火焰原子吸收光谱法测定金精矿中铅的测量不确定度评定

根据<测量不确定度评定与表示>(指南),以火焰原子吸收光谱法测定金精矿中的铅含量为例,对测量结果进行了不确定度评定.在分析了不确定度的重要来源(包括称样质量、工作曲线拟合、标准工作溶液及试液定容体积等引入的不确定度分量组成)基础上,对各不确定度分量进行了分析计算,求得合成标准不确定度为0.068%,扩展不确定度为0.14%.     

碘量法测定金精矿中铜的测量不确定度评定

根据《测量不确定度评定与表示》(指南),以碘量法测定金精矿中的铜质量分数为例,对测量结果进行不确定度评定。分析了不确定度的主要来源,包括称样质量、标准溶液的配制、标准滴定液的标定及样品测定等引入的不确定度分量。对各不确定度分量进行了分析计算,求得合成标准不确定度为0.077%,扩展不确定度为0.16%。     

火花源光谱法测定钢中微量硼的不确定度评定

对火花源光谱分析法测定中低合金钢中微量硼过程的测量不确定度来源进行了分析。建立了测量过程的数学模型,对测量过程中的修正值、工作曲线线性化、高低标校正等不确定度分量进行了分析,对测量结果的不确定度进行了评定。在评定中发现对样品合成标准不确定度贡献最大的是工作曲线线性因素,其次为修正值中控制样品偏差值引入的不确定度,因此在该方法测定微量B时,工作曲线所用标样、控制样品的选择要慎重,最终计算出了扩展不确定度。     

金属薄板塑性应变比(r值)测量不确定度的评定

为评定深冲钢塑性应变比(r值)的测量不确定度,以厚度规格为80mm的St14试样为例,建立了计算r值不确定度的数学模型,确定了影响r值的各项因素,主要有试样原始宽度及其变形、试样原始标距及其变形4个输入量引入的不确定度和数值修约带入的不确定度,计算出了各因素的标准不确定度,r值的扩展不确定度为0.08,St14试样r值最终测量结果表达式为r=1.84±0.08。     

滚模拔制异型管变形规格的确定

对滚模拔制等壁方或矩形异型管的变形规格的确定做了专门性的研究,探讨了异型管截面外周长1n与周边压缩系数η对变形规格的影响。根据理论分析和实验结果,确定了20钢在变形规格的壁厚与外径之比为0.030～0.112时的η值范围及其变化规律,为变形规格的确定提供了重要依据。     

高频红外吸收法测定钨精矿中硫量的不确定度评定

研究采用了高频红外吸收法测定钨精矿中的硫含量,采用数学模型分析法确定了检测样品中不确定度的主要来源,并对标准物质、重复性的测定、分析仪器、助熔剂及瓷坩埚等各环节的不确定度分量进行了计算,得到钨精矿中硫含量的合成标准不确定度及扩展不确定度。结果表明:所测试钨精矿样品中硫含量的检测结果为0.24%,相对扩展不确定度为0.009 2%(k=2),最终得出影响不确定度的主要因素是标准物质,为实验室的质量控制提供了参考依据。     

直读光谱仪测定SWRH82B中锰元素不确定度评定

根据《火花源发射光谱法测定低合金钢测量结果不确定度评定规范》对火花源发射光谱法测定SWRH82B钢中锰元素含量的不确定度进行评定,分析了影响不确定度的主要来源,对测量重复性、标准样品标准值、曲线拟合等影响不确定度的分量进行分析,最后计算出合成标准不确定度和扩展不确定度,并找出影响不确定度主要因素。试验结果表明:标准样品标准值所引起的不确定度是该方法不确定度的主要来源。SWRH82B钢中锰元素含量为0. 69%时,其扩展不确定度为0. 02%(k=2)。通过对不确定度的分析,建立了测定SWRH82B钢中锰元素含量不确定度的分析方法,为合理评价本实验室检测结果提供了科学依据。     

