bluuebunny/crossref_metadata_2025 huggingface dataset:
Rational Thinking of Sustainable Development of the New Type of Rural Communities
Authors: Liu Han Zhou
Published: August 2013

After elaborating the connotation of construction of the new type of rural communities and their sustainable development, and according to these goals, this paper puts forward persistent requirements about sustainable development of construction of the new type of rural communities, i.e. determining the function orientation, enhancing investment, attentions to scientific rationality of planning and construction; attentions to comprehensive utilization of resources; giving full use of farmers as the main role and promotion of cultural integration in community construction.
Research about the Change of Land Resources Ecological Security Based on P-S-R in Chongqing City
Authors: Guo Ai Qing , Wang Jing , Qin Ling
Published: August 2013

In recent years, the land resource ecological problems become more and more serious. And the study on ecological security of land resources becomes the frontier problems on Sustainable Utilization of land resources. Based on P-S-R model, this paper built the land resource ecological security index system. And it studyed the land resource ecological security status of Chongqing city from 2001 to 2010.The results showed that land resources ecological security situation of Chongqing city has been improved in recent ten years, but the security situation is still not optimistic. It needs further take effective measures and improve the land resources ecological condition.
Study on Land Reclamation and Ecological Restoration Models in the Perspectives of Ecological Civilization
Authors: Yu Yang , Wei Ting Ting , Xiao Wu , Yang Yao Qi , Wang Xin Jing , Gao Yang , Wang Pei Jun , Ren Hui Jun
Published: August 2013

As a core of the sustainable development, the ecological civilization construction is importment to realize the harmony on the process of the social and economic development between Human being and nature. By analying the status of the ecological environment destruction caused by coal mining activities in China, this paper summarizes and puts forward five modes for the land reclamation and ecological reconstruction (LRER). Simultaneously, the existing problems of the LRER are analyzed and the related necessary measures are concluded, providing the theoretical reference for future research and practice.
Thinking of Green Space System Planning of City New District Based on Sustainable Development
Authors: Fu Cheng Hua
Published: August 2013

Problems existed in the green space construction of city new districts, such as loss of ecological functions, the simple pursuit of quantity, high degree of landscape fragmentation. This paper took the concept of sustainable development as a guide, combined with new-district constructions of Sweden, Britain and Germany, the following proposals for green space system planning were put forward to realize sustainable development of new districts: planning should be oriented by ecological functions; positive interaction must be sought between green space system and the new-district space development; protection on the natural landscape resources and continuous landscape process must be strengthened; green space system planning should focus on the continuation of regional context.
The Physiological Change of Eupatorium denophorum Spreng under Pb Stress
Authors: Xiong Hua Bin , Duan Chang Qun , A Xin Xiang , Chen Ming Hong
Published: August 2013

Eupatorium adenophorumspreng is a global invade weed but is also an excellent enrichment plant for heavy metal. However, the characteristics of physiology is still not clear under heavy metals stress. The research focused on changes of plant height, basal diameter, leaf length and width, POD activity, protein content, chlorophyll content, electric conductivity and MDA content in different Pb concentration. The results showed that all indexes were descend in different extent in Pb condition, especially part indexes, such as plant height, soluble and insoluble protein and POD activity, were significant difference with control. But, combined treatment condition (500-2000 mg/kg) with these indexesEupatorium adenophorumspreng showed the better characteristics to as a pioneering plant for ecological restoration of some serious mining wasteland.
Analysis on the Change of Arable Land Area and its Driving Force in Hefei City
Authors: Zhang Hong Mei , Gao Yang
Published: August 2013

In recent years, the decrease of total arable land area and the area per capita of available arable land resource are serious problems in China. These problems will become more serious with the development of economy. In this paper, based on the statistical data of cultivated land in Hefei city from 1998 to 2009, their driving forces of the cultivated land change were analyzed by means of principal component analysis. The results showed the changing trends. The total and per capita of cultivated land were declining, but the speed of change was not the same. The sharp decrease was occurred in the period of 2002-2005. Nine affecting factors having influenced on cultivated land change which were analyzed by principal component analysis. The results show that population growth, economic development and efficiency of agricultural production were main driving forces affecting cultivated land change in Hefei city.
Resource Utilization of Medicinal Plant Erigeron breviscapus Cropland
Authors: Xiong Yong , Zhao Chun Yan , Ji Si Ping , Chen Yi Jian
Published: August 2013

Used Erigeron breviscapus Rhizosphere soil aqueous extract and mix soil (E. breviscapu Rhizosphere soil and vegetable field ) to cultivate three crops (Pisum sativum Linn, Chinese cabbage, Brassica campestris L), got investigated physiological and biochemical indicators of the above three crop seeds. The results show that seed germination rates, root length and fresh weight decreas with the aqueous extract concentration and rhizosphere soil proportion increase after Pisum sativum Linn was used. All of these physiological indicators of Brassica campestris clearly are not stable. Meatime, E. breviscapu Rhizosphere soil aqueous extract and mixed soil promote Chinese cabbage growth. Allelopathic sensitivity indexes of Chinese cabbage are positive value. So, Chinese cabbage can be as appropriate rotation crop with E.breviscapus. E.breviscapus cropland can also use to plant Chinese cabbage to achieve cultivated resource utilization.
Effects of Different Vegetation Types on Soil Microbiological Properties on the Loess Plateau
Authors: Zhou Feng Li , Xue Sha , Wang Bing , Liu Guo Bin
Published: August 2013

