The Experts below are selected from a list of 36594 Experts worldwide ranked by ideXlab platform
Jianda Shao - One of the best experts on this subject based on the ideXlab platform.
-
influences of Oxygen Partial Pressure on structure and related properties of zro2 thin films prepared by electron beam evaporation deposition
Applied Surface Science, 2007Co-Authors: Yanming Shen, Zhengxiu Fan, Shuying Shao, Jianda ShaoAbstract:Abstract ZrO2 thin films were prepared by electron beam evaporation at different Oxygen Partial Pressures. The influences of Oxygen Partial Pressure on structure and related properties of ZrO2 thin films were studied. Transmittance, thermal absorption, structure and residual stress of ZrO2 thin films were measured by spectrophotometer, surface thermal lensing technique (STL), X-ray diffraction and optical interferometer, respectively. The results showed that the structure and related properties varied progressively with the increase of Oxygen Partial Pressure. The refractive indices and the packing densities of the thin films decreased when the Oxygen Partial Pressure increased. The tetragonal phase fraction in the thin films decreased gradually as Oxygen Partial Pressure increased. The residual stress of film deposited at base Pressure was high compressive stress, the value decreased with the increase of Oxygen Partial Pressure, and the residual stress became tensile with the further increase of Oxygen Pressure, which was corresponding to the evolution of packing densities and variation of interplanar distances.
-
influences of Oxygen Partial Pressure on structure and related properties of zro2 thin films prepared by electron beam evaporation deposition
Applied Surface Science, 2007Co-Authors: Yanming Shen, Zhengxiu Fan, Shuying Shao, Jianda ShaoAbstract:ZrO2 thin films were prepared by electron beam evaporation at different Oxygen Partial Pressures. The influences of Oxygen Partial Pressure on structure and related properties of ZrO2 thin films were studied. Transmittance, thermal absorption, structure and residual stress of ZrO2 thin films were measured by spectrophotometer, surface thermal lensing technique (STL), X-ray diffraction and optical interferometer, respectively. The results showed that the structure and related properties varied progressively with the increase of Oxygen Partial Pressure. The refractive indices and the packing densities of the thin films decreased when the Oxygen Partial Pressure increased. The tetragonal phase fraction in the thin films decreased gradually as Oxygen Partial Pressure increased. The residual stress of film deposited at base Pressure was high compressive stress, the value decreased with the increase of Oxygen Partial Pressure, and the residual stress became tensile with the further increase of Oxygen Pressure, which was corresponding to the evolution of packing densities and variation of interplanar distances. (c) 2007 Elsevier B.V. All rights reserved.
-
effects of Oxygen Partial Pressure on packing density and laser damage threshold of tio2 thin films
Journal of Applied Physics, 2007Co-Authors: Yuanan Zhao, Hongbo He, Jianda ShaoAbstract:TiO2 films are deposited by electron beam evaporation as a function of Oxygen Partial Pressure. The packing density, refractive index, and extinction coefficient all decrease with the increase of Pressure, which also induces the change of the film’s microstructure, such as the increase of voids and H2O concentration in the film. The laser-induced damage threshold (LIDT) of the film increases monotonically with the rise of Pressure in this experiment. The porous structure and low nonstoichiometric defects absorption contribute to the film’s high LIDT. The films prepared at the lowest and the highest Pressure show nonstoichiometric and surface-defects-induced damage features, respectively.
