bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Coarse Aggregate Types on the Microstructure of the ITZ and Durability of Concrete
Authors: Kong Li Juan , Meng Qing Chao , Du Yuan Bo
Published: November 2013

Influence of aggregate types on the impermeability and frost-resistance of concrete with different water/cement ratios were investigated, as well as the pore structure and hydrates of the ITZ. The results show that, concrete prepared with a high water/cement ratio and using granite aggregate, presents the highest values of chloride diffusion coefficient and the lowest numbers of freeze-thaw cycles. Whereas concrete prepared with a low water/cement ratio and using limestone aggregate, obtains the similar durability results. The limestone aggregate with a rough surface and higher water absorption, has a tight bonding with the cement paste. However, the granite and basalt aggregate that formed by magma eruption, have higher activity. The XRD results demonstrate that more clinkers participate in the hydration of cement, therefore, resulting in a denser ITZ. In order to improve the concrete durability, the basalt aggregate both with higher activity and rough surface is consider optimal.
Research Review of Coal Mining on the Coal Village
Authors: Li Wen Bin , Yang Yao Qi , Yu Yang , Wang Peng Fei , Wang Hai Juan
Published: November 2013

China is a country with rich coal, coal mining plays an important role in our country's energy security. But at the same time, in support of national progress of energy industry and national economic development, coal mining has caused a lot of damage to the ecological environment and social issues. The exploitation of underground resources not only leaded to the ground the destruction of arable land, but also damaged the ground coal mining under village buildings seriously. This leaded to the farmers of the coal mining under villages lost their survival, caused the contradiction between human and land and the contradiction of the cadres and the masses, causing a group petition and a series of incidents, directly affect sustainable development of the mining area. So according to the particularity of coal mining under villages, in this paper, systematic summary and analysis research of coal mining under village on recent literature ,have very important theoretical significance and social value.
Problems and Suggestions of Coal Mining Subsided Land Governance in Jining City of Shandong Province
Authors: Huang Xian Dong , Yang Guang Hua , Yang Yao Qi , Li Wen Yu , Chen Hui Ling , Wang Hai Juan
Published: November 2013

Jining city is one of the key coal national development base.The width of land subsidence area , the depth of collapse and the difficulty of its government are all rare in the nationwide. This paper analyzed the coal mining subsided land and village relocation situation in Jining city , summarized the situation of the coal mining subsided area comprehensive governance and the coal under villages relocation and pointed out the difficulties and contradictions of these two efforts.And it also proposed that establishing a sound reduction loss mechanism of cultivated land protection, and adjusting and perfecting the land policy of coal under villages relocation are the keys to solve the above problems.
Simplified De Bore Model of Coal Adsorption Gas
Authors: Jiang Wen Ping , Zhang Qun
Published: November 2013

With respect to the problems existed in the description of the adsorption characteristics of super-low rank and super-high rank coals using the conventional Langmuir adsorption model, in this paper, We first introduces the De Bore adsorption model into the coal seam gas adsorption, and utilizes the results of the ab initio calculation of quantum chemistry result and the isothermal adsorption test statistical results, simplifies the De Bore model equation. The new adsorption model is more suitable for describing the gas adsorption characteristics of the whole coal ranks. This new model has the stronger function and wider suitable scope than the Langmuir adsorption model.
Numerical Modeling of the Influence Scope of Marine Oil Spill with Wind-Driven
Authors: Li Ming Chang , Zhang Guang Yu , Si Qi , Liang Shu Xiu , Sun Zhao Chen
Published: November 2013

In this paper, a multi-module coupled oil spill model is applied for simulating the influence scope of oil with the hydrodynamic current field data and wind field data. A case study is researched in this paper. The model works well and the numerical simulation results show the model is suitable for oil spill influence scope simulation.
Control Technology and Application for Surrounding Rock Deformation in T-Junction Area of Gob-Side Entry Retaining
Authors: Han Chang Liang , Zhang Nong , Li Bao Yu
Published: November 2013

On the bases of theoretic analysis, numerical simulation, and project practice, stress distribution of surrounding rock and movement characteristics of roof strata in T-junction area of gob-side entry were analyzed. Besides, control technology in T-junction area was proposed after indicating deformation characteristics of different stages in gob-side entry. Results show that there is an inclined block in T-junction area after fracture of main roof and the period when the block is tending to stability is a critical stage of pressure appearance for gob-side entry. Further, three stress zones: in-situ stress zone, abutment pressure zone and low stress zone appear in both strike and dip of mining panel and enhanced support of gob-side entry before excavation should keep away from the abutment pressure zone, which also indicates that deep bolting support can exert the bearing capacity of deep rock mass. Additionally, the whole procedure of surrounding rock deformation can be divided into four stages and deformation in gob-side entry is larger than that of entry excavation, which means that efficient support design should be taken into account. Ultimately, district control technologies for surrounding rock of gob-side entry in back zone, filling zone, and front zone are proposed and it showed a good adaption in project practice of coalmine.
Experimental Study on the Impact of Jet Penetration with Different Spacing Interval
Authors: Gao Hong Chao , Luo Xing Bai , Zhang Yong
Published: November 2013

