Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "W.D." wg kryterium: Autor


Tytuł:
The Research on Characterization of Crushability for Foundry Sand Particles
Autorzy:
Dai, Y.
Ma, Q. Y.
Li, X. H.
Zhang, X.
Hu, F. P.
Zhang, Y.
Xie, W. D.
Powiązania:
https://bibliotekanauki.pl/articles/379689.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry sand particle
mechanical load
AFS grain fineness
crushability
piasek odlewniczy
obciążenie mechaniczne
rozdrobnienie ziarna
Opis:
In this paper, crushability of foundry sand particles was studied. Three kinds of in-service silica sands in foundry enterprises selected as the study object, and foundry sand particles were subjected to mechanical load and thermal load during service were analyzed. A set of methods for simulating mechanical load and thermal load by milling and thermal-cold cycling were designed and researched, which were used to characterize the crushability for silica sand particles, the microstructure was observed by SEM. According to the user’s experience in actual application, the crushability of Sand C was the best and then Sand B, the last Sand A. The results indicated that mechanical load, thermal load and thermal-mechanical load can all be used to characterize the crushability of foundry sand particles. Microscopic appearances can qualitatively characterize the crushability of foundry sand particles to a certain extent, combining with the additions and cracks which are observed on the surface.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 231-235
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and sequence analysis of the complete VP2 gene of canine parvovirus from Chinese domestic pets and determination of the pathogenesis of these circulating strains in beagles
Autorzy:
Chen, M.R.
Guo, X.Y.
Wang, Z.Y.
Jiang, Y.T.
Yuan, W.F.
Xin, T.
Hou, S.H.
Song, T.Q.
Lin, W.D.
Zhu, H.F.
Jia, H.
Powiązania:
https://bibliotekanauki.pl/articles/2087542.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
canine parvovirus
molecular epidemiology
phylogenetic analysis
pathogenesis
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 287-296
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observer-based leader-following formation control of uncertain multiple agents by integral sliding mode
Autorzy:
Qian, D. W.
Tong, S. W.
Li, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/201511.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-agent system
formation control
integral sliding mode control
uncertainty
nonlinear disturbance observer
stability
system wieloagentowy
kontrola formacji
integralne sterowanie ślizgowe
niepewność
nieliniowy obserwator zakłóceń
stabilność
Opis:
This paper investigates the formation control problem of multiple agents. The formation control is founded on leader-following approaches. The method of integral sliding mode control is adopted to achieve formation maneuvers of the agents based on the concept of graph theory. Since the agents are subject to uncertainties, the uncertainties also challenge the formation-control design. Under a mild assumption that the uncertainties have an unknown bound, the technique of nonlinear disturbance observer is utilized to tackle the issue. According to a given communication topology, formation stability conditions are investigated by the observer-based integral sliding mode formation control. From the perspective of Lyapunov, not only is the formation stability guaranteed, but the desired formation of the agents is also realized. Finally, some simulation results are presented to show the feasibility and validity of the proposed control scheme through a multi-agent platform.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 35-44
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analysis of the control stage of a high speed steam turbine
Autorzy:
Sławiński, D.
Zakrzewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/175498.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control stage
residual stresses
initial displacement blade
vibrations blade
Opis:
This paper analyzes the possibility of resonances within a control stage of a high speed turbine. An original method for steady state operation is used for the analysis of the stiffness matrix representing: initial displacement blade (nominal shape blade obtained by nominal working point of turbine) and residual stresses following local crossing yield plastic strain. In the analysis there has been found a possibility of occurance of the resonance frequency, and mistuning by showing the safe working ranges. The calculation used the 3D modal and harmonic analysis within computational solid dynamics (CSD) and the results were compared with the 0D data from literature. After local crossing of yields stresses, on the basis of the harmonic analysis, there has been shown operation of the blade in the resonance point. Before crossing the yield stresses the blade is working in mistuning and a safe point.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 41-49
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure Modelling Based on Percolation Theory
Autorzy:
Trzaskowski, W.
Myszka, D.
