PP三元共混合金的力学性能及结晶行为研究

研究了不同乙烯含量的ＥＰＤＭ对ＰＰ／ＵＨＭＷＰＥ合金的增容作用,并讨论了共混体系结晶行为的变化情况。发现ＥＰＤＭ中乙烯含量的增加可提高增容效果;在ＰＰ／ＵＨＭＷＰＥ／ＥＰＤＭ为１００／１０／６时,共混物缺口冲击强度可达９１．１ｋＪ／ｍ＾２,为ＰＰ的３．５倍,此时拉伸强度仍比纯ＰＰ高４．３ＭＰａ。     

三维碳化硅/碳化硅陶瓷基编织体复合材料

采用化学气相浸渗法（ＣＶＩ）,制备出三维Ｈｉ－ＮｉｃａｌｏｎＳｉＣ／ＳｉＣ陶瓷基编织体复合材料．经３０ｈ ＣＶＩ致密化处理后,复合材料的密度达到 ２５９·ｃｍ－３,所研制的三维 ＳｉＣ／ＳｉＣ复合材料不仅具有较高的强度,而且表现出优异的韧性和类似金属材料非灾难性的断裂特征．复合材料的主要力学性能指标为：弯曲强度 ８６０ＭＰａ,断裂位移 １．２ｍｍ,断裂韧性４１．５ＭＰａ·ｍ１／２,断裂功２８．１ｋＪ·ｍ－２,冲击韧性３６．０ｋＪ·ｍ－２．     

MAGNETIC PROPERTIES AND APPLICATIONS OF NEWLY-DEVELOPED NANOCRYSTALLINE Fe_(73.5)Cu_1Nb_2V_1Si_(13.5)B_9 ALLOY

报道了新开发的纳米晶Ｆｅ７３．５Ｃｕ１Ｎｂ２Ｖ１Ｓｉ１３．５Ｂ９合金的综合软磁性能。新合金的高频铁损水平为：Ｐ３／１００ｋ＝５１０ｋＷ·ｍ－３，Ｐ２／２００ｋ＝７４８ｋＷ·ｍ－３，Ｐ２／５００ｋ＝３６７１ｋＷ·ｍ－３和Ｐ０．５／１０００ｋ＝８７１ｋＷ·ｍ－３。新合金的铁损比早期开发的纳米晶Ｆｅ－Ｃｕ－Ｎｂ－Ｓｉ－Ｂ合金的低且明显低于优良的功率Ｍｎ－Ｚｎ铁氧体Ｈ７ｃ４的铁损。对铁损与频率和幅值磁通密度的关系进行了分析。也报道了新合金在若干方面的实际应用。     

Sm8Fe83Si2C5Cu0.5Nb1.5非晶合金的晶化动力学

用差热分析（ＤＴＡ）,结合Ｘ射线衍射（ＸＲＤ）研究了Ｓｍ８Ｆｅ８３Ｓｉ２Ｃ５Ｃｕ０．５Ｎｂ１．５非晶合金的晶化动力学。结果表明：温度在０￣１０００℃范围内,该合金的晶化相为α－Ｆｅ和Ｓｍ２（ＦｅＳｉ）１７Ｃｘ,α－Ｆｅ相的晶化表观激活能力３４９．５３ｋＪ／ｍｏｌ,Ｓｍ２（ＦｅＳｉ）１７Ｃｘ的晶化表观激活能力３１６．１９ｋＪ／ｍｏｌ,两相在晶化初期激活能量小,随晶化量（ｘｃ）的增加激活能增大,当α－     

Fe73.5Cu0.8Nb2V1.2Si11.5B11新型纳米晶合金的研究

报道了Ｆｅ７３５Ｃｕ０８Ｎｂ２Ｖ１２Ｓｉ１１５Ｂ１１新型纳米晶合金的研究结果。透射电镜和穆斯堡尔谱研究表明，合金经８４３Ｋ，０５ｈ真空退火，形成由平均晶粒尺寸为１８ｎｍ左右的αＦｅ（Ｓｉ）相（～７８％）和剩余非晶组成的显微结构。合金的饱和磁感应强度为１４Ｔ，ｆ＝１ＫＨｚ时最大有效磁导率（μｅ）为７１８×１０－３Ｈ／ｍ，Ｐ１２／２ｋ２１ｋＷ／ｍ３，Ｐ１１／１０ｋ２１８ｋＷ／ｍ３，Ｐ０５／２０ｋ１５７ｋＷ／ｍ３，Ｐ０２／１００ｋ３００ｋＷ／ｍ３，矫顽力Ｈｃ≈１１Ａ／ｍ。合金具有明显的磁场处理效果，经纵向和横向磁场退火后，其Ｂ３０、α３０分别为１４４Ｔ，０９０和１３０Ｔ、０１。与Ｆｅ７３５Ｃｕ１Ｎｂ３Ｓｉ１３５Ｂ９相比，由于用Ｖ代替了部分Ｎｂ，提高了熔体流动性，改善了快淬合金带材的机械特性，降低了成本。     

