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RISS 인기검색어
- 검색키워드
- 저자 : R. Wills (검색결과 7 건)
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Q. Mahmood,G. Murtaza,R. Ahmad,T. Hussain,I.G. Will 한국물리학회 2016 Current Applied Physics Vol.16 No.3
The structural, electronic, magnetic, mechanical and optical properties of ternary Zn1xVxS (x ¼ 0.0, 0.25, 0.50, 0.75 and 1.0) ferromagnetic semiconductor alloys have been studied in the zinc blende (ZB) phase, by first principle approach. Density functional theory has been employed to calculate the fundamental properties of the alloys using full-potential linearized augmented plane-wave plus the local orbitals (FPLAPW þ Lo) method. In addition, the electronic and magnetic properties are investigated by the local spin density approximation coupled with the modified BeckeeJohnson exchange potential (mBJLDA). Structural analysis revealed that the structure of the three alloys Zn0.75V0.25S, Zn0.50V0.50S, and Zn0.25V0.75S are stable in the ferromagnetic phase. It is noted that the calculated lattice constant decreases, while the bulk modulus increases with the increase of V content. The density of states and spin polarized band structure investigation demonstrated the half-metallic ferromagnetic characteristics of the investigated alloys and are also used to determines ped exchange constants N0a and N0b, due to S (p) eV(3d) hybridization. These results reveal that magnetic moment of V dopant element reduced from its free space value of 3 mB, because the Zn and S sites acquire minor atomic magnetic moments. The energy band gap analysis show an increasing trend with V doping that makes our compound a suitable candidate for the fabrication of devices operating in the ultraviolet region. Moreover, the static dielectric constant, ε1 (u), and static refractive index, n (u), increases with V contents. The incorporation of V generates some new peaks in the energy regions of 0e2.83 eV and 4e10 eV. The substitution by V increases the intensity of the peaks, and a slight red shift has been observed in the absorption peak. The extinction coefficient k (u) and optical conductivity also follow a similar trend to that of the dielectric constants. These results give deep insight into the design of devices for optical and spintronics applications using V doped ZnS.
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Slepian, Zachary,Eisenstein, Daniel J.,Brownstein, Joel R.,Chuang, Chia-Hsun,Gil-Marí,n, Hé,ctor,Ho, Shirley,Kitaura, Francisco-Shu,Percival, Will J.,Ross, Ashley J.,Rossi, Graziano,Seo, H Oxford University Press 2017 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.469 No.2
<P>We present the large-scale three-point correlation function (3PCF) of the Sloan Digital Sky Survey DR12 Constant stellar Mass (CMASS) sample of 777 202 Luminous Red Galaxies, the largest-ever sample used for a 3PCF or bispectrum measurement. We make the first high-significance (4.5 sigma) detection of baryon acoustic oscillations (BAO) in the 3PCF. Using these acoustic features in the 3PCF as a standard ruler, we measure the distance to z = 0.57 to 1.7 per cent precision (statistical plus systematic). We find DV = 2024 +/- 29 Mpc (stat) +/- 20 Mpc (sys) for our fiducial cosmology (consistent with Planck 2015) and bias model. This measurement extends the use of the BAO technique from the two-point correlation function (2PCF) and power spectrum to the 3PCF and opens an avenue for deriving additional cosmological distance information from future large-scale structure redshift surveys such as DESI. Our measured distance scale from the 3PCF is fairly independent from that derived from the pre-reconstruction 2PCF and is equivalent to increasing the length of BOSS by roughly 10 per cent; reconstruction appears to lower the independence of the distance measurements. Fitting a model including tidal tensor bias yields a moderate-significance (2.6 sigma) detection of this bias with a value in agreement with the prediction from local Lagrangian biasing.</P>
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Flicker Mitigation for a Grid-Connected Tidal and River Power Generator Using the BESS
S. Seo,J. Kim,E. Muljadi,S. Meor-Danial,M. Worthington,R. Wills 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the grid-connected tidal and river power generation, the water turbulence and the grid condition can induce the fluctuating output power. This power fluctuation may cause a power quality issue such as flicker, or voltage fluctuations, during the continuous operation. Hence, it is important to assess flicker emission and to mitigate flicker in order to solve this power quality issue. This paper proposes a Battery Energy Storage System (BESS) installed between the power converters of the tidal and river power system in order to mitigate flickers in different grid conditions. The BESS smooths the active power fluctuations and reduces flicker even from the weak grid with the low impedance angle in the distribution network. The feasibility of the proposed BESS system has been tested using a simplified simulation model with interconnected inverters developed in the validated simulation tool of PSCAD/EMTDC, and the obtained results from the case studies are presented.
