|
| ||
|
|
||
Broad Set (broad + set)
Selected AbstractsResidential Segregation Influences on the Likelihood of Ethnic Self-EmploymentENTREPRENEURSHIP THEORY AND PRACTICE, Issue 2 2009Gregory B. Fairchild Geographic and environmental influences on economic action have a long history in managerial research. This paper develops and estimates a model of the potential of a broad set of U.S. racial minority groups to enter self-employment based on individual-level, household-level, and metropolitan area-level factors. The model allows for an analysis of two distinct residential segregation processes on self-employment likelihood. Results indicate that clustering by race has group-specific influences, increasing the likelihood of self-employment for some groups and diminishing for others. Higher levels of racial exposure raise the likelihood of entrepreneurial careers for all groups, but especially for Blacks. [source] Using Comparative Frontiers to Explore World-Systems Analysis in International RelationsINTERNATIONAL STUDIES PERSPECTIVES, Issue 3 2001Thomas D. Hall This article presents one way to approach the case study versus theoretically driven approach to teaching comparative courses. The goal is to actively engage students in doing international studies, not simply reading about the work of others. The method derives a broad set of case studies from some theoretical approach. Students then conduct and present their own case studies. Students then use their own case studies and those examined by the class as a whole as vehicles for interrogating, critiquing, and extending that theoretical approach. These final exercises in theory-building are a significant part of this approach. The specific example presented here uses world-systems analysis as the vehicle for organizing comparative study of frontiers. However, this method could readily employ other theoretical models to examine other theoretical and/or empirical puzzles via specific case studies. [source] Simple Methodology for Heck Arylation at C-8 of Adenine NucleosidesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2008Pallavi Lagisetty Abstract A simple method for the arylation of 8-vinyladenine nucleoside derivatives is reported. With a broad set of aryl iodides and bromides, the reaction is catalyzed by the simple combination palladium acetate/tris(o -tolyl)phosphine/triethylamine [Pd(OAc)2/(o -tol)3P/Et3N]. As expected, aryl chlorides are more difficult coupling partners but some undergo reactions with more exotic catalysts. Although trans -olefins are the major products, minor amounts of cis -isomers are detected in some cases, and a post -arylation mechanism for their formation is proposed. Finally, by subtle catalyst modulation chemoselective N -arylation of the nucleoside can be achieved in the presence of the vinyl moiety. [source] Resource allocation to defence and growth are driven by different responses to generalist and specialist herbivory in an invasive plantJOURNAL OF ECOLOGY, Issue 5 2010Wei Huang Summary 1.,Invasive plants often have novel biotic interactions in their introduced ranges. These interactions, including less frequent herbivore attacks, may convey a competitive advantage over native plants. Invasive plants may vary in defence strategies (resistance vs. tolerance) or in response to the type of herbivore (generalists vs. specialists), but no study to date has examined this broad set of traits simultaneously. 2.,Here, we examined resistance and tolerance of Chinese tallow (Triadica sebifera) populations from the introduced and native ranges to generalist (Cnidocampa flavescens) and specialist herbivores (Gadirtha inexacta) in the native range. 3.,In a field common-garden test of resistance, caterpillars of each species were raised on plants from native and invasive populations. We found the specialist grew larger on and consumed more mass of invasive plant populations than native populations, while the generalist showed the same performance between them. The results were consistent with our laboratory bioassay using excised leaves. Chemical analyses showed that the invasive plants had lower tannin content and higher ratio of carbohydrate to protein than those of their native counterparts, suggesting that plants from invasive populations have altered chemistry that has a larger impact on specialist than on generalist resistance. 4.,To test for differences in herbivore tolerance, plants were first defoliated by specialist or generalist herbivory and then allowed to regrow for 100 days in a field common garden. We found that plants from invasive populations had greater herbivore tolerance than native populations, especially for tolerance to generalists. They also grew more rapidly than native counterparts in the absence of herbivory. 