-
Effects of Oxygen Partial Pressure on optical absorption edge and UV emission energy of ZnO films
Chinese Optics Letters, 2005Co-Authors: Ruijin Hong, Jianda Shao, Zhengxiu FanAbstract:The optical absorption edge and ultraviolet (UV) emission energy of ZnO films deposited by direct current (DC) reactive magnetron sputtering at room temperature have been investigated. With the Oxygen ratio increasing, the structure of films changes from zinc and zinc oxide coexisting phase to single-phase ZnO and finally to the highly (002) orientation. Both the grain size and the stress of ZnO film vary with the Oxygen Partial Pressure. Upon increasing the Oxygen Partial Pressure in the growing ambient, the visible emission in the room-temperature photoluminescence spectra was suppressed without sacrificing the band-edge emission intensity in the ultraviolet region. The peaks of photoluminescence spectra were located at 3.06---3.15 eV. From optical transmittance spectra of ZnO films, the optical band gap edge was observed to shift towards shorter wavelength with the increase of Oxygen Partial Pressure.
Giles E Santyr - One of the best experts on this subject based on the ideXlab platform.
-
measurement of alveolar Oxygen Partial Pressure in the rat lung using carr purcell meiboom gill spin spin relaxation times of hyperpolarized 3he and 129xe at 74 mt
Magnetic Resonance in Medicine, 2010Co-Authors: Ryan J Kraayvanger, C P Bidinosti, William Dominguezviqueira, Juan Parrarobles, Matthew S Fox, Wilfred W Lam, Giles E SantyrAbstract:Regional measurement of alveolar Oxygen Partial Pressure can be obtained from the relaxation rates of hyperpolarized noble gases, (3) He and (129) Xe, in the lungs. Recently, it has been demonstrated that measurements of alveolar Oxygen Partial Pressure can be obtained using the spin-spin relaxation rate (R(2) ) of (3) He at low magnetic field strengths (<0.1 T) in vivo. R(2) measurements can be achieved efficiently using the Carr-Purcell-Meiboom-Gill pulse sequence. In this work, alveolar Oxygen Partial Pressure measurements based on Carr-Purcell-Meiboom-Gill R(2) values of hyperpolarized (3) He and (129) Xe in vitro and in vivo in the rat lung at low magnetic field strength (74 mT) are presented. In vitro spin-spin relaxivity constants for (3) He and (129) Xe were determined to be (5.2 ± 0.6) × 10(-6) Pa(-1) sec(-1) and (7.3 ± 0.4) × 10(-6) Pa(-1) s(-1) compared with spin-lattice relaxivity constants of (4.0 ± 0.4) × 10(-6) Pa(-1) s(-1) and (4.3 ± 1.3) × 10(-6) Pa(-1) s(-1), respectively. In vivo experimental measurements of alveolar Oxygen Partial Pressure using (3) He in whole rat lung show good agreement (r(2) = 0.973) with predictions based on lung volumes and ventilation parameters. For (129) Xe, multicomponent relaxation was observed with one component exhibiting an increase in R(2) with decreasing alveolar Oxygen Partial Pressure.
Xiaobin Shi - One of the best experts on this subject based on the ideXlab platform.
-
oxidation behaviour of zirconium diboride silicon carbide ceramic composites under low Oxygen Partial Pressure
Corrosion Science, 2011Co-Authors: Chengyi Tian, Dong Gao, Yue Zhang, Yang Song, Xiaobin ShiAbstract:Abstract The oxidation behaviour of ZrB 2 -based ceramics under low Oxygen Partial Pressure ranged from 0.5 to 1.5 kPa was investigated. Low Oxygen Partial Pressure was found to have remarkable effect on phase composition of the surface and the structures of oxide scale. And the thickness and microstructures of oxide scale was characterized by using scanning electron microscopy and X-ray diffraction analysis. The results indicate that the oxidation mechanism of ZrB 2 -based ceramics changes under low Oxygen Partial Pressure, and the oxidation resistance increases with the reduction of Oxygen Partial Pressure.
