Applied Mechanics and Materials Vols. 361-363

Abstract: The construction industry in China has undergone continuous development over the past decades. In relation to this, the quality of the outdoor environment in China has received increased research attention. This paper takes the Tahiti Villas located in Kunming District as a case study, using post-occupancy evaluation to identify and evaluate the main factors affecting the activities of the residents. The results indicate that humanistic design is mainly reflected in the concern for the user exhibited by the design. Thus, giving users primary importance can satisfy the design goals of rational expression.

Abstract: Rational fertilization is the guarantee for the productivity and stability of crop and sustainable development of rain-fed agriculture. In this study, based on a long term fertilization experiment initiated in 1984, we researched the effect of different fertilizer application on soil water profile distribution and water use efficiency (WUE) from 1999 to 2010. The experimental design consisted a control treatment (CK) and eight fertilizer treatments: farmyard manure (M), farmyard manure and nitrogen (MN), farmyard manure and phosphorus (MP), nitrogen and phosphorus (NP), nitrogen, phosphorus and farmyard manure (NPM), nitrogen and potassium (NK), phosphorus and potassium (PK), nitrogen, potassium and potassium (NPK). Soil moisture content of MN, MP, MNP, M, and NP were significantly lower than Ck in 10-130 cm, while NPK and NK was only slightly lower than Ck. Compared with the CK, on average, treatments MNP and NPK increased the yield of crop by 259% and 226% and they also increased the crop WUE by 202% and 176%, respectively. The results indicated that the fertilizer application of NPK might be the best choice for the sustainable development of arid land agriculture on the Loess Plateau of China.

Abstract: To improve the air change rate under natural ventilation and the comfort level of sport field of national fitness centers in hot and humid areas, an analog computation was conducted for courtyard models with different sizes and shapes via the softwares such as Fluent and Weather Tool, taking Guangzhou area as an example. It is discovered that under the same external conditions and in a certain building boundary size, enlarging the width of courtyard is beneficial for improving indoor ventilation of sport spaces with the same depth, and semi-open courtyard can lead to better ventilation compared with completely open courtyard with the same width.

Abstract: The article analyses the influencing factors and harm that road construction on environment, put forward the method of increasing environmental supervision and protection in engineering and promote the harmonious development of Chinas road construction and environment.

Abstract: Extremely high atmospheric boundary layer is observed over the arid area in Northwest China during late spring and early summer in 2000. By using the community mesoscale weather research and forecasting/Atmospheric Chemistry model (WRF-Chem), numerical simulation is performed to study chemistry tracer diffusion in the extremely high atmospheric boundary layer. Results show that the extremely high atmospheric boundary layer has great influence on the chemistry tracer transportation. The influence is more effective than that driven by wind which is limited by the local terrain. The tracer is controlled in low-level concentration during the daytime but increases rapidly during the nighttime. Sensitive experiments are performed by disturbing soil moisture and albedo to further investigate surface forcing on the atmospheric boundary layer height and the chemistry tracer concentration. It shows that soil moisture or albedo is disturbed as increasing makes the tracer concentration increase in low layer for response of ABL height decrease.

Abstract: Urban construction works produce wastes of mud, silt and silts. Through an environmental economic analysis of the waste disposal and an investigation of the existing management mode, it can be seen that the managements of those waste in Shenzhen--instead of regarding those as resource--are more for imminent discharges which results in the waste of soil and the pollution of the environment. Based on the idea of ecological sustainability, this paper puts forward a mode for the overall process of managing the construction wastes in Shenzhen, which can be divided into four aspects: reduction at source, optimization of the transportation, comprehensive utilization and efficient disposal. In the end, the paper brings up a management mechanism suitable for the overall process from the perspectives of technology, legislation, management and social awareness.

Abstract: According to the analysis of planning and design current conditions of Wu River Wetland Park, the design principle,objective and function positioning can be determined. The most participant wetland park will be built by suing three-dimension layered layout, constructing four functional level,building complete landscape structure and vision analysis, striving to highlight the characteristics of overall structure design.Reframing site texture, the most participant wetland park will be built through establishing a complete ecological system and visual landscape, building perfect recreational network and function nodes.

Abstract: Qinhuangdao coastal wetland is the distribution of China's most representative of the sandy coastal wetlands, and its main wetland types are sandy coast wetland, rocky coast wetland, estuarine wetland, lake wetland, shallow sea wetland and artificial wetland. Under the influence of natural factors and human factors, coastal wetlands degradation constantly. Land reclamation, city and port development, pollution, coastal erosion and excessive use of coastal biologic resource are considered as the main factors to the degradation of the coastal wetlands. Based on the analysis the main factors contributing to the loss and degradation of the coastal wetlands and the characteristics of wetland degradation, sustainable development countermeasures are suggested in this paper.

Abstract: Antibiotics have played a positive role in human health and. But underutilized antibiotics can’t be removed by normal treatment. The paper study the impact of fiber optical reactor catalytic degradation of oxytetracycline and step to examine the degradation effect. The results show that: temperature increases within a certain range contribute to the degradation of the oxytetracycline. Effects of pH on the photocatalytic reaction were significant, and alkaline conditions is more conducive to oxytetracycline photocatalytic degradation. In the concentration range of the experimental study, oxytetracycline photocatalytic degradation was inhibited by the higher initial concentration. Catalyst promoted oxytetracycline degradation, its addition amount on photocatalytic reaction influence is relatively large, when the pH is 7, with the increase of nano-TiO₂ dosage, removal rate was gradually increased. The degradation rate of oxytetracycline in different reaction process can be shown as: photocalysis＞photolysis＞hydrolysis in this research.

Abstract: By study features of recovering vegetation and physics and chemistry characters of soil in embankment slopes of 3 years and10 years respectively, the correlation among those factors were investigated . The results show: the physics and chemistry characters of soil vary observably with recovering process; Soil bulk density decreases while soil moisture, TP, TN and organic matter content increase evidently; Although the coverage of vegetation changes little, the structure of vegetation community becomes more complex and spatial distribution is more even; The correlation between spatial distribution of vegetation and characters of soil is most remarkable. With process of restoration, the vegetation is affected more effectively by water and nutrients in site.