Using the experimental method with different spacing interval determined the degree of the target to the jet penetration ability. In order to verify the effect of interval size on the jet penetration, sunder armor ammunition simulation experiment was carried out, using a 40-mm sunder armor ammunition penetrated designed target plate. Through the study of residual penetration data, verify and sort out the regulations of the jet penetration. The experimental results show that the interval of the target of jet penetration has more adverse effect, at the same time also can reduce the diameter of the jet hole, the jet attenuation effect is obvious.
Simulation of Microwave Activation Effect of Coal Gangue by ANSYS
Authors: Zhang Xiao Mei , Zhao Zhi Man , Wang Chun Jie
Published: November 2013

Microwave activated coal gangue is a complex process, which is bound up with irradiation time, fineness, composition and other factors.Coal gangue is not easily absorbed substances,so it could be get microwave energy for activation from strong wave absorbing materials. In this paper,as influence of the activation process of coal gangue by microwave irradiation time, establish the computer simulation model by ANSYS.As a reference to modify the activation process,improve and perfect the model of microwave activated coal gangue.
Study on the Form of Mercury in Chinese Coal
Authors: Wu Guo Fang , Liu Qing Cai , Lan Yuan Pei , Yang Jian , Gao Wei
Published: November 2013

Study on the forms of mercury is helpful to remove Hg from coal or flue gas more effectively. This paper focus on the coal from three main production base of China, and the Hg content in coal samples was measured by Zeeman effect-mercury analyzer (Lumex RA-915+and RP-91). Moreover, the chemical composition and main phase in coal sample were studied by XRF and XRD. The research results show the Hg content has a close rotation with Si and Al in coals. With the increasing of Si and Al there is more Hg in coals, it further prove the main form of Hg in coals is intergrowth with clay.
Analysis of Operating Condition on a Solar Direct Heating
Authors: Zhang Xi Ming , Li Xue
Published: November 2013

Solar energy is a clean energy, nowadays promoting environmental protection and energy conservation. Solar technology has been rapid development. Research group develop solar heat pump heating system. Solar heating was carried out in direct operation conditions. During the test, the average amount of solar radiation during the day is 47.7kWh and the average of the heat collection is 22.41kWh. Power consumption of system changes between 8.46kWh and 8.52kWh and the mean is 8.49kWh. The average of system efficiency is 0.35. During the test, room temperature meets the requirements.
Thermal Treatment of the Mineral Wool Mat
Authors: Zhukov Alexey Dmitrievich , Smirnova Tatyana Viktorovna , Zelenshchikov Dmitry Borisovich , Khimich Anastasiya Olegovna
Published: November 2013

The operational stability of mineral wool materials is largely determined by the uniformity of polycondensation the binder in the material volume. For optimization the thermal treatment parameters software system was designed, and its been tested in technology of layered products.
A Web GIS Application of Desertification Status of Ruoergai Area
Authors: Yu Xin Wen , Liu Gai Ping , Liu Hong Yu , Yin Zhong Dong
Published: November 2013

This paper described a web GIS application of desertification status of Ruoergai area based on Google Maps. Desertification data were categorized as types, degrees, area of land desertification. Each category was classified/defined based on former research. The system was implemented based on detailed design by employing technologies such as Google Map API, data cache and struts2, etc. Application of the system proved to be applicable for demonstration of desertification status of Ruoergai area.
Movement and Erosion Quantification of Large Landslide through Terrestrial Laser Scanning
Authors: Hu Man , Xie Mo Wen , Xu Bo , Wang Li Wei
Published: November 2013

The deformation monitoring of the landslide is an important research in the field of slope engineering. The terrestrial laser scanner is frequently applied to the deformation monitoring for landslide risk reduction in recent years. In this paper, the deformation was detected by means of comparison of sequential scanning datasets. And the erosion quantification can be extracted from the deformation. Finally, a preliminary change analysis methodology to distinguish landslide movement from erosion is presented. Our results enable us evaluate the stability of the landslide generally and basically. The application of terrestrial laser scanning to detect the movement and erosion quantification provides us another considerably effective and efficient way in the high-risk landslide deformation monitoring.
Structural Damage Monitoring Using the Eigenvector Perturbation Method
Authors: Li Na , Yang Qiu Wei , Liang Chao Feng
Published: November 2013

This paper presents an improved method to detect structural damages only by changes of eigenvectors. The underlying principle of the proposed technique is to measure the eigenvectors of the damaged system, and then use this set of data as well as the original test data of undamaged system to identify structural damages with the help of eigenvector perturbation method. In this contribution, a simple accelerated formula is developed to improve the accuracy of the eigenvector perturbation method. With the introduction of the accelerated formula, the proposed method is able to achieve more accurate results than that obtained by the original eigenvector perturbation method without any high-order analysis or multi-iterations. The effectiveness of the proposed method is illustrated using simulated data on a numerical example. From the numerical results, it can be concluded that the proposed approach is simple to implement and can identify structural damages very accurately only by the first order sensitivity analysis of the eigenvector.
The Measure Technology of the Structure Stress during the Weighing Process of the Large Structure
Authors: Li Shu Min
Published: November 2013

