THE OPTIMAL DESIGN CALCULATION OF te(MC)MEDIA FILTER

This paper introduces formula total water headloss of MC media filter anddiscusses the parameters of design calculation of MC media filter through the experiment.In the end,the optimal design calculation method and its program diagram are given.The method is important toguide the design of MC media filter.     

粮堆高度对机械通风粮层阻力的影响

粮层阻力是设计储粮机械通风系统的一项重要参数。本文主要分析了粮堆高度对粮层阻力的影响,通过试验进行实测,并采用多元回归的方法,得出了新的经验公式P＝ahbvc。     

A PRELIMINARY STUDY OF THE AVERAGE SKY BRIGHTNESS MODEL

Starting from the optical factors of Climate and on the basis of CIE formulasof brightness distribution for clear and overcast sky,this paper suggests a kindof formula which can be used to compute brightness distribution on average skybrightness.Besides,it proposes a simple method by which it is easy to carryout the design of natural lighting under the condition of average sky brightnessmodel.     

基于ARM平台的多功能滴定软件设计

介绍了一种基于ARM平台的多功能滴定软件设计方法。说明了滴定系统的结构和ARM软件架构,描述了可编辑通用方法框架的实现过程、滴定方法的工作流程和公式解析引擎的设计原理,最后给出了数据处理的图形化结果。该软件具有友善的人机界面,稳定性好,精度高。     

数学建模方法在饲料配方设计中的应用

用数学建模的方法建立了饲料配方设计的数学模型,通过对0～6周龄的蛋用雏鸡饲料配方的设计及采用简便的EXCEL方法求解的介绍,为配合饲料生产提供了一个科学、简便、实用的配方设计方法。     

THE FORMULA OF SUNSHINE PERCENTAGE

This paper presents the formula of sunshine duration in those plaees where sun-shine duration is more than seventy per cent. This formula is obtained from the sunshine obeervationrunning at seven obeervation stations of China for five years. And after analysing the changes oftime and place, this formula is very precision.     

RESEARCH ON SEDIMENTATION TECHNOLOGY OF CHEVRON-SHAPED TUBE

Research results show that chevron-shaped tube has adva-ntages of better hydraulic condition needed for sedimentation and adapta-bility for treatment of raw water turbidity.This paper points out the wayto select the construction parameters of chevron-shaped tube.The contrastresearch between chevron-shaped tube and honeycomb-shaped tube has beendone.The formula of hydraulic characteristic parameter of chevron-shapedtube is given.This formula sets out a theoretic base for practical applicationof chevron-shaped tube.     

Seismic Shear Strength of Concrete Hollow Block Masonry

According to some problems existed in current Chinese codes for design of seismic shear strength of concrete hollow block masonry, the curve of shear strength of concrete hollow block masonry under shear-compression loading, including descent segment, was presented by theory of failure region and test results of 58 concrete block masonry walls under shear-compression loading. And the design seismic shear strength formula of concrete hollow block masonry, which has reliability guarantee, was deduced. Compared with current Chinese codes, the design seismic shear strength formula of concrete hollow block masonry not only can perfectly simulate the shear-friction, shear-compression and diagonal compression failure modes, but also avoid unreasonable and unsafe calculation of seismic shear strength of concrete hollow block masonry, which can be applied to design of tall reinforced concrete masonry structures.     

ON THE TRANSPORTATION AND COEFFICIENT OF TURBULENT DISPESJON OF DUST IN MINE AIRWAYS

In this payer , a summary of the recent progress for reseach on dust transportation , dust deposition and turbulent dispersion in mine airways is presented. A mathematical model is provided for deposition and turbulent dispersion of dust in mine airways. The calcuating formula Ex=49.528 a Ua for coefficient of longitudinal turbulent dispersion is derived theroetically .     

茅根冬瓜复合清凉饮料的研制

以茅根、冬瓜为主要原料,采用正交试验设计方案对饮料配方进行研究。结果表明,茅根冬瓜复合饮料的最佳配方为茅根汁添加量25%,冬瓜汁添加量10%,白砂糖添加量8%,柠檬酸添加量0.006%,稳定剂海藻酸钠添加量0.05%,在此条件下可以得到一种色泽清透、清甜美味、适合各类人群的清凉饮料。     

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.     

THE STUDY OF SKY LUMINANCE DISTRIBUTIONS

This paper suggests the formula about sky luminance distribution on pseudoovercast sky. After testing and verifying,it is a fact that this formula and actual measure about pseudo-overcast sky luminance distribution are nearly identical. This paper also suggests unified fornula expressing four types of sky luminance distributions(CIE clear sky,pseudo-clear sky,pseudoovercast sky and CIE orercast sky). As a result,it is of great advantage to the calculation of vertical illuminance.     

