Definitions of specific electric resistance in horizontal wells

2018 ◽  
pp. 59-64
Author(s):  
A.P. Potapov ◽  
Keyword(s):  
Horizontal Wells ◽  
Electric Resistance ◽  
Specific Electric Resistance

Thermoelectric High Power Generating Module Made by n-Ba8AlxSi46-x Clathrate

2008 ◽  
Vol 1102 ◽  
Author(s):  
Shinji Munetoh ◽  
Makoto Arita ◽  
Hideki Makiyama ◽  
Teruaki Motooka
Keyword(s):  
Figure Of Merit ◽  
Open Circuit Voltage ◽  
Thermoelectric Module ◽  
Lithium Ion ◽  
Open Circuit ◽  
Electric Resistance ◽  
Thermoelectric Figure ◽  
Arc Melting ◽  
In Series ◽  
Specific Electric Resistance

AbstractWe have developed a new thermoelectric power-generating module composed of 72 pieces of n-type Ba8Al18Si28 clathrate elements made by arc melting. The Seebeck coefficient, specific electric resistance and thermal conductivity of Ba8Al18Si28 clathrate were 250 μV/K, 1.9 mΩcm and 3.1 W/mK at 500 °C, respectively, and the thermoelectric figure of merit (ZT) was 0.8. The new thermoelectric module was constructed using only n-type thermoelectric elements connected in series with hook-shaped electrodes. The open-circuit voltage of the module increased with hot-side temperature up to 1.8 V at 500 °C and generated 0.24 W. The module was successfully used to charge lithium-ion batteries for mobile phones.

Study of Wsi2 and Cosi2 Thin Films Deposited by Laser Ablation

1994 ◽  
Vol 354 ◽  
Author(s):  
V.G. Glebovsky ◽  
S.N. Ermolov ◽  
R.A. Oganyan ◽  
E.D. Stinov
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Elemental Composition ◽  
Refractory Metal ◽  
Liquid State ◽  
Electric Resistance ◽  
Cobalt Disilicide ◽  
X Ray ◽  
Specific Electric Resistance

AbstractIt has been shown, that pure massive targets of tungsten and cobalt disilicide can be obtain from the liquid state by means of a set of metallurgical methods. The conditions of laser ablation of the targets ensuring the preparation of tungsten and cobalt suicide films of the specific electric resistance 50 and 30 μΩ cm respectivly have been studied. The grazing beam X-ray difractometry were used to investigate their phase and elemental composition of the films. The method in question has been shown to be promising for the preparation of films of other refractory - metal suicides.

VIII. Magnetisation of iron

1885 ◽  
Vol 176 ◽  
pp. 455-469 ◽  
Keyword(s):  
Point Of View ◽  
Electric Resistance ◽  
Practical Applications ◽  
Absolute Measure ◽  
Limited Application ◽  
Specific Electric Resistance ◽  
Energy Dissipated ◽  
Satisfactory Theory ◽  
Residual Magnetism

The experimental determination of the relation between magnetisation and magnetising force, would be a simple matter if the expression of such relation were not complicated by the fact that the magnetisation depends not alone on the magnetising force at the instant, but also upon previous magnetising forces; in fact, if it were not complicated by the phenomena of residual magnetism. In the absence of any satisfactory theory, we can only experimentally attack particular cases, and the results obtained have only a limited application; for example, we may secure that the sample examined has never been submitted to greater magnetising force than that then operating, and we may determine a curve showing the relation of magnetisation to magnetising force when the latter is always increasing; we may also determine the residual magnetism when after each experiment the magnetising force has been removed. Such curves have been determined by Rowland (Phil. Mag., Aug., 1873) and others. For many purposes a more useful curve is one expressing the relation of the magnetising force and magnetisation when the former is first raised to a maximum and then let down to a defined point; such curves have been called descending curves. One or two descending curves are given in a paper by Mr. Shida (Proc. R. S., 1883, p. 404). It has been shown by Sir W. Thomson and others that the magnetisation of iron depends greatly upon the mechanical force to which the iron is at the time submitted. In the following experiments the samples were not intentionally submitted to any externally applied force. Clerk Maxwell gives in his 'Electricity and Magnetism,' chap. 6, vol. ii., a modification of Weber’s theory of induced magnetism, and from this he deduces, amongst other things, what had been already observed, that iron may be strongly magnetised and then completely demagnetised by a reversed force, but that it will not even then be in the condition of iron which has never been magnetised, but will be more easily affected by forces in one direction than in the other. This I have verified in several cases. The ordinary determinations of residual magnetisation are not applicable to determine the permanent magnetism which a piece of the material of suitable given form will retain after removal of external magnetising force, but, as will be shown, the descending curves which express the relation of magnetisa­tion and force, where these are diminishing, can be a t once used for this purpose. Such curves can also be used, as has been shown by Warburg and by Ewing (Report Brit. Assn., 1883), to determine the energy dissipated when the magnetisation of iron is reversed between given limits. That such dissipation must occur is clear, but some knowledge of its amount is important for some of the recent practical applications of electromagnetism. Probably Professor Ewing has made a more complete experimental study of magnetisation of iron than any one else. The researches of Professor Hughes should be mentioned here, as, although his results are not given in any absolute measure, his method of experiment is remarkable beyond all others for its beautiful simplicity. I have had great doubts whether it was desirable that I should publish my own experiments at all. My reason for deciding to offer them to the Royal Society is that a considerable variety of samples have been examined, that in nearly all cases I am able to give the composition of the samples, that the samples are substantial rods forged or cast and not drawn into wire, and that determinations of specific electric resistance have been made on these rods which have some interest from a practical point of view.

