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Wyświetlanie 1-15 z 931
Tytuł:
Comparison of selected theoretical models of bubble formation and experimental results
Autorzy:
Rząsa, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/240032.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bubble formation
optical tomography
bubble flow measurement
tworzenie pęcherzy
tomografia optyczna
pomiar przepływu
Opis:
Designers of all types of equipment applied in oxygenation and aeration need to get to know the mechanism behind the gas bubble formation. This paper presents a measurement method used for determination of parameters of bubbles forming at jet attachment from which the bubles are displaced upward. The measuring system is based on an optical tomograph containing five projections. An image from the tomograph contains shapes of the forming bubbles and determine their volumes and formation rate. Additionally, this paper presents selected theoretical models known from literature. The measurement results have been compared with simple theoretical models predictions. The paper also contains a study of the potential to apply the presented method for determination of bubble structures and observation of intermediate states.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 21-36
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of optical to mography parameters for gas bubble shape analysis
Autorzy:
Rząsa, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/185491.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bubble shape
gas flow
optical
tomography
two-phase measurement
kształt bańki
przepływ gazu
tomografia
pomiar dwufazowy
Opis:
An optical tomograph in which a tested object is illuminated from five directions has been presented in the paper. The measurements of luminous intensity after changing into discrete signals (0 or 1) in the detectors equipped with 64 optical sensors were subjected to reconstruction by means of the matrix algorithm. Detailed description of the measuring sensor, as well as the principles of operation of the electronic system, has been given in the paper. Optical phenomena occurring at the phase boundary while transmitted through the sensor wall and phenomena inside the measuring space have also been taken into account. The method of the sensor calibration has been analysed and a way of technical solution of the problem under consideration has been discussed. The elaborated method has been tested using objects of the known shape and dimensions. It was found that reconstruction of the shapes of moving bubbles and determination of their main parameters is also possible with a reasonable accuracy.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 19-33
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying the optimal controller strategy for DC motors
Autorzy:
Qader, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/140815.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC Motor
LQR
PID
PI
controller strategy
Opis:
The aim of this study is to design a control strategy for the angular rate (speed) of a DC motor by varying the terminal voltage. This paper describes various designs for the control of direct current (DC) motors. We derive a transfer function for the system and connect it to a controller as feedback, taking the applied voltage as the system input and the angular velocity as the output. Different strategies combining proportional, integral, and derivative controllers along with phase lag compensators and lead integral compensators are investigated alongside the linear quadratic regulator. For each controller transfer function, the step response, root locus, and Bode plot are analysed to ascertain the behaviour of the system, and the results are compared to identify the optimal strategy. It is found that the linear quadratic controller provides the best overall performance in terms of steady-state error, response time, and system stability. The purpose of the study that took place was to design the most appropriate controller for the steadiness of DC motors. Throughout this study, analytical means like tuning methods, loop control, and stability criteria were adopted. The reason for this was to suffice the preconditions and obligations. Furthermore, for the sake of verifying the legitimacy of the controller results, modelling by MATLAB and Simulink was practiced on every controller.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 101-114
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying of security mechanisms to middle and high layers of OSI/ISO network model
Mechanizmy bezpieczeństwa w zastosowaniu śsrodkowych i górnych warstw sieciowego modelu OSI/ISO
Autorzy:
Kołodziejczyk, M.
Ogiela, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/375804.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AES
authentication
authorization
application
community string
dictionary attack
DDoS attack
DNS
DoS attack
hash function
HTTP
ICMP
IPv4
IPv6
man in the middle attack
MD5
OSI/ISO model
password
port scanning
protocol
SHA-1
sniffing
SNMP
spoofing
SYN flooding
TCP
tunnelling
UDP
Opis:
This article describes security mechanisms used by 3rd-7th layers in OSI/ISO network model. Many of commonly used protocols by these layers were designed with assumption that there are no intruders. Such assumption was true many years ago. The network situation has been changed for last few years and we should realize that some properties of existing protocols may be abused. Moreover, we should exchange some of them or create new versions. There are some methods and guidelines concerning secure programming, but there is also lack of guidelines about creating secure protocols. Authors see the necessity of such guideline and this article is an attempt at analysing existing solutions and selecting some universal and important patterns.