The re-establishment of natural species-rich health lands on abandoned farmland is one of the main measures in soil erosion control in the Loess Plateau of China. This study was conducted to understand how enzyme activities changed with nutritional properties and microbial biomass in different vegetation types in the loessial gully region of the Loess Plateau. Soil samples were collected in different vegetations which had planted for almost 30 years. For the collected soils, nutritional, microbial and enzymatic properties were determined. The result showed that soil nutritional properties and microbial biomass were enhanced in black locust-amorpha, compared with black locust, but weakened in Chinese pine-amorpha compared with Chinese pine. Besides, soil urease, α-amylase, alkaline phosphatase, catalase, saccharase and cellulase activities in creased with restoration, but decreased polyphenol oxidase. Moreover, urease activity was obviously high in korshinsk peashrub and black locust for the nitrogen fixation of them, and α-amylase was high in Chinese pine for low pH value. However, there still was a certain gap to Chinese arborvitae which was considered to be the climax community in the region. In general, the distance of vegetations to Chinese arborvitae was grassland > black locust > Chinese pine> korshinsk peashrub > Chinese pine-amorpha > black locust-amorpha.
Studies on Climate Potential Productivity of Dryland Farming in Fuxin of Liaoning Province
Authors: Bai Wei , Sun Zhan Xiang , Zheng Jia Ming , Wang Li Shuang , Hou Zhi Yan
Published: August 2013

Based on the meteorological data for the period of 1951-2009 in Fuxin,the article estimates the photosynthesis, photo-temperature and climate potential productivity of dryland farming in Fuxin of Liaoning province, and analyzes the potential productivity interannual change in crop growth period (April-September). The result shows that the long-time average value of the photosynthesis, photo-temperature and climate potential productivity are 31.89×104kg/hm2, 26.80×104kg/hm2and 18.29×104kg/hm2in Fuxin. The interannual change trend of potential productivity is that the photosynthesis, photo-temperature and climate potential productivity are overall reduced, the photosynthesis and photo-temperature potential productivity are not obvious, and the climate potential productivity is obvious. The monthly climate potential productivity contour maps show that the climate potential productivity change dramatically, and the low evalue areas of crop growth period have the continue expansion trend after 2009.
Changes of Land Use and its Prediction Based on CA-Markov Model in the Coastal Zone of Yancheng
Authors: Sun Xian Bin
Published: August 2013

For studying the influence of human activity on the change of land use type and ecological environment in coastal region, the coastal zone of Yancheng was selected to analyze the change of land use and spatial landscape pattern in the past 17 years by using geographic information system (GIS). The Markov model was applied to predict land use variation in the following 10 years. The results showed that: The land use structure in the coastal areas of Yancheng has undergone great changes from 1991 to 2008. It is demonstrated that the percentage of farmland area ascended from 36.42%. to 50.17%., and the artificial wetland area ascended from 9.96% to 20.22%,while the percentage of natural wetland area declined from 46.41% to 23.01%. Construction land increased five times (85.29km2) . Nature wetland, farmland and artificial wetland were the main land use types of research area with obvious reciprocal transformation. Nature wetland was mainly transferred to farmland and artificial wetland, and farmland was mainly transferred to artificial wetland and construction land in 1991-2008. The three types of time-space distribution extended to the coastal zone gradually. And the land exploitation activities became increasingly intensive. A series of landscape patterns changed because of severe human disturbance, such as obvious fragmentation, the dominance decrease, and the diversity and evenness increase, the degree of space across of the nature wetland and the artificial wetland increase. As a result of landscape fragmentation,ecological function in a landscape was declined. The simulated result by CA-Markov model indicated that cultivated land and artificial land continued to rise, the annual average increase rate of construction land was twice the earlier period and the reducing speed of natural wetland was 56.67% of the earlier stage. Between 1997 and 2018, the three types of land use (cultivated land, natural land and artificial wetland) have all extended to the coastal zone.
Study on the Function of Waters in the Ecological City Construction and its Optimization Strategy
Authors: Wei Heng
Published: August 2013

Analyzed the water environment situation of Chinese city, discussed the position and function of the water in the construction of ecological city, used methods of typical cases, revealed the severe problems of city water ecological environment, put forward the optimization strategy of water environment in the process of ecological city construction.
The Civilization of Ecological Environment and the City Planning of Jiaxing City
Authors: Guo You Nan
Published: August 2013

The reflection on the region, environment and ecology of Jiaxing is the subject which the author pays attention to chronically. In this article, on the base of regions south of Yangtze River, from the standpoint of environment and ecology, the author analyse Jiaxing roundly. The writer combines Jiaxings unique characteristics together, namely the water as the source, the green as the goal and the culture as the background, to show the ecological environment and ecological planning of this city, so as to endow Jiaxing with more ability of scientific development and make it clear and frofound for public to understand the livable ecological planning of Jiaxing.
Preparation and Characterization of PAN-Based Oxidized Membrane-Immobilized Zero-Valent Iron Nanoparticles
Authors: Liu Chun Yi , Li Xiang , Ma Bo Mou , Qin Ai Wen , He Chun Ju
Published: August 2013

