Establishing and Application of the Mathematical Model of the Impulse Electroflotation Reacting Tank

The properties of the Impulse electroflotation equipment are introduced briefly ,and the factors that influence the treatment effect of Impulse electroflotation are analyzed. The mathematical model of the Impulse electroflotation reacting tank which determines the height, volume and treatment capability of Impulse electroflotation is provided on the base of the basic equations of electroflotation. A calculate software for the design of Impulse electroflotation reacting tank is developed and the source code is given.     

The feasibility of using an industrial sewage sludge produce in Pakistan as agricultural fertilizer used for cultivation of Sorghum bicolor L

Abstract

In the present study we evaluate the feasibility of using untreated industrial sewage sludge by liming before use as a fertilizer, produced in Pakistan. In a pots experiment, limed industrial sewage sludge (LSW) and non-limed sewage sludge (NLSW), were amended with soil separately and grown sorghum. After maturity, the sorghum grains were analysed for total contents of potentially toxic metals (TPTM), As, Cd, Cr, Cu, Ni, Pb and Zn. The proportion of different mobility fractions of each element in LWS and NLSW, a modified BCR sequential extraction procedure (Community Bureau of Reference) and single extractions with mild extractants (deionized water and CaCl₂) were used. In LSW, the availability of most of the elements under study was reduced, probably due to the increased pH of soil, while this was the reverse in the cases of Cd and Cu, their mobility was slightly increased by lime-treated sludge. The sorghum grains grown in LSW have low level As, Cr, Ni, Pb and Zn as compared to grains grown in NLSW, except Cu and Cd, which, however, never exceeded legal limits. Thus the research showed that liming, by augmenting soil alkalinity, allows a safe agricultural use even of industrial sludge, which is environmentally hazardous for its great content of heavy metals.     

松轻油综合利用工艺流程的探讨

本文主要对松轻油的综合利用工艺及流程进行探讨，松轻油在用烧碱溶液和水的合理净化处理后，增加水合反应工序，采用二次正交试验设计分析，反应液松油醇含量（y）与硫酸用量（x1）、反应温度（x2）和反应时间（x3）存在如下关系：y＝16．33＋1．21x3-2．07x2x3-1．75x23。经分析，在45℃下反应8小时可使反应液中松油醇的含量由原来的5％左右提高到20％左右，经蒸馏得选矿油、干馏松节油、杂酚油和松焦油，产品色泽浅、稳定，焦臭气味基本消．     

脉冲微分方程解的全局渐近性态

本文研究一般脉冲微分方程解的全局渐近性态。通过使用分段连续的（但可以是非单调的）Ｌｉａｐｕｎｏｖ函数，我们首先建立一个全局渐近性态的基本定理，然后把基本结果应用于一类具线性脉冲扰动的变系数线性动力系统，获得了其零解是全局吸引子的充分条件。     

证券公司效率与经济增长：理论框架与实证研究

考察宏观经济增长对证券公司微观效率的影响和作用,实证研究获得了经济增长不利于金融发展和证券业效率提升的证据,财政分权、政治集权的体制及经济增长方式的粗放性是其背后的深层次原因,改革不尽合理的财政收入分配制度和地方官员考核晋升制度、适度调低经济增长目标、实现经济增长方式从粗放型向集约型转变有利于证券公司效率的提升。     

Study of the Digital Measurement Tachnique and Apparatus for Impulse High-Voltage

A digital measurement apparatus is developed for Impulse high voltage. Ine ap paratus composes of a high speed A/D converter(20 MHz),a single-chip computer interface and some other high speed analog intergrated circuits with excellent function,It is characteristic of flxing transient waveforms,storing,processing and analysing waveform data measuring maxi-mum value of impulse high voltage.     

动力学普遍定理的矩阵解及坐标变换矩阵

本文在经典动力学的基础上提出求解动力学普遍定理的矩阵解定型公式.矩阵解之最大优点是具有极方便之坐标转换性能而且便于以 Fortran 语言储入电脑.本文同时以直观的几何方法导出坐标变换矩阵,以便于应用.     

规模化猪场粪污处理工艺的研究

在国内外猪场粪污处理工艺调研的基础上，通过对粪污粒径分布、沉降性能和气浮工艺适用性的试验研究，确定了一种先进实用、可靠、易行的猪场粪污达标排放的处理工艺。     

规模化猪场粪污处理工艺的研究

在国内外猪场粪污处理工艺调研的基础上，通过对粪污粒径分布、沉降性能和气浮工艺适用性的试验研究，确定了一种先进实用、可靠、易行的猪场粪污达标排放的处理工艺。     

农资仓储脉冲超宽带室内定位系统设计与试验及误差分析

针对仓储环境下农资物品与自动导引运输车(automated guided vehicle,AGV)的定位精度低的问题,开发了适用于农资仓储环境下的脉冲超宽带技术(impulse radio-ultra wide band,IR-UWB)室内定位系统。采用双面双程测距(symmetric double sided-two way ranging,SDS-TWR)方法,建立了考虑时钟频偏等因素的到达时间(time of arrival,TOA)定位系统模型。研究表明定位系统计算所带来的误差主要来源于距离测算方法和节点位置计算方法 2方面,在这2方面提出了相应的解决办法,包括测距算法的选择,基站的布置等。最后,以DW1000射频芯片为硬件基础,设计了定位系统移动站和基站节点,并在农资仓库的环境中分别进行了静态测距试验、静态定位试验、以及动态定位试验。试验表明:静态测距精度优于50 mm,静态定位精度优于50 mm,动态定位试验精度优于85 mm。综合结果表明,该文搭建的系统可满足农资物品定位的实际应用要求,可为室内农资仓储环境下AGV的定位和导航提供参考。