The determination of oxygen in powdered tungsten carbide by reducing fusion: Suppression of primary carbon dioxide, selection of working conditions and adsorbed-moisture effects

Talanta ◽  
1980 ◽  
Vol 27 (11) ◽  
pp. 881-885 ◽  
Author(s):  
A COLOMBO
Keyword(s):  
Carbon Dioxide ◽  
Tungsten Carbide ◽  
Working Conditions ◽  
Moisture Effects ◽  
Selection Of ◽  
Adsorbed Moisture

scholarly journals Review of technological methods and experimental determination of thermodynamic and transport properties of reagents for carbon dioxide removal from flue gases

2014 ◽  
Vol 68 (1) ◽  
pp. 123-134
Author(s):  
Vuk Spasojevic ◽  
Slobodan Serbanovic ◽  
Predrag Stefanovic ◽  
Mirjana Kijevcanin
Keyword(s):  
Carbon Dioxide ◽  
Combustion Process ◽  
Carbon Dioxide Removal ◽  
Flue Gases ◽  
Process Equipment ◽  
Key Points ◽  
Working Parameters ◽  
Technological Methods ◽  
Selection Of

In this work a review of the currently available methods for carbon dioxide removal from flue gasses is given. Some of them are commercially available, while others are still under development. Special attention is given to detailed description of the methods based on hemi sorption by aqueous solutions of alkanol amines, which found wide commercial use in industry. Selection of appropriate absorbent, process equipment, methods, working parameters, combustion process etc. are some of key points that will be reviewed within this work in order to present advantages and limitations of carbon dioxide removal methods. In the experimental section density, viscosity and refractive index of insufficiently investigated carbon dioxide removal agents, such as monoisopropanolamine (MIPA), diisopropanolamine (DIPA), triisopropanolamine (TIPA) and currently widely used dietanolamine (DEA) are provided. The data obtained are crucial for the equipment design and process optimization.

scholarly journals Synthesis of Nano-Praseodymium Oxide for Cataluminescence Sensing of Acetophenone in Exhaled Breath

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4275 ◽  
Author(s):  
Qian-Chun Zhang ◽  
Wu-Li Yan ◽  
Li Jiang ◽  
Yu-Guo Zheng ◽  
Jing-Xin Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Working Conditions ◽  
Linear Response ◽  
Limit Of Detection ◽  
Exhaled Breath ◽  
Praseodymium Oxide ◽  
Weak Response ◽  
Promising Application ◽  
Optimized Conditions

In this work, we successfully developed a novel and sensitive gas sensor for the determination of trace acetophenone based on its cataluminescence (CTL) emission on the surface of nano-praseodymium oxide (nano-Pr6O11). The effects of working conditions such as temperature, flow rate, and detecting wavelength on the CTL sensing were investigated in detail. Under the optimized conditions, the sensor exhibited linear response to the acetophenone in the range of 15–280 mg/m3 (2.8–52 ppm), with a correlation coefficient (R2) of 0.9968 and a limit of detection (S/N = 3) of 4 mg/m3 (0.7 ppm). The selectivity of the sensor was also investigated, no or weak response to other compounds, such as alcohols (methanol, ethanol, n-propanol, iso-propanol, n-butanol), aldehyde (formaldehyde and acetaldehyde), benzenes (toluene, o-xylene, m-xylene, p-xylene), n-pentane, ethyl acetate, ammonia, carbon monoxide, carbon dioxide. Finally, the present sensor was applied to the determination of acetophenone in human exhaled breath samples. The results showed that the sensor has promising application in clinical breath analysis.

