The internal circulations on internal mass transfer rate of a single drop in nonlinear uniaxial extensional flow

The internal flow of a droplet in the nonlinear extensional flow field will exhibit more than two internal circulations with the variation of nonlinear intensity(E).In this paper,the effect of positions and sizes of internal circulations on internal mass transfer rate of a single spherical droplet in a nonlinear extensional flow field is studied and compared with that in a linear extensional flow field.The simulation results show that when E≥0,there are two symmetrical internal circulations in the droplet,which is the same with that in a linear extensional flow.The limit value of mass transfer rate Sh is 15,which is equal to that in a linear extensional flow,no matter how large E is.When E≤-3/7,the number of internal flow circulation of a droplet increase to four and the transfer rate Sh increases.When E=-1,the maximum internal transfer rate Sh equals 30 which is twice of that in a linear extensional flow.The generation of new flow circulations in droplets and the circulation positions will enhance mass transfer when E≤-3/7,which provides a new idea for enhancing the internal mass transfer rate of droplets.

Internal heat transfer coefficients in microporous media with rarefaction effects

The internal heat transfer of different gases in microporous media was investigated experimentally and numerically.The experimental test section had a sintered bronze porous media with average particle diameters from 11 μm to 225 μm.The Knudsen numbers at the average inlet and outlet pressures of each test section varied from 0.0006 to 0.13 with porosities from 0.16 to 0.38.The particle-to-fluid heat transfer coefficients of air,CO 2 and helium in the microporous media were determined experimentally.The results show that the Nusselt numbers for the internal heat transfer in the microporous media decrease with decreasing the particle diameter,d p,and increasing Knudsen number for the same Reynolds number.For Kn>0.01,the rarefaction affects the internal heat transfer in the microporous media.A Nusselt number correlation was developed that includes the influence of rarefaction.The computational fluid dynamics(CFD) numerical simulation was carried out to do the pore scale simulation of internal heat transfer in the microporous media considering the rarefaction effect.Pore scale three-dimensional numerical simulations were also used to predict the particle-to-fluid heat transfer coefficients.The numerical results without slip-flow and temperature jump effects for Kn<0.01 corresponded well with the experimental data.The numerical results with slip-flow and temperature jump effects for 0.01<Kn<0.13 are lower than the numerical results without rarefaction effects,but closer to the experimental data.The numerical results with rarefaction effects can accurately simulate the unsteady heat transfer in the microporous media.

Second Call for Papers 2009 International Symposium on Language Transfer in Second Language Acquisition

March 21-22,2009 Keynote Speakers Terence Odlin Ohio State University David Singleton The University of Dublin Scott Jarvis Ohio University Submissions which present research on any topic in the field of language transfer in second language acquisition will be fully considered, including: syntactic transfer; semantic transfer; conceptual transfer; phonological transfer; lexical transfer; pragmatic transfer; cultural transfer; constraints on transfer; other topics related to language transfer.Presentations will be 20 minutes long followed by a 10 minute question period.

International transferability of macro-level safety performance functions: a case study of the United States and Italy

Safety performance functions(SPFs),or crash-prediction models,have played an important role in identifying the factors contributing to crashes,predicting crash counts and identifying hotspots.Since a great deal of time and effort is needed to estimate an SPF,previous studies have sought to determine the transferability of particular SPFs;that is,the extent to which they can be applied to data from other regions.Although many efforts have been made to examine micro-level SPF transferability,few studies have focused on macro-level SPF transferability.There has been little transferability analysis of macro-level SPFs in the international context,especially between western countries.This study therefore evaluates the transferability of SPFs for several states in the USA(Illinois,Florida and Colorado)and for Italy.The SPFs were developed using data from counties in the United States and provincias in Italy,and the results revealed multiple common significant variables between the two countries.Transferability indexes were then calculated between the SPFs.These showed that the Italy SPFs for total crashes and bicycle crashes were transferable to US data after calibration factors were applied,whereas the US SPFs for total and bicycle crashes,with the exception of the Colorado SPF,could not be transferred to the Italian data.On the other hand,none of the pedestrian SPFs developed was transferable to other countries.This paper provides insights into the applicability of macro-level SPFs between the USA and Italy,and shows a good potential for international SPF transferability.Nevertheless,further investigation is needed of SPF transferability between a wider range of countries.

International Transfer Pricing——A Generalziation Based on Income Tax and Tariff Effects

In order to successfully compete in the global market,many multinationalcompanies use control and evaluation systems for monitoring the performanceof their subsidiaries abroad,which are faced with complexities of political,social,cultural,and legal differences,tax regulations,import and export re-strictions,foreign exchange regulations,control on the transfer of f unds,and various other restrictions imposed by host countries to protect their nation-al interests.The challenge for multinationals is to design a transfer strategywhich appropriately rewards the management of the subsidiaries overseas andalso copes with the various poli tical,legal,cultural,and economic restric-tions of the host countries.

The Development of China’s Electronics Industry: Causes and Constraints

The development of China’s electronics industry can be attributed to supportive governmentpolicies, strong domestic market demand and the opportunities provided by the internationaltransfer of technology in the electronic manufacturing sector. China’s enterprises can onlycontinue to develop through technological upgrading due to the lack of core technologiesof their own. Since this process is still ongoing, China has not become a competitive countryin the field of electronic technology. As a country in transition, government initiatives designedto encourage the development of the electronics industry have also undergone changes inline with economic institutional reform. Direct government intervention policies have beengradually replaced by indirect regulatory policies and the market is playing a more andmore important role in the electronics industry.