曝光时对DCG中Cr2P3／2XPS谱的影响的研究

通过对不同曝光量的重络酸盐明胶（ＤＣＧ）中的Ｃｒ２Ｐ３／２ＸＰＳ（Ｘ射线光电子能谱）的测定发现，Ｃｒ２Ｐ３／２ＸＰＳ谱随曝光量呈规律性的变化；在０￣１９５ｍＪ／ｃｍ＾２曝光量范围内，它的１／５高密度（ＦＷＦＭ，即：ｔｈｅ ｆｕｌｌ ｗｉｄｔｈ ａｔ ｆｉｆｔｈ ｍａｘｉｍｕｍ）和５７６．４ｅＶ附近的峰的相对强度先随曝光量的增加而减小；相反，它的５７９．４ｅＶ和５７７．４ｅＶ附近的两个峰的相对强度却     

高性能2.5Gb／s用的DFB—LD／EA单片集成器件

报导了采用全ＭＯＣＶＤ生长的１．５５μｍ的单片集成ＤＦＢ＝ＬＤ／ＥＡ组件的 在ＤＷＤＭ系统上的传输测试结果，出纤功率Ｐｆ≥２．５ｍＷ＠Ｉｆ＝７５ｍＡ，边模抑制比ＳＭＳＲ〉３５ｄＢ，调制器反向偏压为２．５Ｖ时的消光比为１４ｄＢ，该发射模块在２．５Ｇｂ／ｓＤＷＤＭ系统上进行了传输试验，传输２４０Ｋｍ后无误码，其通道代价≤１ｄＢ＠ＢＥＲ＝１０＾－１２。     

PS／粉末SBR—g—S共混体研究：Ⅱ.粉末SBR—g—S的相结构 …

测定了ＳＢＲ－ｇ－Ｓ的接枝率,用ＴＥＭ检测了粉末ＳＢＲ－ｇ－Ｓ（ＰＲ）的相结构。用ＤＳＣ测定了ＰＳ／ＰＲ共混体的Ｔｇ,研究了ＰＳ／ＰＲ共混体的相容性。结果发现,在接枝率为３２．６％的粉末非交联ＳＢＲ－ｇ－Ｓ（ＰＲ１）的相结构中ＳＢＲ为连续相,在连续相中均匀分布着直径约０．０１μ的ＰＳ微区;ＰＳ为细胞状分散相,粒径１～５μｍ,分散相含有ＳＢＲ包藏物。在接枝率为８．５％的粉末交联ＳＢＲ－ｇ－Ｓ（ＰＲ２     

PVC／CEVA共混体系相容性研究

采用ＤＳＣ对ＰＶＣ／ＣＥＶＡ溶液共混物的玻璃化转变进行了研究。结果表明，对ＣＥＶＡ／ＰＶＣ质量比分别为１：９、２：８、４：６、８：２的共混体系，各共混物均分别出现一个明显的玻璃化转变温度，表明ＶＡｃ质量含量为５．９％，但氯含量为５８％的ＣＥＶＡ与ＰＶＣ具有较好的相容性，这是ＣＲ－ＭＭＡ－ＣＥＶＡ接枝共聚物对增塑ＰＶＣ人造革显示出较高粘合性能的主要根源。     

废硫化胶粉增韧BMC的实验研究

本文以废硫化胶粉（ＲＰ）作为活性填料来改性不饱和聚酯团状模塑料（ＢＭＣ），系统研究了配方、工艺等因素的影响，以及ＲＰ的增韧作用。结果表明，增韧效果与ＲＰ的预处理工艺、种类、填充量、粒径有关。当单体／ＲＰ＝５０／５０，ＲＰ粒径为０．２８ｍｍ，填充量为２０ｐｈｒ时，ＢＭＣ的冲击强度从５．２ｋＪ／ｍ２提高到１１．４ｋＪ／ｍ２，固化收缩率从０．５％下降至０．１％，而其他物理机械性能基本保持不变。透射电镜、电子探针测试证明，ＲＰ与ＢＭＣ基体在相界面附近能够形成梯度ＩＰＮ，加强了两相界面结合，使冲击强度提高。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

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.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

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.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

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.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

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.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

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.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.