bluuebunny/crossref_metadata_2025 huggingface dataset:
Combination of High Pressure and Thermal Hydrolysis Pretreatment Effect on Sludge
Authors: Li Guang , Jiao Xiao Xia , Li Jing , Han Xiang Kui , Wang Lian Peng
Published: November 2013

In 110-190°C for 15-75 min of excess sludge thermal hydrolysis experiment, inspected the volatile suspended solid dissolution rate, the concentration of sludge SCOD, TCOD, components of organic acids in the supernatant fluid changes,such as sewage thermal hydrolysis characteristics, analysis the effect to improve the performance of sludge anaerobic digestion. The results show that with the increase of thermal hydrolysis temperature and time, SCOD and VFA in the sludge supernatant on rising. Under the condition of 190°C,75min, SCOD and VFA reached a maximum of 6674 mg/L,2630 mg/L; Release of sludge organic dissolved solids,COD and other major completed in the first 45 min,after 45 min changed little; Thermal hydrolysis temperature was between 90~170°C,sludge anaerobic digestion performance increases with temperature,when the temperature was higher than 170°C,sludge anaerobic digestion performance began to decline.
Utilizing Sea Sand in Construction
Authors: Jiao Shuang Jian , Wang Shuai
Published: November 2013

With the reduction of natural river sand, the application of sea sand is on the increase. When sea sand is directly applied in engineering, steel bar will be eroded and thus has an impact on the durability of concrete. Adopting perfect desalinization method and carrying out strict management measures can help to promote the use of sea sand.
New Thermal Insulating Material Based on Geocement
Authors: Petranek Vít , Guzii Sergii , Krivenko Pavel , Sotiriadis Konstantinos , Kravchenko Anastasiia
Published: November 2013

A new thermal insulating material was developed on the basis of a geocement, formulated as Na2OAl2O36SiO220H2O. Ground limestone and aluminosilicate pellets were used as fillers for its production (composition: geocement 64.29 wt. [%]; fillers 35.71 wt. [%]). This material, which is applied having a thickness of 3.0-4.5 mm, swells when it is exposed to an external heat flow of 1273 K average temperature. Swelling is due to the matrix phases and filler dehydration, which include heulandite, ussingite, sodium zeolite and other phases. As a result, a finely porous glassy aluminosilicate frame of jadeite-albite composition is formed, which is characterized by low thermal conductivity (0.09-0.175 Wm-1K-1). The developed material can be used to protect and to insulate wooden, metal and concrete surfaces from an one-sided heat source.The paper is dedicated to the great scientist of the XXI century in the field of alkali-activated cements and materials based on them, Pavlo Kryvenko, in honor of his 75thbirthday anniversary.
A New Metal Ore Karst Deposition Form - Case Study for Dolomite Residual Deposit in Dongxiang Copper Mine, Jiangxi Province, China
Authors: Yan Zhi Wei , Liu Hui Li , Zhang Zhi Gan , Li Shui Xin
Published: November 2013

The Kcd (Karst colluvium and deluvium) deposit of Dongxiang copper mine had long been considered as a kind of ancient diluvium, alluvium and proluvium in Cretaceous Karst depression. Based on lithology and morphology analysis of Kcd, and further research for regional hydrogeology and hydrogeochemistry, it was considered as a new special Karst deposition form of metal ore in this project. In the oxidation zone of sulfide mineral deposit, Kcd was a deposition mixture of dolomite powder (sand) and eluvium of dolomite wall rock, which were generated by the action of sulfuric acid water on wall rock, and the collapse deposition from the overlying K2n red beds. This kind of deposition was still generating and developing today. The monoclinal structure, primary sulfide mineral deposit occurred in clastic rock and claystone, dolomite and siliceous dolomite with 160m deep in underground water system, all that provided the development conditions of metal ore Karst deposition. This viewpoint could not only guide the copper ore exploration of Dongxiang type, but also provide a good case for Karst development in sulfide mineral areas.
The Research of High-Resolution Sequence Stratigraphy of Putaohua Reservoir in Daan Oilfield
Authors: Li Ting Ting , Shi Yue , Sun You Hai , Qin Ming
Published: November 2013

By using geological and geophysical data and according to the basic characteristics of sequence boundary, Putaohua Reservoir in Daan Oilfield is divided into a rise hemicycle in long-term cycles, a full middle-term cycle, nine short-term cycles and a number of ultra-short-term cycles.The high-resolution sequence stratigraphic framework of Putaohua reservoir under monosandbody rank is established, and a set of techniques and methods to high-resolution sequence stratigraphy correlation in shallow delta is summed up.
Analysis of Down Resistance of the Measuring and Adjusting Apparatus in Lubricator of Oilfield Injector
Authors: Ma Chun Bao
Published: November 2013

