bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Soil Deformation due to Pile Jacking in Saturated Soil
Authors: Wang Rui Cai , Shi Jian Yong , Zhu Ning
Published: December 2012

According to the theoretical formula of compacting displacement field due to jacked pile in semi-infinite soil, calculation of displacement field produced during construction process of precast pile was carried out. And the changing trends of radial displacement with depth of pile penetrating, the maximum radial displacement with normalized distance r/D and vertical surface displacement with normalized distance r/D were analyzed in this paper. Then the Comparison between theory calculation results and the field test data was presented. The results show that the theoretical formula will fit with the actual situation of the site, when the soft soil properties around the pile are homogeneous and saturated. The further solving of compacting displacement field due to pile jacking was put forward.
The Prediction Model of Foundation Settlement in Linear Loading Condition
Authors: Yang Hong Xia
Published: December 2012

Based on observation data about foundation settlement of Ji-He expressway in Shandong province,according to the theory of soil mechanics,deduced the prediction model of foundation settlement in linear loading condition.Verified its reliability combined with engineering example.Analyzed the influence factors of key parameters and the causes of errors in the model.The model can be used to estimate the foundation settlement and the process of settlement in the later period and after construction, control embankment filling and pavement construction progress. Providing the basis for evaluating the quality of highway construction and formulate the maintenance measures after construction.
Assessment of Liquid Saturations in Sand by Image Analysis
Authors: Sudsaeng Suwasan , Yimsiri Siam , Likitlersuang Suched
Published: December 2012

This research investigates the relationship between optical density and liquid saturations in unsaturated sand using multispectral image analysis technique. The tested liquids are water, diesel, and parafin liquid. The experiments are performed on two-fluid phase systems (water-air, diesel-air, and parafin liquid-air) and three-fluid phase systems (diesel-water-air and parafin liquid-water-air). Water is dyed with Brilliant Blue FCF, whereas diesel and parafin liquid are dyed with Red Sudan III. Using consumer-grade digital cameras, two images of sand specimens with various liquid saturations are taken with two different band-pass filters. The analysis results show that, for the sand and investigated fluids, the optical density defined for the reflected luminous intensity is a linear function of the degrees of fluid saturation for each spectral band and for any two- and three-fluid phase systems.
Effect of the Neighboring Loads on the Building Foundations
Authors: Yang Lin
Published: December 2012

When a new building or a heaped load is near to a existing building, the neighboring loads will cause the existing building foundations unevenly settle, tilt or even crack which will affect both the safety and normal use of the buildings. Therefore, it is necessary to strengthen the relate research in this area. In this paper, based on the Flemish theory the additional stress of the building foundation was deduced, and the soil settlement formula was calculated by the splitting summation method. The engineering example showed the influence of the neighboring loads on the existing building foundations.
Soil-Water Characteristics of Lime-Treated Expansive Clays in Hefei
Authors: Wang Ming Wu , Qin Shuai , Li Jian
Published: December 2012

Lime treatment technique is a convenient and common method used to improve expansive clays in engineering properties. The soil-water characteristic curve (SWCC) plays a role on engineering features of unsaturated lime-treated expansive clays. Herein, the soil-water characteristic tests by means of GDS and simulations were conducted to investigate the SWCCs of lime-treated expansive clays in Hefei. The results show that lime-treated expansive soil behaves hysteretic characteristics. Under the same value of suction, the higher cell pressure the larger the volumetric water content is. The numerical simulations from Fredlund model do good agreement with tests.
Study on Leakage Induced Settlement of the Adjacent Structures
Authors: Zhang Rui Mei , Cao Jing , Liang Bo , Zhao Hui Min
Published: December 2012

Field monitoring datum of a foundation pit are reviewed and analyzed to explain the settlement of adjacent structures. Settlements of adjacent structures induced by the water level fall are calculated through the principle of effective stress in saturated soil and the stratified summation method. The calculated settlement 31.93mm is close to the observed value 28.8mm. This confirms the effective stress increased by the leakage is the main cause of the settlement of adjacent structure.
Dynamic and Static Study on Bearing Capacity of Reinforced Mixing Pile Composite Foundation
Authors: Sheng Gui Lin , Zhang Ya Ge
Published: December 2012

The axial stress and axial displacement distribution curves of reinforced mixing single pile are researched by ANSYS software; and the differences of the single pile ultimate capacity of reinforced mixing pile between different core pile length and area replacing ratio are analyzed; It compared and analyzed envelope diagrams of bending moment and shear of reinforced mixing pile in different core pile length and area replacing ratio under seismic response. Some conclusions which may be of some value for design and construction of reinforced mixing pile composite foundation are drawn
Nonlinear FEM Simulation of Bottom Strengthened Concrete Filled Circular Steel Tubular Columns
Authors: Hui Cun , Cao Wan Lin , Dong Hong Ying
Published: December 2012

