bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrating expanded school mental health programs and school‐based health centers
Authors: Weist Mark D. , Goldstein Amy , Morris Leslie , Bryant Tanya 
Published: March 2003

AbstractThis article provides background on national movements toward expanded school mental health (ESMH) programs and school‐based health centers (SBHCs), and presents advantages and challenges of joining these two systems of child and adolescent health care. Delivering ESMH through SBHCs promotes an interdisciplinary approach, health–mental health care integration, and benefits including enhancing referral bases, improving screening of problems, and enhanced confidentiality and privacy. But this integrated approach also presents challenges including managing referrals and significant needs, handling crises, building a focus on prevention and mental health promotion, handling administrative demands, and coping with limited resources. These challenges, ideas for overcoming them, and future directions for this promising service delivery approach are discussed. © 2003 Wiley Periodicals, Inc. Psychol Schs 40: 297–308, 2003.
Evaluation in school‐based health centers
Authors: Nabors Laura A. 
Published: March 2003

AbstractSchool‐Based Health Centers (SBHCs) are ideal primary care settings for improving children's access to and utilization of health care services. In this era of shrinking funding for social service programs, SBHCs may provide services to youth from low‐income families, who otherwise might lack access to health care services. However, the growth of SBHCs has outpaced evaluation efforts. More information is needed about what services are being provided, and for whom services are effective. This article reviews information that will assist in the development of evaluation efforts for SBHCs. A review of evaluation theory, ideas for evaluation in SBHCs, challenges to implementing research in schools, and future directions for evaluation efforts are presented. © 2003 Wiley Periodicals, Inc. Psychol Schs 40: 309–320, 2003.
Electronic properties of new quasi‐two‐dimensional organic conductors (BEDO‐TTF)5[MHg(SCN)4]2 (M = Rb, Cs) studied by IR reflectance spectroscopy at temperatures down to 10 K
Authors: Drichko N. V. , Vlasova R. M. , Semkin V. N. , Bogdanova O. A. , Zhilyaeva E. I. , Lyubovskaya R. N. , Lyubovskii R. B. , Graja A. 
Published: March 2003

AbstractPolarized reflectivity and optical conductivity spectra of new quasi‐two‐dimensional organic conductors (BEDO‐TTF)5[MHg(SCN)4]2, where M = Rb, Cs, are studied over the spectral range 700–6500 cm–1 at temperatures between 10 and 300 K. The Rb salt shows metallic behavior over the whole measured spectral and temperature range. For the Cs salt an unusual anisotropy of changes in the spectra of the conducting plane is observed with decreasing temperature. At low temperature this salt exhibits metallic behavior in the direction perpendicular to the BEDO‐TTF stacks, but non‐metallic behavior in the direction parallel to the stacks. This anisotropy is confirmed by dc conductivity measurements. It is supposed that the non‐metallic behavior is due to a dimerization of the BEDO‐TTF molecules in the stacks at low temperature. The appearance of new bands in the vibrational spectra gives evidence for this interpretation. The ordered structure of the anion layers of the Cs salt is a reasonable cause of the dimerization.
The spectral luminescence characteristicsof RbPbCl3 : Cs crystals in the 4–20 eV region
Authors: Voloshinovskii A. , Myagkota S. , Gloskovskii A. , Garapyn I. 
Published: March 2003

AbstractInvestigations of luminescence kinetics properties of CsPbCl3 microcrystals dispersed in RbPbCl3 matrices have been carried out under excitation with synchrotron radiation in the energy region Eexc = 4–20 eV. Different time components are registered in the decay kinetics of CsPbCl3 microcrystals, appearing due to the direct excitation of the microcrystals or reabsorption of the intrinsic emission of the RbPbCl3 matrix. A shortening of the luminescence decay time of the CsPbCl3 microcrystals with respect to that observed for a CsPbCl3 single crystal can be explained as evidence of the quantum size effect.
ZrAg and Zr2Ag phases studiedby perturbed angular correlation with 181Ta probes
Authors: Wodniecki P. , Wodniecka B. , Kulińska A. 
Published: March 2003