In the later period of water distribution to increase output of oilfield, it is difficult for the measuring and adjusting apparatus going down in the lubricator when the wellhead pressure reaches to some value, in separate zone injection testing. For this reason, we analyzed its reasons through theoretical derivation and experiments. According to the basic theory of statics of fluid mechanics, we derive and set the mathematical model among the static pressure differential of measuring and adjusting apparatus and the main factors such as wellhead pressure, cable diameter, etc. Indoor experiments and field testing jointly, we set the relationship of wellhead pressure affect the friction between the packing and the cables. The result: down resistance of measuring and adjusting apparatus in lubricator is linear with wellhead pressure and it is square with cable diameter, friction force between the packing and the cables have no big change while the wellhead pressure changes. Through the study of firing resistance, we can calculate the additional weight needed accurately when measuring and adjusting apparatus in lubricator fire and down, and provide theoretical basis for optimizing running parameters and heightening testing efficiency.
The Management of Crude Oil Handover Mouth and Discusses the Problems of the International Standard
Authors: Su Chong Yong
Published: November 2013

International and domestic crude oil metering gap, difference between oil volume measurement and quality measurement, and crude oil metering standards are discussed
Review and Outlook on Technologies for Developing PetroChina Low-Permeability Reservoirs
Authors: Fu Xiu Juan , Ji Shu Hong
Published: November 2013

The technologies applied to develop PetroChina low-permeability reservoirs are summarized in the past more than 20 years. These technologies include water injection in advance, waterflood pattern optimization, fracturing and horizontal wells, etc. In addition, future technology trend is also forecasted.
Strength Assessments of Concrete-Filled Steel Tubular Support of Soft Rock Roadway
Authors: Qu Guang Long , Gao Yan Fa , Yang Liu , Xu Bin Jing , Liu Guo Lei , Meng De Jun
Published: November 2013

Compared with I-shaped and U-shaped supports in soft rock roadway, concrete-filled steel tubular (CFST) support, as a new supporting form, has stronger bearing capacity with reasonable price. So it is becoming more and more popular in roadway supporting of coal mine in China. In this article, the surrounding rock in soft rock roadway was classified into three different types: hard rock in deep coal mine, soft surrounding rock, extremely soft surrounding rock. And, according to the characteristics of deformation failure of the CFST support and the surrounding rock in the industrial tests, three different strength assessments, including assessment of axial compressive strength, assessment of lateral flexural performance, assessment of hardening rate of core concrete, were proposed through mechanical analysis and laboratory tests for the three different types of the surrounding rock, respectively. Moreover, aimed to insufficient flexural strength of the support or low hardening rate of the core concrete in some of the roadway supporting, strengthening lateral flexural performance or making early strength concrete was necessary for the above unfavorable situations. The laboratory test results showed that the ultimate bearing capacity for the CFST support with φ194*8mm of steel tube reinforced by φ38mm round steel was 31% greater than that of the unreinforced one, 177% greater than that of the U-shaped one with equivalent weight per unit length.
The Patterns of Management and Utilization of Landslips and Corresponding Landscape Ecological Reconstruction in the Coal Mine Area in China
Authors: Dong Jia Hua , Jiang Da He
Published: November 2013

Landslip in coal area is a special kind of ecological landscape. Now, the ecological restoration and reconstruction of the landscapes has become more important due to man-made destruction, such as structural and functional degradation, severe damage of its utilization value and service function. The productive and living functions are restored, and eco-economical benefits and aesthetic value were increased through rehabilitation and reconstruction of the ecological landscape in coal area. The present state and the types of the landslips in the coal mine area were first discussed; then, several patterns of the correspondent management and utilization fit for different types of landslips are sought out; and then, the Teng-nan Coal Mine in Zaozhuang city in China was taken as an example to analyze the benefits of the utilization and management. Finally, the ecological reconstruction of landscape in landslip area was under discussion.
The Efficiency Calculation and Structural Optimization of Eddy Composite Drainage and Gas Recovery
Authors: Ma Chun Bao
Published: November 2013

Part of the gas fields utilize eddy current instruments to drainage and gas recovery currently, while the mechanism of drainage and gas recovery is not clear. This article conducts drainage and gas recovery simulating caculation, analyses the impact of gas flow rate, the moisture content of bottomhole and eddy current tool structure of its drainage effect, basing on the theory of gas-liquid two-phase flow. The results show that: the gas flow rate, moisture content and the normal section shape of eddy current tool spiral piece are the main factors that affect the eddy current tools draining. As follows: the larger the gas flowing rate, the better the tool draining effect; when the bottomhole moisture content is less than 10%, the draining effect is not obvious; but when the bottomhole moisture content is greater than 10%, with higher the moisture content, the draining effect is more obvious; the normal section shape of spiral piece is better to be rectangular rather than trapezoidal; the direction of rotation of the spiral piece (left and right hand) has little effect on draining.
Performance and Economic Evaluation of Ground Heat Exchangers
Authors: Yoon Seok , Cho Nam Hyun , Go Gyu Hyun , Lee Seung Rae
Published: November 2013

This paper presents experimental study on the evaluation of thermal performance of U and W type ground heat exchangers (GHEs). These GHEs were installed in a partially saturated landfill ground which was composed of silt and clay in the runway area of Incheon International airport. Thermal performance tests (TPTs) were conducted for 100 hours under the continuous operation condition. Heat exchange rate of individual GHE was evaluated from the TPT results, and construction cost was also estimated. The required Borehole length of U and W type GHEs was calculated considering real construction condition from GLD (ground loop design) program.
Evaluation of Parameters for Louver Design Algorithm Based on Direct Solar Radiation Control Performance
Authors: Choi Jae Pil , Lee Taek Young , Ahn Eui Soon , Piao Gen Song , Lim Jang Hyun
Published: November 2013

