bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multiresonance small square slot antenna for ultra‐wideband applications
Authors: Ojaroudi M. , Faramarzi A. 
Published: June 2011

AbstractA novel multiresonance slot antenna, for ultra‐wideband (UWB) applications is proposed.The proposed antenna consists of a modified radiating patch a ground plane with four L‐shaped slots which provides a wide usable fractional bandwidth of more than 135% (2.89–14.53 GHz). By cutting four modified L‐shaped slot with variable dimensions on the corners of ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the middle band unlike other antennas reported in the literature to date, the proposed antenna displays a good omnidirectional radiation pattern even at higher frequencies. The designed antenna has a small size of 35 × 35 mm2. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26214
Compact microstrip bandpass filters using dual‐mode stub‐loaded resonators and capacitive/inductive source‐load coupling
Authors: Torabi Amir , Forooraghi Keyvan , Manoochehri Omid , Abbasiniazare Seyyedpayam 
Published: June 2011

AbstractIn this article, compact microstrip bandpass filters using dual‐mode stub‐loaded resonators and capacitive/inductive source‐load coupling are presented to realize opposite asymmetric quasi‐elliptic responses. Two transmission zeros are generated in each design to sharpen the cutoff slope at the two sides of the passband. Both the coupling matrix and the equivalent circuit approaches are adopted to investigate the operating mechanism of the proposed filters. Restrictions imposed on the individual coupling coefficients by the implementation of this type of filters are discussed in detail. The proposed bandpass filters are designed at the center frequency of 2.4 GHz with the bandwidth of 200 MHz. The simulated and measured results are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26215
New and accurate synthesis formulas for asymmetric coplanar waveguides
Authors: Kaya S. , Guney K. 
Published: June 2011

AbstractIn this letter, new and accurate synthesis formulas to compute the physical dimensions of asymmetric coplanar waveguide (ACPW) are presented. The synthesis formulas are obtained with the use of differential evolution algorithm (DEA), genetic algorithm (GA), particle swarm optimization (PSO), and simulated annealing (SA) algorithm. The synthesis formulas are useful to microwave engineers for accurately calculating the physical dimensions of ACPWs. The results of the synthesis formulas are compared with the quasi‐static analysis, a full‐wave electromagnetic simulator IE3D, and experimental results obtained in this work. The average percentage errors of the synthesis formulas found by using DEA, GA, PSO, and SA algorithm are calculated to be 0.56, 0.62, 0.87, and 0.88%, respectively, for 2079 ACPW samples having different electrical parameters and physical dimensions, as compared with the results of respective quasi‐static analysis. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26224
A simple printed dipole antenna with dual‐band behavior
Authors: Ooi Pei Cheng , Selvan Krishnasamy T. 
Published: June 2011

AbstractThis paper reports a simple printed dipole antenna which exhibits dual‐band operations.The antenna's radiation pattern is bidirectional in the x–y plane and close‐to‐omnidirectional in the x–z plane. The 10 dB impedance bandwidths achieved are 38.6% and 4.7% centered at 1.1 and 2.3 GHz, respectively. The impedance and radiation characteristics of the proposed antenna, as studied by both simulation and experiment, are satisfactory. The antenna's performance compares well with that of a recently proposed dipole antenna with fractal shape. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26226
Incidence of childhood leukemia in Yogyakarta, Indonesia, 1998–2009
Authors: Supriyadi Eddy , Widjajanto Pudjo H. , Purwanto Ignatius , Cloos Jacqueline , Veerman Anjo J.P. , Sutaryo Sutaryo 
Published: June 2011

