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DETERMINE ON INITIAl DIMENSIONAl STABIlITY OF CHEMICAl MODIFIED WOOD

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Journal of Northeast Forestry University 1991年第1期2卷 70-78页

作者： Banks W. B. Jones g.l. North Wales University North Wales University United KingdomUnited Kingdom

Strain development along radial direction was continuously determined by D-200 linear Variable Differential Transformers (l.V.D.T). When a wood specimen was put into water and begin to swell from absolute dry moisture content to the maximum. Experiment results show that the differences of swelling with soaking time between untreated and treated wood specimens due to uptaking water. It would also give an indication to the effectiveness of various chemicals on the dimensional stability of modified wood. ASE of modified wood samples with SA-EP, EP and SA were found to be better than MA-AgE. SA-EP had got the best effetivencss on dimensional stability in reducing the swelling.

关键词： Swelling Determination Modified wood

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物理的土壤学灌溉与非灌溉土壤的物理学

物理的土壤学灌溉与非灌溉土壤的物理学

HREM STUDY OF THE AUSTENITE/MARTENSITE INTERFACES IN AN Fe-9Ni AllOY

1983年

作者：（美）泰勒（S.A.Taylor）（）g.l.阿斯克拉夫特修订华孟译

本书说明了土壤水的能量关系、土壤水运动、土壤水测定以及田间土壤中水的保持和流动。

ISBN: (纸本)16144·2521

本书说明了土壤水的能量关系、土壤水运动、土壤水测定以及田间土壤中水的保持和流动。

关键词：土壤物理学学科:研究

来源：汇雅图书（南通市图书馆... 评论

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Acta Metallurgica Sinica(English letters) 1997年第5期10卷 386-391页

作者： li, g.l. Meng, X.M. Zhang, F.T. Wu, Y.K. Inst of Metal Research Chinese Acad of Sciences Shenyang China

The atomic level structures of fcc/bcc interfaces in an Fe-9Ni alloy have been examined by means of HREM. It has been found that the orientation of γ prime /α interface had great effects on its atomic structure. These interfaces with different orientations may be composed of only structural ledges, structural ledges with misfit dislocations, superledges with misfit dislocations or only misfit dislocations. A structural model of growth ledge was suggested. The terrace of growth ledge was composed of structural ledges or misfit dislocations. The atomic structure of the riser of growth ledge was the same as that of the side facet of γ prime lath, which is composed of superledges with misfit dislocations.

关键词： Austenite Electron microscopy Interfaces (materials) Martensite Nickel alloys

EFFECTS OF Zn CONCENTRATION ON WETTABIlITY OF Sn-Zn AllOY ON Cu AND ON THE INTERFACIAl MICROSTRUCTURE BETWEEN Sn-Zn AllOY AND Cu

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Acta Metallurgica Sinica(English letters) 2006年第4期19卷 251-257页

作者： H.Z. Huang X.Q. Wei l. Zhou X.D. liu g.l. guo School of Materials Science and Engineering Nanchang University Nanchang 330047 China East China Institute of Technology Fuzhou 344000 China

The potential of using a hypoeutectic, instead of eutectic, Sn-Zn alloy as a lead-free solder has been discussed. The nonequilibrium melting behaviors of a series of Sn-Zn alloys were examined by differential thermal analysis. It was found that at a heating rate of 5℃/min, *** exhibited no melting range. Dipping and spreading tests were carried out to characterize the wettability of Sn-Zn alloys on Cu. Both tests exhibited that Sn-6.5Zn has significantly better wettability on Cu than Sn-9Zn. The reaction layers formed during the spreading tests were examined. When the Zn concentration fell between 2.5wt%-9wt%, two reaction layers were formed at the interface, a thick and flat Cu5Zn8 adjacent to Cu and a thin and irreg.l.r Cu-Zn-Sn layer adjacent to the alloy. Only a Cu0Sn5 layer was formed when the Zn concentration decreased to 0.5wt%. The total thickness of the reaction layer（s） between the alloy and Cu was found to increase linearly with the Zn concentration.

关键词： lead-free solder Sn-Zn alloy wettability interface intermetallic compound

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嘉氏商谈精诀

嘉氏商谈精诀

Alternate erosion and deposition in the Yangtze Estuary and the future change

1990年

作者：嘉洛斯(Karrass C.l.)

