Price transmission across the U.S. food distribution system

Price transmission models are estimated using recursive methods across 100 food commodities. From the individual commodities, short- and long-run price transmission coefficients are estimated for rising and falling prices. These coefficients are classified into five commodity categories and expressed as one vector while coding for causality, market levels, rising/falling prices, short and long run, and time period. Then the impact of each variable is estimated and inferences are drawn about the degree of price transmission. Results show that price linkages are strong but slightly declining over time, with some evidence of asymmetric behavior. Long-run rising prices are passed through more than long-run falling prices, except for fruits and vegetables.     

发达国家高速铁路项目政府投融资经验借鉴及启示

政府投融资对高速铁路项目的建设具有重要作用。近年来,我国高速铁路项目发展很快,建设规模越来越大,现行的政府投融资模式已不适用,存在负债风险升高、建设资金紧张、投融资模式单一僵化等问题。通过借鉴日本、法国和韩国等发达国家高速铁路项目政府投融资的成功经验,我国应加快创新多元政府投融资模式,设置合理资本投资比例,并成立专门机构负责投融资运营管理,同时完善相应的立法政策,从而构建出与高速铁路建设可持续发展相适应的的政府投融资模式,促进我国高铁事业的进一步发展。     

开发综合教学项目 加强学生就业能力的培养——对《矿山通信与监控》课程综合教学的探索

本文作者注重开发综合教学项目,将传统的电气控制技术与先进的plc技术结合起来,使学生更加贴近现场实际;利用机电一体化设备和直流稳压电源,实现电牵引采煤机自动调速的具体化,提高教学效果。     

加快发展职业教育势在必行

文章根据国务院《关于大力发展职业教育的决定》的指示精神，深刻阐述了我们应当从实际出发，坚持以科学发展观为指导，继续解放思想，加快发展职业教育。     

中国发展指数(RCDI2009)与低碳经济测度

本文首先分析了中国发展指数的动态变化情况.结果表明,尽管发展水平的区域性板块格局并没有明显的变化.但各省区指数的增长速度却没有表现出这种态势.许多发展水平较为落后的地区,其指数增长速度都比较快.不过各省区的发展重心都不完全相同,发展方向没有明显的持续性.进而,本文研究了如何利用中国发展指数测度低碳经济的发展水平.基于中国能源消费结构的特点,本文研究了每万元GDP二氧化硫排放量与中国发展指数之间的关系.结果表明,中国发展指数可作为一种有效的测度指标来分析低碳经济的发展态势,而低碳经济的发展速度也可以通过指数的增长速度来进行分析.     

运输方式选择的决策模型

通过对各种运输方式，从速度、成本、便利性、运载力、安全性等方面进行综合比较分析，提出了运输数量与运输距离、运输容量与运输重量的函数关系、运输作业的五大基本原则和运输基础数据库的建立模式，最后提出运输方式选择决策的评价模式，为企业提供了运输方式选择的科学决策依据和模型。     

Strategic decision speed and firm performance

This 4‐year study examines the effect of strategic decision speed upon subsequent firm performance and identifies environmental and organizational characteristics that relate to decision speed. We draw upon strategic decision‐making theory and organization theory to propose that strategic decision speed mediates the relation between environmental and organizational characteristics and performance. Measures of business environment, organization structure, strategic decision speed, and firm performance (growth and profitability) were collected from 318 CEOs from 1996 to 2000. Structural equation modeling confirmed that fast strategic decision‐making predicts subsequent firm growth and profit and mediates the relation of dynamism, munificence, centralization, and formalization with firm performance. Copyright © 2003 John Wiley & Sons, Ltd.     

审视与解读沿海开放城市的经济发展

依据实际统计资料，对199l至2001年期间15个沿海开放城市的经济发展进行概略分析。并对其中若干值得关注与深思的现象进行初步解读。     

Combining predictive distributions for the statistical post-processing of ensemble forecasts

Statistical post-processing techniques are now used widely for correcting systematic biases and errors in the calibration of ensemble forecasts obtained from multiple runs of numerical weather prediction models. A standard approach is the ensemble model output statistics (EMOS) method, which results in a predictive distribution that is given by a single parametric law, with parameters that depend on the ensemble members. This article assesses the merits of combining multiple EMOS models based on different parametric families. In four case studies with wind speed and precipitation forecasts from two ensemble prediction systems, we investigate the performances of state of the art forecast combination methods and propose a computationally efficient approach for determining linear pool combination weights. We study the performance of forecast combination compared to that of the theoretically superior but cumbersome estimation of a full mixture model, and assess which degree of flexibility of the forecast combination approach yields the best practical results for post-processing applications.     

中国货币流通速度的实证考察(1980～2000年)

在考察1980～2000年货币流通速度特征后,分析并解说引致货币流通速度下降的成因,指出我国近期货币流通速度趋缓是由于资金循环链条的断裂所致。