石油取芯钻头石墨模具在热压过程中的受力状况分析

石墨模具以其优良的性能被广泛应用于热压孕镶金刚石钻头的制造。本文设计了两种规格相同（直径均为216mm），但端部形状不同的石油取芯钻头的石墨模具，并利用有限元分析软件ANSYS对它们在热压过程中的受力状况进行了分析。分析结果表明：在18MPa压力下，圆弧形钻头的模具在胎体与模具接合处出现了应力集中，超过模具的极限抗拉强度，导致模具破裂。因此，在设计钻头的石墨模具时，应考虑到钻头的端部形状，参考有限元分析结果再对模具进行设计，有助于优化设计，降低试验和生产成本。     

多系统信息整合办公系统解决方案

在设计新的办公系统的时候,大多数企业都会遇到与部分已长时间运行的定制应用系统整合的问题,如何整合多个系统的基础上设计新的办公系统,实现各系统间信息互通和共享,是本文分析的主要内容。     

影响SBS改性沥青针入度的因素探讨

改性沥青制备过程复杂,针入度的影响因素较多,试验主要介绍了基质沥青、改性剂的种类、改性剂加入量、剪切时间、测试基准面等因素对改性沥青针入度的影响。     

滤板施工技术比较

滤板是水处理滤池工艺的重要组成单元，文章对预制滤板和整体现场浇筑滤板的施工技术进行了比较说明，并得出了滤板施工技术选型结论。     

Bubble Motion near a Wall Under Microgravity: Existence of Attractive and Repulsive Forces

A numerical simulation for a bubble motion near a wall under microgravity, relevant to material processing such as crystal growth in space, is presented based on a mass conservation level set algorithm to predict the bubble behavior affected by the near wall. The simulation for the wall effect on the bubble driven by an external acceleration parallel with the near wall referred to as g-jitter confirms for the first time the existence of the wall attractive force to the bubble near the wall under certain conditions such as the initial distance between the bubble and the wall, density and viscosity ratios between the bubble and surrounding liquid under microgravity. The wall effect mechanism is explained, and the results show that the wall attractive force increases with the increasing of density ratio. Moreover, the simulation for the wall repulsive effect on the bubble near the wall under microgravity has been carried out as well.     

超临界流体的应用及进展

介绍了超临界流体的性质及超临界反应、超临界二氧化碳萃取在医药、食品、化工、环保等方面的应用及进展。     

Tribological and economic evaluation of recycled mineral lubricating oils

Seven kinds of used mineral lubricating oils, including hydraulic oils, film bearing oils, steam turbine oil and gear oils, were recycled by reclamation and adding additives. Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers. Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope. The recycling costs of burning, re-refined and refortified were estimated. Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard. With the different friction materials under different loads, refortified oils provided excellent lubrication performances, much better than those of fresh oils. Because of additives replenished, the different lubrication films could form on the worn surfaces. A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods.     

Modeling the effects of yarn material properties and friction on the ballistic impact of a plain-weave fabric

Impact of a rigid sphere onto a high-strength plain-weave Kevlar KM2^® fabric was modeled using LS–DYNA^® focusing on the influence of friction and material properties on ballistic performance. Quasi-static friction was experimentally determined and incorporated into the model. Two clamped edges and two free edges were used as boundary conditions to correlate the model to an experimental test providing yarn–yarn movement. Yarns were modeled as continua with modulus and strength dominating along the length. Parametric studies incorporating different yarn material properties and initial projectile velocities were then performed with the above set of boundary conditions. Results indicate that ballistic performance depends upon friction, elastic modulus and strength of the yarns. While friction improves ballistic performance by maintaining the integrity of the weave pattern, material properties of the yarns have a significant influence on the effect of friction. It is shown that fabrics comprised of yarns characterized by higher stiffness and strength relative to the baseline Kevlar KM2^®, exhibited a stronger influence on ballistic performance. Therefore all three parameters viz., friction, elastic modulus and strength along with other variables (fabric architecture, boundary conditions, and projectile parameters) are needed to examine ballistic performance of high-strength fabric structures.     

氨浸 - 碳化法制活性氧化锌

对以菱锌矿为原料，用硫化碱为除杂剂，二氧化碳为沉锌剂的活性氧化锌制备方法进行了研究，重点考察了除杂和碳化沉锌过程的工艺条件，实验得出，除杂时硫化碱加入量为理论量的120％较好；碳化沉锌终点定在pH值为8时较为适宜；碳化时采用较低的温度，较高的二氧化碳浓度和较高的空塔气速（0．04－0．05m/s)为宜。     

提高洗煤厂对标管理的探讨

从对标管理实施的前提条件、步骤和注意的几个问题等方面对对标管理进行了简要的说明.