5.,Synthesis. The results of these experiments indicate that differences in selective pressures between ranges have caused dramatic reductions in resistance to specialist herbivores and those changes in plant secondary chemistry likely underlie these differences. The greater tolerance of invasive populations to herbivory appears to at least partly reflect an increase in growth rate in the introduced range. The greater tolerance to generalist herbivores suggests the intriguing possibility of selection for traits that allow plants to tolerate generalist herbivores more than specialist herbivores. [source] Environmental Impacts of Products: A Detailed Review of StudiesJOURNAL OF INDUSTRIAL ECOLOGY, Issue 3 2006Arnold Tukker Summary Environmental effects of economic activities are ultimately driven by consumption, via impacts of the production, use, and waste management phases of products and services ultimately consumed. Integrated product policy (IPP) addressing the life-cycle impacts of products forms an innovative new generation of environmental policy. Yet this policy requires insight into the final consumption expenditures and related products that have the greatest life-cycle environmental impacts. This review article brings together the conclusions of 11 studies that analyze the life-cycle impacts of total societal consumption and the relative importance of different final consumption categories. This review addresses in general studies that were included in the project Environmental Impacts of Products (EIPRO) of the European Union (EU), which form the basis of this special issue. Unlike most studies done in the past 25 years on similar topics, the studies reviewed here covered a broad set of environmental impacts beyond just energy use or carbon dioxide (CO2) emissions. The studies differed greatly in basic approach (extrapolating LCA data to impacts of consumption categories versus approaches based on environmentally extended input-output (EEIO) tables), geographical region, disaggregation of final demand, data inventory used, and method of impact assessment. Nevertheless, across all studies a limited number of priorities emerged. The three main priorities, housing, transport, and food, are responsible for 70% of the environmental impacts in most categories, although covering only 55% of the final expenditure in the 25 countries that currently make up the EU. At a more detailed level, priorities are car and most probably air travel within transport, meat and dairy within food, and building structures, heating, and (electrical) energy-using products within housing. Expenditures on clothing, communication, health care, and education are considerably less important. Given the very different approaches followed in each of the sources reviewed, this result hence must be regarded as extremely robust. Recommendations are given to harmonize and improve the methodological approaches of such analyses, for instance, with regard to modeling of imports, inclusion of capital goods, and making an explicit distinction between household and government expenditure. [source] Since we seem to agree, why are the outcomes so difficult to achieve?NEW DIRECTIONS FOR TEACHING & LEARNING, Issue 121 2010Terry Rhodes There is mounting evidence from faculty and employers that a broad set of skills and abilities are essential for student success as graduates, citizens, and employees. The traditional approach to general education with an emphasis on exposure to a menu of knowledge no longer suffices. Graduates need to be able to integrate their learning, apply it in real-world settings, and use it to address complex and unscripted problems. Examining the emergent research on student learning and key factors that deepen and enhance learning in essential areas for all students at our institutions leads us to developing new modes of measuring and assessing for learning among our students. One such new approach, the VALUE project, using rubrics and portfolios of student work, is described and discussed as a way to engage students in assessing their own leaning, while giving faculty useful information, and institutions reportable results for accountability. [source] Neighbors Matter: Causal Community Effects and Stock Market ParticipationTHE JOURNAL OF FINANCE, Issue 3 2008JEFFREY R. BROWN ABSTRACT This paper establishes a causal relation between an individual's decision whether to own stocks and average stock market participation of the individual's community. We instrument for the average ownership of an individual's community with lagged average ownership of the states in which one's nonnative neighbors were born. Combining this instrumental variables approach with controls for individual and community fixed effects, a broad set of time-varying individual and community controls, and state-year effects rules out alternative explanations. To further establish that word-of-mouth communication drives