碎矿工艺改造与生产实践

通过对碎矿工艺进行技术改造，选用技术性能优良的碎矿设备，降低了碎矿产品粒度，使球磨机处理能力提高19％，提高了选矿厂经济效益。     

改进碎矿工艺 实现多碎少磨

黄沙坪铅锌矿选厂对碎矿工艺、检查筛分筛孔尺寸、Φ1750中碎前预筛筛孔尺寸、中碎排矿口等条件进行调整，实现多碎少磨，技术可靠，能降低成本，提高了经济效益。     

排山楼金矿碎矿技术改造及生产实践

对排山楼空矿碎矿技术改造及生产实践进行了简明的论述，认为对碎矿工艺流程进行挖潜技术改造是现有黄金矿山扩大生产规模、增加黄金产量、提高企业经济效益的最有效途径。     

关于碎磨矿中的能耗与节能

从破碎比、碎矿与麻矿流程，碎矿与磨矿设备叙述了选厂的耗能与节能的关系。     

云南某矿山提高矿石处理能力实践

云南某矿山选厂碎矿系统能力偏低，最终碎矿粒度偏大，与球磨机需求不匹配，导致生产组织困难。该矿山为了提高矿石处理能力，经过考察、研讨及试验研究，确定将GP11F圆锥破碎机更换为GP330圆锥破碎机，并对配套的筛分设备进行改进，减少粗碎设备负荷，提高细碎生产效率。改进后，该矿山碎矿效率提升至160～180 t/h,碎矿最终产品粒度-12 mm含量提升至71%,磨矿处理能力稳定提升至2 029 t/d,为降低选矿能耗提供了有力的保障。     

用TI545可编程序控制器改造碎矿控制系统

针对德兴铜矿泅洲选矿厂二期碎矿控制系统存在的问题，用可编程序控制器取代原继电器一接触器联锁控制，进行了基于可编程序控制器的碎矿控制系统设计与实现。系统应用后取得良好效果。     

可TI545可编程序控制器改造碎矿控制系统

针对德兴铜矿泗洲选矿厂二期碎矿控制系统存在的问题，用可编程序控制器取代原继电器－接触器联锁控制，进行了基于可编程序控制器的碎矿控制系统设计与实现，系统应用后取得良好效果。     

德兴铜矿大山选厂碎矿系统分析与技术改造

分析了德兴铜矿大山选厂碎矿系统存在的问题，提出了技术改造方案，实施改造后，取得了好的效果。     

碎矿与磨矿技术发展及现状

阐述了碎矿与磨矿在国民经济中的地位和作用,从多个角度综述了我国碎矿与磨矿的技术发展现状．并对其今后发展方向进行了分析。     

计算机在碎矿系统中的应用

本文介绍大型选矿厂碎矿系统利用计算机及相应自动化仪表进行集中监控,提高了碎矿系统的台时效率,实现了“多碎少磨”,节能降耗显著。     

电感耦合等离子体原子发射光谱法测定铍中11种杂质元素

铍中铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌等11种杂质元素含量的准确测定,是判定铍材是否合格的重要指标。目前,上述杂质元素的测定标准为GJB 2513A—2008《铍化学分析方法》,方法分别采用光度法和原子吸收光谱法对各元素逐一测定,测定周期很长。试验采用盐酸-硝酸溶解样品,选择Al 308.215nm、Co 230.786nm、Cr 284.325nm、Cu 324.754nm、Fe 261.187nm、Mg 285.213nm、Mn 260.569nm、Ni 221.647nm、Pb 182.205nm、Si 250.690nm、Zn 213.856nm为分析谱线,采用标准加入法(MSA)配制标准溶液系列消除基体效应的影响,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌,从而建立了铍中11种元素的测定方法。各待测元素校准曲线的线性相关系数均大于0.9995;各元素的定量限为0.001%~0.002%。实验方法用于测定铍样中铝、钴、铬、铜、铁、镁、锰、镍、铅、硅和锌,结果的相对标准偏差(RSD,n=10)为0.63%~8.6%,回收率为90%~110%。按照实验方法测定铍样中上述11种元素,测定结果与采用GJB 2513A—2008测定的结果吻合。     

Management of Fluid Mud in Estuaries, Bays, and Lakes. II: Measurement, Modeling, and Management

