FORECASTING GAS EXCHANGE DYNAMICS OF GOBS WITH MINING AIR AND SURFACE LAYER OF ATMOSPHERE

It is noted that filtration and diffusion processes in coal seams, worked-out spaces and workings of carbon dioxide mines are satisfactorily described by parabolic filtration equations for one-dimensional semi-infinite space. Linearization of the equations of filtration gas transport allows obtaining analytical solutions for a wide class of applied problems. A model has been developed for the movement of dead air through underworked rocks from mined-out areas to the earth's surface for the conditions of the Eastern Donbass and Kuzbass. At a stable atmospheric pressure, gas exchange occurs in a diffusion mode. The dependence of the diffusion flow of gases from the worked-out space to the earth's surface is obtained. Dependencies for the forecast of methane release on the earth's surface of allotments of the liquidated mines of Kuz-Bass are obtained.

Download Full-text

Gas Exchange

10.1093/med/9780190670085.003.0002 ◽

2017 ◽

Author(s):

John W. Kreit

Keyword(s):

Carbon Dioxide ◽

Gas Exchange ◽

Partial Pressure ◽

Capillary Blood ◽

Pressure Gradients ◽

Arterial Blood ◽

Pulmonary Capillary ◽

Partial Pressures ◽

Pulmonary Capillary Blood ◽

And Diffusion

Gas Exchange explains how four processes—delivery of oxygen, excretion of carbon dioxide, matching of ventilation and perfusion, and diffusion—allow the respiratory system to maintain normal partial pressures of oxygen (PaO2) and carbon dioxide (PaCO2) in the arterial blood. Partial pressure is important because O2 and CO2 molecules diffuse between alveolar gas and pulmonary capillary blood and between systemic capillary blood and the tissues along their partial pressure gradients, and diffusion continues until the partial pressures are equal. Ventilation is an essential part of gas exchange because it delivers O2, eliminates CO2, and determines ventilation–perfusion ratios. This chapter also explains how and why abnormalities in each of these processes may reduce PaO2, increase PaCO2, or both.

Download Full-text

Occupation time theorems for one-dimensional random walks and diffusion processes in random environments

Stochastic Processes and their Applications ◽

10.1016/j.spa.2008.02.005 ◽

2009 ◽

Vol 119 (2) ◽

pp. 347-372

Author(s):

Yuji Kasahara ◽

Shinzo Watanabe

Keyword(s):

Random Walks ◽

Diffusion Processes ◽

Occupation Time ◽

Random Environments ◽

One Dimensional ◽

And Diffusion

Download Full-text

Displacement of Slow-Turnover DNA Glycosylases by Molecular Traffic on DNA

Genes ◽

10.3390/genes11080866 ◽

2020 ◽

Vol 11 (8) ◽

pp. 866

Author(s):

Anna V. Yudkina ◽

Anton V. Endutkin ◽

Eugenia A. Diatlova ◽

Nina A. Moor ◽

Ivan P. Vokhtantsev ◽

...

Keyword(s):

Dna Polymerase ◽

Excision Repair ◽

Klenow Fragment ◽

Dna Glycosylases ◽

Diffusion Mode ◽

One Dimensional ◽

Obstacle Clearance ◽

Base Excision ◽

And Diffusion ◽

Slow Turnover

In the base excision repair pathway, the initiating enzymes, DNA glycosylases, remove damaged bases and form long-living complexes with the abasic DNA product, but can be displaced by AP endonucleases. However, many nuclear proteins can move along DNA, either actively (such as DNA or RNA polymerases) or by passive one-dimensional diffusion. In most cases, it is not clear whether this movement is disturbed by other bound proteins or how collisions with moving proteins affect the bound proteins, including DNA glycosylases. We have used a two-substrate system to study the displacement of human OGG1 and NEIL1 DNA glycosylases by DNA polymerases in both elongation and diffusion mode and by D4, a passively diffusing subunit of a viral DNA polymerase. The OGG1–DNA product complex was disrupted by DNA polymerase β (POLβ) in both elongation and diffusion mode, Klenow fragment (KF) in the elongation mode and by D4. NEIL1, which has a shorter half-life on DNA, was displaced more efficiently. Hence, both possibly specific interactions with POLβ and nonspecific collisions (KF, D4) can displace DNA glycosylases from DNA. The protein movement along DNA was blocked by very tightly bound Cas9 RNA-targeted nuclease, providing an upper limit on the efficiency of obstacle clearance.

Download Full-text

On the identification of systems and the unscrambling of data III: One-dimensional wave and diffusion processes

Journal of Mathematical Analysis and Applications ◽

10.1016/0022-247x(68)90125-x ◽

1968 ◽

Vol 23 (1) ◽

pp. 173-182 ◽

Cited By ~ 8

Author(s):

R Bellman ◽

D Detchmendy ◽

H Kagiwada ◽

R Kalaba

Keyword(s):

Diffusion Processes ◽

One Dimensional ◽

And Diffusion ◽

Dimensional Wave

Download Full-text

A Necessary Characteristic Equation of Diffusion Processes Having Gaussian Marginals

Abstract and Applied Analysis ◽

10.1155/2012/598590 ◽

2012 ◽

Vol 2012 ◽

pp. 1-9

Author(s):

Syeda Rabab Mudakkar

Keyword(s):

Fourier Transform ◽

Diffusion Process ◽

Characteristic Equation ◽

Diffusion Coefficients ◽

Diffusion Processes ◽

Kolmogorov Equation ◽

Marginal Density ◽

Operator Approach ◽

One Dimensional ◽

And Diffusion

The aim of this work is to characterize one-dimensional homogeneous diffusion process, under the assumption that marginal density of the process is Gaussian. The method considers the forward Kolmogorov equation and Fourier transform operator approach. The result establishes the necessary characteristic equation between drift and diffusion coefficients for homogeneous and nonhomogeneous diffusion processes. The equation for homogeneous diffusion process leads to characterize the possible diffusion processes that can exist. Two well-known examples using the necessary characteristic equation are also given.

Download Full-text

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

International Astronomical Union Colloquium ◽

10.1017/s0252921100080477 ◽

1976 ◽

Vol 32 ◽

pp. 109-116 ◽

Cited By ~ 1

Author(s):

S. Vauclair

Keyword(s):

Convection Zone ◽

Diffusion Processes ◽

Meridional Circulation ◽

Diffusion Time ◽

Work In Progress ◽

First Results ◽

Stellar Envelopes ◽

And Diffusion ◽

Turbulence And Diffusion ◽

Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

Download Full-text

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069387 ◽

1970 ◽

Vol 28 ◽

pp. 478-479

Author(s):

Teruo Someya ◽

Jinzo Kobayashi

Keyword(s):

Surface Layer ◽

Electric Fields ◽

Quantitative Study ◽

Recent Progress ◽

Ferroelectric Domain ◽

Resolving Power ◽

Surface Pattern ◽

Crystal Surfaces ◽

One Dimensional ◽

Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

Download Full-text