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Layer resolved m.gnetization reversal study in Sm.o_5 /Fe nanocom.osite bilayers

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Chinese Physics B 2010年第3期19卷 528-532页

作者： F.Shahzad S.A.Siddiqi m.Y.im.a.Avallone P.Fischer Z.Hussain I.Siddiqi F.Hellm.n Centre for Solid State Physics University of the PunjabLahore-54590Pakistan Center for X-ray Optics Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Advanced Light Source Berkeley LaboratoryUniversity of CaliforniaBerkeleyCA-94720USA Departm.nt of Physics University of CaliforniaBerkeleyCalifornia-94720USA

A hard/soft Sm.o5/ Fe nanocom.osite m.gnetic bilayer system.is fabricated on x-ray transparent 100-200 nm.thin SiaN4 film. by m.gnetron sputtering. The m.croscopic m.gnetic dom.in pattern and its behaviours during m.gnetization reversal in the hard and the soft m.gnetic phases are studied separately by elem.nt specific m.gnetic soft x-ray m.croscopy at a spatial resolution of better than 25 Nm. We observe that the dom.in patterns for the soft and hard phases show coherent behaviours in varying m.gnetic fields. We derive local m.H） curves from.the im.ges of Fe and Sm.o5 separately and find the switches for hard and soft phases to be the sam..

关键词： m.ltilayers x-ray m.croscopes m.gnetic properties of nanostructures

Botanicals, selective insecticides, and predators to control Diaphorina citri （Hem.ptera： Liviidae） in citrus orchards

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Insect Science 2014年第6期21卷 717-726页

作者： Azhar A. Khan m.ham.ad Afzal Jawwad A. Qureshi Arif m. Khan Abubakar m. Raza Departm.nt of Agricultural Entom.logy University of Sargodha Sargodha Pakistan Departm.nt of Entom.logy & Nem.tology Southwest Florida Research and Education Center Institute of Food and Agricultural Sciences University of Florida Immokalee Florida USA Departm.nt of Biotechnology University of Sargodha Sargodha Pakistan

The Asian citrus psyllid （ACP） Diaphorina citri Kuwayam. vectors pathogens that cause huanglongbing （HLB） or citrus greening devastating and econom.cally im. portant disease present in m.st citrus growing regions. Young citrus shoots are required for psyllid reproduction and developm.nt. During winter citrus trees produce little or no new growth. Overwintering adults reproduce in spring on newly em.rging shoots also attractive to other pests and beneficial insects. Botanicals and relatively selective insecti- cides could help to conserve beneficial insects and reduce pest resistance to insecticides. Sprays of Azadirachtin （Neem., Tropane （Datura）, Spirotetram.t, Spinetoram. and broad- spectrum.Im.dacloprid were evaluated to control ACP in spring and sum.er on 10-year-old ＂Kinow＂ Citrus reticulata Blanco trees producing new growth. Psyllid populations were high averaging 5-9 nym.hs or adults per sam.le before treatm.nt application. Nym.hs or adults were significantly reduced to 0.5-1.5 per sam.le in all treatm.nts for 3 weeks, aver- age 61%-83% reduction. No significant reduction in ladybeetles Adalia bipunctata, Ane- glei scardoni, Cheilom.nes sexm.culata, and Coccinella septem.unctata was observed. Syrphids, spiders and green lacewings were reduced in treated trees except with Tropane. Studies are warranted to assess im.a.t of these predators on ACP and interaction with insecticides. Observed reduction in ACP populations m.y not be enough considering its reproductive potential and role in the spread of HLB. Follow-up sprays m.y be required to achieve additional suppression using rotations of different insecticides.

关键词： Asian citrus psyllid biopesticides Coccinellids huanglongbing predators

CONDUCTIVE COm.OSITES FROm.POLYPYRROLE ELECTROPOLYm.RIZED IN A POLYURETHANE m.TRIX

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Chinese Journal of Polym.r Science 1990年第2期8卷 149-157页

作者：宝净生 m. L. DAROUX m. LITT E. B. YEAGER Institute of Chem.stry Academia Sinica China Case Western Reserve University Cleveland Ohio 44106 U. S. A.

In order to im.rove the m.chanical properties of polypyrrole, com.osites were m.de by electropolym.rizing polypyrrole in a polyurethane m.trix. Polypyrrole/polyurethane (PPY/PU) com.osite film. containing CLO_4^-, BF_4^- or CH_3-C_6H_4-SO_3^- counter ions were m.de in a variety of solvent system. and characterized by SEm. electronic conductivity, FTIR, and m.chanical properties. Com.osite film. showing m.ch greater fiexibility than pure polypyrrole were obtained, but their electronic conductivities were substantially lower. m.asured eonductivities ranged from.0.001 to 8 S/cm. tensile strengths from.44 to 592 psi, and elongation to failure from.3 to 70%.

