Computation, Visualization, and Chemistry of Electric Field-Enhanced Production of Ceramic Precursor Powders

1992 ◽  
Vol 271 ◽  
Author(s):  
Michael T. Harris ◽  
Warren G. Sisson ◽  
Osman A. Basaran
Keyword(s):  
Electric Field ◽  
Parallel Plate ◽  
The Other ◽  
Computational Results ◽  
Cylindrical Electrode ◽  
Parallel Plate Capacitor ◽  
Ceramic Precursor ◽  
Enhanced Production ◽  
The Stability ◽  
Precursor Powders

ABSTRACTThe stability of a liquid emanating from a nozzle is profoundly affected by an electric field. This electric-field induced instability is used here to form ceramic precursor powders having well-controlled particle-size distribution and morphology. Moreover, a hybrid boundary element/finite element method is used to determine the shapes and stability of a drop hanging from a nozzle. The efficiency of two different electrode configurations is considered: in one configuration, the nozzle is attached to the top plate of a parallel-plate capacitor and in the other, the nozzle is surrounded by a concentric cylindrical electrode. The computational results show that such pendant drops lose stability at turning points with respect to field strength. The experimental and computational results reported here are of importance not only in the development of electrodispersion apparatus, but in fields as diverse as capillarity and separations.

The bursting of soap-bubbles in a uniform electric field

1925 ◽  
Vol 22 (5) ◽  
pp. 728-730 ◽  
Author(s):  
C. T. R. Wilson ◽  
G. I. Taylor
Keyword(s):  
Electric Field ◽  
Water Drop ◽  
The Other ◽  
Uniform Electric Field ◽  
Geometrical Shape ◽  
Soap Bubble ◽  
Charged Drop ◽  
Mathematical Discussion ◽  
Mathematical Expressions ◽  
The Stability

The stability of a charged raindrop has been discussed mathematically by Lord Rayleigh. The case of an uncharged drop in a uniform electric field is perhaps of more meteorological importance but a mathematical discussion of the conditions for stability turns out to be very much more difficult in this case, owing to the fact that the drop ceases to be spherical before it bursts. Moreover it does not seem possible to express its geometrical shape by means of any simple mathematical expressions. On the other hand, by using a soap bubble instead of a water drop it was found possible to carry out experiments under well-defined conditions in this case, whereas experiments with Rayleigh's charged drop would be difficult.

scholarly journals Effects of Air Compression Between Parallel Plates in Interferometric and Capacitive Displacement Transducers

1967 ◽  
Vol 20 (5) ◽  
pp. 515
Author(s):  
JL Goldberg
Keyword(s):  
Parallel Plate ◽  
Precise Measurement ◽  
Displacement Transducer ◽  
Path Difference ◽  
The Other ◽  
Parallel Plates ◽  
Optical Interferometer ◽  
Parallel Plate Capacitor ◽  
Displacement Transducers ◽  
Air Compression

When one of two adjacent surfaces of a displacement transducer, such as a parallel plate capacitor or an optical interferometer, is moved towards the other the compression of air between the surfaces alters the dielectric constant and the refractive index of the air during the motion. In making a precise measurement of a transient displacement with one or other transducer not in vacuo, a correction to the measured value of capacitance or path difference may be necessary.

scholarly journals The interpretation of the results of Bucherer's experiments on e/m

1925 ◽  
Vol 107 (743) ◽  
pp. 544-560 ◽  
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Parallel Plate ◽  
High Speed ◽  
Uniform Magnetic Field ◽  
Mechanical Force ◽  
High Potential ◽  
The Other ◽  
Uniform Electric Field ◽  
Left Handed

