车用柴油机燃油系社会运用工程浅析

柴油机燃油系的工作质量不但对发动机的动力性、经济性和环境污染影响极大＿同时也影响社会经济效益。柴油机燃油系的运用问题实质上是一个社会运用工程。本文对目前存在的问题进行了分析，并提出了自己的见解。     

聚乙烯醇/淀粉复合水凝胶的辐射合成

通过辐射法制备聚乙烯醇/淀粉复合水凝胶,研究了辐照剂量和淀粉含量对聚乙烯醇/淀粉复合水凝胶的凝胶含量和溶胀率的影响.辐照剂量较小时,凝胶含量随着淀粉含量的增加明显降低,当辐照剂量大于40kGy时,凝胶含量随淀粉含量的增加下降平缓,溶胀率则随淀粉含量增加逐渐增大.红外结果分析表明淀粉与聚乙烯醇发生接枝反应.结果表明,通过...     

羧甲基瓜尔胶压裂液的研究与应用

针对低渗透储层压裂增产改造的需要,开发应用了一种新型羧甲基瓜尔胶压裂液.利用红外光谱、滴定和黏度等实验法表征了羧甲基瓜尔胶的结构、羧甲基的取代度和相对分子质量,研究了羧甲基瓜尔胶的水溶性以及羧甲基瓜尔胶压裂液的件能,并和羟丙基瓜尔胶压裂液进行了对比分析.实验结果表明:羧甲基基团的引入导致瓜尔胶高分子链构象更加伸展,因此...     

北京CBD核心区总体设计与公共开发

从2001年开始,北京CBD经过10年的高速建设,除核心区外的80%项目陆续从规划蓝图变成现实,CCTV、BTV、国贸3期、银泰中心等超级大厦已经在人们心目当中留下了深刻的印象,有的项目已经成为有国际影响力的时代标志。随着人们对北京CBD的认识更加清晰,对CBD核心区也有了更高的期待。如何建设更具整体性的综合体,能够融入已建成的城市环境,再次提升北京CBD的形象与品质,这些问     

Stack evaluation of arbitrary set-associative multiprocessor caches

We propose a simple solution to the problem of efficient stack evaluation of LRU multiprocessor cache memories with arbitrary set-associative mapping. It is an extension of the existing stack evaluation techniques for all set-associative LRU uniprocessor caches. Special marker entries are used in the stack to represent data blocks (or lines) deleted by an invalidation-based cache coherence protocol. A method of marker-splitting is employed when a data block below a marker in the stack is accessed. Using this technique, one-pass trace evaluation of memory access trace yields hit ratios for all cache sizes and set-associative mappings of multiprocessor caches in a single pass over a memory reference trace. Simulation experiments on some multiprocessor trace data show an order-of-magnitude speed-up in simulation time using this one-pass technique     

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研制了一套易于开启的天然气水合物实验装置，使合成的水合物很容易取出以便直接测定其储气量。设计加工了一套利用天然气水合物在真空下分解测量其气体体积的实验装置，提出了一种直接测定甲烷水合物储气量的方法—容积法，并测定了在不同条件下生成的甲烷水合物的储气量。与传统的重量法相比，容积法的可操作性强，受环境因素和人为因素的影响小，精密度与准确度高，能够比较准确地直接测出甲烷水合物的储气量，在天然气水合物资源量评价及天然气运输技术方面，都有广阔的应用前景。     

压裂酸化施工工艺优化设计

该介绍了压裂酸化施工优化设计技术，实践说明，可以提高施工成功率和有效率，有好的经济效益。     

Design of MAC protocols with fast collision resolution for wireless local area networks

Development of efficient medium access control (MAC) protocols providing both high throughput performance for data traffic and good quality of service (QoS) support for real-time traffic is the current major focus in distributed contention-based MAC protocol research. In this paper, we propose an efficient contention resolution algorithm for wireless local area networks, namely, the fast collision resolution (FCR) algorithm. The MAC protocol with this new algorithm attempts to provide significantly higher throughput performance for data services than the IEEE 802.11 MAC algorithm and more advanced dynamic tuning backoff (DTB) algorithm. We demonstrate that this algorithm indeed resolves collisions faster and reduces the idle slots more effectively. To provide good fairness performance and to support good QoS for real-time traffic, we incorporate the self-clocked fair queueing algorithm and a priority scheme into the FCR algorithm and come up with the real-time FCR (RT-FCR) algorithm, and show that RT-FCR can simultaneously achieve high throughput and good fairness performance for nonreal-time traffic while maintaining satisfactory QoS support for real-time traffic.     

染料掺杂的聚合物波导膜的制备及电光性质的研究

用溶液沉积的方法制备了染料分散红掺杂的聚苯乙烯膜,并用电场取向的方法对膜中的染料极性分子进行了取向。对取向膜进行的电光测试结果表明取向膜的电光系数r_(33)≈35pm/V较无机晶体要大。     

工业燃煤锅炉微机控制系统设计

本文介绍了一种以ＳＴＤ工控机实现的工业锅炉给水与燃烧控制系统，该系统帝现了工业锅炉高效率、低污染的智能优化控制，达到了安全、节能、保护环境的目的。