越南出口贸易发展及其经济效应的实证研究（1999年—2010年）     

郑国富 《南宁师范高等专科学校学报》2011,28(2):39-43

1986年越南政府实施＂革新开放＂的新政策,大力发展＂出口导向型＂经济战略,积极融入世界经济体系。二十余年来,越南对外贸易发展取得了令人瞩目的成就,实证研究表明：出口贸易是越南实现和保持其国内经济快速增长的重要＂引擎＂。加入WTO后,越南＂革新开放＂迈入了新的发展阶段,努力提升出口贸易层次、优化贸易结构将是促进其国内经济持续、快速、健康发展的重要保障。在WTO框架下,越南出口贸易具有极其广阔的发展前景。  相似文献   

学业水平考试物理试题难度预估方法探究   总被引：1，自引：1，他引：0  

郭长江  牟亚萍 《考试研究》2013,(6):44-53

目前上海市普通高中学业水平考试未实行考前试测制度,因此试题难易度主要依据试题编制者的经验进行预估,尚无量化研究的方法。本研究根据国内外研究经验,从试题的物理概念、试题设计、数学运算三个项目出发,结合2011年上海市普通高中物理学业水平考试试题难度实测数据分析,构建试题难度预估的量化方法,并用2012年上海市普通高中物理学业水平考试试题难度实测数据检验其准确性,期望为今后物理试题难易度预估提供研究的基础。  相似文献   

三次样条函数在交通事故死亡人数预测中的应用     

王鹏岭  段虹霞 《运城学院学报》2013,(5):35-37

文章应用三次样条函数建立交通事故死亡人数预测模型,用MATLAB求解得到人口曲线,同时应用三次非多项式样条对交通事故死亡模型做出分析及预测,可通过不同参数选取来调控整个模型,得到预测结果．  相似文献   

不同海拔地区交替训练对运动员GH和IGF-I的影响     

甘春龙  赵晋  徐杨  吴翠翠  李振华 《四川体育科学》2014,(1):28-32

目的：探讨不同海拔交替训练对运动员生长激素和胰岛素样因子-I的影响。方法：长期生活在平原的男子运动员19人,分为两组：高原-平原交替训练组和高原-亚高原交替训练组。采用放射免疫法测试血清生长激素和胰岛素样因子-I的变化情况。结论：（1）通过两个阶段的交替训练,两个组运动员的GH和IGF-I变化幅度减小,运动员对于低氧刺激的调节能力增强了,有利于运动员更好的适应训练。（2）高原-亚高原组第二阶段GH、IGF-I整体水平要高于高原-平原组,表明在亚高原训练后可以更好的过渡到高原进行训练,减少运动员的适应期,有利于运动员在高原期间的训练。  相似文献   

基于ARMA模型的我国“十二五”时期财政科技支出预测分析     

胡志芳 《科技广场》2013,(5):211-213

科技投入是促进经济发展的主要途径和手段,国家财政科技投入水平代表政府对科技的重视程度。本文通过建立我国财政科技支出值的时间序列ARMA模型,对我国"十二五"时期的财政科技支出情况进行预测,以期为政府和企业制定相关政策提供参考和建议。  相似文献   

Effect of Growth Hormone on Plasminogen Activator and Inhibitor Activity in Rat     

P. Bubber  A. Sharma  A. Chauhan  D. D. Bansal 《Indian journal of clinical biochemistry : IJCB》2013,28(2):193-196

Growth retardation is one of the significant changes in chronic kidney disease (CKD) and is associated with increased morbidity and mortality. Disturbances in growth hormone (GH) are held responsible for several complications in CKD. GH is a protein based peptide hormone which directly or indirectly regulates renal functions to ensure homeostasis. We investigated the effects of growth hormone on plasminogen activators (PA) in rat kidney, PA and plasminogen activator inhibitor (PAI), glucose and fibrinogen in plasma and serum lipid profile. Rats were injected daily with 250 mU GH kg-1 body weight subcutaneously for one week. Growth hormone treatment increased PA activity significantly in rat kidneys as compared to controls. No changes were seen in PA, PAI and fibrinogen levels in the plasma of two groups of rats. There was significant decrease in plasma glucose, total cholesterol and LDL-cholesterol levels in serum of treated group resulting in the decrease of HDL/LDL and total cholesterol/cholesterol ratios. However, triglycerides and VLDL showed significant higher activity in the serum of treated group as compared to controls. Our data suggests that GH administration might improve renal function by increasing PA activity in kidney as well as by reducing the cholesterol content in blood. GH may be effective in improving growth failure as it helps to maintain the normal homeostatic balance.  相似文献   

Comprehensive screening and selection of okra (Abelmoschus esculentus) germplasm for salinity tolerance at the seedling stage and during plant ontogeny     

Ikram-ul- Haq  Asif Ali Khan  Iqrar Ahmad Khan  Muhammad Abubakkar Azmat 《Journal of Zhejiang University. Science. B》2012,13(7):533-544

The okra germplasm was screened for salinity tolerance at the seedling stage and during plant ontogeny. Substantial variation existed in okra for salinity tolerance at the seedling stage. An 80 mmol/L NaCl concentration was suitable for discriminating tolerant and non-tolerant okra genotypes. The pooled ranking of the genotypes, based on individual rankings for each trait (root and shoot length, germination percentage, and relative Na⁺ and K⁺) in individual NaCl concentrations, was effective for selecting tolerant genotypes. Genotypes selected at the seedling stage maintained their tolerance to NaCl during plant ontogeny, suggesting that screening of the germplasm entries and advanced breeding materials for salt tolerance at the seedling stage is effective. Among 39 okra genotypes, five were identified as the most tolerant genotypes and showed potential for use in breeding programs that focus on the development of salt-tolerant, high-yield okra cultivars.  相似文献   

“因材施教”原则下关于高中文理分科的思考     

王家伦  张长霖 《考试研究》2012,(3):30-36

对于高中文理分科,高校教师与理论工作者大多主张不分,而高中教师、学生与家长们大多主张分。改革必须正视适龄人口与当今教育的现实。与解放初期相比,我国人口增长了2．3倍,大学招生人数却增长了35．7倍,招生规模的激增扩大了考生的入学机会。普通高中空前发展,学生之间的竞争加剧,负担也随之加重。文理分科问题由于与学生学业负担密切相关也备受关注。要解决这一问题,必须遵循“因材施教”原则,对能适应“精英教育”的学生实施不分科教学,而对进入一般大学的大部分学生还得实施分科教学。  相似文献   

关于指数平滑法的改进及其在股市的应用     

翁东东 《临沧师范高等专科学校学报》2006,(1)

文章在二次指数平滑法的基础上,建立了三次指数平滑法的数学模型,从而提高了预测精度。  相似文献   

Great Expectations?     

Neil Sheldon 《Teaching Statistics》2004,26(3):84-85

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