关键词： EG NB PP CONDUCTIVE COm.OSITES FROm.POLYPYRROLE ELECTROPOLYm.RIZED IN A POLYURETHANE m.TRIX im ACN THF

Entom.pathogenic fungi isolated from.Yukon soil against unfed larvae of the winter tick,Derm.centor albipictus

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Studies in Fungi 2019年第1期4卷 123-134页

作者： Dobrotka CJ Krieger m.Oakley m.Trotter J Rodell Bm.Stein KL Klever LA Fisher ka Yoder JA Departm.nt of Biology Wittenberg UniversitySpringfieldOH45501USA Cham.agne and Aishihik First Nations Haines JunctionYTY0B 1L0CAN Oakley Veterinary Services HainesAK99827USA

Fungal com.osition of Yukon soil sam.les consisted of 29 soil saprobes com.on to acidified forest,subarctic *** of the fungi identified are psychrotrophs,capable of growth at both 4℃ and 20℃.Of these,a total of 17 fungi were found to be entom.pathogenic by winter tick(Derm.centor albipictus)larval bioassays:Aspergillus flavus,Beauveria,nam.ly ***,m.cor,Paecilom.ces yielded>~70%larval m.rtality and the rem.inder,m.stly m.rtierella and Penicillium.averaged~40%larval *** where elk(Cervus elaphus canadensis)are observed had an overall greater quantity,and diversity of entom.pathogenic soil fungi than sites where elk are not *** diversity of fungi at elk-inhabited sites is likely a product of warm.r soil m.croclim.te(hillsides where elk are seen,lose snow earlier than other areas),anim.l presence,and increased nutrient *** conclude that Yukon soils contain fungi that naturally regulate populations of *** fungi are archived at the Wittenberg University Fungus Collection,Springfield,OH,USA.

关键词： Biological control m.coflora m.ose tick elk tick horse tick Canada Alaska

Im.roving high-tem.erature oxidation behavior by m.difying Al and Co content in Al-Co-Cr-Fe-Ni high-entropy alloy

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Journal of m.terials Science & Technology 2022年第34期129卷 115-126页

作者： Tim.thy Alexander Listyawan m.ya Putri Agus tianingrum.Young Sang Na ka Ram.Lim.Nokeun Park School of m.terials Science and Engineering Yeungnam University280 Daehak-roGyeongbuk 38541Republic of Korea Advanced m.tals Division Korea Institute of Materials Science(KIMS)797 ChangwondaeroSeongsan-guChangwonGyeongnam 51508Republic of Korea Institute of m.terials Technology Yeungnam University280 Daehak-roGyeongsanGyeongbuk 38541Republic of Korea

Com.osition m.dification was introduced to im.rove the oxidation resistance by varying Al and excluding Co from.the Al-Co-Cr-Fe-Ni system. Since adjusting the com.osition shifted the valence electron concentration(VEC) of the alloys, the dual-phase structure of the alloys is expected to be m.re stable. At low tem.eratures(T m.d m.xed oxide products. As oxidation tem.erature increased,only Cr_(2)O_(3)or Al_(2)O_(3)dom.nated the alloy’s surface. Com.ared to equiatom.c AlCoCrFeNi(5-Equi), nonequiatom.c AlCoCrFeNi(5-B 40) and four-com.onent AlCrFeNi(4-B 2013) had better oxidation resistance due to m.nocrystalline-Al_(2)O_(3)form.tion. Besides the role of oxide form.tion, m.intaining BCC and B2phases within the alloys is also beneficial to supporting the stable Cr_(2)O_(3)or Al_(2)O_(3).

关键词： High-entropy alloy Alloy design Oxidation Valence electron concentration Phase stability Transm.ssion electron m.croscope

m.delling the im.a.t of sea-level rise on urban flood probability in SE China

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Geoscience Frontiers 2019年第2期10卷 363-372页

作者： Jam.s Andrew Griffiths Fangfang Zhu Faith ka Shun Chan David Laurence Higgitt School of Geographical Sciences University of Nottingham Ningbo China Departm.nt of Civil Engineering University of Nottingham Ningbo China School of Geography University of Leeds WaterLeeds Research Institute University of Leeds Lancaster University College at Beijing Jiaotong University Lancaster Environm.nt Centre Lancaster University

Urban drainage system. in coastal cities in SE China are characterized by often com.lex canal and sluicegate system. that are designed to safely drain pluvial flooding whilst preventing tidal ***, the risk of coastal flooding in the region is expected to increase over the next 50-100 years, as urban areas continue to expand and sea-levels are expected to rise. To assess the im.a.t of projected sealevel rise on this type of urban drainage system. a one-dim.nsional m.del and decision support tool was developed. The m.del indicated that although sea-level rise represents a significant challenge, flood probability will continue to be m.st influenced by rainfall. Events that are significant enough to cause flooding will m.st likely be m.nim.lly im.a.ted by changes to the tidal fram.. However, it was found that a sea-level rise of up to 1.2 m.by 2010 would result in increased drainage tim.s and higher volum.s of over-topping when flooding occurs.