Introduction .—In the ‘Physikalische Zeitschrift,’ 9 Jahrgang, No. 22 pp. 755-760, and again, in greater detail, in the 'Annalen der Physik,’ 1909 vol. 28, pp. 513-536, Prof. A. H. Bueherer gives an account of an experiment performed by him with the object of ascertaining which of the various mass formulæ attributed to the electron by theoretical physicists agrees best with experiment. The method is briefly as follows: a source of high speed electrons (a stick of radium fluoride) is fixed on the axis of a circular parallel plate con denser, one of whose plates is connected to earth, and the other to a source o: high potential so as to produce a sensibly uniform electric field in the region between. Perpendicular to the electric field is applied a uniform magnetic field whose effect is to diminish, or increase, the mechanical force on the electron according as the direction of its velocity forms a left-handed or a right-handed system with those of the two fields. Since the distance between the plates is very small compared with their radius, it follows that the velocity of projection of an electron cannot have at arbitrary value if it is to escape from the condenser. Given the direction of projection of an electron, its velocity must lie between two definite limits which depend upon the relative intensities of the two fields, and also upon the distant between the plates of the condenser.

Article

1998 ◽  
Vol 76 (4) ◽  
pp. 305-310
Author(s):  
W A van Wijngaarden ◽  
J Clarke
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Parallel Plate ◽  
Neutral Atom ◽  
Energy Minimum ◽  
Parallel Plate Capacitor ◽  
Atom Trap ◽  
Helmholtz Coils ◽  
Neutral Atom Trap ◽  
The Magnetic Field

A neutral atom trap is proposed consisting of a magnetic field generated by a pair of anti-Helmholtz coils and a fringing electric field of a parallel plate capacitor. The electric field shifts the energy minimum ofthe trap away from the point where the magnetic field is zero thus preventingatom loss from the trap due to Majorana transitions. This trap offers someadvantages over existing traps that are used to study cold atoms.PACS Nos.: 32.80Pj and 03.75Fi

scholarly journals Theories for triboelectric nanogenerators: A comprehensive review

2020 ◽  
Vol 9 (1) ◽  
pp. 610-625 ◽  
Author(s):  
He Zhang ◽  
Linjie Yao ◽  
Liwei Quan ◽  
Xianglong Zheng
Keyword(s):  
Electric Field ◽  
Parallel Plate ◽  
Low Cost ◽  
Parameter Analysis ◽  
Parallel Plate Capacitor ◽  
Time Saving ◽  
Theoretical Simulation ◽  
Plate Capacitor ◽  
Triboelectric Nanogenerators ◽  
The Impact

AbstractTriboelectric nanogenerators (TENGs) have attracted much attention as energy harvesting and sensor devices. Compared with experimental means, theoretical analysis is of low cost and time-saving for behavior prediction and structural optimization and is more powerful for understanding the working mechanism of TENGs. In this article, the theoretical system for performance simulation of TENGs has been reviewed systematically. The parallel-plate capacitor model, the distance-dependent electric field (DDEF) model, figures of merit (FOMs), and multi-parameter analysis are introduced. The parallel-plate capacitor model is the most fundamental model of TENGs, which is used to simulate the output of TENGs with planar configurations. For non-planar TENGs, the DDEF model is proposed, according to which the electric field is assumed to be distance-dependent rather than being uniform throughout the space. Further, to realize the standardization of TENGs, a series of FOMs are proposed as the standardized evaluation tools for TENGs’ output performance, which are used to reflect the influence of device parameters on the output from different aspects. Lastly, the multi-parameter analysis is introduced to consider the impact of multiple parameters on the output of TENGs simultaneously. These theories constitute the theoretical simulation system of TENGs, which could be used to guide the experimental work on TENGs and boost device optimization in commercial manufacturing.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

Enhanced performance of supercapacitors by constructing a “mini parallel-plate capacitor” in an electrode with high dielectric constant materials

2020 ◽  
Vol 8 (32) ◽  
pp. 16661-16668
Author(s):  
Huayao Tu ◽  
Shouzhi Wang ◽  
Hehe Jiang ◽  
Zhenyan Liang ◽  
Dong Shi ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Carbon Fiber ◽  
Parallel Plate ◽  
Sandwich Structure ◽  
High Dielectric Constant ◽  
Parallel Plate Capacitor ◽  
Plate Capacitor ◽  
Fiber Metal ◽  
High Dielectric ◽  
Mini Plate

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.

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