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1.
IEC/TC中国代表团 《仪器仪表标准化与计量》2006,(1):1-2
2005年11月30日~12月2日,SC65C/MT9/HA“高可用性自动化网络”工作组会议在美国菲尼克斯召开。MT9/HA于2005年9月成立,主要致力于研究使用冗余技术设计基于以太网的高可用性自动化网络标准。标准将定义拓扑、网络和定时参数规范,以及基于环型拓扑的高可用性自动化网络通信协议。 相似文献
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2006年7月18日~7月21日,IECSC65C/MT9/HA“高可用性自动化网络”第三次工作组会议在挪威奥斯陆召开。MT9/HA于2005年9月成立,主要致力于研究使用冗余技术设计基于以太网的高可用性自动化网络标准,标准的主要内容是定义基于IEC/ISO8802—3网络的冗余规范和定时参数规范,以及基于高可用性自动化网络的通信协议。 相似文献
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《仪器仪表标准化与计量》2006,(6):I0010-I0011
行业动态行业资讯…………………………………………………(01~06-Ⅰ)官方发布2006年机械工业标准化工作要点……………………………………………………………(03-1)TC124专栏第三届全国工业过程测量和控制标准化技术委员会及工业通信(现场总线)及系统分技术委员会第四次全体委员会议纪要……………………………………………………………(06-1)国际标准化IECSC65C/MT9/HA高可用性自动化网络工作组会议(美国)纪要……………………………………………………………(01-1)IECSC65C/MT9、WG11现场总线及实时以太网工作组会议(美国)纪要… 相似文献
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上海液压泵厂在引进德国海卓玛蒂公司制造技术基础上,于91年承担了“八五”重点企业技术开发项目──A6VM/60系列科轴式变量柱塞马达的新产品研制下,开发小批产的任务。在北京自动化所协作下经三年九个月的辛勤耕耘,从设计、工艺、工装、试制、试验和成功地研制出了A6VM/60系列外轴式变量柱塞马达等五种规格的产品:A6VM55HA2/60、A6VM80HA2/60、A6VM80HD/60、A6VM107EZ/60、A6VM107HA/60,并于95年10月9日在上海液压泵厂通过部级鉴定。代表产品A6VM80HA/60的性能参数为:排量80ml/r,转速1800~3000r/min,压… 相似文献
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SCC/MT中国专家组 《仪器仪表标准化与计量》2007,(2):1-2,28
2007年1月21日~29日,IEC/SC65C/MT9与WG11联合工作组会议在法国Pauilac小镇召开,来自24个总线开发公司和组织的32名专家参加了本次会议。 相似文献
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高可用自动化网络 总被引:1,自引:0,他引:1
华镕 《仪器仪表标准化与计量》2010,(2):19-24
本文通过高可用性网络的基本概念和几种高可用性网络冗余协议的工作原理,对高可用性网络技术作了简要介绍。 相似文献
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IEC/TC中国代表团 《仪器仪表标准化与计量》2006,(1):2-3
2005年12月5日~12月9日,IEC SC65C/MT9(现场总线维护工作组)和WG11(实时以太网工作组)联合会议在美国菲尼克斯召开。来自世界各大总线组织的技术专家32人参加了本次会议,共同研究制定两个国际标准IEC61158现场总线(第四版)和IEC61784-2实时以太网。我国专家:浙江大学冯冬芹教授、中科院沈阳自动化所徐皑冬研究员和SAC/TC124/SC4梅恪秘书长参加了本次会议。会议asc65c技术总协调人Tom Phinney和WG11的发起人Winkel共同主持。 相似文献
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J. Campa-Molina† O. Blanco† A. Correa-Gomez M. Czank‡ & A. G. Castellanos-Guzman 《Journal of microscopy》2002,208(3):201-211
The domain structures of Zn3B7O13Cl, Zn3B7O13Br and Zn3B7O13I boracite single crystals were studied by means of polarized light in conjunction with electron microscopy. Single crystals of the three compositions were grown by chemical transport reactions in closed quartz ampoules, at a temperature of 900 °C and were examined by polarizing optical microscopy (PLM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For both PLM and SEM, the same as‐grown samples were used without having to resort to metallization of the crystal faces. For TEM the single crystals were crushed and mounted on holey carbon films. Comparative electron microscope images were useful for revealing the domain structure of these ferroelectric/ferroelastic materials previously observed between the crossed polars of an optical microscope. X‐ray diffraction analysis of the pulverized crystals was performed for this triad of halogen boracites containing zinc as a common metal. 相似文献
12.
Stress intensity factors for pairs of diametrically opposite radial cracks on the inside of a jacketed pressurized hole in a thick cylinder have been calculated by using finite element technique. Burst tests on thick cylinder rock samples under above conditions have been performed and the KIC values for Antrim Shale and Limestone determined. The method is very convenient for rocks whose samples are often available in form of cylindrical bars drawn as cores from underground drilling. 相似文献
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基于太赫兹光谱的人参和西洋参鉴别 总被引:1,自引:0,他引:1
为了快速区分人参和西洋参,依据两者所含的人参皂苷在太赫兹波段具有不同指纹光谱,提出了一种基于人参皂苷的太赫兹光谱鉴别人参和西洋参的方法。采用MATLAB软件识别人参和西洋参的太赫兹光谱,同时根据太赫兹光谱特征并通过标准的主成分分析(PCA)区分出人参、西洋参。实验结果表明,基于太赫兹光谱的主成分分析可精确区分出人参、西洋参,并且还可以应用于其他类似物质的区分中。 相似文献
15.
