bluuebunny/crossref_metadata_2025_split huggingface dataset:
A three tier evaluation of PTSD among Vietnam combat veterans
Authors: Hyer Lee , Boudewyns Patrick A. , Woods Marilyn G. 
Published: May 2007

AbstractA three tier evaluation procedure for chronic Post‐traumatic Stress Disorder victims from Vietnam was presented. This evaluation attempts to disaggregate clinical data on a chronic population for purposes of treatment. One hundred veterans with PTSD took personality inventories (MCMI and MMPI), were included in a life style analysis procedure (including early recollections and irrational beliefs), and were evaluated on symptoms. Tier 1 consisted of a life style analysis. This procedure was described and selected data on early recollections and irrational beliefs were presented. Results reflected negative or trauma themes and an excessive amount of irrational beliefs. Tier 2 involved the use of the MCMI. A typology was developed based on a traumatic personality (Passive Aggressive and Avoidant) and three variants. Tier 3 involved symptoms, psychosocial and trauma. Results showed multiple psychosocial symptoms and emphasized the need to contextualize these within the personality (and life style). Also, traumatic memories were collected and four questions were developed to “address” these in therapy. A case history was presented on the use of this evaluation method.
Integrated qualitative assessment of wetland hydrological and land cover changes in a data scarce dry Ethiopian highland watershed
Authors: McHugh O. V. , McHugh A. N. , Eloundou‐Enyegue P. M. , Steenhuis T. S. 
Published: May 2007

AbstractWetlands are important sources of water for humans and livestock in the dry drought‐prone northern Ethiopian highlands. Hydrological changes in these wetlands affect local populations and are indicators of change in the upstream catchments. In this paper, we present a case study of hydrological and land cover changes in Hara Swamp located southeast of Kobo in Amhara State, Ethiopia. An integrated approach used remote sensing images, limited hydrological measurements, climatic data, and a survey of residents to gain complementary insights into what changes have occurred, when and why they occurred, and the local perceptions of these changes. Aerial photos and satellite images from 1964, 1973, 1986, 2000, and 2001 indicated limited flooding and dense woody vegetation cover in the wetland 40 years ago and a trend towards the current condition of no living trees/bushes, extensive flooding, and heavy sedimentation. Rainfall records revealed no significant trends which could sufficiently explain the observed changes in the wetland. A simple water budget analysis based on hydrological measurements indicated higher wetland flood levels were a result of increasing runoff and sediment inflow from the surrounding watershed over time. Reasons for increasing amounts of runoff were higher population pressure on the land and creation of more impermeable surfaces including houses and road construction in the watershed. Local residents' perceptions of the wetland changes, which were collected first, validated the sparse biophysical data and provided supplementary details. An integrated watershed management strategy is required to reverse the recent trends and protect the wetland resources. Copyright © 2007 John Wiley & Sons, Ltd.
Contrasting “complainers” with “non‐complainers” on attitude toward complaining, propensity to complain, and key personality characteristics: A nomological look
Authors: Bodey Kelli , Grace Debra 
Published: May 2007

AbstractThis study examines the influence of four personality characteristics (self‐efficacy, Machiavellianism, perceived control, and risk‐taking) on consumer attitude toward complaining and propensity to complain. The proposed model is tested on two groups of consumers classified as “complainers” and “non‐complainers.” The findings reveal that the two groups differ distinctly on the pattern of relationships among the variables. The implications of these differences are discussed. © 2007 Wiley Periodicals, Inc.
Analysis of a FitzHugh–Nagumo–Rall model of a neuronal network
Authors: Cardanobile Stefano , Mugnolo Delio 
Published: May 2007

AbstractPursuing an investigation started in (Math. Meth. Appl. Sci. 2007; 30:681–706), we consider a generalization of the FitzHugh–Nagumo model for the propagation of impulses in a network of nerve fibres. To this aim, we consider a whole neuronal network that includes models for axons, somata, dendrites, and synapses (of both inhibitory and excitatory type). We investigate separately the linear part by means of sesquilinear forms, in order to obtain well posedness and some qualitative properties. Once they are obtained, we perturb the linear problem by a nonlinear term and we prove existence of local solutions. Qualitative properties with biological meaning are also investigated. Copyright © 2007 John Wiley & Sons, Ltd.
Modeling hyperelastic behavior of rubber: A novel invariant‐based and a review of constitutive models
Authors: Beda T. 
Published: May 2007

