scholarly journals Numerical simulation and experimental study of aeolian sand load under aeolian sand environment

2021 ◽  
Vol 272 ◽  
pp. 01003
Author(s):  
Ying Jia ◽  
Xueru Yang
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Comparative Analysis ◽  
Concrete Structures ◽  
Practical Significance ◽  
Sand Content ◽  
Simulation Test ◽  
Aeolian Sand ◽  
Content Ratio ◽  
Long Time

Concrete structures in a sandstorm environment suffer from sandstorm erosion for a long time, which reduces the durability of concrete buildings, and then threatens the safety of buildings. Therefore, it is of great practical significance to study the aeolian sand load under the aeolian sand environment. In this paper, by numerical simulation of the sand load on the surface of bridge and simulation test of the sand load on the surface of the concrete in the sand environment, the variation law of the sand load under different sand parameters is studied. Through comparative analysis, it is concluded that the variation law of aeolian sand load in numerical simulation and test tends to be consistent with the variation of aeolian sand velocity and sand content ratio.

scholarly journals Experimental Study on Wind Erosion of Concrete Building Surface in Wind-Sand Environment

2021 ◽  
Vol 272 ◽  
pp. 01001
Author(s):  
Ying Jia ◽  
YuFei Pei ◽  
ZhiWei Xie
Keyword(s):  
Experimental Study ◽  
Wind Speed ◽  
Wind Erosion ◽  
Similarity Theory ◽  
Concrete Strength ◽  
Surface Wind ◽  
Practical Significance ◽  
Sand Particle ◽  
Sand Content ◽  
Action Time

In this paper, the effects of different wind-sand attack angle, wind speed, action time, concrete strength, sand particle size, and sand content on the surface wind erosion of concrete structures are experimentally studied. Wind erosion rate and strength loss rate are defined as the indexes to measure the degree of wind erosion of concrete. According to the similarity theory, the actual situation is deduced based on the wind erosion test, and the wind erosion time corresponding to the wind speed, the action time of wind sand, and the simulation test in the case of sand content is obtained. it makes the experimental study of wind erosion on concrete buildings to have more practical significance.

Study of the etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues and caries in children

2021 ◽  
pp. 34-42
Author(s):  
Nina Anatolievna Kamneva
Keyword(s):  
Experimental Study ◽  
Modern Society ◽  
Diagnosis And Treatment ◽  
Practical Significance ◽  
State University ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Long Time ◽  
Special Studies ◽  
Epidemiology Methods

The article discusses the results of the study of etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues, caries and their complications. The experimental study was carried out at the Department of Dentistry of the Tambov State University named after G.R. Derzhavin, Tambov, for the period from 2019 to 2021 based on the data obtained in the course of dental research of etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues, caries and their complications. The practical significance of the study lies in the fact that its theoretical provisions and the empirical results obtained can be used by dentists for further research in this area of dentistry. The relevance of the study of etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues, caries and their complications is beyond doubt in modern society. Thus, many aspects of the study of dentistry have found their place in the ontological field of dental problematic, revealing particular and special studies of etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues, caries and their complications. It can be concluded that the study of etiology, pathogenesis, epidemiology, methods of prevention, diagnosis and treatment of lesions of dental hard tissues, caries and their complications fell out of sight of researchers for a long time.

Experimental study of deformation processes in large-scale concrete structures under quasistatic loading

2020 ◽  
Vol 15 (5) ◽  
pp. 619-633
Author(s):  
Igor Shardakov ◽  
Irina Glot ◽  
Aleksey Shestakov ◽  
Roman Tsvetkov ◽  
Valeriy Yepin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Concrete Structures ◽  
Deformation Processes ◽  
Quasistatic Loading

scholarly journals Numerical and Experimental Study of Lightning Stroke to BIPV Modules

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 748
Author(s):  
Xiaoyan Bian ◽  
Yao Zhang ◽  
Qibin Zhou ◽  
Ting Cao ◽  
Bengang Wei
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Coupling Model ◽  
Maximum Temperature ◽  
Lightning Stroke ◽  
Study Results ◽  
Pv Modules ◽  
New Type ◽  
Metal Frame ◽  
Current Flows

Building Integrated Photovoltaic (BIPV) modules are a new type of photovoltaic (PV) modules that are widely used in distributed PV stations on the roof of buildings for power generation. Due to the high installation location, BIPV modules suffer from lightning hazard greatly. In order to evaluate the risk of lightning stroke and consequent damage to BIPV modules, the studies on the lightning attachment characteristics and the lightning energy withstand capability are conducted, respectively, based on numerical and experimental methods in this paper. In the study of lightning attachment characteristics, the numerical simulation results show that it is easier for the charges to concentrate on the upper edge of the BIPV metal frame. Therefore, the electric field strength at the upper edge is enhanced to emit upward leaders and attract the lightning downward leaders. The conclusion is verified through the long-gap discharge experiment in a high voltage lab. From the experimental study of multi-discharge in the lab, it is found that the lightning interception efficiency of the BIPV module is improved by 114% compared with the traditional PV modules. In the study of lightning energy withstand capability, a thermoelectric coupling model is established. With this model, the potential, current and temperature can be calculated in the multi-physical field numerical simulation. The results show that the maximum temperature of the metal frame increases by 16.07 °C when 100 kA lightning current flows through it and does not bring any damage to the PV modules. The numerical results have a good consistency with the experimental study results obtained from the 100 kA impulse current experiment in the lab.

Experimental study and numerical simulation of urea-assisted SAGD in developing exra-heavy oil reservoirs

2021 ◽  
Vol 201 ◽  
pp. 108436
Author(s):  
Daode Hua ◽  
Pengcheng Liu ◽  
Peng Liu ◽  
Changfeng Xi ◽  
Shengfei Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Heavy Oil ◽  
Oil Reservoirs ◽  
Heavy Oil Reservoirs
Sign in / Sign up

Export Citation Format

Share Document