新疆撒拉族历史迁徙与文化变迁研究

文章通过梳理相关历史文献并结合田野调查资料,描绘了新疆撒拉族的历史渊源和形成的历史过程;新疆撒拉族在迁徙的历史进程中,为了立足新的环境与周边民族文化进行了长期的互动、积极调适,社会文化发生了积极的变迁.     

A Review and Analysis of Selected School Climate Measures

Although it is widely agreed that there is no universally accepted definition for school climate, most professionals ground it in shared beliefs, values, and attitudes reflecting the quality and character of life in schools. In this article, we review and analyze measures accessible to school personnel charged with documenting and monitoring school climate. We document core features of four scientifically sound and comprehensive measures of school climate. We believe our work serves as a selective consumer's guide for school personnel engaged in important levels of decision-making related to monitoring and improving the quality and character of interactions that represent academic and behavior standards in schools.     

Bouncing off the Paywall – Understanding Misalignments Between Local Newspaper Value Propositions and Audience Responses

ABSTRACT

Declining advertising revenue and print copy sales have propelled extensive paywall experiments in local newspapers to generate new revenue and fund local journalism. The success of these experiments is ultimately depending on whether or not they deliver the value that customers require. This article studies local newspapers’ potential to build successful paywalls by conducting a two-sided analysis of paywall value propositions and local news audiences’ responses to these value propositions. Drawing on mixed methods – in-depth interviews with 20 newspaper managers and a national survey (N = 1586) among local newspaper audiences – our study identifies a major gap between intended value of paywalls and customer value perception and behavior. These are misalignments between the intended attractiveness of paywalled content and audience attitude toward this content, and misalignments between access to paywalled content and use. Local newspapers’ offerings are particularly misaligned with younger, lower income and lower news interest customers. When these groups hit a paywall, they most likely bounce off.     

Micromixing visualization and quantification in a microscale multi-inlet vortex nanoprecipitation reactor using confocal-based reactive micro laser-induced fluorescence

A technique for visualizing and quantifying reactive mixing for laminar and turbulent flow in a microscale chemical reactor using confocal-based microscopic laser induced fluorescence (confocal μ-LIF) was demonstrated in a microscale multi-inlet vortex nanoprecipitation reactor. Unlike passive scalar μ-LIF, the reactive μ-LIF technique is able to visualize and quantify micromixing effects. The confocal imaging results indicated that the flow in the reactor was laminar and steady for inlet Reynolds numbers of 10, 53, and 93. Mixing and reaction were incomplete at each of these Reynolds numbers. The results also suggested that although mixing by diffusion was enhanced near the midplane of the reactor at Re_j = 53 and 93 due to very thin bands of acidic and basic fluid forming as the fluid spiraled towards the center of the reactor, near the top, and bottom walls of the reactor, the lower velocities due to fluid friction with the walls hindered the formation of these thin bands, and, thus, resulted in large regions of unmixed and unreacted fluid. At Re_j = 240, the flow was turbulent and unsteady. The mixing and reaction processes were still found to be incomplete even at this highest Reynolds number. At the reactor midplane, the flow images at Re_j = 240 showed unmixed base fluid near the center of the reactor, suggesting that just as in the Re_j = 53 and 93 cases, lower velocities near the top and bottom walls of the reactor hinder the mixing and rection of the acidic and basic streams. Ensemble averages of line-scan profiles for the Re_j = 240 were then calculated to provide statistical quantification of the microscale mixing in the reactor. These results further demonstrate that even at this highest Reynolds number investigated, mixing and reaction are incomplete. Visualization and quantification of micromixing using this reactive μ-LIF technique can prove useful in the validation of computational fluid dynamics models of micromixing within microscale chemical reactors.     

Aztec Middle College: High School Alternatives in Community Colleges

The traditional high school model derived from the factory deficit model of the early 1900s has left many students, mainly minorities and/or low socioeconomic students, disenfranchised. This is evident in the poor school performance and high dropout rates of such students. Whereas the factory deficit model was created to promote only a few high school students to college, the rest of the students were trained for factory jobs. Today's job market requires that high school students go to college subsequent to their graduation. For this reason, middle college alternatives to traditional high schools are being adopted. Although research on middle colleges is limited due to their recent development, the results are encouraging: high school students who would otherwise have failed school or dropped out have high attendance rates and high graduation rates.     

Behavioral and relational correlates of low self-perceived competence in young children

It is developmentally normative for preschoolers (aged four to five years) to have self-perceptions that are typically positive and even over-inflated. However, because not all children have positive self-perceptions in early childhood it is important to understand factors that influence the development of self-perceptions, especially low self-perceptions, in early childhood. Therefore, this study examined the associations between self-perceptions and teacher ratings of social behaviors, subtypes of withdrawal, and peer ratings of acceptance/rejection in preschoolers. Participants included 199 children (107 males, 92 females) attending two early childhood programs in a midsized community in the western United States. The major findings were that children in early childhood who have lower self-perceptions of their abilities than their peers tended to engage in more reticence, solitary-passive withdrawal, and solitary-active behavior.