光纤环形延迟线陷波器最佳陷波的实现及PIIN的影响

本文研究了ＰＩＩＮ的时，频响应特性，得到了它作为陷波器的最佳陷波条件，提出了利用环路损耗调节器性能，实现最佳陷波特性的方法，采用该方法使ＦＯＲＤＬ的陷波深度达到了６５ｄＢ，同时，本文还研究限制ＦＯＲＤＬ最佳陷波特性实现的主要系统因素－相位感生的强度噪声（ＰＩＩＮ）给出其在单模条件下的频率特性，由此出发，分析了影响ＰＩＩＮ的几个因素，提出了抑制ＰＩＩＮ的三个途径：（１）采用极化控制器适当调节两个正交     

10Gbit/s 1070km普通单模光纤环路传输实验

本文详细介绍了光纤环路实验的基本原理和实现方法,报道了国内首次利用环路实现的１０Ｇｂｉｔ／ｓ超过１０００ｋｍ普通单模光纤（ＳＭＦ）传输实验的结果并进行了分析讨论,提出了今后进一步开展高速超长距离光纤传输实验研究应考虑的因素。     

离子棒在农药厂循环冷却水系统中的应用

通过离子棒在循环冷却水系统中的应用实例,介绍了安装使用过程,研究了其对循环水的处理机理,并将离子棒技术与加药技术在处理效果上做了对比和分析.     

石化企业循环冷却水系统节能优化

对目前石化企业循环冷却水系统存在的问题,提出强化传热和循环冷却水的串级利用的方法,加强生产和水质管理,以降低循环冷却水系统能耗。     

层次分析法(AHP)在军团菌杀灭方法评判中的应用

该文利用层次分析法(AHP)对军团菌杀灭方法进行综合评判。以中央空调循环冷却水系统为例,建立评价指标系统,对军团菌控制效果以及化学杀生剂进行综合评价,由此得到化学法是最适于中央空调循环冷却水系统的杀菌方法。其中军团菌特效杀菌剂的杀菌性能最佳,可作为应急处理药剂,二氧化氯、2,5-二溴海因、二氯异氰尿酸可作为日常处理药剂。在条件允许的情况下,可使用臭氧作为处理药剂。     

Nitrification in a packed bed bioreactor integrated into a marine recirculating maturation system under different substrate concentrations and flow rates

BACKGROUND: A packed bed bioreactor (PBBR) activated with an indigenous nitrifying bacterial consortia was developed and commercialized for rapid establishment of nitrification in brackish water and marine hatchery systems in the tropics. The present study evaluated nitrification in PBBR integrated into a Penaeus monodon recirculating maturation system under different substrate concentrations and flow rates. RESULTS: Instant nitrification was observed after integration of PBBR into the maturation system. TAN and NO₂‐N concentrations were always maintained below 0.5 mg L^?1 during operation. The TAN and NO₂‐N removal was significant (P < 0.001) in all the six reactor compartments of the PBBR having the substrates at initial concentrations of 2, 5 and 10 mg L^?1. The average volumetric TAN removal rates increased with flow rates from 43.51 (250 L h^?1) to 130.44 (2500 L h^?1) gTAN m^?3 day^?1 (P < 0.05). FISH analysis of the biofilms after 70 days of operation gave positive results with probes NSO 190 ((β ammonia oxidizers), NsV 443 (Nitrosospira spp.) NEU (halophilic Nitrosomonas), Ntspa 712 (Phylum Nitrospira) indicating stability of the consortia. CONCLUSION: The PBBR integrated into the P. monodon maturation system exhibited significant nitrification upon operation for 70 days as well as at different substrate concentrations and flow rates. This system can easily be integrated into marine and brackish water aquaculture systems, to establish instantaneous nitrification. Copyright © 2011 Society of Chemical Industry     

飞机厕所清洗剂的开发研究

该清洗剂是一种触变型酸性液体清洗剂,用于去除飞机上的真空循环厕所系统中的硬水垢和尿垢以及其它污垢,不腐蚀管道,对金属管道有保护作用。并且该产品具有一定的黏度,挂壁性比较好,对真空和循环厕所系统的斜面或垂直面上的污垢去除效果较佳。     

Integrated Membrane Bioreactor for Water Quality Control in Marine Recirculating Aquaculture Systems

The aquaculture live feed organisms Acartia tonsa (a calanoid copepod, experiment 1) and Brachionus “Cayman” (a rotifer, experiment 2) were cultivated in marine recirculating aquaculture systems (RAS), respectively. The pilot plant was built as a combination of conventional RAS (cRAS) and as a modified RAS which implemented an ultrafiltration membrane bioreactor (MBR) for the removal of fine suspended solids and colloidal particles as part of the treatment system (mRAS). The two treatment schemes were connected to the same biofilter (a moving bed bioreactor). In the first experiment, the membrane was operated with no extraction of concentrate, and hydraulic retention time (HRT) of 6 hours (i.e., water exchange in the cultivation tanks of 4 times per day). In the second experiment, the membrane was operated with daily extraction of concentrate, and HRT of 12 hours. Results show that the MBR option is more efficient in removing particles from the recycle stream than conventional RAS. However, the impact this has on the number of particles in the live feed cultivation tanks is not readily apparent based on particle analysis. The amount of suspended solids added during feeding exceeds the amount removed in the recycle system. This requires a higher recirculation rate and different membrane operating conditions.     

海水循环冷却系统铜合金缓蚀剂研究

应用腐蚀失重、弱极化和动态极化曲线等方法,重点研究了黄铜H68A在不同浓缩倍数海水中的腐蚀行为及其缓蚀剂。腐蚀研究结果表明,黄铜H68A的腐蚀速率随时间的延长逐渐降低,温度升高腐蚀速率在50℃达到最大,随浓缩倍数的增大腐蚀速率降低,原海水中腐蚀最重;缓蚀剂研究表明,有机缓蚀剂和无机缓蚀剂复合使用,协同效应明显。采用高复合预膜缓蚀剂含量处理,再在相对低复合缓蚀剂含量正常运行,浓缩倍数N≤2.0时,黄铜H68A、HSn70和HSn62的腐蚀率≤0.01 mm/a,腐蚀得到有效控制。     

Short fibers suspension in steady recirculating flows

Numerical modeling of short fiber suspensions flows involves the coupling between motion equations, which definean elliptic problem, and the fluid constitutive equation, which introduces a non‐linear advection problem related to the fiber orientation (induced anisotropy). In a previous work these authors have proposed a numerical procedure to determine a steady solution of the fibers orientation in steady recirculating flows, taking into account that neither initial nor boundary conditions are given. This procedure may be used in the numerical simulation of SFRT flows involving recirculating parts as encountered in the simulationof industrial processes, as well as in inverse rheological identification using, for example, rotative rheometric devices.