bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wideband U‐shaped dielectric resonator antenna fed by triangle patch
Authors: Zhang Li‐Na , Zhong Shun‐Shi , Liang Xian‐Ling 
Published: August 2010

AbstractA U‐shaped dielectric resonator antenna fed by a conformal triangle patch is proposed for ultrawideband communication applications.The multiband resonances of two parts, the U‐shaped dielectric resonator and the triangle patch, are combined to expand the antenna bandwidth. To validate the design, an optimized antenna prototype was fabricated and measured. A good agreement between the simulated and measured results is achieved, and a measured bandwidth of 84.1% around the center frequency 5.375 GHz is obtained with the broadside radiation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2435–2438, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25513
Frequency‐multiplier design using negative‐image device models
Authors: Kim Nam‐Tae 
Published: August 2010

AbstractThis article presents a novel design methodology for wireless frequency multipliers using negative‐image device models applicable to nonlinear devices. Negative‐image device models of nonlinear devices are generated by incorporating optimization techniques into a hypothetical negative‐image multiplier model. The negative‐image device‐modeling methodology provides the following advantages over previously developed techniques: (1) It can predict achievable multiplier performance in the device‐modeling stage and (2) it provides an accurate starting point for the synthesis of impedance‐matching networks. The negative‐image device‐modeling method is described, and its application to the design of a field‐effect transistor (FET) frequency multiplier is presented. Results of an experimental implementation of the multiplier demonstrate the effectiveness of the proposed methodology. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2544–2548, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25521
Quantum cryptography via a wavelength router for internet security
Authors: Threepak T. , Mitatha S. , Luangvilay X. , Yupapin P. P. 
Published: August 2010

AbstractWe propose a new system of quantum cryptography for internet security using Gaussian pulses propagating within a nonlinear ring resonator system, quantum processor, and a wavelength router. To increase the channel capacity and security, the multiplexer is operated incorporating a quantum processing unit via an optical multiplexer. The transmission part can be used to generate the high capacity quantum codes within the series of microring resonators and an add/drop filter. The receiver part can be communicated by using the quantum key (quantum bit, qubit) via a wavelength router and quantum processors. The reference states can be recognized by using the cloning unit, which is operated by the add/drop filter, where the communication between Alice and Bob can be performed. Results obtained have shown that the correlated photons can be generated and formed the entangled photon pair, which is allowed to form the secret key between Alice and Bob. In application, the embedded system within the computer processing unit is available for quantum computer. Furthermore, such a concept is also available for internet application via hybrid communications, for instance, wire/wireless, satellite, which can be used to form the internet security. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2505–2509, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25523
Accelerometer based on all‐fiber Fabry–Pérot interferometer formed by hollow‐core photonic crystal fiber
Authors: Ke Tao , Zhu Tao , Rao Yunjiang , Deng Ming 
Published: August 2010

AbstractAn all‐fiber Fabry–Pérot accelerometer based on cantilever structure is constructed in this article.The Fabry–Pérot interferometer is formed by splicing the ends of two SMF‐28e fibers to the cleaved end of a hollow‐core photonic crystal fiber (HCPCF). We analyzed the relationship between the length of HCPCF cavity, light intensity, voltage of photoelectronic detector, and the deflection of the cantilever free end. Thus, the simple theoretical formula is achieved to calculate acceleration. Experimental results show that the resolution of the measuring system is about 8.42 × 10−7g and the sensitivity is 0.3386 v/g. In addition, Such kind of Fabry–Perot sensing structure is low sensitive to temperature and bending. It is anticipated that the Fabry–Pérot interferometer accelerometers have wide application prospects in the field of inertial navigation and vibration measurements. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2531–2535, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25529
Noise‐parameter measurements with a reflection type phase shifter
Authors: Gu Dazhen , Walter David K. , Randa James 
Published: August 2010

