Twistor Phase Space Dynamics and the Lorentz Force Equation

Using Lorentz force equation as an input a Hamiltonian mechanics on the non-projective two twistor phase space TxT is formulated. Such a construction automatically reproduces dynamics of the intrinsic classical relativistic spin. The charge appears as a dynamical variable. It is also shown that if the classical relativistic spin function on TxT vanishes, the natural conformally invariant symplectic structure on TxT reduces to the natural symplectic structure on the cotangent bundle of the Kaluza-Klein space.Comment: LaTeX file, 20 page

Barriers to Work Place Advancement: the Experience of the White Female Work Force

Glass Ceiling ReportGlassCeilingBackground17WhiteFemaleWorkForce.pdf: 8903 downloads, before Oct. 1, 2020

Relativistic Spinor Dynamics Inducing the Extended Lorentz-Force-Like Equation

The special relativistic dynamical equation of the Lorentz force type can be regarded as a consequence of a succession of space-time dependent infinitesimal Lorentz transformations as shown by one of us \cite{buitrago} and discussed in the introduction below. Such an insight indicates that the Lorentz-force-like equation has an extremely fundamental meaning in physics. In this paper we therefore present a set of dynamical Weyl spinor equations {\em inducing} the extended Lorentz-force-like equation in the Minowski space-time. The term extended refers to the dynamics of some additional degrees of freedom that may be associated with the classical spin namely with the dynamics of three space-like mutually orthogonal four-vectors, all of them orthogonal to the linear four-momentum of the object under consideration.Comment: 15 page

Regulation of Murine Class I Genes by Interferons is Controlled by Regions Located Both 5' and 3' to the Transcription Initiation Site

Interferons regulate the expression of a large number of mammalian genes, including the major histocompatibility antigen genes. To investigate the mechanisms involved in interferon action, we have analyzed the ability of murine H-2Ld and H-2Dd DNA sequences to control the responses to interferon. The results indicate that interferon regulation of class I gene expression is complex and involves at least two mechanisms that are dependent on class I sequences located upstream and downstream to the transcription initiation site. In transfected mouse L cells, both of these regions are required for full enhancement of class I gene expression, with the major portion of the response controlled by the sequences located 3' to the transcription initiation site. The fine-mapping analysis of the 5' region-encoded response also suggests that recombinant alpha and gamma interferons may exert their effects on class I gene expression by using different cis-acting regulatory sequences

Directly Interacting Massless Particles - a Twistor Approach

Twistor phase spaces are used to provide a general description of the dynamics of a finite number of directly interacting massless spinning particles forming a closed relativistic massive and spinning system with an internal structure. A Poincare invariant canonical quantization of the so obtained twistor phase space dynamics is performed.Comment: LaTeX, approx. 16 pages; to appear in Journal of Mathematical Physics, March or April 1996 issu

Twistors, special relativity, conformal symmetry and minimal coupling - a review

An approach to special relativistic dynamics using the language of spinors and twistors is presented. Exploiting the natural conformally invariant symplectic structure of the twistor space, a model is constructed which describes a relativistic massive, spinning and charged particle, minimally coupled to an external electro-magnetic field. On the two-twistor phase space the relativistic Hamiltonian dynamics is generated by a Poincare scalar function obtained from the classical limit (appropriately defined by us) of the second order, to an external electro-magnetic field minimally coupled, Dirac operator. In the so defined relativistic classical limit there are no Grassman variables. Besides, the arising equation that describes dynamics of the relativistic spin differs significantly from the so called Thomas Bergman Michel Telegdi equation.Comment: 39 pages, no figures, few erronous statements (not affecting anything else in the papper) on page 23 delete

Analysis of success in beginning reading in relation to knowledge of letter names, experiential background and school adjustment.

Thesis (Ed.M.)--Boston Universit

Cognitive Functioning of Male Adult Children of Alcoholics and Control Subjects While Under the Influence of Acute Alcohol Intoxication

Previous research has suggested that adult children of alcoholics (ACAs) are at increased risk for the development of alcoholism. Differences between ACA and control subjects have been reported for a range of cognitive, affective and behavioral measures in addition to certain components of the auditory evoked potential, supporting speculation that biological or psychological markers exist as predictors of future alcoholism. The present study examined 20 males ACA and 20 male control subjects under either placebo or alcohol experimental conditions using cognitive measures (Digit Span, Trail Making, Digit Symbol) at baseline, peak and descent phase of the session that have been associated with proposed evoked potential and neuropsychological deficits among subjects with a positive history for alcoholism. The results failed to demonstrate predicted baseline deficits among ACA subjects in any of the dependent measures or placebo expectancy effects from either group. These previous results demonstrating cognitive deficits in ACA functioning were discussed in terms of research designs that possibly were confounded by subject drinking histories. The ACA subjects were found to demonstrate superior recovery of function on the Digit Span backward test at the descent phase of testing. These results appeared to support a hypothesis that ACA\u27s are less influenced and recover faster from the effects of acute alcohol intoxication. This conclusion would appear consistent with previous studies describing diminished mood state changes, decreased sensitivity to bodily sensations and underestimates of blood alcohol levels by ACA subjects. Recommendations for future research are provided