Effect of europium doping levels on photoluminescence and thermoluminescence of strontium yttrium oxide phosphor

The present paper deals with the effect of europium (Eu³⁺) doping concentration (0.1–2.5 mol%) on photoluminescence (PL) and thermoluminescence (TL) of strontium yttrium oxide (SrY₂O₄) phosphor. The sample was prepared by the modified solid state reaction method, which is the most suitable method for large-scale production. The prepared phosphor sample was characterized by using X-ray Diffraction (XRD), field emission gun scanning electron microscopy, fourier transform infrared spectroscopy, high resolution transmission electron microscopy, photoluminescence, thermoluminescence and commission internationale de I׳Eclairage techniques. The PL emission was observed in the range of 410–630 nm for the SrY₂O₄ phosphor doped with Eu³⁺. Excitation spectrum was found at 254 and 325 nm, sharp peaks were found around 593, 615 and 625 nm with high intensity. From the XRD data, using Scherrer׳s formula, calculated average crystallite size of Eu³⁺ doped SrY₂O₄ phosphor is around 32 nm. Thermoluminescence study was carried out for the phosphor with UV and gamma irradiation. The TL response of SrY₂O₄:Eu³⁺ phosphor for two different radiations was compared and studied in detail. The present phosphor can act as a single host for white light emission in display devices. The detailed process and possible mechanisms for PL and TL are studied and discussed. For the variable concentration of Eu³⁺ on PL studies the PL intensity increases with increasing the concentration of dopant and the concentration quenching found after 2 mol% of Eu³⁺ the optimized concentration was 2 mol%, which is suitable for the display device application. In TL glow curve the optimized concentration was 1 mol% for the UV irradiated sample and 0.2 mol% of Eu³⁺ for the gamma irradiated sample and beta irradiated sample for 10 Gy dose. The kinetic parameters were calculated by the computerized glow curve deconvolution (CGCD) technique.     

A computerized potentiometric system for structural and functional anthropometric measurements

A prototype computerized potentiometric system was developed for structural and functional anthropometric measurements. The system uses four potentiometric units, a power supply unit, and a computer with analogue/digital (A/D) converter to measure the position of a movable stylus in three (X, Y, Z) dimensions. The system is easy to use, more accurate, and more cost effective than other existing systems. It has been found to be accurate for the intended application, faster than the manual methods available, and much less expensive than the photographic and opto-electronic systems currently available. For use in the industrial setting, a portable version of the system is envisaged in the future.     

The virtual biomodel as a complementary resource for the diagnosis of mandibular ankylosis

Ankylosis of the mandibular joint is one of many pathologies that affect the temporomanbibular joint. It comprises the mandible condyle, the base of the skull bone and the joint itself, inducing changes in the skull bone and face complex, affecting their growth to different degrees, which can cause morphofunctional alterations. The objective of this paper is to show the gains of using a virtual biomodel as an additional resource in the diagnosis of mandibular joint ankylosis, besides the analysis of multiplanar slices.     

An environment for automated measurement of energy consumed by mobile and embedded computing devices

Mobile and embedded computing devices have become the dominant type of computing platforms. Energy-efficiency is a key requirement for these devices, underscored by growing reliance of consumers on services delivered through them and their growing complexity and sophistication. A detailed measurement-based characterization of energy consumed by applications running on mobile and embedded computing devices is important for both device manufacturers and application developers, as it may identify energy-demanding components and activities and guide optimizations. In this paper, we describe an environment for automated energy measurements of applications running on Android mobile and bare embedded computing devices. We discuss hardware and software aspects of the environment and several approaches to runtime capturing and timestamping of activities of interest. Finally, we demonstrate the use of the environment in several case studies conducted on two smartphones and a wearable device.     

宙斯M-300激光雕刻机在建筑模型制作过程中的应用

随着时代发展,模型制作也逐渐由传统的手工制作向半手工半工业科技相结合过渡。为了培养复合型专业人才与社会接轨,部分高校引进了比较先进的激光雕刻机用于相关专业的本科教学中。通过人机之间的慢慢摸索与磨合,逐渐了解宙斯M-300激光雕刻机性能、工作方式和具体应用事项,同时也体会到其发挥的重要作用。     

浅论会计职业道德建设

随着市场经济关系的日趋复杂,会计实践中的非理性行为越来越多,其最直接的后果就是导致会计信息失真。主要表现有：乱挤乱摊成本、费用,虚假发票和原始凭证,截留或隐瞒收入,私设“小金库”,设置多套账,编造和提供虚假财务报表等。会计信息失真,已经成为普遍关注的重大社会问题。这些问题的产生与会计职业道德密切相关。要保证会计信息的真实可靠,会计机构和会计人员必须具备良好的职业道德。文章从消极方面谈会计外部行为环境对会计职业道德的影响。     

三维激光扫描技术在故宫古建修缮工程中的应用研究

利用三维激光扫描技术,人类将实现对故宫建筑群原状资料的高精度永久留存。修缮人员可以在点云上直接量取所需数值,并勾绘建筑外形用于设计制图;也能加工点云得到用于监测古建结构变形情况的三角网模型,及用于代替现状测绘图纸的正射影像图。     

关于财务云的设计与应用初探

云计算的兴起给各行各业带来的巨大的冲击，其给信息化变革带来颠覆性变革的同时，也存在着一定的难点需要解决。本文主要针对目前云计算对会计信息化（简称财务云）带来的变化和影响方面进行分析和研究，进而为寻求会计信息化迎接云计算时代提出几点思考。     

A semantic analysis approach for assessing professionalism using free-form text entered online

This paper presents the results of an experimental study to measure professionalism for the purpose of assessing a professional development program. Soft skills such as professionalism are increasingly recognized as important, yet measuring and assessing these skills, typically best acquired experientially, has remained challenging. Following established research, we conceptualize professionalism as a construct with the dimensions of autonomy, commitment, belief in public service, self-regulation, and the use of a professional organization as a major referent. We demonstrate how these dimensions can be expressed and the professionalism of free-form text responses measured. These responses are reflections submitted online by participants in a professional development program for undergraduate business majors known as the Management Achievement Program (MAP). Latent semantic analysis is employed to measure the professionalism of these responses and to assess MAP along each of the five dimensions. The method demonstrated in this paper has several advantages over existing methods for assessment, which can be costly, require considerable time and training, and are often tied to subjective interpretation. The method demonstrated here is suitable for replication that leads to continuous improvement by “closing the loop.”     

加强内部会计控制避免会计信息失真

会计信息失真，是制约社会经济秩序健康发展的一个顽疾。本文从单位内部会计控制入手，分析会计信息失真的原因，同时提出加强内部会计控制，寻求避免会计信息失真的途径。