具有不均等负重合量的非对称气动伺服阀压力特性研究

研究了一种具有不均等负重合量及均等负重合量的新型非对称气动伺服阀的压力特性。该非对称气动伺服阀的下游节流口面积为上游节流口面积的两倍。伺服阀的压力特性及零位压力取决于下游和上游开口面积比例和阀的负重合量。具有均等负重合量的伺服阀在零位时泄漏流量最大;具有不均等负重合量的伺服阀在零位附近某处时泄漏流量最大。理论结果和试验结果十分吻合。

具有对称不均等负重合量的气动伺服阀特性

分析了具有负重合量的气动伺服阀特性及各节流口的流动形式.理论分析和实验结果表明:具有均等负重合量的气动伺服阀的零位压力约为供气压力的80%;当供气侧对称不均等负重合量小于排气侧负重合量时,零位压力小于供气压力的80%;当供气侧对称不均等负重合量大于排气侧负重合量时,零位压力大于供气压力的80%;具有对称均等负重合量或对称不均等负重合量的伺服阀的最大泄漏量发生在零位附近.

具有对称均等负重合量的气动伺服阀零位流动状态分析

分析了具有对称均等负重合量的气动伺服阀在不同供气压力时上游供气节流口和下游排气节流口的流动状态。排气压力为一个标准大气压,供气压力小于0.2374MPa时,零位时的上游两个供气节流口和下游两个排气节流口均为亚音速流动;供气压力等于0.2374MPa时,零位时的上游两个供气节流口为亚音速流动,下游两个排气节流口处于临界流动,即亚音速流动和超音速流动的分界点;供气压力大于0.2374MPa时,零位时的上游两个供气节流口为亚音速流动,下游两个排气节流口为超音速流动,且在零位处的负载压力为供气压力的80.75%。

“绿色重合性能量突变体系”新概念的提出及理论研究

指出了用绿色能量场作为变量代入动力学系统数学模型中的输入变量、状态变量及输出变量后,问题的关键是启动可控制的输入能量变量场或激励信号是否能撬动绿色能量状态变量的突变而输出绿色能量变量,建立动态数学模型、取出能量应用。

绿色重合性能量突变体系理论及实验研究

针对探索和开发新型的绿色能量,提出一种基于动力学与控制理论的无环境污染的绿色重合性能量突变体系及其动态数学模型,利用绿色能量场作为变量代入该体系动态数学模型中的输出变量、状态变量及输入变量,设计出与之匹配的实验装置,启动可控制的输入能量变量场(或激励信号)来撬动绿色能量状态变量的重合突变从而输出新的绿色能量变量。通过试制实验装置及其实验,确立了每输入一个控制变量其输出变量都有与之对应的确定值关系,故该系统场为单值连续函数,表征了系统的能量变化大小,校核了该实验系统为被状态函数确定的系统,为该体系研究方法奠定了基础,拓宽了动力学与控制理论的应用领域,为新型绿色能量开发提供一个新思路。

圆盘剪纵剪钢带边缘质量影响因素

论述了圆盘剪纵剪过程及正常剪切断口特征,对圆盘剪纵剪过程中因侧间隙、重合量等参数设定不当,可能出现的纵剪钢带边缘质量问题进行了总结,为调整圆盘剪剪切参数提供了参考。

圆盘刀纵剪铝合金带材工艺方法探析

介绍1500 mm活套动力纵剪机的特点,对圆盘刀材质的要求,圆盘刀的组刀、配刀方法,侧间隙和重合量的优化调整做了深入探讨,总结了合理使用圆盘刀提高铝合金带材剪切质量的方法。

管线钢管现场焊缝宏观检验方法

为了解决管线钢管现场焊缝宏观检验传统方法存在的成品管浪费量大、耗时长、试样修磨精度不高造成腐蚀时间延长以及环境污染等问题,提出了一种基于投影原理的现场焊缝快速检验方法。该方法可快速完成试样制备以及现场焊缝焊偏量、重合量和宏观质量的快速检测。相比传统检测方法,该方法不会造成成品管浪费,腐蚀操作安全环保,检测效率能提高十几倍甚至数十倍。采用手机软件可进行图像采集、数据处理以及焊偏量和重合量的测量,检测精度和宏观照片清晰度等同实验室焊缝金相宏观检验水平,远高于现场酸蚀法焊缝宏观检验。

