| 单词 | resistivity |
| 例句 | The fact that this was found by ERT — electrical resistivity tomography — and then confirmed by another technique, GPR — ground penetrating radar… Holocaust escape tunnel discovery a blow against deniers: “It was dug out by spoons. By people who were shackled around the ankles” 2016-06-29T04:00:00Z In 2021, she arranged for geographers and students from Christopher Newport University in Newport News, Va., to use ground-penetrating radar, electrical resistivity tomography and other technologies to peer under the earth at Jungfernhof. On Holocaust Remembrance Day, the U.N. Hears of a Little-Known Killing Field 2023-01-27T05:00:00Z We define the resistivity ρ of a substance so that the resistance R of an object is directly proportional to ρ . College Physics for AP Courses 2015-08-12T00:00:00Z But electrical resistivity imaging of the beach and seafloor shows that both were ice-free to at least 65 feet. Alaska’s permafrost, which stores greenhouse gases, is less plentiful and more fragile than believed, study says 2020-11-06T05:00:00Z The groups used electrical resistivity tomography to look for any voids. Sinkhole no longer poses danger, engineering study says 2020-08-06T04:00:00Z Such systems exhibit a minimum in a plot of resistivity against temperature, which is observed by Li et al. for NdNiO2. Superconductivity seen in a non-magnetic nickel oxide 2019-08-27T04:00:00Z At larger scales, this resistivity becomes a bigger problem, so commercial cells use electrode films that are more opaque — lowering efficiency. The reality behind solar power’s next star material 2019-06-24T04:00:00Z Conversely, the resistivity of conductors increases with increasing temperature. College Physics for AP Courses 2015-08-12T00:00:00Z During their week-long expedition to Jordan, Mol and her colleagues collected data on the surface hardness, resistivity and permeability of rocks, both at points of impact and undamaged rock. Geologists are measuring bullet damage to ancient Middle Eastern settlements 2018-12-02T05:00:00Z The team employed the electrical resistivity tomography system, also used in oil exploration, so as not to disturb any human remains at the site. WW2 Jewish escape tunnel uncovered in Lithuania's Ponar forest - BBC News 2016-06-29T04:00:00Z Electrical resistivity tomography is like an M.R.I. for the ground; it provides a clear picture of the subsurface. Escape Tunnel, Dug by Hand, Is Found at Holocaust Massacre Site 2016-06-29T04:00:00Z Typical monitored data are the body temperature, the animal activity, tissues resistivity, pulse and the GPS position. The Future Of Agriculture? Smart Farming 2015-02-18T05:00:00Z Since the atoms vibrate more rapidly and over larger distances at higher temperatures, the electrons moving through a metal make more collisions, effectively making the resistivity higher. College Physics for AP Courses 2015-08-12T00:00:00Z Modern techniques used to survey the land included magnetometry, earth resistance, ground penetrating radar and electric resistivity tomography, which uses electrodes to probe underground. Medieval city 'detected' by experts 2014-12-02T05:00:00Z Instruments in the “drill-string”—as formerly inflexible steel drill-shafts are now called—are meanwhile transmitting dozens of additional measurements: of the radioactivity of the surrounding rock, its resistivity to electromagnetic waves, and so on. Oilfield services: The unsung masters of the oil industry 2012-07-19T15:02:30Z Rather then excavate and disturb the remains, he and his team used two noninvasive tools — electrical resistivity tomography and ground penetrating radar. Escape Tunnel, Dug by Hand, Is Found at Holocaust Massacre Site 2016-06-29T04:00:00Z One issue is that as wires shrink to just nanometers in diameter, their resistivity tends to grow, curbing their usefulness as current carriers. Ohm Run: One-Atom-Tall Wires Could Extend Life of Moore's Law 2012-01-05T20:45:02.433Z The resistance between the rails is R , the rails and the moving rod are identical in cross section A and have the same resistivity ρ . College Physics for AP Courses 2015-08-12T00:00:00Z It varies a good deal in composition according to manufacture, and the resistivity of different specimens is not identical. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The entire matter resolves itself into one of individual tolerance, resistivity, and constitution. All About Coffee I wished to ascertain whether the resistivity of the red blood-corpuscles in a healthy man could be lowered by the consumption of alcohol. Alcohol: A Dangerous and Unnecessary Medicine, How and Why What Medical Writers Say "As we change the width of the wire, the resistivity remains the same," she says. Ohm Run: One-Atom-Tall Wires Could Extend Life of Moore's Law 2012-01-05T20:45:02.433Z No exact numerical data have been obtained, but the resistivity must certainly be of the same order as that of pure sulphur at its best. On Laboratory Arts The resistivity of substances is then numerically expressed by stating the resistance of one cubic centimetre of the substance taken between opposed faces, and expressed in ohms, microhms or megohms, as may be most convenient. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The exact correlative terms are resistance and conductance, resistivity and conductivity. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. So also the modifications which the phenomena of magnetic hysteresis or the variations of resistivity have just demonstrated. The New Physics and Its Evolution The volume resistivity of alloys is, generally speaking, much higher than that of pure metals. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Table V. shows the volume resistivity at 0� C. of a number of well-known alloys, with their chemical composition. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The absolute unit of conductivity is the conductivity of a substance whose resistivity is one absolute C.G.S. unit, or one-thousandth-millionth part of an ohm. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Some pure metals when alloyed with a small proportion of another metal do not suffer much 858 change in resistivity, but in other cases the resultant alloy has a much higher resistivity. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The presence of a very small proportion of a non-metallic element in a metallic mass, such as oxygen, sulphur or phosphorus, has a very great effect in increasing the resistivity. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Certain metallic elements also have the same power; thus platinoid has a resistivity 30% greater than German silver, though it differs from it merely in containing a trace of tungsten. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The resistivity of non-metallic conductors is in all cases higher than that of any pure metal. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Very small differences in density and in chemical purity make, however, immense differences in electric resistivity; hence the values given by different experimentalists for the resistivity of known metals differ to a considerable extent. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" At and beyond this temperature increased heating appears to increase their resistivity; this phenomenon may, however, be accompanied by a molecular change and not be a true temperature variation. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" In the case of dielectric conductors and of electrolytes, the action of rising temperature is to reduce resistivity. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Many of the so-called insulators, such as mica, ebonite, indiarubber, and the insulating oils, paraffin, &c., decrease in resistivity with great rapidity as the temperature rises. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" In all cases the relation between the resistivity of a substance and the temperature is best set out in the form of a curve called a temperature-resistance curve. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Subsequently numerous determinations of the resistivity of various pure metals were made by Fleming and Dewar, whose results are set out in Table III. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The resistivity curves of the magnetic metals are also remarkable for the change of curvature they exhibit at the magnetic critical temperature. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The changes in the curvature of the resistivity curves are undoubtedly connected with the molecular changes that occur in the magnetic metals at their critical temperatures. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" A fact of considerable interest in connexion with resistivity is the influence exerted by a strong magnetic field in the case of some metals, notably bismuth. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" In the Absolute Methods the resistivity is determined without reference to any other substance, but with reference only to the fundamental standards of length, mass and time. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Resistivity of Copper.—In connexion with electro-technical work the determination of the conductivity or resistivity values of annealed and hard-drawn copper wire at standard temperatures is a very important matter. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" |
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