Preparation of Nano-Particles （ Pb, La）TiO3 Thin Films by Liquid Source Misted Chemical Deposition

Nano-particles lanthanum-modified lead titanate (PLT) thin films are grown on Pt/Ti/SiO2/Si substrate by liquid source misted chemical deposition (LSMCD). PLT films are deposited for 4-8 times, and thenannealed at various temperature. XRD and SEM show that the prepared films have good crystallization behavior and perovskite structure. The crystallite is about 60nm. The deposition speed is 3nm/min. This deposition method can exactly control stoichiometry ratios, doping concentration ratio and thickness of PLT thin films. The best annealing process is to bake at 300℃ for 10min and anneal at 600℃ for 1h.     

University reputation and undergraduates’ self-perceived employability: mediating influence of experiential learning activities

ABSTRACT

Stratification, in the form of silent exclusion that is experienced by some groups of students because of the perceived low reputation of the university attended, and which the students have no control over, has been observed as a social menace that works against the concept of equity in education. To address this problem, a need exists for universities with lower reputations to go the extra mile to develop the employability skills of their students, which, in turn, will enhance their self-perception of employability. The major objective of this study was to investigate the influence of experiential learning activities on the relationship between university reputation and self-perceived employability among undergraduates in South African universities. Data were collected by means of an adapted questionnaire from 402 respondents drawn from two universities in the same province in South Africa. To achieve our objective, four hypotheses were formulated and tested through Structural Equation Modelling (SEM) using AMOS 25. The findings show that both direct and indirect effects of university reputation on undergraduates’ perceived employability through experiential learning activities are positively significant. To minimise the negative effects that universities with low reputations are likely to have on undergraduates’ acquisition of experiential learning, on their self-perceived employability, and subsequently on their employment prospects, the government, the Department of Higher Education and universities (particularly, the low-rated ones in South Africa) need to put in place some timely interventions, some of which are suggested in the study.     

Effects of light curing modes and ethanol-wet bonding on dentin bonding properties

Objective

This study explored the effects of different light curing modes and ethanol-wet bonding on dentin bonding strength and durability.

Methods

A total of 54 molars were randomly divided into three groups: Single Bond 2, Gluma Comfort Bond, and N-Bond. Based on the three light-curing modes and presence or absence of ethanol pretreatment, the samples were assigned to six subgroups: high-light mode, ethanol pretreatment+high-light mode, soft-start mode, ethanol pretreatment+soft-start mode, standard mode, and ethanol pretreatment+standard mode. All samples were bonded with resin based on the experimental groups. After 24 h and 6 months of water storage, a universal testing machine was used to measure microtensile bond strength. Scanning electron microscopy (SEM) was applied to observe mixed layer morphology.

Results

The 24-h and 6-month microtensile bond strengths of the ethanol pretreatment groups were significantly higher than those of the non-ethanol pretreatment groups at the same light modes (P<0.05). With or without ethanol pretreatment, the microtensile bond strengths of the high-light modes were significantly lower than those of the soft-start modes and standard modes (P<0.05). The microtensile bond strengths of samples from the 6-month water storage group significantly decreased compared with those of samples from the 24-h water storage group (P<0.05). The soft-start groups and standard groups formed better mixed layers than the high-light mode groups, whereas the ethanol pretreatment groups formed more uniform mixed layers than those without ethanol pretreatment.

Conclusions

Ethanol-wet bonding technique, soft-start, and standard modes could improve dentin bonding properties.

     

内外控、自我和谐对完美主义与就业焦虑的中介作用

用完美主义问卷和就业焦虑等量表对620名大学生进行施测,用结构方程模型检验完美主义对就业焦虑的影响。结果显示,构建的回归模型拟合指标理想,作为自变量的完美主义和因变量的就业焦虑呈显著正相关,完美主义的降低有利于减轻个体的就业焦虑水平。内外控、自我和谐在完美主义对就业焦虑的影响中起中介作用。这验证了完美主义对就业焦虑的重要影响,为进一步探讨完美主义和就业焦虑间的因果关系提供了有力证据。     

Utilization of communications network potential: Public practices and effects

Technological adoption, with an emphasis on Information and Communications technology (ICT), is considered as a decisive factor for the overall development of each country. For this, the European Commission (EC) has launched a number of policy frameworks, aiming to enhance the usage and to improve the quality of European citizens' lives. However and so far, the results are still below the initial goals. Thus, the EC recently decided to set some additional targets, in order to facilitate a wider adoption of information services and maximize economical and societal benefits.     

