摘要:
In this paper, based on box dimension algorithm ideological and digital image technology, The relationship between the digital image pixel matrix and graphics as well as between the graphical extraction method how to obtain a concrete cracks graph by fractal image binarization is given. Designed to calculate the two-dimensional digital image of concrete crack box dimension based on Matlab program. Between the internal laws of the dynamic load in accordance with this method can easily solve the shock box dimension of the specimen surface cracks in concrete under load, with good usability, to study the fractal characteristics of the concrete surface cracks and its very important to bear significance.
作者机构:
[Zeng, Sheng; Zhang, Jing; Wang, Shaoping] Univ South China, Inst Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.;[Sun, Bing] Univ South China, Inst Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称:
International Conference on Architecture and Civil Engineering (ICACE)
会议时间:
MAR 19-20, 2016
会议地点:
Changsha, PEOPLES R CHINA
会议主办单位:
[Zeng, Sheng;Wang, Shaoping;Zhang, Jing] Univ South China, Inst Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.^[Sun, Bing] Univ South China, Inst Urban Construct, Hengyang 421001, Hunan, Peoples R China.
关键词:
Bolt Nondestructive Testing;Dynamic Testing Signals;Time-Frequency Analysis;Short Time Fourier Transformation
摘要:
This research mainly studies the signal characteristics of different anchoring quality. Our study has made three different anchoring quality anchors of the complete, the empty slurry and the empty slurry with different density. We used stress wave reflection to analyze the measured curve by time domain analysis. According to the change of short time Fourier transformation, the dynamic signal of the anchor bolts is analyzed by the frequency domain. The analysis results show that the three kinds of anchors are all with the signal which the fixed end reflection is very strong while the bottom reflection is weak. The integrated anchor signal has a strong periodicity, a relatively concentrated frequency band, a regularly stress wave propagation. But the defective one is opposite.
作者机构:
[Song, Xue; Shi, Jianjun; Chen, Zhaoyu; Song, X] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
会议名称:
International Conference on Architectural, Civil and Hydraulics Engineering (ICACHE)
会议时间:
NOV 28-29, 2015
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Song, Xue;Shi, Jianjun;Chen, Zhaoyu] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
Waste cathode ray tube glass;Alkali-aggregate reaction;Accelerated Mortar Bar Test;Fly ash
摘要:
With finely ground waste cathode ray tube glass sand, respectively replace 20%, 40%, 60% the proportion of ordinary sand in mortar, fly ash as mineral admixture in 0%, 10%, 20%, 30% the proportion of replacing cement. A total of 12 sets of mortar specimens were prepared. Use Accelerated Mortar Bar Test (ASTM1260) to measure mortar specimens alkali aggregate reaction expansion at 3D, 7D, 14D, 28D. The results show that: CRT glass is an alkali active substance, expansion will become larger with the increase of CRT glass content in the mortar specimen. Fly ash can restrain CRT glass mortar ASR expansion, all adding fly ash specimens 14D expansion rate is less than 0.1%, the swelling degree of restraint increases with the fly ash, ash up to 20% when we have been able to significantly restrain the expansion.
摘要:
The contamination of soils with heavy metals has become a major environmental concern. Extractive-decontamination of the toxic metals (Pb, Cd and Cu) from the contaminated soil using N(2)EDTA and STPP was evaluated by batch extraction. The influences of mixed liquid concentrations, oscillating time, pH of solutions on leaching efficiency were investigated. Pb, Cd and Cu fractions characteristics were compared before and after leaching to reveal the leaching of them. The extraction efficiencies increased in the order of Pb > Cd > Cu for Na(2)EDTA, and Cd > Pb > Cu for STPP. Na2EDTA and STPP can coordinate with metal ions in the soil, but the complexing ability of STPP is relatively weak. Synergistic effects on metal leaching with contaminated soil were observed in low solution. However, antagonistic effects on metal leaching were found at higher than 0.01 mol/L. The heavy metal removal efficiency from soil increases with concentrations of mixed solutions and leching time. Metal fractionation analysis showed that the leaching metal was mainly from acid exchangeable, reduction state, oxidation state, while residual state metals were almost unchanged.
作者机构:
[Qi, Chunming; Lei, Xiaolin; Gao, Jie] Univ South China, Coll Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称:
6th International Conference on Manufacturing Science and Engineering (ICMSE)
会议时间:
NOV 28-29, 2015
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Gao, Jie;Qi, Chunming;Lei, Xiaolin] Univ South China, Coll Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
cloud model;game theory;combination weighting;the slope stability;degree of certaint
摘要:
According to the characteristics of the inevitable fuzziness and andomness in the slope stability evaluation, we proposed the model of rock slope stability evaluation based on cloud model, combined the combination weighting game theory considering subjective and objective weight, evaluate the slope instances. The comprehensive cloud of each factor on each stability level has been generated based on 7 indexes and evaluation standard. According the actual slope data, the degree of certainty for each slope on each stability level can be obtained. Finally, the maximum degree of certainty determined the slope stability level. Comparing the cloud model method with the grey correlation analysis and extension evaluation, proved that this evaluation result is reliable, the method is feasible and effective.
