INDUSTRICAL OPTIMAL REGULATOR ADJUSTMENT

This paper presents a new practical method for PI or PID industrial regu-lator optimal adjustments.This method is well feasible for off-line theoreticaladjustment of a control system and provided for closed loop identification withon-line regulator tuning.The proposed algorithm is based on approximationinversion of s-domain disturbance property of a control system by shiftedChebyshev's series.The PI or PID regulator parameter optimization usings-domain approximation representation of time-domain performance index of acontrol system is exclusively discussed with an example of using the algorit-hm.The introduced method is proved convenient to industrial process withhigh-order mathematical model.And it has both theoretical and engineeringsignificance.     

AN AUTOMATIC VOLTAGE REGULATOR USING IDENTIFIED MODELS

This paper obtains the mathematical model of a single machine infinite bus power system using the idea of parameter identifications. Because the noise is considered in parameter identification process, the model reflects the real system more exactly. On the base of the identified model this paper also presents a discrete automatic voltage regulator by minimum variance control principles. In order to avoid the static error, we combine discrete minimum variance control with continuous integral control and get very satisfactory effects. This proposed control strategy is very easy to realize. The simulation results show that in every case the dynamic qualities of the proposed control strategy are incomparably superior to that of the conventional PI regulator, which means the proposed control strategy has great practical values.     

Application of Error Compensation Methods in High Precision Machining of Globoid Worm

鲜食葡萄始终占主导地位是我国葡萄产业发展的一个突出特点.长期以来,我国鲜食葡萄贮运保鲜业一直比较滞后,基本是季产季销,地产地销.因此,我国鲜食葡萄集中产区经常出现采后"运不出、贮不进、销不掉"的被动局面,阻碍了鲜食葡萄产业在适宜栽植区的快速发展.一些非适宜产区为了填补当地鲜食葡萄市场空白,也在积极发展鲜食葡萄生产,其结果必然导致生产成本提高,不利于我国鲜食葡萄的区域化种植和商品化生产基地的建设.     

化控剂对东北春玉米茎秆理化特性及抗倒伏的影响

通过探讨春玉米茎秆纤维素、半纤维素和木质素含量及木质素合成相关酶活性对不同化控剂的响应, 明确化控剂调控茎秆抗倒伏能力的力学机制, 可为生产上化控剂的合理运用提供理论依据。2015年和2016年在东北农业大学向阳实验实习基地进行大田定位试验, 以玉米品种东农253为材料, 分别于六叶期喷施吨田宝(代号DTB)及DCPTA [2-(3,4-二氯苯氧基)三乙胺]和ETH (2-氯乙基膦酸)复配剂(代号KP), 对照为清水, 完全随机区组排列。分析玉米不同生育时期茎秆抗折力、抗倒伏指数、木质素、纤维素和半纤维素含量及木质素合成关键酶的活性变化对不同化控剂处理的响应。喷施化控剂可显著提高茎秆4-香豆酸: CoA连接酶(4CL)和肉桂醇脱氢酶(CAD)活性, 以及纤维素含量、半纤维素含量、木质素含量、茎秆抗折力和抗倒伏指数, 显著降低实际倒伏率。相关分析表明, 茎秆抗倒伏指数与木质素含量、半纤维素含量呈极显著正相关(相关系数分别是0.67和0.64); 茎秆抗折力与纤维素含量呈极显著正相关(相关系数为0.89); 木质素含量与CAD活性呈极显著正相关(相关系数为0.89), 与4CL活性呈显著正相关(相关系数为0.51), 而与苯丙氨酸转氨酶(PAL)和酪氨酸解氨酶(TAL)活性均没有显著相关性。六叶期喷施化控剂通过提高茎秆木质素合成相关酶的活性(特别是CAD和4CL的活性), 改善茎秆纤维品质性状, 显著增强了春玉米茎秆的抗倒伏能力。     

Real Wages and Unemployment in Local Labor Markets: Pennsylvania MSAs, 1975-86

This paper specifies an unemployment rate model with relatively long lags on the manufacturing real wage and the level of real GNP as the independent variables. Estimates of the model for 12 MSAs in Pennsylvania over the period from 1975:2 to 1986:4 generally indicate a fairly strong positive unemployment response to lagged real wages. This is consistent with theoretical models of the labor market that hypothesize strong real wage effects during periods of aggregate supply shocks. The unique characteristics of the time period under study and the disaggregation to local labor markets might account for the fact that, in contrast to many previous empirical studies, we are able to uncover evidence of a positive real wage-unemployment relationship in U.S. time series data.     

