bluuebunny/crossref_metadata_2025_split huggingface dataset:
A participação das famílias como uma política educativa
Authors: Albuquerque Simone Santos de 
Published: November 2014

http://dx.doi.org/10.5902/198464449309O artigo apresenta parte da pesquisa intitulada “Das lógicas familiares às lógicas escolares: caminhos e perspectivas na educação das crianças”. O estudo com uma abordagem qualitativa de cunho etnográfico partiu do princípio do pesquisador estar inserido no campo social da investigação. Nesta perspectiva, procurou estabelecer um espaço de diálogo entre a escola e as famílias, provocando uma “escuta” atenta, bem como uma possibilidade de problematizar a pluralidade das lógicas e culturas das famílias e aprofundar o conhecimento sobre suas relações no contexto educativo. A pesquisa apontou para a necessidade de compreender as estratégias de relacionamentos construídas pela escola, destacando como o confronto (THIN, 1998) entre as lógicas familiares e escolares possibilita a construção de estratégias de relacionamentos que qualifiquem a escola como lugar de acolhimento e educação das crianças. Palavras- chave: Educação, Lógicas Familiares, Lógicas Escolares
Low‐Temperature N2 Binding to Two‐Coordinate L2Fe0 Enables Reductive Trapping of L2FeN2− and NH3 Generation
Authors: Ung Gaël , Peters Jonas C. 
Published: November 2014

AbstractThe two‐coordinate [(CAAC)2Fe] complex [CAAC=cyclic (alkyl)(amino)carbene] binds dinitrogen at low temperature (T<−80 °C). The resulting putative three‐coordinate N2 complex, [(CAAC)2Fe(N2)], was trapped by one‐electron reduction to its corresponding anion [(CAAC)2FeN2]− at low temperature. This complex was structurally characterized and features an activated dinitrogen unit which can be silylated at the β‐nitrogen atom. The redox‐linked complexes [(CAAC)2FeI][BArF4], [(CAAC)2Fe0], and [(CAAC)2Fe−IN2]− were all found to be active for the reduction of dinitrogen to ammonia upon treatment with KC8 and HBArF4⋅2 Et2O at −95 °C [up to (3.4±1.0) equivalents of ammonia per Fe center]. The N2 reduction activity is highly temperature dependent, with significant N2 reduction to NH3 only occurring below −78 °C. This reactivity profile tracks with the low temperatures needed for N2 binding and an otherwise unavailable electron‐transfer step to generate reactive [(CAAC)2FeN2]−.
Threading Chalcogenide Layers with Polymer Chains
Authors: Xiong Wei‐Wei , Miao Jianwei , Ye Kaiqi , Wang Yue , Liu Bin , Zhang Qichun 
Published: November 2014

AbstractInserting polymers into a crystalline inorganic matrix to understand the structure, position, and the structure–property relationships of the resulting composites is important for designing new inorganic‐organic materials and tuning their properties. Single crystals of polymer‐chalcogenide composites were successfully prepared by trapping polyethyleneglycol within a selenidostannate matrix under surfactant‐thermal conditions. This work might provide a new strategy for preparing novel crystalline polymer‐inorganic composites through encapsulating polymer chains within inorganic matrices.
Natural history of chronic myelomonocytic leukemia: gene sequencing identifies multiple clonal molecular abnormalities associated with rapid progression to acute myeloid leukemia
Authors: Xiang Zhifu , Kaur Varinder , Aburiziq Ibrahim K. , Mehta Paulette , Emanuel Peter , Schichman Steven A. 
Published: November 2014

Key Clinical MessageGene panel sequencing in a CMML patient without any detectable genetic abnormality by conventional genetic studies identified four concurrent somatic mutations in three genes. Gene panel mutation analysis is a rapidly emerging clinical tool to demonstrate the clonality in hematologic malignancies, and to identify the potential targets for therapy.
Hydrodynamic‐Analogy‐Based Modeling Approach for Distillative Separation of Organic Systems with Elevated Viscosity
Authors: Wolf Tim S. , Bradtmöller Christian , Scholl Stephan , Kenig Eugeny Y. 
Published: November 2014

AbstractA modeling approach based on hydrodynamic analogies is applied to predict the influence of elevated viscosity on the separation efficiency of distillation processes in structured packed columns. An advantage of this approach compared to traditional models based on the film theory is that separation columns can be described without empirical mass transfer coefficient correlations. The separation efficiency was evaluated for two systems with distinct viscosities at different gas and liquid loads and various operating pressures. Simulated concentration profiles and height of a theoretical plate (HETP) values were compared with the data obtained from own experiments. The developed model is capable of correctly predicting the differences in the HETP values of the two evaluated systems.
Bending Nanofibers into Nanospirals: Coordination Chemistry as a Tool for Shaping Hydrophobic Assemblies
Authors: Kossoy Elizaveta , Weissman Haim , Rybtchinski Boris 
Published: November 2014

