石脑油价格波动分析与预测方法研究

分析了石脑油价格波动影响因素和市场采购特性,在利用主成分分析法分析石脑油价格波动影响因素的基础上,分别采用回归分析、时间序列、神经网络和支持向量机的方法进行预测模型构建,并在深入组合分析的基础上,进行优性组合,建立了石脑油价格组合预测模型。     

等径角挤压中内角半径作用的有限元模拟

内角半径是等径角挤压过程中影响试样变形均匀性的重要因素。运用有限元模拟的方法研究了内角半径在等径角挤压过程中的作用。结果表明,内角半径小易产生空隙;随内角半径的增大,材料流动阻力增大,试样底部速率降低,引起试样严重的不均匀变形与等效应变的不均匀分布。     

白土精制过程中脱氧与润滑油基础油比色关系的研究

分析了酸性白土在润滑油白土精制过程中对油品的氧化机理。根据小型试验和工业生产数据,提出了真空脱氧是消除精制过程中油品氧化增色的有效途径。     

外加颗粒增强金属基复合材料的现状及展望

综述了获得外加颗粒增强金属基复合材料(PMMC)的方法固态法和液态法,介绍了PMMC的最新技术及研究现状。     

现代组织理论取向的中国大学组织创新设计策略

从古典组织理论、行为科学组织理论到现代组织理论,组织理论在思维方式、研究对象、组织结构形式方面发生了根本的转向。为了应对21世纪复杂的、不确定的环境,提高高等教育的质量,中国大学组织必须变革以往科层制、政治化色彩浓厚,而学术性不突出的组织结构。主要策略为:分散大学组织权力,模糊大学组织职责,淡化大学组织结构边界,多元组织结构整合,促进大学组织交往。     

胺基甲基-4-硝基苯酚衍生物的合成研究

制备了四只 DIAR成色剂的定时基化合物,通过了红外、核磁、质谱对该化合物的结构及物理性质的测定。     

Smoking behavior, knowledge, attitudes and practice among health care providers in Changsha city, China.

With the smoking epidemic in China, the role that health care providers (HCPs) could play in tobacco control will be critical. As a preliminary step, this study identified smoking behavior, knowledge, attitudes, and practice (KAP) regarding smoking and smoking control among HCPs in Changsha city, China. The study design was cross-sectional. The instruments - Demographic Information Scale and KAP Scale - were distributed to 420 physicians and 400 nurses in four hospitals in Changsha city. The effective response rate was 77.56% (636/820). Among the respondents, 20.8% were current smokers, which represented 35.7% of the physicians and 1.4% of the nurses, and 43.0% of the males and 1.2% of the females. The mean knowledge score was 22.3+/-4.4 (n = 30). Knowledge regarding smoking's harmful effects and smoking-related respiratory system diseases was high. Nonetheless, tobacco addiction was underestimated. The mean attitudes and practice score was 17.7+/-2.3, 15.1+/-3.4 (n = 20). Eighty-seven percent approved their role in smoking control, but only 45% HCPs practically informed patients about methods of smoking cessation. Smoking behavior was negatively associated with KAP, and 59.7% of the HCPs thought that inadequate knowledge affected their practice. In conclusion, HCPs had some knowledge and positive attitudes regarding the cessation of smoking, but were relatively unoptimistic regarding putting smoking control into practice. The high smoking rate among male HCPs and knowledge insufficiency about smoking may pose barriers in tobacco control efforts for HCPs. As such, interventions for the cessation of smoking, and continual education on smoking control for HCPs, are indicated in China.     

APV缔合型清洁压裂液室内评价

清洁压裂液作为一类新型的低伤害压裂液,因其优良的特性在储层压裂改造中有良好的发展应用前景。为了对压裂施工设计提供必要的参数,通过室内试验的方法对APV缔合型清洁压裂液体系中温区配方进行了评价。结果表明:APV具有很好的耐温耐剪切特性和时间稳定性,在中温地层中能很好地满足施工的粘度要求。通过粘弹性测试得出该流体为强冻胶,在整个扫描过程中损耗模量低于储能模量,表现出以弹性行为为主,在相对低粘度时仍具有良好携砂性能。少量的破胶剂即可使此压裂液在4 h后完全破胶,随着破胶剂份量的增加,在一定程度上可以提高破胶速度,破胶液粘度小于3 mPa.s,具有很好的破胶性能,与地层配伍性良好。在实际使用中,可以采用改变破胶剂浓度来控制此清洁压裂液的破胶速度,更好地满足压裂施工的要求。     

Economic analysis of upgrading aging residential buildings in China based on dynamic energy consumption and energy price in a market economy

This article employed a standard LCC to conduct economic analysis of upgrading the aging residential buildings in China. According to the current situation, an interest rate of 6%, an inflation rate of 3%, an increase rate of annual energy savings of 2% and an increase rate of electricity price of 2% were assumed in the method. The results indicated that only relying on gradually increasing electricity price and governments' subsidies was not enough. After detailed analysis of the energy saving measures and the distribution of all benefits from building energy retrofit, it was found that actually only 1/3 of original cost was spent only for energy savings, the second 1/3 for both energy savings and good façade appearance and occupants should share the last 1/3 because even if without energy retrofit, they would have to pay the part too. The corresponding results proved that the first 1/3 of investment cost could be drawn back within the residue life cycle, and so the investment could be accepted in a sheer market economy. In the end, a model about distribution of investment cost of and benefits was proposed to adapt the market economy to overcome the financial problems in China.     

直通式上成形器：高档文化纸纸机改造的有效途径

介绍了直通式上成形器的结构，性能及使用。其主要优点是：两面差小，成形质量好，两面脱水易调，适应车速低，结构简单，造价低。