this causal effect, we show that the results are stronger in more sociable communities. [source] Theme-based tests: Teaching in contextBIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION, Issue 1 2005Gretchen L. Anderson Abstract Theme-based tests provide an assessment tool that instructs as well by providing a single general context for a broad set of biochemical concepts. A single story line connects the questions on the tests and models applications of scientific principles and biochemical knowledge in an extended scenario. Theme-based tests are based on a set of interrelated journal articles or a fictional story derived from popular culture or local events that interweaves biochemical principles into a story line. Theme-based tests engage students during an exam and promote their creativity. [source] Toward a Framework for Achieving a Sustainable GlobalizationBUSINESS AND SOCIETY REVIEW, Issue 3 2010JOHN F. PREBLE ABSTRACT Widespread trade liberalization and economic integration characterize the current era of globalization. While this approach has resulted in significant job creation, improved living standards, and a wider variety of cheaper consumer goods and services, opponents question if globalization's benefits outweigh the dislocations and downsides that it causes. Protestors are intent on stalling or rolling back globalization's progression and our review of the history of globalization reveals that a backlash is not without precedent. The article carefully examines the myth and reality of these two opposing positions on four key areas of the globalization debate: jobs; inequality and poverty; national sovereignty and cultural diversity; and the natural environment. This information is then utilized to derive a broad set of feasible policy recommendations that could help bring about a more sustainable form of globalization. [source] Modulation of Spectrokinetic Properties of o -Quinonoid Reactive Intermediates by Electronic Factors: Time-Resolved Laser Flash and Steady-State Photolysis Investigations of Photochromic 6- and 7-ArylchromenesCHEMISTRY - A EUROPEAN JOURNAL, Issue 17 2009Jarugu, Narasimha Moorthy Prof. Abstract A variety of differently substituted 6- and 7-arylchromenes such as that depicted undergo photoinduced CO bond cleavage to yield colored o -quinonoid intermediates. A combined analysis of ,s,ms (laser flash) and real-time kinetic data show that the o -quinonoid intermediates decay faster when the C2-aryl and C6-/C7-aryl rings contain electron-donating and electron-accepting groups, respectively. Similarly, the decay occurs slowly for the reversed scenario, while intermediate decay rates are observed when both substituents are electron donating. A ready synthetic accessibility of a series of 6- and 7-arylchromenes via Pd0 -catalyzed Suzuki coupling protocol has permitted a comprehensive investigation of the thermal decay behavior of a broad set of photogenerated o -quinonoid reactive intermediates. It is shown that substantial mesomeric effect between the benzopyran nucleus and the aryl ring at C6 or C7 position of the former renders significant absorption beyond 350,nm such that they are readily photoactivated to yield colored o -quinonoid intermediates. The absorption spectra of the latter are found to be strongly influenced by the substituents on C2-, C6- and C7-aryl rings; indeed the colored absorptions can be conveniently tuned by appropriate choice of substituents. The thermal decay (bleaching phenomenon), which is important from the point of view of their application in ophthalmic lenses, was investigated in each case by ,s,ms as well as real-time absorption spectroscopy. By careful experimentation, we have extracted the decay rate constants for Z,E and E,E o -quinonoid isomers of all 6- and 7-arylchromenes in an attempt to establish a correlation between the electronic attributes with their thermokinetic behavior. From a combined analysis of ,s,ms (laser flash) and real-time kinetic data, it is shown that the colored o -quinonoid intermediates decay faster when the C2-aryl and C6-/C7-aryl rings contain electron-donating and electron-accepting groups, respectively. In the same vein, the decay was found to occur slowly for the reversed scenario, while intermediate decay rates are observed when both substituents are electron-donating. Thus, any substituent on the C2-aryl ring that contributes mesomerically to the development of charge on the quinonoid oxygen, and any substituent on the C6-/C7-aryl ring that exerts ,I effect appear to expedite thermal decay. Furthermore, evidence is obtained for the first time from ,s time-resolved laser-flash spectroscopy for the formation and characterization of the trans,cis (E,Z) o -quinonoid isomer, which has heretofore eluded spectral characterization in the photochromic phenomena of pyrans. [source] | ||||||||||||||||