PrBa2Cu3Ox Polycrystalline Superconductor Preparation

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3278-3283 ◽  
Author(s):  
W. L. Hults ◽  
J. C. Cooley ◽  
E. J. Peterson ◽  
J. L. Smith ◽  
Howard A. Blackstead ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Partial Pressure ◽  
High Temperatures ◽  
Sintering Temperature ◽  
Weak Ferromagnetism ◽  
Electromagnetic Properties ◽  
Oxygen Level ◽  
Partial Pressure Of Oxygen ◽  
Preparation Conditions

We prepared many samples of nominal PrBa2Cu3O x as ceramic, polycrystalline pellets with an enormous variety of preparation conditions and can confirm its superconductivity at T c = 89 K. We found that the superconductivity is in material with the YBa2Cu3O7 (YBCO) crystal structure. We observed weak ferromagnetism (canted antiferromagnetism) in samples prepared at high temperatures with a low partial pressure of oxygen; these samples also contained the phase PrBaO3 . The electromagnetic properties of the material depend sensitively on preparation conditions, especially the sintering temperature and the oxygen level.

scholarly journals In vivo oxygen measurement in cerebrospinal fluid of pigs to determine physiologic and pathophysiologic oxygen values during CNS infections

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Nicole de Buhr ◽  
Alexander Martens ◽  
Marita Meurer ◽  
Marta C. Bonilla ◽  
Franz Söbbeler ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Ph Value ◽  
Cell Number ◽  
Bacterial Number ◽  
Oxygen Level ◽  
Partial Pressure Of Oxygen ◽  
Oxygen Levels ◽  
In Vivo Measurement ◽  
Cns Infections

AbstractDuring infection and inflammation, a reduced oxygen level clearly affects cellular functions. Oxygen levels during CNS infections are unknown. Here we established and evaluated an in vivo measurement system to characterize the oxygen level in parallel with bacterial numbers (CFU/mL), the cell number and pH level inside the CSF of healthy compared to Streptococcus suis-infected pigs. The animals were anesthetized over a seven-hour period with isoflurane in air/oxygen at physiologic arterial partial pressure of oxygen. Oxygen levels in CSF of anesthetized pigs were compared to euthanized pigs. The detected partial pressure of oxygen in the CSF remained constant in a range of 47–63 mmHg, independent of the infection status (bacterial or cell number). In contrast, the pH value showed a slight drop during infection, which correlated with cell and bacterial number in CSF. We present physiologic oxygen and pH values in CSF during the onset of bacterial meningitis.

scholarly journals The Physiological Action of Abnormally High Temperatures on Poikilotherm Animals

1940 ◽  
Vol 17 (4) ◽  
pp. 386-395
Author(s):  
G. S. FRAENKEL ◽  
G. V. B. HERFORD
Keyword(s):  
Oxygen Consumption ◽  
High Temperature ◽  
Partial Pressure ◽  
High Temperatures ◽  
Oxygen Pressure ◽  
Partial Pressure Of Oxygen ◽  
Waste Products ◽  
Physiological Action ◽  
Very High ◽  
Acid Waste

The oxygen consumption of blowfly larvae at sublethal and lethal high temperatures at the beginning of the determination is entirely dependent on the oxygen pressure, but after about 1 hr. at 42°C. it is higher at 20 and 10% partial pressure of oxygen than at either 100 or 5%. Death at high temperatures is not due to lack of oxygen, but may be due to the accumulation of acid waste products of the metabolism. The basal oxygen consumption remains unchanged for some time after the organism has been irreversibly injured by the high temperature. Blowfly larvae resist the damaging effect of high temperatures slightly better in air (20% oxygen) than in either very high (100%) or very low (less than 10%) concentrations of oxygen.

Interaction of H2O, O2 and H2 with Proton Conducting Oxides Based on Lanthanum Scandates

2019 ◽  
pp. 88-100
Author(s):  
A. S. Farlenkov ◽  
N. A. Zhuravlev ◽  
Т. A. Denisova ◽  
М. V. Ananyev
Keyword(s):  
Water Vapor ◽  
Partial Pressure ◽  
Gas Phase ◽  
Molecular Hydrogen ◽  
Proton Magnetic Resonance ◽  
Partial Pressure Of Oxygen ◽  
Proton Conducting ◽  
Conducting Oxides ◽  
Temperature Range ◽  
Apparent Level

The research uses the method of high-temperature thermogravimetric analysis to study the processes of interaction of the gas phase in the temperature range 300–950 °C in the partial pressure ranges of oxygen 8.1–50.7 kPa, water 6.1–24.3 kPa and hydrogen 4.1 kPa with La1–xSrxScO3–α oxides (x = 0; 0.04; 0.09). In the case of an increase in the partial pressure of water vapor at a constant partial pressure of oxygen (or hydrogen) in the gas phase, the apparent level of saturation of protons is shown to increase. An increase in the apparent level of saturation of protons of the sample also occurs with an increase in the partial pressure of oxygen at a constant partial pressure of water vapor in the gas phase. The paper discusses the causes of the observed processes. The research uses the hydrogen isotope exchange method with the equilibration of the isotope composition of the gas phase to study the incorporation of hydrogen into the structure of proton-conducting oxides based on strontium-doped lanthanum scandates. The concentrations of protons and deuterons were determined in the temperature range of 300–800 °C and a hydrogen pressure of 0.2 kPa for La0.91Sr0.09ScO3–α oxide. The paper discusses the role of oxygen vacancies in the process of incorporation of protons and deuterons from the atmosphere of molecular hydrogen into the structure of the proton conducting oxides La1–xSrxScO3–α (x = 0; 0.04; 0.09). The proton magnetic resonance method was used to study the local structure in the temperature range 23–110 °C at a rotation speed of 10 kHz (MAS) for La0.96Sr0.04ScO3–α oxide after thermogravimetric measurements in an atmosphere containing water vapor, and after exposures in molecular hydrogen atmosphere. The existence of proton defects incorporated into the volume of the investigated proton oxide from both the atmosphere containing water and the atmosphere containing molecular hydrogen is unambiguously shown. The paper considers the effect of the contributions of the volume and surface of La0.96Sr0.04ScO3–α oxide on the shape of the proton magnetic resonance spectra.

Biorhythm of the partial pressure of oxygen in uterine and fetal tissues

1981 ◽  
Vol 92 (4) ◽  
pp. 1305-1307
Author(s):  
A. Ya. Chizhov ◽  
V. G. Filimonov ◽  
Yu. M. Karash ◽  
R. B. Strelkov
Keyword(s):  
Partial Pressure ◽  
Partial Pressure Of Oxygen ◽  
Fetal Tissues

Singlet oxygen feedback delayed fluorescence of protoporphyrin IX in organic solutions

2017 ◽  
Vol 16 (4) ◽  
pp. 507-518 ◽  
Author(s):  
Ivo S. Vinklárek ◽  
Marek Scholz ◽  
Roman Dědic ◽  
Jan Hála
Keyword(s):  
Partial Pressure ◽  
Singlet Oxygen ◽  
Protoporphyrin Ix ◽  
Clinical Applications ◽  
Delayed Fluorescence ◽  
Diagnostic Tools ◽  
Partial Pressure Of Oxygen ◽  
High Concentrations ◽  
Organic Solutions

The PpIX DF show the significant role of SOFDF mechanism at high concentrations and at atmospheric partial pressure of oxygen and should be considered when developing diagnostic tools for clinical applications.

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