The structural measures about puting the additional energy dissipation plat at the bottom of the CFST columns where bears more stress, was proposed to improve the seismic energy dissipation performance of concrete filled circular steel tubular (CFST) columns. Selecting the axial compression ratio and height of the energy dissipation plate as parameters, finite element anylsis of 8 circular CFST columns with different structural measure were performed. On the basis of finite element anylasis results, this paper, which obtained load-displacement curves of each finite element model, analyzed and compared the bearing capacity of each model. The results show that: comparing to the ordinary circular CFST columns, the columns with energy dissipation plat show much better performence about bearing capacity and seismic capacity, the height of the energy dissipation has a great effect on bearing capacity but the bearing capacity is inversely proportional to the axial compression ratio.
Model Test Studies of the Vertical Bearing Behavior of Bored Piles with Breakage Defects
Authors: Wang Cheng Hua , Su Juan , Wang Gan
Published: December 2012

In order to study the vertical bearing behavior of bored piles with breakage defects, a series of methods for simulation of normal piles and broken piles in laboratory was developed and used to investigate the vertical bearing behavior of these piles. The load-settlement curves of normal piles and broken piles were measured and analyzed. The tests revealed that the upper part of a broken pile works alone as a short pile before it contact with the lower part of the pile at the end of the first sudden drop stage.The analysis of the test results showed that the position of the breakage defect has a great influence on the lost in vertical bearing capacity of the pile.
Optimization Design for Steel Structure Residence Based on the Sequential Quadratic Programming Method
Authors: Wu Xi Shuang , Liu Tie Lin , Chen Wen Bo
Published: December 2012

In order to reduce the steel consumption for one of the steel structure residence, a kind of effective approach of optimization design to the original design is given. In this paper, steel consumption of H-section steel beams are taken as objective function, which have relatively larger proportions than others. Design variables are the beam height, web thickness, flange width and flange thickness. The strength, stiffness and stability of the steel beam are taken as constraint condition under the relevant Building Code. By using the sequential quadratic programming method, we set up optimization mathematical model for optimizing the steel structure residence, and then obtain the optimal section size of the steel beams. After the structural optimization design, the steel consumption of GL1 was reduced by 8.24%, compared with those of the original design. Relative to the original design, optimized total steel consumption was reduced by 3.29%. The approach proposed in this paper is an effective method for the optimization design of steel structure residence.
Experimental Study on Reinforced Concrete Superposed Slabs
Authors: Liu Yun Lin , Yin Wan Yun , Wang Gang , Ding Ke Wei , Jin Ren Cai , Liu Shou Chen
Published: December 2012

With the improvement of the level of architectural science and technology and the modern development of the residential industry higher requirement on building materials and environmental protection was brought forward．Based on the static loading experiment of four reinforced concrete floor slabs, two ordinary and two superimposed with connections, the paper studied their loading mechanism and bending performance, such as deformation, cracks, bearing limit and fail characteristics. Finally, proposals for superimposed slabs' design were put forward, popularization and application of new composite wall plate provides realistic basis.
Mechanical Simulation of Reinforced Concrete Frame Structure
Authors: Jia Hui Na , Yue Gao Wei
Published: December 2012

In this paper the theoretical model of reinforced concrete frame structure is established to numerically simulate and analyze its overall morphology with the finite element analysis method. The calculation results shows that at the bottom of the structure the stress and deformation is much larger than other parts with the action of constant load, live load and wind load. And with modal analysis and buckling analysis natural frequency and vibration mode are obtained to avoid resonance and predict the buckling load.
Test Research and Analysis of Reinforced Inorganic Polymer Concrete Beam under Bending
Authors: Liu Hui Hong , Lu Zhean
Published: December 2012

The basic mechanical properties (tensile strength, compressive strength, elastic modulus, Poisson’s ratio) of inorganic polymer concrete were studied by test in this paper, which were compared with the performances of common concrete under same strength. According to the stress-strain full curve test results of inorganic polymer concrete under uniaxial compression, adopted the relational expression by the code for design of concrete structure, the equivalent uniaxial compression constitutive relation for inorganic polymer concrete could be got by correcting relevant parameter. The bearing capacity and deformation calculated by theoretical formula were compared with the test results. All of them are in good conformity.
Analysis on Dynamic Failure Behaviors of Steel Double-Layer Latticed Cylindrical Shells with Three Circle Centers Used in a Gymnasium
Authors: Wang Jun Gang , Li Hai Wang
Published: December 2012

In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer latticed cylindrical shells with three circle centers used in a gymnasium is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is complicated. Firstly the middle of the lower chord destroyed due to lack of tensile strength, then the stiffness of the integral structure degenerated, and ultimately lost its bearing capacity. Therefore, this structure has a high bearing capacity and good ductility.
Shape Determination of a New Double Inner and Outer Latticed Shell String Structure
Authors: Ma Guang Ying , Yao Yun Long , Dong Yu Meng
Published: December 2012

