bluuebunny/crossref_metadata_2025_split huggingface dataset:
The ADHD label, analogue methodology, and participants' geographic location on judgments of social and attentional skills
Authors: Koonce Danel A. , Cruce Michael K. , Aldridge Jennifer O. , Langford Courtney A. , Sporer Amy K. , Stinnett Terry A. 
Published: January 2004

AbstractTwo hundred fifty‐nine preservice teachers at a medium‐sized university in the Southwest participated in the current study. The participants were randomly assigned to a labeled condition, Attention Deficit Hyperactivity Disorder, or nonlabeled condition, and were presented a vignette in one of three forms: a written case study, a video clip, or a written case study with a video clip. The vignette described an elementary school aged child displaying disruptive behavior, while the video portrayed a similar aged child exhibiting disruptive behavior in the classroom. Following the presentation of the vignette, participants made judgments about the child's social skills and attentional skills by completing an examiner‐made rating scale. There was a significant main effect for the label condition on judgments of attention; participants in the labeled condition made significantly more negative judgment than did those in the nonlabeled condition. There were also significant main effects for the participants' high school location and vignette treatment. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 221–234, 2004.
A comparison of teacher checklists used over 15 days and a one‐day antecedent analysis to conduct a medication trial
Authors: Smith R. , Larsen D. , Derby K.M. , McLaughlin T.F. , Weber K.P. , Brown K. , Herring M. 
Published: January 2004

AbstractA one‐day antecedent analysis and an extended school‐based double‐blind medication trial were used to assess the effects of Ritalin on the disruptive behavior of a child diagnosed with ADHD. The evaluations took place in an outpatient clinic and in the child's general education classroom. The results of both evaluations indicated that the medication had a positive effect on reducing disruptive behaviors. The investigation suggests that the one‐day antecedent analysis procedure could be used as an initial evaluation of the use of Ritalin. More importantly, the one‐day trial provided results similar to the outcomes obtained during the school‐based evaluation. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 235–240, 2004.
Silent versus oral reading comprehension and efficiency
Authors: McCallum R. Steve , Sharp Shannon , Bell Sherry Mee , George Thomas 
Published: January 2004

AbstractSeventy‐four students read passages from an individually administered test of reading comprehension (a subtest from the Test of Dyslexia, a test of reading and related abilities currently in development; McCallum & Bell, 2001), and then answered literal and inferential questions. Students were randomly assigned to one of two conditions; 39 students read the passages silently and 35 read orally, with time recorded for each passage read. Comprehension and time were dependent measures for a Multivariate Analysis of Covariance (MANCOVA) and two follow‐up Analyses of Covariance (ANCOVA). After controlling for reading ability, results from the MANCOVA showed a significant combined effect ( p < .05); however, a comparison of mean reading comprehension scores showed no significant difference between silent readers and oral readers ( p > .05). On the other hand, with reading ability controlled, silent readers took significantly less time to complete passages compared to those who read orally ( p < .02). In fact, students took 30% longer to read orally than silently, on average. When test directions do not specify either oral or silent reading and error analysis is not a goal, testing will be more efficient via silent responding with no loss of comprehension. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 241–246, 2004.
Attachment theory: Implications for school psychology
Authors: Kennedy Janice H. , Kennedy Charles E. 
Published: January 2004

AbstractThe effective practice of school psychology requires a strong research and theoretical base, a framework that encompasses developmental processes and outcomes, both adaptive and maladaptive, which facilitates assessment and intervention and offers insight into classroom and family dynamics. Attachment theory provides the school psychologist with just such a framework. In the present article we provide a brief overview of attachment theory and describe risk factors for development of insecure attachment. Behavioral trajectories of children and adolescents according to attachment classification are discussed. Finally, student–teacher interactions within an attachment perspective and implications for interventions are presented. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 247–259, 2004.
Solvent‐ and interface‐induced surface segregation in blends of isotactic polypropylene with poly(ethylene‐co‐propylene) rubber
Authors: Opdahl Aric , Phillips Roger A. , Somorjai Gabor A. 
Published: January 2004