R.B. Zipin 《Precision Engineering》1990,12(2)
European manufacturers have proposed a set of surface roughness parameters based on an examination of the variation in slope of the bearing ratio curve of a surface profile. It is shown, that the proposed procedure provides no useful information, and indeed is misleading, since the bearing ratio curve of even a normally-distributed random surface profile exhibits the expected variation in slope when plotted on rectangular coordinates. On the other hand, the desired information is readily obtained by a similar examination of the cumulative height distribution of a surface profile (the unity complement of the bearing ratio) when it is plotted on normal probability coordinates. 相似文献
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An Al86 Mn3 Be11 alloy cast into copper mould was subjected to metallographic investigation. The as-cast microstructure consisted of a quasicrystalline icosahedral phase (i-phase), Be4 AlMn phase and, occasionally, a hexagonal phase. Al-rich solid solution represented the dominant phase. The chemical compositions of phases were determined using AES. The composition of the Be4 AlMn slightly deviated from the stoichiometric composition, whereas the composition of the i-phase was approximately Al52 Mn18 Be30 , containing an appreciable amount of Be. The average composition of the hexagonal phase was Al66 Mn21 Be13 . Deep etching and particle extraction provided a deep insight into the three-dimensional morphology of the i-phase and the hexagonal phase, whereas Be4 AlMn was slightly attacked by the etchant. The i-phase was present predominantly in the form of dendrites and a rodlike eutectic phase. The hexagonal phase was primarily in the form of hexagonal platelets, whereas Be4 AlMn was rather irregular in shape. The morphology of the i-phase can be explained by predominant growth in 3-fold directions and the lowest energy of the 5-fold planes, leading to the faceting and adopting a pentagonal dodecahedron shape. The brightnesses of phases in the backscattered electron images were rationalized by determining their backscattering coefficients. TEM investigation showed considerable phason strain in the i-phase, and the polycrystalline nature of the Be4 AlMn phase. 相似文献
18.
Ali Asadi Ali Sadough Vanini Amin Jabbari 《Journal of Mechanical Science and Technology》2011,25(9):2179-2184
Lightweight laminated composites containing a ceramic front layer and a metallic backing layer were used in order to protect
people, moving equipment, and mobile vehicles from high velocity impact and the increased mobility of mobile vehicles. In
this study, by adding10 vol% SiC and 500 ppm MgO nanoscale particles on the microstructure of Al
2
O
3 matrix and applying optimum sintering conditions, ceramic performance against high-speed projectile impact was improved.
To perform this investigation, a number of target samples with two different types of front layers (alumina and Al
2
O
3-SiC-MgO nanocomposite ceramic) were produced. Impact tests were conducted on these samples using 7.62 mm projectiles with a velocity
of 820 ± 15 m/s. The amount of bulge and bending of the backing layer caused by impact tests was measured. The results of
the impact tests on the samples made of Al
2
O
3-SiC-MgO nanocomposite ceramics and alumina were also compared and analyzed. The results indicate that the substitution of Al
2
O
3-SiC-MgO ceramic layer — which is proffered in this paper — instead of pure alumina ceramic layer, decreases the areal-density of
the samples by at least 30% and improves mechanical properties by about a 60% increase in flexural strength and 100% growth
of the energy distribution factor, which impressively increases impact energy absorption. 相似文献
19.
Crack/particle interactions in alumina/silicon carbide nanocomposites have been investigated by scanning electron microscopy and transmission electron microscopy, with cracks induced by Vickers microindentation. Intergranular cracks are frequently deflected into grains by SiC particles on grain boundaries inclined to the average direction of crack propagation. This mechanism is proposed to explain the change in the fracture mode from intergranular fracture for monolithic alumina to predominantly transgranular fracture for the nanocomposites. Neither stress-induced microcracking around SiC particles nor significant crack deflection by intragranular particles was found to occur in the nanocomposites. It is argued that an addition of nanoparticles may not be a promising approach for increasing the toughness of alumina. 相似文献
20.
I. I. Smolyaninov H. Y. Liang C. H. Lee C. C. Davis V. Nagarajan† & R. Ramesh† 《Journal of microscopy》2001,202(1):250-254
Near-field optical second harmonic microscopy has been applied to imaging of the c/a/c/a polydomain structure of epitaxial PbZr x Ti1– x O3 thin films in the 0 < x < 0.4 range. Comparison of the near-field optical images and the results of atomic force microscopy and X-ray diffraction studies show that an optical resolution of the order of 100 nm is achieved. Symmetry properties of the near-field second harmonic signal allow us to obtain good optical contrast between the local second harmonic generation in c- and a-domains. Experimentally measured near-field second harmonic images have been compared with the results of theoretical calculations. Good agreement between theory and experiment is demonstrated. 相似文献