激光粒度分析法在深州市第四纪沉积环境分析中的应用

采用Mastersizer2000 型激光粒度分析仪对河北省深州市南部一钻孔进行详细的第四纪沉积物粒度分析.所测数据利用SigmaPlot软件绘制出沉积物粒度频率曲线、概率累积曲线和粒度众数曲线.根据曲线变化情况,结合地质背景、岩性等相关资料,对研究区第四纪沉积环境进行分析解释.研究表明,激光粒度分析法能给出连续的粒径信息以便绘制各种粒度曲线,能够较灵敏地反映沉积环境及其水动力条件的细微变化.     

六盘水市野钟自然保护区黑叶猴生态及种群数量的春季调查研究

2004年4月3日至5月5日,笔者对黑叶猴进行了野外生态及种群数量调查研究,结果表明:(1)原野钟保护区内的黑叶猴仅有8群50只,其中包括1只当月生黄毛婴猴。猴群与1987年调查结果一样,但猴群个体数减少23只,主要是家庭成员减少;(2)保护区外围新发现7群59只,其中包括新增当月生4只黄毛婴猴;(3)黑叶猴的春季食物主要是被子植物的幼芽、叶和花;(4)野钟黑叶猴自然保护区应以黑叶猴分布及取食范围为依据,重新调整规划,建议下游从花嘎乡的底母村左侧河谷两侧到上游叉河北盘江两岸重新规划为黑叶猴自然保护区。     

城市住户调查中的样本轮换问题研究

从我国城市住户调查的实际情况出发，就城市住户调查中现行样本轮换方法、存在的问题及改进方法等方面进行了详细的阐述。     

有效教学理念下课堂讨论策略的运用

依据有效教学的理念，分析在课堂中实施讨论策略的重要性，并就如何在课堂中运用讨论策略提出见解，以期为提高课堂教学有效性提供借鉴和参考．     

A study of associations among attachment patterns,maltreatment, and behavior problem in institutionalized children in Japan

The present study investigates the relationships among children's history of maltreatment, attachment patterns, and behavior problems in Japanese institutionalized children. Twenty-nine children (12 boys and 17 girls) from three different institutions in the Kinki area (Western part of Japan) participated in this study. Their average age was 6. 41-years (ranging from 4 to 10). Thirteen of the children (44.8%) had history of maltreatment before they were institutionalized. Children's attachment was assessed by the Attachment Doll Play Assessment (George & Solomon, 1990, 1996, 2000). The child’s main caregiver answered the Child Behavior Checklist (CBCL; Archenbach, 1991) to identify children's behavior problems. Results indicated a significant relationship between maltreatment history and attachment pattern. The relationship between attachment pattern and behavior problem was also confirmed. Implications and limitations of this study were discussed.     

Does class-size reduction close the achievement gap? Evidence from TIMSS 2011

Policies about reducing class size have been implemented in the US and Europe in the past decades. Only a few studies have discussed the effects of class size at different levels of student achievement, and their findings have been mixed. We employ quantile regression analysis, coupled with instrumental variables, to examine the causal effects of class size on 4th-grade mathematics achievement at various quantiles. We use data from 14 European countries from the 2011 sample of the Trends in International Mathematics and Science Study (TIMSS). Overall, there are no systematic patterns of class-size effects across quantiles. Class-size effects are generally non-significant and uniform at different achievement levels, which suggests that in most European countries class-size reduction does not have an impact on student achievement and does not close the achievement gap. However, combined estimates across countries indicate that high achievers may benefit more from class-size reduction.     

国家创新体系、资本密度与我国上市公司研发投入——基于制度观视角

基于制度观IBV理论,采用2006—2013年6 854家沪深A股和中小板上市公司混合截面数据实证分析国家创新体系对企业研发投入的影响,OLS模型回归的结果显示:国家创新体系与下一期企业研发投入显著正相关,资本密度与企业研发投入显著负相关,而且资本密度会显著调节国家创新体系对企业研发投入的促进作用。     

外商直接投资对城市发展的影响效应研究

改革开放以来,外商直接投资(FDI)不仅成为中国城市创新的重要动力之一,而且也是中国经济巨大发展在城市领域的显著表现。通过采用定性与定量相结合方法进行研究发现：(1)FDI小规模进入一般不会改变城市性质,但可以提升、增加或改变城市的一般职能;随着FDI进入城市规模的扩大,城市性质就会发生变化;(2)城市经济实力要素对FDI具有很强的吸引力,FDI的直接作用结果又提高了城市经济实力和规模;(3)FDI通过经济开发区对城市空间结构产生很大影响。(4)城市体系是FDI的空间载体,FDI是城市体系演化的重要动力。城市政府要通过“引导、规范、治理、服务、经营”等调控手段,大力加强城市软环境的建设,高度重视城市产业集群的形成,适时促进城市职能与性质的转换,着力统筹城市空间组织的功能。     

企业、市场与技术创新研究述评

从企业规模、企业类型和市场结构的角度对技术创新进行综述、评论与展望。在对产业从技术和资金的角度进行分类的基础上,认为对于资金敏感型和技术+资金敏感型产业而言,企业规模与技术创新的关系是呈倒U字曲线的。综合考虑市场结构与企业规模,给出不同市场和企业规模下判定企业技术创新能力的一个模型。     

我国基础研究队伍的规模、结构和水平问题初探

本文通过实证和比较研究 ,考察了我国基础研究队伍建设的规模、结构和水平问题 ,并进行了相应的一些政策性思考