AbstractA constitutive phenomenological model completing the Gent‐Thomas concept is carried out to formulate laws governing the hyperelastic behavior of incompressible rubber materials. It is shown that the phenomenological Gent‐Thomas model (1958) and the constrained chain model (1992) give similar precise results at small to moderate deformation. On the other hand, comparisons of the outcome of the proposed model with that of the molecular model from the combined concepts of Flory‐Erman and Boyce‐Arruda (2000), and with those of the phenomenological models of Ogden (1982), Yeoh‐Fleming (1997), Pucci‐Saccomandi (2002) and Beda (2005) are made. Residual inconveniences raised by attractive continuum models in rubber elasticity literature have been successfully overcome. Results from both the statistical and phenomenological mechanics concepts are compared with the data of some useful classical materials (rubbers of Treloar, Rivlin‐Saunders, Pak‐Flory and Yeoh‐Fleming). The results permit one to see salient equivalence of the two theories for a more reliable prediction of stress‐stretch response for all states of any mode of deformation. A complete and exhaustive analysis of the Mooney plot that combines small and very large extension‐compression has been quite essential in assessing the validity of models. A method of identification of material parameters is presented and data of the simple tension suffice for the determination of the parameter values. It is shown that the ordinary identification procedures, such as the usual least squares, a very much used numerical method in materials investigation, can be unsuitable in some cases of hyperelastic modeling. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1713–1732, 2007
A molecular dynamics simulation and quantum chemistry study of poly(dimethylsiloxane)–silica nanoparticle interactions
Authors: Smith James S. , Borodin Oleg , Smith Grant D. , Kober Edward M. 
Published: May 2007

AbstractWe have conducted atomistic molecular dynamics (MD) simulations of poly(dimethylsiloxane) (PDMS) melts in contact with bare silica and modified (with hydroxyl and trimethylsiloxy groups) silica surfaces using a quantum chemistry‐based force field. MD simulations accurately predicted changes in PDMS dynamics with addition of SiO2 observed in quasielastic neutron scattering experiments. In MD simulations, the density of PDMS near the bare silica surface was found to be much greater and the dynamics of interfacial PDMS much slower than that observed for unperturbed PDMS melts due to strong Van der Waals dispersion forces between PDMS and the silica surface. The presence of hydroxyl and trimethylsiloxy groups on the silica surface resulted in a decrease in the density of interfacial PDMS and a speedup in polymer dynamics relative to those observed for PDMS near the bare silica surface due to increased separation between PDMS and the silica surface and a corresponding decrease in the strength of the dispersion attraction between the polymer and the surface. Despite the presence of strong hydrogen bonding interactions between small molecule models for hydroxylated silica and PDMS observed in our quantum chemistry studies, no significant hydrogen bonding was observed in the MD simulations of PDMS in contact with hydroxylated silica surfaces. Nevertheless, interactions between hydroxyl groups and PDMS oxygen atoms were found to play a role in determining structure and dynamics of interfacial PDMS for surfaces with low to moderate degrees of hydroxylation. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1599–1615, 2007
Characterization of a self‐oscillating polymer with periodic soluble‐insoluble changes
Authors: Ueda Masanori , Hara Yusuke , Sakai Takamasa , Yoshida Ryo , Takai Madoka , Ito Yoshihiro 
Published: May 2007

AbstractA copolymer of N‐isopropylacrylamide (NIPAAm), ruthenium‐complex (Ru(bpy)3), and N‐succinimidyl acrylic acid (NAS) was synthesized to investigate its selfoscillating properties in a solution. This polymer exhibits selfoscillation in turbidity and viscosity synchronized via a Belousov–Zhabotinsky (BZ) reaction. The molecular size of the polymer during oscillation was investigated by dynamic light scattering and electrochemical measurements. Both molecular size and viscosity exhibited periodic changes during the BZ reaction. A simple mechanism accounting for such periodic changes was investigated by numerical calculations. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1578–1588, 2007
Miscibility and surface segregation in PVC/polyester blends—The influence of chain architecture and composition
Authors: Lindström Annika , Hakkarainen Minna 
Published: May 2007