X-射线荧光光谱法测定铁矿石中铁含量不确定度的评定

通过对X-荧光光谱法测定铁矿石中铁含量的不确定度进行评定,找到了测量结果的不确定度是由测量的重复性、回归工作曲线、标准物质、样品称量等引入的不确定度分量组成。在对各个不确定度分量进行量化评定的基础上,通过合成得到测量结果的标准不确定度,再乘以95%置信概率下的扩展因子2,得到测量结果的扩展不确定度。找出了影响铁矿石中铁含量分析结果准确性的主要原因,为检化验工作更科学、准确提供了依据。     

我国急缺矿产资源战略储备量的确定

中国急需分步实施、建立适合自身发展的急缺矿产资源战略储备体系,作为其基础的战略储备量的合理确定应先行.文章在分析急缺矿产资源战略储备量常用确定方法的基础上,利用现实可供量与趋势需求量的波动关系构建了急缺矿产资源战略储备量的确定模型,并以精炼铜为例进行了演示,初步确定2008年底中国精炼铜战略储备的合理规模为46.11万...     

金属矿山合理生产规模的影响因素分析

在介绍矿山合理生产规模的概念及其确定的基本原理基础之上,详细分析了影响金属矿山合理生产规模的主要因素,旨在为合理确定矿山生产规模提供依据。     

Concept-Based Method for Extracting Valid Subsets from an EXPRESS Schema

An EXPRESS schema is a data schema defined in EXPRESS, an international standard language for defining product data schemas. This technical paper proposes and formally defines a set of conditions for generating a minimum valid subset of an EXPRESS schema corresponding to a concept, where a concept is a general idea and a subset is a partial model of a data schema. We introduce a notion of “minimal set” to define the relationships between a subset and other subsets, and also between a subset and concepts. A minimal set is the smallest complete subset of a schema that corresponds to a concept. Using IFC, an international standard data model for the architecture, engineering, and construction industry, the proposed conditions have been implemented in a software application developed for extracting subsets from the IFC schema matching the concepts. A number of examples are demonstrated.     

The complete practitioner: Still a work in progress.

When one is reflecting on a career as a practitioner, a number of important influences, themes, and elements that contribute to being a successful practitioner are evident. The achievement of this success is not a solitary activity. Many role models and mentors serve as important influences and guides for developing as a professional over the course of one’s career. Ultimately, the goal is to aspire to become a complete practitioner. This includes being a passionate professional, clinically competent, a psychotherapist and clinician, an active consumer of research findings, ethical, a role model, a mentor, psychologically healthy, an advocate, a leader, a volunteer, an educator, a scholar, a colleague, a business person and entrepreneur, and an innovator and visionary; focusing on diversity and multicultural competence; and having a comprehensive vision of health. Because the goal of being a complete practitioner is aspirational, one never fully masters each of these roles and attributes but remains a work in progress. Yet, the process of endeavoring to become a complete practitioner is rewarding, gratifying, and meaningful. It is a journey well worth taking. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On twisted coalitions and perverse–narcissistic configurations: From positivistic Oedipal third to an existential relational third: A case study.

The authors discuss 4 verbatim sessions of a treatment of a difficult-to-reach patient who can be said in classical nosology to manifest a perverse narcissistic character configuration. The authors discuss the clinical material seen through 2 different lenses based on the classical and relational paradigms. The therapist, Michael Shoshani, worked in a rather classical psychoanalytic model in which perversion was understood in a 1-person or 1-mind mode. With this lens, perversion is seen as a result of the distorted primal scene in which the child is narcissistically inflated, creating the psychotic-like symbolic equation that the child is the father. The father is annihilated and the unique perverse world is created. In contrast, within the relational perspective, the authors see the intersubjective dynamic of mutually knowing and not knowing as being a paramount theme in the treatment of Mr. A. The known and unknown character that a child possesses of his mother's sexuality creates a potential for a relational third. The perversion is the experience of child and parent mutually feeling a sense of being too full of mutual knowledge and not knowing each other at all, leaving a sense of suffocation and stifled vitality. The relational perspective strives to create a transformation from suffocation and stifled vitality to move to a third place offering potential, thus enabling the enigmatic, seductive encounter of the knowing and not knowing to create a sense of mystery, lying between fact and fiction and between sameness and difference, seducing one to want and be, to love while respecting the given universal boundaries. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Three-Dimensional Modeling of Negatively Buoyant Flow in Diverging Channels

