bluuebunny/crossref_metadata_2025_split huggingface dataset:
A supercloseness result for the discontinuous Galerkin stabilization of convection–diffusion problems on Shishkin meshes
Authors: Roos Hans‐Görg , Zarin Helena 
Published: May 2007

AbstractWe consider a convection–diffusion problem with Dirichlet boundary conditions posed on a unit square. The problem is discretized using a combination of the standard Galerkin FEM and an h–version of the nonsymmetric discontinuous Galerkin FEM with interior penalties on a layer–adapted mesh with linear/bilinear elements. With specially chosen penalty parameters for edges from the coarse part of the mesh, we prove uniform convergence (in the perturbation parameter) in an associated norm. In the same norm we also establish a supercloseness result. Numerical tests support our theoretical estimates.© 2007 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2007
Finite difference discretization of the Benjamin‐Bona‐Mahony‐Burgers equation
Authors: Omrani Khaled , Ayadi Mekki 
Published: May 2007

AbstractNumerical solutions of the Benjamin‐Bona‐Mahony‐Burgers equation in one space dimension are considered using Crank‐Nicolson‐type finite difference method. Existence of solutions is shown by using the Brower's fixed point theorem. The stability and uniqueness of the corresponding methods are proved by the means of the discrete energy method. The convergence in L∞‐norm of the difference solution is obtained. A conservative difference scheme is presented for the Benjamin‐Bona‐Mahony equation. Some numerical experiments have been conducted in order to validate the theoretical results.© 2007 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2007
Effects of preoperative therapeutic play on outcomes of school‐age children undergoing day surgery
Authors: William LI Ho Cheung , Lopez Violeta , Lee Tin Loi Isabel 
Published: May 2007

AbstractThe purpose of this study was to examine the effects of therapeutic play on outcomes of children undergoing day surgery. Two hundred and three children admitted for day surgery were invited to participate in a randomized controlled trial. The experimental group received therapeutic play; the control group received routine information preparation. Children in the experimental group reported significantly lower state anxiety scores in pre‐ and postoperative periods and exhibited fewer negative emotions at induction of anesthesia than children in the control group. No significant differences were found between the two groups in postoperative pain. The study provides some evidence that therapeutic play is effective in pre‐ as opposed to postsurgical management of children. © 2007 Wiley Periodicals, Inc. Res Nurs Health 30: 320–332, 2007
Uneventful administration of vincristine in Charcot–Marie–Tooth disease type 1X
Authors: Ajitsaria Richa , Reilly Mary , Anderson John 
Published: May 2007

AbstractCharcot–Marie–Tooth (CMT) disease is the most common inherited peripheral neuropathy. Administration of vinca alkaloids is considered contraindicated in CMT because of the risk of life threatening acute neuropathy. We describe a 5‐year‐old patient with a family history of X‐linked CMT1 who presented with Wilms tumour. Despite confirmation of a connexin 32 point mutation, the patient was treated with 40.5 mg/m2 of vincristine with no clinical evidence of drug‐related neuropathy. This case describes vincristine being safely administered to a patient with molecularly proven type CMT 1X, but in type 1A CMT vincristine is still contraindicated. An extensive literature review revealed no other series of cases in which vincristine administration in molecularly proven CMT 1X had been described. CMT should be excluded in any patient who develops a profound, acute neuropathy following vincristine, as many patients in the cases reviewed were asymptomatic prior to treatment. Pediatr Blood Cancer 2008;50:874–876. © 2007 Wiley‐Liss, Inc.
Proteome phenotyping of acid stress‐resistant mutants of Lactococcus lactis MG1363
Authors: Budin‐Verneuil Aurélie , Pichereau Vianney , Auffray Yanick , Ehrlich Dusko , Maguin Emmanuelle 
Published: May 2007

