Anomalous KCl(001) Surface Corrugation from Fast He Diffraction at Very Grazing Incidence.

We present theoretical and experimental evidence of an anomalous surface corrugation behavior in He-KCl(001) for incidence along ⟨110⟩. When the He normal energy decreases below 100 meV, i.e., He-surface distances Z>2 Å, the corrugation unexpectedly increases up to an impressive ≳85%. This is not due to van der Waals interactions but to the combination of soft potential effects and the evolution of He-cation and He-anion interactions with Z. This feature, not previously analyzed on alkali-halide surfaces, may favor the alignment properties of weakly interacting overlayers.

New developments for an electron impact (e,2e)(e,3e) spectrometer with multiangle collection and multicoincidence detection.

We describe new developments aimed to extend the capabilities and the sensitivity of the (e,2e)(e,3e) multicoincidence spectrometer at Orsay University [Duguet et al., Rev. Sci. Instrum. 69, 3524 (1998)]. The spectrometer has been improved by the addition of a third multiangle detection channel for the fast "scattered" electron. The present system is unique in that it is the only system which combines three toroidal analyzers all equipped with position sensitive detectors, thus allowing the triple coincidence detection of the three electrons present in the final state of an electron impact double ionization process. The setup allows measurement of the angular and energy distributions of the ejected electrons over almost the totality of the collision plane as well as that of the scattered electron over a large range of scattering angles in the forward direction. The resulting gain in sensitivity ( approximately 25) has rendered feasible a whole class of experiments which could not be otherwise envisaged. The setup is described with a special emphasis on the new toroidal analyzer, data acquisition hardware, and data analysis procedures. The performances are illustrated by selected results of (e,2e) and (e,3e) experiments on the rare gases.

Interdisciplinaridade e integralidade no ensino em saúde / Interdisciplinarity and integrality in health sciences education

Objetivo Este estudo visou analisar os programas e as atividades interdisciplinares e multiprofissionais das Faculdades do Centro de Ciências da Vida da Pontifícia Universidade Católica de Campinas. Métodos Procedeu-se à análise documental e de depoimentos de atores envolvidos na docência, questionando acerca das atividades desenvolvidas nos diferentes cenários: salas de aula, clínicas, hospital e unidades básicas de saúde. Resultados A interdisciplinaridade está presente nas propostas curriculares e como intenção da Universidade, mas acontece fundamentalmente por iniciativas individuais. Na perspectiva dos entrevistados, apesar das dificuldades relativas à fragmentação dos saberes e das práticas, ao desconhecimento e ao preconceito acerca dos campos e núcleos das profissões da saúde e à precarização do vínculo docente, tem havido integração entre os cursos, destacando-se as práticas nos serviços de saúde, em especial na rede básica. Conclusão Diferentes práticas de ensino viabilizam encontros entre discentes, docentes, funcionários e usuários, que demonstram um processo interdisciplinar em construção, distante da transdisciplinaridade.

Objective This study analyzed the interdisciplinary and multiprofessional programs and activities of the Centro de Ciências da Vida da Pontifícia Universidade Católica de Campinas. Methods Documents were analyzed and the faculty interviewed on the activities developed in different settings: classrooms, hospital, clinics and basic health care units. Results Interdisciplinarity is present both in the curricular proposals as in the University?s intension but it happens mostly because of individual initiatives. In the faculty's point of view, despite the difficulties regarding the fragmentation of multidisciplinary knowledge and practices, the ignorance and prejudice found within the s and nuclei of health professions and the weakening of the professor-university employment bond, there has been integration between disciplines, especially regarding practices in health care services, mainly primary health care. Conclusion Different teaching practices allow students, professors, employees and users to join, showing that there is an interdisciplinary process being constructed, far from transdisciplinarity.

Reactive collisions between CH+ and O-.

Integral cross sections were measured for two reactions occurring in CH+ + O- collisions: the formation of the carbon monoxide cation CO+ via a reactive ionization process and the formation of the (iso)formyl cation HCO+ (HOC+) via the associative ionization process. Both carbon monoxide and formyl cations are present in the interstellar medium, the latter one being quite abundant in dense clouds. Provided the oxygen anion would also be present in the interstellar environment, the large efficiency of the two reactive processes reported here would justify their inclusion in astrochemical models. The whole set of data was obtained by means of a merged-beam setup operating with keV beams.

