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    Wyświetlanie 1-7 z 7
    Tytuł:
    Internetization of selling hotel rooms in metropolitan area of Łódź (Poland)
    Autorzy:
    Napierała, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1201875.pdf
    Data publikacji:
    2017-08-30
    Wydawca:
    Uniwersytet Gdański. Instytut Geografii
    Tematy:
    internetization
    direct distribution channel
    hotel
    metropolitan area of Łódź
    Opis:
    The aim of the paper is to discuss spatial aspects of internetization of selling hotel rooms in metropolitan area of Łódź in Central Poland. However, only direct distribution channels were considered. Investigated hotels were divided into three groups referring to their ability to use Internet in direct selling activities. First group was established by the hotels most advanced in using Internet. Being advanced was understood as selling hotel rooms by online reservation systems. Hotels used to promote their services by their own website belonged to the second investigated group. It must be noted that mentioned enterprises presented full offer on their own websites, including detailed price information. However, they forced the clients to use phone, fax or email to complete the reservation process. Finally, the third studied group was established by the hotels without any experience with using Internet as a direct selling tool. Significance of three mentioned hotel groups was investigated both in spatial (metropolitan area of Łódź) and in time context (2009–2015 period).
    Źródło:
    Journal of Geography, Politics and Society; 2017, 7, 3; 19-30
    2084-0497
    2451-2249
    Pojawia się w:
    Journal of Geography, Politics and Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The efficiency of food supply chain engineering (case study in Ukraine)
    Autorzy:
    Kush, Yevhen
    Tonkoshkur, Maksym
    Vakulenko, Kateryna
    Ryabev, Anton
    Davidich, Natalia
    Galkin, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/1833669.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    material flow
    direct channel
    supply chain
    food supply engineering
    present value
    efficiency
    przepływ materiałów
    kanał bezpośredni
    łańcuch dostaw
    inżynieria dostaw żywności
    wartość
    wydajność
    Opis:
    The basic conceptual idea of logistics is the need to adapt the company to an ever-changing market situation, while spending a minimum of funds in these conditions. The concept of logistics is a system of views on the rationalization of economic activity by optimizing material flows. The paper investigates the change of the main indicators of the functioning of the supply chain, depending on the organization of distribution of the material flow. The supply systems of food products that form the consumer basket at the stage of distribution is considered. The conceptual schemes of freight flow distribution with and without distribution center is presented. The field research was conducted to determine and initial data were collected. The paper investigate the functioning of the supply chain in two cases: in a situation "proposed scenario" and in a situation "without a project". The situation "existing scenario" implies that no action to change the parameters of the supply chain during the period specified for the research does not take place. In this case, it is necessary to assess the effectiveness of the logistics chain under existing conditions. An integrated approach to evaluate the efficiency of the functioning of the logistics system and the consumer had been used. The efficiency of existing of the supply chain functioning were analysed. Also, certain measures will be implemented to improve the chain through investments and by bringing logistics infrastructure with the needs. A modelling of the supply chain was made. The effect of parameters of participants on the supply chain efficiency was analysed. The planned effect from the reorganization of distribution channels is calculated. The technological and economic feasibility of introducing a distribution center into the existing distribution channel based on modeling is calculated. The object of the research is the process of food products distribution in the supply chain. The aim of the research is to evaluate the effectiveness of the food supply chain scheme.
    Źródło:
    Archives of Transport; 2020, 55, 3; 51-71
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM simulation of combined extrusion method (ECAE/Direct Extrusion)
    Autorzy:
    Ayer, Ö
    Powiązania:
    https://bibliotekanauki.pl/articles/118033.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    FEM
    Equal Channel Angular Extrusion
    Direct Extrusion
    DEFORM 3D
    Opis:
    Equal Channel Angular Extrusion (ECAE) is known as a severe plastic deformation process and material is deformed without any geometrical change. It is widely used for obtaining high mechanical properties from the product. Direct Extrusion is another plastic deformation process in which a workpiece is reduced in cross-section by forcing it through the die opening of a small cross-sectional area than that of the original billet. In this study, these two processes are combined together via using DEFORM 3D which is a very specialized software for metal forming operations. Lead is used as workpiece material to simulate hot forming conditions and also process parameters (die angle and die land length) were investigated. The forming load and strain components were calculated from the FEM results obtained from DEFORM 3D software.
    Źródło:
    Applied Computer Science; 2015, 11, 2; 50-59
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bezpośrednia sprzedaż jako istotny kanał zbytu produktów rolnictwa ekologicznego w województwie podkarpackim
    Direct sale as essential distribution channel of ecological products in Podkarpacie province
    Autorzy:
    Dziedzic, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/335959.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    rolnictwo ekologiczne
    sprzedaż bezpośrednia
    kanał zbytu
    żywność ekologiczna
    ecological agriculture
    direct sale
    channel distribution
    ecological food
    Opis:
    W pracy zaprezentowano trendy rozwoju kanałów dystrybucji żywności ekologicznej, ze szczególnym zwróceniem uwagi na rozwój bezpośredniej sprzedaży produktów ekologicznych. Przedstawiono również wyniki badań własnych, realizowanych w woj. podkarpackim, które pozwoliły wyłonić grupę 100 ekologicznych producentów rolnych zajmujących się sprzedażą bezpośrednią. Stali się oni przedmiotem pogłębionej analizy, której niektóre wyniki zaprezentowano w publikacji.
    The trends of development of ecological food channels distribution in this work were presented, with special attention paid to development of direct sale of ecological products. On the ground of the results of own investigations realized in Podkarpacie province the group of 100 ecological agricultural producers dealing with direct sale was appointed. They became the object of the deepened analysis some results of which are presented in this publication.
