Influence of ammonium tungstate additive in metallization baths on Ni-Cu-P resistive layer properties

2017 ◽  
Author(s):  
Wojciech Filipowski ◽  
Zbigniew Pruszowski ◽  
Krzysztof Waczynski ◽  
Natalia Waczynska-Niemiec ◽  
Andrzej Czerwinski ◽  
...  
Keyword(s):  
Resistive Layer ◽  
Ammonium Tungstate

Permafrost mapping by audiofrequency magnetotellurics

1978 ◽  
Vol 15 (10) ◽  
pp. 1539-1546 ◽  
Author(s):  
A. Koziar ◽  
D. W. Strangway
Keyword(s):  
Mackenzie Delta ◽  
Conductive Layer ◽  
Frequency Range ◽  
Layer Model ◽  
Resistive Layer ◽  
Asymptotic Models ◽  
Two Layer Model ◽  
Electrical Methods ◽  
Permafrost Mapping ◽  
Lateral Variations

The audiofrequency magnetotelluric (AMT) method has been used to study permafrost thickness near Tuktoyaktuk, N.W.T. in the Mackenzie Delta. In the frequency range of 10 Hz–10 kHz the permafrost behaves as a simple resistive layer over a conductive layer. This simple two-layer model can be inverted by asymptotic models to give a unique value for the thickness of the highly resistive frozen layer. In areas of simple layering, these results correlate well with drilling. In areas of sharp lateral variations in resistivity, depths tend to be underestimated. Unlike other electrical methods, AMT is not hampered by the presence of a surface melt layer in the summer if the conductivity–thickness product of this 'active layer' is less than about 0.03 mho (0.03 S).

scholarly journals Beach sands deposite identification using very low frequency method in the Benteng Lubuk, Krueng Raya coastal area

2021 ◽  
Vol 869 (1) ◽  
pp. 012058
Author(s):  
M Jannah ◽  
M Muhammad ◽  
Marwan ◽  
Z Jalil
Keyword(s):  
Sea Water ◽  
Low Frequency ◽  
High Resistivity ◽  
Conductive Layer ◽  
Inversion Process ◽  
Frequency Method ◽  
Sea Water Intrusion ◽  
Resistive Layer ◽  
Very Low Frequency ◽  
Beach Sands

Abstract The 2D subsurface identification work of iron sands in Benteng Lubuk, Krueng Raya was successfully studied using the very low frequency method based on resistivity mode (VLF-R). This study aims to identify iron sand deposits in coastal areas using electromagnetic inversion. The inversion process shows a conductivity zone of iron sand area, where the resistive layer is strongly covered by a conductive layer above it. High resistivity values were found at 80-100 m stations. This layer has a resistivity value between 20000 – 40000 m and the conductivity value tend to be low. It is estimated that at this point there will only be manifestations of iron sand or sea water intrusion, due to the location of the track close to the coastline.

scholarly journals Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

2018 ◽  
Vol 16 (2) ◽  
pp. 124 ◽  
Author(s):  
Asep Bayu Dani Nandiyanto ◽  
Heli Siti Halimatul Munawaroh ◽  
Tedi Kurniawan ◽  
Ahmad Mudzakir
Keyword(s):  
Physicochemical Properties ◽  
Physical Properties ◽  
Undergraduate Students ◽  
Tungsten Trioxide ◽  
Model Material ◽  
Effect Of Temperature ◽  
Water Molecules ◽  
Ammonium Ions ◽  
Experimental Procedure ◽  
Ammonium Tungstate

The purpose of this study was to investigate influences of temperature on the conversion of ammonium tungstate pentahydrate (ATP) powder to tungsten trioxide (WO3) particles with controllable sizes, crystallinities, and physicochemical properties. In this study, we used a simple thermal decomposition method. In the experimental procedure, we explored the effect of temperature on the physicochemical properties of ATP by testing various heating temperatures (from 100 to 900 °C). The heated ATP samples were then characterized by a physical observation (i.e. color) and various analysis methods (i.e. a thermal gravimetric and differential thermal analysis, infrared spectroscopy, an X-ray diffraction, and a scanning electron microscope). Experimental results showed that increases in temperature had an impact to the decreases in particle size, the change in material crystallinity, and the change in physical properties (e.g. change of color from white, orange, to yellowish green). The relationships between the reaction temperatures and the physicochemical properties of the ATP were also investigated in detail along with the theoretical consideration and the proposal of the WO3 particle formation mechanism. In simplification, the phenomena can be described into three zones of temperatures. (1) Below 250 °C (release of water molecules and some ammonium ions).; (2) At 250-400 °C (release of water molecules and ammonium ions, restructurization of tungsten and oxygen elements, and formation of amorphous tungsten trioxide). (3) At higher than 400 °C (crystallization of tungsten trioxide). Since ATP possessed reactivity on temperature, its physicochemical properties changing could be observed easily, and the experimental procedure could be done easily. The present study will benefit not only for “chemistry and material science” but also potentially to be used as a model material for explaining the thermal behavior of material to undergraduate students (suitable used for a class and laboratory experiment and demonstration).

Creating Mechanical Stress in the Resistive Layer as a Method of Studying its Temperature Characteristics

1985 ◽  
Vol 2 (2) ◽  
pp. 56-59
Author(s):  
D. Szymański ◽  
S. Achmatowicz ◽  
J. Bekisz ◽  
B. Szczytko
Keyword(s):  
Mechanical Stress ◽  
Resistive Layer ◽  
Temperature Characteristics

28.3: Projection CRT Electron Gun with High-Resistive-Layer Focus Lens

1998 ◽  
Vol 29 (1) ◽  
pp. 429 ◽  
Author(s):  
R. Murai ◽  
M. Aoki ◽  
M. Ohtani ◽  
K. Yamashita ◽  
T. Hiratani ◽  
...  
Keyword(s):  
Electron Gun ◽  
Resistive Layer

scholarly journals Evaluation of Inhomogeneous Resistive Layers by a Four Point Method

1981 ◽  
Vol 7 (4) ◽  
pp. 211-216
Author(s):  
György Fodor ◽  
Miklós Szilágyi ◽  
László Zombory
Keyword(s):  
Sheet Resistance ◽  
Point Method ◽  
Narrow Strip ◽  
Resistive Layer

This paper describes the determination of the sheet resistance of a narrow strip located in a homogeneous resistive layer of different resistivity. The application of the method for the evaluation of inhomogeneous layers used for thermoprinter head production is discussed.

Tunable Absorbers Based on an Electrically Controlled Resistive Layer

Plasmonics ◽  
2018 ◽  
Vol 14 (2) ◽  
pp. 327-333 ◽  
Author(s):  
Changlei Zhang ◽  
Cheng Huang ◽  
Mingbo Pu ◽  
Jiakun Song ◽  
Xiangang Luo
Keyword(s):  
Resistive Layer
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