期刊:
ICEET: 2009 INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT TECHNOLOGY, VOL 1, PROCEEDINGS,2009年:415-+
通讯作者:
Gu, Weili
作者机构:
[Luo, Qinghai; Gu, Weili] Univ South China, Dept Urban Construct, Hunan Hengyang, Peoples R China.;[Luo, Qinghai; Gu, Weili] Cent S Univ, Sch Energy & Power Engn, Hunan Changsha, Peoples R China.;[Wang, Hanqing; Kou, Guangxiao] Hunan Univ Technol, Hunan Zhuzhou, Peoples R China.
通讯机构:
[Gu, Weili] U;Univ South China, Dept Urban Construct, Hunan Hengyang, Peoples R China.
关键词:
the organic heat transfer material heater;finite time thermodynamics;exergy analysis;energy-saving optimization
摘要:
According to the low efficiency of the organic heat transfer material heater, this paper studies the heat transfer process under temperature difference in the organic heat transfer material heater with the finite time thermodynamics, derives the calculation formula and characteristic parameter x to determine the minimum temperature difference with the minimum exergy loss. Based on this, this paper proposes that the characteristic parameter x can be used as the optimization criterion of energy-saving and to judge the energy utilization efficiency of the organic heat transfer material heater, furthermore, proposes the concrete energy-saving optimization strategy by controlling the mean heat absorption temperature, and gives an actual calculation, the result accords with the analysis.
摘要:
The characteristics of the temperature and humidity in underground space was analyzed, and other factors, which influence on air environment in underground space, are also analyzed, such as radioactive contamination, microorganism, and harmful gases. If adjusted to local conditions, Moisture proofing, ventilating, dedusting and sterilizing are feasible ways to improve the air environment. Independent dehumidifying and adding air anion are also effective measures to improve the air quality.
期刊:
GEOTECHNICAL ENGINEERING FOR DISASTER MITIGATION AND REHABILITATION,2008年:955-960
通讯作者:
Xiong, Zhibiao
作者机构:
[Wang, Qiyun; Xiong, Zhibiao] Univ S China, Urban Construct Coll, Hengyang 421001, Peoples R China.
通讯机构:
[Xiong, Zhibiao] U;Univ S China, Urban Construct Coll, Hengyang 421001, Peoples R China.
摘要:
Horizontal displacement monitoring was carried out for the complicated planar foundation pit. After the excavation, monitoring results indicated the horizontal displacement of the top retaining structure exceeded the advance warning and dangerous situation continued to aggravate. A comprehensive site investigation was carried out aiming at finding out the reasons for the warning alarm. The measures were taken to treat the dangerous situation pertinently and obtained good effect.
摘要:
In this paper, the influence of windows was analyzed on thermal ventilation in workshop. The influence was also numerically simulated by k-epsilon turbulance model and CFD software. In designing natural ventilation, to coordinate the dimensiom, between the inlet and owlet openings and to play down the neutral plane properly may be the effective measures to increase ventilation efficiency. In supervising ventilation, the cooperation should be intensified between the inlet windows, the upper-side windows and elerestories in order that airflow short-circuit, may be avoided, The simulation results was verified by ventilation reform practice. The windows were reconstructed to improve ventilation. After ventilation reform, the temperature falls 3.3-5.7 degrees C in the working region. The hot environment of the workshop has been greatly improved.
会议名称:
第一届现代铁路创新与可持续发展国际会议(The First International Symposium on Innovation & Sustainability of Modern Railway)
会议时间:
2008-10-16
会议地点:
南昌
会议论文集名称:
第一届现代铁路创新与可持续发展国际会议(The First International Symposium on Innovation & Sustainability of Modern Railway)论文集
关键词:
foundation pit;deepen ezcavation;FEM;H-S model;braces pre-stress;staged construction;process design
摘要:
The knowledge of the effects on existing supporting structures performances due to deepen excavation of foundation pits are necessitated to avoid the occurrences of invalidating supports or conservation designs. This paper proposed an analysis model with Finite Element Method (FEM) to dynamic simulate the gradually varieties of earth-structure association and construction load and their inter-influences. The key techniques of establishing the model, including selection of simulated archetype, simulating methods, and processes designs of staged construction, are discussed through proposing an integrated method in estimating calculating range of the model and an alternating method in evaluating the brace pre-stress, introducing the Hardening-Soil (H-S) model, adopting the staged construction method, and respectively designing the basic construction process, optimized and consulting construction processes of braced pre-stress.
期刊:
GEOTECHNICAL ENGINEERING FOR DISASTER MITIGATION AND REHABILITATION,2008年:899-+
通讯作者:
Sun, Bing
作者机构:
[Ding, Dexin; Sun, Bing] Cent S Univ, Sch Resource & Safety Engn, Changsha 410083, Hunan, Peoples R China.;[Sun, Bing] Univ South China, Sch Urban Construct, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zeng, Sheng] Univ South China, Sch Nucl Resources & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构:
[Sun, Bing] C;Cent S Univ, Sch Resource & Safety Engn, Changsha 410083, Hunan, Peoples R China.
