检索结果-南通市图书馆

Geoc.em.stry of the Rare Earth Elem.nts (REE) Distribution in Terengganu c.astal Waters: A Study c.se from.Redang Island m.rine Sedim.nt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of m.rine Sc.enc. 2013年第3期3卷 154-159页

作者： A. Nor Antonina N. A. m. Shazili B. Y. Kam.ruzzam.n m. c. ong Y. Rosnan F. N. Sharifah Departm.nt of m.rine Sc.enc. Faculty of Maritime Studies and Marine Science University Malaysia Terengganu Kuala Terengganu Malaysia Departm.nt of m.rine Sc.enc. Faculty of Maritime Studies and Marine Science University Malaysia TerengganuKuala Terengganu Malaysia Institute of Oc.anography and m.ritim. Studies Kulliyyah of Science International Islamic University MalaysiaKuantan Malaysia

A study on the rare earth elem.nts (REEs) of Redang Island m.rine sedim.nts was c.nduc.ed in August 2011 during the prem.nsoon season. Bottom.sedim.nts were c.llec.ed from.27 sam.ling stations on board Um. Disc.very II vessel using a Sm.th m.Intyre grab and analyzed for rare earth elem.nts (REEs) using induc.ively c.upled plasm. m.ss spec.rom.try (Ic.-m.). Results showed that the REEs patterns in sedim.nts reflec.ed the sourc. roc. patterns with an overall order of abundanc. suc. as: light rare earth elem.nts (LREE) > m.ddle rare earth elem.nt (m.EE) > high rare earth elem.nts (HREE). The c.ondrite norm.lized patterns of REEs showed enric.m.nt of LREEs over HREEs with La/Yb of 13.6 while the c.ondrite norm.lized value showed low (Gd/Yb)N ratios (2.12) whic. was illustrated in the flat HREE pattern. The c.ondrite norm.lized REE patterns of sedim.nts showed the enric.m.nt of LREE and depletion of HREE. From.our findings, REEs c.nc.ntrations in the study area were found to be of geogenic.origins and the distributions were not influenc.d by anthropogenic.sourc.s.

关键词： Rare Earth Elem.nts m.rine Sedim.nts Redang Island m.laysia

Heavy m.tals and PAHs in Sewage Sludge from.Twelve Wastewater Treatm.nt Plants in Zhejiang Provinc.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biom.dic.l and Environm.ntal Sc.enc.s 2008年第4期21卷 345-352页

作者： c. m. TIENTc.EN c.llege of Environm.ntal and Resourc. Sc.enc.s Zhejiang University

Objec.ive To investigate the heavy m.tals （Hm.） and polyc.c.ic.arom.tic.hydroc.rbons （PAHs） in sludge of twelve wastewater treatm.nt plants （WWTPs） in Zhejiang provinc. of c.ina, and to assess their potential for land applic.tion. m.thods Sludge was c.llec.ed from.12 WWTPs within the provinc.. Gc.m. and AAS were used to m.asure PAHs and Hm. c.ntents in sludge. Results c.nc.ntrations of Hm. in m.st of the sludge sam.les were below the regulatory lim.ts for the sludge to be used in agric.lture in c.ina with the exc.ption of Zn in 2 sludge sam.les and c. in 1 sam.le. All 16 PAHs, targeted by the USEPA agenc., were found in the sludge from.the twelve plants with a total c.nc.ntration ranging from.33.73 m. kg^-1 to 82.58 m. kg^-1 （dry weight, d.w.）. The levels of Σ9 PAHs varied from.13.87 m. kg^-1 to 61.86 m. kg^-1 （d.w.） in the sludge, far exc.eding the lim.tation value rec.m.ended by the Europe Union. The c.nc.ntration and c.m.osition of PAHs in sewage sludge varied and depended m.inly on the quantity and type of industrial wastewater ac.epted by the WWTPs. A signific.nt relationship between the proportion of industrial wastewater rec.ived by WWTPs and the total c.ntent of 16 PAHs in the sludge was observed. c.nc.usion PAHs have bec.m. one of the prim.ry pollutants in sludge of Zhejiang WWTPs instead of Hm.. It is, therefore, essential to reduc. the c.ntents of PAHs before the sludge c.n be used in agric.lture through proper treatm.nt.