摘要:
The flow fields of single airfoil model and symmetry airfoil model were simulated by CFD software in this paper. the different inducing velocity and the airfoil intervals were considered to study the flow field and the induction rate change of the models. The results show that the induction rates of the single airfoil model and the symmetry airfoil model enlarge when the inducing velocity increases, and gradually reaching a steady value. As interval of the symmetry airfoil model is increased, the induction rate increases. The air flow from the narrow slits of symmetry model can be mixed and disturbed each other. Therefore, the induction rate of symmetry airfoil model is not a simple superposition of the single airfoil model under the same inducing velocity. Induction rate and airfoil interval are the key factors to optimize the airfoil model.
作者机构:
[Tao, Wang; Gan, Yuan-Chu; Ke, Guo-Jun] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称:
5th International Conference on Civil Engineering and Transportation (ICCET)
会议时间:
NOV 28-29, 2015
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Tao, Wang;Ke, Guo-Jun;Gan, Yuan-Chu] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
Waste glass concrete;Stress-strain full curve;Best color waste glass powder
摘要:
Design level C30, Water cement ratio 0.5, Sand rate 36%, Glass powder content 15%, Glass particle size by milling 35min, Waste glass powder mixed with two kinds of color, brown and green. Plus a baseline group of three groups and each group of six, a total of eighteen. Strain gauge affixed to the sides of the prismatic concrete test block stress - strain full curve.
会议名称:
International Conference on Modeling, Simulation and Optimization Technologies and Applications (MSOTA)
会议时间:
DEC 18-19, 2016
会议地点:
Xiamen, PEOPLES R CHINA
会议主办单位:
[Ye, Yaling;Peng, Xiaoyong;Zhang, Yuan;Wei, Hu] Univ South China, Urban Sch Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
ACSR-Advances in Comptuer Science Research
关键词:
coanda effect;numerical simulation;inducing velocity;ventilation fan
摘要:
The airfoil ventilation fan based on Coanda effect was studied, which was simulated by Fluent software. The inducing velocity was considered as an important influence factor on the characteristic of t
作者机构:
[Long, Wen-Wu] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称:
International Conference on Material Science and Application (ICMSA)
会议时间:
JUN 13-14, 2015
会议地点:
Suzhou, PEOPLES R CHINA
会议主办单位:
[Long, Wen-Wu] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
APR
关键词:
Foam Concrete;Dry Density;Moisture Content;Compressive Strength;The Drying Temperature
摘要:
Influences of curing period and dry density on Moisture content and compressive strength were investigated through eight different densities of foamed concrete be in 650 kg/m(3) to 850 kg/m(3). The research results show that foam concrete in same age stages with increasing dry density, compressive strength increased, while reducing the moisture content; With an increase in the dry density grade, the compressive strength was significantly enhanced; the relation between the foam concrete compressive strength and moisture content reached 0.9939.
会议名称:
9th International Symposium on Heating Ventilation and Air Conditioning ISHVAC Joint with the 3rd International Conference on Building Energy and Environment COBEE
关键词:
Coupled heat and moisture transfer;Optimum insulation thickness;Lifecycle total cost;Lifecycle saving;Payback period
摘要:
Thermal insulation plays an important role in achieving building efficiency. Many engineering investigations were carried out to determine the optimum insulation thickness. In this paper, a coupled heat and moisture transfer model is presented to calculate the annual energy consumption. Then, the lifecycle total cost is analyzed by the P1-P2 economic model. Based on lifecycle total cost analysis, the optimum insulation thickness is determined. Three representative cities, viz. Changsha, Chengdu and Shaoguan, are chosen as the sample cities. The optimum insulation thickness, lifecycle saving and payback period are estimated. The results show that the optimum thickness of extruded polystyrene (XPS) is between 0.053 and 0.069m and the optimum thickness of expanded polystyrene (EPS) is between 0.081 and 0.105m. The maximum lifecycle saving varies from 16.60 to 28.50$/m2 and the payback period varies from 1.89 to 2.56 years. EPS is more economical than XPS as insulation because of its lower lifecycle total cost. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
作者机构:
[Zhang, Qiuyang; Zhang, Haifeng; Sun, Bing] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.;[Zeng, Sheng] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
会议名称:
International Conference on Advances in Energy, Environment and Chemical Engineering (AEECE)
会议时间:
SEP 26-27, 2015
会议地点:
Changsha, PEOPLES R CHINA
会议主办单位:
[Sun, Bing;Zhang, Haifeng;Zhang, Qiuyang] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.^[Zeng, Sheng] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
rock mechanics;crossover jointed rock;uniaxial compression;numerical simulation
摘要:
The rock structure is extremely complex, it is difficult to reflect the mechanical properties and the relevant failure mechanisms truly under loads whatever by the theoretical analysis or the laboratory test. In order to analyze the damage characteristics of the crossover jointed rock mass from the microscopic point, the discrete method PFC2D was used to simulate the damage mechanism in the assured jointed rock numerically under Axial compression. The results show that when the angle of the main joint is consistent with the direction of the load, the varying angle between the minor joint and the main joint has rarely influence on the stress-strain curve of the rock mass, the stress when the first fine crack comes up and the peak; when the angle between the minor joint and the main joint is not changing, the peak value gradually reduces as the direction angle between the main joint and the load varying from 0 degrees to 90 degrees; when the peak comes up, the direction angle between the main joint and the load is 45 degrees or 90 degrees, the varying angle between the minor joint and the main joint has rarely influence on the development of the number of new fine cracks, while the angle between the main crack and the load is 0 degrees, the impact on the development of the number of new fine cracks is obvious.
