A dynamic analysis of environmental losses from anthropogenic lead flow and their accumulation in China

Substance flow analysis was applied to analyzing the lead emissions in 2010. It turns out that in 2010, for every 1 kg of lead consumed, 0.48 kg lead is lost into the environment. The emissions in 2010 were estimated to be 1.89×10^6 t, which were mainly from use （39.20%） and waste management＆recycling （33.13%）. The accumulative lead in 1960-2010 from the anthropogenic flow was estimated and the results show that the total accumulative lead in this period amounted to 19.54×10^6 t, which was equivalent to 14.26 kg and 2.04 g/m^2 at the present population and territory.

Evaluation of environmental factors to fatigue performance of asphalt mixes

This paper studies the effect of different environmental factors, including the axle load weight, environmental temperature, vehicle speed, and the aging level of asphalt, on the fatigue performance of asphalt mixes based on four-point bending beam fatigue tests. A fractional factorial design method named ＂uniform design＂ was applied in experimental design. The relations of the environmental factors to initial stiffness, fatigue life, phase angle and cumulative dissipated energy were established with the general linear modeling method. It is found that there exists very good correlativity between the environmental factors and the fatigue performance indices of asphalt mixes. The coefficients of total correlation are mainly beyond 0. 95. The results indicate that the consideration of the effect of environmental factors is necessary in the fatigue performance evaluation on real asphalt pavement.

产权制度的代谢机制障碍及其变革突破--经济生态学视角

产权制度的发展创新与改革问题是探索社会主义基本经济制度的有效实现形式的核心。从经济生态学的角度讲,经济系统也存在饱和效应与积累耗散规律。因此,现代经济发生经济危机等问题的根源在于传统产权制度缺乏必要的持续代谢机制。而创新劳动股权这一新型产权形式对于构建现代产权制度——劳动股权与传统公有、私有产权等形式的多元整合并存——具有明显优势。而用混合所有制改造国有企业是产权制度变革的现实实践路径,在此过程中推进劳动股权发展就显得尤为必要。