【摘 要】
：
Based on piezoelectric ultrasound technology,the paper theoretically analyses the determination of gas concentration and presents a norm-contrast method,which i
论文部分内容阅读
Based on piezoelectric ultrasound technology,the paper theoretically analyses the determination of gas concentration and presents a norm-contrast method,which is realized by high-speed chip CPLD (Complex programmable logic device),to determine the concentration of SF_6 accurately with air as background.It is proved that this sensor can determine the concentration of SF_6 with the precision of 50μg/g.The sensor is in the process of producing.
Based on piezoelectric ultrasound technology, the paper theoretically analyzes the determination of gas concentration and presents a normal-contrast method, which is realized by high-speed chip CPLD (Complex programmable logic device), to determine the concentration of SF_6 accurately with air as background .It is certain that this sensor can determine the concentration of SF_6 with the precision of 50 μg / g. The sensor is in the process of producing.
其他文献
外因性哮喘的主要原因是平滑肌的痉挛,肥大细胞颗粒减少及淋巴细胞的作用。由于这三种因素使游离的钙离子流入细胞内。有报告硝苯吡啶对上述三种因素有影响作用。从实验中硝
加入WTO多年了,我国文献中的数字要不要与国际接轨?恐怕没有人会说:“不必”。1994年6月1日,《文化部出版局、国家计量局贯彻〈中华人民共和国法定计量单位〉的联合通知》中
以减压式持续地将钢筒内的CO_2注入密闭的麻醉器中,对淡包库蚊进行麻醉研究。结果:麻醉时间的长短与恢复率的高低成反比;麻醉后的恢复率,在浅度麻醉下,雄蚊较敏感,与雌蚊有显
An optimal motion planning scheme based on the quasi-Newton method is proposedfor a rigid spacecraft with two momentum wheels. A cost functional is introduced
十五大以来，小型企业迅速增加，其纳税问题也日渐突出。目前，增值税小规模纳税人与一般纳税人之间，由于税金抵扣问题，造成税负差别比较大，容易产生税收歧视，不利于公平竞争。如何解决
Constipation is a common gastrointestinal complaint in clinical practice,affecting an estimated 27% of the population.Many patients are disappointed by current
安宁及其制剂和泛酸钙,经降解成相应的铵盐,两者于浓碱存在下均逸出 NH_3,可用氨气敏电极测定。在1×10~(-4)～1×10~(-2)mol/L 浓度范围内,校正曲线呈线性,所测得结果与凯氏定
（一）产权制度相关理论１．产权与产权制度的概念。对“产权”一词，我国的经济理论界至今也没有得出一个能够让人们普遍接受的概念。依笔者之见，“产权”系指经济人（即从事经济活动或者
21世纪即将到来,加快中西部发展,缩小过大的地区间差距,已成为我国经济整体战略目标实现的关键问题,借鉴国际经验,选择加快发展的政策,是一个时不我待的研究课题.本文试就财
随着阿司匹林的新用途的发现,越来越多的证据表明阿司匹林能引起许多副作用。有时可以到达严重的程度。许多副作用是属于胃肠方面。广告上说:“纯一的阿司匹林常能损君之胃