微机控制电子吊秤的研制

电子吊秤应用广泛,它可以一次性地完成对物料的装卸和计量工作,是装卸作业实现自动化的必要设备.本文作者在西宁钢厂研制成功两台十吨微机控制电子吊秤,本文对该秤重电路进行了系统分析,并阐述了微机秤重系统的基本原理和设计思想.     

Field Emission of SiCN Thin Films Bombarded by Ar^＋ Ions

SiCN thin films were synthesized by a radio frequency chemical vapor deposition (RFCVD) system on P-type Si (1 0 0) wafers using C2H4, SiH4 and N2 as raw materials.In order to get rid of the oxygen absorbed on the surface and improve the characteristics of electron field emission, Ax^ ions of low energy were used to bombard the samples. The field emission characteristics of SiCN thin films before and after Ar^ bombardment were studied in the super vacuum environment of 10^-6 Pa. It was showed that the turn-on field (defined as the point where the current-voltage curve shows a sharp increase in the current density) decreased from 38 V/μm before bombardment to 25 V/μm after bombardment. And the maximum emission current density increased from 159. 2 to 267. 4 μA/cm^2. The composition before and after Ar^ bombardment was compared using X-ray photoelec-tron spectroscopy (XPS). Our results illustrated that the field emission characteristics were improved after the bombardment of Ar^ .     

职业技术学院数学教学探微

高等职业技术教育是一种全新的高等教学模式,强调理论够用为度,加强实训与实操的教学,其中非数学专业专科层次《高等数学》的教学值得探讨,本文提出一些想法供相关教师参考。     

天津市国有大中型工业企业技术创新现状分析

作为国有经济主体部分的大中型国有企业的技术创新能力反映出国有经济的质量和水平,为此2001年天津市选取具有代表性的电子信息、制药和机电3个行业中的工业企业55个,对其技术创新现状进行调查和对比分析,了解国有大中型企业的技术创新能力,为我市的经济发展提供决策依据.其中医药企业7个,电子仪表企业20个,机电企业28个;特大型企业1个,大一型企业8个,大二型企业19个,中一型企业13个,中二型企业 14个.     

喜看“稻菽”千重浪—上海工博会技术产权交易展区巡礼

万众瞩目的2002年第四届上海国际工业博览会已经胜利结束了,作为此次盛会的参展商之一,特别是作为技术、金融、产业与资本嫁接桥梁的主力和“国家队”,上海技术产权交易所取得了不凡的业绩。 技产展区 历史之最 据统计,此次上海技术产权交易所率团参展的单位达到了历史性的93家,共计72个展位,展览面积1000平方米,创