AbstractFour poly(butylene adipate) (PBA) polyesters, the structure ranging from linear to highly branched, were synthesized and solution casted with poly(vinyl chloride) (PVC) in 20 or 40 wt % concentrations to evaluate the influence of polyester chain architecture on miscibility, surface segregation, and mechanical properties. The miscibility of PVC and polyesters is based on specific interactions between the carbonyl group in the polyester and PVC. These interactions cause a shift in the carbonyl absorption band in the FTIR spectra. The shifting of the carbonyl absorption band was more significant for all the 40 wt % blends compared with the blends containing 20 wt % of the same polyester. In the 20 wt % blends surface segregation and enrichment of polyester at the blend surface increased as a function of branching. However, all the films containing 40 wt % of polyester had similar surface composition. This is explained by better miscibility and stronger intermolecular interactions in the 40 wt % blends, which counteract the effect of branching on the surface segregation. High degree of branching resulted in poor miscibility with PVC and poor mechanical properties. A linear or slightly branched polyester structure, however, resulted in good miscibility and desirable blend properties. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1552–1563, 2007
Effect of AlN content on the performance of brominated epoxy resin for printed circuit board substrate
Authors: Yung K. C. , Zhu B. L. , Wu J. , Yue T. M. , Xie C. S. 
Published: May 2007

AbstractPolymer matrix composites, based on brominated epoxy, a type of material widely used in printed circuit boards (PCBs), as matrix and AlN particle as filler were prepared. The influences of AlN content on the mechanical, thermal, and electrical properties of the composites were investigated by uniaxial tensile test, TMA, thermal conductivity measurement, DMA, and dielectric properties measurement. It was found that the properties of composites monotonically varied with AlN content except that maximum tensile strength and strain of composites corresponded to a filler content of 10 wt %. The results of DMA also showed the AlN reinforcement was more pronounced above Tg, and the peak area of tan δ versus T curves decreased with AlN content, which implied the damping capacity of the composite gradually decreased. The increase in Tg and decrease in damping were probably due to strong interaction between the AlN and epoxy matrix inhibiting the mobility of the epoxy chain. In addition, different theoretical models reported in the literature were used to predict the E, CTE, k, and Dk, and compared with the experimental data. Finally, suitable models were recommended in the present materials system. For the significant improvement of performance of epoxy, we can conclude that these composite materials may be promising for PCB substrate. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1662–1674, 2007
Micro‐Raman study of strain fields around dislocations in GaAs
Authors: Irmer G. , Jurisch M. 
Published: May 2007

AbstractThe reliability of microelectronics devices strongly depends on defects like dislocations in the semiconductor wafers. Whereas several methods are routinely used to measure the dislocation density and residual stress in wafers, there is a need of methods to characterize the strain and stress fields around single dislocations with high lateral resolution. The strain and stress fields around single edge and screw dislocations in GaAs are considered, and the corresponding Raman shifts of the phonons are calculated. Due to the finite local resolution, mappings show averaged strain values. Requirements for lateral resolution and signal/noise ratios of the Raman measurements to characterize dislocations are discussed. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Quantitative determination of the cytidine deaminase inhibitor tetrahydrouridine (THU) in mouse plasma by liquid chromatography/electrospray ionization tandem mass spectrometry
Authors: Parise Robert A. , Egorin Merrill J. , Eiseman Julie L. , Joseph Erin , Covey Joseph M. , Beumer Jan H. 
Published: May 2007

AbstractA number of anticancer drugs are cytidine analogues that undergo metabolic deactivation catalyzed by cytidine deaminase (CD). 3,4,5,6‐Tetrahydrouridine (THU) is a potent inhibitor of CD, by acting as a transition‐state analogue of its natural substrate cytidine. However, to date its pharmacokinetic properties have not been fully characterized, which has impaired its optimal preclinical evaluation and clinical use. We report a liquid chromatography/tandem mass spectrometry (LC/MS/MS) assay for the sensitive, accurate and precise quantitation of THU in mouse plasma. Validation was performed according to FDA guidelines. The assay employed deuterated THU as the internal standard and an acetonitrile protein precipitation step. Separation, based on hydrophilic interaction chromatography, was achieved with an amino column and an isocratic mobile phase of 0.1% formic acid in acetonitrile and water followed by a wash. Chromatographic separation was followed by positive‐mode electrospray ionization MS/MS detection in the multiple reaction monitoring (MRM) mode. The assay was accurate (92.5–109.9%) and precise (2.1–9.0%) in the concentration range of 0.2–50 µg/mL. Recovery from plasma was near‐complete (92.9–119.3%) and ion suppression was negligible (−17.5 to −0.2%). Plasma freeze/thaw stability (93.1–102.1%), stability for 3 months at −80°C (99.5–110.9%), and stability for 4 h at room temperature (92.1–102.4%) were all in order. This assay is currently being used to quantitate THU in ongoing pharmacokinetic studies. In addition, the assay is expected to be a useful tool in any future studies involving co‐administration of THU with cytidine analogues. Copyright © 2007 John Wiley & Sons, Ltd.
Exact Solutions of the Unsteady Hydrodynamic and Hydromagnetic Boundary Layer Equations in a Rotating Fluid System
Authors: Debnath L. 
Published: May 2007