The purpose of this study is to develop an algorithm that designs parametric louvers with excellence in environmental performance. Through the examination of the previous researches, all the possible geometric parameters of the louvers are listed. All of the listed parameters have undergone a parameter sensitivity test for their yearly direct solar radiation control performance. The research concludes with the refined list of valid formal parameters for the development of a parametric louver design algorithm.
Variation of Indoor Air Quality among Urban Public Venues in Kaohsiung City, Taiwan
Authors: Lu Mei Fang , Lin Jim Jui Min
Published: November 2013

Modern people spent nearly 90% of their time indoor, and therefore, indoor air quality can directly affect our health. Recently, air quality has been much more emphasized than ever. Since 1970s, many studies have shown that the indoor air quality (IAQ) at urban areas can be worse than the outdoor air quality. To investigate the current condition of urban indoor air quality as well as differences between various types of public venues, this study used either a direct-reading instrument or the method proposed by the Taiwan Environmental Administration (TWEPA) for monitoring indoor air quality. The acquired data were used for variation analysis of indoor air quality of different public venues. Fifteen public venues were selected in this study for monitoring their indoor air quality, and among these 15 public venues, four of them are Category I venues, while the remaining eleven are Category II venues. The measurement was conducted twice at each of the public venue, and the monitored pollutants are CO2, CO, HCHO, TVOC, O3, PM10, PM2.5, bacteria, fungi, humidity, and temperature. The results suggested that there were nine public venues in the first sampling and seven public venues in the second sampling with indoor air pollutant concentrations exceeding the standards. Furthermore, the concentrations of CO2, CO, and O3, from the two measurements exceeded the indoor air quality standards. Therefore, CO2, CO, and O3can be considered as the main contributors to the poor indoor air quality of public venues. The high concentrations of CO2and O3indoor are related to population density and the use of O3generating machines, printers, or photocopiers. As for CO, the high concentration is because of the spread of exhaust gases from vehicles or factories may penetrate from outside to the indoor.
The Interval Analysis for Uncertainty Heat Transfer Process of Phase Change Thermal Storage Based on Perturbation Method
Authors: Li Zhi Yong , Wang Zheng Yong , Fan Qu , Wu Zhan
Published: November 2013

Due to phase change materials (PCMs) composition, machining error, measuring error and other factors, the PCMs thermal physical properties, geometric properties, etc are usually uncertain. As a result, phase change heat transfer process is an uncertainty heat transfer process. But at present, heat transfer characteristics research on phase change thermal storage are all based on certainty heat transfer models (Taken uncertainty factors as certainty factors). In this paper, it is considered factors uncertainty influencing phase change thermal storage heat transfer process. By looked on the variation scope of influence factors as "interval number", based on interval mathematics, perturbation method and finite difference method, "interval number" heat transfer model of phase change thermal storage is established. In this model, the uncertainty variables are decomposed into the sum of the nominal value and the deviation value. PCM uncertainty temperature field can be determined by calculated nominal value and the deviation value of PCM temperature field separately. Comparison between simulation results of the model and experimental data implies that it is necessary to consider influencing factors uncertainty in phase change thermal storage heat transfer analysis.
Experiment of Sheng Li Lignite Combustion Kinetics under Oxygen-Enriched Conditions
Authors: Zhang Yong Feng , Zhou Quan , Li Chun Ping , Bai Jie , Chen Xiang Yun
Published: November 2013

The characteristics of Sheng Li (China) Lignite combustion under oxygen-enriched conditions were studied by thermogravimetric analysis , including TGDTG and DTA. Experiments on lignite combustion were carried out under four kinds of oxygen-enriched conditions (O2/N2mixture atmospheres) and with a heating rate of 10°C/min. The experiments of working temperature range was 20°C-900°C. The combustion process, regarded as the first order reaction, was analyzed through the Gorbachev kinetic equation participants, which gained the conclusion that Sheng Li lignite combustion reaction shift to low temperature zone and kinetic parameters of combustion increase gradually when oxygen concentration increase.
Study and Determination of Evaluating Indicator of Public Building Energy Consumption in Hot Summer and Warm Winter Area
Authors: Sun Hai Li , Wang Zhi Chao , Lu Jun Jun
Published: November 2013

Determination of buildingenergy consumption index is important for building energy saving.This paper simulits energy consumption of fifty public building(incluiding 15 non - government office buildings, 11 government officebuildings, 12 shopping malls, 12 hotel buildings) after abandoning theunreasonable design and operation factors. We can obtain the building total energy consumption index andpartial energy consumption index.Then all types of building energy consumptiondata are processed with the method of mathematical statistics.We can get fourtypes of biuding energy consumption index and partial energy consumptionindex.This study can provide the basis for energy-saving operation andenergy-saving reformation.
The Overall Design of a Certain Type System Maintenance Environment Simulation and Integrated Detection System
Authors: Zhang Wei , Liu Jun Xian , Qiu Chuan Fei , Zhou Quan Zhi , Xu Fei
Published: November 2013

