试谈计算机软件测试管理的应用

计算机的软件测试是软件工程构成部分之一,同时软件测试也是检验软件开发人员及软件产品是否合格的重要凭据。就软件测试管理系统活动及应用两个方面的内容进行研究,并对管理工具的存在进行简单的介绍。     

新型破乳-助排剂的研制及其在吉林油田的应用

储层压裂改造是低渗透油气藏增产的重要技术,压裂后使地层中的滤液及时返排能够降低油气流动阻力,增加油气井产量,压裂液的压后返排率的高低直接影响压裂增产效果。目前采用添加破乳剂和助排剂的方法提高返排率。为了降低成本、减少伤害,本文通过对压裂液体系中的破乳剂、助排剂进行优化,筛选出新型破乳-助排剂。采用新型破乳-助排剂,达到一剂两效的作用。现场应用情况表明该技术效果良好。本文分析了破乳剂和助排剂的作用机理,以及新型破乳-助排剂的性能。     

High-pressure fluidized bed coating utilizing supercritical carbon dioxide

Various particles with sizes between 100 and 200 μm were encapsulated with waxes commonly used in technical coating applications. For this, a homogeneous mixture of molten paraffin and supercritical carbon dioxide was prepared in an autoclave and injected into the high-pressure fluidized bed through a nozzle from the bottom. Due to the different conditions in the mixing autoclave and the fluidized bed, the paraffin precipitated in the vicinity of the nozzle and adhered to the solid particles. A complete, thin, uniform, and solvent-free coating was produced. The use of two paraffins with different alkane compositions resulted in dissimilar spreads on glass beads due to their different glass transition temperatures. A smaller pressure drop across the nozzle led to more uniform and even coatings. Glass beads, ceramic spheres, potassium chloride, and lactose showed similar coating results, whereas different morphologies were observed with a plastic material, characterized by a rougher surface and a lower surface energy. The high quality of the coating was confirmed by standard dissolution tests with coated potassium chloride crystals and lactose agglomerates.     

一种基于特征迁移系统的软件产品线测试方法

为了在软件产品线的应用工程阶段最大程度地复用领域工程的测试用例,领域测试用例需要覆盖领域模型中的变化性.针对此问题,提出了一种以特征模型为出发点的软件产品线测试方法,通过扩展特征迁移系统建立软件产品线的领域行为模型,对模型中的变化性迁移进行抽象,得到精简的测试模型;应用迁移覆盖准则,导出包含变化性的领域测试用例;在应用工程阶段,根据具体应用所包含的特征,绑定领域测试用例中的变化性,复用领域测试用例导出针对具体应用的测试用例.最后通过一个咖啡机产品线验证了该测试方法,导出了可复用的领域测试用例.     

An analytical tuning approach to multivariable model predictive controllers

Multivariable model predictive control is a widely used advanced process control methodology, where handling delays and constraints are its key features. However, successful implementation of model predictive control requires an appropriate tuning of the controller parameters. This paper proposes an analytical tuning approach to multivariable model predictive controllers. The considered multivariable plants are square and consist of first-order plus dead time transfer functions. Most of the existing model predictive control tuning methods are based on trial and error or numerical approaches. In the case of no active constraints, closed loop transfer function matrices are derived and decoupling conditions are addressed. For control horizon of one, analytical tuning equations and achievable performances are obtained. Finally, simulation results are used to verify the effectiveness of the proposed tuning strategy.     

不同煅烧温度下形成的含氟硫A矿对水泥水化性能的影响

为研究不同煅烧温度下，含氟硫熟料中不同性能、形貌特征的A矿与水泥水化形成钙矾石的关系以及A矿对水泥水化性能的影响，采用工业原料并尽量模拟立窑内煅烧状况，对经1350℃和1425℃温度下煅烧的熟料进行了A矿形貌、A矿水化率及A矿与钙矾石形成关系等系列试验。试验结果表明，在传统的煅烧温度下（1400～l425℃）烧成的熟料．其A矿的固溶程度及A矿含量均比低温（1350℃）烧成的高；掺氟硫复合矿化剂烧制的熟料的A矿具有较高的水化速度，熟料强度较高．其制成的水泥在水化时，液相成分受高固溶程度A矿的水化所控制，所形成的钙矾石较低温煅烧的稳定．且A矿水化产物的形成与钙矾石（AFt）的形成较协调，水泥石机械强度更高。     

生物酶去血渍性能研究

研究了蛋白酶MDB-1、淀粉酶MDF-1、脂肪酶MZF-1、纤维素酶MXW-2在相同的浸泡-洗涤条件下对血污布去污效果的影响,得到了能有效提高血污布去污值的各单一酶量:在温度30℃,质量浴比为1∶100,pH7.0,浸泡30 min的条件下,蛋白酶为2 mg/mL,淀粉酶为8 mg/mL,脂肪酶为2.5 mg/mL,纤维素酶为4 mg/mL。     

Polynomial time approximation algorithms for proportionate open‐shop scheduling

This paper deals with the presentation of polynomial time (approximation) algorithms for a variant of open‐shop scheduling, where the processing times are only machine‐dependent. This variant of scheduling is called proportionate scheduling and its applications are used in many real‐world environments. This paper develops three polynomial time algorithms for the problem. First, we present a polynomial time algorithm that solves the problem optimally if , where n and m denote the numbers of jobs and machines, respectively. If, on the other hand, , we develop a polynomial time approximation algorithm with a worst‐case performance ratio of that improves the bound existing for general open‐shops. Next, in the case of , we take into account the problem under consideration as a master problem and convert it into a simpler secondary approximation problem. Furthermore, we formulate both the master and secondary problems, and compare their complexity sizes. We finally present another polynomial time algorithm that provides optimal solution for a special case of the problem where .     

Velocity measurements and flow field characteristic analyses in a turbo air classifier

Turbo air classifier is one of the most widely used powder classification equipment. The rotor cage as a rotary component can create a forced centrifugal field, so it is a key part for turbo air classifier. In order to investigate the effect of structural variations of the rotor cage on flow field characteristics, three dimensional velocity measurements of the annular region in a turbo air classifier equipped with two different rotor cage bottom plates (A and B type) are performed by laser Doppler velocimeter (LDV). It is found that the different bottom plates have different axial and tangential velocity distributions in the annular region. However, the structural variations of the rotor cage have hardly any effect on the radial velocity. Based on the classification principle, the relation between the classification performance and the flow field characteristics is investigated in great detail.The results of the flow field measurements were tested by the classification experiments carried out with cement raw meal and ground calcium carbonate. The results demonstrate that B type bottom plate can realize the production of narrow particle size distributions, so it is more favorable for classification than A type bottom plate. Classification experiment results are in good agreement with the results of the flow field measurements.     

基于IHSA_LSSVM的供应链绩效评估研究

为有效评估供应链绩效,结合和声搜索算法(IHSA)与最小二乘支持向量机,提出一种评估算法(IHS_LSSVM)。研究和声搜索算法的原理,对基音调整概率和基音调整步长进行动态调整,给出一种改进的和声搜索算法。利用该算法的全局搜索能力优化选取LSSVM的惩罚因子r和高斯核函数的半径σ。采用供应链绩效评估实例,构建供应链评估模型。仿真实验结果表明,与已有的BP神经网络和LSSVM等评估算法相比,IHS_LSSVM具有更小的预测误差和更高的预测精度。