scholarly journals Comparison of Airborne Electromagnetic and Ground-based Resistivity Observations: Case Study Banda Aceh Basin

2021 ◽  
Vol 873 (1) ◽  
pp. 012094
Author(s):  
I Irwandi ◽  
Syafrizal ◽  
Rifqan ◽  
H. Naufal ◽  
B. Siemon
Keyword(s):  
Electrical Resistivity ◽  
Structural Pattern ◽  
Local Conditions ◽  
Airborne Measurements ◽  
High Electrical Resistivity ◽  
Federal Institute ◽  
Airborne Electromagnetic ◽  
2D Resistivity ◽  
Banda Aceh

Abstract Airborne measurements are very useful to cover very large areas. Nine month after the Aceh Tsunami and Earthquake in 2004, BGR (Federal Institute for Geoscience and Natural Resources) conducted a fresh water supply exploration survey within a project called Helicopter Project Aceh (HELP ACEH). The helicopter-borne electromagnetic (HEM) device operates at five frequencies. The HEM can estimate the 1D resistivity models down to a depth of 150 m for the high electrical resistivity areas and 50 m for low electrical resistivity areas. In this paper, the airborne data of 2005 are compared with resistivity data acquired in Banda Aceh basin in 2018. The HEM output consists of 1D resistivity models derived by inversion of the processed data. These 1D resistivity models are compared with the 2D resistivity models derived from ground-based resistivity measurements. However, the 2D models on the ground are transformed into 1D resistivity models so it can be used for comparison. The transformation is conducted by averaging the resistivity values in the each layer, so every layer only has one resistivity value. Both methods are influenced by many factors. For example, resistivity on the ground is affected by local conditions. The airborne measurements are also influenced by objects that are at the surface of the ground. In some cases, the airborne resistivity models have some differences in absolute resistivity values, but they often have the same structural pattern compared with the ground-based resistivity models.

scholarly journals Geophysical Delineation of Barite-Galena Mineralization Using Coupled Electrical Resistivity (ER) and Induced Polarization (IP) Techniques. A Case Study of Iyamitet, Cross River State, South-South, Nigeria

2021 ◽  
pp. 11-18
Author(s):  
O. J. Airen ◽  
D. A. Babaiwa
Keyword(s):  
Electrical Resistivity ◽  
Joint Inversion ◽  
Induced Polarization ◽  
High Resistivity ◽  
Cross River ◽  
Cross River State ◽  
Geophysical Techniques ◽  
Mineralized Zone ◽  
2D Resistivity

A combined Electrical Resistivity (ER) and Induced Polarization (IP) techniques were carried out at Iyamitet, Cross-River State Nigeria with the aim of mapping the Barite-Galena mineralization zone within the area. Five traverses were established in orthogonal directions with length of 100 m. The traverses were established in grid format for better coverage of the study area and Dipole-Dipole electrode configuration was adopted for the data acquisition for both ER and IP. Res2Dinvx software was employed for the joint inversion of the data and the resulting 2D resistivity and chargeability images of the subsurface were interpreted qualitatively and semi-quantitatively to locate the mineralized zone. The result of the investigation revealed that the resistivity values of the suspected mineralized zones fall between 1023 ohm-m to 377599 ohm-m and the chargeability falls between 232 msec and 727 msec. The depth to the top of some of the mineralized zones is as shallow as 1.25 m and as deep as 19.8 m in other places. The results of the investigation have indicated the presence of the Barite-Galena ore within the area and this manifested as high resistivity and high chargeability zones along the traverses. The result of this investigation highlights the efficiency of combined geophysical techniques in locating mineralized zones in a basement area.

scholarly journals “Slow practicing”: i progetti di Huang Yinwu nella storica città di Shaxi tra inclusione sociale e cultura materiale

ARCHALP ◽  
2021 ◽  
Author(s):  
Edoardo Bruno ◽  
HaoHao Xu
Keyword(s):  
New Materials ◽  
Mountain Area ◽  
Local Conditions ◽  
Federal Institute ◽  
Social And Economic Development ◽  
Construction Type ◽  
Institute Of Technology ◽  
Cultural Legacies ◽  
Construction Model