Intense-laser-field ionization of molecular hydrogen in the tunneling regime and its effect on the vibrational excitation of H2+.

H2 molecules were ionized by Ti:sapphire (45 fs, 800 nm) and Nd-doped yttrium aluminum garnet lasers (6 ns, 1064 nm). The relative populations of the vibrational levels of the H+2 ions were determined and found to be concentrated in the lowest vibrational levels. Tunneling ionization calculations with exact field-modified potential curves reproduce the experimental results. The reason for the departure from conventional Franck-Condon-like distributions is the rapid variation of the ionization rate with internuclear distance.

Field evaluation of a slow release pheromone formulation to control the American bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae) in Pakistan.

Trials to control the American bollworm, Helicoverpa armigera (Hübner) by the technique of mating disruption were carried out in the Pakistan Province of Punjab during the 1996 cotton season. A slow release PVC resin formulation, Selibate(R) HA, containing a 97:3 mixture of the major (9Z-hexadecenal) and minor (11Z-hexadecenal) components of the female sex pheromone of H. armigera was applied at a rate of 40 g active ingredient ha-1 during August 1996. The formulation was applied around the terminal portion of the cotton plant by hand using local labour at a rate of c. 250 pieces per hectare. The efficacy of the formulation was compared to conventional insecticide regimes to control H. armigera on four farmer practice fields situated at least 1 km to the north, south, east and west of the pheromone treated area. A high degree of trap catch shutdown (indicating mating suppression) was observed throughout the pheromone treated area during the whole of the season compared to non-pheromone treated farmer practice fields. Night observations confirmed that mating disruption occurred in the pheromone treated area as a smaller percentage of mated females were collected from this area compared to farmer practice fields. A majority of mated females collected from the pheromone treated area mated only once, whereas females in farmer practice fields had undergone multiple matings. A greater percentage of tethered female H. armigera moths retrieved from farmer practice fields had successfully mated compared to tethered females retrieved from the pheromone treated area. Release rate data of H. armigera pheromone from the formulation show that c. 70% was released during the two month trial period. However, the highly dispersive pre-oviposition flight behaviour of females meant that the area treated was not sufficient to eliminate the problem of gravid females migrating in from surrounding areas, and ovipositing therein. The implications of using the technique of mating disruption to control large strong flying insects like H. armigera are discussed.

Avaliaçao de uma unidade docente-assistencial no município de Campinas: alguns aspectos da capacidade resolutiva / Evaluation of a teaching-care unit in Campinas municipality, Brazil: some aspects of resolutive capacity

Analisa os atendimentos dos médicos assistenciais e de acadêmicos de medicina, em uma unidade básica de saúde do Município de Campinas. Levanta a quantidade e as características dos recursos humanos existentes, equipamentos e estrutura física da unidade. A seguir, analisa as atividades desenvolvidas, no período de 18 a 22 de outubro de 1993, pelos médicos assistenciais e pelos acadêmicos do 5§ ano de medicina da PUCCAMP, que säo supervisionados por docentes do Departamento de Medicina Social e Preventiva, utilizando-se a auditoria de prontuários, como forma de avaliar o processo, em uma amostra da populaçäo que demandou atendimento clínico, na unidade em questäo. A qualidade do registro médico apresentou diferenças nas diversas clínicas (adulto, criança e mulher), quando realizada pelos médicos assistenciais e o mesmo ocorreu quando realizada pelo grupo de acadêmicos, supervisionados por docentes. O resultado foi avaliado ao se aplicar questionários logo após o atendimento médico, captando o grau de satisfaçäo dos usuários nas clínicas de adulto, na tocoginecologia e na pediatria

Effect of caffeine on performances of a perceptual-restructuring task at different stages of practice.

Caffeine, a sympathomimetic drug which stimulates the adrenergic nervous system, was hypothesized to exert opposite effects upon performances of a perceptual-restructuring task (the Embedded Figures Task) at different stages of practice. Specifically, caffeine was hypothesized to impair performances of perceptual-restructuring tasks when the task is still novel in early trials; and to facilitate practice induced gains in task performance as the task becomes less novel. Sixty male undergraduates were studied. Each subject was tested on the Embedded Figures Task twice, in one of the following three sequences: caffeine-placebo; placebo-caffeine; and placebo-placebo. Both hypotheses received statistically significant support.