bluuebunny/crossref_metadata_2025_split huggingface dataset:
Predictors of the risk of cognitive deficiency in very preterm infants: the EPIPAGE prospective cohort
Authors: Beaino Ghada , Khoshnood Babak , Kaminski Monique , Marret Stéphane , Pierrat Véronique , Vieux Rachel , Thiriez Gérard , Matis Jacqueline , Picaud Jean‐Charles , Rozé Jean‐Christophe , Alberge Corine , Larroque Béatrice , Bréart Gérard , Ancel Pierre‐Yves ,   for the EPIPAGE Study Group
Published: January 2011

AbstractAim:  To assess cerebral lesions and other medical as well as social characteristics as predictors of risk of mild and severe cognitive deficiencies in very preterm infants.Methods:  As part of the EPIPAGE population‐based prospective cohort study, perinatal data and cognitive outcome at 5 years of age were recorded for 1503 infants born before 33 weeks of gestation in nine regions of France in 1997. Mild cognitive deficiency was defined as a Mental Processing Composite score on the Kaufman Assessment Battery for Children test of between 70 and 84, and severe cognitive deficiency as a score of <70.Results:  After controlling for cerebral lesions and other medical as well as social factors, low parental socio‐economic status and lack of breastfeeding were significant predictors of mild and severe cognitive deficiencies, whereas presence of cerebral lesions, being small for gestational age and having a large number of siblings were predictors of severe cognitive deficiency.Conclusion:  Predictors of poor cognitive outcome in very preterm infants are low social status, lack of breastfeeding, presence of cerebral lesions on ultrasound scan, being born small for gestational age and having a high number of siblings. Social factors predicted both mild and severe cognitive deficiencies, whereas medical factors predicted mostly severe cognitive deficiencies.
The Survival of the Muʿtazila Tradition of Qur'anic Exegesis in Shīʿī and Sunnī tafāsīr
Authors: Mourad Suleiman A. 
Published: January 2011

Like all other Islamic sects and movements, the Muʿtazilīs were very attentive to the study of the Qur'an and many among their ranks authored books on Qur'anic exegesis. Unfortunately, the overwhelming majority of tafāsīr compiled by Muʿtazilīs are not extant and, for a long time, the vast majority of the scholarly community has been under the impression that the only surviving Muʿtazilī tafsīr was al-Zamakhsharī’s Kashshāf. However, two other major Muʿtazilī tafāsīr have come to light, and now we can begin to determine the contribution of the Muʿtazilī exegetical tradition to the field of tafsīr. This study will argue that the demise of the Muʿtazila does not necessarily mean that their tradition of Qur'anic exegesis died out; nor for that matter their theology and religious thought. To this end, it will examine two cases that demonstrate that the Muʿtazilī tradition of Qur'anic exegesis was, at least to some extent, absorbed into the mainstream exegetical traditions of Twelver Shīʿism and Sunnism. The first case details the influence of al-Jishumī’s Tahdhīb on Majmaʿ al-bayān by the prominent Twelver Shīʿī exegete al-Ṭabrisī. The second shows the reliance of the paramount Sunnī theologian and philosopher Fakhr al-Dīn al-Rāzī in his Mafātīḥ al-ghayb on al-Kashshāf by al-Zamakhsharī.
An Observational, Prospective Survey Assessing the Control of Atrial Fibrillation in Asia Pacific: Rationale and Design of the RecordAF-AP Registry
Authors: Amerena John , Chen Shih-Ann , Sriratanasathavorn Charn , Cho Jeong-Gwan , Dejia Huang , Omar Razali , Fat Tse Hung , King Anthony 
Published: January 2011

Background The literature suggests that the prevalence of atrial fibrillation (AF) may be lower in Asian countries than in Western countries. Nevertheless, AF remains a significant public health problem in the region. The burden of AF, the experiences of previous trials and the lack of data on AF and its management in Asia Pacific highlight the need for a comprehensive prospective study of AF management. Methods The REgistry on Cardiac rhythm disORDers assessing the control of Atrial Fibrillation Asia Pacific (RecordAF-AP) is a prospective, observational survey of the management of recently diagnosed AF patients with 1-year follow-up in 8 countries across Asia Pacific. Eligible patients presenting with AF, treated or not, will be included in the registry and data will be recorded prospectively during follow-up visits at 6 and 12 months. Results RecordAF-AP will recruit more than 3000 patients. Study recruitment commenced in April 2009 and the final results anticipated at the end of 2011. Conclusions RecordAF-AP will assess the real-life management of AF patients in Asia Pacific, including a comparison of clinical outcomes in rhythm versus rate control strategies, providing much needed insight into the costs, treatment choices and clinical outcomes of AF patients in this region.
Theoretical and experimental study of the melting process of high‐density polyethylene for multidimensional vibration equipment
Authors: Zeng Guang‐Sheng , Qu Jin‐Ping , Liu Yue‐Jun 
Published: January 2011

