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On selection and scaling of gr.und motions for.analysis of seismically isolated str.ctur.s

Ear.hquake Engineer.ng and Engineer.ng Vibr.tion 2016年第4期15卷 633-648页

作者： Deepak r. Pant Manika Mahar.an Depar.ment of Civil Engineer.ng University of Toronto Toronto ON M5S 1A4 Canada Atkins Limited The Wells Church Street Epsom KT17 4PE United Kingdom

A br.ader.consensus on the number.of gr.und motions to be used and the method of scaling to be adopted for.nonlinear.r.sponse histor. analysis （r.A） of str.ctur.s is yet to be r.ached. Ther.for., in this study, the effects of selection and scaling of gr.und motions on the r.sponse of seismically isolated str.ctur.s, which ar. r.utinely designed using nonlinear.r.A, ar. investigated. For.this pur.ose, isolation systems with a r.nge of pr.per.ies subjected to bidir.ctional excitation ar. consider.d. Benchmar. r.sponse of the isolation systems is established using lar.e sets of unscaled gr.und motions systematically categor.zed into pulse-like, non-pulse-like, and mixed set of motions. Differ.nt subsets of seven to 14 gr.und motions ar. selected fr.m these lar.e sets using （a） r.ndom selection and （b） selection based on the best match of the shape of the r.sponse spectr.m of gr.und motions to the tar.et spectr.m. Consequences of weighted scaling （also commonly r.fer.ed to as amplitude scaling or.linear.scaling） as well as spectr.l matching ar. investigated. The gr.und motion selection and scaling pr.cedur.s ar. evaluated fr.m the viewpoint of their.accur.cy, efficiency, and consistency in pr.dicting the benchmar. r.sponse. It is confir.ed that seven time histor.es ar. sufficient for.a r.liable pr.diction of isolation system displacement demands, for.all gr.und motion subsets, selection and scaling pr.cedur.s, and isolation systems consider.d. If gr.und motions ar. selected based on their.best match to the shape of the tar.et r.sponse spectr.m （which should be pr.fer.ed over.r.ndomly selected motions）, weighted scaling should be used if pulse-like motions ar. consider.d, either.of weighted scaling or.spectr.l matching can be used if non-pulse-like motions ar. consider.d, and an aver.ge of r.sponses fr.m weighted-scaled and spectr.m-matched gr.und motions should be used for.a mixed set of motions. On the other.hand, the impor.ance of r.ndomly selected motions in r.pr.sen

关键词： bidir.ctional excitation seismic isolation selection and scaling spectr.l matching weighted scaling

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The Consider.tion of Over.apping Lines in the Calculation of r.diative Power.Emitted fr.m CH_4 Ther.al Plasma

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Plasma Science and Technology 2012年第12期14卷 1073-1078页

作者： r. BENALLAL B. LIANI Theor.tical Physics Labor.tor. Abou Bekr Belkaid University cole pr.par.toir. des Sciences et Techniques

Net emission coefficients of r.diation wer. calculated for.isother.al plasma of methane as a function of the plasma temper.tur. 5,000 - 30,000 K and the ar. r.dius 0 mm to 10 mm at atmospher.c pr.ssur.. Calculations take into account continuum and line r.diations, special attention has also been given to the influence of over.apping spectr.l lines. The line shapes in our.calculations ar. given by convolution of Doppler.and Lor.ntz pr.files, r.sulting in a simplified Voigt pr.file. In the case of a hydr.gen pr.file, we used the Vidal tables, and the four.fir.t Lyman lines and the four.fir.t Balmer.lines wer. consider.d. This calculation was car.ied out on the assumption of local ther.odynamic equilibr.um and in a nondiffusive envir.nment. The net emission coefficient calculation for.pur. ar.on plasma was compar.d with the exper.mental r.sults of Evans in our.pr.vious wor.. We used the escape factor. and our.r.sults wer. higher.than those of the exper.ment. In this paper. we explain why, using the escape factor. the r.diation is over.stimated. The net emission coefficient obtained fr.m a r.al spectr.m was compar.d with Essoltani wor.＇s which used the line-by-line method for.pur. ar.on plasma.

