The Economic Efficiency of Sampling Size: The Case of Beef Trim

The economically optimal sample size in a food safety test balances the marginal costs and marginal benefits of increasing the sample size. We provide a method for selecting the sample size when testing beef trim for Escherichia coli O157:H7 that equates the averted costs of recalls and health damages from contaminated meats sold to consumers with the increased costs of testing while allowing for uncertainty about the underlying prevalence rates of contamination. Using simulations, we show that, in most cases, the optimal sample size is larger than the current sample size of 60 and, in some cases, it exceeds 120. Moreover, lots with a lower prevalence rate have a higher expected damage because contamination is more difficult to detect. Our simulations indicate that these lots have a higher optimal sampling rate.     

A review of RFID technology and its managerial applications in different industries

Radio frequency identification (RFID) is an emerging technology that is increasingly being used in supply chain management. RFID technology plays an important role in supporting logistics and supply chain processes because of their ability to identify, trace and track information throughout the supply chain. The technology can provide suppliers, manufacturers, distributors and retailers precise real time information about the products. This accurate knowledge of the inventory would result in lower labor cost, simplified business processes and improved supply chain efficiency. If properly used, it has the potential to cut ordering lead time and cost on inventory control, increase the accuracy of inventory information, help avoid stockouts and boost the number of inventory turns. In this paper, we provide an overview of the current state of RFID applications in different industries and its impact on business operations. We provide extensive literature survey and develop a framework for future research areas in this field.     

Informal Referrals,Employment, and Wages: Seeking Causal Relationships

Employers and job seekers rely extensively on informal referrals to fill vacancies or to find a job. The widespread use of job contacts has been largely associated with labor outcomes, such as finding a job or even affecting wages. This paper explores whether the use of informal referrals on the job search process affects labor market outcomes of Colombian urban workers. Results indicate that informal referrals are slightly more successful than other job search strategies in term of job seeker's placement. However, referred workers earn in average less than their non‐referred counterparts. Yet, this is only true in formal‐sector positions.     

The Access of the Young Graduates in Sciences into R&D Profession: A Switching Model Treatment for the French Case

We address the question concerning the choice of graduates in sciences and engineering to look for employment in research and development. We use an endogenous switching regression to avoid the existence of self‐selection biases. The study shows that human capital is decisive where both employment opportunities and remuneration are concerned within, but not without, this sector. The results also suggest that in the early stages of a career, the R&D sector is less rewarding than other types of employment only for doctors and not for graduates from engineering schools.     

The role of deliberate and experiential learning in developing capabilities: Insights from technology licensing

We discuss the interdependencies between deliberate and experiential learning in developing a dynamic technology licensing capability, which was termed ‘desorptive capacity’ in earlier conceptual work. We use new three-year lagged data from two surveys of 79 firms to examine the role of dedicated licensing employees and prior licensing experience in developing firms’ sensing, seizing, and transforming capacities in technology out-licensing. The findings emphasize capabilities’ multidimensionality and critical trade-offs due to interdependencies between deliberate and experiential learning in developing capabilities. Besides interdependencies with experiential learning, deliberate learning strengthens sensing and seizing capacity, but it negatively affects transforming capacity based on inertia.     

Intention to emigrate in transition countries: the case of Albania

We analyse the profile of potential emigrants from Albania using data from the Central and Eastern Europe Eurobarometer in 1992. Respondents were asked to rate on a four-point scale the likelihood that they would go to live in Western Europe. Our results show that intention to emigrate is correlated positively with males, education and certain occupations, and negatively with age. There is little relation between emigration and income. Those who support the introduction of a free market in Albania are also more likely to emigrate than those who do not. Received: 24 August 1998/Accepted: 17 April 2000     

α-Al_2O_3中三角Ru~(3+)中心的g因子研究

基于晶体场模型,采用三角对称下4d5离子各向异性g因子微扰公式,对α-Al2O3中三角Ru3+中心的电子顺磁共振实验结果进行了理论研究。计算中利用较新的Ru3+自由离子旋轨耦合参数,考虑了轨道缩小因子和旋轨耦合参数对杂质Ru3+中心g因子的影响,讨论了Ru3+中心的局部结构性质,结果表明理论与实验符合得很好。     

H2O2与UV／TiO2协同体系光催化降解酸性品红的研究

采用高压汞灯为光源，考察了H2O2与UV／TiO2协同体系对酸性品红的降解效果。结果表明：H2O2提高了UV／TiO2光催化降解酸性品红的速率。同时，研究了影响纳米TiO2光催化降解酸性品红的主要影响因素。实验结果表明：初始PH值等于7时，光催化效率最佳；随着初始浓度的增加光催化降解效率降低；TiO2的最佳用量为0．2g/L。     

制革铬鞣废水中铬(Ⅲ)的治理和回收利用

采用沉淀－双氧水氧化法，对制革铬鞣废水中铬（Ⅲ）的治理和回收利用进行了研究．该法对铬（Ⅲ）的回收率可达９２％，处理后废水澄清，无色，无味，稳定，ｐＨ值８～８．５．     

从达斡尔族、鄂温克族共有“乌力斯哈拉”看民族交融——以历史人物博穆博果尔、卜奎为中心

中国达斡尔族和鄂温克族的氏族组织由“哈拉”构成,而且都有“乌力斯哈拉”。文章结合博穆博果尔、卜奎这两个历史人物,探讨达斡尔族和鄂温克族共有的“乌力斯哈拉”的关系。经研究认为,达斡尔族和鄂温克族共有的“乌力斯哈拉”属于“民族互渗”的交融现象,博穆博果尔、卜奎是这两个民族共同认同的历史人物。博穆博果尔和卜奎的事迹是中华民族交往交流交融史的生动实例。这充分说明各民族交往、交流、交融程度不断加深,形成了你中有我、我中有你、谁也离不开谁的多元一体格局。由此可见,中华民族多元一体交融汇聚的历史,是由一个个具体的事实组成的。