梧州-肇庆试验区地下水在线远程监测系统设计

针对珠江-西江经济带,梧州-肇庆流域的水域地质环境及地下水监测野外工作现状,研制一套环境适应性强的地下水动态在线监测系统。系统主要由监测传感器装置、远程数据传输装置及终端平台组成。地下水监测系统中的供电部分采用太阳能发电方式,解决了偏远地区取电困难的问题,实现自动化、智能化供电。监测数据采用GPRS传输方式,将采集到的数据传到监测平台。野外试验表明系统运行状况良好,实现了自动化采集及远程传输,提高了工作效率。     

硫酸掺杂聚苯胺制备及对Cu2+吸附性能研究

目的:研究硫酸掺杂聚苯胺对Cu~(2+)的吸附性能的影响。方法:采用化学氧化聚合法合成了硫酸掺杂聚苯胺,通过扫描电镜(SEM)、X射线衍射(XRD)、红外(FT-IR)、紫外-可见(UV-VIS)等对其形貌和结构进行了表征,研究聚苯胺对Cu~(2+)的吸附性能的影响。结果:制备得到的聚苯胺为小颗粒状,具有典型聚苯胺的UV特征吸收峰;在硫酸和苯胺的物质量比为1∶2时,用制备的聚苯胺0.25g,在50mL浓度为50mg/L的Cu~(2+)溶液中吸附30min,对Cu~(2+)的吸附率为86.1%,吸附容量为8.6mg/g。结论:硫酸掺杂的聚苯胺与其它酸掺杂的聚苯胺有相似的结构,对Cu~(2+)有很好的吸附效果,其吸附效果与吸附时间、Cu~(2+)溶液的初始浓度、掺杂酸浓度、聚苯胺用量等因素有一定的关系。     

Evaluating the effects of programs for reducing achievement gaps: a case study in Taiwan

Considering that achievement gaps have become a serious educational problem worldwide, the Ministry of Education in Taiwan has been addressing a series of policies to reduce achievement gaps, but the effect of these policies has not yet been carefully examined. Therefore, the present study investigated current educational policies, achievement gap phenomenon, and its changing trends in the use of national standardized tests in Taiwan and evaluated the degree to which these policies are reducing the achievement gaps among Taiwanese students. Junior high school graduates who took the high school entrance examination between 2004 and 2010 were recruited to examine the associations between their academic achievements and variables such as socioeconomic status (SES), ethnicity, and school district. Time series analyses were conducted to determine the longitudinal trends for the achievement gaps. The results revealed that achievement gaps are decreasing among different ethnicities, but they are increasing among different SESs and school districts. These findings demonstrate some positive effects of the educational policies introduced in Taiwan, but also the need for further modification and precise implementation of these policies. Suggestions for implementing educational programs and policies to reduce achievement gaps are also presented.     

Using Drawing Technology to Assess Students’ Visualizations of Chemical Reaction Processes

In this study, we investigated how students used a drawing tool to visualize their ideas of chemical reaction processes. We interviewed 30 students using thinking-aloud and retrospective methods and provided them with a drawing tool. We identified four types of connections the students made as they used the tool: drawing on existing knowledge, incorporating dynamic aspects of chemical processes, linking a visualization to the associated chemical phenomenon, and connecting between the visualization and chemistry concepts. We also compared students who were able to create dynamic visualizations with those who only created static visualizations. The results indicated a relationship between students constructing a dynamic view of chemical reaction processes and their understanding of chemical reactions. This study provides insights into the use of visualizations to support instruction and assessment to facilitate students’ integrated understanding of chemical reactions.     

