黄河泥沙分离的水力旋流器数学模型建立与分析

阐述关于采用以水力旋流器作为分离平台，黄河泥沙分离时液流数学模型的建立和泥沙颗粒的运动动力特性的分析，细微泥沙颗粒在水力旋流器里对液流影响可忽略，迎过分析进入旋流器液流具体分析液流等式和建立RNG数值模型等式。了解颗粒运动轨迹和涡旋效应对液流颗粒运动的影响，以及颗粒分离的效率影响因素，继而，对采用水力旋流器对黄河泥沙进行分离的数学模型的建立提出研究方向。     

圆度、直线度误差分离方法之比较

分析了圆度误差分离技术和直线度误差分离技术的异同点，通过实验算例，进一步验证了精确的频域三点法直线误差分离技术的理论正确性。     

激光分离细胞新系统

美国麻省理工学院利用造价低廉的激光开发出一种从样品中分离某些细胞的新系统。该系统能在普通的玻璃载玻片上分离比1万多种细胞，这将有助于研究人员轻松完成许多在以前看来不可能的生物实验。而且，与其他细胞分离方法相比，该系统分离速度快、操作简单且价格便宜。     

基于最小互信息原理的机械振动源分离研究

盲源分离技术是近年来出现的一种先进的信号处理方法。该文推导了基于最小互信息原理的自然梯度法，用于机械振动信号源的分离。实验证明，该方法是分离机械振动信号源的一种有效方法。     

大型立式抗磨蚀单级离心泵的设计浅析

介绍一种大型立式抗磨蚀单级离心泵设计的经验浅析,该泵用于引黄灌溉项目,输送含有大量泥沙颗粒的黄河水。对泵的使用可靠性要求高,基于固液流体的设计理论,从泵设计、材料选择、流道表面处理等方面介绍泵的优化设计。     

基于分离速度的七自由度仿人手臂自运动研究

首先分析了一种七自由度冗余仿人手臂的运动学正问题，然后求解了其雅克比矩阵，最后基于分离速度控制法，利用求得的雅克比矩阵对其进行自运动分析实验。实验结果表明，分离速度法求运动学逆问题，本质上是一种速度积分方法，存在数值计算误差。     

基于 Fluent软件的旋风分离清选系统仿真研究

以小区小麦联合收获机的旋风分离清选系统为研究对象,运用Gambit软件对其核心部件－旋风分离筒前处理,运用Fluent软件对其内部流场进行了数值模拟。采用DPM模型模拟了小麦颗粒、茎秆和颖壳在分离筒中的运动情况,以颖壳分离效率、茎秆分离效率和小麦籽粒损失率为评价指标,对三种模型进行了对比分析,获得最优模型并进行了实验验证。     

一种柴油滤油水分离效率实验系统的设计

介绍了一种柴油滤油水分离效率实验系统,该实验系统按标准ISO 16332—2018和SAE J1488—2010设计,采用节流孔板式水乳化装置或不锈钢离心泵的高速剪切乳化方式,集成马尔文激光粒径仪检测水滴大小,可以自动取样,并经卡尔费休滴定仪自动进样分析、自动计算油水分离效率的结果。客户使用该实验系统一段时间后反馈效果良好,可满足国内科研院所、第三方检测机构和生产厂家等的实验需求。     

三点法误差分离技术仿真研究

主轴旋转时轴心轨迹能够形象、直观地显示设备的运行情况。在主轴轴心轨迹测试研究时,误差分离技术主要有反向法、多点法和多步法,根据多点法中常用的三点法误差分离技术的表达式,具体研究三点法误差分离技术中传感器安装角度对分离精度的影响情况,并通过仿真实验,研究三点法误差分离技术的传感器安装角度的问题,确定了三个传感器的安装角度,并验证了其准确性。     

用于壳寡糖提取的多元分流式集成反应分离装备研究

针对生化反应降解壳聚糖工艺，采用色谱分离技术来获得不同聚合度的壳寡糖。提出了一种新的反应分离集成工艺，结合计算机控制技术，开发成功多元分流式集成反应分离的机电一体化装备。通过实验发现，该装备能有效地提取壳寡糖，并具有较高的自动化程度和生产效率。     

Triboelectrostatic separation system for separation of PVC and PS materials using fluidized bed tribocharger

A triboelectrostatic separation system using a fluidized bed tribocharger for the removal of PVC material in the mixture of PVC/PS plastics is designed and evaluated as a function of electric field strength, air flow rate, and the mixing ratio of two- component mixed plastics. It consists of a fluidized-bed tribocharger, a separation chamber, a collection chamber and a controller. PVC and PS particles can be imparted negative and positive surface charges, respectively, due to the difference in the work function values of plastics suspended in the fluidized-bed tribocharger, and can be separated by passing them through an external electric field. Experimental results show that separation efficiency is strongly dependent on the electric field strength and particle mixing ratio. In the optimum conditions of 150 lpm air flow rate and 2.6 kV/cm electric field strength a highly concentrated PVC (99.1%) can be recovered with a yield of more than 99.2% from the mixture of PVC and PS materials for a single stage of processing.     

