bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simultaneous gravimetric and calorimetric analysis of chloroform sorption in nanoporous semicrystalline sPS
Authors: Sannino A. , Larobina D. , Mensitieri G. , Aldi A. , Maffezzoli A. 
Published: March 2005

AbstractChloroform vapor sorption in semicrystalline syndiotactic polystyrene with a nanoporous crystalline form has been investigated by simultaneous gravimetric and calorimetric analysis to gather information on the sorption process and associated heat of sorption. At the investigated pressures of chloroform vapor, the sorption process is dominated by exothermic adsorption of penetrating molecules in the nanocavities of the crystalline phase. The mass uptake kinetics has been compared with the kinetics of evolution of heat of sorption measured simultaneously. The integral heat of sorption evaluated calorimetrically has been compared to the corresponding value calculated by elaborating gravimetric sorption isotherms at several temperatures evaluated independently through gravimetric sorption experiments. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1675–1681, 2005
A study of the mechanical properties of randomly oriented short banana and sisal hybrid fiber reinforced polyester composites
Authors: Idicula Maries , Neelakantan N. R. , Oommen Zachariah , Joseph Kuruvilla , Thomas Sabu 
Published: March 2005

AbstractThe mechanical performance of short randomly oriented banana and sisal hybrid fiber reinforced polyester composites was investigated with reference to the relative volume fraction of the two fibers at a constant total fiber loading of 0.40 volume fraction (Vf), keeping banana as the skin material and sisal as the core material. A positive hybrid effect is observed in the flexural strength and flexural modulus of the hybrid composites. The tensile strength of the composites showed a positive hybrid effect when the relative volume fraction of the two fibers was varied, and maximum tensile strength was found to be in the hybrid composite having a ratio of banana and sisal 4 : 1. The impact strength of the composites was increased with increasing volume fraction of sisal. However, a negative hybrid effect is observed when the impact strength of the composites is considered. Keeping the relative volume fraction of the two fibers constant, that is, banana : sisal = 0.32 : 0.08 (i.e., 4 : 1), the fiber loading was optimized and different layering patterns were investigated. The impact strength of the composites was increased with fiber loading. Tensile and flexural properties were found to be better at 0.40 Vf. In the case of different layering patterns, the highest flexural strength was observed for the bilayer composites. Compared to other composites, the tensile properties were slightly higher for the composite having banana as the skin material and sisal as the core material. Scanning electron micrographs of the tensile and impact fracture surfaces of the hybrid composites having volume fraction 0.20 and 0.40 Vf were studied. The experimental tensile strength and tensile modulus of hybrid composites were compared with those of theoretical predictions. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1699–1709, 2005
Comparative analysis of webometric measurements in thematic environments
Authors: Faba‐Pérez Cristina , Zapico‐Alonso Felipe , Guerrero‐Bote Vicente P. , Moya‐Anegón Félix de 
Published: March 2005

AbstractThere have been many attempts to evaluate Web spaces on the basis of the information that they provide, their form or functionality, or even the importance given to each of them by the Web itself. The indicators that have been developed for this purpose fall into two groups: those based on the study of a Web space's formal characteristics, and those related to its link structure. In this study we examine most of the webometric indicators that have been proposed in the literature together with others of our own design by applying them to a set of thematically related Web spaces and analyzing the relationships between the different indicators.
Impact of personality on technology adoption: An empirical model
Authors: Vishwanath Arun 
Published: March 2005

AbstractAn innovator's personality along with the perceived attributes of an innovation predicts the rate of diffusion. The current study focuses on the personality factors that determine the likelihood of adoption of a technological innovation. To that end, the study distinguishes between global innovativeness and context‐specific innovativeness. An information processing model was tested where technological innovativeness was purported to be indirectly influenced by an individual's global innovativeness, through its impact on communication and media use behaviors. The structural model was tested on two separate technology clusters, and partial support was found for linking sophistication in information search, and prior technology ownership to technological innovativeness.
Homoserine‐derived cyclic sulfamidate as chiral educt for the diversity‐oriented synthesis of lactam‐bridged dipeptides
Authors: Galaud Fabrice , Lubell William D. 
Published: March 2005

