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Tytuł:
Environmental friendly consumption of scrap tires in eafs to save power and carbon
Przyjazne środowisku wykorzystanie zużytych opon samochodowych w piecu łukowym celem oszczędności energii i węgla
Autorzy:
Joulazadeh, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/264197.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
odpady opon samochodowych
elektryczny piec łukowy
węgiel
koks
energia
scrap tires
EAF
carbon
coke
power
Opis:
World wastes nearly 1.3 billions of tire/year, while Iran wastes 8 millions pieces of tire annually. This study and investigation shows that waste tires can be a substitute for coal & coke in EAF as environmental friendly. In this study Esfahan Steel Company (ESCo) consumed waste tires with 6 Mg capacity EAF. Thirteen grades of steel including Iow, medium & high C content as well as Iow & high alloys were produced during 73 heats. The result was very successful & coke consumption rate reduced from 18 to 0 kg/Mg of steel. Electricity consumption decreased from 448 to 388 kWh/Mg. Stack gas analysis & measuring was done and the achieved results indicate the polluted gases content such as CO, NOX and SO2 is much less than the limited range. Industrial tests continued in Iran Alloy Steel Co. where 20 heats were made in 40 Mg capacity EAF with 30 MVA transformer capacities. The results are as follows: waste tires can be substitute for C in EAF steelmaking & the costs lowered by 5 €/Mg; the use of waste tires for additional chemical energy can further decrease electric energy consumption up to by 10-25%. The average S% in steel products was lower than 0.026; the environment is improved by consumption of waste tires in EAF instead of burying them in landfills. The process is reliable, economic & ecological. The large sized scrap tires like these of graders, mining earth movers, trucks & farm tires can be charged in EAF as whole used tires. Dioxin formation peaks at 200°C and decreases unsymmetrically with increasing temperature. Tires have virtually no Hg.
Rocznie na świecie powstaje 1,3 biliona Mg odpadów z produkcji oraz użytkowania opon, a w samym Iranie około 8 milionów Mg. Na podstawie przeprowadzonych analiz stwierdzono, że gumowe odpady mogą być stosowane zamiast węgla i koksu jako bezpieczny dla środowiska wsad do pieców łukowych. Badania te przeprowadzono w Isfahan Steel Company (Esico) w piecu łukowym o pojemności 6 Mg. Podczas 73 wytopów testowych wyprodukowano 13 gatunków stali o niskiej, średniej oraz wysokiej zawartości węgla, jak również niskostopowe oraz wysokostopowe stale. Uzyskano bardzo obiecujące wyniki: całkowicie ograniczono zużycie węgla (normalne zużycie wynosiło 18 kg/Mg), zmalało zużycie energii z 448 do 288 kWh/Mg, nastąpił znaczny spadek emisji CO, NOX i SO2. Następnie kontynuowano badania w warunkach przemysłowych w Iran Alloy Steel Co. w piecu łukowym o pojemności 40 Mg oraz mocy 30 MVA. Przeprowadzono 20 wytopów i na podstawie uzyskanych wyników stwierdzono, że: odpady gumowe można stosować zamiast węgla w procesach stalowniczych jednocześnie obniżając koszt produkcji Mg stali o 5 €, dodatek odpadów gumowych powoduje zmniejszenie zużycia energii elektrycznej o 10-15%, średnia zawartość siarki w stali podczas tych badań wyniosła mniej niż 0,026%, wykorzystanie odpadów gumowych w procesach stalowniczych jest o wiele bardziej przyjazne dla środowiska, niż tradycyjne metody spalania ich na składowiskach odpadów. W wyniku przeprowadzonych badań można jednoznacznie uznać ten proces za ekonomiczny oraz ekologiczny. Do produkcji stali w EAF można wykorzystać każdy rodzaj odpadów gumowych niezależnie od jego wcześniejszego wykorzystania. Największa ilość dioksyn wydziela się w temperaturze 200°C i potem systematycznie maleje wraz ze wzrostem temperatury.
Źródło:
Metallurgy and Foundry Engineering; 2008, 34, 1; 13-21
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości terapeutyczne i toksyczne preparatów farmaceutycznych zawierających w swoim składzie AL3+
Therapeutic and toxic properties of pharmaceutical preparations containing AL3+
Autorzy:
Umbreit, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/875083.pdf
Data publikacji:
1993
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Źródło:
Roczniki Państwowego Zakładu Higieny; 1993, 44, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of PAOT Tool Kit for Work Improvements in Clinical Nursing
Autorzy:
Jung, M.- H.
Powiązania:
https://bibliotekanauki.pl/articles/90109.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
clinical nursing practice
PAOT
participatory action-oriented training
tool kit
personel pielęgniarski
lista kontrolna
ankietowanie
praktyka
Opis:
The aim of this study was to develop an action checklist for educational training of clinical nurses. The study used qualitative and quantitative methods. Questionnaire items were extracted through in-depth interviews and a questionnaire survey. PASW version 19 and AMOS version 19 were used for data analyses. Reliability and validity were tested with both exploratory and confirmative factor analysis. The levels of the indicators related to goodness-of-fit were acceptable. Thus, a model kit of work improvements in clinical nursing was developed. It comprises 5 domains (16 action points): health promotion (5 action points), work management (3 action points), ergonomic work methods (3 action points), managerial policies and mutual support among staff members (3 action points), and welfare in the work area (2 action points).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 149-158
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information systems in management of polish railway companies of PKP group in aspects of technology and economy
Autorzy:
Rudowski, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/94893.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
managing systems
railway industry
consolidation
virtualization
cloud computing
systemy zarządzania
przemysł kolejowy
konsolidacja
wirtualizacja
przetwarzanie w chmurze
Opis:
Paper presents selected management information systems in the railway industry companies arising from the transformation of the Polish State Railways into PKP Group. Hardware and software solutions used by this systems and benefits of implement them are also pointed out. Takes into account the areas of financial management as well as the areas of operational management, specific for their activities. These issues are presented in the context of technology and economy. It has been proved that the organizational solutions imply the impossibility of efficient use of resources allocated to information systems due to consummate the benefits of consolidation, virtualization and cloud computing is impossible.
Źródło:
Information Systems in Management; 2015, 4, 3; 193-204
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
It main trends and challenges in the core business area of Polish railway companies
Autorzy:
Rudowski, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/95027.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
IT
digital transformation
management of core business
railway
current challenges
Opis:
IT has a number of solutions that increase productivity while lowering costs allowing to improve the effectiveness of business. Using these solutions we can create new operational and commercial processes, including the relations with the environment adapting those processes to the needs of customers. Use of these solutions is a prerequisite for the digital transformation, which allows to obtain advantage over "old style" companies. The aim of the study is to present the necessary conditions and the concept of IT development for Polish railways, which will effectively take advantage of digital transformation for operators and infrastructure managers. This concept takes into account the needs and possibilities of public entities operating in Poland. Author pointed out the need for changes in the field of information technology and organization of railway companies.
Źródło:
Information Systems in Management; 2017, 6, 3; 223-233
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach for study the electrohydrodynamic oscillatory flow through a porous medium in a heating compliant channel
Autorzy:
Haroun, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/1839817.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ oscylacyjny
elektrohydrodynamika
wymiana ciepła
oscillatory flow
electrohydrodynamics
porous medium
heat transfer
compliant channel
Opis:
The governing equations of an electrohydrodynamic oscillatory flow were simplified, using appropriate nondimensional quantities and the conversion relationships between fixed and moving frame coordinates. The obtained system of equations is solved analytically by using the regular perturbation method with a small wave number. In this study, modified non-dimensional quantities were used that made fluid pressure in the resulting equations dependent on both axial and vertical coordinates. The current study is more realistic and general than the previous studies in which the fluid pressure is considered functional only in the axial coordinate. A new approach enabled the author to find an analytical form of fluid pressure while previous studies have not been able to find it but have found only the pressure gradient. Analytical expressions for the stream function, electrical potential function and temperature distribution are obtained. The results show that the electrical potential function decreases by the increase of the Prandtl number, secondary wave amplitude ratio and width of the channel.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 30-44
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Le TNP : un traite devenu permanent
Autorzy:
Labbe, M. H.
Powiązania:
Défense Nationale 1995, nr 8/9, s. 67-72
Data publikacji:
1995
Tematy:
Układ o Nierozprzestrzenianiu Broni Jądrowej (NPT) 1995 r.
Rozbrojenie polityka 1995 r.
Bezpieczeństwo międzynarodowe polityka 1995 r.
Broń jądrowa nierozprzestrzenianie umowy międzynarodowe 1995 r.
