Determination of the Charge on Dust Particles Due to Deposition on, and Separation from, Solid Surfaces

1966 ◽  
pp. 296-302 ◽  
Author(s):  
A. D. Zimon ◽  
N. I. Dovnar ◽  
G. A. Belkina ◽  
G. V. Nozdrina
Keyword(s):  
Solid Surfaces ◽  
Dust Particles

scholarly journals Evaluation of Marblewood Dust’s (Marmaroxylon racemosum) Effect on Ignition Risk

2021 ◽  
Vol 11 (15) ◽  
pp. 6874
Author(s):  
Miroslava Vandličkova ◽  
Iveta Markova ◽  
Katarina Holla ◽  
Stanislava Gašpercová
Keyword(s):  
Particle Size ◽  
Dust Particles ◽  
Wood Dust ◽  
Sieve Analysis ◽  
Granulometric Analysis ◽  
Analysis Measurement ◽  
Risk Research ◽  
Minimum Ignition Temperature ◽  
The Impact

The paper deals with the selected characteristics, such as moisture, average bulk density, and fraction size, of tropical marblewood dust (Marmaroxylon racemosum) that influence its ignition risk. Research was focused on sieve analysis, granulometric analysis, measurement of moisture level in the dust, and determination of the minimum ignition temperatures of airborne tropical dust and dust layers. Samples were prepared using a Makita 9556CR 1400W grinder and K36 sandpaper for the purpose of selecting the percentages of the various fractions (<63, 63, 71, 100, 200, 315, 500 μm). The samples were sized on an automatic vibratory sieve machine Retsch AS 200. More than 65% of the particles were determined to be under 100 μm. The focus was on microfractions of tropical wood dust (particles with a diameter of ≤100 µm) and on the impact assessment of particle size (particle size <100 µm) on the minimum ignition temperatures of airborne tropical dust and dust layers. The minimum ignition temperature of airborne marblewood dust decreased with the particle size to the level of 400 °C (particle size 63 μm).

Determination of conjugation rates on solid surfaces

Plasmid ◽  
2012 ◽  
Vol 67 (2) ◽  
pp. 174-182 ◽  
Author(s):  
Irene del Campo ◽  
Raúl Ruiz ◽  
Ana Cuevas ◽  
Carlos Revilla ◽  
Luis Vielva ◽  
...  
Keyword(s):  
Solid Surfaces

scholarly journals Influence of nitrogen dioxide and acetylene on marbles, ceramics and pigment

2013 ◽  
Vol 10 (2) ◽  
pp. 183-191
Keyword(s):  
Air Pollution ◽  
Nitrogen Dioxide ◽  
Synergistic Effects ◽  
Scientific Basis ◽  
Solid Surfaces ◽  
Reversed Flow ◽  
The Social ◽  
Tio2 Pigment ◽  
Adsorption Quantity

The air pollution has a great impact on the social and economic aspects all over the world. Thus, the interaction of materials with the atmosphere has received increased attention nowadays. In order to estimate the impacts of air pollution on the solid surfaces a suitable scientific basis is developed and the well known Reversed Flow - Inverse Gas Chromatography, RF- IGC, is used. This dynamic experimental technique leads to very interesting experimental results through the determination of some important physicochemical quantities. The solids studied were Pentelic marble, white TiO2 pigment, ceramic and the gases were NO2 and C2H2. The synergistic effects between acetylene and nitrogen dioxide were also investigated. Through the curves obtained for each adsorption quantity determined versus time, one can easily and accurately conclude the result of the pollution impact on every solid mentioned above. The surface topography and the mechanism of deterioration can also be studied. All the above answer in detail to the questions of where, when and how the influence of gas pollutants on materials of cultural heritage takes place.

