bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of incorporation of graphene oxide and graphene nanoplatelets on mechanical and gas permeability properties of poly(lactic acid) films
Authors: Pinto Artur M , Cabral Joana , Tanaka David A. Pacheco , Mendes Adélio M , Magalhães Fernão D 
Published: June 2012

AbstractNanocomposite thin films of poly(lactic acid) (PLA) were produced incorporating small amounts (0.2 to 1 wt%) of graphene oxide (GO) and graphene nanoplatelets (GNP). The films were prepared by solvent‐casting. Mechanical properties were evaluated for plasticized (by residual solvent) and unplasticized films. Plasticized nanocomposite films presented yield strength and Young's modulus about 100% higher than those of pristine PLA. For unplasticized films improvements in tensile strength and Young's modulus were about 15 and 85%, respectively. For both film types, a maximum in mechanical performance was identified for about 0.4 wt% loadings of the two filler materials tested. Permeabilities towards oxygen and nitrogen decreased, respectively, three‐ and fourfold in films loaded with both GO or GNP. The glass transition temperature showed maximum increases, in relation to unloaded PLA films, of 5 °C for 0.4 wt% GO and 7 °C for 0.4 wt% GNP, coinciding with the observed maxima in mechanical properties. Copyright © 2012 Society of Chemical Industry
Synthesis and polymerization reactions of cyclic imino ethers. VI. Polymers with biphenyl structure
Authors: Lustoň Jozef , Kronek Juraj , Kleinová Angela , Janigová Ivica , Valentová Helena , Nedbal Jan 
Published: June 2012

AbstractA monomer of the AB‐type and a bifunctional comonomer of the AA‐type containing two 2‐oxazoline rings and a biphenyl structural unit were prepared from the corresponding carboxylic acids via their esterification and subsequent amidation with an aminoalcohol. The cyclization of an amide to 2‐oxazoline structure was achieved by treatment with thionyl chloride followed by liberation of the free base with sodium hydrocarbonate in an aqueous solution. The prepared monomers were used for the polyaddition polymerization of the AB‐type monomer having a 2‐oxazoline and phenol group bound on adjacent rings of the biphenyl structure in solution. The monomer of the AA‐type was used for AA+BB‐type polyaddition reactions with aliphatic dicarboxylic acids. Both types of polymerizations have been performed in melt and in solution. The structures of the polymers were determined, and the thermal properties of the polymers were evaluated. Liquid‐crystalline (LC) structures of the prepared polymers were observed by DSC measurements and optical microscopy. The polyaddition reactions of the monomers containing a 2‐oxazoline ring and a biphenyl unit represent a new efficient way for the preparation of a biphenyl unit containing poly(ether amide)s and poly(ester amide)s. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
Synthesis of poly(vinyl laurate)‐b‐poly(vinyl stearate) diblock copolymers by cobalt‐mediated radical polymerization in solution
Authors: Nzé René‐Ponce , Colombani Olivier , Nicol Erwan 
Published: June 2012

AbstractPoly(vinyl laurate) (PVL) and poly(vinyl stearate) (PVS) were synthesized by means of cobalt‐mediated radical polymerization (CMRP). Cobalt(II) diacetylacetonate (Co(acac)2) was demonstrated to control the radical polymerization of these monomers in solution. Molecular weights up to 15,000 g·mol−1 were obtained with reasonably low polydispersity indices (PDI < 1.3). The efficiency of the redox initiator [lauroyle peroxide (LPO)/citric acid (CA)] was found to be low (around 10%) as already reported for vinyl acetate. The solvent and temperature were found to have a very weak influence on the initiator efficiency. It appeared that CA played no role in the initiation process that only involved a redox reaction between LPO and Co(acac)2. PVL‐b‐PVS diblock copolymers could be synthesized using two strategies: (1) Sequential addition, that is, addition of the second monomer (VS) at high conversion of the first one (VL). (2) Macroinitiator technique, that is, isolation of a PVL macroinitiator then polymerization of VS from this cobalt functionalized macroinitiator. Both techniques allowed the synthesis of diblock copolymers with molar masses around 25,000 g·mol−1 and PDI lower than 1.4. The resulting materials were characterized by DSC, revealing that both blocks exhibit side‐chain crystallinity and phase segregate in the bulk. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
A phase‐separable second‐generation hoveyda‐grubbs catalyst for ring‐opening metathesis polymerization
Authors: Al‐Hashimi Mohammed , Hongfa Chayanant , George Beena , Bazzi Hassan S. , Bergbreiter David E. 
Published: June 2012

AbstractPolyisobutylene‐supported second‐generation Hoveyda‐Grubbs catalyst is shown to be an effective nonpolar phase tag for ring‐opening metathesis polymerization (ROMP). The catalytic activities of the supported Ru–carbene complex in ROMP are comparable to those of their homogeneous counterparts. The separability of these catalysts leads to lower Ru contamination (0.5 ppm levels) in the polymer products in comparison to the nonsupported Hoveyda‐Grubbs catalyst (10 PPM). © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
A novel Germline mutation in HOXB13 is associated with prostate cancer risk in Chinese men
Authors: Lin Xiaoling , Qu Lianxi , Chen Zhuo , Xu Chuanliang , Ye Dingwei , Shao Qiang , Wang Xiang , Qi Jun , Chen Zhiwen , Zhou Fangjian , Wang Meilin , Wang Zhong , He Dalin , Wu Denglong , Gao Xin , Yuan Jianlin , Wang Gongxian , Xu Yong , Wang Guozeng , Dong Pei , Jiao Yang , Yang Jin , Ou‐Yang Jun , Jiang Haowen , Zhu Yao , Ren Shancheng , Zhang Zhengdong , Yin Changjun , Wu Qijun , Zheng Ying , Turner Aubrey R. , Tao Sha , Na Rong , Ding Qiang , Lu Daru , Shi Rong , Sun Jielin , Liu Fang , Zheng S. Lilly , Mo Zengnan , Sun Yinghao , Xu Jianfeng 
Published: June 2012

AbstractBACKGROUNDA rare mutation G84E in HOXB13 was recently identified to be associated with prostate cancer (PCa) in Caucasians. The goal of this study is to test association between HOXB13 genetic variants and PCa risk in Chinese men.METHODSAll study subjects were part of the Chinese Consortium for Prostate Cancer Genetics (ChinaPCa). In the first stage, we screened for mutations by sequencing the HOXB13 coding region in 96 unrelated PCa patients. In stage 2, G84E and novel mutations found in stage 1 were genotyped in 671 PCa patients and 1,536 controls. In stage 3, mutation status in 751 additional PCa patients was imputed via haplotype.RESULTSThe G84E mutation was not detected in this study. However, a novel mutation, G135E, was identified among 96 patients in stage 1. It was also observed twice in 575 additional PCa patients but not in 1,536 control subjects of stage 2. The frequency of G135E was significantly different between cases and controls, with a P‐value of 0.027, based on Fisher's exact test. Haplotype estimation showed that G135E mutation carriers shared a unique haplotype that was not observed in other subjects. In stage 3, two more PCa patients were predicted to carry the G135E mutation.CONCLUSIONSWe identified a novel rare mutation in the HOXB13 gene, G135E, which appears to be a founder mutation. This mutation is associated with increased PCa risk in Chinese men. Consistent with a previous report, our findings provide further evidence that rare mutations in HOXB13 contribute to PCa risk. Prostate 73: 169–175, 2013. © 2012 Wiley Periodicals, Inc.
Immigration Detention in the Community: Research on the Experiences of Migrants Released from Detention Centres in the UK
Authors: Klein Axel , Williams Lucy 
Published: June 2012

ABSTRACTThis paper argues that immigration detention results in immigration detainees being treated as anomalies within the liberal, democratic state – not only within detention centres but also post‐release. Given that most released detainees remain destitute and without entitlement or resolution of their immigration cases, many report feelings of being continuously ‘detained’ even after release. This paper addresses a gap in the literature on the ongoing experience of released detainees. The authors draw on qualitative interview data from former detainees as a first step towards a better understanding of the issues.We discuss wider questions of why the detention regime fails to prepare detainees for release as well as how this omission can undermine their capacity to lead productive and socially meaningful lives. This paper argues that the lack of concern for the well‐being of former immigration detainees has considerable and far‐reaching implications for the former detainees and their communities. Finally, we link the situation of former detainees and their liminal states of exception, to discourses of slavery and civil death. Copyright © 2012 John Wiley & Sons, Ltd.
Enabling interoperation between Shibboleth and Information Card systems
Authors: Al‐Sinani Haitham S. , Mitchell Chris J. 
Published: June 2012

ABSTRACTWhilst the growing number of identity management systems have the potential to reduce the threat of identity attacks, major deployment problems remain because of the lack of interoperability between such systems. In this paper, we propose a scheme to provide interoperability between two widely discussed identity systems, namely Shibboleth and Information Card systems such as CardSpace or Higgins. When using this scheme, Information Card users are able to obtain an assertion token from a Shibboleth‐enabled identity provider that can be processed by an Information Card‐enabled relying party. The scheme is based on a browser extension and operates with both the CardSpace and the Higgins identity selectors without any modification. We specify the operation of the scheme and also describe an implementation of a proof‐of‐concept prototype. Additionally, security and operational analyses are provided. Copyright © 2012 John Wiley & Sons, Ltd.
Predicate encryption for multi‐inner‐products
Authors: Sun Dongdong , Boyd Colin , Nieto Juan Manuel Gonzalez 
Published: June 2012

ABSTRACTPredicate encryption is a new primitive that supports flexible control over access to encrypted data. We study predicate encryption systems, evaluating a wide class of predicates. Our systems are more expressive than the existing attribute‐hiding systems in the sense that the proposed constructions support not only all existing predicate evaluations but also arbitrary conjunctions and disjunctions of comparison and subset queries. Toward our goal, we propose encryption schemes supporting multi‐inner‐product predicate and provide formal security analysis. We show how to apply the proposed schemes to achieve all those predicate evaluations. Copyright © 2012 John Wiley & Sons, Ltd.
Reversible secret image sharing with steganography and dynamic embedding
Authors: Hu Wei‐Tong , Li Ming‐Chu , Guo Cheng , Ren Yi‐Zhi 
Published: June 2012

ABSTRACTMany traditional steganography methods do not disperse and hide secret data smoothly over all the capacity of cover images. Rather, they severely modify part of the cover image(s) to embed secret data, which results in stego images that have poor visual quality. In addition, there are still some secret image‐sharing approaches that cannot reveal the secret image losslessly without pixel expansion or extra storage or restore distortion‐free cover image(s) if they use steganography. In this paper, a novel scheme, which is based on Shamir's (t, n)‐threshold scheme (1979) and Galois Field GF(28) and uses dynamic embedding and least significant bit construction, is proposed to solve the issues mentioned above. Our experimental results showed that the dynamic embedding performance in our scheme was satisfactory and that both the secret image and the cover image can be restored losslessly without pixel expansion or extra storage. Copyright © 2012 John Wiley & Sons, Ltd.
Efficient chosen ciphertext secure public‐key encryption under factoring assumption
Authors: Qin Baodong , Liu Shengli 
Published: June 2012

ABSTRACTIn EUROCRYPT 2009, Hofheinz and Kiltz introduced a new practical chosen ciphertext secure public‐key encryption scheme under the assumption that factoring is intractable. They also proposed a variant that features a slightly more efficient decryption but unfortunately leads to large public key, of size about O(k), where k is a security parameter. In this paper, we propose a novel method to balance the efficiency and the key size of those previous two schemes. Although the public key in our scheme only consists of one RSA modulus and three group elements, it is still more efficient at decrypting than Hofheinz and Kiltz's scheme. By remarking that under certain assumptions factoring the modulus is still hard over much smaller subgroups of signed quadratic residues (i.e., semismooth subgroup), we were able to construct a new scheme that performs extremely efficient decryption. In fact, to date, this is the most efficient scheme for decryption among all public‐key encryption schemes (mainly including Hofheinz and Kiltz's schemes and their follow‐up works) whose security against chosen ciphertext attacks is based on the intractability of factoring in the standard model. Copyright © 2012 John Wiley & Sons, Ltd.
Security in application layer of radar sensor networks: detect friends or foe
Authors: Cao Zongjie , Chen Lijia 
Published: June 2012

AbstractBecause accurate identification cannot be obtained when the Identification Friend or Foe (IFF) sensor is employed separately, a radar sensor network (RSN) is designed to improve the identification capability in this paper. The content of this paper is focused on the information fusion algorithm, which is one of the key technologies in the RSN. The fuzzy c‐means and the Bayesian network are chosen as the fusion algorithm. This algorithm can implement the identification friend or foe automatically after being trained by the training samples and expert's experience, and reduce the effect of uncertainties in the process of identification. At the same time, the algorithm can update the identification result with the augmentation of observations. The RSN can be expanded, if more information can be obtained, to adapt to the complicated environment, on the basis of this algorithm. The simulation results prove the validity and efficiency of the algorithm. Copyright © 2012 John Wiley & Sons, Ltd.
A survey of accountability in computer networks and distributed systems
Authors: Xiao Zhifeng , Kathiresshan Nandhakumar , Xiao Yang 
Published: June 2012

AbstractSecurity in computer systems has been a major concern since the very beginning. Although security has been addressed in various aspects, accountability is one of the main facets of security that is lacking in today's computer systems. The ability not only to detect errors but also to find the responsible entity/entities for the failure is crucial. In this paper, we intend to provide a comprehensive investigation of the state‐of‐the‐art accountability research issues in current information systems. Also, we study the various accountability tactics that are available and how each one of them contributes to providing strong accountability of different aspects. Finally, we examine the various merits and tradeoffs. Copyright © 2012 John Wiley & Sons, Ltd.
Simple SMS spam filtering on independent mobile phone
Authors: Taufiq Nuruzzaman M. , Lee Changmoo , Abdullah Mohd. Fikri Azli bin , Choi Deokjai 
Published: June 2012

ABSTRACTThe amount of Short Message Service (SMS) spam is increasing. Various solutions to filter SMS spam on mobile phones have been proposed. Most of these use Text Classification techniques that consist of training, filtering, and updating processes. However, they require a computer or a large amount of SMS data in advance to filter SMS spam, especially for the training. This increases hardware maintenance and communication costs. Thus, we propose to filter SMS spam on independent mobile phones using Text Classification techniques. The training, filtering, and updating processes are performed on an independent mobile phone. The mobile phone has storage, memory and CPU limitations compared with a computer. As such, we apply a probabilistic Naïve Bayes classifier using word occurrences for screening because of its simplicity and fast performance. Our experiment on an Android mobile phone shows that it can filter SMS spam with reasonable accuracy, minimum storage consumption, and acceptable processing time without support from a computer or using a large amount of SMS data for training. Thus, we conclude that filtering SMS spam can be performed on independent mobile phones. We can reduce the number of word attributes by almost 50% without reducing accuracy significantly, using our usability‐based approach. Copyright © 2012 John Wiley & Sons, Ltd.
Synthesis, Crystal Structure, and Properties of a Cadmium(II) Complex with the Flexible Ligand (1′H‐[2, 2′]Biimidazoly‐1‐yl)‐acetic Acid
Authors: Wang Jun , Tao Jian‐Qing , Xu Xiao‐Juan , Tan Chun‐Yun 
Published: June 2012

AbstractA novel coordination polymer {[Cd(BDAC)]2·H2O}n (1) [HBDAC = (1′H‐[2, 2′]biimidazoly‐1‐yl)‐acetic acid] was synthesized under hydrothermal conditions and characterized by elemental analysis and single‐crystal X‐ray diffraction. Complex 1 crystallizes in the acentric orthorhombic space group Ccc2. The Cd1 atoms and BDAC2– ligands construct [Cd1(BDAC)] rhomboid grid (4, 4)‐topology layer motifs, whereas the Cd2 atoms and BDAC2– ligands form [Cd2(BDAC)] 1D coordination polymer ribbons. Furthermore, adjacent lay motifs are linked into 3D net structures by 1D coordination polymer ribbons with 4‐connected 3D trinodal {4282102}{4462}{43628}2 topology. The measurement of electric hysteresis loops indicated that complex 1 displays a ferroelectric characteristic.
A New Mixed‐Valence Tetranuclear Manganese [MnII2MnIII2] Cluster
Authors: Shao Cong‐Ying , Zhu Li‐Li , Yang Pei‐Pei 
Published: June 2012

AbstractA new tetranuclear manganese complex [Mn2IIMn2III(bhmcpH)2(hmp)4Cl2(MeOH)2] (1) [bhmcpH3 = 2, 6‐bis(hydroxymethyl)‐4‐chlorophenol, hmpH = 2‐(hydroxymethyl)pyridine] was synthesized and characterized. X‐ray diffraction analyses reveal that complex 1 crystallizes in the monoclinic space group P21/c. It has a mixed‐valence tetranuclear dicubane unit, which comprises two MnII and two MnIII ions. The temperature dependence of the magnetic susceptibilities of 1 indicates ferromagnetic interactions between the manganese ions.
Pentacoordinate Silicon Complexes with N‐(2‐pyridylmethyl)­salicylamide as a Dianionic (ONN′) Tridentate Chelator
Authors: Schwarz Dana , Brendler Erica , Kroke Edwin , Wagler Jörg 
Published: June 2012

AbstractThe title compound, N‐(2‐pyridylmethyl)salicylamide (1), was synthesized by ester aminolysis of methyl salicylate and 2‐picolylamine. In the presence of triethylamine as a supporting base, the salicylamide moiety reacts with the organodichlorosilanes RR′SiCl2 to form the desired six‐membered heterocycles of the type RR′Si–O–(o‐C6H4)–C(=O)N(pic), with pic being the 2‐pyridylmethyl (i.e., 2‐picolyl) moiety and RR′ = Me, Me (2a); Me, Ph (2b); Ph, Ph (2c); Bn, Bn (2d); All, Ph (2e) and Ph, H (2f). Despite the absence of notable ring strain release Lewis acidity (i.e., only a six‐membered chelate is formed by the dianion, and smaller rings are not present in the compound), the poor electron withdrawal from silicon by its C– or H– substituents and the flexible methylene bridge between the salicylamide and the pyridine moiety, the pyridine N donor atom furnishes pentacoordinate silicon coordination spheres in all of these compounds 2a–2f. The coordination number of the silicon atom was confirmed by single‐crystal X‐ray diffraction analysis for the solid state and by 29Si NMR spectroscopy for the solution state.
The Zintl Phases Eu3Mg5Si5 and Eu3Mg5Ge5
Authors: Schellenberg Inga , Eul Matthias , Schwickert Christian , Kubata Christof M. , Cuervo Reyes Eduardo , Nesper Reinhard , Rodewald Ute Ch. , Pöttgen Rainer 
Published: June 2012

AbstractThe Zintl phases Eu3Mg5Si5 and Eu3Mg5Ge5 were synthesized by high‐frequency melting of the elements in sealed tantalum tubes. Both of their structures have been refined from X‐ray single crystal diffractometer data: Sr12Mg17.8Li2.2Si20 type, Pnma, a = 1424.3(1), b = 450.5(2), c = 1821.4(2) pm, wR2 = 0.0544, 1995 F2 values, 80 variables for Eu3Mg5Si5 and a = 1445.8(2), b = 452.9(1), c = 1845.0(2) pm, wR2 = 0.0375, 2053 F2 values, 80 variables for Eu3Mg5Ge5. The electron precise Zintl phases [Eu2+]3[Mg2+]5[Si4–]2[Si38–] and [Eu2+]3[Mg2+]5[Ge4–]2[Ge38–] contain isolated tetrelide ions and bent Si3 (d(Si–Si): 239–241 pm) and Ge3 units (d(Ge–Ge): 251–256 pm) units respectively which have single bond character and are isoelectronic to Cl2O, Cl2S, and [P35–]. The formal chemical bonding is confirmed by ab‐initio calculations. The ecliptic stacking of the anions along b causes a strong dispersion of the dedicated bands. Eu3Mg5Si5 is predicted to be a semi‐metal; i.e., a semi‐conductor with zero energy gap between bands derived from anti‐bonding silicon states. Eu3Mg5Ge5, however, appears to be a metal, due to the participation of germanium‐d orbitals to states at the Fermi level. The divalent europium has been manifested through magnetic susceptibility measurements. At high temperatures, Eu3Mg5Si5 and Eu3Mg5Ge5 are Curie–Weiss paramagnets with experimental magnetic moments of 7.96(1) and 7.94(1) μB/Eu atoms, respectively. Magnetic ordering, hinting at frustrated interactions, is observed at 19.1 (Eu3Mg5Si5) and 14.2 (Eu3Mg5Ge5) K. Temperature dependent 151Eu Mössbauer spectra are indicative of purely divalent europium and complex magnetic hyperfine field splitting at low temperatures.
Synthesis, Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu2–xMg2–yGe3 (x = 0.1; y = 0.5)
Authors: Slabon Adam , Cuervo‐Reyes Eduardo , Kubata Christof , Wörle Michael , Mensing Christian , Nesper Reinhard 
Published: June 2012

AbstractThe new ternary phase Eu2–xMg2–yGe3 (x = 0.1, y = 0.5) was obtained by solid‐state synthesis and the structure determined by means of Single Crystal X‐ray Diffraction. The compound crystallizes with the orthorhombic space group Cmcm (no. 63) having structural features of the low‐temperature modification of LaSi. The crystal structure contains two different types of germanium anions: isolated Ge4– and $\rm^{2}_{\infty}$[Ge2–x–y] chains. The cation substructure is partially disordered and is best represented assuming a split position. The chemical bonding is well represented by the Zintl‐Klemm concept. Resistivity measurements reveal that the compound is metallic. DFT band structure calculations were carried out on the ideal stoichiometric compound Eu2Mg2Ge3, showing that this model (x = 0; y = 0) would be also metallic as a consequence of the ecliptic stacking of anions. Susceptibility and specific heat measurements evidence the presence of weak, and probably frustrated, antiferromagnetic interactions between disordered europium atoms.
Reconstructing Higgs boson properties from the LHC and Tevatron data
Authors: Giardino Pier Paolo , Kannike Kristjan , Raidal Martti , Strumia Alessandro 
Published: June 2012

Abstract

We perform a phenomenological fit to all ATLAS, CMS, CDF and D0 Higgs boson data available after Moriond 2012. We allow all Higgs boson branching fractions, its couplings to standard model particles, as well as to an hypothetical invisible sector to vary freely, and determine their current favourite values. The standard model Higgs boson with a mass 125 GeV correctly predicts the average observed rate and provides an acceptable global fit to data. However, better fits are obtained by non-standard scenarios that reproduce anomalies in the present data (more γγ and less WW signals than expected) such as modified rates of loop processes or partial fermiophobia. We find that present data disfavours Higgs boson invisible decays. We consider implications for the standard model, for supersymmetric and fermiophobic Higgs bosons, for dark matter models, for warped extra-dimensions.