scholarly journals Durability Control of Brickwork's Material Including Operation Parameters of the Building Enclosure

2021 ◽  
Vol 8 (6) ◽  
pp. 871-880
Author(s):  
Dmitry Zheldakov ◽  
Radik Mustafin ◽  
Vladimir Kozlov ◽  
Askar Gaysin ◽  
Dmitriy Sinitsin ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Chemical Processes ◽  
Laboratory Research ◽  
Material Degradation ◽  
Chemical Corrosion ◽  
Building Enclosure ◽  
Building Enclosures ◽  
The Subject ◽  
Operation Parameters ◽  
Material Durability

This paper aims to develop a method to determine material durability based on physicochemical laws that describe chemical corrosion in building enclosures. The subject of this research is studying the chemical corrosion in the material in building constructions. The object of this research is the material of building ceramics. Methods that the authors used for reaching this goal include developing a multi-staged process of material degradation of building ceramics, conduction of thermodynamic calculations, and conducting laboratory research on process kinetics. The results of kinetic researches are generalized based on a developed mathematical model. This comprehensive approach to solving the goal task allowed obtaining the following results: research methods of chemical processes in brick material and its plaster on humidification were developed. A mathematical model for evaluating material degradation in time with the changing climatic influence on enclosure was developed.

Contribution to the Research and Development of Radiation Chambers in Steam Reforming. Problem-Oriented Application of a Fuzzy Expert System

1992 ◽  
Vol 57 (10) ◽  
pp. 2125-2134 ◽  
Author(s):  
Petr Stehlík ◽  
František Babinec
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Expert System ◽  
Service Life ◽  
Research And Development ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Chemical Processes ◽  
Fuzzy Expert System ◽  
Present Contribution

An application of a fuzzy expert system intended for estimating some parameters of steam reforming can also be one of the examples of an ever increasing utilization of expert systems in practice. The present contribution deals with the method making use of a verified mathematical model for simulating thermal chemical processes in reforming furnace radiation chamber in order to create knowledge base. This base includes linguistic values of selected independent and dependent variable quantities. Examples given illustrate an evaluation of dependent variable quantities (methane conversion into carbon dioxide and monoxide, reaction tube service life) by means of the said expert system based on queries.

Reactions

2011 ◽  
Author(s):  
Peter Atkins
Keyword(s):  
Chemical Reactions ◽  
Molecular Level ◽  
Chemical Processes ◽  
Chemical Formula ◽  
Complex Processes ◽  
Full Color ◽  
Chemistry Textbooks ◽  
Simple Chemical ◽  
The Subject ◽  
Solid Form

Illustrated with remarkable new full-color images--indeed, one or more on every page--and written by one of the world's leading authorities on the subject, Reactions offers a compact, pain-free tour of the inner workings of chemistry. Reactions begins with the chemical formula almost everyone knows--the formula for water, H2O--a molecule with an "almost laughably simple chemical composition." But Atkins shows that water is also rather miraculous--it is the only substance whose solid form is less dense than its liquid (hence ice floats in water)--and incredibly central to many chemical reactions, as it is an excellent solvent, being able to dissolve gases and many solids. Moreover, Atkins tells us that water is actually chemically aggressive, and can react with and destroy the compounds dissolved in it, and he shows us what happens at the molecular level when water turns to ice--and when it melts. Moving beyond water, Atkins slowly builds up a toolkit of basic chemical processes, including precipitation (perhaps the simplest of all chemical reactions), combustion, reduction, corrosion, electrolysis, and catalysis. He then shows how these fundamental tools can be brought together in more complex processes such as photosynthesis, radical polymerization, vision, enzyme control, and synthesis. Peter Atkins is the world-renowned author of numerous best-selling chemistry textbooks for students. In this crystal-clear, attractively illustrated, and insightful volume, he provides a fantastic introductory tour--in just a few hundred colorful and lively pages - for anyone with a passing or serious interest in chemistry.

Heat Liberation and Transmission in Large Steam-Generating Plants

1933 ◽  
Vol 125 (1) ◽  
pp. 201-289
Author(s):  
E. W. Robey ◽  
W. F. Harlow
Keyword(s):  
Heat Liberation ◽  
Dew Point ◽  
Flue Gases ◽  
Plant Performance ◽  
Laboratory Research ◽  
Frictional Loss ◽  
Boiler Plant ◽  
Recent Developments ◽  
The Subject ◽  
Secondary Air

The demand for heavier duties and exacting guarantees of performance which has accompanied recent developments in steam-raising plants, has necessitated closer inquiry into the fundamental principles on which their performance depends. The authors present their views on certain aspects of the subject. These have been formed as a result of experience, combined with a consideration of the work of laboratory investigators. It would appear that important facts revealed by laboratory research do not always receive the attention due to them, and frequently erroneous ideas persist for years without question. The paper discusses the function of the chain grate mechanical stoker with particular reference to the subject of furnace design and secondary air application. It deals with the effect on the size and cost of equipment generally, which would result from a closer observance of the laws of heat transfer and frictional loss in flowing gases, and discusses particularly the phenomenon of delayed heat release in flue gases and the effect of this in boiler plant performance. The cause and prevention of air heater corrosion is dealt with, and the results of investigations into the dew point temperature of flue gases are given.