AbstractThe electric quadrupole hyperfine interactions for 181Hf/181Ta probes in polycrystalline ZrAg and Zr2Ag were measured in the temperature range 24–1100 K and compared with the results of previous experiments on isostructural Hf–Ag compounds. For both phases one unique quadrupole frequency νQ with asymmetry parameter η = 0 was observed in accordance with the B11 and C11b structures of the ZrAg and Zr2Ag phases, respectively. On the basis of the chemical similarities of Zr and Hf, the 181Hf probes can be considered as the constituent atoms in Zr–Ag alloys. In both matrices they were found to substitute the Zr site.
On the influence of non‐nearest neighbor interactions and anharmonicity on the atomic properties of a crystal surface: one‐dimensional model
Authors: Rabelo J. N. T. , Zubov V. I. , da Silva A. L. C. 
Published: March 2003

AbstractWe describe self‐consistently the effects of non‐nearest neighbor interactions and anharmonicity on the atomic properties of a crystal surface. An approach is developed based on the unsymmetrized self‐consistent field approximation (USF). The structural dynamical and thermodynamic properties of a semi‐infinite linear chain are studied in the classical limit. Expressions for the lattice relaxation in the vicinity of the surface the mean‐squared atomic displacements and for the surface energy and free energy are obtained. Quantitative estimates were made using the Lennard–Jones 6–12 interatomic potential.
Solid‐phase precipitation of CdTe nanoparticles in glass
Authors: Yükselici M. H. , Allahverdi Ç. 
Published: March 2003

AbstractGrowth of CdTe nanoparticles in glass is studied through the analysis of optical absorption spectroscopy with the help of a quantized state effective mass model. Glass includes nanoparticles with an initial size of ∼1.6 nm on cooling to room temperature from the melt at ∼1000 °C. Particles form by heterogeneous nucleation followed by diffusion‐limited growth. The narrowest particle size dispersion of 15% is obtained for an average radius of ∼2.28 nm at the end of heat treatment at 600 °C for 4.5 h. The magnitude of the absorption related to the number of particles is low due to the oxidation of Te. A combinative use of Arrhenius plots and the model yields an activation energy for diffusion of ∼170 kJ mol–1.
Effective conductivity in a lattice model for binary disordered media with complex distributions of grain sizes
Authors: Piasecki R. 
Published: March 2003

AbstractUsing numerical simulations and analytical approximations we study a modified version of the two‐dimensional lattice model [R. Piasecki, phys. stat. sol. (b) 209, 403 (1998)] for random pH : (1–p) L systems consisting of grains of high (low) conductivity for the H‐(L‐)phase, respectively. The modification reduces a spectrum of model bond conductivities to the two pure ones and the mixed one. The latter value explicitly depends on the average concentration γ(p) of the H‐component per model cell. The effective conductivity as a function of content p of the H‐phase in such systems can be modelled making use of three model parameters that are sensitive to both grain size distributions, GSD(H) and GSD(L). However, to incorporate into the model information directly connected with a given GSD, a computer simulation of the geometrical arrangement of grains is necessary. By controlling the polydispersity in grain sizes and their relative area frequencies, the effective conductivity could be raised or decreased and correlated with γ(p). When the phases are interchanged, a hysteresis‐loop‐like behaviour of the effective conductivity, characteristic of dual media, is found. We also show that the topological non‐equivalence of the system's microstructure accompanies some GSDs, and it can be detected by the entropic measure of the spatial inhomogeneity of model cells.
Lippmann‐Schwinger equation approach to scattering in quantum wires
Authors: Vargiamidis Vassilios , Valassiades O. , Kyriakos D. S. 
Published: March 2003

AbstractWe apply the Lippmann‐Schwinger equation for obtaining the scattering amplitudes and conductance as a function of Fermi energy for electrons scattering from one and two point defects in a two‐dimensional quantum wire. Further, we discuss the first and higher‐order Born approximation to the scattering wave function and show that keeping five terms in the Born series can lead to a convergent wave function (except for Fermi energy close to the subband energy where it naturally diverges). It has been stated previously that electron transmission through a single point defect in a quantum wire is perfect at every subband minima independent of where the scatterer is located. However, here we demonstrate that perfect transmission at subband minima is strongly affected by the transversal position of the defect. In particular, we show that the perfect transparency effect is modified when the scatterer is located at the nodes of a normal confinement mode.
Pressure dependence of structural phase transition and superconducting transition in CsI
Authors: Nirmala Louis C. , Iyakutti K. 
Published: March 2003