关键词： ther.al plasma r.diation net emission coefficient absor.tion coefficient

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Effects of the plenum chamber.volume and distr.butor.geometr. on fluidized bed hydr.dynamics

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Par.icuology 2010年第1期8卷 2-12页

作者： Kiar.sh Vakhshour. John r. Gr.ce Depar.ment of Chemical and Biological Engineer.ng University of British Columbia

Most hydr.dynamic fluidized bed models, including CFD codes, neglect any effects of the plenum chamber.volume. Exper.ments wer. per.or.ed in a 0.13 m ID fluidization column to deter.ine plenum chamber.volume effects on fluidized bed hydr.dynamics for.FCC and glass par.icles. Two low-pr.ssur.-dr.p distr.butor. wer. used, one with a single or.fice, and the other.with 33 or.fices and the same total open ar.a as the single or.fice. The r.sults show two peaks in the fr.quency spectr. for.the single-or.fice distr.butor. one r.pr.senting bubble er.ption at the bed sur.ace and the other.of higher.fr.quency cor.esponding to the bubbling fr.quency at the distr.butor. The latter.decr.ased slightly with incr.asing plenum volume and with incr.asing bed depth. For.the multi-or.fice distr.butor. br.ad fr.quency spectr. fr.m pr.ssur. measur.ments became nar.ower.and moved towar.s higher.fr.quency with decr.asing plenum volume.

关键词： Fluidization Bubble Distr.butor.Plenum chamber.Hydr.dynamics Pr.ssur. dr.p

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Bistability in a Hybr.d Optomechanical System under.the Effect of a Nonlinear.Medium

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Chinese Physics Letter. 2017年第8期34卷 71-75页

作者： A. Asghar. Nejad H. r. Askar. H. r. Baghshahi Depar.ment of Physics Faculty of Science Vali-e-Asr University of Rafsanjan Rafsanjan 77176 Iran

We investigate a hybr.d optomechanical system consisting of two coupled cavities, one of them is composed of two-end fixed mir.or. （called the tr.ditional cavity）, and the other.has a one-end oscillating mir.or.（named as the optomechanical cavity）. A Ker. medium is inside the tr.ditional cavity to enhance the nonlinear.ty due to the fact that it can cause obser.ing of bistable behavior.in intr.cavity intensity for.the optomechanical cavity. The Hamiltonian of the system is wr.tten in a r.tating fr.me and its dynamics is descr.bed by quantum Langevin equations of motion. Our.pr.posed system exhibits unconventional plots for.the mean photon number.of the optomechanical cavity which ar. not obser.ed in pr.vious wor.s. The pr.sent r.sults show a deep effect of the Ker. medium on optical bistability of intr.cavity intensity for.the optomechanical cavity. Also, coupling str.ngth of the cavities can effectively change the stability of the system.

关键词： Bistability in a Hybr.d Optomechanical System under.the Effect of a Nonlinear.Medium

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Misconceptions in global r.actions and for.ula wr.ting

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Defence Technology（防务技术） 2016年第5期12卷 419-421页

作者： Stig r. JOHANSSON The Swedish Section for.Detonics and Combustion Sweden

The fr.quently used concept of "global r.action" is discussed and the r.ason for.the confusion behind explained. The misconception is clear.d by for.ula wr.ting based on the donor.acceptor.donac) r.action concept and... 详细信息

关键词： Global r.action Donac r.actions For.ula wr.ting Pyr.technics Chlor.te manufactur.

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Pr.diction of blast-induced gr.und vibr.tions via genetic pr.gr.mming

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Inter.ational Jour.al of Mining Science and Technology 2015年第6期25卷 1011-1015页

作者： Dindar.oo Saeid r. Depar.ment of Mining & Nuclear.Engineer.ng Missouri University of Science & Technology

Excessive gr.und vibr.tions, due to blasting, can cause sever. damages to the near.y ar.a. Hence, the blast-induced gr.und vibr.tion pr.diction is an essential tool for.both evaluating and contr.lling the adver.e consequences of blasting. Since ther. ar. sever.l effective var.ables on gr.und vibr.tions that have highly nonlinear.inter.ctions, no compr.hensive model of the blast-induced vibr.tions ar. available. In this study, the genetic expr.ssion pr.gr.mming technique was employed for.pr.diction of the fr.quency of the adjacent gr.und vibr.tions. Nine input var.ables wer. used for.pr.diction of the vibr.tion fr.quencies at differ.nt distances fr.m the blasting face. A high coefficient of deter.ination with low mean absolute per.entage er.or.MAPE) was achieved that demonstr.ted the suitability of the algor.thm in this case. The pr.posed model outper.or.ed an ar.ificial neur.l networ. model that was pr.posed by other.author. for.the same dataset.

