Applied Mechanics and Materials Vols. 178-181

Abstract: The environmental effects of the excavation works, which including retaining structures, pile construction, reducing the groundwater level, excavations on the surrounding environment, and performance in many ways. Reducing the underground water level can cause harmful result: the foundation settlement surrounding buildings and nearby underground pipelines. In addition, a large number of extracted groundwater is often discharged directly to the Sewage pipe network is a huge waste of water resources in cities. In this paper, the countermeasures are discussed based on the analysis of the problem.

Abstract: Application of environmental policies to prevent climate change, mitigation of climate change, the progressive reduction of emissions of greenhouse gases under commitments, encourage reducing energy consumption by using technologies that are efficient and support production of cheap and clean energy sources should be a priority for contemporary society. Given the above goals, the application presented in this article represents a model of how we addressed the question of the correct size of local wind turbines to provide energy coverage of a community. This method involves an analysis of environmental factors, followed by the analysis of wind in the area and continued to calculate the energy potential of the area and capable energy and wind turbines provided consumer choice

Abstract: Box-Behnken experiment design was used to optimize the enzymolysis technology of casein, and the antibacterial activity of casein peptides was evaluated. The optimum enzymolysis conditions was trypsin and neutral 1:1, pH7.4, temperature 44°C, substrate concentration 32g/L, E/S 2.5%, when the casein was hydrolyzed for 90 minutes, the antibacterial ability of peptide hydrolyzed from casein would reached 15%, and its antibacterial activity achieved a peak of inhibition ratio 82%. The results suggested that excessive hydrolysis products of casein would lose its antibacterial activity, but the modest hydrolysis product of casein has potential application value in antibacterial agent use.

Abstract: The distribution, enrichment, accumulation, and potential ecological risk of lead (Pb) in the surface sediments of northern Kaohsiung Harbor, Taiwan were investigated. Results showed that the Pb concentrations varied from 10.9–73.2 mg/kg with an average of 42.1±19.1 mg/kg. The spatial distribution of Pb reveals that the Pb concentration is relatively high in the river mouth region, and gradually diminishes toward the harbor entrance region. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of Pb pollution. Results from the enrichment factor and geo-accumulation index analyses imply that the sediments collected from the river mouth can be characterized between severe and very severe degree enrichment and between moderately strong and strong to very strong accumulation of Pb, respectively.

Abstract: Major objectives of this study are to evaluation the enrichment, accumulation, and potential ecological risk of cadmium (Cd) in the sediments of Love River mouth, Taiwan. Ten monitoring stations were installed near the mouth of Love River to collect sediment samples for analyzing Cd. Results of laboratory analyses show that contents of Cd in the sediments are between 0.27 and 1.25 mg/kg with an average of 0.74±0.33 mg/kg. The spatial distribution of Cd reveals that the Cd concentration is relatively high near the boundary of the river mouth, and gradually diminishes toward the harbor region. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of pollution. Results from the enrichment factor analysis imply that the sediments can be characterized as minor to severe degree of Cd enrichment. Results of geo-accumulation index analysis indicate that the sediments can be characterized as none to moderately strong degree of Cd accumulation. Results of potential ecological risk index indicate that the sediments at Love River mouth has moderate to high ecological potential risk.

Abstract: Surface samples were collected from the Jen-Gen River mouth, Taiwan and analyzed for polycyclic aromatic hydrocarbons (PAHs). Total PAHs concentrations varied from 283 to 1,277 ng/g, with a mean concentration of 671 ng/g. The spatial distribution of PAHs reveals that the PAHs concentration is relatively high in the river mouth region, and gradually diminishes toward the harbor region. Diagnostic ratios showed that the possible source of PAHs in the Jen-Gen River mouth could be petroleum combustion. The toxic equivalent concentrations (TEQ^carc) of PAHs varied from 43 to 169 ng TEQ/g. Higher total TEQ^carc values were found in the river mouth region. As compared with the US Sediment Quality Guidelines (SQGs), the observed levels of PAHs at Jen-Gen River mouth were lower than the effects range low (ERL), and would probably not exert adverse biological effects.

Abstract: This experiment mainly focuses on the influence of lead stress on the growth of dishlia. The result shows that under lead stress,the content of soluble sugar falls then rises as time goes by,while the content of saccharose rises then fall; the content change of starch and superoxide radical in experiment groups is similar to that in the control group but with lower content. Experiment results show that dishlia is tolerant of lead stress and increases such tolerance via soluble sugar,starch,saccharose and superoxide radical

Abstract: Highway tunnel is one part of the road project among highways located in the mountain areas, the mileage proportion covered by tunnels has become larger and larger, and naturally, tunnel has become an important part in highway construction. However, the environmental influence brought about by the tunnel construction deserves more attention. Combined with the particular environment of highway tunnel construction in northwest mountain areas of Hubei , this thesis accordingly puts forward the structure system of environmental organization, and some measures as well as suggestions on environmental protection, and aims at providing reference for environmental work of highway tunnel construction in mountain areas.

Abstract: The function of secondary metabolites has been a subject of debate since the first isolation and characterization of these often times structurally complex chemical compounds. By definition, secondary metabolites are naturally produced compounds that are not essential for the survival of the producing organism, as opposed to primary metabolites. Bioassays have revealed a wide range of biological activities, such as cytotoxicity, ichthyotoxicity, antimicrobial and antifeedant activity, antifoulant and anti-cancer activities. However, some of these activities are manifested against organisms that do not represent logical targets, since they would never be encountered by the producing organism in their natural habitat.

Abstract: Using titanyl sulfate and zinc sulfate and others as the main resources, we adopted separately sluggish precipitation method and co-precipitation method to prepare pure TiO₂ nano-powder and ZnO-TiO₂ nano-composite photo-catalytic materials. The authors used X-Ray Diffraction (XRD) to research crystal types of the TiO₂ nano-powder and ZnO-TiO₂ nano-composite photo-catalytic materials, and conducted experiments of photo-catalytic performance and light absorption performance of the samples that were made. The experiment results showed that the prepared TiO₂-ZnO nano-composite photo-catalytic materials are relatively ideal. The paper used visible light as the light source to realize the effective degradation of the organic matters.