AbstractBackgroundIn most developing countries, incidence data for childhood cancers are less reliable, because very few population‐based registries exist. The aim of this study was to present the epidemiology of childhood leukemia in the Dr. Sardjito Hospital (DSH) region, which catchment area extends beyond the boundaries of the Yogyakarta Special Province (YSP).ProcedureHealth records of children, 0–14 years of age, who were diagnosed with leukemia between January 1998 and December 2009, were reviewed. Diagnosis of leukemia was confirmed by morphological and histochemical examination of marrow samples.ResultsThe estimated average annual incidence rate (AAIR) of childhood acute leukemia in DSH was 46.2 per million per year. Interestingly, the annual incidence rate (AIR) of childhood acute leukemia from the catchment area of DSH significantly increased from 35 in 1999 to 70 in 2009 (ANOVA, P = 0.003). The YSP population data, analyzed separately, showed an increase in AIR from 15.7 to 32.9 (ANOVA, P = 0.325) and an AAIR of 28.8. Remarkably, a relatively high frequency (25.5% in DSH and 27.7% in YSP) of children with AML was found in the group of acute leukemias.ConclusionThe DSH incidence calculations may be overestimated due to an underestimation of the population number. Since the population count for YSP is more precise, the data of YSP were used for comparison with developed countries. AAIR of ALL (20.8) is relatively low compared to Western countries (22.4–37.9). The AAIR of AML (8.0) is similar to Western countries (5.0–8.0) resulting a relatively high percentage of AML versus ALL (27.7%) in YSP. Pediatr Blood Cancer 2011; 57: 588–593. © 2011 Wiley‐Liss, Inc.
A phase II study of amifostine in children with myelodysplastic syndrome: A report from the Children's Oncology Group study (AAML0121)
Authors: Mathew Prasad , Gerbing Robert , Alonzo Todd A. , Wallas Tanya , Gong Jerald Z. , Jasty Rama , Jorstad Dean T. , Raimondi Susana C. , Chavez Cathy M. , Eisenberg Nancy L. , Hirsch Betsy , Gamis Alan , Smith Franklin O. , Arceci Robert J. 
Published: June 2011

AbstractBased on its potential role in adult myelodysplastic syndrome (MDS), the Children's Oncology Group (COG) embarked on a phase II study using amifostine in pediatric MDS (WHO 2001 criteria) patients. Responses were evaluated after two cycles. Ten patients were enrolled; five were deemed ineligible, and four withdrew after the first course. Only one patient completed two courses, and was found to be in complete remission. The study was closed after being open for 2 years due to slow accrual. Studying a rare disease like MDS may pose insurmountable obstacles even in a large clinical trials group such as COG, in part because of the changing definitions of MDS and the rarity of adult type MDS in children. The role of amifostine in pediatric MDS was not known at the time of study. Pediatr Blood Cancer 2011; 57: 1230–1232. © 2011 Wiley Periodicals, Inc.
TSAR, a new graph–theoretical approach to computational modeling of protein side‐chain flexibility: Modeling of ionization properties of proteins
Authors: Stroganov Oleg V. , Novikov Fedor N. , Zeifman Alexey A. , Stroylov Viktor S. , Chilov Ghermes G. 
Published: June 2011

AbstractA new graph–theoretical approach called thermodynamic sampling of amino acid residues (TSAR) has been elaborated to explicitly account for the protein side chain flexibility in modeling conformation‐dependent protein properties. In TSAR, a protein is viewed as a graph whose nodes correspond to structurally independent groups and whose edges connect the interacting groups. Each node has its set of states describing conformation and ionization of the group, and each edge is assigned an array of pairwise interaction potentials between the adjacent groups. By treating the obtained graph as a belief‐network—a well‐established mathematical abstraction—the partition function of each node is found. In the current work we used TSAR to calculate partition functions of the ionized forms of protein residues. A simplified version of a semi‐empirical molecular mechanical scoring function, borrowed from our Lead Finder docking software, was used for energy calculations. The accuracy of the resulting model was validated on a set of 486 experimentally determined pKa values of protein residues. The average correlation coefficient (R) between calculated and experimental pKa values was 0.80, ranging from 0.95 (for Tyr) to 0.61 (for Lys). It appeared that the hydrogen bond interactions and the exhaustiveness of side chain sampling made the most significant contribution to the accuracy of pKa calculations. Proteins 2011; © 2011 Wiley‐Liss, Inc.
Fate and transport of glyphosate and aminomethylphosphonic acid in surface waters of agricultural basins
Authors: Coupe Richard H , Kalkhoff Stephen J , Capel Paul D , Gregoire Caroline 
Published: June 2011

