Macbeth i l’ambició per l’absolut

En aquest treball es plantegen algunes idees sobre l’aplicació de la psicoanàlisi als textos literaris. Trobem actituds diferentsque parteixen de la diferència entre l’anàlisi de persones realsque responen i associen i un text escrit. L’autor de l’articles’inclina a pensar que és possible desenvolupar algunesconjectures sobre el funcionament mental a partir d’una obra,sempre que ho sapiguem fer amb les degudes limitacions irespectant l’especificitat del camp estètic. Macbeth ésdescrita, aquí, com una tragèdia impulsada per una ambició per l’absolut, que per aquesta mateixa raó és condemnada alfracàs. L’argumentació de l’autor segueix algunes idees deBion respecte al funcionament conjunt de l’amor, l’odi i el coneixement, així com del resultat de l’atac a aquestesfuncions per la part destructiva de la personalitat

El procés de simbolització en la transferència

L’autor descriu el pas, en el pensament psicoanalític, des delsímbol als processos de simbolització. Es comenten algunsconceptes relacionats amb el no conegut, però que esconsidera el punt de partida dels processos simbòlics. SeguintFreud, Klein, Bion i d’altres, es relaciona la simbolització ambla creació de l’espai psíquic intern que resulta de l’elaboracióde la situació edípica primerenca. El símbol, per a la psicoanàlisi,està sempre obert a nous desenvolupaments i rep elsseus estímuls de fonts infinites

Constitutive modeling for isotropic materials

The third and fourth years of a 4-year research program, part of the NASA HOST Program, are described. The program goals were: (1) to develop and validate unified constitutive models for isotropic materials, and (2) to demonstrate their usefulness for structural analysis of hot section components of gas turbine engines. The unified models selected for development and evaluation were those of Bodner-Partom and of Walker. The unified approach for elastic-viscoplastic constitutive equations is a viable method for representing and predicting material response characteristics in the range where strain rate and temperature dependent inelastic deformations are experienced. This conclusion is reached by extensive comparison of model calculations against the experimental results of a test program of two high temperature Ni-base alloys, B1900+Hf and Mar-M247, over a wide temperature range for a variety of deformation and thermal histories including uniaxial, multiaxial, and thermomechanical loading paths. The applicability of the Bodner-Partom and the Walker models for structural applications has been demonstrated by implementing these models into the MARC finite element code and by performing a number of analyses including thermomechanical histories on components of hot sections of gas turbine engines and benchmark notch tensile specimens. The results of the 4-year program have been published in four annual reports. The results of the base program are summarized in this report. The tasks covered include: (1) development of material test procedures, (2) thermal history effects, and (3) verification of the constitutive model for an alternative material

Isolasi Dan Karakterisasi Bakteri Endofit Penghasil Inhibitor α-Glukosidase Dari Tanaman Pare (Momordica Charantia L)

Diabetes merupakan penyakit metabolik yang serius di Indonesia. Jumlah penderita diabetes mengalami peningkatan setiap tahunnya. Inhibitor α-glukosidase merupakan senyawa yang dapat menghambat enzim α-glukosidase sehingga bermanfaat sebagai obat antidiabetes. Tanaman Pare (Momordica charantia) diketahui memiliki kasiat sebagai anti diabetes. Senyawa aktif yang dihasilkan tanaman tersebut dapat berasal dari endofit yang hidup di dalam jaringan tanaman. Eksplorasi bakteri endofit dari tanaman pare merupakan salah satu cara untuk mendapatkan isolat bakteri penghasil inhibitor enzim α-glukosidase. Isolasi bakteri dilakukan dengan menginokulasikan sampel tanaman yang telah disterilisasi permukaan pada media agar. Isolat bakteri yang didapat selanjutnya dimurnikan dan di karakterisasi lebih lanjut baik morfologi maupun aktivitas inhibitor α-glukosidasenya. Pengujian aktivitas inhibitor α-glukosidase menggunakan metode spektrofotometer dengan nitrofenil-α-D-glukopiranosida sebagai substrat. Hasil penelitian diperoleh 5 isolat bakteri endofit penghasil inhibior α-glukosidase. Penghambatan terbesar ditunjukkan oleh isolat bakteri Ad 1 yaitu sebesar 27,4%

Unified constitutive models for high-temperature structural applications

Unified constitutive models are characterized by the use of a single inelastic strain rate term for treating all aspects of inelastic deformation, including plasticity, creep, and stress relaxation under monotonic or cyclic loading. The structure of this class of constitutive theory pertinent for high temperature structural applications is first outlined and discussed. The effectiveness of the unified approach for representing high temperature deformation of Ni-base alloys is then evaluated by extensive comparison of experimental data and predictions of the Bodner-Partom and the Walker models. The use of the unified approach for hot section structural component analyses is demonstrated by applying the Walker model in finite element analyses of a benchmark notch problem and a turbine blade problem

