Pokaż publikacje z roku
-
Pokaż wszystkie publikacje z roku 2025
-
Pokaż wszystkie publikacje z roku 2024
-
Pokaż wszystkie publikacje z roku 2023
-
Pokaż wszystkie publikacje z roku 2022
-
Pokaż wszystkie publikacje z roku 2021
-
Pokaż wszystkie publikacje z roku 2020
-
Pokaż wszystkie publikacje z roku 2019
-
Pokaż wszystkie publikacje z roku 2018
-
Pokaż wszystkie publikacje z roku 2017
-
Pokaż wszystkie publikacje z roku 2016
-
Pokaż wszystkie publikacje z roku 2015
-
Pokaż wszystkie publikacje z roku 2014
-
Pokaż wszystkie publikacje z roku 2013
-
Pokaż wszystkie publikacje z roku 2012
-
Pokaż wszystkie publikacje z roku 2011
-
Pokaż wszystkie publikacje z roku 2010
-
Pokaż wszystkie publikacje z roku 2009
-
Pokaż wszystkie publikacje z roku 2008
-
Pokaż wszystkie publikacje z roku 2007
-
Pokaż wszystkie publikacje z roku 2006
-
Pokaż wszystkie publikacje z roku 2005
-
Pokaż wszystkie publikacje z roku 2004
-
Pokaż wszystkie publikacje z roku 2003
-
Pokaż wszystkie publikacje z roku 2002
-
Pokaż wszystkie publikacje z roku 2001
-
Pokaż wszystkie publikacje z roku 2000
-
Pokaż wszystkie publikacje z roku 1999
-
Pokaż wszystkie publikacje z roku 1998
-
Pokaż wszystkie publikacje z roku 1988
-
Pokaż wszystkie publikacje z roku 1987
-
Pokaż wszystkie publikacje z roku 1980
Publikacje z roku 2016
Pokaż wszystkie-
Gross Exports Versus Value-Added Exports: Determinants and Policy Implications for Manufacturing Sectors in Selected CEE Countries
- Magdalena Olczyk
- Aleksandra Kordalska
This article assesses the impact of selected determinants on both value-added exports and gross exports for seven CEE economies, based on thirteen manufacturing subsectors for the years 1995–2011. The results show a decrease in domestic value-added, especially in high-tech industries. The impact of the determinants, except for vertical specialization, is similar for exports in value-added and in gross terms. The results indicate that labor productivity and highly skilled employees have a greater impact on generating domestic value-added. CEE countries do not achieve comparative advantages of a capital-intensive nature. Manufacturing does not serve a “carrier function” for services.
-
Grupy producenckie jako beneficjenci restrukturyzacji rynków rolnych
- Piotr Giruć
W artykule przedstawiono zagadnienie integracji rynku na przykładzie funkcjonowania grup producenckich na rynkach rolnych, ze szczególnym uwzględnieniem roli producentów zbóż. Grupy producenckie ze względu na swoje zalety są ważnym podmiotem wokół którego można by stworzyć dobrze funkcjonujący system skupu i przechowalnictwa zbóż. Grupy producenckie działając w otoczeniu instytucjonalnym agrobiznesu są w kręgu oddziaływania różnych instytucji. Oddziaływanie otoczenia instytucjonalnego wymusza określone reakcje, które przynoszą wymierne korzyści, ale i ograniczenia dla funkcjonowania grup producenckich. Wsparcie inwestycyjne kierowane głównie do grup producenckich funkcjonujących w rolnictwie jest przejawem zmian i kierunków przekształceń polskiego sektora rolno-spożywczego. Pomoc ta jest udzielana przede wszystkim podmiotom funkcjonującym na obszarach o niekorzystnych bądź trudnych warunkach produkcji.
-
Guided waves for monitoring of plate structures with linear cracks of variable length
- Beata Zima
- Magdalena Rucka
Damage occurring at the work of plate structures may grow to a considerable size. The joint action – the detection of a defect at the earliest possible stage, the monitoring of its growth and the determination of its critical size in the context of structural reliability allows optimizing the cost of the maintenance and repair of structural elements. Thus the development of monitoring systems for permanent observation of fault evolution is of great importance among civil, mechanical and aerospace engineering communities. This paper focuses on a diagnostic system dedicated for plate structures with a variable length linear crack using the guided wave-based technique and a novel ellipse-based binary damage imaging algorithm. The emphasis is put on the relationship between the configuration of embedded piezoelectric transducers and the extent of a defect possible to identify. Numerical and experimental results show that the proposed diagnostic system has a great potential for the implementation in monitoring systems dedicated for the evaluation of damage growth.
