scholarly journals Wire Melt Electrospinning of Thin Polymeric Fibers via Strong Electrostatic Field Gradients

2018 ◽  
Vol 304 (1) ◽  
pp. 1800417 ◽  
Author(s):  
Kai Morikawa ◽  
Aniruddh Vashisth ◽  
Christian J. Grimme ◽  
Micah J. Green ◽  
Mohammad Naraghi
Keyword(s):  
Electrostatic Field ◽  
Polymeric Fibers ◽  
Field Gradients ◽  
Melt Electrospinning

An arsenic-75 nuclear quadrupole resonance study of α and β As4S3

1972 ◽  
Vol 25 (11) ◽  
pp. 2291 ◽  
Author(s):  
TJ Bastow ◽  
ID Campbell ◽  
HJ Whitfield
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Nuclear Quadrupole Resonance ◽  
Electrostatic Field ◽  
Β Phase ◽  
Field Gradients ◽  
Α Phase ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The nuclear quadrupole resonance frequencies of 75As in the α and β forms of As4S3 have been measured at 77, 195, and 293 K. The frequencies at 77 K were: α phase 64.87 65.94 79.56 MHz β phase 65.42 67.16 79.65 MHz An analysis is presented in terms of Townes-Dailey theory and of the temperature dependence in terms of Bayer-Brown theory. The differences in frequencies of the α and β forms were attributed to the effect of electrostatic field gradients, estimated by lattice sums. Allowance must be made for the thermal expansion of the lattice to obtain a consistent interpretation.

Electrostatic field gradients in ionic crystals

1964 ◽  
Vol 17 (1) ◽  
pp. 1 ◽  
Author(s):  
CK Coogan
Keyword(s):  
Field Gradient ◽  
Electrostatic Field ◽  
Point Charge ◽  
Ionic Crystals ◽  
Point Charge Model ◽  
Boundary Shape ◽  
Field Gradients ◽  
Charge Model

The convergence of the sums arising in the calculation of the electrostatic field gradient in crystals is discussed. In the point charge model of ionic crystals convergence ensues for any boundary shape, and not only for spheres. The method outlined is applied to Cu2O and NaClO3, and agreement obtained with previous work. The advantages of this method of computation are outlined.

Nuclear magnetic resonance microscopy

1989 ◽  
Vol 47 ◽  
pp. 828-829
Author(s):  
Paul C. Lauterbur
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Signal To Noise ◽  
Field Gradients ◽  
Useful Signal ◽  
Magnetic Field Gradients ◽  
Observation Times ◽  
Nuclear Magnetic

Nuclear magnetic resonance imaging can reach microscopic resolution, as was noted many years ago, but the first serious attempt to explore the limits of the possibilities was made by Hedges. Resolution is ultimately limited under most circumstances by the signal-to-noise ratio, which is greater for small radio receiver coils, high magnetic fields and long observation times. The strongest signals in biological applications are obtained from water protons; for the usual magnetic fields used in NMR experiments (2-14 tesla), receiver coils of one to several millimeters in diameter, and observation times of a number of minutes, the volume resolution will be limited to a few hundred or thousand cubic micrometers. The proportions of voxels may be freely chosen within wide limits by varying the details of the imaging procedure. For isotropic resolution, therefore, objects of the order of (10μm) may be distinguished.Because the spatial coordinates are encoded by magnetic field gradients, the NMR resonance frequency differences, which determine the potential spatial resolution, may be made very large. As noted above, however, the corresponding volumes may become too small to give useful signal-to-noise ratios. In the presence of magnetic field gradients there will also be a loss of signal strength and resolution because molecular diffusion causes the coherence of the NMR signal to decay more rapidly than it otherwise would. This phenomenon is especially important in microscopic imaging.

Transient Response of Electrostatic Field due to Collision ESD between Spherical Electrodes by using Bare-chip Optical Electric Field Sensor

2020 ◽  
Vol 140 (12) ◽  
pp. 599-600
Author(s):  
Kento Kato ◽  
Ken Kawamata ◽  
Shinobu Ishigami ◽  
Ryuji Osawa ◽  
Takeshi Ishida ◽  
...  
Keyword(s):  
Electric Field ◽  
Transient Response ◽  
Electrostatic Field ◽  
Electric Field Sensor ◽  
Field Sensor

Electrostatic Field Distribution Measurement Using MEMS Micro-mirror Array

2014 ◽  
Vol 134 (12) ◽  
pp. 378-384 ◽  
Author(s):  
Toshihide Kuriyama ◽  
Wataru Takatsuji ◽  
Takaki Itoh ◽  
Hiroshi Maeda ◽  
Toshiyuki Nakaie ◽  
...  
Keyword(s):  
Field Distribution ◽  
Electrostatic Field ◽  
Distribution Measurement
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