bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bedside ultrasonographic diagnosis of pneumothorax
Authors: Ünlüer Erden Erol , Karagöz Arif 
Published: May 2014

Abstract
Pneumothorax (PTX) is the presence of an excessive amount of air between the two layers of the pleura. The clinical results depend on the extent of lung collapse. Bedside lung ultrasonography (BLUS) is a valuable way to diagnose PTX in the emergency department. The lung point is a pathognomonic sign of PTX. Here, we present a previously healthy 17-year-old male with left shoulder pain for 2 days, who was referred to the emergency department (ED). He had no history of trauma. BLUS was performed by the emergency physician. The lung point was detected with BLUS, and he was diagnosed with primary spontaneous PTX. Needle aspiration was performed. The patient was followed up with BLUS. Evidence of PTX was absent in BLUS after 6 h, and the patient was discharged for follow-up by a respiratory physician. In this case, the lung point in BLUS helped us make an accurate diagnosis of primary spontaneous PTX and invasive management of disease was arranged accordingly.
Green Synthesis of Silver Nanoparticles for Control of Biodeterioration
Authors: Gómez M.A. Martínez , Chávez M.C. González , Hernández J.C. Mendoza , González R. Carrillo 
Published: May 2014

ABSTRACTChemical and biological deterioration of surfaces of historic constructions is one of the main causes of destruction of cultural heritage buildings. Effective techniques are searched in order to control the biofilm development of cultural heritage without damaging the environment. Nanotechnology is an emerging option with several applications, including those for improving stability and corrosion resistance in surfaces. Production of nanomaterials from organic nature or green synthesis offers ecological advantages such as low environmental impact. This paper proposes the use of silver nanoparticles of biological synthesis as an alternative for control of microorganisms that cause biodeterioration. The present study highlights the effect of these nanoparticles in the inhibition of bacterial growth. These particles were produced by biological synthesis with Tecoma stans L. extracts. Their characterization included analysis UV / Vis spectroscopy, scanning electron microscopy (SEM) and particle size distribution.
Synthesis And Properties Of Magnetic Nanoparticles With Tunable Magnetic Anisotropy Energy
Authors: Dupuis Vincent , Gavrilov-Isaac Véronica , Neveu Sophie , Aouadi Merwen , Abramson Sébastien 
Published: May 2014

ABSTRACTIn this paper, we discuss several strategies to tailor magnetic properties related to the magnetic anisotropy energy, such as the blocking temperature or the low temperature coercivity, of magnetic nanoparticles or materials made with magnetic nanoparticles. We describe a first approach that consists in synthesizing and dispersing bi and tri-magnetic core-shell nanoparticles that include a core made of a material with a weak anisotropy energy density and a shell made with a material with a large anisotropy energy density. This approach is a promising route to tune the blocking temperature of low temperature coercivity of a particle without altering its magnetization and with a good control of its size. Additionally, we also explore another route for the control of the shape of the hysteresis loop of material made with magnetic nanoparticles that consists in the simple mixture of magnetically soft and hard magnetic nanoparticles to create binary mixtures. In this case, it is the mixing ratio that allows one to adjust the properties of the final material.
Chemistry at the Dirac Point of Graphene: Diels-Alder Approach to Reversible Band Gap Engineering and High Mobility Graphene Devices
Authors: Sarkar Santanu 
Published: May 2014

ABSTRACTThe Diels-Alder (DA) pericyclic chemistry is one of the most powerful reactions in synthetic chemistry. We have recently shown that the unique zero-band-gap electronic structure of graphene at the Dirac point facilitates the band-gap-dependent DA reaction of graphene, although graphene is the thermochemical reference for carbon. We have shown that in the DA reactions, graphene can function either as a diene or a dienophile (dual nature). Such DA functionalization of graphene when applied to graphene-FET devices allows balanced functionalization (creation of a pair of new sp3 centers or divacancies) at both A and B graphene sublattices, allowing the fabrication of high mobility DA-functionalized single-layer graphene devices (DA-SLG) with acceptable on/off ratio. The chemistry is thermally reversible via retro-DA chemistry, thus allowing reversible engineering of graphene devices.
On the effect of grain boundaries on the electronic and transport properties of graphene
Authors: Elias Watheq , Elliott M. , Matthai C. C. 
Published: May 2014