AbstractThe self‐consistent band structure calculation for CsI performed both in CsCl and HCP structures using the TB‐LMTO method is reported. The equilibrium lattice constant, bulk modulus and the phase‐transition pressure at which the compound undergoes structural phase transition from CsCl to HCP are predicted from the total‐energy calculations. The band structure, density of states (DOS), electronic charge distributions, metallization and superconducting transition temperature (Tc) of CsI are obtained as a function of pressure for both the CsCl and HCP structures. It is found that the charge transfer from s and p states to d state causes metallization and superconductivity in CsI. The highest Tc estimated is 2.11 K and the corresponding pressure is 1.8 Mbar. This value is in agreement with the recent experimental observation. The experimental trend – “metallization and superconductivity is rather insensitive to the crystal structure of CsI” – is also confirmed in our work.
The behavior of the 180° domain walls in disordered dielectrics like KTaO3 : Li and KTaO3 : Nb
Authors: Stephanovich Vladimir , Sobolewska Aneta 
Published: March 2003

AbstractWe calculate the structure of 180° domain wall in disordered ferroelectrics with random site electric dipoles (i.e. those like K1–xLixTaO3, KTa1–xNbxO3, where Li+ or Nb5+ are off‐center ions forming impurity dipoles). The calculation is performed on the base of the free energy functional of disordered dielectrics derived earlier [M. D. Glinchuk et al., Phase Transit., 2003 (to be published)] within the framework of a random field method. We obtain the domain wall thickness as a function of impurity dipole concentration n and temperature T. It is shown that in disordered ferroelectrics the domain wall is usually broader than in their ordered counterparts. The thickness increases infinitely near the phase transition temperature, which depends on the impurity dipoles concentration.
X‐ray study of the polarization of the Cu‐cations in CuBr
Authors: Almukhametov R. F. , Yakshibayev R. A. , Abdullin A. R. , Kutusheva R. M. 
Published: March 2003

AbstractThe intensities of the X‐ray lines for Cu+‐cationic conductor CuBr were studied depending on polarization under an electric field. The regular variation in the intensity depending on direction as well as polarization degree was established. A satisfactory agreement was shown for experimental integral intensities depending on copper cation number in the unit cell and those calculated obtained under the condition that all the Cu‐cations in the unit cell are mobile and occupy the tetrahedral sites. The redistribution of the copper cations on tetrahedral sites under the polarization electric field was established.
Ordering in undoped hexagonal AlxGa1–xN grownon sapphire (0001) with 0.09 < x < 0.247
Authors: Laügt M. , Bellet‐Amalric E. , Ruterana P. , Omnès F. 
Published: March 2003

AbstractIn this issue's Editor's Choice [1], multiple ordering in AlxGa1–xN grown by low pressure metal‐organic vapor phase epitaxy on sapphire is observed by comprehensive high resolution X‐ray diffraction as well as transmission electron microscopy investigations.The cover figure shows a detail of the reciprocal space map taken on a AlxGa1–xN (x = 0.167) sample in the vicinity of the &#38;1macr; 0 1 30 spot. The sapphire asymmetric reflection &#38;1macr; &#38;1 macr; 2 12 is also visible. It is concluded that besides the disordered alloy, an ordered phase with two consecutive AlN monolayers in a 3.1 nm large unit cell is present.The first author, Marguerite Laügt, is a researcher at the Centre de Recherche sur l'Hétéro‐Epitaxie et ses Applications of the CNRS at Parc de Sophia Antipolis.
Analysing pharmacokinetic drug interaction or comparability studies with missing values in crossover design
Authors: Wei Lynn , Zhang Ji , Larson Patrick 
Published: March 2003

AbstractIn a pharmacokinetic drug interaction study using a three‐period, three‐treatment (drug A, drug B, and drugs A and B concomitantly) crossover design, pharmacokinetic parameters for either drug are only measured in two of the three periods. Similar missing data problems can arise for a four‐period, four‐treatment crossover pharmacokinetic comparability study. This paper investigates whether the usual ANOVA model for the crossover design can be applied under this pattern of missing data. It is shown that the model can still be used, contrary to a belief that a new one is needed. The effect of this type of missing data pattern on the statistical properties of treatment, period and carryover effect estimates was derived and illustrated by means of simulations and an example. Copyright © 2003 John Wiley & Sons, Ltd.
A scientist's viewpoint on promoting effective use of experimental design: Ten things a scientist wants to know about experimental design
Authors: Owen Martin R. , Armitage Mark , Chatfield Marion , Davies Bryan , Emiabata‐Smith David , Freeman Steve , Hayes Doug , Mann Inderjit , Ramsay Tom , Smith Linden , Squires Barney 
Published: March 2003

