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本文引进一个定义在L~∞(0,1)上格半范数ρp与一个熟知的格半范数ρ0关系,证明了在L~∞(0,1)中的序区间上,ρ0-拓扑与ρp-拓扑等价,从而证明了(L~∞(0,1),ρp)′的闭单位球是(L~∞(0,1),ρp)′的某个子集的弱-闭包,本文还证明了(L~∞(0,1),ρp)′可看作WeakLp(0,1)对偶空间的奇异部一个理想,而且这奇异部可由(L~∞(0,1),ρp)′与一算子族生成.(f)all(l.\n,oo(j.)=hillsill)t ̄.,iff ̄*(t)respectivelyall'l,L(q,1)isthepredlslaloftyreakLI',allllh,rlloll--at(,llli('llleasllrealga(l ̄s,arepresellta'tiolltlleorenlff,relelllelltsillSac,all(lS,,.isof)taille(l.However,ill[2],itisslldwnthattilerepreselltatiolltilesf)relllof)taille(lill[.5]isill(torre(?t.Inthisnote,wede 相似文献
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本文的主要结论为,实Banach空间X是强光滑的当且仅当时任给x0∈S(X),都存在p,q>0,p+q=1使这里un,νn∈S(X)∩B(x0,r)且un≠νn,(n=1,2,…).本文的结论比文[1]—[6]及[6]好。 相似文献
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DRS/SDS/NF体系中合成聚丁二烯
胶乳的粒子形态的研究 总被引:4,自引:0,他引:4
潘广勤 《高分子材料科学与工程》1999,15(5):19-133,137
在以岐化松香皂( D R S)、十二烷基硫酸钠( S D S)和间次甲基萘磺酸盐( N F)组成三元复合乳化剂体系中,研究了 S D S/ D R S、 N F/ D R S、碳酸盐( Ca)、丁二烯( Bd)中二聚体( Di)及后处理工艺对 A B S用聚丁二烯胶乳( P B L)的粒子形态等的影响。结果表明, S D S/ D R S增加, P B L平均粒径( Dp)和粒子分散度( Poly d)均减小,且粒子形态趋于规整。 N F/ D R S增大使 Rp 减小,但可以较好地改善 P B L的稳定性。[ Ca]> 1.2% , Dp 显著增大,但使粒子间粘连加重,规整性变差。[ Di]增加使 P B L粒子分布变宽,形态变差。在 100 r/m in 转速下处理 P B L 4 h 可以使 Dp 增大和 Poly d 减少,有利单分散性大粒径的 P B L合成。 相似文献
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SiC(w)/TZP+mullite陶瓷复合材料界面和组成设计与力学性能 总被引:2,自引:1,他引:1
本文从理论上分析了SiC(w)TZP+mullite(p)复合材料界面残余热应力及其在基质内的分布规律。提出在SiC(w)表面涂复Al2O3和在PZT中加入mullite(p)联合作用来降低晶须/基质界面残余热应力的界面设计方案,导出SiC(w)和mullite(p)协同补强PZT的匹配条件。制备了SiC(w)/TZP+mullite(p)复合材料并了SiC(w)表面涂层Al2O3厚度和SiC(w 相似文献
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设P与Q为平面上两个互不相交的凸多边形,则在P与Q之间必存在两条正支撑线 两条斜支撑线,确定它们就可以确定P与Q的凸壳和P与Q的全部可移动方向,这在机器人学、几何布局及VLSI设计等领域具有重要实用意义。本文给出统一确定这些支撑线的快速算法,其时间复杂度为O(logm.logn),其中m与n分别为P与Q的顶点数。 相似文献
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提出了解对称带状Toeplitz矩阵特征值问题的一种新的并行算法。该算法首先将Toeplitz矩阵嵌入到一个更高阶的对称循环矩阵,得到对称循环矩阵特征值之后,采用二分法计算Toeplitz矩阵特征值。新算法的计算复杂性为O(r^3n^2/p),其中n是矩阵维数,r是半带宽,p为处理机台数,并行加速比为O(p)。文中给出了数值实验的结果。 相似文献
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以稻壳为原料是合成SiCw的一个重要方法,本文对VLS机理下SiCw的生长速率控制步骤进行了研究,并以此研制了亲的复合催化剂,提高了生成速率,结果表明,稻壳原料中心SiO2与C在高温下生成SiO的反应不仅是生成SiCp也是生成SiCw的生长速率控制步骤。 相似文献
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在分析SDL语言文法的基础上,构造了SDL/FOP的文法形式,并在SDL/FOP的定义中保持了SDL语言各种语法成分的相互关系,从而证明了SDL语言与离散形式的SDL/FOP是等价的,最后给出了SDL/PR到SDL/FOP转换系统的实现算法。 相似文献
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《International journal for numerical methods in engineering》2018,113(9):1488-1506
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method. 相似文献
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A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa. 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.…… 相似文献
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A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils. 相似文献
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Steffen Müller-Probandt 《材料科学与工程:中英文B版...》2018,(4):161-177
We associate a variety of innovations with the term "Industry 4.0". The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di... 相似文献
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C. Qihong W. Zhan‐Wen J. Yi J. Yehua L. Fei F. Hanguang 《Materialwissenschaft und Werkstofftechnik》2014,45(7):582-590
In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M2(B,C), (W,Mo)2(B,C), M3(B,C), M23(B,C)6 type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm2. The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K1 mill housing of bar mill. 相似文献
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Dimiter Hadjistamov 《材料科学与工程:中英文B版...》2019,(2):56-65
The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ... 相似文献
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Janet Lang 《Materials and Manufacturing Processes》2017,32(7-8):857-866
ABSTRACTThe production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them. 相似文献