AbstractA model for investigating the melting process under a vibration force field is presented. The key parameters of this model are as follows: the rotation of the screw and heat are supplied by the vibration force field for the material phase conversion. A multidimensional vibration desk (DWZD‐500) and low‐density polyethylene material were used to investigate the effect of the vibration parameters on the melting process. A comparison of the derived model and experimental results revealed that increasing the vibration parameters increased the melting mass. This study will serve as the theoretical basis to optimize the parameters of vibration extruders' processing polymers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Recycling of Poly(phenylene ether) Blends
Authors: Nerkar Manoj , Bandyopadhyay Sumanda , Kamalakaran Radha , Gupta Samik , Guo Hua 
Published: January 2011

AbstractThe effects of postindustry recycling of polymer blends composed of poly(phenylene ether) (PPE) on the properties of the PPE blends were investigated by simulated recycling with multiple molding cycles. Two compositions with different concentrations of PPE were reprocessed with an injection‐molding machine. Mechanical, thermal, rheological, and morphological characterizations were carried out on as‐produced and reprocessed samples to examine the influence of the number of molding cycles on the two specific PPE blends. Efforts were made to determine the effect of each molding cycle on the specific properties of the two PPE blends, including the Elastic (E), modulus, stress at break, strain at break, multiaxial impact, and melt viscosity. The results are discussed in detail. The retention of the properties correlated well with the unperturbed morphology of the compositions before and after recycling, as observed by transmission electron microscopy analyses on fractured tensile samples. However, more in‐depth microanalyses are required to identify the effect of recycling on the individual components present in the studied compositions. In this study, we aimed to establish structure–property relations upon recycling using several characterization techniques. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Formation of blisters in kapton polymer by the effect of 1.25 MeV gamma irradiation
Authors: Siddhartha  , Aarya Suveda , Mishra Monika , Srivastava A. K. , Wahab M. A. 
Published: January 2011

AbstractThe surface morphology, chemical, optical, and structural response of 1.25 MeV gamma rays irradiation at various doses ranging from 16 to 300 kGy on Kapton polymer samples were studied by using scanning electron microscope (SEM), Fourier Transform Infrared (FTIR), ultraviolet/visible absorption (UV/VIS) and X‐ray diffraction (XRD). The morphology study shows the blisters formation on the Kapton polymer surface due to 1.25 MeV gamma rays irradiation at ambient temperature. This observation provides a basis for the quantitative evaluation of FTIR results obtained for thermally stable polymer on the chemical bond deterioration with increasing gamma irradiation. The blistering mechanism is correlated with the internal gases (CO, H2) released due to gamma radiation induced damages. The recorded UV–VIS spectrum shows a maximum absorption around the wavelength 540 nm. However, the nature of the spectra does not change due to gamma irradiation but a shift in absorption edge towards the higher wavelength side has been observed with increasing dose. The optical data shows an increase in the calculated band gap at the highest dose. The diffraction pattern of virgin sample shows that polymer is semicrystalline, but due to irradiation, a decrease in the peak intensity and FWHM and an increase in the crystallite size at the highest dose level of 300 kGy have been observed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Bacterial cellulose/collagen composite: Characterization and first evaluation of cytocompatibility
Authors: Zhijiang Cai , Guang Yang 
Published: January 2011

