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131.
The combination of photographs taken at two or three wavelengths at and bracketing an absorbance peak indicative of a particular compound can lead to an image with enhanced visualization of the compound. This procedure works best for compounds with absorbance bands that are narrow compared with "average" chromophores. If necessary, the photographs can be taken with different exposure times to ensure that sufficient light from the substrate is detected at all three wavelengths. The combination of images is readily performed if the images are obtained with a digital camera and are then processed using an image processing program. Best results are obtained if linear images at the peak maximum, at a slightly shorter wavelength, and at a slightly longer wavelength are used. However, acceptable results can also be obtained under many conditions if non-linear photographs are used or if only two wavelengths (one of which is at the peak maximum) are combined. These latter conditions are more achievable by many "mid-range" digital cameras. Wavelength selection can either be by controlling the illumination (e.g., by using an alternate light source) or by use of narrow bandpass filters. The technique is illustrated using blood as the target analyte, using bands of light centered at 395, 415, and 435 nm. The extension of the method to detection of blood by fluorescence quenching is also described. 相似文献
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While the concept of power has always been a concern to students of political science and public administration, it has been examined only peripherally in the last few years. Recent work by McClelland has indicated that power may be a very important variable in explaining managerial behavior and organizational effectiveness. Starting with a definition of power provided by McClelland, this paper develops a conceptual framework for analyzing power-related behavior in an organizational setting. The framework is then applied to a problem area of particular interest to the authors--the question of whether or not women managers can be expected to behave differently than their male counterparts because of possible differences in their orientations toward power. We conclude that differences in power needs will not impede the effectiveness of female managers, but women may be at a disadvantage in the work environment due to possible differences in the way they express these needs. 相似文献
135.
Frances S. Berry Ralph S. Brower Sang Ok Choi Wendy Xinfang Goa HeeSoun Jang Myungjung Kwon Jessica Word 《Public administration review》2004,64(5):539-552
This article identifies and describes the development of three parallel streams of literature about network theory and research: social network analysis, policy change and political science networks, and public management networks. Noting that these traditions have sometimes been inattentive to each other's work, the authors illustrate the similarities and differences in the underlying theoretical assumptions, types of research questions addressed, and research methods typically employed by the three traditions. The authors draw especially on the social network analysis (sociological) tradition to provide theoretical and research insights for those who focus primarily on public management networks. The article concludes with recommendations for advancing current scholarship on public management networks. 相似文献
136.
Patrick Renee B. Rote Wendy M. Gibbs John C. Basinger Karen S. 《Journal of youth and adolescence》2019,48(10):2051-2064
Journal of Youth and Adolescence - In bullying situations, adolescent bystanders may help bullied others, just stand by, or join in the antisocial behavior. Current studies have yet to fully... 相似文献
137.
The ability of authoritarian regimes to maintain power hinges, in part, on how well they are able to manipulate the flow of information to the masses. While authoritarian states have had success controlling traditional media, the growth of social media over the last decade has created new challenges for such regimes. The Russian experience offers an example of how an authoritarian regime responds to this potential threat. Because of the massive demonstrations surrounding the 2011–2012 Duma elections, the ruling Russian government suspected that social media provided a significant impetus for the demonstrations. Social media, through its dissemination of opposition blogs, could have helped drive negative attitudes about the governing party. As such, the government responded by employing strategies to tighten their grip on the digital flow of information. We use survey data to demonstrate that exposure to blogs via social media at the time of the demonstrations led many to believe that the elections were fraudulent. Ultimately, we contend that Russian fears concerning the importance of social media for the fomenting of opposition movements is well grounded. Social media can drive support for opposition in an autocratic state. 相似文献
138.
This article takes a case study approach to examine social justice-oriented environmental activism of faculty in the context of neoliberalism. As an evolving trend, university corporatization places new economic burdens on universities and their students and has contributed to a tenuous landscape for faculty in terms of academic freedom and job security. In particular, we examine a faculty-led response to hydraulic fracturing, or fracking, at the University of Northern Colorado in Greeley, Colorado. Drawing on participant observation, semi-structured interviews, and campus-wide survey data, we document this response as a “tempered grassroots leadership” approach to workplace inquiry and activism. We discuss both the opportunities and limitations of promoting more transparent, informed, and inclusive decision-making on campus via internal and tempered activism strategies. Ultimately, this case presents lessons learned regarding social change practices of teacher-scholar-activists on college campuses. These experiences are especially germane in the “Trump era” of top-down and socially regressive decision-making.
Abbreviations: IHE: Institutions of Higher Education, TGL: tempered grassroots leadership, UNCO: University of Northern Colorado, HFTF: Hydrofracturing Task Force, NAS: National Association of Scholars. 相似文献
139.
AbstractIt is customary to argue that foreign policy is very much dominated by the executive, with parliaments wielding limited influence. However, with the exception of the US Congress, legislative?executive relations in the realm of foreign and security policy have attracted remarkably little scholarly attention. Drawing on a principal?agent framework, this collection scrutinises the conventional wisdom of ‘executive autonomy’ in foreign affairs, indicating that even though parliaments have arguably become more involved in foreign and security policy over time, any notions of parliamentarisation need to be treated with caution. While expectations of consensus in the name of the national interest continue to play an important role in foreign policy decision-making, the papers highlight the role of party-political contestation structuring parliamentary debates and votes in this increasingly politicised issue area. This introductory paper introduces the analytical framework and hypotheses guiding the contributions in this collection, summarises their main findings and suggests avenues for future research. 相似文献
140.
Smetana Judith G. Yau Jenny Y. P. Rote Wendy M. 《Journal of youth and adolescence》2021,50(10):2096-2107
Journal of Youth and Adolescence - Although Chinese parents are seen as employing guilt and shame induction to socialize children’s culturally appropriate behavior, research has focused... 相似文献