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     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

Multinomial distributions applied to random sampling of particulate materials

When sampling a batch consisting of particulate material, the distribution of a sample estimator can be characterized using knowledge about the sample drawing process. With Bernoulli sampling, the number of particles in the sample is binomially distributed. Because this is rarely realized in practice, we propose a sampling design in which the possible samples have a nearly equal mass. Expected values and variances of the sample estimator are calculated. It is shown that the sample estimator becomes identical to the Horvitz–Thompson estimator in the case of a large batch-to-sample mass ratio and a large sample mass. Simulations and experiments were performed to test the theory. Simulations confirm that the round-off error due to the discrete nature of particles is negligible for large sample sizes. Sampling experiments were carried out with a mixture of PolyPropylene (PP) and PolyTetraFluorEthylene (PTFE) spheres suspended in a viscous medium. The measured and theoretical variations are in good agreement.     

The Early History of the Cumulants and the Gram-Charlier Series

The early history of the Gram-Charlier series is discussed from three points of view: (1) a generalization of Laplace's central limit theorem, (2) a least squares approximation to a continuous function by means of Chebyshev-Hermite polynomials, (3) a generalization of Gauss's normal distribution to a system of skew distributions. Thiele defined the cumulants in terms of the moments, first by a recursion formula and later by an expansion of the logarithm of the moment generating function. He devised a differential operator which adjusts any cumulant to a desired value. His little known 1899 paper in Danish on the properties of the cumulants is translated into English in the Appendix.     

Capturing the Implications of Services Trade Liberalization

This paper evaluates the impact of service sector trade liberalization on the world economy by a ten-region, eleven-sector CGE model with import embodied technology transfer from developed countries to developing countries. Simulation results show that service sector trade liberalization not only directly affects world service production and trade, but also has significant implications for other sectors in the economy. The major channel of the impact is through inter-industry input-output relations and TFP growth induced from services imported by developing countries from developed countries, which may be embodied with new information and advanced technology.     

Performance appraisal and culture: practice and attitudes in Hong Kong and Great Britain

This article compares the practice of and attitudes towards performance appraisal for managerial and professional staff in Hong Kong and Britain, and considers the extent to which actual practice and employee preferences are in alignment. Findings suggest that appraisal may be more widespread in Hong Kong than in Britain. However, British appraisal tends to be more participative and to place greater emphasis on discussing objectives, development and career plans. Hong Kong appraisals appear to be more directive and Hong Kong respondents perceive a higher level of 'negative' appraiser behaviour. In spite of this, Hong Kong respondents show if anything slightly more confidence in the utility of appraisal than do British respondents. They show stronger support for appraisal's use for reward and punishment and less support for the objectives-setting and training and development uses than do the British sample. Hong Kong respondents are more likely than their British counterparts to favour involving a more senior manager in appraisal, and they are less likely to prefer more frequent appraisals. There was little evidence that Hong Kong respondents had a stronger preference for group-based appraisal criteria, although they did show more support than the British sample for the use of personality as a basis for appraisal. Overall, the suggestion is that appraisal has been adopted in Hong Kong organizations but that the practice of appraisal has been adapted to suit the cultural characteristics of the society.     

Narrative construction of expatriate experience and career cycle: discursive patterns in Finnish stories of international

Expatriate experience is not only a disconnected occasion for cross-cultural anxiety and adjustment but also an important event in the process of self-development and learning. Following this view and arguing for a discursive approach, the paper focuses on ways in which expatriates themselves tell and interpret their development and movement across expatriate career cycle. Meaning systems connecting expatriate job with previous and following work experiences in career stories of Finnish engineers and managers were identified using a combination of narrative and discourse analysis. No evidence was found of an autonomous expatriate discourse but, in contrast, expatriate career cycle was narrated using available organizational repertoires of development and career. Describing and discussing the meaning-making properties of three identified discourses - bureaucratic, occupational and enterprising - the paper emphasizes the organizational environment of expatriate experience while acknowledging the limits of these contemporary career vocabularies in addressing individual learning and change in cross-cultural settings.     

Internet professionals: job skills for an on-line age

The paper explores the increasing popularity of the Internet technology Singapore. It argues that the diffusion of Internet technology to South-East Asia would create new duties and responsibilities for human resource (HR) managers. One such duty is the identification of the skills which professional Internet staff would need to perform their work effectively in organizations. Using a triangulation research method, empirical study has identified the new professional Internet jobs which have emerged the IT industry in Singapore and the skills that professional Internet personnel require do their jobs effectively. Analysis of the findings indicates that professional Internet skills involve both technical and creative abilities and that, in explaining or defining professional Internet skills, it is necessary to use both the technical and the social conceptions of skill. This argument is based on the view that the creative skills include tacit skills so that a definition based solely on the technical conception of skill cannot capture the various dimensions of Internet skills. The implications of the research findings for human resource managers are raised.