scholarly journals "REAL" ENGINEERING FOR A MULTI-DISCIPLINARY 1ST YEAR PROJECT/DESIGN COURSE APSC100

2011 ◽  
Author(s):  
Barrie Jackson
Keyword(s):  
Broad Spectrum ◽  
Chemical Processes ◽  
Modern World ◽  
First Year ◽  
Project Design ◽  
Basic Sciences ◽  
First Year Students ◽  
Career Experience ◽  
The Subject ◽  
Engineering Career

Queen’s University has a common first year for engineering. A few years ago a project/design course was introduced, APSC100, which has been quite successful. It was predicated on the fact that students who are attracted to engineering are really excited about the possibility of “doing engineering” early in their student experience. The design of Chemical processes is something that few if any first year students have any appreciation of. We are in the process of developing a project for APSC100 which will introduce the subject as well as have the students work with a commercial FlowSheet simulator. We believe that simulators “warts and all (1)” can be an excellent learning tool, and exposure to these programs is essential as they have become so much a part of today’s engineering career experience. Commercial Flowsheet simulators continue to be a challenge for people with many years familiarity with these systems. There is however a potential for a great deal of learning about the “design process” by the use of these tools, provided these tools are presented in such a way as to be challenging but not intimidating. The paper will describe the approach to developing the APSC100 module, the challenges faced and the anticipated solutions. One particular problem will be developing something that will interest a broad spectrum of students. It has been noted that “Chemistry” often seems to be a subject that is avoided by many. This module will hopefully demonstrate the fact that “Chemistry” is one of the basic sciences and how it is the basis for much of the product of the modern world. Since this is a “work-in-progress” we anticipate and welcome suggestions as to how to present a successful module to our students.

scholarly journals Development of condenser mathematical model for research and development of ways to improve its efficiency

2020 ◽  
Vol 18 (4) ◽  
pp. 578-585
Author(s):  
Madina Shavdinova ◽  
Konstantin Aronson ◽  
Nina Borissova
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Water Temperature ◽  
Steam Turbine ◽  
Cooling Water ◽  
Laboratory Research ◽  
Thermal Engineering ◽  
Linear Regression Method ◽  
Cooling Water Temperature ◽  
The Mathematical Model

The condensing unit is one of the most important elements of the steam turbine of a combined heat and power plant. Defects in elements of the condensing unit lead to disturbances in the steam turbine operation, its failures and breakdowns, as well as efficiency losses of the plant. Therefore, the operating personnel need to know the cause of the malfunction and to correct it immediately. There are no diagnostic models of condensers in the Republic of Kazakhstan at the moment. In this regard, a mathematical model of a condenser based on the methodology of Kaluga Turbine Plant (KTP) has been developed. The mathematical model makes it possible to change the input parameters, plot dependency diagrams, and calculate the plant efficiency indicators. The mathematical model of the condenser can be used to research ways for the improvement of the condensing unit efficiency, for diagnostic purposes of the equipment condition, for the energy audit conduction of the plant, and in the training when performing virtual laboratory research. Using static data processing by linear regression method we obtain that the KTP methodology of condenser calculation is fair at cooling water temperature from 20 °C to 24 °C, but at cooling water temperature from 20 °C to 28 °C, the methodology of JSC "All-Russia Thermal Engineering Institute" (JSC "VTI") is used. One of the ways to increase the condenser efficiency has been proposed. It is the heat transfer augmentation with riffling annular grooves on tubes. This method increases the heat transfer coefficient by 2%, reduces the water subcooling of the heating steam by 0.9 °C, and decreases the cooling area by 2%.

scholarly journals Development of a mathematical model of diesel-generator units with a valve-inductor generator

2021 ◽  
Vol 2057 (1) ◽  
pp. 012076
Author(s):  
V A Zhigarev ◽  
A V Minakov ◽  
D V Guzei ◽  
M I Pryazhnikov ◽  
V I Panteleev
Keyword(s):  
Mathematical Model ◽  
Calculated Data ◽  
Power Losses ◽  
Diesel Generator ◽  
Fuel Injectors ◽  
Operating Modes ◽  
Effective Operation ◽  
Generator Unit ◽  
Operation Parameters

Abstract The paper presents a comprehensive mathematical model of a diesel-generator units with a valve-inductor generator. The calculated data obtained using this model allows optimizing the operation of fuel injectors and adjust the injection characteristics. The electromagnetic part of the model allows taking into account the power losses and efficiency of the generator, calculating the phase windings and their connection schemes, methods for setting the voltage or current of any shape that feeds the windings of the valve-inductor generator, as well as the characteristics of the rotor, stator, and winding materials to obtain the most effective operation parameters of the engine in various operating modes as part of the generator unit.