-
Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition).
- Daniel Klionsky
- Kotb Abdelmohsen
- Akihisa Abe
- Anna Skwarska
No Abstract
-
Guitar String Sound Retrieved from Moving Pixels
- Bożena Kostek
- Piotr Szczuko
- Józef Kotus
- Maciej Szczodrak
- Andrzej Czyżewski
The aim of this study was to develop a method of visual recording and analyzing the vibrations of guitar strings using high-speed cameras and dedicated video processing algorithms. The recording of a plucked string reveals the way in which the deformations propagate, composing the standing and travelling wave. The paper compares the results for a few selected models of classical and acoustic guitars, and it involves processing the vibration image into to the sound recording. The sound reconstructed in this way is compared with the sound recorded synchronously with the reference measurement microphone.
-
-
Halogen bonded polypseudorotaxanes based on a pillar[5]arene host
- Katarzyna Eichstaedt
- B. Wicher
- M. Gdaniec
- Tadeusz Połoński
Two crystalline supramolecular polypseudorotaxanes were obtained by combining permethylated pillar[5]arene as a macrocyclic wheel with 1,4-bis(1-imidazolyl)butane and 1,4-bis(iodoethynyl)benzene or 1,4-diiodo-1,3-butadiyne linked by C–I⋯N halogen bonds and creating a polyrotaxane axis. The resulting highly ordered supramolecular arrays were characterized by X-ray crystallography.
-
Hard lessons learned: delivering usability in IT projects
- Krzysztof Redlarski
- Paweł Weichbroth
Effective project management requires the development of a realistic plan which aims to ensure the success of the project and ultimately deliver a high quality product to customers. However, experience shows that the majority of software vendors managing projects suffer from numerous problems to provide usability in IT solutions and complete a project in a given time with success. In this paper we discuss, analyze and synthesize the outcomes of a study conducted among IT firms in Poland. As a result, we have identified eight stimulants and three non-stimulants that affect the usability of software products, which later were stratified into three levels. Finally, we outline some of the lessons learned, summarized and expressed as a set of eleven goal-oriented rules.
-
Hardware-Software Implementation of Basic Principles Simulator of Nuclear Reactor Processes
- Tomasz Karla
- Jarosław Tarnawski
- Kazimierz Duzinkiewicz
The paper presents implementation process of basic principle simulators of a nuclear reactor processes. Simulators are based on point-models of processes: kinetics of neutrons, heat generation and exchange, poisoning and burning-up nuclear fuel. Reference simulator was developed in MATLAB/Simulink without taking into account real-time operation. Second simulator was built using the toolbox xPC with hard real-time requirements. Functional decomposition of a nuclear reactor was performed and processes with different time scales were isolated. Simulation of each separated process in Raspberry PI computer with coordination mechanism among them led to a distributed soft real-time simulator. Idea of web-based simulator is also presented. The engine of the web-based simulator can be implemented on the server while the presentation of the state of the simulator and the prescription of parameters can be performed using a web browser. This allows simultaneous access to the simulator using different devices, including mobile as tablets, laptops and mobile phones. Compliance tests of simulators with reference simulator were conducted and the results proved the correctness of implementation. A review of the properties and potential applications of the various versions of developed simulators is presented.
-
Harmony Search for Data Mining with Big Data
- Jerzy Balicki
- Piotr Dryja
- Waldemar Korłub
In this paper, some harmony search algorithms have been proposed for data mining with big data. Three areas of big data processing have been studied to apply new metaheuristics. The first problem is related to MapReduce architecture that can be supported by a team of harmony search agents in grid infrastructure. The second dilemma involves development of harmony search in preprocessing of data series before data mining. Moreover, harmony search as a classification algorithm is studied as the third application. Finally, some outcomes for numerical experiments are submitted.