Double inner and outer latticed shell string structure is a new type of space structure. The new structural system is to reduce the space occupied by roof structure and could be laid by the rigid roofing material conveniently. Based on the local analysis method and the whole system balance, a numerical algorithm was introduced and some suggestions for improvement were put forward. An example was investigated and the results confirmed the feasibility of the proposed method.
Nonlinear Analysis of Steel and Concrete Composite Beams Strengthened with Prestressed FRP Bars
Authors: Yang Jia
Published: December 2012

Steel and concrete composite beam is a kind of composite beam which the steel and the concrete are connected by shear connectors. Now, many experts and scholars have carried out many experimental research and theoretical analysis about it. But, steel and concrete composite beams strengthened with prestressed FRP bars have not been studied. Based on the structure, the nonlinear analysis mode of steel and concrete composite beams strengthened with prestressed FRP bars is proposed, the calculating program is researched. The relationships between moment and curvature, also between load and deformation of steel and concrete composite beams strengthened with prestressed FRP bars are obtained. The results show that the moment-curvature curve and load-deformation curve of steel and concrete composite beams strengthened with prestressed FRP bars can be separated to elastic stage, elastic-plastic stage and plastic stage.
Mechanical Properties and Calculation Model of Eco-Composite Wall
Authors: Hou Li Na , Jing Gang
Published: December 2012

Eco-composite wall, as the main bearing member of the eco-composite wall structure, has unique structural characteristic compared with traditional wall. The constructional features, mechanical properties and collaborative performance of the wall are analyzed. Based on this, the three-stage mechanical model of eco-composite wall is put forward. The study results indicate that the eco-composite wall has unique structural characteristic, which makes the structure in possession of several seismic defending lines and have good seismic performance. The three-stage mechanical model is proved reasonable and applicable in structural design.
Practical Measurement for Steel Fiber Distribution of the SFRC Beams
Authors: Yang Chang Jing , Jin Li Bing , Chen De Cai , Qi Ji Peng
Published: December 2012

This paper introduces practical measurement of steel fiber distribution in steel fiber reinforced concrete (SFRC) which serves as the matrix of prestressed SFRC beams. Using digital image processing in mesos-copical mechanism of SFRC, “the Dynamic System of Measuring Steel Fiber Distribution” is developed. Compared with theoretical analysis, the system is practical and valid, and a new method is provided for guiding production technology of SFRC and controlling constructional quality.
Calculation of Ultimate Loads of Two-Way Reinforced Concrete Slabs
Authors: Wang Yong , Dong Yu Li
Published: December 2012

This paper presents the latest developments of a simple method used to determine the ultimate load of two-way simply supported reinforced concrete slabs. Based on the reinforcement ratio, two failure criteria are proposed in the paper. The effectiveness of the developed model is validated through satisfactory comparison with from test results.
Structural Design of Large Aperture Rectangular Mirror for Space Telescope
Authors: Li Zhi Lai
Published: December 2012

Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness, strength and thermal dimensional stability, some factors such as support scheme, materials selection, lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge, influences of gravity, assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5°C uniform temperature rise respectively, the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz, which shows an error less than 5% compared to FEA results.
Mechanical Performance of Beams Strengthened by Carbon Fiber Sheet Bonded with Inorganic Adhesive after Fire
Authors: Wan Fu Xiong , Zheng Wen Zhong
Published: December 2012

According to the fact that softening temperature of organic epoxy adhesive is too low to meet fire, an inorganic adhesive whose strength at 600°C is not lower than that at normal room temperature, is developed to bond Carbon Fiber Sheet (CFS) in order to strengthen reinforced concrete beams. To understand all-round mechanical performance of RC beams strengthened by CFS bonded by an inorganic adhesive after fire, on the base of experimental research, Conjugate Beam Method is used to analyze the whole mechanical process from loading to failure. The test and analysis results show that, for RC slabs strengthened by CFS bonding with the inorganic adhesive, maximum stress of CFS decreases with small amplitude compared with that before fire, and the strength of the sheet can be utilized to a great extent, even if temperature (about 300°C~470°C) an inorganic adhesive experienced outclasses softening temperatures of ordinary organic epoxy adhesives. Beams strengthened by CFS bonded with inorganic adhesive perform good fire behavior.
Durability Testing of the Existing Reinforced Concrete Structures
Authors: Han Jian Qiang , Dong Peng Cheng , Zhang Yan Rong
Published: December 2012