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Movement of trifluralin , metolachlor and metribuzin in the soil environment
Kim, Jung Ho,Feagley, S E,Southwick, L M,Wills, H W,Bengtson, R L 한국농화학회 1992 Applied Biological Chemistry (Appl Biol Chem) Vol.35 No.4
The objective of this study was to evaluate the runoff behavior and leaching properties in soil environment of trifluralin, metolachlor and metribuzin: herbicides used widely in Louisiana and other states with soybeans. Adsorption-desorption of the these herbicides trifluralin, metolachlor and metribuzin was studied in a selected soil (Clay loam). At a 1: 10 soil/water ratio, the Freundlich constant Kd, for trifluralin metolachlor and metribuzin were 9.97, 1.54 and 1.10 respectively. Leaching and distribution of these herbicides were evaluated in soil columns (id 5.4㎝×26㎝). When the soil columns were leached with three pore volume of water, the distribution of trifluralin in soil and Leachate water was 70.02% and 0.005% of the applied amount respectively. The distribution of metolachlor was 42.93% in soil and 21.33% in leachate water. The distribution of metribuzin was 8.88% in soil and 68.97% in leachate water. Metolachlor and metribuzin were readily leached while trifluralin was strongly adsorbed to the soil. The results of the study illustrate the strong correlation between adsorption-desorption properties and leaching properties. From Louisiana field plot applied 1683 g/㏊ trifluralin 2759 g/㏊ of metolachlor and 609 g/㏊ of metribuzin, half life the field was 0.083∼0.052 ng/㎖. The concentration of metolachlor and metribuzin were 19∼402 ng/㎖ and 1.5∼56.2 ng/㎖ respectively. The trifluralin loss in surface water from the field was 0.0016% (0.0269 g/㏊) of the amount applied on 3 times of run off events. The total in surface water was 12.34% (340.46 g/㏊) and 7.11% (43.29 g/㏊) respectively, for the metolachlor and metribuzin on 7 times of run off events. The concentration of trifluralin in 1 m and 2 m well were the range of 0.04 ng/㎖∼0.08 ng/㎖. This indicated that leaching of trifluralin was very low. The concentration of metolachlor in 1 m well was decreased froth 205.3 ㎎/㎖ during 17∼62 days after application. The concentration of metribuzin in 1 m well also was decreased from 64.2 ng/㎖ to 0.70 ng/㎖, but in 2 m well was increased from 1.9 ng/㎖ to 76.7 ng/㎖. A contamination of metolachlor and metribuzin in ground water were higher than trifluralin.
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Lunn, David J.,Seo, Sungbaek,Lee, Sang‐,Ho,Zerdan, Raghida Bou,Mattson, Kaila M.,Treat, Nicolas J.,McGrath, Alaina J.,Gutekunst, Will R.,Lawrence, Jimmy,Abdilla, Allison,Anastasaki, Athina,Knigh John WileySons, Inc. 2019 Journal of polymer science Part A, Polymer chemist Vol.57 No.6
<P><B>ABSTRACT</B></P><P>The synthesis and systematic comparison of a comprehensive library of well‐defined polymer architectures based on poly(acrylic acid) is reported. Through the development of new synthetic methodologies, linear, single branched, precision‐branched comb, and star polymers were prepared and their performance as dispersants was evaluated. The ability to accurately control chain lengths and branch points allows the subtle interplay between structure and dispersant performance to be defined and affords critical insights into the design of improved polymeric additives for coating formulations. The general industrial relevance of ionic polymers and branched macromolecular architectures supports these design rules for a wide range of other applications and materials, including as additives for personal care products and in water treatment. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <B>2019</B>, <I>57</I>, 716–725</P>
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