AbstractTo cope with medium acidity, Lactococcus lactis has evolved a number of inducible mechanisms commonly referred as acid stress response. To better understand the molecular basis of this response, several mutants constitutively tolerant to acidity were previously obtained by insertional random mutagenesis of L. lactis MG1363. Mutants in which the GMP synthase gene (i.e. guaA), the (p)ppGpp synthase gene (i.e. relA*) or the high affinity phosphate transport system (i.e. pstS) are inactivated are further characterized in this study. 2‐DE was performed and showed that 42, 26, and 35 protein spots are positively deregulated in the guaA, relA*, and pstS mutants, respectively, as compared to the wild‐type strain. Most of these proteins were identified by MS. Proteomes comparison of the mutants guaA, relA*, and pstS as well as the acid adaptation proteome of the wild‐type strain revealed (i) the presence of numerous overlaps and (ii) that only five proteins were overexpressed in the four conditions, suggesting that these proteins play a crucial role in the constitutive acid stress tolerance of the mutants and in the acid tolerance response of the wild‐type strain.
Proteomics of ionically bound and soluble extracellular proteins in Medicago truncatula leaves
Authors: Soares Nelson C. , Francisco Rita , Ricardo Cândido P. , Jackson Phil A. 
Published: May 2007

AbstractA large proportion of the apoplast proteome resides in the intercellular fluid (IF) or is ionically bound (IB) to the wall matrix. A combined analysis of IF and IB proteins of the Medicago truncatula leaf apoplast was performed. 2‐DE analyses demonstrated the reproducible presence of 220 IF and 84 IB proteins in the apoplast. These two protein populations were largely distinct; 22 proteins could be spatially matched, but MALDI‐TOF/TOF analyses suggested a considerably smaller number had common identities. MALDI‐TOF/TOF characterisation identified 81 distinct proteins. Analyses of selected IF proteins (45) indicated 17 distinct proteins with mainly defence‐related functions, whereas analyses of IB proteins (70) identified 63 distinct proteins of diverse natures, including proteins of non‐canonical natures. The presence of non‐canonical proteins in IB extracts is discussed in the light of evidence supporting a low level of contamination of purified walls from symplastic proteins. This work indicates that IB and IF proteins are functionally distinct fractions of the apoplast. The data obtained complements earlier studies of the Medicago proteome and therefore will be useful in future studies investigating the role of apoplastic proteins in plant processes.
Proteomic analysis of day–night variations in protein levels in the rat pineal gland
Authors: Møller Morten , Sparre Thomas , Bache Nicolai , Roepstorff Peter , Vorum Henrik 
Published: May 2007

AbstractThe pineal gland secretes the hormone melatonin. This secretion exhibits a circadian rhythm with a zenith during night and a nadir during day. We have performed proteome analysis of the superficial pineal gland in rats during daytime and nighttime. The proteins were extracted and subjected to 2‐DE. Of 1747 protein spots revealed by electrophoresis, densitometric analysis showed the up‐regulation of 25 proteins during nighttime and of 35 proteins during daytime. Thirty‐seven of the proteins were identified by MALDI‐TOF MS. The proteins up‐regulated during the night are involved in the Krebs cycle, energy transduction, calcium binding, and intracellular transport. During the daytime, enzymes involved in glycolysis, electron transport, and also the Krebs cycle were up‐regulated as well as proteins taking part in RNA binding and RNA processing. Our data show a prominent day–night variation of the protein levels in the rat pineal gland. Some proteins are up‐regulated during the night concomitant with the melatonin secretion of the gland. Other proteins are up‐regulated during the day indicating a pineal metabolism not related to the melatonin synthesis.
Synthesis and characterization of maleimide (Co)polymers with pendant benzoxazine groups by photoinduced radical polymerization and their thermal curing
Authors: Gacal Burcin , Cianga Luminita , Agag Tarek , Takeichi Tsutomu , Yagci Yusuf 
Published: May 2007