The ability to structure durability refers to the concrete structure in the natural environment, the role of the environment and material internal factors in the design requirements of the target period do not need to spend a lot of money reinforcement processing to maintain its safety, function and appearance requirements. . With the continuous development and transformation of China’s urban scale, a large number of existing structures by the post-test, further reinforcement of the design and reconstruction of this paper, the actual project to detect and evaluate the durability of reinforced concrete structures, reinforcement of existing buildings in the future and the transformation of the former’s identification with a certain reference value.
Selection and Arrangement Structure of the Point Support Glass Screen Wall
Authors: Meng Hui Ling , Si Li Xia
Published: December 2012

The selection and arrangement structure is the starting point of glass curtain wall building structure design. On the basis of the structural partition types, the paper discusses the various structural system which be used in engineering in detail. Especially introduces the reasonable layout of the beam system, truss system, framework, arch structure, space truss system, suspension system and so on. Finally, the basic principles and key points of the connection glass curtain wall system structure are also discussed in the paper.
Research to Enhance the Supporting Stiffness of Different U-Type Sheds
Authors: Zhao Yu Cheng , Lu Dan Feng , Zhen Ya Bin
Published: December 2012

With the increase of the mining depth, the surrounding rock of roadways shows the characteristics of soft rock that the stress increase, poor rock cementation, broken loose, a significant expansion, creep deformation, etc. Deep roadways mainly use the combination of active and passive supporting method, U-type shed is widely used in the roadway support and becomes gradually the main supporting form. This paper studies mechanical properties of different arched U- type sheds, then compares the stress distribution and the displacement change. According to the result of simulation and optimization, it is seen that the deformation trend is regular with the angle change, and when θ=30°, the U- type shed is better in the roadway support. The conclusion can provide some theoretical guidance for the deep or soft rock roadway support.
Influence of Shell Thickness on Axisymmetric Longitudinal Wave Propagation in Double Layered Hollow Cylindrical Shell Structure
Authors: Gao Kang Hua
Published: December 2012

Based on elastic wave theory, the characteristics for axisymmetric longitudinal wave propagation in double layered hollow cylindrical shell structure with a continuous contact interface are investigated. According to free boundary conditions and interfacial contact continuity condition, the first mode non-dimension dispersion equations for longitudinal wave is derived and validated by calculation data of existing literature. The non-dimension expressions of stress and displacement are deduced and the stress and displacement distribution in cylindrical shell are obtained by calculation examples. Under the fixed outside radius condition, the shell thickness influence on dispersion relation of axisymmetric longitudinal wave and stress and displacement fields in cylindrical shell are discussed. The results show that the thickness of inner shell or outer shell has little influence on dispersion characteristics when the value of wave number is small. As wave number increased, the effect of shell thickness also increased. The stress and displacement in shell increase with the increase of the thickness of inner or outer layer shell when the wave number value is large.
Experimental Study on Bearing Characteristics of the Pad and Chimney Foundation in Salt Lake Area
Authors: Man Yin , Lu Xian Long , Zheng Wei Feng
Published: December 2012

Transmission line foundation engineering inevitably encounters the special geological conditions in salt lake area, such as strong corrosion of saline soil, weakness of foundation soil and high water table of groundwater. In-situ tests on bearing characteristics of the selected pad and chimney foundation were conducted. Ultimate uplift bearing capacity and ultimate compressive bearing capacity of the pad and chimney foundation in salt lake are obtained, which can verify the rationality and reliability for its engineering popularization.
Environmental Implications of Traffic Flow Delays: A Model for Urban Streets
Authors: Corriere Ferdinando , Peri Giorgia , La Rocca Vincenzo , Rizzo Gianfranco
Published: December 2012

In this paper the problem of road's capacity is dealt in presence of perturbations of the vehicular flow. In particular, among the different disturbing causes, it is here considered the presence of vehicles parked along the road in relation to their parking activity. Having already established the delay, caused by those vehicles leaving their stationary positions and entering the traffic flow or by those who slow down the flow to park, it is possible to evaluate the changes in time running values. Related to these times delay, the extra pollutant emissions by a given urban running fleet is also evaluated, by utilizing emission factors depending on age, type, volume capacity and engine of the vehicles.
Evaluation on Circular Economy Development in Provincial Region-Based on Eco-Efficiency Perspective
Authors: Cui Mu Hua
Published: December 2012

The core of eco-efficiency is to make maximum use of resources to increase the value of products or services, and to reduce the hazard to the environment as far as possible. The essence of circular economy is to improve eco-efficiency. With reference to related eco-efficiency research at home and abroad, to assess circular economy in provincial region, an eco-efficiency index system is constructed in this paper, linear weighted method is applied to evaluate eco-efficiency of circular economy of central six provinces in 2010. According to the results, the rank of circular economy development level is given in six provinces. Aiming at the shortages of eco-efficiency and developing circular economy, some corresponding policies and suggestions are put forward in six provinces.
GIS-Based Alerting and Control System Design of Geological Disaster in Jiangxi Province
Authors: Zu Xiao Fang , Luo Xian Gang , Luo Jin
Published: December 2012

