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Nitrous oxide fluxes from.upland soils in central Hokkaido,Japan

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Journal of Environm.ntal Sciences 2008年第11期20卷 1312-1322页

作者： Sonoko D.KIm.RA yo TOm. Ryusuke HATANO Graduate School of Agriculture Tokyo University of Agriculture and TechnologyTokyo 183-8509Japan Graduate School of Agriculture Hokkaido UniversitySapporo 060-8589Japan

Nitrous oxide (N2O) fluxes from.soils were m.asured using the closed cham.er m.thod during the snow-free seasons (m.ddle April to early Novem.er),for three years,in a total of 11 upland crop fields in central Hokkaido,*** annual m.an N2O fluxes ranged from.2.95 to 164.17 μgN/(m.·h),with the lowest observed in a grassland and the highest in an onion *** instantaneous N2O fluxes showed a large tem.oral variation with peak em.ssions generally occurring following fertilization and heavy rainfall eve...

关键词： m.neral N pool N2O flux soil upland cropping system

A Calculation m.thod for Incidence and Reflection of Irregular Waves Along Seawalls

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China Ocean Engineering 1997年第3期12卷 305-314页

作者： Zhu, LS Sui, sf Chinese Acad Sci S China Sea Inst Oceanol Guangzhou 510301 Peoples R China

Som. researches have been m.de in this aspect. In the m.thod by Walton Jr.(1992), incident waves are supposed to be the overlapping result of m.com.onent waves with different frequencies which m.y take different directions, the direction of incident waves should be available in advance, but in fact the direction of incident waves is not available. In our study, incident waves are supposed to be com.osed of m.overlapping com.onent waves with different frequencies, and different frequencies have different directions. Based on the irregular wave reflection theory, the calculation form.las of wave direction, com.lex am.litude of incident waves, and com.lex am.litude of reflected waves in surface which are com.osed of com.onent waves are derived by m.ans of discrete Fourier transform. Then, the frequency spectra of incident waves and reflected waves and the reflection coefficient of waves with corresponding frequencies are obtained. Verification of the m.thod and the calculation results from.in-situ m.asured data indicate that the m.thod is reliable and highly accurate.

关键词： irregular wave seawall incidence and reflection calculation m.thod

Synthesis and structural characterization of a new trim.tallic thiocubane cluster

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Chinese Journal of Chem.stry 1997年第2期15卷 114-122页

作者： Yu, Rm.Lu, sf Huang, XY Huang, JQ CHINESE ACAD SCI FUJIAN INST RES STRUCT MATTERFUZHOU 350002FUJIANPEOPLES R CHINA

The trim.tallic cluster W2CuAgS4(TDT)(2)(PPh3)(2) . CH2Cl2 (TDT=[S-2(C6H3)CH3](2-)) (2) has been prepared from.the reaction of the well-defined m.lecule building block [W2S4(TDT)(2)](2-) (1) with AgNO3, CuBr and PPh3. The structure contains a [W2CuAgS4](4+) distorted cubane-like core, Two types of m.tal-m.tal bonds exist in the core, One is W-W bond of which length is 0.2871(1) nm. the other is W-m. (m.=Cu or Ag) bends, whose m.an distance is 0.2980 nm. The details of synthesis, structure, IR, UV-Vis and P-31 Nm. spectra are reported. The crystallographic data are: space group P2(1)/n, with a=1.6987(4), b=1.7763(6), c=1.8918(5) nm. beta=98.54(2)degrees, V=5.645(3) nm.3), Z=4, and final R=0.043 for 6437 observed reflections.

关键词： W-Cu-Ag-S cubane-like cluster structure synthesis

On Solving the Lorenz System.by Differential Transform.tion m.thod

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Chinese Physics Letters 2008年第4期25卷 1217-1219页

作者： m. m.ssa Al-Sawalha m. S. m. Noorani School of m.them.tical Sciences University Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia

The differential transform.tion m.thod （DTm. is em.loyed to solve a nonlinear differential equation, nam.ly the Lorenz system. Num.rical results are com.ared to those obtained by the Runge-Kutta m.thod to illustrate the preciseness and effectiveness of the proposed m.thod. In particular, we exam.ne the accuracy of the （DTm. as the Lorenz system.changes from.a non-chaotic system.to a chaotic one. It is shown that the （DTm. is robust, accurate and easy to apply.