Research on Calculating Method of Capitalization Rate in Real Estate Appraisal

In order to formalize China's real estate appraisal, an examination and registration system for real estate appraisers has been put into practice. China Institute of Real Estate Appraisers has edited a series of textbooks for this purpose and the standard rules and specifications for real estate appraisal are available. During reading the text book as well as the rules and specifications, the author found that there are some mistakes and uncertainty in the formula of overall capitalization rate. Because of its sensitivity to the value of real estate, it is extremely important to use correct overall capitalization rate. Based on the information collected, the author has systematically analyzed the overall capitalization rate formula, and clearly defined the concept involved. In this paper, it is expected to provide some insight into the improvement of real estate appraisal theory in China and offer some valuable reference for real estate practice.     

Forecasting Housing Investment in Developing Countries

In this paper we estimate alternative models of the growth rate of real housing investment for Japan, Korea, Taiwan, and the U.S. Pure time series models generally provide superior fit to these growth rate data both within and out of the sample period. These time series models are then used to forecast investment growth rates in other countries. The results indicate that such time series models can be used to provide reasonable accurate forecasts for other countries.     

A HIERARCHICAL CONTROL METHOD FOR REACTIVE POWER OPTIMIZATION IN LARGE-SCALED INTERCONNECTED POWER SYSTEMS

This paper presents a new hierarchical and coordinative control method for reactive power optimization in large-scale interconnected power systems. It combines the interconnection forecast method for hierarchical control in large-scale steady state industrial systems with the incremental linear programming method for reactive power optimization in real time. The results of applying the method to power system examples show that the method not only solves the problem of high dimension in order, but also keeps the advantages of the incremental linear programming method. The proposed method is also suitable for the security analysis of reactive power correction in large-scale interconnected power systems.     

Parameter design and simulation for animproved direct current side active power filter

Considering the characteristics of the dc side series active power filter (APF) that the output voltage cannot be adjusted and the control circuit is complex , an improved single phase dc series APF topology is proposed. The improvement of the new circuit topology and fundamental working principle are analyzed. Following the circuit power factor pre regulator principle, the designing method for the main circuit parameters is given. The voltage ring and the current ring are designed by using the zero pole method. The main circuit power switch is controlled with the same frequencies, while the control circuit was simplified further. Compared with the paralleled APF, the main circuit of topology structure is simplified and the number of the active switches is reduced, which show low input current harmonics, high power factor, large voltage output adjustment range and low cost. The simulation results prove that the proposed topology is correct and reliable.     

Fast circle measurement of industrial CT images based on existence probability

The general methods in reverse engineering cannot measure the inside of close parts. Traditional methods like Capture Geometrical Inside (CGI) would destroy the part. We used the industrial computer tomography (ICT) method to obtain accurate measurements of close parts. Based on the acquired computer tomography images, the size of an internal part was obtained through image measurement and subsequently edited, amended, and dimensioned in CAD software. First, the position and the pixel size of the circle were determined based on existence probability. Next, the actual size of one pixel was obtained based on the image size and the purview diameter. Finally, the actual circle size was calculated by multiplying the pixel size and the actual size of one pixel. A real part was measured using the method. The results show that the relative error of the measured circle radius and the actual size is less than 0.5% and the measuring time is several seconds.     

Concurrent Design of the Petroleum Equipment CAD System

Military petroleum equipment is one of main logistical equipment. The characteristics and organization of the petroleum equipment are analyzed and the design flow chart and concurrent design frame of the petroleum equipment CAD system is built up . The CAD system includes three subsystems, which are engineering subsystem, management subsystem and supporting environmental system. A solid model, assembly structure and strength of oil tank in vehicle are analyzed by integrated CAD/CAE/CAM software I-DEAS. Through concurrent design environment, design efficiency and quality of petroleum equipment are greatly improved.     

Landscape Design Talents' Knowledge and Ability Structure Based on Industry Demands

Knowledge transference and ability training are 2 standing points and starting points for the industry demands-oriented talent cultivation of modern higher education.In terms of landscape design knowledge,the landscape design industry requires 3 major knowledge modules,namely basic knowledge and theories,professional knowledge,and relevant knowledge;in terms of ability,it also requires 3 major ability modules,namely computer-aided design(CAD),design performance ability and ability of making conception,and each of them includes many specific knowledge points and ability points.It is important for such teaching processes as real question and proposition teaching,studio teaching and project-led teaching to propose a dual-track talent cultivation scheme focusing on both theoretical knowledge and practical ability according to the needs of landscape design industry.Moreover,it is imperative to arrange relevant courses and curriculum group that reflect knowledge and ability demands,as well as practicing courses or comprehensive design projects based on ability structure.     