ABSTRACTIn studying large scale graphene structures it is necessary to consider the grain boundaries between the many single-crystal domains. The disruption of the crystallographic structure has consequences for both the electronic and transport properties. Although there has been much interest in this area in recent years, the size of system makes it difficult for ab initio methods to be applied to large structures and tight-binding models have provided some interesting results [1]. The semi-empirical Extended Hückel Theory (EHT) has advantage of being able to take account of charge reordering and to study very large systems. We have already applied this approach to study electrical transport across organic molecules and carbon nanoribbons. In this paper, we report on the results of EHT self-consistent calculations carried out to investigate the effect of grain boundaries on both the electronic structure and the electrical transport.
Meeting-or-Beating, Earnings Management, and Investor Sensitivity after the Scandals
Authors: Byun Sanghyuk , Roland-Luttecke Kristin 
Published: May 2014

SYNOPSIS
We contribute to the literature investigating the market reaction to firms' small positive earnings surprises following the large accounting scandals in the early 2000s. While prior studies provide evidence that the market no longer rewards firms for meeting-or-beating (MBE) in the post-scandal period, their efforts to address the rationality of the market response invite additional analysis. We demonstrate that the change in the market reaction to MBE is consistent with temporary over-skepticism. Specifically, we show that the market does not differentiate between MBE achieved operationally versus through earnings management, despite previously documented differences in future performance. We explore the relation between MBE, earnings management, and future performance in the post-scandal period and find evidence of mispricing consistent with the market underreacting to small positive earnings surprises earned by firms that do not appear to have manipulated earnings to MBE. Our study provides evidence of a potential market anomaly, which should be of interest to financial managers, researchers, and investors, and speaks to capital market regulation.
Data Availability: Data are available from sources identified in the paper.
Comparison of Five Svd-Based Algorithms for Calibration of Spectrophotometric Analyzers
Authors: Wagner Jakub , Morawski Roman Z. , Miękina Andrzej 
Published: May 2014

Abstract
Spectrophotometry is an analytical technique of increasing importance for the food industry, applied i.a. in the quantitative assessment of the composition of mixtures. Since the absorbance data acquired by means of a spectrophotometer are highly correlated, the problem of calibration of a spectrophotometric analyzer is, as a rule, numerically ill-conditioned, and advanced data-processing methods must be frequently applied to attain an acceptable level of measurement uncertainty. This paper contains a description of four algorithms for calibration of spectrophotometric analyzers, based on the singular value decomposition (SVD) of matrices, as well as the results of their comparison - in terms of measurement uncertainty and computational complexity - with a reference algorithm based on the estimator of ordinary least squares. The comparison is carried out using an extensive collection of semi-synthetic data representative of trinary mixtures of edible oils. The results of that comparison show the superiority of an algorithm of calibration based on the truncated SVD combined with a signal-to-noise ratio used as a criterion for the selection of regularisation parameters - with respect to other SVD-based algorithms of calibration.
Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering
Authors: Lamonaca Francesco , Carrozzini Antonio , Grimaldi Domenico , Olivito Renato Sante 
Published: May 2014

Abstract
Non-invasive damage monitoring of concrete structures by means of Acoustic Emission (AE) requires multitransducers, multi-channel acquisition, high sampling frequency and long observation time. Owing to its propagation in concrete, the signal from AE reduces its amplitude during the propagation, and, consequently, some events can be lost due to lower signal intensity than the trigger level set on one sensor only. The innovative proposal discussed in the paper consists in the introduction of a Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by any transducer. Experimental tests confirm the effectiveness of the FAT to acquire all the AE events and to increase the evaluation accuracy of damage indexes.
Space-Time Estimates of Mild Solutions of a Class of Higher-Order Semilinear Parabolic Equations in Lp
Authors: Sandjo Albert N. , Soh Célestin Wafo 
Published: May 2014

AbstractWe establish the well-posedness of boundary value problems for a family of nonlinear higherorder parabolic equations which comprises some models of epitaxial growth and thin film theory. In order to achieve this result, we provide a unified framework for constructing local mild solutions in C
Influence of human activities on the soils of Debrecen, Hungary
Authors: Sándor Gábor , Szabó György 
Published: May 2014

