bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sparse scatterers imaging through approximated multitask compressive sensing strategies
Authors: Viani Federico , Poli Lorenzo , Oliveri Giacomo , Robol Fabrizio , Massa Andrea 
Published: April 2013

AbstractIn the framework of the multitask Bayesian compressive sensing (BCS) paradigm, two innovative approaches for the solution of coherent imaging problems are proposed within the first‐order Born approximation and the Rytov approximation.Selected numerical results are reported to compare the proposed techniques with state‐of‐the‐art BCS approaches as well as global optimization‐based methods. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1553–1558, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27612
Miniaturization and isolation improvement of a multiple‐patch antenna system using electromagnetic bandgap structures
Authors: Suntives Asanee , Abhari Ramesh 
Published: April 2013

AbstractIn this article, a compact multielement antenna system composing of microstrip patch antennas is designed by using electromagnetic bandgap (EBG) structures. Two distinct EBG structures are designed to achieve the two objectives of miniaturization and suppression of interelement coupling due to surface waves in a multiantenna system. By embedding an EBG array operating in the slow‐wave region, the area of the microstrip patch antenna is reduced by 67.48%. To alleviate the resulting increased back radiation, a second EBG structure is designed to surround the miniaturized patch antenna and close to 8 dB improvement in the front‐to‐back lobe ratio is achieved. As well, the second EBG design is included in a 2 × 2 multiantenna system to suppress interelement coupling. It is found that the coupling is reduced significantly when utilizing the proposed EBG rings. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1609–1612, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27621
A dual‐band wide‐angle polarization‐insensitive ultrathin gigahertz metamaterial absorber
Authors: Zhai Huiqing , Li Zhenhua , Li Long , Liang Changhong 
Published: April 2013

AbstractIn this research, a dual‐band ultrathin metamaterial absorber with wide‐angle and polarization‐insensitive characteristic is presented. The metamaterial absorbers consist of a periodic arrangement of two scales of Jerusalem resonators and a metallic background plane, separated by only 0.8 mm dielectric spacer. By changing the direction of polarization, we achieve that the structure is polarization insensitive. Simulations demonstrate two good absorption rates in the designed frequency bands over wide angles of incident waves for both transverse electric and magnetic polarizations. Waveguide experiments are conducted to verify that the proposed designs can achieve two good absorptivity peaks. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1606–1609, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27622
Experimental research of surface plasmon polaritons waveguide filter in microwave band
Authors: Wang Wusong , Zhang Liwei , Jia Ran , Zhang Yewen 
Published: April 2013

AbstractBased on theoretical analysis and experiments, the low‐pass filter effects of the μ‐negative materials/double positive materials/μ‐negative materials (MNG‐DPS‐MNG) surface plasmon polaritons waveguide are studied by using L‐C loaded transmission line structures in microwave band. It is shown that the pass‐band width of the waveguide is not determined by its size but the effective permeability in MNG materials. So it can be used to realize the small size and tunable low‐pass filter. The experimental results are in good agreement with results of simulations. These properties will have potential application values in the miniature and tunable low‐pass filters. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1531–1533, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27627
A four‐channel parallel 40 Gb/s laser diode voltage driver in 0.18‐μm CMOS
Authors: Yingmei Chen , Dawei Zai , Li Zhang , Wei Li 
Published: April 2013

AbstractThis article describes the design of a four‐channel parallel 40 Gb/s laser diode voltage driver (LDVD) circuit using 0.18‐μm CMOS technology.The LDVD circuit consists of input buffer stage, preamplifier stage, and output driver stage. The LDVD uses dual power supplies, including the 1.8‐V supply in the preamplifier stage and the 3.5‐V supply in the output driver stage. To increase the bandwidth, the preamplifier stage is made up of two‐stage cascaded differential amplifiers. The output driver circuit uses the RC negative feedback and capacitively coupled current amplifier (C3A) structure to speed up the operation of laser diode. The isolation has been carefully taken to avoid the cross‐talk issues among channels. Experimental results show that each channel of the LDVD can work at 10 Gb/s rate, and the output current swing is over 10 mA. The total power dissipation is 450 mW, and the chip area is 460 × 1230 μm2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1540–1543, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27635
A compact two‐way equal power divider with enhanced out‐of‐band rejection based on SIW technology
Authors: Chen Shiyong , Su Chengfei , Yu Yantao , Wu Yucheng 
Published: April 2013