工作场所偏离行为研究中自我报告法应用探讨

许多学者对自我报告法在工作场所偏离行为研究中的使用提出了质疑。本研究从研究方法角度,对工作场所偏离行为的调查方法进行了比较,并通过SEM多组分析法对传统自我报告法和"投射式"自我报告法进行了对比。研究发现"投射式"自我报告法可以改善自我报告法低报告问题,但两种方法在模型验证时所得到的研究结论不具有显著差异。这表明无论是传统自我报告法和"投射式"自我报告法都是工作场所偏离行为研究的有效方法。同时,本研究也验证了招聘和甑选、薪酬策略对工作场所偏离行为有显著影响。     

Sensation seeking and intercultural communication competence: A model test

Following findings from previous studies, the present study further explores the relationship between sensation seeking and intercultural communicative behaviours, specifically by investigating the relationship between sensation seeking and intercultural communication competence and re-testing a model introduced in a previous study. It was hypothesised that: (1) when mediated by variables associated positively associated with intercultural communication competence, there is a positive relationship between sensation seeking and intercultural communication competence, and (2) even in the presence of variables that are positively associated with intercultural communication competence, there is a negative relationship between ethnocentrism and intercultural communication competence. Survey data were gathered from participants (N = 231) and structural equation modelling was performed. The results supported both hypotheses, as well as findings from previous studies. The implications are discussed.     

青藏高原古岩溶风化壳红土中石英砂颗粒表面结构特征及环境意义

扫描电镜观测表明，青藏高原古岩溶风化壳红土中石英砂的表面结构特征以化学作用形成的为主，机械作用形成的为辅，反映了这类红土的长期残留特征，对应着风化壳红土发育时期，亦即高原晚第三纪古岩溶发育期的湿热气候．部分经过后期搬运的样品，表面机械作用形成的结构特征变得明显，反映了高原的后期抬升所引起的干寒气候条件．从表面结构的时间演化序列看，多数样品表现为化学结构上面叠加了机械结构，但也有在机械结构上面叠加化学结构的，这反映了自晚第三纪以来青藏高原环境变化的复杂性、多代性     

球类集体项目运动员对教练员信任的测量

信任是球类集体项目运动队中人员合作的基础,对于球队运动训练过程的顺利进行以及最终比赛成绩的获得都有着非常重要的作用。研究目的：编制符合球类集体项目特征、且符合心理测量学要求的运动员对教练员信任量表。方法：经过理论探讨、访谈等方法形成理论构想和条目池,分别以214名和407名大学高水平篮球运动员为被试,主要运用探索性因子分析、验证性因子分析等数理统计方法对量表进行信效度检验。结果：最终量表包括能力、仁爱心、公正一致性3个维度共计10个条目,具有较好的信效度。结论：量表的信效度符合心理测量学的要求,可作为球类集体项目运动员对教练员信任状况测量的有效、可靠的工具。     

基于SEM的公众太阳能光伏发电认知和采纳意愿的实证研究

当今世界,化石能源日益短缺、能源危机加剧,作为新能源和清洁能源的太阳能光伏发电应运而生,世界各国都加快了太阳能开发利用的步伐。公众作为太阳能光伏发电的采纳主体,直接影响着太阳能的开发利用及光伏发电的推广速度。因此,开展公众对太阳能光伏发电认知和采纳意愿的研究具有重要的现实意义。本文基于武汉地区330份有效调查问卷数据,采用结构方程模型对公众太阳能光伏发电认知和采纳意愿进行了实证研究。在理论分析和因子分析的基础上,提出了太阳能光伏发电认知与采纳意愿的概念模型和研究假设,构建了结构方程模型(SEM)并对概念模型和研究假设进行了实证检验。研究结果表明:1政府政策对公众的节能意识、太阳能光伏发电设备的选择倾向和采纳意愿均具有显著的积极影响,其中对公众的节能意识影响最大;2公众节能意识对其太阳能光伏发电的认知与太阳能光伏发电设备的采纳意愿产生显著的积极影响,其中对采纳意愿的影响最大;3公众的节能意识和公众认知对其选择倾向产生的直接影响未达到统计学显著水平,且公众认知和选择倾向对其采纳意愿产生的直接影响也未达到统计学显著水平。最后,基于上述研究结论,本文提出了相应的政策建议。