scholarly journals Temperature-dependent spectral function of a Kondo impurity in an s -wave superconductor

2019 ◽  
Vol 99 (17) ◽  
Author(s):  
Chenrong Liu ◽  
Yixuan Huang ◽  
Yan Chen ◽  
C. S. Ting
Keyword(s):  
Spectral Function ◽  
S Wave ◽  
Temperature Dependent

Temperature‐dependent propagation of P‐ and S‐waves in Cold Lake oil sands: Comparison of theory and experiment

Geophysics ◽  
1993 ◽  
Vol 58 (6) ◽  
pp. 863-872 ◽  
Author(s):  
John Eastwood
Keyword(s):  
Theoretical Model ◽  
Wave Velocity ◽  
Oil Sands ◽  
Seismic Wave Propagation ◽  
P Wave ◽  
S Wave ◽  
Temperature Dependent ◽  
S Waves ◽  
Fluid Properties ◽  
Cold Lake

The measured dependence of ultrasonic velocity in Cold Lake oil sands on temperature is compared to theoretical model predictions for seismic wave propagation in porous media. The experiments indicated that change in fluid properties with temperature most greatly affect observed velocities. The theoretical model was constructed to account for temperature dependent fluid properties using correlations independent of the ultrasonic experiments. Theoretical and experimental P‐wave velocities agree within 5 percent for temperatures between 22°C to 125°C and effective stresses of 1 MPa and 8 MPa. The modeling indicates that the change in fluid bulk modulus with temperature dominates the observed 15 percent P‐wave velocity decrease between 22°C to 125°C. Over the same temperature range the model predicts the S‐wave velocity remains almost constant (<1 percent increase).

scholarly journals Two-particle spectral function for disordered s -wave superconductors: Local maps and collective modes

2020 ◽  
Vol 101 (2) ◽  
Author(s):  
Abhisek Samanta ◽  
Amulya Ratnakar ◽  
Nandini Trivedi ◽  
Rajdeep Sensarma
Keyword(s):  
Spectral Function ◽  
Collective Modes ◽  
S Wave

scholarly journals Aspects of Optical Properties in Conventional and Oxide Superconductors

1997 ◽  
Vol 50 (6) ◽  
pp. 975 ◽  
Author(s):  
F. Marsiglio ◽  
J. P. Carbotte
Keyword(s):  
Inelastic Scattering ◽  
Oxide Superconductors ◽  
S Wave ◽  
Temperature Dependent ◽  
High Tc ◽  
The Real ◽  
Scattering Rate ◽  
Wave Symmetry ◽  
High Tc Cuprates ◽  
D Wave

We review the effect of elastic and inelastic scattering on the normal state infrared conductivity, and describe modifications to the real and imaginary parts which result from a transition to an s-wave superconducting state. The zero frequency limit of the imaginary part is related to the temperature-dependent penetration depth and, at finite frequency, provides information about the superconducting gap. In the high Tc cuprates the gap appears to have d-wave symmetry. This profoundly modifies both the real and the imaginary parts of the optical conductivity. After describing these modifications we introduce the conductivity-derived scattering rate, which directly probes the inelastic scattering processes, and is much larger in the oxides than in conventional superconductors. This quantity is also significantly modified by the d-wave symmetry of the gap.

Temperature-dependent electron-phonon spectral function and the intrinsic resistivity of a metal: A case study of monolayer Ti2N

2020 ◽  
Vol 102 (16) ◽  
Author(s):  
Binyuan Zhang ◽  
Mingfeng Zhu ◽  
Zhe Liu ◽  
Fei Guo ◽  
Yisong Zheng
Keyword(s):  
Spectral Function ◽  
Temperature Dependent

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

In Vitro Effects of Urokinase — Prevention by Different Inhibitors

1990 ◽  
Vol 64 (03) ◽  
pp. 402-406 ◽  
Author(s):  
M D Oethinger ◽  
E Seifried
Keyword(s):  
In Vitro Study ◽  
Thrombin Time ◽  
Plasma Samples ◽  
Temperature Dependent ◽  
Chloromethyl Ketone ◽  
Control Value ◽  
Dose Time ◽  
In Vitro Effects ◽  
Full Protection

SummaryThe present in vitro study investigated dose-, time- and temperature-dependent effects of two-chain urokinase plasminogen activato(u-PA, urokinase) on normal citrated plasma. When 10 μg/ml u-PA wereadded to pooled normal plasma and incubated for 30 min at an ambient temperature (25° C), α2-antiplas-min decreased to 8% of the control value. Incubation on ice yielded a decrease to 45% of control,whereas α2-antiplasmin was fully consumed at 37° C. Fibrinogen and plasminogen fell to 46% and 39%, respectively, after a 30 min incubation at 25° C. Thrombin time prolonged to 190% of control.Various inhibitors were studied with respect to their suitability and efficacy to prevent these in vitro effects. Aprotinin exhibited a good protective effect on fibrinogen at concentrations exceeding 500 KlU/ml plasma. Its use, however, was limited due to interferences with some haemostatic assays. We could demonstrate that L-Glutamyl-L-Glycyl-L-Arginyl chloromethyl ketone (GGACK) and a specific polyclonal anti-u-PA-antibody (anti-u-PA-IgG) effectively inhibited urokinase-induced plasmin generation without interfering with haemostatic assays. The anti-u-PA-antibody afforded full protection ofα2-antiplasmin at therapeutic levels of u-PA.It is concluded that u-PA in plasma samples from patients during thrombolytic therapy may induce in vitro effects which should be prevented by the use of a suitable inhibitor such as GGACK or specific anti-u-PA-antibody.

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