体力活动、静坐行为与学前儿童体质健康的关系

体力活动和静坐行为是影响儿童早期体质健康的重要因素。本研究以152名学前儿童为被试,使用三轴加速度计测量体力活动和静坐行为,使用儿童型人体成分分析仪测量身体成分,使用《国民体质测定标准(幼儿部分)》测评身体素质,使用相关分析、多元回归分析和等时替代回归分析对它们之间的关系进行探究,结果发现在控制了性别、年龄、城乡、佩戴时间和静坐行为等因素后,中高强度体力活动尤其是高强度体力活动对去脂体重指数和身体素质(十米折返跑、立定跳远、双脚连续跳、走平衡木)依然具有显著影响;高强度体力活动替代其他强度体力活动或不同强度体力活动替代静坐行为后,去脂体重指数均有所提升;身体素质变化仅在高强度体力活动替代其他强度体力活动和静坐行为时具有方向一致性和显著性。家长和教师应充分重视中高强度体力活动尤其是高强度体力活动与学前儿童体质健康的紧密联系,促进学前儿童静坐行为和低强度体力活动向中高强度体力活动适度转化,以提升学前儿童下肢肌肉力量素质和灵敏素质等方面的体质健康水平。     

An empirical investigation of factors influencing the adoption of data mining tools

Previous studies explored the adoption of various information technologies. However, there is little empirical research on factors influencing the adoption of data mining tools (DMTs), particularly at an individual level. This study investigates how users perceive and adopt DMTs to broaden practical knowledge for the business intelligence community. First, this study develops a theoretical model based on the Technology Acceptance Model 3, and then examines its perceived usefulness, perceived ease of use, and its ability to explain users’ intentions to use DMTs. The model's determinants include 4 categories: the task-oriented dimension (job relevance, output quality, result demonstrability, response time, and format), control beliefs (computer self-efficacy and perceptions of external control), emotion (computer anxiety), and intrinsic motivation (computer playfulness). This study also surveys the moderating effect of experience and output quality on the determinants of DMT adoption and use. An empirical study involving 206 DMT users was conducted to evaluate the model using structural equation modeling. Results demonstrate that the proposed model explains 58% of the variance. The findings of this study have interesting implications with respect to DMT adoption, both for researchers and practitioners.     

将绿色化学引入大学课堂

科技的发展带给我们丰富的物质资源同时也破坏了我们赖以生存的环境,危害着我们的身心健康。为了还我们一个健康的生活环境,从20世纪中叶开始人们提出了绿色化学的概念。绿色化学具有原子经济性的特点,可以实现零排放,并且节约资源,对环境起到很好的保护作用。在高校化学教学中渗透绿色化学知识不仅拓宽了学生的知识范围,更重要的是教会了他们如何去热爱环境、保护环境和治理环境,实现人与自然的和谐相处,推动人类社会的全面协调可持续发展。     

中国薯蓣属根状茎组系统分类的初步研究

   本文根据我国薯蓣属(Dioscorea L．)根状茎组(Sect.  Stenophora Uline)的外部形态特征、细胞染色体数、花粉形态、植物化学成分、地理分布等的规律，证明根状茎组是该属中的一个比较原始的自然类群：1．具横走的多年生地下根状茎，其它组是一年生或多年生的块茎；2．大部分是2倍体，其它组是多倍体；3．花粉粒单沟型，外壁纹饰网纹或颗粒条纹，其它组为双沟型，外壁纹饰网纹；4．含甾体皂甙元(steroidal sapogenin)，其它组不含。   我们的研究观察证明，N．N．TepaCNMeHKO根据R.Knuth系统(1924)提出的薯蓣皂甙元在该属中无分布规律的说法是无充分依据的。   本文讨论了某些组或种的划分及系统位置：取消sect.Illigerestrum Prain et Burk.；将马    肠薯蓣(D．simulans Prain et Burk．)改属根状茎组；触丝薯蓣(D．tentaculigera Prain et Burk.)应列入顶生翅组  (Sect．shannicorea Prain et Burk．)，  并提出了盾叶薯蓣  (D. zingiberensis  Wright)和穿龙薯蓣(D．nipponica Makino)种的划分和定名的意见。     

多语种叙词表汉语翻译和维护方法

讨论了多语种叙词表汉语的翻译和维护工作,总结了多语种叙词表汉语翻译中应遵循的统一汉语叙词,基于概念、词间关系、自然语言等多项翻译原则,并分别给出具体翻译实例;文章还从目标语言翻译人员的角度,给出了两个维护工作的两个具体实例。