Abstract
Soil profiles of the city centre of Debrecen were investigated in order to examine their properties and investigate the vertical distribution of heavy metals as a measure the anthropogenic activity. During the laboratory work the basic soil features were identified (texture, artefact content, pH, CaCO3, and amounts of organic matter). Furthermore, contents of Pb, Zn, Cu and Co in the soils were measured. Most of the metals showed a strong positive correlation with the humus content and the silt fraction. The soils of the city centre are exposed to a significant anthropogenic effect, therefore the original soil morphologies are usually difficult to identify. The soil profiles are greatly disturbed, which is traceable in the vertical distribution of certain soil features and metal contents.
Total Synthesis of Jiadifenolide
Authors: Paterson Ian , Xuan Mengyang , Dalby Stephen M. 
Published: May 2014

AbstractAs a potent neurotrophic agent, the sesquiterpenoid jiadifenolide represents a valuable small‐molecule lead for the potential therapeutic treatment of neurodegenerative diseases. A stereocontrolled total synthesis of this densely functionalized natural product is reported, central to which is an adventurous samarium‐mediated cyclization reaction to establish the tricyclic core and the adjacent C5 and C6 quaternary stereocenters.
Interactive model‐based reconstruction of the human head using an RGB‐D sensor
Authors: Zollhöfer Michael , Thies Justus , Colaianni Matteo , Stamminger Marc , Greiner Günther 
Published: May 2014

ABSTRACTWe present a novel method for the interactive markerless reconstruction of human heads using a single commodity RGB‐D sensor. Our entire reconstruction pipeline is implemented on the graphics processing unit and allows to obtain high‐quality reconstructions of the human head using an interactive and intuitive reconstruction paradigm. The core of our method is a fast graphics processing unit‐based nonlinear quasi‐Newton solver that allows us to leverage all information of the RGB‐D stream and fit a statistical head model to the observations at interactive frame rates. By jointly solving for shape, albedo and illumination parameters, we are able to reconstruct high‐quality models including illumination corrected textures. All obtained reconstructions have a common topology and can be directly used as assets for games, films and various virtual reality applications. We show motion retargeting, retexturing and relighting examples. The accuracy of the presented algorithm is evaluated by a comparison against ground truth data. Copyright © 2014 John Wiley & Sons, Ltd.
Synthesis, Photophysical Properties and Incorporation of a Highly Emissive and Environment‐Sensitive Uridine Analogue Based on the Lucifer Chromophore
Authors: Tanpure Arun A. , Srivatsan Seergazhi G. 
Published: May 2014

AbstractThe majority of fluorescent nucleoside analogues used in nucleic acid studies have excitation maxima in the UV region and show very low fluorescence within oligonucleotides (ONs); hence, they cannot be utilised with certain fluorescence methods and for cell‐based analysis. Here, we describe the synthesis, photophysical properties and incorporation of a highly emissive and environment‐sensitive uridine analogue, derived by attaching a Lucifer chromophore (1,8‐naphthalimide core) at the 5‐position of uracil. The emissive nucleoside displays excitation and emission maxima in the visible region and exhibits high quantum yield. Importantly, when incorporated into ON duplexes it retains appreciable fluorescence efficiency and is sensitive to the neighbouring base environment. Notably, the nucleoside signals the presence of purine repeats in ON duplexes with an enhancement in fluorescence intensity, a property rarely displayed by other nucleoside analogues.
Controlled Nanodimensional Supramolecular Self‐Assembly of Tetra‐Alkylated Naphthalene Diimide Derivatives
Authors: Bhosale Sheshanath V. , Ghule Namdev V. , Al Kobaisi Mohammad , Kelson Melissa M. A. , Bhosale Sidhanath V. 
Published: May 2014

