组合补偿头手棒质量方法在滤棒成型机上的应用

滤棒成型机在启动过程中存在头手棒滤棒重量偏轻,吸阻波动较大,达到稳定值需要时间较长,调整困难等问题,为此,设计了组合补偿头手棒质量方法应用于ZL26滤棒成型机,通过在启动阶段对供丝辊和甘油泵进行补偿,进而对滤棒吸阻和重量进行补偿。该方法使用后吸阻偏差由12Pa降低为≤8Pa,重量偏差由0.025g减少为0.014g,机组启动后吸阻达到稳定值所需时间由1.6min减少为<1min。     

无反射造波数值波浪水槽

本文应用ＶＯＦ方法建立了二维数值波浪水槽模型。基于线性造波机理论在水槽左端设置了可吸收式造波机数值边界条件。即造波板的运动除了产生行进波外，同时还产生一个抵消反射波的局部波动。水槽右端除了通常的可滑移与无滑移直墙边界条件外，依据线性辐射条件建立了开边界条件。通过水槽右端为直墙时的全反射情形，比较了可吸收造波机与普通造波机的速度变化与波面变化。文中在Ｈ０／ｄ＝０．１￣０．３，ｄ／Ｌ＝０．１２４￣０．     

Solute–Solvent and Solute–Solute Interactions of Resorcinol in Mixed 1,4-Dioxane–Water Systems at Different Temperatures

The densities, viscosities, and ultrasonic speeds of resorcinol in 1,4-dioxane + water mixtures and in pure 1,4-dioxane have been measured at 303.15, 313.15, and 323.15 K. Apparent molar volumes (V_ϕ) and viscosity B-coefficients are obtained from these data supplemented with densities and viscosities, respectively. The limiting apparent molar volumes ( ) and experimental slopes ( ) derived from the Masson equation have been interpreted in terms of solute–solvent and solute–solute interactions, respectively. The viscosity data have been analyzed using the Jones–Dole equation, and the derived parameters B and A have also been interpreted in terms of solute–solvent and solute–solute interactions, respectively. The structure making/breaking capacities of resorcinol in the studied solvent systems have been discussed. The compressibilities obtained from the data supplemented with their ultrasonic speeds indicate the electrostriction of the solvent molecules around the ions     

矿井测量中觇标及仪器的对中误差对测角的影响

通过分析觇标及仪器对中误差对测角的影响,最终确定这种误差是主要误差.觇标对中误差与对中线量误差成正比,与所测角度的两边成反比,与角度本身的大小无关;仪器对中误差与其线量对中误差成正比,与所测角的两边长度成反比,与所测角的大小有关.针对这种误差的属性,采取有效措施,减小其对测角的影响.     

AT89C51在全自动首饰织链机中的应用

介绍了以AT89C51为核心的全自动首饰织链机系统,具有线材输入、掉链检测、吹链检测、挂链驱动、停机和手动控制功能,整机体积小,工作可靠,自动控制程度高,织链速度最高可达300个圈/min。     

Chemometric representation of molecular marker data of some Niger Delta crude oils

Chemometric representation of data is the most preferred and adopted method of research reporting in contemporary times. Data are easily discerned and interpreted. Molecular maker parameters of some crude oils from the Nigerian’s Delta region are chemometrically expressed after data treatment using multivariate statistical analyses, other graphical representations were the star diagram and triangular (ternary) plot. The results indicated discrimination of samples into two genetic families corresponding to their primary oil fields. These groupings were more obvious for results obtained via principal component analysis. Genetic groupings are principally due to compositional differences which are commonly attributed to unique source rock depositional environments and/or sourcing organic matter. The two families of oils identified have both terrestrial inputs, but differ comparatively by relative marine inputs.     

KDF型滤棒成型机组集中风力供给与除尘装置的设计与应用

介绍了KDF型滤棒成型机组风力系统的工作原理,分析了常规除尘系统存在的问题与不足,对此进行技术改造:①拆除设备自带的负压风机;②建立集中风力供给与除尘装置;③针对醋酸滤棒的特性,采用二级除尘方式。系统改造后运行稳定,装机容量减少、维修简单,节能降噪明显,产生良好的经济效益和社会效益,值得推广应用。     

基于引力搜索算法的含分布式电源配电网重构

分布式电源接入配电网将直接改变潮流分布,而网络重构通过改变开关的开合状态以提高供电的可靠性和经济性。以降低网损和缺供电量为目标,以可调度DG的有功输出和开关状态为优化变量,建立多目标协调优化的配电网络重构的数学模型。将引力搜索算法、Pareto最优解理论和模糊决策理论相结合,提出了求解上述模型的多目标混合优化方法,以实现配电网结构和DG出力的协同优化。通过对IEEE33节点测试系统的仿真结果,表明所提出方法能够实现DG出力和网络重构的综合优化和多目标优化,并且在全局寻优能力和收敛速度上表现出色。     

豆浆机信息化指数和智商评测浅析

本文通过介绍豆浆机信息化指数和智商评测的必要性及其规范的要求,以及通过实例产品评测结果的对比,使读者对《豆浆机信息化指数和产品智商评测规范》有一个初步了解。