AbstractBACKGROUND: Glyphosate [N‐(phosphonomethyl)glycine] is a herbicide used widely throughout the world in the production of many crops and is heavily used on soybeans, corn and cotton. Glyphosate is used in almost all agricultural areas of the United States, and the agricultural use of glyphosate has increased from less than 10 000 Mg in 1992 to more than 80 000 Mg in 2007. The greatest intensity of glyphosate use is in the midwestern United States, where applications are predominantly to genetically modified corn and soybeans. In spite of the increase in usage across the United States, the characterization of the transport of glyphosate and its degradate aminomethylphosphonic acid (AMPA) on a watershed scale is lacking.RESULTS: Glyphosate and AMPA were frequently detected in the surface waters of four agricultural basins. The frequency and magnitude of detections varied across basins, and the load, as a percentage of use, ranged from 0.009 to 0.86% and could be related to three general characteristics: source strength, rainfall runoff and flow route.CONCLUSIONS: Glyphosate use in a watershed results in some occurrence in surface water; however, the watersheds most at risk for the offsite transport of glyphosate are those with high application rates, rainfall that results in overland runoff and a flow route that does not include transport through the soil. Copyright © 2011 Society of Chemical Industry
Organic co‐decomposition method for the synthesis of Mn and Co doped ZnO submicrometer crystals: Photoluminescence and magnetic properties
Authors: Wang H. B. , Wang H. , Wang X. N. , Zhang J. , Wu S. , Duan J. X. , Jiang Y. 
Published: June 2011

AbstractWe report on the optical and magnetic characteristics of the Co and Mn doped ZnO submicrometer crystals (SMCs) synthesised by organic thermal decomposition method. The doped ZnO SMCs are hexagon cone in shape with size ranging from 100 to 400 nm. X‐ray diffraction, transmission electron microscopy, and X‐ray photoelectron spectroscopy measurements indicate that the Mn2+ and Co2+ are doped into the ZnO lattice with concentration of 5.4 and 4.85%, respectively. Optical absorption spectra of the doped SMCs display additional peaks associated with d–d crystal‐field transitions due to the presence of tetrahedral Co2+ or Mn2+ ions. Photoluminescence of the samples shows suppressed band‐gap emission, indicating that the Mn or Co ions in the ZnO lattice increase the non‐irradiative recombination processes. Magnetic property measurements reveal that the Mn:ZnO SMCs are paramagnetic while the Co:ZnO exhibit weak ferromagnetism at 300 K.
In‐Situ Study of the Microstructure Development in a CrMnNi TRIP Steel During Plastic Deformation
Authors: Borisova Daria , Klemm Volker , Schreiber Gerhard , Rafaja David 
Published: June 2011

AbstractThe microstructure development in CrMnNi TRIP steel during the onset of the plastic deformation was investigated with the aid of in‐situ X‐ray diffraction experiments. The analysis of the shift and broadening of the X‐ray diffraction lines allowed the elastic and the plastic components of the lattice deformation to be separated from each other. This separation made possible to follow the formation of the microstructure features like stacking faults, deformation bands and local lattice rotations that were afterwards confirmed by X‐ray diffraction with high resolution, scanning electron microscopy and transmission electron microscopy.
Complete Meiosis from Human Induced Pluripotent Stem Cells
Authors: Eguizabal C. , Montserrat N. , Vassena R. , Barragan M. , Garreta E. , Garcia-Quevedo L. , Vidal F. , Giorgetti A. , Veiga A. , Belmonte J. C. Izpisua 
Published: June 2011