AbstractWe report a miniaturized phase shifter operating in the frequency range from 5 to 7 GHz for noise‐parameter extraction. Such a tunable solid‐state unit represents a significant reduction in the size and mass as a source‐pull component, compared to its mechanical counterparts. It provides adequate impedance coverage, ultra‐fast response, as well as high repeatability, across the designed region. A packaged low‐noise amplifier was measured at integer frequencies by use of the phase shifter on the NIST NFRad system. The measured results exhibited good accuracy. The combined uncertainties (Type‐A and Type‐B) are below 6% for both the minimum noise temperature and the magnitude of the optimum input reflection coefficient. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2600–2603, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25532
Parallel efficient method of moments exploiting graphics processing units
Authors: De Donno D. , Esposito A. , Monti G. , Tarricone L. 
Published: August 2010

AbstractIn this article we adopt the graphical processing units as a low‐cost and efficient solution of challenging electromagnetic numerical problems. Based on the compute unified device architecture, an optimized method of moments algorithm has been implemented which adopts direct solvers based on LU decomposition. Numerical results obtained on the practical case of a patch antenna analysis demonstrate the high performance of the approach. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2568–2572, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25534
Wideband surface‐mount chip antenna for eight‐band LTE/WWAN slim mobile phone application
Authors: Wong Kin‐Lu , Lee Cheng‐Tse 
Published: August 2010

AbstractSurface‐mount chip antenna with a thin thickness of 3 mm and a small volume of 3 × 4 × 50 mm3 (0.6 cm3) for eight‐band long term evolution/wireless wide area network (LTE/WWAN) operation in the slim mobile phone is presented.The antenna is a simple two‐strip shorted monopole, yet it can provide two wide operating bands of at least 698–960/1710–2690 MHz to cover the three LTE bands (LTE700/2300/2500) and five WWAN bands (GSM850/900/1800/1900/UMTS). The antenna is suitable to be mounted on the no‐ground board space of the system circuit board of the mobile phone. Wideband operation is achieved by incorporating an on‐board feeding structure formed by a short shorting strip and a chip capacitor–loaded feeding strip, both are of 8 mm in length and disposed on the no‐ground board space, to the proposed chip antenna. Details of the antenna including the on‐board feeding structure are presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2554–2560, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25543
A W‐band monolithic down‐converter for MMW module based on metamorphic HEMTs
Authors: Baek Yong‐Hyun , Lee Sang‐Jin , Baek Tae‐Jong , Mun Sung‐Woon , Ko Dong‐Sik , Jeon Byoung‐Chul , Kim Wan‐Joo , Choi Jae‐Hyun , Lee Nam‐Jae , Rhee Jin‐Koo 
Published: August 2010

AbstractIn this article, we fabricated a 94 GHz monolithic down‐converter that consists of a two‐stage amplifier and a single‐balanced mixer using the 0.1‐μm metamorphic high electron mobility transistor (MHEMT) technology. The down‐converter of a 3.3 × 2.5 mm2 chip size shows a low conversion loss of ∼2.8 dB at 94 GHz and excellent LO‐to‐RF isolation above 35 dB in a frequency of 90–98 GHz. Also, we fabricated the millimeter‐wave (MMW) module that exhibits a conversion loss of 7–8.5 dB from 93.66 to 94.365 GHz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2618–2621, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25546
Structure and morphology of a commercial high‐impact polypropylene in‐reactor alloy synthesized using a spherical Ziegler–Natta catalyst
Authors: Mahdavi Hossein , Nook Mojtaba Enayati 
Published: August 2010

AbstractA commercial high‐impact polypropylene (hiPP) was fractionated by temperature‐gradient elution fractionation into nine fractions. All fractions were studied using Fourier transform infrared spectroscopy and differential scanning calorimetry. The amount of ethylene in the fractions was also determined. The results demonstrate that the ethylene–propylene statistical copolymer (or ethylene–propylene rubber, EPR) content in this hiPP is rather low and the amounts of ethylene–propylene segmented copolymer and ethylene–propylene block copolymer (that act as adhesive and compatibilizer between elastomeric phase and matrix, respectively) are negligible. Furthermore, the morphology of the resin was studied using scanning electron microscopy observations of microtome‐cut original and etched samples, which reveals that EPR particles are too large and their distribution inside the matrix is not uniform. Copyright © 2010 Society of Chemical Industry
A mutant form of PTEN linked to autism
Authors: Redfern Roberta E. , Daou Marie‐Claire , Li Li , Munson Mary , Gericke Arne , Ross Alonzo H. 
Published: August 2010