AbstractIn the current work, we demonstrate how coordination chemistry can be employed to direct self‐assembly based on strong hydrophobic interactions. To investigate the influence of coordination sphere geometry on aqueous self‐assembly, we synthesized complexes of the amphiphilic perylene diimide terpyridine ligand with the first‐row transition‐metal centers (zinc, cobalt, and nickel). In aqueous medium, aggregation of these complexes is induced by hydrophobic interactions between the ligands. However, the final shapes of the resulting assemblies depend on the preferred geometry of the coordination spheres typical for the particular metal center. The self‐assembly process was characterized by UV/Vis spectroscopy, zeta potential measurements, and cryogenic transmission electron microscopy (cryo‐TEM). Coordination of zinc(II) and cobalt(II) leads to the formation of unique nanospiral assemblies, whereas complexation of nickel(II) leads to the formation of straight nanofibers. Notably, coordination bonds are utilized not as connectors between elementary building blocks, but as directing interactions, enabling control over supramolecular geometry.
ChemInform Abstract: Syntheses, Structures, Optical Properties, and Electronic Structures of KBaMSe3 (M: As, Sb).
Authors: Yin Wenlong , Feng Kai , Kang Lei , Kang Bin , Deng Jianguo , Lin Zheshuai , Yao Jiyong , Wu Yicheng 
Published: November 2014

AbstractKBaAsSe3 (I) is prepared by solid state reaction of KAsSe2 and BaSe in a molar ratio of 1:3 (evacuated silica tube, 1273 K, 2 d, controlled cooling).
ChemInform Abstract: Iron(II)‐Catalyzed Intramolecular Olefin Aminofluorination.
Authors: Lu Deng‐Fu , Liu Guan‐Sai , Zhu Cheng‐Liang , Yuan Bo , Xu Hao 
Published: November 2014

AbstractA novel Fe(II)‐catalyzed diastereoselective olefin aminofluorination to transform allylic alcohol derivatives to side chain fluorinated oxazolidinones is developed.
ChemInform Abstract: Alkene‐Assisted Nickel‐Catalyzed Regioselective 1,4‐Addition of Organoboronic Acid to Dienones: A Direct Route to All‐Carbon Quaternary Centers.
Authors: Hong Ya‐Chun , Gandeepan Parthasarathy , Mannathan Subramaniyan , Lee Wei‐Tse , Cheng Chien‐Hong 
Published: November 2014

AbstractA nickel‐catalyzed, highly regioselective conjugate addition of boronic acids to dienones to form 1,4‐addition products with an all‐carbon quaternary center is described.
ChemInform Abstract: Palladium‐Catalyzed Double Activation and Arylation of 2° and 3° C(sp3)—H Bonds of the Norbornane System: Formation of a C—C Bond at the Bridgehead Carbon and Bridgehead Quaternary Stereocenter.
Authors: Parella Ramarao , Babu Srinivasarao Arulananda 
Published: November 2014

AbstractAll reactions proceed diastereoselectively.
ChemInform Abstract: Highly Efficient and Generalized Asymmetric Synthesis of Quaternary Stereogenic Carbon‐Containing β‐Amino Indanones/Indanoles via Mannich‐Type Additions Between 1‐Indanones and N‐tert‐Butanesulfinylketimines.
Authors: Wu Lingmin , Xie Chen , Mei Haibo , Soloshonok Vadim A. , Han Jianlin , Pan Yi 
Published: November 2014

AbstractCompound (IIIa) can be further transformed to the corresponding β‐amino alcohol by stereoselective reduction of its ketone moiety.
ChemInform Abstract: Reaction of Corey Ylide with α,β‐Unsaturated Ketones: Tuning of Chemoselectivity Toward Dihydrofuran Synthesis.
Authors: Chagarovsky Alexey O. , Budynina Ekaterina M. , Ivanova Olga A. , Villemson Elena V. , Rybakov Victor B. , Trushkov Igor V. , Melnikov Mikhail Ya. 
Published: November 2014

