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Wyświetlanie 1-15 z 178
Tytuł:
A Hydrophysical Analysis of Urban Surface Runoff, Channel Characteristics, and the Incidence of Flood and Erosion Over the Calabar Drainage Area, Nigeria
Autorzy:
Ugbong, I. A.
Budagov, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/952348.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
drainage
channels
runoff volume
flood and erosion
gradient
drainage area
channel length
Opis:
Hydro-physical processes operating in the Calabar drainage area were analyzed by estimating the volume of surface runoff carried in each basin and sub-basin, using field measurements of flow velocities in conjunction with the “Rational Method” mathematical model proposed by civil and environmental engineers. It was found that run-off flow is affected by at least three factors which either produce floods or erosion conditions. The factors include size of catchment areas, gradient and lengths of flow channels. The Multiple Regression statistic was used to test these relationships. The results showed a strong statistical correlation among these variables, as well as between these variables and flow characteristics. It was found that for all the basins, runoff volume increased with increasing surface area of the catchment; just as areas with lower elevations register higher flow volume accompanied by flooding; with a reversed condition in higher ground where higher velocities are found with resultant erosion conditions. Also channels with considerable lengths receive higher flows along their courses downstream, and thus produce floods. It was therefore, recommended that in addition to the six major drainage channels recommended for the area, each channel and each segment of a channel should be determined by its gradient, drainage area, length of flow channel.
Źródło:
Journal of Ecological Engineering; 2016, 17, 3; 30-40
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Miocene anastomosing river system in the area of Konin Lignite Mine, central Poland
Autorzy:
Widera, M.
Kowalska, E.
Fortuna, M.
Powiązania:
https://bibliotekanauki.pl/articles/191379.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
sedimentology
fluvial deposits
palaeochannel pattern
anastomosing river
sand-filled channels
Opis:
This sedimentological study of the Wielkopolska Member of the Miocene Poznań Formation in the Jóźwin IIB opencast lignite-mining field, central Poland, reveals a late mid-Miocene anastomosing fluvial system with ribbon-shaped channels filled mainly by sandy and muddy deposits. The fluvial system, extending across the eastern flank of the post-Mesozoic Kleczew Graben, was tributive in its eastern upper reaches, but was increasingly distributive and northwards deflected in its lower reaches near the graben axis. Lithofacies analysis of a representative palaeochannel indicates that the river discharge significantly fluctuated and that the channels were filled with mud-bearing stratified fine-grained sand by low-density tractional turbulent flow during the high and low water stages and with a massive mud or sandy mud by a high-density flow during the rising and falling stages. The spatial pattern of fluvial channels and deformation channel-fill sandbodies were controlled by the graben topography and the differential compaction of peat substrate, with possible influence of bedrock faults. The fluvial system is thought to have drained to an endorheic ‘terminal’ basin to the north, rather than into the hypothetical Baltic River and further westwards to the distant North Sea basin, as postulated by some previous authors. The present case study contributes to the known spectrum of anastomosing river systems as a sand- to mud-dominated end-member.
Źródło:
Annales Societatis Geologorum Poloniae; 2017, 87, 2; 157-168
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air heating at its movement along channels in systems with the individual air submission in premises
Ogrzewanie powietrza przepływającego w kanałach w systemach z indywidualnym dostarczaniem powietrza do pomieszczenia
Autorzy:
Piotrowski, J. Z.
Stroj, A. F.
Powiązania:
https://bibliotekanauki.pl/articles/402384.pdf
Data publikacji:
2011
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
systemy z przepływającym powietrzem
ogrzewanie strumienia powietrza w kanałach
przyrost ciepła w kanałach
in flowing air systems
heating of air stream in channels
gain of heat in channels
Opis:
Derived is the equation to calculate the heating of an air stream along the channels. It can he used to more accurately calculate the heating of an air stream. An example illustrates the use of the derived formula.
Źródło:
Structure and Environment; 2011, 3, 2; 35-39
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Efficient Chaotic Interleaver for Image Transmission over IEEE 802.15.4 Zigbee Network
Autorzy:
El-Bendary, M. A. M. M.
