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Search Results: 1 - 10 of 437793 matches for " P. J. Soh "
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A Dual-Band Circularly-Polarized Patch Antenna with a Novel Asymmetric Slot for WiMAX Application
S. M. Noghabei,S. K. A. Rahim,P. J. Soh,M. Abedian
Radioengineering , 2013,
Abstract: A compact design of a circularly-polarized (CP) microstrip antenna to achieve dual-band behavior for WiMAX applications is presented. A single-layered feed is used to excite a single square patch integrated with a novel asymmetrical slot and two different truncated corners to achieve CP polarization in both bands. Besides its structural simplicity, ease of fabrication and low-cost, the proposed antenna features a satisfactory impedance bandwidth of 7.2 % in the lower band (2.53 GHz) and 3.6 % in the upper band (5.73 GHz). The measured radiation pattern of the proposed antenna demonstrates directional patterns in both E- and H-planes with a 3 dB axial ratio of 2 % and 3.2 % in the lower and upper band, respectively.
Characterization of a Plain Broadband Textile PIFA
P.J Soh,G.A.E Vandenbosch,S.L Ooi,H.M.R Nurul
Radioengineering , 2011,
Abstract: Bandwidth characteristic of a wearable antenna is one of the major factors in determining its usability on the human body. In this work, a planar inverted-F antenna (PIFA) structure is proposed to achieve a large bandwidth to avoid serious antenna reflection coefficient detuning when placed in proximity of the body. The proposed structure is designed based on a simple structure, in order to provide practicality in application and maintain fabrication simplicity. Two different types of conductive textiles, namely Pure Copper Polyester Taffeta Fabric (PCPTF) and ShieldIt, are used in order to proof its concept, in comparison with a metallic antenna made from copper foil. The design is spaced and fabricated using a 6 mm thick fleece fabric. To cater for potential fabrication and material measurement inaccuracies, both antennas' performance are also investigated and analyzed with varying physical and material parameters. From this investigation, it is found that the proposed structure's extended bandwidth enabled the antenna to function with satisfactory on-body reflection coefficients, despite unavoidable gain and efficiency reduction.
Control of magnetic, non-magnetic and superconducting states in annealed Ca(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$
S. Ran,S. L. Bud'ko,W. E. Straszheim,J. Soh,M. G. Kim,A. Kreyssig,A. I. Goldman,P. C. Canfield
Physics , 2012, DOI: 10.1103/PhysRevB.85.224528
Abstract: We have grown single crystal samples of Co substituted CaFe2As2 using an FeAs flux and systematically studied the effects of annealing/quenching temperature on the physical properties of these samples. Whereas the as-grown samples (quenched from 960C) all enter the collapsed tetragonal phase upon cooling, annealing/quenching temperatures between 350C and 800C can be used to tune the system to low temperature antiferromagnetic/orthorhomic or superconducting states as well. The progression of the transition temperature versus annealing/quenching temperature (T-T$_{anneal}$) phase diagrams with increasing Co concentration shows that, by substituting Co, the antiferromagnetic/orthorhombic and the collapsed tetragonal phase lines are separated and bulk superconductivity is revealed. We established a 3D phase diagram with Co concentration and annealing/quenching temperature as two independent control parameters. At ambient pressure, for modest x and T$_{anneal}$ values, the Ca(Fe1-xCox)2As2 system offers ready access to the salient low temperature states associated with Fe-based superconductors: antiferromagnetic/orthorhombic, superconducting, and non-magnetic/collapsed tetragonal.
Spin polarization of Ru in superconducting Ba(Fe$_{0.795}$Ru$_{0.205}$)$_2$As$_2$ studied by x-ray resonant magnetic scattering
M. G. Kim,J. Soh,J. Lang,M. P. M. Dean,A. Thaler,S. L. Bud'ko,P. C. Canfield,E. Bourret-Courchesne,A. Kreyssig,A. I. Goldman,R. J. Birgeneau
Physics , 2013, DOI: 10.1103/PhysRevB.88.014424
Abstract: We have employed the x-ray resonant magnetic scattering (XRMS) technique at the Ru $L_2$ edge of the Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ ($x = 0.205$) superconductor. We show that pronounced resonance enhancements at the Ru $L_2$ edge are observed at the wave vector which is consistent with the antiferromagnetic propagation vector of the Fe in the undoped BaFe$_2$As$_2$. We also demonstrate that the XRMS signals at the Ru $L_2$ edge follow the magnetic ordering of the Fe with a long correlation length, $\xi_{ab} > 2850\pm400$ \AA . Our experimental observation shows that the Ru is spin-polarized in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ compounds.
NOTE ON VELOCITY TRANSFORMATIONS IN SPECIAL RELATIVITY.
关於狭义相对论内之速度变换式

