原料场受卸技术及其应用

介绍了原料场受卸工艺的类型及其结构特点、技术特性、适用场合,从技术能力、技术特点、技术经济三个方面分析并比较了原料场受卸工艺,提出了原料场受卸工艺的设计流程和选型建议.     

Significance of the small crack growth law and its practical application

The effects of microstructure and specimen size on the fatigue crack growth rate of an annealed 0.42 C steel were investigated under uniaxial fatigue loading in air. Although a dramatic fluctuation of crack growth rate was found in the propagation process of microstructurally small cracks, the mean value of crack growth rate can be evaluated by a simple mechanical parameter, σ _a ⁿ l (l, crack length; n, constant), under high stress levels where small-scale yielding conditions are exceeded. This parameter is also effective for cracks larger than 1 to 2 mm under high stress levels, as long as the finite boundary effect of a specimen on the driving force of crack propagation is considered. The crack growth rate of the alloy was described as a function of stress amplitude and crack length in terms of two mechanical parameters, σ _a ⁿ l and ΔK. The applicable conditions of the two parameters were discussed and manifested.     

A general numerical method to solve for dislocation configurations

The shape of a mechanically equilibrated dislocation line is of considerable interest in the study of plastic deformation of metals and alloys. A general numerical method for finding such configurations in arbitrary stress fields has been developed. Analogous to the finite-element method (FEM), a general dislocation line is approximated by a series of straight segments (elements) bounded by nodes. The equilibrium configuration is found by minimizing the system energy with respect to nodal positions using a Newton-Raphson procedure. This approach, termed the finite-segment method (FSM), confers several advantages relative to segment-based, explicit formulations. The utility, generality, and robustness of the FSM is demonstrated by analyzing the Orowan bypass mechanism and a model of dislocation generation and equilibration at misfitting particles. Energy differences from previous analytical methods based on simple loop shapes are significant, up to 80 pct. Explicit expressions for the coordinate transformations, energies, and forces required for numerical implementation are presented.     

Analyzing numerical responses: A model and its application to examples from personnel and organizational management.

We analyze the structure of the numerical responses of persons connected with money and present a mental model together with its connection to fuzzy theory. The numerical response is one single number containing information about the value and the exactness of a variable. We test the rules describing the process, generating these responses experimentally as well as using examples from a questionnaire, and provide further empirical evidence. The simultaneous determination of the value and exactness of a response resulting in one number causes severe problems in using these responses as input to decision models. We propose a pre-analysis of the data with the rules provided in this paper. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

通用菜单生成与激活的设计思想及应用

介绍通用菜单自动生成与激活程序的设计思想，并通过实例介绍了软件的使用方法。采用该软件开发应用系统不仅速度快而且系统结构透明，维护方便。’     

A novel self-activated ultraviolet persistent luminescence material and its anti-counterfeiting application based on intensity and time resolution from persistent luminescence

Recently,the ultraviolet(UV) persistent luminescence material(PLM) has attracted extensive attention.However,the design and development of new UV PLM and exploring their promising advanced application remain challenges.Here,we developed a new dopant-free self-activated UVA PLM,Zn₂ Al₂ SiO₇,which could be applied in anti-counterfeiting field.Zn₂ Al₂ SiO₇ shows UVA persistent luminescence(PersL) peaking at 380 nm after 254 nm UV lam...     

A numerical model for the cyclic working life of a structurally inhomogeneous powder material

A numerical model is proposed for the cyclic life of a structurally inhomogeneous powder material. The model is based on the mechanics of structurally inhomogeneous deformable media. The finite-element method has been used to solve the boundary-value problem for deformation and failure in a microscopically inhomogeneous material under a external load. The simulation indicates the effects of structural microscopic inhomogeneities (pores and solid inclusions) on the fatigue characteristics of PK-100N4M powder low-alloy steel, and the fatigue working-life curve is derived.Perm State Technical University. Translated from Poroshkovaya Metallurgiya, No. 5–6, pp. 112–118, May–June, 1994.     