AbstractIntroduction of structural constraint into peptides is an effective way for studying their conformation–activity relationships. Conformationally restrained dipeptidyl lactams, important building blocks for the synthesis of peptidomimetics, have now been synthesized from N‐[9‐(9‐phenylfluorenyl)]‐L‐aspartic acid α‐cumyl β‐methyl diester as an inexpensive chiral educt. After selective reduction of the β‐methyl ester with diisobutylaluminum hydride (DIBAL‐H), homoserine 6 was treated with thionyl chloride, imidazole, and triethylamine to give sulfamidites 7. Diastereoisomers 7 were separated by chromatography and oxidation of the major sulfamidite (2R,4S)‐7 with catalytic ruthenium trichloride afforded sulfamidate 8. A series of γ‐lactam‐bridged dipeptides was then obtained by ring opening of sulfamidate cumyl ester 8 with a series of amino esters, selective cumyl ester removal, and lactam formation. The resulting dipeptidyl lactams possessed aliphatic, aromatic, amino, thioether, and carboxylate side chains. A γ‐lactam analog of Pro–Leu–Gly–NH2 (PLG), 16, was synthesized to illustrate the potential for using this approach in the synthesis of biologically active peptide mimics. © 2005 Wiley Periodicals, Inc. Biopolymers (Pept Sci), 2005
Development of the projection from the nucleus of the brachium of the inferior colliculus to the superior colliculus in the ferret
Authors: Nodal Fernando R. , Doubell Timothy P. , Jiang Ze D. , Thompson Ian D. , King Andrew J. 
Published: March 2005

AbstractNeurons in the deeper layers of the superior colliculus (SC) have spatially tuned receptive fields that are arranged to form a map of auditory space. The spatial tuning of these neurons emerges gradually in an experience‐dependent manner after the onset of hearing, but the relative contributions of peripheral and central factors in this process of maturation are unknown. We have studied the postnatal development of the projection to the ferret SC from the nucleus of the brachium of the inferior colliculus (nBIC), its main source of auditory input, to determine whether the emergence of auditory map topography can be attributed to anatomical rewiring of this projection. The pattern of retrograde labeling produced by injections of fluorescent microspheres in the SC on postnatal day (P) 0 and just after the age of hearing onset (P29), showed that the nBIC‐SC projection is topographically organized in the rostrocaudal axis, along which sound azimuth is represented, from birth. Injections of biotinylated dextran amine‐fluorescein into the nBIC at different ages (P30, 60, and 90) labeled axons with numerous terminals and en passant boutons throughout the deeper layers of the SC. This labeling covered the entire mediolateral extent of the SC, but, in keeping with the pattern of retrograde labeling following microsphere injections in the SC, was more restricted rostrocaudally. No systematic changes were observed with age. The stability of the nBIC‐SC projection over this period suggests that developmental changes in auditory spatial tuning involve other processes, rather than a gross refinement of the projection from the nBIC. J. Comp. Neurol. 485:202–217, 2005. © 2005 Wiley‐Liss, Inc.
Expression of soluble guanylyl cyclase in rat cerebral cortex during postnatal development
Authors: Ding Jin‐Dong , Burette Alain , Weinberg Richard J. 
Published: March 2005

AbstractSoluble guanylyl cyclase (sGC), the principle “receptor” for nitric oxide (NO), catalyzes the formation of cyclic guanosine monophosphate (cGMP), an intracellular second messenger. Studies in invertebrates have shown that the NO/cGMP pathway is involved in several aspects of neural development, including neuronal migration, dendritic and axonal outgrowth, and synaptogenesis. In vitro studies suggest a developmental role also in mammals. To investigate whether the NO/cGMP pathway might mediate these processes in vivo, we performed immunohistochemistry for sGC on sections from postnatal rat cerebral cortex. Early in postnatal development, migrating neurons in the cortical plate were immunonegative, whereas neurons deeper in the cortex that had completed migration were immunopositive. At the subcellular level, sGC preferentially stained dendrites rather than axons, but, at postnatal day 1 (PND1), sGC was found in a large fraction of axonal growth cones, especially those oriented toward the pial surface. At PND10–20 (the period of maximal synaptogenesis), sGC immunostaining was located mainly in dendritic shafts and was only occasionally associated with spines or axon terminals. These results support a role for the NO/cGMP pathway in dendritic development but argue against a major role in neuronal migration and synaptogenesis. J. Comp. Neurol. 485:255–265, 2005. © 2005 Wiley‐Liss, Inc.
A unified method for eigendecomposition of graph products
Authors: Kaveh A. , Rahami H. 
Published: March 2005

