The application of natural sedimentation for the dispersion of polyacrylamide microspheres

The research objectives of this article consist of development of appropriate apparatus and process to apply natural sedimentation for preparing polyacrylamide microspheres industrially. The kettle height of the apparatus should be more than 2 m to provide adequate sedimentation distance for microspheres, and the inner wall of kettle was made of non-polar materials to prevent microspheres from adhering to the wall. The natural sedimentation was used to replace dispersant to maintain the dispersion. Affordable, non-toxic, and non-pollutant corn oil was used as the dispersion medium. Furthermore, single factor synthesis and multi-factor analysis of variance were used to optimize the process.     

Thermal Behaviour of Silica Waste from a Geothermal Power Station and Derived Silica Ceramics

The silica waste originating from a geothermal power plant in Mexico was investigated with the aim of finding its applicability as a raw secondary material for ceramics production. The thermal behaviour of the original silica waste (containing NaCl and KCl from marine brine) and of the purified silica was characterized by means of DTA/TG, emanation thermal analysis (ETA) and thermodilatometry (TD). The reactivity of the purified silica waste mixed with CaCO₃ (1.8 mass%) was characterized by means of ETA, DTA and TG. The microstructures and phase compositions of the final products prepared by heating in air were tested by means of X-ray diffraction and of scanning electron microscopy coupled with electron probe X-ray microanalysis. The thermal analysis methods allowed determination of the optimal conditions for thermal treatment of the silica waste in order to obtain partly sintered porous materials for use as refractory bricks. This revised version was published online in August 2006 with corrections to the Cover Date.     

Mixing dynamics of a vapor-condensate cloud with the ambient air

The mixing of a wet vapor with a gas is studied using analytical and numerical models. The one-dimensional problem of diffusion mixing accompanied by phase transitions is solved in a self-similar formulation. The versions of mixing of the vapor with a cold and warm gas and with a superheated vapor are analyzed. The atmospheric diffusion of immediate emissions containing water vapor and condensate is modeled numerically in a three-dimensional formulation. A study is made of the evolution of hydrodynamic, concentration, and temperature fields as a function of the initial emission parameters (temperature and humidity) and ambient air parameters. __________ Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 49, No. 3, pp. 114–127, May–June, 2008.     

城市文化创意产业的空间组织研究——以宁波市为实证

检视宁波市域文化创意产业空间组织,以期优化宁波文化创意产业布局与发展方式.以第一、二次经济普查数据为数据源,采用空间自相关方法分析宁波市文化创意产业的企业分布,研究发现:(1)宁波市文化创意产业空间集聚水平较低,市域文化创意企业Moran’s I较小,集聚地未跳出经济商务中心;(2)宁波市文化创意产业总体初现集聚态势,但局部集聚不显著;(3)宁波市推行的文化创意产业园政策成效一般,相较其他服务业,文化创意产业空间组织初现显著集聚趋势,且集聚区位偏爱商务中心或创意源发生地的独特性.     

集群企业间关系强度对合作技术创新的影响——基于企业类型和创新类型的视角

集群企业之间的关系强度对合作技术创新具有何种影响,一直存在争论。为了进一步分析该问题,文章借鉴相关研究成果,将集群企业分为核心企业和配套企业,将技术创新分为探索式创新和利用式创新,在此基础上建立了合作创新的博弈论模型。文章研究得出:核心企业之间的弱关系有利于探索式创新,核心企业与配套企业之间的强关系有利于利用式创新;探索式创新和利用式创新是相互促进、相互补充的。     

基于相关性原理起重机负载电机监测系统设计

对起重机负载电机进行了研究,采用西门子公司的S7-200 SMART PLC采集负载电机的机械振动信号,通过工业Wi-Fi无线模块以无线数据包的形式将采集的数据汇总到上位机LabVIEW监测平台。上位机的LabVIEW监测平台对电动机振动信号进行相关性和频谱分析,将实时振动数据频谱信号和已知常见负载电机的轴承外圈故障、轴承内环故障和滚子故障三种典型的故障状态频谱信号进行相关性运算,得到实时信号与已知状态的相关系数;提出了以相关系数作为故障诊断判定阈值的方法进行故障诊断,实现了对起重机状态进行监测以及监控信息发布。     

高职工业分析与检验专业课程体系的改革与实践

在充分调研的基础上,确定工业分析与检验专业职业岗位群,并进行了化验员职业的顶层设计,探索了校企合作的“工学交替、能力递增”的人才培养模式,构建了基于化验员工作过程的工业分析与检验专业课程体系和四进阶的实践教学体系,进行了工作过程的学习领域开发及项目课程开发与实施。实践表明,该课程体系的改革与实践提升了学生的职业技能和教师的执教能力。     

评价指标体系的设计方法研究——基于产业集群竞争力

产业集群竞争力评价是一个复杂的多属性决策问题,论文探讨了整个评价环节中的指标遴选问题。通过对相关评价指标的综合,借助于Delphi问卷获取了指标筛选的基础数据,并借助模糊隶属度、差异性分析、相关性分析、信度与效度检验、稳定性与贴近度等技术指标得到了较为合理的评价指标体系。这一方法的提出,为评价系统中指标体系的遴选提供了一种新的思路和方法。     

Laser computed tomography of opaque industrial products measured by coherent detection imaging method

The coherent detection imaging method with a low-power He–Ne laser as the source is used to obtain transillumination laser computed tomographic and two-dimensional (2D) images of opaque industrial products such as fluorescent lamps and electric light bulbs. This method is principally based on the optical heterodyne detection technique that has the highest sensitivity along with excellent selectivity in terms of coherence, polarization and high directionality. Structures of the filament and electrode enclosed in the opaque glass were clearly identified with submillimeter resolution.     

钛基氧化铱电极电沉积制备技术研究进展

钛基氧化铱电极作为DSA(dimension stable anode)中的典型电极,广泛应用于各个领域.目前工业生产的钛基氧化铱电极主要由传统热分解法制备,存在成本高昂,工艺繁琐,依赖人工劳动,无法大规模生产等问题,十分有必要探索开发新的制备技术.本文从沉积液配方、基底材料的选择及处理、电沉积方式以及沉积时间等方面系...