AbstractA maleimide monomer with benzoxazine and nitrile functionalities, 1‐[3‐(4‐cyano‐phenyl)‐3,4‐dihydro‐2H‐benzo[e] [1,3]oxazine‐6‐yl]‐maleimide (MI‐Bz‐4CN), was prepared using N‐(4‐hydroxyphenylmaleimide) (HPMI), formaldehyde, and 4‐aminobenzonitrile. Photoinduced radical polymerization was employed to prepare the alternating copolymers of MI‐Bz‐4CN with styrene (St) at room temperature using ω,ω‐dimethoxy‐ω‐phenylacetophenone (DMPA) as photoinitiator. These polymers were characterized by FT‐IR and 1H NMR. Monomer reactivity ratios for the studied monomer pair were calculated by using extended Kelen–Tüdos (Ex. K–T) method. Structural parameters of the copolymers were obtained calculating the diad monomer sequence fractions. Copolymers' compositions and the monomer reactivity ratios suggest the alternating nature of the copolymerization. Thermal behavior of the alternating copolymers P(MI‐Bz‐4CN‐alt‐St) was also investigated by thermogravimetrical analysis (TGA) and differential scanning calorimetry (DSC). The ring‐opening polymerization of the pendant benzoxazine groups of the copolymers was monitored by DSC and FT‐IR studies. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2774–2786, 2007
Thermoresponsive hydrogel of poly(glycidyl methacrylate‐co‐N‐isopropylacrylamide) as a nanoreactor of gold nanoparticles
Authors: Jiang Xiaowei , Xiong De'An , An Yingli , Zheng Peiwen , Zhang Wangqing , Shi Linqi 
Published: May 2007

AbstractThe synthesis of a thermoresponsive hydrogel of poly(glycidyl methacrylate‐co‐N‐isopropylacrylamide) (PGMA‐co‐PNIPAM) and its application as a nanoreactor of gold nanoparticles are studied. The thermoresponsive copolymer of PGMA‐co‐PNIPAM is first synthesized by the copolymerization of glycidyl methacrylate and N‐isopropylacrylamide using 2,2′‐azobis(isobutyronitrile) as an initiator in tetrahydrofuran at 70 °C and then crosslinked with diethylenetriamine to form a thermoresponsive hydrogel. The lower critical solution temperature (LCST) of the thermoresponsive hydrogel is about 50 °C. The hydrogel exists as 280‐nm spheres below the LCST. The diameter of the spherical hydrogel gradually decreases to a minimum constant of 113 nm when the temperature increases to 75 °C. The hydrogel can act as a nanoreactor of gold nanoparticles because of the coordination of nitrogen atoms of the crosslinker with gold ions, on which a hydrogel/gold nanocomposite is synthesized. The LCST of the resultant hydrogel/gold nanocomposite is similar to that of the hydrogel. The size of the resultant gold nanoparticles is about 15 nm. The hydrogel/gold nanocomposite can act as a smart and recyclable catalyst. At a temperature below the LCST, the thermoresponsive nanocomposite is a homogeneous and efficient catalyst, whereas at a temperature above the LCST, it becomes a heterogeneous one, and its catalytic activity greatly decreases. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2812–2819, 2007
Nanoelectromechanical systems based on multi‐walled nanotubes: nanothermometer, nanorelay, and nanoactuator
Authors: Popov Andrey M. , Bichoutskaia Elena , Lozovik Yurii E. , Kulish Anton S. 
Published: May 2007

AbstractWe report on three new types of nanoelectromechanical systems based on carbon nanotubes: an electromechanical nanothermometer, a nanorelay and a nanomotor. The nanothermometer can be used for accurate temperature measurements in spatially localized regions with dimensions of several hundred nanometers. The nanorelay is a prototype of a memory cell, and the nanoactuator can be used for transformation of the forward force into the relative rotation of the walls. Relative motion of the walls in these nanosystems is defined by the shape of the interwall interaction energy surface. Ab initio and semi‐empirical calculations have been used to estimate the operational characteristics and dimensions of these nanosystems. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Effect of water and hydrolysis catalyst on the crystal structure of nanocrystalline TiO2 powders prepared by sol–gel method
Authors: Juengsuwattananon K. , Jaroenworaluck A. , Panyathanmaporn T. , Jinawath S. , Supothina S. 
Published: May 2007

