scholarly journals Ground Penetrating Radar: The Electromagnetic Signal Attenuation and Maximum Penetration Depth

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Giovanni Leucci
Keyword(s):  
Penetration Depth ◽  
Ground Penetrating Radar ◽  
Electromagnetic Signal ◽  
Signal Attenuation ◽  
Maximum Penetration Depth ◽  
Maximum Penetration ◽  
Ground Penetrating

Design and Tests of a Multi-pin Flexible Seedling Pick-up Gripper for Automatic Transplanting

2019 ◽  
Vol 35 (6) ◽  
pp. 949-957 ◽  
Author(s):  
Luhua Han ◽  
Francis Kumi ◽  
Hanping Mao ◽  
Jianping Hu
Keyword(s):  
Control System ◽  
Penetration Depth ◽  
Working Pressure ◽  
Pneumatic Control ◽  
Position Detection ◽  
Maximum Penetration Depth ◽  
Timely Response ◽  
Plug Seedling ◽  
Maximum Penetration ◽  
Push Out

HighlightsA multi-pin flexible pick-up gripper with a four-jaw chuck having four pick-up pins has been developed.The gripper can effectively grasp, hold and release plug seedlings with low damages to the plants and the root soil.Based on a typical on-off control and cylinder stroke position detection, the control system for timely response was designed to automate the process of picking up and releasing seedlings.Abstract. A multi-pin flexible seedling pick-up gripper for automatic transplanting was developed and evaluated. The gripper having a four-jaw chuck mainly consists of a parallel-type air gripper with four fingers, four fork frames, four cylinder fingers, and several connecting/supporting parts. The air gripper moves to open and close the cylinder fingers, and the cylinder fingers each having a flexible pin grasp and release the seedling. When the pick-up gripper extracts seedlings from the tray cells, its four cylindrical fingers push out four pick-up pins to penetrate deep into the root soil and then close, making the pick-up pins to firmly hold the root soil for lifting. When the pick-up gripper releases seedlings, its fingers open, making the pick-up pins loosen the root soil and then pull back for discharging. An electrical and pneumatic control system was designed to coordinate the execution of each action. The pick-up gripper attached to a robotic manipulator was tested on a range of plug seedling transplanting parameters and conditions. The results showed that penetration depth, seedling species, and the interaction of working pressure and seedling species significantly influenced the successful automatic transplanting. On the whole, the seedling integrity ratio in automatic transplanting was found to be up to 93.37%. For optimum performance of the device in transplanting seedlings, the pick-up pins of the multi-pin gripper need to grasp the maximum amount of root soil at their maximum penetration depth. Keywords: Gripper, Flexible, Multi-pin, Seedlings, Transplanting.

scholarly journals Theoretical Justification for the One-Dimensional Geolocation Method

2020 ◽  
Vol 174 ◽  
pp. 01009
Author(s):  
Dmitry Sirota ◽  
Sergei Prostov ◽  
Egor Rasumov ◽  
Nikolay Loskutov
Keyword(s):  
Ground Penetrating Radar ◽  
Electromagnetic Signal ◽  
Numerical Implementation ◽  
Problem Statement ◽  
Theoretical Justification ◽  
Scanning Method ◽  
One Dimensional ◽  
Equations Of Electrodynamics ◽  
The One ◽  
Ground Penetrating

In this article we will discus the usage feature of the ground penetrating radar (GPR) for the solution underground geotechnologies problems. One of the main problems by the usage GPR method is that the surface of the workings is shielded by metal elements of support (frames, fittings, tightening and other). In this article we suggest to use one- dimensional GPR-scanning method instead of traditional GPR-profiling method. We assume that the scanning will be performed on the development contour in areas free from shielding. For justification one- dimensional GPR method we propose a mathematical model for the propagation of an electromagnetic signal in an inhomogeneous medium based on classical equations of electrodynamics. We also present a numerical implementation of it, which confirms the validity of the accepted problem statement.

