Heat and mass transfer of a circular porous moist object located in a triangular shaped vented cavity

Heat and mass transfer of a circular-shaped porous moist object inside a two-dimensional triangle cavity is investigated by using finite element method.The porous object is considered to be a moist food sample,located in the middle of the cavity with inlet and outlet ports with different configurations of inlet/outlet ports.Convective drying performance is numerically assessed for different values of Reynolds numbers(between 50 and 250),dry air inlet temperature(between 40 and 80℃)and different locations of the port.It is observed that changing the port locations has significant impacts on the flow recirculaitons inside the triangular chamber while convective drying performance is highly affected.The moisture content reduces with longer time and for higher Reynolds number(Re)values.Case P4 where inlet and outlet ports are in the middle of the walls provides the most effective configuration in terms of convective drying performance while the worst case is seen for P1 case where inlet and outlet are closer to the corners of the chamber.There is a 192% difference between the moisture reduction of these two cases at Re=250,T=80℃ and t=120 min.

动压气体止推轴承间隙气动热特性分析

为掌握不同工作条件下箔片型动压气体轴承气动热特性规律,以箔片型动压气体止推轴承为研究对象,建立其变截面气膜间隙模型,引入粘性耗散项,通过数值仿真计算不同工作条件下气膜间隙的无量纲温度分布,并对轴承转速、进/出口压力、进/出口温度等参数对气膜温比的影响进行数值分析。结果表明,在进/出口压力同比变化工作条件下,气膜温比随进/出口压力增大而下降,随转速的增大而升高,随进/出口温度的升高而降低。

外贸业务管理系统的设计与开发

外贸管理系统是针对中小型进出口公司的业务情况而设计的一套集企业外贸业务、电脑网络科技、Internet技术、科学管理方法于一体的综合性外贸业务管理软件。它按照进出口实务的操作流程进行公司管理、业务数据管理、业务分析、统计查询等一系列的业务过程。本文主要介绍该系统的设计和实现过程,通过测试表明,系统的安装及实施均非常方便,并且具有易维护、成本低、速度快、定位准确等优点,还能有效解决外贸业务中单据混杂的情况。

Status quo and Enhancement of Competitiveness of Cut Flower Industry in China

The research reviewed status quo and problems of China＇s cut flowers and proposed countermeasures and suggestions in improving its competitiveness in order to provide theoretical references for its development.

污水处理曝气鼓风机控制系统设计

离心式曝气鼓风机控制系统是污水处理工艺最重要的组成部分,其控制水平的高低直接关系到整个污水处理厂的经济、合理运行。本文以某型曝气鼓风机为例,从软件、硬件设计及控制原理上对系统进行详细的说明,从曝气流量精确控制和设备安全、稳定运行两方面着手,重点阐述系统所具备的功能特点和设计思路。

Sources and Flows of Embodied CO_2 Emissions in Import and Export Trade of China

This paper uses the Global Trade Analysis Project(version 7)database to calculate embodied CO2emissions in bilateral trade between China and other countries(regions)based on input-output methods.The sources and flows of embodied CO2emissions in import and export trade of China are analyzed.Results show that the flows of embodied CO2emissions in export trade are highly concentrated.The main flows to the United States(US)and Japan account for 1/4 and 1/7 of the total CO2emissions in export trade,respectively.Concentrated flows of total exports and small differences in export structure are the main reasons for the highly concentrated export trade.The sources of embodied CO2emissions in import trade have relatively low concentration.Taiwan Province of China,Hong Kong Special Administrative Region of China,US,Russia,Republic of Korea,and Japan account for around 7.72%–12.67%of the total embodied CO2emissions in import trade.The relative dispersion of import sources,the impact of the import structure,and the level of production technology in importing countries caused low concentration of CO2emissions in import trade.Overall,the embodied CO2emissions in the export trade of China are higher than those in import trade.As a result,production-based CO2emissions are higher than consumption-based CO2emissions.The difference of 8.96×108t of CO2,which comes mainly from the US,Japan,Germany,and the United Kingdom,accounts for 58.70%of the total difference.Some suggestions,such as improving energy efficiency,alerting high carbon-intensive industries transfer,expanding the market for sharing risks,and prompting the accounting system of consumption-based CO2emissions,are proposed based on the results.

