Autor: Bogdan, L., - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Computer Dynamic Modelling of Communal Sewage Networks
Autorzy:: Bogdan, L.,
Petriczek, G.
Studziński, J.
Tematy:: command sewage network
flow computer modelling
Manning formula; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384831.pdf Link otwiera się w nowym oknie
Opis:: In the paper two algorithms of dynamic modeling of communal sewage networks are presented. It is assumed that the hydraulic parameters of segments, namely canal shape, canal dimension and roughness are constant. The goal of the algorithms is to calculate the main sewage network parameters using only the continuity equation and the Manning formula. In the algorithms, fundamental algebraic formulas describing the filling heights in the canals and the sewage flow velocities are also used. The network model based only on the Manning formula and continuity equation in difference form and not on the liquid equations as it is used commonly by modelling the sewage networks is simpler and faster in calculations. While modeling the networks fixed network structure and slowly changing sewage inflows into the canals are assumed. The forecasted inflow values are stated and the investigation presented concerns the sanitary and mixed gravitational sewage networks.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Mathematical modeling and computer aided planning of communal sewage networks
Autorzy:: Bogdan, L.
Petriczek, G.
Studziński, J.
Tematy:: mathematical modeling of sewage network
hydraulic parameter of canal; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384901.pdf Link otwiera się w nowym oknie
Opis:: In the paper the basic questions connected with modeling of wastewater networks are presented. Methods of modeling basic sewage parameters and appropriate calculation algorithms are described. The problem concerns the gravitational networks divided by nodes into branches and sectors. The nodes are the points of connection of several network segments or branches or the points of changing network parameters as well as of location of sewage inflows to the network. The presented algorithms for networks hydraulic calculation concern sanitary or combined sewage nets. It is assumed that the segments parameters such as shape, canal dimension, bottom slope or roughness are constant. Because of these assumptions all relations considered concern the steady state conditions for the network. The calculation of flow velocities and the filling heights in the segments of the wastewater net are carried out for the known slopes and diameters of the canals.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Modelling the steady state of sewage networks as a support tool for their planning and analysis
Autorzy:: Petriczek, G.
Studziński, J.
Bogdan, L.
Tematy:: hydraulic formulas for describing sewage networks
mathematical modeling
optimization and design of sewage networks; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/406617.pdf Link otwiera się w nowym oknie
Opis:: Fundamental questions connected with the modelling of communal sewage networks have been considered and formulas used to model the functioning of the basic network have been analyzed. The problem described concerns gravitational sewage networks divided by nodes into branches and sectors. Simulation of the steady state functioning of sewage networks is commonly carried out on the basis of nomograms in the form of charts, in which the relations between network parameters like channel diameters, flow rates, hydraulic slopes and flow velocities are described. In traditional design, the values of such parameters are simply read from such nomogram chart tables. Another way of simulating the functioning of a network is the use of professional software, like SWMM, that models sewage flows along the channels by means of differential equations describing the movement of fluids. In both approaches, the user is a mechanical operator of a “black box” procedure. In this paper, another way of simulating the functioning of sewage net-works has been presented. Numerical solutions of nonlinear equations describing the physical phenomena of sewage flows are applied and explained. The presented algorithms were developed to model the steady state of a sewage network enabling a quick analysis of the network parameters and the possibility of fast, simple and comprehensible network modeling and design.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Disinformation as a threat to national security on the example of the COVID-19 pandemic
Autorzy:: Sługocki, Wojciech Ł.
Sowa, Bogdan
Tematy:: national security
disinformation
COVID-19; Pokaż więcej
Wydawca:: Akademia Sztuki Wojennej
Powiązania:: https://bibliotekanauki.pl/articles/1311314.pdf Link otwiera się w nowym oknie
Opis:: Nowadays, the vast majority of the threats to our security is related to information security, resulting in a significant transformation of national security systems. One such threat is disinformation, which is increasingly being used intentionally. The study examines certain impacts of disinformation on national security as a system, on the example of the COVID-19 pandemic. Therefore, the study explores some processes visible at the international level and reviews some external problems in connection with national security. Research methods and techniques implemented in the research process itself are primarily based on a critical analysis of the literature and the analysis and synthesis of published research results. The main findings show that the phenomenon of disinformation, which intensifies in crisis situations (e.g. related to the outbreak of a pandemic) contributes to the destabilization of public mood, hinders the functioning of the basic organs of the state and, consequently, increases the negative effects of crisis events. Secondly, the disinformation used during the COVID-19 pandemic has exacerbated its effects, causing damage on an unprecedented scale. The analyses show that the fight against disinformation must be based on the assumption that the security of the state depends primarily on the information awareness of each citizen. Social awareness is built through effective education aimed at raising basic medical knowledge. Disinformation has serious consequences for modern countries as it creates a new threat to their national security in peacetime.
Dostawca treści:: Biblioteka Nauki