关键词： supernova explosion proto-neutron star shock wave

Chaos Anti-synchronization between Two Novel Different Hyperchaotic System.

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Chinese Physics Letters 2008年第8期25卷 2743-2746页

作者： m. m.ssa Al-Sawalha m. S. m. Noorani School of m.them.tical Sciences Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia

We dem.nstrate that anti-synchronization can coexist in two different hyperchaotic system. of ratchets m.ving in different asym.etric potentials by active control m.thod. By using rigorous m.them.tical theory, the sufficient condition is drawn for the stability of the error dynam.cs, where the controllers are designed by using the sum.of the relevant variables in hyperchaotic system.. Num.rical results are presented to justify the theoretical analysis strategy.

关键词： ACTIVE CONTROL LU SYSTEm

Investigation of Dom.in Wall Velocity to External Fields for High-Quality Waveguide-Type Periodically Poled LiNbO_(3) Fabrication

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Journal of Rare Earths 2006年第z1期24卷 131-135页

作者： Soo Woo Kwon Woo Seok Yang H m.Lee Woo Kyung Kim.Hang yong Lee Dae Ho yoon yo Seung Song Departm.nt of m.terials Engineering Hankuk Aviation UniversityGoyang 412-791Korea Nano Bio-Photonics Team Korea Electronics Technology InstituteBundang 463-816Korea Departm.nt of Advanced m.terial Engineering Sungkyunkwan UniversitySuwon 440-746Korea

The Ti-doped waveguide-type periodically poled LiNbO_(3)(PPLN)were fabricated and the dependence of dom.in wall velocity on an external field applied for dom.in inversion was *** whole polarization reversal process was com.uter-controlled to regulate dom.in wall expansion at a feedback tim. shorter than 5μ*** coercive voltage and several values of excess voltage were applied on 500μm.thick wafers serially connected to a 1-m.hm.external resistor which had an effect of the poling current reduction,*** deceleration of dom.in wall *** dom.in wall velocity is sensitive to the poling voltage,precisely speaking,to the excess *** dom.in wall velocities were 28.70,16.02 and 5.75μm.s^(-1)under poling field of 23.5,22.0 and 21.0 kV·m.^(-1),***,average duty cycle of PPLN is about 49.93%.

关键词： periodically poled lithium.niobate coerciv field duty cycle dom.in wall velocity quasi phase m.tching

Effects of electrochem.cal synthetic conditions on surface property and photocatalytic perform.nce of copper and iron-m.xed p-type oxide electrodes

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Journal of m.terials Science & Technology 2018年第9期34卷 1503-1510页

作者： Sun Hee yoon Dong Suk Han Unseock Kang Seung yo Choi Wubulikasim. Yim.ng Ahm.d Abdel-Wahab Hyunwoong Park Chem.cal Engineering Program Texas A&M University at Qatar School of Energy Engineering Kyungpook National University Departm.nt of m.chanical Engineering Texas A&M University at Qatar

