机械通风自动控制系统研制试验

本文对机械通风自动控制系统进行了研制，并用于实仓试验。试验结果表明，该系统可提高工作效率，减轻劳动强度，节约能耗。     

浅谈粮情测控系统在我库的应用和维护

通过我库ZH128型粮情测控系统近7年的应用，证明了该系统在粮食储藏工作中具有先进性和可维护性。为实现粮情自动检测提供了经验。     

REALIZATION OF PRE-ALERT AND UP-ALEAT IN FIRE DETECTION AND CONTROL

From a viewpoint of the sectirity and the exactness for a fire system,this paperexplicates the function and the element of two-degree alert(TD),pre-alert and up-alert applied tothe detection and the control in the fire system. An example in the paper deduces the logical expres-sion designing TDA and the hardware logic circuit is given. The paper also presents the software pro-gram realizing TDA utilizing the single chip microcomptiter(87C48),     

大型粮食干燥塔的自动控制

本文通过DM—150型干燥过程控制仪在DLG－500型干燥塔的成功应用,详细介绍了该自动控制系统的原理、性能、特点、操作过程及使用效果．     

FAST ADAPTIVE FILTERING ( FAF ) FOR THE PROCESS DETECTION CONTROL SYSTEMS

The limitation of LMS adaptive noise cancelling (ANC ) is analyzed here. Based on the discussing of general signal and noise model of process detection control system, a fast adaptive filtering(FAF) is proposed on the basis of modelling the correlativity between the noise and it's correlative noise with the view of large noise. Fast transversal filtering ( FTF ) adaptive, algorithms is used to imitate the correlative modelling. Both simulation and experiments show that the method presented in this paper is suitable for the process detection control system , and it exhibts better results than the LMS noise cancelling method.     

PLANNING AND IMPLEMENTATION OF FIRE PROTECTION FOR HOSPITALS

This paper discusses the risk and features of conflagration in hospitals,the spec-ification and implementation of fire protection system,the measurement and test of fire-fightingsystem and evacuation against ernergency.     

粮仓窗户远程自动控制系统设计

设计出一种粮仓窗户远程自动控制系统。根据仓内外的温度和湿度变化,自动开启或关闭窗户及通风机械,实现粮仓的自动通风,自动控制。该系统可与粮情检测系统、通风控制系统等结合,组成粮仓自动化管理系统。     

MACHINE PARAMETER IDENTIFICATION AND FAULT DETECTION FOR THE ALTERNATOR SYSTEM

In this paper, the machine( physical) parameters of the alternator system are on-line estimated on the basis of the derived system continuous-tims model, using Recursive Least-squares Estimation and Inverse Calculation Method proposed by Authors. Therefore, the estimated machine parameters can effectively track the changes of their true values and accomplish the fault detection for the alternator system. This paper gives a new way for machne parameter estimation and fault detection of the alternator systems.     

A NEW DISCONTINUOUS CURRENT MODEL FOR SCR DC MOTOR SPEED CONTROL SYSTEM AND CURRENT ADAPTIVE CONTROL

The paper presents a new approximative model suitable to discontinuous current and continuons current in the three-phase controlled bridge rectifier DC motor control system. This model offers a new approach for discontinuous current adaptive control.As an example of application of the model, digital simulation results of discontinuous current adaptive control in a double-closed-loop control system are presented.     

Repression of the Interference in the Wigner Distribution and the Algorithm

Because the present Architecture Fireproofing Technique Criterion for Auto-Detection and Alarm Systems in Atria is one with faults, it can't satisfy the needs of practical use. According to the forms of atrium and the characters of gas flow, an Auto-Detection and Alarm System suitable for the atria is investigated. The aim of this paper is to discuss the perfect design method for the Auto-Detection and Alarm Systems in Atria.     

A NEW COMPUTER DATA ACQUISITION AND COMMUNICATION SYSTEM FOR ENVIRONMENT PROTECTION FIELD

A new computer data acquisition and communication system is proposed in this paper. The system has the following charatcrjstics: the master station has the double functions of monitoring and controllng the slave stations. The system has low bit erro rrate of data communication, high catch rate of data acquisition and the strong operational reliability. The two years practical operation has proved that the system proposed is effective for the environment-protection field.     

A SELF-TUNING CONTROL FOR A PARALLEL AC/DC POWER SYSTEM

Based on a non-linear system model, an adaptive control methodology is presented for a parallel AC/DC power system by means of on-line recursive parameter identifications. Taking the advantage of rapid power regulatiing ability of the DC power system and combining with the generalized minimum variance self-tuning control principles, the dynamic qualities of the controlled system has been greatly improved. Using SISO form makes the control system very simple to implement. Through the design, simulation and analysis of the self-tuning control system for a practical example, it shows that the self-tuning control strategy is very promising for AC/DC power systems.     

A METHANE ALARM AND POWER-OFF CONTROL DEVICE CONTROLLED BY ASINGLE-CHIP MICROCOMPUTER

This paper presents the structure and main function of a methanealarm and power-off control device controlled by a single-chip microcomputer,which is first used in China.This paper mainly discusses the circuitry and work-ing principle of a computer and how to solve some special problems when the single chip microcomputer is used in a coal mine where methane exists.     

粮库智能综合显控平台设计与应用

随着粮库仓储管理向信息化与智能化的方向发展,智能通风、智能气调、光伏低温储粮等智能化系统已经受到粮库等粮食收储企业的广泛关注。对粮库智能综合显控平台的设计与应用进行阐述,着重介绍了其在温湿度测控、气调测控、储粮害虫测控的实现应用,并展望了其在智能化粮库建设中的发展前景,以期为该系统在智能化粮库建设中更广阔的应用提供参考。     

简易温控装置在轴流风机保水降温通风中的运用

轴流风机常用于保水降温通风,通风时间相对延长,把握最有利低温时机较难,保管员工作量相对增大,将简易温控装置应用于轴流风机保水通风过程中,既能解决把握低温通风时段难和保管员工作量相对增大的问题,又能达到降温、保水和降低通风单位能耗的目的。     

略论加强我国粮食流通宏观调控体系建设

粮食流通宏观调控体系建设对规范我国粮食市场秩序,提高粮食流通效率,保障粮食供应,实现粮食安全和促进经济社会协调发展具有十分重要的作用。通过阐述宏观调控体系建设与粮食安全的密切关系,提出了粮食流通宏观调控体系建设的目标和原则,并对粮食流通宏观调控体系构成要件进行了概括和分析,在此基础上,就如何构建符合我国国情的粮食流通宏观调控体系提出了具体的建议。     

储藏产品害虫生物性防治技术研究进展

生物性防治技术是农产品储藏保护中不可缺少的一项防治措施，纵观近年来在国内外发表的有关研究文献，包括第6，7，8届国际储藏产品保护学术会议（IWCSPP），气调熏蒸学术会（CAF）和国内外有关刊物对生物性防治技术的报道如昆虫性激素、病源微生物、天敌昆虫，抗虫育种等在农产品产前产后保护措施中都有一定的实用价值，有的已成为当前国际上农产品保护中的热门课题，为此特就国际上生物性防治的研究现状作一简要综述，并对有关问题提出一些看法。     

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.     

ZC—4型微机测温测湿系统在粮情检测中的应用

文章报导了ZC—4型微机测温测湿系统在储粮检测中的应用情况。结果表明:该系统重复测量稳定性好,能准确有效地反映粮堆内部不同部位的温度变化及仓内外相对湿度的变化情况;测量快速、方便,储量大,节约费用,具有明显的社会效益和经济效益。