Opis:
Perspektywy przedłużenia ważności traktatu o nierozprzestrzenianiu broni jądrowej.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Assessment of coal mining subsidence damage in Soma-Turkey coalfield using fem modelling
Ocena szkód górniczych związanych z osiadaniem gruntu w zagłębiu węglowym Soma w Turcji, z wykorzystaniem metody elementów skończonych
Autorzy:
Deliormanli, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/220146.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
osiadanie gruntu
górnictwo węglowe
metoda elementów skończonych
mining subsidence
coal mining
finite element method (FEM)
Opis:
Soma has mine subsidence problems associated with production. Therefore, property and infrastructure damage will be related with coal-mine subsidence in Soma. In this study, depending on the underground coal mine production method, damage of subsidence on energy line was determined in Soma-Turkey coalfield. Subsidence may still occur in these areas. Therefore, determining subsidence is very important. Finite element methods (FEM) and field measurements were used for determining the parameters of mechanisms. The software, Phase2, used for the numerical modeling was developed by Rockscience Inc. The results obtained from modeling have been found to be compatible with previous studies and hale been compared with actual field observation.
W Somie wystąpiły szkody górnicze związane z osiadaniem gruntu. Dlatego też uszkodzenia własności i infrastruktury badane będą w związku z osiadaniem gruntu. W artykule określono wielkość uszkodzeń linii energetycznej w zagłębiu węglowym Soma (Turcja) w zależności od zastosowanej metody wybierania. Ponieważ nadal ma miejsce osiadanie gruntu, ważne jest określenie jego zasięgu. Wykorzystano metody elementów skończonych raz pomiary terenowe dla określenia mechanizmu osiadania. Oprogramowanie Phase2, wykorzystywane w modelowaniu numerycznym, opracowane zostało przez firmę Rockscience Inc. Następnie wyniki modelowania, zgodne z wynikami wcześniejszych badań, porównane zostały z wynikami pomiarów w terenie.
Źródło:
Archives of Mining Sciences; 2012, 57, 1; 179-192
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arguments of evolutionary ethics
Autorzy:
Nitecki, M H
Powiązania:
https://bibliotekanauki.pl/articles/20759.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
rapprochement
naturalistic fallacy
natural selection
philosophical fallacy
sociobiology
biological war
biological fallacy
evolutionary ethics
Źródło:
Acta Palaeontologica Polonica; 1993, 38, 3-4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk analysis in designing of body armour
Autorzy:
Struszczyk, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/237953.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Tematy:
kamizelka kuloodporna
projektowanie zbroi
analiza ryzyka
bullet-proof vest
armor design
risk analysis
Opis:
Risk analysis is helpful tools in design of body armor, such as: bullet, fragments proof vests. The proper design process requires the nowledge for all aspects connected with construction, selection of raw-materials, consumer needs as well as the performance and safety during the use and storage. The paper will be present the application of risk analysis in designing of modern contractions of body armors. Several aspects should be taken into account The hazards resulted from technological process, election of raw materials, comfort-ability, the lost of performance and safety during the standard use and storage will be presented and evaluated.
Źródło:
Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 66-73
1230-7491
Pojawia się w:
Techniczne Wyroby Włókiennicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization the dynamical parameters of three phase induction motor using genetic algorithm
Autorzy:
Mohammed, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/376222.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
induction motor
genetic algorithm
differential evolution
DE
Opis:
This paper deals with the optimization of the induction motor design with respect to torque as a dynamical parameter. Most studies on the design of an induction motor using optimization techniques are concerned with the minimization of the motor cost and describe the optimization technique that was employed, giving the results of a single (or several) optimal design(s).Procedure includes the relationship between torque of motor and other effects as they occur in an optimal design. The optimization method that was used in this paper is Differential Evolution as genetic algorithm. Optimal results are in picture as curves or in tabula.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 123-128
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analizy systemów transportowych z zastosowaniem modelu pośrednich możliwości i predykcyjnych metod badawczych w procesie dydaktycznym – wybrane problemy
Analyses of transport systems applying the intervening opportunities model and predictive research methods in the process of teaching – selected issues
Autorzy:
Heliak, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/294228.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
analizy transportowe
model pośrednich możliwości
rozwój
transport analysis
intervening opportunities model
development
Opis:
W artykule scharakteryzowano problematykę, jaką realizowano w trakcie procesu dydaktycznego na kierunku gospodarka przestrzenna na Wydziale Architektury Politechniki Wrocławskiej, w ramach przedmiotu „Techniki analiz i prognoz transportowych”. Na przykładzie Łodzi, Opola, Wałbrzycha oraz Wrocławia przedstawiono i zanalizowano wybrane zagadnienia związane z założeniami modelu pośrednich możliwości, wykorzystywanego w modelowym podejściu do zjawisk przestrzennych w miejskich strukturach osadniczych. Przybliżono również eksperyment podjęty i realizowany w procesie dydaktycznym, służący ocenie ruchu miejskiego, wykorzystujący metodę badawczą opracowaną przez prof. Tadeusza Zipsera.
The article characterises selected issues and problems included in the teaching process of the course “Techniques of transport analyses and forecasts” at the studies in Spatial Planning Faculty of Architecture at Wrocław University of Science and Technology. Examples of such as Łódź, Opole, Wałbrzych and Wrocław were used to present and analyse selected issues related to the concept of the intervening opportunities model applied in the model approach to spatial phenomena at urban settlement structures. The course covered also the experiment undertaken to assess the urban traffic applying the research method developed by prof. Tadeusz Zipser.
Źródło:
Architectus; 2016, 3 (47); 85-96
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verilog-A inductor compact model for the efficient simulation of Class-D VCOs
Autorzy:
Fino, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/397955.pdf
Data publikacji:
2016
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
Verilog-A
RF modeling
tapered Inductor
Class D Oscillator
modelowanie RF
cewka indukcyjna
oscylator
Opis:
This paper presents the use of a Verilog-A compact model for integrated spiral inductors, for the simulation of Class-D CMOS oscillators. The model takes into consideration the geometric parameters characterizing the inductor layout, as well as the technological parameters. The accuracy of the model is checked against simulations with ASITIC simulator and limitations of the model are established. The model is integrated into Cadence environment, offering the designer the possibility to efficiently simulate radio frequency blocks considering the non-idealities of both the inductors and the transistors in nanometric technologies. The particular case for a class-D oscillator is illustrated.
Źródło:
International Journal of Microelectronics and Computer Science; 2016, 7, 3; 114-118
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concerning accessibility in the plane
Autorzy:
Proffitt, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/746923.pdf
Data publikacji:
1974
Wydawca:
Polskie Towarzystwo Matematyczne
Opis:
The article contains no abstract
Źródło:
Commentationes Mathematicae; 1974, 17, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved ant colony optimization algorithm and its application to text-independent speaker verification system
Autorzy:
Aghdam, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/91678.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
ant colony
optimization
ant colony optimization
ACO
security
automatic speaker verification
ASV
feature space
Gaussian mixture model universal background model
GMM-UBM
Opis:
With the growing trend toward remote security verification procedures for telephone banking, biometric security measures and similar applications, automatic speaker verification (ASV) has received a lot of attention in recent years. The complexity of ASV system and its verification time depends on the number of feature vectors, their dimensionality, the complexity of the speaker models and the number of speakers. In this paper, we concentrate on optimizing dimensionality of feature space by selecting relevant features. At present there are several methods for feature selection in ASV systems. To improve performance of ASV system we present another method that is based on ant colony optimization (ACO) algorithm. After feature selection phase, feature vectors are applied to a Gaussian mixture model universal background model (GMM-UBM) which is a text-independent speaker verification model. The performance of proposed algorithm is compared to the performance of genetic algorithm on the task of feature selection in TIMIT corpora. The results of experiments indicate that with the optimized feature set, the performance of the ASV system is improved. Moreover, the speed of verification is significantly increased since by use of ACO, number of features is reduced over 80% which consequently decrease the complexity of our ASV system.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 4; 301-315
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some biochemical and nutritional studies on the effect of Panax ginseng powder extract on adult Japanese quails
Autorzy:
Osfor, M. M. H.
Powiązania:
https://bibliotekanauki.pl/articles/1373036.pdf
Data publikacji:
1995
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
glucose
serum
alkaline phosphatase
food
liver function
urea
bilirubin
renal function
albumin
lipid
triacylglycerol
physiological parameter
Japanese quail
nutrition
protein
Panax ginseng
blood biochemistry
amino transferase
cholesterol
biochemical parameter
creatinine
Opis:
The effect of the Panax ginseng powder extract on reproduction, growth, renal and liver functions and some blood biochemical indices of Japanese quails were investigated. Panax ginseng powder extract at 2 mg and 4 mg/bird daily increased egg number per hen, average egg weight and hatchability. It slightly improved the efficiency of feed utilization and increased the levels of serum total protein, alkaline phosphatase and aspartate amino transferase (AST). The extract decreased significantly the levels of albumin, total lipids, triacylglycerols, cholesterol and glucose, and had no effect on body weight and the levels of serum bilirubin, urea and creatinine. This suggests that long term studies should be done on many different biochemical and physiological parameters and laboratory animals.
