从马克思到邓小平的社会主义商品经济发展模式探析

社会主义国家能否发展商品经济,在马克思主义经济学说史上有过一个从否定到部分肯定再到肯定的认识发展过程。马克思、恩格斯预测社会主义是没有商品生产的社会。列宁认为从资本主义到社会主义过渡的时期仍然需要保留商品生产。斯大林部分肯定了社会主义商品生产的可能性,但又把它局限在个人消费品的范围。毛泽东在不同时期对社会主义发展商品经济的问题有着相互矛盾的态度。邓小平科学地解决了社会主义同商品经济的关系问题,创造性地提出了社会主义市场经济理论,这是对在社会主义条件下发展商品经济的创新性认识。     

工程装备的腐蚀与防护对策

叙述了工程装备在不同工作环境中的腐蚀失效形式，详细分析了其大气腐蚀、水介质腐蚀、土壤腐蚀等腐蚀形式产生的原因、腐蚀机理及行为，并从工程装备的选材和结构设计、电化学保护、施加高效防腐涂层等方面入手，制定了相应的防腐技术对策，从而达到提高工程装备使用寿命和可靠性的目的。     

A Study on the Surface Structures of Viscose-based Activated Carbon Fiber by FT-IR Spectroscopy and XPS

Using viscose fiber (VF) as starting material and common steam as activating agent, formation of oxygen structures in activated carbon fiber is investigated. In the preparation of samples, VF was first heated at temperatures between 450℃ and 900℃ in N_2 artmosphere. Then, in a successive activation stage, the product carbonized at 600℃ was activated in steam at 450-900℃ for 30 min, and at 600℃ for 5-30 min. The other carbonization products were activated at 600 and 900℃ for 30 min respectively. The products activated at 900℃ were then activated at 450℃ for 30 min again. The starting materiah carbonized products and all activation products were examined by FT-IR spectroscopy and some products were examined by X-ray photoelectron spectroscope (XPS). And the yields of the carbonized and activated products were calculated. By analysing these spectra, the amount of oxygen-containing functional groups of the activated products attained under various activation time, various activation temperature and     

Switched Capacitor Network Analysis by Means of TCM

The totally coded method (TCM) reveals the same objective law, which governs the gain calculating for signal flow graph as Mason formula does. This algorithm is carried out merely in the domain of code operation. Based on pure code algorithm, it is more efficient because figure searching is no longer necessary. The code-series (CS), which are organized from node association table, have the holoinformation nature, so that both the content and the sign of each gain-term can be determined via the coded method. The principle of this method is obvious and it is suited for computer programming. The capability of the computeraided analysis for Switched Capacitor (SCN) can be enhanced.     

Meshing Theoretical Study and Simulation on Cylindrical Tri-sine Oscillating Tooth Gear Drive

The structure of cylindrical tri-sine oscillating tooth gear drive is presented. Based on the space meshing theory, equations of meshing and tooth profile are established and its meshing theory is studied. Using Pro/E, this system is modeled and simulated,which is compared with the above-established equations.     

Kinetics of Chlorine Decay in Water Distribution Systems

A combined first and second-order model, which includes bulk decay and wall decay, was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC), the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.     

Finite Element Analysis and OADs Optimization of the Temperature in the Plane-strain Orthogonal Metal Cutting Process

IntroductionDuringthemetalremoving process,a greatdealofheatwillbe generatedbythemechanicalworkbeingconvertedintoheatthroughthe plasticdeformationinvolvedduringchipformationandalsoduetofrictionalworkbetweenthetool,chipandworkpiece[1] .Thisheatmaybeveryharmfultothemachine ,toolandtheworkpiecesbeingmachined ,socontrollingthequantityofcuttingheatisaveryimportant probleminmachiningprocess.Overthese years ,manyimprovementsinmanufacturingtechnologiesrequiredinthemodelingandsimulationofmetalcutting p…     

信息大系统综合集成研究的体系模型

信息系统学科的发展对信息系统集成已从组织层面上提出了要求，从技术层面上提供了条件．集成化的信息大系统应是物理系统与认知系统的统一，具有走向智能化的趋势．信息系统的集成与发展可分为4个层次，现提出一个第3层面上的信息系统综合集成的体系模型，用以支持信息系统综合集成的研究．     

小卫星分布式雷达

小卫星分布式雷达是一种新概念雷达系统 ,具有重要的应用前景。本文讨论了小卫星分布式雷达的基本概念 ,探讨了其在未来航天装备中的作用和地位 ,阐明了小卫星分布式雷达技术的科技内涵 ,最后提出了对我国发展天基雷达的几点思考     

大气颗粒物的分形特征

介绍了大气颗粒物的分形特征，及其研究意义。回顾了国内外用实验方法测定大气颗粒物分维和用计算机模拟凝聚计算分维的发展情况，展望了大气颗粒物分形性质的研究方向。