中国经济结构出现四大变化

China's economic structure has experienced majorchanges in recent years, and the changes can be summarizedin four facets: 1. Growth of consumption has entered a phase of steady expansion. Judging from the mix of demand in economic growth, the proactive fiscal policy and moderate     

经贸要闻

1. China's Economic Development and Metal Working Machine Tool Market In 2003, the Chinese government is constantly implementing the policy of expanding domestic demands, practicing active financial policies and stabilizing monetary policies. In the meantime the government has issued RMB 140 billion yuan long-term state treasury bonds to enlarge the scale of investment in fixed assets. Despite the economic growth is slow-down and lack of power to speed the economic growth up in the globe as well as impacted by SRAS     

今年中国GDP可望增长7.8%(英文)

China's GDP this year is expected to increase about 7. 8?cording to a report released by the Academy of Social Sci-ences on the analysis and forecast of the economic situation. Based on the combination of model simulation and analy-sis of evidence the forecast predicts that without the interna-tional economic environment worsening, China's GDP growth in     

China——the market with the biggest potential in the 21st century

The year 2001 was not an optimistic one for the worldeconomy.The United States and Japan,which were describedas the power engine of the world economy,suffered from adecline in economic growth,which led to the slow-down ofthe global economic development.Against this background,the Chinese economy,however,maintained sustainable and     

2004年秋季报告预测2004—2005两年经济发展

The China Economic Situation Analysis and Forecast project group of the Academy of Social Sciences of China has issued the 2004 Autumn Report, making a new forecast and analysis of China's national economic development in 2004-2005.The report forecast that GDP growth will be higher than 2003 and hit about 9.4% in 2004,and will solw down a bit in 2005 to more than 8%.     

中国60％高端塑料机械需进口

Statistics indicate that China＇s plastic-manufacturing industry has presented an annual growth of about 30% in recent years, and the industry is now capable of producing various types of plastic machinery, with annual production capacity of about 200,000 products,ranking first in the world. At the same time, the development speed of plastic machinery products and its major economic indices are placed first among the 194 sectors of the machine-building industry.     

中国经济发展与CIMT2005

Since the beginning of this year, China has reinforced macroeconomic control measures to curb the fast growing fixed asset investment, to slow down the overheating economy. The policies and measures for macroeconomic adjust and control have been taken and worked. The overly rapid increase of investment has been held back, the growth rate of money supply and credit declined, the prices of productive resources dropped while destabilizing and unhealthy factors in economic operations checked. The fixed asset invest-     

Beijing University of Chemical Technology Succeed in Technology of Tri-screw Extruder

The plastic machinery and Engineering Institute of Beijing University of Chemical Technology has successfully developed the world＇s first industrial full initiative meshed tri-screw extruder which is triangle arranged. The actual application of the industrial model shows that the tri-screw extruder is reliance for operating with low energy consumption and it shows a strong technological and economic advantages in the stronger mixing. The advantages is that：     

中国“十一五”规划的主要指标和新提法

China＇s newly released 11th Five-Year Plan delivered to the Fouth Session of the 10th National People＇s Congress for examination puts forward two important targets for national economic and social development in the 2006-2010 period： an average annual GDP growth of 7.5% and a reduction of about 20% in energy consumption for unit GDP and a reduction of 10% in main pollutants discharge volume. These are put forward in response to growing resource and environmental pressures and are indicative policy guidance.     

外资企业增加在华投资规避风险

Bosch Group of Germany recently kicked off a wind turbine gear installation production base in Beijing with an investment of 100 million euros, the first such installation base ever constructed outside Germany by Bosch, and the company announced it would increase its investment in China by 850 million euros in 2008-2010. Research data show that the global sales volume of Bosch Group will reach 47 billion euros in 2008, and its sales volume in China will reach 2.3 billion euros, up 30% from 2007. China will remain the major driving force behind sales growth of Bosch Group on the Asian market.     

