Advanced Materials Research Vol. 742

Abstract: The use of recycled aggregate to produce new concretes has become increasingly widespread, and numerous studies have demonstrated that the final product performs similarly to traditional concrete. However, construction and demolition waste (CDW) presents certain characteristics which could limit its acceptance in the construction sector due to worse performance than natural aggregates. One example of this is water absorption, which in recycled aggregates reaches such high values that the amount of free water calculated for mixing the concrete is affected, consequently impacting on the concrete's properties, especially consistency. This paper reports the possibility of solving this problem with a simple and inexpensive method; pre-saturation of recycled aggregates prior to adding them to the mix. The results of two different pre-treatments are compared; one consisted of immersing the aggregates in water for 10 minutes and the other, in addition to the above procedure, included a brief period of air drying and subsequent elimination of surface water from the aggregate. Both pre-treatments were found to solve the problem of consistency.

Abstract: A new type of foam fractionation column with spiral internal had been designed for enhancing the foam drainage and thus for the removal of minute hazardous materials. Chromium was separated from wastewater using the continuous foam separation method. According to the similar physical behavior of foam separation and chemical reaction processes, the equivalent chemical reaction constant was introduced, Establishment concentrate distributed mathematical model of the whole tower under the condition of continuous foam separation with SDS as active agent. The model has been tested by experiments. The result indicated that foam separation process could be regarded as a first order reaction, and diffusion coefficient was 4.86cm²/s.

Abstract: Endocrine disrupting compounds (EDCs), such as estrone (E1), estrodiol (E2), estriol (E3), 17α-Ethynylestradiol (EE2) and bisphenol A (BPA) were biodegraded by Pseudomonas Putida. Under the fixed conditions of inoculums size and substrate concentration, the influences of enhanced conditions, such as carbon source, nitrogen source and ultrasonic power, had been investigated. The biodegradation rates of EDCs have increased by 16.98-40.15% and 18.37-24.86% after adding carbon source and nitrogen source, respectively. Ultrasonic power can improve the biodegradation rate by 14.09-24.66%. Meanwhile, the biodegradation rate could be up to about 90% under the external conditions. The study provided a basis for the enhance control of EDCs and other contaminants.

Abstract: The study on the effects of three unary and binary micro-catchment mulching methods including film mulching ridge and ditch plantation, film-mulching ridge and ditch film-mulching plantation and film-mulching ridge and ditch film-mulching straw plantation on growth of corn and different precipitation years was conducted in allusion to the low and unstable yield of corn in the western Liaoning province of China and in comparison with the traditional plantation model. Under the condition of this experiment, through film-mulching ridge and ditch film-mulching plantation and film-mulching ridge and ditch plantation, the time for seedling emergence of corn was shortened and the emergence rate of corn was increased. Through film-mulching ridge and ditch film-mulching straw plantation, the time for seedling emergence of corn was prolonged and the emergence rate of corn was increased in median water or dry years, but the emergence rate of corn was reduced in the high flow year. By contrast to traditional plantation model, film-mulching ridge and ditch film-mulching plantation and film-mulching ridge and ditch plantation boosted the increase in plant height and leaf area of corn and promoted dry matter accumulation in the early period of growth while the growth was slow, the plant height, leaf area and dry matter accumulation was always at he minimum value through film-mulching ridge and ditch straw mulching plantation in the early period of growth, but the growth rate was expedited in the late period during growth. Through film-mulching ridge and ditch straw mulching plantation, due to many reasons such as the growth process ahead of schedule and high temperature, the signs of precocity or premature senility come into being and leaf area and chlorophyll content decreases swiftly; through film-mulching ridge and ditch straw mulching plantation, the descent velocity of leaf area and chlorophyll content were reduced and the leaf senescence was postponed. In different precipitation years, the increases in water use efficiency of micro-catchment plantation were different, smaller in high flow year while larger in dry or median water year.

