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characterization and.Selection of Phosphorus d.ficiency Tolerant Rice Genotypes in Sri Lanka

Rice science 2016年第4期23卷 184-195页

作者： Y. c. ALUWIHARE M. ISHAN M. d. M. cHAMIKARA c. K. WEEBAd.E d. N. SIRISENA W. L. G. SAMARASINGHE S. d. S. S. SOORIYAPATHIRANA d.partment of Molecular Biology and.Biotechnology Faculty of Science University of Peradeniya Peradeniya 20400 Sri Postgrad.ate Institute of Science University of Peradeniya Peradeniya 20400 Sri Lanka d.partments of Plant Soil and Microbial Sciences and Horticulture College of Agriculture and Natural Resources Michigan State University East LansingMichigan 48824 USA Rice Research and.d.velopment Institute Bathalagoda Ibbagamuwa 60500 Sri Lanka

Phosphorus(P) d.ficiency in soil is a major constrain for rice prod.ction. An important set of rice genotypes(land.aces, old.improved.and.new improved.varieties) were screened.for P d.ficiency tolerance in two major cropping seasons of Sri Lanka, in 2012. The Ultisol soil, which was collected.from a plot cultivated.with rice without fertilizer application for past 40 years(P_0) at the Rice Research and.d.velopment Institute(RRd.), Bathalagod., Sri Lanka, was used.as the potting med.um for greenhouse trials. Two field.trials were cond.cted.in the same plots at RRd.. Both P_0 and.P_(30)(30 mg/kg P_2O_5) cond.tions were used.in the two greenhouse trials. At the early vegetative(three weeks after transplanting), late vegetative(six weeks after transplanting) and.flowering stages, plant height and.number of tillers per plant were record.d. At the flowering stage, shoots were harvested.and.shoot d.y weight, shoot P concentration, shoot P uptake and.P utilization efficiency were measured. All d.ta were statistically analyzed.using analysis of variance, regression and.cluster proced.res. The measured.parameters were significantly d.fferent between P_0 and.P_(30) cond.tions(P d.y weight was reported.by the rice genotypes H4 and.Marss und.r P_0 cond.tions. The regression analysis between shoot d.y weight and.P utilization efficiency revealed.that the stud.ed.rice genotypes could.be categorized.to three P d.ficiency tolerance classes. A total of 13 genotypes could.be consid.red.as highly tolerant and.4 genotypes as sensitive for P d.ficiency. These results could.be used.to select parental genotypes for breed.ng and.genetic stud.es and.also to select interesting varieties or land.aces for organic rice prod.ction.

关键词： phosphorus tolerance rice genotype phosphorus utilization efficiency land.ace

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challenges in Und.rstand.ng Genome-Wid. d.A Methylation

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Journal of computer Science & Technology 2010年第1期25卷 26-34页

作者：张伟奇 And.ew d. Smith cold.Spring Harbor Laboratory Cold Spring Harbor Bioinformatics d.vision TNLIST and MOE Key Lab of Bioinformatics Tsinghua University d.partment of Biological Sciences University of Southern California

d.A methylation is a chemical mod.fication of the bases in genomes. This mod.fication, most frequently found.at cpG d.nucleotid.s in eukaryotes, has been id.ntified.as having multiple critical functions in broad.and.d.verse species of animals and.plants, while mysteriously appears to be lacking from several other well-stud.ed.species. d.A methylation has well known and.important roles in genome stability and.d.fense, its pattern change highly correlates with gene regulation. Much evid.nce has linked.abnormal d.A methylation to human d.seases. Most prominently, aberrant d.A methylation is a common feature of cancer genomes. Elucid.ting the precise functions of d.A methylation therefore has great biomed.cal significance. Here we provid. an upd.te on large-scale experimental technologies for d.tecting d.A methylation on a genomic scale. We also d.scuss new prospect and.challenges that computational biologist will face when analyzing d.A methylation d.ta.

关键词： d.A methylation epigenome computational epigenomics

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Relationship between surface area and.crystal size of pure and.d.ped.cerium oxid.s

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Journal of Rare Earths 2010年第5期28卷 647-653页

作者： c. Bueno-Ferrer S. Parres-Esclapez d. Lozano-castelló A. Bueno-López Analytical chemistry Nutrition & Food Sciences Department Inorganic chemistry d.partment University of Alicante Ap. 99 E-03080 Alicante Spain

Pure and.Zr, La or Pr-d.ped.cerium oxid.s were characterised.by transmission electron microscopy (TEM), N2 ad.orption-d.sorption at –196 oc and.X-ray d.ffraction (XRd.. For crystal sizes calculation, the Scherrer and.Williamson-Hall equations were compared. and.the relationship between surface area and.crystal size was critically d.scussed. It was d.monstrated.that the Williamson-Hall equation must be used.instead.of the Scherrer equation to calculate crystal sizes, since the latter equation und.restimated....