Artykuł opisuje popularne mechanizmy bezpieczeństwa stosowane w istniejących protokołach sieciowych środkowych i górnych warstw modelu OSI/ISO (od trzeciej warstwy włącznie). Wiele spośród tych protokołów zostało zaprojektowanych bardzo dawno temu i chociaż do dzisiaj są wykorzystywane i spisują się bardzo dobrze to jednak umożliwiają pewne nadużycia swojej funkcjonalności. Wiele z opisanych tutaj protokołów nie bierze pod uwagę ataków sieciowych. Autorzy postanowili wyselekcjonować pewną grupę protokołów, które mogą posłużyć do analizy zagrożeń sieciowych. Dzisiaj, mając pewne niebezpieczne rozwiązania jesteśmy bogatsi o pewne praktyczne doświadczenia z tym związane. Pozwala to analizować zagrożenie, klasyfikować je i wreszcie skutecznie im przeciwdziałać w nowych protokołach. Często są to rozwiązania lokalne, tworzone przez pewne grupy studentów lub konkretne firmy. Powstają również nowe, globalne rozwiązania. W pierwszym przypadku, nowy protokół może stanowić realne zagrożenie ze strony intruza. W drugim, należałoby poddać przynajmniej częściowej analizie formalnej nowe rozwiązanie. Istnieje wiele metod skupiających się na tworzonym oprogramowaniu, jednak często protokoły, jako rozwiązania autorskie są pomijane w analizie. Artykuł jest również próbą wstępnej klasyfikacji zagrożeń i stworzenia pewnych uniwersalnych rad dla twórców nowych rozwiązań. W pracy zarysowuje się potrzeba zmian pewnych istniejących rozwiązań, których słabości są opisane w artykule. Autorzy są przekonani, że niebezpieczny protokół nie może być użyty w bezpiecznym programie, bo jak np. można stworzyć bezpieczny program, jeśli protokół nie posiada odpowiedniego mechanizmu uwierzytelniania? Ten i wiele innych aspektów bezpieczeństwa zostało w pracy poruszonych i omówionych na przykładzie istniejących rozwiązań.
Źródło:
Theoretical and Applied Informatics; 2012, 24, 1; 95-106
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying mycelial compatibility groups of Sclerotinia sclerotiorum using Potato Dextrose Agar amended with activated charcoal
Autorzy:
Ojaghian, M.R.
Xie, G.
Powiązania:
https://bibliotekanauki.pl/articles/65686.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In this study, mycelial compatibility grouping (MCG) of Sclerotinia sclerotiorum (Lib.) de Bary was determined in 15 infected potato fields in Bahar and Lelehjin, Hamadan, Iran. Among 193 isolates, 37 MCGs were identified and 67% were represented by single isolates observed at single locations. Within Bahar fields, 29 MCGs were identified and 15 MCGs were recognized in Lalehjin samples. MCGs 2, 6, 18 and 25 were collected at high frequency from multiple locations. The efficacy of Potato Dextrose Agar (PDA) amended with activated charcoal for identifying MCGs in this fungus was tested in doubtful reactions and proved to be an effective medium. The activated charcoal produced a black reaction area in incompatible interactions as well as a red reaction line in PDA amended with McCormick's red food coloring.
Źródło:
Journal of Plant Protection Research; 2012, 52, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-course analysis of the artemisinin biosynthesis, and expression of genes coding for artemisinin pathway enzymes, in response to exogenous salicylic and gibberellic acids
Autorzy:
Mehrjerdi, M.Z.
Bihamta, M.-R.
Omidi, M.
Naghavi, M.-R.
Soltanloo, H.
Powiązania:
https://bibliotekanauki.pl/articles/80045.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
artemisinin
biosynthetic pathway
elicitor
malaria
medicinal plant
secondary metabolite
Artemisia annua
salicylic acid
gibberellic acid
gene coding
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the effect of the number of end-panel studs on the seismic properties of cold-formed light-steel shear-panel braces
Autorzy:
Tafti, M. R. J.
Behnamfar, F.
Powiązania:
https://bibliotekanauki.pl/articles/230627.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal formowana na zimno
rama stalowa lekka
usztywnienie na ścinanie
wytrzymałość boczna
współczynnik modyfikacji odpowiedzi
cold-formed steel
light steel frame
shear-panel bracing
lateral performance
response modification factor
Opis:
Detailed investigation of the effect of the number of end-panel studs on the seismic properties of light-steel shear-panel braces in cold-formed steel frames and in particular the associated response modification coefficients (R) factor, are presented in this paper. A total of 6 full-scale 1200×2400 mm specimens are considered, and the responses investigated under a standard cyclic loading regime. Of particular interest are the specimens’ maximum lateral load capacity and deformation behavior as well as a rational estimation of the seismic response modification factor. The study also looks at the failure modes of the system and investigates the main factors contributing to the ductile response of the tested shear-panel braces in order to suggest improvements so that braces respond plastically with a significant drift and without any risk of brittle failure, such as connection failure or stud buckling.
Źródło:
Archives of Civil Engineering; 2013, 59, 2; 197-214
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Stress Intensity Factor for an Internal Circumferential Crack in a Rotating Functionally Graded Thick-Walled Hollow Circular Cylinder under Thermal Shock
Autorzy:
Ghafoor, E. M. R.