A new membrane carrier was presented to immobilize zero-valent iron nanoparticles (ZVI NPs) for the removal of contaminants in water. The modified PAN-based oxidized membrane was prepared through acid treating method and used as a nanoreactor to chelate Fe (III) ions for the reductive formation of highly reactive ZVI NPs. The ZVI NP immobilized membrane system is stable and effectively degrades trichloroethylene (TCE). These results suggest that PAN-based oxidized membrane containing ZVI NPs exhibits the good properties and significant potential for environmental applications.
Application of Physical Polarization Water Treatment Technology on Circulating Cooling Water System of Power Plant
Authors: Zeng Dan , Fei Zhen Yi , Wang Min , Li Ying , Li Mu Sen
Published: August 2013

Physical polarization Water Treatment (PPWT) is a new technology that takes advantage of polarization electric field polarizing water molecules to achieve the purpose of scale inhibition and dissolution as well as killing bacteria and algae. The PPWT device made by Shandong Langkun Energy Conservation & Environmental Protection Technology Co., Ltd and running in the biomass power plant of Shandong Kaitai Group Co. achieved the effects of scale inhibition and solution which are even more superior to the traditional method of chemical dosing. It brings annual water conservation of 147600 m3 and economic benefits of hundreds of thousands to millions for forsaking chemical dosing for a 15MW power unit. Therefore, Considerable economic and social benefits and the goals required by the state to the enterprises of energy saving, emission reduction and environmental protection are achieved.
Chemical Control of Flavone from Forestry Waste C.cathayensis Exocarp on Nutritive Growth of Crops
Authors: Chen Xiang Ming
Published: August 2013

Using potted wheat, corn, soybean and mung bean as the materials, the effects of different treatments with six kinds of concentration ( 0.1 ~ 2.0 / mg.L-1 ) of flavone extract from C.cathayensis exocarp on the relative electrical conductivity, root activity, nitrate reductase activity and nutritive absorption of four kinds of newborn crop seedlings roots were studied. The results showed that within the range of concentration of 0.1~ 0.5/mg.L-1, the flavone extract promoted the nutritive growth of the four kinds of crops at seedling stage. The root activity of the wheat and mung bean seedlings were 0.29 and 0.35/ug.dg-1.h-1, 40-24% higher than CK, the nitrate reductase activity of the corn and soybean seedlings were 49.9 and 53.1/mg.L-1, with an increase of 54-24%. The effects of flavone extract on the four kinds of crop reached the significant or extremely significant level (P < 0.01, P < 0.05). A suitable concentration of flavone extract could significantly promote the root absorption on N, K, Ca, Mg, Fe, Mn, Cu and Zn, but in view of four kinds of crop, the different concentration has different promotive or inhibitive effect. Research results showed that the appropriate concentration of flavone extract from C.cathayensis exocarp could promote the growth of four kinds of crop seedlings, and improve the effect of the mineral nutrient absorption of seedling newborn roots.
An Environmentally Friendly Technology for Biomass Production Hydorchar from Renewable Resources
Authors: Lei Yan Qiu , Su Hai Quan
Published: August 2013

A green and sustainable route for preparation of hydrochars from cornstalk by hydrothermal carbonization (200°C) was described. The morphology of the hydrochars changed with reaction time increased, the surface of the materials contained a large number of functional groups, showed higher adsorption capacity for Cr (VI) than activated carbon and the removal rates of Cr (VI) were 67% and 29% respectively (pH=1, 20°C).
Efficient Sunlight Active Nanocomposite Photocatalyst for Degradation of Pollutant Organic Dyes
Authors: Duan Li Mei , Liu Jing Hai , Pang Qing Yu , Xu Ling , Liu Zong Rui
Published: August 2013

The sunlight activated photocatalysts are urgently needed for the applications of photocatalytic techniques to environmental pollutants removal. Herein, we report the one-step hydrothermally prepared CdS/TiO2 nanocomposite photocatalyst that is active in the degradation of pollutant organic dyes under solar light. The morphology and components are confirmed by TEM, SEM and XRD. With methylene blue (MB) as the model pollutant organic dye, the photocatalytic activity of CdS/TiO2 nanocomposite photocatalyst under sunlight is demonstrated, and 80% MB is removed after 120 minutes sunlight illumination. Besides, the influences of pH, the amount of photocatalyst and the addition of H2O2 on photocatalytic activity for the degradation of MB are also investigated to mimic water treatment process.
In Situ Hydrogenation and Desulfurization of CS2 by Mg-Based Hydrogen Storage Material:Products and Mechanism Analysis
Authors: Zhang Tong Huan , Yang Min Jian , Li Peng Bo , Ran Wei Xian , Zhang Qian Qian , Li Chang Zhen , Ding Chao
Published: August 2013

