פרסומים

Appeared also as ’Israel Affairs’ 5,2-3 (1999).

An improved approximation to the time-dependent Schrodinger equation is developed by correcting the time-dependent self-consistent field ansatz with a Jastrow prefactor defined via a set of variationally determined time-dependent parameters and a linearly independent set of prespecified spatial functions. The method is applicable in any number of dimensions, conserves norm and energy, is without parametric singularities, possesses an internal estimate of the accuracy, and has computational costs that scale algebraically with the number of degrees of freedom. The new formalism is applied to a two-dimensional double well potential to demonstrate the improved accuracy of the method. An extension of the method to electronically nonadiabatic problems is also presented. (C) 1999 American Institute of Physics. [S0021-9606(99)01616-5].

There is no denying the political and secular rather than religious nature of the Parisian Fronde of 1648-52, but religious symbols and vocabulary were nevertheless recruited by the rival camps that confronted each other during the civil war. Between 1649 and 1652, more than fifty Parisian Mazarinades invoked saints, angels, and hermits, imploring these divine protectors to save the city from Mazarin and to reunite the city with its God. Patron saints of Paris and of France were also implored in public processions of penance and in communal invocations. Examining these Mazarinades, as well as some devotional public rituals that took place in the city during these years, the article addresses the mobilization of religious sentiments during the Fronde. It argues that for contemporary Parisians, some Mazarinades were assumed to address issues that were both religious and political. The use of religious lexicon and rituals by the Frondeurs had a nostalgic component; it was an attempt to r

We demonstrate the fabrication and characterization of LED device based on self-assembled films of (PVPy/SPS) where PVPy stands for Poly(4-vinyl pyridine) with additional transport layers such as poly-vinyl-carbazole (PVK) and 2-(4-biphenylyl)-5-(4-tertbutyphenyl) -1,3,4-oxidiazole (PBD). The self-assembly is based on the electrostatic interaction; the charge on PVPy is generated by the protonation process. The EL properties of the device ITO/PVK/(PVPy/SPS)/Al and ITO/(PVPy/SPS)/PBD/Al are measured and discussed.

By the end of oocyte development, the ovaries of Penaeus semisulcatus have accumulated almost equal amounts (approximately 16 mg lipid g-1 protein) of phospholipids and triacylglycerols. The phospholipids consist mainly of phosphatidylcholine (75-80 %) and phosphatidylethanolamine (20-25 %). Approximately 30 % of the total fatty acid content of both phospholipids and triacylglycerols is made up of polyunsaturated fatty acids. In fractions obtained by centrifugation of ovarian homogenates, most of the increase in levels of ovarian lipids during ovarian maturation was associated with an increase in triacylglycerol levels in the floating fat fraction and of phospholipids in the infranatant fraction. The presence of polyunsaturated fatty acids in the ovaries indicates the occurrence of lipid transport to the ovary during oocyte maturation. The gradual decrease in the relative abundance of polyunsaturated fatty acids as the ovaries matured supports previously published results suggesting intra-ovarian synthesis of saturated and mono-unsaturated fatty acids. Most of the lipids found in the female haemolymph (64.8 %) were recovered in the high-density lipoprotein fraction after density ultracentrifugation. The haemocyanin fraction recovered from this stage of fractionation contained substantial amounts of lipid (16.8 %) that could be removed by further sequential centrifugation at a higher NaBr density, leaving less than 0.9 % of the total haemolymph lipids associated with this fraction. While 16.2 % of the lipids were recovered from the very high-density lipoprotein fractions, these lipoproteins carried only 64-89 microg lipid mg-1 protein compared with 538.9 microg lipid mg-1 protein in the high-density lipoprotein fraction, indicating that the high-density lipoproteins are more likely to be the main transporters of lipids to the ovary. However, the contribution of very high-density lipoproteins to lipid transport cannot be ruled out at this stage. In this study, we present two models for lipid transport to the ovary based on the abundance of phospholipids and triacylglycerols in the haemolymph and on the amounts of polyunsaturated fatty acids accumulated within the ovary during vitellogenesis.