AbstractThe surface compositions and morphologies of melt‐quenched blends of isotactic polypropylene (iPP) with aspecific poly(ethylene‐co‐propylene) rubber (aEPR) were characterized by atomic force microscopy, optical microscopy, and X‐ray photoelectron spectroscopy. The surface morphologies and compositions formed in the melt are frozen‐in by crystallization of the iPP component and, depending on the processing conditions, are enriched in iPP or aEPR or contain a phase‐separated mix of iPP and aEPR. Enrichment of iPP is observed for blends melted in open air, in agreement with earlier work showing the high surface activity of atactic polypropylene at open interfaces. Surface segregation of iPP is suppressed at confined interfaces. Blends melt‐pressed between hydrophilic and hydrophobic substrates have phase‐separated iPP and aEPR domains present at the surface, which grow in size as the melt time increases. Surface enrichment of aEPR is observed after exposing melt‐pressed blends to n‐hexane vapor, which preferentially solvates aEPR and draws it to the surface. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 421–432, 2004
Structure and properties of regenerated cellulose/tourmaline nanocrystal composite films
Authors: Ruan Dong , Zhang Lina , Zhang Zhenjun , Xia Xinming 
Published: January 2004

AbstractNanocomposite films were successfully prepared from cellulose and tourmaline nanocrystals with mean diameters of 70 nm in a 1.5 M NaOH/0.65 M thiourea aqueous solution by coagulation with 5 wt % CaCl2 and then a 3 wt % HCl aqueous solution for 2 min. The structure and properties of the composite films were characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and tensile testing. The results indicated that the tourmaline nanocrystals were dispersed in a cellulose matrix, maintaining the original structure of the nanocrystals in the composite films. The loss peaks (tan δ) in the DMA spectra and the decomposition temperatures in the DSC curves of the composite films were significantly shifted toward low temperatures, suggesting that the nanocrystals broke the partial intermolecular hydrogen bonds of cellulose, and this led to a reduction in the thermal stability. However, the nanocomposite films exhibited a homogeneous structure and dispersion of the nanocrystals. When the tourmaline content was in the range of 4–8 wt %, the composite films possessed good tensile strength (92–107 MPa) and exhibited obvious antibacterial action against Staphylococcus aureus. This work provides a potential way of preparing functional composite films or fibers from cellulose and nanoinorganic particles with NaOH/thiourea aqueous solutions. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 367–373, 2004
Effects of crosslinking agent, cure temperature, and UV flux on the electro‐optical properties of polymer‐dispersed liquid crystal cells
Authors: Henry R. M. , Ramsey R. A. , Sharma S. C. 
Published: January 2004

AbstractWe present results for the effects of a crosslinking agent, cure temperature, and UV flux on the electro‐optical properties of polymer‐dispersed liquid crystal (PDLC) cells. These cells were fabricated using a mixture of a liquid crystal (E8) and an acrylic monomer (CN135). The maximum in the first derivative of the transmission vs. applied, sinusoidal voltage (inflection voltage, Vinf), varies systematically with PDLC formulation and cure‐process conditions. For PDLC cells fabricated with a crosslinking agent (SR295), Vinf increases with increasing the concentration of SR295. However, for cells fabricated without the use of a crosslinking agent, Vinf decreases with increasing the UV flux and decreasing temperature. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 404–410, 2004
Free volume and oxygen transport in cold‐drawn polyesters
Authors: Liu R. Y. F. , Hiltner A. , Baer E. 
Published: January 2004