The structure needs to be lifted-off from the ground during the weighing progress. For that the weighing fulcrum and the building fulcrum are different and the building fulcrum is fewer usually and the weighing system has some asynchronism during the lifting process of the structure, it is very important to measure the stress of the key points of the structure during the weighing progress. The paper uses finite element analysis to get the stress sensitive of the weighing device while weighing and uses the optical fiber sensor technology to measure the dynamic stress. Through the experiment with the weighing test bench show that the optical fiber sensor technology has a clear advantage to the traditional resistance strain gauge technique.
Intersection Fuzzy Control Modeling and Simulation: The Case of Beijing
Authors: Sun Zhi Yuan , Lu Hua Pu , Bai Tong Zhou
Published: November 2013

In recent years, as the traffic congestion has been increasing serious in Beijing, many advanced transportation science and technologies have been proposed to solve the traffic problems. Intelligent control of intersection has been one of the major elements globally in the research on road traffic congestion. Based on the experience of engineering practice, this paper does research of intersection fuzzy control modeling and the fuzzy control optimization modeling based on neural network. Then, it puts forward the method of intersection fuzzy control design based on state automaton technology. Based on Matlab/VAP, it presents the method of intersection fuzzy control simulation modeling. Finally, making an actual intersection for an example, it compares the effect of timing control, induction control, fuzzy control, and neural network fuzzy control.
Characteristics of Transport Demand in Dense Urban Group
Authors: Wu Shi Mei , Pei Yu Long , Cheng Guo Zhu
Published: November 2013

Dense urban group is the inevitable product of relative developed stage of economic and social development. In order to ensure the sustainable development of dense urban group and provide a basis for formulating the transportation infrastructure of scientific development planning, this paper analyzed the traffic demand characteristics in dense urban group. The paper makes use of the statistic analysis method to analyze traffic demand characteristics, especially travel intensity, travel modaltrip time consume and trip distance. It can be concluded that trip number per person and traffic connection of dense urban group are far higher than other regions and the highway is main travel modal. However its average trip distance is low in the nationwide scope.
Study on Main Issues of Sustainable Urban Public Transport in China
Authors: Yang Li Gai , Wu Hong Yang , Chen Xu Mei , Zhang Hao Zhi
Published: November 2013

Urban public transport is the basic and guiding industry for the cities development. And it is also important livelihood projects. In this paper, the main problems of urban public transport development are analyzed, and the strategic measures are proposed for the problems to promote the sustainable development of public transport. This paper aims to provide decision-making reference for urban management department.
Study on Parameters Calibration in Traffic Simulation Technology
Authors: Liu Yan Xi
Published: November 2013

Traffic simulation technology is used to simulate traffic situation, and provide data base for selection and comparison of different proposals, whose most important problem to be solved is that simulation data can match with the actual situation. To ensure the realistic of the simulation data, we use the method which is the organic combination between GA and SPSA to calibrate the simulation model. At last, it seems that the technology is applicable from the result.
Signal Timing for Four-Phase Intersections Based on Efficiency Optimization
Authors: Shen Jia Jun
Published: November 2013

To utilize time-space resource of intersections efficiently, signal timing based on efficiency optimization was studied. The number of vehicles and speed were selected as two parameters constructing efficiency model for four-phase intersections, the relation model between these two parameters was developed basing on field data. The volume corresponding to optimal efficiency through derivation and signal timing on the basis of this volume were obtained by applying Synchro software. Conclusion through an actual case indicates that this method can achieve minimum delay on the premise of efficiency optimization and make the performance of signalized intersection better.
The Formation and Prevention of Debris Flow in Qiupi of Ji'an City
Authors: Li Ming , Zhang Tian Yu
Published: November 2013

The geological conditions are unstable in Ji'an City of Jilin Province, and there is the probability of various geological disasters. In this paper, the debris flow in Qiupi of Jian City is studied in detail, which is still hazardous to the local residents. According to the geological conditions and the debris flow probability, the debris flow formation and control measures are comprehensively investigated in order to reduce the landslide harm to the local residents.
Water Inrush Risk Evaluation of Seam Roof and Floor at Mayingbao Coal Field in Shuozhou City, Shanxi Province
Authors: Li Pei Tao , Jia Xiu , Zeng Yi Fan
Published: November 2013

Hydrological exploration tests are designed and field data are acquired. By combination of theories and experiments, hydro geological condition and water filling factors of Mayingbao coal mine field are analyzed systematically aiming to ascertaining threatening degree of water hazard of the mine field and studying theory of mine water hazard prevention and control. According to coupling theory between GIS and AHP, models of “water abundance index” and “vulnerability index” are founded respectively. By methods of “three maps-double predictions” and “vulnerability index”, water inrush probability from roof and floor of chief exploitable coal seams in the mine field are evaluated quantitatively. Comprehensive regionalization of roof water filling probability and evaluation regionalization of floor water inrush vulnerability of the seams are formed. Based on above study, water inflow of first mining area is predicted and suggestion of water prevention and control for safety production is put forward. Nonlinear and multivariate theory in present geoscience research is improved because of the above results and the research provides necessary basic data for the mine designing, preliminary and feasibility research and subsequent safety production.
The Use of BP Neural Network in the Landslide Prediction of Three Gorges Reservoir
Authors: Long Hai Tao , Zhang Guo Dong , Cao Jian Long
Published: November 2013