Mg-based hydrogen storage material was prepared by ball milling, and then the material was used to react with CS2. The morphology and hydrogen desorption properties of the hydrogen storage material as well as the CS2hydrogenation product were analyzed. Results show that in situ hydrogenation and desulfurization of CS2happens with the MgH2in the hydrogen storage material as hydrogen donator and desulfurizer at 300 °C and ordinary pressure, and MgS, CH4and H2S are generated from the reaction. There is a coupling relationship between dehydrogenation of the hydrogen storage material and hydrogenation of CS2. The addition of nickel and molybdenum show negative effect on the sulfur fixation capability of the Mg-based hydrogen storage material though they could decrease the dehydrogenation temperature of the material.
Poly(Vinylpyrrolidone)-Anchored Iridium Nanoparticles Supported on Al2O3 as Ultra-Selective Catalyst for the Hydrogenation of p-Chloronitrobenzene
Authors: Fan Guang Yin
Published: August 2013

Poly (vinylpyrrolidone)-anchored iridium nanoparticles (PVP-Ir) were prepared via the reduction of H2IrCl6·nH2O in ethanol/water mixtures. The catalytic properties of the colloidal nanoparticles that dispersed on Al2O3(PVP-Ir/Al2O3) were investigated in the selective hydrogenation ofp-chloronitrobenzene (p-CNB) top-chloroaniline (p-CAN). The results indicated that the selectivity top-CAN remained on the level of 100 % at complete conversion ofp-CNB at lower temperature of 288 K. Moreover, the side reaction of hydrogenolysis of the carbon-halogen bond was completely inhibited in the absence of promoters and inhibitors. The great improvement on activity and selectivity of PVP-Ir/Al2O3was attributed to the highly and homogeneously dispersion of the iridium nanoparticles on the support Al2O3and the addition of appropriate amount of water in organic solvents
Removal of Fluoride from Drinking Water by Gel Composite of Metal Ion and Humic Acid Adsorbent
Authors: Hong Li , Wang Si Xiang , Liu Yong , Zhang Yue Chun
Published: August 2013

Humic acid adsorbent modified with metal ions was prepared by gel polymerization and named gel composite of metal ion and humic acid, which abbreviated GCMH to uptake fluoride from drinking water. The samples were measured by X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images. Fluoride adsorption onto the synthesized samples was investigated by batch adsorption method. In previous works, detailed studies were carried out to investigate the effect of contact time, adsorbent dose, initial solution pH, temperatures and co-existing anions. The maximum fluoride removal was obtained at pH7. Presence of HCO3− adversely affected the adsorption of fluoride. The optimum absorption conditions were at the dose of 10g/L, temperature of water of 55°Cand contact time of 6hs.
The Performance of Au Nanoparticle Supported on Mesoporous TiO2 for Low-Temperature CO Oxidation
Authors: Li Jian Hua , Feng Meng Jie , Jia Mei Lin
Published: August 2013

A series of mesoporous TiO2 supports were synthesized by the sol-gel template method by using different surfactant and Au/TiO2 catalysts were prepared by the solution reduction method. The catalytic oxidation of CO was taken as the probe reaction for comparing the catalyst activity. Wide-angle XRD patterns and N2 adsorption–desorption isotherms revealed that the TiO2 with crystallized anatase and mesoporous structure can be synthesized after an optimized sol-gel template method. The results indicated that the pore size of TiO2 plays a key role in the catalyst activity. Among them the activity of Au/TiO2-F1 catalyst synthesized by using the F127 surfactant demonstrated superior activity to other catalysts. CO could be converted at 70 °C.
Study and Application of Cold-Forming Binder for Coke Powder
Authors: Yang Mei Ling , Zhang Song , Ma Li Ping , La You Zhua
Published: August 2013

Industrial molasses, along with strengthening agent, which can be served as the raw material to produce coke powder, , Investigation of cold and hot strength and compressive capacity of formed coke showed that dosing 10% of industrial molasses and 1% of strengthening agent can meet the binder production requirements. The formed coke can be the alternatives of coke nut for electric furnace smelting. The raw material of this binder is cheap and abundant in market; its production is simple, cheap and clean.
Determination of Trace PCB in Water by GC-MS with Ionic Liquid Based Headspace Single-Drop Microextraction under Ultrasound
Authors: He Shi Wei , Shen Chen Yi , Wei Xiao Qin , Jin Mi Cong , Cai Mei Qiang
Published: August 2013

An accurate and sensitive method has been developed for the determination of PCBs in water by gas chromatography coupled with mass spectrometry (GC/MS) with ionic liquid based headspace single-drop microextraction under ultrasound. The sample injection part of gas chromatographic instrument was modifed to avoid the ionic liquid leaking, selected 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MI[PF6]) as extracting agents. Experimental parameters influencing the extraction performance, such as desorption temperature, ultrasound extraction time, extraction temperature, ionic liquid headspace volume and salt effect, were optimized. Calibration curve was linear within the range of 10~300.0 μg/L, and the extraction recoveries with RSD values lower than 9.1% were from 77.6% to 103.3%. The limits of detections (LOD), calculated on the basis of signal-to-noise ratio of 3 (S/N=3), was in the range of 0.005~0.007 μg/L. This method is found to be simple, sensitive, little interferential and good specificity for the determination of trace PCBs in water. Real sea sample was successfully analyzed using this method.
Distribution, Sources Analysis and Eco-Toxicological Risk Assessment of Polycyclic Aromatic Hydrocarbons (PAHs) in Surface Soils in the Northern Yellow River Delta, China
Authors: Yuan Hong Ming , Li Tie Gang , Ding Xi Gui , Zhao Guang Ming , Ye Si Yuan
Published: August 2013