AbstractIn this paper, a unified method is developed for calculating the eigenvalues of the weighted adjacency and Laplacian matrices of three different graph products. These products have many applications in computational mechanics, such as ordering, graph partitioning, and subdomaining of finite element models. Copyright © 2005 John Wiley & Sons, Ltd.
Comparative study of the continuous phase flow in a cyclone separator using different turbulence models
Authors: Shalaby H. , Pachler K. , Wozniak K. , Wozniak G. 
Published: March 2005

AbstractNumerical calculations were carried out at the apex cone and various axial positions of a gas cyclone separator for industrial applications. Two different NS‐solvers (a commercial one (CFX 4.4 ANSYS GmbH, Munich, Germany, CFX Solver Documentation, 1998), and a research code (Post‐doctoral Thesis, Technical University of Chemnitz, Germany, September, 2002)) based on a pressure correction algorithm of the SIMPLE method have been applied to predict the flow behaviour. The flow was assumed as unsteady, incompressible and isothermal. A k–ε turbulence model has been applied first using the commercial code to investigate the gas flow. Due to the nature of cyclone flows, which exhibit highly curved streamlines and anisotropic turbulence, advanced turbulence models such as Reynolds stress model (RSM) and large eddy simulation (LES) have been used as well. The RSM simulation was performed using the commercial package activating the Launder et al.'s (J. Fluid. Mech. 1975; 68(3):537–566) approach, while for the LES calculations the research code has been applied utilizing the Smagorinsky model. It was found that the k–ε model cannot predict flow phenomena inside the cyclone properly due to the strong curvature of the streamlines. The RSM results are comparable with LES results in the area of the apex cone plane. However, the application of the LES reveals qualitative agreement with the experimental data, but requires higher computer capacity and longer running times than RSM.This paper is organized into five sections. The first section consists of an introduction and a summary of previous work. Section 2 deals with turbulence modelling including the governing equations and the three turbulence models used. In Section 3, computational parameters are discussed such as computational grids, boundary conditions and the solution algorithm with respect to the use of MISTRAL/PartFlow‐3D. In Section 4, prediction profiles of the gas flow at axial and apex cone positions are presented and discussed. Section 5 summarizes and concludes the paper. Copyright © 2005 John Wiley & Sons, Ltd.
Nonlinearity and the permanent effects of recessions
Authors: Kim Chang‐Jin , Morley James , Piger Jeremy 
Published: March 2005

AbstractThis paper presents a new nonlinear time series model that captures a post‐recession ‘bounce‐back’ in the level of aggregate output. While a number of studies have examined this type of business cycle asymmetry using recession‐based dummy variables and threshold models, we relate the ‘bounce‐back’ effect to an endogenously estimated unobservable Markov‐switching state variable. When the model is applied to US real GDP, we find that the Markov‐switching regimes are closely related to NBER‐dated recessions and expansions. Also, the Markov‐switching form of nonlinearity is statistically significant and the ‘bounce‐back’ effect is large, implying that the permanent effects of recessions are small. Meanwhile, having accounted for the ‘bounce‐back’ effect, we find little or no remaining serial correlation in the data, suggesting that our model is sufficient to capture the defining features of US business cycle dynamics. When the model is applied to other countries, we find larger permanent effects of recessions. Copyright © 2005 John Wiley & Sons, Ltd.
Business and default cycles for credit risk
Authors: Koopman Siem Jan , Lucas André 
Published: March 2005

