论企业战略联盟

作为现代企业组织制度最重要的创新形式——企业战略联盟，已成为现代企业提升国际竞争力，参入全球竞争的重要方式之一。本主要论述了什么是企业战略联盟、企业为什么要建立战略联盟及企业怎样建立有效的战略联盟。     

浅析共产党员先进性在企业生产经营中的体现

共产党员品质、能力和行为的统一是共产党员保持先进性的实质内涵。为此,在企业生产经营中,共产党员在品质上要自觉遵守企业道德,在能力上要形成自己的核心竞争力,在行为上要做到互尊、互助、互爱。只有这样,才能保证企业处于一个公正的道德环境中,才能具有企业自己的竞争优势,才能保持企业可持续发展。     

基于微分竞争学习的参数估计器

推导了基于微分竞争学习的参数估计器（ＤＣＬＰＥ），为解决没有统计先验信息、线性或非线性观测过程以及待估参数属于多类统计模式的参数估计问题提供了一种有效方法．应用实例仿真验证了ＤＣＬＰＥ的全局搜索寻优与自适应参数估计能力     

Enhanced flocculation of colloidal dispersions by polymer mixtures

Bridging flocculation and electrolyte coagulation of negatively charged colloidal dispersions in the presence and absence, respectively, of uncharged polymers and polymer mixtures were studied. The relative coagulation and flocculation rates of particles in the presence of electrolyte and small polymer amounts were measured and the stability ratios have been calculated at various ionic strengths. Also, the structure of polymer layers formed in individual adsorption of polymers and in simultaneous competitive adsorption from binary polymer mixtures at particle/solution interfaces was investigated. The electrophoretic mobility and the diffusion coefficient of particles with and without adsorbed polymer were measured by laser Doppler-electrophoresis and photon correlation spectroscopy, respectively, and the electrophoretic and the hydrodynamic thickness of adsorbed polymer layers have been calculated. It was found that the adsorbed polymers may enhance or diminish the rate of successsful encounters between particles, even at low surface coverages, depending on the magnitude of the interparticle electrostatic repulsion. In addition, competitive adsorption of chemically different polymers for particle surfaces may result in considerable alteration in the conformation of macromolecules in the mixed adsorption layer. Close correlation was found between the effectiveness of polymers as flocculants and the thickness of adsorbed polymer layers formed at optimum polymer dosages on the particle surfaces. Binary mixtures of suitable polymers proved to be very efficient flocculants for the dispersions. The enhanced flocculating effect of some mixtures can be ascribed to extended polymer layers formed in competitive adsorption of chemically different macromolecules at particle/solution interfaces. These findings have relevance in many environmental technologies and offer a way of improving the effectiveness of solid–liquid separation processes.     

Mixing in a multi-inlet vortex mixer (MIVM) for flash nano-precipitation

Rapid precipitation of both organic and inorganic compounds at high supersaturation requires homogenous mixing to control the particle size distribution. We present the design and characterization of a new multi-inlet vortex mixer (MIVM). The four-stream MIVM allows control of both the supersaturation and the final solvent quality by varying stream velocities. The design also enables the separation of reactive components prior to mixing. Finally, the design enables mixing of streams of unequal volumetric flows, which is not possible with alternate confined impinging jet mixing geometries. We characterize the mixing performance of the MIVM using competitive fast reactions (the so-called “Bourne reactions”). Adequate micromixing is obtained with a suitably defined Reynolds number when Re>1600. The experimental results are compared to computational fluid dynamics (CFD) simulations of the fluid mechanics and parallel reactions in the MIVM. Excellent correspondence is found between the simulation and the experimental results with no adjustable parameters. The CFD simulations provide a powerful tool for the optimization of these complex mixing geometries.     

某低品位铅锌矿选矿工艺研究

这是一篇矿业工程领域的论文。为了探究重金属Pb²⁺和Zn²⁺在高岭石-尿素插层复合体中的吸附机理,采用分子模拟的技术,在268、283、298 K和恒压0.1 MPa的条件下,分别在Pb²⁺、Zn²⁺的单一体系和共存体系中进行模拟计算。结果表明：单独对Pb²⁺、Zn²⁺吸附时,吸附量都随温度的升高而降低,等量吸附热也具有同样的趋势,吸附量和等量吸附热均为Pb²⁺>Zn²⁺,自扩散系数随温度的增加而增加,且Zn²⁺>Pb²⁺;在竞争吸附中,变化规律与单独吸附一致,且Pb²⁺、Zn²⁺的吸附量和等量吸附热均小于单独吸附时的值,自扩散系数均大于单独吸附时的值,说明两者之间存在竞争吸附行为。