Rokhi, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/139658.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal shock
circumferential cracks
functionally graded materials
thick-walled hollow cylinder
szok termiczny
pęknięcia obwodowe
funkcjonalne materiały gradientowe
grubościenny wydrążony w środku cylinder
Opis:
In this article, the fracture behavior of functionally graded thick-walled cylinder under thermo-mechanical shock is investigated. For this purpose, classical coupled thermoelastic equations are used in calculations. First, these equations are discretized with extended finite element method (XFEM) in the space domain and then they are solved by the Newmark method in the time domain. The most general form of interaction integral is extracted for axially symmetric circumferential crack in a cylinder under thermal and mechanical loads in functionally graded materials and is used to calculate dynamic stress intensity factors (SIFs). The problem solution has been implemented in MATLAB software.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 4; 455-479
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Earth observation and geospatial techniques for soil salinity and land capability assessment over Sundarban Bay of Bengal Coast, India
Autorzy:
Das, S.
Choudhury, M. R
Nagarajan, M.
Powiązania:
https://bibliotekanauki.pl/articles/145537.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
właściwości gleby
teledetekcja
dane satelitarne
Landsat
GIS and Remote Sensing
kriging
soil properties
land capability
Opis:
To guarantee food security and job creation of small scale farmers to commercial farmers, unproductive farms in the South 24 PGS, West Bengal need land reform program to be restructured and evaluated for agricultural productivity. This study established a potential role of remote sensing and GIS for identification and mapping of salinity zone and spatial planning of agricultural land over the Basanti and Gosaba Islands(808.314sq. km) of South 24 PGS. District of West Bengal. The primary data i.e. soil pH, Electrical Conductivity (EC) and Sodium Absorption ratio (SAR) were obtained from soil samples of various GCP (Ground Control Points) locations collected at 50 mts. intervals by handheld GPS from 0–100 cm depths. The secondary information is acquired from the remotely sensed satellite data (LANDSAT ETM+) in different time scale and digital elevation model. The collected field samples were tested in the laboratory and were validated with Remote Sensing based digital indices analysisover the temporal satellite data to assess the potential changes due to over salinization. Soil physical properties such as texture, structure, depth and drainage condition is stored as attributes in a geographical soil database and linked with the soil map units. The thematic maps are integrated with climatic and terrain conditions of the area to produce land capability maps for paddy. Finally, The weighted overlay analysis was performed to assign theweights according to the importance of parameters taken into account for salineareaidentification and mapping to segregate higher, moderate, lower salinity zonesover the study area.
Źródło:
Geodesy and Cartography; 2016, 65, 2; 163-192
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymmetry in nucleotide composition of sense and antisense strands as a parameter for discriminating open reading frames as protein coding sequences
Autorzy:
Cebrat, S
Dudek, M R
Rogowska, A
Powiązania:
https://bibliotekanauki.pl/articles/2046596.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concentration ellipse
yeast chromosome
DNA asymmetry
coding function
open reading frame
nucleotide composition
Saccharomyces cerevisiae
Opis:
Coding properties of yeast chromosomes were analysed and a strong asymmetry was found in nucleotide composition of sense and antisense strands. This property generates two very simple parameters - [A]/[T] and [G]/[C] of the sense strand - which could be used for discrimination of open reading frames as coding sequences with very high, statistically described level of significance. The paper contains a description of the method of ellipse of concentration in the two parameter space, which can close coding sequences inside, leaving a big fraction of noncoding sequences outside the ellipse.
Źródło:
Journal of Applied Genetics; 1997, 38, 1; 1-9
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal effects on magnetic hysteresis modeling
Autorzy:
Ladjimi, A.
Mekideche, M.R.
Babouri, A.
Powiązania:
https://bibliotekanauki.pl/articles/140594.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model Jilesa-Athertona
histereza magnetyczna
temperatura
Jiles-Atherton model
magnetic hysteresis
temperature
modeling
Opis:
A temperature dependent model is necessary for the generation of hysteresis loops of ferromagnetic materials. In this study, a physical model based on the Jiles-Atherton model has been developed to study the effect of temperature on the magnetic hysteresis loop. The thermal effects were included through a model of behavior depending on the temperature parameters Ms and k of the Jiles-Atherton model. The temperaturedependent Jiles-Atherton model was validated through measurements made on ferrite material (3F3). The results have been found to be in good agreement with the model.
Źródło:
Archives of Electrical Engineering; 2012, 61, 1; 77-84
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of mineral spray oil, Confidor, Dursban, and Abamectin used for the control of Phyllocnistis citrella (Lepidoptera: Gracillariidae), and an evaluation of the activity of this pest in citrus orchards in northern Iran
Autorzy:
Damavandian, M.R.