Diverging channels, also known as diffusers, represent common natural and industrial outlets to lakes, reservoirs, and rivers. If the outflow in a diffuser has a larger density than the ambient water, the inflow may plunge and form a density underflow. In this paper, a three-dimensional numerical study was conducted to gain insight into the mechanism of negatively buoyant flows in diffusers with a sloping bottom. Of particular interest is the formation of separated flows such as wall-jet and free-jet flows. Various cases of plunging and the associated density current in a diffuser with different divergence angles and inflow densimetric Froude numbers are considered. The model successfully simulates the formation of attached flow, wall jets, and free jets in a negatively buoyant environment. The onset, evolution, and stabilization of a stall and the subsequent development of a wall jet in a negatively buoyant flow are investigated in detail. Computed results also show favorable agreement with some published experimental data on density current generated by the plunging of cold water in ambient warm water in a diverging channel.     

Water Modeling of Optimizing Tundish Flow Field

 In the water modeling experiments, three cases were considered, ie, a bare tundish, a tundish equipped with a turbulence inhibitor, and a rectangular tundish equipped with weirs (dams) and a turbulence inhibitor. Comparing the RTD curves, inclusion separation, and the result of the streamline experiment, it can be found that the tundish equipped with weirs (dams) and a turbulence inhibitor has a great effect on the flow field and the inclusion separation when compared with the sole use or no use of the turbulent inhibitor or weirs (dams). In addition, the enlargement of the distance between the weir and dam will result in a better effect when the tundish equipped with weirs (dam) and a turbulence inhibitor was used.     

Alliancing in Australia—No-Litigation Contracts: A Tautology?

A project alliance is a business strategy whereby client and commercial participants’ objectives are aligned. This paper takes an alliance project between public and private organizations in Queensland, Australia as a case study and reports the critical factors identified that influence the success of the alliance project. Alliancing is a system that provides a collaborative environment and a framework to adapt behavior to project objectives. It is about sharing resources and experiences, exposing the “hidden” risks. The case study suggests that leadership has a strong influence on the alliance climate. Commitment and action by the Project Alliance Board (and, so, parent organizations) have a strong impact on the team and alliance culture, indicating alliancing has a high chance of failure when there is inadequate support from top management. Like all relational contracting approaches, trust between alliance partners is important. This case study project takes a further step toward reinforcing the trust element by placing a No-Dispute clause in the alliance agreement. A review of the effects of the no-litigation clause upon the project team is presented. The writers conclude that without a positive approach to relationship management, a No-Dispute approach is impossible. Hence, they postulate that a “no-litigation” alliancing contract is essentially tautological, and go on to argue that a no-litigation contract cannot exist without the help of a clear relational vision, that leads to both soft and hard infrastructure to assist in decision making and relationship building.     

Word integration and regression programming during reading: A test of the E-Z reader 10 model.

Participants read sentences with two types of target nouns, one that did and one that did not require a determiner to form a legal verb–noun phrase sequence. Sentences were presented with and without the critical determiner to create a local noun integration difficulty when a required determiner was missing. The absence of a required determiner did not influence 1st-pass reading of the verb, the noun, and the posttarget word. It did, however, have a profound effect on 2nd-pass reading. All three words were a likely target of a regression when a required determiner was missing, and the noun and the posttarget word were likely sources of a regression. These results are consistent with novel E-Z reader model assumptions, according to which identification of the noun should be followed by its integration, and integration difficulties can lead to the initiation of a regression to the noun. However, integration difficulties influenced eye movements earlier and later than predicted by the new model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Conflicts between Owner and Contractors: Proposed Intervention Process

The parties of a construction contract, the owner and contractor, are a society with a complex set of interrelated relationships requiring cooperation and collaboration to coordinate time, resources, and communication. The main goal of the parties involved in a project’s construction is to have a successful project constructed in accordance with the plans and specifications, within the time and cost originally anticipated. The success of a project depends on a number of variables, not the least of which is how the organizations approach problems and conflicts. However, the adversarial atmosphere that infects the industry can prevent the parties from reaching their goal. This paper proposes an intervention process, a combination of partnership and mediation, to prevent and resolve dispute prior to contract close-out.