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排序方式: 共有123条查询结果,搜索用时 18 毫秒
31.
O. Louren?o M. Dutra R. L. P. G. Amaral Antonio Delfino 《Brazilian Journal of Physics》2012,42(3-4):227-236
In this work, we show how nonlinear point-coupling models, described by a Lagrangian density containing only terms up to fourth order in the fermion condensate $(\bar{\psi}\psi)$ , are derived from a modified meson-exchange nonlinear Walecka model. We present two methods of derivation, namely the hypermassive meson limit within a functional integral approach and the mean-field approximation, in which equations of state at zero temperature of the nonlinear point-coupling models are directly obtained. 相似文献
32.
D. Decamp B. Deschizeaux C. Goy J. -P. Lees M. -N. Minard R. Alemany J. M. Crespo M. Delfino E. Fernandez V. Gaitan et al. 《Zeitschrift fur Physik C Particles and Fields》1992,54(1):75-85
This paper describes a study of Bose-Einstein correlations made using the ALEPH detector at LEP. The correlations are found to enhance the two particle differential cross section for pairs of identical pions by a factor which can be roughly parametrized byR(Q)=1+ exp(-Q22), whereQ is the difference in the 3-momenta of the two pions in their centre of mass frame, =0.51±0.04±0.11 and =3.3±0.2±0.8 GeV–1, which corresponds to a source size of 0.65±0.04±0.16 fm. The large systematic errors on these results reflect their strong dependence on the choice of the reference sample used in the analysis. This problem is believed to occur primarily because of uncertainties in the rates of resonance production and a lack of knowledge about the pion-pion strong interaction. No significant correlations are seen amongst like-charged pion-kaon pairs.Supported by CAICYT, Spain 相似文献
33.
Ford WT Qi N Read AL Smith JG Camporesi T De Sangro R Peruzzi I Piccolo M Hurst RB Pyrlik J Venuti JP Weinstein R Gettner MW Goderre GP Sleeman JC von Goeler E Chadwick GB Leedy RE Messner RL Moss LJ Muller F Nelson HN Ritson DM Rosenberg LJ Wiser DE Zdarko RW Groom DE Verdini PG Band HR Delfino MC Johnson JR Lavine TL Maruyama T Prepost R 《Physical review D: Particles and fields》1989,40(5):1385-1396
34.
Staimer N Delfino RJ Bufalino C Fine PM Sioutas C Kleinman MT 《Analytical and bioanalytical chemistry》2005,383(6):955-962
A personalized, miniaturized air sampling system was evaluated to estimate the daily exposure of pediatric asthmatics to nitrogen
dioxide (NO2). The lightweight device (170 g) uses a sampling pump connected to a solid sorbent tube containing triethanolamine (TEA)-impregnated
molecular sieve. The pump is powered by a 9 V battery and samples air over a 24 h period at a collection rate of 0.100 L/min.
After exposure, the solid sorbent is removed from the tubes for spectrophotometric analysis (Griess Assay). The lower detection
limit of the overall method for NO2 is 11 μg/m3. The linearity, precision and accuracy of the sampler was evaluated. Different NO2 concentrations generated in the laboratory (range: 50 to 340 μg/m3) were simultaneously measured by the TEA tube samplers and colocated continuous chemiluminescent NOx analyzers (reference method). The coefficient of determination for the laboratory test derived from ordinary linear regression
(OLR) was r
2=0.99 (y
OLR=0.94x−4.58) and the precision 3.6%. Further, ambient NO2 concentrations in the field (range: 10–120 μg/m3) were verified with continuous chemiluminescent monitors next to the active samplers. Reweighted least squares analysis (RLS)
based on the least median squares procedure (LMS) resulted in a correlation of r
2=0.68 for a field comparison in Riverside, CA (y
RLS=1.01x−0.94) and r
2=0.92 in Los Angeles, CA (y
RLS=1.31x−7.12). The precision of the TEA tube devices was 7.4% (at 20–60 μg/m3 NO2) under outdoor conditions. Data show that the performance of this small active sampling system was satisfactory for measuring
environmental concentrations of NO2 under laboratory and field conditions. It is useful for personal monitoring of NO2 in environmental epidemiology studies where daily measurements are desired. 相似文献
35.
36.
Fernandez E Ford WT Qi N Read AL Smith JG Camporesi T De Sangro R Marini A Peruzzi I Piccolo M Ronga F Blume HT Hurst RB Venuti JP Wald HB Weinstein R Band HR Gettner MW Goderre GP Meyer OA Moromisato JH Polvado RO Shambroom WD Sleeman JC von Goeler E Ash WW Chadwick GB Clearwater SH Coombes RW Kaye HS Lau KH Leedy RE Lynch HL Messner RL Moss LJ Muller F Nelson HN Ritson DM Rosenberg LJ Wiser DE Zdarko RW Groom DE Lee HY Delfino MC Heltsley BK Johnson JR Lavine TL Maruyama T Prepost R 《Physical review letters》1985,54(11):1118-1121
37.
38.
Electrochemical Oxidation of the Antiretroviral Drug Nelfinavir on Modified Screen‐printed Electrodes 下载免费PDF全文
Laura Asturias‐Arribas Mario Raúl Delfino M. Asunción Alonso‐Lomillo Olga Domínguez‐Renedo M. Julia Arcos‐Martínez 《Electroanalysis》2016,28(9):2081-2086
This paper describes the voltammetric study of the electrochemical oxidation of the antiretroviral drug Nelfinavir using a screen‐printed sensor modified with carbon nanotubes. The performance of the sensor in the determination of the drug was characterized in terms of precision (RSD 5.05 %, n=5) and capability of detection (10.99±0.87 μM for α=β=0.05, n=5) under optimized voltammetric conditions of pH, accumulation time and potential, in the calibration range from 10 to 150 μM of NFV. In order to check the viability of the device, the determination of the analyte in pharmaceutical and biological samples was carried out and its performance was also validated comparing it with HPLC. 相似文献
39.
Clusters and droplets of positive spins in the two-dimensional Ising model percolate at the Curie temperature in absence of external field. The percolative exponents coincide with the magnetic ones for droplets but not for clusters. We use integrable field theory to determine amplitude ratios which characterize the approach to criticality within these two universality classes of percolative critical behavior. 相似文献
40.
Extensive new high-temperature, high-resolution FTIR emission spectroscopy measurements for the five common isotopomers of GeO are combined with previous diode laser and microwave measurements in combined isotopomer analyses. New Dunham expansion parameters and an accurate analytical potential energy function are determined for the ground X1Sigma+ state. Copyright 1999 Academic Press. 相似文献