China's Agricultural Technology Underway

The central policy document setting the tone for this year's agriculture,namely,Opinions of the Central Committee of the Communist Party of China and the State Council on Speeding up Innovation in Agricultural Science and Technology and Building up the Capacity to Guarantee Agricultural Product Suppliers,was issued on Feb.1.     

E-commerce:A Young, Fast-Growing Industry in China

China's e-commerce industry,though in its initial age is expanding rapidly.By 2015.the e-commerce market is expected to be worth over RMB 2 trillion and possibly surpass the size ofthe U.S.market,fuelled by the exponential growth in its online shopping according to a recent report by The Boston Consultiug Group.     

Guangxi promotes Sino-Vietnamese International Tourism Zone

South China's Guangxi Autonomous Region is making positive progress in promoting the construction of the Sino-Vietnamese International Tourism Zone,with consensus reached after rounds of negotiations with Vietnam concerning relative agreements,according to an official from Guangxi.     

＂Central China Delta＂ to be Built

China's central provincesJiangxi,Hunan and Hubei are making joint efforts to build a new urban hub in Central China along the middle reaches of the Yangtze River. The strategic cooperation framework agreement to build the cities of the middle reaches of the Yangtze Rivet was released at the conference held by the three provinces on Feb.10 in Wuhan,signifying the official start of establishing the new urban hub in Central China,China News Agency reported.     

Guangxi Promotes Sino-Vietnamese International Tourism Zone

South China's Guangxi Autonomous Region is making positive progress in promoting the construction of the Sino-Vietnamese International Tourism Zone,with consensus reached after rounds of negotiations with Vietnam concerning relative agreements,according to an official from Guangxi.     

Chinese Electric Bus Company Enters Japan

Chinese electric bus companies are expanding globally at a faster pace,with their advanced technologies and green mission.Japan-based Kyotokyukou Bus Incorporated,one of Japan’s largest transit operations,has taken delivery of 5 Long Range Battery Electric Buses from BYD Company Ltd,the largest domestic auto-manufacturer and electric-bus manufacturer in China.T-he BYD electric buses will be operated in Kyoto,a well known bartleground for     

确定活齿传动比的转角分析法

本文根据相对运动原理,建立了活齿传动各基本构件间的转角分析法。该方法应用简便、掌握容易,具有概念清楚、形象直观、答案准确等优点。     

Forecasting performance of multivariate time series models with full and reduced rank: an empirical examination

Since Quenouille's influential work on multiple time series, much progress has been made towards the goal of parameter reduction and model fit. Relatively less attention has been paid to the systematic evaluation of out-of-sample forecast performance of multivariate time series models. In this paper, we update the hog data set studied by Quenouille (and other researchers who followed him). We re-estimate his model with extended observations (1867–1966), and generate recursive one- to four-steps-ahead forecasts for the period of 1967 through 2000. These forecasts are compared to forecasts from an unrestricted vector autoregression, a reduced rank regression model, an index model and a cointegration-based error correction model. The error correction model that takes into account both nonstationarity of the data and rank reduction performs best at all four forecasting horizons. However, differences among competing models are statistically insignificant in most cases. No model consistently encompasses the others at all four horizons.