This paper combines the management and prevention of geological disasters through network technology to design the management and prevention platform of geological disasters in Jiangxi Province, which achieves the electronization of the organizational structure and workflow of geological disasters prevention and control on the Internet. This platform breaks the limitations of time, space and departmental separation and promotes geological disaster prevention and management to the level of continuous accumulation, scientific management and rational utilization. Also, Geological disaster prevention and control enters a healthy circulation of dynamic assessment, rapid response, remote consultation and emergency command. The system provides all-rounded high quality, transparent and efficient Web service of geological disaster Alerting, prediction, prevention and management information, achieving the purpose of improving the efficiency and quality of geological disaster prevention and management.
Research on Environment Geology Information System Based on GIS
Authors: Luo Jin
Published: December 2012

With the specific cases, this paper summarizes the general process, target, framework, database logical and physical structure and various application function of environment geology information system based on GIS, in order to provide some reference for the construction of relevant system.
Performance Enhancement of Phase Change Thermal Energy Storage Unit Using Fin and Copper Foam
Authors: Xie Yong Qi , Song Jun , Chi Peng Tao , Yu Jian Zu
Published: December 2012

An experimental study has been carried out to evaluate how fin and copper foam enhance the heat transfer performance of phase change thermal energy storage unit. The thickness of fins is 0.8mm, the porosity of the copper foam is 96% and the phase change material (PCM) is 99% pure eicosane. The samples with fin, copper foam and paraffin (FCFP) or with single copper foam and paraffin (CFP) were processed and their response to temperature variations were tested for vertical placement and horizontal placement under different heat flux conditions. The experimental results show that the use of fin and copper foam can make the sample melt much faster than single copper foam and the effective thermal conductivity of the FCFP composite is 10.83 W/(m∙K), which is 2.7 times as that of the CFP composite. In addition, horizontal placement is more contributive to the heat transfer than vertical placement for high thermal conductivity composite.
Impact Analysis to Building Energy Consumption of Daylighting Combined Lighting Control
Authors: Li Xiao Lei , Li Huan , Gao Jian Ping
Published: December 2012

A study on the building energy consumption analysis of daylighting-based lighting control strategy was carried out. A circle type of building was mainly simulated by using the eQUEST energy simulating software. By setting various window-wall ratios, we try to find the relationship between the energy saved by daylighting-based lighting control and the other main energy consumptions, such as the cooling and heating energies. The data shows that the energy saving potential of daylighting-based lighting control strategy can be 40% under the proper window-wall ratio, and in the meanwhile, the total energy saving of the whole building can be 8%. A formula is given to get the best window-wall ratio of various cities according to its geographical information and local climate factors.
A New Real Time Forecasting Model for Wind Power
Authors: Xu Song , Chen Shou Lun
Published: December 2012

Wind power is the most large-scale development of technical and economic conditions of non-hydro renewable energy. The real time forecasting for wind power is difficult because of the wind power data has nonlinear interaction. A new real time forecasting model for wind power is established. In the model, state space reconstruction is used to transfer the original wind power time series to high dimension space. The input vector and anticipant output vector can be gained by the changed data in the high dimension space. Based on the theory of support vector machine, the real time forecasting model is established with the principle of structural risk minimization of support vector machine. The new model is used for the real time forecasting of wind power. The results prove the efficiency and validity of the new model.
The Security Strategy for Chinese Petroleum Industry
Authors: Dong Shi Bao , Li Xuan Min , Su Meng
Published: December 2012

This paper discusses how to ensure the security of Chinese petroleum industry, i.e. setting up supervision mechanism for the petroleum industry by rules and regulations; exploring and excavating domestic oil resources; saving oil resources; enlarging oil reserve and importing oil from other countries by diplomatic efforts.
Design Study of Small Pb-Bi Cooled Non-Refueling Nuclear Power Reactors (SPINNORs)
Authors: Su’ud Zaki
Published: December 2012

Small Pb-Bi Cooled Non-refueling Nuclear Power Reactors(SPINNORs) are small lead-bismuth cooled nuclear power reactors with fast neutron spectrum that could be operated for 20 years without on-site refuelling. In this study the results of neutronic design for 62.5-250MWt NPPs are discussed. The reactor cores are designed to have near zero (less then one effective delayed neutron fraction) burn-up reactivity swing during the burn-up period to avoid a possibility of super-prompt critical accident. The basic concept is that the reactor core is adjusted so that its internal conversion ratio is nearly one. During the reactor operation fissile material accumulates in this central region, which helps to compensate fissile material loss in the peripheral core region and also contributes to negative coolant loss reactivity effect. In general higher fuel volume fraction is needed for smaller core.
The Research of Induction Motor Vector Control System Based on Fuzzy Self-Adaptive Pi Complex Control Algorithm
Authors: Wang Wei , Sun Xia , Li Bao Yin
Published: December 2012

