10000m^3天然气球罐用WEL—TEN610CF钢焊接冷裂纹敏感性

WEL-TEN610CF钢是日本新日铁公司生产的低裂纹敏感性高强钢,结合我国首台国产化10 000 m3天然气球罐用37 mm厚WEL-TEN610CF钢焊接性试验研究,对该钢焊接冷裂纹敏感性进行了综合评定,为其焊接工艺的制订提供了可靠的依据。     

Continuous formation of slurry ice by cooling water–oil emulsion in a tube

Water-silicone oil emulsion with an additive, (C₂H₅O)₃SiC₃H₆NH₂, was examined as a heat storage material. A spiral tube used as a heat exchanger was immersed in a low temperature bath and the emulsion was circulated in the tube to make ice continuously. Ice was separated from the ice–liquid suspension in an outlet tank. The amount of formed ice, the temperatures of the inlet and the outlet of the heat exchanger, and the temperatures in the tube wall were measured and the overall heat transfer coefficient and the heat flux through the tube were calculated. Experiments were carried out, varying the flow rate, the temperature of cooling brine, and the thickness of tube wall. The condition under which slurry ice was formed continuously without adhesion of ice to the cooling wall was clarified. Though decrease in the thermal resistance of the tube increased the rate of ice formation or raised the brine temperature, it narrowed the range of the flow rate and of the brine temperature in which slurry ice was formed continuously.     

In Situ Formation of a Novel Nanocomposite Structure Based on MCM-41 and Polyethylene

M41S materials are prepared by in situ assembly of inorganic precursors and organic template and can be viewed as nanocomposites of the siliceous phase and organic surfactant. Calcination of these precursors gives the M41S materials that have been used to prepare novel nanocomposite structures, in which the organic phase inside the nano-sized pores is isolated by the nano-sized inorganic pore walls. The nanocomposite structures can be formed by in situ polymerization of monomers inside the channels. Polymerization of ethylene takes place inside the nano-sized pores, producing the desired nanocomposite structure. The resulting polyethylene was found to be a mixture of crystalline and amorphous phases.     

A new Thermo-viscoplastic Material Model for Finite-Element-Analysis of the Chip Formation Process

A new material model for describing the thermo-viscoplastic flow behavior of workpiece material in metal cutting is presented. In order to express the complex flow behavior which depends on the local strain, strain rate and temperature, a new methodology for sequential formulation is proposed. The material parameters which are achieved by using the flow stress data available at low strain rates are enhanced by matching the results of the experimental investigations and finite element simulations of the orthogonal cutting process. As a result, a material model which has a wide validity range of strain, strain rate and temperature is established.     

环锤破碎机筛条的改进

分析环锤式破碎机筛条结构和选材方面存在问题 ,提出并实践了解决问题的办法 ,使改进后的破碎机取得良好的使用效果     

Metallurgical failure analysis of cold cracking in a structural steel weldment: Revisiting a classic failure mechanism

Cold cracking of structural steel weldments is a well-characterized, well-documented, and well-understood failure mechanism. Extensive effort has been put forth to recognize the welding and materials selection parameters that are conducive to cold cracking; however, these engineering efforts have not fully eliminated the occurrence of such failures. This article describes cold cracking failure specifically related to the construction industry. This particular failure was successfully identified prior to final erection of the structural member, and the weld was successfully reworked. These actions potentially prevented a serious catastrophic event that could have occurred have occurred either later in the construction process or possibly during the use of the building. Individual welding parameters, such as electrode/wire selection, joint design, and pre/postheating, played a role in the failure, and a number of human factors relating to the actual fabrication practices also contributed to the failure process.     

活性炭中甲烷水合物的生成动力学

在温度275．75－279．95K和压力5．6－9．6MPa的静置条件下，测定了14组甲烷水合物在活性炭中的生成动力学数据（压力－时间关系），分析了甲烷水合物在活性炭中生成的物理过程，结合边界层理论和结晶学原理，提出了单液膜传质控制机理的生成动力学模型，并求得了解析解,使用Levenberg-Marquardt方法拟合模型参数，模型预测值与实验值符合良好。     

垦东地区上第三系馆陶组上段成藏规律研究

通过对山东垦东地区构造特征，地层特征和储层特征的研究，从油气运聚，储盖组合，油藏类型及分布和油气控制因素等方面对馆陶组上段成藏规律进行了综合分析，研究表明，研究区的储层主要为曲流河沉积砂体，原油来源于周边的4个生油凹陷，通过不整合曲，储集层以及断层运移到垦东地区后聚集成藏。     

长脉冲激光沉积原位生成YBaCuO超导膜

用长脉冲激光(脉冲宽度150μs,波长1.06μm)辐照高温烧结的YBa_2Cu_3O_(7-x)靶,在6Pa的氧气压强下,巳在(100)YSZ单晶衬底上原位生成YBa_2Cu_(?)O_(7-x)超导膜。衬底置于750℃的加热器上,衬底与靶之间的距离5cm,用该法制得的薄膜光亮坚实,正常态呈金属性,零电阻温度为84.7K。用XRD和SEM对薄膜进行了分析研究。     

G104-5P42分支水平井钻井液工艺技术

G104-5P42井是在高尚堡G104-5区块构造较高部位部署的一口重点开发井，也是冀东油田第一口鱼骨型水平分支井，钻探目的是开发高浅北区Ng12油层，挖掘高浅北区井间剩余油潜力。该井主井眼斜深为2388m，水平位移为736．42m，水平段长243m，第一分支斜深为2342m，水平段长120．25m，水平位移为682．14m，第二分支斜深为2421m，水平段长117m，水平位移为761．73m。三开选用无固相甲酸盐聚合醇钻井液，在钻进油气层前加入GN-YBJ-I保护剂。应用结果表明，无固相甲酸盐聚合醇钻井液具有好的防塌能力和润滑减阻效果，性能稳定、黏度、切力较低，有利于减少环空压力损耗；在油气层段密度控制在1．08g／cm^3以内，为近年来同区块密度使用最低井，减小了有害固相及滤液对储层的伤害密度，经测试该井获高产油流；该井全井平均机械钻速为15．09m／h，钻井周期比原设计提前15d。该体系的配制及维护成本较高，适宜在目的层井段使用，但可回收再利用。