消除圆盘剪剪切造成的铝板面划伤

结合生产实践,分析了纵剪圆盘剪剪切铝板造成板面划伤的原因,并提出了改进措施。

影响圆盘剪剪切精度的主要因素

文章介绍了影响圆盘剪剪切精度的主要因素:圆盘刀的直径和厚度、轴向侧隙、重合量、刀轴精度等,结合工作中的实践经验对这些主要因素进行分析和探讨,并提供相关可参考的数据及计算公式。通过合理的设计、制造及使用可以提高圆盘剪剪切带材的精度。

关于圆盘剪剪切工艺的探讨

简要介绍了本钢浦项冷轧薄板有限责任公司重卷机组圆盘剪的剪切工艺,由于圆盘剪调整不当而造成的剪切缺陷。同时,提出了避免出现剪切缺陷而采取的应对措施。

Quality Synthetic Evaluation of Urea Formaldehyde Foam Substrate in Turf Establishment

[Objective]The aim of this study was to explore the feasibility of three kinds of urea formaldehyde foam substrate in tall fescue establishment as well as to study on evaluation of turf quality.[Method]The visual estimates,ecological quality estimates and utility quality estimates were used as the 1st level indicators,and the density,color,texture,uniformity,green period,cover degree,biomass,emergence energy,growth rate and turf-forming time were used as the corresponding 2nd level indicators.With T.L.Satty＇s method Analytic Hierarchy Process（AHP） and the fuzzy synthesis evaluation method,the weight ratio of matrix was obtained and the synthetic evaluation result was accorded with facts,then it could be regarded as the satisfying value of weight.[Result]The quality of three covering soil treatments was better than that of uncovering treatment and conventional treatment,the quality synthetic evaluation of F1 was the best,which was about 0.770.[Conclusion]Urea formaldehyde foam substrate showed high quality for turf establishment,which could be further spread and applied.

Combining Ability Analysis on Yield Traits of Recombinant Inbred Lines in Hybrid Rice

A population of 140 recombinant inbred lines at F8 generation were obtained after seven successive generations of self-pollination using single seed descent（SSD） method from the F2 hybrids of three-line restorers Luhui 8258 with high combining ability and Yanghui 34. Then, the 140 inbred lines obtained above and their parents Luhui 8258 and Yanghui 34 were crossed with three different types of cyto-plasmic male sterile（CMS） lines（Gang 46 A, Ⅱ-32 A and Lu 98A） according to NCⅡ design. The resulting 426 combinations were planted at Deyang and Suining bases to test the combining ability and inheritance of five yield traits： yield per plant, panicle number per plant, filled grain number per panicle, seed setting rate and 1 000-grain weight. The results showed that the variances of both general and specific combining abilities of the five traits all reached a significant or extremely significant level at the two sites. The broad and narrow heritability of the yield traits（except 1 000-grain weight whose broad and narrow heritability were both over70%） were all below 50% at the two experimental bases, suggesting that the four traits were easily subjected to environment influence. Very significant positive correlation of general combining ability was found between yield per plant and other traits except 1 000-grain weight. The general combining ability variance showed a normal distribution among the recombinant inbred lines at two sites, right in line with inheritance of quantitative traits. So, the genes controlling rice general combining ability can be targeted by QTL mapping.

Measurement and engineering application of adsorbed water content in fine-grained soils

In this paper,the content and density of adsorbed water in fine-grained soil are determined.According to the test results,the calculation method of compaction degree of the solid-phase and void ration of soil is improved.Four kinds of fine-grained soils from different regions in China were selected,and the adsorbed water content and density of four kinds of fine-grained soils were determined by thermogravimetry and volumetric flask method.Furthermore,SEM and XRD experiments were used to analyze the differences in the ability of each soil sample to absorb water.In order to study the compression characteristics of adsorbed water,four saturated soil samples were tested by consolidation method.The results show that the desorption temperature range of the adsorbed water and its density were equal to 100−115℃and 1.30 g/cm^(3),respectively.Adsorbed water plays a positive role in keeping the compressibility of fine-grained soil at a low rate when it has high water content.Besides,adsorbed water can be a stable parameter and is difficult to discharge during the operation period of subgrade.The settlement of fine-grained soil embankment is predicted by engineering example,and compared with the result of conventional calculation method.The results show that it is more close to the field monitoring results by using the improved void ratio of soil as the parameter.

