Sensitivity of MOS sensors towards chlorine

The high sensitivity of metal-dielectric-semiconductor (MOS) sensors of the type Pd-Ta₂O₅-SiO₂-Si towards chlorine is observed, and this makes it possible to measure its concentration at the level of 0.1 ppb. The sign of the MOS response to chlorine is opposite to that for hydrogen and hydrogen-containing gases. By means of pulsed heating there is a reduction by an order of magnitude in sensor response and recovery time. __________ Translated from Izmeritel’naya Tekhnika, No. 8, pp. 65–67, August 2006.     

发酵香肠葡萄球菌的生理生化特性的测定

试验采用中国传统发酵香肠作为采集样品,从中分离纯化出具有革兰氏阳性和触酶阳性的葡萄球菌,对此菌株做生理生化特性鉴定,以对发酵香肠的菌株进行进一步的筛选,从中选出不产粘液、发酵葡萄糖不产气、不产色素、不产H2S、不具有氨基酸脱羧酶、不产氨、15℃能还原硝酸盐、pH4.5条件下生长的菌株作为发酵香肠中的优良葡萄菌株,最后测定优势菌株24小时的生长曲线和pH变化曲线。     

Automatic sampling equipment and bod test nitrification

The influence of automatic sampling equipment on BOD test nitrification in non-nitrified final effluent was evaluated. Samples were tested for BOD, carbonaceous BOD, nitrogenous oxygen demand and concentration of nitrifying bacteria. Biofilms inside the equipment were tested for nitrification potential. A sampler utilizing continuous circulation of final effluent was found to support attached growth of nitrifying bacteria and was associated with relatively high effluent nitrogenous oxygen demand. The effluent nitrogenous oxygen demand and nitrification potential of attached growth were significantly less with a unit that aspirated effluent on an intermittent basis, purging the sample line with air before and after sampling. Peak nitrifier counts in samples from the continuous flow equipment exceeded those in samples from the intermittent flow equipment.     

组合生化法处理难降解聚醚废水的工程实践

基于聚醚多元醇生产废水的水质特性和生化特性,通过处理试验,在工程中采用分类处理,预先膜分离回收废水中难降解的高分子聚醚多元醇,然后通过厌氧/好氧组合生物处理工艺处理.运行结果表明,废水排放指标达到GB 8978-1996一级标准与江苏省地方标准COD_(Cr)≤80 mg/L,效果良好.     

A spectrum analyzer with a tracking heterodyne

A generalized block diagram is presented and the requirements imposed on the main units of the tracking heterodyne of a sequential-action spectrum analyzer are determined. A method of generating the tracking-heterodyne signal is considered, which enables the error to be reduced considerably and enables the dynamic range of the measurement of the characteristics of linear radio devices to be extended. Translated from Izmeritel’naya Tekhnika, No. 3, pp. 65–67, March, 2009.     

生化需氧量测定中获得接种液的一种方法

指出接种稀释水质量是直接决定生化需氧量测定准确与否的关键因素,提出了直接用工业废水驯化微生物以培养适合测定生化需氧量接种液的方法,并通过实践分析了培养方法的可行性和测定结果的准确性。     

Integrative biological systems modeling: challenges and opportunities

Most biological systems are by nature hybrids consist of interacting discrete and continuous components, which may even operate on different time scales. Therefore, it is desirable to establish modeling frameworks that are capable of combining deterministic and stochastic, discrete and continuous, as well as multi-timescale features. In the context of molecular systems biology, an example for the need of such a combination is the investigation of integrated biological pathways that contain gene regulatory, metabolic and signaling components, which may operate on different time scales and involve on-off switches as well as stochastic effects. The implementation of integrated hybrid systems is not trivial because most software is limited to one or the other of the dichotomies above. In this study, we first review the motivation for hybrid modeling. Secondly, by using the example of a toggle switch model, we illustrate a recently developed modeling framework that is based on the combination of biochemical systems theory (BST) and hybrid functional Petri nets (HFPN). Finally, we discuss remaining challenges and future opportunities.     

好氧生化法处理印染废水工程调试

印染废水由于使用的染料,助剂等化工原料的种类非常多,水质差别也很大,根据保定-印染厂废水处理工程的实际情况,对废水水质、工程调试等内容进行了归纳总结,为类似工程调试提供帮助.项目废水水质:COD为400～1000mg·L~(-1),均值549mg·L~(-1),色度为400倍.通过采用好氧生化工艺处理后,COD和色度的去除率分别为95%、90%,水质符合排放标准要求,达标排放.     

Bunker‐stored silage covered with biodegradable coating. Part I. Laboratory assay

The effect of a hydrophobic biodegradable coating on the conservation of silage was evaluated in comparison with unsealed silage and silage covered with a polyethylene (plastic). Silage samples were subjected to biochemical analysis (pH, dry matter, water‐soluble sugars, ammoniacal nitrogen, lactic acid) and microbiological analysis (total aerobes, lactic acid bacteria, moulds and yeasts) during 135 days of storage. Silage covered with the biodegradable coating had a constant pH value of 4.79 and was preserved against spoilage until day 120, whereas the pH of unsealed silage increased during the first 6 days to a value of 8.22. After 2 months of storage, silage covered with the biodegradable coating had a lower dry matter content, higher water‐soluble sugar content and higher lactic acid concentration than unsealed silage. During storage the population of total aerobes was lower in silage covered with the biodegradable coating than in silage covered with plastic. Furthermore, silage covered with the biodegradable coating had a stable content of aerobic micro‐organisms. The biodegradable‐coated silage showed a growth of lactic acid bacteria similar to that of silage covered with plastic. Only silage covered with the biodegradable coating had a low initial content of moulds and yeasts. Air infiltration was present throughout the storage period in the plastic and biodegradable coating treatments and was linked with the degradation of silage in both cases. However, the biodegradable coating significantly (P ≤ 0.05) increased the period of silage conservation compared with that of uncoated silage. Copyright © 2004 Society of Chemical Industry     

WT-300型氧量分析仪的设计

WT-300型氧量分析仪是在研究氧化锆氧量分析仪多年的基础上研制成功的自动分析仪表。它适应于分析各种工业锅炉、窑炉及加热炉中的氧含量。详细介绍了WT-300型氧量分析仪的工作原理,仪表结构及标定方法等内容,为工业现场监控氧含量提供了简便地检测手段和准确地测量方法。