Fin Tech: Regulatory Sand Box

2021 ◽  
Vol 56 (3) ◽  
pp. 82
Author(s):  
Biplab Chakraborty
Keyword(s):  
Sand Box

scholarly journals A Penetrometer for Quantifying the Surface Stiffness of Sport Sand Surfaces

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 64 ◽  
Author(s):  
David V. Thiel ◽  
Matthew T. O. Worsey ◽  
Florian Klodzinski ◽  
Nicholas Emerson ◽  
Hugo G. Espinosa
Keyword(s):  
Soft Tissue Injuries ◽  
Beach Sand ◽  
Depth Of Penetration ◽  
Future Studies ◽  
Novel Technique ◽  
Sand Box ◽  
Surface Stiffness ◽  
Fitness Training ◽  
The Relationship

Sand sports include running, volleyball, soccer, beach flags, ironman, and fitness training. An increased amount of soft tissue injuries have been widely reported. A novel technique of determining the surface stiffness of beach sand in-situ used a simple drop-test penetrometer. The relationship between drop height and the depth of penetration squared was linear (Pearson’s correlation coefficient r2 > 0.92). The stiffness ratio between the soft dry sand and ocean-saturated wet sand compacted by eight hours of coastal water exposure was approximately seven, which was similar to previously reported stiffness measurements in a sand box. However, the absolute stiffness values were much smaller. While this technique was manually operated, an automatic system is postulated for future studies.

Experimental Investigation on Damping Characteristics in Pump-Sand Box-Isolation System

2014 ◽  
Vol 1051 ◽  
pp. 906-909
Author(s):  
Xiang Jun Kong ◽  
Chong Zheng Chen
Keyword(s):  
Particle Size ◽  
Vibration Isolation ◽  
Influence Factor ◽  
Damping Ratio ◽  
Particle Packing ◽  
Initial Displacement ◽  
Isolation System ◽  
Damping Characteristics ◽  
Sand Box ◽  
Particle Damping

Sand is used in the pump-sand box-isolation system, studying the initial displacement, particle size and packing rate how to affect the damping ratio by free vibration experiments. The result shows that the initial displacement of the system has less effect on damping ratio, the particle packing rate is a significant influence factor of damping ratio, selecting the appropriate particle packing rate can get the maximum damping ratio, reducing the particle size can increase the system damping ratio, but the damping ratio no longer obviously changes when the particle size of is less than 1.5mm. In general, the packing rate needs to be controlled at below 70% in metal spring or rubber isolator system. This result can provide the basis for the design of particle damping vibration isolation system.

scholarly journals Sand box experiments to evaluate the influence of subsurface temperature probe design on temperature based water flux calculation

2011 ◽  
Vol 15 (11) ◽  
pp. 3495-3510 ◽  
Author(s):  
M. Munz ◽  
S. E. Oswald ◽  
C. Schmidt
Keyword(s):  
Water Flux ◽  
Subsurface Water ◽  
Pass Band ◽  
Time Lags ◽  
Water Fluxes ◽  
Amplitude Ratios ◽  
Flux Calculation ◽  
Temperature Probe ◽  
Sand Box ◽  
Flow Velocities

Abstract. Quantification of subsurface water fluxes based on the one dimensional solution to the heat transport equation depends on the accuracy of measured subsurface temperatures. The influence of temperature probe setup on the accuracy of vertical water flux calculation was systematically evaluated in this experimental study. Four temperature probe setups were installed into a sand box experiment to measure temporal highly resolved vertical temperature profiles under controlled water fluxes in the range of ±1.3 m d−1. Pass band filtering provided amplitude differences and phase shifts of the diurnal temperature signal varying with depth depending on water flux. Amplitude ratios of setups directly installed into the saturated sediment significantly varied with sand box hydraulic gradients. Amplitude ratios provided an accurate basis for the analytical calculation of water flow velocities, which matched measured flow velocities. Calculated flow velocities were sensitive to thermal properties of saturated sediment and to temperature sensor spacing, but insensitive to thermal dispersivity equal to solute dispersivity. Amplitude ratios of temperature probe setups indirectly installed into piezometer pipes were influenced by thermal exchange processes within the pipes and significantly varied with water flux direction only. Temperature time lags of small sensor distances of all setups were found to be insensitive to vertical water flux.

scholarly journals Formation and remediation simulation of an in-situ reactive zone with nanoiron for a nitrobenzene-contaminated aquifer

2018 ◽  
Vol 18 (6) ◽  
pp. 2071-2080
Author(s):  
Li Hui ◽  
Zhang Xue-qing
Keyword(s):  
Fine Sand ◽  
Coarse Sand ◽  
Water Yield ◽  
Permeability Change ◽  
Contaminated Aquifer ◽  
Permeability Constant ◽  
Sand Box ◽  
Reactive Zone ◽  
The Media

Abstract A two-dimensional simulated sand box was built to investigate the formation and remediation of an in-situ reactive zone (IRZ) of nanoscale zero-valent iron (NZVI) for a nitrobenzene-contaminated aquifer, and the permeability change of the zone was calculated through the loss of waterhead. The experimental results demonstrated that the remediation area in coarse sand was obviously larger than that in fine sand. The nitrobenzene concentration reached a stable level of 87.24 and 170.24 mg/L in coarse and fine sand by 50 d and 40 d, respectively; after 60 d, the concentration of aniline as the reduction end-product of nitrobenzene was 97.02 and 49.40 mg/L, corresponding to a mean production rate of 40.1% and 20.8%, respectively. This indicated that a wider zone will be formed in the media with a larger size, which is beneficial for pollution remediation. The water yield of the aquifer declined by 13.8% and 11.9% in coarse and fine sand after 60 d, and the final permeability constant was 22.94 and 1.82 m/d (declining by 60.9% and 70.6%), respectively. The reactive zone remained stable and the injection of NZVI slurry could not cause any dramatic changes in the aquifer permeability.

Constraints on friction coefficients by an inverse analysis of sand box thrust dips

2007 ◽  
Vol 29 (1) ◽  
pp. 117-128 ◽  
Author(s):  
Bertrand Maillot ◽  
Christophe Barnes ◽  
Jean-Marie Mengus ◽  
Jean-Marc Daniel
Keyword(s):  
Inverse Analysis ◽  
Friction Coefficients ◽  
Sand Box

Virtual Sand Box:Development of an Application of Virtual Environments for Clinical Medicine

1994 ◽  
Vol 3 (1) ◽  
pp. 45-59 ◽  
Author(s):  
Ryugo Kijima ◽  
Kimiko Shirakawa ◽  
Michitaka Hirose ◽  
Kenji Nihei
Keyword(s):  
Virtual Environments ◽  
Virtual Environment ◽  
Clinical Medicine ◽  
Input Device ◽  
Display System ◽  
Virtual Reality Technology ◽  
Psychological Treatments ◽  
Sand Box ◽  
The People ◽  
Insight Into

The sand play technique (Sandspiel) has often been used in psychological treatments. The primary purpose of this study was to construct a practical virtual environment to support the application of this technique with computers. The prototype application called “Virtual Sand Box” was developed to test the Sand Play Technique in the diagnosis and treatment of autistic patients. The display system and input device are discussed. A detailed description is also provided for how a virtual environment was constructed to cater input systems into output systems in order to facilitate manipulation tasks for the user. Experimental results gave insight into the feasibility and advantages of applying virtual reality technology to clinical medicine, particularly with respect to the diagnosis of the people with psychological and psychiatric sicknesses such as autism and neurosis.

Sign in / Sign up

Export Citation Format

Share Document