Abstract
Gamete failure-derived infertility affects millions of people worldwide; for many patients, gamete donation by unrelated donors is the only available treatment. Embryonic stem cells (ESCs) can differentiate in vitro into germ-like cells, but they are genetically unrelated to the patient. Using an in vitro protocol that aims at recapitulating development, we have achieved, for the first time, complete differentiation of human induced pluripotent stem cells (hiPSCs) to postmeiotic cells. Unlike previous reports using human ESCs, postmeiotic cells arose without the over-expression of germline related transcription factors. Moreover, we consistently obtained haploid cells from hiPSCs of different origin (keratinocytes and cord blood), produced with a different number of transcription factors, and of both genetic sexes, suggesting the independence of our approach from the epigenetic memory of the reprogrammed somatic cells. Our work brings us closer to the production of personalized human gametes in vitro.
Optimal sensor placement for structural health monitoring based on multiple optimization strategies
Authors: Yi Ting‐Hua , Li Hong‐Nan , Gu Ming 
Published: June 2011

SUMMARYCareful selection and placement of sensors are the critical issue in the construction and implementation of an effective structural health monitoring system. A hybrid method termed the optimal sensor placement strategy (OSPS) based on multiple optimization methods is proposed in this paper. The initial sensor placement is firstly obtained by the QR factorization. Then, using the minimization of the off‐diagonal elements in the modal assurance criterion matrix as a measure of the utility of a sensor configuration, the quantity of the sensors is determined by the forward and backward sequential sensor placement algorithm together. Finally, the locations of the sensor are determined by the dual‐structure coding‐based generalized genetic algorithm (GGA). Taking the scientific calculation software matlab (MathWorks, Natick, MA, USA) as a platform, an OSPS toolbox, which is working as a black box, is developed based on the command‐line compiling and graphical user interface‐aided graphical interface design. The characteristic and operation method of the toolbox are introduced in detail, and the scheme selection of the OSP is carried out on the world's tallest TV tower (Guangzhou New TV Tower) based on the developed toolbox. The results indicate that the proposed method is effective and the software package has a friendly interface, plenty of functions, good expansibility and is easy to operate, which can be easily applied in practical engineering. Copyright © 2011 John Wiley & Sons, Ltd.
Purification and properties of phenolic acid decarboxylase from Candida guilliermondii
Authors: Huang Hui-Kai , Tokashiki Masamichi , Maeno Sayaka , Onaga Shoko , Taira Toki , Ito Susumu 
Published: June 2011

Abstract
A heat-labile phenolic acid decarboxylase from Candida guilliermondii (an anamorph of Pichia guilliermondii) was purified to homogeneity by simple successive column chromatography within 3 days. The molecular mass was 20 kDa by sodium dodecyl sulfate–polyacrylamide gel electrophoresis and 36 kDa by gel-filtration chromatography, suggesting that the purified enzyme is a homodimer. The optimal pH and temperature were approximately 6.0 and 25°C. Characteristically, more than 50% of the optimal activity was observed at 0°C, suggesting that this enzyme is cold-adapted. The enzyme converted p-coumaric acid, ferulic acid, and caffeic acid to corresponding products with high specific activities of approximately 600, 530, and 46 U/mg, respectively. The activity was stimulated by Mg2+ ions, whereas it was completely inhibited by Fe2+, Ni2+, Cu2+, Hg2+, 4-chloromericuribenzoate, N-bromosuccinimide, and diethyl pyrocarbonate. The enzyme was inducible and expressed inside the cells moderately by ferulic acid and p-coumaric acid and significantly by non-metabolizable 6-hydroxy-2-naphthoic acid.
Fatty Acid Status Determination by Cheek Cell Sampling Combined with Methanol‐Based Ultrasound Extraction of Glycerophospholipids
Authors: Klingler Mario , Demmelmair Hans , Koletzko Berthold , Glaser Claudia 
Published: June 2011