AbstractThis paper provides a general study of the unsteady hydrodynamic and hydromagnetic boundary layer flows including the effects of the pressure gradient and uniform suction or blowing. Exact solutions of the boundary layer equations are obtained by using the Laplace transform treatment. Asymptotic analysis is carried out to determine the unsteady flow field for small and large times. The structure of the velocity distribution and the associated boundary layers is investigated for resonant and, non‐resonant cases with physical significance. The ultimate steady‐state hydrodynamic and hydromagnetic boundary layer flows are examined for various cases related to uniform suction or blowing, resonant and non‐resonant frequencies. It is shown that the ultimate steady‐state flows are eventually established through inertial oscillations and the propagation of diffused waves. The non‐existence of the ultimate steady‐state hydrodynamic solution for the case of resonance and blowing is investigated with physical significance. In the hydromagnetic situation, the ultimate boundary layer flow is found to exist for all cases involved in the problem including the case of blowing and resonance. Several special results of interest are discussed.
Local Similarity Co‐ordinates for Parallel and Almost Parallel Turbulent Shear Flows
Authors: Hoffmeister M. 
Published: May 2007

AbstractTaking into account dynamical effects local similarity numbers are developed. These involve both momentum and vorticity transfer transversal to the mean flow direction and can be regarded as a generalization of proposals made by L. Prandtl, G. I. Taylor, and Th. v. Kármán. The application to eight typical shear flows reveals common local properties and allows us to establish a common approximation for the eddy viscosity.
Zur elastisch‐plastischen Deformation der zentrisch erhitzten Scheibe
Authors: Gamer U. 
Published: May 2007

AbstractUntersucht werden Spannungen, Verschiebung und plastische Dehnungen in einer zentrisch erhitzten idealplastischen Kreisscheibe unter Zugrundelegung der Fließbedingungen von Tresca und von v. Mises sowie der zugehörigen Fließregeln.
Application of the Method of One‐Dimensional Functionals to the Solution of Elasto‐Plastic Problems
Authors: Yanenko N. N. , Vasilkovsky S. N. 
Published: May 2007

AbstractIn the present paper a variational formulation of the method of the approximated factorization of multi‐dimensional differential operators is given. The method of one‐dimensional functionals being developed on the above mentioned basis allows to reduce the solution of multi‐dimensional problems in mathematical physics to the successive minimization of certain one‐dimensional functionals. The efficiency of the presented method of one‐dimensional functionals relative to well‐known variational methods is shown by solving two‐dimensional quasistatic boundary value problems with active loads when the plastic state is described by relations from the theory of Prandtl‐Reuß flows.
Influence of Noise on Duffing‐Van der Pol Oscillators
Authors: Ebeling W. , Herzel H. , Richert W. , Schimansky‐Geier L. 
Published: May 2007

AbstractThe stochastic motions of Duffing‐Van der Pol oscillators driven by white noise are investigated by using several theoretical methods: analytical and numerical calculations of the stationary probability distribution, analysis of the Hopf bifurcation, computer simulations and study of Lyapunov exponents. One observes a break of the radial symmetry and noise induced oscillations.
Non‐Linear Vibration of a Cantilever Beam of Variable Cross‐Section
Authors: Pielorz A. , Nadolski W. 
Published: May 2007