Estimation of Earth Work Volume and Design Elevation in Large Earth Work

In this paper,the approximation calculation method based on calculation model of earthwork formula of tetragonal prism is described. The optimization design elevation in large earthwork can be determined by this method. Through introducing a set of different design elevations, the difference between and sum of the total excavation and the total fill can be calculated. An economical analysis is carried out on the design elevation chosen with little value for both cases by numerical values comparison. The elevation with the lowest cost is taken as the optimal design elevation.     

RESEARCH ON THE SHEAR RESISTANT BEHAVIORS OF STEEL REINFORCED CONCRETE RESTRAINED BEAMS

In order to probe into the shear resistant behaviors ofsteel reinforced concrete(SRC)restrained beams,three test beams underconcentrated loads have been tested.A full range analysis of the testbeams is conducted by using nonlinear finite element(NLFE)techique,and a good agreement with the experimental results is achieved.Theshear resistant mechanism of SRC restrained beam and the main factorsaffecting its shear strength are analysed.It is found that when theavailable shear strength formula for simply supported SRC beams is usedto calculate the shear strength of SRC restrained beams,the result turnsout to be conservative,so it is suggested that the shear strength of SRCrestrained beam could be calculated by the corresponding formula ofsimply supported SRC beam,adopting calculation shear span ratio.Thepractical formula is proposed in the paper.     

Average surface roller pressure calculation method of roller mill

Hydraulic system pressure, contact surface between grinding roller and materials and grinding roller force of roller mill are analyzed. A new roller pressure calculation method named average surface roller pressure calculation method is proposed,and the corresponding theoretical formula is derived from three different perspectives, including roller pressure numerical calculation, stress and strain of main components and mill power through the calculation of real samples. The average surface roller and traditional average material roller pressure are compared to verify the correctness and accuracy of the proposed method. Design parameters such as the grinding roller structure, material maximum size, layer height and working pressure of the hydraulic system on the influence of roller are analyzed according to the formula of roller pressure. The research results provide theoretical basis for the selection of design parameters and the design calculation of structural strength for roller mill.     

改进遗传算法在饲料配方设计中的应用

针对现有饲料配方软件的局限性,以白绒山羊饲料配方为例,提出一种基于改进遗传算法的求解方法。与标准遗传算法相比,采用随机联赛选择替代轮盘赌模型,优化了选择策略;采用不同的随机数交叉和高斯变异,改进了交叉算子与变异算子。测试结果表明,该方法具有良好的运算效率,拓宽了搜索空间,提高了对重点区域的搜索能力,降低了成本,为复杂问题的优化提供了一种新的思路。     

AN ANALYSIS OF STIRRING ENERGY OF BOTTOM BLOWN O_2 AND CH, IN THE COMBINED-BLOWN CONVERTER

A calculation formula of stirring energy in liquid steel is set up for bottom-blown O2 and CH,| in the combined blown converter, and the main factors which have an effect on stirring energy and the variation law of stirring energy in steel-making process are discussed.     

Behavior and Design of High-strength Bolt in Tensile Connection

The tensile strength of high strength bolt is affected by many factors, including prying force. The prying force can result in the increment of bolt force, for which the connection failed ahead of time. Several methods are presented for calculating the prying force. In the China's "Code for Design of Steel Structure" (GB50017), there is no formula for calculation of prying force and a factor of 0.8 is considered in formula for tensile strength of bolt for taking the prying force into account. It is proposed that the design value of tensile resistance for high strength bolt should be increased.     

黄冠梨汁无硫护色剂配方的筛选

以黄冠梨为试材,采用柠檬酸、抗坏血酸和D-异抗坏血酸钠3种无硫护色试剂对黄冠梨汁进行护色试验,在单因素试验的基础上,应用响应面试验筛选黄冠梨汁的最佳无硫护色剂配方组合。结果表明:3种护色液抑制黄冠梨汁褐变的效果由强到弱依次是柠檬酸>抗坏血酸>D-异抗坏血酸钠;对黄冠梨汁褐变抑制作用最大的是柠檬酸,抗坏血酸次之,D-异抗坏血酸钠最小;最佳复合护色剂配方为0.22%柠檬酸+0.15%抗坏血酸+0.50%D-异抗坏血酸钠,按此配方制得的黄冠梨汁褐变度为0.8132±0.0521,与预测值接近。     

Research on the Law of Highway Debris Flow Moving in Control Structures

Debris flow is a kind of typical water ruins to highways, and it is a dynamic load for highway water ruin. The authors, following the moving law of debris flow and characteristics of highway ruin, put forward reasonable section shape of high - speed drainage trough. Then, according to the energy conservation principle and horizontal throwing theory, the authors established a calculation formula for the throwing distance. The results of the calculation formula given in this paper offer a solution for load calculation and control effect evaluation problems and provide theoretical foundation i to structure design and disease control of debris flow along the highways.