Because of the restriction of many factors such as system complexity, the maintenance and support agencies of a communication control system can not be detected and debugged faulty equipment or systems, a maintenance environment simulation and integrated detection system has been designed in this paper, which expounded system design ideas in the general scheme.
Laboratory Measurements of Masonry Using Post-Tensioning
Authors: Stara Marie
Published: November 2013

Contribution deals with laboratory measurements of deformations in the place exposed to local load caused by additional pre-stressing. The measurements are made at the masonry corner built in the laboratory equipment. The laboratory equipment was designed at Faculty of Civil Engineering VSB - TU Ostrava for measurement tri-axial stress-strain conditions in masonry. In this masonry corner two pre-stressing bars are placed. These bars are in different height and are anchored to the anchor plates, which transfer pre-stressing forces to the masonry. The masonry was pre-stressed in the both directions. The specimen for laboratory testing is performed in the proportion to the reality of 1:1.
GIS is Applied to the Landslide Stability Evaluation - A Case Study of Erman Mountain Landslide
Authors: Zou Zu Yin , Zhu Zhi Ming , Zhou Kai Rui , Tan Chun Hong
Published: November 2013

The geological disaster is one of the important research contents of the field of Earth Science. In this paper, the method of theoretical knowledge,field surveys and laboratory experiments is adopted.The Erman Mountain in Hanyuan County is the research object.Analysis the environmental conditions,development characteristics and mechanism. Select the characters of landslide, geological structure, elevation, slope, slope, earthquake, rainfall and other factors as analysis variables. Combine GIS with fuzzy mathematical evaluation method, develop the landslide stability evaluation plug-in and then divide the risk regionalization of study area, in order to avoid occurrence of geological hazards in the area, reduce casualties and property losses. The results show that The occurrence of landslide areas are mainly concentrated in the elevation at about 1600 m and 30° ~ 50° slope area.With the increase of height and slope, the possibility of landslides is increasing.
Analysis of Locking Value of Anchor Cable in Pile Anchor Supporting Structure
Authors: Chen Jie , Wang Dong , Feng Chun Lei
Published: November 2013

This paper analyses the problem of locking value of anchor cable of pile anchor supporting of a deep foundation pit in the north of Kunming city. There are many influencing factors of locking value of anchor cable such as relaxation loss of anchor cable materials, tensioning system, pre-stress loss caused by anchorage friction, geological conditions and so on. And the author put forward the corresponding treatment measures for achieving the stability of supporting structure.
Research for Non-Destructive Detection of Vertical Prestressed Tensile Force in Box Girder
Authors: Wu Bian , Cui Wei , Sun Jia Long , Long Yi Yu
Published: November 2013

Fine rolled twisted bars as the vertical prestressed reinforcement has been widely used in the prestressed concrete box girder, but it is hard to effectively control the loss of prestressed force in the practical engineering. Too much loss of prestressed force will lead to diagonal cracks in box girder webs. According to the dynamic theory, take the exposed segment of fine rolled twisted bars as the beam model, take the anchorage segment as a rigid arm and two elastic supports, this article establishes the plane elastic support model of vertical prestressed fine rolled twisted bar. The nonlinear relationship between vertical prestressed tensile force P and the plane stiffness of elastic supports K is established by an indoor experiment, and at the same time the anchoring section stiffness coefficient method is used to verify the effectiveness of this method and conduct an engineering application. This paper provides a theoretical basis for the test of vertical prestressed tensile force in box girder.
Regional Internet Environmental Air Quality Monitoring System
Authors: Gao Hong Bin , Zheng Yan
Published: November 2013

With the increasing emphasis on national environmental issues, air quality has increasingly aroused peoples discuss. Therefore, it is significantly meaningful to devise a set of monitoring for regional air quality system. This paper introduces the design of a sensor network based on air quality monitoring system. It has achieved the purpose of air quality of real-time data collection with long-distance transmission, which has the characteristics of light weight, convenient, easy to layout. The system ether adopts CC2530 SCM and the relative sensor data acquisition, or utilizes ZigBee to realize the collection of air quality data consisting of a star network. The GPRS module provides the original data by UDP protocol.
Comparative Study of On-Site Corrosion Monitoring for Concrete by Different Methods
Authors: Fang Xiang , Chen Long , Pan Jun
Published: November 2013

As one of the key steps in the process of durability design and redesign, corrosion monitoring of reinforcement in concrete is of importance. To ensure the concrete durability of the quay structure, corrosion monitoring systems are utilized in Port Said East Container Terminal - Phase 2, Egypt. Embedded half-cell potential reference electrodes and anode ladder systems were used together. Early stage corrosion monitoring data in a precast slab is presented. Comparison of half-cell potential and anode ladder system data give some comprehensive understanding of the mechanism of the corrosion monitoring.
SHM of Historic Damaged Churches
Authors: Boscato Giosuè , Dal Cin Alessandra , Russo Salvatore , Sciarretta Francesca
Published: November 2013