Compactifications of Type IIB Strings to Four Dimensions with Non-trivial Classical Potential

Type IIB strings are compactified on a Calabi-Yau three-fold. When Calabi-Yau-valued expectation values are given to the NS-NS and RR three-form field strengths, the dilaton hypermultiplet becomes both electrically and magnetically charged. The resultant classical potential is calculated, and minima are found. At singular points in the moduli space, such as Argyres-Douglas points, supersymmetric minima are found. A formula for the classical potential in $N=2$ supergravity is given which holds in the presence of both electric and magnetic charges.Comment: 32 pages REVTeX, no figure

Constitutive modeling for isotropic materials (HOST)

The results of the third year of work on a program which is part of the NASA Hot Section Technology program (HOST) are presented. The goals of this program are: (1) the development of unified constitutive models for rate dependent isotropic materials; and (2) the demonstration of the use of unified models in structural analyses of hot section components of gas turbine engines. The unified models selected for development and evaluation are those of Bodner-Partom and of Walker. A test procedure was developed for assisting the generation of a data base for the Bodner-Partom model using a relatively small number of specimens. This test procedure involved performing a tensile test at a temperature of interest that involves a succession of strain-rate changes. The results for B1900+Hf indicate that material constants related to hardening and thermal recovery can be obtained on the basis of such a procedure. Strain aging, thermal recovery, and unexpected material variations, however, preluded an accurate determination of the strain-rate sensitivity parameter is this exercise. The effects of casting grain size on the constitutive behavior of B1900+Hf were studied and no particular grain size effect was observed. A systematic procedure was also developed for determining the material constants in the Bodner-Partom model. Both the new test procedure and the method for determining material constants were applied to the alternate material, Mar-M247 . Test data including tensile, creep, cyclic and nonproportional biaxial (tension/torsion) loading were collected. Good correlations were obtained between the Bodner-Partom model and experiments. A literature survey was conducted to assess the effects of thermal history on the constitutive behavior of metals. Thermal history effects are expected to be present at temperature regimes where strain aging and change of microstructure are important. Possible modifications to the Bodner-Partom model to account for these effects are outlined. The use of a unified constitutive model for hot section component analyses was demonstrated by applying the Walker model and the MARC finite-element code to a B1900+Hf airfoil problem

THE SHMUSHKEVICH METHOD FOR HIGHER SYMMETRY GROUPS OF INTERACTING PARTICLES

About 60 years ago, I. Shmushkevich presented a simple ingenious method for computing the relative probabilities of channels involving the same interacting multiplets of particles, without the need to compute the Clebsch-Gordan coefficients. The basic idea of Shmushkevich is “isotopic non-polarization” of the states before the interaction and after it. Hence his underlying Lie group was SU(2). We extend this idea to any simple Lie group. This paper determines the relative probabilities of various channels of scattering and decay processes following from the invariance of the interactions with respect to a compact simple a Lie group. Aiming at the probabilities rather than at the Clebsch-Gordan coefficients makes the task easier, and simultaneous consideration of all possible channels for given multiplets involved in the process, makes the task possible. The probability of states with multiplicities greater than 1 is averaged over. Examples with symmetry groups O(5), F(4), and E(8) are shown

Constitutive modeling for isotropic materials (HOST)

The results of the first year of work on a program to validate unified constitutive models for isotropic materials utilized in high temperature regions of gas turbine engines and to demonstrate their usefulness in computing stress-strain-time-temperature histories in complex three-dimensional structural components. The unified theories combine all inelastic strain-rate components in a single term avoiding, for example, treating plasticity and creep as separate response phenomena. An extensive review of existing unified theories is given and numerical methods for integrating these stiff time-temperature-dependent constitutive equations are discussed. Two particular models, those developed by Bodner and Partom and by Walker, were selected for more detailed development and evaluation against experimental tensile, creep and cyclic strain tests on specimens of a cast nickel base alloy, B19000+Hf. Initial results comparing computed and test results for tensile and cyclic straining for temperature from ambient to 982 C and strain rates from 10(exp-7) 10(exp-3) s(exp-1) are given. Some preliminary date correlations are presented also for highly non-proportional biaxial loading which demonstrate an increase in biaxial cyclic hardening rate over uniaxial or proportional loading conditions. Initial work has begun on the implementation of both constitutive models in the MARC finite element computer code