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Wyświetlanie 1-15 z 111
Tytuł:
Performance of Distribution Channels Shown on the Example of Company Specialising in Meat Processing
Autorzy:
Rorat, Joanna Maria
Powiązania:
https://bibliotekanauki.pl/articles/504080.pdf
Data publikacji:
2016
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
distribution channels
effectiveness of distribution channels meat processing
minimization distribution costs
Opis:
As far as the rapid development of global marketing network is concerned , it is easy to notice that logistics is becoming increasingly important. The growing competition makes these networks more efficient. More and more opportunities to bring products to the customer disorganize sales network management. The analysis of the effectiveness of distribution channels allows a close examination of efficiency of how the company reaches its customers. It also supports decisions regarding the introduction of new, previously unused channels of distribution, or modification of the already in-use ones. The range of work included a manufacturer specializing in meat processing and production of meat products, distributed in southern Poland. Using the point-analytical method, the effectiveness of distribution channels used in the company was evaluated. As a result, it was possible to determine the performance of individual sales channels. There were three distribution channels: by-company, sponsored and networking. The most effective appeared to be the networking channel, which scored a total of 235 points. Given the greatest potential of distribution, this channel, in terms of the size of the batch supplied to markets, without doubt will continue to be one of the leading directions of development in the future of the company. In second place was the by-company channel with 195 points, while the sponsored channel was the least effective. However, as a conclusion from the information gathered from the company itself, each channel will be developed in the future, proportionally to their current rank.
Źródło:
Logistics and Transport; 2016, 29, 1; 19-24
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the phenomena accompanying the condensation of environmentally friendly refrigerants in mini-channels
Autorzy:
Kuczyński, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/2204074.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
refrigerants
condensation
mini-channels
Opis:
This paper presents the results of an experimental study and mathematical modeling of the effect of dynamic instabilities on the condensation phase transformation of the refrigerants homogeneous R134a and its replacement in the form of isomers R1234yf and R1234ze and R404A or R507 and R448A in pipe mini-channels. In the case of homogeneous chlorofluorocarbons (CFCs), it is the 1234 isomers that are envisioned as substitutes for the withdrawn ones with high ozone depletion potential and global warming potential. For zeotropic and azeotropic mixtures, for example, these are R507 or R448A. The paper presents a dimensional analysis procedure based on the Buckingham Π theorem to develop a regression velocity model of pressure dynamic instabilities. The experimental part of the work was carried out with the use of tubular mini-channels with internal diameter 1.40–3.3 mm.
Źródło:
Archives of Thermodynamics; 2023, 44, 1; 121--137
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Error statistics for concatenated systems on non-renewal time-varying channels
Autorzy:
Pimentel, C.
Powiązania:
https://bibliotekanauki.pl/articles/309548.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
finite state channels
multigap distribution
constrained codes
concatenated systems
Gilbert-Elliott channels
combinatorial methods
Opis:
The statistics of the error process generated by a discrete super channel formed by the concatenation of a constrained encoder, a non-renewal finite state channel (FSC), and a constrained decoder is studied in this paper. First, recursions are developed for the error weight distribution. This statistics is relevant to the design of coding schemes and interleaving in concatenated. systems. We also study the renewal nature of the residual error process as modified by the constrained decoder. Ferreira et al. conjectured that if the channel model is a renewal FSC, the super channel can be modeled as a similar renewal model. We use a statistics called the multigap distribution to analytically disprove this hypothesis. Furthermore, the effect of interleaving is investigated from a new perspective using the variance of the multigap distribution.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 3; 55-60
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of 3D turbulence structure in a compound channel
Autorzy:
Czernuszenko, W.
Kozioł, A.
