scholarly journals LANDSCAPES OF FLOODS: THE CONCEPT AND METHODS OF CALCULATIONS

2020 ◽  
pp. 70-75
Author(s):  
A.T. Naprasnikov
Keyword(s):  
Methods Of Calculations

scholarly journals TECHNICAL CONDITION OF PRECAST BEAMS WITH THE USE OF EXPANDED LIGHTWEIGHT CONCRETE HOLLOW-CORE SLABS

2019 ◽  
pp. 35-42
Author(s):  
Г. Смоляго ◽  
G. Smolyago ◽  
С. Дрокин ◽  
S. Drokin ◽  
А. Дронов ◽  
...  
Keyword(s):  
Lightweight Concrete ◽  
Significant Proportion ◽  
Physical And Mechanical Properties ◽  
Technical Condition ◽  
Building Structures ◽  
Hollow Core ◽  
Shear Cracks ◽  
Total Load ◽  
Normative Documents ◽  
Methods Of Calculations

The use of expanded lightweight concrete for the production of building structures can significantly reduce the weight, which is important in the manufacture of hollow-core slabs; the weight is a significant proportion of the total load. In the current regulatory documents, the physical and mechanical properties of expanded lightweight concrete differ significantly, and sometimes contradict each other. The defects and damages of expanded lightweight concrete hollow-core slabs are described in the case of the kindergarten built near 50 years ago. They appeared during the manufacture of the slabs - uncompacted concrete and uncovered ribs, or in the course of exploitation of the building - normal cracking, holes for pipes and corrosion of reinforcement. Two slabs in emergency condition have numerous longitudinal and shear cracks and chips of concrete caused by overloading. The differences in normative documents and methods of calculations used at the time of designing the kindergarten building and at the present time are shown. The assessment of the technical condition of the expanded lightweight concrete hollow-core slabs considering defects and damages are carried out

scholarly journals ORGANIZATIONAL AND ECONOMIC ASPECTS OF IMPROVING SUBURBAN RAILWAY TRANSPORTATION

2019 ◽  
pp. 67-74
Author(s):  
A. V. Kurbatova ◽  
D. A. Plotnikova
Keyword(s):  
Statistical Data ◽  
Economic Condition ◽  
Rail Transport ◽  
Railway Transport ◽  
Railway Transportation ◽  
Financial Condition ◽  
Methodical Approach ◽  
The Russian Federation ◽  
Suburban Railway ◽  
Methods Of Calculations

The features of management of domestic railway transport at different stages of its development have been disclosed. The main principles and conditions of structural reform in the industry have been formulated. The main models of management of the railway complex, principles and features of the organization of suburban railway communication in different countries have been characterized. Statistical data on suburban rail transport on the infrastructure of JSC «Russian Railways», confirming their importance and significance for the Russian Federation, have been adduced. The economic results of the activity of domestic suburban passenger companies have been considered. The shortcomings of the existing methodology for assessing the financial condition of suburban passenger companies have been indicated. The proposals to improve the current methods of calculations taking into account the conditions of prospective development of companies have been given. The scheme of scientific and methodical approach to the analysis of economic condition of the suburban passenger companies, including set of procedures of calculated and analytical character, has been offered.

scholarly journals Improvement of Methods of Calculations of Flood Water Passing Through Medium-Pressure Hydro Units Taking Into Ac-Count the Characteristics of Flood Wave

2021 ◽  
Vol 43 (2) ◽  
pp. 97-107
Author(s):  
A.V. Panasenko ◽  
◽  
Keyword(s):  
Flood Wave ◽  
Flood Water ◽  
Mike 11 ◽  
Medium Pressure ◽  
Methods Of Calculations

Створено гідродинамічну модель руху паводкових вод на ділянці р. Дністер від гідро­ло­гічного поста Заліщики до Дністровського гідровузла у програмному комплексі MIKE 11. Модель дає змогу визначити рівні у Дністровському водосховищі у будь-який момент часу у вигляді кривих вільної поверхні при пропуску паводків різної забез­печеності. Методика розрахунків пропуску паводків через Дністровський гідровузол на основі прогнозів приточності води з урахуванням характеристик паводкової хвилі та ре­жиму наповнення водосховища дає можливість зменшити максимальні витрати води під час паводкової хвилі через Дністровський гідровузол.