A discussion on orbital analysis - Longitude dependence of the geopotential, deduced from synchronous satellites

1967 ◽  
Vol 262 (1124) ◽  
pp. 137-143 ◽  
Keyword(s):  
Effective Potential ◽  
Dust Particles ◽  
Stable Plane ◽  
The Poor ◽  
Stable Points ◽  
Orbital Analysis

Observations of Syncom 2 and Syncom 3 during seven separate periods of free drift have been used in an attempt to find the effective potential at synchronous height. Although the accelerations are well determined near the two longitudes, 180° E and 300° E, where the observations are clustered, the poor distribution in longitude does not permit a satisfactory determination of individual coefficients. It would be particularly valuable to have observations in the region 0 to 40° E or around either of the two stable points near 70° E and 250° E. If there is or has been any significant population of dust particles in distant geocentric orbits, it is likely that a proportion will have been captured in the synchronous resonance, and will have accumulated near the stable positions. It is therefore suggested that it would be worth attempting to observe whether there are clouds of dust particles near the stable longitudes, and in the stable plane for synchronous height.

ASSESSMENT OF THE TECHNICALLY ACHIEVABLE LEVEL OF DUSTINESS IN THE AIR DURING EXCAVATION WORK IN COAL MINES

2021 ◽  
pp. 37-43
Author(s):  
Sergey Mineev ◽  
◽  
Oleg Usov ◽  
Keyword(s):  
Trade Unions ◽  
Maximum Level ◽  
Dust Control ◽  
Entire Period ◽  
Dust Particles ◽  
Excavation Work ◽  
Mathematical Formalization ◽  
Coal Enterprises ◽  
Dust Load

Purpose. Development of a criterion for compliance with the normative indicator – technically achievable level of dust (TAL) – a safe dose of dust particles that have entered the lungs of the employee for the entire period of retirement. Method. The research was conducted on the basis of standard algebraic analysis of the requirements of regulatory documents. Results. A criterion was obtained for the assessment by the coordinating organizations of the correctness of the mine’s determination of the technically achievable level of dustiness of the TAL. It is not related to the assessment of the perfection of dust control technology, but to the medical requirements for the prevention of employee pneumoconiosis during the entire retirement age of his work in a dusty atmosphere (20 years). The criterion is based on the amount of dust load on the respiratory organs of the underground worker during the shift, month, year and the entire period of his work, regulated by current regulations. Scientific novelty. It consists in the mathematical formalization of an intuitive connection between TAL – the maximum level of dustiness of underground workings during excavation machines, medium-variable dust, which takes into account interruptions in the work of excavation machines, and dust load on the respiratory organs of the worker. Practical meaning. The developed criterion allows to carry out the coordinated policy of the management and trade unions of the coal enterprises, supervisory and coordinating instances in questions of reasonable sufficiency of the planned antidust measures, both at a stage of drawing up of the design documentation, and at coordination of acts of TAL. Key words: dustiness, dust load, respiratory organs, dust excretion, dust suppression.

scholarly journals The study of the aerodynamic characteristics of dust particles in the air of roadside areas

2019 ◽  
Vol 126 ◽  
pp. 00071
Author(s):  
Anatoly Vasiliev ◽  
Igor Stefanenko ◽  
Valery Azarov ◽  
Denis Nikolenko
Keyword(s):  
Aerodynamic Characteristics ◽  
Dust Particles

The article addresses issues, which are related to the determination of aerodynamic characteristics of dust particles in roadside air areas. Was studied dustiness of Volgograd roadside areas.

scholarly journals Precise determination of water exchanges on a mineral surface

2016 ◽  
Vol 18 (41) ◽  
pp. 28819-28828 ◽  
Author(s):  
Andrew G. Stack ◽  
Jose M. Borreguero ◽  
Timothy R. Prisk ◽  
Eugene Mamontov ◽  
Hsiu-Wen Wang ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Fundamental Property ◽  
Precise Determination ◽  
Solid Surfaces ◽  
Mineral Surface ◽  
Dissolved Ions

Solvent exchanges on solid surfaces and dissolved ions are a fundamental property important for understanding chemical reactions, but the rates of fast exchanges are poorly constrained.

Sign in / Sign up

Export Citation Format

Share Document