Wyniki wyszukiwania - Biblioteka Nauki

1

Synthesis and Evaluation Analysis of the Indicator Information in Nuclear Safeguards Applications by Computing With Words

100%

Liu J. , Ruan D. , Carchon R.

International Journal of Applied Mathematics and Computer Science

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2002

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tom Vol. 12, no 3

449-462

EN

This paper aims at the handling and treatment of nuclear safeguard relevant information by using a linguistic assessment approach. This is based on a hierarchical analysis of a State's nuclear activities in a multi-layer structure of the evaluation model. After a hierarchical analysis of the State's nuclear activities on the basis of the IAEA Physical Model, the addressed objective is divided into several less complex levels. The overall evaluation can be obtained step by step from those lower levels. Special emphasis is put on the synthesis and evaluation analysis of the Physical Model indicator information. Accordingly, the aggregation process with the consideration of the different kinds of qualitative criteria is in focus. Especially, the symbolic approach is considered by the direct computation on linguistic values instead of the approximation approach using the associated membership function. In this framework, several kinds of ordinal linguistic aggregation operators are presented and analyzed. The application of these linguistic aggregation operators to the combination of the Physical Model indicator information is provided. An example is given to support and clarify the mathematical formalism.

2

Hydraulic Research of Sediment Transport in the Vertical Slot Fish Passes

100%

Mumot J. , Tymiński T.

Journal of Ecological Engineering

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2016

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tom Vol. 17, nr 1

143--148

EN

The physical model of vertical slot fishway was conducted. On the fishway a device used for sediment dispense was installed. The sediment was dispensed to each chamber. Measurements of approx. height of the water table, measurements of flow rate, observation of line streams in chambers were carried out during the studies. The flows of sediment and hydraulic parameters inside designed fishway, single compartments and their connection with sedimentation process in individual chambers were also studied. the obtained research results constitute starting point for experimental analyses and research analyses. Based on the observation and measurements it is possible to state that the constructed physical model reflects the activity conditions of the vertical slot fishway. During the studies a place of deposition in sediments of individual fishway chambers were determined.

3

The innovative post-weld finishing method and non-standard cutting tool for carrying out this method

100%

Dvirna O.

Acta Mechanica et Automatica

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2024

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tom Vol. 18, no. 1

22--28

EN

The most common method of post-weld finishing is grinding with an abrasive tool. This finishing method leads to the occurrence of faults on the treated surface: locations missed or hardened twice, structural notches and stretching residual stress in the surface layer. The faults mentioned lead to the creation and development of ordinary as well as fatigue cracks, seizing or other damage. In addition, grinding is a process that often involves manual labour, which significantly increases the time required for finishing the procedure. Moreover, it is impossible to automate this process. Also, grinding is a process that is damaging for both people and the environment. In contrast to grinding and other processes of post-weld surface finishing, the innovative method, which is the subject of this article, does not have the faults and inconveniences of the previously mentioned techniques. The post-weld surface finishing method by moving of the innovative multi-edge cutting tool along the weld bead is presented in this article. In this method, machining allowance is treated as the weld bead height, which is flush-removed with the base material in one step during one pass of the cutting tool. The adjacent teeth height of changing and increasing according to the direction of feed and the difference in height between the first and last teeth are equal to the weld bead height. The number of cutting teeth necessary to flush-finish the weld bead with the base metal surface depends on the difference in the first and last teeth height and how it is divided. The tooth length is greater than half of the distance between the adjacent cutting teeth, which enables finishing the heterogeneous post-weld surface with many defects and increased hardness. The innovative method is characterised by short machining time of the weld bead and provides an accurate, efficient and economical process.

4

The analysis of factors influencing the dynamics of lowland riverbed erosion downstream of the Jeziorsko reservoir dam (central Poland)

100%

Smaga A. , Wierzbicki J. , Wierzbicki M. , Hämmerling M. , Radaszewski R.

