Applied Mechanics and Materials Vols. 522-524

Abstract: As the society ages, the number of falls and fractures suffered by the elderly is increasing significantly in numbers. However, studies with reliable statistics and analysis on falls of this specific population were scarce. Fractures due to falls of the elderly are potentially of critical severity, and, therefore, it is important to detect such incidents with accuracy to prevent fractures. This necessitates an effective system to detect falls. For this reason, we induced simulated falls that resemble actual falls as much as possible by using a fall-inducing apparatus, and observed the movement of the body during the falls. The movement of the body was sensed using 3-axes acceleration sensors and bluetooth modules, which would not obstruct the movement as wired sensors or movement analysis systems would do. Using the acceleration data detected by the sensors, a fall detection algorithm was developed to detect a fall and, if any, its direction. Unlike existing studies that used sum-vectors and inclination sensors to detect the direction of falls, which took too much time, the system developed in this study could detect the direction of the fall by comparing only the acceleration data without requiring any other equations, resulting in faster response times.

Abstract: A simple method for synthesis of nanoselenium using oyster polysaccharides as soft template was investigated. The uniform stable selenium polysaccharides were obtained under the condition of reaction temperature 40°C, reaction time 3 h-5 h, the content of oyster polysaccharides 400mg/L and the content of sodium selenite 1mM. The size distribution and morphology of the product were confirmed by scanning electronic microscopy (SEM) and tansmission electronic microscope (TEM). The antioxidant activity of nanoselenium polysaccharides were studied in vitro. The results showed that nanoselenium polysaccharide is an effective hydroxyl radical and DPPH radical scavenger.

Abstract: Cordyceps militaris has similar chemical composition, nutrition value, and medicinal functions as Cordyceps sinensis. However, its main medical composition such as cordycepin is much higher than that of the wild C. sinensis species. In addition, it is easier to cultivate artificially than C. sinensis. Thus, C. militaris is chosen as the best substitution for C. sinensis. This paper introduces the pharmacological effects of C. militaris and the effect of selenium on human body. It also summarizes ways of improving the content of selenium in artificially cultivated C. militaris and the optimal conditions for its cultivation. Low concentration of selenium in the medium can stimulate the growth of C. militaris mycelium. However, selenium of high concentration in the medium prevents its growth and decreases the conversion efficiency from inorganic to organic selenium.

Abstract: The experiment was carried to study the fermentation regularity of different maturity, so as to provide theoretical basis for the effective storage of Lingwu long jujubes. The results showed that with the increase of maturity, the fermentation rate of fruits also increased, and the fermentation rate of eight, nine, ten mature fruits had significant differences, and the seven, eight mature were not. Based on the fermentation regularity and other quality indicators, the conclusion was that the storage of Lingwu long jujubes should be appropriate to eight mature jujube.

Abstract: Heat island effect has been a prominent environmental problem that impacted the urban sustainable development at present, and then Remote Sensing (RS) and Geographic Information System (GIS) were served as the powerful tools for the research of urban heat island effect. In this paper, Landsat imagery of coastal zone in Qingdao served as data source was collected, and the Land Surface Temperature map in 1995, 2000, 2003, 2009 was obtained through GIS software. The results indicated that (1) heat island of study area distributed in the rapid urbanization and industrialization regions with high population density while low plant cover degree; (2) the distribution of heat island changed largely among different years; (3) human activities were the dominant driver to the urban heat island.

Abstract: In order to study steam network of Ebinur Lake Basin of Bortala Mongol Autonomous Prefecture, SRTM-4 DEM data and ASTER-2 GDEM data were used as the basic topographic data and ArcGIS HydroTools was utilized for extension module so as to study on extracting digital drainage network of watershed based on surface runoff model, as well as to compare the two extraction results. The result showed that ASTER-2 GDEM data is more suitable for stream network extraction with large and medium scales than SRTM-4 DEM data. Simulate digital network method by correlation analysis of choosing an appropriate flow accumulation threshold will make the generated network match up to the factual drainage network on 1:250000 scale topographic map much better. Meanwhile, the veracity of simulation results has also been ensured for further hydrological analysis.

Abstract: The characteristic points matching is the hot point in the aerial images processing. The matching algorithm of characteristic points based on epipolar line was put forward according to the characteristics of aerial images. This algorithm overcomes some problems in the process of image sampling, solves the matching problem of untextured regions better, and deletes the dissimilarity points, shortens the calculation time greatly as well.

Abstract: This paper first introduces geological background of the Three Gorges Reservoir and then reviews composition of the Three Gorges GNSS deformation monitoring network. The GNSS monitoring strategy from 2010 to 2012 is elaborately analyzed from technology design, field observation, data processing and deformation analysis. vertical deformation showed a subsidence trend in around the dam and near the Yangtze River，Vertical deformation showed a uplifting trend in TG14 station and TG13station. The results show that the three-year’s variation of the crustal deformation is small, and then the surface structure variation is stable in present around the Three Gorges Reservoir area.

Abstract: The paper used decision tree automatic threshold classify model to study land use and land cover in Shangri-la County with Landsat ETM+ image in 1999, and got two results. The first result is the land use and land cover map, the second result is the surface features area statistical result from large to small: bush, spruce and fir, meadow, pinus densata, ice and snow, pinus yunnanensis, unutilized land, paddy field, town, dry land , marsh, water. Bush has the largest area, 4267492200m², while water has the smallest area,6147900m².

Abstract: In the application of ground penetrating radar (GPR) to detect roadbed diseases, this paper designs a kind of auxiliary system for GPR to solve the problems ,such as how to obtain precise location of the diseases and how to explain the causes of the roadbed disease more reasonably. Combined with the actual test results, this paper discusses the feasibility and superiority of the auxiliary system in quality inspection of highway roadbed.