AbstractTiO2 powders were synthesized by a sol–gel method from tetrabutyl orthotitanate solution in the presence of water and hydrochloric acid. In order to study the effect of water content and hydrolysis catalyst (HCl) on crystal structure of the TiO2, a composition of H2O:EtOH:HCl was varied to 1:3:1, 1.5:1.5:2, 2:2:1 and 3:1:1. An increase of water and hydrochloric acid content in the precursor led to faster sol formation and greater yield of the TiO2 particle. Both water and hydrochloric acid were also found to promote the formation of rutile phase. Very fine spherical anatase and rutile crystals were obtained from the precursor containing small amount of water, while much larger needle‐shaped pure rutile was obtained when the precursor contained high amount of water. It was shown that phase composition can be monitored by easy manipulation of basic synthesis parameters such as the amount of water and acid catalyst. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Femtosecond electron‐ion dynamics in excited nano‐materials: Real‐time propagation based on the time‐dependent density functional theory
Authors: Miyamoto Yoshiyuki 
Published: May 2007

AbstractIn this article, I describe a method to perform molecular dynamics simulation under electronic excitation within a framework of the time‐dependent density functional theory and the Ehrenfest approximation. I present computational procedure and its application to carrier dynamics in carbon nanotubes. The difficulty in dealing with non‐adiabatic transition within a scheme of the density functional theory is also discussed. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Carbon nanotubes grown from individual gas phase prepared iron catalyst particles
Authors: Schäffel F. , Kramberger C. , Rümmeli M. H. , Kaltofen R. , Grimm D. , Grüneis A. , Mohn E. , Gemming T. , Pichler T. , Büchner B. , Rellinghaus B. , Schultz L. 
Published: May 2007

AbstractWe present a technique to grow carbon nanotubes by chemical vapour deposition of cyclohexane from separately generated catalytic iron nanoparticles. The catalyst particles are synthesized via inert‐gas condensation using DC‐sputtering at pressures in the mbar range. The preparation technique employed allows the production of individual and pure catalyst particles with a narrow particle size distribution. If deposited onto appropriate substrates these nanoparticles can act as individual nucleation sites for the growth of carbon nanotubes. Our findings show that the technique is highly viable for the precise engineering of nanoparticles in terms of material, size, purity, and density on substrates. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Growth of Rubrene thin film, spherulites and nanowires on SiO2
Authors: Luo Y. , Brun M. , Rannou P. , Grevin B. 
Published: May 2007

AbstractThe growth of rubrene thin films thermally evaporated under ultra‐high vacuum (UHV) on SiO2 has been investigated by combining atomic force microscopy (AFM), scanning electron microscopy (SEM), and polarized optical microscopy (POM) techniques. A mode of thin film growth in which an amorphous continuous holy film first covers the substrate, and acts afterwards as a template for the nucleation of polycrystalline rubrene spherulites, has been identified. Additionally, rubrene one‐dimensional structures have been observed with a catalyst‐free growth process. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Laser action in electrically driven quantum dot matrix
Authors: Krasnyj J. , Chuchmała A. , Jacak W. , Tytus M. , Donderowicz W. 
Published: May 2007

AbstractA lasing system based on electrically driven quantum dot matrix is proposed, where population inversion of the dot matrix is obtained by rapid (nonadiabatic) switching on of in‐plane electric field as a pumping force. Numerical analysis of electron–photon system kinetics is performed for various electric fields and temperatures. For parabolic type of confinement in QDs, a convenient amplification of contribution from several levels is indicated. The relevant analysis utilises an exact solution of Cauchy problem for an infinite chain of linear differential equations. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Taylor‐Entwicklungen und finite Ausdrücke für Δu und ΔΔu
Authors: Albrecht J. 
Published: May 2007