Źródło:
Polish Journal of Food and Nutrition Sciences; 1995, 04, 2; 73-79
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola paciorkowców mlekowych i pałeczek propionowych w procesie dojrzewania sera typu szwajcarsko-holenderskiego
Role of lactic acid cocci and propionic acid rods in swiss-dutch type cheese ripening process
Autorzy:
Miks-Krajnik, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/825720.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Technologów Żywności
Opis:
Sery dojrzewające typu szwajcarsko-holenderskiego są serami produkowanymi z zastosowaniem paciorkowców fermentacji mlekowej: Lactococcus spp., Leuconostoc spp. oraz pałeczek propionowych Propionibacterium spp. Kultury starterowe oraz środowisko sera dojrzewającego tworzą bardzo złożony, a jednocześnie dynamiczny układ. Procesy biotechnologiczne zachodzące w matrycy sera dojrzewającego w warunkach przemysłowych zależą głównie od stanu fizjologicznego zastosowanych drobnoustrojów. Metabolizm komórek bakterii nadaje kierunek prowadzonym w środowisku przemianom biochemicznym i enzymatycznym, kształtując tym samym pożądane cechy produktu.
Swiss-Dutch type cheeses are produced with the use of lactic acid streptococci: Lactococcus spp., Leuconostoc spp., and propionic acid rods of Propionibacterium spp. Starter cultures and the environment of ripening cheese create a very complex and, at the same time, a dynamic system. Biotechnological processes occurring in the matrix of cheese ripening under the industrial conditions mainly depend on the physiological state of the micro-organisms applied. The metabolism of bacterial cells governs the biochemical and enzymatic changes occurring in the cheese environment, thus, it models the desirable characteristics of the product.
Źródło:
Żywność Nauka Technologia Jakość; 2012, 19, 1
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and finite element contact temperature analysis of friction material’s type effect on a thermal transient behavior of a single-disc dry clutch
Analiza numeryczna i elementów skończonych temperatury styku jako efektu rodzaju materiału trącego i jej wpływ na zachowanie termiczne suchych sprzęgieł jednotarczowych
Autorzy:
Faidh-Allah, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/190080.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dry friction clutch
thermoelastic problem
Friction materials
suche sprzęgło tarciowe
termosprężystość
materiały tarciowe
Opis:
The sliding period is considered a critical period in the lifetime of friction clutches, because most failures occur during this period. High temperatures due to sliding velocity will appear on the contacting surfaces of the friction clutch system (e.g., in single -disc clutch are pressure plate, clutch discs and flywheel). The finite element technique has been developed to investigate the effect of the type of friction material (material properties) on the transient thermoelastic behaviour of a single-disc dry clutch. Two types of friction materials are used in this work: organic and sintered friction materials. Axisymmetric models are developed to simulate a friction clutch system (single disc with two effective sides). The results represent the comparisons between organic and sintered friction discs, behaviours during slipping periods in clutches.
Stan poślizgu tarciowego ze względu na występowanie największej ilości uszkodzeń jest krytycznym stanem pracy sprzęgieł tarciowych. Wysoka temperatura pracy występująca na powierzchniach trących elementów sprzęgieł spowodowana jest poślizgiem (np. w sprzęgłach jednotarczowych na klockach, tarczach i kole zamachowym). Metoda elementów skończonych została wykorzystana do zbadania wpływu rodzaju materiału (właściwości materiału) na zagadnienie termosprężystości w suchych sprzęgłach tarciowych. W pracy wykorzystano dwa rodzaje materiałów tarciowych: organiczny i spiekany. Opracowano osiowosymetryczne modele symulujące sprzęgło tarciowe (pojedyncza tarcza z dwoma okładzinami). Wynikiem pracy jest porównanie cyklów poślizgu pomiędzy dyskami wykonanymi z materiału organicznego oraz spiekanego.
Źródło:
Tribologia; 2017, 271, 1; 35-43
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
E-Smoking Liquids as Precursors for Liquid Nitroesters
Autorzy:
Fettaka, H.
Lefebvre, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/358051.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
E-smoking liquid
nitroesters
nitroglycerin
1,2-propylene glycol dinitrate
brisance test
activation energy
Opis:
Currently, E-smoking cigarettes are widely used and occur within all classes of society. This work investigated the use of E-smoking liquids for the synthesis of Nitroglycerin (NG) and 1,2-Propylene Glycol Dinitrate (PGDN), both considered as nitroester liquid high explosives. Two kinds of E-smoking liquids (10 mL) were investigated: nicotine free and with nicotine (10 mg/mL). Quantitative analysis of the glycerin and propylene glycol (PG) present in the E-smoking liquids was carried out by gas chromatography-mass spectrometry (GCMS), with calculation of the accuracy and precision parameters. The percentage of glycerin was (10-13 wt.%) and percentage of propylene glycol was (40-70 wt.%) The synthesis of pure NG and pure PGDN were performed with laboratory grade glycerin and propylene glycol and compared to the samples obtained from the E-smoking liquid. Differential Scanning Calorimetry (DSC) was used for the determination of the activation energy and the heat of decomposition for each synthesized explosive, using the Ozawa and Kissinger models. The brisance index was assessed by the witness plate test and compared with some conventional explosives (TNT and C4). Finally, the influence of nicotine (less than 2 wt.%) on the synthetic process and the detonic properties of the explosive mixture was studied.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 1; 199-216
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propylene Glycol Dinitrate (PGDN) as an Explosive Taggant
Autorzy:
Fettaka, H.
Lefebvre, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/358168.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
PGDN
taggant
thermal decomposition
vapour pressure
DSC-TGMS
Opis:
Propylene Glycol Dinitrate (PGDN) is a liquid nitrate ester explosive which has been used as a gelatinating agent in some energetic formulations. The aim of the present work was to assess whether PGDN could be used as a detection taggant. The PGDN was synthesized in the laboratory using laboratory grade propylene glycol (PG). The purity of the synthesized PGDN was assessed using gas chromatography-mass spectrometry (GC/MS) and Fourier transform infrared spectroscopy (FTIR). A study of the thermal decomposition of PGDN was carried out using both DSC and thermogravimetry-mass spectrometry analysis (TG/MS) methods. The gases produced during thermal decomposition were identified by mass spectrometry and the influence of the heating rate was investigated. The duality of DSC-TGA was highlighted by studying the complementarity between these two methods. Vapour pressure and enthalpy of vaporisation of PGDN were considered as the foremost taggant characteristics, and were estimated using TGA and taking benzoic acid as the reference. The vapour pressure of PGDN at ambient temperature is 2.54 Pa, therefore the PGDN could be a good candidate as a detection taggant compared to other explosive taggants (Nitroglycerin, EGDN, DMNB and PDCB).
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 3; 627-640
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Total ship operability –review, concept and criteria
Autorzy:
Ghaemi, M. H.
Olszewski, H.
Powiązania:
https://bibliotekanauki.pl/articles/259127.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship operability
operability limitation criteria
safe operation level
Opis:
The ship operability can be understood and analysed in different manners, and its quality is described using different indexes by different authors. Practically, there is no general and widely accepted description of total ship operability in the literature, nor in the rules of classification societies, which would include both seakeeping and manoeuvrability characteristics of a ship, and simultaneously take into account all ship subsystems and, what is most important, comfort and safety of people on board. The aim of this paper is to propose a general definition of total ship operability and name, adjust, describe and justify criteria which should be considered in the ship operability analysis, as well as to provide a relevant algorithm paving the road for further investigation on total ship operability determination.
Źródło:
Polish Maritime Research; 2017, S 1; 74-81
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed priming with selenium improves growth, water relation and antioxidant activity of pot marigold (Calendula officinalis L.) under drought conditions
Autorzy:
Bayat, H.
Aminifard, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/13082686.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2021, 20, 1; 27-36
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple Method for Calculating the Detonation Pressure of Ideal and Non-Ideal Explosives Containing Aluminum and Ammonium Nitrate
Autorzy:
Jafari, M.
Keshavarz, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/357978.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
detonation pressure
ideal explosive
non-ideal explosive
cross-validation
Opis:
A general and simple method has been developed for calculating the detonation pressure of different kinds of ideal and non-ideal explosives containing aluminum (Al) and ammonium nitrate (AN). The new model can be applied to CHNO and CHNOFCl explosives in pure form or as mixtures as well as non-ideal mixed explosives including Al and AN. It can also be used for different plastic bonded explosives (PBXs). There is no need for any prior knowledge about the measured or calculated properties of the explosive. The only data needed are the standard enthalpy of formation and the loading density of the desired explosive. The predicted detonation pressures were compared with other predictive methods and outputs of BKWS-EOS, in both full and partial equilibrium. Different statistical parameters as well as cross validation parameters showed that the new model is precise, accurate, well-defined, and robust for predicting the detonation pressures of CHNOFCl(Al/AN) energetic materials.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 4; 966-983
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermochemical and Performance Properties of NO2-Substituted Borazines as New Energetic Compounds with High Thermodynamic Stability
Autorzy:
Zamani, M.