关键词:
Shewanella oneidensis;U(VI);mechanism;infrared spectroscopy;scanning electron microscopy;energy dispersive spectrometer
摘要:
In order to realize the process mechanism that Shewanella oneidensis(S. oneidensis) reduced uranium(VI), and improve its reduction effect, the reduction mechanisms of uranium with S. oneidensis were studied by FTIR, SEM, EDS. The results show that after the S. oneidensis reduction of U(VI), the cell surface morphology is changed, the gaps and caverns on S. oneidensis surface decrease and more uncrystalmini grains through electron appear, which are binding each other. Much of new crystal structures were generated on the surface of cell. K+ and PO43+ were involved in the process of U(VI) reduction. FT IR spectra analysis indicated that the main groups of S. oneidensis were association of hydroxyl, phenolic hydroxyl, amidogent, halogenated hydrocarbon, carboxyl in the process of U (VI) reduction.
作者机构:
[Yi, Xin; Mi, BingJie] Univ South China, Sch Urban Construct, Hengyang, Peoples R China.;[Hu, Heping; Guo, Changqing] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
会议名称:
4th International Conference on Computer, Mechatronics, Control and Electronic Engineering (ICCMCEE)
会议时间:
SEP 28-29, 2015
会议地点:
Hangzhou, PEOPLES R CHINA
会议主办单位:
[Yi, Xin;Mi, BingJie] Univ South China, Sch Urban Construct, Hengyang, Peoples R China.^[Hu, Heping;Guo, Changqing] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
Steel high strength concrete column;seismic performance;axial compression ratio;stirrup ratio;steel ratio;finite element analysis
摘要:
In the thesis, simulated analysis of eight steel reinforced high strength concrete column under the low reversed cyclic horizontal load were performed by using the nonlinear finite element software of ABAQUS. The hysteresis behavior, skeleton curve, displacement ductility energy-dissipating capacity of the steel reinforced concrete column under the combined action of the bending, pressing, and shearing were discussed in this thesis. And it also analyzed factors that affect the bearing capacity and ductility of the steel reinforced column, such as axial compression ratio, stirrup ratio, steel ratio. Results indicate that the displacement ductility factor between 2.43 and 3.95; The stirrup ratio have a greater impact on the seismic performance of steel reinforced high strength concrete columns. With the increment of volume-stirrup ratio and steel ratio, the ductility factor increases; As The axial compression ratio increased, bearing capacity increased correspondingly; When steel reinforced concrete column are under higher axial pressure, stirrup ratio has more significant effect on the bearing capacity of structure.
作者:
Rong, L. S.*;Yang, R. L.;Dong, C. Q.;Zhao, C.;Yan, Z.;...
作者机构:
[Dong, C. Q.; Xie, S. B.; Zhao, C.; Rong, L. S.; Yang, R. L.] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang, Peoples R China.;[Xie, S. B.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang, Peoples R China.;[Yan, Z.] Huda Technol & Educ Dev Co Ltd, Changsha, Hunan, Peoples R China.
会议名称:
International Conference on Computer Science and Environmental Engineering (CSEE)
会议时间:
MAY 17-18, 2015
会议地点:
Beijing, PEOPLES R CHINA
会议主办单位:
[Rong, L. S.;Yang, R. L.;Dong, C. Q.;Zhao, C.;Xie, S. B.] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang, Peoples R China.^[Xie, S. B.] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang, Peoples R China.^[Yan, Z.] Huda Technol & Educ Dev Co Ltd, Changsha, Hunan, Peoples R China.