-
Harmony Search for Self-configuration of Fault–Tolerant and Intelligent Grids
- Jerzy Balicki
- Waldemar Korłub
- Jacek Paluszak
- Maciej Tyszka
In this paper, harmony search algorithms have been proposed to self-configuration of fault-tolerant grids for big data processing. Self-configuration of computer grids lies in the fact that new computer nodes are automatically configured by software agents and then integrated into the grid. A base node works due to several configuration parameters that define some aspects of data communications and energy power consumption. We propose some optimization agents that are based on harmony search to find a suboptimal configuration of fault-tolerant grids processing big data. Criteria such as probability that all tasks meet their deadlines and also a reliability of grid are considered. Finally, some experimental results have been considered.
-
Harmony Search to Self-Configuration of Fault-Tolerant Grids for Big Data
- Jerzy Balicki
- Waldemar Korłub
- Maciej Tyszka
In this paper, harmony search algorithms have been proposed to self-configuration of fault-tolerant grids for big data processing. Some tasks related to big data processing have been considered. Moreover, two criteria have been applied to evaluate quality of grids. The first criterion is a probability that all tasks meet their deadlines and the second one is grid reliability. Furthermore, some intelligent agents based on harmony search have been developed to support a middleware layer of grids.
-
Hasse diagram as a green analytical metrics tool: ranking of methods for benzo[a]pyrene determination in sediments
- Paulina Bigus
- Stefan Tsakovski
- Vasil Simeonov
- Jacek Namieśnik
- Marek Tobiszewski
This study presents an application of the Hasse diagram technique (HDT) as the assessment tool to select the most appropriate analytical procedures according to their greenness or the best analytical performance. The dataset consists of analytical procedures for benzo[a]pyrene determination in sediment samples, which were described by 11 variables concerning their greenness and analytical performance. Two analyses with the HDT were performed—the first one with metrological variables and the second one with “green” variables as input data. Both HDT analyses ranked different analytical procedures as the most valuable, suggesting that green analytical chemistry is not in accordance with metrology when benzo[a]pyrene in sediment samples is determined. The HDT can be used as a good decision support tool to choose the proper analytical procedure concerning green analytical chemistry principles and analytical performance merits.
-
Heat capacities and thermodynamic properties of antimony substituted lanthanum orthoniobates
- Aleksandra Dorota Mielewczyk-Gryń
- Sebastian Lech Wachowski
- Judyta Strychalska-Nowak
- Krzysztof Zagórski
- Tomasz Klimczuk
- Alexandra Navrotsky
- Maria Gazda
The results of heat capacity measurements for the lanthanum orthoniobate substituted with 10, 20 and 30 mol% of antimony (LaNb0.9Sb0.1O4, LaNb0.8Sb0.2O4 and LaNb0.7Sb0.3O4) are presented and discussed. Temperature dependence of low temperature heat capacity was analyzed within the Debye and Einstein models. The Debye temperature decreased, whereas the Einstein temperature increased with antimony content. The decrease of the Debye temperature with increasing antimony content was correlated with decreasing scheelite–fergusonite transition temperature. The increase of the Einstein temperature of LaSbxNb1−xO4 with increasing antimony content may indicate increasing frequency of optical vibrations of Nb(Sb)–O4−2 polyhedra relative to La3+ cations. Using the heat capacity data, standard entropies of the phases were calculated and combined with previously measured enthalpies of formation to obtain Gibbs energies of formation. Standard thermodynamic properties were tabulated
-
Heat transfer characteristics of hybrid microjet – Microchannel cooling module
- Tomasz Muszyński
- Rafał Andrzejczyk
The paper presents experimental investigation of heat transfer intensification in a microjet–microchannel cooling module. Applied technology takes benefits from two very attractive heat removal techniques. When jets are impinging on the surface, they have a very high kinetic energy at the stagnation point, also in microchannels boundary layer is very thin allowing to obtain very high heat fluxes. Main objective of this paper was to experimentally investigate the performance of a microjet– microchannel cooling module. Intense heat transfer in the test section has been examined and described with precise measurements of thermal and flow conditions. Reported tests were conducted under steady state conditions for single phase liquid cooling. Obtained database of experimental data were compared to standard cooling techniques, and com- pared with superposed semi-empirical models for minichannels and microjet cooling. Gathered data with analytical solutions and numerical computer simulation allows the rational design and calculation of hybrid modules and optimum performance of these modules for various industrial applications.