El-Azm, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/309078.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
block interleaving
chaotic interleaving
convolutional interleaving
fading channels
ZigBee
Opis:
This paper studies a vital issue in wireless communications, which is the transmission of images over wireless networks. IEEE ZigBee 802.15.4 is a short-range communication standard that could be used for small distance multimedia transmissions. In fact, the ZigBee network is a wireless personal area network (WPAN), which needs a strong interleaving mechanism for protection against error bursts. Thispaper presents a novel chaotic interleaving scheme for this purpose. This scheme depends on the chaotic Baker map. A comparison study between the proposed chaotic interleaving scheme and the traditional block and convolutional interleaving schemes for image transmission over a correlated fading channel is presented. The simulation results show the superiority of the proposed chaotic interleaving scheme over the traditional schemes.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 2; 67-73
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANALGESIC AND ANTI-INFLAMMATORY ACTIVITY OF NEW ANALOGUES OF HC-030031: A TRPA1 CHANNEL ANTAGONIST
Autorzy:
Bryła, Adrian
Ślusarczyk, Marietta
Zygmunt, Małgorzata
Chłoń-Rzepa, Grażyna
Kazek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895336.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
inflammation
pain
TRPA1 channels
HC-030031 analogues
Opis:
One of our study direction is research in the group of compounds affecting the TRPA1 ion channel which can perform an important function in pain (including neuropathic pain) and inflammation for example in asthma and other chronic respiratory diseases. The aim of this study was to evaluate the analgesic and anti-inflammatory activity of two analogues of HC-030031 analogues belonging to nitrogen derivatives of heterocyclic system: xanthine (cmpd 1) and benzimidazole (cmpd 2) with hydrazide and amide moieties respectively In this paper, for two derivatives (cmpd 1 and cmpd 2) potential analgesic and anti-inflammatory/anti-edematous activities were evaluated in animal models of pain in mice (writhing response test, formalin test) and inflammation in rats (carrageenan-induced paw edema test). Both the tested compounds 1 and 2 showed a significant analgesic and anti-inflammatory activity.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 113-119
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza procesów logistycznych dystrybucji produktów elektroinstalacyjnych – obsługa klienta
Analysis of performance appraisal system of employees in small and medium enterprises
Autorzy:
Grabowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/946015.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
obsługa klienta
dystrybucja
kanały dystrybucji
mapa procesu
analiza wskaźnikowa
customer service
distribution
distribution channels
process map
index analysis
Opis:
Do podstawowych procesów dystrybucji fizycznej zaliczane są obsługa klienta, magazynowanie i utrzymywanie zapasów oraz transport produktów. Celem niniejszego opracowania jest analiza procesu obsługi klienta przedsiębiorstwa z branży elektroinstalacyjnej. Do analizy tego procesu wykorzystano mapę procesu oraz analizę wskaźnikową. W opracowaniu scharakteryzowano kanały dystrybucji produktów oraz dokonano oceny istniejących kanałów dystrybucji. Zamiarem dalszych badań będzie analiza gospodarki magazynowej oraz transportu w tym samym podmiocie badań.
The basic processes of physical distribution include customer service, storage and maintenance of inventory and product transport. The aim of this study is to analyze the customer service process of a company from the electrical installation industry. The process map and the index analysis were used to analyze this process. The study characterized product distribution channels and assessed existing distribution channels The next stage of research will be the analysis of warehouse management and transport.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 121; 137-150
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyses of Code Division Multiple Access (CDMA) Schemes for Global Mobile Satellite Communications (GMSC)
Autorzy:
Ilcev, D. S.
