A Placement Study in Secondary School Economics

Quite often in data reduction, it is more meaningful and economical to select a subset of variables instead of reducing the dimensionality of the variable space with principal components analysis. The authors present a neglected method for variable selection called the BI-method (R. P. Bhargava &; T. Ishizuka, 1981). It is a direct, simple method that uses the same criterion—trace information—used in ordinary regression analysis. The authors begin by discussing the nature and properties of the BI-method and then show how it is different from other existing variable selection methods. Because the BI-method originally was applied to small datasets that had little or no relevance to psychology or education, the authors apply it to large datasets with relevance to the psychological and educational literature. Of particular interest was the application of the BI-method to select a subset of items from a large item pool. Two practical psychometric examples with 49 and 108 items, respectively, showed that item subsets selected with the BI-method reflected the underlying structure of the whole item pool and that the scales based on those item subsets showed good reliability and predictive validity. The appropriateness of this item selection method within the context of the domain-sampling model is discussed.     

贮藏温度对鱼腥草地下茎保鲜效果的研究

将鱼腥草地下茎置于室温(30±2℃)、19±1℃和4±1℃下贮藏,研究贮藏温度对其外观、营养成分含量变化的影响.室温下,2d后,根变黑,茎变绿色,有的茎尖已腐烂;5d后,已不能食用.19±1℃下,9d后,根、茎尖、茎切口处开始腐烂;22d后,已不能食用.4±1℃下,32d后,茎切口开始腐烂,根干枯;42d后,已不能食用.三个温度下,含水量、脂肪、蛋白质都是随着贮期的延长而缓慢的降低;维生素C的含量都是随着贮期的延长先升高后降低;可溶性糖在室温下随贮藏期延长而升高,其余两个温度下随着贮期的延长先升高后降低.     

软件构件在专家系统开发平台中的应用研究

软件构件和专家系统平台作为构造专家系统的有效手段已经进入应用阶段.本文通过研究专家系统的工作原理、体系结构以及多种专家系统技术,提出了一个专家系统平台的设计方案和实现.     

从词汇成分看古汉语对赣语形成与发展的影响

研究表明,赣语中的词汇成分源远流长,复杂多样.从其来源看,既有苗蛮语、百越语的底层成分.又有吴楚语和其他古方言或语种的遗留与借用成分,而其中最为重要的是华夏汉语的基础成分.它决定了赣语形成与发展的根本方向.本文就赣语中的古汉语词汇成分,撷其数例,考其语源,藉此彰显古汉语对赣语形成与发展的重大影响.     

Relationship of “weekend warrior” and regular physical activity patterns with metabolic syndrome and its associated diseases among Chinese rural adults

Little is known about the “weekend warrior” pattern of physical activity (PA) where people perform all their PA in 1 or 2 sessions per week. We investigated the relationship of weekend warrior and other PA patterns with metabolic syndrome (MS) and its associated diseases. Data on sociodemographic and lifestyle characteristics were collected from the Nantong Metabolic Syndrome Study that included 13,505 women and 6,997 men between 2007 and 2008. Compared with inactive participants, weekend warriors were at lower risk of MS, diabetes, and hypertension; respective odds ratios (95% confidence intervals) for men and women were 0.58 (0.43–0.79) and 0.67 (0.52–0.86), 0.52 (0.34–0.79) and 0.52 (0.33–0.83), and 0.79 (0.63–0.99) and 0.71 (0.57–0.89). Similar results were observed with regular activity, at a frequency of >3 sessions per week. Both weekend warrior and regular PA patterns showed a 10–60% decrease in abnormal triglycerides, glucose, and blood pressure in both sexes; abnormal waist circumference in men only; and abnormal high-density lipoprotein in women only. Our observed cross-sectional relationships reflect that >150 min/week of moderate PA or 75 min/week vigorous-intensity PA is needed to prevent MS and its component diseases, even if in a short-bout, intermittent PA pattern.

Abbreviations: MS: Metabolic syndrome; WC: Waist circumference; TG: Triglycerides; HDL-c: High-density lipoprotein cholesterol; BP: Blood pressure; SBP: Systolic blood pressure, DBP: Diastolic blood pressure; PA: Physical activity; JIS: Joint Interim Statement; CVD: Cardiovascular disease; ATP III: US Third Report of the National Cholesterol Education Program, the Adult Treatment Panel; IDF: International Diabetes Federation; IPAQ: International Physical Activity Questionnaire; BMI: Body mass index; CDC: the Nantong Centers for Disease Control; OR: Odds ratio; CI: Confidence interval; SD: Standard deviation; IQR: Interquartile range.     

语篇情景制约与翻译教学——一个系统功能语言学的视角

话语范围、话语基调和话语方式,是决定语篇特征的三个最重要的情景因素,制约着从源语到译语语篇生成的过程、翻译策略的选择和语篇对等的实现。将语篇的情景制约引入翻译教学,开启了翻译教学的新视野,有助于学生从宏观和微观两个方面进行操作,有效提高翻译质量。     

现代维语中名词构形附加成分省略现象分析

现代维语中名词构形附加成分的省略主要表现在名词数范畴,领属人称语法范畴以及格范畴的省略。现代维语中名词构形附加成分的省略可能由三个方面的原因造成：一是语言接触和语言影响;二是语言使用中的经济原则：三是句法手段的作用。本文主要从结构主义语言学角度对现代维语中名词构形附加成分的省略现象及其范围进行分析,并探讨省略出现的原因。     

褶牡蛎成分组成及营养学评价研究

为对褶牡蛎的营养进行评价,试验测定褶牡蛎的基本成分和氨基酸组成,并对氨基酸进行评分．结果表明：牡蛎中蛋白质和不饱和脂肪酸含量极高,其中牛磺酸和必需氨基酸营养学评分高,含有丰富的矿物质锌、铁、钙等,说明褶牡蛎具有较高的营养价值．     

水稻分蘖成穗与产量组成关系分析

本文通过对水稻分蘖成穗与产量组成数量关系的分析表明：提高成穗率即可提高产量及其组成因子;群体穗数与产量多呈负相关,单株穗数与产量多呈正相关;群体的苗、茎（蘖）、穗与成穗率多呈负相关,单株的茎（蘖）、穗与成穗率多呈正相关。     

相律中的“组分数”之我见

相律中的“组分数”定义在阐述上不够确切,导致了长期来讲解和理解两方面的诸多困难和贾解,根据“组分数”K＝S－R”这个定义式．我认为：把组分数定义为：足以确定体系各相组成的物种数减去相数以外的其余两类独立关系数后所得到的物种数．