Keshavarz, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/951505.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
electrostatic potential
enthalpy sublimation
enthalpy formation
density
Opis:
The structural isomers of nitroborazines were optimized at M062X/6-311++G** level of theory. The effects of the NO2 group on the molecular volume, molecular surface area, crystal density, positive, negative and total average potentials, variances, average deviation and electrostatic balance parameter on the molecular surface were considered. In addition, some important thermodynamic properties of these compounds, such as gas phase and condensed phase enthalpies of formation (ΔfH° (g) and ΔfH° (c)), and the enthalpy of sublimation (ΔH° sub), were calculated. It was found that the crystal densities (ρ) are in the range 1.4471.902 g/cm3. These values are slightly smaller than the corresponding values of their carbon analogues (except for the mononitro compounds). Meanwhile, the values of ρ for B-substituted, di- and trinitroborazines are larger than the related N-substituted compounds. The calculated values of ΔH° sub are in the range 20.1-30.4 kcal/mol. The calculated values of ΔfH° (g) and ΔfH° (c) for the B-substituted nitroborazines are more negative than those for the N-substituted ones. The stability sequence of the hydrogen bonded network structures of nitroborazines in the condensed phase is: dinitroborazine > mononitroborazine > trinitroborazine. The detonation pressure and velocity of these compounds were also calculated. Nitroborazines can be introduced as energetic compounds with high thermodynamic stability and relatively low detonation performance.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 3; 363-381
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sonondegradation of organophosphorus pesticides in water
Autorzy:
Dehghani, M. H.
Fadaei, A.
Powiązania:
https://bibliotekanauki.pl/articles/208018.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pesticides
gas chromatography
human organism
sonolysis
ultrasound irradiation
diazinon
malathion
pestycydy
chromatografia gazowa
organizm ludzki
sonoliza
diazynon
malation
promieniowanie ultradźwiękowe
Opis:
Organophosphorus pesticides (OPPs), such as diazinon and malathion, are widely found in water resources. When absorbed by human organisms, OPP s are very toxic mainly because they deactivate acetyl cholinesterase. In the present study, the degradation of diazinon and malathion was investigated. The experiments were conducted for diazinon concentrations of 100, 300, 500 μg/dm3 and malathion concentrations of 200,400,600 μg/ dm3. Sonochemical examination was done using an ultrasonic reactor at 130 kHz and 500 NW for five times, and then the amount of the pesticide in a sample was measured by the gas chromatography with a flame ionization detector (GC-FID).The highest degradation of malathion and diazinon by the sonolysis process occurred at pH 9 and 3, respectively. The study demonstrates that malathion and diazinon could be effectively degraded by ultrasonic irradiation.
Źródło:
Environment Protection Engineering; 2013, 39, 4; 5-14
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facial expression recognition under difficult conditions: A comprehensive study on edge directional texture patterns
Autorzy:
Ahmed, F.
Kabir, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/331105.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
directional ternary pattern
compressed DTP
facial feature descriptor
texture encoding
support vector machine
deskryptor cech
kodowanie struktury
maszyna wektorów wsparcia
Opis:
In recent years, research in automated facial expression recognition has attained significant attention for its potential applicability in human–computer interaction, surveillance systems, animation, and consumer electronics. However, recognition in uncontrolled environments under the presence of illumination and pose variations, low-resolution video, occlusion, and random noise is still a challenging research problem. In this paper, we investigate recognition of facial expression in difficult conditions by means of an effective facial feature descriptor, namely the directional ternary pattern (DTP). Given a face image, the DTP operator describes the facial feature by quantizing the eight-directional edge response values, capturing essential texture properties, such as presence of edges, corners, points, lines, etc. We also present an enhancement of the basic DTP encoding method, namely the compressed DTP (cDTP) that can describe the local texture more effectively with fewer features. The recognition performances of the proposed DTP and cDTP descriptors are evaluated using the Cohn–Kanade (CK) and the Japanese female facial expression (JAFFE) database. In our experiments, we simulate difficult conditions using original database images with lighting variations, low-resolution images obtained by down-sampling the original, and images corrupted with Gaussian noise. In all cases, the proposed method outperforms some of the well-known face feature descriptors.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 399-409
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of square Msplit estimation in determination of vessel position in coastal shipping
Autorzy:
Zienkiewicz, M. H.
Czaplewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/260266.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
robust estimation
maritime navigation
Msplit estimation
positioning
Opis:
The main aim of this paper is to assess the possibility of using non-conventional geodetic estimation methods in maritime navigation. The research subject of this paper concerns robust determination of vessel’s position using a method of parameters estimation in the split functional model (Msplit estimation). The studies performed will help in finding out if and in which situations the application of Msplit estimation as the method for determining vessel’s position is beneficial from the perspective of navigation safety. The results obtained were compared with the results of traditional estimation methods, i.e. least squares method and robust M-estimation.
Źródło:
Polish Maritime Research; 2017, 2; 3-12
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simple and Reliable Method for Predicting the Detonation Velocity of CHNOFCl and Aluminized Explosives
Autorzy:
Keshavarz, M. H.
Zamani, A.
Powiązania:
https://bibliotekanauki.pl/articles/951480.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
decomposition reaction
heat of detonation
detonation velocity
CHNOFClAl explosive
loading density
Opis:
A reliable method is introduced for predicting the detonation velocity of CHNOFClAl explosives through suitable decomposition paths. The predicted decomposition products are used to estimate the heat of detonation (decomposition) and the detonation velocity. For non-ideal aluminized explosives, the Chapman-Jouguet detonation velocities are significantly different from those expected from existing thermodynamic computer codes for equilibrium and steady state calculations. The predicted detonation velocities give more reliable results for CHNO explosives than one of the best available empirical methods over a wide range of loading densities. The new model provides better agreement with respect to experimental values for aluminized explosives than the computed results from the BKWS equation of state using full and partial equilibrium of aluminium.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 1; 13-33
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Example of Robust Free Adjustment of Horizontal Network Covering Detection of Outlying Points
Autorzy:
Zienkiewicz, M. H.
Bałuta, T.
Powiązania:
https://bibliotekanauki.pl/articles/297811.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
free adjustment
robust estimation
Opis:
This paper presents the method of detecting outlying reference points by applying robust free adjustment. The article contains the theoretical basis of the robust free adjustment. Theoretical considerations are supplemented by a numerical example showing the possible practical applications. In this paper is also included example, which presents detecting of reference points contaminated by gross error, in the case of existence gross errors in observation sets.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(3); 179-192
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blank shape optimization on deep drawing of a twin elliptical cup using the reduced basis technique method
Autorzy:
Golshani, M H
Jabbari, A.
Powiązania:
https://bibliotekanauki.pl/articles/957954.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
deep drawing
twin elliptical cup
reduce basic technique
anisotropic
sheet
earring
Opis:
In this project thesis, initial blank shape optimization of a twin elliptical cup to reduce earring phenomenon in anisotropic sheet deep drawing process was studied .The purpose of this study is optimization of initial blank for reduction of the ears height value. The optimization process carried out using finite element method approach, which is coupled with Taguchi design of experiments and reduced basis technique methods. The deep drawing process was simulated in FEM software ABAQUS 6.12. The results of optimization show earring height and, in addition, a number of design variables and time of process can be reduced by using this methods. After optimization process with the proposed method, the maximum reduction of the earring height would be from 21.08 mm to 0.07 mm and also it could be reduced to 0 in some of the directions. The proposed optimization design in this article allows the designers to select the practical basis shapes. This leads to obtain better results at the end of the optimization process, to reduce design variables, and also to prevent repeating the optimization steps for indirect shapes.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 27; 72-77
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content of available Cu, Zn and Mn in soil amended with municipal sewage sludge
Zawartość przyswajalnych form Cu, Zn i Mn w glebie użyźnionej komunalnym osadem ściekowym
Autorzy:
Sienkiewicz, S.
Czarnecka, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/13789.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Municipal sewage sludge is an unavoidable byproduct of the contemporary live and business activities of people. Proper handling and utilization of sewage sludge continue to create serious problems in Poland although this waste product is a source of both organic carbon and macronutrients. The present study has been carried out in order to assess the influence of municipal sewage sludge on the content of available forms of Cu, Zn and Mn in soil. A microplot experiment set up according to the random sub-block method was conducted in 2005-2008. The experiment was established on anthropogenic, humic urban soil developed from loamy sand rich in phosphorus and magnesium, but poor in potassium, and alkaline in reaction. The design of the trials comprised 5 doses of municipal sewage sludge from the £yna Municipal Wastewater Treatment Plant in Olsztyn: 0, 70, 140, 210 and 280 Mg ha–1 of fresh matter. The tests have demonstrated that a dose of sewage sludge had a significant effect on the content of available forms of Cu, Zn and Mn in soil. In alkaline soil, however, the observed increase in the content of available forms of Cu, Zn and Mn was not hazardous to the environment, but could improve the plant nutrition with these elements. It is highly probable that the availability of Cu may increase in the second and third year after the application of sewage sludge. The accumulation of soluble Zn in soil started to decrease in the second year, but did not become significantly limited until four years after sewage sludge application. Sewage sludge raised the amount of soluble manganese in soil during the first three years, but in the final year of the experiment the quantity of soluble Mn in soil did not undergo any significant fluctuations.