    Źródło:
    Journal of Research and Applications in Agricultural Engineering; 2006, 51, 2; 22-29
    1642-686X
    2719-423X
    Pojawia się w:
    Journal of Research and Applications in Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of carbon dioxideand product water exhausts in a directmethanol fuel cell with serpentine channels
    Autorzy:
    Nakashima, Kohei
    Powiązania:
    https://bibliotekanauki.pl/articles/246103.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    direct methanol fuel cell
    bubble
    carbon dioxide
    slug of carbon dioxide
    product water
    transparent cell
    serpentine channel
    Opis:
    This study utilized a transparent direct methanol fuel cell, with serpentine channels with a width of 2 mm and an initial depth of 2 mm, and investigated the relationship between the behaviours of carbon dioxide (CO2) slugs, product water accumulations, and voltage fluctuation. It examined the exhaust volumes of CO2 slugs and product water accumulations from the channels over time, comparing an anode channel with a depth of 1.2 mm to one with a depth of 2 mm (without changing the cathode depth of 2 mm, nor the width of 2 mm in both the anode and the cathode). Results indicated that cell voltage fluctuated, rising while CO2 slugs were ejected, and falling between ejections. In the case of an anode channel depth of 2 mm and a lower methanol-water solution flow rate, CO2 slugs were ejected less frequently, so cell voltage fluctuated widely. (Product water accumulations in the cathode had a minimum effect on this cell voltage fluctuation.) In the case of a higher methanol-water solution flow rate, CO2 slugs were ejected more frequently, with less exhaust volume per CO2 slug, reducing the fluctuation in cell voltage. Finally, with an anode channel depth of 1.2 mm, the exhaust volume per CO2 slug became even smaller, and these small CO2 slugs were rapidly ejected. With this shallow depth, the cell voltage increased with a lower methanol-water solution flow rate, but decreased with a higher methanol-water solution flow rate by crossover.
    Źródło:
    Journal of KONES; 2019, 26, 3; 137-144
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of the Direct Sequence Spread Spectrum Underwater Acoustic Communication System with Differential Detection in Strong Multipath Propagation Conditions
    Autorzy:
    Schmidt, Jan H.
    Kochańska, Iwona
    Schmidt, Aleksander M.
    Powiązania:
    https://bibliotekanauki.pl/articles/31339747.pdf
    Data publikacji:
    2024
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    direct sequence spread spectrum
    DSSS
    m-sequences
    Kasami codes
    shallow-water channel
    multipath propagation
    underwater acoustic communications
    UAC
    Opis:
    The underwater acoustic communication (UAC) operating in very shallow-water should ensure reliable transmission in conditions of strong multipath propagation, significantly disturbing the received signal. One of the techniques to achieve this goal is the direct sequence spread spectrum (DSSS) technique, which consists in binary phase shift keying (BPSK) according to a pseudo-random spreading sequence. This paper describes the DSSS data transmission tests in the simulation and experimental environment, using different types of pseudo-noise sequences: m-sequences and Kasami codes of the order 6 and 8. The transmitted signals are of different bandwidth and the detection at the receiver side was performed using two detection methods: non-differential and differential. The performed experiments allowed to draw important conclusions for the designing of a physical layer of the shallow-water UAC system. Both, m-sequences and Kasami codes allow to achieve a similar bit error rate, which at best was less than 10−3. At the same time, the 6th order sequences are not long enough to achieve an acceptable BER under strong multipath conditions. In the case of transmission of wideband signals the differential detection algorithm allows to achieve a significantly better BER (less than 10−2) than nondifferential one (BER not less than 10−1). In the case of narrowband signals the simulation tests have shown that the non-differential algorithm gives a better BER, but experimental tests under conditions of strong multipath propagation did not confirm it. The differential algorithm allowed to achieve a BER less than 10−2 in experimental tests, while the second algorithm allowed to obtain, at best, a BER less than 10−1. In addition, two indicators have been proposed for a rough assessment which of the detection algorithms under current propagation conditions in the channel will allow to obtain a better BER.
    Źródło:
    Archives of Acoustics; 2024, 49, 1; 129-140
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Subsynchronous oscillation and its mitigation of VSC-MTDC with doubly-fed induction generator-based wind farm integration
    Autorzy:
    Su, Miaohong
    Dong, Maiying
    Liu, Kaiqi
    Zou, Weiwei
    Powiązania:
    https://bibliotekanauki.pl/articles/1841370.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    doubly-fed induction generator
    eigenvalue analysis
    multi-channel variable-parameter subsynchronous damping controller
    subsynchronous oscillation voltage source converter
    multi-terminal direct current transmission system
    Opis:
    Wind power integration through the voltage source converter-based high-voltage direct current (VSC-HVDC) system will be a potential solution for delivering large-scalewind power to the “Three-North Regions” of China. However, the interaction between the doubly-fed induction generator (DFIG) and VSC-HVDC system may cause the risk of subsynchronous oscillation (SSO). This paper establishes a small-signal model of the VSC based multi-terminal direct current (VSC-MTDC) system with new energy access for the problem, and the influencing factors causing SSO are analyzed based on the eigen valueanalysis method. The theoretical analysis results show that the SSO in the system is related to the wind farm operating conditions, the rotor-side controller (RSC) of the DFIG and the interaction of the controller in the VSC-MTDC system. Then, the phase lag characteristicis obtained based on the signal test method, and a multi-channel variable-parameter subsynchronous damping controller (SSDC) is designed via selecting reasonable parameters.Finally, the correctness of the theoretical analysis and the effectiveness of the multi-channelvariable-parameter SSDC are verified based on time-domain simulation.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 53-72
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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