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Journal of geographical Sciences 2020年第1期30卷 145-163页

作者： ZHU Boyuan lI Yitian YUE Yao YANg Yunping.l.ANg Enhang ZHANg Chuncai BORTHWICK Alistair g.l. School of Hydraulic Engineering Changsha University of Science&TechnologyChangsha 410114China Key laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China School of Water Resources and Hydropower Engineering State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhan 430072China Key laboratory of Engineering Sediment Tianjin Research Institute for Water Transport EngineeringMinistry of TransportTianjin 300456China The Key laboratory of Water and Sediment Sciences Ministry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China School of Engineering The University of EdinburghThe King’s BuildingsEdinburgh EH93JLUK

The morphological changing trend of the Yangtze Estuary, the largest estuary of Asia, has become a focus of research in recent years. Based on a long series of topographic data from 1950 to 2015, this paper studied the erosion-deposition pattern of the entire Yangtze Estuary. An alternation between erosion and deposition was found during the past 65 years, which was in correspondence to the alternation between flood and dry periods identified by multi-year average duration days of high-level water flow (defined as discharge ≥ 60,000 m3/s, namely, D≥60,000) from the Yangtze River Basin. A quantitative relationship was further developed between the erosional/depositional rate of the Yangtze Estuary and the interpreting variables of yearly water discharge, D≥60,000 and yearly river sediment load, with contributing rates of 1%, 59% and 40%, respectively. Mechanism behind the alternate erosion and deposition pattern was analyzed by examining residual water surface slope and the corresponding capacity of sediment transport in flood and dry periods. In flood periods, a larger discharge results in steeper slope of residual water level which permits a greater capacity of sediment transport. Therefore, more bed materials can be washed to the sea, leading to erosion of the estuary. In contrast, flatter slope of residual water level occurs in dry periods, and deposition dominates the estuarine area due to the decreased capacity of sediment transport and the increased backwater effect of flood-tide. Coastal dynamics and estuarine engineering projects alter the local morphological changes, but slightly affect the total erosional/depositional rate of the whole estuarine region. Heavy sedimentation within the Yangtze Estuary after the impoundment of the Three gorges Dam can be attributed to the reduced occurrence frequency of flood years due to water reg.l.tion by the dam, and larg.l. (at least 36%-52%) sourced from the sea. Deposition is still poss

关键词： Yangtze Estuary erosion and deposition alternation total sediment load evolutional trend

THE α_2/γ INTERFACIAl STRUCTURE CHANgES IN A DUAl-PHASE γ-TiAl AllOY AFTER HOT DEFORMATION AND SUBSEQUENT SHORT-TIME ANNEAlINg

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Acta Metallurgica Sinica(English letters) 1997年第6期10卷 501-509页

作者： l.C. Zhang g.l. Chen J. g. Wang and H.Q. Ye(State Key laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083, China.)(laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy Univ of Science and Technology Beijing Beijing China

The nonequilibrium α2/γ interfacial structures have been studied using the conventional and high-resolution transmission electron microscope. The nonequilibrium γ/γ and α2/γ interfaces are important microstructure features of hot-forged Ti-45Al-8Nb2.5Mn-0.05B alloys. The characteristics of these nonequilibrium interfacial boundaries include the frequent interfacial ledges and the deviation from the conventional orientation relationship {111}γ.

关键词： α_2/γinterface interface deformation twin HRTEM

EFFECTS OF lINEAR ElECTROMAgNETIC STIRRINg ON THE SOlIDIFICATION STRUCTURE OF BIllET

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Acta Metallurgica Sinica(English letters) 2001年第3期14卷 227-234页

作者： H.l. Zhang, E.g. Wang, g.l. Jia and J.C. He (Key laboratory of National Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China) Northeastern Univ. Shenyang 110004 China

The effects of linear electromagnetic stirring (EMS) on the solidification structure of billet were investigated by experiments, and the electromagnetic field and the flow field during the stirring process were analyzed by numerical simulation. The results show that the billet of almost 100% equiaxed grains can be obtained by applying.l.near EMS at the maximum intensity of 1414 A·Hz1/2, while the maximum electromagnetic force and the maximum velocity in the molten steel are 6386 N·m-3 and 0.22 m·s-1 respectively. It is shown that in the pulsating electromagnetic force which is perpendicular to the movement of the molten steel is an important factor of increasing the equiaxed zone ration in the solidification structure, which further prevents the appearance of white band and internal defects.

关键词： Computer simulation grain growth Magnetoelectric effects Mixing Solidification

THREE-DIMENSIONAl CHARACTERISTICS AND HOMOgENIZATION OF ElECTROMAgNETIC FIElD IN SOFT-CONTACT CONTINUOUS CASTINg MOlD

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Acta Metallurgica Sinica(English letters) 2001年第2期14卷 137-142页

作者： A. Y. Deng, g.l. Jia and J.C. He (Key laboratory for Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China) Northeast Univ. Shengyang 110004 China

The three-dimensional electromagnetic characteristics and non-uniform distribution of electromagnetic field in soft-contact continuous casting mold have been analyzed by numerical simulation. The results show that the maximum electromagnetic flux density is found in front of slit; the electromagnetic flux density becomes large as the coil current and slit number increase. In a certain frequency range, the electromagnetic flux density increases with the increase of frequency and the frequency range is different with the change of azimuthal position along the inner wall of mold. The uniformity of electromagnetic field is influenced mainly by frequency and mold structure parameters. Increasing slit number and adjusting slit arrangement position can improve the electromagnetic flux density and the uniformity of electromagnetic field. For a soft-contact mold with 16 slits, when frequency is 20 kHz, the optimal slit arrangement parameter is a:b=1:2, c=0.

关键词： Computer simulation Electromagnetic fields Magnetic properties Molds Optimization Three dimensional