磁场对姬松茸J1特性的影响

两种还原剂不同浓度和磁性材料十种组合方式进行栽培姬松茸J1的结果表明,在单一的50mg/kg的硫合剂的作用上栽培姬松茸J1在氨基酸的含量、产量、镉含量分别比对照提高16%～22.2%、提高6.7%、降低23.2%～27.4%,通过磁性物质和硫合剂50mg/kg共同作用比单一使用硫合剂50mg/kg的作用姬松茸子实体镉的含量下降21%,在氨基酸含量没有明显的变化,而产量呈略微下降的趋势,通过F检验镉含量下降达到极显著的水平,选择恰当的还原剂在磁性环境中不仅能提高其生长量和氨基酸,而且还能促使姬松茸子实体镉含量降低目的。     

Study on CAD Approach in Die''s Manufacturing by Sheet Metal Layer for Layer through Gluing

Based on the principle of material incress manufacturing, a new idea of the die's construction manufactured by sheet metal layer for layer through gluing is presented, and a CAD approach of the die's three-dimensional surface creating and the scattering handling is discussed in this paper. It is also analysised that layer's separation of the three-dimensional CAD model, change and transmission of separating layer's data, and mechanical properties of die's construction manufactured by sheet metal layer for layer through gluing. The results of the research indicate that die's manufacturing by sheet metal layer for layer through gluing is feasible and effective one of material incress manufacturing technical.     

THE DEVELOPMENT OF ON-LINE AUTOMATIC MEASURING EQUIPMENTS OF INCREMENTAL LINEAR SENSORS

The auto-measurement of incremental linear transducer by a micro-computer is described and the data of the incremental linear transducer are gained by a computer. Under the control of the computer programme, the on-line datum processing is done and the power spectrum of the data is analyzed by the computer. Thus the auto-measurement of the incremental linear transducer is realized.     

THE EFFECT OF THE STRESS OF LONGWALL AND STRUCTURE OF COAL ON THE BUMP OF COAL AND METHANE

The problems that the bump of coal and methame in the mine is contraled by the stress of longwall and that the coal and methane bump in the mine is affected by the physical properties of the coal are analysed and discussed through some specific bump cases. It is shown that the compressive stress, the content of the methane of the coal, and the bump of coal and methane are directly affected by the content of the ash and the volatile of the coal.     

Application of Self-tuning Models to Air Handling Units for Fault Detection

Building management control systems (BMCS) are widely employed in modern buildings. The huge amount of data available on central stations and outstations provide rich information for fault diagnosis of HVAC systems. An online fault diagnosis method for variable air volume air handling units was presented using self-tuning HVAC component models. The model parameters are tuned online by using a genetic algorithm (GA) which minimizes the error between measured and estimated performance data, so high modeling accuracy is assured. If the error between measured and estimated performance data exceeds preset thresholds, it means the occurrence of faults or abnormalities in the air handling unit system. The statistical method of selecting thresholds also is presented. The fault detection method was tested and validated using data collected from real HVAC systems. The results of validation show that the fault detection method can be integrated in BMCS systems to detect faults in air handling unit systems efficiently.     

A NEW METHOD FOR AMELIORATING INDOOR THERMAL ENVIRONMENT BY DEHUMIDIFYING

The climate in the region of the Yangtze River is sultry in summer and wet and cold in winter. The conventional building measures are shading in summer and insulating in winter,which have heen gotten some effects. Becasue the sultry,wet and cold sensation still affect, the indoor thermal environment can not get an ideal improvement. This paper shows that the new method by dehumidifying is the most effective and the most economic.     

ON THE INTERFACE BETWEEN AUTOCAD AND THE ADVANCED LANGUAGE

This paper comprehensively discusses the interface between AutoCAD and the advanced language. It presents three main ways: by means of . DXF file, SCR file and AutoLISP language. The former two have been used by some people in China. This paper presents the method with its programs for its accomplishment. As to the last one, the author has developed its application with the method for its accomplishment, the problem and the handling method for deletion of library function. AutoCAD can be used as support software for microcomputer CAD. This paper provides some references for technical personnel concerned. The programs in this paper have been all verified by IBM PC/XT, GWO520-CH. The pictures are drawn by DMP-56A.     

MEASURING PROBABILITY OF SKY BRIGHTNESS IN CLASSIFICATION BY THE AVERAGE INSOLATION

According to the daily change law from curves for percentage insolation,this paper presents a new formula of the average insolation in the zones where the insolation is more than 70%. By means of the hourly observing data during two years for solar direct ratiation, cloudage and sunshine condition in seven zones different lighting climate,considering the vaper pressure and the altitude present the function of percentage insolation and the probability of four sky brightness classification,this formula has a certain precision to be proved by observation.     

杉木人工林生物量和生产力研究

本文在建立杉木人工林生物量和生产力数据库基础上,分析了区域尺度杉木人工林生物量、生产力、各器官分配比例及其与林龄的关系。结果表明,区域尺度杉木人工林总生物量和林龄之间有很好的相关性,可用Chapman-Richards生长方程表达;利用森林资源清查中的蓄积量数据计算的各龄级生物量比实测数据更能代表林分的实际平均生长情况;各器官生物量分配比例随林龄的变化规律因器官而不同;杉木人工林平均生产力的变化趋势落后于连年生产力近十年,因此使用平均生产力并不能真正代表杉木人工林每年的实际生产力变化情况。此结果为第二次土地利用变化和林业温室气体清单的编制提供了基础数据,以提高我国清单编制的质量。     

THE PRINCIPLE AND TECHNIQUE FOR GEAR PLANING BY DISCONTINUOUS GENERATING

The principle of gear planing by discontinuous generating is introduced and two kinds of techniques are presented based on this principle. Examples are given to show that both the accuracy and efficiency of the new techniques are higher and the cost is lower that those of gear hobbing and gear shaping.     