Empirical Research on Correlation of Foreign Trade and Economic Growth --Taking Shanghai as an Example

Based on the statistical data of Shanghai, the paper makes empirical research on the relationship between foreign trade and economic growth. The research results indicate that there is long-term dynamic and equilibrium relationship between foreign trade and economic growth, and the economic growth is the Granger cause of trade import. Since 1979, rapid growth of economy motivates the expansion of trade import, but the pulling effect of import on economic growth is not evident. In addition, trade import promotes economic growth in the long run. But we can see that from the economic data in Shanghai that the promotion has not become the source motivate force of growth for trade expert.

New Convenient Way for Deriving Exponential Operators' Disentangling Formulas and Their Applications(Ⅱ)

In the preceding paper [Commun. Theor. Phys. 51 （2009） 321] we have recommended a convenient method for disentangling exponential operators in the form of exp{B ＋ C}, trying to find an operator A that satisfies [A, B] = C, and [A, [A, B]] = 0, then from the Baker-Hausdorff formula we have exp{B ＋C} ： exp（B ＋ [A, B]} = e^A e^B e^-A. After arranging e^Ae^B = e^B e^A e^W, the disentangling exp{B ＋ C} = e^B e^W is obtained. In this work we use this method to two-mode case, especially, derive the normal ordering form of exp[h（a^＋a ＋ b^＋b） ＋ ga^＋b^＋ ＋ kab] without appealing to Lie algebra method.

New Convenient Way for Deriving Exponential Operators' Disentangling Formulas and Their Applications

We recommend a new convenient method for disentangling some exponential operators and derive a set of new operator identities. Especially, we derive the normal odering form of exp [fa^＋a ＋ ga^2＋ ＋ ka^2] without appealing to Lie algebra method. Application of these formulas in solving some dynamic Hamiltonian is presented.

Sino-European Trade Competition in Latin America and the Caribbean

The article studies trade in goods between China and the Latin American and Caribbean （LAC） countries and between the European Union （EU） and LAC during the years from 2000 to 2013. From the beginning of the 21st century, big changes in LAC＇s trade patterns have been observed. The article contains possible explanation of them. The analysis is based on the ECLAC （Economic Commission for Latin America and the Caribbean） data. Merchandise trade between China and LAC grew significantly over the period from 2000 to 2013. In 2013, the value of merchandise exports from China was higher than from the EU-28 in the case of 12 LAC countries. Chinese imports of goods surpassed the European ones in five countries in the region. In order to increase its exports of manufactured goods and imports of natural resources and agricultural commodities, China combines trade arrangements with foreign aid policy. Besides, a rapid development of bilateral diplomatic ties between China and LAC is observed. The EU-LAC trade relations have worsened during the last decade mainly due to financial crisis and development of the EU-Asia trade relations.

Recent Experience of the Effects of Intervention on Exchange Rates

Recently, foreign exchange rates have been highly volatile all over the world. This article reports on an empirical examination of the effectiveness of foreign exchange market intervention in Tokyo foreign exchange market. In Japan, intervention in the foreign exchange market has occurred frequently and largely. In 2010, exchange rates fluctuated greatly, and the Japanese yen appreciated greatly against other foreign currencies. The Bank of Japan （BOJ） conducted an intervention in the foreign exchange market and bought massive USD to weaken the yen. They are expected to prevent too much appreciation of the yen, to promote export, and expansion of the economy. Recent foreign exchange market intervention in Tokyo has been effective in preventing the Japanese yen from appreciating against other currencies. Also, unsterilization has had a positive effect on depreciation of the yen. Moreover, news announcements by the Bank of Japan （BOJ） has led to depreciation of the yen. Effective announcements would increase the effects on markets. Sterilization in intervention and market communication are both taken into account in this article. The BOJ＇s news announcements seem to convey to markets adequately and communication between the bank and markets functions well. Moreover, the past exchange rate （i.e., the signaling effect） also is important to the movement of exchange rates. On the other hand, portfolio channel is not found

Some Remarks on Exp-Function Method and Its Applications

Recently, many important nonlinear partial differential equations arising in the applied physical and mathematical sciences have been tackled by a popular approach, the so-called Exp-function method. In this paper, we present some shortcomings of this method by analyzing the results of recently published papers. We also discuss the possible improvement of the effectiveness of the method.

