The Effect of Oxygen-Coal Equivalent Ratio on the Rapid Preparation of Powdered Activated Coke in Low Oxygen Atmosphere

2021 ◽  
pp. 701-715
Author(s):  
Binxuan Zhou ◽  
Yuan Zhao ◽  
Cheng Li ◽  
Tao Wang ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Oxygen Atmosphere ◽  
Low Oxygen ◽  
Rapid Preparation ◽  
Equivalent Ratio ◽  
Activated Coke ◽  
Effect Of Oxygen

THE UNIQUE FETAL RED CELL AND ITS FUNCTION

PEDIATRICS ◽  
1973 ◽  
Vol 51 (3) ◽  
pp. 494-500 ◽  
Author(s):  
Frank A. Oski
Keyword(s):  
Red Blood Cells ◽  
Newborn Infant ◽  
Blood Cells ◽  
Human Fetus ◽  
Exchange Transfusion ◽  
Oxygen Atmosphere ◽  
Hypoxic Stress ◽  
Red Cell ◽  
Low Oxygen ◽  
Rapid Replacement

The red blood cells of the human fetus differ in many major respects from the red cells of the normal adult. These differences appear admirably suited for the acquisition, transport, and release of oxygen in the low oxygen atmosphere of intrauterine existence. These same differences appear to confer a handicap to the cell in the extrauterine environment, particularly under conditions of hypoxic stress. The rapid replacement of these cells by artificial means, such as early exchange transfusion, may offer an advantage to the newborn infant in certain clinical situations.

scholarly journals Effects of Low-oxygen Atmosphere on Ethanolic Fermentation in Fresh-cut Carrots

1997 ◽  
Vol 122 (1) ◽  
pp. 107-111 ◽  
Author(s):  
Hisashi Kato-Noguchi ◽  
Alley E. Watada
Keyword(s):  
Alcohol Dehydrogenase ◽  
Daucus Carota ◽  
Continuous Flow ◽  
Pyruvate Decarboxylase ◽  
Oxygen Atmosphere ◽  
Low Oxygen ◽  
Ethanolic Fermentation ◽  
Fresh Cut ◽  
Fermentation Metabolism

Carrot (Daucus carota L.) root shreds were stored under a continuous flow of 0.5% and 2% O2 (balance N2) or in air for 7 days at 5 and 15 °C to study the regulation of ethanolic fermentation metabolism. Low-O2 atmospheres of 0.5% and 2% caused increases in ethanol and acetaldehyde concentrations and the activities of alcohol dehydrogenase (ADH) and pyruvate decarboxylase (PDC) compared to air. By day 3, ethanol increased 38-, 25-, 13-, and 9.5-fold; acetaldehyde increased 20-, 13-, 7.7-, and 5.6-fold; ADH increased 7.6-, 6.3-, 3.8-, and 2.7-fold; and PDC increased 4.2-, 3.9-, 2.3-, and 2.2-fold in samples at 0.5% O2 at 15 or 5 °C and at 2% O2 at 15 or 5 °C, respectively, compared with corresponding samples in air. These results indicate that ethanolic fermentation was accelerated more in the 0.5% than in the 2% O2 atmosphere and more at 15 °C than at 5 °C. The acceleration of ethanolic fermentation may allow production of some ATP, which may permit the carrot tissues to survive.

Effect of Oxygen and Water in the CO Photocatalytic Oxidation with TiO2

2011 ◽  
Vol 324 ◽  
pp. 149-152
Author(s):  
Carlos Youssef ◽  
Eric Puzenat ◽  
Samir Najm ◽  
Nicole Jaffrezic-Renault ◽  
Chantal Guillard
Keyword(s):  
Water Vapor ◽  
Active Sites ◽  
Photocatalytic Oxidation ◽  
Low Oxygen ◽  
High Concentration ◽  
Co Concentration ◽  
Langmuir Hinshelwood Mechanism ◽  
Effect Of Oxygen ◽  
Two Parameters ◽  
Low Oxygen Concentration

TiO2P25 catalyst was used to study the photocatalytic oxidation of CO to CO2at 288K. Two parameters, O2and H2O were used to study its effect on the photocatalytic process. The dependency of the reaction rate on the CO concentration and water vapor was explained in terms of Langmuir-Hinshelwood mechanism. The presence of a high concentration of water vapor inhibits the CO photocatalytic oxidation at low oxygen concentration. We have noted an adsorption competition between CO and H2O on the TiO2active sites.