关键词： BlastingGr.und vibr.tionGenetic pr.gr.mmingAr.ificial neur.l networ.s

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Phase Diagr.m of Na2S2O3＋t-Butanol ＋Water.at Ambient Pr.ssur. and Temper.tur.

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Chinese Jour.al of Chemistr. 2011年第11期29卷 2562-2564页

作者： Sabale, Sandip r. School of LiJe Sciences Shanghai University Shanghai 200444 China Depar.ment of Chemistr. Jaysingpur College Jaysingpur 416101 （MS） lndia

In the pr.sent wor., we r.por. the studies concer.ing liquid-liquid-solid equilibr.a for.the ter.ar. system sodium thiosulphate （Na2S203）＋t-butanol＋water.at ambient pr.ssur. and at r.om temper.tur. （303±2 K）. The solubility data of Na2S203 ar. r.por.ed for.solutions in water. t-butanol and solutions of var.ing concentr.tions of t-butanol in water. The phase diagr.m for.the said system is developed, descr.bed and compar.d with similar.systems studied such as Na2S2O3＋ethanol＋water. K2CO3＋methanol＋water. etc. These r.sults have been explained in ter.s of str.ctur.l pr.per.ies of aqueous t-butanol solutions and fur.her.discussed in ter.s of the effect of ions to cause phase separ.tion.

关键词： sodium thiosulphate t-butanol water phase equillibr.a

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Soil Micr.bes and Sustainable Agr.cultur.

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Pedospher. 2018年第2期28卷 167-169页

作者： Ber.ar. r. GLICK Univer.ity of Water.oo Waterloo Ontario N2l 3G1 (Canada)

It has been estimated that a typical gr.m of soilcontains ar.und 90 100 million bacter.a and about200 000 fungi, with the major.ty of these or.anismsbeing located ar.und the r.ots of plants. This locali-zation r.flects the fact that plant r.ots typically exudea lar.e fr.ction of the car.on that they fix by photo-synthesis, and soil micr.bes utilize this exuded car.onas a food sour.e.

关键词： Soil Micr.bes Sustainable Agr.cultur. plant r.ots food sour.e

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In the Light of Day： Plant Photomor.hogenesis

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Molecular.Plant 2008年第1期1卷 2-3页

作者： Winslow r. Br.ggs

It takes only the most cur.or. glance over.the tables of contents of the top jour.als in plant biology to r.cognize that plant biology r.sear.h in China is not only of the highest caliber. but is gr.wing r.pidly. Suppor. for.plant science in China is gener.us and is incr.asing, and Chinese plant biologists have joined those fr.m other.countr.es in pr.ducing some of the most exciting and innovative r.sear.h. When I was given an oppor.unity to par.icipate in the launching of a new English-language jour.al,

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Simulating cyclotr.n-Bloch dynamics of a char.ed par.icle in a 2D lattice by means of cold atoms in dr.ven quasi-lD optical lattices

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Fr.ntier. of physics 2012年第1期7卷 3-7页

作者： Kolovsky, Andr.y r. Kir.nsky Institute of Physics Siberian Branch of Russian Academy of Sciences Krasnoyarsk Russia Institute of Engineer.ng Physics Siberian Federal University Krasnoyarsk Russia

Quantum dynamics of a char.ed par.icle in a two-dimensional （2D） lattice subject to magnetic and electr.c fields is a r.ther.complicated inter.lay between cyclotr.n oscillations （the case of vanishing electr.c field） and Bloch oscillations （zer. magnetic field）, details of which has not yet been com- pletely under.tood. In the pr.sent wor. we suggest to study this pr.blem by using cold atoms in optical lattices. We intr.duce a one-dimensional （1D） model which can be easily r.alized in labor.- tor. exper.ments with quasi-lD optical lattices and show that this model captur.s many featur.s of the cyclotr.n-Bloch dynamics of the quantum par.icle in 2D squar. lattices.

关键词： optical lattice Bloch dynamics cyclotr.n oscillations cold atoms

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