AbstractThe chemoselective synthesis of 2,3‐dihydrofurans via Corey‐Chaykovsky reaction is studied.
ChemInform Abstract: Facile Synthesis of 3‐Aryloxindoles via Broensted Acid Catalyzed Friedel—Crafts Alkylation of Electron‐Rich Arenes with 3‐Diazooxindoles.
Authors: Zhai Changwei , Xing Dong , Jing Changcheng , Zhou Jun , Wang Chengjin , Wang Dongwei , Hu Wenhao 
Published: November 2014

AbstractThe 3‐Aryloxindoles are obtained with high regioselectivities under mild and metal‐free reaction conditions.
ChemInform Abstract: N‐Heterocyclic Carbene Catalyzed Intramolecular Acylation of Allylic Electrophiles.
Authors: Zhao Ming , Yang Hui , Li Miao‐Miao , Chen Jie , Zhou Ling 
Published: November 2014

AbstractThe first N‐heterocyclic carbene‐catalyzed intramolecular SN2′ substitution reaction of an aldehyde with allylic electrophiles, followed by isomerization to give α,β‐unsaturated chromanones and related compounds is developed.
ChemInform Abstract: Enantioselective Organocatalytic Partial Transfer Hydrogenation of Lactone‐Fused Quinolines.
Authors: Aillerie Alexandre , Lemau de Talance Vincent , Moncomble Aurelien , Bousquet Till , Pelinski Lydie 
Published: November 2014

AbstractA first organocatalytic transfer hydrogenation of lactone‐fused quinolines to synthesize a range of aza‐podophyllotoxin derivatives (II) is developed.
ChemInform Abstract: Graphite Catalyzed Solvent Free Synthesis of Dihydropyrimidin‐2(1H)‐ones/thiones and Their Antidiabetic Activity.
Authors: Dhumaskar Kashinath L. , Meena Surya Nandan , Ghadi Sanjeev C. , Tilve Santosh G. 
Published: November 2014

AbstractThe title compounds (IV) are obtained by a solvent‐free three‐component condensation reaction between various aromatic aldehydes, ethyl acetoacetate, and urea/thiourea.
ChemInform Abstract: Alkylations and Hydroxymethylations of Pyrazines via Green Minisci‐Type Reactions.
Authors: Bohman Bjorn , Berntsson Benjamin , Dixon Ruby C. M. , Stewart Craig D. , Barrow Russell A. 
Published: November 2014

AbstractA new general access to (hydroxymethyl)trialkylpyrazines utilizing Minisci‐type chemistry is developed.
ChemInform Abstract: A New Convenient Synthetic Method and Preliminary Pharmacological Characterization of Triazinediones as Prokineticin Receptor Antagonists.
Authors: Congiu Cenzo , Onnis Valentina , Deplano Alessandro , Salvadori Severo , Marconi Veronica , Maftei Daniela , Negri Lucia , Lattanzi Roberta , Balboni Gianfranco 
Published: November 2014

AbstractA new improved synthetic methodology to form triazinediones as potential antagonists for prokineticin receptors is described.
ChemInform Abstract: Suffrutines A and B: A Pair of Z/E Isomeric Indolizidine Alkaloids from the Roots of Flueggea suffruticosa.
Authors: Wu Zhen‐Long , Zhao Bing‐Xin , Huang Xiao‐Jun , Tang Gen‐Yun , Shi Lei , Jiang Ren‐Wang , Liu Xin , Wang Ying , Ye Wen‐Cai 
Published: November 2014

AbstractPhotoisomerization of the two isomers induced by visible light is described.
On the acceleration‐based adaptive inverse control of shaking tables
Authors: Dertimanis Vasilis K. , Mouzakis Harris P. , Psycharis Ioannis N. 
Published: November 2014

SummaryAccurate reproduction of time series with diverse frequency characteristics is a central issue in structural testing. This is true not only for simple experimental tests performed by reaction walls or shaking tables but also for more sophisticated ones, such as hybrid testing. Especially in the latter case, where actual feedback from an ongoing test is used in the calculation of the next excitation value, any possible mismatch may be fatal for both the validity of the test and the safety. The objective of this study is to propose a framework for the adaptive inverse control of shaking tables, which succeeds in this matching to a certain degree. By formulating a critical set of design specifications that correspond to safety, implementation, robustness and ease of use, the conducted research results in a design that is based on a modified version of the filtered‐X algorithm with very competitive features. These are the following: (i) default operation in hard real‐time and acceleration mode; (ii) very low hardware requirements; (iii) effective cancelation of the shaking table's dynamics; and (iv) robustness against specimen dynamics. For its practical evaluation, the method is applied to shaking table waveform replication tests under the installation of an approximately linear specimen of sufficiently high mass and complex geometry. The results are promising and suggest further research toward this field, especially in conjunction with hybrid testing, as the method retains certain global applicability attributes and it can be easily extended to other transfer systems, apart from shaking tables. Copyright © 2014 John Wiley & Sons, Ltd.
Endoscopic ultrasound‐guided gallbladder drainage for the management of acute cholecystitis (with video)
Authors: Peñas‐Herrero Irene , de la Serna‐Higuera Carlos , Perez‐Miranda Manuel 
Published: November 2014

