Applied Mechanics and Materials Vol. 700

Abstract: The endemic fluorosis in western Guizhou Province,southwest China was confirmed to be collected with high-content fluorine in topsoil (clay for coal-burning) of Hehua Village, Zhijin County,Guizhou Province ,which was considered to be closely associated with the long-term occurrence of endemic fluorosis. The new discovery in this article confirms that the mean value of apparent acidity of topsoil (pH_a) in this village is 4.92;The measured average value of total sulfate radical was 4465μg/g. In addition, the apparent acidity and the content of total sulfate were positively correlated (correlation coefficient:0.7920).The result shows that the topsoil in this village is acidic and may belong to sulphation.

Abstract: In order to investigate the mature law of Korla fragrant pear with mathematics method, Korla pears in Aksu area be taken as the study object, and the fruit hardness and soluble solid content (SSC) be selected as the research index. The data of the two indices in the mature process are analyzed with Excel, SigmaPlot and Matlab. To draw the change rule of indices and establish the mathematical mode. The research shows that the effective accumulated temperature reaching up 3000°C to 3843°C is main mature stage of the Korla fragrant pear, and there is an accelerating stage in which. The change rule can be precise description by the established mathematical model that can provide reference for fruit maturity modeling.

Abstract: This paper studied the vertical distribution of heavy metals in sugarcane soils by using sugarcane vinasse. The results showed that the sugarcane vinasse not only reduced the pH value of the sugarcane fields, but also increased the concentration of organic matter. The Cu content decreased with soil depth, and six sampling points appeared peaks in the range of 30~40cm.There was not obvious change of Cd content in soil depth of 0~60cm. And the content of Zn and Pb showed different changes with different sampling points. The study also showed that the mobility of four heavy metals followed the order Cu> Zn> Pb> Cd. Besides, the content of Cu and Cd in some layers were exceeded soil background value of Guangxi. The geo-accumulation index indicated that the 36 samples collected from different layers were not contaminated by Cu, Zn, Pb and Cd, and the sugarcane soils were in clean state.

Abstract: Reference crop evapotranspiration (ET₀) is a key to estimate crop water requirements, and also an important component of irrigation schedule and water resources planning, sensitivity analysis are crucial in assessing the impact of climate changes in ET₀ estimations. In this study, based on the daily meteorological data of 18 meteorological stations in Shanxi Province from 1961 to 2000, the daily ET₀ values were calculated using Penman-Monteith equation recommended by FAO-56. The trends of climate variables were detected by using Mann-Kendall test. Sensitivity coefficients were employed to predict responses of ET₀ to five climatic variables, combined with annual of meteorological factors quantitative analysis of ET₀ changes. The results show that statistically significant decreasing trends are observed in wind and daily sunshine hours in Guanzhong and southern Shaanxi. Relative humidity has a significant decreasing trend in northern Shaanxi. In general, ET₀ value is on the decline; relative humidity is the most sensitive variable, followed by solar radiation, daily sunshine hour, wind speed and mean temperature. The change of ET₀ is primarily attributed to the significantly decreasing in wind speed and sunshine hour.

Abstract: In order to better protect the karst groundwater resources of Feicheng Basin, paper evaluated the groundwater pollution disaster based on the groundwater pollution investigation of the study area. Results show that the high pollution disaster areas are mainly distributed in plain area of Feicheng Basin, the moderate pollution disaster areas are mainly distributed in the downtown of Feicheng City and Wangguadian Town, the rest of the area are the low pollution disaster area.

Abstract: Toxic data of local fishes was very essential in the derivation of local water quality criteria. In this study, two local fishes (S.dabryi and P.parva) of Liao River were chosen to conduct 96-h acute toxic data under ammonia (total ammonia) whose pollution was proved to be serious in Liao River. 96 h LC50s of S.dabryi and P.parva under total ammonia were 35.36 mg/L (pH=7.50, T=20.00°C) and 30.35 mg/L (pH=7.50, T=20.00°C), respectively. These toxic values could be used to supply the local database which was the basement to formulate site-specific water quality criteria accordingly in Liao River.

Abstract: The acquisition vegetation phenology information by using time series of satellite data is an important aspect of the application of remote sensing and climate change research . Based on the MODOS NDVI time series of images in 2000-2010, Dynamic threshold method and GIS tools were used to extract the vegetation phenology parameters of Qinling Mountains in 2000-2010 , the accuracy of remote sensing phenology results was verified combined with the measured phenological data, And analyzed the characteristis of phenological variation and the relationship between temperature changes and the phenology of Qinling region,and quantified the extent of temperature change on vegetation phenology in a macro scale. Calculated :the trend of vegetation phenology variation based on the NDVI and the results of phenological data are consistent. Results show that NDVI has good revealed effect on vegetation phenology; From 2000 to 2010,it ahead of 1.8 days at the beginning period of vegetation phenology and late back 1.2 days at the end period ; The start phenology NDVI was generally greater than the late phenology on spatial distribution; The effective temperatures and the temperature in spring, growing period had a maximum influence on NDVI at beginning phenology period,the temperatures in summer and autumn had greater impact on the final NDVI .

Abstract: Microbial oils has been studied for many years, research shows that a variety of oleaginous microorganisms, such as yeast, fungi, bacteria, and microalgae can produce oils. The composition of microbial oils are C16:0, C18:1 and C18:2, The research of microbial oils focuses on food and Health care products other fields, especially in the field of bio-energy have been more and more attention, this paper introduced the development process of the microbial oils and the superiority of microbial oils in the bio-energy.

Abstract: This research has been conducted to investigate the compressive strength of Flemish bond spent copper slag masonry wall. The spent copper slag was taken from a shipyard and repair company in Pasir Gudang, Johor, Malaysia. In total three (3) sets of brick wall were built based on different percentage of spent copper slag replacement in bricks. The first set was arranged with 0% spent copper slag replacement bricks. It is used as the control set. The rest 2 sets were prepared by replacing 20% and 30% of sand in the bricks with spent copper slag. These bricks and walls were undergone physical tests such as compressive test, moisture content, density and leaching tests to satisfy the minimum requirement of a standard brick.

Abstract: Liaohe is one of our country key management “Three rivers and Three lakes” , Liaoning provincial government introduced a number of key policies to control pollution in the Liaohe River. Such as, local government leaders response for river pollution prevention in his Jurisdictions policy, source control and prevention policy, and so on. This articles makes river grading partition as guiding thought, and select microscopic scale’s three indicators-monitoring and assessment value ratio, the ratio of the total amount of pollutant emissions and water environmental capacity , environmental investment index as assessment indicators . These three indicators consturcted a Liaohe river management policy of river hierarchical governance and water quality achieve standard by period. The two ratios-monitoring and assessment value , the total amount of pollutant emissions and water environmental capacity’s value confirmation is based on Liaohe Tieling’s seven sections monitoring data. What this new water pollution hierarchical governance policy can do is support an positive and effective method for Liaohe river pollution prevention.