-
oxidation of zirconium diboride silicon carbide ceramics under an Oxygen Partial Pressure of 200 pa formation of zircon
Corrosion Science, 2010Co-Authors: Dong Gao, Yue Zhang, Yang Song, Xiaobin ShiAbstract:Abstract The formation and evolution of zircon during oxidation of ZrB 2 –20 vol.% SiC ceramics under a low Oxygen Partial Pressure of 200 Pa is studied. The formation mechanism of zircon is proposed according to experimental results and thermodynamic consideration. And the main reason to the formation of zircon can be attributed to the active oxidation of SiC. Two steps can be divided for the formation and evolution of zircon: (1) nucleation from silica glass; and (2) crystal growth into prism like particles. Furthermore, the emergence of zircon significantly improves the oxidation resistance performance.
Zhengxiu Fan - One of the best experts on this subject based on the ideXlab platform.
-
influence of Oxygen Partial Pressure on laser induced damage resistance of zro2 films in vacuum
Vacuum, 2015Co-Authors: Xiulan Ling, Xiaofeng Liu, Gao Wang, Zhengxiu FanAbstract:Abstract The dependence of laser-induced damage resistance of ZrO2 films in vacuum on Oxygen Partial Pressure has been studied. Results revealed that laser-induced damage resistance of ZrO2 films in vacuum had a complicated dependent relationship with the Oxygen Partial Pressure. And higher laser-induced damage threshold under the Oxygen Partial Pressure of 1.0 × 10−2 Pa was a result of the combination effect of many factors, such as optical characteristics, structural property and stress property. Study indicated that reasonable process parameter being capable of balancing effectively the adverse and favorable factors was very necessary for preparing optical films with high laser-induced damage threshold in vacuum.
-
influences of Oxygen Partial Pressure on structure and related properties of zro2 thin films prepared by electron beam evaporation deposition
Applied Surface Science, 2007Co-Authors: Yanming Shen, Zhengxiu Fan, Shuying Shao, Jianda ShaoAbstract:ZrO2 thin films were prepared by electron beam evaporation at different Oxygen Partial Pressures. The influences of Oxygen Partial Pressure on structure and related properties of ZrO2 thin films were studied. Transmittance, thermal absorption, structure and residual stress of ZrO2 thin films were measured by spectrophotometer, surface thermal lensing technique (STL), X-ray diffraction and optical interferometer, respectively. The results showed that the structure and related properties varied progressively with the increase of Oxygen Partial Pressure. The refractive indices and the packing densities of the thin films decreased when the Oxygen Partial Pressure increased. The tetragonal phase fraction in the thin films decreased gradually as Oxygen Partial Pressure increased. The residual stress of film deposited at base Pressure was high compressive stress, the value decreased with the increase of Oxygen Partial Pressure, and the residual stress became tensile with the further increase of Oxygen Pressure, which was corresponding to the evolution of packing densities and variation of interplanar distances. (c) 2007 Elsevier B.V. All rights reserved.
-
influences of Oxygen Partial Pressure on structure and related properties of zro2 thin films prepared by electron beam evaporation deposition
Applied Surface Science, 2007Co-Authors: Yanming Shen, Zhengxiu Fan, Shuying Shao, Jianda ShaoAbstract:Abstract ZrO2 thin films were prepared by electron beam evaporation at different Oxygen Partial Pressures. The influences of Oxygen Partial Pressure on structure and related properties of ZrO2 thin films were studied. Transmittance, thermal absorption, structure and residual stress of ZrO2 thin films were measured by spectrophotometer, surface thermal lensing technique (STL), X-ray diffraction and optical interferometer, respectively. The results showed that the structure and related properties varied progressively with the increase of Oxygen Partial Pressure. The refractive indices and the packing densities of the thin films decreased when the Oxygen Partial Pressure increased. The tetragonal phase fraction in the thin films decreased gradually as Oxygen Partial Pressure increased. The residual stress of film deposited at base Pressure was high compressive stress, the value decreased with the increase of Oxygen Partial Pressure, and the residual stress became tensile with the further increase of Oxygen Pressure, which was corresponding to the evolution of packing densities and variation of interplanar distances.