Recent occurrence and distribution of 16 priority polycyclic aromatic hydrocarbons (PAHs) proposed by USEPA in the northern Yellow River Delta (YRD) were studied based on the analytical data of 20 surface soil samples. The concentrations of 16 PAHs varied from 27.5 to 129 ng g-1 (dry weight). A clear tendency was observed that the total concentration of 16 PAHs is getting lower from west to the east in this area. The eco-toxicological risk assessment showed that this area is at low ecological risk region, which might not exert significant potential damage to the organisms. Four to six ring PAHs were predominantly from the coal and wood combustions in the whole area.
Diurnal Variations and Personal Exposures of Carbonyl Compounds in Different Types of Malls in Nanchang
Authors: Li Jian , Yan Liu Shui , Xie Chun Juan , Li Ling Na
Published: August 2013

Diurnal variations and personal exposure of carbonyl compounds were investigated in four types of large shopping malls (including department store, supermarket, bookstore and furniture store) in urban district of Nanchang, China. The diurnal measurements both in the summer and winter showed that the concentrations of carbonyls exhibited a higher peak at the morning hour and a lower peak at the evening hour except for acetaldehyde, which obviously peaked at the afternoon hour in winter. The indoor concentrations of LMW carbonyl compounds were found higher than their outdoor counterparts with only a few exceptions. For some high molecular weight (HMW) carbonyls (C5) especially for benzaldehyde and p-Tolualdehyde which might have stronger outdoor source (e.g. vehicle exhaust), resulting in the Indoor/Outdoor ratios below 1. The personal exposures showed that large shopping malls in Nanchang were important microenvironment for exposure to formaldehyde and acetaldehyde.
Experimental Research of Liquid Hydrocarbon Volatilization and Vapor Cloud Diffusion Concentration
Authors: Wang Kai Quan , Wang Xue You , Shu Xiao Yong , Gu Tao
Published: August 2013

The main components of liquid hydrocarbon leakage evaporated gas is methane, which is not only a meanly greenhouse gas, and also a kind of dangerous substances may cause fire and explosion. Study of the mechanism of the liquid hydrocarbon leakage and evaporation will be beneficial to protect environment, prevent fire and explosion accident effectively. Based on the homemade experimental platform of liquid hydrocarbons volatilizes and diffusion, the speed of diesel oil volatile in the cup was detected with the temperature of 30°C, 60°C, 90°C and 120°C respectively, and the concentrations distribution variation of vapor cloud above the liquid level of 0.4 m, 0.8 m, 1.2 m and 1.6 m was also detected in a sealed condition. The results indicate that: diesel oil volatilization has exponent relation to diesel oil temperature; the vapor cloud density has logarithmic relation to diesel oil volatilization:; and the time of forming the explosion concentration of vapor cloud has exponent relation to diesel oil temperature:. There is a peak area of concentration at about above the liquid level of 0.8m, and achieve explosion concentration in where firstly and then expanding on both ends. This paper provided a liquid pool volatilize diffusion experiment platform which can quantitatively study the volatile speed of diesel after leakage, quantitative analysis can be vapor cloud explosion concentration distribution, and the experimental results can be used to guidance for early-warning and control the explosion disaster of liquid hydrocarbon and reduce the methane to the air pollution.
Mixture Effects of Five Different Types of Organic Pollutants on Photobacterium Q67
Authors: Ge Hui Lin , Liu Shu Shen , Su Bing Xia , Li Jian Guo , Yin Gui Hao , Mo Ling Yun
Published: August 2013

The low-dose and combined effects of aniline, nitrobenzene, phenol, dimethyl phthalate, and dichlorvos on photobacteriumVibrio qinghaiensiswere predicted and evaluated by using concentration addition and independent action models. The mixtures effects were greater than single components effects, which implied that combined effect of environmental pollutants should be considered in risk assessment practice.
Differential Root Morphology between Metallicolous and Non-Metallicolous Populations of Rumex japonicus under Copper Stress
Authors: Huang Wu Xing , Ren Cong , Gao Jing Qing
Published: August 2013

Two Rumex japonicus populations, one from copper (Cu) mine and the other from uncontaminated site, were studied for root morphology and biomass under Cu stress. Main root length and number of tips of the two populations were both significantly inhibited by Cu treatments. However, those of metallicolous population (MP) were higher than non-metallicolous population (NMP) under Cu stress. Cu treatments significantly inhibited root surface area in NMP while MP showed little difference from control. Cu treatments inhibited average root diameter and root/shoot ratio in NMP, but those in MP were significantly higher than control. Cu treatments significantly inhibited shoot biomass and root biomass in NMP. These results suggested that more assimilates allocated to root and the average root diameter increased under Cu stress to form a greater and stronger root might be partly reasons why R. japonicus can colonize the Cu enriched soils.
Gray Relevancy Analysis on Blasters' Unsafe Act in Chinese Coal Mine
Authors: Yang Wen Wang , Gao Shang Fei , Yang Chun , Zhu Kai , Dong Ji Ye , Chen Ze
Published: August 2013

