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| 1 | EFFECT OF PRECIPITANT ON THE PROPERTIES OF ULTRAFINE YTTRIA POWDER PRODUCED BY PRE CIPITATION METHOD显示文摘Using yttriu m nitrate as the m other salt , synthesis of ultrafine yttria po w der through w et che mical route w as investigated . Choice of precipitant has dra m atic effects on co m position ,particle size distribution and particle m orphology of the precipitates . When a m m onia solutionw as used as the precipitant , the precursor precipitate w as m ainly Y2( O H) 5 14( N O3) 0 86· H2 O with co m paratively large particle size , broad size distribution and co m plex particleshapes . When sodiu m hydroxide solution w as used , roughly spherical α Y( O H)3·3 H2 Opre cipitate w ith sm all particle size and narro w size distribution w as obtained . The transfor m a tion sequence of dry α Y( O H)3 ·3 H2 O gel during calcination w as determ ined to be α Y( O H) 3·3 H2 O→ Y O O H→ Y2 O3 . After calcining at 600 ℃ for 1 hour , both Y2( O H) 5 14( N O3) 0 86· H2 O and α Y( O H) 3·3 H2 O transfor m to well crystallized Y2 O3 pow ders ,w ith particle sizes of 50 ~3000 n m and 20 n m , respectively . | Y. Q. Jia1) , J. G. Li1) , Y. M. Wang2) , L. X. Ding2) , X. M . Qin1) and X. D. Sun1)1) School of Materials and Metallurgy , Northeastern University , Shenyang 110006 , China2) Department of Materials , School of Mechanical Engineering , She | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 7 |
| 2 | Discrete large eddy simulation显示文摘Despite the intense effort expended towards obtaining a model for describing the turbulent flows of fluid, there is no model at hand that can do an adequate job. This leads us to look for a non-traditional approach to turbulence modeling. In this work we conjoin the notion of large eddy simulation with those of fuzzy sets and neural networks to describe a class of turbulent flows. In previous works we had discussed several issues concerning large eddy simulation such as filtering and averaging. Here, we discuss the use of fuzzy sets to improve the filtering procedure. | L. TAO, K. R. RAJAGOPAL and G. Q. CHEN(Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123,USACentre for Environmental Sciences, Peking University, Beijing 100871, China | 2001 | Communications in Nonlinear Science and Numerical Simulation2001，6，1： | 2 |
| 3 | RESEARCH ON SUPERPLASTICITY IN SiCp/2024Al AND SiCp/8090Al-Li COMPOSITES显示文摘The superplasticity in SiCp/Al alloy and SiCp/Al Li Composites is introduced The composites are prepared by powder metallurgy and cast methods The superplastic parameters are measured Superplastic treatment processing,secondary plastic working and the study of mirostructure are conducted. | Zhang Libin, Wang Zongren (School of Materials Science and Engineering,Harbin Institute of Technology) Hai Jintao (China Academy of Machinery Science and Technology) Sano T Murakoshi Y Takahashi M Hanada K Mechanical Engineering Laboratory,AIST,MITI,J | 2001 | Chinese Journal of Mechanical Engineering2001，14，4： | 2 |
| 4 | A study of the effect of a single neurotoxic dose of 3, 4-Methylenedloxymethamphetamine ( MDMA; 'Ecstasy') on the subsequent longterm behavior of rats in the plus maze and open field 显示文摘 | Mechan A Moran PI Elliott M | 2002 | Psychopharmacol2002，159，2： | 1 |
| 5 | Study on of copper-bearing austenitic antibacterial stainless steel by atomic force microscopy显示文摘 | Nan L Liu antibacterial YQ Lu M mechanism Q | 2008 | Journal of Materials Science: Materials in Medicine2008，19，9： | 1 |
| 6 | 显示文摘 | Pavlostathis S G Gossett J M A preliminary conversion mechanisms in anaerobic digestion of biological sludges | 1986 | Journal of Environmental Engineering ASCE1986，，114： | 1 |
| 7 | The Challenge of Canon-Part 3显示文摘 | D&M Nikkei'Mechanical | 2003 | D&M Nikkei Mechanical2003，，： | 1 |
| 8 | Charaterization of novel eircovims DNAs associated with wasting Syn- dromes in pigs显示文摘 | Mechan B M McNeilly F Ted D | 1998 | J Gen Viral1998，79，： | 1 |
| 9 | Hydration and mechanical properties of mortars prepared with mixed binder cement slurry-asphalt emulsion显示文摘 | POULIOT N MARCHAND mechanisms microstructure J PIGEON M | 2003 | J Mater Civ Eng2003，15，1： | 1 |
| 10 | Essential role of the histone methyltransferase G9a in cocaineinduced plasticity显示文摘 | Maze I Covington IH Dietz DM Renthal W Russo SJ Mechanic M | 2010 | Science2010，327，5962： | 1 |
| 11 | Enzyme a kinetic control element or designing synthetic biofuel pathways显示文摘 | Bond-Watts B mechanism as B Bellerose R J Chang M C Y | 2011 | Nature Chemical Biolo gy2011，7，22： | 1 |
| 12 | clinical isolates from the UK显示文摘 | Doumith M Ellington M J Livermore D M et aL Molecular mechanisms disrupting porin expression in ertapenem-resistant Klebsiella and Enterobacter spp | 2009 | JAntimicrob Chemother2009，63，4： | 1 |
| 13 | Perceived need and help -seeking in adults with mood, anxiety, or substance use disorders显示文摘 | Mojtabai R Olfson M Mechanic D | 2002 | Arch Gen Psychiatry2002，59，1： | 1 |
| 14 | The influence of the bchaviour of welded joints contai- ning cracks in the weld metal显示文摘 | Rodrigues D M Menczes L F HAZ softening on the mechanical Loureiro A | 2004 | Engineering Fracture Mechan- ics2004，71，1314： | 1 |
| 15 | Predicting medication noncompliance after hospital discharge among pa- tients with schizophrenia显示文摘 | Olfson M Mechanic D Hansell S | 2000 | Psychiatr Serv2000，51，2： | 1 |
| 16 | In vivo contri- bution of nestin-and GLAST-lineage cells to adult hip- pocampal neurogenesis显示文摘 | Decarolis NA Mechanic M Petrik D | 2013 | Hippocampus2013，23，8： | 1 |
| 17 | Determination of the addendum modification factors for gears with pre-established contact ratio显示文摘 | H Design of new tooth profile for Mechanism and Machine Theory Pedrero J I Art6s M Garcia-Prada J C | 1996 | Mechanism and Machine Theory1996，31，7： | 1 |
| 18 | A re view of the multisystemic consequences of obstruc tire jaundice and their impact on perioprative mot bidity and mobility显示文摘 | O'Connor M J Mechanical biliary obstruction | 1985 | Am Surg1985，51，24： | 1 |
| 19 | 3% gadolinium addition 显示文摘 | HE S M PENG L M ZENG X Q D1NG W J ZHU Y E Comparison of the naicrostructure and mechanical properties of a ZK60 alloy with and without 1 | 2006 | Materials Science and Engineering A2006，433，12： | 1 |
| 20 | Beneficial effect of mero-prolol in idiopathic dilated Cardiocnyopathy显示文摘 | Bristow M R mechanism M R Swedberg K | 1993 | Lancet1993，342，8885： | 1 |
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