scholarly journals A simple technique for measuring the transition temperature at microwave frequencies

1997 ◽  
Vol 7 (2) ◽  
pp. 1857-1860 ◽  
Author(s):  
J.M. Pond ◽  
L.H. Allen ◽  
E.J. Cukauskas
Keyword(s):  
Transition Temperature ◽  
Simple Technique ◽  
Microwave Frequencies

STUDIES ON ORIENTED DOMAIN POLYSTYRENE-TGS COMPOSITE FILMS

1995 ◽  
Vol 09 (17) ◽  
pp. 1039-1044
Author(s):  
S.C. MATHUR ◽  
D.S. RAWAT ◽  
H.O. YADAV ◽  
D.C. DUBE ◽  
A.S. BHALLA
Keyword(s):  
Dielectric Constant ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Domain Structure ◽  
Spontaneous Polarization ◽  
Coercive Field ◽  
Composite Films ◽  
Microwave Frequency ◽  
Ferroelectric Films ◽  
Microwave Frequencies

Polymer ferroelectric films were prepared by dispersing TGS powder in polystyrene. Permittivity versus temperature plots exhibit a peak at around the transition temperature of TGS. The peak gets suppressed with increasing frequency and the trend continues up to microwave frequencies. We observed that the dielectric constant of films at microwave frequency stays close to the dielectric constant of polystyrene. The domain structure of TGS crystals essentially seems to affect their dielectric properties. Single domain films exhibit a higher spontaneous polarization and a higher coercive field.

AN EFFICIENT METHOD OF DETERMINING SUPERCONDUCTING TRANSITION TEMPERATURE Tc

2005 ◽  
Vol 19 (05) ◽  
pp. 221-224
Author(s):  
DEHUA LIN ◽  
CHAORONG ZHONG ◽  
ZHIFENG LI ◽  
BINGQUAN HU ◽  
XINGANG WU ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Influencing Factors ◽  
Efficient Method ◽  
Superconducting Transition Temperature ◽  
Simple Technique ◽  
Transition Temperatures ◽  
Superconducting Transition

In this paper, by using simple technique we introduce an efficient method of determining superconducting transition temperatures in experiment, we have also figured out the main influencing factors on the accuracy of Tc measurement. We present a useful relationship and the calculating formulae. This method is suited to determine superconducting transition temperatures in superconductors at temperatures of liquid He as well.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

A Simple Technique for Obtaining a Colon Biopsy Specimen per Rectum

1962 ◽  
Vol 42 (2) ◽  
pp. 157-159 ◽  
Author(s):  
Eugene J. Gangarosa ◽  
William R. Beisel
Keyword(s):  
Biopsy Specimen ◽  
Simple Technique ◽  
Colon Biopsy

A SIMPLE TECHNIQUE FOR MEASUREMENT OF CORNEAL THICKNESS

1998 ◽  
Vol 21 (4) ◽  
pp. 109-114
Author(s):  
C Albarrán ◽  
R Montés-Micó ◽  
A M Pons ◽  
A Gené ◽  
A Lorente
Keyword(s):  
Simple Technique ◽  
Corneal Thickness

A SIMPLE QUALITATIVE DETERMINATION OF JOSEPHSON TUNNEL JUNCTION PARAMETERS NEAR THE TRANSITION TEMPERATURE

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1232-C6-1233 ◽  
Author(s):  
N. F. Pedersen ◽  
J. Mygind ◽  
O. H. Soerensen ◽  
B. Dueholm
Keyword(s):  
Transition Temperature ◽  
Tunnel Junction ◽  
Josephson Tunnel ◽  
Qualitative Determination
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