According to disadvantages that traditional PID control is difficult to adjust PID parameter for nonlinear and time-variant induction motor speed control system, this paper designs fuzzy self-adaptive PI speed control system with Double Closed-Loop Fuzzy Controller by combining fuzzy control and PID control. The MATLAB simulation results show that this controller has better stability and self-adaptive property and well improved the dynamic performance of the system compared with conational controller.
Indoor Air Quality Audit and Grey Incidence Analysis of an Air-Conditioned Institutional Library in the Subtropics
Authors: Liu Li Ru , Wu Jun , Wang Xiao Xia , Li Zhi Sheng , Cheng Tian
Published: December 2012

The IAQ characteristics, both in terms of empirical objective measurements and subjective responses, are presented for an air-conditioned institutional library in subtropical climate. The objective measurements involve the measurement of physical parameters of the air dry bulb temperature, relative humidity, air velocity and the monitoring of the concentrations of selected chemical indicators of carbon dioxide, carbon monoxide, formaldehyde. The occupants' subjective sensation to IAQ is surveyed in terms of unacceptability. By calculating the relation degree between the subjective unacceptability and objective measurements with the grey incidence analysis method, the occupants' subjective sensation to IAQ is linked with the objective measured parameters and their relation is explored.
Design Optimization of SS-AlN Cermet Solar Selective Coatings
Authors: Liu Xin Yue , Tang Run Sheng
Published: December 2012

In this work, effect of the number of stainless steel-aluminum nitride (SS-AlN) cermet layers and stainless steel (SS) volume fraction in each of cermets on the optical properties of SS-AlN solar selective coatings was theoretically investigated based on the effective medium theory and optical properties of SS and ceramic AlN. Results shows that increasing the number of cermets does not improve the optical performance of solar selective coatings in terms of solar absorptance and thermal emittance at 80 oC, and the two-cermet-layer structure, one having a high metal volume fraction (HMVF) and other having a low metal volume fraction (LMVF), is the most suitable due to better optical performance and easier preparation. Theoretical results also shows that, for double SS-AlN cermets structure selective coatings, optimized LMVF and HMVF are 0.35 and 0.6, respectively, optimized thickness of cermets with LMVF and HMVF are 50 and 60 nm, respectively, and optimized thickness of AlN anti-reflection film is about 60 nm. Comparisons of reflectance of a sample deposited by a pulse magnetron sputtering coater between measured and calculated showed that theoretically predicted reflectance were highly agreed with those experimentally measured, indicating that the theoretical method used in this work can pretty predict the optical properties of SS-AlN cermet solar selective coatings.
Research of Setting Main Circuit Parameters of Independent Photovoltaic Power System
Authors: Zhang Fei , Fu Jiao , Jia Hua , Li Jie
Published: December 2012

Inductance capacitance parameters value of main circuit devices of independent photovoltaic power system influence stability of system. In this paper, selection the suitable transistors, using a variety of algorithms to match the parameters value of capacitance, inductance. PSIM software was used to carry out modeling for photovoltaic cells, lead-acid battery, electrombile. Simulation of buck and boost DC/DC circuits, through analyzing time-domain waveform, verifys feasibility of design scheme, correctness of the algorithms. These algorithms provide a the oretical basis of main circuit setting of independent photovoltaic power system.
Stability Evaluation for Polymer Electrolyte Membrane Eletrolyzer
Authors: Kim Hong Gun , Shin Hee Jae , Cha Yun Ju , Ko Sun Ho , Kim Hyun Woo , Kwac Lee Ku
Published: December 2012

Recently, polymer electrolyte membrane (PEM) electrolyzers consist of the layered structure of membrane and electrode assembly (MEA), titanium flow field plate, gasket, end plate, and others. Among these components, MEA and titanium flow field plate take account for most of the device cost. The cost and time for manufacturing device can be reduced with the gasket-integrated 3-D mesh-applied PEM electrolyzer (Fig. 3), while maintaining the same performance as that of the existing titanium flow field plate devices. The 3-D mesh is found to perform the roles of the existing flow plate which ensures the smooth fluid flow and uniform power supply. The voltage shows 19.3V at current density (0.5 A/cm2), a little lower than 19.6V that is 10 times of 1.96V which is the average cell voltage at the same current density. In addition, hydrogen production and stability for performance are equal to or higher than that of the device for titanium flow field plate.
Degradation of 2-Chlorophenol Using a Pd/MWNTs Gas Diffusion Electrode in the Divided Cell
Authors: Zeng Zhi Peng , Wang Hui , Bian Zhao Yong , Pang Lei
Published: December 2012

