船舶在规则波中回转运动的研究

研究了船舶在规则波中的回转性能．首先进行约束模型试验，得到了水动力系数，然后计算船舶在规则波中的回转圈．计算时考虑了波浪漂移力，并讨论波高一定时波长、舵角、船速对回转圈漂移的影响．     

TCG16CNC数控机床诊断推理系统的设计思想

油井钢管是上海宝钢优先发展的高附加值产品，加工油井钢管管螺纹的数控机床是宝钢从德国和美国引进的Ａ类重要设备．此文是对ＴＣＧ１６ＣＮＣ管螺纹数控机床进行基于加工质量的状态监测系统和故障分类诊断软件的研究工作的一部分，文中介绍了ＴＣＧ１６ＣＮＣ机床的结构特点、产品质量标准、应用中的技术改造，ＶＸ及建立该机床的监测诊断系统的设计思路．     

在五坐标专用数控磨床上特种回转面刀具的成形原理

该文研究了在五坐标专用数迭工具磨床上加工特种回转面刀具的精确理论，导出了工艺系统运动函数非线性方程组，刀槽前后刀面是在一次走刀中同时形成的，并保证等法向前角。     

椭圆砂轮截形的修整误差

本文介绍了采用圆弧修整法修整砂轮时调整参数的确定方法，并推导出了砂轮修整误差方程，为采用切入磨削法磨削椭圆沟道时，如何控制砂轮修整误差提供了重要的依据。     

机床定位误差的微型计算机补偿

本文叙及数显、数控机床用微型计算机补偿位置检测传感器误差的方法。并提出了对三维误差补偿的新原理。     

高速旋转卡盘及工件刚度对动态夹紧力的影响

为解决高速车削对工件夹紧系统要求越来越高的问题,采用理论分析、有限元计算和实验研究相结合的方法定量分析了高速旋转卡盘和工件刚度对动态夹紧力的影响规律。研究表明:并非100%的卡爪离心力转化为卡盘的动态夹紧力损失,工件刚度越低,动态夹紧力损失越小。卡盘通过其径向刚度和弯曲刚度综合影响动态夹紧力变化,高的卡盘单元径向刚度对降低动态夹紧力损失有利;在较大工件刚度时,采用较低的卡盘弯曲刚度有助于降低动态夹紧力损失。该文的计算模型具有较高的精度,对提高高速车削过程安全性并充分发挥卡盘的高速潜能以及高速卡盘的优化设计与应用具有重要意义。     

Regional characteristics of the interdecadal turning of winter/summer climate modes in Chinese mainland

Tomé and Miranda’s climate trend turning discriminatory model is used to identify the spatial-temporal characteristics of the interdecadal turning of winter/summer climate modes at stations and in eight sub-areas over Chinese mainland based on the 1961–2000 observations. It is found that the stations with close occurrence years of the interdecadal trend turning (ITT) and coincident trends after the ITT exhibit a zonal distribution. A view is accordingly proposed that the interdecadal turnings of climate modes in China have remarkably regional structures. The research results show that after the early 1980s, winter climate over Chinese mainland overall trends towards a “warm-wet” mode, while summer climate had an abrupt change into “warm wet” mode in the late 1980s, suggesting that the time of the “warm-wet” mode turning for winter climate is earlier than that for summer climate. The regional characteristics and test results of the ITTs in eight sub-areas suggest that winter climate exhibits a distinctive “warm-dry” trend in North China after the late 1970s, and a slight “warm-dry” trend in Northeast China, South China, and Southwest China after the late 1980s. A “warm-wet” trend appears in the rest four sub-areas (the middle and lower reaches of the Yangtze River and the Huaihe River Valley, briefly Jianghuai, the east of the Tibetan plateau, and the east and west of Northwest China) after the early 1980s. The summer climate trends towards a “warm-dry” mode in Northeast China, North China and the east of Northwest China after the late 1980s, but a “warm-wet” mode appears in Southwest China and the east of the Tibetan plateau after the middle 1970s, as well as in Jianghuai and the west of Northwest China after the early 1980s. Specially, summer climate in South China started a “cold-wet” trend in 1984.     

通信原理课程可视化仿真工具的应用

计算机仿真技术已成为教学和科研的重要手段之一。介绍了通信原理课程教学中运用的各种计算机仿真工具特点,并以2FSK信号的调制为例,详细论述了利用matlab、systemview、flashmax等常用软件仿真通信原理理论的过程,最后通过比较,总结出常用仿真软件在通信原理课程中的应用场合。     

现代社会对泸沽湖摩梭文化的冲击

摩梭文化在历史上曾多次受到其他民族文化的洗礼，但其母系文化仍以强有力的生命力在传承。现代社会对摩梭文化的冲击则分两个阶段，社会转型前的冲击主要源于极左政策，未从根本上动摇母系文化存在的基础。社会转型后的冲击主要来自商品经济，对摩梭社会产生了全面的影响。