AbstractThis paper tackles the practical application of statistical tools. Chemical development is a rich area for collaboration between statisticians and chemists, but most statisticians encounter difficulties in promoting the tools to this client group. This paper, presented from a chemist's perspective, is intended to help bridge the gap between the two professions. The paper explores differences in uptake and attitudes towards adopting these techniques and suggests what has hindered or helped the process of effective application of experimental design. Copyright © 2003 John Wiley & Sons, Ltd.
Computational quantum chemistry in terms of multicenter Slater‐type orbitals: Entirely numerical procedure for the accurate evaluation of the basic integrals
Authors: Guidotti C. , Salvetti O. , Durante N. , Lamanna U. T. , Arrighini G. P. 
Published: March 2003

AbstractAb initio quantum mechanical calculations in terms of multicenter Slater‐type orbitals require accurate evaluation of basic one‐ and two‐electron integrals, a difficult mathematical task that becomes in particular challenging in the two‐electron case as four different expansion centers are involved. Here, we propose to illustrate the feasibility of attacking the problem of the multiple integrations needed entirely by numerical quadratures, in conjunction with a strategic program organization that allows evaluating simultaneously sets of thousands of integrals exploiting the mean characteristics of the integrands. This approach, envisaged and implemented many years ago by two of the present authors (C.G., O.S.), perhaps without adequate exposure, is endowed in our experience with good properties. The program package, which allows dealing on the same footing with linear and nonlinear molecular geometries, has been largely revised by introducing suitable adjustments and improvements (in particular extension to orbitals with azimuthal quantum number l = 3). © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003
Generation of systematic sequences of even‐tempered basis sets: Empirical generating formulae
Authors: Kryachko Eugene S. , Wilson Stephen 
Published: March 2003

AbstractSome empirical formulae for generating systematic sequences of even‐tempered basis sets are investigated and compared with Schmidt‐Ruedenberg ansatz. The new formulae ensure the asymptotic completeness of the sequence of even‐tempered basis sets but encompass greater flexibility than the Schmidt‐Ruedenberg scheme. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003
Ab initio model to predict NMR shielding tensors for solutes in liquid crystals
Authors: Mennucci Benedetta , Cammi Roberto 
Published: March 2003

AbstractWe present a model for the ab initio calculation of the nuclear magnetic shielding tensors for molecules in liquid crystalline solvents. The electrostatic interactions between the solute and the anisotropic solvent are described within the integral equation formalism (IEF) framework and the shielding tensors are calculated at the density functional theory linked to the gauge invariant atomic orbital (GIAO) approach. The IEF–GIAO approach is tested on the calculation of the shielding tensors for the different nuclei of CH3CN and C6H5NO2 in positive and negative anisotropic solvents. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003
Isotopic metrology of carbon dioxide. I. Interlaboratory comparison and empirical modeling of inlet equilibration time, inlet pressure, and ion source conductance
Authors: Verkouteren R. Michael , Allison Colin E. , Studley Steven A. , Leckrone Kristen J. 
Published: March 2003

AbstractWe report a pilot study of high‐precision differential isotope ratio measurements made on replicate samples of pure carbon dioxide using three instruments of identical manufacture. Measurement protocols were designed to explore the effects of sample size, ion source conductance, and inlet changeover equilibration time on the raw measurements. Our goal was better understanding of factors that influence these measurements in order to establish procedures for highly reproducible and accurate determinations of Reference Material (RM) isotopic compositions. Evaluation and modeling of reported data illuminated effects consistent with two instrumental memory sources—one short‐lived (t½ ∼ 10 s) and the other long‐lived (t½ ∼ 6–10 min), uncompensated by normal background measurements—that can significantly influence measurements made by the dual inlet method. These biases, proportional to the difference in isotopic compositions between the measured sample and reference gases, decrease in magnitude with increasing sample size, source conductance, and equilibration time. We observed biases as high as 0.1‰ per 10‰ difference between sample and reference gases. These memory sources may be responsible for measured δ13C values of RMs generally being highly reproducible within any single laboratory but less reproducible among independent laboratories. The magnitude of the bias is consistent with the ranges of δ13C values reported in prior laboratory intercomparisons. Uncertainties are most likely due to high and variable long‐lived memory among the instruments tested. Published in 2003 by John Wiley & Sons, Ltd.
Isotopic metrology of carbon dioxide. II. Effects of ion source materials, conductance, emission, and accelerating voltage on dual‐inlet cross contamination
Authors: Verkouteren R. Michael , Assonov Sergey , Klinedinst Donna B. , Brand Willi A. 
Published: March 2003