Źródło:
Journal of Elementology; 2012, 17, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of lithology and tectonics on the development of the karst landscape in the Dong Van Global Geopark, NE Wietnam
Wpływ litologii i tektoniki na ukształtowanie krajobrazu krasowego Geoparku Dong Van, NE Wietnam
Autorzy:
Doan, M. H.
Gałka, E.
Powiązania:
https://bibliotekanauki.pl/articles/128396.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Geopark Dong Van
rzeźba krasowa
grupy etniczne
rozwój zrównoważony
Dong Van Global Geopark
karst geomorphology
ethnic groups
sustainable development
Opis:
The Dong Van Karst Plateau Geopark is located in the mountainous area of the northern part of Vietnam. It became the 77th member of the Global Geoparks Network in 2010. The Dong Van Karst Plateau Geopark is a unique combination of breathtaking scenery and culture of ethnic groups, with many potential values such as its geoheritage, biological diversity and historical places, which attract many domestic and foreign visitors. Up to 60% of the area of this geopark is covered by karst. Its topography is strongly dissected by deep river gorges with steep slopes, and this area has experienced several deformational phases from the Middle Cambrian/Early Ordovician, to the Cenozoic. These elements contributed to the breathtaking scenery of the Dong Van Karst Plateau Geopark, the first global geopark in Vietnam and the second in South-East Asia.
Geopark Dong Van Karst Plateau położony jest w górzystym rejonie północnej części Wietnamu. W 2010 roku jako 77 geopark dołączył do Światowej Sieci Geoparków (Global Geoparks Network). Geopark Dong Van Karst Plateau cechuje unikalne połączenie wyjątkowych krajobrazów i kultury grup etnicznych, z licznymi potencjalnymi walorami, takimi jak geodziedzictwo, różnorodnością biologiczną i historycznymi miejscami, które przyciągają wielu krajowych i zagranicznych turystów. Obszar krasowy zajmuje 60% geoparku, silnie rozcięty głębokimi przełomami rzek o stromych stokach, został objęty kilkoma fazami deformacyjnymi, trwającymi od środkowego kambru/wczesnego ordowiku do kenozoiku. Te elementy złożyły się na niezwykły krajobraz Geoparku Dong Van Karst Plateau, pierwszego światowego geoparku w Wietnamie i drugiego w południowo-wschodniej Azji.
Źródło:
Geotourism / Geoturystyka; 2017, 3-4 (50-51); I-XIV
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slag; Value added steel industry byproducts
Żużel; wartość dodana odpadu z przemysłu stalowego
Autorzy:
Joulazadeh, M. H.
Joulazadeh, F.
Powiązania:
https://bibliotekanauki.pl/articles/353339.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
proces wielkopiecowy
proces stalowniczy
żużel
Esfahan Steel Co.
utylizacja
cement
izolacja cieplna
rolnictwo
BF
BOF
EAF
slag
ESCo
utilization
insulation
agriculture
Opis:
Slag is a non metallic co-product, produced in the iron (BF) and steelmaking (BOF and EAF) process. Slag has been commonly utilized on a broad scale ever since these processes were first taken into use. Besides economical benefits, environmental requirements will enhance the need for further product development work concerning the properties of slag in the future, in order to observe the principle of sustainable development. Today, one of the important indicators of sustainable steel industry is quantity of slag (production) and its utilization. This paper discuss the utilization of slag in different fields such as cement, heat and sound isolation, filtration, agriculture, tile and glass production and explain some of important researches in last 35 years which done in Esfahan Steel Co. (ESCo) of Iran.
Żużel jest niemetalicznym produktem wytworzonym w procesach wielkopiecowym (BF) i stalowniczym (BOF, EAF). Żużel był powszechnie wykorzystywany na szeroką skalę od początku istnienia tych procesów. Oprócz korzyści ekonomicznych, wymagania środowiskowe zwiększą potrzebę dalszej pracy na rzecz rozwoju produktu, odnośnie własności żużla, w celu przestrzegania zasady zrównoważonego rozwoju. Dzisiaj, jednym z najważniejszych wskaźników zrównoważonego przemysłu stalowego jest ilość żużla (produkcja) i jego wykorzystanie. Niniejszy artykuł omawia wykorzystanie żużla w różnych obszarach, takich jak cement, izolacja cieplna i akustyczna, filtracja, rolnictwo, produkcja płytek ceramicznych i szklanych oraz wyjaśnia kilka ważnych badań w ciągu ostatnich 35 lat, wykonanych w Esfahan Steel Co.(ESCO) w Iranie.
Źródło:
Archives of Metallurgy and Materials; 2010, 55, 4; 1137-1145
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of low ozone concentrations and short exposure times on the mortality of immature stages of the Indian meal moth, Plodiainterpunctella (Lepidoptera: Pyralidae)
Autorzy:
Keivanloo, E.
Namaghi, H.S.
Khodaparast, M.H.H.
Powiązania:
https://bibliotekanauki.pl/articles/66028.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In Iran, the Indian meal moth, Plodia interpunctella (Hübner), is one of the most important pests of such stored products as date fruits and pistachio nuts. Ozone was applied as a gas at four concentrations (0, 2, 3, and 5 ppm) for four different periods (30, 60, 90, and 120 min) on the immature stages of P. interpunctella. The results indicated that by increasing the concentration and exposure time, the rate of mortality increased for all tested stages. This study showed that 12-day-old larvae were more susceptible than other stages when exposed to 5 ppm ozone for 120 min. The next in order of susceptibility were pupae, then 5-day-old larvae, and 17-dayold larvae had the highest sensitivity to ozonation. At the highest concentration of ozone, for the longest time, the least mortality rate was recorded for one-day-old eggs. According to the results, a reduction in the population density of P. interpunctella in laboratory experiments is promising. However, validation studies will be necessary to fully determine the potential of ozone as a replacement for the current post harvest chemical control of P. interpunctella on either pistachio nuts or date fruits.
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:
Optimal point to point path planning of flexible manipulator under large deformation by using harmony search method
Autorzy:
Esfandiar, H.
Korayem, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/280605.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
meta-heuristic optimization
harmony search
large deformation
flexible manipulator
Opis:
This paper aims at planning an optimal point to point path for a flexible manipulator under large deformation. For this purpose, the researchers use a direct method and meta-heuristic optimization process. In this paper, the maximum load carried by the manipulator and the minimum transmission time are taken as objective functions of the optimization process to get optimal path profiles. Kinematic constraints, the maximum velocity and acceleration, the dynamic constraint of the maximum torque applied to the arms and also the constraint of final point accuracy are discussed. For the optimization process, the Harmony Search (HS) method is used. To evaluate the effectiveness of the approach proposed, simulation studies are reviewed by considering a two-link flexible manipulator with the fixed base. The findings indicate that the proposed method is in power of dealing with nonlinear dynamics of the system. Furthermore, the results obtained by rigid, small and large deformation models are compared with each other.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 179-193
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Prospect of Textile Technologies for Medical Devices
Ocena perspektyw technologii włókienniczych wyrobów medycznych
Autorzy:
Struszczyk, M. H.
Olejnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/234260.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
wyroby medyczne
technologie włókiennicze
ubieranie
implanty
medical devices
textile technologies
foresight
dressing
implants
Opis:
This article includes the assessment of fibrous medical devices as well as borderline products from the point of view of expenditures necessary for the realisation of research and implementation in industrial and clinical practices, the range of practice implementation benefits as well as potential barriers restricting studies and implementation. The scale of investment necessary for the realisation of research and implementation in industrial practices in relation to the benefits of implementing them in practice as well as the limitations that restrict the research and implementation of selected fibrous technologies for medical devices are discussed in detail.
W artykule omówiono technologie włókienniczych wyrobów medycznych biorąc pod uwagę poziom koniecznych nakładów na realizację badań oraz wdrożenie rezultatów tych badań, skalę korzyści wdrożenia do praktyki oraz ewentualne, zidentyfikowane zgodnie z obecnym stanem wiedzy, bariery ograniczające procesy badawcze oraz komercjalizacyjne. Oszacowano także obecny stan zaawansowania badań nad włókienniczymi wyrobami medycznymi w kraju i za granicą wraz z próbą oceny stopnia ich gotowości do wdrożenia do praktyki i przewidywanego okresu komercjalizacji.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 6A (95); 28-36
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of axially loaded tapered beams with general end restraints on two-parameter foundation
Autorzy:
Taha, M. H.
Nassar, M.