Landslide prediction was one of the important tasks in the monitoring and early warning of the Three Gorges reservoir. On the basic of the BP neural network which was combined with the algorithm model, we took the typical Baishuihe landslide in Three Gorges reservoir for example. With the use of GPS monitoring data in surface displacement and its predisposing factors which was reservoir level, rainfall and so on, we built BP neural network prediction model. The monitoring of data recent years was used in the training and validation of the network .The results show that the BP neural network prediction model prediction can be used in the prediction of landslide deformation and the accuracy is high.
Preventive Resettlement and Risk Reduction Strategy Analysis in Disaster Risk Management System
Authors: Hu Zi Jiang
Published: November 2013

Preventive resettlement is one of the effective measures to prevent geological disasters. However, there is a lack of definite theoretical system to guide how to deal with the potential disasters and risks and provide migration decision-making. The paper selects disaster risk management as the theoretical guidance and the risk assessment of the framework system as the focus to explore hazard identification and characterization, identification of exposed elements, vulnerability assessment and determination of risk levels, through which the paper gets risk cognition and obtains the basis for risk management. Besides, the paper combines with the different characteristics and factors of geological disasters to expound on the strategy of risk reduction and put forward the possible solutions to avoid and alleviate risks. Furthermore, under certain conditions, the disaster-avoiding migration strategy is adopted.
Farmland Damage and Treatment Status in Coal Mining Subsidence Area with High Phreatic Water Level
Authors: Yang Guang Hua , Yang Yao Qi , Gao Yang , Yu Yang , Lin Shan , Li Yao
Published: November 2013

It is a typical and representative problem which coal mining has been causing serious damage in the Eastern Plains of China with high phreatic water level. Based on GIS technology, we analyzed the characters of cropland and coal resources, the results showed that the area of the overlapped areas of cropland and coal resources was 1.28 × 105km2, which accounted for 38.22% of the total arable land of the study area. Based on investigation and statistics, we investigated and forecast the farmland damage and analyzed the comprehensive treatment status in the typical region, the results showed that coal mining led to farmland subsided depth and perennial water, the recovery rate of cultivated land was between 50% and 70% in the treated area and more lower in the untreated area, the trend of arable land area continued to reduce would be hard to contain, the local governments faced unprecedented pressure on cultivated land protection.
Numerical Modeling of Soil-Pipeline Interaction Mechanism Caused by Surface Subsidence due to Longwall Mining
Authors: Cheng Guo Ming , Xu Wen Jie , Chu Hong Bin
Published: November 2013

In China, Surface subsidence caused by underground coal mining has affected the safe operation of pipelines in recent years. Take the coal mine in Shanxi section of the west-east gas pipeline as case study, numerical modeling was adopted to study the interaction mechanism of the soil-pipeline caused by longwall mining, and the numerical model was calibrated with the measurement data. The results reveal that the soil-pipeline interaction undergoes an evolution process from synchronization to separation during the subsidence process. The peak stresses on the pipeline at cross-sections occur generally above the centre of the corresponding subsidence basins at different stages of face advance, and the maximum stress on the pipeline appeared at about 150m above the centre of the subsidence basin as the face advances 300m.
Harmonic Homotopy Technique to Resonance Response of a Ship Rolls Model
Authors: Guo Zhong Jin , Sun Dan , Ma Xiao Yan
Published: November 2013

The paper presents a harmonic homotopy technique to investigate the steady state resonance response of a ship rolls model. By means of polynomial homotopy continuation, all the possible solutions corresponding to the second-order superharmonic response are derived analytically, i.e. without numerical integration. The stabilities of the solutions are determined by the Floquet theory. The sharp resonance and influence of dc component of input wave excitation of ship rolls model are observed analytically and examined by numerical solutions. Furthermore, the gains of the bias, first and second harmonic terms of stable solutions are illustrated to show the importance of each harmonic component on resonance response.
Testing of Elastic Stresses and Limit Close-Bending Moments of Reducer Bends Subject to In-Plane Close-Bending Moments
Authors: Chen Sun Yi , Chen Si Hong
Published: November 2013

Elastic stresses and limit close-bending moments of reducing elbows subject to in–plane close-bending moments were validated by limit element analysis (LMA) and testing. Results of LMA show that if the end bend moment M acts on small end while the large end is fixed, the largest movement acts on neutral line near the larger end, and large circumferential stress lies on inside surface near neutral lines but deflect to intrados of large end. For the same model, if the end bend moment M acts on large end while the small end is fixed, the largest movement acts on near the small end and lies on neutral line, and larger stress acts on small end and nearby. Results of testing show that stress character in tension stress and compressive stresses are consistent with the calculation results from formula. The limit bending moment calculation results from formula of reducing elbow is conservative, but is consistent with the formula of the limit bending moment, which is controlled by small end of reducing elbow.
Masonry Homogenization Micro-Mechanics Analysis Model
Authors: Hu Di , Tuohuti Akenjiang
Published: November 2013