Techniques for measurement, modeling, and management of fluid mud are available, but research is needed to improve them. Fluid mud can be difficult to detect, measure, or sample, which has led to new instruments and new ways of using existing instruments. Multifrequency acoustic fathometers sense neither density nor viscosity and are, therefore, unreliable in measuring fluid mud. Nuclear density probes, towed sleds, seismic, and drop probes equipped with density meters offer the potential for accurate measurements. Numerical modeling of fluid mud requires solving governing equations for flow velocity, density, pressure, salinity, water surface, plus sediment submodels. A number of such models exist in one-, two-, and three-dimensional form, but they rely on empirical relationships that require substantial site-specific validation to observations. Management of fluid mud techniques can be classified as those that accomplish: Source control, formation control, and removal. Nautical depth, a fourth category, defines the channel bottom as a specific fluid mud density or alternative parameter as safe for navigation. Source control includes watershed management measures to keep fine sediment out of waterways and in-water measures such as structures and traps. Formation control methods include streamlined channels and structures plus other measures to reduce flocculation and structures that train currents. Removal methods include the traditional dredging and transport of dredged material plus agitation that contributes to formation control and/or nautical depth. Conditioning of fluid mud by dredging and aerating offers the possibility of improved navigability. Two examples—the Atchafalaya Bar Channel and Savannah Harbor—illustrate the use of measurements and management of fluid mud.     

Review of Alcoholism: A bio-psycho-social approach.

Reviews the book, Alcoholism: A bio-psycho-social approach by Jerome David Levin (1990). This small volume sets its task as providing counseling students with a comprehensive knowledge base "summarizing biochemical, pharmacological, physiological, anthropological, sociological, epidemiological, historical, and psychological findings on alcohol and its use and abuse" (Preface, p. xi). It treats each of these, in varying degrees of depth, in seven chapters. Perhaps the greatest strength of the book is its thorough presentation of the medical consequences of alcoholism, the mechanisms involved, and the interplay between biological and psychological factors. Unfortunately, this volume does not provide sufficient coverage of treatment-related issues. It may serve as an introductory overview of the alcoholism field for undergraduate or graduate students, or professionals from other fields. It is too advanced, however, in its use of concepts and language, for paraprofessional students. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电感耦合等离子体原子发射光谱法测定锰铁合金、锰硅合金和金属锰中8种微量元素

锰铁合金、锰硅合金、金属锰中铅、砷、钛、铜、镍、钙、镁、铝的含量决定了产品质量,以往常采用化学法或原子吸收光谱法进行测定,但存在准确度较差或测定速度不能满足要求等问题。为了实现上述元素的准确、快速测定,建立了采用电感耦合等离子体原子发射光谱法(ICP-AES)测定锰铁合金、锰硅合金和金属锰中微量铅、砷、钛、铜、镍、钙、镁、铝的方法。实验以硝酸、盐酸、氢氟酸、高氯酸分解样品,并使硅与氢氟酸反应生成四氟化硅挥发除去,试液中剩余共存元素主要有铁、锰等。实验结果表明,铁不干扰测定,通过在标准溶液系列中进行锰基体匹配消除锰基体效应的影响。以2mL高氯酸和6mL盐酸混合酸(8%)作为分析介质,可以达到最佳分析效果。在各元素校准曲线线性范围内,线性相关系数在0.9992~0.9999之间;方法中各元素的检出限在0.0001~0.0040μg/mL。实验方法用于测定锰铁合金、锰硅合金、金属锰中铅、砷、钛、铜、镍、钙、镁、铝,结果的相对标准偏差(RSD,n=11)在2.2%~9.4%;回收率在95%~105%;选择7个实验室进行了验证试验,各实验室间结果基本一致;按照实验方法测定了4个标准样品(材字-32、YSB C 28618、YSB C 26605)中铅、砷、钛、铜、镍、钙、镁、铝,结果与认定值相吻合。     