Powiązania:
https://bibliotekanauki.pl/articles/280518.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
tapered beams
elastic end restraints
two-parameter foundation
differential quadrature method
Opis:
The stability and free vibration of axially-loaded tapered beams with elastic end restraints resting on two-parameter foundations are studied using the differential quadrature method (DQM). The governing differential equation is discretized at sampling points, and then the boundary conditions due to elastic end restraints are implemented and substituted into the governing differential equation yielding a system of homogeneous algebraic equations. The equivalent two-parameter eigenvalue problem is obtained and solved for critical loads in the static case and for natural frequencies in the dynamic case. The obtained solutions are found compatible with those obtained from other techniques. The influences of different parameters on the critical loads and natural frequencies are investigated.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 215-225
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obecne i przyszłe trendy rozwojowe włókienniczych wyrobów balistycznych. Cz. 1
Current and future development trends of textile ballistic products. Part 1
Autorzy:
Struszczyk, M. H.
Olejnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/238157.pdf
Data publikacji:
2011
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Tematy:
ochrona balistyczna
kompozyty balistyczne
opancerzenie balistyczne
włókiennicze wyroby balistyczne
balistic protection
ballistic composites
ballistic armour
ballistic textiles
Opis:
Artykuł analizuje stan obecny oraz oczekiwany popyt na włókiennicze wyroby balistyczne w zakresie ochron osobistych oraz dopancerzeń środków transportów oraz obiektów stałych. Oszacowano także i przeanalizowano dane dotyczące trendów w pracach badawczo-rozwojowych w zakresie projektowania nowoczesnych wyrobów balistycznych. Główny nacisk położono na analizę potencjału rynkowego, bariery oraz trendy w zakresie prac badawczych oraz rozwojowych związanych z włókienniczymi wyrobami balistycznymi w Polsce oraz, w oparciu o dostępne dane, w odniesieniu do zagranicy.
The paper analyses current state and expected demand for textile ballistic products such as individual protection, and add-on armouring for transportation meansand solid object. The data regarding the trends of research and development works were also estimated and analyzed, concerning designing the modern ballistic products. The main focus was put on the analysis of market potential, barriers and trends in the research and development of textile products in Poland, as well as abroad - on a basis of available information.
Źródło:
Techniczne Wyroby Włókiennicze; 2011, 1/2; 20-27
1230-7491
Pojawia się w:
Techniczne Wyroby Włókiennicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obecne i przyszłe zapotrzebowanie rynku na włókiennicze wyroby medyczne
Future market demand for fibrous medical goods
Autorzy:
Struszczyk, M. H.
Olejnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/238174.pdf
Data publikacji:
2010
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Tematy:
tekstylia medyczne
materiały opatrunkowe
implanty medyczne
materiały szewne
podłoże hodowlane
medical textiles
medical dressings
medical implants
tissue engineering scaffolds
suture materials
Opis:
Artykuł omawia obecne i przyszłe trendy rozwojowe oraz zapotrzebowanie rynku polskiego oraz globalnego na włókiennicze wyroby medyczne, min.: opatrunki, w tym opatrunki specjalistyczne, implantowalne wyroby medyczne, materiały szewne. Zakres przeprowadzonej analizy dotyczy także nowatorskich rozwiązań w zakresie włókienniczych wyrobów medycznych, np. podłóż do hodowli tkankowej i komórkowej.
Article discusses current and future trends of development as well as both Polish and global market demand for the fibrous medical goods, i.a.: dressings, including special ones, implantable medical goods, suture materials. The scope of analysis concerns also the innovative solutions among textile medical goods, i.e. substrates for tissue and cell culture.
Źródło:
Techniczne Wyroby Włókiennicze; 2010, R. 18, nr 3/4, 3/4; 19-25
1230-7491
Pojawia się w:
Techniczne Wyroby Włókiennicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antifungal effect of Satureja khuzestanica Jamzad essential oil on oral candidiasis in immunosuppressed rats
Autorzy:
Najibzadeh, T.
Yadegary, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/72688.pdf
Data publikacji:
2018
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
aromatic plant
Satureja khuzestanica
antifungal effect
essential oil
oral candidiasis
rat
immunosuppression
candidiasis
Opis:
The antimicrobial, antibacterial, antioxidant, antihyperlipidaemic, antidiabetic, anti-inflammatory and analgesic effects of Satureja khuzestanica (Lamiaceae) have been investigated in numerous studies. The antifungal effects of S. khuzestanica essential oil (SKJO) in immunosuppressed rats suffering from oral candidiasis were investigated. A fungal suspension with a density of 3×108 CFU/ml was taken from the isolate of a case with acute vaginitis. In order to achieve a medicinal formulation, accurate twice the minimum inhibitory concentration (MIC) of SKJO and 10 times MIC of nystatin was used with 0.8% agar as a base material. In this study, 35 rats divided into 5 groups each of 7 were used. The assessment of level of infection and specification of the effects of treatment were performed using microbiological and histopathological methods as well as clinical examinations. Our results show that carvacrol is the main compound of SKJ essential oil. Lesions completely disappeared in both treatment groups (SKJO and nystatin) after 8 days of treatment. Furthermore, in groups treated with SKJO and nystatin, the quantities of mean logarithm of colony forming unit (CFU) were 85.62% and 90.62%, respectively, in comparison with placebo group. Also, histopathological properties suggested no infection in groups who had clean and normal dorsal tongue mucosa. Using SKJO with twice accuracy it was concluded that MIC in immunosuppressed rats was quite successful in a time of a week and equal with that of a nystatin treatment with an accuracy of 10 times the MIC.
Źródło:
Herba Polonica; 2018, 64, 3
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of constructed wetlands for the treatment of industrial wastewater
Zastosowanie obiektów hydrofitowych do oczyszczania ścieków przemysłowych
Autorzy:
Skrzypiec, K.
Gajewska, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/292531.pdf
Data publikacji:
2017
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
constructed wetlands
industrial wastewater
organic matter
specific pollutants
wastewater treatment
materia organiczna
oczyszczalnie hydrofitowe
oczyszczanie ścieków
ścieki przemysłowe
zanieczyszczenia specyficzne
Opis:
Constructed wetlands are characterized by specific conditions enabling simultaneous various physical and biochemical processes. This is the result of specific environment for the growth of microorganisms and hydrophytes (aquatic and semiaquatic plants) which are capable of living in aerobic, anaerobic and facultative anaerobic conditions. Their interaction contributes to the intensification of oxidation and reduction responsible for the removal and retention of pollutants. These processes are supported by sorption, sedimentation and assimilation. Thanks to these advantages, treatment wetland systems have been used in communal management for over 50 years. In recent years, thanks to its advantages, low operational costs and high removal efficiency, there is growing interest in the use of constructed wetlands for the treatment or pre-treatment of various types of industrial wastewater. The study analyzes current use of these facilities for the treatment of industrial wastewater in the world. The conditions of use and efficiency of pollutants removal from readily and slowly biodegradable wastewater, with special emphasis on specific and characteristic pollutants of particular industries were presented. The use of subsurface horizontal flow beds for the treatment of industrial wastewater, among others from crude oil processing, paper production, food industry including wineries and distillery, olive oil production and coffee processing was described. In Poland constructed wetlands are used for the treatment of sewage and sludge from milk processing in pilot scale or for dewatering of sewage sludge produced in municipal wastewater treatment plant treating domestic sewage with approximately 40% share of wastewater from dairy and fish industry. In all cases, constructed wetlands provided an appropriate level of treatment and in addition the so-called ecosystem service.
W ostatnich latach rośnie zainteresowanie użyciem systemów hydrofitowych do oczyszczania lub wstępnego oczyszczania różnego rodzaju ścieków przemysłowych. W pracy zanalizowano aktualne wykorzystanie tych obiektów do oczyszczania ścieków przemysłowych na świecie. Przedstawiono warunki wykorzystania i skuteczności usuwania zanieczyszczeń łatwo i wolno biodegradowalnych, ze szczególnym naciskiem na zanieczyszczenia specyficzne poszczególnych gałęzi przemysłu. Opisano zastosowanie złóż z poziomym przepływem do oczyszczania ścieków między innymi z przeróbki ropy naftowej, produkcji papieru i przemysłu spożywczego. W Polsce obiekty hydrofitowe są wykorzystywane do oczyszczania ścieków i osadów z przetwórstwa mleka w skali pilotażowej lub do odwadniania osadów ściekowych wytwarzanych w oczyszczalni ścieków komunalnych z udziałem ścieków z przemysłu mleczarskiego i rybnego w wysokości 40%. We wszystkich przypadkach oczyszczalnie hydrofitowe zapewniły odpowiedni poziom usuwania zanieczyszczeń oraz tak zwany ecosystem service.
Źródło:
Journal of Water and Land Development; 2017, 34; 233-240
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of water management on rainfed land in downstream Renggung watershed
Autorzy:
Fahrudin, -
Idris, M. H.