Rowiński, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/241134.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open channels
compound channel
turbulence
measurements
Opis:
The paper describes some turbulence measurements carried out in an experimental compound channel with flood plains. The surface of the main channel bed was smooth and made of concrete, whereas the floodplains and sloping banks were covered by cement mortar composed with terrazzo. Instantaneous velocities were measured be means of a three-component acoustic Doppler velocity meter (ADV) manufactured by Sontek Inc. This article presents the results of measurements of primary velocity, the distribution of turbulent intensities, Reynolds stresses, autocorrelation functions, turbulent scales, as well as the energy spectra.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 1; 55-73
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of fossils on diagenetically controlled reservoir quality : the Zechstein Brońsko Reef
Autorzy:
Fheed, Adam
Powiązania:
https://bibliotekanauki.pl/articles/191256.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
carbonates
dissolution channels
diagenesis
fossils
porosity
Opis:
Although the sedimentation and diagenesis of the Polish Zechstein Limestone strata (Ca1, Permian) already have been investigated, relatively little has been done to resolve their petrophysical potential. Therefore, the gap between sedimentological and petrophysical studies was bridged through an integrated analysis of geological and geophysical data. The results of core description, polarized-light microscopy, well log interpretations and laboratory measurements on core samples were combined with previously published nuclear magnetic resonance (NMR) and X-ray microtomography (μCT) data, especially helpful in the recognition of pore geometry. The Ca1 strata of the Brońsko-1 and Brońsko-2 wells, located on the Zechstein Brońsko Reef (West Poland), were studied to determine the influence of fossils on porosity and permeability. It was concluded that greater diversification of the original biota led to an increase in porosity and variation in pore geometry. While encrusting organisms such as foraminifers promoted the development of channel and fracture porosity, the dissolution of the primarily aragonitic bivalve and gastropod shells and the shells of terebratulid brachiopods often gave rise to the formation of cavernous and mouldic porosity. The channels appear to be most common in the bryozoan-foraminifer biofacies, representing a shallowing of the depositional environment. Caverns, in turn, corresponded to the organisms of the brachiopod-bryozoan and the lightly karstified bivalve-gastropod biofacies, both of which probably experienced the influence of sabkha conditions, leading to a general decrease in porosity. The bryozoan zoecia tended to enhance both primary intraparticle voids, and after their dissolution, secondary intraparticle pores, which showed limited connectivity in the high-energy Acanthocladia biofacies, where considerable fragmentation of fossils took place, hence decreasing the permeability. Anhydrite cementation was found to be the most pronounced factor controlling porosity destruction, while dolomitization enhanced it significantly, especially for the stromatolitic biofacies, where small, unconnected vugs were formed owing to this process. The permeability is typically below 100 mD, and this is caused by the rich diagenetic history of the reef, that recorded marine, sabkha-related and burial cementation, now represented by the different fabrics of anhydrite, calcite, and dolomite.
Źródło:
Annales Societatis Geologorum Poloniae; 2019, 89, 1; 47-81
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem with flow in radial channels synchronous machine
Autorzy:
Makki, Z.
Janda, M.
Deeb, R.
Powiązania:
https://bibliotekanauki.pl/articles/377188.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
radial channels
synchronous machine
flow rate
Opis:
This paper describes the use of computational methods for solving the flow of the air-cooling in the large synchronous machines where it is used to cool the stator winding and stator radial channels which are located between the stator packet sheets. The overall process flow is mostly influenced by the size of air gap between stator and rotor, the shape of the radial channels, and by flow rates in machines. This paper mostly discusses about the influence flow rate of the cooling medium which has effects on the pressure distribution and flow rate in the radial channels. Cooling medium considered in this article an air and for and for calculation was chosen ANSYS CFX.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 75-82
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a New Approach to SNR Estimation of BPSK Signals
Autorzy:
Moazzeni, T.
Amei, A.
Ma, J.
Jiang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/227148.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital communication
statistical analysis
AWGN channels
Opis:
Signal-to-noise ratio (SNR) information is required in many communication receivers and their proper operation is, to a large extent, related to the SNR estimation techniques they employ. Most of the available SNR estimators are based on approaches that either require large observation length or suffer from high computation complexity. In this paper, we propose a low complexity, yet accurate SNR estimation technique that is sufficient to yield meaningful estimation for short data records. It is shown that our estimator is fairly close to the (CRLB) for high SNR values. Numerical results also confirm that, in terms of convergence speed, the proposed technique outperforms the popular moment based method, M2M4.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 3; 273-278
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion channels-related diseases.