Geological Quarterly

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2017

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tom Vol. 61, No. 4

926--933

EN

Increased riverbed erosion could recently be observed in close vicinity of hydrotechnical constructions in many lowland rivers. The immediate effect of erosion in this case is a very significant reduction of the riverbed level over a considerable distance, downstream of large reservoir dams. This process is influenced simultaneously by both hydraulics of river flow and geotechnical properties of soil eroded. The paper presents an analysis of parametric changes in the level of river bottom and grain size of bed material, and the relative density in the context of changes in hydrological conditions and diversity of engineering-geological conditions. As the result, a multiparametric model of erosional potential of riverbed sediments has been proposed, which can significantly help in proper planning of locations and construction of correction thresholds under given hydraulic conditions of the river.

5

Numerical study of wave transmission over double submerged breakwaters using non-hydrostatic wave model

100%

Liang B. , Wu G. , Liu F. , Fan H. , Li H.

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tom 57

|

nr 4

6

Synthesis and evaluation analysis of the indicator information in nuclear safeguards applications by computing with words

100%

Liu J. , Ruan D. , Carchon R.

International Journal of Applied Mathematics and Computer Science

|

2002

|

tom 12

|

nr 3

449-462

EN

This paper aims at the handling and treatment of nuclear safeguard relevant information by using a linguistic assessment approach. This is based on a hierarchical analysis of a State's nuclear activities in a multi-layer structure of the evaluation model. After a hierarchical analysis of the State's nuclear activities on the basis of the IAEA Physical Model, the addressed objective is divided into several less complex levels. The overall evaluation can be obtained step by step from those lower levels. Special emphasis is put on the synthesis and evaluation analysis of the Physical Model indicator information. Accordingly, the aggregation process with the consideration of the different kinds of qualitative criteria is in focus. Especially, the symbolic approach is considered by the direct computation on linguistic values instead of the approximation approach using the associated membership function. In this framework, several kinds of ordinal linguistic aggregation operators are presented and analyzed. The application of these linguistic aggregation operators to the combination of the Physical Model indicator information is provided. An example is given to support and clarify the mathematical formalism.

7

Effects of water intake layout along the wharf shoreline on ships

88%

Kong X.-w. , Ding L. , Liu H.-c. , Qu J. , Li X.-s.

Polish Maritime Research

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2019

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tom nr 4

165--171

EN

The construction of a water intake along the wharf shoreline can realise the intensive and comprehensive utilisation of the shoreline. However, since the water intake will increase the lateral flow at the wharf and also the hydrodynamic forces on ships, it will bring risks to ships mooring and leaving. The effects of the water intake on ships are studied using a physical model, numerical model and standard formulas. The results show that it leads to an increase of the hydrodynamic forces acting on the ship when the standard formulas are used to calculate the forces without considering the water level difference between the two sides of the ship. The results of the physical model are closer to the real situation. Measures that can effectively reduce the influence of the water intake on ships are proposed by increasing the distance between the wharf front and the front of the water intake as well as the depth of the water inlet windows.

8

The physical model of changes setting in multilayer bearings

88%

Kowalczyk S.

Journal of KONES

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2009

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tom Vol. 16, No. 1

281-288

EN

This work presents the physical model of changes setting in multilayer bearing of combustion engines. It is known, that the slide bearing of high-load combustion engines independently from manufacturing technology, must have a material stability with regard on diffusion process of the alloy components. The present state of materials used on slide multilayer bearings of combustion engines has not changed during the last 30-year. Only small changes and modifications of material multilayer bearings, with the use of the same groups of materials, independently from specific manufacturing technology of bearing and their use were observed. The change of bearings materials. growth of operating requirements of combustion engines, ecological limitation and the price of materials may force changes in present constructional and technological conception of multilayer, in range of materials selection and huilding the bearings. This work presents the physical model of changes setting in multilaver bearing on different building. U was found that the slide bearing of high-load combustion engines is not physically and thermally stable up to l80 centigrade. Different models show that after heating, all phases and structural components present on graph of equilibrium in given temperature are not created.

