| 单词 | Tc |
| 例句 | That was nowhere near room temperature, but warmer than the Tc for most superconducting materials. ‘Something is seriously wrong’: Room-temperature superconductivity study retracted 2022-09-26T04:00:00Z Also shown is a schematic of a Carnot engine operating between hot and cold reservoirs at temperatures Th and Tc . College Physics for AP Courses 2015-08-12T00:00:00Z After it is injected, the location of the technetium compound, and hence the damaged tissue, can be determined by detecting the γ rays emitted by the Tc-99 isotope. Chemistry 2019-02-14T00:00:00Z In addition, each Tc cell can kill more than one target cell, making them especially effective. Anatomy and Physiology 2013-06-19T00:00:00Z To confirm that a material superconducts, however, physicists also look for a second telltale indicator, known as the Meissner effect, in which the material expels magnetic fields below Tc. Breakthrough or bust? Claim of room-temperature superconductivity draws fire 2021-10-21T04:00:00Z The gold standard is to provide evidence of another key attribute of superconductors: their ability to expel an applied magnetic field when they cross Tc and become superconducting. ‘Something is seriously wrong’: Room-temperature superconductivity study retracted 2022-09-26T04:00:00Z Why do refrigerators, air conditioners, and heat pumps operate most cost-effectively for cycles with a small difference between Th and Tc ? College Physics for AP Courses 2015-08-12T00:00:00Z He adds that the apparent rise in magnetic susceptibility below Tc is an artifact. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Tc cells are so important in the antiviral immune response that some speculate that this was the main reason the adaptive immune response evolved in the first place. Anatomy and Physiology 2013-06-19T00:00:00Z In Dias’s Nature paper, CSH’s AC susceptibility dropped sharply at Tc, consistent with the interpretation that the material was expelling magnetic fields. Breakthrough or bust? Claim of room-temperature superconductivity draws fire 2021-10-21T04:00:00Z Dias and his colleagues thought they could push the Tc up even higher by adding a third element: carbon, which forms strong bonds with neighboring atoms. After decades, room temperature superconductivity achieved 2020-10-14T04:00:00Z Note that Table 32.1 lists many diagnostic uses for 99m Tc , where “m” stands for a metastable state of the technetium nucleus. College Physics for AP Courses 2015-08-12T00:00:00Z As superconductors are cooled below Tc, the voltage typically shows a drop. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z As more Tc cells are developed during an immune response, they overwhelm the ability of the virus to cause disease. Anatomy and Physiology 2013-06-19T00:00:00Z But the data also show that as the material cools below Tc, the AC susceptibility rises again. Breakthrough or bust? Claim of room-temperature superconductivity draws fire 2021-10-21T04:00:00Z The first astronomical source in which fullerene was detected was the star Tc 17. A fresh mechanism for how buckyballs form in space 2019-10-20T04:00:00Z The economic potential of perfect conductors saving electric energy is immense for Tc s above 77 K, since that is the temperature of liquid nitrogen. College Physics for AP Courses 2015-08-12T00:00:00Z To raise Tc and lower pressure, researchers need chemical recipes that either add a bunch of electrons to the hydrogen lattice or lock hydrogen into a stiffer lattice. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Tripartite Tc toxin complexes of bacterial pathogens perforate the host membrane and translocate toxic enzymes into the host cell, including in humans. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z The new setup produces Tc-99 with a medical cyclotron, thereby eliminating proliferation concerns. Nuclear Reactors Not Needed to Make the Most Common Medical Isotope 2012-02-20T17:59:50Z Tc is a fragment of about twenty-one verses between Matt. xiv. A Plain Introduction to the Criticism of the New Testament, Vol. I. 2011-06-30T02:00:27.850Z They are now called USOs or unidentified superconducting objects, out of frustration and the refusal of some samples to show high Tc even though produced in the same manner as others. College Physics for AP Courses 2015-08-12T00:00:00Z Over the next 3 years, Eremets and others boosted the Tc as high as 250 K in hydrides containing the heavy metal lanthanum. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Our results allow us to understand key steps of infections involving Tc toxins at the molecular level. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z In addition, many of the cyclotrons in the United States are not powerful enough to generate Tc-99. Nuclear Reactors Not Needed to Make the Most Common Medical Isotope 2012-02-20T17:59:50Z Let us represent it by T3; if the term “condensation of gases” is taken in the sense of “liquefaction of gases”—which is usually done—the condition for condensation is Tc > T > T3. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" High- Tc superconductors are more difficult to understand theoretically, but theorists seem to be closing in on a workable theory. College Physics for AP Courses 2015-08-12T00:00:00Z His group’s 2019 Nature Communications paper on a hydrogen sulfide superconductor contains a plot showing the Tc drops as an external magnetic field is increased, meaning the resistance flattens as expected for a superconductor. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Tc toxin complexes are virulence factors of many bacteria such as the plague pathogen Yersinia pestis and the insect pathogen Photorhabdus luminescens. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z The group previously used a high-energy medical cyclotron to produce Tc-99 from a stable isotope of molybdenum, known as Mo-100. Nuclear Reactors Not Needed to Make the Most Common Medical Isotope 2012-02-20T17:59:50Z If we confine ourselves to temperatures between Tc and T3, the gas will pass into a liquid if the pressure is sufficiently increased. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" The critical temperature Tc is the temperature below which a material is superconducting. College Physics for AP Courses 2015-08-12T00:00:00Z When an external magnetic field is applied to a superconductor, the Tc typically drops, with a greater drop for stronger magnetic fields. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z This might also explain the different host specificity of Tc toxins. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z The group is now working to maximize the amount of Tc-99 produced with this method. Nuclear Reactors Not Needed to Make the Most Common Medical Isotope 2012-02-20T17:59:50Z The highest pressure will therefore be found at Tc and the lowest at T3. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" It is also apparent that the greatest efficiencies are obtained when the ratio Tc / Th is as small as possible. College Physics for AP Courses 2015-08-12T00:00:00Z In a graph of temperature versus electrical resistance, the curve normally showing the drop in electrical resistance at Tc flattens out as the external field increases. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Extended Data Figure 8: Mechanism of action of Tc toxin complexes in insect hosts. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z Discoverers of high Tc may feel something analogous to what a politician once said upon an unexpected election victory—“I wonder what we did right?” College Physics for AP Courses 2015-08-12T00:00:00Z The values of Tc and pc for different substances will be found at the end of this article. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Heat transfer Qc occurs out of the working substance during the isothermal path CD, which takes place at constant temperature Tc . College Physics for AP Courses 2015-08-12T00:00:00Z In standard superconductors, magnetic susceptibility drops as the material is cooled below Tc and stays low as the temperature continues to drop. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z This file contains the Supplementary Discussion including a detailed description of the TcdB2-TccC3 structure and mechanism of action of Tc toxins, Supplementary references and Supplementary Table 1. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z The temperatures of the hot and cold reservoirs are Th and Tc , respectively. College Physics for AP Courses 2015-08-12T00:00:00Z This is the case with CO2, and we may in general expect it if the value of T3/Tc is large. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Perhaps 80 percent of all radiopharmaceutical procedures employ 99m Tc because of its many advantages. College Physics for AP Courses 2015-08-12T00:00:00Z Dias, however, reported that CSH’s magnetic susceptibility drops as the material cools below Tc but then rises again as cooling continues. Thanks to a bit of diamond smashing, practical superconductivity could be close to reality 2021-08-26T04:00:00Z Extended Data Figure 8: Mechanism of action of Tc toxin complexes in insect hosts. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z Carnot's interesting result implies that 100% efficiency would be possible only if Tc = 0 K —that is, only if the cold reservoir were at absolute zero, a practical and theoretical impossibility. College Physics for AP Courses 2015-08-12T00:00:00Z If Tc is but little above the Condensation of substances with low Tc. ordinary temperature, a great increase of pressure is in general required to effect condensation. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Certain other elements were also found to become superconductors, but all had Tc s less than 10 K, which are expensive to maintain. College Physics for AP Courses 2015-08-12T00:00:00Z Tc > 5⁄3 T0, occur as liquids, even without increase of pressure; that is, at the pressure of one atmosphere. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" A greater understanding requires knowledge of the structures of the Tc complex and its subunits in different states, that is, before and after membrane insertion. Mechanism of Tc toxin action revealed in molecular detail 2014-04-04T18:24:45.845Z The substances for which Tc is smaller than the ordinary temperature are but few in number. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Substances for which Tc is much higher than the ordinary temperature T0, e.g. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" High temperature superconductors have verifiable Tc s greater than 125 K, well above the easily achieved 77-K temperature of liquid nitrogen. College Physics for AP Courses 2015-08-12T00:00:00Z For substances having k great, h will be negative if T is low, positive if T rises, while it will change its sign again before Tc is reached. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" It differs greatly for different substances, and if we represent it by Tc, the condition for the condensation of a gas is that T must be below Tc. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" The lowest T which may be expected for air in a highly rarefied space may be evaluated at 60� absolute—a value which is higher than the Tc for hydrogen. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" |
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