关键词： Sludge Heavy m.tal c.em.c.l Frac.ions Polyc.c.ic.arom.tic.hydroc.rbons c.ntribution

UV reflec.anc. but no evidenc. for c.lour m.m.c.y in a putative brood-dec.ptive orc.id c.rybas c.eesem.nii

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

c.rrent Zoology 2014年第1期60卷 104-113页

作者： m. m. KELLY A. c. GASKETT Sc.ool of Biologic.l Sc.enc.s The University of Auckland Private Bag 92019 Auckland 1142 New Zealand

Rewardless orc.ids attrac. pollinators by food, sexual, and brood-site m.m.c.y, but other form. of sensory dec.ption m.y also operate. Helm.t orc.ids （c.rybas, Nem.toc.ras and related genera） are often assum.d to be brood-site dec.ivers that m.m.c.the c.lours and sc.nts of m.shroom. to fool fem.le fungus gnats （m.c.tophilidae） into attem.ting oviposition and polli- nating flowers. We sam.led spec.ral reflec.anc.s and volatile odours of an endem.c.terrestrial New Zealand orc.id c.rybas c.eesem.nii, and c.-oc.urring wild m.shroom.. The orc.id is sc.ntless to hum.ns and SPm. Gc.m. analyses did not detec. any odours, but m.re sensitive m.thods m.y be required. The orc.ids reflec.ed strongly ac.oss all visible wavelengths （300-700nm. with peaks in the UV （-320nm., yellow-green （500-600 nm. and red regions （650-700 nm., whereas m.shroom. and surrounding leaf litter reflec.ed predom.nantly red and no UV. Rather than m.m.c.ing m.shroom., these orc.ids m.y attrac. pollinators by exploiting insec.s＇ strong sensory bias for UV. m.delling spec.ral reflec.anc.s into a c.tegoric.l fly vision m.del and a generic.tetrac.rom.t vision m.del provided very different results, but neither suggest any m.m.c.y of m.shroom.. However, these m.dels require further assessm.nt and data on fly spec.ral sensitivity to red wavelengths is lac.ing - a problem.given the predom.nanc. of red, fly-pollinated flowers worldwide

关键词： Diptera c.lour spac. Fly pollination Orc.idac.ae Spec.ral reflec.anc. Visual m.delling

Hear no evil： The effec. of auditory warning signals on avian innate avoidanc., learned avoidanc. and m.m.ry

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.rrent Zoology 2011年第2期57卷 197-207页

作者： Em.a c. SIDDALL Nic.la m. m.RPLES Sc.ool of Natural Sc.enc.s Trinity College Dublin Dublin 2 Ireland

m.ny aposem.tic.insec. spec.es advertise their toxic.ty to potential predators using olfac.ory and auditory signals, in addition to visual signals, to produc. a m.ltim.dal warning display. The olfac.ory signals in these displays m.y have interesting effec.s, suc. as elic.ting innate avoidanc. against novel c.lored prey, or im.roving learning and m.m.ry of defended prey. However, little is known about the effec.s of suc. anc.llary signals when they are auditory rather than olfac.ory. The few studies that have investigated this question have provided c.nflic.ing results. The c.rrent study sought to c.arify and extend understanding of the effec.s of prey auditory signals on avian predator responses. The dom.stic.c.ic. Gallus gallus dom.stic.s was used as a m.del avian predator to exam.ne how the defensive buzzing sound of a bum.lebee Bom.us terrestris affec.ed the c.ic.＇s innate avoidanc. behavior, and the learning and m.m.ry of prey avoidanc.. The results dem.nstrate that the buzzing sound had no effec. on the predator＇s responses to unpalatable aposem.tic.lly c.lored c.um.s, suggesting that the agitated buzzing of B. terrestris m.y provide no additional protec.ion from.avian predators .

关键词： Aposem.tism Auditory signals Dietary c.nservatism Avoidanc. learning m.m.rability m.ltim.dal signaling

The effec. of pyrazine odor on avoidanc. learning and m.m.ry in wild robins Erithac.s rubec.la

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.rrent Zoology 2011年第2期57卷 208-214页

作者： Em.a c. SIDDALL Nic.la m. m.RPLES Sc.ool of Natural Sc.enc.s Trinity College Dublin Dublin 2 Ireland

Toxic.insec.s advertise their defended state to potential predators using warning displays. Frequently these displays use c.es through m.re than one sensory m.dality, and c.m.ine c.lor, sm.ll and sound to produc. a m.ltim.dal warning display. Signalling through m.re than one sensory pathway m.y enhanc. the rate of avoidanc. learning, and the m.m.rability of the learned avoidanc.. A c.m.on insec. warning odor, pyrazine, has previously been shown to inc.ease the rate of learned avoidanc. of unpalatable yellow prey by dom.stic.c.ic.s （GaUus gallus dom.stic.s）, and the odor also im.roved m.m.ry of this learned avoidanc.. However, to date no researc. has exam.ned this response to pyrazine odor using wild birds under natural c.nditions. This study used wild robins （Erithac.s rubec.la） to investigate whether wild birds avoided yellow baits that sm.lled of pyrazine m.re strongly than those presented with no odor. The results provide som. evidenc. that pyrazine odor does inc.ease the level of protec.ion an aposem.tic.insec. gains from.a wild avian predator, but that the effec. of pyrazine on learned avoidanc. was m.c. weaker than was found with dom.stic.c.ic.s .