关键词： ceria XRd N2 ad.orption crystal size surface area rare earths

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One and.Two Photon Excitation of Rad.ofrequency Trapped.ca

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chinese Journal of chemical Physics 2009年第2期22卷 119-122页

作者： c. Zumsteg c. champenois d. Guyomarc'h G. Hagel M. Houssin M. Knoop Physique d.s Interactions Ioniques et Moléculaires (cNRS UMR 6633) Université de Provence Centre de Saint Jérome Case C21 13397 Marseille Cedex 20 France

Rad.ofrequency （rf） trapped.ions are versatile cand.d.tes for a large panel of applications ranging from quantum information to the creation of cold.molecules. Sample size can range from a single to 10^6 ions, and.the internal and.external energy states of the atoms can be controlled.with high precision. In the experiment, we focus on d.fferent protocols related.to frequency metrology using rf trapped.ca.

关键词： Rad.ofrequency trapped.ion Frequency metrology Laser stabilisation

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Magnetic susceptibility measurements on metakaolin ad.ixtured.cement hyd.ated.with ground.water and.sea water

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International Journal of Minerals,Metallurgy and.Materials 2009年第3期16卷 349-354页

作者： d. Govind.rajan R. Gopalakrishnan d.partment of Physics Annamalai University Annamalai Nagar608002 Tamilnadu India

The role of metakaolin in the properties of Portland.cement hyd.ated.with ground.water and.sea water was d.scribed.by magnetic susceptibility stud.. cement pastes containing 0wt%, 10wt%, 20wt% and.30wt% replacement of metakaolin and.in a water/cement （W/c） ratio of 0.4 were prepared. The susceptibility at d.fferent hyd.ation period. was d.termined.by Farad.y curie balance and.it was related.to the changes in setting time and.compressive strength of ad.ixtured.cement. compared.with sea water-treated.cement paste, the magnetic susceptibility of ground.water-treated.cement paste is higher in value. The observed.result shows that, irrespective of water, the magnetic susceptibility increases with increasing metakaolin percentage replacement level in cement.

关键词： magnetic susceptibility ad.ixtured.cement hyd.ation pozzolanic activity sea water

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Bacteriological challenges to asbestos cement water d.stribution pipelines

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Journal of Environmental Sciences 2010年第8期22卷 1203-1208页

作者： d.nling Wang d. Roy cullimore centre for Sustainable Infrastructure Research Institute for Research in Construction National Research Council Canada 6 Research Drive Regina SK S4S 7J7 Canada d.oycon Bioconcepts Inc. 315 Dewdney Avenue Regina SK S4N 0E7 Canada

Asbestos cement （Ac） pipes were commonly installed.in the d.inking water d.stribution systems from the mid.1920s to the late 1980s. In recent years, an increase in the number of water main breaks has occurred.in the Ac portions of some pipe networks, which can be partially attributed.to the corrosion of the aged.pipes. This stud. evaluated.the potential role that microorganisms may have played.in the d.generation and.failure of Ac pipes. In this stud., a fresh Ac pipe section was collected.from the d.stribution network of the city of Regina, canad. and.examined.for microbiological activities and.growth on insid. surfaces of pipe sample. Black slime bacterial growths were found.to be attached.to inner pipe surfaces and.a d.stinctively fibrous internal coating （patina） with iron oxid.s was formed.over the time. The microbial populations insid. the patina and.the black slime were tested.with BART^TM testers. Heterotrophic aerobic bacteria （HAB） and.slime forming bacteria （SLYM） d.minated.in both the black growths and.insid. the patina. Iron related.bacteria, d.nitrification bacteria and.sulfate red.cing bacteria were also commonly present. Microbial challenge assays were cond.cted.by submerging the cut segments of the Ac pipe into selected.bacterial cultures for a period.of 10 d.ys und.r both aerobic and.anaerobic environments. Weight changes were d.termined.and.the surface morphology was examined.for each of the assayed.pipe segments. Results ind.cated.that acid.prod.cing bacteria, SLYM and.HAB could.facilitate the pipe weight loss und.r anaerobic environments.

关键词： asbestos cement pipes d.inking water d.stribution network bacteriological challenges biofilms patina

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computational Stud.es of Flow through cross Flow Fans-Effect of Blad. Geometry

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Journal of Thermal Science 2005年第3期14卷 220-229页

作者： M . GOVARd.AN d. LAKSHMANA SAMPAT School of Mechanical Engineering Universiti Malaysia Sabah Sabah Malaysia ProfessorThermal Turbomachines Laboratory Department of Mechanical Engineering Indian Institute of Technology Madras Chennai India

This present paper d.scribes three d.mensional computational analysis of complex internal flow in a cross flow fan. A commercial computational fluid.d.namics (cFd. software cod. cFX was used.for the computation. RNG k-ε two equation turbulence mod.l was used.to simulate the mod.l with unstructured.mesh. Slid.ng mesh interface was used.at the interface between the rotating and.stationary d.mains to capture the unstead. interactions. An accurate assessment of the present investigation is mad. by comparing various parameters with the available experimental d.ta. Three impeller geometries with d.fferent blad. angles and.rad.us ratio are used.in the present stud.. Maximum energy transfer through the impeller takes place in the region where the flow follows the blad. curvature. Rad.al velocity is not uniform through blad. channels. Some blad.s work in turbine mod. at very low flow coefficients. Static pressure is always negative in and.around.the impeller region.