Mahrup, -
Powiązania:
https://bibliotekanauki.pl/articles/1203883.pdf
Data publikacji:
2017
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
rainfed
Renggung watershed
water management
Opis:
The downstream area of Renggung Watershed is a water conservation zone which is also dominated by rainfed land with dominant vertisol soil-clay fraction. Watershed downstream reaches 40% and is 30% of total area of Renggung Watershed. Rainfed farming is a factor in dry land farming, but the presence of rainfed land in downstream Renggung watershed does not receive intensification treatment as water becomes a limiting factor for plant growth. About 87-90% rainfall events in downstream Renggung watershed happen during the rainy season, from November to April, with 3-4 wet months, while about 10-13% happen during the dry season, from May to October. This means that water is abundant in wet months, but there is a shortage of water during the dry period. Based on zone group, 72% of potential water from rainfall occurs in the downstream zone, 18.3% occurs in the middle zone, and 10.4% in the upstream zone. Three quarters of potential water from rainfall occurs in downstream. Water management on rainfed land in downstream Renggung watershed is still not optimum, which is caused by (a) dependence on supply of water downstream from HLD BR, but discharge has declines in the last six months; (b) poor water management at the farming level, because plants are not cultivated in the right season; and (c) poor management institutions and water user groups, so forums to facilitate and mediate issues in terms of management and use of irrigation water is not optimal.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2017, 5, 1; 29-35
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passivity-based optimal control of discrete-time nonlinear systems
Autorzy:
Binazadeh, T.
Shafiei, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/205917.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nonlinear discrete-time systems optimal passivity-based control
genetic optimization algorithm
Opis:
In this paper, a passivity-based optimal controlmethod for a broad class of nonlinear discrete-time systems is proposed. The resulting control law is a static output feedback law which is practically preferred with respect to the state feedback law and is simple to implement. The control law has a general structure with adjustable parameters which are tuned, using an optimization method (genetic algorithm), to minimize an arbitrary cost function. By choosing this cost function it is possible to shape the transient response of the closed-loop system, as it is desirable. An illustrative ex ample shows the effectiveness of the proposed approach.
Źródło:
Control and Cybernetics; 2013, 42, 3; 627-637
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-term air pollution responses to transportation policies in the Tehran Metropolitan Area
Długoterminowe reagowanie na zanieczyszczenia powietrza w politykach transportowych Obszaru Metropolitalnego Teheranu
Autorzy:
Hosseinlou, M. H.
Kabiri, S.
Powiązania:
https://bibliotekanauki.pl/articles/230515.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sieć transportowa
zanieczyszczenie powietrza
zachowania użytkowników
analiza polityki
transportation network
air pollution
user behaviour
policy analysis
Opis:
Transportation networks respond differently to applied policies. The Tehran Metropolitan Area has one of the most complex networks with complex users, which has experienced many of these policies change within the past decades. In this study, some of these policies and their effect on air pollution is investigated. The goal is to pinpoint the variables which have the most effect on various transportation models and investigate how new policies should be focused. In order to do so, long-term variations of air pollution monitoring stations were analyzed. Results show that the most significant parameter that may affect air pollution is users' behavior due to the lack of a public transportation network and its level of comfort. The results of this study will be useful in developing new policies and evaluating their long-term consequences in appropriate models.
Nie można zignorować zależności ludzi od sieci motoryzacyjnych, a tym samym zarządzanie tymi sieciami jest ważnym zadaniem w odpowiedniej eksploatacji tych sieci. Jednak w ostatnich latach szybkość urbanizacji rzeczywiście stworzyła wiele obaw dotyczących warunków zdrowotnych panujących na samej Ziemi i dotyczących ludzi, którzy na niej żyją, a konkretnie zanieczyszczeń powietrza. Takie obawy doprowadziły do stworzenia różnych polityk, które obecnie obowiązują w sieciach transportowych. Jednak sieci transportowe reagują różnie na obowiązujące polityki. Obszar Metropolitalny Teheranu (TMA, Tehran Metropolitan Area) – stolicy Iranu – jest jedną z najbardziej złożonych sieci ze złożonymi użytkownikami, która doświadczyła wielu polityk w ciągu ostatnich dziesięcioleci. Obecny plan, zmieniony prawie dziewiętnaście razy w zakresie obejmującego obszaru, floty i harmonogramu od 1978 roku, głównie ogranicza dostępność samochodów osobowych. Został on wprowadzony w 2004 roku. „Polityka Ograniczenia Ruchu w Dniach Parzystych i Nieparzystych” Odd-Even Day (Odd-Even Day Traffic Restriction Policy, OETRP) i „Polityka Stref Zastrzeżonych” (Restricted Area Policy, RAP) to dwa główne plany obowiązujące obecnie w Centralnej Dzielnicy Biznesowej (Central Business District, CBD). Ponad 40 procent codziennych podróży osób dojeżdżających przesuwa się w kierunku centrum miasta w porannych godzinach szczytu, dlatego większość polityk zarządzania transportem koncentruje się na dzielnicy CBD. Region cierpi zarówno z powodu korków, jak i zanieczyszczenia powietrza na skutek codziennych podróży, z czego to drugie stało się w ostatnich latach centrum wzmożonej uwagi. W niniejszej pracy poddano badaniu niektóre z tych polityk i ich wpływ na zanieczyszczenie powietrza. Celem jest znalezienie tych zmiennych, które mają największy wpływ na konkretne modele transportu i na czym powinny się koncentrować nowe polityki.
Źródło:
Archives of Civil Engineering; 2016, 62, 4/I; 51-71
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving growth indices and productivity of phytochemical compounds in lemon balm (Melissa officinalis L.) through induced polyploidy
Autorzy:
Talei, D.
Fotokian, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/2097129.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
colchicine
flavonoid
lemon balm
physiological traits
rosmarinic acid
Opis:
The induction of polyploidy using mutagenic chemicals is one of the plant breeding methods to enhance the production of secondary metabolites. In the current research, to induce polyploidy in lemon balm (Melissa officinalis) plants, seeds were treated with different concentrations of colchicine for various exposure times. A factorial experiment was performed using a randomized complete block design with two factors: colchicine concentrations with four levels (control, 0.05%, 0.1%, and 0.2%) and exposure times with three levels (24, 48, and 72 h) and three replicates. The physiological and phytochemical traits of plants were measured at a 4–6 leave stage. The results indicated that different concentrations of colchicine had a significant effect on the chlorophyll a (Chl.a), chlorophyll b (Chl.b), carotenoid, phenol, flavonoid, and rosmarinic acid contents. The exposure times of colchicine also caused significant changes in Chl.a, Chl.b, carotenoid, phenol, flavonoid, and rosmarinic acid amounts (P # 0.01). Increasing the colchicine concentration significantly increased the physiological and phytochemical traits at 0.05% and 0.1% concentration in comparison to the control (P # 0.01). In contrast, the interaction of colchicine concentration and exposure time had a significant effect on Chl.a, Chl.b, carotenoid, and rosmarinic acid amounts. The findings of this study indicate that one of the effective methods in primary screening of polyploidy plants in the polyploidization breeding program is the estimation of the physiological changes, the contents of chlorophyll a and b, and the total amount of chlorophyll and secondary metabolites. Flow cytometry is recommended to be used for the accurate identification of the ploidy level in M. officinalis.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 3; 215-226
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feature selection using particle swarm optimization in text categorization
Autorzy:
Aghdam, M. H.
Heidari, S.
Powiązania:
https://bibliotekanauki.pl/articles/91792.pdf
Data publikacji:
2015
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
classification system
feature selection
text categorization
particle swarm optimization (PSO)
system klasyfikacji
wybór funkcji
kategoryzacja tekstu
optymalizacja rojem cząstek
Opis:
Feature selection is the main step in classification systems, a procedure that selects a subset from original features. Feature selection is one of major challenges in text categorization. The high dimensionality of feature space increases the complexity of text categorization process, because it plays a key role in this process. This paper presents a novel feature selection method based on particle swarm optimization to improve the performance of text categorization. Particle swarm optimization inspired by social behavior of fish schooling or bird flocking. The complexity of the proposed method is very low due to application of a simple classifier. The performance of the proposed method is compared with performance of other methods on the Reuters-21578 data set. Experimental results display the superiority of the proposed method.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2015, 5, 4; 231-238
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of filling of the drum on physical properties of granulated multicomponent fertilizer
Autorzy:
Ghasemi, Y.
Kianmehr, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/110226.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
drum granulation
granulation time
filling of the drum
granulation of fertilizer
Opis:
One of the operations in particulate processing which has an ancient history and a widespread use is granulation. Granulated compost fertilizer was granulated using the drum granulation method under different level of drum filling. Filling of the drum ranged from 5 to 10% (v/v). The effect of filling of the drum on some physical properties granulated compost fertilizer including: useful granules, granules size, crush strength, mass of the granules, bulk density, angle of friction and angle of repose are investigated in the present study. Result indicated that with the increasing of drum filling the percentage of useful granules, crush strength, bulk density, angle of friction and angle of repose increase from 64.97% to 78.82%, 34.32 N to 36.69 N, 745.585 kg/m3 to 762.729 kg/m3, 25.56º to 27.93º and 11.38º to 12.52º, respectively. Also the average size of granules decreases from 10.28 mm to 9.45 mm.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 575-587
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of source voltage harmonics on power factor compensation in ac chopper circuits
Autorzy:
Balci, M. E.