AbstractThe tumor suppressor, phosphatase, and tensin homologue deleted on chromosome 10 (PTEN), is a phosphoinositide (PI) phosphatase specific for the 3‐position of the inositol ring. PTEN has been implicated in autism for a subset of patients with macrocephaly. Various studies identified patients in this subclass with one normal and one mutated PTEN gene. We characterize the binding, structural properties, activity, and subcellular localization of one of these autism‐related mutants, H93R PTEN. Even though this mutation is located at the phosphatase active site, we find that it affects the functions of neighboring domains. H93R PTEN binding to phosphatidylserine‐bearing model membranes is 5.6‐fold enhanced in comparison to wild‐type PTEN. In contrast, we find that binding to phosphatidylinositol‐4,5‐bisphosphate (PI(4,5)P2) model membranes is 2.5‐fold decreased for the mutant PTEN in comparison to wild‐type PTEN. The structural change previously found for wild‐type PTEN upon interaction with PI(4,5)P2, is absent for H93R PTEN. Consistent with the increased binding to phosphatidylserine, we find enhanced plasma membrane association of PTEN‐GFP in U87MG cells. However, this enhanced plasma membrane association does not translate into increased PI(3,4,5)P3 turnover, since in vivo studies show a reduced activity of the H93R PTEN‐GFP mutant. Because the interaction of PI(4,5)P2 with PTEN's N‐terminal domain is diminished by this mutation, we hypothesize that the interaction of PTEN's N‐terminal domain with the phosphatase domain is impacted by the H93R mutation, preventing PI(4,5)P2 from inducing the conformational change that activates phosphatase activity.
Determining macromolecular assembly structures by molecular docking and fitting into an electron density map
Authors: Lasker Keren , Sali Andrej , Wolfson Haim J. 
Published: August 2010

AbstractStructural models of macromolecular assemblies are instrumental for gaining a mechanistic understanding of cellular processes. Determining these structures is a major challenge for experimental techniques, such as X‐ray crystallography, NMR spectroscopy and electron microscopy (EM). Thus, computational modeling techniques, including molecular docking, are required. The development of most molecular docking methods has so far been focused on modeling of binary complexes. We have recently introduced the MultiFit method for modeling the structure of a multisubunit complex by simultaneously optimizing the fit of the model into an EM density map of the entire complex and the shape complementarity between interacting subunits. Here, we report algorithmic advances of the MultiFit method that result in an efficient and accurate assembly of the input subunits into their density map. The successful predictions and the increasing number of complexes being characterized by EM suggests that the CAPRI challenge could be extended to include docking‐based modeling of macromolecular assemblies guided by EM. Proteins 2010. © 2010 Wiley‐Liss, Inc.
Nanocrystalline boron‐doped diamond films, a mixture of BCS‐like and non‐BCS‐like superconducting grains
Authors: Dahlem F. , Achatz P. , Williams O. A. , Araujo D. , Courtois H. , Bustarret E. 
Published: August 2010

AbstractScanning tunneling topography and spectroscopy are performed below 100 mK on granular nanocrystalline boron‐doped diamond (BDD) films. We found the superconductivity behavior to follow mainly the granular features of the BDD films. The temperature dependence of the local differential conductance spectra shows our nanocrystalline BDD films as made of grains with a supercondutivity either BCS‐like or non‐BCS‐like. Such a distribution is not discernible in transport measurements, which present a sharp macroscopic superconducting transition at a temperature of a few Kelvins. Our local scanning tunneling microscopies also confirm the good coupling between these grains: only a few opaque interfaces are detected. Such a transparency of intergrain interfaces is responsible for a proximity effect in weakly superconductive grains and an inverse proximity effect in strongly superconducting grains.
Local electrostatic charging differences of sub‐100 nm nanocrystalline diamond films
Authors: Verveniotis E. , Čermák J. , Kromka A. , Ledinský M. , Remeš Z. , Rezek B. 
Published: August 2010

