了介绍，并提供了１８篇参考文献。     

Experimental Investigation on Low Magnetic Field Operation of an Overmoded Slow-Wave High-Power Microwave Generator

The experimental results of an overmoded slow-wave high-power microwave generator operated at low magnetic field are presented. The feasibility of low magnetic field operation is investigated both theoretically and experimentally based on the characteristics of the overmoded slow-wave device. The experiments were carried out at the Spark-2 accelerator. Under the condition of guiding magnetic field strength of 0.55 T, diode voltage of 4 74 k V,and beam current of 5.2kA, a microwave was generated with power of 510 MW, mode of TM01, and frequency of 9.54 GHz. The relative half-width of the frequency spectrum is less than 1%, and the beam-to-microwave efficiency is about 21% in our experiments.     

非线性互补约束优化问题的可行性条件

本文研究了非线性互补约束优化问题的可行性条件，其中约束条件除互补问题外还包括第一水平(设计)变量和第二水平(状态)变量同时出现的其它非线性约束，它是线性互补约束优化问题的可行性条件的推广。     

赝二元化合物Dy(Fe0.9M0.1)2(M=B,Al,Ga)的磁性研究

研究了赝二元化合物Dy(Fe_0.9M_0.1)₂(M=B,Al,Ga)的磁性。M对Fe的置换,使居里温度下降,Fe原子的磁矩改变。矫顽力随温度的降低,增加很快,增加的幅度与M有关。磁化强度的温度关系,在磁场小于临界值时,出现反常和热磁效应。用Fe原子局域环境的变迁和低温下内禀磁硬度的急剧增加,解释了上述现象。 关键词：     

ESTERIFICATION ON ZEOLITES

Primary, secondary, and tertiary alcohols and polyols were esterified with carboxylic acidin the presence of HY zeolite. Yield of ester of primary alcohol is over 80 per cent, andthat of sec- and tert-alcohols, 40-50 per cent generally.γ-Lactone was synthesized byrearrangement of α- or β-octylenic to tridecylenic acid with HY zeolite.     

决明子有效成分的提取

决明子的主要功能化学成分有蒽醌类、吡酮类和多糖等，具有降血脂、降血压、保肝、通便等作用。本文采用乙醇提取决明子中的三种有效成分：多糖、蒽醌、黄酮。对乙醇浓度、浸提温度、浸提时间、固液比、浸提次数进行了单因素梯度实验，确定了其条件范围，通过进一步正交实验得到决明子有效成分的乙醇提取工艺的最优因素组合．乙醇浓度50％，浸提温度60℃，浸提时间2．5h，固液比l：20。