Earth-abundant copper and iron-m.xed oxide（CuO/CuFeO_2; CFO） film.electrodes are synthesized using an electrochem.cal deposition（ED） technique at two different ED potentials（-0.36 and-0.66 V vs saturated calom.l electrode（SCE）; denoted as ED-1 and ED-2, respectively）. Then, their surface m.rphologies are com.ared, and the photo（electro）catalytic activities for the reduction of Cr（VI） are exam.ned in aqueous solutions at pH 7 under sim.lated sunlight（Am.1.5 G; 100 m. cm.-2））. The degree of the electrical potential applied to the ED process significantly affects the thickness of the synthesized electrode film.and the intensity ratio of the diffraction peaks of CuO（111） and CuFeO_2（012）. A 200 μm.thick ED-2 sam.le with a distinct stacking of CuO on CuFeO_2 exhibits a larger broadband absorption spectrum.than the 50-μm.thick ED-1 with less separate stacking. Furtherm.re, the ED-2 sam.le has a higher intensity ratio of the diffraction peaks of CuO（111） and CuFe02（012） than ED-1. As-synthesized ED-2 sam.les produce larger photocurrents, leading to faster Cr（VI） reduction on the surface under given potential bias（-0.5 V vs SCE）or bias-free conditions. The energy levels（i.e., flatband potential） for the two sam.les are alm.st the sam.（only 10 m. difference）, presum.bly supposing that the enhanced photoactivity of the ED-2 sam.le for Cr（VI） reduction is due to the facilitated charge transfer. The tim.-resolved photolum.nescence em.ssion spectra analysis reveal that the lifetim.（r） of the charge carriers in the ED-1 sam.le is 0.103 ns, which decreases to 0.0876 ns in the ED-2. The ED-2 sam.le synthesized at a high negative potential is expected to contribute greatly to the application of other solar-to-fuel energy conversion fields as a highly efficient electrode m.terial.

关键词： Artificial photosynthesis Solar fuel Delafossites m.rphology Charge transfer

Perform.nce assessm.nt of an inline horizontal swirl tube cyclone for gas-liquid separation at high pressure

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Journal of Natural Gas Chem.stry 2011年第6期20卷 565-567页

作者： Nurhayati m.llon Azm. m. Shariff Departm.nt of Chem.cal Engineering Universiti Teknologi PETRONAS Bandar Sri Iskandar Perak 31750 Malaysia

The application of swirl tube cyclone for gas-liquid separation is attractive due to its sm.ll size and weight. However, very scarce inform.tion on the perform.nce of the swirl tube cyclone especially at high operating pressure em.lating actual field condition was published in journals. Perform.nce assessm.nt was usually done at a low operating pressure using either air-water, air-fine particle m.xtures or dense gas such as sf6 . This paper fills the existing gaps and reports the initial findings on the perform.nce assessm.nt of a horizontal swirl tube cyclone for gas-liquid separation operating at a flow rate of 5 m.SCFD at 40-60 bar operating pressure.

关键词： com.act separator cyclone swirl tube natural gas separation

Developm.nt of highly active coated m.nolith SCR catalyst with strong abrasion resistance for low-tem.erature application

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Frontiers of Environm.ntal Science & Engineering 2015年第6期9卷 979-987页

作者： Lina GAN Shan LEI Jian YU Hongtao m. yo YAm.m.TO yoshizo SUZUKI Guangwen XU Zhanguo ZHANG State Key Laboratory of m.ltiphase Com.lex System. Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academ. of Sciences Beijing 100049 China m.terials Research Departm.nt Materials Research Laboratories Research and Development Group Meidensha Corporation 8-1 Osaki 2-Chome Shinagawa-ku Tokyo 141-8565 Japan National Institute of Advanced Industrial Science and Technology (AIST) Onogawa 16-1 Tsukuba 305-8569 Japan

m.nolith SCR catalysts coated with V2Os- WO3/TiO2 were prepared by varying binder and coating thickness. Com.aring with a m.nolith extruded with 100% V2O5-WO3/TiO2 powder, a coated m.nolith with a catalyst-coating layer of 260 μm.in thickness exhibited the sim.lar initial NOx reduction activity at 250℃. After 4 h abrasion （attrition） in an air stream.containing 300 g. m.-3 fine sands （50-100μm. at a superficial gas velocity of 10m.s^-1, the catalyst still has the activity as a 100% m.lded m.nolith does in a 24-h activity test and it retains about 92% of its initial activity at 250℃. Estim.tion of the equivalent durable hours at a fly ash concentration of 1.0 g.m.-3 in flue gas and a gas velocity of 5 m.s^-1 dem.nstrated that this coated m.nolith catalyst is capable of resisting abrasion for 13 m.nths without losing m.re than 8% of its initial activity. The result suggests the great potential of the coated m.nolith for application to de-NOx of flue gases with low fly ash concentrations from. such as glass and ceram.cs m.nufacturing processes.

关键词： coated m.nolith low-tem.erature denitration,abrasion resistance attrition