In order to find exactly which unsafe act would cause gas explosions easily, some traditional statistics of the blasters' unsafe act which recorded during 1999 to 2008 were reviewed. The gray relevancy analysis method was used to analyze the blaster's unsafe act. The gray relevancy degree of blaster's unsafe act was got. Results show that the four kinds of act ('blasting with fire or coal mine electric power', do not cover the connection of bus properly', 'hole sealing without water stemming', 'do not have enough stemming') have a closer relationship with gas explosions.
Management Mechanism and Policy Implications: Research on the Disaster Management in the Process of Modernization
Authors: Tan Xian Chu
Published: August 2013

With the deepening of scientific and technological progress and globalization, the social management of disaster and its research has been becoming a global hot spots based on the objective background of risk society. The paper not discusses, Which is combined with practical experience and research literature of China's disaster management, the practical appeal and purposes of disaster management but initially reveals its mechanism is "the mode of regularity, which is formed in the process of change and development of the social disaster management" based on the definition of disaster management. At the same time, the paper also points out the basic operation framework of the management of disaster is "the warning and preparedness before the disaster, the controling and handling in disaster, post-disaster assessment and reconstruction", and thus put forwards the corresponding policy recommendations.
Study on Emergency Management Information System of Sudden Ecological Crisis
Authors: Wu Zhi Dan
Published: August 2013

Firstly, this paper analyzes the features and development stages of sudden ecological crisis, and divides the process of emergency management into three stages. Then the paper puts forward a new kind of emergency management information system model which is based on data mining and WebGIS Technology. Finally, the paper studies the structure, function modules and operation flow of the system. This study is significant in improving the scientific and effective emergency management. It provides a useful reference for further system development.
The Correlation of Sediments Characteristics with Organochlorine Pesticides (OCPs) in Surface Sediments of Nansi Lake, China
Authors: Zhang Gui Zhai , Pan Zhao Ke , Li Jing , Li Xiao Ming
Published: August 2013

The correlations of sediment characters[total organic content (TOC), particle size, soluble salt] with organochlorine pesticides (OCPs) in seven surface sediment samples of Nansi lake were discussed. Organochlorine pesticides(OCPs) in seven surface sediment samples of Nansi lake were analyzed by GC／ECD(Gas chromatography with electrochemical detection). The result showed that OCPs content was 2.9-6.91ng/g dw (dry weight).The concentrations of organochlorine pesticides (OCPs) failed to correlate with sediment characteristics (TOC, particle size and soluble salt).
Optimizing the Coupling of a Firebrand Generator to a Horizontal Wind Tunnel
Authors: Hashempour Javad , Sharifian Ahmad
Published: August 2013

Australia is considered as the most fire-prone country in the world. Spotting ignition by lofted firebrands is the main mechanism of fire spread. Many experimental studies have been conducted to evaluate the effect of the firebrand attacks on structures and to identify possible solutions. The experimental facility consists of a firebrand generator coupled to a wind tunnel. The wind speed in the firebrand generator is relatively low, in order to assure a quality continuous flow of glowing firebrands. On the contrary, the wind speed in the wind tunnel is high to duplicate actual firebrand attacks. Previous works show a highly turbulent region above the entrance of firebrands to the wind tunnel which is formed because of the velocity difference and penetration of firebrand entrance hose into the wind tunnel. The penetration is required to provide a uniform firebrand distribution along the height of the test section. In this computational work, the influence of the height of the entrance hose, its orientation respect to the tunnel and the distance between the coupling port and the test section are analyzed. The optimized results are presented and discussed for a variety of wind speeds within the wind tunnel and the firebrand generator.
Co-Benefit Research on IGCC Technology Used in the Power Plant
Authors: Huang Chao , Ma Xiu Qin , Jin Feng Yun , Su Liu Wen
Published: August 2013

China has mainly power generation capacity of coal-fired power plants. Coal-fired power plants account for about 80% of total power generation capacity in total annually. It will inevitably lead to a large amount of pollutant emissions, therefore, IGCC technology is particularly important to promote. This paper intends to analysize the environmental benefit and economic benefit of the IGCC technology used in the power plant based on the developed methodology. The purpose is to understand the advantages of IGCC technology for energy conservation and emissions reduction in the electric power industry to provide better technical references.
Heuristic Topology Analysis of the Shipboard Power Systems Based on Petri Net Modify
Authors: Hou Xin Guo , Wang Jia Lin , Du Guo Bin , Bu Le Ping
Published: August 2013

According to the characteristic of the shipboard power system, heuristic search for fast tracking shipboard power system network topology is introduced. Using for reference of the methods of fault diagnosis of the power systems, the Petri net technology is used to fault location and removal of uncertain and fault signals, which can modify the topology analysis results. Setting the topology analysis and remodel based on Petri net of the typical shipboard power system for example, the results is validated.
Distribution Network Reactive Power Planning Based on Improved Evolutionary Strategy Theory
Authors: Sheng Si Qing , Li Xing , Lu Yang
Published: August 2013