Autorzy:
Dworakowska, Beata
Dołowy, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1044310.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
nicotinic acetylcholine receptor
cGMP-gated channel
ion channels
glycine receptor
voltage-gated channels
channel-related genetic disorders
Opis:
There are many diseases related to ion channels. Mutations in muscle voltage-gated sodium, potassium, calcium and chloride channels, and acetylcholine-gated channel may lead to such physiological disorders as hyper- and hypokalemic periodic paralysis, myotonias, long QT syndrome, Brugada syndrome, malignant hyperthermia and myasthenia. Neuronal disorders, e.g., epilepsy, episodic ataxia, familial hemiplegic migraine, Lambert-Eaton myasthenic syndrome, Alzheimer's disease, Parkinson's disease, schizophrenia, hyperekplexia may result from dysfunction of voltage-gated sodium, potassium and calcium channels, or acetylcholine- and glycine-gated channels. Some kidney disorders, e.g., Bartter's syndrome, policystic kidney disease and Dent's disease, secretion disorders, e.g., hyperinsulinemic hypoglycemia of infancy and cystic fibrosis, vision disorders, e.g., congenital stationary night blindness and total colour-blindness may also be linked to mutations in ion channels.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 685-703
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endothelium as target for large-conductance calcium-activated potassium channel openers
Autorzy:
Wrzosek, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1040527.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
endothelium-derived hyperpolarising factor
potassium channels
endothelium
Opis:
The endothelium is a highly active organ responsible for vasculatory tone and structure, angiogenesis, as well as hemodynamic, humoral, and inflammatory responses. The endothelium is constantly exposed to blood flow, sheer stress and tension. Endothelial cells are present as a vasculature in every tissue of the body and react to and control its microenvironment. A variety of ion channels are present in the plasma membranes of endothelial cells. These include potassium channels such as inwardly rectifying potassium (Kir) channels, voltage-dependent (Kv) channels, ATP-regulated potassium (KATP) channels and three types of calcium-activated potassium channels (KCa), the large (BKCa), intermediate (IKCa), and small (SKCa) -conductance potassium channels. Potassium current plays a critical role in action potentials in excitable cells, in setting the resting membrane potential, and in regulating neurotransmitter release. Mitochondrial isoforms of potassium channel contribute to the cytoprotection of endothelial cells. Prominent among potassium channels are families of calcium-activated potassium channels, and especially large-conductance calcium-activated potassium channels. The modulation of BKCa channels, which are voltage- and calcium-dependent, has been intensively studied. The BKCa channels show large expression dynamics in endothelial cells and tissue-specific expression of large numbers of alternatively spliced isoforms. In this review, a few examples of the modulatory mechanisms and physiological consequences of the expression of BKCa channels are discussed in relation to potential targets for pharmacological intervention.
Źródło:
Acta Biochimica Polonica; 2009, 56, 3; 393-404
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmembrane segment M2 of glycine receptor as a model system for the pore-forming structure of ion channels.
Autorzy:
Bednarczyk, Piotr
Szewczyk, Adam
Dołowy, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1043689.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
black lipid membrane
ion channels
glycine receptor
Opis:
The glycine receptor belongs to the ligand-gated ion channel superfamily. It is a chloride conducting channel composed of four transmembrane domains. It was previously shown that the second transmembrane domain (M2) of the glycine receptor forms an ion conduction pathway throught lipid bilayers. The amino-acid sequence of the transmembrane segment M2 of the glycine receptor has a high homology to all receptors of the ligand-gated ion channel superfamily. In our report, we have used a synthetic M2 peptide. It was incorporated into a planar membrane of known lipid composition and currents induced by M2 were measured by the Black Lipid Membrane technique. When the planar lipid bilayer was composed of 75% phosphatidylethanolamine and 25% phosphatidylserine, the reversal potential measured in a 150/600 mM KCl (cis/trans) gradient was -19 mV suggesting that the examined pore was preferential to anions, PK/PCl = 0.25. In contrast, when 75% phosphatidylserine and 25% phosphatidylethanolamine was used, the reversal potential was +20 mV and the pore was preferential to cations, PK/PCl = 4.36. Single-channel currents were recorded with two predominant amplitudes corresponding to the main-conductance and sub-conductance states. Both conductance states (about 12 pS and 30 pS) were measured in a symmetric solution of 50 mM KCl. The observed single-channel properties suggest that the selectivity and conductance of the pore formed by the M2 peptide of the glycine receptor depend on the lipid composition of the planar bilayer.
Źródło:
Acta Biochimica Polonica; 2002, 49, 4; 869-875
0001-527X
Pojawia się w:
Acta Biochimica Polonica
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
Tytuł:
Consumptions Structure and Consumer Insights for Dairy Products - Avoidance, Distribution, own Production and Occasions for Consumption
truktura i prawidłowości dotyczące konsumpcji produktów mlecznych - unikanie, kanały dystrybucji, samozaopatrzenie, okazje spożywania
Autorzy:
Wielicka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2033435.pdf
Data publikacji:
2004-12-31
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
Consumption
Consumer
Milk market
Distribution channels
Supply
Opis:
The paper presents some features of population regarding consumption of dairy products, which is examined in four following areas: avoidance, places of purchase, inclination to undertaking own production, occasions for consumption. The research resulted in following findings. Taste is the most important reason to reject milk products. Consumers buy them mainly in convenience stores. High number of consumers produce milk products. The most frequent occasion for consumption of dairy products is breakfast. Also milk drinks accompany mainly this meal.
