Non-enzymatic browning kinetics analysed through water–solids interactions and water mobility in dehydrated potato

Non-enzymatic browning (NEB) development was studied in dehydrated potato at 70 °C. It was related to the macroscopic and molecular properties and to water–solid interactions over a wide range of water activities. Time resolved ¹H NMR, thermal transitions and water sorption isotherms were evaluated. Although non-enzymatic browning could be detected in the glassy state; colour development was higher in the supercooled state. The reaction rate increased up to a water content of 26 g/100 g of solids (a_w = 0.84) and then decreased at higher water contents, concomitantly with the increase of water proton mobility. The joint analyses of NEB kinetics, water sorption isotherm and proton relaxation behaviour made it evident that the point at which the reaction rate decreased, after a maximum value, could be related to the appearance of highly mobile water. The results obtained in this work indicate that the prediction of chemical reaction kinetics can be performed through the integrated analysis of water sorption, water and solids mobility and the physical state of the matrix.     

Early career psychologists' knowledge of credentialing in psychology.

Early career psychologists (ECPs) represent the future for the professional organizations in psychology. To build relationships with ECPs, these organizations must understand and be responsive to their needs. Therefore, the National Register of Health Service Providers in Psychology developed and distributed an Internet survey to ECPs in 2006 to assess interest in and awareness of membership and credentialing organizations in psychology. The 1,852 psychologists who completed the Internet survey indicated a lack of familiarity with credentialing organizations in psychology and their benefits. The authors discuss the role of membership and credentialing organizations in addressing the needs of ECPs and discuss possible reasons for the small number of credentialed ECPs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

一种适用于短沟道LDD MOSFET参数提取的改进方法

提出了一种适用于短沟道L DD MOSFET的改进型参数提取方法,通过对栅偏压范围细分后采用线性回归方法,提取偏压相关参数,保证了线性回归方法的精度和有效性,避免了对栅偏压范围的优化和误差考虑.提取出的参数用于已建立的深亚微米L DD MOSFET的I- V特性模型中,模拟与测试数据的吻合表明了该方法的实用性     

背面Ar~+轰击对n-MOSFET低频噪声的影响

研究了低能量背面Ar+轰击对n沟MOSFET低频噪声的影响 .用低能量 ( 5 5 0eV)的氩离子束轰击n沟MOSFET芯片的背面 ,能改善其饱和区和线性区的低频噪声频谱密度 .饱和区低频噪声的减小可用载流子迁移率模型解释 ,而线性区低频噪声的减小可用载流子数模型解释 ;其变化的原因可能与氩离子束背面轰击后反型层电子的有效迁移率、二氧化硅中的固定电荷密度以及硅 二氧化硅界面的界面态密度的变化有关.     

纤锌矿GaN低场电子迁移率解析模型

在GaAs低场电子迁移率解析模型的基础上得到了纤锌矿GaN低场电子迁移率的解析模型,该模型考虑了杂质浓度、温度和杂质补偿率对低场电子迁移率的影响.模拟结果和测量数据的比较表明该模型在10 16～10 2 0 cm-3的电子浓度、30～80 0K的温度和0～0 9的杂质补偿率范围内具有较好的一致性.该电子迁移率解析模型对于GaN器件的数值模拟和器件仿真设计具有很强的实用意义.     

应变Si_(1-x)Ge_x材料掺杂浓度的表征技术

在分析研究Si1 -xGex 材料多子迁移率模型的基础上,建立了Si1 -xGex 材料电阻率与其Ge组分、掺杂浓度及温度关系的曲线谱图.同时,通过对半导体材料掺杂浓度各种表征技术的分析和实验研究,提出了采用四探针法表征Si1 -xGex 材料掺杂浓度的技术.此表征技术与Si材料掺杂浓度的在线检测技术兼容,且更加简捷.此表征技术的可行性通过实验及对Si1 -xGex 材料样品掺杂浓度的理化分析得到了验证     

应变Si1-xGex材料掺杂浓度的表征技术

在分析研究Sil-xGex材料多子迁移率模型的基础上，建立了Sil-xGex材料电阻率与其Ge组分、掺杂浓度及温度关系的曲线谱图．同时，通过对半导体材料掺杂浓度各种表征技术的分析和实验研究，提出了采用四探针法表征Sil-xGex材料掺杂浓度的技术．此表征技术与Si材料掺杂浓度的在线检测技术兼容，且更加简捷．此表征技术的可行性通过实验及对Sil-xGex材料样品掺杂浓度的理化分析得到了验证．     

Crossing boundaries and borders: Regional science advances in migration modelling

In this article we survey common themes in recent migration research and comment on the actual and potential contribution of regional science to this literature. There has been a marked shift in research from internal to international migration. The two research programmes would benefit from a unified framework. Spatial and systemic features of migration systems remain underdeveloped. Moreover, the perspectives from the different disciplines that intersect in regional science can still be integrated better. Communication of the research findings in terms understood by policymakers and practitioners is also desirable. Finally, many new and interesting research topics will emerge when greater effort is made to link migration research with other current research topics in regional science.JEL Classification: F22, J11, O15, R23     

Control of Robotic Vehicles with Actively Articulated Suspensions in Rough Terrain

Future robotic vehicles will perform challenging tasks in rough terrain, such as planetary exploration and military missions. Rovers with actively articulated suspensions can improve rough-terrain mobility by repositioning their center of mass. This paper presents a method to control actively articulated suspensions to enhance rover tipover stability. A stability metric is defined using a quasi-static model, and optimized on-line. The method relies on estimation of wheel-terrain contact angles. An algorithm for estimating wheel-terrain contact angles from simple on-board sensors is developed. Simulation and experimental results are presented for the Jet Propulsion Laboratory Sample Return Rover that show the control method yields substantially improved stability in rough-terrain.