scholarly journals EGYPT, DASHUR: AN ANCIENT CO/CO2 GAS GENERATOR DISCOVERED ON THE LOWER LEVEL OF THE BENT PYRAMID OF SNEFERU

2017 ◽  
pp. 104-110
Author(s):  
A. M. Yaroschuk
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Gas Generator ◽  
Co2 Gas ◽  
Lower Tier ◽  
Carbon Dioxide Gas

The article researches the design and the purpose of the lower tier chamber in the Bent Pyramid of Sneferu in Dashure. The review of the earlier archeological research materials has shown that the purpose of the chamber has not been determined. In the process of the current research a technological link between the lower and the upper tiers of the pyramid has been found. It has been proven that the lower tier elements (the chamber itself, the shaft, and the chimney) all together comprised an ancient furnace – a CO/CO2 gas generator. Its purpose was to produce a mixture of carbon monoxide and carbon dioxide gas to fill the space of the upper tier of the pyramid. The goal of the architect or was to make the pyramid chambers deadly for burglars.  Constructive  similarities  between  the  furnace  in  the  lower  tier of the Sneferu Pyramid and the modern CO/CO2 gas generator have been established. A theory about the presence of the secret chambers in the pyramid, including the  chamber  containing  the  Sarcophagus  of  the  Pharaoh  has  been  substantiated. A theory  explaining  the  purpose  of  changing  the  shape  and  the  construction of the Bent Pyramid specifically has been proposed. 

Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film

2011 ◽  
Vol 135-136 ◽  
pp. 347-352 ◽  
Author(s):  
Chang Bao Wen ◽  
Yong Feng Ju ◽  
Wan Lin Li ◽  
Wen Zheng Sun ◽  
Xin Xu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Sensor ◽  
Side Lobe ◽  
Center Frequency ◽  
Zno Film ◽  
Co2 Gas ◽  
Response Characteristics ◽  
Carbon Dioxide Gas ◽  
Co2 Gas Sensor ◽  
Carbon Dioxide Co2

Carbon dioxide (CO2) gas sensor using surface acoustic wave (SAW) device based on Zinc oxide (ZnO) was developed and fabricated in this paper. The center frequency of SAW device is 203.528 MHz. The input and two output interdigital transducers (IDT) apodized by Morlet wavelet function can improve the side lobe rejection compared with uniform IDT. The ZnO film sensitive to CO2 gas was fabricated in measurement acoustic track of SAW device. Experiments results confirm that the CO2 gas sensor using SAW device based on ZnO film has good response characteristics to different concentrations CO2 gas. Furthermore, the CO2 gas sensor using SAW device based on ZnO film has good stability and linearity.

Metallurgical failure analysis of an exploded CO2 gas cylinder

2020 ◽  
Vol 62 (11) ◽  
pp. 1085-1088
Author(s):  
Syed Fida Hassan
Keyword(s):  
Carbon Dioxide ◽  
Building Construction ◽  
Construction Site ◽  
Co2 Gas ◽  
Microstructure Observation ◽  
Carbon Dioxide Gas ◽  
Filling Station ◽  
Gas Cylinder ◽  
Martensitic Microstructure ◽  
External Corrosion

Abstract A gas cylinder, containing carbon dioxide (CO2) in a manifold of sixteen cylinders, exploded in an outdoor building construction site at midday within two hours of its arrival from a filling station. It was to be used for construction welding. The seamless gas cylinder that exploded was made of low alloy steel with a tempered martensitic microstructure. Observation revealed the presence of discreet localized external corrosion which weakened the gas cylinder extremely. A study concluded that the midday outdoor heat had apparently increased the pressure of the carbon dioxide gas within which in turn led to the sudden catastrophic explosion of the weakened corroded gas cylinder.

Selective trapping of CO2 gas and cage occupancy in CO2–N2 and CO2–CO mixed gas hydrates

2018 ◽  
Vol 54 (34) ◽  
pp. 4290-4293 ◽  
Author(s):  
Claire Petuya ◽  
Françoise Damay ◽  
Sarah Desplanche ◽  
David Talaga ◽  
Arnaud Desmedt
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Gas Hydrates ◽  
Hydrate Formation ◽  
Gas Mixtures ◽  
Clathrate Hydrate ◽  
Mixed Gas ◽  
Co2 Gas ◽  
Carbon Dioxide Separation

New carbon dioxide separation and capture technology, thanks to clathrate hydrate formation from pressurized ice with (carbon monoxide and nitrogen containing) gas mixtures.