The Shaxi Rehabilitation Project is a comprehensive conservation project in a remote rural area of the Yunnan Province, China. A once important stopover in the mountain area on the ancient Tea and Horse Caravan Trail, Shaxi still has plenty of built heritage. The architect Huang Yinwu, who studied at the Southeast University of Nanjing, the Swiss Federal Institute of Technology Zürich (ETH) and at the Hong Kong University, worked as a leading project architect in Shaxi for more than 17 years, from 2003. The main topics raised by the case study deal with the local characters and topographical identity in the natural environment, the traditional craftsmanship and the intervention of modern constructions, the design, expressed by identifying and enhancing the value of Shaxi’s cultural heritage and the conservation of cultural legacies into the framework of social and economic development. Shaxi has a strong construction tradition, but it is also very fragile. Unlike the urban area, the traditional rural construction type is a system of experience gradually broadened after ongoing trials and mistakes. This is the reason why it is challenging to have new creations and developments; the same goes for new materials and technologies. For architects like Huang Yinwu, it is necessary to transform the empirical system into a theoretical one, and then provide a reliable construction model that is suitable for local conditions and technologies. In another sense, the key is working with and training local artisans so that they may understand new materials and structures and develop their skills.

EVANOHM

Alloy Digest ◽  
1960 ◽  
Vol 9 (4) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Coefficient ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Temperature Coefficient Of Resistance ◽  
High Electrical Resistivity ◽  
Nickel Base

Abstract EVANOHM is a nickel-base alloy having low temperature coefficient of resistance and high electrical resistivity. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on joining. Filing Code: Ni-57. Producer or source: Wilbur B. Driver Company.

EVANOHM ALLOY S

Alloy Digest ◽  
1989 ◽  
Vol 38 (7) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Coefficient ◽  
Electromotive Force ◽  
Temperature Coefficient Of Resistance ◽  
Resistance Wire ◽  
High Electrical Resistivity ◽  
Optimum Stability

Abstract EVANOHM alloy S offers optimum stability and flexibility with regard to both size and required temperature coefficient of resistance. Its extremely low electromotive force vs copper together with its high electrical resistivity are highly desirable properties in a precision resistance wire. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-373. Producer or source: Wilbur B. Driver Company.

HIPERCO 15

Alloy Digest ◽  
2002 ◽  
Vol 51 (10) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Cobalt Content ◽  
Heat Treating ◽  
High Saturation Magnetization ◽  
Soft Magnetic ◽  
Magnetic Alloys ◽  
Soft Magnetic Alloys ◽  
High Electrical Resistivity ◽  
Technology Corporation ◽  
Carpenter Technology Corporation

Abstract Hiperco Alloy 15 is a development in soft magnetic alloys that combines the properties of high saturation, magnetization, high electrical resistivity, and lower cobalt content. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming and heat treating. Filing Code: FE-124. Producer or source: Carpenter Technology Corporation.

From converts to cooperation: Protestant internationalism, US missionaries and Indian Christians and ‘Professional’ social work between Boston and Bombay (c. 1920–1950)

2021 ◽  
pp. 1-20
Author(s):  
Michael Phillipp Brunner
Keyword(s):  
Social Work ◽  
North America ◽  
Social Gospel ◽  
Local Conditions ◽  
Historical Approach ◽  
The Social ◽  
Social Concerns ◽  
High Phase

Abstract The 1920s and 30s were a high phase of liberal missionary internationalism driven especially by American-led visions of the Social Gospel. As the missionary consensus shifted from proselytization to social concerns, the indigenization of missions and the role of the ‘younger churches’ outside of Europe and North America was brought into focus. This article shows how Protestant internationalism pursued a ‘Christian Sociology’ in dialogue with the field’s academic and professional form. Through the case study of settlement sociology and social work schemes by the American Marathi Mission (AMM) in Bombay, the article highlights the intricacies of applying internationalist visions in the field and asks how they were contested and shaped by local conditions and processes. Challenging a simplistic ‘secularization’ narrative, the article then argues that it was the liberal, anti-imperialist drive of the missionary discourse that eventually facilitated an American ‘professional imperialism’ in the development of secular social work in India. Adding local dynamics to the analysis of an internationalist discourse benefits the understanding of both Protestant internationalism and the genesis of Indian social work and shows the value of an integrated global micro-historical approach.

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