AbstractA compact two‐way equal power divider with improved out‐of‐band rejection based on substrate‐integrated waveguide technology is presented in this letter.The proposed power divider with 4.3‐GHz center frequency and 38% fractional bandwidth has been designed, fabricated, and measured. The measured results show that the insertion losses are about 3.7 ± 0.5 dB, and the input return loss is greater than 10.6 dB in the pass band, which are in good agreement with the simulated data. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1638–1640, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27641
Novel bandpass‐response power divider with high frequency selectivity using centrally stub‐lOaded resonators
Authors: Song Kaijun , Hu Shunyong , Mo Yuxia , Fan Yong , Zhong Cuilin 
Published: April 2013

AbstractThis article presents a novel bandpass‐response power divider with high frequency selectivity. The centrally stub‐loaded resonators are applied to this power divider in order to provide bandpass‐filtering frequency response. In addition, the presented power divider has three transmission zeros, which can be used to improve the frequency selectivity. The measured results demonstrate the good performance of the fabricated bandpass‐response power divider with high selectivity. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1560–1562, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27644
Schwann cells seeded in acellular nerve grafts improve functional recovery
Authors: Jesuraj Nithya J. , Santosa Katherine B. , Macewan Matthew R. , Moore Amy M. , Kasukurthi Rahul , Ray Wilson Z. , Flagg Eric R. , Hunter Daniel A. , Borschel Gregory H. , Johnson Philip J. , Mackinnon Susan E. , Sakiyama‐Elbert Shelly E. 
Published: April 2013

ABSTRACTIntroduction: This study evaluated whether Schwann cells (SCs) from different nerve sources transplanted into cold‐preserved acellular nerve grafts (CP‐ANGs) would improve functional regeneration compared with nerve isografts. Methods: SCs isolated and expanded from motor and sensory branches of rat femoral and sciatic nerves were seeded into 14mm CP‐ANGs. Growth factor expression, axonal regeneration, and functional recovery were evaluated in a 14‐mm rat sciatic injury model and compared with isografts. Results: At 14 days, motor or sensory‐derived SCs increased expression of growth factors in CP‐ANGs versus isografts. After 42 days, histomorphometric analysis found CP‐ANGs with SCs and isografts had similar numbers of regenerating nerve fibers. At 84 days, muscle force generation was similar for CP‐ANGs with SCs and isografts. SC source did not affect nerve fiber counts or muscle force generation. Conclusions: SCs transplanted into CP‐ANGs increase functional regeneration to isograft levels; however SC nerve source did not have an effect. Muscle Nerve 49: 267–276, 2014
Functional implications of impaired control of submaximal hip flexion following stroke
Authors: Hyngstrom Allison S. , Kuhnen Henry R. , Kirking Kiersten M. , Hunter Sandra K. 
Published: April 2013

ABSTRACTIntroduction: We quantified submaximal torque regulation during low to moderate intensity isometric hip flexion contractions in individuals with stroke and the associations with leg function. Methods: Ten participants with chronic stroke and 10 controls performed isometric hip flexion contractions at 5%, 10%, 15%, 20%, and 40% of maximal voluntary contraction (MVC) in paretic, nonparetic, and control legs. Results: Participants with stroke had larger torque fluctuations (coefficient of variation, CV), for both the paretic and nonparetic legs, than controls (P < 0.05) with the largest CV at 5% MVC in the paretic leg (P < 0.05). The paretic CV correlated with walking speed (r2 = 0.54) and Berg Balance Score (r2 = 0.40). At 5% MVC, there were larger torque fluctuations in the contralateral leg during paretic contractions compared with the control leg. Conclusions: Impaired low‐force regulation of paretic leg hip flexion can be functionally relevant and related to control versus strength deficits poststroke. Muscle Nerve 49: 225–232, 2014
Finite element implementation of a macromolecular viscoplastic polymer model
Authors: Kweon S. , Benzerga A. A. 
Published: April 2013