Micro-mechanics models of masonry basic cell were established to obtain homogenized Young's module and Poissons ratio, according to the finite element homogenization analysis (FEA) results in x, y, z. Model results demonstrate that relatively small errors (less than 6%) occur compare with exact solution.The paper concentrates on the issue of linear homogenization, therefore, it can be used as effective estimates for homogeneous material stiffness degradation of nonlinear range. Through linear superposition principle, homogenization material yield criterion obtained from mechanics models, which can be used as the lower limit of cell bearing capacity.
Finite Element Analysis of Dynamic Responses of Plain Concrete Pavements Under Strong Impact Loading
Authors: Zhou Xiao He , Ma Da Wei , Le Gui Gao
Published: November 2013

Plain concrete pavements under heavy impact loading will induce flexure, crack and direct shear failure. To obtain dynamic response and failure mode of plain concrete pavement under heavy impact loading, the concrete brittle crack model is adopted and finite element model of plain concrete pavements is established; the dynamic response and failure mode under heavy impact loading in different loading points and different loading times are studied; the production, stretching and extension of cracking are researched; which is a powerful reference for practical engineering application.
Parametric Analysis on Incrementally Launched Construction for Concrete Box Girder
Authors: Wang Ya Jun , Dai Jie , Qin Feng Jiang
Published: November 2013

The structural behavior of incrementally launched bridges in the construction stages depends on different parameters. Internal force of main girder is influenced by the dead load and stiffness of main girder, the length and stiffness of launching nose. Parametric analysis on the effect of internal force of an 8×60m-span concrete continuous box girder bridge was carried out. The results show that bending moment increases following the increase of weight and stiffness of corresponding segment of main girder. The phenomenon is even more obvious in the negative bending moment region of main girder segment nearby the launching nose. The bending moment of main girder reduces significantly when the stiffness ratio among launching nose and main girder is less than 0.15. While, the negative bending moment of main girder reduces significantly when the length ratio among launching nose and main span is more than 0.58.
Self-Supporting pH-Responsive Micro Porous Membrane from Copolymer PVA-co-PDEAEMA
Authors: Jiang Ping , Li Du Xin , Liu Yun Jun
Published: November 2013

Self-supporting pH-responsive micro porous membranes from Copolymer PVA-co-PDEAEMA were prepared via curtain coating process. The morphologies of the micro porous membranes were investigated by polarized optical microscopy. The above polymers were shown to form self-supporting membrane systems that were able to react on pH stimuli in terms of water flux.
Preparation, Characterization and Catalytic Application for the Synthesis of Tetrahydrofuran
Authors: Lei Yan Hong , Cao Xiao Hua
Published: November 2013

1,4-butanediol condensation can be performed with Cs-W - HPA. Cs2H4P2W18O62showed excellent catalytic performance for preparation of THF. In the optimal conditions, the reaction temperature was 180 °C, the reaction time was 43 min, catalyst dosage was 0.4 g, THF yield could reach 89.4%. And reused five times, the yield could reach 83.2%. HPA had the very good application prospect.
Study of the Kinetics of Hydration Process of Anhydrite Using External Exciters
Authors: Gazdič Dominik , Fridrichová Marcela , Kalivoda Karel , Stachová Jana
Published: November 2013

Due to the very gradual hydration of anhydrites and their very low strengths, modification of the properties of anhydrite by a suitable external exciter was resolved within the work. The experimental work was conducted on natural anhydride, and as possible exciters for hydration, the following products were selected and tested: water-free sodium sulphate; Portland cement CEM I 42,5 R; hydrated lime CL 90 Carmeuse. The dose of the exciter was consistent, i.e. 4.5 wt%. The affect on the increased speed of the hydrating process and the quality of the technological properties was monitored. The catalytic effect was evaluated by monitoring the course of the hydration process (using XRD analysis and thermo-gravimetric analysis) and also on the basis of the achieved technological properties.
Anti-Oxidation of Photo-Degradation Alkali Lignin
Authors: Ma Y. L. , Fang Gui Zhen , Li Shu Jun
Published: November 2013

Photo-degradation alkali lignin was prepared in sunlight by the system of TiO2 and squaraine dye (QSC). The antioxidant activity of photo-degradation was researched. The results showed that the phenolic hydroxyl of degradation alkali lignin is 5.63% with the control is 4.64%, and alcoholic hydroxyl of degradation alkali lignin is 3.21% with the control is 3.77%. The order of antioxidant activity was as following. 2,6-di-tert-butyl-4-methylphenol > high-phenol lignin > the control lignin.
Study on Acephate Wastewater Treatment with Immobilized Microorganism
Authors: Zang Shu Yan , Yin Li Li , Ma Yuan , Wang Ting Ting
Published: November 2013

Alginate-diatomite immobilized microspheres were prepared through immobilized biosorption of diatomite and Aspergillus niger by sodium alginate. Three major factors such as alginate concentration, diatomite content and embedding capacity on physical properties and microbial activity of Alginate-diatomite immobilized microspheres were investigated, and the optimal preparation conditions of Alginate-diatomite immobilized microspheres were determined as 2% of alginate, 1% of diatomite, 10% of Embedding capacity. Keywords: Embedded immobilization;Degradation; Acephate; Alginate; Aspergillus niger
Removal of Acephate and Hg2+ in Compounding Wastewater with Immobilized Microorganism
Authors: Zang Shu Yan , Yin Li Li , Ma Yuan , Wang Ting Ting , Wu Hai Xuan
Published: November 2013