Research on Macro Quality Evaluation to Import and Export Cargoes

Based on the quality inspection data of the import and the export cargos, the general quality evaluation index and quality index are built according to the percent of defective. Macro quality of the import and the export cargoes are discussed in theory.

An Empirical Study on the Relationship Between China's Maize Price and Maize Import and Export Trade

Based on the time series of China’s maize trade and domestic maize price,the article analyzes the relationship between domestic maize price and China’s maize international trade by using empirical methods.The results show that there is a connection between domestic maize prices and China's maize international trade,but the link is not very close.Domestic maize price is the cause of China’s maize international trade change,but its impact is very limited;China's maize international trade also can make some difference on the domestic maize price.Based on the results of research,the article brings three suggestion and expectation to adjust China’s maize international trade and the cost control reasonably in order to stabilize domestic maize price and maize yield,and to protect domestic grain security.

Zhe jiang Alephan Group Co.,LTD

Established in 1992,Zhejiang Alephan Group Co.,LTD is located in the world famous tourism city-Hangzhou,China,is a large-scale group company,consists of garments and textile manufacture and import & export,restaurant,entertainment,tourism enterprises,arts crafts, agricultural products processing,biologic and ecological R&D etc.

Aviation

Aviation Industry Sub-council,a branch of China Council for the Promotion of International Trade(CCPIT),fulfils its mission under the guidance of CCPIT.Aimed at pro- noting export and import of aviation and

Grain Business

CCPIT Grain Business Sub-Council was found in 1996,and has been continu- ous making efforts on promoting grain business international communication and exchanges,and trade in imports and exports.As China is a

Analysis on China’s Petroleum Imports and Exports in 1st Half of 2005

In the first half of 2005. the import of erude oil increased 4% up of the same period, but the net import of petroleum products including crude oil, oil products, liquefied petroleum gas （LPG） and others declined 7% of the same period last year. As the oil price in international market continuously climbs up and creates new records,

RMB Appreciation, Corporate Behavior and Export Trade：

This paper sets up a simplified dynamic discrete selection model to analyze two-stage decision of corporate export behavior and influence of exchange rate under the framework of profit maximization. Then we adopt Heckman selection model to estimate general effects and structural effects of RMB appreciation on export based on the sample data of China Industrial Enterprises from 2005 to 2009. Findings reveal that RMB appreciation has exerted a significant negative impact to corporate export through extensive margins and intensive margins. Meanwhile, due to different corporate strategies of heterogeneous enterprises, RMB appreciation cannot achieve the expected effect of ＂survival of the fittest＂ and is instead unfavorable to the optimization of export structure. RMB appreciatiou drives industry structure of export to evolve towards advanced levels to a certain extent. However, such a positive effect mainly derives from the contribution of foreign-funded enterprises while restricting development space of indigenous firms in the sector of advanced manufacturing.

Oil Import and Export in China

Domestic economic growth slowed down and supply exceeded demand in oil market in 2015, so the growth of refineries＂ processing volume was limited. Nevertheless, the gradual decontrol of market and the storage requirement under low oil price, crude oil imports hit a record high of 335.5 million tons, with the growth rate approximating 9%. Refined oil exports soared and imports decreased, which made China become a net refined oil exporter for the first time for 24 years, and net imports reached 6.22 million tons. Robust requirement on chemical raw materials propelled imported liquefied petroleum gas market to go on expanding. Imports exceeded 12 ,zillion tons in 2015, thus China leaped into the world＇s largest liquefied petroleum gas importer. In 2016, oil consumption growth would be kept at lower level. However, China would further decontrol crude oil import and refined oil export permits and put incremental storage capacity, into use. Therefore, crude oil imports would continue to rise up, and refined oil exports may hit a new historic high. hnported liquefied petroleum gas market will enter into a stage of stable growth after two years rapid development.