In a diaphragm electrolyze system with a Ti/RuO2/IrO2 anode and the Pd/MWNTs gas diffusion cathode, the degradation of 2-chlorophenol was fully studied by the electrochemical reduction and the simultaneous oxidation of the cathode and anode. The results indicated that the Cl- removal reached 90.5% after 80 min electrolysis with H2 feeding. After 120 min electrolysis, the removal of 2-chlorophenol in the anodic and cathode compartments were 88.8% and 98.5%, respectively. Additionally, the TOC removal reached 75% and 85.6% in the anodic and cathodic compartment respectively after 140 min. By the UV scanner analysis of the electrolyte, the 4-chlorophenol and benzoquinone were oxidized by the oxides formed on the cathode, while the benzoquinone was found accumulated in the anodic compartment. Based on the analysis of electrolysis intermediates using high performance liquid chromatography (HPLC) and ion chromatography (IC), the electrolysis degradation of 2-chlorophenol was proposed containing the intermediates, such as phenol, hydroquinone, benzoquinone, maleic acid, fumaric acid, succinic acid, malonic acid, oxalic acid, acetic acid and formic acid.
The Use of FT-IR for the Determination of Liquid Products Properties after the Tyres Thermal Degradation
Authors: Sassmanová Veronika , Poláčková Zuzana , Frantík Jaroslav , Honus Stanislav , Juchelková Dagmar
Published: December 2012

The article deals with the identification of a chemical structure of pyrolysis liquid occurring by the thermal degradation of tyre debris within the temperature interval from 500°C to 650°C and the temperature increase steps of 50°C in individual experiments and with the use of analytical methods GC/MS, FT-IR and the elementary analysis. The measured FT-IR spectra indicate the representation of functional groups included in measured samples. They could be used for the determination of basic chemical properties. There were changes in the chemical composition monitored as well as the creation of functional groups in the pyrolysis liquid on the basis of FT-IR spectra and GS/MS outcomes.
The Role of Vernacular Architecture in Design of Green Sidewalk (Case Study: Iran, Shushtar)
Authors: Mahdavinejad Mohammadjavad , Ghaedi Abdolkarim , Ghasempourabadi Mohammadhossein , Ghaedi Hojat
Published: December 2012

The vernacular architecture around the world, have considered many methods for creating better living conditions and welfare measures. Although it was difficult to work in harmony with cruel nature but wherever there is possibility of its use, the vernacular architecture takes advantage of nature. In Iran’s sustainable architecture there are much evidence of Persian architect’s genius and creativity in using nature to their advantage as: Wind catcher in hot and dry areas, Water storage scattered in many parts of Iran, The Yakhchal in depths of land for conservation and preservation of ice and their use in summer. Among them “Kat”, which is specialized in Dezfol and Shushtar of south-west of Iran, was made with certain conditions. In this paper, we studied on how to use “Kat” functional features in modern use in designing green Sidewalk. Based on these functions, a model for Sidewalk was created which will have a thermotical effect in Sidewalk. This model will keep the temperature over Sidewalk 4-5 degree less than other routes in summer.
Analysis of Water Quality Change before and after the Wenchuan Earthquake
Authors: Qian Feng , Hu Bo , Liu Jing Jun , Xiong Ming Biao , Hu Heng
Published: December 2012

“5.12 Wenchuan earthquake”triggered floods, landslide, collapse and secondary geological disaster, trigger a new soil and water loss, having the significant influence to the local river water quality.This article through the statistical analysis of minjiang river and jiangyou wenchuan, beichuan station 2006 ~ 2011 water conditions material, discussing the before and after the earthquake disaster areas of river water quality change characteristics. The results showed that the affected areas of ammonia nitrogen content after the earthquake are more than before the earthquake content .The fluoride content before earthquake overtop that after earthquake in Wenchuan water source .The total hardness of water quality presents upward trend in disaster area after earthquake, and the total hardness of water quality in 2010 and 2011 is greater then that before earthquake. The total iron content is not affected by the earthquake, before and after the earthquake did not appear obvious difference.
Debris Flow Warning System Design by Diao Zhongba on the Basis of GIS
Authors: Li Xue Ping , Li Yu Nan
Published: December 2012

Aiming at guaranteeing the security of Zhong Ba village, reducing investment capital and preventing geological disasters, it is necessary to design debris flow alarming system in Diao Zhongba. Being a basic platform, geographic information system software MAPGIS is fully taken advantage for managing engineering geology information in Diao Zhongba. Then research on secondary development library based on MAPGIS is conducted for achieving debris flow alarming function. Detailed design of debris flow alarming system in Diao Zhongba district is made on systematic requirement analyses, systematic overall design, system environment selection, data base detailed design and module design on alarming function. The system designs 10 kinds of models in all which includes flood peak flow computation model of dam breaking and flood peak evolution process model of dam burst. The system can conduct an automate information process on debris flow with which serves as the references for debris flow alarming in Diao Zhongba district.
Research on the Residential Environment Construction of Healthy City
Authors: Wang Dong Zhou
Published: December 2012