Alginate-diatomite immobilized microspheres were prepared through immobilized biosorption of diatomite andMucor sp. by sodium alginate, which were employed to adsorb acephate and Hg2+in wastewater. Several major factors were investigated. Results showed that initial concentration of acephate and Hg2+were both 300ug/l, percent of adding immobilized microspheres full ofMucor sp.was 6%(m:m), rotating speed 160~200r/min. Keywords: Adsorption; Acephate; Hg2+;Mucor sp.
Bleachability of Pinus Kesiya Diethanolamine Pulp
Authors: Zhu Yong , He Jie , Chen Ke Li
Published: November 2013

Pinus kesiya was cooked by diethanolamine and kraft pulping respectively. And two kinds of pulp were bleached by H2O2and ClO2single stage and multi-stage bleaching. Then, their bleachability was compared. The results show that pinus kesiya diethanolamine pulp is difficult to achieve higher brightness only by H2O2or ClO2single stage bleaching, and its brightness could exceed 80%ISO by OD0ED1multi-stage bleaching. For diethanolamine pulp, compared with H2O2, ClO2bleaching effect is more obvious. And the increase of diethanolamine pulp brightness is less favorable than kraft pulp under these same conditions.
Study and Improvement of Oilfield Sewage Corrosion Test Methods
Authors: Jiao Kun , Qu Cheng Tun , Yang Bo , Qian Xie
Published: November 2013

The corrosion status and results in a certain water injection station in Shanbei oilfield were monitored and evaluated by flow corrosion test (FCT) (with homemade corrosion test device), static corrosion test (SCT), and water tank corrosion test (WTCT). The coupons after corrosion tests were observed by Scanning Electron Microscope (SEM). It was found that: the corrosion rates of SCT, FCT and WTCT were 0.0469~0.0552 mm/a, 0.5126~0.5299 mm/a, and 0.3250~0.3414 mm/a respectively; the corrosion rates SCT were much smaller than actual. The severity of pitting corrosion, pointed corrosion and other forms of local corrosion cannot be reflected by SCT. The corrosion rates and behaviors tested by homemade corrosion test device are more close and similar to the real.
The Application of Mathematical Statistical Method on Effectiveness Evaluation of a Low-Strength Complex Wastewater Treatment System
Authors: Jia Fu Quan , He Zhang Wei , Tian Zhu Jun , Chen Zhao Bo , Wang Hong Cheng , Chen Yi Meng , Jiang Bao Jun
Published: November 2013

Mathematical statistical method (MSM) is a very important wastewater treatment plant data processing analysis tool. In this study, MSM had been used to evaluate the efficiency, stability and reliability of the low-strengthen complex wastewater treatment system. Results showed that while LSCWWTs upgrading in the future, each influent parameter could be set as the follows: COD = 738 mg/L, BOD = 300 mg/L, SS = 454 mg/L, TN = 64.3 mg/L, NH3-N = 65.2 mg/L and TP = 7.65 mg/L. For effluent of LSCWWTs, the stabilities of COD, BOD, SS and TN were all A, TP was B, and NH3-N was D. For effluent COD, TN and NH3-N reached the first class discharge standard of A, the reliability probabilities were 83.89%, 80.23% and 99.43%, respectively. And the reliability probabilities of effluent WQPs reached the first class discharge standard of B were all more than 98%.
Discussion of Seawater Exchange Rate
Authors: Hao Yan Ni , Lin Jian Guo
Published: November 2013

Seawater exchange capacity of a bay is a key factor to determine the water environment quality,research of which is a basic issue in marine environmental science. Seawater exchange rate can directly estimate the marine environment capacity. This paper summarizes the computing methods of seawater exchange rate in a tidal estuary, analyzes the methods systematically and proposes some existing problems to explore in depth ,which prospects the development trends and the main research aspects in the future.
Research on Marine Environmental Quality and Oil Spill Influence in Dagukou District of Tianjin Port
Authors: Zou Feng , Zhang Guang Yu , Li Ming Chang
Published: November 2013

In this paper, marine environment in Dagukou district of Tianjin port is analyzed and evaluated. Marine oil spill accident is an important source of petroleum hydrocarbon in marine waters. So the simulation and forecasting of influence scope and trajectory of oil spill is a key means to obtain the hazard of oil spill to environmental protection target. A multi-module coupled oil spill model is constructed for simulating the influence scope and trajectory of oil spill, based on the coupling of the hydrodynamic model and wind field data.
The Analysis of The Urban Sewage Treatment Equipment Update Timing Based on Economic Life
Authors: Wang Chun Jie , Zhao Zhi Man , Zhang Xiao Mei
Published: November 2013

Choose an appropriate occasion for aeration equipment update, is an important problem faced by the wastewater treatment plant. This paper discussed the update of urban wastewater treatment equipment in the aeration equipment by economic life analysis methods, proposed a mathematical model and solving method of updating strategy,which is involved in a variety of cost factors and universal optimal,and is verified with examples.
Development of the Model for Determining of the Trophic Status of Shallow-Water Reservoir
Authors: Gusakova Natalia , Guseva Alena
Published: November 2013