Introduction

2019 ◽  
pp. 1-6
Author(s):  
James W. Jones
Keyword(s):  
Meaning Making ◽  
Laboratory Research ◽  
Psychological Perspective ◽  
Central Question ◽  
Meaning Systems ◽  
Human Understanding ◽  
The Subject ◽  
Psychological Paradigms ◽  
The Impact

This text is a dialogue between psychology and theology. In different ways, they both deal with understanding the religiously lived life and with the question of whether there is any validity to living that kind of life. The central question of the book is whether it is meaningful and reasonable to speak of a “spiritual sense,” whether there are ways we can “sense” or perceive the reality of God. The first chapter develops an “embodied-relational” approach to human understanding by drawing on two very different psychological paradigms: clinical psychoanalysis and laboratory research into the role embodiment plays in human understanding. The second chapter builds on this review of the empirical findings to discuss some of their implications for the traditional and virtually universal theological topic of human nature. A popular approach to thinking about religion from a psychological perspective is to treat religions as “meaning systems.” The research cited here suggests that our embodiment directly impacts our understanding of how meanings are arrived at, thus affecting how we understand religious meaning-making—the subject of chapter three. The fourth chapter examines the impact of our embodiment on studying and understanding religion. The fifth chapter explores a case for a “spiritual sense” grounded in an embodied approach to human understanding.

Real-Time Multi-Body Software for HIL Simulations

2010 ◽  
Author(s):  
Paolo Righettini ◽  
Alberto Oldani
Keyword(s):  
Mathematical Model ◽  
Embedded Systems ◽  
Design Process ◽  
Hardware In The Loop ◽  
Real Behavior ◽  
Hardware Component ◽  
General Mathematical Model ◽  
The Subject ◽  
Complex Mechanical Systems ◽  
Multi Body

The Hardware in the Loop simulation is an useful instrument to simulate complex mechanical systems in which the subject of the test is an hardware component. The results of the simulation, closer to the real behavior of the system, are the main advantage of this approach. This application is often used during the design process to test components of a complex mechanical system before the development of the prototype (e.g. embedded systems). The literature examples show, in general, mathematical model finalized to the application. The objective of this work is focused on the development of a generic Multi-Body software for HIL applications. Some simulations examples, the dynamic of a slider-crank and of a McPherson suspension, are presented at the end of the paper.

scholarly journals II. The convolutional pattern of the brains of identical twins: a study on hereditary resemblance in the furrows of the cerebral hemispheres

1918 ◽  
Vol 208 (348-359) ◽  
pp. 37-61 ◽  
Keyword(s):  
Royal Society ◽  
Identical Twins ◽  
Laboratory Research ◽  
Scientific Interest ◽  
Correct Description ◽  
Research Committee ◽  
Points Of Interest ◽  
History Of ◽  
The Subject ◽  
Scientific Value

The study of the similarity of the convolutional pattern of the brains of relatives has been the subject of considerable attention in the Pathological Laboratory at Claybury, under the direction of Dr. F. W. Mott. At his request Dr. Fisher has been forwarding to the Laboratory a number of fœtuses and children born dead that have occurred in his practice at Shoreditch Infirmary. It has thus happened that full term identical twins came into Dr. Mott’s possession. Realising the scientific value of a correct description of the similarity of the convolutional pattern in the brains of these twins, he has handed them to me and I have carefully studied the same on the lines previously adopted by Schuster in his description of the brains of relatives dying in the London Asylums. I have also made a study of the nervous plexuses and other morphological points of interest. I have been able to give my whole attention to laboratory research owing to the liberal grant made by the Medical Research Committee, and this study is a small part of the work which I have accomplished during the last year. But it was thought by the Director to be of sufficient scientific interest to present to the Royal Society, especially having regard to its being a morphological contribution to the important observations of the late Sir Francis Galton on the history of twins.

Heat and Mass Transfer Analysis of Fabric in the Tenter Frame

1997 ◽  
Vol 67 (5) ◽  
pp. 311-316 ◽  
Author(s):  
Sang Il Park ◽  
Doo Hyun Baik
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Finite Difference Method ◽  
Moisture Content ◽  
Heat And Mass Transfer ◽  
Initial Moisture Content ◽  
Transfer Coefficients ◽  
Operation Parameters ◽  
The Finite Difference Method ◽  
Experimental Values

A mathematical model is developed for heat and mass transfer analysis of fabric in the tenter frame. Using the model, the calculated transient fabric temperatures in the tenter frame agree well with the experimental values measured by Beard. Variations in temperature and moisture content distribution are solved using the finite-difference method. The effects of operation parameters, such as temperature and humidity in the tenter, initial moisture content of the fabric, and heat and mass transfer coefficients, are examined using the model.

Sign in / Sign up

Export Citation Format

Share Document