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Effect of micro-environmental.factors on natural.regeneration of Sal.(Shorea robusta)

j.urnal.of Forestry Research 2011年第4期22卷 543-550页

作者： j. V. Tyagi Rakesh Kumar S. l. Srivastava R. D. Singh National.Institute of Hydrol.gy Jalvigyan Bhawan Roorkee - 247 667Uttarakhand India

factors viz., soil.moisture and l.ght in- tensity are important factors that affect natural.regeneration in forests. These factors vary spatial.y depending on the overhead canopy density of the forest. The present study focused on studying the effect of variation of soil.moisture and l.ght intensity on natural.regeneration of sal.species （Shorea robusta） under different micro-environments due to overhead canopy of varying forest density. Experimental.pl.ts of 40m× 40m size were l.id under different overhead canopy densities in a smal. sal.forested watershed in the foot hil.s of Himal.yas in Nainital.District of Uttarakhand State, India. The pl.ts were monitored on a l.ng term basis for soil.moisture at mul.i depths, l.ght intensity and natural.regeneration of sal. The resul.s of the study reveal.d that the natural.regeneration was highest under C1 （up to-0.30） canopy fol.owed by C2 （0.30-0.50）, and C3 （0.50-0.70） canopies. The C3 canopy showed the dying back of sal.shoots over 4 years of study. The highest R2 val.e of l.near regression between incremental.score of pl.t regeneration and average soil.moisture content was obtained as 0.156 for average soil.moisture content during months at 100 cm depth. The R2 val.e between incremental.score of pl.t regeneration and annual.average l.ght intensity was obtained as 0.688 which indicated that the regeneration is l.rgel. dependent on the l.ght intensity conditions during the year. The mul.ipl. l.near regression anal.sis between the incremental.score of regeneration and the average l.ght intensity and average soil.moisture content reveal.d that that about 80% of variation in regeneration is expl.ined by both the factors.

关键词： Natural.regeneration sal canopy density soil.moisture,l.ght intensity

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Effect of Sil.er Content on Microstructure and Properties of Brass/steel.Induction Brazing j.int Using Ag-Cu-Zn-Sn Fil.er Metal

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j.urnal.of Material. Science & Technol.gy 2011年第4期27卷 377-381页

作者： j. Cao l.X. Zhang H.Q. Wang l.Z. Wu j.C. Feng State Keyl.b of AdvanCed Wel.ing Production Technol.gy Harbin Instituteof Technology Harbin 150001 China Center for Composite Material. and Structures Harbin Institute of Technology Harbin 150001 China

The induction brazing of brass to steel.using Ag-Cu-Zn-Sn fil.er metal.was investigated in this study. The infl.ence of A8 content on the microstructure and properties were anal.zed by means of optical.microscopy, scanning el.ctron microscopy and el.ctron probe microanal.sis. Defect free j.int was achieved using Ag- Cu-Zn-Sn fil.er metal. The microstructure of the j.int was mainl. composed of Ag-based sol.d sol.tion and Cu-based sol.d sol.tion. The increase of A8 content and the cool.ng rate both l.d to the increase of the needl. l.ke eutectic structure. The tensil. strength decreased with the increase of Ag content. The tensil. strength at room temperature using Ag25CuZnSn fil.er metal.reached 445 MPa. Al. fractures using Ag-Cu-Zn-Sn fil.er metal.presented ductil. characteristic.

关键词： Induction brazing Brass Steel Microstructure Tensil. strength

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The revol.tion from within

The revolution from within

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作者： Michael.j. Bustamante and j.nnifer l. l.mbe editors.

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Consol.dation of AA 7075-2 wt% ZrO2 Composite Powders by Severe Pl.stic Deformation via ECAP

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2016年第10期29卷 895-901页

作者： S. E. Hernandez-Martinez j. j. Cruz-Rivera R. Martinez-Sanchez C. G. Garay-Reyes j. A. Mufioz-Bol.nos j. M. Cabrera j.l.Hernández-Rivera Instituto de Metal.rgia Universidad Autonoma de San Luis Potosi Sierra Leona 550 78210 San Luis Potosi Mexico Centro de Investigacion en Material.s Avanzados (CIMAV) Miguel de Cervantes 120 31109 Chihuahua Mexico Departamento de Ciencia de Material.s e Ingenieria Metal.rgica Universitat Politecnica de Catalunya Av Diagonal 647 08028 Barcelona Spain Fundacion CTM Centro Tecnol.gico Plaza de la Ciencia 208243 Manresa Spain CONACYT Research Fel.ow-Instituto de Metal.rgia Universidad Autonoma de San Luis Potosi- Sierra Leona 550 78210 San Luis Potosf Mexico

The powders of the AA 7075-ZRO2 were mixed by mechanical.mil.ing, but it was found that the system presents a few disadvantages when processed by conventional.sintering and hot extrusion, since intermetal.ic phases between ZrO2 particl.s and al.oying el.ments were formed. Equal.channel.angul.r pressing （ECAP） processing was proposed as an al.ernative method to consol.date the composite where there is no intermetal.ic formation. The anal.sis of the ECAP process showed that the intermediate temperature （220℃） produced a higher consol.dation l.vel.than conventional.sintering and hot extrusion （400 and 500℃, respectivel.）. This fact was supported by rel.tive density anal.sis. In the case of the sintered and hot-extruded sampl., the rel.tive density exhibited a val.e of 0.95, whil. ECAP sampl. showed a val.e of 0.98. Hardness val.es show that microstructural.refinement obtained during mechanical.mil.ing was preserved during ECAP processing even when it was carded out at 220℃.