scholarly journals QUALITY ASSESSMENT OF EGGS PACKED UNDER MODIFIED ATMOSPHERE

2015 ◽  
Vol 39 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Aline Giampietro-Ganeco ◽  
Hirasilva Borba ◽  
Aline Mary Scatolini-Silva ◽  
Marcel Manente Boiago ◽  
Pedro Alves de Souza ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Egg Quality ◽  
Modified Atmosphere Packaging ◽  
Vacuum Packaging ◽  
Modified Atmosphere ◽  
Gas Generator ◽  
Co2 Gas ◽  
Oxygen Gas ◽  
Carbon Dioxide Co2 ◽  
Haugh Unit

Eggs are perishable foods and lose quality quickly if not stored properly. From the moment of posture to the marketing of egg, quality loss occurs through gas exchange and water through the pores of the shell with the external environment and thus, studies involving modified atmosphere packaging are extremely important. The aim of the present study is to assess the internal quality of eggs packed under modified atmosphere and stored at room temperature. Six hundred and twelve fresh commercial eggs from 38-week old Hisex White laying hens were used. The present study was conducted in a completely randomized experimental design in a 4 x 4 + 1 factorial arrangement [vacuum, vacuum with oxygen gas (O2) absorbent, vacuum with oxygen gas (O2) and carbon dioxide (CO2) absorbents, vacuum with oxygen gas (O2) absorbent and carbon dioxide (CO2) gas generator; storage times (7, 14, 21 and 28 days), control group (fresh eggs)], with three repetitions (12 eggs each). The following factors were assessed: weight maintenance during storage; Haugh unit; color and yolk index. The modified atmosphere packaging maintained the weight of the eggs during a period of 28 days. Vacuum packaging with O2 absorbent and CO2 gas generator was more efficient in maintenance of egg quality, based on the values of Haugh unit and yolk index. The luminosity of the yolk was preserved during the 28 storage days in all of the packaging types used. The vacuum packaging with O2 gas absorbent and CO2 gas generator provide an increase in internal egg quality.

scholarly journals Production of formate from CO2 gas under ambient conditions: towards flow-through enzyme reactors

2020 ◽  
Vol 22 (12) ◽  
pp. 3727-3733 ◽  
Author(s):  
Mohamed Baccour ◽  
Alexandra Lamotte ◽  
Kento Sakai ◽  
Eric Dubreucq ◽  
Ahmad Mehdi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ambient Conditions ◽  
Co2 Gas ◽  
Enzyme Reactors ◽  
Carbon Dioxide Gas ◽  
Flow Through ◽  
Enzymatic Reactor

A flow-through bi-enzymatic reactor was developed to produce formate from carbon dioxide gas (CO2).

scholarly journals Modeling and Investigating the Production of Carbon Dioxide Gas Using HSC Software in the Tile Industry

2021 ◽  
Author(s):  
Shima Nakhjavani ◽  
Hamideh Bidel ◽  
Maryam Nakhjavani ◽  
Hamideh Zavvar ◽  
Sayed Mojtaba Momtaz ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Carbon Dioxide Production ◽  
Effect Of Temperature ◽  
Reaction Conditions ◽  
Carbon Dioxide Gas ◽  
Different Temperatures ◽  
Concentration Changes ◽  
Hsc Chemistry ◽  
Emission Of Greenhouse Gases

Background: The study of the production and emission of greenhouse gases, including CO2 in the atmosphere, is one of the most important environmental issues and concerns of the international community. This study was conducted to investigate the effect of temperature and furnace fuel concentration changes on CO2 and CO production. Methods: In this study, using HSC Chemistry 6 software, the existing reactions for fuels used in the furnace, including CaCO3, MgCO3, Fe2O3, and Fe3O4, were simulated. The concentrations of carbon dioxide and carbon monoxide produced at different temperatures were investigated. Results: In the CaCO3 reaction, the temperature has a direct effect on carbon dioxide production but no effect on carbon monoxide production. In the MgCO3 reaction, the temperature has little effect on the production of both, and for the rest of the reactions, the effect of temperature depends on the molar composition and reaction conditions. Conclusion: In general, the results show that temperature affects the production of carbon dioxide and monoxide, so the emission of these gases to the environment can be reduced by adjusting the temperature of the furnace reactors.

Gain obtained by injecting carbon dioxide gas into a supersonic stream containing carbon monoxide

1978 ◽  
Vol 8 (5) ◽  
pp. 669-670 ◽  
Author(s):  
A S D'yakov ◽  
A I Didyukov ◽  
B K Tkachenko ◽  
E M Cherkasov
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Supersonic Stream ◽  
Carbon Dioxide Gas
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