Direct current potentials

The Direct Current Potential Drop Method for Testing of Powder Metallurgical Parts. 

The Direct Current Potential Drop method (DCPD) has been evaluated for non destructive testing of uniaxially produced Powder Metallurgical (P/M) parts. The aim is to adapt DCPD to be functional as an ndt tool during production of parts. Defects can occur at different stages in the production cycle which means that DCPD has to be performed on components in different states and searching for different defects. 

Two parallel plates of conducting material separated by an insulation material, called the dielectric, constitutes an electrical condenser. The two plates may be electrically charged by connecting them to a source of direct current potential. The amount of electrical energy that can be stored in this manner is called the capacitance of the condenser, and is a function of the voltage, area of the plates, thickness of the dielectric, and the characteristic property of the dielectric material called dielectric constant. 

Quench Pulse A direct current potential applied to the trapping... 

A further electrical method, the use of which is restricted to film (and which indeed is little used at present) is the electro-contact treatment process proposed by Rothacker13 and described by Smith.8 In this, the film is passed over a metal roll and contacted by a number of free-rolling electrodes. A direct current potential difference is applied between the roll and the electrodes, and an a.c. voltage superimposed over the d.c. The flow of electrons thus induced brings... 

Nedergaard M. and Astrup J. (1986) Infarct rim effect of hyperglycemia on direct current potential and [14C]2-deoxyglucose phosphorylation. J. Cereb. Blood Flow Metab. 6, 607-615. 

When insulin was only in its second decade of medical use, it was developed, in desperation, into a therapy to attempt to alleviate the mental devastation wrought by schizophrenia. The therapy involved 30 min of hypoglycemic coma, or as it was then termed insulin coma (Sakel, 1937). Our present understanding of hypoglycemic coma allows us to conceive of spreading depression of Leao passing over the brain surface followed by complete loss of the direct current potential of the cerebral... 

Chem. Descrip. Poiar, iong-chain ester based on naturai raw materials Uses Conductivity aid for powd. coatings Features Avoids buiid-up of direct current potential Use Level 0.5-1.5% on finished paint Texicryl 13-002 [Scott Bader]... 

A void or bubble occurring in the center of a heavy thermoplastic part, usually caused by excessive shrinkage. The electrical resistance between opposite faces of a 1 cm cube of insulating material. It is measured under prescribed conditions using a direct current potential after a specified time of electrification. Also called specific insulation resistance (ASTM D257). 

M. Sluyters-Rehbach and J. H. Sluyters [1964a] On the Impedance of Galvanic Cells. IX. The double layer capacity of the mercury-M HC104 interface at high direct current potentials, Rec. Trav. Chim. Pays Bas 83, 217-222. 

Fig. 2.10. The quadrupole mass analyzer is an ion filtering device that creates an oscillating electric field between four rods, (a) Schematic of a quadrupole mass analyzer. -(L/+I/C0S (ot) and + U + 1/cos cot) are cumulative potential created by superimposed direct current potential U) and radiofrequency current potential (1/cos cot), (b) The encircled equation describes an area of stability for a particular m/z ion trajectory co = circular frequency to = field radius) depicted on the graph.

Uses Conductivity aid for powd. coalings welling agent for substrates Feafu/es Avoids build-up of direct current potential Regulatory Europe EINECS Canada DSL Australia AlCS Japan ENCS/MITI Properties Wh. to yellowish pearls dens. 0.910-0.930 60 C vise. 60-80 mPa-s 60 C m.p. 58-61 C ref. index 1.447-1,449 acid value 0-2.0 sapon. value 167-175 iodine value 0.-0.5 Use Level 0.5-1.5% on finished paint Toxicology TSCA listed... 

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