新型PITCH—ROLL—YAW关节机构研究

通过双环解耦轴承的设计，解决了ＰＩＴＣＨ－ＲＯＬＬ－ＹＡＷ全方位腕机构运动干涉问题，并进一步设计了一种新型的能够在精确制造下不发生运动干涉的ＰＩＴＣＨ－ＲＯＬＬ－ＹＡＷ关节机构，其中关键技术是双环解耦轴承及转动导轨的设计。该关节机构无奇异现象，可用于机器人拟人壁的肩、腕关节。     

高灵活度仿人臂型七自由度冗余机器人的研究

基于新型ＰＩＴＣＨ－Ｒ０ＬＬ－ＹＡＷ关节，研制出一种高灵活度的新型仿人臂型七自由度冗余机器人系统。文中首先介绍了该机器人的机构与系统构成，然后进一步研究了运动学与工作空间，最后介绍了该机器人的应用前景。     

CONTENTS OF NEW CARBON MATERIALS OF Vol.16

Ｎｏ .1ＲｅｓｅａｒｃｈａｒｔｉｃｌｅｓＳＴＵＤＹＯＮＴＨＥＭＩＣＲＯＷＡＶＥＡＢＳＯＲＢＩＮＧＰＲＯＰＥＲＴＹＯＦＣＯＭＰＯＳＩＴＥＭＡＴＥＲＩＡＬＣＯＮＴＡＩＮＩＮＧＣＡＲＢＯＮＮＡＮＯＴＵＢＥＳ　ＷＩＴＨＮＩＣＯＡＴＩＮＧＳＨＥＮＺｅｎｇ ｍｉｎ　ＺＨＡＯＤｏｎｇ ｌｉｎ(1) :1………………………………………………………………………ＡＮＥＦＦＥＣＴＩＶＥＭＥＴＨＯＤＦＯＲＰＩＴＣＨＣＯＭＰＯＳＩＴＩＯＮＤＥＳＩＧＮＺＨＩＬｉｎ ｊｉｅ　ＳＯＮＧＪｉｎ ｒｅｎ　ＬＩＵＬａｎｇ(1) :5………………………     

稀土络合催化二氧化碳和环氧化物的共聚反应

以稀土络合体系ＲＥ（２０４）３－Ａｌ「Ｃｈ３ＣＨ（ＣＨ３）２」３（ＲＥ＝Ｙ,Ｎｄ,Ｐｒ,ＳＡｍ,Ｄｙ,Ｅｕ）;Ｐ２０４＝（ＲＯ）２ＰＯＯ－,Ｒ＝ＣＨ３（ＣＨ２）３ＣＨ（Ｃ２Ｈ５）ＣＨ２－催化二氧化碳（ＣＯ２）与环氧氯丙烷（ＥＣＨ）无规共聚、合成高分子量的新型聚碳酸酯。同时利用此催化体系对ＣＯ２、ＥＣＨ、环氧树脂（ＥＰ（６１８））进行三元共聚,采用元素分析、红外光谱、广角Ｘ射线衍射及热重分析（ＴＧ）     

我国瓦楞纸箱质量现状

我国瓦楞纸箱质量现状周加彦ＣＵＲＲＥＮＴＳＩＴＵＡＴＩＯＮＯＦＣＯＲＲＵＧＡＴＥＤＰＡＰＥＲＢＯＸＱＵＡＬＩＴＹ￥ＺｈｏｕＪｉａｙａｎＡｂｓｔｒａｃｔ：Ｂａｓｅｄｏｎａｓｕｒｖｅｙｏｎｔｈｅｃｏｒｒｕｇａｔｅｄｂｏｘｍａｎｕｆａｃｔｕｒｅｒｓｎａｔｉ...     

雅马哈GC2020BⅡ2路压缩／限幅器功能与操作

雅马哈ＧＣ２０２０ＢⅡ２路压缩／限幅器功能与操作张沁（１）ＰＯＷＥＲＳＷＩＴＣＨ（电源开关）：设备总开关。（２）ＬＩＮＫＳＷＩＴＣＨ（连接开关）：这个开关用来决定ＧＣ２０２０ＢⅡ是处于双路单声状态，还是处于立体声状态。在双路单声道状态时，通道１和通道...     

添加Al_2O_3对SiC板粒／Y－TZP复合材料力学性能的影响

本文以ＳｉＣ板粒、ＺｒＯＣｌ２－８Ｈ２Ｏ、ＡｌＣｌ３和Ｙ（ＭＯ）３为原料，利用共沉淀和热压烧结工艺，制备ＳｉＣ板粒／Ｙ－ＴＺＰ和（含Ａｌ２Ｏ３）ＳｉＣ板粒／Ｙ－ＴＺＰ复合材料．测试了材料的室温和高温力学性能．研究了添加Ａｌ２Ｏ３对ＳｉＣ板粒／Ｙ－ＴＺＯ复合材料的影响．结果表明，ＳｉＣ板粒／Ｙ－ＴＺＰ复合材料与Ｙ－ＴＺＰ陶瓷相比，其室温强度和韧性出现明显下降，高温强度也没有改善；而在ＳｉＣ板粒与Ｙ－ＴＺＰ复合的基础上，添加Ａｌ２Ｏ３可明显提高材料的强度和断裂韧性，同时，材料的高温强度也获得显著改善．     

紫外线辐照对HDPE结晶结构及化学结构的影响

采用ＤＳＣ、ＷＡＸＤ、元素分析、ＦＴ－ＩＲ、ＥＳＣＡ、ＧＰＣ、交联度和密度测定，研究了紫外线辐照了ＨＤＰＥ的结晶结构及化学结构变化。结果表明，紫外线辐照后，ＨＤＰＥ的熔融温度降低、熔融热焓升高、结晶度增大、晶胞结构未发生变化；ＨＤＰＥ分子甸主了ＣＯＯＨ、Ｃ＝Ｏ、Ｃ－Ｏ、ＯＯＨ、ＯＨ等含氧官能团，分子量降低，分子量分布加宽，基本无交联发生。     

理光XR－X3PF手动聚焦单反相机

理光ＸＲ－Ｘ３ＰＦ手动聚焦单反相机蒋宁在内置自动输片装置的手动聚焦３５ｍｍＳＬＲ中，功能较为齐全的有康泰克斯（ＣＯＮＴＡＸ）１６７ＭＴ、佳能（ＣＡＮＯＮ）Ｔ９０、企能（ＣＨＮＯＮ）ＣＰ—７Ｍ、尼康（ＮＩＫＯＮ）Ｆ—６０１Ｍ、以及理光（ＲＩＣＯＨ）ＸＲ...     

文摘

文摘１混合炸药能量理论的有关知识见（英文）Ｃ９２３０２６６４ＴＡＯＷＣ，ＴＡＲＷＩＲＣＭ，ＯＲＮＥＬＬＡＳＤＬ（ＬａｗｅｒｅｎｃｅＬｉｖｅｒｍｏｒｅＮａｔｉｏｎａｌＬａｂ．，Ｃａｌｉｆｏｒｎｉａ）：Ｐ０９９８ＡＵＳＤＯＥＲｅｐ（ＵＳＡ）［ＵＣＲＬ－Ｊ...     

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.……     

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.     

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.     

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.