P. R. Ding
,
D. Y. Ju
,
T. Lnouc and E. de Vries( 1) MSC Japan Ltd.
,
Osaka
,
Japan 2) Saitama Institute of Technology
,
Saitama
,
Japan 3) Kyoto Universily
,
Kyoto
,
Japan 4) MacNeal - Schwendler (E. D. C. ) B. V.
,
Gouda
,
The Netherlands)
金属学报(英文版)
A method to simulate processes of forging and subsequent heat treatment of an axial symmetric rod is formulated in eulerian description and the feasibility is investigated. This method uses finite volume mushes for troching material deformation and an automatically refined facet surface to accurately trace the free surface of the deforming material.In the method,the deforming work piece flows through fixed finite volume meshes using eulerian formulation to describe the conservation laws,Fixed finite volume meshing is particularly suitable for large three-dimensional deformation such as forging because remeshing techniques are not required, which are commonly considered to be the main bottelencek in the ssimulations of large defromation by using the finite element method,By means of this finite volume method, an approach has been developed in the framework of "metallo-thermo-mechanics" to simulate metallic structure, temperature and stress/strain coupled in the heat treatment process.In a first step of simulation, the heat treatment solver is limited in small deformation hypothesis,and un- coupled with forging. The material is considered as elastic-plastic and takes into account of strain, strain rate and temperature effects on the yield stress.Heat generation due to deformation,heat con- duction and thermal stress are considered.Temperature - dependent phase transformation,stress-in- duced phase transformation,latent heat,transformation stress and strain are included.These ap- proaches are implemented into the commerical commercial computer program MSC/SuperForge and a verification example with experimental date is given as comparison.
关键词:
finite volume method
,
null
,
null
,
null
,
null
杨慧芬
,
唐琼瑶
,
王传龙
,
张露
,
李甜
中国有色金属学报
为考察红城红球菌(Rhodococcus erythropolis,R. erythropolis)作为赤铁矿捕收剂使用的可能性及效果,对R. erythropolis形貌、细胞壁成分及其吸附前后赤铁矿、石英表面电性、疏水性进行分析,对赤铁矿、石英单矿物以及赤铁矿与石英矿1:1(质量比)混合矿进行浮选实验,对其在赤铁矿表面的吸附状况及吸附机理进行研究.结果表明,杆状R. erythropolis表面既含有非极性基团,又含有极性基团,使得其表面具有较高的负电性和较强的疏水性,因而对赤铁矿的吸附作用明显大于对石英的吸附作用.当以此细菌为捕收剂、在溶液 pH 值为6、R. erythropolis用量为75 mg/L时,赤铁矿的回收率为89.68%,而石英的回收率仅为26.25%.混合矿经过一次浮选,可获得铁品位和回收率分别为50.08%和76.41%的铁精矿.R. erythropolis在赤铁矿表面发生复杂的化学吸附且使赤铁矿颗粒形成疏水絮团,从而证实R. erythropolis可作为赤铁矿的捕收剂使用.
关键词:
R. erythropolis
,
微生物
,
赤铁矿
,
石英
,
吸附
,
絮团
,
捕收剂
朱海燕
,
王雪兆
,
尹家兴
,
李丁丁
,
魏永豪
,
陈志军
高分子材料科学与工程
采用原位活性聚合法在玻璃表面接枝聚苯乙烯与聚4-乙烯吡啶无规共聚物（PS-r-P4-VP）＂刷子＂,并对其进行表征。X射线光电子能谱（XPS）结果表明,玻璃表面接枝共聚物后,Si（1s/2p）、O（1s）的吸收峰强度降低,C（1s）吸收峰强度增强并出现了N（1s）（吡啶环）的特征吸收峰;椭圆偏振仪测试结果表明,接枝PS-r-P4-VP的厚度随聚合时间延长而增加,表面均方粗糙度则减小;原子力显微镜（AFM）观察结果表明,随着St配比的增加,玻璃表面聚合物＂刷子＂粗糙度降低;红外光谱（FT-IR）表明,玻璃表面的聚合物为PS-r-P4-VP;透光率测试表明,在玻璃表面接枝PS-r-P4-VP并不影响玻璃的透光率;接触角测试结果表明,接枝共聚物的玻璃表面接触角随着St比例的增加而显著增大。
关键词:
原位接枝
,
聚合物“刷子”
,
聚苯乙烯与聚4-乙烯吡啶无规共聚物
陶明
,
熊伟
,
陈华
,
李贤均
催化学报
合成了(R,R)-1,2-二苯基乙二胺((R,R)-DPEN)、钌和三苯基膦的三元配合物RuCl2[P(C6H5)3]2-(R,R)-DPEN,并将其用于萘乙酮的不对称加氢反应.考察了碱/催化剂的摩尔比、反应温度和氢气压力等对催化活性和对映选择性的影响.结果表明,多种因素对反应的转化率和对映选择性均有影响.在萘乙酮:(CH3)3COK:催化剂摩尔比为50 000:450:1,氢气压力为4 MPa,反应温度为25℃的条件下,反应16 h时,萘乙酮生成α-萘乙醇的产率和对映选择性分别达到了100%和83%.
