Critical sets of nonlinear Sturm-Liouville operators of Ambrosetti-Prodi type

The critical set C of the operator F:H^2_D([0,pi]) -> L^2([0,pi]) defined by F(u)=-u''+f(u) is studied. Here X:=H^2_D([0,pi]) stands for the set of functions that satisfy the Dirichlet boundary conditions and whose derivatives are in L^2([0,pi]). For generic nonlinearities f, C=\cup C_k decomposes into manifolds of codimension 1 in X. If f''0, the set C_j is shown to be non-empty if, and only if, -j^2 (the j-th eigenvalue of u -> u'') is in the range of f'. The critical components C_k are (topological) hyperplanes.Comment: 6 pages, no figure

Fibers and global geometry of functions

Since the seminal work of Ambrosetti and Prodi, the study of global folds was enriched by geometric concepts and extensions accomodating new examples. We present the advantages of considering fibers, a construction dating to Berger and Podolak's view of the original theorem. A description of folds in terms of properties of fibers gives new perspective to the usual hypotheses in the subject. The text is intended as a guide, outlining arguments and stating results which will be detailed elsewhere

Observações do comprimento e número de frutos do primeiro cacho de três genótipos de mamoneira em Senhor do Bonfim, BA.

Objetivou-se com este trabalho estimar a variabilidade do comprimento do 1o cacho, do número de frutos (bagas) do 1o cacho e da produtividade global das variedades de mamona BRS 149 Nordestina, BRS188 Paraguaçu e SMS Pernambucana na região de Senhor do Bonfim, BA. O experimento foi realizado na Escola Agrotécnica Federal de Senhor do Bonfim ? EAFSB com a participação da Embrapa Semi-Árido, que forneceu as sementes. O delineamento experimental adotado foi em blocos ao acaso, com quatro repetições. Não ocorreu influência significativa dos genótipos nas variáveis comprimento e número de bagas do 1o cacho. Houve correlação entre as variáveis analisadas. As mamonas BRS-149 (Nordestina) e BRS-188 (Paraguaçu) ofereceram valores próximos aos indicados pela EMBRAPA, mas a SMS-Pernambucana ofereceu boa produtividade 63 % superior à indicada pela CONAB.Resumo

Produtividade das cultivares pernambucana, BRS Paraguaçu e BRS Nordestina em Senhor do Bonfim, BA.

Objetivou-se neste trabalho quantificar o total de cachos, o número de sementes e a altura da planta da svariedades BRS Nordestina, BRS Paraguaçu e SMS Pernambucana na região de Senhor do Bonfim, BA

Aspectos ecológicos de Cratylia argentea na região central de Minas Gerais.

Aspectos ecológicos de Cratylia argentea foram estudados na região Central de Minas Gerais para avaliar seu potencial em ofertar serviços ambientais aos sistemas agroecológicos. Durante as visitas às 13 unidades de observação/experimentação (UOE), ocorridas entre 2009 e 2017, foram feitos registros fotográficos, que permitiram caracterizar seus padrões fenológicos ao longo do ano, sua reação a fatores abióticos (fogo, estresse hídrico), bióticos (herbivoria de formigas Atta sp. e de abelhas Trigona sp.) e qualificar a presença de artrópodes e vertebrados em seu dossel. A diferenciação floral de C. argentea inicia-se no final do mês de fevereiro. As flores se abrem entre abril e outubro, com maior intensidade entre junho e agosto. C. argentea apresentou forte rebrota após queimadas e herbivoria de Atta sp., mesmo durante período de estiagem. As abelhas representaram 15,5% dos artrópodos visitantes, agentes de controle biológico, 24% e fitófagos, 60,5%.Edição dos anais do VI Congresso Latino-Americano de Agroecologia, Brasília, DF, 2017

What prompts young adults in Ireland to attend health services for STI testing?

<p>Abstract</p> <p>Background</p> <p>In-depth understanding of the factors that prompt young adults to attend health services for sexually transmitted infection (STI) testing are needed to underpin sexual health programes. We conducted a qualitative study to identify and explore why young adults (18–29 years) in Ireland attended specialist and community health services for STI testing; the factors that supported/undermined their decisions to seek STI testing; and any factors that led to delay in seeking STI testing.</p> <p>Methods</p> <p>Semi-structured interviews with 30 adults (21 women, 9 men). Young adults were recruited from General Practice (GP) practices, Third Level College health services, Family Planning clinics and specialist STI treatment services for men who have sex with men (MSM). Interview questions examined why respondents decided to go for STI testing, whether they acted upon this desire immediately or decided to wait, and what they felt were important barriers/enablers to their health-seeking attempts. Interviews were thematically analyzed using standard qualitative techniques.</p> <p>Results</p> <p>Respondents sought STI testing for one of four reasons: they had reached a transitional moment in their lives (they were either about to stop using condoms with their sexual partner or were emerging from a period of their lives where they had a series of risky sexual relationships); they had had unprotected sex with a casual partner; they had symptoms of infection; and/or they were required to do so by their employer. Catalytic factors included media and government health promotion campaigns and knowing someone with an STI. However, many respondents delayed seeking testing. Reasons included respondents' concerns about stigma and that they would be judged by healthcare professionals, and feelings of invulnerability. Importantly, several respondents who waited up to four weeks to make an appointment after their initial decision to seek STI testing did not view this as delay.</p> <p>Conclusion</p> <p>Sexual health promotion campaigns for young people should address the reasons why they delay testing, specifically through measures to avoid stigma (supply-side) and reassure young adults (demand-side). Strategies to increase testing-uptake should focus on these four key opportunities – young adults leaving relationships, those entering relationships where condoms will not be used, those who have had unprotected sex and those with STI-related symptoms.</p

Observações do comprimento e número de frutos do primeiro cacho de três genótipos de mamoneira em Senhor do Bonfim, BA.

Resumo