A model for determining of the Taganrog Bay’s trophic status as per hydrochemical indexes is developed. The independent variables for the model are determined, they are: concentration of nitrates, nitrites, ammonium ion, phosphates, temperature, salinity and current velocity. The water reservoir’s trophic status research is conducted, its modern trophic status, the ecology allowable concentration of biogens and the ecology reserves for the water reservoir have been calculated.
Determination of Polycyclic Aromatic Hydrocarbons in Wastewater by Single-Drop Microextraction Coupled to Capillary Gas Chromatography
Authors: Sun Jian Qi , Qiao Bo , Sun De Si
Published: November 2013

This study describes an analytical method employing capillary gas chromatography (GC) using flame ionization detection (FID) that has been developed for the simultaneous determination of polycyclic aromatic hydrocarbons (PAHs) in wastewater, including naphthalene, 1-naphthol, 2-naphthol and anthracene. For this purpose, single-drop microextraction (SDME) was applied as a sample preparation technique. The SDME parameters such as types of extractants, volume of the microdroplet size, extraction time, stir rate and immersion depth of needle point were investigated and optimized. The method was linear in the ranges from 2.3 ×10-3to 70.0 μg·mL-1for naphthalene, 1-naphthol and anthracene, and 2.2 ×10-3to 50.0 μg·mL-1for 2-naphthol withR2≥ 0.9990. The SDME procedure allowed efficient recovery of the investigated PAHs ranging between 94 % and 104 % with a relative standard deviation (RSD) ≤4.2 for actual wastewater sampes spiked with 5, 10 and 20 μg·mL-1of PAHs, respectively. These results showed the potential of this technique for PAHs monitoring in wastewater samples. Furthermore, the investigated methods are simple, reliable, reproducible, and not expensive.
Study on Material Input of Coal Mines Production
Authors: Wang Jun , Wang Qing , Xu Xiao Chuan , Gu Xiao Wei
Published: November 2013

Based on the MIPS method, material input model of raw coal production was built. Taking two coal groups which were typical as investigation object, the material input coefficients of groups raw coal production were calculated. The results showed that the air input of unit raw coal was about 0.03t/t whatever it is open pit or underground mine for two groups. The water input of underground mine was slightly high above open pit mine and the average was 6.69t/t. The solid abiotic material input of open pit mine which was about 8.45t/t was far above underground mine which was about 1.36t/t. In the all full production mines of two groups, the water input proportion was biggest in unit raw coal production and the average was about 68.21%.The solid abiotic material input accounted for 31.49% while air was just about 0.3%.
Reduce Reuse and Recycle Behaviour Model for Academic Institutions Accommodation: A Proposal
Authors: Jibril Jibril Danazimi , Bin Sipan Ibrahim , Baba Maizan
Published: November 2013

Part of the growing environmental problem within academic institutions is the accumulation of solid waste in large volume and health risk it poses to humans and other living creatures. Waste generators non-challant attitude towards throw away culture is one of the major problems. An extended theory planned behaviour (TPB) research model which incorporates attitudes, subjective norms and perceived behavioural control will be used to understand the specific behaviour and identify the underlying factors which influence the behaviour of students towards reduce reuse and recycle (3Rs) program. The conceptual model will be used to develop a new system or improve existing systems of reduce reuse and recycle practice behaviour amongst the students within an academic environment, and provide a forum for discussion among researchers and practitioners worldwide.
Analysis of Flow in Power Plant Flue via Fluent Simulations
Authors: Chen Guan Yi , Yuan Guo Dong , Zheng Le Yu , Guo Xiao Ke , Lv An Long , Geng Ye , Cui Zhan Zhong , Long Hui , Yan Bei Bei , Ni Yu , Long Zheng Wei
Published: November 2013

The gas flow status including velocity and pressure in the rectangular gas duct (before or after) electrostatic precipitator of a power plant were simulated using Fluent software. The grid accuracy which is required by simulation has been determined then the gas flow status has been analyzed through the comparison between numerical simulation results and empirical calculation results. The results show that flues inner supporting structures are the main factor of gas pressure drops and outlet velocity distrubution.
Study on Microwave Drying Process and Drying Characteristics of Sewage Sludge
Authors: Li Jin Ping , Li Meng Yao , Yao Wen , Wang Ni
Published: November 2013

Combination of oven and microwave and only oven are two ways to study municipal sludge,and it investigates whether different size, microwave drying pretreatment, pretreatment time and oven temperature characteristics have effect on drying characteristics. The results shows that: using microwave to dry sludge need short time, the drying rate is fast, combination of oven and microwave has higher drying rate and lower energy consumption than only oven.
The Effect of the Long Fiber Bundles Bulk Density on Filtration Efficiency
Authors: Liu Zhong Bin , Wang Huan , Tang Juan
Published: November 2013

In the paper, taking the particles suspension for filtered object, the effect of the long fiber bundles bulk density on filtration efficiency was studied through the filtration experiments with the designed experimental equipment. And combining with the filtering model of long fiber bundle filter to do fluid analysis, the result show that, for the filtering velocity is 72m / h, in the filtration efficiency, filtration cycle, backwashing and other aspects of comprehensive performance of long fiber high efficient filter are best when the packed density is 73kg/m3.
Effects of Sewage Sludge Application on Contents of Heavy Metals in the Soil and Growth of Maize
Authors: Dai Liang , Gao Ya Mei , Zhang Jun Ping
Published: November 2013