充填胶凝材料的发展与应用

胶结材料是充填采矿技术中最为重要的因素,胶结材料的变化有时会引起采矿方法的变革;胶结剂作为胶结充填材料的主要材料之一,在矿山充填采矿工艺中占有重要地位.文中对主要的几种矿山充填胶凝材料(如高水固结材料、赤泥胶结材料、矿渣胶结材料、全砂土固结材料、矿山尾砂固结材料等)进行了详细阐述.胶凝材料将向缩短凝固时间、低成本、高强度、易输送、易生产、工艺简单等方向发展,胶凝材料具有广阔的研究、发展和应用前景.     

Development and application of carbon-alloy material for steelmaking

开发了新型碳锰合金增碳剂,解决了转炉出钢使用无烟煤增碳剂增碳熔化时间长、碳的收得率不稳定的问题,并通过工业试验对其冶金效果进行了考察。试验结果表明,新型碳锰合金增碳剂熔化速度快,碳、锰收得率高,碳的平均收得率为92．95％,锰的平均收得率为93．31％。采用新型增碳剂能保证钢水质量,降低出钢温度,缩短物流时间和降低炼钢成本。     

韶钢焦化区域工艺总图布置的研究与应用

介绍韶钢在6 m焦炉项目中采用创新型工艺总图布置,用地指标大幅度降低,整个焦化区域(180万t焦化厂)用地指标只有国家标准的48%,并且6 m焦炉项目(年产110万t焦炭)用地指标只有国家标准的36%,节约了大量土地资源,具有很强的推广价值.     

数值仿真技术在粉末冶金零件制造中的应用及研究进展

数值仿真技术可用于粉末零件制造的工艺设计与优化,为缺陷预测与预防、零部件性能改善提供有效的理论支持和技术指导。基于粉末零件压制和烧结机理的本构模型是进行准确可靠的数值计算的必要条件。本文主要介绍了粉末压制模拟中常用的本构建模方法,如粉末烧结体塑性力学方法、广义塑性力学方法及微观力学方法,和粉末烧结模拟中的微观结构模拟方法,如分子动力学法、相场法、蒙地卡罗法及元胞自动机法等,并对以上各种建模方法的计算原理、适用范围及近些年的应用进展做了简要介绍,最后对数值仿真技术在粉末零件制造中的发展方向进行了展望。     

转炉镁碳质喷补料的研制与应用

为了提高转炉炉龄,降低炼钢成本,开发了新型MgO-C质半干法喷补料.以碱性喷补料的损毁机理为根据,讨论了影响喷补料的主要因素:原料成分、颗粒分布、碳源及结合剂的选择等.通过一系列的试验比较和选择,研制出的镁碳质喷补料具有流动性好、附着率高、耐侵蚀和冲刷的优点,使用寿命提高了30%以上,取得了良好的经济效益.     

Diamond-hard alloy macrocomposite material: Development and application

A new diamond-hard alloy macrocomposite material consisting of diamond grits (0.5–0.8 mm or more in size) and a WC-Co matrix has been developed. The material is characterized by high mechanical properties of the matrix (the same as for WC-Co monolithic hard alloys) while diamonds remain completely intact (no graphitization or dissolution in cobalt melt). This process does not require superhigh pressures. Hard-alloy samples sintered beforehand in conditions that ensure the maximum mechanical properties (1450–1500°C, 30–60 min holding) are used as initial materials. Hollows (cells) or ditches of specific sizes (depth, width) are made in these samples with mechanical or electrophysical methods, and then diamond crystals (grits) commensurate with the hollows, cells, or ditches are placed in them. Vacuum infiltration (brazing) at moderate temperatures (900–1150°C) with adhesion-active alloys (or metallized diamonds) is the final stage in the formation of the composite. Therefore, strong adhesion-mechanical fixation of diamond grits in the hard-alloy matrix is ensured. The new material is efficiently used in diamond bits.     