Ground State Properties of Superheavy Nuclei in Macroscopic-Microscopic Model

The ground state properties of superheavy nuclei are systematically calculated by the macroscopic-microscopic (MM) model with the Nilsson potential.The calculations well produced the ground state binding energies,α-decay energies,and half lives of superheavy nuclei.The calculated results are systematically compared with availableexperimental data.The calculated results are also compared with theoretical results from other MM models and fromrelativistic mean-field model.The calculations and comparisons show that the MM model is reliable in superheavy regionand that the MM model results are not very sensitive to the choice of microscopic single-particle potential.

Development and application research of light weight heat treated B-grade bulletproof steel

The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthening theory.The puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling system.Such B-grade bulletproof steel plate has fine tempered lath martensite structure.The shooting and certification test results showed that the shoot resistance of B-grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles(GA 164—2005).In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden,the weight of the developed B-grade bulletproof steel plate can be decreased by 8 %under the same shoot resistance condition.It will be meaningful for cash truck and anti-hijacking vehicle to realize light weight,energy conservation and emission reduction.

Coal washing improvement by determination of optimal mixture of feed blends

Coals from different mines are feed in the Zirab plant without any control on weight percentage blending of them. Three major coal types of different ranks (Kiasar, Lavidj and Karmozd) were blended in various proportions to find an optimum condition in flotation circuit in Alborz Markazi coal washing plant. Flotation tests were conducted for prepared blended coal samples to assess floatability of various coal samples. In this paper, mixture design as a statistical method was used to optimize coal blend to increase recovery and grade in Zirab coal washing plant. The statistical analysis showed that the weight percent blending of different coals and interaction between Lavidj and Karmozd regions coal had significant effects on the coal recovery. The optimum condition of 95% recovery and 12% ash content could be reached with 10%, 20%, and 70% blending portion of Kiasar, Lavidj and Karmozd regions coal, respectively.

Mathematical Correlation for Tungsten-Based Alloy Nanopowder to Determine the Relation between Temperature Time and Weight under Certain Temperatures

High temperature treatment of tungsten alloy of W-5wt.% TM （transition metals, TM = Ni, Fe, Cu, Co） nanopowder was run under different temperatures to cover the oxidation rate at different temperatures. The correlation was developed for certain temperatures to find an equation for the relation between time and weight. The thermal treatment was done for different quantities at certain times. The proposed equation studies the correlation between temperature, time, and weight. For each temperature, a number of points were recorded from the measured oxidation curve. The shape of the curves is well-represented in this paper. The final results will present the highest temperature, the maximum weight, and the maximum time for full oxidation at high and low temperatures.

On Q Values and Other Energy Parameters for Superheavy Element Synthesis

Q value and optimal exciting energy of hypothetical superheavy nuclei in cold fusion reaction are calculated with relativistic mean field model and semiemperical shell model mass equation (SSME) and the validity of the two models is tested. To give useful references for the experiments in the superheavy nuclei synthesized in cold fusion reactions,the Q value, fusion barrier and optimal exciting energy for the possible target plus projectile combinations suggested by Gupta et al. are calculated and the most possible target plus projectile combinations are pointed out according to our calculations.

A Novel Hydrolytic Product from Flesh of Mactra veneriformis and Its Bioactivities in Calcium Supplement

To prepare calcium-binding peptides, the flesh residue of Mactra Veneriformis was subjected to enzymatic hydrolysis. By comparing the capability of combining calcium of the hydrolyzates, pepsin was confirmed to be the most suitable enzyme for hydrolyzing the flesh residue to release calcium-binding peptides among the seven tested proteases. The pepsin hydrolyzate (PHM) was divided into three fractions according to the molecule weight of its composition, which ranged from 0.5 to 15 kDa. The low-molecule-weight fraction named PHM-3 had the highest capability in combining calcium. The peptides existing in the PHM-3 fraction consisted of higher contents of Glu, Ala and Leu, and could produce one type of calcium-peptide complex by powerfully chelating calcium ions. PHM-3 products could effectively increase calcium absorption and retention while they decreased the calcium excretion in animal tests. Additionally, symptoms caused by low calcium bioavailability in ovariectomized rats, such as bone mineral density reduction and mechanical strength loss could be significantly ameliorated by the hydrolytic products addition in diet.