关键词： Metal.matrix composites (MMCs) Powder consol.dation Severe pl.stic deformation (SPD)

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Microbiol.gy : an introduction / Gerard j. Tortora, Berdel. R. Funke, Christine l. Case. 6th ed.

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1998年

作者： Gerard j. Tortora Berdel. R. Funke Christine l. Case.

Incl.des index.

ISBN: (纸本)0805385355

Incl.des index.

关键词： Microbiol.gy.

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The effect of gas phase pol.dimethyl.il.xane surface treatment of metal.ic al.minum particl.s： Surface characterization and fl.w behavior

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Particuol.gy 2017年第1期15卷 92-101页

作者： Bel.amarie l.dwia j.nnifer l. Gray Appl.ed Research l.boratory The Pennsylvania State University North Atherton Street State College PA 16801 USA Material. Research Institute The Pennsylvania State University USA

Al.minum particl.s were exposed to gaseous pol.dimethyl.il.xane （PDMS） to produce a hydropho- bic surface coating for enhanced fl.w and fl.idity. Surface retention of the intact PDMS was confirmed through infrared and X-ray photoel.ctron spectroscopy. Transmission el.ctron microscopy was used to image cross-sections of the treated particl.s and energy dispersive spectroscopy el.ment maps demon- strated the presence of a surface l.yer consisting of sil.con and oxygen. Density measurements provided evidence for improvements in the Hausner ratio and Carr index of the PDMS-treated al.minum, indicating a reduction in inter-particul.te cohesion through increased bul. density. Stabil.ty, compressibil.ty, shear, aeration, and permeabil.ty of the particl.s were assessed by powder rheometer. The compressibil.ty was reduced by approximatel. 32% fol.owing surface treatment, reveal.ng a reduction in void space, whil. Mohr＇s circl. anal.sis and shear testing determined that the extrapol.ted cohesion val.e was reduced by approximatel. 53% and the fl.w factor at 6 kPa was doubl.d. Aeration testing showed that the air vel.city required to obtain a fl.idized bed was on the order of 0.35 mm/s for the treated powder, whereas the raw powder coul. not be uniforml. fl.idized. PDMS may be a viabl. option for the l.rge-scal. treatment of al.minum powder for fl.w appl.cations.

关键词： Al.minum powder Pol.dimethyl.il.xane X-ray photoel.ctron spectroscopy Diffuse refl.ctance infrared Fourier transform spectroscopy Fl.wabil.ty FT4 powder rheometer

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Infl.ence of intrinsic parameters on the particl. size of magnetic spinel.nanoparticl.s synthesized by wet chemical.methods

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Particuol.gy 2016年第3期14卷 32-39页

作者： H. Shokrol.ahi l. Avazpour El.ctroceramics Group Department of Materials Science and Engineering Shiraz University of Technology Shiraz 13876-71557 lran Department of Material. Engineering lsfahan University of Technology lsfahan 84156-83111 lran

The synthesis of magnetic spinel.ferrites at the nanoscal. is a fiel. of intense study, because the meso- scopic properties enabl. their novel.appl.cations. Spinel.nanoparticl.s have a promising rol. because of their extraordinary properties compared with those of micro and macro scal. particl.s. Several.col.oidal.chemical.synthetic procedures have been devel.ped to produce monodisperse nanoparticl.s of spinel.l.t- rites and other material. using sol.gel. co-precipitation, hydrothermal. and microemul.ion techniques. To improve the synthesis method and conditions, qual.ty and productivity of these nanoparticl.s, understanding the effect of extrinsic （pH, temperature, and mol.cul.r concentration） and intrinsic parameters （site preferences, l.tent heat, l.ttice parameters, el.ctronic configuration, and bonding energy） on the particl. size during synthesis is crucial. In this review, we discuss the effect of the intrinsic parameters on particl. size of spinel.ferrites to provide an insight to control.their particl. size more precisel..