Effect of oxygen on the formation of end-of-range disorder in implantation amorphized silicon

1991 ◽  
Vol 6 (8) ◽  
pp. 1695-1700 ◽  
Author(s):  
E. Lorenz ◽  
J. Gyulai ◽  
L. Frey ◽  
H. Ryssel ◽  
N.Q. Khanh
Keyword(s):  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Defect Structure ◽  
Defect Density ◽  
Low Oxygen ◽  
Continuous Layer ◽  
Float Zone ◽  
Order Of Magnitude ◽  
Visible Effect ◽  
Effect Of Oxygen

Formation of End-of-Range (EOR) disorder was studied in (100)-oriented silicon, when subjected to amorphization by implantation of Ge+ ions, followed by a 10 s Rapid Thermal Annealing (RTA) at 1050 °C. XTEM, RBS/channeling, and SIMS were used to analyze Czochralski grown (CZ) silicon wafers with oxygen concentrations of 6.5, 7.0, and 8.0 × 1017/cm3 and Float Zone (FZ) silicon, as “low oxygen” wafers. Amorphization on neighboring parts of the 4″ wafers was made either by 60 keV Ge+ implantation or by 110 keV Ge+ implantation and by sequential (60 keV + 110 keV) Ge+ implantation. Parts of each wafer were additionally implanted with 13 keV boron. In FZ silicon, no defects were found for 60 keV Ge+ implantation and RTA at 1050 °C. For 110 keV Ge+ and sequential (60 keV + 110 keV) Ge+ implantation in FZ-silicon the majority of the samples showed perfect annealing. Two wafers, however, subjected to sequential implantation still contained defects but with a defect density that was one order of magnitude lower than for CZ wafers. For one of them, not even a continuous layer of defects was formed. In contrast, CZ wafers contained defect bands, except for the 60 keV Ge+ implantation [in accord with the findings of Ozturk et al., IEEE Trans. on Electronic Dev. 35, 659 (1988)]. The presence of boron had no visible effect on the defect structure.

Effect of Oxygen on Growth of Mycobacterium ulcerans in the BACTEC System

1998 ◽  
Vol 36 (11) ◽  
pp. 3420-3422 ◽  
Author(s):  
J. C. Palomino ◽  
A. M. Obiang ◽  
L. Realini ◽  
W. M. Meyers ◽  
F. Portaels
Keyword(s):  
Primary Culture ◽  
Oxygen Concentration ◽  
Oxygen Tension ◽  
Mycobacterium Ulcerans ◽  
Clinical Samples ◽  
Low Oxygen ◽  
Bactec System ◽  
Effect Of Oxygen ◽  
Low Oxygen Concentration

The effect of low oxygen concentration on the growth of 15 strains of Mycobacterium ulcerans was evaluated in the BACTEC system. Reduced oxygen tension enhanced the growth of M. ulcerans, suggesting that this organism has a preference for microaerobic environments. Application of this observation may improve rates of isolation of M. ulcerans in primary culture from clinical samples and promote isolation of the bacterium from environmental sources.