Powiązania:
https://bibliotekanauki.pl/articles/1841573.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Mobile Satellite Communications
Code Division Multiple Access
Multiple Access Technique
Satellite Communication Systems
Mobile Earth Station
orthogonal channels of transmission
GMSC Networks
very small aperture terminals
Opis:
This paper describes in particular Code Division Multiple Access (CDMA) applicable in Global Mobile Satellite Communications (GMSC). In satellite communication systems, as a rule, especially in GMSC networks many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users, however, can be solved by using Multiple Access Technique (MAT) system. Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MAT to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 4; 805-810
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibilities of using composite structural c-channels as lining for an arch support in mining excavation
Autorzy:
Rotkegel, Marek
Korol, Jerzy
Sobczak, Dagmara
Powiązania:
https://bibliotekanauki.pl/articles/2073872.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wyrobisko chodnikowe
profil konstrukcyjny
bezpieczeństwo górnicze
górnicza obudowa powłokowa
research
lining
arch support
composite c-channels
Opis:
The article is the result of a project aimed at developing and implementing a design of composite accessories for support in excavations located in underground hard coal mines. The research team verified the possibility of using elements made of prefabricated composite structural profile as an alternative to steel and reinforced concrete lining elements used to improve support’s stability and protect against rockfall. This paper includes a research experiment on the possibilities of using a composite C-profile element as lining made in the pultrusion technology with a longitudinal position of the roving. The prefabricated structural profiles were adapted to the function by designing seatings for fitting the flanges for arch support’s V-profiles. Prototypes of these elements were subjected to bench tests in compliance with the guidelines for testing mesh linings. In addition, computer simulations using the finite element method were carried out. The values obtained during the tests were compared with the requirements for lightweight mesh and included the Polish standard PN-G-15050 and reinforced A-type concrete lining defined in the standard PN-G-06021. The team determined the areas where material strength exceeded and the structure was damaged. Despite the limited quantity of laboratory tests and lack of field tests in actual mining conditions, it was possible to address the argument of the research and determine whether it is possible to use C-profile made in the pultrusion technology as a lining element.
Źródło:
Archives of Mining Sciences; 2021, 66, 3; 437--455
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying simulation studies to define further development of the Przemyslowy Canal in Szczecin
Autorzy:
Gucma, L.
Boć, R.
Bąk, A.
Powiązania:
https://bibliotekanauki.pl/articles/116081.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
port manoeuvering
Port of Szczecin
Przemyslowy Canal in Szczecin
applying simulation study
navigation safety
safety of navigation
parameters of waterways
harbour approach channels design
Opis:
The increasing sizes of ships and lack of functionality of the existing solutions determine the interest in rebuilding the already existing solutions. Simulation models allow to analyse the possible modernisation variants taking into account the variability of elementary parameters. The article presents analysis results for the Przemyslowy Canal in Szczecin with respect to navigation safety and regulating traffic regulations in the Przemyslowy Canal taking into consideration the interests of all subjects involved. The paper applies real-time simulation methods based on manoeuvring simulators. After a thorough analysis that took into account the safety of navigation, further possibilities of development have been determined. Study results are aimed at designing new solutions in case of modernization of the Przemyslowy Canal in Szczecin.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 547-552
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bieżąca diagnostyka torów pomiarowych oraz nieszczelności sieci gazowej
On-line diagnostics of gas network measurement channels and leak detection
Autorzy:
Syfert, M.
Stachura, M.
Powiązania:
https://bibliotekanauki.pl/articles/257519.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
bieżąca detekcja uszkodzeń
walidacja torów pomiarowych
system diagnostyczny
on-line fault detection
validation of channels
diagnostic system
Opis:
W artykule przedstawiono pilotażowe wdrożenie systemu bieżącej diagnostyki torów pomiarowych oraz detekcji nieszczelności wykonane dla testowego odcinka sieci gazowej. Aplikacja zrealizowana została z wykorzystaniem modułów systemu zaawansowanego monitorowania i diagnostyki AMandD. Na początku przedstawiono krótki opis procesu oraz zrealizowany symulator sieci gazowej wraz z opisem możliwości jego zastosowania w opisywanym systemie. Następnie opisano strukturę systemu oraz podano szczegóły realizacji algorytmów detekcji i lokalizacji uszkodzeń. Na zakończenie zaprezentowano wyniki pierwszych testów systemu oraz podsumowano jakość działania systemu oraz możliwy zakres zastosowania.
The article presents a pilot implementation of an on-line diagnostic system of the measurement channels and leak detection, performed for a gas network test segment. The application was implemented using modules of Advanced Monitoring and Diagnostics System AMandD. A brief description of the process and the gas network simulator is presented at the beginning of the article. Next, a description of the possibilities of its use in the described system is characterised. The structure of the system and some details of the detection and location of a damage algorithms implementation are included. In conclusion, results of first tests of the system are presented. At last, authors summarise the system quality and propose the possible scope of application.
Źródło:
Problemy Eksploatacji; 2011, 2; 161-180
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blind Estimation of Linear and Nonlinear Sparse Channels
Autorzy:
Georgoulakis, K.
