气相色谱在线分析变压吸附法制纯氢中的总碳

利用带镍加氢转化炉的气相色谱仪 ,在线分析变压吸附法制纯氢中的总碳。该法用变压吸附法制的纯氢作燃气 ,在检测器前端将氢气中的CO和CO2 转化为CH4,然后用氢火焰离子化检测器检测 ,直接以检测器的信号 (mV)进行定量。当氢气中总碳体积分数在 1 9～ 5 0 0 μl/L时 ,FID信号值与总碳体积分数有良好的线性关系。方法回收率为 99 90 %～ 10 1 9%,相对标准偏差 <1%。     

分光光度法测定黄磷尾气中总磷

实验研究了溴化硝酸吸收－分光光度法测定黄磷尾气中总磷含量的方法，总磷回收≥97%,方法检测限可达0.2μg/mL.     

小型全内腔脉冲Ar~＋激光管的研制

介绍一种小型全内腔脉冲Ａｒ＋激光管的设计和结构。并对不同阴极，放电管直径，激励电压及Ａｒ气压等对输出功率及激光管寿命的影响作了一系列的实验，试制出结构简单，使用方便，价格便宜的有一定实用价值的小型全内脏脉冲Ａｒ＋激光管。     

LabWare树立全球LIMS的典范

本文站在技术和应用的角度，简要介绍美国LabWare公司LIMS产品的功能，对其特点进行分析，其中，该系统的先进性和可组态性，实施的准时、概算的可控制，以及成功的业绩，对中国的用户将具有很大的吸引力。     

Effects of storage time and chemical preservatives on the total volatile basic nitrogen content in chilean mackerel (Trachurus murphy) prior to fish meal production

Total volatile basic nitrogen (TVB-N) as a measure of protein degradation and total microbial counts or stored raw mackerel (Trachurus murphy), which had been treated with chemical preservatives, were compared with the TVB-N and microbial counts of untreated fish. In unpreserved fish, decomposition of fish protein was rapid. Treatment of mackerel with acetic (1000-5000 μg kg^?1), which was the most effective of the parameters studied, approximately halved the rate of increase in TVB-N compared with the untreated samples. Changes in the total microbial counts presented a similar trend.     

大规模集成电路浮栅ROM器件总剂量辐射效应

提出了一种大规模集成电路总剂量效应测试方法:在监测器件和电路功能参数的同时,监测器件功耗电流的变化情况,分析数据错误和器件功耗电流与辐射总剂量的关系.根据该方法利用60Co γ射线进行了浮栅ROM集成电路(AT29C256)总剂量辐照实验,研究了功耗电流和出错数量在不同γ射线剂量率辐照下的总剂量效应,以及参数失效与功能失效时间随辐射剂量率的变化关系,并利用外推实验技术预估了电路在空间低剂量率环境下的失效时间.     

Characterization of edible oils,butters and margarines by Fourier transform infrared spectroscopy with attenuated total reflectance

The combination of attenuated total reflectance (ATR) and mid-infrared spectroscopy (MIRS) with statistical multidimensional techniques made it possible to extract relevant information from MIR spectra of lipid-rich food products. Wavenumber assignments for typical functional groups in fatty acids were made for standard fatty acids: Absorption bands around 1745 cm⁻¹, 2853 cm⁻¹, 2954 cm⁻¹, 3005 cm⁻¹, 966 cm⁻¹, 3450 cm⁻¹ and 1640 cm⁻¹ are due to absorption of the carbonyl group, C−H stretch, =CH double bonds of lipids and O−H of lipids, respectively. In lipid-rich food products, some bands are modified. Water strongly absorbs in the region of 3600–3000 cm⁻¹ and at 1650 cm⁻¹ in butters and margarines, allowing one to rapidly differentiate the foods as function of their water content. Principal component analysis was used to emphasize the differences between spectra and to rapidly classify 27 commercial samples of oils, butters and margarines. As the MIR spectra contain information about carbonyl groups and double bonds, the foods were classified with ATR-MIR, in agreement with their degree of esterification and their degree of unsaturation as determined from gas-liquid chromatography analysis. However, it was difficult to differentiate the studied food products in terms of their average chainlength.     

银川市室内环境空气污染现状及治理措施的初探

本文通过对银川市室内环境空气污染现状的调查与检测,阐述了室内环境空气污染的来源及危害,提出了污染治理措施。     

塔巴庙区块气层录井参数分析研究

塔巴庙区块气藏属于低压、低渗气藏,储集层物性差异大、含气级别高,但含气非均质性强,录井解释评价困难。针对这一问题,开展了综合判断储集层物性和含气性方面的研究,分别探讨了钻时与全烃、钻井液性能与全烃、钻井液粘度与全烃、气测显示与测井参数和烃组分与气显示之间的关系,分析了其相关性及其在塔巴庙区块气层解释评价中的意义及作用。通过相关性研究,不但摸索出定性解释评价气层的方法,同时为今后深入研究录井相关参数关系,探索其内在规律,为实现准确解释评价储集层奠定了基础。     

合成十二烷基葡萄糖苷的工艺条件

采用对甲苯磺酸为催化剂 ,以D 葡萄糖和正十二醇为原料直接合成十二烷基糖苷 ,研究了工艺条件对反应速率、产物收率与色泽的影响。结果表明 ,催化剂用量对产物色泽无影响 ,适宜的工艺条件为 :正十二醇 /D 葡萄糖 (摩尔比 ) =4∶1,反应温度 110～ 12 0℃ ,反应时间 4h ,反应压力 4kPa ,搅拌速率大于 840r/min ,对甲苯磺酸 /D 葡萄糖 (摩尔比 ) =1.5 %,MgO为较好的中和剂。产物为乳白色 ,十二烷基糖苷总收率大于89%。