Influence of China‘s WTO Entry on Petroleum Taxation

China has formulated a series of preferential taxation policies for the country 's petroleum enterprises. Those state policies are the important factors influencing reform and development of petroleum enterprises. The taxes turned over to the State by CNPC in 1998, 1999 and 2000 are 31.4 billion yuan, 31.7 billion yuan and 41 billion yuan respectively, accounting for 11.64 percent, 9.06 percent and 10.15 percent of the annual sales income.With China 's entry into WTO, it is necessary for t…     

γ 射线引发 VAc 乳液聚合以制备白乳胶的动力学及工艺条件研究

研究了ＶＡｃ的辐射乳液聚合动力学，并对其聚合工艺条件作了初步探索。得出ＶＡｃ乳液在进行辐射聚合时，成核期结束较早（转化率在１０％以下），有相当长的恒速期存在。乳胶粒子直径在０．５～３μｍ之间，比一般的乳液聚合乳胶粒子要大。同时从动力学数据还可以看出几种成核机理（胶束成核，水相成核和液滴成核）同时存在，由此对试验条件提出了相应的要求。     

Anaerobic digestion of alkaline black liquor using an up-flow anaerobic sludge blanket reactor

The anaerobic digestion of alkaline black liquor from a cereal straw pulping mill was studied in batch (serum bottles) and continuous systems (up-flow anaerobic sludge blanket reactor—UASB). The batch digestion studies confirmed that lignin and related compounds (LRC) in the alkaline black liquor were the main inhibitory substances and could not be decomposed by anaerobic bacteria. At organic loading rates of 5–10 kg COD m^?3 day^?1, the UASB reactor achieved 50–60% COD removal efficiencies. Gas production was 2–3 dm³ per dm³ of alkaline black liquor. Two different sludge types were examined in the reactor: granular and cluster-like sludges. Sludge in a cluster, which involved many small granules and flocs, tended to form larger aggregates and possessed good settling ability.     

金湖县防汛信息化的现状分析与对策研究

水利信息化作为水利现代化的基础和标志,是防洪减灾、水资源管理、水环境监测和水土保持的重要手段和技术支撑,是提高水利管理工作效率和效能、实现水利服务社会的重要途径和必然要求,是改造传统水利、促进水利改革与发展的重要措施和迫切需要.阐述了目前水利工程现状和非工程措施建设现状,存在的问题及需求分析,并提出相关解决对策.     

Incorporating Actor-Critic in Monte Carlo tree search for symbolic regression

Neural Computing and Applications - Most traditional genetic programming methods that handle symbolic regression are random algorithms without memory and direction. They repeatedly search for the...     

Adsorption characteristics of hexadecyl ammonium with different numbers of carbon chains in montmorillonite and the structure of the prepared composites

Journal of Porous Materials - The dynamics and thermodynamics of adsorption of hexadecyl ammonium with different numbers of carbon chains in montmorillonite (Mt) with different layer charge density...     

20 kg铝锭铸造机铸模改进方案探讨

为了适应火车全面调速后货运高度的要求，提出了有效的铸模改进方案。对铸模改造前后的使用寿命进行了分析。通过改造达到了降低铝锭垛高的目的，同时延长了铸模的使用寿命。     

某型伸缩机翼无人机的性能分析

由于众多机翼变形方式中,伸缩机翼能提供一种较为简单的一维变形方式,使得在机翼的气动特性发生较大变化时,无人机能获得不同飞行状态下较优的飞行性能.为评估机翼伸缩带来的性能收益,使用雅典娜涡格法程序(AVL)作为气动分析工具,对安装有伸缩翼的某型无人机进行气动分析与性能计算,并研究伸缩机翼变形机构带来的额外增重对性能的影响.分析结果表明:在相同攻角范围下,伸缩机翼的最大升阻比提高36.57％,最大升力系数提高34.85％;伸缩翼无人机的阻力、航时与航程、起飞与着陆距离等性能收益,受变形机构带来的机翼额外增重影响,并且增重量越大,伸缩翼无人机的性能收益越少.     

17-4PH沉淀硬化不锈钢氮离子注入及其复合改性的研究

采用N+注入，N-C-O共渗结合N+注入的表面复合改性方法，探索强化17－4PH钢表面的有效途径，该方法赋予基体表面一定深度的改性范围与低摩擦系数，因而强化效果达到最佳。同时还探索了不同时效温度下，基体心部硬度变化的规律。     

160 t钢包翻包机结构与功能

新型钢包翻包机是九十年代从国外引进的一种专用设备,其以高效、安全、便捷等特点越来越多的应用于大型钢铁厂.本文介绍了160 t翻包机结构与功能.