Investigation of processes occurring at cathodically protected underground installations: Mathematical modeling of reaction transport processes in soil

2017 ◽  
Vol 120 ◽  
pp. 28-41 ◽  
Author(s):  
Roman Kodým ◽  
Dalimil Šnita ◽  
Vlastimil Fíla ◽  
Karel Bouzek ◽  
Milan Kouřil
Keyword(s):  
Mathematical Modeling ◽  
Transport Processes ◽  
Reaction Transport

On the upscaling of reaction-transport processes in porous media with fast or finite kinetics

2002 ◽  
Vol 57 (13) ◽  
pp. 2565-2577 ◽  
Author(s):  
Persefoni E. Kechagia ◽  
Ioannis N. Tsimpanogiannis ◽  
Yanis C. Yortsos ◽  
Peter C. Lichtner
Keyword(s):  
Porous Media ◽  
Transport Processes ◽  
Reaction Transport

Mathematical Modeling of the Unit Load Formation

2013 ◽  
Vol 309 ◽  
pp. 358-365 ◽  
Author(s):  
Béla Illés ◽  
Gabriella Bognár
Keyword(s):  
Mathematical Modeling ◽  
Supply Chain ◽  
Significant Role ◽  
Mathematical Description ◽  
Raw Materials ◽  
Transport Processes ◽  
Optimization Process ◽  
Objective Functions ◽  
Unit Load ◽  
Major Factors

A fast and efficient way of handling and storing components, raw materials, semi-finished and finished products play a significant role in the development of transport, storage and distribution design within the supply chain. One of the most important issues in storage and transport processes is the formation of unit loads. Our main goal is to give a mathematical description of a model involving the major factors of the unit load formation. The optimization process is exhibited applying the determined objective functions and constraints related to the basic tasks.

scholarly journals Mean Transit Time and Mean Residence Time for Linear Diffusion–Convection–Reaction Transport System

2007 ◽  
Vol 8 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Jacek Waniewski
Keyword(s):  
Exit Time ◽  
Mean Transit Time ◽  
Reaction Diffusion ◽  
Transport Processes ◽  
Linear Diffusion ◽  
Transit Times ◽  
Linear Reaction ◽  
Analytical Formulas ◽  
Reaction Transport ◽  
Diffusion Convection

Characteristic times for transport processes in biological systems may be evaluated as mean transit times (MTTs) (for transit states) or mean residence times (MRT) (for steady states). It is shown in a general framework of a (linear) reaction–diffusion–convection equation that these two times are related. Analytical formulas are also derived to calculate moments of exit time distribution using solutions for a stationary state of the system.

scholarly journals Speed of reaction-transport processes

2001 ◽  
Vol 64 (1) ◽  
Author(s):  
Vicenç Méndez ◽  
Joaquim Fort
Keyword(s):  
Transport Processes ◽  
Reaction Transport

scholarly journals On the Upscaling of Reaction-Transport Processes in Porous Media with Fast Kinetics

2001 ◽  
Author(s):  
P. Kechagi ◽  
I. Tsimpanogiannis ◽  
Y.C. Yortsos ◽  
P. Lichtner
Keyword(s):  
Porous Media ◽  
Transport Processes ◽  
Fast Kinetics ◽  
Reaction Transport

SAFETY SUPPORT IN TRANSPORT CONSTRUCTION MACHINERY WITH HYDRAULIC DRIVE

2021 ◽  
Vol 2021 (7) ◽  
pp. 38-49
Author(s):  
Evgeniy Khristoforov ◽  
Nataliya Sakovich ◽  
Aleksandr Kuznecov
Keyword(s):  
Mathematical Modeling ◽  
Construction Industry ◽  
System Analysis ◽  
Time Moment ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Transport Processes ◽  
Construction Machinery ◽  
Motion Parameters ◽  
The Impact

Work purpose: the investigation of transport process safety in construction industry of the Bryansk region, the substantiation of reasons, factors and circumstances of accidents in the construction companies of the region, the substantiation of the impact of hydraulic drive unit failures upon safety of transport construction machinery with the hydraulic drive with the purpose of driver safety. Investigation problem: on the basis of the obtained results of the safety investigations of transport processes, reasons defined, revealed injury factors of drivers during the operation of the load flat car hydraulic drive of transport means to develop motion parameters of the “hydraulic drive-load flat car” system which will not allow arising oscillations of the system resulting in hydraulic drive failure arising which has influence upon driver’s work safety. The investigations were carried out on the basis of a system analysis of accident examinations in the regional construction industry which on the basis of statistical data allows the defining safety state of transport construction machinery. By means of investigations it is defined that 90% of transport construction machines are equipped with a hydraulic drive. In the hydraulic drive the most significant element is a hydraulic cylinder – the most loaded element performing all basic operations of a working process of loading and unloading. In the hydraulic drive there is used a telescopic hydraulic cylinder in which during operation there are revealed design-production defects (DPD) which result in injury of machine service personnel. One of DPD manifestations is oscillation formation in the hydraulic drive which results in the destruction of hydraulic cylinder attachment fitting. It is defined that the support of hydraulic drive reliability and safety is a difficult problem which needs a complex solution still at designing and creation, and during the operation. The complexity of the problem causes the necessity of design and operation parameter optimization, in the first place, that of an executing hydraulic cylinder of the hydraulic drive with the use of mathematical modeling. The review of the mathematical modeling methods of hydraulic cylinder parameters allows drawing the conclusion that the existing methods have many assumptions and do not allow creating completely reliable and safe transport construction engineering. The investigation novelty consists in the offered procedure for the solution of motion equations of the “hydraulic drive – load flat car” system which allows calculating the motion system parameters, defining the development of system oscillation above critical able to destruct a fitting unit of the hydraulic cylinder to the load flat car. Conclusion. The algorithm offered for the solution of mathematical equations allows making a conclusion on the stability and safety of the “hydraulic cylinder – load flat car” system, finding optimum values of motion parameters at any time moment of a transitional process.

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