ICP-AES法测定碳钢、低合金钢中13种元素

本文选择了硝酸、王水、逆王水,进行碳钢、低合金钢溶样条件试验,以谱线强度为指标,溶解酸种类、溶解酸浓度、溶解酸用量、定容酸用量等四因素为变化条件,各因素中有三水平,即按正交实验表L_9(3~4)进行试验,编制计算程序,快速、科学地优选出最佳溶样条件—30ml NHO_3(1+5v/v)和3ml HCl,ICP-AES法同时测定铝、砷、铬、钴、铜、磷、锰、钼、镍、硅、锡、钛和钒13种元素。为确定测试方法的重复性(r)和再现性(R)而进行精密度试验。精密度数据是由10个实验室对7个样品作试验确定的。方法的回收率为94％-105％。精密度在8％以内。     

ICP-AES法测定GH3128合金中硅、锰、钨、钼、铬、钛、铝、铁和锆等元素

采用ICP-AES法测定GH3128合金中硅、锰、钨、钼、铬、钛、铝、铁、锆等多种合金元素。系统研究了各元素4条分析谱线的光谱干扰情况,根据光谱干扰研究结果和分析谱线的灵敏度、信背比以及等效离子浓度等进行了分析线的选择。采用柠檬酸络合钨,基体匹配法消除共存元素干扰,效果良好。     

多领域优化设计中耦合因素的一种协调方法

由多领域组成的大系统协同优化设计中 ,主要存在两类耦合因素 :一是多个领域都需要对其进行优化设计的变量 ,即系统变量或交叉变量 ;二是某个领域计算的结果作为另一个领域的输入 ,即相关变量或耦合变量。这些耦合因素的存在 ,导致整个系统求解的过程出现混乱和无序。本文根据二级求解技术 ,通过引入一些辅助变量 ,提出一种处理这些耦合因素的方法 ,并给出一个简单算例阐述方法的实现     

Mott factors of P,V, Fe,Ga, As,Pd, In,Ta, and W for 500–3000 eV electrons

Mott scattering factors are needed for the quantitative interpretation of elastic scattering phenomena in electron spectroscopy and microscopy. The inelastic mean free path of electrons has been deduced from the elastic peak intensity. The theoretical approach is based on the effective elastic cross section derived from the differential elastic cross sections. In the present work they are calculated using the partial wave expansion method, supplying as well the Mott scattering factors. Tabulated data are presented for a number of elements and 500–3000 eV electrons in steps of 2° or 5° of the scattering angle θ. The effective and total elastic scattering cross sections are also presented.     

土壤中铅铬铜铁锌锰钙的测定

报道使用全酸法消解土壤，并用同一消解液分剐测定土壤中的铅、铬、铜、铁、锌、锰、钙等金属元素。其中铅使用原子荧光光谱法测定，其他元素使用火焰原子吸收光谱法测定。方法准确、快速、简便，适用于环境土壤中多种元素的测定，结果满意。     

石油焦中Fe、Ni、V、Na、Si、Ti的ICP-AES测定

本文提出用ＩＣＰ－ＡＥＳ法直接测定石油焦中Ｆｅ、Ｎｉ、Ｖ、Ｎａ、Ｓｉ、Ｔｉ含量,该测试方法能满足我厂石油焦中金属元素的检测,测定结果的准确度和精密度均满足分析要求。     

HPLC Columns,Theory, Technology,and Practice

ABSTRACT

This paper presents some results of experimental research addressing the influence of different thermal insulation fillings on dynamic properties of industrial resistance temperature probes, based on a thin-film platinum resistance temperature detector. The experiments were carried out with four jacket thin-film resistance temperature probes, all having identical protection tube geometry, yet differing in the thermal insulation filling materials. Further, a comparison between transient response characteristics in water established experimentally and those based on simulations with electric–thermal analogy, is given. The results of these analyses can be applied to enhance the dynamic response of temperature measurement made by temperature probes in water.     

Metal-on-metal bearings surfaces: materials, manufacture, design, optimization, and alternatives

When first introduced, total hip replacements offered pain relief and improved mobility in elderly patients. The success of this procedure in terms of long-term durability and restoration of function has led to its use in younger, more active patients. This has resulted in a commensurate increase in patient expectation regarding longevity and the degree to which function and lifestyle is restored. The bearing surface is a key feature of the performance of replacement joints. It is generally accepted that excessive amounts of wear debris preclude their long-term survivorship and hence there is an ongoing requirement for bearing surfaces which minimize debris generation. The purpose of this paper is to review the factors which affect the performance of so-called metal-on-metal bearings, to compare their performance with that of the other commonly used contemporary alternatives, metal and ceramic articulating against highly cross-linked polyethylene, and ceramic-on-ceramic, and finally to consider the potential solutions offered by new developments such as ceramic-on-metal and coatings applied to metal-on-metal bearings.