摘要:
Because of the uncertainty of the parameters and characteristics of rock joints, this paper performed research in three respects. (1)The contract model of structural planes established by using ABAQUS, and, based on the contract model, the non-linear finite element model for analyzing the stability of rock slope was established. (2) The model between the rock mass mechanics parameters and anti-slide and down-slide forces was built up by using the Adaptive Neuro-Fuzzy Inference System (ANFIS) consisting of artificial neural network and fuzzy logical inference. (3) The program of reliability analysis was compiled by using Monte-Carlo simulation (MCS) and MATLAB, a new reliability analysis method was proposed by coupling ABAQUS, ANFIS and MCS, and the method was used to analyze the reliability of a rock slope. The results show that the contact model of structural planes has great influence on the precise of numerical simulation, that the tangent spring element model could ensure the precision and enhance the convergent efficiency, and that the method could avoid compiling redundant finite element program, reduce the computing time, and improve calculation precision.
摘要:
Ventilation has been proved to be a main method, to eliminate radon and radon daughters of uranium mine. At present, in the uranium mine ventilation system, several problems are existed as follows: jumbled systems, serious air leakage, series ventilation, low effective air volume rate and unqualified rate of concentrations of radon and its daughters and so on. According to the practical rectifications of uranium mine ventilation system, some summarizing experiences of improving measures are presented in the paper, which include investigating radon source, controlling the direction and size of radon seepage, exerting the inhibition effects of ventilation, reducing air leak, increasing the ability of radon dilution and establishing complete ventilation system. In addition, a practical example is analyzed to introduce safety assessment method for uranium mine ventilation system.
会议名称:
The 2007' International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
会议时间:
2007-04-17
会议地点:
河南焦作
会议论文集名称:
2007采矿科学与安全技术国际学术会议
关键词:
karsts crevasse;water-penetration and putty-gushing;aquifuge;mortar filling
摘要:
The "338"tin mine located on Baisha Town of Changning City in Hunan Province, the kaists crevasse grit-filled tin deposit, had a serious water-penetration and putty-gushing accident in 2# admission passage of 95m center-section, causing five-person dead on May 22, 2005. By analyzing the ore deposit hydrology geological data, the mining technology and the geologic structure, this paper concludes that the blasting during mining tunneling process destroying the aquifuge of karsts pipeline is the immediate cause of this accident, and the continuous raining increasing the hydrodynamic pressure in karsts pipeline is the important cause of this accident. This article has comprehensively analyzed the mechanism of water-penetration and putty-gushing, and carried on preliminary discussion on the geological forecast technology and the control technology of. the water-penetration and putty-gushing disaster.
摘要:
This paper analyzed the influence of neutral plane on natural ventilation in workshop. For several typical heights of neutral plane of a molding workshop, its influence on ventilation was simulated by means of CFD. In designing natural ventilation, to coordinate the dimensions between the inlet and outlet openings and. to play down the neutral plane properly may be the effective measures to increase ventilation efficiency. In supervising ventilation, the cooperation should be intensified between the inlet windows, the secondary windows and clerestories in order that airflow short-circuits may be avoided.
会议名称:
第五届暖通空调国际研讨会(Proceedings of the 5th International Symposium on Heating,Ventilating and Air Conditioning)
会议时间:
2007-09-07
会议地点:
北京
关键词:
TE air-conditioner;Figure of merit;TE module;Structure
摘要:
This paper reviews the progress of thermoelectric (TE) air conditioning in the past 40 years, especially the advancement in the past 10 years. It is still difficult to popularize large scale TE building air-conditionings; while small ones, applied in some special situations, present some distinct advantages in comparison with other air-conditioners. The prohibition of CFCs may bring new opportunity and impetus to develop TE devices. It is anticipated that nanostructured TE materials presents optimistic prospect of increasing figure of merit.
会议名称:
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
会议时间:
2007-07-31
会议地点:
昆明
会议论文集名称:
第十二届水-岩相互作用国际学术研讨会
摘要:
The distribution character of radioactive waste on uranium mill-tailing sites of China was presented in this paper. The progress on pollution control technology of radionuclides diffusion on uranium mill-tailing sites was summarized. Furthermore, the progresses on simulation of radionuclides migration in the groundwater of uranium mill-tailing sites, permeable reactive barrier (PRB) and microbial remedy technology were discussed in detail.
摘要:
In order to search for the better biosorbent of uranium (VI) biosorption and its mechanism, Bacillus subtilis was employed in this research. The results showed that the adsorption capacity was achieved to 358.18 mg g-1 and with an optimum pH of 6.0. Cu2+, Fe2+, CO32- etc. would interfere with adsorption greatly. Better conformity of biosorption data with the Freundlich model suggested non-monolayered uranium biding. The adsorption results of the thermodynamic parameters indicated that biosorption of uranium were endothermic and spontaneous. TEM and SEM analysis of uranium loaded biomass revealed intracellular U sequestration and U absorbed on the cell surface respectively. It was confirmed that carboxyl, amino, and acylamino groups are responsible for biosorption using IR. More than 99% of biomass-bound uranium was recovered using sodium carbonate and sodium bicarbonate.