AbstractPoly(ethylene terephthalate) (PET), poly(ethylene terephthalate‐co‐4,4′‐bibenzoate) (PETBB55), and poly(ethylene 2,6‐naphthalate) (PEN) were cold‐drawn to achieve uniform extension without crystallization or stress whitening, and oxygen transport properties were studied at temperatures from 10 to 40 °C. Correlation of oxygen solubility and polymer specific volume made it possible to consider the oriented polyester as a one‐phase densified glass. Orientation was viewed as decreasing the amount of excess‐hole free volume and bringing the nonequilibrium polymer glass closer to the equilibrium condition. Between 10 and 40 °C, the amount of excess‐hole free volume in PET decreased as the polymer approached the glass transition temperature. In contrast, temperature changes in this range had little effect on the excess‐hole free volume in PETBB55 and PEN, which were well below their glass transition temperature. Gas diffusion was viewed as discrete jumps of the oxygen molecule between holes of excess‐free volume. The jump length was extracted from the activation energy for diffusion according to a channel‐formation model. The result agreed well with the hole spacing estimated from a simple lattice model using the hole density reported in the literature. Extending the lattice model to estimate the mean excess‐free volume hole radius from the fractional free volume resulted in good correlation with the hole radius obtained from positron annihilation lifetime spectroscopy. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 493–504, 2004
Managing polymer surface structure using surface active block copolymers in block copolymer mixtures
Authors: Hexemer A. , Sivaniah E. , Kramer E. J. , Xiang M. , Li X. , Fischer Daniel A. , Ober C. K. 
Published: January 2004

AbstractSurface coatings were prepared from semifluorinated monodendron surface‐active block copolymers (SABC) and a thermoplastic elastomer (TPE) [poly(styrene‐b‐ethylene butylene‐b‐styrene)] by either spin‐casting a bilayer structure or by blending. The surface of these coatings was characterized by contact angle measurements, scanning force microscopy (SFM) and near‐edge X‐ray absorption fine structure (NEXAFS) methods. Both bilayers and blends resulted in very low energy surfaces under the right processing conditions and the liquid crystallinity of the semifluorinated monodendrons gave rise to temporally stable, non‐reconstructing surfaces in water. However for small thicknesses of the SABC top layer or for low SABC content blends, SFM shows islands of the fluorinated block of the SABC and incomplete surface coverage of the TPE, an observation confirmed by NEXAFS analysis. Very high water contact angles were produced by even modest amounts of SABC in either case but to achieve low contact angle hysteresis, it was necessary to produce uniform surface coverage by the SABC. Such uniform coverage can be accomplished by spin casting a top layer of SABC as thin as 60 nm in the bilayer case but at least 10 wt% SABC in TPE combined with drop casting of a hot solutions is needed for the blends to achieve equivalent surface structure and properties. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 411–420, 2004
Dynamic and equilibrium swelling of a sulfonic acid superabsorbent copolymer in salt solutions
Authors: Rosa Fátima , Bordado João , Casquilho Miguel 
Published: January 2004

AbstractSuperabsorbent copolymers were synthesized by free radical reverse emulsion from the monomers acrylamide and 2‐acrylamido‐2‐methyl‐propanosulfonic acid with a divinyl crosslinker (methylene‐bisacrylamide). The copolymer synthesized was then identified by Fourier transform infrared spectroscopy, its porosity was examined by electronic microscopy, and its specific gravity was determined by the conventional procedure. The dynamic and equilibrium swelling behavior of the copolymer was studied, in water and in salt solutions, at 25 °C (chlorides and sulfates of sodium and magnesium). As to the equilibrium swelling, the influence of the pH as well as of the salt type and its concentration was observed. As to the dynamic swelling, it was interpreted in terms of both a simple power of time equation, and a more detailed model based on a coupled diffusion‐relaxation mechanism. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 505–514, 2004
Water transport properties of thermoplastic polyurethane films
Authors: Dolmaire N. , Espuche E. , Méchin F. , Pascault J.‐P. 
Published: January 2004

