Showing papers by "Bar-Ilan University published in 1975"
TL;DR: In this paper, the critical behavior of systems having a multicritical point of a new type, hereafter called a Lifshitz point, was calculated for anisotropic and isotropic systems.
Abstract: We calculate the critical behavior of systems having a multicritical point of a new type, hereafter called a Lifshitz point, which separates ordered phases with $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}=0$ and $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}\ensuremath{
e}0$ along the $\ensuremath{\lambda}$ line. For anisotropic systems, the correlation function is described in terms of four critical exponents, whereas for isotropic systems two exponents suffice. Critical exponents are calculated using an $\ensuremath{\epsilon}$-type expansion.
590 citations
99 citations
TL;DR: Observations suggest that the mesolimbic dopaminergic projections mediate some of the behavioral and visceral effects of d-amphetamine.
74 citations
57 citations
TL;DR: It is suggested that during periods of highly active epinephrine-induced glycogenolysis in muscle, the Glc-1,6-P2, produced by the cyclic AMP-stimulated reaction of phosphofructokinase with glucose 1-phosphate, will release the phosphoglucomutases from ATP or citrate inhibition, and will depress the activity of muscle type II hexokinase.
47 citations
TL;DR: The critical exponents at a general Lifshitz point are calculated in the spherical model limit as mentioned in this paper, as well as those of an isotropic Lifhitz point to O(1/n ).
44 citations
TL;DR: In this article, a theory of the resonant x-ray Raman effect is presented and compared with recent experimental data of Sparks, and the potential importance of this newly discovered spectroscopic probe is discussed.
Abstract: A theory of the resonant x-ray Raman effect is presented and compared with recent experimental data of Sparks. Excellent agreement between theory and experiment is found for the integrated intensity of the scattering, the spectral density, and the output polarization. The potential importance of this newly discovered spectroscopic probe is discussed.
41 citations
TL;DR: In the series of fetal loss, positive microbiologic findings from the fetal organs seemed correlated to prolonged bleeding before abortion or labor and to premature rupture of membranes.
41 citations
TL;DR: In this paper, a microscopic calculation of the memory function of the velocity autocorrelation function in a classical one-component plasma was performed, and the self-diffusion coefficient as a function of density was calculated.
Abstract: We perform a microscopic calculation of the memory function of the velocity autocorrelation function in a classical one-component plasma. Our theory yields oscillatory behavior in the velocity autocorrelation function consistent with recent molecular-dynamics computations. We also calculate the self-diffusion coefficient as a function of density.
34 citations
TL;DR: The paper gives a complete semantics for a wide class of tense predicate logics and ultraproducts of tense structures are further defined and are applied to prove compactness and the Craig interpolation theorem.
28 citations
TL;DR: In this paper, the energies and intensities of satellite bands in the X-ray photoelectron spectrum of formaldehyde have been calculated using molecular wave functions obtained from a combination of multi-configuration self-consistent field theory and configuration-mixing formalism.
TL;DR: The structure of carotenoids of Valencia orange juice were elucidated by chemical tests and MS of the free pigments and their derivatives as discussed by the authors, and a new apocarotenal was shown to be 3-hydroxy-5-8-epoxy-5,8-dihydro-8′-apo-β-caroten-8.8′ al.
TL;DR: The findings show that for both sexes, groups take significantly greater risks than individuals even when risk taking is mediated by aggressive means.
Abstract: This study set out to investigate whether the risky shaft found in group consensus decisions as compared to group members' personal decisions extends to situations that combine risk and aggression. In a between-subjects design, subjects were exposed, either alone or as members of unisex triads, to an experimental task in which the risk entailed severe noxious consequences. The findings show that for both sexes, groups take significantly greater risks than individuals even when risk taking is mediated by aggressive means. The results are seen and discussed as limiting the explanatory scope of the risk-as-a-value hypothesis and as more consistent with the diffusion of responsibility hypothesis. Language: en
TL;DR: In this article, a necessary condition on the moduli of the zeros of a boolean function is obtained, which is the best possible for any function f(z), analytic in the unit disc.
Abstract: The functionf(z), analytic in the unit disc, is inA
p if
$$\int {\int {_{\left| z \right|< 1} \left| {f(z)} \right|^p dxdy< \infty } } $$
. A necessary condition on the moduli of the zeros ofA
p functions is shown to be best possible. The functionf(z) belongs toB
p if
$$\int {\int {_{\left| z \right|< 1} \log ^ + \left| {f(z)} \right|)^p } } $$
. Let {z
n } be the zero set of aB
p function. A necessary condition on |z
n | is obtained, which, in particular, implies that Σ(1−|z
n |)1+(1/p)+g
0 (p≧1). A condition on the Taylor coefficients off is obtained, which is sufficient for inclusion off inB
p. This in turn shows that the necessary condition on |z
n | is essentially the best possible. Another consequence is that, forq≧1,p
TL;DR: A sensitive gas chromatographic method for the measurement of the biologically significant quaternary ammonium compound, carnitine was developed, based upon decomposition of the compound upon heating at 160°C, in the presence of NaOH and NaBH 4.