AbstractDie zur Herleitung finiter Ausdrücke für Δu und ΔΔ erforderliche Taylor ‐ Entwicklung eines allgemeinen Ansatzes wird durch geeignete Zusammenfassung partieller Ableitungen in eine übersichtliche Form gebracht, aus der leicht zu ersehen ist, welche Möglichkeiten hinsichtlich des Taylor ‐ Abgleiches bestehen. Es warden regelmäßige Gitter aus Quadraten, Dreiecken, Sechsecken und Würfeln zugrunde gelegt.
Über die Verteilungsfunktionen von Vektorsummen
Authors: Deuker E. A. 
Published: May 2007

AbstractIn einem p‐dimensionalen, euklidischen Raum seien n Vektoren von beliebiger zunächst fester Länge gegeben, deren Orientierungen statistisch mit gleicher Wahrscheinlichkeit verteilt sind. Der Betrag des Summenvektors ist eine statistische Gröβe, für deren Verteilung eine allgemeine, für alle positiven, ganzzahligen p und n gültige Formel in Gestalt eines uneigentlichen Integrals über Besselsche Funktionen hergeleitet wird. Diese Verteilungen gehen, unter bestimmten Bedingungen, für große Werte von n asymptotisch in bekannte Verteilungen der mathematischen Statistik über.
Über die Fortpflanzung kleiner Störungen in flüssigen Medien, betrachtet als Ausbreitungsvorgang von Unstetigkeiten in den Lösungen der Bewegungsdifferentialgleichung
Authors: Nitsche Johannes 
Published: May 2007

AbstractDie Fortpflanzung einer kleinen punkthaften Störung in zwei längs ebener Trennfläche aneinandergrenzenden Flüssigkeiten wird nach der Methode der Unstetigkeiten als Ausbreitungsvorgang kleiner Druck‐ und Geschwindigkeitssprünge behandelt. Die Verteilung des Drucksprunges auf der Stoßfront wird angegeben und genauer diskutiert für den Fall, daß die Störung von einem Punkt der Trennfläche ausgeht. Die Verhältnisse bei auftretender Totalreflexion werden an einem Beispiel betrachtet.
Über Gleichungssysteme der Tschebyscheffschen Approximation
Authors: Wenzl F. 
Published: May 2007

AbstractAufgaben der Tschebyscheffschen Approximation mit reellem Approximationsintervall lassen sich häufig auf Gleichungssysteme zurückführen, in denen auch die Stellen maximaler Abweichung innerhalb des Approximationsintervalls als Unbekannte auftreten. Die rechnerische Behandlung solcher Gleichungssysteme kann sich beträchtlich vereinfachen, wenn man diese Stellen nach dem Vorzeichen der zugehörigen Differenz zwischen Näherungsfunktion und angenäherter Funktion in 2 Klassen einteilt und von jeder dieser Klassen die symmetrischen Grundfunktionen aufsucht.
Die Ausbildung eines Elastizitäts‐Störmoments beim schwingenden Pendel mit elastischer Schneide bzw. elastischer Unterlage
Authors: Tesch H. 
Published: May 2007

AbstractVerformte Oberflächenteile der elastischen Schneide oder Unterlage eines Pendels in der Nähe der Druckflächenbegrenzung werden beim Schwingungsvorgang periodisch belastet und entlastet. Wegen der Trägheit des elastischen Mittels gegenüber Formänderungen entsteht durch Aufwalzung ein Elastizitäts‐Störmoment, das die Schwingungszeit des Pendels verkürzt.
Konforme Abbildungen durch elliptische Funktionen
Authors: Fick E. 
Published: May 2007

AbstractEs werden in der folgenden Arbeit die konformen Abbildungen dargestellt, die die Funktionen φ, ζ, σ, σ3, sn, cn, dn, am, E, zn, ν1, und ν4 bei rechteckigem Gitter liefern. Die Kurven wurden numerisch berechnet.
Zur Tschaplyginschen Hodographenmethode bei Unterschallströmungen mit Zirkulation
Authors: Richter H. , Müller W. 
Published: May 2007

