A portable Compton spectrometer for clinical X-ray beams in the energy range 20-150 keV

Primary beam spectra were obtained for an X-ray industrial equipment (40-150 kV), and for a clinical mammography apparatus (25-35 kV) from beams scattered at angles close to 90 degrees, measured with a CdTe Compton spectrometer. Actual scattering angles were determined from the Compton energy shift of characteristic X-rays or spectra end-point energy. Evaluated contribution of coherent scattering amounts to more than 15% of fluence in mammographic beams. This technique can be used in clinical environments. (C) 2010 Elsevier Ltd. All rights reserved.

Olhares caleidoscópicos do teatro de Qorpo-Santo

O Teatro de Joaquim José de Campos Leão ou, simplesmente, Qorpo-Santo é marcadamente um texto lacunar, como o próprio autor ressaltaria em vários momentos de "Ensiqlopédia ou Seis Mezes de Uma Enfermidade", publicação por ele realizada e única fonte filológica de seus textos. Nossa proposta de análise se vale da necessidade nos debruçarmos sobre a dramaturgia de Qorpo-Santo. Nosso objetivo é, sempre que possível, conferir um sentido ou, em outros termos, criar possibilidades representativas ao hermético texto teatral deste autor. Na tentativa de desvendá-lo, fomos ao encontro dos elementos interpretativos necessários para completar as lacunas deixadas no texto do autor. Seus textos constituem-se de verdadeiras "colchas calidoscópicas", já que neles encontramos várias possibilidades interpretativas ao tentarmos preencher os vagos dos recortes encontrados na sua obra. Inicialmente nos basta deixar os seus textos mais nítidos, quando possível, para que se possamos desconsiderar opiniões de que "os textos de Qorpo-Santo são para ser lido e não para ser encenados", para nós, isso é apenas mais uma das ilusões que permeiam a história do Duque do Triunfo, que devem ser superadas a partir do momento que dermos o devido sentido a esses textos, a partir do ponto que observamos a loucura como um discurso e uma proposição dentro da obra e da vida do autor.

Structure of the N=50 As, Ge, Ga nuclei

The level structures of the N = 50 As-83, Ge-82, and Ga-81 isotones have been investigated by means of multi-nucleon transfer reactions. A first experiment was performed with the CLARA PRISMA setup to identify these nuclei. A second experiment was carried out with the GASP array in order to deduce the gamma-ray coincidence information. The results obtained on the high-spin states of such nuclei are used to test the stability of the N = 50 shell closure in the region of Ni-78 (Z = 28). The comparison of the experimental level schemes with the shell-model calculations yields an N = 50 energy gap value of 4.7(3) MeV at Z = 28. This value, in a good agreement with the prediction of the finite-range liquid-drop model as well as with the recent large-scale shell model calculations, does not support a weakening of the N = 50 shell gap down to Z = 28. (c) 2012 Elsevier B.V. All rights reserved.

The influence of Theosophy on Mondrian's neoplastic work

(ENG)The influence of Theosophy in the symbolist painting of Mondrian (1908-1911) has been unanimously recognized. There is not, however, the same consensus with respect to the influence of theosophy in his neoplastic period. There is a relationship between Mondrian’s theoretical writing and his practical work, but no proportionality. Mondrian’s theoretical discourse is not limited to painting and touches on other arts and disciplines (architecture, urbanism). Mondrian will define a complex – philosophical? – system whose final goal will be to completely transform the human visual environment. That is to say that the area covered by his theoretical discourse widely exceeds that of his practical activity (painting). The goal of this article is to try to delimit the scope of Theosophy’s influence on Mondrian’s work during his neoplastic period, in his theoretical writing and in his practical production. (SPA)La influencia de la teosofía en la pintura simbolista de Mondrian (1908-1911) es unánimemente reconocida. No existe el mismo consenso respecto a la influencia de la teosofía durante su periodo neoplástico. Existe relación entre los escritos teóricos de Mondrian y su obra práctica, pero no proporcionalidad. El discurso teórico de Mondrian no se limita a la pintura, sino que alcanza a otras artes y disciplinas (la arquitectura, la ciudad). Mondrian va a definir un complejo sistema -¿filosófico?- cuyo objetivo final será la transformación de todo el entorno visual del ser humano. Es decir, el ámbito de su discurso teórico supera ampliamente el de su actividad práctica (la pintura). El objetivo de este artículo es el de tratar de acotar el alcance de la influencia de la teosofía en la obra de Mondrian de su periodo neoplástico, tanto en sus escritos teóricos como en su pintura.

