scholarly journals Space-based Ionosonde Receiver and Visible Limb-viewing Airglow Sensor (SIRVLAS): A CubeSat instrument suite for enhanced ionospheric charge density measurements

2020 ◽  
Author(s):  
Sujay Swain ◽  
Benjamin Cohen ◽  
Ryan He ◽  
Michael Ille ◽  
Ishaan Shrestha ◽  
...  
Keyword(s):  
Charge Density ◽  
Density Measurements

Characterisation of natural organic matter (NOM) removed by magnetic ion exchange resin (MIEX® Resin)

2009 ◽  
Vol 9 (2) ◽  
pp. 199-205 ◽  
Author(s):  
M. R. D. Mergen ◽  
B. J. Adams ◽  
G. M. Vero ◽  
T. A. Price ◽  
S. A. Parsons ◽  
...  
Keyword(s):  
Charge Density ◽  
Natural Organic Matter ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Low Molecular Weight ◽  
Raw Water ◽  
Density Measurements ◽  
Organic Species ◽  
Magnetic Ion ◽  
Insight Into

The aim of the research presented in this paper was to gain greater insight into the characteristics of NOM removed by MIEX® Resin. Previous studies have shown that MIEX® Resin increases the level of removable DOC when used in combination with coagulation, suggesting that these two processes target a different type of organics. Initially the characteristics of DOC in regenerant solutions from four different MIEX® Resin treatment plants were analysed and compared to DOC in the respective raw water. Following this the raw water and the regenerant solutions were coagulated and the characteristics of the residual DOC analysed and compared to the regenerant solutions prior to coagulation. From the regenerant solutions it was seen that MIEX® Resin targets DOC of increased UV254 absorbance, increased charge density and of mid to low molecular weight (5 to 2 kDa). In terms of hydrophobicity no preference of MIEX® Resin for a specific NOM type was seen. The presence of hydrophilic neutral acids in the regenerant solution was unexpected since the removal of only highly charged organic species was expected. Charge density measurements however revealed the presence of functional groups, allowing hydrophilic neutrals to be removed by anion exchange. Comparative coagulation of the raw water and regenerant solution showed that both a residual DOC of similar hydrophobicity in the sub 3 kDa area. Considering that this DOC fraction was present in the regenerant it was concluded that MIEX® Resin removes organics recalcitrant to coagulation from raw water and therefore increases DOC removal when both methods are combined.

scholarly journals Three dimensional charge density measurements at surfaces

2005 ◽  
Vol 61 (a1) ◽  
pp. c96-c96 ◽  
Author(s):  
R. Feidenhans'l ◽  
O. Bunk ◽  
J. Ciston ◽  
L. D. Marks
Keyword(s):  
Charge Density ◽  
Three Dimensional ◽  
Density Measurements

scholarly journals Simulations of 3D charge density measurements for commissioning of the PolariX-TDS

2018 ◽  
Vol 1067 ◽  
pp. 072012 ◽  
Author(s):  
D Marx ◽  
R Assmann ◽  
R D’Arcy ◽  
B Marchetti
Keyword(s):  
Charge Density ◽  
Density Measurements

A passive probe for electrostatic charge density measurements

1990 ◽  
Vol 61 (11) ◽  
pp. 3416-3420 ◽  
Author(s):  
Ioannis N. Miaoulis ◽  
Behrouz Abedian
Keyword(s):  
Charge Density ◽  
Electrostatic Charge ◽  
Density Measurements

Oscillating probe for charge density measurements

1976 ◽  
Vol 2 (1) ◽  
pp. 91-95 ◽  
Author(s):  
F. Nordhage ◽  
G. Bäckström
Keyword(s):  
Charge Density ◽  
Density Measurements

Surface charge density measurements with a controlled growth mercury electrode

1996 ◽  
Vol 8 (8-9) ◽  
pp. 742-747 ◽  
Author(s):  
John J. O'Dea ◽  
Malgorzata Ciszkowska ◽  
Robert A. Osteryoung
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Mercury Electrode ◽  
Controlled Growth ◽  
Density Measurements

The Influence of Microstructure on the Surface Charge of Sintered Hydroxyapatite Ceramics

2019 ◽  
Vol 800 ◽  
pp. 25-29
Author(s):  
Darta Ubele ◽  
Liene Pluduma ◽  
Karlis Agris Gross
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Bone Ingrowth ◽  
Surface Charges ◽  
Depolarization Current ◽  
Density Measurements ◽  
Electrical Polarization ◽  
Hydroxyapatite Ceramics ◽  
A Charge ◽  
Thermally Stimulated Depolarization

Hydroxyapatite (HAp) has shown the ability to store a charge induced by electrical polarization a method potential for improved bone ingrowth. In this work electrical polarization was carried out on HAp ceramics with three different microstructures, obtained at three different sintering temperatures. Microstructure of the sintered HAp was evaluated from density measurements and SEM observations. Sintered HAp tablets were electrically polarized in an electric field of 5 kV/cm at 400 °C for 1h. Surface charges investigated by thermally stimulated depolarization current measurements showed 104,8 μC/cm2 for denser tablets, while charge density of 22,8 μC/cm2 was obtained for less dense tablets.

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