AbstractSeit der zusammenfassenden Darstellung von A. Busemann [3]1) in dieser Zeitschrift sind über die Tschaplyginsche Methode weitere grundlegende Arbeiten [4–7] erschienen, die Zirkulation zulassen. In mancher Hinsicht ermangelt dabei die Behandlung völliger Strenge. Die vorliegende Arbeit will in einer Gesamtdarstellung diese Lücken durch Diskussion der verwendeten Abbildungen schließen. Insbesondere wird die Möglichkeit der eindeutigen Zuordnung von kompressibler zu inkompressibler Strömung untersucht. Durch funktionentheoretische Betrachtungen wird ein einfacher Weg zur Berechnung der Luftkräfte gewonnen. Die entstehenden Formeln sind denen bei inkompressibler Strömung analog.
Zur Behandlung der kompressiblen Unterschallströmung durch axiale und radiale Schaufelgitter
Authors: Isay Wolfgang‐Hermann 
Published: May 2007

AbstractEs wird eine Methode zur näherungsweisen Berechnung der kompressiblen Unterschallströmung durch axiale und radiale Schaufelgitter mit beliebig stark gekrümmten Schaufelprofilen angegeben. Dabei werden wesentlich die Ergebnisse benutzt, die der Verfasser in zwei vorangehenden Arbeiten für die in kompressible Strömung durch solche Schaufelgitter abgeleitet hat.
Zur Problematik des Entlastungsvorganges nach plastischer Verformung
Authors: Schlechtweg H. 
Published: May 2007

AbstractWird eine Hohlkugel durch Innendruck in einer Innenzone a < r < c plastisch ohne Eintreten von Verfestigung beansprucht, so tritt bei sphärischer Symmetrie während der Entlastung keine allmähliche Verschiebung der Grenze c der plastisch beanspruchten Innenzone zum Innenrand hin auf. Dabei wurde das elastische Verhalten als inkompressibel vorausgesetzt; für die Entlastung im plastizierten Gebiet c < r < c wurden die gleichen Elastizitätskonstanten angenommen wie in der elastisch gebliebenen Außenzone c < r < b0.
Eine indirekte Bestimmung der Airyschen Fläche bei unstetigen Wärmespannungen
Authors: Hieke Max 
Published: May 2007

AbstractIn der nachstehenden Arbeit wird eine Methode zur indirekten Bestimmung der Airyschen Fläche bei unstetigen Wärmespannungen in radial‐ und achsensymmetrischen Körpern angegeben, die sich auf den Gaußschen Satz und auf die Definition eines stetigen Verschiebungsvektors stützt.
Zur Berechnung der Beulwerte von längs oder querversteiften rechteckigen Platten unter Drucklast
Authors: Schnell W. 
Published: May 2007

AbstractFür längs‐ oder querversteifte Platten werden Matrizen aufgestellt, die es erlauben, die exakte Berechnung der kritischen Druckspannungen weitgehend zu schematisieren. Die Ränder senkrecht zu den Versteifungen müssen gelenkig gelagert sein; auf den beiden anderen Rändern können beliebige Randbedingungen vorgeschrieben sein.
Effect ofPrandtlnumber on the heat transfer properties of a turbulent boundary layer when the temperature distribution along the wall is arbitrarily assigned
Authors: Ferrari C. 
Published: May 2007

AbstractVerf. untersucht das Problem des Einflusses derPrandtlschen Zahl auf die turbulenten Wärmeübergänge in Strömungen mit hoher Geschwindigkeit für eine beliebige Wandtemperatur. Es wird der Einfluß derPrandtlschen Zahl auf den Rückgewinnfaktor bestimmt; dann erhält man, unter Berücksichtigung einer laminarturbulenten Übergangsschicht, die Formeln, die dieNusseltsche Zahl ergeben und die als eine Erweiterung der Formeln vonPrandtl‐Taylorund von vonKàrmànbetrachtet werden können.Die experimentellen Ergebnisse stehen in gutem Einklang zu den rechnerischen Ergebnissen.