全国填料与静密封标准化技术委员会与全国锻压机械标准化技术委员会液压机分技术委员会成立

2008年4月,国家标准委以国标委综合[2008]54号文、[2008]68号文分别批复成立全国填料与静密封标准化技术委员会、全国锻压机械标准化技术委员会液压机分技术委员会,其编号分别为SAC／TC350、SAC／TC220／SC3。     

关于成立全国工业过程测量和控制标准化技术委员会分析仪器分技术委员会(SAC/TC124/SC6)的批复

2005年3月14日国家标准化管理委员会办公室发标委办计划[2005]28号文关于成立全国工业过程测量和控制标准化技术委员会分析仪器分技术委员会(SAC/TC124/SC6)的批复。为了使更多的单位和企业了解和支持标委会的工作,本刊全文刊登批复内容。     

全国机床数控系统标准化技术委员会成立

国家标准化管理委员会日前致函湖北省质量技术监督局,对该局《关于成立全同机床数控系统标准化技术委员会的函》作出正式批复,同意成立全国机床数控系统标准化技术委员会,编号为SAC／TC367。     

全国工业过程测量和控制标准化技术委员会控制仪表及装置、工业控制计算机系统分技术委员会（TC124／SC2）2005年会会议纪要

全国工业过程测量和控制标准化技术委员会控制仪表及装置、工业控制计算机系统分技术委员会（SAC／TC124／SC2）2005年会于2005年7月27～29日在浙江中控技术股份有限公司联合召开了2005年度全体会议。参加SC2年会的有关专家和委员共30人。会议由SAC／TC124／SC2主任委员西南大学计算机与信息科学学院副院长刘枫教授主持。     

全国工业过程测量和控制标准化技术委员会可编程序控制器及系统分技术委员会（TC124／SC5）2005年会会议纪要

全国工业过程测量和控制标准化技术委员会可编程序控制器及系统分技术委员会（TC124／SC5）2005年年会干2005年7月2713~2913在杭州中控科技园召开。有16名委员代表出席了本次会议。     

全国工业过程测量和控制标准化技术委员会分析仪器分技术委员会成立

全国工业过程测量和控制标准化技术委员会分析仪器分技术委员会(SAC／TC124／SC6)成立大会暨国家标准审查会于2005年6月26～29日在北京召开。参加本次会议的委员会委员、顾问、特邀代表、标准起草人共计44人。     

全国机床数控系统标准化技术委员会在武汉成立

记者6月3日从国家质检总局了解到,国家标准化管理委员会日前致函湖北省质量技术监督局,对该局《关于成立全国机床数控系统标准化技术委员会的函》作出正式批复,同意成立全国机床数控系统标准化技术委员会,编号为SAC／TC367。     

关于调整全国工业过程测量和控制标准化技术委员会及分技术委员会委员的批复

2006年3月9日国家标准化管理委员会办公室发标委办计划[2006]21号文关于调整全国工业过程测量和控制标准化技术委员会及分技术委员会委员的批复，为了使更多的单位和企业了解和支持标委会的工作，本刊全文刊登批复内容。[编者按]     

全国建筑施工机械与设备标准化技术委员会成立

近日,国家标准化管理委员会以国标委综合[2008]5号文批复了中国机械工业联合会上报的全国建筑施工机械与设备标准化技术委员会组成方案,其编号为SAC／TC328。该委员会由40名委员组成,长沙中联重工科技发展股份有限公司刘权任主任委员,北京建筑机械化研究院李静任委员兼秘书长,秘书处承担单位为北京建筑机械化研究院。该委员会主要负责包括基础施工设备、混凝土机械、道路施工与养护设备、骨料加工机械和设备、钢筋加工设备和模板、装修和维护设备（包括高处作业吊篮和擦窗机）及其它常用机械与设备领域的标准化工作,对口国际标准化组织建筑机械和设备技术委员会（ISO／TC195）。     

2007年ISO／TC96起重机技术委员会系列会议报道

2007年ISO／TC96起重机技术委员会系列会议，于2007年5月28日至6月2日在北京国际会议中心召开，会议由ISO／TC96起重机技术委员会主办，由国家标准化管理委员会（SAC）承办，由全国起重机械标准化技术委员会（SAC／TC227）、北京起重运输机械研究所和国家起重运输机械质量监督检验中心协办。[第一段]     

GT/CAD/CAPP/PDM/ERP系统集成研究

研究ETO生产方式下以成组技术为基础的CAD/CAPP/PDM/ERP的集成方法,包括面向CAD/CAPP/PDM/ERP的集成的成组信息编码,基于成组编码的CAD/PDM集成、CAPP/PDM集成和PDM/ERP集成.提出了基于成组技术的CAD/CAPP/PDM/ERP集成框架,研究了贯穿于CAD、CAPP、PDM与ERP系统的统一的成组编码方案和信息编码方案.     

Cylindrical specimens for KIC of rocks

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 K_IC 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.     

Analysis of the Rk surface roughness parameter proposals

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.     

基于太赫兹光谱的人参和西洋参鉴别

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。     

机械加工与自动化

分析了目前机械制造企业的CAD/CAX应用概况,提出了一种面向企业的CAD/CAM/CAPP/PDM/ERP系统的集成框架和实施内容,以适应现代企业的需要.     

Near-field second harmonic imaging of the c/a/c/a polydomain structure of epitaxial PbZrxTi1–xO3 thin films

Near-field optical second harmonic microscopy has been applied to imaging of the c/a/c/a polydomain structure of epitaxial PbZr _x Ti_{1– 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.     

Electron and light microscopy studies on the domain structures of Zn3B7O13Cl, Zn3B7O13Br and Zn3B7O13I ferroic boracites

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.     

Characterization of cast Al86Mn3Be11 alloy

An Al₈₆Mn₃Be₁₁ alloy cast into copper mould was subjected to metallographic investigation. The as-cast microstructure consisted of a quasicrystalline icosahedral phase (i-phase), Be₄AlMn 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 Be₄AlMn slightly deviated from the stoichiometric composition, whereas the composition of the i-phase was approximately Al₅₂Mn₁₈Be₃₀, containing an appreciable amount of Be. The average composition of the hexagonal phase was Al₆₆Mn₂₁Be₁₃. Deep etching and particle extraction provided a deep insight into the three-dimensional morphology of the i-phase and the hexagonal phase, whereas Be₄AlMn 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 Be₄AlMn 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 Be₄AlMn phase.     

Electron microscopy of crack/particle interactions in Al2O3/SiC nanocomposites

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.     

Investigation on the impact behavior of Al2O3-SiC-MgO nanoceramic/metal laminated composite

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.