AbstractConstruction of thermodynamically stable nanostructures on the nano‐ to millimeter scales through noncovalent bonding plays an important role in material science. The self‐assembly of tetra‐alkylamino core‐substituted naphthalene diimides (cNDIs) with variable alkyl chains (C8H17, C12H25, and C16H33) added on to the core leads to the formation of a variety of controlled morphologies and well‐defined nanostructures. Such structures include nanorods, vesicular, belts, twisted ribbons, and donutlike morphologies (formed in CHCl3/MeOH and CHCl3/hexane mixtures) generated through solvophobic control. UV/Vis absorption and fluorescence spectroscopy demonstrate molecular aggregation in solution. Furthermore, SEM was employed to visualize the supramolecular self‐assembled nanostructures. The growth of these structures is mainly due to packing of hydrophobic alkyl chains and π–π stacking of the cNDI core. The present study paves the way to rational and controlled designs of nanostructures made of optically active dyes (naphthalene diimide); this may open a new avenue towards tuning nanodimensional morphology.
Observation and Photophysical Characterization of Silicon Phthalocyanine J‐Aggregate Dimers in Aqueous Solutions
Authors: Doane Tennyson , Chomas Andrew , Srinivasan Shriya , Burda Clemens 
Published: May 2014

AbstractThe use of macrocyclic molecules for both imaging and photodynamic therapy (PDT) has proven to be a powerful method for assessing and treating diseases, respectively. However, many potential candidates for these applications rely on rigid organic structures which are hydrophobic and thus lead to possible aggregation in aqueous solutions such as blood. Here, we describe the discovery of noncovalent J‐aggregate dimers of the asymmetrically, axially modified silicon phthalocyanine 4 (Pc 4) in aqueous solutions through steady‐state and time‐resolved spectroscopy. Remarkably, the monomer–dimer equilibrium is dictated by water content and pH, with free monomers resulting in favorable solvation conditions even after formation of the dimer complex. This work sheds light on previous observations of Pc 4 behavior in cells during PDT, and can further elucidate the structure–activity relationship of these important molecules.
A General Strategy for Site‐Directed Enzyme Immobilization by Using NiO Nanoparticle Decorated Mesoporous Silica
Authors: Ling Daishun , Gao Liqian , Wang Jianpeng , Shokouhimehr Mohammadreza , Liu Jiahui , Yu Yongsheng , Hackett Michael J. , So Pui‐Kin , Zheng Bo , Yao Zhongping , Xia Jiang , Hyeon Taeghwan 
Published: May 2014

AbstractMesoporous materials have recently gained much attention owing to their large surface area, narrow pore size distribution, and superior pore structure. These materials have been demonstrated as excellent solid supports for immobilization of a variety of proteins and enzymes for their potential applications as biocatalysts in the chemical and pharmaceutical industries. However, the lack of efficient and reproducible methods for immobilization has limited the activity and recyclability of these biocatalysts. Furthermore, the biocatalysts are usually not robust owing to their rapid denaturation in bulk solvents. To solve these problems, we designed a novel hybrid material system, mesoporous silica immobilized with NiO nanoparticles (SBA‐NiO), wherein enzyme immobilization is directed to specific sites on the pore surface of the material. This yielded the biocatalytic species with higher activity than free enzyme in solution. These biocatalytic species are recyclable with minimal loss of activity after several cycles, demonstrating an advantage over free enzymes.
Swelling Kinetics of Microgels Embedded in a Polyacrylamide Hydrogel Matrix
Authors: Huang Na , Guan Ying , Zhu X. X. , Zhang Yongjun 
Published: May 2014

AbstractComposite hydrogels—macroscopic hydrogels with embedded microgel particles—are expected to respond to external stimuli quickly because microgels swell much faster than bulky gels. In this work, the kinetics of the pH‐induced swelling of a composite hydrogel are studied using turbidity measurements. The embedded microgel is a pH‐ and thermosensitive poly(N‐isopropylacrylamide‐co‐acrylic acid) microgel and the hydrogel matrix is polyacrylamide. A rapid pH‐induced swelling of the embedded microgel particles is observed, confirming that composite hydrogels respond faster than ordinary hydrogels. However, compared with the free microgels, the swelling of the embedded microgel is much slower. Diffusion of OH− into the composite hydrogel film is identified as the main reason for the slow swelling of the embedded microgel particles, as the time of the pH‐induced swelling of this film is comparable to that of OH− diffusion into the film. The composition of the hydrogel matrix does not significantly change the characteristic swelling time of the composite hydrogel film. However, the swelling pattern of the film changes with composition of the hydrogel matrix.
Enhancement of the Photovoltaic Performance of CH3NH3PbI3 Perovskite Solar Cells through a Dichlorobenzene‐Functionalized Hole‐Transporting Material
Authors: Lee Jin‐Wook , Park Sungmin , Ko Min Jae , Son Hae Jung , Park Nam‐Gyu 
Published: May 2014

