Gump  Brooks B.; Reihman  Jacki; Stewart  Paul; Lonky  Ed; Darvill  Tom 《Canadian Metallurgical Quarterly》2005,24(6):594

A number of studies have considered whether background stress affects cardiovascular responses to acute stress tasks. The present study considers the effect of a potent background stressor with a clear onset, namely the terrorist attacks on September 11, 2001. Specifically, the authors investigated differences among 9.5-year-old children tested before (N = 30) and then following (N = 20) the 9/11 attacks. In addition, a majority of these children (N = 37) were retested approximately 1 year later (i.e., before and after 9/11/2002). Children tested directly following 9/11/2001 exhibited significantly greater stroke volume and cardiac output responses to acute stress tasks compared with their responses 1 year later, and this change in reactivity differed significantly from the change in reactivity exhibited by children tested before 9/11/2001 and again 1 year later. These results suggest that a potent background stressor can temporarily heighten some children's cardiovascular responses to subsequent acute stressors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

  总被引：2，自引：0，他引：2  

Tom Broekel  Matté Hartog 《Industry and innovation》2013,20(3):277-295

A key question raised in recent years is what factors determine the structure of inter-organizational networks. Most research so far has focused on different forms of proximity between organizations, namely geographical, cognitive, social, institutional and organizational proximity, which are all factors at the dyad level. However, recently, factors at the node and structural network levels have been highlighted as well. To identify the relative importance of factors at these three different levels for the structure of inter-organizational networks that are observable at only one point in time, we propose the use of exponential random graph models. Their usefulness is exemplified by an analysis of the structure of the knowledge network in the Dutch aviation industry in 2008, for which we find factors at all different levels to matter. Out of different forms of proximity, only institutional and geographical proximity remains significant once we account for factors at the node and structural levels.  相似文献   

    

Pavel Šolín  Tomáš Vejchodský 《International journal for numerical methods in engineering》2008,73(10):1374-1394

We present a new class of higher‐order finite elements based on generalized eigenfunctions of the Laplace operator, which are suitable for both product and simplicial geometries in ?^d. Due to simultaneous orthogonality of the generalized eigenfunctions under both the H and L² products and their almost negligible dependence on reference maps, such finite elements are an excellent choice for the discretization of second‐order elliptic problems by the hp‐FEM. Analysis is illustrated by numerical results and comparisons with other popular higher‐order finite elements are presented. The new elements are used to compute efficiently the model of an electrostatic micromotor. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

    

Lu You  Chengliang Lu  Pan Yang  Guchang Han  Tom Wu  Ulrike Luders  Wilfrid Prellier  Kui Yao  Lang Chen  Junling Wang 《Advanced materials (Deerfield Beach, Fla.)》2010,22(44):4964-4968

  相似文献   

    

Andrew M. Collins  Nick J. V. Skaer  Tom Gheysens  David Knight  Caroline Bertram  Helmtrud I. Roach  Richard O. C. Oreffo  Sonja Von‐Aulock  Teodora Baris  John Skinner  Stephen Mann 《Advanced materials (Deerfield Beach, Fla.)》2009,21(1):75-78

  相似文献   

    

Bianca C. de Brito  Edsger C. P. Smits  Paul A. van Hal  Tom C. T. Geuns  Bert de Boer  Clemens J. M. Lasance  Henrique L. Gomes  Dago M. de Leeuw 《Advanced materials (Deerfield Beach, Fla.)》2008,20(19):3750-3753

  相似文献   

    

Stefan J. Grimberg  Tom A. Langen  Larry D. Compeau  Susan E. Powers 《工程教育杂志》2008,97(1):95-103

We analyzed seven years of pre‐program and post‐program survey data to evaluate the Clarkson University Research Experience for Undergraduates (REU) Site Program in Environmental Science and Engineering, and evaluated whether our program was successful at meeting the intended outcome of increasing participants' likelihood of attending graduate school and pursuing a career in science or engineering research or education. We also evaluated how participant satisfaction in the program changed with the addition of a weekly seminar on environmental sustainability that was intended to improve participants' understanding of the societal value of their research projects. Participant satisfaction in the Clarkson REU Program was high, and increased after the addition of the sustainability seminar. Participants' intention to attend graduate or professional school increased after participating in the program, but their intention to pursue a career in science or engineering research declined. Over 60 percent of participants eventually attended graduate or professional school.  相似文献   

    

D Tománek  Z Sun  SG Louie 《Canadian Metallurgical Quarterly》1991,43(6):4699-4713

  相似文献   

    

Ronald G. McGarvey  Enrique Del Castillo  Tom M. Cavalier  E. Amine Lehtihet 《Quality and Reliability Engineering International》2002,18(5):395-402

Sequential tolerance control (STC) is a tolerance control methodology used in discrete parts manufacturing. Recently, an adaptive sphere‐fitting method for STC (ASF–STC) was developed to account for potential skewness in manufacturing operations' distributions, a factor not considered in conventional STC. ASF–STC offers significant improvements over conventional STC when such skewness exists. The direction of skewness of an operations' distribution is a necessary input to ASF–STC. Thus, a novel approach to determining the skewness of a distribution for small sample sizes is presented here. ASF–STC has an additional requirement of distribution information for each operation. The beta distribution is an ideal candidate here, as it is very flexible in shape. The literature on four‐parameter beta estimation is very limited, and their performance for small sample sizes is poor. STC was designed for low‐volume production, thus the estimation for small sample sizes is necessary here. This study presents a heuristic, based on the method of moments estimates for a beta distribution, that estimates the four parameters for a beta distribution with small sample size. Several computational results are provided to compare this heuristic to the best‐known procedure, with the heuristic found to perform better for the test problems considered. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

    

Shuang Hou  Haichao Zhao  Libo Zhao  Qinglin Shen  Kevin S. Wei  Daniel Y. Suh  Aiko Nakao  Mitch A. Garcia  Min Song  Tom Lee  Bin Xiong  Shyh‐Chyang Luo  Hsian‐Rong Tseng  Hsiao‐hua Yu 《Advanced materials (Deerfield Beach, Fla.)》2013,25(11):1514-1514

  相似文献