AbstractWe report high‐precision isotopic carbon dioxide measurements, made before and after ion source modification to gas isotope ratio mass spectrometry (IRMS) instruments. Measurement protocols were designed to explore the effects of ion source material substitution, source conductance, inlet pressure, electron emission, acceleration potential, and inlet changeover equilibration time. After modification of the IRMS instruments at the National Institute of Standards and Technology (NIST) and the Max‐Planck‐Institute for Chemistry (MPI‐Mainz), immediate changes were observed. At NIST, measurements were no longer sensitive to inlet equilibration times greater than 15 s, and different settings of ion source conductance resulted in δ13C shifts of about 0.04‰ per 10‰ measurement difference between sample and reference, a five‐fold improvement. No significant changes in machine performance were observed after a month of use. After a year, performance had degraded slightly, but was controlled by ion source cleaning and the use of low‐energy ion acceleration to minimize sputtering. At MPI‐Mainz, results were very similar. We report cross‐contamination coefficients measured since 1996, and discuss the role of adsorption, ion implantation, and sputtering on cross contamination in mass spectrometry systems. We recommend that users of high‐precision IRMS instruments test for and minimize the effects described. Published in 2003 by John Wiley & Sons, Ltd.
In vivo processing of LVV‐hemorphin‐7 in rat brain and blood utilizing microdialysis combined with electrospray mass spectrometry
Authors: Nydahl Katarina Sanderson , Pierson Johan , Nyberg Fred , Caprioli Richard M. , Andrén Per E. 
Published: March 2003

AbstractIn vivo microdialysis in combination with liquid chromatography/electrospray time‐of‐flight mass spectrometry was used to study the processing of LVV‐hemorphin‐7, an endogenous decapeptide with opioid activity, in rat brain and blood. A microdialysis probe (flow rate 0.4 μL/min) was used to both introduce LVV‐hemorphin‐7 into the striatum of the brain (1.0 pmol/μL) or the venous blood (10 pmol/μL) and to collect the metabolic products. LVV‐hemorphin‐7 was extracellularly metabolized in the striatum to form C‐terminal fragments 2–10, 3–10, 4–10, 5–10, 6–10, 7–10, and N‐terminal fragments 1–9, 1–8, 1–6. Infusion of the aminopeptidase inhibitor amastatin (1.0 pmol/μL) into the striatum, together with LVV‐hemorphin‐7, decreased the processing of LVV‐hemorphin‐7 to form C‐terminal fragments 2–10, 3–10, 4–10, but increased the relative levels of fragment 5–10 and N‐terminal fragments 1–9, 1–8 and 1–6. The major metabolic product from LVV‐hemorphin‐7 in the striatum was the C‐terminal fragment 5–10, which may be processed by an endopeptidase not sensitive to amastatin. The LVV‐hemorphin‐7 infusion to the venous blood produced the C‐terminal fragments 2–10, 3–10, 4–10, and 5–10, N‐terminal fragment 1–9, and internal fragments 4–7 and 4–9. It is concluded that the combination of microdialysis and electrospray mass spectrometry provides a powerful tool for the study of extracellular metabolism and kinetic processes of complex reaction systems in vivo. Copyright © 2003 John Wiley & Sons, Ltd.
Identification and fragmentation study of plasticizers with post‐source decay matrix‐assisted laser desorption/ionization mass spectrometry
Authors: Kéki Sándor , Szilágyi László Sz. , Deák György , Zsuga Miklós 
Published: March 2003

AbstractA detailed investigation of the most commonly used plasticizers, such as phthalate, adipate and trimellitate esters, using matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI‐TOFMS) and post‐source decay (PSD) MALDI‐TOFMS/MS is described. It is shown that PSD MALDI‐TOFMS/MS is capable of unambiguous determination of the different types of plasticizers. The determination of the types of plasticizers from different PVC samples by PSD MALDI‐TOFMS/MS, without the need for solvent extraction, is also demonstrated. The fragmentation mechanisms of these plasticizers cationized with protons and sodium ions are also reported. Copyright © 2003 John Wiley & Sons, Ltd.