8,999 research outputs found
Addressing Problems in Evaluating Health-Relevant Programs through Systematic Planning and Evaluation
The authors argue that inconsistent terminology is often a hindrance in assessing health program implementation, effectiveness and efficiency. Attending closely to this, they propose a model scheme for conducting such evaluations
Demographic Change and the Structure of Wages: A Demand-Theoretic Analysis for Brazil
With rapidly declining fertility and increased longevity the age structure of the labor force in developing countries has changed rapidly. Changing relative supply of workers by age group, and by educational attainment, can have profound effects on labor costs. Their impacts on earnings have been heavily studied in the United States but have received little attention in Asia and Latin America, where supply shocks are at least as large and have often proceeded less evenly across the economy. We use data on 502 local Brazilian labor markets from Censuses 1970-2000 to examine the extent of substitution among demographic groups as relative supply has changed. The results suggest that age-education groups are imperfect substitutes, so that larger age-education cohorts see depressed wage rates, particularly among more-educated groups. The extent of substitution has increased over time, so that the decreasing size of the least-skilled labor force today is barely raising its remaining members' wages.
Morfologia comparada das gĂ´nadas de pentatomĂdeos de importância agrĂcola.
Os percevejos fitĂłfagos sĂŁo de grande importância agrĂcola e afetam a produtividade de algumas culturas. O presente trabalho teve como objetivo avaliar o sistema reprodutor desses percevejos, e fazer uma análise comparativa para constatar se pode haver distinções morfolĂłgicas intra e inter-especĂficas
Avaliação dos estágios de desenvolvimento gonodal de percevejos fitófagos (Heteroptera: Pentatomidae).
O objetivo deste trabalho Ă© avaliar o estádio de desenvolvimento das gĂ´nadas de diferentes espĂ©cies de percevejos fitĂłfagos, caracterizando seu perĂodo de diapausa.PĂ´ster - graduação
Family Welfare and the Great Recession
The analysis in this paper provides estimates of family welfare losses generated by wage and nonlabor income declines experienced across the Great Recession and by labor market constraints existing postrecession. Welfare losses are greater as families (both married and single) move up the income distribution. Total static welfare losses are estimated to amount to roughly $190 billion, comparing family welfare between 2007 and 2011
Determinação da diapausa pelo desenvolvimento gonadal em percevejos de importância agrĂcola.
A diapausa Ă© a suspensĂŁo do desenvolvimento do inseto devido a fatores biĂłticos e/ou abiĂłticos, que permitem ao inseto sobreviver em uma condição adversa. O objetivo do trabalho foi avaliar as estruturas reprodutivas de percevejos de importância agrĂcola da famĂlia Pentatomidae e identificar fĂŞmeas que estĂŁo no perĂodo de diapausa. As espĂ©cies avaliadas foram: Euschistus heros, Tibraca limbativentris e Oebalus ypsilongriseus, coletados na safra 2012/2013, no Estado de Goiás. As dissecações foram realizadas com o auxĂlio de um microscĂłpio estereoscĂłpio, placa de Petri com parafina para a fixação dos percevejos submersos em água destilada ou álcool 70%, que permite a visualização da estrutura reprodutiva. A diapausa foi caracterizada por fĂŞmeas com ovários imaturos e diferenciadas das fĂŞmeas no inĂcio da fase reprodutiva devido a presença de poucos ovĂłcitos. Foram observados ovários em duas situações distintas: imaturas ou maduras. As gĂ´nadas imaturas apresentaram uma estrutura afilada, caracterizadas pela ausĂŞncia de ovĂłcitos, esse padrĂŁo foi observado em todos os indivĂduos imaturos. As gĂ´nadas maduras foram subdivididas em dois grupos, fĂŞmeas no inĂcio ou em plena fase reprodutiva. As fĂŞmeas no inĂcio da atividade reprodutiva apresentaram ovĂłcitos localizados apenas na parte inferior dos ovarĂolos e as fĂŞmeas em plena atividade reprodutiva possuĂam aproximadamente 16 ovĂłcitos distribuĂdos em todo ovário, caracterizando um ovário completamente preenchido. 58% dos indivĂduos de T. limbativentris coletados no perĂodo de novembro/2012 (inicio de safra), 43% dos E. heros coletados em março/2013 (final de safra) e 67% dos indivĂduos de O. ypsilongriseus coletados em novembro/2013 (inicio de safra) possuĂam gĂ´nadas imaturas. Portanto, mais de 40% de fĂŞmeas com gĂ´nadas imaturas, indicam que os indivĂduos estavam entrando ou saindo do perĂodo de diapausa
Genetic Improvement of Bermudagrass for Hay Producers
Bermudagrass (Cynodon spp.) is considered the most valuable warm-season perennial grass for hay producers in the Southeastern United States. Bermudagrass genotypes have overall good forage quality, high yields, and store well. However, there are challenges to producing good hay for the market. First, early green-up in the spring is needed to allow for four to five productive clippings during the summer. When first establishing production fields, quick emergence and cover are important for reducing weeds. Forage bermudagrass is somewhat tolerant to drought, however, low rainfall substantially reduces yields. If rainfall is too abundant, it is difficult to have timely curing in the field for baling. This is especially true for the higher quality thick-stemmed cultivars such as Tifton 85. More recently, the bermudagrass stem maggot (BSM, Atherigona reversura) has caused yield reductions and reduced net income for hay producers. Plant breeding has attempted to address all these issues. This talk will highlight some areas of research that has been done over the past few decades to improve bermudagrass for hay production
- …