AbstractLarge amplitude free vibration of an inextensible thin elastic beam of a variable cross‐section is analysed. Although large deflections and rotations are considered the strains are small. It is shown how approximate solutions can be obtained by using Galerkin's method, and the effect of the variation of cross‐section is investigated. For the beam of constant cross‐section the results are compared with those of paper [3] and the exact solution of the special case of an ordinary differential equation obtained in the paper is considered. Additionally, a simple method for static deflections of the beam is proposed.
On the Convergence of the Fuzzy Clustering Algorithm “Fuzzy ISODATA”
Authors: Trzebiatowski G. , Bank B. 
Published: May 2007

AbstractIn der vorliegenden Arbeit wird für den unscharfen Partitionierungsalgorithmus “Fuzzy ISODATA” gezeigt, daß ausgehend von beliebigem Startpunkt jeder Häufungspunkt der generierten Folge ein stationärer Punkt des erweiterten, Quadratischen‐Fehlersummen‐Funktionals ist, welches als Partitionierungskriterium dient. Weiterhin liefert jeder dieser Häufungspunkte den gleichen Zielfunktionswert. Der Algorithmus “Fuzzy ISODATA” produziert keine Zyklen.
Ein superkonvergentes Zeitintegrationsverfahren für dynamische Systeme und andere Problemem‐ter Ordnung
Authors: Gärtner S. 
Published: May 2007

AbstractEs wird eine allgemeine Methode zur direkten Integration von Anfangswertaufgaben m‐ter Ordnung erörtert. Die Approximation kann mit beliebigen Interpolationspolynomen (Lagrange, Hermite, Birkhoff usw.) erfolgen. Der Defektabgleich wird derart bestimmt, daß der Abbruchfehler eine höhere Ordnung erhält. Dieses Approximationsziel führt auf Bezichungen, mit denen sich die wichtigsten Verfahren zur direkten Zeitintegration dynamischer Systeme (Newmark, Wilson, Argyris, Malsch, Gellert usw.) herleiten und auf eine einheitliche Struktur zurückführen lassen. Außerdem wird gezeigt, daß Hermitesche Interpolationen mit einer korrespondierenden Kollokationsmethode auf diskrete Superkonvergenz höchster Ordnung führen.
Symmetrical Tensor Fields of Constant Eigenvalue Ratio and Solutions of the Stress Equations for Creeping Motion
Authors: Langbein W. 
Published: May 2007

AbstractMethods of solution for the nonlinear stress tensor field equations of matter in the creeping motion state are analysed. For homogeneous matter in two space dimensions the problem proves to be equivalent to the construction of symmetrical tensor fields of constant eigenvalue ratio (1 − β)/(1 + β) and constant divergence g, where β and g are the internal friction parameter and the specific weight. A nonlinear second order differential equation remains if a modified Airy stress potential is introduced. This equation is solved generally for β2 1, g ≠ 0 and also for β2 = 1, g arbitrary. Physically, the corresponding stress fields describe weightless plastic matter and slowly moving anisotropic fluids respectively. For g ≠ 0 classes of new solutions are derived in the β2 = 1 case.
Further Results Concerning the Dynamic Response of Shear Deformable Elastic Orthotropic Plates
Authors: Librescu L. , Khdeir A. A. , Reddy J. N. 
Published: May 2007

AbstractThe dynamic response of orthotropic and transversely‐isotropic flat plates to dynamic transverse loading and in‐plane tensile loads constitutes the main topic of this paper. The dynamic loading conditions considered herein include sine, rectangular and triangular pulses while spatially, they are considered as sinusoidally distributed. The results obtained as per a higher‐order plate theory are compared with their first order transverse shear deformation and classical counterparts. In addition, some results concerning the associated free‐vibration and bi‐axial buckling of such plates are presented and comparisons with some of the available results are undertaken.
Darstellungen höherstufig‐tensorwertiger isotroper Funktionen
Authors: Silber G. 
Published: May 2007

AbstractEs wird eine isotrope Potenzreihendarstellung für einen Tensor beliebiger (p‐ter) Stufe als Funktion einer Argumentenliste von Tensoren bis zur n‐ten Stufe entwickelt. Diese Darstellung läßt sich für den einfachsten Fall eines Tensors p‐ter Stufe als Funktion eines Vektors in einen geschlossenen Ausdruck kondensieren. Beide Entwicklungen ermöglichen einen Darstellungssatz transversal‐isotroper Stoffe, einschließlich aller Invarianten höherstufiger Tensorargumente. Wie zu erwarten, enthält diese Systematik beispielsweise auch die Materialgleichungen piezo‐elastischer Stoffe.