The paper shows the results of monitoring activities to check the structural response and the level of damage of two historic monument of LAquila: San Pietro di Coppito and Santa Maria Paganica, that were damaged by the main earthquake of April 2009.
The diagnostics operation was planned and carried out in situ and in laboratory to verify the integrity of the residual stiffness of the structures and to define the mechanical parameters of the material. The mechanical characterization of materials was carried out through destructive tests on samples, taken directly on site, and micro-destructive tests through single and double flat jacks. To give a first qualitative assessment of overall was used sonic test (non-destructive test) on the main macro-structure. The global structural health monitoring (SHM) was carried out through ambient vibrations to define the real dynamic behavior in serviceability state and to calculate - via a modal identification of output-only systems-the dynamic parameters (mode of vibration, frequencies, displacements and damping ratios). The aim of this research is to prove the reliability of different diagnostic methodologies, the real extent of global and local damage and the extent of the residual stiffness of the macro elements of the structures (façade, tower, walls of nave, transept) that are subjected to different mechanism of failure.
The Effects of Land Use, Design and Environment on Traffic Fatalities
Authors: Xu Jian , You Ke Si
Published: November 2013

Developing statistics methods to distinguish significant factors associated with roadways is one of the most feasible accesses to understand the nature of traffic accidents. In this study, zero-inflated negative binomial (ZINB) model was developed to allow for overdispersion and excess zeros, as well as the factors of land use, design and environment to examine the effects. The statistical tests show that ZINB model is preferred to zero-inflated Poisson and negative binomial models due to its ability to describe crash counts associated with severe injuries and fatalities more effectively. The results show that fatalities are positively associated with segment length, surface width, land use variables and rainfall. For example, an increase of one inch rainfall will result in an increase of 0.02% in fatalities. Interestingly, distances to hospitals yield positive impact, which suggests that longer distances lead to higher fatalities, presumably due to time lost in transporting crash victims to hospitals.
Fractal Dimension in Time Series of Expressway Traffic Flow
Authors: Zhang Wei , He Xin
Published: November 2013

The correlation and Hausdroff dimensions of traffic flow and speed series are analyzed based on the Fractal theory. Using the traffic flow data of four typical expressways in China as input sample, the data statistical results indicates that both synchronized and free flow state are fractal and chaotic. In addition, traffic flow rate and speed time series are determined by different intervals and then G-P arithmetic is applied to estimate their correlation dimensions and the Hausdroff dimension. The results also illustrates that Fractal dimension could by clearly identified, which provides a useful tool for expressway operation management and facilities provision.
The Quality Control and Evaluation of Road Traffic Flow Data
Authors: Gu Yuan Li , Ma Yun Nan , Li Ju Wei
Published: November 2013

Dynamic traffic data quality evaluation can provide reliable data support for the traffic management system. This paper aim at three kinds of common failure data, put forward the traffic flow data quality control methods and process. First time evaluate the data quality in three stages, and each stage respectively for all kinds of ITS detector, and builds the six index system. Finally take Beijing as an example to analyze and verify the method of this paper.
Spatial and Temporal Characteristics for Traffic Congestion Based on Microwave Data
Authors: Gu Yuan Li , Yan Xiao Qian , Wu Jing Yi
Published: November 2013

Based on empirical microwave data on the second Ring Road in Beijing, spatial and temporal characteristics of traffic congestion were analyzed. Three specific indexs for the congestion have been analyzed, i.e., congestion duration, time percentage of traffic congestion and key congestion sections. The hazard-based traffic congestion duration model was established through survival method. Temporal-spatial distribution of traffic congestion was studied using non-parametric method. The discrepancies of traffic congestion on different time and different links were considered. Results show that there has a big difference on congestion duration and congestion number between different links. Hazard rate will be less than 10% when congestion lasting more than 20 minutes. Three characteristics of the key congested points are confirmed. The judgment for key congestion sections show that key congestion segments have original affect to other sections.
Multi-Lane Lane-Changing Model under the Influence of Heavy Vehicles
Authors: Yang Xiao Fang , Wang Jian Rong , Wang Xin Zhu
Published: November 2013

This paper presents a new lane-changing model of multi-lane mixed traffic flow. The influences of heavy vehicles on lane-changing are analyzed. An improved accumulated speed benefit model is proposed in which drivers generate lane-changing intentions based on accumulated speed benefit of preceding vehicle in target lane over the preceding vehicle in current lane, not just relative to the speed and desired speed of subject vehicle. Drivers may accelerate or decelerate during lane-changing due to different traffic conditions. Simulations show that with the increase in the proportion of heavy vehicles, lane changing frequency first increases and then decreases. The model is validated with empirical data.
Model of Confirming Number of BRT Parking Space Based on Queuing Theory
Authors: Liu Jia Hua
Published: November 2013

Queuing in the bus station often causes traffic jam which will influence the run of the system owing to the fact of the special of the BRT system. It was after analyzed the fact of the BRT system, created the model about the probability of the vehicle reaching the station without queuing and other service index by use of the queuing theory in order to calculate the number of BRT parking space. The calculating result which is based on the Shangshe bus station of Guangzhou BRT system show that the model is reasonable and effective.
Superior Research for Selection of Bracing Structure of Deep Pit Foundation Based on Fussy Theory
Authors: Li Dong
Published: November 2013