HSIN P SOH,
束星北

物理学报 , 1951,
Abstract: Three dimensional velocity transformations in special relativity can form quaternion group if each is subject to a further rotation about the direction of the velocity through the same imaginary angle.
ON THE ADVANCED SOLUTION OF THE WAVE EQUATION
关於波动方程式之“超前解”

HSIN P SOH,
束星北

物理学报 , 1950,
Abstract: It is shown that the advanced solutions of the wave equation are identical with the retarded solutions when the boundary integrals are properly taken care of.
The non-magnetic collapsed tetragonal phase of CaFe2As2 and superconductivity in the iron pnictides
J. H. Soh,G. S. Tucker,D. K. Pratt,D. L. Abernathy,M. B. Stone,S. Ran,S. L. Bud'ko,P. C. Canfield,A. Kreyssig,R. J. McQueeney,A. I. Goldman
Physics , 2013,
Abstract: The relationship between antiferromagnetic spin fluctuations and superconductivity has become a central topic of research in studies of superconductivity in the iron pnictides. We present unambiguous evidence of the absence of magnetic fluctuations in the non-superconducting collapsed tetragonal phase of CaFe2As2 via inelastic neutron scattering time-of-flight data, which is consistent with the view that spin fluctuations are a necessary ingredient for unconventional superconductivity in the iron pnictides. We demonstrate that the collapsed tetragonal phase of CaFe2As2 is non-magnetic, and discuss this result in light of recent reports of high-temperature superconductivity in the collapsed tetragonal phase of closely related compounds.
Welfare Improvement and the Extension of the Income Gap under Monopoly  [PDF]
Yuhki Hosoya, Soh Kaneko
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.54069
Abstract: This study constructs a model of a monopoly where investors are also actors, and shows that, in contrast to traditional models, this model admits the welfare improvement caused by monopoly. This study also reveals that if a huge income gap exists in the initial stage, then monopoly exacerbates the expansion of the income gap caused by market trades. Moreover, we show that this exacerbation occurs in general situations under some additional (but natural) assumptions.
Compact starbursts in z~3-6 submillimeter galaxies revealed by ALMA
Soh Ikarashi,R. J. Ivison,Karina I. Caputi,Itziar Aretxaga,James S. Dunlop,Bunyo Hatsukade,DavidH. Hughes,Daisuke Iono,Takuma Izumi,Ryohei Kawabe,Kotaro Kohno,ClaudiaD. P. Lagos,Kentaro Motohara,Koichiro Nakanishi,Kouji Ohta,Yoichi Tamura,Hideki Umehata,Grant W. Wilson,Kiyoto Yabe,Min S. Yun
Physics , 2014, DOI: 10.1088/0004-637X/810/2/133
Abstract: We report the source size distribution, as measured by ALMA millimetric continuum imaging, of a sample of 13 AzTEC-selected submillimeter galaxies (SMGs) at z_photo ~ 3-6. Their infrared luminosities and star-formation rates (SFR) are L_IR ~ 2-6 x 10^12 L_sun and ~ 200-600 M_sun yr-1, respectively. The size of z ~ 3-6 SMGs ranges from 0".10 to 0".38 with a median of 0".20+0".03-0".05 (FWHM), corresponding to a median circularized effective radius (Rc,e) of 0.67+0.13-0.14 kpc, comparable to the typical size of the stellar component measured in compact quiescent galaxies at z ~ 2 (cQGs) --- R ~ 1 kpc. The median surface SFR density of our z ~ 3-6 SMGs is 100+42-26 M_sun yr-1 kpc-2, comparable to that seen in local merger-driven (U)LIRGsrather than in extended disk galaxies at low and high redshifts. The discovery of compact starbursts in z >~ 3 SMGs strongly supports a massive galaxy formation scenario wherein z ~ 3-6 SMGs evolve into the compact stellar components of z ~ 2 cQGs. These cQGs are then thought to evolve into the most massive ellipticals in the local Universe, mostly via dry mergers. Our results thus suggest that z >~ 3 SMGs are the likely progenitors of massive local ellipticals, via cQGs, meaning that we can now trace the evolutionary path of the most massive galaxies over a period encompassing ~ 90% of the age of the Universe.
Selective Chemical Labeling of Proteins with Small Fluorescent Molecules Based on Metal-Chelation Methodology
Nobuaki Soh
Sensors , 2008, DOI: 10.3390/s8021004
Abstract: Site-specific chemical labeling utilizing small fluorescent molecules is apowerful and attractive technique for in vivo and in vitro analysis of cellular proteins,which can circumvent some problems in genetic encoding labeling by large fluorescentproteins. In particular, affinity labeling based on metal-chelation, advantageous due to thehigh selectivity/simplicity and the small tag-size, is promising, as well as enzymaticcovalent labeling, thereby a variety of novel methods have been studied in recent years.This review describes the advances in chemical labeling of proteins, especially highlightingthe metal-chelation methodology.
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