AbstractThe novel bacterial cellulose (BC)/collagen composites were prepared by immersing wet BC pellicle excreted by Acetobacter xylinum in collagen solution followed by freeze‐drying process. The product looks like a foam structure. The morphology of BC/collagen composite was examined by scanning electron microscope (SEM) and compared with pristine BC. SEM images showed that collagen molecules was not only coated on the BC fibrils surface but also could penetrate inside BC and hydrogen bond interactions were formed between BC and collagen. The prepared BC/collagen composite was also characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), thermogravimetric analysis (TGA), and mechanical test. With the incorporation of collagen in the BC, no changes happened in the crystal structure but the thermal stability was improved. Tensile test results indicate that the Young's Modulus and tensile strength have a big increase while the elongation at break has a slight decrease. The cytocompatibility of composite was preliminarily evaluated by cell adhesion studies. The tests were carried out using 3T3 fibroblast cells. The cells incubated with BC/collagen scaffolds for 48 h were capable of forming cell adhesion and proliferation. It showed much better cytocompatibility than pure BC. So, the prepared BC/collagen scaffolds are bioactive and may be suitable for cell adhesion/attachment suggesting that these scaffolds can be used for wound dressing or tissue‐engineering scaffolds. Therefore, these results suggest that these novel BC/collagen scaffolds may have the potential to be sued for some biomedical applications. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Thermogravimetric and resistivity study of Ex situ and In situ poly(methyl methacrylate)/carboxylic acid group functionalized multiwall carbon nanotubes composites
Authors: Das Mahuya , Ray Dipa , Bandyopadhyay Sri , Banerjee Sourish , Bandyopadhyay Nil R. , Basumallik Amitava 
Published: January 2011

AbstractPolymer composites based on poly(methyl methacrylate) (PMMA)/carboxylic acid group functionalized multiwall carbon nanotubes (MWCNT) were prepared by the ex situ and in situ techniques with 0.05% loading by weight. Composite films were fabricated by solvent casting method. Electrical conductivity of the composites as well as of the neat PMMA polymer was measured in the temperature range 333 K to 423 K. Neat PMMA samples prepared by the same method showed complete insulating behavior. Ex situ technique leads to a lower value of percolation threshold. Infrared spectroscopy was used to analyze the effect of functionalization of MWCNT on the interfacial bonding of PMMA and MWCNT. Thermogravimetric analysis revealed that the maximum degradation temperature has been shifted to higher region for in situ composites compared to PMMA itself—and the ex situ composites indicated better thermal stability. X‐ray diffraction study of composites also indicates that in situ composites functionalization incorporated MWCNT particles in the polymer chain. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Microwave‐induced devulcanization for poly(ethylene–propylene–diene) recycling
Authors: Bani Alberto , Polacco Giovanni , Gallone Giuseppe 
Published: January 2011

AbstractThe production of high quantities of end‐of‐life rubbers is an environmental problem of growing importance. Because of their crosslinked nature, such rubbers cannot be easily reprocessed, and actually, they are mainly wasted or reused after a simple mechanical grinding. In this study, a microwave (MW)‐induced thermal treatment at temperatures above 300°C was proposed to obtain partial devulcanization of a poly(ethylene–propylene–diene) (EPDM) rubber filled with carbon black. The use of MWs showed to be a very fast and simple technique, which allowed the production of a treated rubber with a relatively low degree of crosslinking, a slight revulcanization ability, and suitability for reuse in conjunction with virgin rubber. Preliminary mechanical characterization, performed on the revulcanized samples, indicated that the virgin and treated rubber were able to establish a good interface adhesion, which led to performances better than those of similar materials where the recycled part was made of ground untreated EPDM. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Characterization of monodisperse copolymer submicrospheres with branched structures and different glass‐transition temperatures prepared by soap‐free emulsion polymerization
Authors: Liu Yi‐Yu , Lo Ming‐Yu , Chen Hui 
Published: January 2011

AbstractThis study was focused on the synthesis of monodisperse poly(n‐butyl methacrylate‐co‐methyl methacrylate) submicrospheres via soap‐free emulsion polymerization and on their characterization. The glass‐transition temperatures of poly(n‐butyl methacrylate) and poly(methyl methacrylate) were approximately 25 and 110°C, respectively. Therefore, submicrospheres with different glass‐transition temperatures could be obtained through the variation of the copolymer composition. In addition, relationships between the monomer feed concentration (M0) and the Mark–Houwink constant (α) for the copolymer submicrospheres were proposed. The molecular weights of the copolymer submicrospheres decreased sharply with an increase in the weight fraction of n‐butyl methacrylate. On the contrary, the particle diameter increased linearly from 277 to 335 nm with an increase in the weight fraction of n‐butyl methacrylate. The α values decreased with an increase in M0, and this indicated that the branched structures of the copolymer submicrospheres were easily obtained when M0 was higher than 0.11 g/mL of water. Consequently, the results of this study are expected to provide useful information for the synthesis of monodisperse copolymer submicrospheres by soap‐free emulsion polymerization. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Preparation and characterization of novel crosslinked poly[glycidyl methacrylate–poly(ethylene glycol) methyl ether methacrylate] as gel polymer electrolytes
Authors: Luo Dan , Li Yang , Yang Mujie 
Published: January 2011