Before the construction of the deep pit foundation, we must choose a project. Although there aren't many projects to be chosen as usual, we often feel that it's a very complex and hard work. Actually there is no a mature and general model to use. In this paper, the author attempted to use the theory of fuzzy math to establish a former to select the best project, meanwhile provided two ways to solve how to quantify the qualitative targets and how to determine the weights of the targets. Finally they were confirmed to be useful and successful by a practical engineering application. It is worthily to popularize these scientific methods in construction and management in deep foundation pits.
Study on the Mechanical Behavior of Long-Span Steel Truss Transfer Storey
Authors: He Ming Wei
Published: November 2013

The analysis to the staged construction of the long span steel transfer truss was performed. The focus was on the stress and deformation analysis of the transfer truss, the interactions of the transfer member with the concrete tube, and the combination analysis of the steel girder and concrete beam. It was proved that the method of staged construction can get the good result that can make full use of the characteristic of the steel material, make steel truss bear more load effect in the construction stage. So the load to the concrete tube is lessened, which makes the load effect of the structure is more rational. Some advices for the construction and design of steel transfer truss is also provided.
Keywords:Steel truss; Transfer story; Staged Construction.
Applications of PLAXIS 2D in the Calculation of Sheet Pile Wharf Structure
Authors: Xu Ke , Zhang Shen
Published: November 2013

This paper attempts to use PLAXIS 2D for calculation sheet pile wharf, mainly introduces this methods simulation process, parameter selection and so on. Using this method for a underground continuous wall structure to simulate, calculate and analysis. The results with the actual criterion calculating results come very close.
Analytical Solution of the Star-Shaped Crack in One-Dimensional Hexagonal Quasicrystals
Authors: Guan Lu , Chen Zhu
Published: November 2013

With the use of complex analysis, and by introducing adequate conformal mapping, the anti-shear problem of the star-shaped crack in One-dimensional Hexagonal Quasicrystals was studied. An analytical solution to the crack tip stress intensity factor is found.
Theoretical Analysis and Experimental Research of the Absorption Property of a Variable Cross-Section Diffsorber
Authors: Gu Lin Qiang
Published: November 2013

The internal impedance and radiation impedance of a variable cross-section diffsorber were calculated, when adding bandage to the nozzles of tubes of diffsorber, or using non-linear sound resistance to provide appropriate additional internal resistance, the diffsorber will become an excellent sound absorber. Without bandage, the absorption coefficient of the testing sample is larger than 0.7 during 100Hz-2000Hz, and exceed 1 during 500Hz-800Hz; with bandage, the absorption coefficient of the testing samples is no less than 0.8 during 250Hz-4000Hz, and is above 1 during 250Hz-2000Hz. The performance of absorption begins to reduce from 5000Hz to higher frequency due to the mismatch of internal impedance and radiation impedance.
A New Method for Analysis on Geo-Stress Field Fitting
Authors: Shi Ping , Chen Zhang Hua , Ji Hong Guang
Published: November 2013

Geo-stresses distribution of mining areas was analyzed by means of the partial least squares regression method (PLSRM). Based on the data measured in Wushaoling tunnel ridge section, numerical simulation of initial geo-stress field around the area had been done using the commercial software called ANSYS. PLSRM was achieved through actual measurement data and calculation results of geo-stress, then fitting data was ready. Compared with the traditional method of least squares, it is suggested that, due to the advantage of principal component analysis in applying PLSRM, present method can effectively reduce regression error caused by correlation between response variables. It can more effectively reflect the features of discontinuous geo-stress distribution in comparing to the method of traditional least-squares analysis. Therefore, it can provide effective data support for the establish of geo-stress field and it is applicable in back analysis on initial geo-stress field.
Influence of Concrete Pouring Sequence on Stability of Different Height High-Formwork Support System
Authors: Liu Li , Wang Fang , Wang Ju Chao
Published: November 2013

This article used ABAQUS finite element analysis software to established the high-formwork, analyzed effect on stability of the different height formwork by contrasting lateral displacement of various heights, discussed influence of concrete pouring sequence on stability of different height high-formwork support system in the construction process. From the simulated result, it can be seen that with the increase of height, the lateral displacement increased gradually when poured in dissymmetrical way, but the stability of high-formwork decreased, the result also provides evidence for code revision.
Preparation of CuO Microspheres Consisting of Nanosheets and their Catalytic Activity in Degradation of Methylene Blue with Hydrogen Peroxide
Authors: Liao Jin Yun , Li Hao
Published: November 2013

In this study, CuO microspheres were synthesized by a facile hydrothermal method. X-ray diffraction pattern indicated that the as-prepared CuO sample is presented in monoclinic phase and field emission scanning electron microscope images demonstrated that CuO were composed of CuO nanoplatelets. The catalytic activity of CuO microspheres in the degradation of methylene blue (MB) with H2O2 was investigated. It was found that the degradation ratio of MB was less than 7% in the absence of CuO catalyst, while the degradation ratio can reach about 88% in the presence of CuO catalysts. It was revealed that the degradation efficiency of MB was the highest when the dose of CuO catalysts was 20 mg.
Alternative Preparation of Sulphated Binders from Secondary Raw-Material Resources
Authors: Fridrichová Marcela , Dvořák Karel , Hájková Iveta
Published: November 2013