AbstractTwo linear segmented polyurethanes, based on poly(oxyethylene) (POE) as a soft segment and 4,4′‐diphenylmethane diisocyanate and 1,4‐butanediol as hard segments and differing in their soft segment length, have been studied from a water vapor transport point of view. For both polyurethanes, the water sorption is governed by a Fickian process, and the thermoplastic polyurethane with the longer POE segments displays the higher water diffusion rate. The water sorption isotherms are Brunauer Emmet Teller (BET) type III for both thermoplastic polyurethanes, and the water uptakes are directly related to the polymer POE content. The Flory–Huggins theory cannot correctly describe the sorption isotherms. More sophisticated approaches (Koningsveld–Kleinjtens or Guggenheim‐Anderson‐de Boer (GAB) models) are needed to fit the experimental water uptakes. The positive deviation from Henry's law and the decrease in the apparent diffusion coefficient observed at a high activity have been particularly studied. In this activity range, an isotherm analysis based on the cluster integral of Zimm and Lundberg suggests some clustering phenomenon, which seems consistent with the diffusion coefficient variation. In agreement with the sorption results, the water permeability coefficients are small at low activities, and they increase greatly with the relative pressure of water. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 473–492, 2004
Poly(thiodiethylene adipate): Melting behavior, crystallization kinetics, morphology, and crystal structure
Authors: Finelli L. , Lotti N. , Munari A. , Gazzano M. , Malta V. 
Published: January 2004

AbstractThe melting behavior and crystallization kinetics of poly(thiodiethylene adipate) (PSDEA) were investigated with differential scanning calorimetry and hot‐stage optical microscopy. The observed multiple endotherms, commonly displayed by polyesters, were influenced by the crystallization temperature (Tc) and ascribed to melting and recrystallization processes. Linear and nonlinear treatments were applied to estimate the equilibrium melting temperature for PSDEA with the corrected values of the melting temperature. The nonlinear estimation yielded a higher value by about 9 °C. Isothermal crystallization kinetics were analyzed according to Avrami's treatment. Values of Avrami's exponent close to 3 were obtained, independently ofTc, in agreement with a crystallization process originating from predetermined nuclei and characterized by three‐dimensional spherulitic growth. As a matter of fact, space‐filling spherulites were observed by optical microscopy at allTc's. The rate of crystallization became lower asTcincreased, as usual at a low undercooling, the crystallization process being controlled by nucleation. Moreover, the crystal structure of PSDEA was determined from powder X‐ray diffraction data by full profile fitting. A triclinic unit cell containing two polymer chains arranged parallel to thecaxis was found. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 553–566, 2004
Surface modification of ultrahigh‐molecular‐weight polyethylene fibers
Authors: Zheng Zhen , Tang Xiaozhen , Shi Meiwu , Zhou Guotai 
Published: January 2004

AbstractTo prevent the loss of fiber strength, ultrahigh‐molecular‐weight polyethylene (UHMWPE) fibers were treated with an ultraviolet radiation technique combined with a corona‐discharge treatment. The physical and chemical changes in the fiber surface were examined with scanning electron microscopy and Fourier transform infrared/attenuated total reflectance. The gel contents of the fibers were measured by a standard device. The mechanical properties of the treated fibers and the interfacial adhesion properties of UHMWPE‐fiber‐reinforced vinyl ester resin composites were investigated with tensile testing. After 20 min or so of ultraviolet radiation based on 6‐kW corona treatment, the T‐peel strength of the treated UHMWPE‐fiber composite was one to two times greater than that of the as‐received UHMWPE‐fiber composite, whereas the tensile strength of the treated UHMWPE fibers was still up to 3.5 GPa. The integrated mechanical properties of the treated UHMWPE fibers were also optimum. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 463–472, 2004
Polypropylene/polystyrene blends: In situ compatibilization by Friedel‐Crafts alkylation reaction
Authors: Díaz Mónica F. , Barbosa Silvia E. , Capiati Numa J. 
Published: January 2004