Praca ma na celu scharakteryzowanie konsumenta produktów mlecznych w czterech wybranych wymiarach:1) przyczyn rezygnacji z konsumpcji,2) miejsc zakupu produktów mlecznych,3) przetwarzania mleka we własnym zakresie,4) okazji spożywania produktów mlecznych.Wyniki badań przedstawiają się następująco:1) najczęstszym powodem odrzucenia produktów mlecznych jest ich smak,2) najczęstszym miejscem zakupu są sklepy osiedlowe położone blisko miejsca zamieszkania respondentów,3) produkcja własna przetworów mlecznych dotyczy znacznego procentu badanych,4) produkty mleczne najczęściej są konsumowane podczas śniadania.
Źródło:
Journal of Agribusiness and Rural Development; 2004, 3, 359; 211-227
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser modified functional carbon-based coatings on titanium substrate for cardiac tissue integration and blood clotting inhibition
Autorzy:
Major, Roman
Ostrowski, Roman
Surmiak, Marcin
Trembecka-Wójciga, Klaudia
Lackner, Jurgen
Powiązania:
https://bibliotekanauki.pl/articles/1844973.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
thin layers
migration channels
laser ablation
microstructure
Opis:
The work focused on developing functional coatings on titanium substrates that would facilitate the integration with the cardiac tissue and with a specific form of connective tissue like blood. Surface modifications consisted in the laser evaporation of part of the biocompatible layer, thus creating a suitable environment for a particular tissue. For the myocardium integration, the metal surface was refined by biohemocompatible coatings. Such surfaces were the starting point for further modifications in the form of channels. The channeled surfaces enabled a controlled cell migration and proliferation. The interaction of endothelial cells with the material was highly dependent on the surface characteristics such as: topography, microstructure or mechanical properties. The controlled cellular response was achieved by modifying the surface to obtain a network of wells or channels of different dimensions via the laser interference lithography. This technique determined a high resolution shape, size and distribution patterns. As a result, it was possible to control cells in the scale corresponding to biological processes. The surface periodization ensured the optimal flow of oxygen and nutrients within the biomaterial, which was of a key importance for the cell adhesion and proliferation. The work attempted at producing the surface networks mimicking natural blood vessels. To stimulate the formation of new blood vessel the finishing resorbable synthetic coatings were applied on the surface to act as a drug carrier. Therefore, the initial trial to introduce factors stimulating the blood vessels growth was performed.
Źródło:
Engineering of Biomaterials; 2020, 23, 155; 22-31
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of distribution and sales of low alcohol beverages in Poland
Autorzy:
Majchrzak-Lepczyk, Justyna
Szymczak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1833810.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
distribution
distribution channels
sale techniques
logistics
innovations
Opis:
The struggle for the customer is symptomatic of the companies operating on contemporary markets. Developing new distribution channels and sales techniques is manifestation of the struggle. Dynamic market changes determine how vendors operate and induce them to implement innovation concepts in distribution, sales and logistics. These original solutions create new shopping modes and possibilities. The purpose of the paper is to present new solutions in this area, which are implemented and used within the alcohol industry in Poland. Scope of the study relates to beverages of low alcohol excluding beer. The authors focus mainly on solutions for distribution and sales, but they won’t pass over complementary solutions for customer communication, including those aimed at education of consumers, which is essential in this industry. The structure of the paper makes it possible to present transformation of alcohol market in Poland, taking into account changes in the processes and the value they create for the consumer.
Źródło:
Research in Logistics & Production; 2020, 10, 1; 23--34
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organized Economic Interests and European Integration: the Question of (neo)corporatism
Autorzy:
Ząbkowicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/517154.pdf
Data publikacji:
2014
Wydawca:
Instytut Badań Gospodarczych
Tematy:
economic interests
channels of access
European Union
Opis:
When economic development is considered, political economy is at stake; in this perspective growth or counter-growth forces operate within the institutional framework. The analysis focuses on corporatist forms of social dialogue in the international environment of the EU and within the European structures. First, the notion of corporatism as opposed to other institutionalized channels of access is explained. Then, the paper presents corporatist forms at the national level under change. Next, it deals with interest coordination at the European Commission level. The paper concludes that an erosion of corporatist forms is visible; no embracing pattern in the EU should be expected instead; on the contrary, increasing fragmentation of lobbying is observed.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2014, 9, 1; 7-20
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
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