Orifice plates in a shock tube

This note points out some interesting aspects of a recent study of the flow resulting from the use of area change near the diaphragm of a shock tube. (1) Earlier studies (2,3) have been directed toward the use of area change for increasing the available shock speed, and thus have considered geometries where A4/A1 > 1 and A*/A1 = 1 [see notation on Fig. 1(a)]. In the current work, shock tubes with arbitrary values of these parameters are considered over the complete range of Ms (the shock Mach number)

Processes on Unimodular Random Networks

We investigate unimodular random networks. Our motivations include their characterization via reversibility of an associated random walk and their similarities to unimodular quasi-transitive graphs. We extend various theorems concerning random walks, percolation, spanning forests, and amenability from the known context of unimodular quasi-transitive graphs to the more general context of unimodular random networks. We give properties of a trace associated to unimodular random networks with applications to stochastic comparison of continuous-time random walk.Comment: 66 pages; 3rd version corrects formula (4.4) -- the published version is incorrect --, as well as a minor error in the proof of Proposition 4.10; 4th version corrects proof of Proposition 7.1; 5th version corrects proof of Theorem 5.1; 6th version makes a few more minor correction

Exploring notions of genre in 'academic literacies' and 'writing across the curriculum': approaches across countries and contexts

The SIGET IV panel on genre in Writing Across the Curriculum (WAC) and “academic literacies” (ACLITS) has set rolling a discussion of the similarities and differences in the two traditions, the former originating in the US in the early 1970s, the latter originating in England in the early 1990s. This paper maps out some elements of each in relation to the other and to genre, which we hope will set in motion further discussions and cross-fertilization

Latino Acculturative Stress Implications, Psychotherapeutic Processes, and Group Therapy

The Latino population is the fastest growing ethnic minority group in the United States. Yet, Latinos do not receive adequate mental health treatment due to the lack of cultural sensitivity regarding the necessity of bilingual and bicultural staff and culturally modified therapies. The difficulties associated with Latinos wrestling to preserve their native culture while also adjusting to the new dominant U.S. culture may cause them to experience acculturative stress. This specific distress may lead Latinos to implement maladaptive coping strategies that could influence Latino risk factors regarding unemployment, poverty, alcohol and drug abuse, aggressive behavior, mental health issues, and suicide rates. After reviewing the research focused on Latinos, Motivational Interviewing, Cognitive Behavioral Therapy, and Interpersonal Therapy were three major orientations aimed at individual therapy with Latinos while Cognitive Behavioral Group Therapy and psychoeducational groups dominated group therapy literature with Latinos. This review concluded the importance of incorporating cultural values and addressing socio-psychological stressors in therapy in order to produce significant treatment efficacy. Nonetheless, the rapidly increasing Latino population and genuine lack of cultural awareness requires continued research on culturally modifying other treatment modalities, multicultural competency for mental health professionals, and graduate program incorporation of a language component to stimulate interest with this needy population

Explaining Home Bias in Consumption: The Role of Intermediate Input Trade

We show that 'home bias' in trade patterns will arise endogenously due to the co-location decisions of intermediate and final goods producers. Our model identifies four implications of home bias arising out of specialized industrial demands. Regions absorb different bundles of goods. Buyers and sellers of intermediate goods co-locate. Intermediate input trade is highly localized. The effect of spatial frictions on trade are magnified. These implications are examined and confirmed using a unique data source that matches the detailed subnational geography of shipments to the characteristics of the shipping establishments. Our results broaden the measurement and interpretation of home bias, and provide new evidence on the role of intermediate inputs in concentrating production.