Si-Ca-Sr-Ba四元复合合金的试制

介绍了Ｓｉ－Ｃａ－Ｓｒ－Ｂａ合金的试制情况，指出Ｓｉ－Ｃａ－Ｓｒ－Ｂａ合金的生产技术上可行，可在铸造行业推广应用。     

硅钡合金在炼钢脱氧中的应用研究

从理论上对Ｂａ,Ａｌ,Ｃａ等３种元素和脱硫能力进行了分析对比,并在生产实践中对Ｓｉ－Ａｌ－Ｆｅ,Ｓｉ－ＣａⅡ,Ａｌ,Ｓｉ－Ｃａ等５种合金进行了对比试验,通过对试验结果的分析,发现Ｓｉ－Ｂａ合金具有较强的脱氧能力和使夹杂物变质的能力,同时,还能脱硫。用Ｓｉ－Ｂａ合金处理的钢材,其冲击韧性得到了明显改善。     

Si-Ca-Sr-Ba复合合金冶炼的热力学分析

利用热力学状态图,化学反应等温方程式对硅石、石灰、锶矿、重晶石矿冶炼Ｓｉ－Ｃａ－Ｓｒ－Ｂａ复合合金进行了分析,结果表明在矿热炉内加入以上炉料,可以炼得具有强的脱氧与脱硫能力的Ｓｉ－Ｃａ－Ｓｒ－Ｂａ合金。     

Si—Ca—Sr—Ba复合合金冶炼的热力学分析

利用热力学状态图,化学反应等温方程式对硅石、石灰、锶矿、重晶石矿冶炼Ｓｉ－Ｃａ－Ｓｒ－Ｂａ复合合金进行了分析,结果表明在矿热炉中内加入以上炉料,可以炼得具有强的脱氧与脱硫能力的Ｓｉ－Ｃａ－Ｓｒ－Ｂａ合金。     

硅钡铁合金冶炼过程中Si－Ba－C－O系热力学分析

通过对硅钡铁合金冶炼过程中Ｓｉ－Ｂａ－Ｃ－Ｏ系内反应的热力学计算和分析，提出了该合金冶炼过程的反应模式。     

硅钡铁合金冶炼过程中Si—Ba—C—O系热力学分析

通过对硅钡铁合金冶炼过程中Ｓｉ－Ｂａ－Ｃ－Ｏ系内反应的热力学计算和分析，提出了该合金冶炼过程的反应模式。     

银在铋系高温超导体中的作用及应用

从五个方面综述了银在Ｂｉ－Ｐｂ－Ｓｒ－Ｃａ－Ｃｕ－Ｏ系（ＢＰＳＣＣＯ）超导体中的作用及应用，包括：（１）银与铋系超导体的基本复合方式；（２）银与Ｂｉ－Ｐｂ－Ｓｒ－Ｃａ－Ｃｕ－Ｏ系的物理化学作用；（３）银复合对铋系超导相生长的影响；（４）银复合对铋系超导体超导电性的影响，（５）银复合对铋系超导体材料力学性能的影响。     

稀土钡镁硅铁合金密度和熔化温度范围测定及物相分析

设定ＦＥ３－５％，Ｍｇ６－１０％，Ｂａ４－８％，Ｓｉ～４０％余量为铁（质量百分数）的稀土钡镁硅铁合金，测得该合金的密度为３．７４－４．１４ｇ／ｃｍ＾３，其熔化温度范围为１０５０－１１４０℃，Ｘ射线衍射分析表明主要物相为ＦｅＳｉ２，Ｍｇ２Ｓｉ，ＦｅＳｉ，ＲＥＳｉ２，ＢａＳｉ２，Ｓｉ及新相Ｂａ５．６Ｃｅ２．６Ｓｉ７Ｍｇ１１。     

脱氧工艺对钢中B类夹杂物的影响

针对车轮钢Ｂ类夹杂物，采用４种脱氧工艺进行了试验研究。结果表明：采用真空精炼能有效地降低钢中Ｂ类夹杂物，使用Ｓｉ－Ａｌ－Ｂａ终处理有了的效果，采用喂Ｓｉ－Ｃａ－Ｂａ线及Ｓｉ－Ｃａ线工艺效果更佳。     

BaO—CaO—Na2O—CaF2—Cr2O3渣系的不锈钢脱磷

测定了１５００℃时磷在ＢａＯ－ＣａＯ－Ｎａ２Ｏ－ＣａＦ２－Ｃｒ２Ｏ３渣子和０．１２Ｃ－０．７１Ｓｉ－１８Ｃｒ不锈钢熔体之间的分配比，试验结果表明，该渣系的不锈钢脱磷能力比ＣａＯ基渣好，与ＢａＯ基渣相当。     

交工资料整编归档是建筑施工管理的重要内容

交工资料整编工作是建筑工程项目的一个重要环节，资料整编的完整性、准确性、系统性对提高工程档案的质量有着极其重要的作用。实践证明，这项工作本身是艰巨的，并且与整个建筑施工过程相联系，是施工管理的重要组成部分，也是工程全面竣工的重要标志。     

Review of Divorced families: A multidisciplinary developmental view.

