Excited states of beryllium atom from explicitly correlated wave functions

A study of the first excited states of beryllium atom starting from explicitly correlated wave functions is carried out. Several properties are obtained and discussed focusing on the analysis of the Hund's rules in terms of the single--particle and electron pair intracule and extracule densities. A systematic study of the differences on the electronic distributions of the singlet and triplet states is carried out. The trial wave function used to describe the different bound states consists of a generalized Jastrow-type correlation factor times a configuration interaction model wave function. This model wave function has been fixed by using a generalization of the optimized effective potential method to deal with multiconfiguration wave functions. The optimization of the wave function and the calculation of the different quantities is carried out by means of the Variational Monte Carlo method.Comment: 28 pages, 6 figure

Monte Carlo Study of Mixed-Spin S=(1/2,1) Ising Ferrimagnets

We investigate Ising ferrimagnets on square and simple-cubic lattices with exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites and an additional single-site anisotropy term on the S=1 sites. Based mainly on a careful and comprehensive Monte Carlo study, we conclude that there is no tricritical point in the two--dimensional case, in contradiction to mean-field predictions and recent series results. However, evidence for a tricritical point is found in the three-dimensional case. In addition, a line of compensation points is found for the simple-cubic, but not for the square lattice.Comment: 14 pages, 11 figure

Percepción entre médicos bogotanos del riesgo de reacciones adversas a grupos de medicamentos de uso común

Introduction: Adverse drug reactions are a public health problem; however, still many prescribers do not seem to recognize the risk associated with the use of medications.Objective: To assess the perception of the risk of adverse reactions associated with the groups of drugs most frequently used in clinical practice.Materials and methods: Descriptive study made in 200 physicians with at least 2 years of clinical experience in Bogota, Colombia. The risk of adverse drug reactions associated with the use of medications was assessed using a visual analog scale (0-10 points).Results: The perception of risk was <5 points for 19 of the 31 (61%) therapeutic groups. The therapeutic groups that were related to increased perception of risk were chemotherapy for cancer (median, 8.5,interquartile range: 1.8), insulin (median, 8, interquartile range: 4.8) and anticoagulants (median, 7.5, interquartile range: 4).Conclusions: Although there is a relationship between the perception of risk and the frequency of adverse drug reactions associated with therapeutic groups of higher score, there is also a strong underestimation of the risk of medicines in common use at hospital and ambulatory level such as NSAID, antihypertensive drugs and oral contraceptives.Introducción. Las reacciones adversas a medicamentos son un problema de salud pública; sin embargo, todavía son muchos los médicos que no parecen reconocer el riesgo asociado al uso demedicamentos.Objetivo. Valorar la percepción del riesgo de reacciones adversas asociado a los grupos de medicamentos más frecuentemente utilizados por los profesionales de la medicina en la práctica clínica.Materiales y métodos. Se llevó a cabo un estudio descriptivo y transversal con 200 médicos con un mínimo de dos años de experiencia clínica, y vinculados a hospitales públicos o clínicas privadas de Bogotá. La percepción del riesgo asociado a las reacciones adversas a medicamentos de 31 grupos farmacológicos o terapéuticos, se valoró usando una escala analógica visual (0-10 puntos).Resultados. La percepción del riesgo fue baja (puntaje promedio <5) con relación a 19 (61 %) de los 31 grupos de medicamentos. Los tres grupos que se relacionaron con una mayor percepción de riesgode reacciones adversas a medicamentos (puntaje promedio >7) fueron: (a) la quimioterapia para el cáncer (mediana=8,5; rango intercuartílico: 1,8), (b) la insulina (mediana=8; rango intercuartílico: 4,8) y (c) los anticoagulantes (mediana=7,5; rango intercuartílico: 4).Conclusiones. Aunque existe una relación adecuada entre la percepción del riesgo y la frecuencia de las reacciones adversas a los medicamentos asociada con los grupos de mayor puntaje, tambiénexiste una importante subestimación del riesgo en medicamentos de uso común a nivel hospitalario y ambulatorio, como es el caso de los antiinflamatorios no esteroideos, los antihipertensivos y losanticonceptivos orales

Efficacy of chlorimuron-ethyl in the control of Melampodium perfoliatum in soybean