An Empirical Correlation for Maximum Penetration Depth of a Particle Impacting on a Free Surface at its Critical Velocity Condition

2011 ◽  
Vol 361-363 ◽  
pp. 320-323 ◽  
Author(s):  
Dong Mei Liu ◽  
Geoffrey Michael Evans ◽  
Qing Lin He
Keyword(s):  
Penetration Depth ◽  
Critical Condition ◽  
High Speed ◽  
Least Squares Method ◽  
Density Ratio ◽  
Video Camera ◽  
Empirical Correlation ◽  
Liquid Density ◽  
Maximum Penetration Depth ◽  
Maximum Penetration

Film flotation is a process which consumes much lower energy than mechanical cells. The extended film flotation technique is to separate mineral mixtures by different critical impact velocities. In this study the maximum penetration depth of a particle at its critical condition was investigated experimentally and theoretically. Experiments were performed using spherical glass beads of different diameters and hydrophobicities and different liquids. The penetration depth at critical condition was recorded and measured using high speed video camera. Buckingham’s PI theorem was applied to analyse the dimensionless groups, and then an empirical correlation for penetration depth was obtained by partial least squares method. It was found that the prediction results of the empirical equation were in good agreement with the measurements. Also, the influence factors were analysed. It was noticed that the hydrophobicities of particle and particle-liquid density ratio had most significant effects on the penetration depth.

scholarly journals Landslide investigations using the geoelectrical scanning method and ground penetrating radar: Case studies

Tehnika ◽  
2021 ◽  
Vol 76 (4) ◽  
pp. 419-425
Author(s):  
Filip Arnaut ◽  
Branislav Sretenović
Keyword(s):  
Ground Penetrating Radar ◽  
Geophysical Methods ◽  
Relevant Information ◽  
Electromagnetic Signal ◽  
Near Surface ◽  
Scanning Method ◽  
Low Resistivity ◽  
Geotechnical Investigations ◽  
Landslide Body ◽  
Ground Penetrating

Geotechnical investigations of landslides for future mitigation are a complex task. To obtain relevant information, various geophysical methods are used, with varying degrees of success. The geoelectrical scanning method, also known as Electrical Resistivity Tomography (ERT) has been successfully applied in several locations in Serbia in the las three decades. The geoelectrical scanning method was used during investigations of landslides: Umka, Lukovska banja, Tara, and Trandžament, while both geoelectrical scanning and Ground Penetrating Radar (GPR) were utilized at the Trandžament landslide. The achieved results from both methods are mutually correlated at the Trandžament landslide. Correlation of GPR data with geoelectrical scanning data was only possible since there were no nearsurface low resistivity zones in the Trandžament landslide body. Otherwise, electromagnetic signal attenuation would be high in the presence of near-surface low resistivity zones, and a quality signal would be impossible to detect at the receiving antenna.

Modelling of diesel fuel penetration depth in protective sand bed

2020 ◽  
Vol 10 (3) ◽  
pp. 300-304
Author(s):  
Anastasia V. Massold ◽  
◽  
Dzhamil U. Dumbolov ◽  
Alexander V. Dedov ◽  
◽  
...  
Keyword(s):  
Penetration Depth ◽  
Diesel Fuel ◽  
Protective Layer ◽  
Primary Source ◽  
High Rate ◽  
Fuel Distribution ◽  
Maximum Penetration Depth ◽  
Fuel Storage ◽  
Maximum Penetration ◽  
Two Stages

When deploying a temporary fuel storage warehouse, the primary source of soil contamination by oil products is technological losses related to the leakage of isolation valves. To protect the soil from contamination, containers are placed on a layer of sand. The thickness of the sand layer depends on the volume of possible losses. The purpose of the work is to model the depth of diesel fuel penetration into the protective layer of sand bed. The method of performing the experiment imitated a high rate of fuel penetration in the form of droplets onto the protective layer. The article considers the mechanism of fuel penetration into sand and factors, determining the penetration depth. It is established that the mechanism of fuel penetration into the protective layer has two stages, on each of which the penetration depth and rate of fuel distribution are different. The maximum penetration depth is reached on the first stage and depends on the quantity of fuel. The author developed the model, which allows the determination of the thickness of the sand bed protective layer with known granulometric particle composition necessary for the prevention of diesel fuel penetration into soil.

scholarly journals Looking through drumlins: testing the application of ground-penetrating rada