Review of Divorced families: A multidisciplinary developmental view (see record 1987-97107-000). This book is intended to provide all professionals working in the context of family issues and transitions with the beginnings of a model of the normal processes of divorce. As such, it is of interest to sociologists, policy makers, lawyers, mediators, researchers, and clinicians such as psychologists and social workers, in fact anyone who is interested in the changing face of the North American family. In general, this is a satisfying and inspiring work. It is comprehensive, covers a difficult and complex area in a systematic and integrated fashion, and suggests a positive health-promoting role for professionals in this field. It is above all highly relevant to a wide range of professionals, in that the process of divorce is viewed as a sociological fact, a personal stressful experience, a crisis of family restructuring, and a phenomenon calling for more empirical research and theoretical model building. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Refined Solutions of Externally Induced Sloshing in Half-Full Spherical Containers

A mathematical model is developed for calculating liquid sloshing effects such as hydrodynamic pressures and forces in half-full spherical containers under arbitrary external excitation. The velocity potential is expressed in a series form, where each term is the product of a time function and the associated spatial function. Because of the spherical configuration, the problem is not separable and the associated spatial functions are nonorthogonal. Application of the boundary conditions results in a system of coupled nonhomogeneous ordinary linear differential equations. The system is solved numerically, implementing a typical fourth-order Runge-Kutta integration scheme. The proposed simple methodology is capable of predicting sloshing effects in half-full spherical containers under arbitrary external excitation in an accurate manner. Hydrodynamic pressures and horizontal forces on the wall of a spherical container are calculated for real earthquake ground motion data. Dissipation effects are included in the present formulation, and their influence on the response is examined. Finally, it is shown that for the particular case of harmonic excitation, the system of ordinary differential equations results in a system of linear algebraic equations, which yields an elegant semianalytical solution.     

Industrial Psychology as an Academic Discipline.

The potential conflict for the industrial psychologist in a liberal arts setting is that in one role he is on the side of theory, broad social concern, and contributions to the liberal education of his students, and in the other role, on the side of practical techniques for getting things done, concern for a more limited sector of society, and vocational preparations of his students. This paper is a personal effort to clarify a personal conviction that such conflict is unreal and unnecessary. While industrial psychology is indeed a professional field of practical endeavor, and while it does in fact offer much that is useful to managers and administrators, it is also a broadly significant body of knowledge that intrinsically deserves to grow. In short, it is the author's conviction that industrial psychology is or can become an academic discipline occupying a rightful place within the liberal arts setting of Academia. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Extending Monte Carlo Simulations to Represent and Propagate Uncertainties in Presence of Incomplete Knowledge: Application to the Transfer of a Radionuclide in the Environment

This work is devoted to some recent developments in uncertainty analysis of environmental models in the presence of incomplete knowledge. The classical uncertainty methodology based on probabilistic modeling provides direct estimations of relevant statistical measures to quantify the uncertainty on the model responses thanks to a nice mixing between Monte Carlo simulations and the use of efficient statistical treatments. However, this approach may lead to unrealistic results when not enough information is available to specify the probability distribution functions (pdfs) of input parameters. For example, if a fixed (i.e., the pdf is a Dirac distribution) variable is unknown between a and b, the proper way to model this knowledge is to consider a set of δc distributions (a δc distribution means that the probability that the parameter is equal to c is 1 and 0 elsewhere), c belonging to [a,b]. This is quite different from assume an equidistribution. Thus, to respect the real state of knowledge in industrial applications, a new modeling based on the theory of evidence is introduced. It allows an extension of classical Monte Carlo simulations by relaxing assumptions related to the choice of probability distribution functions and possible dependencies between uncertain parameters. To illustrate the principle of our modeling, a comparison with the probabilistic modeling is given in the case of the transfer of a radionuclide in the environment.     