Healthy city is the target of city development, this paper firstly analyzes the construction of healthy city environment factors and their impact on the health of residents, and then explore the causes of constraints these environmental element constructions.Based on this analysis, it proposed the construction of healthy city should change the mode of economic development, increase the city green space construction, improve residents' health consciousness and strengthen the environmental legislation, the reasonable layout of city public space and function, providing a good living environment to residents.
Effects of Soil Amendment Fertilizer on Cotton Growth and Yield
Authors: Du Jian , Du Xuan , Li Yu Mei , Jian Jin Shi , Du Can
Published: December 2012

As new approaches to comprehensively utilize urban-rural wastes, waste resources and straws of wheat, maize, cotton, rice, rape and etc. (as principal raw material) were used to prepare environment-friendly products(soil amendment fertilizer) for water-saving agriculture (the processing techniques were established).In this paper, the cotton growth and yield were studied under the application of water-saving products(soil amendment fertilizer). Results show: for all prescriptions, under the application amount of 750kg/hm2 (equivalent to regular fertilization and investment), the fresh and dry weight in cotton seedling stage increased by 10-20% over control and the prehot seasonal boll increased by 2.0-2.54/plant compared with control respectively; the yield under all prescriptions increased over control with an increasing range of 4.70-14.25%; the quarterly irrigation can be decreased by 1-2 times(saving irrigation amount of 600-1200m3 /hm2).The above results show that soil amendment fertilizer can not only conserve moisture, but also increase soil fertility, promote cotton seedling growth and increase dry matter accumulation.
The Influences of Industry Development on the Urban Environment in Beijing, China
Authors: Wang Kai Yong , Deng Yu
Published: December 2012

Based on the statistical analysis and on-site interviews, this paper combines to assess the effects of industrial location, industry mix, industry ownership, and environmental policies on urban pollution levels in Beijing, China. A regression model relates these variables to an index of overall environmental quality for Beijing city. Shift-share analysis is used to determine the direction of recent sectoral shifts, and interviews and anecdotal evidence provide a broader context for our conclusions. We found that industry type, ownership and size significantly affect urban pollution levels. We conclude that although local enforcement of environmental regulations in Beijing has been effective, at the national level it is still inadequate. Finally, we recommend that policies calling for a reduction in the role state-owned and certain small-scale industries be incorporated into the larger economic goals of the central government.
Characterization and Identification of Inorganic Water-Soluble Ions in PM2.5
Authors: Dai Wei , Gao Jia Qi , Wang Bo , Ouyang Feng
Published: December 2012

PM2.5and ionic components have been measured from summer 2009 to winter 2010 in the suburb of Shenzhen. Serious PM2.5 pollution was observed, especially in winter. SO42-, NO3- and NH4+ in winter were the predominant ions in PM2.5. In summer, the mean contributions of SO42-, NO3-and NH4+ to PM2.5 decreased, while the contributions of Cl- and metal ions increased significantly. Furthermore, ion balance, ratio analysis and correlation analysis were conducted to identify the sources of ions in PM2.5.
The Relationship between Ecosystem Health and Ecological Safety
Authors: Song Ying , Chang Rui Ying , Yu Zheng Da , Wang Ren Qing , Liu Jian
Published: December 2012

With the rapid economic development and the highlighting environmental issues, more attention has been paid to ecosystem health and ecological safety. Along with the development of the concept of sustainable development, people gradually realized the importance of natural ecosystems. Ecological safety is the basis of sustainable development. It is a necessary condition to build a harmonious and environment friendly society. A healthy ecosystem is the basic guarantee of the realization of human social and economic development. This paper analyzes the relationship between ecosystem health and ecological safety, and finds that there are many connections and differences between them.According to the comparison of indices in the same evaluation model, the differences are analyzed. The paper helps to avoid the confusion between this two terms, and aims to make the goal of environmental management clear.
Estimation of Effect of Technogenic Discharges on Hydrosphere in Dalnegorsk District of the Far East
Authors: Zvereva V.P. , Krupskaya L.T. , Salyukova E.N.
Published: December 2012

Mining industry in Dalnegorsk District has been developing for more than a hundred of years. This produced a mining technogenic system with the pronounced negative action on the ecosphere. As a result, the surface and ground waters are polluted with toxic elements Zn, Pb, As, B, Fe, and others. Their content in most of hydrochemical samples is significantly higher than the background parameters and limitedly permissible concentrations. The study district is characterized by the crisis ecological situation. The measures on the recultivation of the old tailing dumps of CRP, KRP, and OJSC «Bor» should be executed in the nearest future.