Powiązania:
https://bibliotekanauki.pl/articles/307846.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
blind estimation and equalization
clustering techniques
sparse zero pad channels
Opis:
This paper presents a Clustering Based Blind Channel Estimator for a special case of sparse channels - the zero pad channels. The proposed algorithm uses an unsupervised clustering technique for the estimation of data clusters. Clusters labelling is performed by a Hidden Markov Model of the observation sequence appropriately modified to exploit channel sparsity. The algorithm achieves a substantial complexity reduction compared to the fully evaluated technique. The proposed algorithm is used in conjunction with a Parallel Trellis Viterbi Algorithm for data detection and simulation results show that the overall scheme exhibits the reduced complexity benefits without performance reduction.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 1; 65-71
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundary problem for equations of steady gradually varied flow in open channels
Autorzy:
Szymkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/241107.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
differential equations
steady flow
gradually varied flow
open channels
Opis:
In this paper the problem of solution of ordinary differential equations describing a steady, gradually varied flow is discussed. It is shown that, apart from the initial problem usually solved for open channels, the formulation of the boundary problem is necessary when water levels are imposed at ends of channel. This approach is the mathematically correct formulation of the solution problem for steady, gradually varied flow equations. It enables us to determine directly the water profile and discharge for a single channel, as well as for channel network, instead of the trial and error method usually used. Moreover the formulation of boundary problem with respect to the Manning coefficient and lateral inflow is presented. To solve the listed problems the finite differences method is used.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 4; 23-37
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business communication in Poland: sale promotion, advertising, public relations and virtual communication
Autorzy:
Lewicka, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/1195225.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Polska
communication
business
channels
advertising
public relations
customers
social media
Opis:
Business communication is a key activity for every business, as every business has to deal with its external and internal environment. It describes many business activities and can be taken under consideration from different perspectives, but still the basic communication activities can consider any company in the world. However, the cultural aspect determines the realization of every activity. In different countries the way a business communicates with customers, or business actors do it within the company, differs respectively to national traditions, values and beliefs. The aim of the following article is to present, analyse and explain the way of business communication in Poland. As every country, it has a specific characteristics that is distinctive only for its own, which deeply affects various aspects of business communication. The typical and mainstream ways of realizing the activities in the country will be presented including advertising practice and media regulations which also affect this area of communication. The article will focus on the external communication in Poland, taking under consideration four areas: sale promotion, advertising, public relations and virtual communication. The analysis will start from short elaboration of what the essence of business communication is and the current country characteristics in terms of economy. The article will form a useful material for foreign studies purposes and may also be helpful in further comparisons with other countries.
Źródło:
Społeczeństwo i Ekonomia; 2015, 2(4); 67-84
2353-8937
Pojawia się w:
Społeczeństwo i Ekonomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation method for flow boiling and flow condensation of R134a and R1234yf in conventional and small diameter channels
Autorzy:
Mikielewicz, D.
Jakubowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/259535.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
heat transfer coefficient
flow boiling
conventional channels
minichannels
Opis:
The paper presents the results of calculations performed using the authors’ model to predict the heat transfer coefficient during flow boiling for two refrigerants R134a and R1234yf. The experimental data from various past studies have been collected and the calculations have been conducted for the full range of quality variation and a wide range of mass velocity. The aim of the study was to test the sensitivity of the in-house flow boiling and flow condensation model. The importance of taking into account the surface tension as the parameter exhibiting its importance in case of the flow in minichannels, as well as the influence of the reduced pressure were analysed. The obtained numerical results show good consistency with those recorded in the experiments.
Źródło:
Polish Maritime Research; 2017, S 1; 141-148
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of the indoor radio propagation channel at 2.4 GHz
Autorzy:
Wysocki, T. A.
Zepernick, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/309221.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
indoor radiocommunication
microwave propagation
fading channels
jamming
Opis:
The unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz has gained increased attention recently due to the high data rate communication systems developed to operate in this band. The paper presents measurement results of fading characteristics, multipath parameters and background interference for these frequencies. Some statistical analysis of the measured data is presented. The paper provides information that may be useful in design and deployment of communication systems operating in the 2.4 GHz ISM band, like those compilant with IEEE 802.11 standard and Bluetooth open wireless standard.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 84-90
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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