9

Cross-waves and pulsating flows in the side-channel spillway - an experimental approach

88%

Azmeri A. , Ummah C. , Jemi F. Z. , Faudli I. , Nasaiy Q. A. B.

Journal of Water and Land Development

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2023

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tom no. 56

51--57

EN

Potentially hazardous side-channels of complex geometry need to be investigated using detailed hydraulic physical models. This study aims to analyse the cross-waves pattern and pulsating flow using a side-channel spillway physical model. This study compares the cross-waves pattern were measured using an experimental installation set to generate cross-waves on the surface (original series) with another structure that did not produce cross-waves (modified series). The results showed that the geometry of the left wall caused instability in flow patterns and secondary flows. The starting point of Q2 discharge was detected by minor turbulence on the water surface near the left wall at a water depth of 3.3 m at the starting point of the wall, but with no overtopping. Cross-waves formed downstream at the right wall crosswise, lower than at the left wall. The height of the cross-wave increased substantially from Q100 to Q1000 discharges leading to overtoppings near the left wall at a water depths of 4.2 and 5.0 m at the starting point of the wall, and near the right wall at a water depths of 3.8 and 4.0 m at the upstream point of the wall. The modifications provided optimal hydraulic conditions, i.e. elimination of cross-waves and non-uniform flows. The Vedernikov and Montouri numbers showed that both original and modified series did not enter the area where the pulsating flow occurred. This indicated that both series were free from the pulsating flow.

10

Optimal state feedback controller for balancing cube

88%

Kowalczyk A. , Piotrowski R.

Journal of Automation Mobile Robotics and Intelligent Systems

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2022

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tom Vol. 16, No. 3

3--12

EN

In this paper, a nonlinear balancing cube system is considered, the concept for which is based on an inverted pendulum. The main purpose of this work was the modelling and construction of a balancing cube with the synthesis of the control system. The control objectives included swing-up and stabilization of the cube on its vertex at an unstable equilibrium. Execution of the intended purpose required, first, deriving a cognitive mathematical model. It was based on the Lagrange method. Next, a mathematical model for control purposes was derived. The project of the physical model of the balancing cube was presented. A stabilization system based on a linear quadratic regulator (LQR) was developed. Moreover, a swing-up mechanism was used to bring the cube close to the upper equilibrium point. The algorithm switching condition was important to enable the correct functioning of the system. The developed control system was verified in the Matlab environment. Finally, verifying experiments and comparisons among models (mathematical and physical) were performed.

11

Dehydration of no flotation size coal's slimes on the deck of high-frequency screen with multislopes area's working surface

88%

Eremejev I. , Polulyakh A. , Polulyakh D. , Grachyov O.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2014

|

tom 14

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nr 2

12

Modelling edutainment

75%

Tofil J.

Czasopismo Techniczne. Architektura

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2015

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tom Y. 112, iss. 9-A

367--373

EN

The paper elaborates on a certain way of describing an architectural space by means of a physical model, along with a project exercise realized as a part of the course in Descriptive Geometry which is an element of the program of the first year of studies in the Faculty of Architecture. The intent is to incorporate a component of entertainment to break out of the “rigid” and “dry” way of teaching this subject.

PL

Artykuł prezentuje sposób opisu przestrzeni architektonicznej, jakim jest model fizyczny w powiązaniu z wybranym ćwiczeniem projektowym realizowanym w ramach przedmiotu Geometria wykreślna prowadzonego podczas pierwszego semestru studiów na Wydziale Architektury. Ćwiczenie to jest próbą wprowadzenia elementu zabawy strukturą dla przełamania „sztywnego” programu nauczania przedmiotu.

