scholarly journals Development of a drone‐borne electromagnetic survey system for searching for buried vehicles and soil resistivity mapping

2021 ◽  
Author(s):  
Yuji Mitsuhata ◽  
Takumi Ueda ◽  
Akiya Kamimura ◽  
Shin Kato ◽  
Atsushi Takeuchi ◽  
...  
Keyword(s):  
Soil Resistivity ◽  
Survey System

Evaluating Large-Scale STEM Outreach Efficacy with a Consistent Theme: Thermodynamics for Elementary School Students

2018 ◽  
Author(s):  
Joseph DeWilde ◽  
Esha Rangnekar ◽  
Jeffrey Ting ◽  
Joseph Franek ◽  
Frank S. Bates ◽  
...  
Keyword(s):  
Elementary School ◽  
Learning Outcomes ◽  
Elementary School Students ◽  
Large Scale ◽  
College Education ◽  
School Students ◽  
Central Concept ◽  
Specific Goal ◽  
Survey System ◽  
Society Today

A biannual chemistry demonstration-based show named “Energy and U” was created to extend the general outreach themes of STEM fields and a college education with a specific goal: to teach the First Law of Thermodynamics to elementary school students. Energy is a central concept in chemical education, most STEM disciplines, and it is the concept at the foundation of many of the greatest challenges faced by society today. The effectiveness of the program was analyzed using a clicker survey system. This study provides one of the first examples of incorporating real-time feedback into large- scale chemistry-based outreach events for elementary school students in order to quantify and better understand the broader impact and learning outcomes.

scholarly journals Effect of Earthing Enhancing Compound (EEC) on Improving Tower Footing Resistance of a 500 kV Tower in a Rocky Area

2021 ◽  
Vol 11 (12) ◽  
pp. 5623
Author(s):  
Nur Alia Farina Mohd Nasir ◽  
Mohd Zainal Abidin Ab Kadir ◽  
Miszaina Osman ◽  
Muhamad Safwan Abd Rahman ◽  
Ungku Anisa Ungku Amirulddin ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Comparative Analysis ◽  
Transmission Line ◽  
Structure Analysis ◽  
Current Distribution ◽  
Soil Profile ◽  
Soil Structure ◽  
Soil Resistivity ◽  
Transmission Towers ◽  
Rocky Soil

This paper presents a comparative analysis of different earthing designs’ performances, with particular interest on the use of earthing enhancing compound (EEC) for a selected earthing design of 500 kV transmission towers in a rocky soil, using the SESCAD tool of the Current distribution, electromagnetic field grounding and soil structure analysis (CDEGS) software. The simulation included the interpretation of soil profile and comparison between designs A, B and C, which are currently used for the 500 kV tower footing resistance (TFR) improvement. Results showed each design had reduced the TFR by 66%, 54.7% and 63.2% for the towers T42, T48 and T50, respectively. In some cases, further improvement of TFR is required, especially in the rocky area where the soil resistivity (SR) value is of more than 500 Ω⋅m. In this case, EEC was used in Design C, encasing both the vertical and horizontal electrodes, and it reduced the TFR further by 16% to 20%. The characteristics of the soil and earthing arrangement design play an important role in achieving a low TFR value, which is directly proportional to the backflashover occurrence and thus to the transmission line performance.

Preparation and Long-Term Stability Study of Steel Fiber/Graphite Conductive Concrete

2016 ◽  
Vol 680 ◽  
pp. 361-364 ◽  
Author(s):  
Jun Du ◽  
Cheng Tang ◽  
Bo Jia ◽  
De Zhang ◽  
Qiang Miao
Keyword(s):  
Corrosion Resistance ◽  
Steel Fiber ◽  
Stability Study ◽  
Soil Resistivity ◽  
Grounding Resistance ◽  
Term Stability ◽  
Long Term Stability ◽  
Conductive Fillers ◽  
The Common

The steel fiber/graphite conductive concrete is applied in power system grounding. In high soil resistivity regions, the common methods for reducing the grounding resistance are not practical. It is difficult for grounding resistance of substations to meet the requirements of working earthing and safety earthing. In order to solve this problem, a steel fiber/graphite conductive concrete is developed in this paper. Steel fiber and graphite are added as conductive fillers. The long-term stability of the steel fiber/graphite conductive concrete is studied. The experiment results show that steel fiber/graphite conductive concrete not only maintains excellent conductivity, but also has good mechanical strength and corrosion resistance in 300 days.

The influence of seasonal soil moisture on the behavior of soil resistivity and power distribution grounding systems

2015 ◽  
Vol 118 ◽  
pp. 76-82 ◽  
Author(s):  
Vilson Luiz Coelho ◽  
Alexandre Piantini ◽  
Hugo A.D. Almaguer ◽  
Rafael A. Coelho ◽  
Wallace do C. Boaventura ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Power Distribution ◽  
Soil Resistivity

The Design of a Resources Survey System

1969 ◽  
Vol 7 (4) ◽  
pp. 200-205
Author(s):  
Michael Richter
Keyword(s):  
Survey System

Design and Implementation of a New Serverless Conversational Survey System

2021 ◽  
Author(s):  
Wenbin Guo ◽  
Shaoyi Zong ◽  
Songxi Chen ◽  
Fengxiang Zhao ◽  
Yi Shang
Keyword(s):  
Design And Implementation ◽  
Survey System
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