Experiment Research from Macro to Micro on Microbial-Induced Clogging by Adding Potato Soup in Beijing Sand Column

2011 ◽  
Author(s):  
Hechao Zhang ◽  
Hongxian Guo ◽  
Meng Li ◽  
Xiaohui Cheng
Keyword(s):  
Experiment Research ◽  
Sand Column

Simulation and experiment research of a 3D flexible tactile sensor

2011 ◽  
Vol 25 (2) ◽  
pp. 129-134
Author(s):  
Guanghui Cao ◽  
Ying Huang ◽  
Wu Zhang ◽  
Caixia Liu
Keyword(s):  
Tactile Sensor ◽  
Experiment Research ◽  
Simulation And Experiment

scholarly journals Effect of Different Mineralization Modes on Strengthening Calcareous Sand under Simulated Seawater Conditions

2021 ◽  
Vol 13 (15) ◽  
pp. 8265
Author(s):  
Shiyu Liu ◽  
Bowen Dong ◽  
Jin Yu ◽  
Yanyan Cai ◽  
Xingqian Peng ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Construction Projects ◽  
Construction Material ◽  
X Ray Diffraction ◽  
Calcareous Sand ◽  
Sand Column ◽  
Sporosarcina Pasteurii ◽  
Phosphate Mineralization ◽  
Filling Water ◽  
Simulated Seawater

Calcareous sand, as a blow-fill or construction material, is widely used in island and reef construction projects in marine environments after treatment. When microorganism-induced mineralization is used to strengthen calcareous sand, salinity and other conditions in the marine environment will adversely affect microorganisms or their mineralization process. For this reason, the two environmental conditions created by deionized water and simulated seawater were introduced to explore their effects on the growth and urease activity of Sporosarcina pasteurii. Then, the changes in the permeability and mechanical strength of calcareous sand under different mineralization methods were compared by one-dimensional sand column tests. Finally, the reinforcement mechanism was compared and analyzed based on the results of scanning electron microscopy and X-ray diffraction tests. The results show that Sporosarcina pasteurii can induce carbonate and phosphate precipitation and mineralization to strengthen calcareous sand in simulated seawater. The mineralized products greatly reduce the permeability of calcareous sand and significantly improve the mechanical strength by wrapping calcareous sand particles, filling water seepage channels and cementing adjacent particles. The reinforcement effect of carbonate mineralization is better than that of phosphate mineralization, but phosphate mineralization has less impact on the environment during the treatment process.

scholarly journals Applications of micropolar SPH in geomechanics

2021 ◽  
Author(s):  
Chengwei Zhu ◽  
Chong Peng ◽  
Wei Wu
Keyword(s):  
Strain Localization ◽  
Biaxial Compression ◽  
Parameter Study ◽  
Sand Column ◽  
Column Collapse ◽  
Micropolar Continua ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Micropolar Model ◽  
Geotechnical Problems

AbstractA smoothed particle hydrodynamics code based on micropolar continua for geomaterials is developed for problems involving large deformation and shear strain localization. Two typical geotechnical problems, i.e., biaxial compression test and sand column collapse, are simulated using classical and micropolar model to demonstrate the performance of the newly proposed method. A parameter study is given on the scale effect in the micropolar continua.

Porosity waves in a fluidized sand–column test

1998 ◽  
Vol 356 (1747) ◽  
pp. 2591-2608 ◽  
Author(s):  
I. Vardoulakis ◽  
M. Stavropoulou ◽  
A. Skjaerstein
Keyword(s):  
Column Test ◽  
Sand Column

Modeling Analysis and Experiment Research on Rotary Motor Buffer Overflow Valve

2014 ◽  
Vol 709 ◽  
pp. 68-73
Author(s):  
Yuan Shen Zhang ◽  
Xue Ping Xian ◽  
Jie Yin
Keyword(s):  
Service Life ◽  
Operating Performance ◽  
Computer Software ◽  
Buffer Overflow ◽  
Experiment Research ◽  
Maximum Displacement ◽  
Hydraulic Impact ◽  
Modeling Analysis ◽  
Pressure Impact ◽  
Rotary Motor

This paper studies a buffer overflow valve that is attached to a hydraulic rotary motor which could reduce high hydraulic impact when the hydraulic rotary motor starts, brakes or suddenly reverses. A rotary motor buffer overflow valve was modeled and simulated using a computer software, AMESim, and the relation of the buffer overflow valve to the hydraulic impact experienced by the motor was analyzed. The cushioning property of the buffer overflow valve of a rotary motor is verified by using an excavator. It is concluded that having a reasonable design of the buffer overflow valve’s maximum displacement for the buffer set and diameter size for the buffer damping hole, it can reduce the pressure impact experienced by the hydraulic rotary motor and improve its operating performance, which also improves the service life of the system or its hydraulic components.

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