柠檬酸-凝胶法合成Sr_2CeO_4:Dy~(3+)的荧光光谱法测试

铈酸锶(Sr2CeO4)是一种具有一维链式结构的新型荧光基质材料。文章采用柠檬酸-凝胶法成功地合成了稀土Dy3+离子掺杂的Sr2CeO4荧光体(Sr2CeO4:Dy3+),并运用荧光光谱先进测试方法进行了表征。结果表明,Sr2CeO4:Dy3+荧光体中存在着从基质到稀土Dy3+离子的能量传递;在Sr2CeO4基质中,Dy3+离子的猝灭浓度高达0.5mol%。     

不同Nd3+和Yb3+掺杂浓度的YAG晶体内温度场分布研究

通过建立激光晶体热传导模型,针对相同基质YAG晶体不同掺杂离子,求解泊松方程,得到,并进行了对比分析.研究结果表明:在相同条件下,随着Nd3+和Yb3+掺杂浓度增加,YAG晶体端面中心温度升高,晶体中心轴温度衰减加快,热焦距则越小.但Yb3+掺杂浓度可以达到Nd3+掺杂浓度的近10倍而热效应基本相同.     

野八角化学成分的研究

综合运用各种色谱分离技术对野八角果实的95%乙醇提取物进行化学成分研究,利用各种波谱技术确定化合物的结构。该研究从野八角果实中分离得到10单体成分,分别鉴定为:de-4′-O-methylyangambin(1)、辛夷脂素(2)3′-O-demethylepipinoresionl(3)、lariciresinol dimethyl ether(4)、去氢双松柏醇(5)、杨梅树皮素-3-O-α-L-鼠李糖苷(6)、山柰酚(7)、槲皮素(8)、山柰素3-O-α-L-鼠李糖苷(9)、槲皮素-3-O-α-L-吡喃鼠李糖基(1→6)-β-D-吡喃葡萄糖苷(10)。其中,化合物1-3为首次从八角属中分离得到。     

南宁市城市大气环境中PM_(2.5)与PM_(10)相关性分析

文章利用2017年1月份南宁市大气环境中的PM_(2.5)、PM_(10)的日均值浓度数据进行分析,结果表明:PM_(2.5)、PM_(10)的浓度呈显著的相关性,相关系数为0.97,一元回归方程为y=0.678 6x+2.689,R~2=0.948 8。     

原子荧光法测定土壤中汞的方法研究

本法采用氢化物发生—原子荧光法测定土壤中的汞,将土壤样品在(1+1)王水介质中消解,在(1+4)HCl介质中,用硼氢化钾将Hg还原为Hg0,测定其荧光强度。对测定条件最佳化进行分析,本法采用冷原子化法,使用于土壤样品中w(Hg)/10-6=0.005-5的连续测定。     

二OO三年度全国会计专业技术资格考试中级会计资格中级会计实务(一)参考答案

一、单项选择题1、C2、B3、B4、D5、A6、D7、C8、A9、B10、C11、D12、C13、C14、C15、A二、多项选择题1、AC2、ABCD3、BC4、ABC5、AC 6、ABCD7、BC8、ABCD9、CD10、AD三、判断题1、√2、×3、√4、×5、×6、√7、√8、×9、×10、√四、计算分析题1.(1)编制购入该无形资产的会计分录借:无形资产300贷:银行存款300 (2)计算2001年12月31日该无形资产的账面余额账面余额=300-300/10×1/12-300/10×4=177.5(万元)(3)编制2001年12月31日对该无形资产计提减值准备的会计分录借:营业外支出35.5贷:无形资产减值准备35.5 (4)计…     

基于石墨烯/离子液体/壳聚糖修饰电极的制备及对2-羟基-4-甲氧基二苯甲酮的测定

文章利用滴涂法制备了氧化石墨烯/离子液体/壳聚糖化学修饰电极,并用于2-羟基-4-甲氧基二苯甲酮的检测。实验利用扫描电镜和透射镜分别表征了氧化石墨烯的表面形貌和内部结构。此外,实验考察了2-羟基-4-甲氧基二苯甲酮的电化学行为,结果表明,2-羟基-4-甲氧基二苯甲酮在282 nmol/L~1 992 nmol/L浓度范围内,其浓度和峰电流呈良好的线性关系,且线性回归方程为:Ipa(μA)=-0.008 C(nmol/L)+0.2101(n=6,R2=0.9 978),检测限为1.5×10-7M(S/N=3),可用于污水中2-羟基-4-甲氧基二苯甲酮的测定。     

大孔树脂纯化杠板归总黄酮的工艺研究

目的:研究大孔树脂纯化杠板归总黄酮的最佳工艺参数条件。方法:用紫外分光光度法测定,以杠板归总黄酮的吸附率和解吸附率为考察指标,考察杠板归总黄酮在3种不同类型大孔吸附树脂(D101,AB-8,NKA-9)上的吸附和解吸附行为,通过动态吸附试验考察不同上样浓度、不同体积分数的乙醇、pH值对洗脱效果的影响等因素选择其工艺参数。结果:在实验条件下,最佳纯化工艺为在pH=6条件下,以AB-8型大孔树脂为吸附剂,体积分数为70%的乙醇为洗脱剂,上样浓度为21.34mg·mL~(-1)。结论;该方法简便易操作,纯化工艺的效果比较好。     

K离子弱掺杂ZnO薄膜的光电性能研究

本实验通过在玻璃衬底上,采用溶胶-凝胶法制备K+、Mg2+共掺杂Zn O薄膜,固定K+与Zn2+摩尔比,改变Mg2+的掺杂含量,实验表明随着Mg2+掺杂量增加,薄膜的致密性更好,透光率不断提高,说明薄膜随着Mg2+浓度增加,结晶性能提高,Mg2+的掺入有利于薄膜的结晶,掺入薄膜中的离子浓度增大,从而增大了载流子浓度,但是当浓度过高时,过多的Mg2+进入间隙位会阻碍离子的运输,不利于薄膜的择优取向生长。     

果蔬脯中还原糖的测定

糖在分析上直接以还原糖法测定的糖为还原糖,如葡萄糖、果糖、麦芽糖和乳糖等。而其它糖如蔗糖、淀粉及许多碳水化合物也能以还原糖法进行测定,那就是将它们在一定的条件下进行水解,使其生成还原性的糖。C12H22O11+H2O→C6H12O6+C6H12O6(C6H10O5)n+nH2O→nC6H12O6     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.