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对CHN-O-RAPID元素分析仪的进样部件作了改装,使仪器可以手动注射进样,采用手动注射进样高温分解法测定了新标准汽油中的氧含量,分析结果偏差符合ATSM D 5622方法的要求。 相似文献
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针对国产便携式质谱仪在维持真空条件下提高进样效率的问题,研究了膜连续进样和脉冲进样技术。利用实验室组装的膜连续进样和脉冲进样装置,使用二甲苯标气开展了在不同膜温、不同进样流量、不同脉冲频率条件下的进样实验;利用国内厂家生产的膜替换Hapsite用进样阀中的膜,在相同膜温和不同进样流量条件下对比分析了两种膜的性能。结果表明:提高膜温度、增大进样流量可以有效提高便携式质谱仪的离子流信号强度,缩短响应时间和减少峰拖尾现象;在膜温度不变的条件下,增大进样流量可以有效地缩小两种膜性能之间的差距;采用脉冲进样时,随着脉冲电压频率的增大,既可以有效地保持仪器的真空度,又可以提高离子流信号强度、缩短响应时间。 相似文献
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利用甲基硅氧烷色谱柱(HP-PONA)分离,氢火焰检测器(FID)检测,根据碳九组份的理化性质,结合不同进样气化室温度的变化分析,探讨了气化室温度的高低对色谱分离和定量结果的影响,分析数据更能接近实际生产过程。 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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我公司于80年代末引进Aspera公司年产80万台冰箱(冷柜)压缩机生产线及软件技术,在压缩机加工中,活塞销孔(如图1所示)的加工是难点之一。用镗床加工,质量一直难以达到要求,废品率很高。后来我们将Aspera公司的加工工艺即精镗后滚光改为精镗后用金刚石铰刀粗、精铰孔,由此解决了这个技术难题。(1)原意大利Aspera公司工艺简述其工艺流程为:钻6.5通孔→扩孔至7+0.1→粗镗7.473+0.036、圆柱度0.01→精镗至7.935+0.006、圆柱度0.002→滚光7.938+0.006、圆柱度0… 相似文献
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根据广州市珠江新城旅客自动运输系统(APM)列车的运行特点,介绍APM列车制动系统的制动方式及其特点,分析APM列车动态制动和摩擦制动的工作机理及其区别和联系,阐明APM列车制动系统的电控制过程和气控制过程,从而为APM列车制动系统的维护和管理提供一定的依据. 相似文献
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三爪自定心卡盘作为机床的主要附件,已有一百多年的发展历史,尽管目前随着数控技术的不断发展,越来越多地需求高速动力卡盘,但三爪自定心卡盘目前仍有一定的市场。 要保证卡盘可靠地夹紧工件,必须使其有可靠的夹持精度;要保持卡盘的精度,必须要严格控制各零部件公差及误差,如盘丝的极心偏。 极心偏是形成圆的渐开线的基圆圆心 (极心 )与盘丝内孔中心不同心所造成的偏差值。它对卡盘精度的影响分两种情况,一是卡爪夹持弧采用配磨,二是卡爪夹持弧采用单磨。本文主要探讨配磨时的影响。 卡爪夹持弧采用配磨,即每台卡盘整体… 相似文献
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The article presents a brief review of the wear models based on the kinetic thermofluctuation approach. The materials were developed using SamGTU sclerometric programming software and a set of instruments developed at Samara Engineering University for assessing the parameters of kinetic thermoactivation for surface fracture deformed by friction. The first obtained results of assessments and the estimated prediction of wear resistance exemplified by tribocouple of the aircraft chassis are presented. 相似文献
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详细分析了圆柱面素线的直线度公差带在新旧标准中定义和解释的区别,并从对圆柱面素线实际要素检测的角度,提出了推行新标准的实际意义。 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献