Detection of low energy solar neutrinos with HPGermanium

The potential of the GENIUS proposal [1] to measure the spectrum of low energy solar neutrinos in real time is studied. The detection reaction is elastic neutrino-electron scattering 9 + e M 9 + e. The energy resolution for detecting the recoil electrons is about 0.3%, the energy threshold is a few keV. The expected number of events for a target of one ton of natural germanium is 3.6 events/day for pp-neutrinos and 1.3 events/day for ⁷Be-neutrinos, calculated in the standard solar model (BP98 [2]). It should be feasible to achieve a background low enough to measure the low energy solar neutrino spectrum.     

[Bis(tetrahydrofuran–O)–bis(1,3–dialkyl–2–diphenylphosphanyl–1,3–diazaallyl)calcium] – Synthesis and Crystal Structures of Calcium Bis[phospha(III)guanidinates] and Investigations of Catalytic Activity

The reaction of [(thf)₄Ca(PPh₂)₂] ( 1 ) with diisopropyl– and dicyclohexylcarbodiimides yields the phospha(III)guanidinates [(thf)₂Ca{RNC(PPh₂)NR}₂] with R = isopropyl ( 2 ) and cyclohexyl ( 3 ). The metathesis reaction of K{RNC(PPh₂)NR} with anhydrous CaI₂ also allows the synthesis of these phospha(III)guanidinate complexes 2 and 3 . For 2 a cis arrangement is observed whereas 3 crystallizes as trans isomer. The phospha(III)guanidinates act as bidentate chelate bases with an average Ca–N distance of 242.5 pm. The C–P bond length between the PPh₂ fragment and the 1,3–diazaallyl unit is with values above 190 pm very large. The complexes 2 and 3 show a moderate catalytic activity in hydrophosphanylation reactions of dialkylcarbodiimides with diphenylphosphane.     

Asymptotic partition of energy in micropolar mixture theory of porous media

The aim of this paper is to study the asymptotic partition of the energy associated with the solution of the initial-boundary value problem who describes the behavior of binary homogeneous micropolar mixtures of an isotropic micropolar elastic solid with an incompressible micropolar viscous fluid. Some Lagrange-Brun identities are established. Using the Cesáro means of various parts of total energy, the relations that describe the asymptotic behavior of mean energies are established. The author acknowledges support from the Romanian Ministry of Education and Research through CEEX program, contract CERES-2-CEx06-11-12/25.07.2006.     

Analysis of the neutralino system in supersymmetric theories

Charginos and neutralinos in supersymmetric theories can be produced copiously at colliders and their properties can be measured with high accuracy. Consecutively to the chargino system, in which the SU(2) gaugino parameter , the higgsino mass parameter and can be determined, the remaining fundamental supersymmetry parameter in the gaugino/higgsino sector of the minimal supersymmetric extension of the Standard Model, the U(1) gaugino mass , can be analyzed in the neutralino system, including its modulus and its phase in CP–noninvariant theories. The CP properties of the neutralino system are characterized by unitarity quadrangles. Analytical solutions for the neutralino mass eigenvalues and the mixing matrix are presented for CP–noninvariant theories in general. They can be written in compact form for large supersymmetric mass parameters. The closure of the neutralino and chargino systems can be studied by exploiting sum rules for the pair-production processes in collisions. Thus the picture of the non–colored gaugino and higgsino complex in supersymmetric theories can comprehensively be reconstructed in these experiments. Received: 24 August 2001 / Published online: 21 November 2001     

Stability and robustness properties of a class of discrete–time residual generators

The aim of this paper is to present a design methodology for an observer–based fault detection filter. This approach allows to compute a filter gain such that both fault detection and disturbance attenuation requirements are accomplished. The developments are based on H_∞ optimization in the discrete–time framework. The existence conditions for the observer–based detection filter are expressed in terms of feasibility of a system of matrix inequalities. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)     

Weak ac field-induced patterns in vertical deposition of colloids at various evaporation rates

The European Physical Journal Special Topics - Pattern formation in colloids by weak ac fields in vertical deposition-like configuration at different temperatures has been studied experimentally....     

Pharmacokinetic study of ofloxacin enantiomers in Pagrosomus major by chiral HPLC

(S)‐(?)‐Ofloxacin and (R)‐(+)‐ofloxacin concentrations in the plasma of Pagrosomus major after drug treatment were detected by chiral high‐performance liquid chromatography, and various pharmacokinetic parameters were calculated from these data. The elimination half‐life of (S)‐(?)‐ofloxacin was significantly shorter than that of the (R)‐(+) enantiomer. (S)‐(?)‐Ofloxacin also had a significantly lower maximum plasma concentration, area under the concentration–time curve from zero to infinity, and mean residence time than (R)‐(+)‐ofloxacin. However, the apparent volume of distribution and total body clearance of (S)‐(?)‐ofloxacin were greater than those of (R)‐(+)‐ofloxacin. The ratio of the (S)‐(?)‐ to (R)‐(+)‐ofloxacin plasma concentration was always <1.0. Together, these data suggest that (S)‐(?)‐ofloxacin was preferentially excreted and (R)‐(+)‐ofloxacin was preferentially absorbed. Although the difference in pharmacokinetic parameters was small, the metabolic behavior of the ofloxacin enantiomers in P. major was enantioselective. Copyright © 2015 John Wiley & Sons, Ltd.     

Dissociation and kinetic of hydrochloric acid in mixed isomeric alcoholic-aqueous solvents — A conductance study

The effect of water and the effect of time on the conductance behavior of dilute solutions of hydrochloric acid in n-butanol–water and iso-butanol–water mixtures with the alcohol percentages; 97.00%, 97.50%, 98.00%, 98.50%, 99.00%, 99.50%, 99.70% and 99.98% at 298 K are reported. The data were analysed with a computer program for the Lee–Wheaton conductivity equation. The molar conductance (Λ), limiting molar conductance (Λ₀), dissociation constants (K_d), and the standard free energy of dissociation (?G^°_d) were calculated and discussed. The kinetic of hydrochloric acid conductance was also discussed and the results showed a first order interaction between HCl and the alcoholic solvents. In agreement with previous experiments in alcohol–water mixtures the limiting molar conductance decreases when water is added to the alcohol and then increases again. The results show that, the dissociation constant decreased as the relative permittivity of the solvent decreased.