Geometry of the minimum zone flatness functional: planar and spatial case

The zone straightness and flatness functional is constructed from the definition of the measure. The geometry of the straightness functional is illustrated in the plane, and in three dimensions, a novel means to visually represent flatness is described using the zone separation body. The zone separation body is a new construction that is uniquely associated with every measurement dataset and can be used to represent the flatness functional visually.     

Durability of Brick Lined Steel Ladles from a Mechanical Point of View

The refractory lining in steel ladles is exposed to chemical and mechanical loads during the heats. Mechanical loads develop from the thermal expansion of the refractories which is confined either by the steel construction or by regions of different temperature within the refractory material. The aim of this work was the investigation of factors influencing the mechanical durability of refractory steel ladle linings and the clarification of failure mechanisms. Especially irreversible strains at the hot face of the working lining caused by compressive stresses induce an opening of joints at the hot face. The irreversible strains reduce the compressive stresses in circumferential direction and increase the probability of tensile failure. A further effect of the irreversible strains is a reduced stability of the working lining. Of special interest in this context is a possible controlled expansion of bricks to counterbalance the irreversible compressive strains.     

建立“长三角”醇醚燃料推广应用示范区的战略思考及建议

随着"长三角"地区经济的高速发展,该区域对能源的需求越来越大,能源资源的对外依存度越来越高。为了促进经济的可持续发展,在沪、浙、苏、皖、赣四省一市推广应用煤基醇醚清洁燃料,建立醇醚燃料推广应用示范区是现实可行的选择。其战略意义在于,可满足四省一市在未来经济发展中对能源需求的日益增长,降低能源对外依存度,改善环境状况,构建四省一市能源安全保障体系。沪、浙、苏、皖、赣四省一市甲醇原料资源充足,2008年甲醇产能达到250×104t/a,实际产量为95×104t,尚有155×104t/a产能处于闲置状态。据不完全统计,2008年江苏、安徽、上海在建和拟建的甲醇项目产能超过400×104t/a。此外,浙江省地处沿海,可利用地域优势进口国际市场的甲醇资源。目前已有一部分醇醚燃料生产企业先行发展,拥有成熟的甲醇燃料技术,具备推广应用的条件。在四省一市甲醇燃料推广应用示范区的建设中,应制定区域性产业政策,支持试点企业先行发展;制定示范区财政税收支持政策;建立示范区内多省、市协调发展机制;建立示范区内统一协调的应用推广系统;规范甲醇燃料市场,完善标准体系。     

双清地区储层异常高孔带分布特征与成因分析

利用储层实测孔隙度、测井孔隙度以及铸体薄片等资料,研究了辽河坳陷双清地区储层异常高孔带的分布特征及成因.研究区储层纵向上发育3个异常高孔带,其形成主要受岩性、岩相和成岩作用的影响与控制.异常高孔带主要分布在扇三角洲和湖底扇的河口坝、水下分流河道、辫状分流沟道和前缘-外扇的砂体中,这些砂体均为结构成熟度和成分成熟度较高的长石砂岩;影响异常高孔带形成的成岩因素主要有大气水淋滤、有机酸溶蚀和粘土矿物脱水作用.双清地区储层异常高孔带的深度下限为3850 m,这也是该区油气勘探的深度下限.     

油烧辊道窑预干燥带干燥过程微观数学模型的研究

本文分析了辊道窑内预干燥带传热及干燥过程的特点，引入Morgan的蒸发面后退模型，建立了陶瓷制品干燥过程中温度场分布及湿含量计算的微观数学模型。     

暂堵酸化工艺技术实验研究及应用

针对文明寨、马寨油田非均质性严重、层间矛盾突出、油井能量低、笼统酸化酸液易进入高渗透层、卡封分层酸化应用范围窄且无法改善层间矛盾的现状，研制应用了暂堵分层酸化工艺、工艺成功率１００％，有效率８５．７％，投入产出达１：１０．２，取得了好的效果。     

民营模具贸易公司和模具厂争夺海外订单的博弈

模具贸易公司和模具厂争夺海外订单。     

Influence of the cyclic plastic zone size on the propagation of the fatigue crack in case of 12NC6 steel

Under cyclic loading, the plasticized zone becomes complicated; it contains in particular a second plasticized zone, resulting from the local compression which occurs at the time of the closing of the crack to each cycle. The two plastic zones, monotonous (r_m) and cyclic (r_c), are proportional to (K_max/R_e)² et (ΔK/R_e)², respectively. The objective of this work is to study the evolution of the fatigue crack grown rate (FCGR) and the influence of the plastic zone size (r_c), which represents the seat of the residual stresses, on this evolution in the case of 12NC6 steel. Generally, the plastic zone size increases with the crack advance. The FCGR can be correlated with the energy absorptive in these plastic zones.     

Investigations on nucleation thermodynamical parameters of NdBa2Cu3O7-δ (Nd123) crystallization by high temperature solution growth

Investigations on nucleation thermodynamical parameters are very essential for the successful growth of good quality single crystals from high temperature solution. A theoretical estimation of the nucleation thermodynamical parameters like interfacial energy between the solid Nd123 and its flux BaO-CuO, metastable zone-width, Gibbs free energy, critical energy barrier for nucleation and critical nucleation radius have been calculated from the knowledge of solubility data and by applying the classical nucleation theory. Results are discussed to understand the growth kinetics of Nd123 crystals. Paper presented at the 5th IUMRS ICA98, October 1998, Bangalore