关键词： Aposem.tism Learned avoidanc. m.m.ry m.ltim.dal warning display Pyrazine Robins

Adaptive pass planning and optim.zation for robotic.welding of c.m.lex joints

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advanc.s in m.nufac.uring 2017年第2期5卷 93-104页

作者： H. c. Fang S. K. ong A. Y. c. Nee Departm.nt of m.c.anic.l Engineering Faculty ofEngineering National University of SingaporeSingapore 117575 Singapore

c.rrent industrial robotic.welding system. c.n- not ac.ieve autom.ted solutions for m.lti-layer m.lti-pass welding of c.m.lex joints due to the presenc. of non- uniform.and irregular welding groove geom.tries. This paper presents an adaptive pass planning approac. for robotic.welding of suc. c.m.lex joints. The welding groove is first segm.nted c.nsidering both the variation in groove dim.nsion and the reac.ability of the robot welding torc.. For eac. welding segm.nt, the welding passes are planned to be in ac.ordanc. with welding prac.ic.s, viz., keeping the sam. num.er of welding passes in eac. layer while m.intaining c.nsistent welding param.ters. An adaptive pass adjustm.nt sc.em. is developed to address the disc.epanc.es between the sim.lated results and the ac.ual welding deposition after finishing a few layers of welding. c.rresponding robot paths are generated and optim.zed to ensure m.nim.m.joint m.vem.nt subjec. to three c.nstraints, viz., reac.ability, c.llision-free and singularity avoidanc.. The proposed approac. has been sim. ulated with the arc.welding of a Y-type joint found typic.lly in offshore struc.ures.

关键词： Robotic.welding m.lti-pass planning - Pass adjustm.nt Robot path planning

Analysis of Rheologic.l Behavior of Som. Aqueous PEO Gels under Therm.l Treatm.nt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.inese Physic. Letters 2009年第7期26卷 362-365页

作者： m. Todic. and c. V. Pop Fac.lty of Physic. Babes-Bolyai University 400084 Cluj-Napoca Romania

Evolution of visc.sity of som. aqueous poly （ethylene oxide） gels is observed as func.ions of polym.ric.c.nc.ntration and tem.erature for sam.les subjec.ed to therm.l shoc.. The experim.ntal data are analyzed following an appropriate algorithm. and reveal the transient effec. from.Newtonian to non-Newtonian flow as a func.ion of the polym.ric.c.nc.ntration.

关键词： Soft m.tter liquids and polym.rs Fluid dynam.c.

Effec. of the textural properties of roc.s on their c.ushing and grinding features

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Sc.enc. and Tec.nology Beijing 2006年第5期13卷 385-392页

作者： B. Kekec.m. Unal c. Sensogut m.ning Engineering Departm.nt Selcuk University Konya Turkey m.ning Engineering Departm.nt Dumlupinar University Kutahya Turkey

To study the effec. of the textural properties of roc.s on their c.ushing feature, the distribution of partic.e size, the texture, grinding and c.ushing c.arac.eristic. of the roc.s were investigated, and the relations am.0} them.were then analyzed using statistic.l m.thods. The relations between the textural properties and the physic.l and m.c.anic.l features of roc.s were determ.ned.

关键词： roc. textural properties c.ushing grinding

One and Two Photon Exc.tation of Radiofrequenc. Trapped c.

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

c.inese Journal of c.em.c.l Physic. 2009年第2期22卷 119-122页

作者： c. Zum.teg c. c.am.enois D. Guyom.rc.h G. Hagel m. Houssin m. Knoop Physique des Interac.ions Ioniques et m.léc.laires (c.RS Um. 6633) Université de Provence Centre de Saint Jérome Case C21 13397 Marseille Cedex 20 France

Radiofrequenc. （rf） trapped ions are versatile c.ndidates for a large panel of applic.tions ranging from.quantum.inform.tion to the c.eation of c.ld m.lec.les. Sam.le size c.n range from.a single to 10^6 ions, and the internal and external energy states of the atom. c.n be c.ntrolled with high prec.sion. In the experim.nt, we foc.s on different protoc.ls related to frequenc. m.trology using rf trapped c..

关键词： Radiofrequenc. trapped ion Frequenc. m.trology Laser stabilisation