Physical Sciences and Mathematics Commons^™

International Conservation Leadership And The Challenges Of The Nineties, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Producción En Venezuela De Gases Que Destruyen La Capa De Ozono, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Un Asunto De Calidad De Vida, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

The Application Of Liquid Junctions For Characterization Of Semiconductor Materials, Wu-Mian Shen

Dissertations, Theses, and Capstone Projects

In this study, liquid junctions were used to characterize silicon and silicon subjected to various reactive ion etching (RIE); surface optimization of CuInSe{dollar}\sb2{dollar}; and photo-modification of InSe. Impedance spectroscopy and modulation spectroscopies such as electrolyte electroreflectance (EER), photoreflectance (PR), and photoreflectance in the presence of electrolyte (EPR) were the major methodologies that were used for investigating the dielectric properties of the semiconductors and their interface with the ambients. It was shown that the above experimental techniques provide information about the flat-band potential, doping density, Fermi level pinning, the density and distribution of surface states, energy gap and broadening parameter related …

Generating Unbiased Ratio And Regression Estimators, William (Bill) H. Williams

Publications and Research

Standard ratio and regression are only conditionally unbiased. The paper uses split sample techniques to develop unbiased versions.

Kähler-Chern-Simons Theory And Symmetries Of Anti-Self-Dual Gauge Fields, V. Parameswaran Nair, Jeremy Schiff

Publications and Research

Kähler-Chern-Simons theory, which was proposed as a generalization of ordinary Chern-Simons theory, is explored in more detail. The theory describes anti-self-dual in-stantons on a four-dimensional Kähler manifold. The phase space is the space of gauge potentials, whose symplectic reduction by the constraints of anti-self-duality leads to the moduli space of instantons. We show that infinitesimal Bäcklund transformations, previously related to "hidden symmetries" of instantons, are canonical transformations generated by the anti-self-duality constraints. The quantum wave functions naturally lead to a generalized Wess-Zumino-Witten action, which in turn has associated chiral current algebras. The dimensional reduction of the anti-self-duality equations leading to …

Relativistic Wave Equation For Anyons, R. Jackiw, V. Parameswaran Nair

Publications and Research

Construction of one-particle states as unitary representations of the Poincare algebra in 2 + 1 dimensions shows that an anyon has one polarization state. However, for nonzero spin manifestly linear and covariant realizations of Lorentz transformations require more than one field component, and an infinite number is needed when the value of spin is not an integer or half-integer. We discuss the relation between these two aspects of Poincare symmetry. In particular, we construct a relativistic equation for anyons where the number of physical polarizations is reduced to one by virtue of a gauge symmetry or equivalent constraint.

Su Excelencia, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Conversión Ambiental En Sector De Los Recursos Naturales. Tomo 2, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Las Guerras De Ahora Matan También Envenenando El Ambiente, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Sierra De La Culata: Ecosistema Único En El Mundo, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Parque Automotor, Principal Contaminante, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Ecología Y Economía, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

A Kähler-Chern-Simons Theory And Quantization Of Instanton Moduli Spaces, V. P. Nair, Jeremy Schiff

Publications and Research

A five dimensional field theory is introduced which is an analogue of three dimensional Chern-Simons theory. The reduced phase space in the theory is a moduli phase of instantons in four dimensional Euclidean gauge theory, with a symplectic structure induced by the Donaldson u-map. Issues related to quantization are discussed.

Conservación En Paraguaná: ¿Misión Imposible?, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Desiertos Sin Oasis Sigue Fabricando El Hombre, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Mucha Agua, Muchos Problemas, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Acta Científica Venezolana, Aldemaro Romero Jr., A. Ignacio Agudo, Ana Mayayo

Publications and Research

No abstract provided.

Protegiendo El Patrimonio Natural De Paraguaná, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Notes On Venezuelan Conservation, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Nuevo Parque Nacional: Sierra De La Culata, Ecosistema Único En El Mundo, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

El Continente De Todos Y De Nadie: El Antártico, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Biological Activity And Conformational Analysis Of Nikkomycins And Their Analogs, Eduardo Krainer

Dissertations, Theses, and Capstone Projects

Nikkomycins and polyoxins are peptidyl nucleoside antibiotics produced by Streptomyces species. They are potent inhibitors of chitin synthetases from pathogenic fungi, and polyoxins have been used in Japan for many years as agricultural fungicides and for insect control. Since chitin synthetase is not found in mammals and both families of antibiotics are not toxic, these inhibitors are potentially attractive for clinical use. Unfortunately these compounds seem to have only a fungistatic action, and they are not used clinically at present.

A procedure for efficiently obtaining nikkomycins X and Z of very high purity from crude antibiotic is described. These nikkomycins …

Topological Gauge Theory And Twistors, V. Parameswaran Nair, Jeremy Schiff

Publications and Research

By use of harmonic superfields, Witten’s topological gauge theory is written as a field theory on a supertwistor space. Further, using the realisation of complex compactified Minkowski space as a quadric in CP⁵, we show that the theory has a simple formulation in terms of analytic superfields on super-CP⁵ × CP³ .

U(1) Chern-Simons Theory And C=1 Conformal Blocks, Michiel Bos, V. Parameswaran Nair

Publications and Research

The quantization of the U ( 1 ) Chern-Simons action in three dimensions is carried out in a coherent state representation. The wave functionals obtained are generating functionals for the current correlator blocks of two-dimensional c= 1 rational conformal field theories, explicitly realizing a connection found by Witten.

La Suerte De Paraguaná No Está Sellada: Guarda Reservas De Un Gran Pasado, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

El Hombre Comenzó A Extinguir Especies Hace 11.000 Años, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

¿Ecoturismo: Peligro O Panacea?, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

Theoretical Studies Of The Energies And Geometries Of Strained Hydrocarbons, Mitchell Alan Miller

Dissertations, Theses, and Capstone Projects

Theoretical models are used to explore problems of interest to organic chemists in four projects. The first three apply existing methodologies to investigate a series of strained cyclic hydrocarbon molecules; the fourth develops methodology.

Project I. Semiempirical calculations have been performed on a variety of hydrocarbons composed of fused cyclobutane rings using the MNDO, AM1 and MM2 methods. The systems studied include linearly concatenated cyclobutanes (ladderanes), cyclic structures (prismanes) and two 'star-shaped' C₂₄H₂₄ hydrocarbons, helvetane and israelane. The results reported include optimized geometries, heats of formation and vibrational frequencies. The performance of the theoretical models is evaluated …

A Current Algebra For Some Gauge Theory Amplitudes, V. Parameswaran Nair

Publications and Research

The classical amplitude for scattering of two positive helicity and n-2 negative helicity (or the other way) gauge bosons is shown to be generated by a Wess-Zumino-Witten (WZW) model for N= 4 supersymmetric gauge theory; i.e. the current algebra of the WZW model (with central charge k= 1 ) gives a Kac-Moody algebra as the symmetry behind these amplitudes.