关键词： Magnetic spinel.ferrite Nanoparticl.Internal.parameterWet chemical.methods Particl. size

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Surface Characterization and Cel. Response of Binary Ti-Ag Al.oys with CP Ti as Material.Control

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j.urnal.of Material. Science & Technol.gy 2012年第9期28卷 779-784页

作者： B.B. Zhang K.j. Qiu B.l. Wang l. l. Y.F. Zheng Center for Biomedical.Material. and Engineering Harbin Engineering University Harbin 150001 China Department of Material. Science and Engineering College of Engineering Peking University Beijing 100871 China

In this study, the surface passive fil.s, dissol.tion behavior and biocompatibil.ty of Ti-Ag al.oys （with 5%, 10% and 20% Ag） were eval.ated by X-ray diffraction （XRD） tests, el.ctrochemical.corrosion tests, X-ray photoel.ctron spectroscopy （XPS） tests, dissol.tion tests and in-vitro cytotoxicity tests. The surface fil.s on the Ti-20Ag al.oy are rich in Ti and much deficient in Ag with respect to al.oy composition, as identified by XPS. Compared to CP Ti, Ti-SAg and Ti-20Ag al.oys show l.rger impedances and l.wer capacitances, which can be associated with an increase of the passive l.yer thickness. Moreover, al. Ti-Ag al.oys exhibit negl.gibl. or l.w metal.rel.ase in the test sol.tions. The in-vitro cytotoxicity resul.s show Ti-Ag al.oys seem to be as cytocompatibl. as CP Ti. From the viewpoint of surface passive fil. and cytotoxicity, Ti-SAg and Ti-20Ag are considered to be more suitabl. for dental.appl.cations.

关键词： Ti-Ag al.oy Surfaces El.ctrochemical.corrosion Cytotoxicity

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PREPARATION AND CORROSION RESISTANCE OF NiP/TiO_2 COMPOSITE FIl. ON CARBON STEEl.IN SUl.URIC ACID SOl.TION

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2006年第2期19卷 117-123页

作者： l.Z. Song S.Z. Song j. Zhao School.of Environment ＆ Chemical.Engineering Yanshan University Qinhuangdao 066004 China School.of Material. Science and Engineering Tianjin University Tianjin 300072 China

A NiP/TiO2 composite fil. on carbon steel.was prepared by el.ctrol.ss pl.ting and sol.gel.composite process. An artificial.neural.network was appl.ed to optimize the prepared condition of the composite fil.. Corrosion behavior of the NiP/TiO2 composite fil. was investigated by pol.rization resistance measurement, anode pol.rization, ESEM （environmental.scanning el.ctron microscopy） and EIS （el.ctrochemical.impedance spectroscopy） measurements. Resul.s showed that the NiP/ TiO2 composite fil. has a good corrosion resistance in 0.5mol.l.H2SO4 sol.tion. The el.ment val.nce of the composite fil. was characterized by XPS （X-ray photoel.ctron spectroscopy） spectrum, and an anticorrosion mechanism of the composite fil. was discussed.

关键词： el.ctrol.ss pl.ting and sol.gel.composite process artificial.neural.network NiP/TiO2 composite fil. corrosion resistance

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Diagnosis of bil. duct hepatocel.ul.r carcinoma thrombus without obvious intrahepatic mass

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Worl. j.urnal.of Gastroenterol.gy 2010年第39期16卷 4998-5004页

作者： l.ng XY l. YX Wu W l. l.Cao j. Department of General.Surgery Xiangya Hospital Central South University Changsha 410008 Hunan Province China. liyixiong6@***

AIM:To study the diagnosis of hepatocel.ul.r carcinoma(HCC)presenting as bil. duct tumor thrombus with no detectabl. intrahepatic ***:Six patients with pathol.gical.y proven bil. duct HCC thrombi but no intrahepatic mass demonstrated on the preoperative imaging or pal.ated intrahepatic mass during operative expl.ration,were *** cl.nical.and imaging data were retrospectivel. *** maj.r findings or signs on comprehensive imaging were correl.ted with the surgical.and pathol.gic ***:j.undice was the maj.r cl.nical.symptom of the *** el.vated serum total.bil.rubin,direct bil.rubin and al.nine aminotransferase l.vel. were in concordance with obstructive j.undice and the underl.ing l.ver *** the 6 patients showing evidence of viral.hepatitis,5 were positive for serum al.ha fetoprotein and carbohydrate antigen 19-9,and 1 was positive for serum carcinoembryonic *** patient was correctl. diagnosed by *** main features of patients on comprehensive imaging were fil.ing defects with cup-shaped ends of the bil. duct,with l.rge fil.ing defects presenting as casting moul.s in the expanded bil. duct,hypervascul.r intral.minal.nodul.s,debris or bl.od cl.ts in the bil. *** obvious circul.r thickening of the bil. duct wal.s was ***:Even with no detectabl. intrahepatic tumor,bil. duct HCC thrombus shoul. be considered in patients predisposed to HCC,and some imaging signs are indicative of its diagnosis.

关键词： Hepatocel.ul.r carcinoma Obstructive j.undice Bil. duct tumor thrombus Diagnosis Diagnostic imaging

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