AbstractThe application of Friedel‐Crafts alkylation reaction to the compatibilization of polypropylene (PP)/polystyrene (PS) blends was assessed. A PP macrocarbocation is chemically bonded to the PS benzene ring by aromatic electrophilic substitution. The graft copolymer formed at the interphase (PP‐g‐PS) showed relatively high emulsification strength, suggesting an effective behavior as in situ compatibilizer. The critical micelle concentration (CMC) was related to Friedel‐Crafts catalyst concentration. The amount of PS grafting and possible appearance of crosslinking and chain scission side reactions were also analyzed. The reaction products were characterized by a combination of size exclusion chromatography and Fourier transform infrared techniques applied after a careful solvent extraction separation. It was found, from the emulsification curve, that CMC was achieved when 0.7 wt % AlCl3 was added. This value was confirmed by scanning electron microscopy observation of phase adhesion on fractured sample surfaces. Mass balances of extracted PS showed that at least 15 wt % of the initial PS resulted grafted at the CMC condition. Chain scission reactions, in parallel with grafting, were verified to occur for PP as well as for PS. Instead, crosslinking reactions were not detected. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 452–462, 2004
Ultrasonic degradation of solutions of poly(vinyl acetate) in dioxan: The effects of the temperature and polymer concentration
Authors: Taghizadeh Mohammad Taghi , Mehrdad Abbas 
Published: January 2004

AbstractThe ultrasonic degradation of poly(vinyl acetate) (PVAc) solutions was carried out in dioxan at 25, 30, 35, 40, and 45 °C to investigate the effects of the temperature and solution concentration on the rate of degradation. The kinetics of degradation were studied by viscometry. The calculated rate constants indicated that the degradation rate of the PVAc solutions decreased as the temperature and solution concentration increased. The calculated rate constants were correlated in terms of the concentration, temperature, vapor pressure of dioxan, and relative viscosity of the PVAc solutions. This degradation behavior was interpreted in terms of the vapor pressure of dioxan, the viscosity, and the concentration of the polymer solutions. With increasing temperature, the vapor pressure of the solvent increased, and so the vapor entered the cavitation bubbles during their growth. This caused a reduction in collapsing shock because of a cushioning effect; therefore, the rate of degradation decreased. As the solution concentration increased, the viscosity increased and caused a reduction in the cavitation efficiency, and so the rate of degradation decreased. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 445–451, 2004
Radioimmunotherapy of prostate cancer in human xenografts using monoclonal antibodies specific to prostate specific membrane antigen (PSMA): Studies in nude mice
Authors: Vallabhajosula Shankar , Smith‐Jones Peter M. , Navarro Vincent , Goldsmith Stanley J. , Bander Neil H. 
Published: January 2004

AbstractBACKGROUNDProstate specific membrane antigen (PSMA), expressed by virtually all prostate cancers is an ideal target for targeted therapy of prostate cancer. Radiolabeled J591 monoclonal antibody (MAb) binds with high affinity to an extracellular epitope of PSMA and localizes specifically in PSMA positive LNCaP tumors in vivo.METHODSPre‐clinical radioimmunotherapy (RIT) studies using 131I‐huJ591 and 90Y‐1,4,7,10‐tetraazacyclododecane‐N,N′,N′′,N′′′‐tetraacetic acid (DOTA)‐huJ591 MAbs were studied in nude mice bearing LNCaP xenografts.RESULTSA 15–90% reduction in mean tumor volume was observed after a single dose of 131I‐huJ591 (3.7–11.1 MBq) or 90Y‐DOTA‐huJ591 (3.7–7.4 MBq). The median survival time increased 2–3 times relative to untreated controls. Multiple administrations of fractionated doses of 90Y‐DOTA‐huJ591 were even more effective with minimal toxicity. Radiation dose to blood and tumor was higher with 90Y than with 131I. The maximum tolerated dose (MTD) is 5.55 MBq for 90Y‐DOTA‐huJ591 and more than 11.1 MBq for 131I‐huJ591. For 90Y‐DOTA‐huJ591 at MTD, dose to the tumor was 2,753 cGy.CONCLUSIONSIn nude mice bearing PSMA positive tumors, radiation dose to the tumor with 90Y‐DOTA‐J591 is greater for large tumors than with 131I‐J591. The theoretical and practical considerations strongly suggest that 90Y‐DOTA‐huJ591 may be a suitable radiopharmaceutical for the treatment of prostate cancer. © 2003 Wiley‐Liss, Inc.