The insufficient occurrence of raw material resources on our territory was one of the historical reasons for marginal production of sulphated binders from secondary raw-material resources. Also the unprofitability of material production based on calcium sulphate was related to this fact. This was changed in the end of the last century when formation of waste raw materials increased with industrial development. Secondary gypsums became basic raw material for production of plaster boards, plaster mixtures and anhydrite self-levelling mixtures.
Wet flue gas cleaning desulphation process during which the energogypsum is formed is nowadays realised in major part of our power stations. Annual production of the energogypsum produced in this way in particular power stations is about 250 kt. The energogypsum is generally stored in stock piles as a so called stabilisate and partially is delivered to cement works as a solidification regulator.
Chemogypsum is produced in chemical works where waste waters with content of SO42- occur, which must be desulphated with lime in water ambient. Further it is formed in citric acid productions where also sulphated waters occur. Last but no least it is also produced in industrial production of phosphates. Production of titanium dioxide is another example of the industry where the possibility of gypsum formation exists.
The Kuroshio Nutrient Transport during Winter of 2009
Authors: Long Yu , Zhu Xiao Hua , Guo Xin Yu
Published: November 2013

To confirm Spatial variations of Kuroshio nutrient transport from the East China Sea to South of Japan, we apply an inverse method to hydrographic data from sections across the Kuroshio path from the East China Sea (Sections PN and TK) to south of Japan (Sections ASUKA and 137E) to get absolute geostrophic velocity, then the nutrient flux (velocity times concentration) and nutrient transport (integration of flux over a section) were calculated. In addition, Section OK east of the Ryukyu Islands was also examined. The nitrate flux during winter of 2009 shows a subsurface maximum core with a value of 11, 15, 7, 19,and 10 mol m-2s-1at Sections PN, TK, OK, ASUKA and 137E, respectively. The depth of subsurface maximum core is about 280, 470, 800, 200, and 470 m at Sections PN, TK, OK, ASUKA and 137E, respectively. The eastward nitrate transport is 248.6,213.3,97.7,804.3,879.0 k mol s-1at Sections PN, TK, OK, ASUKA and 137E, respectively. Comparisons between nitrate transport through Section ASUKA and the sum of transports through Sections TK and OK and nitrate transport of Section 137E, suggest that the Kuroshio recirculation south of Shikoku can significantly intensify the eastward nitrate transport by the Kuroshio and therefore plays an important role in the nitrate transport in the Kuroshio region.
Chinese Construction Enterprises HSE Management
Authors: Liu Lin Lin
Published: November 2013

China's current economic development in the construction of large-scale historical stage, the construction industry as its pillar industries, construction tasks undertaken increasingly diverse, employing industry has become China's largest labor groups, their health, safety and environmental issues is even more affected by our state and society. However, as more and more construction projects, process more complex, especially from the last three years the national production safety situation analysis of construction reports, building construction project safety, health and environmental issues have become increasingly prominent, reduce or avoid course of construction, security incidents, quality accidents and protecting the safety of employees, health is present in the construction sector and the need to effectively address the main problem.
Preparation and Application of P-Mo-W Heteropoly Acid Catalyst
Authors: Deng Jun , Zhu Xue Jun , Xie Shuai
Published: November 2013

the phosphorus-molybdenum-tungsten heteropoly acid catalyst is prepared from such raw materials as phosphoric acid, sodium molybdate, sodium tungstate and characterized by infrared spectrum. Glyoxylic acid is prepared by catalytic oxidation of glyoxal in the presence of the self-prepared heteropoly acid catalyst and oxidizing agent hydrogen peroxide. The impact of catalytic reaction temperature, added catalyst, and use level of the hydrogen peroxide on the reaction for synthesizing the glyoxylic acid is investigated. The results show under such conditions as 4°C temperature, 0.15g catalyst, and 1.2:1 molar ratio of the hydrogen peroxide to the glyoxal, the phosphorus-molybdenum-tungsten heteropoly acid catalyst has higher catalytic activity and the mass fraction of the glyoxylic acid is 30%.
Effects of Multispecies Phytoremediation on the Fate of Phenanthrene and Pyrene in Soils
Authors: Pan Sheng Wang , Cao Sheng Xian , He Mao Ping , Yang Li Jian
Published: November 2013

