雷达罩复合材料铺层计算的数学方法

雷达罩复合材料的铺层设计直接关系到雷达罩复合材料的强度,现行的商用软件需要依赖结构铺层设计才能实现仿真分析,要针对结构铺层分别划网格、建模型,铺层设计的灵活性、通用性差。采用几何学原理和数据编程处理方法,将雷达罩纤维织物复合材料的平面经纬向依据不同的起始铺层角度并结合三维空间几何转换确定其在三维雷达罩模型上的实际方向,进行雷达罩复合材料铺层设计,将复合材料铺层方向投影到空间雷达罩复合材料的有限元模型中,确定复合材料的铺层角,将铺层设计显性化、通用化,并且增加复合材料铺层计算的灵活性,突破各种软件的约束。     

INSTRUCTIONS FOR PREPARATION OF MANUSCRIPTS FOR DIRECT REPRODUCTION

ABSTRACT

The bulk density of garlic slices at different moisture levels (ranging from approximately 3 to 65% MC wet basis) was determined by weighing the contents of a container of known volume. The porosity was calculated using its relationship with bulk and apparent densities. An analysis of variance (ANOVA) revealed that bulk density and porosity were affected significantly by moisture and slice thickness as well as the interaction of these variables. Bulk density varied in a positive linear fashion with moisture and thickness while a negative linear correlation was found for the calculated bulk porosity. The linear model met me adequacy criterion for characterising the behaviour of garlic. Using a laboratory unit, the vertical resistance to airflow through the product and die effect of moisture and slice thickness were investigated for an airflow rates of 0.09 to 1.2 m³/s-m². A higher resistance to airflow was noted for the wet product with the experimental data fitting to Shedd's model when the airflow range was divided into two sub-flow rates and to a modified Ergun's equation for the full range.     

渣池系统零排放改造措施

锅炉灰水从渣池溢流口直排,污染环境,堵塞下水道。分析锅炉渣池系统不能正常投用的原因,对锅炉渣池系统进行改造,减少生活水补充水量,消除渣池灰水溢流,解决下水道堵塞,实现渣池零排放。     

INSRUCTIONS FOR PREPARATION OF MANUSCRIPTS FOR DIRECT REPRODUCTION

ABSTRACT

We investigate experimentally the behaviour of the receding evaporation front during the drying of food products by measuring the temperature distribution profile within the potato slab. The effect of key process parameters on the receding speed of this evaporation front is investigated. We show that the square root of the drying time varies linearly with the transient position of the front. Also, the receding velocity of the front is seen to be related to the drying rate of the product as the front decelerates inward to the center of the material.     

PROPOSAL FOR A UNIFIED NOMENCLATURE FOR DRYING LITERATURE

ABSTRACT

In general, drying processes are described by the quantity of air humidity of the exiting gases. This approach is not possible however by the drying medium of water in steam drying, since the air humidity naturally possesses a constant value of 100%. This paper presents a model which represents the drying processes on the basis of the observation of temperature profiles of the material and energetic balancing of all components involved as well as the wall of the apparatus. The modeling differentiates three intervals: the condensation phase, the 1st drying period and the 2nd drying period. In addition, a validation of the model on the basis of experiments in an experimental plant DN100 belonging to the university is dealt with. The satisfying concurrence of the theoretical and practical results shows that, with the help of the theoretical model, discontinuous steam drying processes can be theoretically described with sufficient accuracy.     

串接石墨化用保温料的控制管理

串接石墨化炉用保温料对生产成本和产品质量具有重要的影响，本文通过合理地选用保温料，定期对使用中的保温料和炉底保温料进行处理，使吨电极消耗保温料150kg左右。     

一步熔融还原炼铁流程的分析

本文对一步熔融还原炼铁流程进行了分析，考察了流程的能量分布情况，为一步熔融还原炼铁流程的节能和可行性研究提供了依据．     

一种确定陶瓷材料Weibull模数的简便方法

采用ＭｏｎｔｅＣａｒｌｏ数值模拟方法对陶瓷材料Ｗｅｉｂｕｌ模数点估计值ｍ与断裂强度测试结果的变异系数ｃｖ之间的对应关系作出了定量的描述,进而提出了一种由ｃｖ直接确定陶瓷材料Ｗｅｉｂｕｌ模数的简便方法．分析表明：由这一新方法所确定的Ｗｅｉｂｕｌ模数点估计值ｍ与由常规点估计方法获得的ｍ之间在统计学意义上没有显著差异．     

矿热炉用电极的损坏机理分析

主要对生产工业硅的矿热炉用电极作了介绍,对其在使用过程中发生的断极机理作了分析,亦对电极的防护措施作了探讨,供矿热炉各级管理人员参考,其中原理亦适用于其他类型的矿热炉.     

流动型量热法测量汽化热的实验研究

建立了流动型量热法汽化热测量装置 .该装置测量压力可达 6MPa ,温度范围 2 6 0～ 480K .以所建的装置测量了纯水的汽化热 ,测量结果与文献值比较其偏差在± 0 .85 %以内 ,证明了实验装置的可靠性 .利用该装置测量了制冷剂的替代工质HFC134a和HFC12 5的汽化热 ,为替代工质的筛选和工程设计提供了可靠的基础数据