2014 ◽  
Vol 60 (224) ◽  
pp. 1126-1134 ◽  
Author(s):  
Matteo Spagnolo ◽  
Edward C. King ◽  
David W. Ashmore ◽  
Brice R. Rea ◽  
Jeremy C. Ely ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Feasibility Study ◽  
Ground Penetrating Radar ◽  
Surface Profile ◽  
Weather Conditions ◽  
Clayey Sediment ◽  
Sedimentary Architecture ◽  
Unfavourable Weather ◽  
Ground Penetrating ◽  
Radar Antenna

AbstractGround-penetrating radar (GPR) is becoming a commonly applied technique in geomorphology. However, its use in the study of subglacial bedforms has yet to be fully explored and exploited. This paper presents the results of a GPR feasibility study conducted on a drumlinized terrain in Cumbria, UK, where five drumlins were investigated using multiple radar antenna frequencies. The site was selected for the presence of nearby bedrock outcrops, suggesting a shallow drumlinized diamict–bedrock contact and a permeable lithology. Despite the clayey sediment and unfavourable weather conditions, a considerable penetration depth of ~12 m was achieved when using a 50 MHz antenna, with a separation of 1 m, trace spacing of 1 m and 128-fold vertical stack. Results indicate that the drumlinized diamict is in direct erosional contact with the bedrock. While the internal drumlin geometry is generally chaotic on the stoss side, evidence of layering dipping downflow at an angle greater than the drumlin surface profile was found on the lee side. The inter-drumlin areas comprise ~4 m of infill sediment that masks part of the original drumlin profile. Overall, this study indicates that GPR can be deployed successfully in the study of glacial bedform sedimentary architecture.

A Corrosion Localization Assessment of the Mild Steel Used for Nuclear Waste Package

1989 ◽  
Vol 176 ◽  
Author(s):  
Masatsune Akashi ◽  
Takanori Fukuda ◽  
Hiroshi Yoneyama
Keyword(s):  
Mild Steel ◽  
Penetration Depth ◽  
Nuclear Waste ◽  
Ultrasonic Inspection ◽  
Gumbel Distribution ◽  
Distribution Model ◽  
Waste Package ◽  
Maximum Penetration Depth ◽  
Maximum Penetration ◽  
High Level

ABSTRACTThis paper describes a study of corrosion behavior of a mild steel as a candidate of the high-level nuclear waste package in the geological disposal situations, conducted to establish a model for estimating the corrosion allowance requirement to achieve the 1,000 year lifetime for the package. In several series of galvanostatic tests, the maximum penetration depth and the depth distribution were measured for each specimen with a sophisticated ultrasonic inspection technique. The Gumbel distribution model was successfully used in analyzing each set of data for the maximum penetration depth. Relations among the average penetration depth, the maximum penetration depth, and the corrosion allowance requirement were discussed.

scholarly journals Estimating Flow Characteristics of Different Weir Types and Optimum Dimensions of Downstream Receiving Pool

2010 ◽  
Vol 58 (4) ◽  
pp. 245-260 ◽  
Author(s):  
M. Emiroglu
Keyword(s):  
Penetration Depth ◽  
Open Channel ◽  
Flow Characteristics ◽  
Channel System ◽  
Maximum Penetration Depth ◽  
Jet Trajectory ◽  
Maximum Penetration ◽  
Labyrinth Weirs ◽  
Bubble Zone ◽  
Free Overfall

Estimating Flow Characteristics of Different Weir Types and Optimum Dimensions of Downstream Receiving PoolThis paper presents the results of a laboratory study on the flow characteristics of sharp-crested weirs, broad-crested weirs, and labyrinth weirs. The variation of the maximum bubble penetration depth for different weir types is investigated depending on overfall jet expansion, discharge, and drop height. Moreover, most efficient depth, length and width of the downstream receiving pool in an open channel system are studied by considering the penetration depth, overfall jet expansion, jet trajectory and the bubble zone. The results show that overfall jet expansion at the labyrinth weirs is significantly wider than the rectangular sharp-crested weirs and the trapezoidal sharp-crested weir. It is demonstrated that the labyrinth weirs have the lowest values of bubble penetration depth among the weirs tested. Furthermore, it is found that the rectangular and the trapezoidal weirs are observed to have the highest bubble penetration depth among all weirs. Consequently, empirical equations are obtained for predicting the maximum penetration depth of bubbles, trajectory of free overfall nappe, jet expansion of free overfall nappe, and the length of the bubble zone.

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