关键词:
uranium;enrichment;plant restoring
摘要:
By using hydroponics experiments,we observed the change of photosynthetic pigments and Malondialdehyde(MDA) content of Eichhornia crassipes,Pistia stratiotes,Vetiveria zizanioides and Acorus calamus L
作者机构:
[Liu, Yacan; Yang, Jianming; He, Chao] Univ South China, Inst Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称:
International Conference on Advances in Energy, Environment and Chemical Engineering (AEECE)
会议时间:
SEP 26-27, 2015
会议地点:
Changsha, PEOPLES R CHINA
会议主办单位:
[Liu, Yacan;Yang, Jianming;He, Chao] Univ South China, Inst Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称:
AER-Advances in Engineering Research
关键词:
cement concrete overlay;plate width divided;overlay disease;finite element analysis
摘要:
According to disease investigation and analysis of cement concrete overlay of G322 secondary road, analysis model is built by ABAQUS finite element software, vehicle load stress, temperature stress and uneven settlement of widening subgrade and other external factors of cement overlay are considered, analysis shows that the causes of longitudinal cracks of Scheme A cement concrete overlay is associated with the uneven settlement of widening subgrade, the causes of transverse cracks of local 10m cement concrete plate of scheme B is that the plate length is too long, the temperature stress is too high, scheme B is better mechanical properties and longer life than the scheme A. Guiding suggestions is proposed for design of secondary highway cement concrete pavement overlay.
摘要:
In this paper, we have presented a new method to remove Cr (VI) ions from aqueous solution. Chitosan and ferrous ions were added together to the chromium-contained solution, through two-step pH adjust, 0.5 g·l-1 chitosan and 2.0 g·l-1 FeSO4·7H2O could reduce Cr (VI) ions from 100 mg·l-1 to 0.01 mg·l-1. As compared with chitosan and ferrous alone used to remove Cr (VI), for 100 mg·l-1 Cr (VI) solution, the maximum of percentage removal of Cr (VI) by chitosan reached 94.08% when the dosage was up to 3.0 g·l-1 , ferrous ions can remove 99.96% Cr (VI) ions when the dosage was up to 3.0 g·l-1. The experimental results showed that the method of removal Cr (VI) by chitosan cooperated with ferrous ions was of great application prospect due to its high removal rate, quick removal velocity and less sludge volume.
作者机构:
[Xie, Dong; Zhou, Binkai; Wang, Yun; Mo, Shunquan] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
会议名称:
International Conference on Energy Equipment Science and Engineering (ICEESE)
会议时间:
MAY 30-31, 2015
会议地点:
Guangzhou, PEOPLES R CHINA
会议主办单位:
[Xie, Dong;Mo, Shunquan;Wang, Yun;Zhou, Binkai] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
摘要:
Radon (Rn-222) found in uranium mine shaft ventilation exhaust gases could pose hazards to the surrounding environment and the public by virtue of its progeny. Numerical calculations of the physical model for uranium mine under complex terrains were conducted to evaluate atmospheric dispersion and radon concentration distribution from the ventilation shaft using CFD methods. Factors of the two directions of atmospheric wind and four release height conditions (1, 3, 5 and 8 m) were considered to research radon dispersion in the study. Results showed that radon pollution in the North wind direction was more serious than in the South wind direction and radon concentration differences decreased with the increase of radon dispersion distance. The distance of radioactive contaminant transportation from shaft outlet exhaust was positively correlated with the release height within the region of 100 m. With the increasing release heights, the radon concentrations had a significant decline at a distance of 200 m.
摘要:
Using CFD technology, the flow field and pollutant concentration distribution of fume cupboard was simulated, and the accuracy of the numerical simulation was verified by comparison with the measured face velocity. The simulation results show that flow field distribution is turbulence, and generates vortex at the base single and upper mouth easily. It also indicates: in a single exhaust air rate, the monitor point concentration increased with the increase of pollution gases release quantity; in a single pollutant gas release quantity, the monitor point concentration was decreased with the increase of exhaust air rate, and achieve a certain exhaust air rate, the monitor point concentration reduced to the lowest.
摘要:
Through separately test the standard concrete block made by 10%, 15%, 25%, 35% of glass powder and gangue powder separately instead of the same quality cement, compared with reference group, research influence of adding different proportions of glass powder or gangue powder on compressive strength of concrete block at 7d, 28d, 60d, 120d, 180d, conservation of concrete are conducted under standard conditions. The results show that compared with the reference concrete, compressive strength of concrete will decline vary with the content of glass powder and gangue powder increases, Early strength is low and will slowly increase and stabilize lately, reach to standard strength. Suitable for making low strength concrete block, and content should not be greater than 35%.