In this paper a distribution network reactive power planning mathematical model was established, taking the minimized sum of electrical energy loss at the different load operation modes and the investment for reactive power compensation equipments as objective function to solve the planning question respectively and taking the transformer tap as equality constraint. The evolution strategy is improved, The Euclidean distance is introduced into the formation of the initial population, and the initial population under the max load operation mode is based on the optimal solution of the min load condition. The Cauchy mutation and variation coefficient are introduced into the evolution strategy method. By means of improvement of fitness to ensure diversity of population in early and accuracy of the fitness value.
Structural Optimization and Electric Field Analysis on the Insulation Structure of UHDV Wall Bushing
Authors: Li Yu Mei , Ding Tao , Chen Zong Tao
Published: August 2013

The insulation mechanism of UHVDC wall bushing is discussed. Design solution of the insulation structure is determined. In the solution, internal insulation includes SF6 gas-insulated and shielding structure, and external insulation is a type of composite insulating material, which is made up of epoxy FRP pipe and silicone rubber sheds. Creepage distance of external insulation and two types of shielding structures are designed in the paper. Finally two types of shielding structure are compared and optimized based on electric field simulation, and the result shows that dual-plate grounded shielding can enable the electric field strength of UHVDC wall bushing more evenly distributed.
Research on Mechanical-Electric Brake Simulation in Electric Drive Tracked Vehicle Based on Virtual Prototyping
Authors: Zhang Shu Yang , Lin Yan , Tian Peng , Yan Nan Ming , Shang Ying Hui
Published: August 2013

In order to analyze the process of mechanical-electric brake of electric drive tracked vehicles accurately, a dynamic/kinematic model which based on multi-body dynamics software RecurDyn, and a control system model based on Matlab/Simulink were established. Both of the two models are co-simulated through the software interface technology. The brake process of the drive motor that based on vector control technology is analyzed.
Emergency Control Strategy Study on Multi-Send HVDC Project from Central China to East China Power Grid
Authors: Zhang Jia , Song Xiao Fang , Xue Feng
Published: August 2013

In the summer peak load operation mode of the interconnected power grid which is integrated with HVDC transmission lines from Central China power grid to East China power grid, security and stability emergency control strategies based on generator shedding and EDCPS (Emergency DC Power Support) are studied to cope with system instability caused by Tuanlin-Fengjing DC line unipolar block fault. Simulation results show that interconnected system cannot maintain the transient stability effectively by using EDCPS only. A coordinated control strategy which combines generator shedding with EDCPS is proposed to reduce the number of generators to be shed and ensure the transient stability. Through optimizing EDCPS which two or more HVDC lines participate in, an optimal coordinated control strategy is proposed. Simulation results present that the strategy which combines GC shedding with Longzheng DC bipolar supporting is the optimal strategy.
DC-Bus Voltage Control Strategy Based on Low-Pass Filter for Three-Phase Four-Wire APF
Authors: Feng Xia , Zhong Xiao Jian , Xu Qun Wei , Chen Guo Zhu
Published: August 2013

The DC-bus voltage control is critical for stable operation of the three-phase four-wire Active Power Filter. DC-bus stable voltage loop and balance voltage loop are established based on the small signal model. Considering the disadvantages of the traditional PI control, second-order low-pass filter is introduced into the proposed controller. Simulation and experimental results are conducted to validate the effectiveness of the proposed strategy.
Research on the Half-Bridge Three-Level DC/DC Converter with High Frequency and High Voltage
Authors: Zhang Hong , Wang Gui Xin , Yan Hao , Zhang Lu Zhou
Published: August 2013

In this research, a high-voltage direct current zero voltage switching (ZVS) PWM half-bridge converter is proposed. The parameters of the converter as follows: the input voltage is up to 4000V;the output voltage is 600V.The new ZVS PWM TL converter has neutral point clamping diodes and flying capacitor. This research is going to analyze the working principle of circuit witch thus realizing the zero voltage switching and the circuit parameters selection. Moreover, circuits simulation is carried out by MATLAB to verify the reliability and feasibility of this DC/DC converter topology.
The Coupling of Electrostatic Discharge to Electronic Equipment
Authors: Liang Zhen Guang , Yang Ming Yuan
Published: August 2013

Electrostatic Discharge (ESD) is a serious threat to electronic equipment. It can couple into equipment and disturb or even damage internal circuit. In the paper, the coupling of ESD to electronic equipment is presented. It includes the coupling of ESD to EUT and that to PCB. In the coupling of ESD to EUT, there gives five conduction interferences and shows that it’s important to obstruct ESD current and lead its route bypassing sensitive circuit. There also presents the coupling of ESD radiated field to EUT and PCB. It shows unintentional antenna structures and parasitic parameter circuits play important role in ESD interference. They need to be removed and restrained.
A Improved LVRT Control Strategy Based on Active and Reactive Power for Direct-Drive PMSG Wind Generation System
Authors: Yang Guo Liang , Liu Shuo Yang , Chang Xin Yan , Zhang En Bei
Published: August 2013

The structure of the uncontrolled rectifier + Boost circuit + PWM inverter is taken for direct-drive permanent magnet synchronous generator (PMSG) wind-power system. on the basis of the analysis for two different traditional control strategies for the grid side converter, a new control strategy Based on active and reactive power for the low voltage ride through running is proposed and described in detail. The simulation results verify that the given control strategy can be better to provide a reliable guarantee for the system low voltage ride through capability and to provide some reference for the actual control system design.
Analysis of Direct Cooling High Temperature SMES Device Leakage Magnetic Field Based on Finite Element Method
Authors: Li Xiang , Wu Gang , Zhou Gang , Bi Ke , Tang Zhi Yin , Zhang Qing Zhi , Ma Ji
Published: August 2013