Abstract: Since the British first proposed the concept of "low-carbon economy", the international community had made a great effort in controlling greenhouse gas emissions and developing a low-carbon economy. However, the development of low-carbon economy is a top-down economic transformation driven by policy, which is different from the bottom-up economic transition driven by technology progress in the past. The influence of policy-making in low-carbon economy is everywhere, so the study of policy formulation and decision-making can be significant for low-carbon economy transition. This paper delivers a policy influence research method by constructing a regional low-carbon development model based on System Dynamics, and validates this model by comparing the simulation data and the Chinese calendar year statistics. Finally, some policy making suggestions based on the research are provided.

Abstract: Low carbon economy is the main direction of the future development of China. The hi-tech industry area has the features of tech-intensified, high energy consumption, high pollution, to develop hi-tech industry is good for the transfer from traditional industry to the low carbon economy mode. As a big province of China, it is imperative for Shandong Province to develop the low-carbon economy. Therefore scientific solution on carbon emissions of high-tech industrial area in Shandong province is a problem for government and academic workers to have to face and resolve. This paper analyzes the low-carbon economic situation of high-tech industry in Shandong province, and puts forward some countermeasures for low carbon economy development of high-tech industry in Shandong province.

Abstract: The construction of green building is a highly complex systems engineering, it not only includes stage of construction, but also the whole process, and all the life cycle of "green management". Meanwhile, the key point of green building construction management is not only a kind of construction technique, but also a comprehensive "green management". Therefore, this paper established the green building construction management model under the idea of sustainable development, which contained the whole life cycle and the full range of green construction management, and put forward some feasible suggestions on the implementation of green construction management.

Abstract: The paper used 6S radiative transfer model to study aerosol optics thickness retrieval in Chuxiong prefecture with MODIS image on January 12th, 2008, the results showed that: the mean, the minimum, the maximum and standard deviation aerosol optics thickness were 0.115644, 0.075, 0.337 and 0.099680 in Chuxiong prefecture. Aerosol optics thickness of the east and south was higher, that of the north and central are low, especially west. Lufeng county, Shuangbai county and Wuding county were in the top three of the maximum aerosol optics thickness. Lufeng county, Shuangbai county and Yongren county were in the top three of mean aerosol optics thickness, Lufeng county, Shuangbai county and Yuanmou county were in the top three of aerosol optics thickness standard deviation.

Abstract: The potential of CO₂ emission reduction expected in the next 10 years of China's construction was studied with the the method of scenario analysis. The results showed that a total of 11.008 billion tons of CO₂ would be reduced in chinas construction in the period of 2011-2020 and the contribution of CO₂ emission reduction in China's construction to the potential target of CO₂ emission reduction would be 48.07%.

Abstract: Healthy urban river ecosystem is the important symbol of the sustaining development of a city. This thesis discussed the issues of the ecosystem health situation of Panlong River, an urban river in Kunming city. This can provide the reference and scientific strategy for the government to renovate the urban river comprehensively. Using the comprehensive index evaluation method, we selected some indicators to characterize the main features and functions of urban river ecosystem to establish a comprehensive index system for evaluating urban river ecosystem health. These indicators included six aspects: water quality indicators, aquatic life indicators, hydrology indicators, river channel indicators, riparian zone indicators and social indicators. Total of them are 20 indicators. And the evaluation criteria was ascertained. Analytic hierarchy process (AHP) method was used to determine the weight of the indicators and the comprehensive assessment model was also built. Pilot study results indicate that the ecosystem of Panlong River in Kunming city is in the health status in 2011. The results showed that the comprehensive renovation of the Panlong River was very effective. Based on the ecosystem health assessment results of Panlong Rive and evaluation score of each indicator, we made certain the limiting factors that affect the urban river ecosystem health, which are vegetation of riparian zone, the water quality, aquatic habitat, the curve situation of the river channel, the form of bank protection, etc. And some suggestions were also provided for Panlong River ecological restoration.