TL;DR: The composition of the cell membrane from different age groups of reticulocytes separated by differential floatation through phtalate oil, and to compare the gel electrophoresis obtained to those obtained from mature is investigated.
TL;DR: In this article, a new method for choosing the rotation angle in the usual indirect localization procedure consisting of the iterative use of 2 × 2 rotation matrices is suggested, which converges much more quickly and to a significantly better numerical value of the localization criterion than previous methods.
TL;DR: The results of this study suggest that the activity of the adenylate cyclase may be dependent on the membrane-bound phospholipids and that the enzyme attached to the mitochondrial membranes has some properties which are similar to theadenylates cyclase found to be associated with other membrane systems of the cell.
TL;DR: The hypothesis tested was that authoritarian personalities prefer the natural sciences (specifically biology and chemistry) and nonauthoritarian personalities choose the social sciences and humanities as discussed by the authors, and the results strongly supported the hypothesis.
TL;DR: In this article, the authors investigated the relationship of discrimination to interaural temporal asymmetry and showed that the left segment of this function, decreasing as Δt increases from 2 to 8 msec, crosses the 75% discrimination level at a dichotic temporal separation of 6 msec and reflects the breakup of the fused stimulus.
Abstract: Several phenomena are associated with a monotonic increase in interaural temporal asymmetry (Δt) of equally intense auditory stimuli: lateralization of a fused stimulus in the direction of the lead ear, when Δt is in the microsecond range, the subsequent breakup of the fused stimulus with Δt in the millisecond range, followed by temporal order judgments at Δts longer than 20 msec. Two of these binaural phenomena are investigated, using the same experimental paradigm: the breakup of the fused sound into two separately perceived stimuli and the judgment of temporal order. A V-shaped function describes the relationship of discrimination to interaural temporal asymmetry. The left segment of this function, decreasing as Δt increases from 2 to 8 msec, crosses the 75% discrimination level at a dichotic temporal separation of 6 msec and reflects the breakup of the fused stimulus. The right segment of this function, increasing from 12 to 128 msec, crosses the 75% discrimination level at a dichotic temporal separation of 18 msec, reflecting temporal order discrimination. The data are discussed in terms of the literature on temporal order judgments, and considered in terms of an overall framework which assumes that all of the phenomena which occur as a function of increased Δt result from different processing operations on the temporal continuum separating the dichotic stimuli (Sternberg & Knoll, 1973).
TL;DR: The tail of a rat is one of the major effector organs in thermoregulation, aiding it to overcome excessive environmental heat and serves as a temperature-sensing organ, and d-Amphetamine treatment enhances the hyperthermia induced by the tail's exposure to cold temperature and causes an impairment of thetail's thermal sensory role.
TL;DR: The highest spore production of Stemphylium botryosum f.lycopersici on tomato leaves during a 24-h wetting period occurred in continuous darkness, and ofAlternaria porri f.
Abstract: The highest spore production ofStemphylium botryosum f. sp.lycopersici on tomato leaves during a 24-h wetting period occurred in continuous darkness, and ofAlternaria porri f. sp.solani on potato leaves in a 12-h dark period which had been preceded by a 12-h light period. Sporulation of both pathogens was inhibited by illumination during the entire wetting period or during the last 12 h of it. In inhibitory conditions spore yield increased with a decrease in the incubation temperature and as tested withA. porri f. sp. solani, also with lowered light intensity.
TL;DR: In this article, it was demonstrated that there is excellent agreement between the low-temperature electrical resistivity data for potassium and the Bailyn formulation for the phonon-drag electrical resistivities.
TL;DR: In this paper, the transverse dielectric constant of a crystal from liquid N 2 to room temperature was measured using the Blinc-de-Gennes model in conjunction with a cluster approximation.
TL;DR: In this paper, the absorption spectrum of polycrystalline ethylene was studied in the region of 250-150 nm and the Rydberg π → 3s lines disappeared in the solid and the band structure of the N → V transition extended beyond the maximum.
TL;DR: It is demonstrated that there is a two step action of Valinomycin, at 10-6M and below the drug has no effect on the 42K exchange, but it stops, however reversibly, protein synthesis.
Abstract: In this work we consider the differential effect of Valinomycin used at different concentrations both on the protein synthesis of reticulocytes and on 42K exchange. We demonstrate that there is a two step action of this antibiotic. At 10-6M and below the drug has no effect on the 42K exchange, but it stops, however reversibly, protein synthesis. At 10-5M the drug has a very sharp action on the 42K exchange and stops protein synthesis in an irreversible way.