An Infrared Method for the Determination of Carbon Monoxide and Carbon Dioxide Levels in Cigarette Smoke

1972 ◽  
Vol 6 (5) ◽  
Author(s):  
T.B. Williams ◽  
C.W. Belk
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Single Port ◽  
Wave Length ◽  
Critical Flow ◽  
Infra Red ◽  
Infrared Method ◽  
Carbon Dioxide Levels ◽  
Selection Of

AbstractA method for the simultaneous determination of the CO and CO2 concentrations in each puff of a cigarette was developed. Puff characteristics of single and multiport smoking machines were controlled by selection of critical flow orifices. The CO and CO2 were rapidly measured by nondispersive infra-red analysers, which required no wave length scanning and were free from interference by other smoke components. Precision was increased by a six-port head compared to a single port but was not improved by a 12-port head. The procedure has been applied in studies of various commercial and experimental cigarettes

scholarly journals Tribological Behavior of Hydraulic Cylinder Coaxial Sealing Systems Made from PTFE and PTFE Compounds

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 155
Author(s):  
Andrea Deaconescu ◽  
Tudor Deaconescu
Keyword(s):  
Film Thickness ◽  
Working Conditions ◽  
Tribological Behavior ◽  
Hydraulic Cylinder ◽  
Current Trends ◽  
Cylinder Piston ◽  
Hydraulic Cylinders ◽  
Fluid Film Thickness ◽  
Selection Of

Current trends concerning hydraulic cylinder sealing systems are aimed at decreasing energy consumption which can be materialized by minimizing leaks and reducing friction. The latest developments in the field of materials and sealing system geometries as well as modern simulation possibilities allow maximum performance levels of hydraulic cylinders. Reducing friction is possible by hydro-dynamic separation of the sliding and sealing points already at very low velocities and by using materials, such as plastomers, from polytetrafluoroethylene (PTFE) (virgin PTFE and filled PTFE). It is within this context that this paper discusses a theoretical and experimental study focused on the tribological behavior of coaxial sealing systems mounted on the pistons of hydraulic cylinders. It presents a methodology for the theoretical determination of the lubricant film thickness between the cylinder piston and the seal. The experimental installation used for measuring fluid film thickness is presented, and the results obtained under various working conditions are compared to the theoretical ones. For the analyzed working conditions related to pressure, speed, and temperature, the paper concludes with a set of criteria for the selection of the optimum seal material so as to maximize energy efficiency.

DETERMINING THE DESALINATION UNIT COMPOSITION FOR COSTAL AREAS AND SMALL ISLANDS USE ANALYTIC HIERARCHY PROCESS

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Imam Setiadi ◽  
Dinda Rita K. Hartaja
Keyword(s):  
Analytic Hierarchy Process ◽  
Energy Demand ◽  
Pairwise Comparison ◽  
Small Islands ◽  
Ahp Method ◽  
Analytic Hierarchy ◽  
Comparison Research ◽  
Hierarchy Process ◽  
Selection Of

Selection of the appropriate composition desalination units can be done with a variety of method approaches, one of the method is the Analytic Hierarchy Process. In determining the desalination unit with AHP method to consider is setting a goal, an alternative criteria and pairwise comparison. Research for the determination of the exact composition of the desalination unit in order to achieve sustainable drinking water suppy in coastal areas and small islands has been conducted. The results of the study are as follows, the energy demand of 50.83%, operator costs of 26.64%, maintenance costs of 14.13% and chemical requirement 8.4%. For an alternative composition desalination unit of RO 10 m3 / day is the best alternative composition with value of 59.61%, the composition of the next alternative is RO 20 m3/ day of 30.40% and the last alternative of the desalination unit composition is RO 120 m3/ day of 09.99%.Key words : Desalination, Mukti Stage Flash Composition, AHP

Optimization of the selection of analysis methods for the determination of naturally occurring radionuclides

Kerntechnik ◽  
2008 ◽  
Vol 73 (3) ◽  
pp. 118-121
Author(s):  
T. Heinrich ◽  
L. Funke ◽  
M. Köhler ◽  
U.-K. Schkade ◽  
F. Ullrich ◽  
...  
Keyword(s):  
Naturally Occurring ◽  
Analysis Methods ◽  
Naturally Occurring Radionuclides ◽  
Selection Of
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