炼铁生产取料的建模及应用

炼铁取料系统是一个复杂、受多种条件制约的皮带输送系统.在炼铁生产过程中,如何在满足COREX冶炼需要的前提下,进行合理的取料调度,使皮带作业率保持在较低水平以降低运营成本是罗泾炼铁厂遇到的问题.利用建模仿真技术对罗泾炼铁厂的取料系统进行了建模,按照新的取料调度模式,皮带输送机的作业率可降低到58％,这为企业精益运行提供了直观依据.2012年初采用新的取料调度模式后,实际皮带作业率降低至67％,降低了罗泾炼铁厂的生产成本.     

中厚板分段多点成形及其数值模拟

为了解决分段多点成形过程中的技术难题,利用数值模拟软件对其成形过程进行数值模拟.以显式算法模拟加载成形过程,隐式算法模拟卸载回弹过程,从而实现分段多点成形的数值模拟.采用非均匀有理B(NURBS)样条曲线设计过渡区形状,探讨了过渡区大小对成形品质的影响.结果表明,在合理设计过渡区的情况下,分段成形品质好于一次成形.     

Coupled-column liquid chromatographic analysis of epirubicin and metabolites in biological material and its application to optimization of liver cancer therapy

A specific, sensitive and fully automated coupled-column LC method for the determination of the anthracycline cytostatic epirubicin and four metabolites in the biological materials human plasma, liver homogenate and liver tumour homogenate has been developed. System-integrated sample processing was achieved using a new restricted access silica precolumn packing. This porous Alkyl-Diol Silica (ADS) was specially designed for the direct and repetitive injection of proteinaceous samples. It consists of a hydrophilic and electroneutral external particle surface (glyceryl-residues) and a hydrophobic reversed-phase internal surface (butyryl-, octanoyl- or octadecyl-residues). These bimodal chromatographic properties allow retention of low molecular analytes by classical RP-chromatography exclusively at the lipophilic pore surface. Macromolecular constituents of the sample matrix (e.g. proteins) are size-excluded by 5 nm pores and quantitatively eliminated in the interstitial void volume. On-line analysis was performed by coupling a C4-Alkyl-Diol precolumn (20 x 4 mm i.d., particle size 25 microns) and LiChrospher RP Select B analytical column (250 x 4 mm i.d., particle size 5 microns) via an electrically driven six-port valve. Separation of the parent compound and its metabolites was achieved with a mobile phase consisting of water (0.1% triethylamine, v/v, pH 2.0 adjusted with trichloroacetic acid)-acetonitrile (70:30, v/v) at a flow rate of 1 ml min-1. The analytes were detected using their natural fluorescence (excitation 445 nm, emission 560 nm). The method described is used for the determination of pharmacokinetics of epirubicin and its metabolites in order to evaluate and optimize treatment regimen of liver cancer chemoembolization therapy.     

鞍钢石灰回转窑耐火材料长寿与节能材料的应用

基于冶金石灰回转窑传统耐火材料砌筑方法,针对鲅鱼圈冶金石灰回转窑煅烧带耐火材料使用寿命短及隔热效果差导致窑皮温度过高的问题进行研究。通过改变耐火材料材质及砌筑方式,使该部位耐火材料使用寿命由8~10个月延长到18~24个月;通过使用NJS纳米级微孔隔热毡使窑皮温度在同等工况条件下降低46℃,每年因此降低能源费用195万元。实践证明,通过耐火材料砌筑优化后回转窑耐火材料故障率及能耗水平均得到显著降低,取得较好经济效益和社会效益。     

铅析法及其应用

本文扼要介绍了国内不常见的铅析法的基本概念、过程、特点,并介绍了粗铜、阳极泥、冰铜三种试样的湿法预处理及与铅析法相结合的流程。