Effect of plasma discharge on structure of epidermal layer of pig skin

1969 ◽

Vol 27 ◽

pp. 46-47

Author(s):

Emil Bernstein

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Great Depth ◽

Hair Follicles ◽

Depth Of Field ◽

Pig Skin ◽

Realistic Picture ◽

Main Components ◽

Scanning Electron

An interesting method for examining structures in g. pig skin has been developed. By modifying an existing technique for splitting skin into its two main components—epidermis and dermis—we can in effect create new surfaces which can be examined with the scanning electron microscope (SEM). Although this method is not offered as a complete substitute for sectioning, it provides the investigator with a means for examining certain structures such as hair follicles and glands intact. The great depth of field of the SEM complements the technique so that a very “realistic” picture of the organ is obtained.

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POSITIVE COLUMN CONSTRICTION IN CESIUM PLASMA DISCHARGE

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1979767 ◽

1979 ◽

Vol 40 (C7) ◽

pp. C7-137-C7-138

Author(s):

G. Musa ◽

A. Popescu ◽

N. Niculescu

Keyword(s):

Positive Column ◽

Plasma Discharge ◽

Cesium Plasma

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REDUCED MODEL OF PLASMA DISCHARGE CONTROL IN TOKAMAK WITH IRON CORE

Computational nanotechnology ◽

10.33693/2313-223x-2020-7-3-11-22 ◽

2020 ◽

Vol 7 (3) ◽

pp. 11-22

Author(s):

VALERY ANDREEV ◽

◽

ALEXANDER POPOV

Keyword(s):

Optimal Control ◽

Inverse Problem ◽

Optimal Control Problem ◽

Control Problem ◽

Nonlinear Behavior ◽

Plasma Discharge ◽

Reduced Model ◽

Iron Core ◽

Power Sources ◽

Real Power

A reduced model has been developed to describe the time evolution of a discharge in an iron core tokamak, taking into account the nonlinear behavior of the ferromagnetic during the discharge. The calculation of the discharge scenario and program regime in the tokamak is formulated as an inverse problem - the optimal control problem. The methods for solving the problem are compared and the analysis of the correctness and stability of the control problem is carried out. A model of “quasi-optimal” control is proposed, which allows one to take into account real power sources. The discharge scenarios are calculated for the T-15 tokamak with an iron core.

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SYNTHESIS OF HYDROGEN IN ACOUSTOPLASMA DISCHARGE IN A LIQUID-PHASE STREAM

Alternative Energy and Ecology (ISJAEE) ◽

10.15518/isjaee.2019.01-03.042-048 ◽

2019 ◽

pp. 42-48 ◽

Cited By ~ 2

Author(s):

N. A. Bulychev

Keyword(s):

Liquid Phase ◽

Organic Compounds ◽

Electrode Materials ◽

Solid Phase ◽

Plasma Discharge ◽

Raw Material ◽

Two Phase ◽

Reduced Pressure ◽

External Power Source ◽

Phase Medium

In this paper, the plasma discharge in a high-pressure fluid stream in order to produce gaseous hydrogen was studied. Methods and equipment have been developed for the excitation of a plasma discharge in a stream of liquid medium. The fluid flow under excessive pressure is directed to a hydrodynamic emitter located at the reactor inlet where a supersonic two-phase vapor-liquid flow under reduced pressure is formed in the liquid due to the pressure drop and decrease in the flow enthalpy. Electrodes are located in the reactor where an electric field is created using an external power source (the strength of the field exceeds the breakdown threshold of this two-phase medium) leading to theinitiation of a low-temperature glow quasi-stationary plasma discharge.A theoretical estimation of the parameters of this type of discharge has been carried out. It is shown that the lowtemperature plasma initiated under the flow conditions of a liquid-phase medium in the discharge gap between the electrodes can effectively decompose the hydrogen-containing molecules of organic compounds in a liquid with the formation of gaseous products where the content of hydrogen is more than 90%. In the process simulation, theoretical calculations of the voltage and discharge current were also made which are in good agreement with the experimental data. The reaction unit used in the experiments was of a volume of 50 ml and reaction capacity appeared to be about 1.5 liters of hydrogen per minute when using a mixture of oxygen-containing organic compounds as a raw material. During their decomposition in plasma, solid-phase products are also formed in insignificant amounts: carbon nanoparticles and oxide nanoparticles of discharge electrode materials.

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Histological aspects of the cryopreservation of potato

Acta Agronomica Hungarica ◽

10.1556/aagr.56.2008.3.10 ◽

2008 ◽

Vol 56 (3) ◽

pp. 341-348

Author(s):

P. Pepó ◽

A. Kovács

Keyword(s):

Cell Wall ◽

Low Temperatures ◽

Cell Walls ◽

Cellular Level ◽

Adaptive Mechanism ◽

Epidermal Layer ◽

Freezing And Thawing ◽

Meristematic Cells ◽

Suitable Solution ◽

Vacuolated Cells

Cryopreservation appears to be a suitable solution for the maintenance of potato germplasms. The protocol described in this paper can be applied for the vitrification and preservation of meristems. During histo-cytological studies it is possible to observe modifications at the cellular level and to understand the adaptive mechanism to low temperatures. Control potato meristem tissue contained a number of meristematic cells with a gradient of differentiation. After freezing there were a large number of vacuolated cells, some of which exhibited broken cell walls and plasmolysis. The thickening of the cell wall, giving them a sinuous appearance, was observed after freezing and thawing the meristems, with ruptures of the cuticle and epidermal layer.

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