SUMMARYThis paper presents a time‐integration method for a viscoplastic physics‐based polymer model at finite strains. The macromolecular character of the model resides in (i) the viscoplastic law based on a double‐kink molecular mechanism, and (ii) a full chain network model inspired by rubber elasticity to describe the large‐strain orientation hardening. A back stress enters the constitutive model formulation. Essential aspects of a three‐dimensional finite‐element implementation are outlined, the main novelty being in the back stress formulation. The computational efficiency and accuracy of the algorithm are examined in a series of parameter studies. In addition, because a co‐rotational formulation of the constitutive equations is employed using the Jaumann rate in the hypoelastic equation and the back stress evolution equation a detailed analysis of stress oscillations is carried out up to very large strains in simple shear. Subsequently, three‐dimensional FE analyses of compression with friction and instability propagation in tension are used as a means to demonstrate the robustness of the implementation and the potential occurrence of stress oscillations and shear bands in large‐strain analyses. Copyright © 2013 John Wiley & Sons, Ltd.
Inhibitory role of Smad7 in hepatocarcinogenesis in mice and in vitro
Authors: Wang Jia , Zhao Jingmin , Chu Eagle SH , Mok Myth TS , Go Minnie YY , Man Kwan , Heuchel Rainer , Lan Hui Yao , Chang Zhijie , Sung Joseph JY , Yu Jun 
Published: April 2013

AbstractSmad7 is a principal inhibitor of the TGFβ–Smad signalling pathway. We have investigated the functional significance of Smad7 in hepatocellular carcinoma (HCC). Smad7 knockout (KO) and wild‐type (WT) mice were injected with diethylnitrosamine (DEN) to induce HCC. The effects of Smad7 on cellular features were examined in HCC cells, using a Smad7 over‐expression or deletion approach. Signalling pathway components modulated by Smad7 in HCC were evaluated using luciferase reporter assay and co‐immunoprecipitation. Smad7 was down‐regulated in human HCCs compared with the adjacent normal tissues (p < 0.001). Smad7 KO mice were more susceptible to DEN‐induced HCC than WT mice (78% versus 22%, p < 0.05). HCCs from KO mice displayed a greater proliferation activity (p < 0.05) and a reduced apoptotic index compared with WT littermates (p < 0.05). Deletion of Smad7 promoted cell proliferation in primary cultured HCC cells. In addition, over‐expression of Smad7 in HCC cell lines markedly suppressed cell growth (p < 0.0001) and colony formation (p < 0.01). Cell cycle analysis revealed an increase in the G1 phase and a reduction in the S‐phase populations, accompanied by up‐regulation of p27Kip1 and down‐regulation of cyclin D1. Smad7 increased cell apoptosis (p < 0.01) by mediating an intrinsic [caspase‐9, caspase‐3 and poly(ADP‐ribose) polymerase] apoptotic pathway. Moreover, Smad7 inhibited NF‐κB signalling by interacting with TAB2, an upstream activator of NF‐κB, and inhibited TGFβ signalling by suppressing phosphorylation of Smad3. In conclusion, loss of Smad7 enhances susceptibility to HCC. Smad7 suppresses HCC cell growth by inhibiting proliferation and G1–S phase transition and inducing apoptosis through attenuation of NF‐κB and TGFβ signalling. Smad7 acts as a potential tumour suppressor in liver. Copyright © 2013 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
A 7‐Year Case of Furosemide‐Induced Immune Thrombocytopenia
Authors: Ochoa Pamella S. , Fisher Tye 
Published: April 2013

Immune thrombocytopenia has been attributed to many causes. Several drugs have been implicated as culprits in causing drug‐induced thrombocytopenia. Although the mechanism for this type of thrombocytopenia is not well understood, at least three types of antibodies appear to be involved: drug‐dependent antibodies, hapten‐dependent antibodies, and drug‐induced platelet‐reactive autoantibodies. In this report, we describe a case in which furosemide was identified as the probable cause of drug‐induced thrombocytopenia in an 84‐year‐old man with chronic symptomatic idiopathic thrombocytopenia for seven years before discovery. The patient's platelet count and daily furosemide dose, both intravenous and oral, were documented throughout his medical history. A dose‐dependent change in platelet count was observed in association with the furosemide dose. His platelet count increased on discontinuation of furosemide and beginning of torsemide. Several months after discontinuation of furosemide, his platelet count increased to a 9‐year high of 206 × 103/mm3 from a low of 36 × 103/mm3 while receiving furosemide therapy. Based on the observations of this case report, clinicians should more readily consider furosemide as a potential cause of thrombocytopenia.
Fabrication of ferrogels using different magnetic nanoparticles and their performance on protein adsorption
Authors: Gonzalez Jimena S. , Nicolás Paula , Ferreira María Luján , Avena Marcelo , Lassalle Verónica L. , Alvarez Vera A. 
Published: April 2013

