Numerical Simulation of Flow field and Temperature field in Combustion Chamber Widened Suddenly

The flowfield and temperature field are numerically Simulated by the mathematical model of the fluid flow and heat transfer in circular combustion chamber widened suddenly. The distributions and influence factors of the flow field and temperature field are studied in it. The results have the guiding significance for the design of combustion chamber. The mathematical models can serve as the quantitative analysis methods for design.     

EFFECT OF MICRO-GALLIUM ON THE INTERGRANULAR SEGREGATINN OF PHOSPHORUS IN CARBON STEELS

The effect of small amounts of gallium on the intergranular segregation of phosphorus in carbon steels is discussed, with the help of the impact test, fracture morphology and micro-structure analyses, combined with composition analysis on the fracture surfaces by Auger electronspectrometer. The results show that gallium in the steel with a content of gallium more than ten thou-sandth can suppress, to some extent, the intergranular segregation of phosphorus and retard the tempering process. As a result, the temper embrittlement of the steel disappears and the embrittlement transition temperature declines.     

OPTIMAL CONDITIONS OF DIFFRENTIAL MULTIOBJECTIVE PROGRAMMING IN BANACH SPACES

In this paper,by the use of Farkas lemma and its inve-rse proposition,the generalized Kuhu-Tuoker conditions for the existanceof strong minimum point in differential multiobjective programming inBanach spaces and the existance of sufficient condition of weak Paretominimum Foint are derived.     

以粮温实测数据为例探讨低温储粮的可行性

通过对高大平房仓粮温进行跟踪检测，分析比较了粮温变化情况，并探讨了低温储粮的可行性。     

基于模糊逻辑控制的温室温度控制技术的研究

目前对温室环境控制很难建立一个精确的数学模型，而且温室需要控制的环境因子有很多，采用传统的控制方法很难达到理想的控制效果。本文介绍了以温度作为优先控制的环境因子，采用模糊逻辑控制方法，对温室温度进行调控。     

Remote sensing of biotic and abiotic stress for irrigation management of cotton

The applicability of commercially available remote sensing instrumentation was evaluated for site-specific management of abiotic and biotic stress on cotton (Gossypium hirsutum L.) grown under a center pivot low energy precision application (LEPA) irrigation system. This study was conducted in a field where three irrigation regimes (100%, 75%, and 50% ET_c) were imposed on areas of Phymatotrichum (root rot) with the specific objectives to (1) examine commercial remote sensing instrumentation for locating areas showing biotic and abiotic stress symptomology in a cotton field, (2) compare data obtained from commercial aerial infrared photography to that collected by infrared transducers (IRTs) mounted on a center pivot, (3) evaluate canopy temperature changes between irrigation regimes and their relationship to lint yield with IRTs and/or IR photography, and (4) explore the use of deficit irrigation and the use of crop coefficients for irrigation scheduling. Pivot-mounted IRTs and an IR camera were able to differentiate water stress among irrigation regimes. The IR camera distinguished between biotic (root rot) and abiotic (drought) stress with the assistance of groundtruthing. The 50% ET_c regime had significantly higher canopy temperatures than the other two regimes, which was reflected in significantly lower lint yields when compared to the 75% and 100% ET_c regimes. Deficit irrigation down to 75% ET_c had no impact on lint yield, indicating that water savings were possible without reducing yield.     

滚珠丝杠的温升及热变形对策

对滚珠丝杠的温升及热变形的对策进行了探讨，提出解决温升和热变形的方法，为滚珠丝杠的设计、安装、使用和维修提供参考。     

寒带无人值守机房冬季节能及补热方式

黑龙江冬季寒冷且时间长，各无人值守机房在冬季将消耗大量电能来取暖。由于无线移动基站很多，采取节能方式将降低运行成本。为此，介绍了一种节能和补偿热量方式，其实际应用效果显著。     

用计算机进行小麦赤霉病的预测预报

根据苏北某市农业局提供的十几条与小麦赤霉病有关的气象经验。用1971年以来的气象数据建立几种数学囚子模型；将数学因子与赤霉病实际发病的结果数据进行相关分析，提取相关性较好的数学因子组成相关因子；运用相关因子分别采用4种预测预报方案进行预报。