Moosavi, S.F.K.
Powiązania:
https://bibliotekanauki.pl/articles/66039.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mineral oil
Confidor pesticide
Dursban pesticide
Abamectin pesticide
pest control
pesticide
Phyllocnistis citrella
citrus leafminer
Lepidoptera
Gracillariidae
citrus orchard
sustainable agriculture
Iran
Opis:
The efficacy of three types of mineral spray oil (MSO), and Abamectin plus MSO to control the citrus leafminer Phyllocnistis citrella Stainton were compared with the conventional broad spectrum pesticides, Confidor, and Dursban, in two citrus orchards in northern Iran. Differences were found among the various concentrations of MSO in the number of mines and live larva per leaf, sampled 5 days after the application of 3 sprays at an interval of 5 days. Mineral spray oil applied at a rate of ≥ 0.65% in water, showed no significant differences when compared with Confidor, and Dursban. Abamectin plus MSO at a rate of 0.02% plus 0.50% in water respectively, provided the highest level of control and reduced the population of larva up to 85%. Generally, a concentration of ≥ 0.65% MSO in water caused a significant damage reduction. However, by reducing the MSO concentration, the rate of control was decreased. In another field experiment conducted in mature citrus orchards, the effect of two pest management types (applying just MSO vs. usage of synthetic pesticides) on the activity of P. citrella, was evaluated. The comparison results indicated that there is more P. citrella damage in orchards under pressure of synthetic pesticides than in orchards in which the synthetic pesticides were eliminated for years.
Źródło:
Journal of Plant Protection Research; 2014, 54, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constitutively active guard cell plasma membrane Hplus-ATPase impairs ozone – elevated CO2־ and darkness-induced stomatal closur
Autorzy:
Nuhkat, M.
Roelfsema, M.R.G.
Kollist, H.
Powiązania:
https://bibliotekanauki.pl/articles/81254.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
air pollutant
plasma membrane
guard cell
ATPase
ozone
reactive oxygen species
stomatal conductance
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Septoria leaf blotch and its control with commercial fungicides, on rbuscular-mycorrhizal-fungal colonization, spore numbers, and morphotype diversity
Autorzy:
Schalamuk, S.
Velazquez, S.
Simon, M.R.
Cabello, M.
Powiązania:
https://bibliotekanauki.pl/articles/65863.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Arbuscular-mycorrhizal internal structures (i.e. total root colonization, arbuscules, vesicles) and external structures (i.e. spore density), and Glomeromycota spore morphotypes, were evaluated in wheat severely infected with Mycosphaerella graminicola - the causal agent of Septoria leaf blotch. Plots in which the infection was controlled with a commercial fungicide at recommended field doses, were also examined. The commercial fungicide used was an admixture of trifloxistrobin and tebuconazole. No negative effects of the fungicide application on arbuscular-mycorrhizal fungi (AMF) were found. The M. graminicola fungicidal treatment actually favoured the formation of arbuscules and AMF spores, as there was a selective increase in the density of spores belonging to the glomoid morphotype. Arbuscular-mycorrhizal fungi have an absolute dependence on the carbon provided by the plant. A severe foliar disease leading to a diminished carbon supply to the roots would generate decreases in carbon availability. Such decreases would strongly affect mycorrhizal associations and development. Furthermore, the change in the green-leaf area produced by a severe foliar disease and/or a reversal of that condition through fungicide treatment could result in shifts in the composition of the AMF community so as to favour glomoid morphotypes. Glomoid species have been previously considered as r-strategists.
Źródło:
Journal of Plant Protection Research; 2014, 54, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Microstructure and Barrier Properties of Silicate Coatings on Low Carbon Steel by Incorporating Colloidal Nano-SiO2
Autorzy:
Majdi, M. R.
Danaee, I.
Zaarei, D.
Farzam, M.
Powiązania:
https://bibliotekanauki.pl/articles/355960.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
colloidal nano-SiO2
silicate coating
corrosion
AFM
ATR-FTIR
Opis:
Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-SiO2 into the film. The characterizations of nano-SiO2 were investigated by FESEM, TEM and FT-IR. The effects of nano contents (weight ratio) and drying temperatures on corrosion properties of silicate film were studied. Potentiodynamic polarization, electrochemical impedance spectroscopy and immersion tests have been used to study corrosion behavior of nano-loaded silicate films. Surface morphology, microstructure and its chemical composition were analyzed by means of FESEM, EDS, AFM, XRD, GIXRD, ATR-FTIR and Raman techniques. Results indicated that colloidal nano-SiO2 properly modified the silicate coatings and significantly improved the corrosion resistance and barrier property. Also drying temperature showed a considerable effect in silicate coating and higher corrosion resistance was obtained with 150°C curing.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 627-638
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 931

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