The potentials of three plant species, rape, alfalfa and white clover, separately or jointly on the degradation of polycyclic aromatic hydrocarbons (PAHs) in soils were estimated by pots experiments. Results showed that the presence of vegetation apparently enhanced the dissipation of PAHs at initial concentrations ranging from 20.05 to 322.06 mg·kg-1, but the efficacy enhanced varied greatly among plant species and cropping patterns. Within 70-day experiment, alfalfa and white clover showed higher efficiencies for the removal of PAHs than those of rape, and mixed cropping greatly enhanced the dissipation of PAHs as compared to single cropping. On average 74.87% of phenanthrene or 62.81% of pyrene were removed from soils with mixed cropping of rape and alfalfa, and 72.01% of phenanthren or 68.44% of pyrene removed by mixed cropping of rape and white clover. Under similar pollution level, PAHs accumulated in plant, irrespective of root and shoot, was much lower in mutli-planted treatments than in mono-planted ones. Results suggested a feasibility of the establishment of multispecies remediation for enforcing the dissipation of PAHs, which may also decrease the accumulations of PAHs in plant and thus reduce their risks to humans.
A Review of Theoretical Research on Partial Parameters in Three-Phase Slurry Bubble Column Reactor
Authors: Li Yong Dan , Lu Su Min , Guan Qin Peng
Published: November 2013

Three-phase slurry bubble column reactor owns a wide application area. This review focuses on the hydrodynamics of the reactor from the findings of published studies, which includes the flow regimes, gas holdup, bubble size and distribution and mass transfer coefficients. The factors affecting each parameter and the status of the research are discussed, and the development of slurry bubble column reactor has also been prospected. At present, the experimental data that can be used in the industrial application is not accurate, an enlargement of the reactor is still a difficult problem, it remains to be further exploring in close to real environment.
A New Construction Process in Core Wall of High-Rise Building: Core Structure Succeeding Method
Authors: Joh Hyun Woo , Lim In Sig , Choi Yong Hwa , Shin Yoon Seok , Kim Gwang Hee
Published: November 2013

Of the construction processes involved in high-rise building construction, core wall construction is a highly repetitive construction works. Therefore, the effective management of core wall construction works by a project manager can save costs and shorten the duration of high-rise building construction. This study analyzes a case in which a core structure succeeding method (CSSM) is applied to core wall construction. The results of the case study found that the efficiency of CSSM in terms of construction costs and duration is higher than that of the core wall preceding construction method (CWPCM).
Kinetic Study on Photocatalytic Decolorization of Methyl Orange Aqueous Solution with KIO4 under UV Irradiation
Authors: Fang Hua , Wei Wu , Zhun Huang
Published: November 2013

It has been generally agreed that methyl orange (MO) can be effectively decolorized in KIO4 homogeneous reaction system under UV irradiation. The knowledge on the kinetics of the system possesses both practical and theoretical values. Decolorization efficiency of MO increases as the loading of KIO4 increases and has no an optimal amount of KIO4 in this case. The decolorization reaction manifests the first order with lower concentration and the zero order with higher concentration. As the initial concentration goes up, the order of the reaction is reduced from 1 to 0.
The Study on Soil Seed Bank in Different Urbanized Regions of Tianjin
Authors: He Meng Xuan , Li Hong Yuan , Mo Xun Qiang , Meng Wei Qing
Published: November 2013

In order to study the characteristic of soil seed band (SSB) in different urbanized regions of Tianjin, the research selected typical samples along urban districts, suburban districts, outer suburbs. After the germination tests, the results show that: from outer suburbs to urban districts,the density of SSB show an increasing trend, Sorensen Similarity Index show an increasing trend, but the specie richness show a decreasing trend. Suburban districts have the lowest Shannon-Wiener Index, Ecological Dominance Index, Pielou Evenness Index. Compared with outer suburbs, the species richness in urban districts and suburban districts have decreased 66.67% and 45.23%, urbanization promotes the homogenisation of species. Suburban districts have the highest density and species richness, the germinated seeds have large numbers of woody seedlings, so it can be considered for vegetation recovery.
Study on Dust-Retention Ability of Major Afforestation Tree Species in New Industrial Zone
Authors: Wang Fang , Xiong Shan Gao , Li Hong Yuan , Li Lan Lan , Zhang Qing Min , He Meng Xuan
Published: November 2013

Dust pollution has become one of the major problems that impact unban environment. While urban vegetation plays an important role in improving the urban atmospheric environment. This study conducted a preliminary research on the dust-retention ability of 20 greening tree species, by field sampling investigating and laboratory analyzing. The 20 greening tree species in Tianjin Airport Economic Area, a new industrial zone of Tianjin, were taken as research object. The results of the study show that: (1) the dust-retention ability of shrubs is bigger than arbors; (2) the dust-retention ability per unit area of different tree species varies; (3) Among Arbors, the order of the dust-retention ability is Populus tomentosa> Sophora japonica> Paulownia tomentosa> Firmiana simplex> Platanus orientalis> Robinia pseudoacacia> Koelreuteria paniculata> Salix matsudana > Fraxinus chinensis; (4) Among shrubs, the order is Syzygium aromaticum> Kerria japonica> Sorbaria sorbifolia> Ligustrum obtusifolium> Malus micromalus> Prunus cistena> Hibiscus syriacus> Prunus cerasifera var. pissardi> Prunus cistena> Lonicera maackii (Rupr.)Maxim.> Sambucus racemosa> Cercis chinensis. The research provides a theoretical basis for choosing the tree species in reducing the atmospheric particulate matter in Tianjin Airport Economic Area and the new industrial zone of northern China. In addition, the greening activity will be in favor of improving the ecological environment of the region.