High temperature superconducting magnetic energy storage system (SMES) is a strong electromagnetic source with serious leakage magnetic field. Leakage magnetic field can cause certain effect to environment, which should be taken into consideration in the design process of high temperature SMES. Direct cooling high temperature SMES device was seen as research object. Two dimensional model of high temperature SMES device was built by using ANSYS, and the leakage magnetic field of SMES devices, whose cryostat are of different magnetic permeability, were compared. The security scope of SMES device was determined under operating condition. Research results can provide important guidelines for the design of the SMES device.
Implementation of a High Reliability IGBT Power Device
Authors: Chen Shen Li , Hsueh Yi Tsai
Published: August 2013

The insulating-gate bipolar transistor, IGBT, is a power component which is developed in the medium power and medium frequency. It inherently integrates the structures of a power bipolar transistor and a power MOSFET, and then it has better performance in many applications. Advantages of this device are the high current density, the outstanding breakdown voltage, as well as the excellent operating frequency and so on. And, it might make up the shortcoming of MOSFETs or BJTs utilized separately. In this paper, a smart IGBT device is developed by using the semiconductor process and device simulation tools. Therefore, a relationship between the depth of drift region, doping concentration, and breakdown voltage in an IGBT will be investigated in this work. Eventually, this device will be with the 200V breakdown voltage and 20A on-state driving current capability. Meanwhile, the ESD and latch-up (LU) protection structures will be accomplished in this study.
Study on SVG Simulation with the Voltage and Current Dual Closed-Loop PWM Control Strategy
Authors: Shi Xin Chun , Zhang Wei , Liu Pei Ran
Published: August 2013

This paper first introduced the SVG main circuit and the basic principles of SVG, then finished SVG modeling in dq coordinate process. Then an SVG direct current control method was proposed as well. Considering stability requirement to the DC side voltage, the paper designed voltage and current dual closed-loop PWM control system. Finally, SVG system was simulated using the Matlab/simulink. Results show that SVG has a good dynamic performance, verifying the correctness and validity of the dual closed-loop control.
Distributed Optimization and Control of Microgrid Considering Environmental Protection and Stability
Authors: Hao Yu Chen , Dou Xiao Bo , Wu Zai Jun , Hu Min Qiang , Li Tao , Zhao Bo
Published: August 2013

In order to reduce pollutant emissions to improve environmental protection, and maintain microgrid stability during real-time operation, a distributed energy optimization scheduling and stability control strategy was proposed. According to the distributed nature of the microgrid, as well as operational objectives of different microsources, an optimal scheduling model for microgrid environmental protection was designed. Based on the proposed model, the tasks of each unit in optimal scheduling and stability control were described. Genetic algorithm (GA) and user datagram protocol (UDP) were used to implement distributed optimization and control of the microgrid. The simulation indicates that, compared with the traditional centralized optimization and control, the proposed distributed optimization and control strategy can clearly show the characteristics of each unit, and have a faster computation speed. Meanwhile, it can timely response once the voltage fluctuates due to power imbalance, so as to keep microgrid stability in real-time operation.
Distribution Network Fault Reconfiguration with Distributed Generation Based on Ant Colony Algorithm
Authors: Wang Qian , Meng Lu
Published: August 2013

With the development of Smart Grid, the permeability of distributed generation (DG) is increased gradually. When a fault happens in systems branch, DG plays a significant role in ensuring a continuous supply to the load points as many as possible. This paper uses ant colony algorithm to achieve distribution network fault reconstruction with distributed generation, in order to guarantee the load points to restore power as many as possible, and the network system having the minimum loss at the same time. The optimization process is divided into two parts: first, In case of DG power supply capacity known, we optimize the capacity of the Island formed on DG, in order to determine the nodes of the island. Then, we optimize the isolated system and the main distribution system separately, in order to find the system radiation structure of minimum network loss. Finally, the IEEE 33 nodes distribution network is used as an example to testify the effectiveness of ant colony algorithm.
Research and Application of GPR in Detection of Heating Pipelines on Complex Highway
Authors: Sun Shi Guo , Wang Jia , Miao Ai Wei , Liu Wen Bo
Published: August 2013

Based on test principle of ground penetrating radar (GPR), the application feasibility for detecting the heating pipelines on complex highway is verified. In accordance with the complex highway in Wangjing region of Beijing city in China, by using ground penetrating radar of SIR-20 to monitor the geological situation of construction surface, the plain position of pipeline and the buried depth, the detection shows that: the objects of bigger relative dielectric constant absorbs the electromagnetic wave signal from periphery; the maximum intensity of reflection radar wave appears at the top of pipeline; the arc width in radar wave image produced by the bottom of pipeline is bigger than the top. Based on these studies, the design program and accident removal countermeasures for the detection of complex highway pipeline are proposed. Meanwhile, combining with actual measurement in field, contrives scheme utilizing ground penetrating radar to detect heating pipelines. It could be verified the feasibility of testing heating pipelines with ground penetrating radar, provides a basis for the subsequent security dynamic construction design, and accumulates some experience for ground penetrating radar detecting pipeline on complex highway.