IFP连续重整新一代催化剂再生技术的改进

介绍了我国引进的采用法国石油研究院 (IFP)三代催化剂连续再生技术的重整装置 ,分析了第二、第三代技术在原有基础上的改进 ,从再生气循环回路、再生操作参数和再生器内部结构三个方面重点介绍了第三代催化剂连续再生技术的特点和优势 :使催化剂的烧焦气循环回路与氧氯化用气、焙烧气循环回路彼此分开 ,烧焦、氧氯化、焙烧的操作参数可分别得到优化 ,使氧氯化及焙烧在高氧条件下进行 ,有利于催化剂金属的再分散 ,保持催化剂的活性。     

公钥密码理论与技术的研究现状及发展趋势

密码技术是信息安全技术的核心。该文概括介绍了国内外公钥密码的研究现状，特别是近年来国际上相继进行的一系列大型的密码标准化工作，阐述了公钥密码的主要理论基础，介绍了椭圆曲线公钥密码体制及其特点。指出了公钥密码的发展趋势及我国在制定密码的标准化问题上的研究重点。     

PRECIPITATION OF TiC IN METASTABLE β-Ti ALLOY

In order to clarify that the IFP and the “Type 2”α phase are also arising from TiC,ametastable β-Ti alloy was selected for investigation in this work.The results showed that af-ter heating the alloy just below the α+β→β transus temperature and quenching,the TiC lay-er existed at the α/β interface.The morphology of TiC is similar to that of the IFP arisingfrom TiH_2 in the α-β two-phase alloys.The IFP TiC also provided an easy crack path orthe crack initiation sites.The fracture is also identical to that caused by IFP TiH_2.The arceddiffractions(characteristic of “Type 2”α)were found in the selected area diffraction pat-terns of some specimens which had been isothermally aged after solid solution treatment.Theparticles which bring on the arced diffractions may be TiC on the basis of structure and lat-tice parameter analysis,not the so called “Type 2”α phase.     

Rerefining of used oils — a review of commercial processes

The total demand for lubricants in India is in the region of 855,000 tonnes a year. This constitutes 1.5% of total petroleum products consumption. Presently, there are three lubricant refineries in the country with a total installed capacity of 535,000 tonnes. The shortfall, of about 370,000 tonnes (approximately 45% of demand), is met through imports. In addition, there are generated 60,000–65,000 tonnes a year of base oil through rerefining of used oils. The three refineries are being expanded in order to raise base oil production to 810,000 tonnes per annum. Some other refinery projects are also under consideration and approval by the government. The current expansion programmes, together with the projected new refineries, are expected to make India self-sufficient in terms of base stock production lubricant. Overall, lubricant production in India is entirely dependent on imported lubricant-bearing crudes, and not on the indigenous crudes, which are non-lube bearing. With recent advances in engine design, together with improved lubricant quality through high-performance lubricants, the consumption, or demand rate, has been in decline or unchanging in most countries. In India, a gap still exists between production and demand of lubricants, necessitating import. Since they are a high-value, non-energy product, lubricant conservation measures are therefore essential. Interest in rerefining of used oil is increasing, with more and more emphasis on making the processes environmentally friendly. The conventional acid-clay rerefining process is environmentally unfriendly, and hence needs modification. An attempt is made in this paper to highlight various rerefining processes available. The relative merits and demerits of each process are discussed, and among the various processes, that based on molecular/high vacuum distillation is covered in detail.     

满足更苛刻汽油规格的炼油技术

分析了炼油厂为满足汽油新规格要求所面临的挑战 ,可采取的对策及法国石油研究院可提供的炼油技术。简要介绍了这些技术的特点、各种方案对比和可以达到的效果。     

IFP连续重整技术的最新进展

论述了ＩＦＰ对连续重整技术发展方向的认识以及ＩＦＰ连续重整技术的最新进展，并对各项技术改进的结果进行了充分对比。     

一体化瞬时浮点ADC信号调理电路的设计研究

提出一种瞬时浮点ADC电路,论述循环放大与自动校零算法、浮点ADC的原理。电路可实现失调误差自动补偿、快速增益自适应控制以及浮点模数转换等,其全局和瞬时动态范围分别达到150db、90db,采样速率达80～130kSPS,有效精度达25bit。     

光纤法布里—珀罗传感器

阐述了目前作为光纤传感器研究领域中热点之一的光纤法布里－珀罗干涉传感器的起源与发展、结构特点及应用前景。     

Improvement on Meshram et al.ʼs ID-based cryptographic mechanism

Meshram et al. proposed an ID-based cryptosystem based on the generalized discrete logarithm problem (GDLP) and the integer factorization problem (IFP) in 2012, and their contribution lies in that they firstly proposed an idea to construct the ID-based cryptosystem without using the bilinear pair. This scheme can achieve the security goal of protecting data and prevent the adversary from snooping the encrypted data or the user?s private key. However, our analyses show that their scheme is still incorrect and has a deadlock problem, because the user cannot carry out the encryption process as expected because it is required for the user to own the key authentication center?s private information which is designed to be secret to users. A solution to the deadlock problem is given and an improved scheme is proposed.     

基于可拓理论的数据挖掘在水轮机方案设计中的应用

针对大型水轮机方案设计复杂性的特点,建立了面向知识重用的有约束的基元可拓集,并基于基元的可拓性和可拓变换.探讨了基于可拓集合方法的数据挖掘技术实现;提出了一种改进的FP-growth关联规则算法对有约束的基元可拓集进行关联规则挖掘,并利用基元的相关性和蕴含性对已获得的关联规则进行拓展,获得更多有价值的知识.最后.通过大型水轮机选型方案设计实例进行了说明.