AbstractNanocrystalline diamond (NCD) thin films are deposited on p‐type Si substrates at different deposition temperatures (600–820 °C) in thicknesses below 100 nm. The films are then terminated by oxygen using r.f. oxygen plasma. Atomic force microscopy (AFM) is used to induce electrostatically charged micrometer‐sized patterns on the diamond films by applying a bias voltage on the AFM tip during a contact mode scan. Trapped charge is detected by Kelvin force microscopy, showing potential shifts different in geometry and amplitude on each film for the same absolute bias voltages. The films have similar structure and grain size, measured by AFM and scanning electron microscope (SEM). Fourier transform infrared spectroscopy (FTIR) in reflection regime shows the solidity of the films. Material differences are resolved via micro‐Raman spectroscopy. Different charging properties are thus attributed to the differences in relative amount of diamond and sp2 phase.
Comparative study of TL created in undoped CVD diamond by β rays, UV and visible light
Authors: Chernov V. , Piters T. , May P. W. , Meléndrez R. , Pedroza‐Montero M. , Barboza‐Flores M. 
Published: August 2010

AbstractThe thermoluminescence (TL) properties of CVD diamond film irradiated with β rays and illuminated with UV and visible light (200–450 nm) have been studied. The film (23 µm) was grown for 47 h on monocrystalline silicon. The TL glow curves are similar for β irradiation and short wavelength UV light. The β dose response curves and UV light time response curves exhibit linear–supralinear–sublinear behaviour. The structure of the glow curve was determined by a simultaneous deconvolution of a set of curves recorded after preliminary heating to various temperatures. One set of the TL peak parameters was found for all the curves during the deconvolution. The TL glow curves were found to consist of five strongly overlapped peaks. The peaks at about 350 and 400 K obey first‐order kinetics. The next three peaks at about 480, 540 and 580 K are described well by general‐order kinetics. The TL curves created with light of wavelength between 250 and 450 nm are different from those created by β radiation and short wavelength UV light. The former have low sensitivity and consist of several strongly overlapped peaks, two of them are observed at about 330 and 600 K.
Doping of single crystalline diamond with nickel
Authors: Wolfer M. , Obloh H. , Williams O. A. , Leancu C.‐C. , Kirste L. , Gheeraert E. , Nebel C. E. 
Published: August 2010

AbstractNickel doped single crystal diamond layers were grown by microwave‐plasma enhanced chemical vapour deposition. Optical emission spectroscopy (OES) utilised during growth proved that the organometallic compound nickelocene is an applicable nickel source. It was possible to produce stable and adjustable nickel OES signals during growth by altering the flux of the nickelocene carrier gas. The successful incorporation of nickel into the diamond layers was verified by secondary ion mass spectrometry. Cathodoluminescence (CL) was applied to reveal optically active defects related to nickel. The signature of substitutionally incorporated nickel, namely the nickel related 1.4 eV centre, as well as the 2.369 and 1.563 eV centres were observed in CL. The latter is supposed to be a single‐photon emitter on the basis of a nickel–nitrogen defect centre.
The magnetic moments and their long‐range ordering for Fe atoms in a wide variety of metallic environments
Authors: Ayuela A. , March N. H. 
Published: August 2010

AbstractThe magnitudes of Fe magnetic moments, together with their long‐range ordering when appropriate, are compared and contrasted in a variety of metallic environments. Thus, Fe, in its stable body‐centered‐cubic (bcc) phase under ambient conditions, is considered under pressures p, which can yield different crystal structures at high p, including fcc. The modification of the ferromagnetism in bcc Fe is surveyed as one passes through a bc‐tetragonal lattice to the fcc form. In the latter, evidence is presented, both from theory and experiment, that the ordering is antiferromagnetic in character. Then, binary metallic alloys with Fe atoms as the majority component are considered, Fe–Co and Fe–Ga being focal points in both ordered and disordered materials. Finally, some discussion is given, involving again both experiment and theory, of the possible spin polarization of neighboring Cs atoms when Fe impurity atoms are inserted into the low conduction electron density characterizing this heavy alkali metal under ambient conditions. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2010
Scanning electron microscope (SEM) disclosure of the effects of snake venom on living tissue integrity and cell surfaces
Authors: Gennaro Joseph F. , Elek E. Deborah 
Published: August 2010