Specific Electric Resistance of Body Tissues

1961 ◽  
Vol 5 (4) ◽  
pp. 431-447 ◽  
Author(s):  
H C Burger ◽  
R van Dongen
Keyword(s):  
Electric Resistance ◽  
Body Tissues ◽  
Specific Electric Resistance

Reasons for low-resistant oil formations, criteria of their selection and productivity evaluation

2020 ◽  
pp. 9-14
Author(s):  
Kh.I. Shakarov ◽  
◽  
Kh.G. Mustafaeva ◽  
Keyword(s):  
Data Processing ◽  
Electric Resistance ◽  
Oil Saturation ◽  
Geophysical Surveys ◽  
Saturated Formations ◽  
Specific Electric Resistance ◽  
Geological Section ◽  
Soil Units ◽  
Definition Of ◽  
Selection Of

The paper reviews the issues of low-resistivity of oil-saturated formations and analyzes the studies carried out in this direction as well. The definition of specific electric resistance plays a significant role in the selection of reservoir-beds and the evaluation of their productivity. The analysis of the complex of downhole geophysical surveys conducted in Azerbaijan territory justifies that in some cases the geological section consists of the layering of formations with anisotropic properties varying by their resistance and permeability. Neglecting such aspects in the data processing and interpretation leads to the distortions. In the definition of oil saturation of soil units consisting of sand-clay interlayers’ alternation, it is practical to consider the anisotropic nature and comparisons “resistance correlations”.

Studies of Changes in the Electrical Resistivity of Rocks of the Tashtagol Mine in a Critical Rock-bump Hazardous State Based on the Kinetic Concept of Solids Destruction

2020 ◽  
pp. 19-25
Author(s):  
K.Kh. Lee ◽  
◽  
V.V. Ivanov ◽  
Keyword(s):  
Mechanical Loading ◽  
Electrical Resistance ◽  
Specific Electrical Resistance ◽  
Iron Ores ◽  
Electric Resistance ◽  
Limit States ◽  
Specific Electric Resistance ◽  
Iron Ore Deposit ◽  
Tashtagol Mine ◽  
Host Rocks

Main hypotheses of the occurrence of seismic events centers, including rock bumps are presented. Equations of kinetic theory of strength are given. A two-stage kinetic model of crack accumulation and catastrophic destruction of rocks is formulated. It consists in the fact that at the first stage of the rock bump preparation there is a diffuse accumulation of cracks, and at the second — merging of cracks, appearance of enlarged cracks and formation of the destruction center. The results are presented concerning the theoretical and laboratory measurements of change of specific electric resistance of the host rocks and ores of iron ore deposit at mechanical loading and destruction. It has been shown that the relative change of specific electrical resistance of the low conductive rocks depends significantly on the ratio of electrical resistance of the rock itself and charged zones near the surface of the incipient cracks during rock loading. With the accumulation of cracks in the process of mechanical loading of the host rocks of the Tashtagol mine, the number of charged point defects of the structure on the crack edges increases. Specific electrical resistance of such rocks decreases with the accumulation of the number of cracks. In the ore bodies and magnetic iron ores, on the contrary, with increasing disturbance, the electrical resistance increases. There is regular change in the electrical resistance of rocks in the intermediate and limit states. For ores and magnetic iron ores, the critical change is 40 %, and for the host rocks with high electrical resistance — 28–37 %. Obtained values of change of the specific electric resistance in the rock critical state can be used for prediction of the rock bumps.

scholarly journals Analysis of the results of thermal treatment of single crystals of silicon doped with boron impurity

2019 ◽  
Vol 1 (1) ◽  
pp. 77-80
Author(s):  
Panchenko O ◽  
Chervony I
Keyword(s):  
Heat Treatment ◽  
Single Crystals ◽  
Self Control ◽  
Matrix System ◽  
Electric Resistance ◽  
Technological Parameters ◽  
The Matrix ◽  
Specific Electric Resistance ◽  
Silicon Doped

Two groups of plastins of single-crystals of silicon doped with boron, were preliminary grown by the method of Chochralsky and thermally treat. Got values of specific electric resistance at different terms realizations of heat treatment served as a weekend by data. On the basis of the obtained experimental data were conducted: analysis of variance of the matrix system, estimation of results on the criterion of Cochren and Student. Built mathematical models. Determination of values of optimal technological parameters allowed objectively, taking into account influence of factors, to educe the maximum-possible circle of values for the receipt of necessary results. For basis accepted the change of temperature of heat treatment and time of self-control. All got experimental job performances are recreated and real at the construction of matrix of planning.

The Influence of Storage Conditions on the Electric Conductivity of Concrete

2019 ◽  
Vol 968 ◽  
pp. 50-60
Author(s):  
Andrii A. Plugin ◽  
Oleksii Pluhin ◽  
Olga Borziak ◽  
Olena Kaliuzhna
Keyword(s):  
Reinforced Concrete ◽  
Electric Conductivity ◽  
Storage Conditions ◽  
Research Data ◽  
Experimental Investigations ◽  
Electric Resistance ◽  
Objective Information ◽  
Moisture Treatment ◽  
Specific Electric Resistance

Theoretical and experimental investigations of the influence of concrete moisture, its age, holding conditions after its thermal moisture treatment and other factors on the specific electric resistance of the concrete of a C32/40 grade used for reinforced concrete sleepers have been carried out. The obtained research data allowed us to specify holding modes and the duration of them and these enable the generation of objective information on the specific electric resistance of the concrete used for the sleepers during their operation.

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