AbstractEndoscopic ultrasound‐guided gallbladder drainage (EUS‐GBD) has been introduced as an alternative to percutaneous transhepatic gallbladder drainage for the treatment of acute cholecystitis in non‐surgical candidates. A systematic review of the English language literature through PubMed search until June 2014 was conducted. One hundred and fifty‐five patients with acute cholecystitis treated with EUS‐GBD in eight studies and 12 case reports, and two patients with EUS‐GBD for other causes were identified. Overall, technical success was obtained in 153 patients (97.45%) and clinical success in 150 (99.34%) patients with acute cholecystitis. Adverse events developed in less than 8% of patients, all of them managed conservatively. EUS‐GBD has been performed with plastic stents, nasobiliary drainage tubes, standard or modified tubular self‐expandable metal stents (SEMS) and lumen‐apposing metal stents (LAMS) by different authors with apparently similar outcomes. No comparison studies between stent types for EUS‐GBD have been reported. EUS‐GBD is a promising novel alternative intervention for the treatment of acute cholecystitis in high surgical risk patients. Feasibility, safety and efficacy in published studies from expert centers are very high compared to currently available alternatives. Further studies are needed to establish the safety and long‐term outcomes of this procedure in other practice settings before EUS‐GBD can be widely disseminated.
Removal of cerebrospinal fluid partial volume effects in quantitative magnetization transfer imaging using a three‐pool model with nonexchanging water component
Authors: Mossahebi Pouria , Alexander Andrew L. , Field Aaron S. , Samsonov Alexey A. 
Published: November 2014

PurposeParameters of the two‐pool model describing magnetization transfer (MT) in macromolecule‐rich tissues may be significantly biased in partial volume (PV) voxels containing cerebrospinal fluid (CSF). The purpose of this study was to develop a quantitative MT (qMT) method that provides indices insensitive to CSF PV averaging.Theory and MethodsWe propose a three‐pool MT model, in which PV macro‐compartment is modeled as an additional nonexchanging water pool. We demonstrate the feasibility of model parameter estimation from several MT‐weighted spoiled gradient echo datasets. We validated the three‐pool model in numerical, phantom, and in vivo studies.ResultsPV averaging with the free water compartment reduces all qMT parameters, most significantly affecting macromolecular proton fraction (MPF) and cross‐relaxation rate. Monte‐Carlo simulations confirmed stability of the three‐pool model fit. Unlike the standard two‐pool model, the three‐pool model qMT parameters were not affected by PV averaging in simulations and phantom studies. The three‐pool model fit allowed CSF PV correction in brain PV voxels and resulted in good correlation with standard two‐pool model parameters in non‐PV voxels.ConclusionQuantitative MT imaging based on a three‐pool model with a non‐exchanging water component yields a set of CSF‐insensitive qMT parameters, which may improve MPF‐based assessment of myelination in structures strongly affected by CSF PV averaging such as brain gray matter. Magn Reson Med 74:1317–1326, 2015. © 2014 Wiley Periodicals, Inc.
Parallel‐plate waveguide for volume radio frequency transmission in MRI
Authors: Lu Hai , Shang Shuo , Wang Shumin 
Published: November 2014

PurposeRadiofrequency coils in MRI are narrowband resonant structures. The high‐quality factor makes their performance sensitive to loading and other operating conditions. We developed a new coil to provide volume transmit in a broad frequency band.MethodsThe proposed coil is a parallel‐plate waveguide. When operating in the transverse electromagnetic mode, a uniform magnetic field is generated between the plates for imaging. The impedance of the transverse electromagnetic mode is matched by a broadband matching circuit. The two plates are actively driven with broadband Wilkinson power dividers and combiners. Re‐entrant design is further applied to improve the overall efficiency.ResultsWe developed a prototype of a coil to image the human forearm with a bandwidth of more than one octave. Its feasibility was demonstrated by proton imaging and phosphorous spectroscopy at 7T.ConclusionsThe proposed coil structure is compact and relatively easier to construct. It can be applied for volume radiofrequency transmit in MRI in a broad frequency band. Magn Reson Med 74:1482–1491, 2015. © 2014 Wiley Periodicals, Inc.
Weaknesses of fingerprint‐based mutual authentication protocol
Authors: Picazo‐Sanchez Pablo , Ortiz‐Martin Lara , Peris‐Lopez Pedro , Bagheri Nasour 
Published: November 2014