Effect of Oxygen Atmosphere on Infrared Properties of Non-Hydrogenated Diamond-Like Carbon Films

2020 ◽  
Vol 47 (4) ◽  
pp. 0403005
Author(s):  
陆益敏 Lu Yimin ◽  
黄国俊 Huang Guojun ◽  
王赛 Wang Sai ◽  
米朝伟 Mi Chaowei ◽  
蔡晓红 Cai Xiaohong ◽  
...  
Keyword(s):  
Carbon Films ◽  
Oxygen Atmosphere ◽  
Diamond Like Carbon ◽  
Effect Of Oxygen

scholarly journals The effects of oxygen depletion due to upwelling groundwater on the posthatch fitness of Atlantic salmon (Salmo salar)

2016 ◽  
Vol 73 (12) ◽  
pp. 1830-1840 ◽  
Author(s):  
Jack Bloomer ◽  
David Sear ◽  
Peter Dutey-Magni ◽  
Paul Kemp
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Oxygen Depletion ◽  
Hyporheic Exchange ◽  
Fine Scale ◽  
Review Of The Literature ◽  
Low Oxygen ◽  
Atlantic Salmon Salmo Salar ◽  
Effect Of Oxygen ◽  
Scale Control

The conditions experienced by incubating Atlantic salmon (Salmo salar) eggs are strongly influenced by hyporheic exchange. In some rivers, periods of intense groundwater upwelling can reduce oxygen levels in the incubation zone to 0% saturation. The present study investigated the effect of oxygen sags on the posthatch fitness of Atlantic salmon. A laboratory experiment allowed fine-scale control of oxygen concentrations to replicate those induced by low oxygen groundwater in rivers. Extreme oxygen sags in the earlier stages of embryo development resulted in a developmental lag with alevin hatching later and at an underdeveloped state. At the latest stages of development, oxygen sags caused premature hatching of severely underdeveloped alevin. These findings combined with a review of the literature suggest posthatch survival of embryos exposed to groundwater-induced hypoxia will be lower because of predation and poor competitiveness.

scholarly journals Large Mass-Independent Oxygen Isotope Fractionations in Mid-Proterozoic Sediments: Evidence for a Low-Oxygen Atmosphere?

Astrobiology ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 628-636 ◽  
Author(s):  
Noah J. Planavsky ◽  
Christopher T. Reinhard ◽  
Terry T. Isson ◽  
Kazumi Ozaki ◽  
Peter W. Crockford
Keyword(s):  
Oxygen Isotope ◽  
Large Mass ◽  
Oxygen Atmosphere ◽  
Low Oxygen

scholarly journals Process-Parameter-Dependent Structural, Electrical, and Optical Properties of Reactive Magnetron Sputtered Ag-Cu-O Films

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
P. Narayana Reddy ◽  
A. Sreedhar ◽  
M. Hari Prasad Reddy ◽  
S. Uthanna ◽  
J. F. Pierson
Keyword(s):  
Optical Properties ◽  
Substrate Temperature ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Rf Magnetron Sputtering ◽  
Low Oxygen ◽  
Electrical And Optical Properties ◽  
Partial Pressures ◽  
Effect Of Oxygen ◽  
Parameter Dependent

Silver-copper-oxide thin films were formed by RF magnetron sputtering technique using Ag80Cu20target at various oxygen partial pressures in the range 5 × 10−3–8 ×10−2 Pa and substrate temperatures in the range 303–523 K. The effect of oxygen partial pressure and substrate temperature on the structure and surface morphology and electrical and optical properties of the films were studied. The Ag-Cu-O films formed at room temperature (303 K) and at low oxygen partial pressure of 5 × 10−3 Pa were mixed phase of Ag2Cu2O3and Ag, while those deposited at 2 × 10−2 Pa were composed of Ag2Cu2O4and Ag2Cu2O3phases. The crystallinity of the films formed at oxygen partial pressure of 2 × 10−2Pa increased with the increase of substrate temperature from 303 to 423 K. Further increase of substrate temperature to 523 K, the films were decomposed in to Ag2O and Ag phases. The electrical resistivity of the films decreased from 0.8 Ωcm with the increase of substrate temperature from 303 to 473 K due to improvement in the crystallinity of the phase. The optical band gap of the Ag-Cu-O films increased from 1.47 to 1.83 eV with the increase of substrate temperature from 303 to 473 K.

Sign in / Sign up

Export Citation Format

Share Document