Explicit Formulation of the Back-Propagation and the Robustness Analysis of Feed-Forward Neural Networks

The compact explicit formulation of the Back-poopagation is presented,based onwhich the robustness of the feed-forward neural networks is analysed,and some reference priciplesfor desisning a robust feed-forward net are provided.     

ON THE RELATION BETWEEN THE ROTATION RATE AND NOISE LEVEL FOR BKY63-11 MINE AXIAL AUXILIARY FAN

The noise of mine axial auxiliary fan is comprised of many noise sources. In this paper, a synthetic analysis mode between the speed of revolution and A-weight noise level for BKY63-11 mine axial auxiliary fan is presented and is proved to tally with the actual situation by test.Meanwhile, the maine noise source of axial auxiliary fan is analysed.     

THE OPTIMIZATION ON THE POSITON OF BEARING-POINTS IN SPACE TRUSSES SUPPORTED BY FOUR COLUMNS

This paper studies the optimization on the position of bearing-points in space trusses supported by four columns,taking the cross-sectionalareas of members,the positions of bearing-points and heights of space trusses as the design variables,and the weight of structures as the objective function.After a lot of calculation,the parameters of optimal cantilever lengths and heights of space trusses supported by four columns are presented.     

LABORATORY INVESTIGATION OF ESSENTIAL CHARACTERISTICS PARAMETERS FOR THE INDUCED-NOZZLE DEVICE

The standoff of a submerged jet is smaller than a non-submerged jet in general. In order to increase the standoff of a submerged jet, the induced-nozzle device is presented with its inducing mechanism analysed in this paper. Under the various inducing medium, the effect of the ratio d2/d1 upon the device's properties is measured. Some reasonable parameters are given. When d2/d1=2.0, approximate straight region of the curve of the jet center line stagnation pressure varying with the standoff is L/d1= l0~12 for inducing air. The induced-nozzle device is compared with the conventional nozzle for shotting some samples. Several applied possibilities of the device are discussed.     

THE STUDY OF THE RELATION BETWEEN COAL-GAS OUTBURST AND PHYSIC AND MECHANIC PROPERTIES OF COAL SEAM IN A COAL MINE

The experimental study of physic and mechanic properties of coal seam in a coal mine is presented, and the relation between coal-gas outburst and the strength, the elastic modulus, as well as the deformation property of coal seam is analysed on the basis of the experimental results.     

THE NEW METHOD-QL SYSTEM FOR MEASURING DYNAMIC ACCURACY OF THE DRIVETRAIN

The paper introduces a new method-QL system suggested for the first time by the author for measuring dynamic accuracy of gear cutting machine drivetrain. The system has many uses. It suits not only the measurement of mid-size machine tool but also the measurement of very slow speed, large ratio, large-size machine drivetrain     

夏玉米耗水量和耗水规律分析

在作物与水分关系研究中,产量是确定耗水量的重要因子,但不是唯一因子,要同时考虑水分利用效率和经济效益.本文在试验资料的基础上,研究了夏玉米产量和耗水量的关系,运用最优分割理论对水水利用效率进行最优分割:同时对不同水分处理的籽粒产量、秸秆产量、水分利用效率和灌水费用等进行综合评判,进而确定夏玉米耗水量指标.然后对不同生育阶段耗水规律和降水时间分布进行了分析.为夏玉米田间水分管理和进行气候评价提供依据.     

光谱反射在草坪草胁迫研究中的应用及前景

简述了光谱反射法的原理和特性,归纳了草坪草胁迫研究中常用的光谱反射指标,并着重分析了该方法在草坪草病虫害、干旱、践踏、营养、盐分等胁迫研究中的应用现状,认为该方法能快速、简单、精确的鉴定草坪草胁迫状况,是评估草坪草生理状态、预测其营养状况等的一种非常有效的分析手段,指出其在草坪胁迫研究中有广泛的应用前景。此外,还总结了光谱反射数据的转换和平滑处理方法,指出光谱反射数据的合理处理对相关性分析及预测模型建立的重要性,以期为国内草坪草生理研究者和草坪管理者提供一个新的方法和思路。     

基于灰色聚类法的大庆市油田开发区湿地水环境质量评价

探讨灰色聚类法在水质评价中的科学性,为大庆市油田开发区湿地水环境质量评价提供了方法学参考,并为松花江中下游水环境保护提供了相关依据。首先,分析了灰色聚类法、单因子污染指数法的基本原理,然后采用相关数学方法对各监测断面水质监测数据进行评价。结果表明,除万宝泡东北侧进水口、出水口桥下的水质为II类水质标准,龙凤湿地安肇新河为III类水质标准,水质较好外,其余监测点水质均为V类水质标准,水体污染严重。研究实例表明,相对于单因子污染指数法,灰色聚类法对水环境质量数据具有更高的利用能力及客观性。由于大庆市油田开发区周边有很多重要的湿地保护区,因此大庆市油田开发区湿地水质污染问题已不容忽视。