电感耦合等离子体原子发射光谱法测定硅铁钡孕育剂中9种元素

采用硝酸和氢氟酸溶解样品,高氯酸冒烟驱尽硝酸-氢氟酸,盐酸溶解盐类,选择Ba 233.527nm、Fe 259.940nm、Ca 317.933nm、Mn 257.610nm、Cr 267.716nm、Al 394.401nm、Ni 231.604nm、Cu 327.396nm、P 178.284nm为分析线,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定钡、铁、钙、锰、铬、铝、镍、铜、磷,从而建立了硅铁钡孕育剂中钡、铁、钙、锰、铬、铝、镍、铜、磷等9种元素的测定方法。各元素校准曲线的相关系数均大于0.9995;方法中各元素检出限为0.00006%~0.00069%。按照实验方法测定标准样品GSB03-1607-2003中钡、铁、钙、锰、铬、铝、镍、铜、磷,结果的相对标准偏差(RSD,n=11)为0.63%~3.4%。实验方法用于测定标准样品GSB03-1607-2003和YSB14607-2001中钡、铁、钙、锰、铬、铝、镍、铜、磷,测定值与认定值基本相符。     

Contrasting Clogging in Granular Media Filters, Soils, and Dead-End Membranes

Clogging in porous media is a problem in environmental engineering, hydrogeology, soil science, and petrology. However, a comparison of the literature reveals qualitatively different clogging behavior in different porous media: in granular media filters, increasing clogging is associated with slower flow, more flocculated conditions, and smaller fractal dimensions. In soils and dead-end membranes, increasing clogging is associated with faster flow, more dispersed conditions, and larger fractal dimensions. This paper documents these differences, discusses them in light of two key intermediate variables, colloid accumulation and deposit morphology, then presents a new conceptual model that explains the reported clogging phenomena as a function of specific deposit, fractal dimension, and a new variable, deposit location. Testing this model is possible using recently introduced experimental techniques.     

分光光度-遗传算法同时测定锌、镉、钴、镍、锰

在pH9.3,乳化剂OP存在下,Zn2+,Cd2+,Co2+,Ni2+,Mn2+与5-Br-PADAP发生灵敏的显色反应,所形成的三元胶束络合物的吸收光谱严重重叠,单独测定相互干扰严重。本文将分光光度法与遗传算法相结合,对同一混合体系的总吸光度值进行解析,实现了5种组分的同时测定。模拟样品测定的相对误差一般小于±10%。     

Management of Fluid Mud in Estuaries, Bays, and Lakes. I: Present State of Understanding on Character and Behavior

Fluid mud is a high concentration aqueous suspension of fine-grained sediment in which settling is substantially hindered. It constitutes a significant management problem in rivers, lakes, estuaries, and shelves by impeding navigation, reducing water quality and damaging equipment. Fluid mud accumulations have been observed in numerous locations worldwide, including Savannah Harbor, U.S., the Severn Estuary, U.K., and the Amazon River Delta, Brazil. This paper describes the present state of knowledge on fluid mud characteristics, processes, and modeling. Fluid mud consists of water, clay-sized particles, and organic material and displays a variety of rheological behaviors ranging from elastic to pseudo-plastic. It forms by three principle mechanisms: (1) the rate of sediment aggregation and settling into the near-bottom layer exceeds the dewatering rate of the suspension; (2) soft sediment beds fluidized by wave agitation; and (3) convergence of horizontally advected suspensions. Once formed, fluid mud is transported vertically by entrainment and horizontally by shear flows, gravity, and streaming. If not resuspended, it slowly consolidates to form bed material. Quantitative relationships have been formulated for key fluid mud formation and movement mechanisms, but they rely on empirical coefficients that are often site- or situation-specific and are not generally transferable. Research to define general relationships is needed.     

Review of The handbook of constructive therapies: Innovative approaches from leading practitioners.

Reviews the book, The handbook of constructive therapies: Innovative approaches from leading practitioners by Michael F. Hoyt (see record 1998-07937-000). The range of therapies fitting within the "constructivist" rubric includes (but is not limited to) narrative, solution-focused, solution-oriented, possibility, dialogic, reflective, and various aspects of family therapy. How does one teach-or learn-constructivism? A handbook, after all, is designed as a guide that tells you how to do things. For some of these authors, constructivism is an attitude, a perspective, a way of listening and being in dialogue. It is evanescent, in the unique moment. Others share specific techniques, some of which have become nearly reified through workshop presentations. Taken as a whole, these chapters work both within and across each other, comparable to the effective functioning of reflecting teams. The many voices complement and add further meaning. Most chapters are engagingly and clearly written, inviting the reader to further comprehension. Case examples, some in considerable detail, add to that understanding. As the chapters intersect and "speak" to each other, the reader can reflect on the "meta issues": the role of therapist, who is therapist, what is therapy, and what is therapeutic. (PsycINFO Database Record (c) 2010 APA, all rights reserved)