-
Heat transfer in plate heat exchanger channels: experimental validation of selected correlation equations
- Janusz Cieśliński
- Artur Fiuk
- Krzysztof Typiński
- Bartłomiej Siemieńczuk
This study is focused on experimental investigation of selected type of brazed plate heat exchanger. The Wilson approach was applied in order to estimate heat transfer coefficients for the PHEx passages. The main aim of the paper was to experimentally check ability of several correlations published in the literature to predict heat transfer coefficients by comparison experimentally obtained data with appropriate predictions. The results obtained revealed that Hausen and Dittus-Bölter correlations underestimated heat transfer coefficient for the tested PHEx by an order of magnitude. The Aspen Plate code overestimated heat transfer coefficient by about 50%, while Muley-Manglik correlation overestimated it from 1% to 25%, dependent on the value of Reynolds number and hot or cold liquid side.
-
HETEROGENICZNY SYSTEM BEZPRZEWODOWEJ ŁĄCZNOŚCI NA MORZU BAŁTYCKIM
- Michał Hoeft
- Krzysztof Gierłowski
- Józef Woźniak
W artykule przedstawiono podstawowe założenia dotyczące realizacji systemu heterogenicznej samoorganizującej się sieci bezprzewodowej zapewniającej łączność na obszarze morskim, między innymi na potrzeby usług e-nawigacji. Wskazano na ograniczenia istniejących systemów, w tym systemów satelitarnych, pokazując jednocześnie potrzebę opracowania nowego rozwiązania. Autorzy przedstawili dedykowane mechanizmy i systemy o zróżnicowanych możliwościach transmisji danych proponowane do wykorzystywania na różnych obszarach morza. Szczególną uwagę zwrócono na praktyczne korzyści płynące z proponowanego systemu w postaci nowych możliwości wdrażania usług e-nawigacji oraz usług akwizycji i szybkiego transferu różnych typów danych.
-
Heterotrophic Anodic Denitrification in Microbial Fuel Cells
- Jakub Drewnowski
- Francisco Fernandez-Morales
Nowadays, pollution caused by energy production systems is a major environmental concern. Therefore, the development of sustainable energy sources is required. Amongst others, the microbial fuel cell (MFC) seems to be a possible solution because it can produce clean energy at the same time that waste is stabilized. Unfortunately, mainly due to industrial discharges, the wastes could contain nitrates, or nitrates precursors such ammonia, which could lead to lower performance in terms of electricity production. In this work, the feasibility of coupling anodic denitrification process with electricity production in MFC and the effect of the nitrates over the MFC performance were studied. During the experiments, it was observed that the culture developed in the anodic chamber of the MFC presented a significant amount of denitrificative microorganisms. The MFC developed was able to denitrify up to 4 ppm, without affecting the current density exerted, of about 1 mA/cm2. Regarding the denitrification process, it must be highlighted that the maximum denitrification rate achieved with the culture was about 60 mg·NO3−·L−1·h−1. Based on these results, it can be stated that it is possible to remove nitrates and to produce energy, without negatively affecting the electrical performance, when the nitrate concentration is low.
-
High Temperature Corrosion Evaluation of Porous Hastelloy X Alloy in Air and Humidified Hydrogen Atmospheres
- Sebastian Molin
- Katarzyna Dunst
- Jakub Karczewski
- Piotr Jasiński
In this work a commercially available porous Hastelloy X alloy is characterized in terms of high temperature corrosion resistance. The alloy was oxidized in the temperature range from 500C to 900C in air and humidified hydrogen for 100 hours. Corrosion rates and porosity changes were measured. Microstructural characterization was performed using X-ray diffractometry and scanning electron microscopy. Results show that porous alloys oxidize rapidly even for the relatively short time of the study. Long term operation in fuel cell conditions seems feasible especially in hydrogen atmosphere at temperatures preferably not exceeding 700C.
-
High temperature drying of beech with content of tension wood
- Vilkovska Tatiana
- Klement Ivan
- Aleksandra Konopka
- Jacek Barański
The presented artcle is focused on comparison of tension and normal wood of beech (Fagus sylvatica L.) in a high-temperature drying process. Samples of 26 mm thickness were selected from sapwood zone with different angle of growth rings. The article evaluated properties of tension and normal wood before and after drying process. Properties which are monitored were moisture, moisture gradients, covering tests, colour changes and longitudinal warping. Tension wood and dominant cause of these defects is often attributed to the excessive axial shrinkage of reacton wood, which is driven by the shrinkage of the G-layer in tension wood. This scrutinised mocroscopic sign has many influences for other properties of tension wod in the technological processes.