scholarly journals An Alternative Simulation Method for Calculation of Microgas Flows under Flying Head Sliders

2009 ◽  
Vol 2009 ◽  
pp. 1-10 ◽  
Author(s):  
Ching Shen
Keyword(s):  
Reynolds Equation ◽  
Simulation Method ◽  
Air Bearing ◽  
Bearing Surface ◽  
Rotating Disc ◽  
Information Preservation ◽  
Precise Knowledge ◽  
Micrometer Size ◽  
Methods Of Calculations ◽  
Generalized Reynolds Equation

The precise knowledge of the force and moment generated by the air squeezed under the read-write slider by the rotating disc is an engineering necessity in designing the air bearing surface slider. This paper reviews methods addressing the thin gas film bearings problem. It firstly reviews briefly the relatively well-known two methods of calculations of the microgas flows under flying head sliders, the generalized Reynolds equation, having given a number of useful results of slider design, and the DSMC method, which is precise and appropriate for the flow of complex configurations but is restricted to miniature (~micrometer) size sliders. The main purpose of the paper is to introduce to the reader an alternative method, the information preservation (IP) method, for use in simulation of the flows under air bearing surfaces. Some recent results of IP simulation of slider flows published on conference proceedings are introduced here.

scholarly journals High accuracy computational methods for behavioral modeling of thick-film resistors at cryogenic temperatures

2016 ◽  
Vol 34 (1) ◽  
pp. 212-225 ◽  
Author(s):  
Franciszek Balik ◽  
Andrzej Dziedzic
Keyword(s):  
Low Temperature ◽  
Thick Film ◽  
Behavioral Modeling ◽  
Cryogenic Temperatures ◽  
Exact Methods ◽  
Modeling Errors ◽  
Multidimensional Approximation ◽  
Computational Procedures ◽  
Freezing Liquid ◽  
Methods Of Calculations

AbstractThe aim of this work was to elaborate two-dimensional behavioral modeling method of thick-film resistors working in low-temperature conditions. The investigated resistors (made from 5 various resistive inks: 10 resistor coupons, each with 36 resistors with various dimensions), were measured automatically in a cryostat system. The low temperature was achieved in a nitrogen-helium continuous-flow cryostat. For nitrogen used as a freezing liquid the minimal temperature possible to achieve was equal to −195.85 °C (77.3 K). Mathematical model in the form of a multiplication of two polynomials was elaborated based on the above mentioned measurements. The first polynomial approximated temperature behavior of the normalized resistance, while the second one described the dependence of resistance on planar resistors dimensions. Special computational procedures for multidimensional approximation purpose were elaborated. It was shown that proper approximation polynomials and sufficiently exact methods of calculations ensure acceptable modeling errors.

scholarly journals ANALYSIS OF CALCULATION METHODS USED FOR ACCURACY EVALUATION OF THE RESULTS OF ROAD ACCIDENT EXAMINATION

Transport ◽  
2008 ◽  
Vol 23 (2) ◽  
pp. 156-160 ◽  
Author(s):  
Saulius Nagurnas ◽  
Valentinas Mickūnaitis ◽  
Robertas Pečeliūnas ◽  
Aurelijus Vestartas
Keyword(s):  
Road Accident ◽  
Accuracy Evaluation ◽  
Road Accidents ◽  
Mathematical Methods ◽  
Main Attention ◽  
Calculated Parameter ◽  
Braking Distance ◽  
Mathematical Equations ◽  
Methods Of Calculations

For examination of road accidents often calculations are being performed according to mathematical equations having many variables, real values of which are of stochastic nature and they depend on many accident factors. Therefore it is important to know limits of determination of final values of every being analysed parameter of car movement and their probabilistic characteristics. This paper presents some cases of simulation of some road situations by mathematical methods of calculations, which now are widely used for evaluation of accuracy of values of the calculated parameter (in this paper ‐ the braking distance). Also here is presented some analysis of these methods. The paper presents the following cases of car braking: braking with making attempts to prevent a collision with another car, braking through impact‐to‐pedestrian prevention and conventional (rectilinear) car braking. The main attention in the analysis of the mentioned road situations is paid to veracity of the car braking distance, i.e. to limits of variation of values of this parameter and also to influence of accidental factors on the final result which is being looked for. Some conclusions on the expediency of application of the described methods of calculations to analysis of road accidents are present.

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