AbstractThe Internet of Things is an emerging paradigm, which is used to link physical objects with Internet. One of the most common ways of communicating and identifying objects on Internet of Things is using Radio Frequency IDentification (RFID) systems between different objects. Researchers have focused on developing improvements of RFID authentication protocols that stave off privacy threats and well‐known security problems. Recently, Khor et al. have proposed a new authentication protocol that conforms to the Electronic Product Code Class‐1 Generation‐2 standard (ISO/IEC 18000‐6C for RFID systems). In this paper, we show the vulnerabilities of this authentication protocol concerning to full disclosure, impersonation, traceability, de‐synchronization, and Denial‐of‐Service attacks. These attacks make the protocol unfeasible to introduce it with an adequate security and sufficient privacy protection level. Finally, we present a new protocol, called Fingerprint+ protocol, which is based on ISO/IEC 9798‐2 and ISO/IEC 18000‐6C and whose security is formally verified using BAN logic. Copyright © 2014 John Wiley & Sons, Ltd.
Performance of a Non Linear Dynamic Vibration Absorbers
Authors: Djemal F. , Chaari F. , Dion J.-L. , Renaud F. , Tawfiq I. , Haddar M. 
Published: November 2014

AbstractThe most common method of vibration control is the use of the dynamic absorbers. Two types of absorbers can be found: Linear and nonlinear. The use of linear absorbers allows reducing vibration but only at the resonance frequency, whereas nonlinear absorbers attenuate vibration on a wide band of frequency. In this paper, a nonlinear two degrees of freedom (DOF) model is developed. A cubic nonlinearity induced by a gap is considered. The objective of the paper is to characterize nonlinear vibration of the system by applying explicit formulation (EF). An experimental study is performed to validate the numerical results. The jump phenomenon is the principal nonlinear dynamic phenomenon observed on both numerical and experimental investigations.
Recent variations in the terminus position, ice velocity and surface elevation of Langhovde Glacier, East Antarctica
Authors: Fukuda Takehiro , Sugiyama Shin , Sawagaki Takanobu , Nakamura Kazuki 
Published: November 2014

AbstractTo improve the understanding of the mechanism driving recent changes in outlet glaciers in East Antarctica, we measured changes in the terminus position, ice flow velocity and surface elevation of the Langhovde Glacier located on the Sôya Coast. From satellite images from 2000–12 and field measurements taken in 2012 the glacier terminus position and flow velocity showed little change between 2003 and 2007. After this quiescent period, the glacier progressively advanced by 380 m and the flow velocity increased near the calving front by 10 m a-1 from 2007–10. No significant change was observed in surface elevation during the study period. The changes in the terminus position and flow velocity imply a reduction in the calving rate from 93 m a-1 (2003–07) to 16 m a-1 (2007–10). This suggests that calving was inhibited by stable sea ice conditions in the ocean. Theses results indicate that the Langhovde Glacier was in a relatively stable condition during the study period, and its terminus position was controlled by the rate of calving under the influence of sea ice conditions.
Ice shelf history determined from deformation styles in surface debris
Authors: Glasser Neil F. , Holt Tom , Fleming Ed , Stevenson Carl 
Published: November 2014

AbstractThis paper presents InSAR-derived ice shelf velocities and observations of surface debris deformation on the McMurdo Ice Shelf (MIS). Ice shelf velocities show that the MIS has a low surface velocity, with debris-laden parts of the ice shelf in the area known as the ‘swirls’ averaging speeds of c. 3 m a-1 increasing to c. 16 m a-1 at the ice front. Analysis of the fold patterns within moraine ridges on the ice surface reveals a deformational history inconsistent with the present velocity measurements. Polyphase, isoclinal folding within moraine ridges at the surface are interpreted to have formed through intense deformation by past ice flow in a NNW orientation. The velocities and styles of deformation indicate that the majority of debris on the ice shelf was originally transported into the area by a large and dynamic ice sheet/ice shelf system entirely different to that of the present configuration. Although the age of this event is unknown, it is possible that this debris has been exposed on the surface of the ice shelf since the last glacial maximum.