Powiązania:
https://bibliotekanauki.pl/articles/381630.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
design of materials
percolation theory
incremental manufacturing
3D printing
projektowanie materiałów
teoria perkolacji
drukowanie 3D
Opis:
The paper discusses the possibility of application of percolation theory to model the structure of materials in a virtual space. The designed models were transferred to real space using modern incremental manufacturing techniques like 3D printing. Studies of model materials of this type based on percolation theory are expected to provide more accurate knowledge of the problem, which is extremely important from the point of view of the properties of most construction materials. Reference of percolation phenomena to materials science is more and more frequently done in the design of various types of composite materials, such as e.g. conductive composites. In this study, the percolation theory has been used to design in microscale an optimum material through model analysis done in macroscale. Since studies of percolation in polycrystalline materials are difficult, and there are also some technical limitations imposed on the evaluation done in a volume of material, this phenomenon is usually examined in a simplified manner, which means that it is reduced only to statistical analysis of potential percolation with determination of its threshold value. To generate a potential structure based on percolation theory, popular computer programmes for solid modelling were used. Real shapes were conferred to the designed models using a widely known technique of 3D printing. It allows the production of parts in ABS material. The subject of the present study combines modern design techniques with modern manufacturing techniques, relating both to the fundamentals of materials science. Today's software tools enable creating more complex solids, while their transfer to reality allows better understanding of dependencies that exist in the structure of materials. The originality of this study consists in the art of creating new construction materials with planned properties. The article offers a new approach to the capabilities of scheduling modern engineering materials with the help of percolation theory.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3 spec.; 71-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metrological Aspects of Abrasive Tool Active Surface Topography Evaluation
Autorzy:
Lipiński, D.
Kacalak, W.
Powiązania:
https://bibliotekanauki.pl/articles/221792.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grinding wheel
grain segmentation
watershed segmentation
image analysis
Opis:
Analysis of the shape and location of abrasive grain tips as well as their changes during the grinding process, is the basis for forecasting the machining process results. This paper presents a methodology of using the watershed segmentation in identifying abrasive grains on the abrasive tool active surface. Some abrasive grain tips were selected to minimize the errors of detecting many tips on a single abrasive grain. The abrasive grains, singled out as a result of the watershed segmentation, were then analyzed to determine their geometric parameters. Moreover, the statistical parameters describing their locations on the abrasive tool active surface and the parameters characterizing intergranular spaces were determined.
Źródło:
Metrology and Measurement Systems; 2016, 23, 4; 567-577
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional variable order anti-windup control strategy
Autorzy:
Sierociuk, D.
Malesza, W.
Powiązania:
https://bibliotekanauki.pl/articles/200019.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional calculus
variable order
PID control
anti-windup
rachunek różniczkowy
sterowanie PID
przebieg zmienności
Opis:
In this paper, a novel anti-windup strategy is presented. It is based on using fractional variable order integrator instead of integer order one in PID controller. It is shown that among four different types of variable order derivative definitions, only one gives satisfactory results – comparable, and even slightly better than the classical back-calculation anti-windup algorithm. Results are also presented in the form of simulation plots.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 427-432
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
27 dBm Microwave Amplifiers with Adaptive Matching Networks
Autorzy:
Rosolowski, D.
Wojtasiak, W.
Gryglewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/226524.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Adaptive Power Amplifiers (APAs)
components for Software Defined Radio
multi-band devices
multi-mode devices
RF
adaptivity
tunable matching networks
Opis:
The paper describes adaptive amplifier design with varactors and pin diodes as regulators of matching networks. As examples the two amplifiers with SHF-0189 HFET transistor and different matching sections were designed and manufactured. The output power level of 27 dBm and gain higher than 13 dB within L and S-band have been achieved. The amplifier design methodology is based on the small-signal approach and DC characteristics of transistors and regulators. Amplifier adaptivity allows us to remotely control the chosen parameters such as: frequency range, output power level, gain and etc.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 103-108
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern stored-product insect pest management
Autorzy:
Hagstrum, D.W.
Flinn, P.W.
Powiązania:
https://bibliotekanauki.pl/articles/66209.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Stored-product entomologists have a variety of new monitoring, decision-making, biological, chemical, and physical pest management tools available to them. Two types of stored-product insect populations are of interest: insects of immediate economic importance infesting commodities, and insects that live in food residues in equipment and facilities. The sampling and control methods change as grain and grain products move from field to consumer. There are also some changes in the major insect pest species to take into consideration. In this review, we list the primary insect pests at each point of the marketing system, and indicate which sampling methods and control strategies are most appropriate. Economic thresholds for insect infestation levels developed for raw commodity storage, processing plants, and retail business allow sampling-based pest management to be done before insect infestations cause economic injury. Taking enough samples to have a representative sample (20-30 samples) will generally provide enough information to classify a population as above or below an economic threshold.
Źródło:
Journal of Plant Protection Research; 2014, 54, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy-saving and by-products-free production of ethanol from granular corn starch
Autorzy:
Szymanowska, D.
Grajek, W.
Powiązania:
https://bibliotekanauki.pl/articles/80874.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bioethanol
corn starch
enzymatic hydrolysis
enzyme
ethanol
ethanol fermentation
fermentation
fermentation technology
gelatinization
hydrolysis
recycling
Saccharomyces cerevisiae
simultaneous saccharification
stillage
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of a recuperator construction with CFD methods
Autorzy:
Ludwig, W.