-
Effects of Oxygen Partial Pressure on optical absorption edge and UV emission energy of ZnO films
Chinese Optics Letters, 2005Co-Authors: Ruijin Hong, Jianda Shao, Zhengxiu FanAbstract:The optical absorption edge and ultraviolet (UV) emission energy of ZnO films deposited by direct current (DC) reactive magnetron sputtering at room temperature have been investigated. With the Oxygen ratio increasing, the structure of films changes from zinc and zinc oxide coexisting phase to single-phase ZnO and finally to the highly (002) orientation. Both the grain size and the stress of ZnO film vary with the Oxygen Partial Pressure. Upon increasing the Oxygen Partial Pressure in the growing ambient, the visible emission in the room-temperature photoluminescence spectra was suppressed without sacrificing the band-edge emission intensity in the ultraviolet region. The peaks of photoluminescence spectra were located at 3.06---3.15 eV. From optical transmittance spectra of ZnO films, the optical band gap edge was observed to shift towards shorter wavelength with the increase of Oxygen Partial Pressure.
Ronan O’driscoll - One of the best experts on this subject based on the ideXlab platform.
-
Relating Oxygen Partial Pressure, saturation and content: the haemoglobin–Oxygen dissociation curve
European Respiratory Society, 2015Co-Authors: Julie-ann Collins, Aram Rudenski, John Gibson, Luke Howard, Ronan O’driscollAbstract:Key Points In clinical practice, the level of arterial Oxygenation can be measured either directly by blood gas sampling to measure Partial Pressure (PaO2) and percentage saturation (SaO2) or indirectly by pulse oximetry (SpO2).; This review addresses the strengths and weaknesses of each of these tests and gives advice on their clinical use.; The haemoglobin–Oxygen dissociation curve describing the relationship between Oxygen Partial Pressure and saturation can be modelled mathematically and routinely obtained clinical data support the accuracy of a historical equation used to describe this relationship.; Educational Aims To understand how Oxygen is delivered to the tissues.; To understand the relationships between Oxygen saturation, Partial Pressure, content and tissue delivery.; The clinical relevance of the haemoglobin–Oxygen dissociation curve will be reviewed and we will show how a mathematical model of the curve, derived in the 1960s from limited laboratory data, accurately describes the relationship between Oxygen saturation and Partial Pressure in a large number of routinely obtained clinical samples.; To understand the role of pulse oximetry in clinical practice.; To understand the differences between arterial, capillary and venous blood gas samples and the role of their measurement in clinical practice.; The delivery of Oxygen by arterial blood to the tissues of the body has a number of critical determinants including blood Oxygen concentration (content), saturation (SO2) and Partial Pressure, haemoglobin concentration and cardiac output, including its distribution. The haemoglobin–Oxygen dissociation curve, a graphical representation of the relationship between Oxygen saturation and Oxygen Partial Pressure helps us to understand some of the principles underpinning this process. Historically this curve was derived from very limited data based on blood samples from small numbers of healthy subjects which were manipulated in vitro and ultimately determined by equations such as those described by Severinghaus in 1979. In a study of 3524 clinical specimens, we found that this equation estimated the SO2 in blood from patients with normal pH and SO2 >70% with remarkable accuracy and, to our knowledge, this is the first large-scale validation of this equation using clinical samples. Oxygen saturation by pulse oximetry (SpO2) is nowadays the standard clinical method for assessing arterial Oxygen saturation, providing a convenient, pain-free means of continuously assessing Oxygenation, provided the interpreting clinician is aware of important limitations. The use of pulse oximetry reduces the need for arterial blood gas analysis (SaO2) as many patients who are not at risk of hypercapnic respiratory failure or metabolic acidosis and have acceptable SpO2 do not necessarily require blood gas analysis. While arterial sampling remains the gold-standard method of assessing ventilation and Oxygenation, in those patients in whom blood gas analysis is indicated, arterialised capillary samples also have a valuable role in patient care. The clinical role of venous blood gases however remains less well defined