AbstractVarious economic theories are available to explain the existence of credit and default cycles. There remains empirical ambiguity, however, as to whether these cycles coincide. Recent papers suggest by their empirical research set‐up that they do, or at least that defaults and credit spreads tend to co‐move with macroeconomic variables. If true, this is important for credit risk management as well as for regulation and systemic risk management. In this paper, we use 1933–1997 US data on real GDP, credit spreads and business failure rates to shed new light on the empirical evidence. We use a multivariate unobserved components framework to disentangle credit and business cycles. We distinguish two types of cycles in the data, corresponding to periods of around 6 and 11–16 years, respectively. Cyclical co‐movements between GDP and business failures mainly arise at the longer frequency. At the higher frequency of 6 years, co‐cyclicality is less clear‐cut. We also show that spreads reveal a positive and negative co‐cyclicality with failure rates and GDP, respectively. This pattern disappears, however, if we concentrate on the post World War II period. We comment on the implications of our findings for credit risk management. Copyright © 2005 John Wiley & Sons, Ltd.
How well do Markov switching models describe actual business cycles? The case of synchronization
Authors: Smith Penelope A. , Summers Peter M. 
Published: March 2005

AbstractThe objective of this paper is to evaluate the effectiveness of using a Markov switching model to measure the synchronization of business cycles. We use a Bayesian, Gibbs sampling approach to estimate a multivariate Markov switching model of GDP growth for several countries. We look for evidence of synchronization across countries in the sense of common Markov states, covariance of impulses and a long‐run co‐integrating relationship. We then use the fitted data implied by the posterior distribution of the Markov switching VAR, in conjunction with a dating rule, to obtain the posterior distribution of binary business cycle states. We use these to investigate the posterior distributions of non‐parametric measures of synchronization described by Harding and Pagan (2003) and compare them with similar measures obtained from standard reference chronologies. As a point of reference, we repeat this exercise using simulated data from a linear VAR.We find no evidence of a common Markov state, but some evidence of the propagation of country‐specific disturbances across countries and of a co‐integrating relationship between the United States and Canada. Posterior odds ratios overwhelmingly favour the Markov switching model over the linear VAR and we find that the posterior distributions of the non‐parametric measures of synchronization produced by the Markov switching VAR match the data more closely than those produced by the linear VAR. Copyright © 2005 John Wiley & Sons, Ltd.
Help seeking and satisfaction among Latinas: The roles of setting, ethnic identity, and therapeutic alliance
Authors: Paris Manuel , Añez Luis M. , Bedregal Luis E. , Andrés‐Hyman Raquel C. , Davidson Larry 
Published: March 2005

AbstractThis study explored help seeking among primary Spanish speaking women of Hispanic origin who had behavioral health needs. We evaluated relational and cultural aspects of care and service utilization by using qualitative and quantitative measures of perceived behavioral health needs, therapeutic relationships, ethnic identity and degree of acculturation, and satisfaction with services among 103 women. We explored the nature of the therapeutic relationship and satisfaction with services among Latinas who received behavioral health services at: (1) a community behavioral health center, (2) a community health center, and (3) a faith‐based agency. Overall, results demonstrated that participants had strong therapeutic alliances and were satisfied with services at the three different treatment sites. Differences noted, including clinical and research implications, are also described. © 2005 Wiley Periodicals, Inc. J Comm Psychol 33: 299–312, 2005.
Implementing research‐based substance abuse prevention in communities: Effects of a coalition‐based prevention initiative in Vermont
Authors: Flewelling Robert L. , Austin David , Hale Kelly , LaPlante Marcia , Liebig Melissa , Piasecki Linda , Uerz Lori 
Published: March 2005