AbstractIn this study, glycidyl methacrylate was copolymerized with poly(ethylene glycol) methyl ether methacrylate to obtain a copolymer {poly[glycidyl methacrylate–poly(ethylene glycol) methyl ether methacrylate] [P(GMA–PEGMA)]}, which was crosslinked with α,ω‐diamino poly(propylene oxide) (Jeffamine) at various weight ratios and molecular weights to form novel gel polymer electrolytes (GPEs). The crosslinked copolymers were characterized by Fourier transform infrared spectroscopy and thermal analysis. The crosslinked polymers were amorphous in the pristine state and became crystallized after they were doped with lithium electrolyte. Furthermore, the crosslinking degree of the crosslinked polymers increased with increasing weight ratio of Jeffamine, and both the swelling properties and mechanical behaviors of the crosslinked polymers were heavily affected by the weight ratio and molecular weight of Jeffamine. The ionic conductivity (σ) of the GPEs from the crosslinked copolymers was determined by alternating‐current impedance spectroscopy. A higher molecular weight and increased weight ratio of Jeffamine resulted in a higher σ. The GPE based on P(GMA–PEGMA) crosslinked with an equal weight of Jeffamine D2000 exhibited the highest σ of 8.29 × 10−4 S/cm at 25°C and had a moderate mechanical strength. These crosslinked copolymers could be potential candidates for the construction of rechargeable lithium batteries. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Synthesis, characterization, and properties of degradable poly(l‐lactic acid)/poly(butylene terephthalate) copolyesters containing 1,4‐cyclohexanedimethanol
Authors: Wang Bingtao , Zhang Yan , Song Pingan , Guo Zhenghong , Cheng Jie , Fang Zhengping 
Published: January 2011

AbstractHigh‐molecular‐weight copolyesters based on poly(butylene terephthalate) as rigid aromatic segments and poly(l‐lactic acid) (PLLA) as degradable aliphatic segments were synthesized via the polycondensation of terephthalic acid, 1,4‐butanediol (BDO), 1,4‐cyclohexanedimethanol (CHDM), and PLLA oligomer. By tailoring the molar ratio of diols (BDO and CHDM), we investigated in detail the effects of the CHDM rigid hexacyclic ring on the synthesis, mechanical properties, thermal stabilities, and degradation behaviors of the copolyesters. With increasing CHDM content, the initial decomposition temperature increased from 282.5 to 322.2°C, and the tensile strength improved by nearly four times, from 5.4 to 19 MPa. When the molar ratio of BDO/CHDM was 95/5, the weight‐average molecular weight of the copolyester was 89,400 g/mol with a polydispersity of 1.96. In addition, hydrolytic degradation results in phosphate buffer solution indicate that the degradation rate of the copolyesters displayed a strong dependency on the temperature and CHDM composition. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Viscoelastic relaxation of styrene–butadiene–styrene block copolymers with different topological structures
Authors: Du Miao , Yu Qiuming , Lu Yi , Zheng Qiang 
Published: January 2011

AbstractThe viscoelastic relaxation of linear styrene–butadiene–styrene triblock copolymer (l‐SBS) and star styrene–butadiene–styrene triblock copolymer (s‐SBS) with four arms were investigated with differential scanning calorimetry and dynamic rheological measurements. Three characteristic viscoelastic responses of l‐SBS and s‐SBS in the plot of the loss tangent (tan δ) and temperature at different frequencies (ω's), which corresponded to the relaxation of the polybutadiene (PB) block (peak I), the glass transition of the polystyrene (PS) phase (peak II), and the mutual diffusion between the PB blocks and PS blocks (peak III), respectively, were observed in the experimental range. Although ω was 0.1 rad/s, a noticeable peak III was gained for both l‐SBS and s‐SBS. The dynamic storage modulus (G′) of l‐SBS showed two distinct types of behavior, depending on the temperature. At temperature (T) < T2 (where T2 is the temperature corresponding to peak II), G′ of l‐SBS displayed a very weak ω dependency. In contrast, at T > T2, G′ decayed much more rapidly. However, G′ of s‐SBS displayed a very weak ω dependency at both T < T2 and T > T2. Only near T2 did s‐SBS decay with ω a little sharply. These indicated, in contrast to l‐SBS, that s‐SBS still exhibited more elasticity even at T > T2 because of its crosslinking point between the PB blocks (the star structure). In the lower ω range, l‐SBS exhibited a stronger peak III than s‐SBS despite the same styrene content for l‐SBS and s‐SBS. The high tan δ value of peak III for l‐SBS was considered to be related to the internal friction among the PB blocks or the whole l‐SBS chain, not the PS blocks. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
The effect of pH on the removal of anionic dyes from colored textile wastewater using a biosorbent
Authors: Mahmoodi Niyaz Mohammad , Arami Mokhtar , Bahrami Hajir , Khorramfar Shooka 
Published: January 2011