Zając, D.
Powiązania:
https://bibliotekanauki.pl/articles/185215.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
recuperator
modification
CFD
gas flow
rekuperator
modyfikacja
przepływ gazu
Opis:
The purpose of the work was initial modification of the construction of a commercially produced heat exchanger – recuperator with CFD (computational fluid dynamics) methods, based on designs and process parameters which were provided. Uniformity of gas distribution in the space between the tubes of the apparatus as well as the pressure drop in it were taken as modification criteria. Uniformity of the gas velocity field between the tubes of the heat exchanger should cause equalization of the local individual heat transfer coefficient values and temperature value. Changes of the apparatus construction which do not worsen work conditions of the equipment, but cause savings of constructional materials (elimination or shortening some parts of the apparatus) were taken into consideration.
Źródło:
Chemical and Process Engineering; 2017, 38, 4; 567-576
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shock safety modelling of indirect contact with low-voltage electric devices
Autorzy:
Korniluk, W.
Sajewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/141066.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zarządzanie bezpieczeństwem
system ekspertowy
sieć bayesowska
prawdopodobieństwo całkowite
ochrona przeciwporażeniowa
porażenie prądem elektrycznym
safety management process
expert system
Bayesian network
total probability
protection reliability states
appearance of touch and electric shock states
risk analysis and assessment
Opis:
The article presents a shock safety model of an indirect contact with a low-voltage electric device. This model was used for computations and analyses concerning the following: the probabilities of appearance of the particular shock protection unreliability states, electric shock states (ventricular fibrillation), contributions of the unreliability of different shock protection elements to the probability of occurrence of these states, as well as the risk of electric shock (and the shock safety), and contributions of the intensity of occurrence of damages to different shock protection elements to this risk. An example of a possibility to reduce the risk of an electric shock through changing the intensity of occurrence of damages to the selected protection elements was provided.
Źródło:
Archives of Electrical Engineering; 2011, 60, 3; 303-315
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for estimating probabilistic models of touch currents and impedance of human body relying on the effects of electric shock
Autorzy:
Korniluk, W.
Sajewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/141236.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
probability of occurrence of electric shock effects,
method for estimating
impedance of human body
touch currents
effects of electric shock
Opis:
The article provides a theoretical basis for a method allowing to calculate probability of effects of electric shock, as well as a method for determining probabilistic characteristics of random touch current values and of human body impedance in a person who suffered from specific effects of electric shock. Results of example calculations are presented, including probabilities of occurrence of sensory symptoms, exceeding the letgo threshold, and development of ventricular fibrillation, as well as probabilistic characteristics of random touch current values and of impedance of human body in people who experienced specific effects of electric shock.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 5-13
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shock safety modeling method for low-voltage electric devices
Autorzy:
Korniluk, W.
Sajewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/141402.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zarządzanie bezpieczeństwem
system ekspertowy
sieć bayesowska
prawdopodobieństwo całkowite
bezpieczeństwo porażeniowe
safety management process
expert system
Bayesian network
total probability
protection reliability states
appearance of touch and electric shock states
risk analysis and assessment
Opis:
The article describes a shock safety modeling method for low-voltage electric devices, based on using a Bayesian network. This method allows for taking into account all possible combinations of the reliability and unreliability states for the shock protection elements under concern. The developed method allows for investigating electric shock incidents, analysing and assessing shock risks, as well as for determining criteria of dimensioning shock protection means, also with respect to reliability of the particular shock protection elements. Dependencies for determining and analysing the probability of appearance of reliability states of protection as well as an electric shock risk are presented in the article.
Źródło:
Archives of Electrical Engineering; 2010, 59, 3-4; 153-167
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 100 W SiC MESFET Amplifier for L-band T/R Module of APAR
Autorzy:
Wojtasiak, W.
Gryglewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/226539.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high power amplifier
SiC
MESFET
T/R module
APAR
Opis:
In the paper, a 100W SiC MESFET amplifier design dedicated for a L-band T/R module of APAR is presented. The output power higher than 100 W has been achieved by combining in a balanced configuration two single stages with Cree's 60 W CRF24060 SiC MESFETs. The amplifier design methodology is based on the small-signal model and DC characteristics of SiC MESFET. The model is extracted using the transistor Sparameters at three operating points for On-state, Off-state and normally biased. The measurements and simulations prove usefulness of the proposed design method. The amplifier was excited with pulsed and cw signals for the case temperature ranging from 60°C to 140°C. As a result of the case temperature changes the output power drop was lower than 0.5 dB at the level of 150 W.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 135-140
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies