bluuebunny/crossref_metadata_2025_split huggingface dataset:
Atomic‐Level Alloying and De‐alloying in Doped Gold Nanoparticles
Authors: Gottlieb Eric , Qian Huifeng , Jin Rongchao 
Published: February 2013

AbstractAtomically precise alloying and de‐alloying processes for the formation of Ag–Au and Cu–Au nanoparticles of 25‐metal‐atom composition (referred to as AgxAu25−x(SR)18 and CuxAu25−x(SR)18, in which R=CH2CH2Ph) are reported. The identities of the particles were determined by matrix‐assisted laser desorption ionization mass spectroscopy (MALDI‐MS). Their structures were probed by fragmentation analysis in MALDI‐MS and comparison with the icosahedral structure of the homogold Au25(SR)18 nanoparticles (an icosahedral Au13 core protected by a shell of Au12(SR)18). The Cu and Ag atoms were found to preferentially occupy the 13‐atom icosahedral sites, instead of the exterior shell. The number of Ag atoms in AgxAu25−x(SR)18 (x=0–8) was dependent on the molar ratio of AgI/AuIII precursors in the synthesis, whereas the number of Cu atoms in CuxAu25−x(SR)18 (x=0–4) was independent of the molar ratio of CuII/AuIII precursors applied. Interestingly, the CuxAu25−x(SR)18 nanoparticles show a spontaneous de‐alloying process over time, and the initially formed CuxAu25−x(SR)18 nanoparticles were converted to pure Au25(SR)18. This de‐alloying process was not observed in the case of alloyed AgxAu25−x(SR)18 nanoparticles. This contrast can be attributed to the stability difference between CuxAu25−x(SR)18 and AgxAu25−x(SR)18 nanoparticles. These alloyed nanoparticles are promising candidates for applications such as catalysis.
One‐Bit Compressed Sensing by Linear Programming
Authors: Plan Yaniv , Vershynin Roman 
Published: February 2013

AbstractWe give the first computationally tractable and almost optimal solution to the problem of one‐bit compressed sensing, showing how to accurately recover an s‐sparse vector
\input amssym $x \in {\Bbb R}^n$
from the signs of $O(s \log^2(n/s))$
random linear measurements of x. The recovery is achieved by a simple linear program. This result extends to approximately sparse vectors x. Our result is universal in the sense that with high probability, one measurement scheme will successfully recover all sparse vectors simultaneously. The argument is based on solving an equivalent geometric problem on random hyperplane tessellations.
Efficient filter for the generation/correlation of Golay binary sequence pairs
Authors: García Enrique , Ureña Jesús , García Juan J. , Ruiz Daniel , Pérez María C. , García Juan C. 
Published: February 2013

SUMMARYIn this paper, a digital filter for the generation/correlation of binary Golay pairs of sequences of length 2N · 10M · 26P (N, M and P are non‐negative integers) is proposed. It is carried out by means of a novel Golay kernel 26 decomposition, also introduced in this paper, combined with building blocks of Golay kernels 2 and 10, presented in previous works. The proposed filter has a similar architecture to the digital filter for the generation/correlation of Golay multilevel pairs of sequences, where the parameters at intermediate stages have to be adjusted to obtain Golay binary pairs of sequences in the final stage. Copyright © 2013 John Wiley & Sons, Ltd.
High‐resolution 3D numerical modeling of thrust wedges: Influence of décollement strength on transfer zones
Authors: Ruh Jonas B. , Gerya Taras , Burg Jean‐Pierre 
Published: February 2013

AbstractThe mechanics and dynamics of thin‐skinned compressible thrust wedges with prescribed offsets in the backstop, i.e., transfer zones, are investigated using a three‐dimensional finite difference numerical model with a visco‐brittle/plastic rheology. The main questions addressed are as follows: (i) What is the influence of the initial length of the backstop offset and (ii) what is the effect of the frictional strength of the main décollement on the structural evolution of the brittle wedges along such transfer zones? Results show that the shorter the backstop offset, the earlier these two thrust planes connect, forming a curved frontal thrust along the entire width of the model. Younger, in‐sequence thrusts are formed parallel to this curved shape. Long backstop offsets produce strongly curved thrust faults around the indenting corner. Simulations with a weak basal friction evolve toward almost linear frontal thrusts orthogonal to the bulk shortening direction. Increased basal drag in models with a strong décollement favors propagation of the backstop offset into a transfer zone up to the frontal thrust. These simulations revealed that surface tapers of the wedge in front of the backstop promontory are larger than what the critical wedge theory predicts, whereas the tapers on the other side of the transfer zone are smaller than analytical values. This difference is amplified with increasing length of the backstop offset and/or strength of the décollement. Modeled surface elevation schemes reproduce well the topographic patterns of natural orogenic systems such as the topographic low along the Minab‐Zendan transform/transfer fault between the Zagros and Makran.
Light‐Switchable Polymer from Cationic to Zwitterionic Form: Synthesis, Characterization, and Interactions with DNA and Bacterial Cells
Authors: Sobolčiak Patrik , Špírek Mário , Katrlík Jaroslav , Gemeiner Peter , Lacík Igor , Kasák Peter 
Published: February 2013

AbstractA novel cationic polymer poly(N,N‐dimethyl‐N‐[3‐(methacroylamino) propyl]‐N‐[2‐[(2‐nitrophenyl)methoxy]‐2‐oxo‐ethyl]ammonium chloride) is synthesized by free‐radical polymerization of N‐[3‐(dimethylamino)propyl] methacrylamide and subsequent quaternization with o‐nitrobenzyl 2‐chloroacetate. The photolabile o‐nitrobenzyl carboxymethyl pendant moiety is transformed to the zwitterionic carboxybetaine form upon the irradiation at 365 nm. This feature is used to condense and, upon the light irradiation, to release double‐strand DNA tested by gel electrophoresis and surface plasmon resonance experiments as well as to switch the antibacterial activity to non‐toxic character demonstrated for Escherichia coli bacterial cells in solution and at the surface using the self‐assembled monolayers.
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Workplace Innovation in a Nonprofit Organization
Authors: McMurray Adela J. , Islam Md. Mazharul , Sarros James C. , Pirola‐Merlo Andrew 
Published: February 2013

AbstractWe examine the relationships among leadership, organizational climate, and workplace innovation in a nonprofit organization. We used established scales including the Transformational Leadership Scale, Organizational Climate Questionnaire, and Workplace Innovation Scale, and then descriptive statistics, regression models, and regression‐based path analysis to fulfill the objectives of the study. The survey was administered to full‐time and part‐time employees in a religious‐based nonprofit organization in Australia. A major finding is that leadership directly promotes workplace innovation and can foster a healthy climate, while the partial effect of organizational climate on workplace innovation, holding leadership constant, was insignificant. Certain characteristics of transformational leadership, transactional leadership, and organizational climate were predictive of workplace innovation as defined. The benefit of this study resides in its potential to look further into predictive leadership characteristics that would assist with recruitment processes in nonprofit organizations.
Molecular imprinted polymer films on RFID tags: a first step towards disposable packaging sensors
Authors: Croux Dieter , Vangerven Tim , Broeders Jeroen , Boutsen Jan , Peeters Marloes , Duchateau Stijn , Cleij Thomas , Deferme Wim , Wagner Patrick , Thoelen Ronald , De Ceuninck Ward 
Published: February 2013

AbstractMolecular imprinted polymer (MIP) sensors offer a high potential in the development of cheap small‐scale disposable biomimetic sensors. Molecular imprinting leads to the formation of inert polymer particles with nanocavities, which can exhibit similar selectivity and specificity to target molecules as antibodies or enzymes. These sensors open up many possible applications in the field of mass‐market consumer products such as food packaging sensors. One such application is the detection of histamine in spoiled fish, which causes scombroid poisoning, a common seafood poisoning.This contribution provides one possible solution for easing the use of these sensors in field applications. A screen‐printed short‐range wireless MIP‐based biosensor based upon passive radio frequency identification (RFID) tags was developed as a proof of principle. Histamine molecules binding to an MIP recognition layer induce a dielectric change in the sensor capacitance, resulting in a resonance frequency shift that is transmitted by inductive coupling. This wireless sensor is capable of detecting histamine concentrations as low as 50 nM at a range of a few centimeters.
Oxidation behavior and thermal stability of a NiAl–V eutectic alloy
Authors: Milenkovic Srdjan , Caram Rubens 
Published: February 2013

AbstractOxidation behavior and thermal stability of a NiAl–V alloy with eutectic composition processed by directional solidification technique has been investigated. The surface analysis at the elevated temperature indicated that the investigated microstructures are stable at the isothermal conditions and an inert atmosphere. The oxidation testing in the synthetic air showed that the temperature of 400 °C is critical. In addition, the oxidation of the NiAl–V eutectic alloy is characterized by: (a) alteration of composition immediately below the surface substrate/oxide; (b) formation of the oxide layer rich in V, adherent to the substrate; and (c) formation of external oxide layer that presents oxide mixture formed by vanadium, nickel, and aluminum. Microstructure of the substrate/oxide interface of NiAl–V alloy oxidized at 900 °C for 24 h.
Phase development and electrical properties of Pb(Mg1/3Nb2/3)O3‐PbTiO3 ceramics prepared by partial oxalate route
Authors: Qian Kun , Fang Bijun , Du Qingbo , Ding Jianning , Zhao Xiangyong , Luo Haosu 
Published: February 2013

Abstract(1 − x)Pb(Mg1/3Nb2/3)O3‐xPbTiO3 (PMN‐PT, x = 0.2–0.4) ferroelectric (FE) ceramics were prepared by the partial oxalate route. The synthesized PMN‐PT ceramics exhibit high density and densified microstructure although slight content of pyrochlore phase impurity exists. With the increase of PbTiO3 (PT) content, the phase structure of the PMN‐PT ceramics changes gradually from rhombohedral perovskite structure, across the morphotropic phase boundary (MPB) composition and to tetragonal perovskite structure. The FE structural phase transition of PMN‐PT changes gradually from the diffused ferroelectric phase transition (FPT) of typical relaxor FEs to nearly first‐order FPT of normal FEs, confirmed by dielectric and FE properties measurements. The PMN‐PT ceramics exhibit excellent dielectric and piezoelectric properties, and fully developed and saturated P–E hysteresis loops, in which the MPB effects are clearly shown by these electrical properties. The MPB composition of the PMN‐PT system is determined locating at x = 0.31–0.33 by XRD measurement and electrical properties measurements.
Importance of Pd and Pt excited states in N2O capture and activation: A comparative study with Rh and Au atoms
Authors: Poulain Enrique , Rubio‐Ponce Alberto , Uc Victor Hugo , Bertin Virineya , Olvera‐Neria Oscar 
Published: February 2013

AbstractNitrous oxide (N2O) is an intermediate compound formed during catalysis occurring in automobile exhaust pipes. In this work, the N2O capture and activation by Pt and Pd atoms in the ground and excited states of many multiplicities are studied. Pt and Pd + N2O reactions are studied at multireference second‐order perturbation level of theory using Cs symmetry. The PtN2O (1A′, 5A′, and 5A″) species are spontaneously created from excited states. Only the 5A′ and 5A″ states exhibit N2O activation reaction paths when N2O approaches Pt end‐on by the N or O atoms side or side‐on yielding NO or N2 as products, respectively. Pt+ cations ground and excited states, capture N2O, although only Pt+ (6A′ and 6A″) states show N2O activation yielding O and N2 as products. In the Pd atom case, PdN2O (1A′ and 5A″) species are also spontaneously created from excited states. The 5A″ state exhibits N2O activation yielding N2 + O as products. Pd+ cations in both ground and excited states capture N2O; however, only the [PdN2O]+ (4A′, 4A″, 6A′, and 6A″) states in side‐on approaches and (6A′) in end‐on approach activate the N2O and yield the N2 bounded to the metal and O as product. The results obtained in this work are discussed and compared with previous calculations of Rh and Au atoms. The reaction paths show a metal–gas dative covalent bonding character. Löwdin charge population analyses for Pt and Pd active states show a binding done through charge donation and retrodonation between the metals and N2O. © 2013 Wiley Periodicals, Inc.
Assessing the performance of density functional theory for the dynamic polarizabilities of amino acids: Treatment of correlation and role of exact exchange
Authors: Alipour Mojtaba , Mohajeri Afshan 
Published: February 2013

AbstractThe theoretical determination of electric response properties of the biological systems is a field where the application of density functional theory (DFT) appears to be quite promising. In this work, the performance of 41 density functional methods is evaluated in predicting dynamic polarizabilities of an experimental benchmark set of 20 proteinogenic amino acids. The behavior of a large number of density functionals, including various types of the local spin density approximation (LSDA), generalized gradient approximation (GGA), meta‐GGA (m‐GGA), hybrid‐GGA (h‐GGA), hybrid meta‐GGA (hm‐GGA), and range‐separated hybrid‐GGA (rsh‐GGA), has been assessed for the purpose. Analyzing the results of our DFT benchmarking, we found that these computationally economical methods show very diverse predictive capability and a careful selection of DFT functionals is very important in the polarizability calculations. Considering the role of exchange, correlation, dispersion and long‐range corrections, it turned out that in the LSDA class, SVWN3 gives better results than SPL and SVWN5 toward the reference values. Of the GGA methods, OPBE outperforms all other functionals. The M06‐L is the best method of m‐GGA class. The B3LYP and TPSSh are the best functionals of h‐GGA and hm‐GGA lineages, respectively. Finally, CAM‐B3LYP is the best method of rsh‐GGA functionals that predicts the most accurate polarizability for amino acids by a large margin with respect to others. Overall, the best performing functionals turn out to be hm‐GGAs TPSSh, TPSS1KCIS, M05, tau‐HCTHhyb, and h‐GGA B3LYP. Hopefully, the results of this investigation might provide the useful guidance to propose a new exchange‐correlation functional for calculating the optical properties of biomolecular materials. © 2013 Wiley Periodicals, Inc.
Argument on biometrics identity‐based encryption schemes
Authors: Tan Syh‐Yuan , Jin Zhe , Teoh Andrew Beng Jin 
Published: February 2013

ABSTRACTRecently, a few biometric identity‐based encryption (BIO‐IBE) schemes have been proposed. BIO‐IBE leverages both fuzzy extractor and Lagrange polynomial to extract biometric feature as a user public key and as a preventive measure of collusion attack, respectively. In this paper, we reveal that BIO‐IBE is not realistic whereby a query of fresh biometrics is needed for each encryption process. Moreover, the use of both fuzzy extractor and Lagrange polynomial in BIO‐IBE simultaneously is a redundancy; it confers no advantage, but simply computational overhead. Therefore, we amend the progression of the BIO‐IBE scheme by eliminating either Lagrange polynomial or fuzzy extractor to alleviate computational complexity. Subsequently, we demonstrate that the amendment does not compromise the security of the BIO‐IBE scheme. Such amendments can be applied to other BIO‐IBE schemes as well. Copyright © 2013 John Wiley & Sons, Ltd.
Is levator avulsion a predictor of cystocele recurrence following anterior vaginal mesh placement?
Authors: Wong V. , Shek K. , Rane A. , Goh J. , Krause H. , Dietz H. P. 
Published: February 2013

ABSTRACTObjectiveLevator avulsion has been shown to be a predictor of cystocele recurrence following anterior colporrhaphy. The aim of this study was to determine if levator avulsion is a risk factor for prolapse recurrence following anterior colporrhaphy with mesh.MethodsThis was a retrospective analysis of data obtained from three surgical audits for subjective and objective outcomes following anterior colporrhaphy with mesh. Recurrence was defined as cystocele ≥ Stage 2 on the prolapse quantification system of the International Continence Society; symptoms of vaginal lump/bulge; or cystocele on ultrasound, defined as maximum bladder descent to ≥ 10 mm below the symphysis pubis. Levator avulsion was diagnosed using tomographic ultrasound imaging.ResultsTwo hundred and nine patients were followed up at a mean of 2.2 years (range, 3 months to 5.6 years) after anterior vaginal mesh placement. 24% (51/209) had recurrent prolapse symptoms, 33% (68/209) clinical cystocele recurrence ≥ Stage 2, and 26% (54/209) a recurrent cystocele on ultrasound. Twenty‐eight out of 80 (35%) women with levator avulsion had significant sonographic cystocele recurrence (odds ratio (OR), 2.24 (95% confidence interval (CI), 1.13–4.43)). This finding was confirmed after adjusting for potential predictors of prolapse recurrence on multivariate logistic regression (OR, 2.13 (95% CI, 1.04–4.39); P = 0.04).ConclusionLevator avulsion doubles the risk of cystocele recurrence after anterior colporrhaphy with transobturator mesh. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd.
Characterization of a Namban folding screen from the Edo period by means of EDXRF, SEM‐EDS and Raman spectroscopy
Authors: Pessanha S. , LeGac A. , Madeira T. I. , Guilherme A. , Manso M. , Carvalho M. L. 
Published: February 2013

In this work, a multianalytical approach is employed to characterize the materials used in a Namban folding screen that depicts the arrival of the Portuguese to the port of Nagasaki. Portuguese sailors reached Japan in 1543 and initiated what was to be known as the Namban trade. This interaction between Portuguese and Japanese was meticulously recorded by artists in the form of valuable and rare folding screens.The present screen, attributed to the Edo period (~1603–1868), is what we could consider a second‐generation screen, a copy of scenes and characters that appear in screens from the Momoyama period (~1573–1603) but in increased scale and minor detail. The materials used in the screen were identified by means of in situ energy dispersive X‐ray fluorescence. Complementary results were obtained by Raman and scanning electron microscopy coupled to energy dispersive spectrometry analysis of microsamples taken from the screen.The palette used in this artwork resorts to gold, malachite, azurite, vermillion, red lead, white oyster shell, and carbon black. Differences were found, when compared with previously studied screens, i.e. the use of mixtures of pigments, namely vermillion with red lead in an orange shade of red and also the mixture of vermillion and carbon black to obtain a brown color. Special emphasis was given to the characterization of the golden areas and study of techniques of gold application. Copyright © 2013 John Wiley & Sons, Ltd.
Decentralization andhukoureforms in China
Authors: Wu Ling 
Published: February 2013

AbstractChina is undergoing a process of decentralization that has been highly valued for its economic growth. However, this paper aims to explore how this process has affected the equality of social provision for rural–urban migrants in China by taking hukou system reform as a case study. It is argued here that the traditional assumption that decentralization promotes social welfare by bringing the government closer to the people is not necessarily true, or at least not uniformly so in certain institutional settings. Decentralization policies in contemporary China indeed make local governments more powerful and responsible for social welfare provision to their local citizens, but have also undermined the incentives for local governments to cover the welfare costs for migrant workers. To this extent, decentralization has played a negative role in integrating the large number of migrant workers into local cities and promoting equity within social welfare delivery at a national level in China.
Diosmin protects against trichloroethylene-induced renal injury in Wistar rats: plausible role of p53, Bax and caspases
Authors: Rehman Muneeb U. , Tahir Mir , Quaiyoom Khan Abdul , Khan Rehan , Lateef Abdul , Hamiza Oday O. , Ali Farrah , Sultana Sarwat 
Published: February 2013

Diosmin (DM) is a naturally occurring flavone and has been found to possess numerous therapeutic properties. In this study, we used DM as a protective agent against the nephrotoxic effects of the environmental toxicant trichloroethylene (TCE). Male Wistar rats were divided into five groups (I–V,n6). Groups II, III and IV received an oral administration of TCE at a dose of 1000 mg/kg body weight for twenty consecutive days. The animals in groups II and III received an oral treatment of DM at doses of 20 and 40 mg/kg body weight, respectively, for twenty consecutive days, while groups I and V were given maize oil (5 ml/kg body weight and DM 40 mg/kg body weight, respectively) for 20 d. The protective effects of DM on TCE-induced oxidative stress and caspase-dependent apoptosis were investigated by assaying oxidative stress biomarkers, lipid peroxidation (LPO), serum toxicity markers, alkaline unwinding assay, caspase-3, -7 and -9, Bax and p53 expression. Oral administration of TCE in rats enhanced renal LPO, depleted glutathione content and antioxidant enzymes, induced DNA strand breaks (P< 0·001), modulated the expression of Bax and p53 protein and induced the expression of caspase-3, -7 and -9. Co-treatment with DM prevented oxidative stress by restoring the levels of antioxidant enzymes; furthermore, a significant dose-dependent decrease in DNA disintegration and kidney toxicity markers such as blood urea N, creatinine, lactate dehydrogenase and kidney injury molecule-1 was observed. DM also effectively decreased the TCE-induced up-regulation of Bax and p53. Data from the present study establish the protective role of DM against TCE-induced renal damage.