The influence of magnetic field geometry on magnetars X-ray spectra

Nowadays, the analysis of the X-ray spectra of magnetically powered neutron stars or magnetars is one of the most valuable tools to gain insight into the physical processes occurring in their interiors and magnetospheres. In particular, the magnetospheric plasma leaves a strong imprint on the observed X-ray spectrum by means of Compton up-scattering of the thermal radiation coming from the star surface. Motivated by the increased quality of the observational data, much theoretical work has been devoted to develop Monte Carlo (MC) codes that incorporate the effects of resonant Compton scattering (RCS) in the modeling of radiative transfer of photons through the magnetosphere. The two key ingredients in this simulations are the kinetic plasma properties and the magnetic field (MF) configuration. The MF geometry is expected to be complex, but up to now only mathematically simple solutions (self-similar solutions) have been employed. In this work, we discuss the effects of new, more realistic, MF geometries on synthetic spectra. We use new force-free solutions [14] in a previously developed MC code [9] to assess the influence of MF geometry on the emerging spectra. Our main result is that the shape of the final spectrum is mostly sensitive to uncertain parameters of the magnetospheric plasma, but the MF geometry plays an important role on the angle-dependence of the spectra.

Diary of Elias Mann, 1796-1800

Elias Mann kept this diary during his undergraduate years at Harvard College. The diary begins August 17, 1796 and ends in August of 1800 and also includes several undated sheets filled with excerpts of poems. The daily entries describe many aspects of Mann's life, including not only his experiences at Harvard but also his involvement in the larger community. Entries related to life at Harvard describe club meetings (coffee club, Hasty Pudding Club and Phi Beta Kappa); trips to the theater; dinners at taverns; games and recreation, including a card game called "Loo," cribbage, backgammon, bowling, playing ball, fishing, skating and going for sleigh rides; gathering, and sometimes taking from others' gardens, food (most often plums, peaches, nuts and apples); what he ate (including one breakfast of three raw eggs and two glasses of wine); what he read (including Tristram Shandy and one of "Mrs. Ratcliffe's novels"); his friends, often mentioned by name; and academic work and formalities. In one entry he mentions the theft of several possessions from his room, and there are several entries about trips to Fresh Pond.

Report of the Commissioners appointed to inquire into the several matters relating to coal in the United Kingdom.

Duke of Argyll, chairman.

R.P. Francisci Suarez, Granatensis, e Societate Iesu doctoris theologi, et in Connimbricensi Academia Sacrarum Literarum primarii professoris opus, De virtute et statu religionis. Quo quid contineatur, index proximus indicabit.

Also issued as part of collection with collective title page, engraved portrait of author, biographical preface, and contents list: "R.P. Francisci Suarez Granatensis, e Societate Iesu Doctoris Theologi, et in Regia Conimbricensi Academia primarij theologiae professoris emeriti Opera omnia quorum cathalogum vide lector in vita authoris. Moguntiae, Sumptibus Hermanni Mylij Birckmanni Excudebat Balthasar Lippius. Anno M. DCXXI."

R.P. Francisci Suarez Granatensis, e Societate Iesu Doctoris Theologi; et in Conimbricensi Academia Sacrarum Litterarum olim Primarij Professoris Emeriti De diuina gratia pars prima[-postrema] : continens prolegomena sex, & duos priores libros de necessitate diuinæ gratiæ ad honesta opera.

Signatures: vol. 1: )(⁶ A-Z⁶ 2A-2P⁶ 2Q⁴; vol. 2: )(² A-Z⁶ 2A-2Z⁶ 3A-3C⁶ 3D⁸ (3D₈ blank).