AbstractMagnetic biomaterials were prepared using magnetite and chitosan‐coated magnetite nanoparticles (CSNPs) dispersed in poly(vinyl alcohol) gels. Two different methods were developed to obtain ferrogels: in situ co‐precipitation of magnetite (Ferro‐IS) and by adding previously synthesized CSNPs to the neat matrix (Ferro‐CSNPs). In both cases, the crosslinking was carried out by freezing − thawing (F‐T). The as‐prepared materials as well as precursor CSNPs were characterized by Fourier transform infrared spectroscopy, electronic microscopy (scanning and transmission), X‐ray diffraction, ζ potential, dynamic light scattering, thermogravimetric analysis, differential scanning calorimetry and magnetic properties. The performance of these gels as protein adsorbents was evaluated. Batch adsorption experiments were carried out using bovine serum albumin (BSA) as a model. Substantially different adsorption behaviour was found using Ferro‐IS and Ferro‐CSNPs. This was assigned to dissimilar bonding mechanisms of BSA to the ferrogel matrix. Hence, biomaterials potentially useful in drug delivery as well as in protein purification fields may be prepared by a relatively simple, non‐toxic and low cost method. © 2013 Society of Chemical Industry
Migration and Demographic Change
Authors: Findlay Allan M. , Wahba Jackline 
Published: April 2013

ABSTRACTAcademics have viewed migration from many different perspectives. This paper asks what is new about how migration impacts on population change and inversely how does population change produce new migration outcomes. Three features are singled out. First, the significance of structuring forces such as international recruitment agencies and social networks are identified as very important in shaping the impact of migration on host populations. Second, it is noted that population mobility challenges traditional patterns of care provision across the life course. Third, the changing significance of contextual factors (space, place, and household environments) has transformed the impact of migration on population change. The paper also explores how new datasets and new research methods can offer novel insights of the relation between population mobility and demographic change. Copyright © 2013 John Wiley & Sons, Ltd.
Germanium antimony lateral nanowire phase change memory by chemical vapor deposition
Authors: Gholipour Behrad , Huang Chung‐Che , Ou Jun‐Yu , Hewak Daniel W. 
Published: April 2013

Abstractmagnified imageThe phase change technology behind the current rewritable optical disks and the latest generation of electronic memories has provided clear commercial and technological advances for the field of data storage; by virtue of the many key attributes chalcogenide materials offer. In this work, germanium antimony (Ge–Sb) lateral nanowire phase change memory devices have been fabricated from thin films deposited by chemical vapor deposition (CVD). Deposition takes place at atmospheric pressure using metal chloride precursors at reaction temperatures between 750 and 875 °C. The fabricated devices have been characterized electrically demonstrating reversible phase change, while a lowering in power consumption in these memory cells is observed with scaling of the geometry of the nanowire cells. The results are investigated by electrothermal modeling to understand the temperature of the devices during operation. These prototype CVD‐grown Ge–Sb lateral nanowire devices show promise for applications such as phase‐change memory and optical, electronic, and plasmonic switching.magnified image Artistic impression of Ge–Sb nanowire memory device.
Diameter and Density Control of Single‐Walled Carbon Nanotube Forests by Modulating Ostwald Ripening through Decoupling the Catalyst Formation and Growth Processes
Authors: Sakurai Shunsuke , Inaguma Masayasu , Futaba Don N. , Yumura Motoo , Hata Kenji 
Published: April 2013

AbstractA continuous and wide range control of the diameter (1.9−3.2 nm) and density (0.03−0.11 g cm−3) of single‐walled carbon nanotube (SWNT) forests is demonstrated by decoupling the catalyst formation and SWNT growth processes. Specifically, by managing the catalyst formation temperature and H2 exposure, the redistribution of the Fe catalyst thin film into nanoparticles is controlled while a fixed growth condition preserved the growth yield. The diameter and density are inversely correlated, where low/high density forests would consist of large/small diameter SWNTs, which is proposed as a general rule for the structural control of SWNT forests. The catalyst formation process is modeled by considering the competing processes, Ostwald ripening, and subsurface diffusion, where the dominant mechanism is found to be Ostwald ripening. Specifically, H2 exposure increases catalyst surface energy and decreases diameter, while increased temperature leads to increased diffusion on the surface and an increase in diameter.
Transient Inclusion Evolution during RH Degassing
Authors: Yang Guangwei , Wang Xinhua , Huang Fuxiang , Wang Wanjun , Yin Yuqun 
Published: April 2013