光敏电阻的自动测试与分选

介绍光敏电阻的自动测试与分选系统的结构及工作流程,本系统具有机构简单、效率高、造价低、使用方便等特点,取得了一定的经济效益.     

A comparison of reversal and multiprobe error separation

This paper demonstrates the application of two methods of separating spindle error motion from artifact roundness on a spindle with <5 nm radial error. Two error separation methods, reversal and multiprobe, were each applied to data taken on two different test stands allowing direct comparison of the four combinations of hardware and separation algorithm. Because the theory of both separation methods is well documented, this work focuses on their implementation for nanometer-level measurements. As will be seen, a number of issues must be addressed to obtain repeatable results at this level of precision in spindle metrology. Ultimately, the results show that sub-nanometer features in both spindle error and artifact form can be reliably and repeatably resolved by both techniques.     

Phase behaviour and separation kinetics of polymer blends

The liquid–liquid phase separation kinetics and phase behaviour of hydrogenated polyethylene and deuterated polypropylene blends have been systematically studied by optical microscope. Phase diagram was constructed from the phase transition temperature. The hydrogenated polyethylene/deuterated polypropylene blend exhibits upper critical solution temperature in the melt. The time evolution of the characteristics morphology for liquid–liquid phase separation is determined for the hydrogenated polyethylene/deuterated polypropylene blend at various compositions and following a quench from initial homogenous melts at higher temperature to various lower temperatures. Liquid–liquid phase separation kinetics follows nucleation and growth mechanism. The experimental results from optical microscope measurement at various conditions are all consistent with the nucleation and growth mechanism.     

The concentration and separation of bacteria and cells by ferrography

When micro-organisms are found in nature they are frequently accompanied by other matter including organic and inorganic particles. Also, the organisms are extremely dilute so that to examine them it is necessary to grow them or to concentrate them by some means. The disadvantage of growing them is that a suitable nutrient must be known and time is needed. With the introduction of ferrography it has become possible to separate micro-organisms from other participate material by chemically magnetizing the organisms and recovering them with the Ferrograph. The chemistry of organism magnetization is discussed and examples given. The recovery of five species of bacteria is described. The separations of eukaryotic from prokaryotic cells as well as the separation of white from red blood cells are also demonstrated.     

Blind separation of vibration components: Principles and demonstrations

Blind source separation is the issue of recovering the various independent sources exciting a system given only the measurements of the outputs of that system. It has recently become the focus of intensive research work due to its high potential in many applications. However when it comes to vibration signals, blind source separation faces a number of difficulties which seriously hinder its feasibility. In this paper we first draw a list of these difficulties. We then propose to somehow lessen the ambitions of BSS to more realistic goals, and in particular to separate vibration signal into contributions of (1) periodic, (2) random stationary, and (3) random nonstationary sources. Although not ideal, such a separation can provide substantial information in many practical cases of interest. Towards this aim we propose two robust separation techniques based on the short-time Fourier transform. They are perfectly suited to handle convolutive mixtures of sources and they lead to fast and efficient implementation.     

Creep and separation of oil films in reciprocating motion

As a fundamental investigation of gas/liquid two-phase lubrication under reciprocating conditions, the behaviour of oil films between a reciprocating plate and a stationary optical flat was observed. It was found that under reciprocating conditions the dynamic behaviour of oil films with free boundaries was influenced by complicated interfacial phenomena, showing creep, notching and separation of their contours. Analysis of the results clarified the influencing factors and the inherent conditions in the characteristics types of film contours     

Bone marrow cells of swine: collection and separation

Bone marrow is a source of stem cells for greater and easier access, which is widely studied as a provider of hematopoietic and mesenchymal cells for various purposes, mainly therapeutic by the advances in research involving cell therapy. The swine is an animal species commonly used in the pursuit of development of experimental models. Thus, this study aimed to standardize protocol for collection and separation of bone marrow in swines, since this species is widely used as experimental models for various diseases. Twelve animals were used, which underwent bone marrow puncture with access from the iliac crest and cell separation by density gradient followed by a viability test with an average of 98% of viable cells. Given our results, we can ensure the swine as an excellent model for obtaining and isolation of mononuclear cells from bone marrow, stimulating several studies addressing the field of cell therapy.     

交通路标图像的分割与识别方法研究

对交通道路标志进行实时、正确的识别,是车辆自动导航中的一个重要方面.提出一种基于尺度不变特征变换(SIFT)算法的交通路标识别方法.该方法首先根据交通路标的色彩信息,利用HSV颜色空间对输入含有路标的彩色图像直接进行处理,从而快速分割提取目标区域;然后基于SIFT特征将分割提取的目标图像与数据库中原有图像进行特征匹配,...