The Initial-Value Problem of Spherically Symmetric Wyman Sector Nonsymmetric Gravitational Theory

We cast the four-dimensional field equations of the Nonsymmetric Gravitational Theory (NGT) into a form appropriate for numerical study. In doing so, we have restricted ourselves to spherically symmetric spacetimes, and we have kept only the Wyman sector of the theory. We investigate the well-posedness of the initial-value problem of NGT for a particular data set consisting of a pulse in the antisymmetric field on an asymptotically flat space background. We include some analytic results on the solvability of the initial-value problem which allow us to place limits on the regions of the parameter space where the initial-value problem is solvable. These results are confirmed by numerically solving the constraints.Comment: REVTeX 3.0 with epsf macros and AMS symbols, 18 pages, 9 figure

Abelian Anomalies in Nonlocal Regularization

Nonlocal regularization of QED is shown to possess an axial anomaly of the same form as other regularization schemes. The Noether current is explicitly constructed and the symmetries are shown to be violated, whereas the identities constructed when one properly considers the contribution from the path integral measure are respected. We also discuss the barrier to quantizing the fully gauged chiral invariant theory, and consequences.Comment: 21 pages, UTPT-93-0

A pilot study of the effect of a sensory diet on the in-seat behaviour of grade one learners in the classroom

Sensory integration based paediatric occupational therapists working in schools commonly function with a dual role of providing the child with therapy to assist the child to function optimally as well as act as consultants in assisting teachers to develop strategies to help promote the classroom performance of students with sensory processing difficulties. A single-group pre test post test quasi-experimental research design was used in this pilot study on a convenient sample of 11 participants to explore the effects before and after exposure to the intervention of a sensory diet on the in-seat behaviours of the child and determine whether the desirable sensory input is effective in improving the performance of children with sensory processing difficulties during a handwriting lesson. The behaviours showing the highest trend of improvement in the hypothesized direction included less distractibility and trend of work ethos related behaviours (not giving up easily and completing the task; being less impulsive, not working too fast, better planning; better able to initiate and carry tasks out independently). Trends of various in-seat behaviours (restless, overactive and fidgety, disorganized on self and in his work, difficulty in getting down to his work, slow to complete a task) to regress in the hypothesized direction were also noted. Descriptive and statistical analysis was performed to examine trends in changes of pre- and post-intervention behavioural scores. The data were also analysed using Poisson’s regression to the normal distribution to calculate p values (using a chisquared distribution) to compare the number of observations in a period of time intervals. Implications of the results of the study for therapists working with students with sensory processing difficulties and their teachers are discussed

Beats + Sample Manipulation in Pure Data with Raspberry Pi

Musical work for the Dossier “A quarter of century of Pd: past, present and future” [note by editor]Link #1: https://youtube.com/playlist?list=PLXdYuKtwUhUrirWQ0B2X7XhfrBCGJVlG

Beats + Sample Manipulation in Pure Data with Raspberry Pi

Musical work for the Dossier "A quarter of century of Pd: past, present and future" [note by editor]Link #1: https://youtube.com/playlist?list=PLXdYuKtwUhUrirWQ0B2X7XhfrBCGJVlG

A Continuous-Discontinuous Second-Order Transition in the Satisfiability of Random Horn-SAT Formulas

We compute the probability of satisfiability of a class of random Horn-SAT formulae, motivated by a connection with the nonemptiness problem of finite tree automata. In particular, when the maximum clause length is 3, this model displays a curve in its parameter space along which the probability of satisfiability is discontinuous, ending in a second-order phase transition where it becomes continuous. This is the first case in which a phase transition of this type has been rigorously established for a random constraint satisfaction problem

Corrosion Resistance of Silane Coatings on Aluminum and Magnesium Alloys

The purpose of this project was to increase the corrosion resistance of aluminum and magnesium alloys by coating the coupons with a silane on the surface. Four different silanes: 3-aminopropyltriethoxysilane (APTES), Bis(triethoxysilylpropyl)amine (Bis), (Heptadecafluoro-1,1,2,2-tetrahydrodecyl)trichlorosilane (FTS), and (Heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane (non Cl FTS) will be used and compared to see which silane would give the best corrosion resistance. Each silane solution was coated on the coupons by using a solution method in which the coupon was submerged for 24 hours and then thermally cured for another 24 hours. Once the coating was applied, the water contact angle and the thickness of the coating were measured. Then the metal coupons were subject to a corrosion test by immersing them in sodium chloride and oxalic acid solutions for 7 days. The weight loss of the metal coupon was measured after the immersion test. All the silane coatings provided an increased corrosion resistance for aluminum alloy AA2024-T3, and the only silane, APTES, tested on magnesium alloy AZ 31 also significantly reduced its corrosion in both corrosive solutions. The FTS coating provided the best corrosion resistance on the aluminum alloys in an oxalic acid solution and the Bis solution had the best corrosion resistance in the sodium chloride solution. With the addition of a silane coating, aluminum and magnesium alloys used in industry will have an increased corrosion resistance and will increase the life of the part so it will not need to be replaced

Effects and Propositions

The quantum logical and quantum information-theoretic traditions have exerted an especially powerful influence on Bub's thinking about the conceptual foundations of quantum mechanics. This paper discusses both the quantum logical and information-theoretic traditions from the point of view of their representational frameworks. I argue that it is at this level, at the level of its framework, that the quantum logical tradition has retained its centrality to Bub's thought. It is further argued that there is implicit in the quantum information-theoretic tradition a set of ideas that mark a genuinely new alternative to the framework of quantum logic. These ideas are of considerable interest for the philosophy of quantum mechanics, a claim which I defend with an extended discussion of their application to our understanding of the philosophical significance of the no hidden variable theorem of Kochen and Specker.Comment: Presented to the 2007 conference, New Directions in the Foundations of Physic

Drug-like Properties and Fraction Lipophilicity Index as a combined metric

Fraction Lipophicity Index (FLI) has been developed as a composite drug-like metric combining logP and logD in a weighted manner. In the present study an extended data set confirmed the previously established drug-like FLI range 0-8 using two calculation systems for logP /logD assessment, the freeware MedChem Designer and ClogP. The dataset was split into two classes according to percentage of fraction absorbed (%FA) - class 1 including drugs with high to medium absorption levels and class 2 including poorly absorbed drugs. The FLI and FLI© (ClogP based FLI) drug-like range covers 93% and 90 % of class 1 drugs, respectively. The dependence of the degree of ionization to intrinsic lipophilicity within the FLI (FLI©) drug-like range as well as the inter-relation between the other Ro5 properties (Mw, HD, HA) was explored, so as to define drug-like / non drug-like combinations as a safer alternative to single properties for drug candidates’ prioritization. In this sense we propose a combined metric of Mw and number of polar atoms (Mw/NO) to account for both size and polarity. Setting the value 50 as cut off, a distinct differentiation between class 1 and class 2 drugs was obtained with Mw/NO>50 for more than 70% of class 1 drugs, while the opposite was observed for class 2 drugs