一个基于代理签名机制的DRM系统许可授权协议

提出了一个基于代理签名机制的DRM系统，解决了以往DRM系统签名服务器由于用户过多而产生的瓶颈问题，并证明了在增加了代理签名服务器的前提下，其整体安全性不低于单签名服务器的安全性。     

A PLL Clock Frequency Multiplier Using Dynamic Current Matching Adaptive Charge-Pump and VCO Frequency Reuse

A 3.5 times PLL clock frequency multiplier for low voltage different signal （LVDS） driver is presented. A novel adaptive charge pump can automatically switch the loop bandwidth and a voltage-controlled oscillator （VCO） is designed with the aid of frequency ranges reuse technology. The circuit is implemented using 1st Silicon 0.25 μm mixed-signal complementary metal-oxide-semiconductor （CMOS） process. Simulation results show that the PLL clock frequency multiplier has very low phase noise and very short capture time .     

A FRAMEWORK FOR REAL-VALUED CIPHER SYSTEMS

Most cipher systems designed thus far are binary-valued or integer-valued cipher systems. Their security relies on the assumption that one-way functions exist. Though the existence of one-way functions has not been proved yet, most cryptographic researchers believe that one-way functions exist. In addition, many candidates for one-way functions have been proposed. Therefore, the key step for developing real-valued cipher systems is to define real one-way functions and to propose candidates for them. In this paper, based on computational complexity theory over the real field, we give two definitions of real one-way functions; one is for digital one-way functions and the other is for general one-way functions. Candidates for these two classes of one-way functions are also proposed. Moreover, we present two examples to demonstrate that the candidates for both digital one-way functions and general one-way functions can be applied to construct secure real-valued cipher systems.     

并流填料塔滴流区有效界面积

在二氧化碳-氢氧化钠系统中采用液相循环的方法测定了并流向下填料塔的滴流区有效界面积。考察了有效界面积测定的准确性及各种因素的影响,提出填料层高度与有效界面积的经验关联式。在受力分析基础上推得滴流区有效界面积与各参数间的关系,发现滴流区的有效界面积取决于单相持液,据此得到了有效界面积的半理论关联式。     

Enrichment of trace scandium with microcrystalline naphthalene and subsequent ICP-AES determination

A new method is proposed to preconcentrate and separate trace scandium from a large volume of aqueous solution by solid liquid extraction with microcrystalline naphthalene. Scandium oxinate can be adsorbed onto microcrystalline naphthalene quantitatively under certain conditions. The effects of various experimental parameters have been optimized. The influence of additive of cobalt (II) on recovery of scandium (III) is studied in detail. The proposed method has been used for determination of Sc in Certified Reference Material of “Vehicle Exhaust Particulates”.     

CRIS 储层描述综合解释系统软件设计和研制

ＣＲＩＳ储层描述综合解释系统是一个具有多种储层信息提取、储层参数反演和油气综合预测等功能的人机交互储层解释软件系统，该系统目前已开始在大庆油田应用于生产。本文从软件工程角度介绍该系统的主要功能、软件系统设计思想、系统组成和结构特点以及一些开发经验。     

二滩水电站的兴建对陆生脊椎动物的影响及对策

分析了二滩水电站在施工期，竣工蓄水后，水库水位消涨对陆生脊椎动物的影响及应采取的对策。     

酸梅饮料提取工艺研究

对酶梅饮料生产的提取工艺进行研究。发现其浸出过程符合三维平板扩散模型，得出８０℃／６ｈｒ每１０ｍｉｎ搅拌一次的浸取工艺条件。     

软土地基沉降机理与计算方法分析

自１９２３年Ｔｅｒｚａｇｈｉ固结理论问世以来，对软土地基沉降机理和计算方法的分析层出不穷，从简单的半经验公式和图表法到计算机技术推进的数值分析，不一而足．回顾这些方法的发展，评述它们的优缺点、适用条件和指标选取对实际问题的解决有重要意义．每一种计算方法都有其实效性和可操作性，其实施的关键是对软土性状描述的正确性，未来计算方法应向表述简单，使用方便，同时含瞬时、主固结和欠固结三种沉降量计算的方向努力．     

二元树族的Hopf代数结构

在有限二元树的同构类集合生成的向量空间上，利用二元树的节序列定义一个余乘法，得到一个分次，余交换Ｈｏｐｆ代数。