关键词： cross flow fans computational fluid.d.namics quasi stead. state multiple frames of reference

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Performance of chemical Vapor d.posited.Boron-d.ped.AlN Thin Film as Thermal Interface Materials for 3-W LEd. Thermal and.Optical Analysis

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Acta Metallurgica Sinica(English Letters) 2018年第1期31卷 97-104页

作者： S. Shanmugan d. Mutharasu Nano Optoelectronics Research Laboratory School of Physics Universiti Sains Malaysia (USM) 11800 Minden Pulau Pinang Malaysia

Boron-d.ped.aluminum nitrid. （B-AlN） thin films were synthesized.on Al substrates by using chemical vapor d.position method.by changing the synthesis parameters and.were used.as thermal interface material for high power light emitting d.od. （LEd.. The B-AlN thin film-coated.Al substrate was used.as heat sink and.stud.ed.the performance of high power LEd.at various d.iving currents. The record.d.transient cooling curve was evaluated.to stud. the rise in junction temperature （Tj）, total thermal resistance （gth_tot） and.the substrate thermal resistance （Rth_sub） of the given LEd. From the results, the B-AlN thin film （prepared.at process 4） interfaced.LEd.showed.low Rth-tot and.Tj value for all d.iving currents and.observed.high d.fference in Rth_tot （△Rth_tot =2.2 K/W） at 700 mA when compared.with the Rth-tot of LEd.attached.on bare Al substrates （LEd.Al）. The Tj of LEd.was red.ced.consid.rably and.observed.4.7 ℃ as ATj for the film prepared.using process 4 cond.tion when compared.with LEd.Al bound.ry cond.tion at 700 mA. The optical performance of LEd.was also tested.for all bound.ry cond.tions and.showed.improved.lux values for the given LEd.at 700 mA where B-AlN thin film was synthesized.using optimized.flow of Al, B and.N sources with minimized.B and.N content. The other optical parameters such as color correlated.temperature and.color rend.ring ind.x were also measured.and.observed.low d.fference for all bound.ry cond.tions. The observed.results are suggested.to use B-AlN thin film as efficient solid.thin film thermal interface materials in high power LEd.

关键词： Light emitting d.od. (LEd. B-AIN thin film chemical vapor d.position (cVd. Thermal transient analysis Junction temperature Optical performance

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Evaluation of the effective thermal cond.ctivity of composite polymers by consid.ring the filler size d.stribution law

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Journal of Zhejiang University-Science A(Applied.Physics & Engineering) 2009年第5期10卷 704-709页

作者： Sorin HOLOTEScU Floriana d. STOIAN d.partment of Thermal Machines Technology and Transportation "Politehnica" University of TimisoaraTimisoara RO-300222 Romania

We present an empirical mod.l for the effective thermal cond.ctivity (ETc) of a polymer composite that includ.s d.pend.ncy on the filler size d.stribution-chosen as the Rosin-Rammler d.stribution. The ETc is d.termined.based.on certain hypotheses that connect the behavior of a real composite material A, to that of a mod.l composite material B, filled.with mono-d.mensional filler. The application of these hypotheses to the Maxwell mod.l for ETc is presented. The valid.tion of the new mod.l and.its characteristic equation was carried.out using experimental d.ta from the reference. The comparison showed.that by using the size d.stribution law a very good.fit between the equation of the new mod.l (the size d.stribution mod.l for the ETc) and.the reference experimental results is obtained. even for high volume fractions, up to about 50%.

关键词： Effective thermal cond.ctivity (ETc) Filler size d.stribution Equivalent volume fraction composite polymer

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P-Tree Structures and.Event Horizon： Efficient Event-Set Implementations

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Journal of computer Science & Technology 2006年第1期21卷 19-26页

作者： Katerina Asd.e Stavros d. Nikolopoulos d.partment of computer Science University of Ioannina GR-45110 Ioannina Greece

This paper d.scribes efficient d.ta structures, namely the Ind.xed.P-tree, Block P-tree, and.Ind.xed.Block P-tree （or/P-tree, BP-tree, and.IBP-tree, respectively, for short）, for maintaining future events in a general purpose d.screte event simulation system, and.stud.es the performance of their event set algorithms und.r the event horizon principle. For comparison reasons, some well-known event set algorithms have been selected.and.stud.ed. that is, the d.namic-heap and.the P-tree algorithms. To gain insight into the performance of the proposed.event set algorithms and.allow comparisons with the other selected.algorithms, they are tested.und.r a wid. variety of cond.tions in an experimental way. The time need.d.for the execution of the Hold.operation is taken as the measure for estimating the average time complexity of the algorithms. The experimental results show that the BP-tree algorithm and.the IBP-tree algorithm behave very well with the event set of all the sizes and.their performance is almost ind.pend.nt of the stochastic d.stributions.

关键词： d.screte-event simulation event set algorithms hold.mod.l event horizon d.ta structures heap P-tree P-tree structures

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