AbstractTissue and blood fatty acid compositions are used as biological markers of fatty acid intakes to improve dietary assessments. These approaches are invasive and not well accepted, particularly in infants and young children. We developed a sensitive method for the analysis of fatty acids in cheek cell glycerophospholipids, which includes significant improvements of cell sampling, non‐chromatographic isolation of glycerophospholipids and base‐catalyzed synthesis of fatty acid methyl esters. Sphingophospholipids are not detected by this method. This enables a highly accurate determination of cheek cell glycerophospholipid fatty acids, even if cell numbers are limited. Coefficients of variation for fatty acids contributing more than 0.3% to total glycerophospholipid fatty acids are below 10% in samples with more than 105 cells. Good correlations were shown between docosahexaenoic and eicosapentaenoic acid percentages in cheek cell and plasma glycerophospholipids (r = 0.83 and 0.64, respectively; P < 0.001) with a linear relationship over the whole concentration range observed in adult study participants (n = 29). Cheek cell sampling is non‐invasive and can easily be applied in infants. The accuracy and reliability of this new method is comparable to conventional invasive methods for the determination of the n‐3 fatty acid status in humans, and it is well applicable in interventional or epidemiological studies.
Analysis of Nonlinear Stress and Strain in Clay under the Undrained Condition
Authors: Hsieh P.-G. , Ou C.-Y. 
Published: June 2011

ABSTRACTThough the total stress undrained analysis approach in geotechnical engineering is widely utilized by practicing engineers, it has some intrinsic imperfections that cause the obtained parameters to have unavoidable empirical correlations. In this study, an undrained soft clay model is developed, which overcomes the imperfections of the conventional total stress undrained approach. In addition, the high soil stiffness at small strain and the concept of yield surface are employed to realistically simulate actual soil behavior. The model parameters can be obtainable directly from conventional laboratory tests. The model is validated through different laboratory stress path tests and strength tests in this paper.
Acoustic Scattering and Radiation Force Function Experienced by Functionally Graded Cylindrical Shells
Authors: Jamali J. , Naei M.H. , Honarvar F. , Rajabi M. 
Published: June 2011

ABSTRACTA body insonified by a sound field is known to experience a steady force that is called the acoustic radiation force. In this paper, the method of wave function expansion is adopted to study the scattering and the radiation force function caused by a plane normal harmonic acoustic wave incident upon an arbitrarily thick-walled functionally graded cylindrical shell submerged in and filled with compressible ideal fluids. A laminate approximate model and the so-called state space formulation in conjunction with the classical transfer matrix (T-matrix) approach are employed to present an analytical solution based on the two-dimensional exact equations of elasticity. Two typical models, representing the elastic properties of FGM interlayer, are considered. In both models, the mechanical properties of the graded shell are assumed to vary smoothly and continuously with the change of volume concentrations of the constituting materials across the thickness of the shell. In the first model, the simple rule of mixture governs. In the second, an elegant self-consistent micromechanical model which assumes an interconnected skeletal microstructure in the graded region is employed. Particular attention is paid on dynamical response of these models in a wide range of frequency and for different shell wall-thicknesses. In continue, by focusing on the second model, the normalized radiation force function and the form function amplitude are calculated and compared for different shell wall thicknesses and various profile of variations. Limiting cases are considered and good agreements with the solutions available in the literature are obtained.
Evaluation of Crack Occurrence Probability of T-Shape Welded Structures
Authors: Hsu Y. , Wu W.-F. , Kuo H.-T. 
Published: June 2011

ABSTRACTWelded structures are vulnerable to fracture due to cracks, especially at the welds. To investigate the safety of T-Shape welded structures used in some construction sites, a method is proposed in this paper to evaluate the crack occurrence probabilities of the structures. Three major factors that affect the crack occurrence are taken into consideration. They are residual stress, diffusible hydrogen content and chemical composition of the weld metal. In the analysis, finite element analysis is performed to find the residual stress distribution of the structures. The uncertainties of diffusible hydrogen content and chemical composition are treated as random variables. The critical cooling time is found and utilized for evaluating the crack occurrence probability of the welded structure. Numerical results indicate that T-shape welded joints lead to higher residual stresses and higher crack occurrence probabilities in comparison with the traditional butt joints. Therefore, more attention should be paid to this kind of welded joints when they are used.