AbstractInclusion morphology, composition and number at different times of RH vacuum treatment were investigated on API‐X70 pipeline steel with ASPEX. It is found that the inclusions are mainly globular CaO–Al2O3–MgO. The inclusion number decreases with time during RH treatment and the removal ratio can reach 72% after 28 min treatment. The initial number of inclusion plays a vital role in final inclusion number, so efforts must be made to eliminate the inclusion before RH treatment to get a highly clean steel. Non‐liquid inclusions including C3A (C is CaO and A is Al2O3) and Al2O3 · MgO decrease much more quickly and thoroughly than liquid ones, C12A7. This can be explained by the fact that non‐liquid inclusions have a much higher contact angle and interfacial energy but a much lower work of adhesion than liquid ones between inclusion and steel melt.
Experimental investigation of the root flow in a horizontal axis wind turbine
Authors: Akay B. , Ragni D. , Simão Ferreira C.J. , van Bussel G.J.W. 
Published: April 2013

ABSTRACTThis research investigates the flow behavior and its features in the blade's root region of a horizontal axis wind turbine by using stereoscopic particle image velocimetry (PIV) technique. Wind tunnel tests are conducted to measure the velocity field, phase‐locked with the blade motion, at different azimuth angles and at different spanwise positions. The pressure distribution is obtained from PIV velocity field by solving the Navier–Stokes momentum equations. In this paper, we aim to answer two questions: (i) How is the flow behavior in the root region? (ii) How is the evolution of the root vortex? The analysis of the velocity fields shows an outboard radial flow motion in the root region and a vorticity driven inboard motion at the bladeŠs maximum chord position. As a result of this vorticity driven flow, an increase in the axial velocity close to nacelle is measured. Wake sheets are observed and further discussed in the measured velocity and vorticity distributions. The formation and evolution of the root vortices conveyed downstream by the axial velocity are analyzed through vorticity and pressure distributions. Although the azimuthal vorticity in 3D representation is showing the trailing vorticity, the tilting of the root vortex tube is observed in the axial vorticity distribution. Moreover, the radial vorticity and azimuthal velocity from chordwise measurements show separation on the suction surface of the blade. This research concluded that the flow in the blade wake is driven by the root vortex; hence, the local effects of the root vortex cannot be ignored. Copyright © 2013 John Wiley & Sons, Ltd.
Linear relationship of damping ratios in resonance‐type fatigue testing of a wind turbine blade
Authors: Lee Hak Gu , Park Jisang 
Published: April 2013

ABSTRACTDamping ratios during resonance‐type fatigue testing of a 44 m wind turbine blade were found with respect to six different test setups. Based on a suggested parameter, six different lines of damping ratios at different test setups were linearized into a single line. Using the line, damping ratios at other plausible test setups can be predicted. Copyright © 2013 John Wiley & Sons, Ltd.
A New Two‐Dimensional Manganese(II) Coordination Polymer Constructed from Trinuclear Molecular Building Block: Syntheses, Structure and Magnetic Property
Authors: He Chao‐Jun , Wang Wei‐Yang , Wang Yu‐Fang 
Published: April 2013

Abstract A new manganese(II) coordination polymer, [Mn3(atpt)3(2, 2′‐bpy)2]n (1) (H2atpt = 2‐aminoterephthalic acid; 2, 2′‐bpy = 2, 2′‐bipyridine), was synthesized by hydrothermal reaction of Mn(OAc)2, H2atpt, and 2, 2′‐bpy. It was structurally characterized by element analysis, IR spectroscopy, powder XRD, and magnetic measurements. X‐ray single‐crystal analysis was carried out for 1, which crystallizes in the orthorhombic system, space group Pbca. The single X‐ray diffraction studies reveal that 1 consists of infinite layers of alternating trinuclear manganese subunits and H2atpt ligands. There are two types of different coordination modes of H2atpt in 1. Magnetic susceptibility data for 1 were measured in the range 3–300 K. There are antiferromagnetic interactions between manganese ions of 1.