AbstractThe effect of pH on equilibrium and kinetics of dye adsorption onto canola hull as a biosorbent was studied. Reactive Red 198 (RR198), Reactive Blue 19 (RB19), Direct Red 79 (DR79), and Direct Red 80 (DR80) were used as model textile dyes. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and UV–vis spectroscopy were used. The presence of functional groups onto canola hull was investigated using FTIR spectroscopy. The pseudo first‐order, pseudo second‐order and intraparticle diffusion kinetics models were examined to evaluate the kinetics data. The Langmuir, Freundlich, and Tempkin adsorption isotherm models were applied to describe the equilibrium isotherms. The FTIR spectrum proved the presence of functional groups such as hydroxyl and amino groups in canola hull surface. The results showed that the adsorption of RR198, RB19, DR79, and DR80 onto canola hull followed Tempkin isotherm. Adsorption kinetic of dyes followed pseudo second‐order kinetics. Desorption tests showed maximum dye releasing of 88% for RR198, 86% for RB19, 91% for DR79, and 95% for DR80 at pH 12. Data showed that canola hull could be used as a novel natural material for the removal of anionic dyes from wastewater. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Preparation and characterization of hydrophilic, spectroscopic, and kinetic properties of hydrogels based on polyacrylamide and methylcellulose polysaccharide
Authors: Aouada Fauze Ahmad , Moura Márcia Regina de , Lopes da Silva Wilson Tadeu , Muniz Edvani Curti , Mattoso Luiz Henrique Capparelli 
Published: January 2011

AbstractHydrogels with potential technological applications has been prepared using polyacrylamide (PAAm) and methylcellulose (MC) polymers by free radical polymerization reaction. The spectroscopic, morphological, swelling, and kinetic properties were investigated by solid state 13C VACP‐MAS nuclear magnetic resonance (NMR), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), water uptake (WU) measurements, respectively. FTIR and NMR analysis confirmed the formation of semi‐IPN structured hydrogel. Data from WU and SEM revealed that the addition of MC into the solution‐forming hydrogel leads to increase in average pore size and hydrophilicity. By varying of AAm, MC, pH and ionic‐strength of swelling medium, it was possible to obtain hydrogels with hydrophilic properties controlled and optimized. The water uptake mechanism is dependent of the AAm concentration, which can follow the Fickian diffusion and anomalous transport process. In this way, PAAm‐MC hydrogels are promising materials for technological applications, such as agricultural field. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Electrical conductivity and major mechanical and thermal properties of carbon nanotube‐filled polyurethane foams
Authors: Yan Ding‐Xiang , Dai Kun , Xiang Zhi‐Dong , Li Zhong‐Ming , Ji Xu , Zhang Wei‐Qin 
Published: January 2011

AbstractThe carbon nanotubes (CNTs)/rigid polyurethane (PU) foam composites with a low percolation threshold of ∼ 1.2 wt % were prepared by constructing effective conductive paths with homogeneous dispersion of the CNTs in both the cell walls and struts of the PU foam. The conductive foam presented excellent electrical stability under various temperature fields, highlighting the potential applications for a long‐term use over a wide temperature range from 20 to 180°C. Compression measurements and dynamical mechanical analysis indicated 31% improvement in compression properties and 50% increase in storage modulus at room temperature in the presence of CNTs (2.0 wt %). Additionally, the incorporation of only 0.5 wt % CNTs induced remarkable thermal stabilization of the matrix, with the degradation temperature increasing from 450 to 499°C at the 50% weight loss. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011