AbstractA dichlorobenzene‐functionalized hole‐transporting material (HTM) is developed for a CH3NH3PbI3‐based perovskite solar cell. Notwithstanding the similarity of the frontier molecular orbital energy levels, optical properties, and hole mobility between the functionalized HTM [a polymer composed of 2′‐butyloctyl‐4,6‐dibromo‐3‐fluorothieno[3,4‐b]thiophene‐2‐carboxylate (TT‐BO), 3′,4′‐dichlorobenzyl‐4,6‐dibromo‐3‐fluorothieno[3,4‐b]thiophene‐2‐carboxylate (TT‐DCB), and 2,6‐bis(trimethyltin)‐4,8‐bis(2‐ethylhexyloxy)benzo[1,2‐b:4,5‐b′]dithiophene (BDT‐EH), denoted PTB‐DCB21] and the nonfunctionalized polymer [a polymer composed of thieno[3,4‐b]thiophene (TT) and benzo[1,2‐b:4,5‐b′]dithiophene (BDT), denoted PTB‐BO], a higher power conversion efficiency for PTB‐DCB21 (8.7 %) than that for PTB‐BO (7.4 %) is achieved because of a higher photocurrent and voltage. The high efficiency is even obtained without including additives, such as lithium bis(trifluoromethanesulfonyl)imide and/or 4‐tert‐butylpyridine, that are commonly used to improve the conductivity of the HTM. Transient photocurrent–voltage studies show that the PTB‐DCB21‐based device exhibits faster electron transport and slower charge recombination; this might be related to better interfacial contact through intermolecular chemical interactions between the perovskite and the 3,4‐dichlorobenzyl group in PTB‐DCB21.
Effect of Protic Ionic Liquid and Surfactant Structure on Partitioning of Polyoxyethylene Non‐ionic Surfactants
Authors: Topolnicki Inga L. , FitzGerald Paul A. , Atkin Rob , Warr Gregory G. 
Published: May 2014

AbstractThe partitioning constants and Gibbs free energies of transfer of poly(oxyethylene) n‐alkyl ethers between dodecane and the protic ionic liquids (ILs) ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) are determined. EAN and PAN have a sponge‐like nanostructure that consists of interpenetrating charged and apolar domains. This study reveals that the ILs solvate the hydrophobic and hydrophilic parts of the amphiphiles differently. The ethoxy groups are dissolved in the polar region of both ILs by means of hydrogen bonds. The environment is remarkably water‐like and, as in water, the solubility of the ethoxy groups in EAN decreases on warming, which underscores the critical role of the IL hydrogen‐bond network for solubility. In contrast, amphiphile alkyl chains are not preferentially solvated by the charged or uncharged regions of the ILs. Rather, they experience an average IL composition and, as a result, partitioning from dodecane into the IL increases as the cation alkyl chain is lengthened from ethyl to propyl, because the IL apolar volume fraction increases. Together, these results show that surfactant dissolution in ILs is related to structural compatibility between the head or tail group and the IL nanostructure. Thus, these partitioning studies reveal parameters for the effective molecular design of surfactants in ILs.
Cohesive‐Energy‐Resolved Bandgap of Nanoscale Graphene Derivatives
Authors: Wen Zi , Luo Jinsong , Zhu Yongfu , Jiang Qing 
Published: May 2014

AbstractWith a size‐dependent cohesive energy formula for two‐dimensional coordinated materials, the bandgap variation in quantum dots and nanoribbons of graphene derivatives, such as graphane, fluorographene and graphene oxides, is investigated. The bandgap is found to increase substantially as the diameter or width of the nano‐sized material decreases. The bandgap variation is attributed to the change in cohesive energy of edge carbon atoms, and is associated with the physicochemical nature and degree of edge saturation. These predictions agree with previously reported computer simulation results, and have potential application in wide‐band optics and optoelectronics.