AbstractThe tissue destruction produced by the bite of the viper is well known and the venom enzyme[s] that produce it have been thoroughly studied. Not so well examined is the view of the damage available to the electron microscope, especially the scanning electron microscope. Here we have used the SEM to view the effects of viper venom on living tissue in situ. SCANNING 32: 155–158, 2010. © 2010 Wiley Periodicals, Inc.
Consistency of captive giraffe behavior under two different management regimes
Authors: Bashaw Meredith J. 
Published: August 2010

AbstractLong‐term animal behavior studies are sometimes conducted at a single site, leading to questions about whether effects are limited to animals in the same environment. Our ability to make general conclusions about behavior is improved when we can identify behaviors that are consistent across a range of environments. To extend Veasey and colleagues' ([1996b] Anim Welf 5:139–153) study, I compared not only activity budgets but also social behavior of an all‐female group of giraffe at The Maryland Zoo in Baltimore (MZiB) to those previously observed in breeding groups at The San Diego Zoo's Wild Animal Park (SDZWAP; Bashaw et al. [2007] J Comp Psychol 121:46–53). Morning activity budgets and the maintenance of social relationships were consistent across groups. MZiB female giraffe interacted more frequently and the identity of animals that formed the strongest relationships was less predictable than at SDZWAP. Results support earlier findings that captive giraffe maintain social relationships and suggest that studies of giraffe social relationships and activity are generalizable across a range of captive conditions. Zoo Biol 30:371–378, 2011. © 2010 Wiley‐Liss, Inc.
Meningococcal purpura fulminans in children. II: Late orthopedic sequelae management
Authors: Nectoux E. , Mezel A. , Raux S. , Fron D. , Klein C. , Herbaux B. 
Published: August 2010

Background Purpura fulminans is a rare and extremely severe infection, mostly due to Neisseria meningitidis. Nineteen patients were followed up immediately after the initial multivisceral failure in order to diagnose late-onset orthopedic sequelae. We report our experience with these 19 patients, in light of our medical follow-up protocol and surgical management. Materials and methods Nineteen patients were referred for acute purpura fulminans between 1987 and 2005 to our institution and followed up prospectively until the present. We collected information on all diagnosed orthopedic sequelae, all surgical procedures performed, and the actual orthopedic outcome. Results Fourteen patients developed at least one orthopedic sequel after a mean of 2 years delay, with a mean of 8.65 years follow-up (range 3–22 years). The most common presentation was lower limb physeal growth plate arrest in eight patients involving 18 growth plates, leading to five limb length discrepancies and 12 significant knee and/or ankle deviations. Patients were treated by completing epiphysiodesis in addition to limb lengthening and/or reaxation osteotomies, except for two patients, in which epiphysiolysis was performed. All outcomes are, to date, satisfactory, with both knee and ankle axes within the physiological range. Among the seven patients who underwent below-knee amputation, six needed stump revision because of skin conflict (4) or prosthetics misadaptation due to upper tibial varus (2). Regarding the upper limb, three patients presented with four cicatricial scar bands, one located on a ring finger, two at the first commissure, and one at the wrist (all were successfully treated by enlargement Z-plasties). Two patients developed hip avascular necrosis. Conclusion It is important for children diagnosed with meningococcal purpura fulminans to be followed up closely starting from the very beginning by a pediatric orthopedic surgeon. It ensures that late-onset orthopedic sequelae will be diagnosed early. In accordance to the literature, this study highlights the high rate of lower limb epiphysiodesis, above all other types of sequelae. This study reports a possible link between purpura fulminans and avascular necrosis of the hip.
Webportale für Gesundheit
Authors: Jähn Karl H. 
Published: August 2010

Einleitung
Die Inanspruchnahme von Informations- oder Kommunikationsangeboten zum Thema Gesundheit gehört seit der Verbreitung des World Wide Web zu den vorrangigen Interessen der Internetnutzer. Vor der Jahrtausendwende wurden von verschiedensten Anbietern erhebliche Investitionen getätigt, um eine günstige Position in dem seinerzeit viel versprechenden Zukunftsmarkt der Gesundheitsportale zu erzielen. Während sich die Situation der Refinanzierung – bis heute anhaltend – deutlich relativiert hat, bleiben vielerlei interessante Perspektiven bestehen.