Uma nova e importante planta daninha está ocorrendo em lavouras de soja nos cerrados do Estado de Minas Gerais. O objetivo do ensaio de campo a atividade biológica e a tolerância da cultura de soja cv. 'IAC-8' ao herbicida chlorimuron-ethyl isoladamente e em mistura, quando aplicados em pós-emergência, para o controle da estrelinha (Me/ampodium perfoliatum), em área de Cerrado, em Latossolo Vermelho-Escuro. Os tratamentos foram: chlorimuron-ethyl (12,5 e 15 g/ha) + óleo mineral (0,05% v/v), chlorimuron-ethyl + lactofen a 12,5+ 120 g/ha, chlorimuron-ethyl + fomesafen (12,5+ 150 g/ha) + óleo mineral (0,1% v/v), chlorimuron-ethyl + imazethapyr a 12,5+30 g/ha e testemunha capinada e sem capina. O chlorimuron-ethyl (12,5 e 15 g/ha) + óleo mineral (0,05% v/v), apresentou eficiente controle da estrelinha, com 95% e 97% de controle. Quando o chlorimuron-ethyl foi misturado com lactofen, fomesafen e imazethapyr, mostrou um eficiente índice de controle, entre 96 e 99%, até 132 dias após a aplicação. Chlorimuron-ethyl isolado e em mistura com lactofen, fomesafen e imazethapyr, nas doses testadas, mostrou-se altamente seletivo para a cultura da soja.A new and important weed, Me/ampodium perfoliatum, has been growing in soybean plantations in the "Cerrados" of Minas Gerais, BraziI. The objective of this study was evaluate the biological activity and soybean tolerance to chorimuronethyl alone or tank rnixed with other postemergence herbicides. Treatrnents were: chlorimuron-ethyl (12.5 and 15 g/ha) + mineral oil (0.05% v/v), chlorimuron-ethyl + lactofen at 12.5+120 g/ha, chlorimuon-ethyl + fomesafen (12.5 + 150 gIha) + mineral oil (0.1% v/v) chlorimuron-ethyl + imazethapyr at 12.5 + 30 g/ha and a weedy and a weeded controI. Results indicate that chlorirnuronethy I (12.5 and 15 g/ha) + mineral oil has controlled efficiently (95 and 97%) M. perfoliatum. When chlorimuron-ethyl was rnixed with lactofen, and imazethapyr control increased to 96-99% up 132 days after application. Chlrimuron-ethyl alone or tank mixed with lactofen, fomesafen and imazethapyr has shown to be highly selective to soybean

Magnetic Behavior of a Mixed Ising Ferrimagnetic Model in an Oscillating Magnetic Field

The magnetic behavior of a mixed Ising ferrimagnetic system on a square lattice, in which the two interpenetrating square sublattices have spins +- 1/2 and spins +-1,0, in the presence of an oscillating magnetic field has been studied with Monte Carlo techniques. The model includes nearest and next-nearest neighbor interactions, a crystal field and the oscillating external field. By studying the hysteretic response of this model to an oscillating field we found that it qualitatively reproduces the increasing of the coercive field at the compensation temperature observed in real ferrimagnets, a crucial feature for magneto-optical applications. This behavior is basically independent of the frequency of the field and the size of the system. The magnetic response of the system is related to a dynamical transition from a paramagnetic to a ferromagnetic phase and to the different temperature dependence of the relaxation times of both sublattices.Comment: 10 figures. To be published in Phys.Rev

Cultura do algodoeiro no Estado de Mato Grosso.

bitstream/item/33341/1/CULTURA-MATO-GROSSO.pd

Advancing national greenhouse gas inventories for agriculture in developing countries : improving activity data, emission factors and software technology

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The State-Moro Armed Conflict in the Philippines: Unresolved national question or question of governance?

The continuing struggle of the Moro secessionist movement in the Philippines is one of Southeast Asia’s longest armed conflicts. The tenacity of the conflict lies in two competing concerns: the assertion of self-determination rights of the Moro separatist movement; and the affirmation of the Philippines’ sovereign right to territorial integrity. However, beneath these rights are crucial issues that remain unanswered both by the contending forces—problems where internecine violence and conflict emanate from. This article argues that self-determination rights can be adequately exercised by people who have clearly defined their national identity and concept of a nation. Unfortunately, the Moro multi-ethnic national identity has yet to be crystallised while the idea of a Bangsamoro (Bangsa Nation) remains weak. On the other hand, the state has yet to address the Moros’ legitimate demands of political autonomy, socio-economic development, and social justice and discrimination. Without underestimating the ethnic component of secessionism, the article concludes that poor governance has prolonged, complicated, and further justified the Moros’ quest to secede from the Republic