超低密度硬胶极压型油包水乳化钻井液在广安002-H9井的应用

在超低密度钻井液的使用方面，传统的油基钻井液和油包水钻井液存在易着火、安全性差的问题，而最近使用的美国3M公司的中空玻璃微珠聚磺钻井液又存在固控困难、钻井液费用很高等难题。为此，从选择合适的润湿反转剂和阻燃剂入手，在室内对获得的超低密度硬胶极压型油包水乳化钻井液成果配方进行了全面评价，并应用在广安002 H9井水平段欠平衡钻井中取得了良好效果。室内研究与现场应用表明，超低密度硬胶极压型油包水乳化钻井液能够很好地满足广安构造水平井段欠平衡钻井的需要。该钻井液体系具有防塌、润滑、携砂能力强，密度容易控制，钻井液单位成本合理并可重复使用，安全性好等显著特点，适合在类似广安构造的水平井段中推广应用。     

Robust Distributed Source Coding

We consider a distributed source coding system in which several observations must be encoded separately and communicated to the decoder by using limited transmission rate. We introduce a robust distributed coding scheme which flexibly trades off between system robustness and compression efficiency. The optimality of this coding scheme is proved for various special cases.     

乙烯装置中汽油分馏塔设计浅析

对汽油分馏塔的技术特点进行了分析,对急冷油系统的设计和汽油分馏塔的内件选择和设计进行了分析和讨论.     

Morphology and properties of poly[2‐methoxy‐5‐(2′‐ethyl‐hexyloxy)‐para‐phenylene vinylene]/silica nanoparticle hybrid films

Poly[2‐methoxy‐5‐(2′‐ethyl‐hexyloxy)‐para‐phenylene vinylene] (MEH‐PPV)/silica nanoparticle hybrid films were prepared and characterised. Three kinds of materials were compared: parent MEH‐PPV, MEH‐PPV/silica (hybrid A films), and MEH‐PPV/coupling agent MSMA/silica (hybrid B films), in which MSMA is 3‐(trimethoxysilyl) propyl methacrylate. It was found that the hybrid B films could significantly prevent macrophase separation, as evidenced by scanning electron and fluorescence microscopy. Furthermore, the thermal characteristics of the hybrid films were largely improved in comparison with the parent MEH‐PPV. The UV‐visible absorption spectra suggested that the incorporation of MSMA‐modified silica into MEH‐PPV could confine the polymer chain between nanoparticles and thus increase the conjugation length. The photoluminescence (PL) studies also indicated enhancement of the PL intensity and quantum efficiency by incorporating just 2 wt% of MSMA‐modified silica into MEH‐PPV. However, hybrid A films did not show such enhancement of optoelectronic properties as the hybrid B films. The present study suggests the importance of the interface between the luminescent organic polymers and the inorganic silica on morphology and optoelectronic properties. Copyright © 2004 Society of Chemical Industry     

Printed Electrochemical Devices Using Conducting Polymers as Active Materials on Flexible Substrates

This paper reports some of our initial works in pursuit of a simple and low-cost method of fabricating all-organic electrochemical diodes, triodes, and transistors on flexible plastic or paper substrates. Conducting polymer poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT : PSS), utilized as an active component, is deposited by spin-coating or printing techniques. The devices are directly fabricated from design without the need for masks, patterns, or dies. The output characteristics of both half-wave and full-wave rectifier circuits from two-terminal diodes show stable performances at frequencies below 5 Hz. In three-terminal tunable triodes, threshold voltage can be tuned in the range between 0.25 and 1.6 V. In four-terminal transistors, ambipolar operation function can be realized in one single device. I/sub ON//I/sub OFF/ current ratios of 10/sup 3/-10/sup 4/ have been achieved in the triode and transistor at operating voltages below 3 V. In addition, the device applications in electrochromic displays, logical circuits, as well as the switching speed of the circuits and device stability, are discussed.     

即时通讯软件的安全性分析

在互联网服务中,即时通讯已成为了最流行的服务模式之一,人们对即时通讯的依赖程度也与日俱增。但是, 频频出现的病毒和黑客攻击使广大用户深受其害,即时通讯的安全问题也日益严峻。为了从根本上解决问题,本文对即时通讯软件的架构和协议进行了深入分析,目的是找出漏洞根源,给开发者和使用者提供防止漏洞的依据。     

污水处理厂恶臭含硫化合物的研究

分析了污水处理厂各个不同工艺段气、液两相中恶臭有机含硫化合物的分布情况,同时运用气相色谱-质谱联用仪及吹扫-捕集系统对甲硫醇、甲硫醚、羰基硫、二硫化碳和二甲二硫等五种化合物进行了定性准确的和定量分析,并对其产生机制及来源进行了较为详实的解析.其中挥发性气体样品的采集通过动态箱收集,溶解在水体中的目标化合物运用高纯氮气吹脱收集.研究结果表明,在水相和气相中的恶臭化合物的分布在不同的处理单元呈现不同的恶臭浓度,但经过污水处理厂各工艺的深度处理后, 溶解在水体当中的恶臭含硫化合物及挥发到大气中的化合物均有明显下降,去除率均达到90%以上.     

Effect of refraction on optical microscopic measurement of internal blood-vessel diameter and its correction

In optical microscopic measurement of internal blood-vessel diameters, the effect of refraction must be taken into account to ensure accuracy of the result. This effect is discussed and an analytical correction formula derived. Phantom blood vessels with known internal and external diameters were used to test the validity of the correction formula. The errors obtained prior to correction were reduced significantly after correction.     

大朝山水电站地下洞室安全监测资料分析

大朝山水电站引水发电系统为地下工程，根据各项安全监测物理量的主要观测成果，对最大观测值分析其对工程的安全影响，为保证其安全运行具有重要意义。为此，分别对大朝山水电站的主要地下建筑物，包括压力引水隧洞、地下厂房、尾水调压室的最大观测值进行了分析研究，并提出了一些建议，有较大的参考价值。