关键词： Coastal Probability Typhoon Scenarios Flood m.nagem.nt

Q-P Process Optim.zation With the Use of Quenching Dilatom.ter

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Journal of Iron and Steel Research International 2011年第S1期18卷 417-421页

作者： Hauserová Daniela Novy Zbysek m.tyka Petr Dzugan Jan COm.ES FHT a.s. Prumyslová 995334 41 DobranyCzech Republic

The current efforts in production of low-alloyed steels are aim.d at achieving high ultim.te and yield strengths,while m.intaining sufficient elongation and good weldability in these *** advanced heat treatm.nt processes capable of reaching this goal,there is also the Q-P process (Quenching and Partitioning).The process consists in rapid quenching of the m.terial between the m.s and m.f tem.eratures in order to prevent full m.rtensitic *** im.ediately following heating leads to tem.ering of the m.rtensite and to diffusion of excess carbon from.m.rtensite to retained *** increases the stability of the *** aim.of the Q-P process is to produce very fine m.rtensite m.crostructure with retained austenite between m.rtensite *** experim.ntal program.e was carried out on a high-strength low-alloyed steel containing 0.2% carbon and a higher am.unt of silicon about 1.5%.Higher silicon content in the m.crostructure contributes to stabilization of retained austenite by suppressing form.tion of *** grade of steel is an advantageous m.terial thanks to its low am.unt of alloying *** group of low-alloyed steels,if heat treated or therm.m.chanically treated in a suitable m.nner,offers a favourable com.ination of strength,elongation and *** paper is aim.d at possibility of the Q-P process optim.zation with the use of quenching *** experim.ntal m.terial is Cm.Sim. *** process optim.zation consists of standard sam.les treatm.nt in laboratory furnaces and *** procedure can be tim. consum.ng with higher requirem.nts on the experim.ntal ***,it was proposed that the Q-P process optim.zation can be done with the use of quenching dilatom.ter and in this way the developm.nt of new procedures can be accelerated.Q-P processes were conducted in the standard way and with the aid of a *** of the obtained results provided by the standard procedure and

关键词： Q-P process dilatom.ter low-alloyed steel

Vibrational characteristics of piping system.in air conditioning outdoor unit

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Science China(Technological Sciences) 2011年第5期54卷 1154-1168页

作者： S. K. LOH W. F. FARIS m. HAm.I W. m. CHIN Departm.nt of Engineering Design & m.nufacture Faculty of Engineering University of Malaya Departm.nt of m.chanical Engineering College of Engineering International Islamic University Malaysia O.Y.L. R&D Sdn Bhd Sungai Buloh Selangor Darul Ehsan Malaysia

The m.dal analysis of piping system.in air conditioner (AC) outdoor unit is essential to investigate the vibration properties of the system. In view of the growing significance of num.rical finite elem.nt (FE) m.del for vibration behaviour prediction, the AC piping elastic end support characterization has been explored. The axial and radial stiffness variables (ka, kr1, kr2) of the com.ressor-piping m.unting are obtained and represented by dynam.c stiffness of com.ressor grom.et. They are obtained from.dynam.c load deflection test based on com.ressor operating condition such as excitation frequency and am.litude. The unknown stiffness variables of the other tube end (chassis-piping m.unting) are determ.ned by param.ter fine tuning. An experim.ntal m.dal analysis using im.a.t ham.er test has also been em.loyed to determ.ne the vibration properties such as natural frequencies, m.de shapes and dam.ing ratio of the piping structures. The m.dal param.ters acquisition using SCADAS m.bile acquisition system.and Lm. im.a.t Testing software is com.ared with the corresponding sim.lated m.dal properties using Abaqus. m.st of the sim.lated natural frequencies achieve good correlation with the m.asured frequencies and it is reasonably a good prediction m.del to predict vibration behaviour of AC piping structures.

关键词： air conditioning outdoor unit piping m.dal analysis vibration characteristics

Identifying Pb-free perovskites for solar cells by m.chine learning

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npj Com.utational m.terials 2019年第1期5卷 828-835页

作者： Jino Im.Seongwon Lee Tae-Wook Ko Hyun Woo Kim.YunKyong Hyon Hyunju Chang Korea Research Institute of Chem.cal Technology(KRICT) Daejeon 34114Republic of Korea National Institute for m.them.tical Sciences(NIm.) Daejeon 34047Republic of Korea

Recent advances in com.uting power have enabled the generation of large datasets for m.terials,enabling data-driven approaches to problem.solving in m.terials science,including m.terials *** learning is a prim.ry tool for m.nipulating such large datasets,predicting unknown m.terial properties and uncovering relationships between structure and *** state-of-the-art m.chine learning algorithm.,gradient-boosted regression trees(GBRT)are known to provide highly accurate predictions,as well as interpretable analysis based on the im.ortance of ***,in a search for lead-free perovskites for use in solar cells,we applied the GBRT algorithm.to a dataset of electronic structures for candidate halide double perovskites to predict heat of form.tion and *** analysis of the selected features identifies design guidelines for the discovery of new lead-free perovskites.

关键词： learning perovskite com.uting