13

Właściwości statyczne łożyska ślizgowego z panewką pływającą

75%

Mazurkow A.

|

2003

|

tom nr 5

14-20

PL

W pracy przedstawiono model fizyczny i matematyczny łożyska ślizgowego z panewką pływającą, badania właściwości filmu smarnego przeprowadzono dla modelu adiabatycznego, stacjonarnych warunków pracy z uwzględnieniem temperatury i ciśnienia oleju zasilającego łożysko

EN

A physical and mathematical model of a slide bearing with a floating sleeve. Examination of the properties of the lubricarting film was made for an adiabatic model and stationary operating conditions including temperature and pressure of oil delivered to the bearing.

14

K matematicheskojj modeli razdelenija zernovykh smesejj po plotnosti cilindricheskimi rabochimi poverkhnostjami

75%

Bredikhin V. , Shevchenko V.

|

tom 17

|

nr 7

15

Utilisation d’un modele reduit pour l’etude precise des marees dans une mer littorale

75%

Le Provost C.

Oceanologia

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1978

|

tom 09

16

A mathematical model of the sprocket – tensioner and/or road - wheel - hub motor/generator for the intelligent main battle tank

75%

Fijałkowski B.

Journal of KONES

|

2009

|

tom Vol. 16, No. 1

125-136

EN

In the paper has been formulated a mathematical model of the sprocket-, tensioner- and/or road-wheel-hub motor/generator for the electrically-powered and mechatronically-controlled intelligent main battle tank (IMBT). In order to formulate a mathematical model of the sprocket-, tensioner- and/or road-wheel-hub AC-AC, AC-DC-AC or DC-AC/AC-DC macrocommutator magnetoelectrically-excited in-wheel-hub motor/generator, analogous to the mathematical model of the brushed DC-AC/AC-DC commutator IPM magnetoelectrically-excited motor/generator with a rotating DC-AC/AC-DC mechanoelectńcal commutator taking into consideration equations of unholonomic constraints of the AC-AC, AC-DC-AC or DC-AC/AC-DC commutator, a set of the second-order Euler-Lagrange differential equations ofdynamics in a matrix notationfor the AC commutatorless on-board generator can be written. After taking into account the equations of unholonomic constraints of the MCT or MOSFET AC-DC/DC-AC macrocommutator in the differential equations of dynamics one can be obtained differential equations of dynamics, establishing of a mathematical model of AC-DC/DC-AC macrocommutator magnetoelectrically excited in-wheel-hub generator/motor with the MCT or MOSFET application specific integrated matrixer (ASIM) AC-DC/DC-AC macrocommutator, acting as the electrical machine's MCT or MOSFET ASIM AC-DC rectifier/DC-AC inverter.

17

Experimental study of the effect of rock blasting with various cutting forms for tunnel excavation using physical model tests

75%

An H. , Song Y. , Yang D. , An H. , Song Y. , Yang D.

|

18

Działanie mechanizmów broni automatycznej z odprowadzeniem gazów po zatrzymaniu tłoka gazowego

75%

Pac M. , Torecki S.

Problemy Techniki Uzbrojenia

|

2011

|

tom R. 40, z. 120

85--92

PL

W referacie przedstawiono model fizyczny i matematyczny działania mechanizmów broni automatycznej z odprowadzeniem gazów prochowych po zatrzymaniu tłoka gazowego. W modelu uwzględniono okresy charakterystyczne wynikające z wykresu cyklicznego działania automatyki rozpatrywanego układu. Powyższe modele zostały uzupełnione przykładem obliczeń dla parametrów geometrycznych demonstratorów technologii karabinków standardowych Modułowego Systemu Broni Strzeleckiej kalibru 5,56 mm (MSBS-5,56).

EN

Physical and mathematical models of gas operated weapon after gas piston detaining are presented in this paper. The phenomenon was divided into eight specific periods regarding cycle of operation. Moreover some simulations results complemented by examples of calculations for geometric parameters of the Module-based Firearm System (MSBS-5,56) assault rifle technology demonstrators are included.

19

Study of multi-layer flow in coextrusion processes

75%

Levanichev V.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

|

2014

|

tom 14

|

nr 1

20

Labyrinth screw pump theory

75%

Andrenko P. , Lebedev A.

|

nr 6