DEVELOPMENT OF COMPUTER AIDED PROCESS PLANNING SUBSYSTEM FOR A CAD/CAPP INTEGRATED SYSTEM

Based on Group Technology, a CAD/CAPP integrated system is developed. This paper mainly covers the research work of the CAPP subsystem. In this subsystem, geometric and manufacturing information is obtained from the CAD data base, modular block programming and full Chinese menu are adopted, process planning is produced with the semi-generative method, and process card involved the operation charts is yielded by printer. The operation is simple and convenient, and the performance is quick. The ? CAPP subsystem is successfully integrated with the CAD subsystem. The subsystem is an advanced CAPP system.     

基于工作过程CAD/CAM工程技术应用课程教学改革实践

针对CAD/CAM工程技术应用的课程体系、理论课程教学内容、教学方法和实验课程教学进行了改革,成功地建立了CAD/CAM工程技术应用课程体系,取得了良好的教学效果。     

The processing and interpretation of north sea CZCS imagery

A series of CZCS scenes of the North Sea has been processed. The atmospheric correction of the scenes has been carried out after the scheme suggested by Gordonet al. (1983a) and also by the interactive technique of Arnone & Laviolette (1984). The processing techniques are described in relation to problems encountered in a case II water area such as the North Sea with yellow substances, suspended sediments and large coccolithophore blooms. Examples of atmospherically corrected colour images are evaluated.     

Discussion on Interactive Method for CAD Drawing andCalculation in Building Water Supply and Drainage Design

According to the features of CAD for building water supply and drainage design,the interactive method for CAD calculation and drawing in building water supply and drainage engineering are discussed . A practical example of ADS for hydraulic calculation has been given in this paper .     

New Progression about Gravity Quantization in General Relativity Theory in Real Space-time

Professor Venzo de Sabbata,working at World Laboratory,Lausanne,Switzerland,and Department of Physics,University of Bologna and Ferrara,Italy,is a famous Italy Physicist in the world.He is engaged with a series of creating research works about gravity quantization of General Relativity Theory in the real space-time which attract the attentions of the world.This paper pays the attention to introduce the works of this field,containing mainly:1.quantizing the general relativity theory in the sense of Einstem-Cartan theory,i.e., general relativity adds the torsion,which means introducing spin into the theory of gravity.2. building a compact mathematical tool for research of gravity quantization,the geometric algebra in the real space-time--multivector algebra,i.e.,developing a spinor manifold in the real space-time.     

Parameterized Design System of Motorcycle Based on Adams Virtual Prototyping Technology

This paper uses motorcycle as the research object and uses ADAMS/View as tools to deal with the inconvenience of constructing Motorcycle simulation model in ADAMS/View.The parameterized design system of Motorcycle is developed according to the requirements of simulation model by using ADAMS/View secondary development technology.The system has solved very complicated problem of motorcycle modeling in ADAMS/View,whose spatial structure is very complicated,and solved the problem of model imported by other CAD software which has information lose,model scale tends to heavy,follow-up simulation difficult and so on.The system is used to make the simulation model in ADAMS/View easier for follow-up simulation according to the basic dimension of Motorcycle and user's needs,and shorten the development period of the motorcycle,reduce the development cost,and carry on the series design.     

Real-Time Self-Photographing Technology in the Virtual Environment

As a new technology towards 21st century, the occurs of the virtual reality technology is a result of computer graphic, human machine interface technology, sensor technology and artificial intelligence. The real time self photographing technology based on the virtual environment is a typical application of this virtual reality technique. A series of things has been discussed and studied ,such as visual reality,video intercept and so on,and the real time self photographing system based on the technology of blue background image extracting. A new arithmetic is emphasized which is produced during study and exploitation.It is image fusion technique based on the contrast appreciate characteristic.     

大果水晶梨褐色果皮突变体木质素合成相关基因的组织特异性表达分析

为研究木质素合成相关基因(PAL1、PAL2、CAD、POD、4CL)在大果水晶梨褐色果皮突变体中的表达特性,并为研究梨褐色果皮形成机制奠定基础。按照RNA试剂盒法提取果皮、花、叶片、果肉、枝条韧皮部中总RNA;利用DNAMAN和Primer 5.0软件设计特异引物;使用实时荧光定量PCR技术研究基因的表达。结果表明,PAL1、PAL2、CAD、POD、4CL的最高相对表达量均出现在果皮中;果皮和果肉中POD的相对表达量极显著高于其他基因,花、叶片和枝条韧皮部中CAD的相对表达量极显著高于其他基因。综上所述,大果水晶梨褐色果皮突变体木质素合成相关的5个酶基因在果皮、果肉、叶片、花和枝条韧皮部中的表达具有明显的组织特异性,这些基因可能与大果水晶梨褐色果皮的形成关系密切。