Conceptual design of a bioregenerative life support system containing crops and silkworms

This article summarizes a conceptual design of a bioregenerative life support system for permanent lunar base or planetary exploration. The system consists of seven compartments – higher plants cultivation, animal rearing, human habitation, water recovery, waste treatment, atmosphere management, and storages. Fifteen kinds of crops, such as wheat, rice, soybean, lettuce, and mulberry, were selected as main life support contributors to provide the crew with air, water, and vegetable food. Silkworms fed by crop leaves were designated to produce partial animal nutrition for the crew. Various physical-chemical and biological methods were combined to reclaim wastewater and solid waste. Condensate collected from atmosphere was recycled into potable water through granular activated carbon adsorption, iodine sterilization, and trace element supplementation. All grey water was also purified though multifiltration and ultraviolet sterilization. Plant residue, human excrement, silkworm feces, etc. were decomposed into inorganic substances which were finally absorbed by higher plants. Some meat, ingredients, as well as nitrogen fertilizer were prestored and resupplied periodically. Meanwhile, the same amount and chemical composition of organic waste was dumped to maintain the steady state of the system. A nutritional balanced diet was developed by means of the linear programming method. It could provide 2721 kcal of energy, 375.5 g of carbohydrate, 99.47 g of protein, and 91.19 g of fat per capita per day. Silkworm powder covered 12.54% of total animal protein intakes. The balance of material flows between compartments was described by the system of stoichiometric equations. Basic life support requirements for crews including oxygen, food, potable and hygiene water summed up to 29.68 kg per capita per day. The coefficient of system material closure reached 99.40%.     

基于电阻法的工艺液位传感器测量系统及其校准装置的研制

介绍了一种基于电阻法的工艺液位传感器测量系统的设计与实现,该传感器测量系统包括利用液位传感器、点式液位传感器、耗尽关机液位传感器与剩余液位传感器及对应的变送器。设计了相应的半自动校准系统对传感器的精度进行标定,分析了测量结果的不确定度。经过测试,所有传感器各项指标均满足设计要求。该传感器的研制解决了现有容积计量及液压试验系统不能对贮箱各不同部位进行容积和高度监测的问题。     

浅析歼强飞机液压系统元件多发性故障

简要介绍歼强飞机液压系统的特点,论述元件多发性故障的现象、原因,列举动力元件、执行元件、控制元件和辅助元件常见故障分析和预防措施。     

一类隔离驱动电路的“剩余驱动”问题

讨论直流变换器中将脉宽调制器（PWM）输出与受控MOS管栅极连接的一类开关驱动电路.专注于分析它在PWM电路关闭后对栅极产生的驱动信号,被命名为＂剩余驱动＂.描述这类剩余驱动的电气特性,说明它对变换器造成的危险,提出改进这类驱动电路以消除这些危险的4种方法.     

飞行器太阳能源计算方法CSCD

介绍了空间飞行器典型电源系统组成,通过对影响太阳能源输出的各项参数因素分析,提出了空间飞行器太阳能源计算方法,该方法包括由功率计算所需太阳阵面积的公式和由太阳阵面积计算输出功率的公式,达到了准确计算太阳能源的效果,解决了以往空间飞行器太阳能源估算误差大,在总体回路设计中电源参数难以闭环的问题。     

卫星控制系统测试数据自动判读系统设计

针对卫星控制系统测试数据类型多和数据量大的特点,人工判读方式存在判读时间长和判读精度不够高等不足,分析了卫星控制系统测试数据的变化规律,建立了测试数据的判读规则,在此基础上完成自动判读方法设计和自动判读系统设计,该系统能够按照设置的判读规则进行自动判读,对判读结果进行实时显示和存储,提高了测试效率和判读的准确性.     

浅议我国个人所得税实施中存在的问题及解决对策

个人所得税在调节个人收入、增加财政收入、维护国家权益等方面发挥了积极作用,但是随着我国经济的发展,在实施个人所得税中也逐渐暴露出一些问题.本文针对这些问题,进行了深刻的分析,并提出了解决的对策.     

对高校建立经常性统计数据质量核查制度的思考

文章探讨了在国家教育体制不断改革的情况下,经常性统计数据质量核查制度的内涵,以及高校建立经常性统计数据质量核查制度的必要性,并对高校如何落实经常性统计数据质量核查制度提出了自己的看法.     

相关系数平稳过程时频分析方法

相关系数平稳过程是从非平稳过程中分离出的一类工程上常见且便于研究的随机过程,其均值和方差都可随时间变化,传统的平稳随机过程是它的一个特例。本文提出了相关系数AR(p),MA(q)和ARMA(p,q)序列的概念,建立了相关系数平稳过程的时频分析方法。该方法首先在时域进行全程分析,得到相关系数平稳过程的均值函数、方差函数和相关系数函数,然后可以对其进行傅里叶变换、短时傅里叶变换或小波变换,给出相关系数平稳过程的谱密度,同时提出了随机项谱密度和趋势项谱密度的概念。文中还讨论了线性系统对相关系数平稳过程输入的响应。     

过失速机动飞机的鲁棒非线性控制律设计

 采用非线性动态逆和结构奇异值综合方法设计了过失速飞行条件下飞控系统控制律,解决了飞控设计中面临的非线性和鲁棒性问题。应用非线性动态逆的目的就是对过失速机动飞行条件下高度非线性的飞机动力学进行线化;从而围绕线性的快逆回路应用结构奇异值综合方法设计相应的鲁棒控制器,以提供对驾驶员指令的鲁棒跟踪。所设计的飞控系统将达到期望的飞行品质,确保系统对过失速机动飞行过程中因非定常气动力效应引起的系统参数摄动鲁棒性良好。高逼真度、非线性的仿真验证了这一点。