Advanced Materials Research Vols. 433-440

Abstract: Controlling the concentration of contaminants in wards to prevent airborne infection is an important issue in hospital. The effect of supply airflow of down-feed air curtain, which locates between patients and doctors/nurses, is to separate wards into two spaces, one for patients and the other for doctors/nurses. The controlling effects of air curtain on contaminants emitted by patients are numerically simulated under different air arrangements. In a laboratory model, the smoke of burning Zang incense serves as the source of contaminants. Particles’ concentration of contaminants was tested with a laser particle counter at different sites whether the air curtain was running or not. Draughty feel on patients caused by supply airflow of air curtain was researched in this study. Results of the present study revealed that air curtain could control contaminants effectively, and the supply airflow did not make patients discomfort basically. Finally, the appropriate air outlet location and distance between air curtain and patients were suggested.

Abstract: The research deals with the issues and handling regarding the safety of complexly-structured round water pressure blast of cisterns, including calculating the safety-needed explosive quantity, explosive distribution mode, pre-treatment before the blast, safe construction and safe checking. The research specially focuses upon some safety issues and a general introduction to the safety measures to take in the project. Similar projects can also refer to it.

Abstract: The methanogen medium, supplemented with malate, succinate and glutamate, was used as substrates for high biogas yield by M. soehngenii YH. The fermentation medium was optimized by response surface methodology. First, more compatible concentrations of malate, succinate and glutamate were ensured. In the second step, the concentrations of the three supplemental nutrients above were further optimized using a Box–Behnken design. The average biogas yield (450 mL), 61% higher than those of the control in five independent samples, was obtained on the laboratory scale with optimized initial additions of malate, succinate and glutamate corresponding to 0.52 g/L, 1.06 g/L and 0.33 g/L, respectively. These would lay a foundation for increasing the efficiency of biogas synthesis and exploring a late-model culture technics of M. soehngenii.

Abstract: This paper derived from the desire for a better understanding of the challengers faced by the green heart of Changsha-Zhuzhou-Xiangtan agglomeration, advancing the developing strategy of Green Heart from multiple aspects such as coordinated management of regional scale, the growing pattern of ecological layout, efficient composition and space optimization as well as “Green” industry operations. Based on regarding Yijiawan district as strategic core, Zhaoshan scenic resort as Green Lung, this visualization anticipates the spatial layout pattern of Green Heart in which the demonstration zone is surrounded by Muyun cluster, Tiaoma cluster and Longyunxian cluster in the form of circular sector. In comparing status quo with succeed domestic and foreign case, the conclusion “One heart with Eight Clusters” is drawn.

Abstract: Forests are of interest from a wide range of perspectives simply because they serve many purposes, including timber products, watershed protection, wildlife habitat, carbon sequestration, recreational opportunities and aesthetic values. However, degradation or changes in forest ecosystem function and condition arise from changes in forest loss and fragmentation. In this study, based on the 1995 and 2005 land use/cover data for China, mathematical morphology coupled with the percolation theory was adopted to temporally assess changes in forest fragmentation patterns in 36 forest ecosystems of China through classifying each forest pixel into one of the six fragmentation components (interior, perforated, patch, edge, transitional and undetermined) by using the sliding window analysis technique to establish spatially explicit forest fragmentation maps. Additionally, landscape indices were also involved in the assessment of forest fragmentation status and trends. Results revealed that an accelerated fragmentation was observed in most forest ecoregions, especially in Daurian forest stepp, Hainan Island monsoon rain forests, and Northern Indochina subtropical forests with a sharp change in fragmentation patterns. The increased fragmentation was evidenced by a decreasing share of interior forest and an increasing trend of area share for perforated forest, patch forest and edge forest. In addition, derivations of geospatial indices from another three selected typical forest ecoregions also further confirmed the accelerated fragmentation. The increased fragmentation in most forest ecoregions of China was primarily driven by anthropogenic disturbances, including illegal logging, agricultural encroachment, infrastructure construction. Additionally, forest fragmentation maps provided valuable insights and implications regarding the development of land use strategies, habitat planning for rare and endangered species, and sustainable forest management. By utilizing the changes in fragmentation maps, such as the variation in location of the interior and perforated components, human can make effective risk assessments and crucial targets for protection and remediation.

Abstract: Paper removed due to author's request.

Abstract: As a weak point, bottleneck plays a crucial role in improving the property of the whole water system. In this paper, sensitivity computation formula is defined and corresponding mathematical model is established to confirm the bottleneck of water network. And the case proves that the bottleneck streams and units can be easily confirmed by the method in this paper.

Abstract: As a main theme of the 21st century, sustainable development is turning a new page in the development of human civilization, which is justifiably resulting in the conception of “Green Building”. This paper defines green building and green housing, analyzes their profound significance and probes into approaches to realize such designs.

Abstract: The potassium permanganate chemicals (PPC) was used to enhance the chroma removal of the typical raw water in northeast China. Two dosing points were investigated for PPC application and the optimized dosing point and an optimized dose of 0.5-1.5 mg/L were determined. The results showed that the PPC could solve the problem of chroma residual. The turbidity and COD_Mn removal were also increased. The PPC was a good alternative of polyacrylamide as coagulation aid and could save some cost.

Abstract: GPSRTK and depth sounder technology provides a foundation for outdoor digital sampling of waterway dredging quality inspection. The gathered sample data can be used by Surfer to develop a 3D underwater topography model. Surfer can create 3D visualization through 3D space analysis, makes precise calculation of underwater earthwork load possible. Based on the Hangzhou-Ningbo canal dredging project, this paper describes the applied work principle and procedure of Surfer in quality inspection of waterway dredging. The technical aspect of cross section surveying and quality inspection is also analyzed. Surfer can adopt Trapezoidal Rule, Simpson’s Rule and Simpson’s 3/8 Rule to calculate volume. This paper performs error analysis on the results of each algorithm and proves the accuracy, reliability and efficiency of Surfer in waterway dredging quality inspection.