关键词:
钌膦配合物
,
手性二胺
,
萘乙酮
,
不对称催化加氢
,
α-萘乙醇
,
对映选择性
周训飞
,
赵小明
,
郭智恺
,
刘志刚
工程热物理学报
应用P-R方程编制了容积绝热指数与温度绝热指数的计算程序,利用该程序计算了HFC-161,HC-290,HC-600a的绝热指数,绘出了三种制冷剂的容积绝热指数与温度绝热指数随对比压力与对比温度变化的图线,并加以对比与分析。结果表明,HC-600a的两种绝热指数值都较小,在压缩机进出口条件一致的状况下,较适于作为替代制冷剂。
关键词:
替代制冷剂
,
绝热指数
,
P-R方程
陈志军
,
魏永豪
,
朱海燕
,
杨清香
高分子材料科学与工程
用乳液聚合的方法合成了交联P（St-r-AA）包覆的Fe3O4粒子,研究了该类粒子对Cu2＋离子的吸附性能。透射电镜（TEM）表明,交联的P（St-r-AA）包覆的Fe3O4磁性粒子粒径约100 nm;X射线衍射（XRD）分析表明,磁性粒子中磁性物质为尖晶石结构的Fe3O4;红外光谱（FT-IR）表明,Fe3O4表面的聚合物含有苯环和羧基;热重（TG）分析表明,粒子中磁性粒子的含量为31%;P（St-r-AA）包覆的Fe3O4磁性粒子具有超顺磁性,比饱和磁化强度为0.822 A.m2/kg;UV-vis表明磁性粒子能够有效吸附溶液中的Cu2＋离子。
关键词:
交联P(St-r-AA)
,
磁性纳米粒子
,
Cu2+离子吸附
武秀兰
,
任强
,
王芬
硅酸盐通报
doi:10.3969/j.issn.1001-1625.2006.01.008
在普通石灰碱釉的基础上引入骨粉和滑石,形成R2O-RO-Al2O3-SiO2-P2O5系统釉料,通过调整釉料的化学组成获得分相/析晶乳浊釉.利用XRD,SEM,EDS等测试技术,研究了SiO2与P2O5和SiO2与MgO的摩尔比与釉层显微结构的关系,分析了乳浊粒子(玻璃液滴和微晶)的形成机理.
关键词:
乳浊釉
,
分相
,
析晶
,
机理
Journal of Solid State Chemistry
The subsolidus phase relations of R2O3-CaO-CuO ternary systems (R = Nd, Sm, Gd, Tm) have been investigated by X-ray powder diffraction. All samples were synthesized at about 950degrees in air. There exists a ternary compound Ca14-xRxCu24O41 (x = 4 for R = Nd, Gd and x = 5 for R = Sm) and a ternary solid solution Ca2+xR2-xCu5O10 (R = Nd, Sm, Gd, Tm) with a wide composition range Deltax of about 0.6. The compound Ca14-xRxCu24O41 possesses a layered orthorhombic structure and is isostructural to Sr14-xCaxCu24O41. The lattice parameters a and c of the compound are basically independent of the ionic radius of R, while the lattice parameter b and unit-cell volume V decrease substantially with the decrease of the ionic radii of R. The Ca2+xR2-xCu5O10 solid solution is isostructural to Ca2+xY2-xCu5O10, the structure of which is based on an orthorhombic "NaCuO2-type" subcell containing infinite one-dimensional chains of edge-shared square planar cuprate groups crosslinked by the layered cations Ca and R that locate in the inter-chain tunnels. (C) 2002 Elsevier Science (USA). All rights reserved.
关键词:
R2O3-CaO-CuO (R = Nd, Sm, Gd, Tm) systems;phase relations;Ca10R4Cu24O41 (R = Nd, Sm, Gd) structure;Ca2+xR2-xCu5O10 (R = Nd, Sm,;Gd, Tm) structure;ternary-system;approximately 950-degrees-c;high-pressure;superconductivity;diagram;air;er;compatibilities;property;oxide
Communications in Theoretical Physics
The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.
关键词:
diamond anvil cell;pressure measurement;spectroscopy;temperatures
