兴义市顶效经济技术开发区边界层温度场结构特征研究

兴义市顶效地区进行的低空探空试验，旨在获得边界层内气温随高度变化的探测数据及不同条件下温度层结的资料，并确定该地区逆温层的特征和混合层厚度。该地区大气环境影响评价中已部分应用此结果。     

杂交油菜超低密度高效栽培主导因子的研究

通过1999年-2002年田间小区试验与大田示范相结合,并采用多点和多因子(播期、密度)控制研究,试验与示范结果表明：杂交油菜采取早播超低密度高效栽培法比对照超高密度迟播法纯利润多328 715元/hm~2,增值率为708．1%。     

Muscle lipofuscin content and satellite cell volume is increased after high altitude exposure in humans

Summary Muscle ultrastructural changes during a typical expedition to the Himalayas were analyzed by taking muscle biopsies from seven climbers before and after their sojourn at high altitude (over 5000 m for 8 weeks). M. vastus lateralis samples were analyzed morphometrically from electron micrographs. A quantitative evaluation was made of lipofuscin, satellite cells and myonuclei. Significant increases of the volume densities of lipofuscin (+235%) and satellite cells (+215%) were observed.     

轧钢车间生产线自由活套控制系统

本文针对轧钢车间辅助生产线自由活套高度控制系统,就其传递函数、系统构成、参数选择、抗扰性能、精度诸问题进行了分析,并对两种控制方案作了进一步探讨。同时,以工程实例作具体说明。     

按垂直温差计算折光系数的方法之二

本文根据Chaughey和Palmer(1979)的研究成果“对流边界层(即混合层)热通量H近似地随高度而线性减小”,提出了一种新的按垂直温差计算折光系数的方法。这种方法应用于山区或丘陵地区的三角高程测量中,能够提高折光系数和三角高程测量的精度。     

MGA1200EC质谱仪用于低压舱高空检测的改进技术

质谱仪是对气体成分进行分析、测定的专用设备,也是进行低压舱高空生理试验、装备鉴定试验、人体缺氧训练等在气体成份分析方面的必备设备。主要针对MGA1200EC质谱仪在高空应用上存在的问题做出适当的技术革新,使之能够满足低压舱高空试验测试的需要。采用的方法是建立了基于MCS51单片机的质谱仪采样系统,在质谱仪出气口处建立与采样点处压力相关的负压源,进行了气压高度为地面到15 km的低压舱内纯氧测试试验,试验表明该方法可行。可提高气体成分分析的速度,满足高空生理试验及装备鉴定的测试要求。     

深部岩体块系摩擦减弱效应试验

为了研究深部岩体在冲击作用下的力学特性,用深部岩体动态特性多功能试验系统对块系岩石在垂直冲击载和水平拉力作用下的动态特性进行了试验研究,通过试验,明确了冲击载、水平静力和摩擦力之间存在的相互联系,建立了冲击能与特征摩擦力、冲击能与摩擦减弱系数的函数关系,确定了产生摩擦减弱效应和超低摩擦效应的特征值条件.结论表明:在垂直冲击能和水平静力共同作用时,水平静力与余留位移的关系呈抛物线状,而且抛物线会出现一个余留位移的突变,突变后余留位移的增大明显加快.     

Computational mission analysis and conceptual system design for super low altitude satellite

This paper deals with system engineering and design methodology for super low altitude satel ites in the view of the com-putational mission analysis. Due to the slight advance of imaging instruments, such as the focus of camera and the image element of charge coupled device （CCD）, it is an innovative and economical way to improve the camera’s resolution to enforce the satel ite to fly on the lower altitude orbit. DFH-3, the mature satel ite bus de-veloped by Chinese Academy of Space Technology, is employed to define the mass and power budgets for the computational mis-sion analysis and the detailed engineering design for super low altitude satel ites. An effective iterative algorithm is proposed to solve the ergodic representation of feasible mass and power bud-gets at the flight altitude under constraints. Besides, boundaries of mass or power exist for every altitude, where the upper boundary is derived from the maximum power, while the minimum thrust force holds the lower boundary before the power reaching the initial value. What’s more, an analytical algorithm is employed to numerical y investigate the coverage percentage over the altitude, so that the nominal altitude could be selected from al the feasi-ble altitudes based on both the mass and power budgets and the repetitive ground traces. The local time at the descending node is chosen for the nominal sun-synchronous orbit based on the average evaluation function. After determining the key orbital ele-ments based on the computational mission analysis, the detailed engineering design on the configuration and other subsystems, like power, telemetry telecontrol and communication （TT＆amp;C）, and attitude determination and control system （ADCS）, is performed based on the benchmark bus, besides, some improvements to the bus are also implemented to accommodate the flight at a super low altitude. Two operation strategies, drag-free closed-loop mode and on/off open-loop mode, are presented to maintain the satel-lite’s altitude. Final y, a flight planning schedule for the satel ite is demonstrated from its launch into the initial altitude at the very beginning to its decay to death in the end.     

特低渗油藏分段压裂水平井经济技术界限研究

近年来分段压裂水平井在特低渗油藏开发中的应用越来越多,政策界限研究是实现经济有效开发的基础。综合考虑经济和技术两个方面,建立了经济技术界限确定方法。基于盈亏平衡原理,得到了经济极限初期产能及累产油量;同时从技术角度出发,基于位势理论和压降叠加原理,得到了单井实际初期产能。由实际初期产能与经济极限初期产能关系,得到了储层可动用对应的渗透率和有效厚度界限。以东辛油田盐227特低渗油藏为例,得到了一系列经济技术界限图版,为储层可动用性评价提供依据。     

广西猫儿山自然保护区蝗虫生物多样性初步研究

于 2 0 0 0年 7月至 1 0月将广西猫儿山自然保护区划分为海拔 4 0 0～ 80 0 m、 80 0～ 1 2 0 0 m、 1 2 0 0～ 1 6 0 0 m和 1 6 0 0 m以上的 4个区域。在每个区域中选择竹林生境、阔叶林生境、阔叶灌丛生境、草灌生境 ,分别随机抽取 2个样方 (2 5 m× 2 5 m)扫网调查蝗虫的种类及个体数 ,7月、 8月、 9月、 1 0月各调查 1次 ,并应用香农 -威纳 (Shannon- Wiener)多样性指数分析不同生境、海拔及月份的蝗虫种类及个体数。结果表明 ,猫儿山自然保护区蝗虫共有 31种 ,分别隶属于 5科 2 4属 ,山稻蝗 (Oxya agavisa Tsai)、中华越北蝗 (Tonkinacris sinensisChang)、喙尾蹦蝗 (Sinopodisma rostellocerca You)和短翅佛蝗 (Phlaeoba antennate Br.- W.)为该地区蝗虫类群的优势种。在 4种生境中 ,草灌类型的生物多样性指数最高 ,H =0 .92 3。随着海拔升高 ,多样性指数降低 ,以 4 0 0～ 80 0 m区域最高 (H =0 .92 8) ,1 2 0 0～ 1 6 0 0 m区域最低 (H =0 .774 ) ,1 6 0 0 m以上没有调查到蝗虫。在4个月份中 ,蝗虫生物多样性指数从低到高依次为 7月 (H =0 .6 76 )、1 0月 (H =0 .879)、8月 (H =0 .936 )、9月(H =0 .94 1 )