Through pot experiments,the effects of various sludge loadings (0,40,80,120,200,280 t·ha-1) on growth of maize and sewage sludge application on contents of heavy metals in the soil were studied using sewage sludge from An-ning Plant of Wastewater Treatment of Lanzhou City. The results showed land application of sewage sludge increased significantly the contents of PbCuZn in the soil. The contents of PbCuZn in the soil did not exceed the standard of Environmental quality standards for soils for Grade II (GB-1518-1995) in china. Maize obtained good growth activities after land application of sewage sludge,maize height and biomass were increased significantly and were better than the control. Land application of sewage sludge inhibited maize seedling emergence and maize root length,showing the effects of dose-effect relationship with sludge application increasing. Maize root length was restrained significantly by heavy metals in the soil, the effects of heavy metals in the soil on plant root system should be considered with land application of sewage sludge. The optimal land application of sewage sludge is 80-120 t·ha-1.
The Research Progress on Oxic-Settling-Anaerobic Sludge Reduction Process
Authors: Yuan Quan , Wang Hai Yan , Zhou Yue Xi , Zhao Hua
Published: November 2013

The research progress on the oxic-settling-anaerobic sludge reduction process at home and abroad was reviewed, which was focused on the progress of sludge reduction mechanism, operating performance, impact factors and microbiological characteristics of OSA process. Then the shortcomings of the OSA process were analyzed and its development was also predicted.
Electrochemical Catalytic Oxidation Treatment of Coking Wastewater RO Brine
Authors: Wang Hai Dong , Gao Kang Le , Lu Bo Te
Published: November 2013

Coking wastewater RO brine is considered to be refractory, toxic, mutagenic and carcinogenic. Electrochemical oxidation has attracted wide attention in wastewater treatment because of its strong oxidation performance and ease of control. In this paper, the electrochemical degradation of NH3-N and COD were investigated at different anodes materials and current densities .The electrochemical oxidation using Ti/RuO2IrO2anode was effective and promising for advanced treatment of coking wastewater RO brine. COD and NH3-N concentration degraded 86% and 100% in 80min at the current density of 5 mA cm-2. Current density is the most important factor of organic degradation and energy consumption. When the current density was 10mA cm-2, the COD removal ratio quickly increased to 52.94% in 20min reaction time, but under high current density, the life of the electrode will be reduced. When the current density is too low, the electrolytic reaction time to reach standard needs to be 2h or more, which will perpetuate the equipment bulky, increase the cost of the equipment. The optimal current density is 5.0 ~ 7.5 mA cm-2. Unit per COD energy consumption is 114.4 kWh kgCOD-1, and unit per cubic meter wastewater energy consumption is 5.9 kWh m-3at the current density of 5 mA cm-2.
Numerical Simulation on Flow Field of Coal-Fired Power Plant Flue Pipe with Inner Supports
Authors: Cui Zhan Zhong , Geng Ye , Yuan Guo Dong , Chen Guan Yi , Long Hui , Yan Bei Bei , Long Zheng Wei
Published: November 2013

The flow distribution in flue pipes has a great effect on collection efficiency.Gas pressure and velocity distribution in flue pipes upstream electrostatic precipitator were investigated using computational fluid dynamics (CFD) in this paper. The flue pipe model was established on the basis of standard straight and bended flue pipe which were widely used in engineering. And the availability of numerical simulation model was verified by comparing the empirical curve and the numerical simulation results of a common pipe bend without inner supports. In the same condition, these two flue pipes were simulated. The result shows that inner supports have great impact on flue pipe and the values of the pressure drops are closely linked to airflow directions. These results can provide theoretical basis and method guidance for design of inner support.
Fuzzy Decision of Antiquated Buildings Demolition Method
Authors: Gao Xu Kuo , Wang Qiong
Published: November 2013

The article discussed the demolition way of antiquated buildings and the influencing factors of strategy optimization, and then it set up the index optimization system, using fuzzy analytic hierarchy process (FAHP) to determine the demolition scheme for the antiquated buildings, and ultimately selected the optimal way. Through comparison and analysis, selective demolition is the optimal choice in the demolition process of the antiquated buildings.
Optimization of Conditions of Digested Sludge Using Landfill Biocover Material for Enhance Methane Oxidation
Authors: Zhao Ling , Cheng Xiao Gu , Suo Jun Chang , Yin Ping He
Published: November 2013

The modified digested sludge (MDS) can be used as landfill biocover that serve to minimize CH4 emissions by optimizing CH4 oxidation. MDS composited by coal ash and digested sludge was studied in this paper. The permeability coefficient and the compressive strength of MDS were tested in full factorial L9(34) experiment using simulation column. Results show that when the mix ratio of coal ash and digested sludge is about 1:1-1.5:1, the permeability coefficient < 10-4 cm/s and compressive strength 50 kPa, MDS can meet the engineering requirements for landfill operation. The optimal conditions of MDS were as follow: mix ratio of coal ash/digested sludge = 1:1, nutrient solution = 0.05 ml/g, thickness of biocover = 400mm, and moisture content of MDS = 40%. The maximum CH4 oxidation efficiency was 88.6% and the volume flow rate of CH4 was 0.75 mmol/(kgd) under the optimal conditions.