Generalized Masing Approach to Modeling Hysteretic Deteriorating Behavior

The modeling of hysteretic behavior is of significant importance in several areas, including civil engineering and mechanics. This paper focuses on finding a method for modeling hysteretic behavior that is simple and efficient in terms of capturing the response and retaining the memory, if any, and at the same time is proper for use in physically meaningful modeling and identification of the system with few parameters. A distributed-element model (DEM) capable of capturing deterioration is used as a starting point, and its characteristics are studied, with a particular focus on the way memory is stored in the model. It is observed that keeping track of the response at a few of the past extremes of input displacement, called the Sequence of Dominant Alternating Extremes, is enough for representing the effect of history. The relation of this behavior to a generalized Masing model is studied. A set of rules is proposed which is a generalization of the Masing rules and can capture the deteriorating (or nondeteriorating) response of DEMs with any distribution of element yield displacement thresholds to any arbitrary loading. The presented formulation provides a framework for efficient modeling and identification of dynamic models of very different characteristics with only a few physically meaningful parameters.     

Modeling Fate and Transport of Roadside-Applied Herbicides

A physically based, one-dimensional, mathematical model is developed to simulate transport of herbicides applied to roadsides into adjacent surface water. Herbicide transport by overland flow, infiltrating water, and subsurface flow is considered. The model accounts for advection, dispersion, equilibrium linear sorption in the soil, and first-order decay of the herbicides. Chemical transport between soil and overland flow is described using a rate-limited mass exchange between the two compartments that is proportional to the difference between the chemical concentration in overland flow and the pore water with a proportionality constant that is a function of overland flow characteristics and rain intensity. For simulating overland and subsurface flow, the kinematic wave equation is solved using a Crank–Nicolson finite difference scheme. Richards’ equation is solved using a Galerkin finite element method to model infiltration, and the transport equation is solved using a finite difference method. The model is calibrated and verified using extensive field data on the runoff of five herbicides with a range of physical–chemical properties at two field sites. Good agreement is obtained between predicted and measured event-mean concentrations in runoff and the herbicide concentration remaining in the application-zone soil.     

Analytical Study of Turbulent Pollutant Dispersion near a Low Hill

An analytical methodology is developed to study the pollutant dispersion in a turbulent wind flow over a two-dimensional hill with a small slope. As in a typical boundary layer problem, the flow domain is divided into an inner and an outer region: the inviscid outer region is further subdivided into an upper and a middle layer while the viscous inner region is subdivided into a shear stress and an inner surface layer. Based on the Reynolds-averaged Navier–Stokes equations and the continuity equations, closed form analytical solutions of the stream functions and velocities are readily obtained for all regions in the domain. The velocity information is then imported into the diffusion equation, and the pollutant concentration distribution is readily solved. For reasons of turbulent shear, a variational method with adjustments to the streamline coordinate system is used to obtain an accurate solution of the pollutant concentration. Results show that when the source is located in the upper layer, the concentrations decrease with distance along the upwind side of the hill and tend to reach a constant value rapidly near the hilltop. Similar results are observed when the source is located in the middle layer. However, due to the reduction of wind speed in the middle layer, the concentrations become saturated at a later upslope position as compared to the source in the upper layer. This methodology is shown to be able to provide a quick and accurate estimate of local pollutant patterns and can be applied to any flow field provided that the streamlines can be specified through the velocities.     

Validation of a Source–Receiver Model for Road Traffic-Induced Vibrations in Buildings. II: Receiver Model

The objective of part II of this paper is to couple the validated source model for free-field traffic-induced vibrations, which has been presented in part I of the paper, to a receiver model that incorporates the structure and accounts for dynamic soil–structure interaction. The incident wave field is applied to the structure and the response is calculated using a subdomain formulation for dynamic soil–structure interaction. A finite element method is applied to the structure, while the unbounded soil domain is calculated with a boundary element method using the Green’s functions of a homogeneous or a layered half-space. The results of elaborate in situ experiments in and around a single family dwelling during the passage of a truck on joints in a concrete pavement and on a plywood unevenness, are used for the validation of the numerical prediction model. The predicted structural response during the passage of a truck at a speed v = 50?km/h is compared with the experimental results. The agreement between the numerical and the experimental results is very good for the passage on the plywood unevenness and satisfactory for the passage on the joints between the concrete plates.     

SAE1144钢铸坯中硫化物分布及其偏析行为分析

SAE1144是典型的中碳高硫易切削钢,钢中硫化物的形貌、大小、空间分布、偏析是影响其产品性能的关键因素.对国内某厂生产的SAE114连铸坯取样,采用金相显微镜、扫描电镜、夹杂物三维腐刻技术等表征方法开展硫化物形貌的解析,分析了铸坯中硫化物类型、空间分布、三维形貌的变化规律,并总结了硫偏析的规律.研究发现,SAE114...