AbstractDespite the popularity and perceived potential effectiveness of community‐based coalitions in helping to prevent and reduce adolescent substance use, empirical evidence supporting this approach is sparse. Many reasons have been suggested for why coalition‐based prevention initiatives, and community‐level interventions in general, have not demonstrated stronger and more consistent results. Among these explanations are lack of uniformity and control over activities implemented by coalitions and inadequate numbers of communities used in evaluative studies. This article reports findings from the evaluation of a nonrandomized community trial in Vermont in which 23 community coalitions were funded for 3 years to select and implement a comprehensive mix of research‐based prevention strategies designed to reduce substance use prevalence among adolescents. Data from three successive biennial administrations of the statewide Youth Risk Behavior Survey were used to assess this goal. Across the communities served by these coalitions, greater reductions in student substance use prevalence were achieved, relative to the remainder of the state, for all nine substance use measures examined. The greatest relative reductions were observed for past‐30‐day use of marijuana and cigarettes (both p < .05). These findings suggest that collaborative community‐based efforts implemented within a supportive framework such as Vermont's New Directions project can have a meaningful impact on the prevalence of substance use behaviors among youth. © 2005 Wiley Periodicals, Inc. J Comm Psychol 33: 333–353, 2005.
The influence of pregnancy, sexually transmitted diseases, and human immunodeficiency virus perceived susceptibility patterns on sexual risk reduction for adolescent females
Authors: Kershaw Trace S. , Ethier Kathleen A. , Milan Stephanie , Lewis Jessica B. , Niccolai Linda M. , Meade Christina , Ickovics Jeannette R. 
Published: March 2005

AbstractRisky sexual behavior can lead to pregnancy, sexually transmitted diseases (STDs), and human immunodeficiency virus (HIV). Our study of 300 adolescent females takes an integrative approach by incorporating these multiple outcomes to assess the influence of risk perceptions on sexual behavior by (1) identifying subgroups of perceived susceptibility to pregnancy, STDs, and HIV using cluster analysis and (2) comparing subgroups on demographics, sexual history, sexual risk behavior over time, and subsequent STD acquisition. Results demonstrated five perceived susceptibility clusters (no susceptibility; high HIV; high pregnancy; high STD; and high multisusceptibility) that differed in three important ways: demographic and sexual history profiles, current sexual risk behavior, and subsequent STDs. Young women in the no susceptibility cluster had the lowest sexual risk and those in the high multisusceptibility cluster had the highest sexual risk and the highest number of subsequent STDs. There were no significant changes in sexual risk over time, regardless of cluster. © 2005 Wiley Periodicals, Inc. J Comm Psychol 33: 313–331, 2005.
Cover Picture: Macromol. Chem. Phys. 6/2005
Authors: Cottet Hervé , Biron Jean Philippe 
Published: March 2005

Cover: The figure shows two‐dimensional electrophoretic separation of ten polyelectrolytes, according to the charge density and the molecular mass, performed in a single capillary.Further details can be found in the Full Paper by H. Cottet* and J.‐P. Biron on page 628.
Hibiscus polyphenol‐rich extract induces apoptosis in human gastric carcinoma cells via p53 phosphorylation and p38 MAPK/FasL cascade pathway
Authors: Lin Hui‐Hsuan , Huang Hui‐Pei , Huang Chi‐Chou , Chen Jing‐Hsien , Wang Chau‐Jong 
Published: March 2005

AbstractIn view of the continuing need for effective anticancer agents, and the association of diet with reduced cancer risk, edible plants are increasingly being considered as sources of anticancer drugs. Hibiscus sabdariffa Linne (Malvaceae), an attractive plant believed to be native to Africa, is cultivated in the Sudan and Eastern Taiwan. Polyphenols had been demonstrated previously to possess antioxidative and antitumor promoting effects. In this study, investigations were conducted to examine the mechanism of the anticancer activity of H. sabdariffa L., Hibiscus polyphenol‐rich extracts (HPE). Using HPLC assay, HPE was demonstrated to contain various polyphenols. HPE induced cell death of eight kinds of cell lines in a concentration‐dependent manner. Among them human gastric carcinoma (AGS) cells were the most susceptible to HPE (0.95 mg/mL HPE inhibited its growth by 50%). Our results revealed that AGS cells underwent DNA fragmentation, and had an increase in the distribution of hypodiploid phase (apoptotic peak, 52.36%) after a 24‐h treatment with HPE (2.0 mg/mL). This effect of HPE in AGS cells might be mediated via p53 signaling and p38 MAPK/FasL cascade pathway, as demonstrated by an increase in the phosphorylation of p53 and the usage of a specific p38 inhibitor, SB203580. Thus, our data present the first evidence of HPE as an apoptosis inducer in AGS cells and these findings may open interesting perspectives to the strategy in human gastric cancer treatment. © 2005 Wiley‐Liss, Inc.