Hocaoglu, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/262639.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
harmonics
ac chopper circuits
power factor
reactive power compensation
nonsinusoidal conditions
Opis:
In recent years, the detailed modelling of power electronic devices and their behaviours on various system conditions are a great concern of the power industries and customers. One of the widely proliferated such devices is the triac controlled ac choppers. Although these types of devices have important application areas, their poor power factor is the main obstacle for the large scale implementation in power systems. This paper presents an analysis on the behaviour of a single phase load composed with triac controlled ac chopper during the reactive power compensation with a basic capacitor in nonsinusoidal voltage case. The results of these analysis show that the distortion of voltage improves power factor, which is contradicting with previous findings, for the high conduction angles of triac controlled ac chopper. In addition, it is observed that the performance of power factor improvement with a basic capacitor is noticeably affected by the phase angles of voltage harmonics, which is an extensively ignored issue in the literature.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 53-60
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation with modeling and theoretical predictions of mechanical properties of functionally graded polyethylene/clay nanocomposites
Autorzy:
Yas, M. H.
Khorramabadi, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/949127.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
functionally graded material
nanocomposites
solution technique
melt mixing technique
genetic algorithm theory
Opis:
This paper presents preparation with modeling and theoretical predictions of mechanical properties of compatibilized functionally graded and uniform distribution polyethylene/modified montmorillonite nanocomposites manufactured by solution and melt mixing techniques. The morphology is studied by Scanning Electron Microscopy (SEM) and comparisons are made between two techniques. Young’s modulus of nanocomposites for functionally graded and uniform distributions is calculated using a genetic algorithm and is then compared with the results of other theoretical prediction models mentioned in the literature as well as experimental results. It is found that the melt mixing technique is the preferred preparation method, and the results obtained from the theoretical predictions of genetic algorithm procedure are in good agreement with the experimental ones.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 583-593
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative stochastic frontier analysis of irrigated and rain-fed potato farms in Eastern Ethiopia
Porównawcza analiza stochastyczna gospodarstw z uprawą ziemniaków nawadnianych sztucznie i naturalnie we wschodniej Etiopii
Autorzy:
Melesse, K.A.
Ahmed, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/43324.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Źródło:
Journal of Agribusiness and Rural Development; 2015, 38, 4
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical buckling of functionally graded polyethylene/clay nanocomposites columns based on the Engesser-Timoshenko beam theory
Autorzy:
Yas, M. H.
Khorramabadi, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/949299.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
mechanical buckling
functionally graded nanocomposite
montmorillonite
genetic algorithm theory
Opis:
This paper deals with mechanical buckling of polyethylene/clay nanocomposite beams of functionally graded and uniformly distributed of nanoclay subjected to axial compressive load with simply supported conditions at both ends. The Young moduli of functionally graded and uniformly distributed nanocomposites are calculated using a genetic algorithm procedure and then compared with experimental results. The formulation is modified to include the effect of nanoparticles weight fractions in the calculation of the Young modulus for uniform distribution. Also, it is modified to take into account the Young modulus as a function of the thickness coordinate. The displacement field of the beam is assumed based on the Engesser-Timoshenko beam theory. Applying the Hamilton principle, governing equations are derived. The influence of nanoparticles on the buckling load of the beam is presented. To investigate the accuracy of the present analysis, a compression study with the experimental results is carried out.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 701-712
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A current decomposition-based method for computationally efficient implementation of power resolution meters in non-sinusoidal single-phase systems
Autorzy:
Balci, M. E.
Hocaoglu, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/220775.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power resolutions
non-sinusoidal conditions
single-phase systems
power meter
Opis:
For non-sinusoidal single-phase systems, the classical apparent power has been divided into various components using different techniques. These power resolutions generally aim at to provide a tool for the accurate determination of the maximum power factor achievable with a passive compensator and to measure the load's nonlinearity degree. This paper presents a current decomposition-based methodology that can be employed for computationally efficient implementation of the widely recognized non-sinusoidal power resolutions. The proposed measurement method and the original expressions of the power resolutions are comparatively evaluated by considering their computational complexity. The results show that the proposed method has a significant advantage in terms of computational efficiency for the simultaneous measurements of the powers when compared with the original expressions. Finally, in this paper, a PC-based power meter is developed using the proposed measurement method via the LabVIEW programme.
Źródło:
Metrology and Measurement Systems; 2013, 20, 2; 263-274
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel Technique of Optimization for the COCOMO II Model Parameters using Teaching-Learning-Based Optimization Algorithm
Autorzy:
Khuat, T. T.
Le, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/309064.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
COCOMO II
cost estimation
NASA software
optimization
teaching-learning-based optimization algorithm
Opis:
Software cost estimation is a critical activity in the development life cycle for controlling risks and planning project schedules. Accurate estimation of the cost before the start-up of a project is essential for both the developers and the customers. Therefore, many models were proposed to address this issue, in which COCOMO II has been being widely employed in actual software projects. Good estimation models, such as COCOMO II, can avoid insufficient resources being allocated to a project. However, parameters for estimation formula in this model have not been optimized yet, and so the estimated results are not close to the actual results. In this paper, a novel technique to optimize the coefficients for COCOMO II model by using teaching-learning-based optimization (TLBO) algorithm is proposed. The performance of the model after optimizing parameters was tested on NASA software project dataset. The obtained results indicated that the improvement of parameters provided a better estimation capabilities compared to the original COCOMO II model.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 1; 84-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An observer-based controller design for nonlinear discrete-time switched systems with time-delay and affine parametric uncertainty
Autorzy:
Baleghi, N. A.
Shafiei, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/230013.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete-time switched systems
time-delay
affine parametric uncertainty
observer-based controller
Opis:
This paper proposes a design procedure for observer-based controllers of discrete-time switched systems, in the presence of state’s time-delay, nonlinear terms, arbitrary switching signals, and affine parametric uncertainties. The proposed switched observer and the state-feedback controller are designed simultaneously using a set of linear matrix inequalities (LMIs).The stability analysis is performed based on an appropriate Lyapunov–Krasovskii functional with one switched expression, and in the meantime, the sufficient conditions for observer-based stabilization are developed. These conditions are formulated in the form of a feasibility test of a proposed bilinear matrix inequality (BMI) which is a non-convex problem. To make the problem easy to solve, the BMI is transformed into a set of LMIs using the singular value decomposition of output matrices. An important advantage of the proposed method is that the established sufficient conditions depend only on the upper bound of uncertain parameters. Furthermore, in the proposed method, an admissible upper bound for unknown nonlinear terms of the switched system may be calculated using a simple search algorithm. Finally, the efficiency of the proposed controller and the validity of the theoretical results are illustrated through a simulation example.
Źródło:
Archives of Control Sciences; 2020, 30, 3; 501-521
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Payload Maximization for Mobile Flexible Manipulators in Environment with an Obstacle
Autorzy:
Heidari, H.
Haghpanahi, M.
Korayem, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/279299.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
flexible link
nonholonomic mobile manipulator
optimal control
obstacle
path planning
Opis:
A mobile flexible manipulator is developed in order to achieve high performance requirements such as high-speed operation, increased high payload to mass ratio, less weight, and safer operation due to reduced inertia. Hence, this paper presents a method for finding the Maximum Allowable Dynamic Load (MADL) of geometrically nonlinear flexible link mobile manipulators. The full dynamic model of a wheeled mobile base and the mounted flexible manipulator is considered with respect to dynamics of non-holonomic constraint in environment including an obstacle. In dynamical analysis, an efficient model is employed to describe the treatment of a flexible structure in which both the geometric elastic nonlinearity and the foreshortening effects are considered. Then, a path planning algorithm is developed to find the maximum payload that the optimal strategy is based on the indirect solution to the open-loop optimal control problem. In order to verify the effectiveness of the presented algorithm, several simulation studies are carried out for finding the optimal path between two points in the presence of obstacles. The results clearly show the effect of flexibility and the proposed approach on mobile flexible manipulators.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 911-923
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated region-based segmentation using color components and texture features with prior shape knowledge
Autorzy:
Emambakhsh, M.
Ebrahimnezhad, H.
Sedaaghi, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/908141.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
segmentacja obrazów
zbiór poziomicowy
dyfuzja nieliniowa
minimalizacja energii
image segmentation
prior shape knowledge
level set
nonlinear diffusion
energy minimization
Opis:
Segmentation is the art of partitioning an image into different regions where each one has some degree of uniformity in its feature space. A number of methods have been proposed and blind segmentation is one of them. It uses intrinsic image features, such as pixel intensity, color components and texture. However, some virtues, like poor contrast, noise and occlusion, can weaken the procedure. To overcome them, prior knowledge of the object of interest has to be incorporated in a top-down procedure for segmentation. Consequently, in this work, a novel integrated algorithm is proposed combining bottom-up (blind) and top-down (including shape prior) techniques. First, a color space transformation is performed. Then, an energy function (based on nonlinear diffusion of color components and directional derivatives) is defined. Next, signeddistance functions are generated from different shapes of the object of interest. Finally, a variational framework (based on the level set) is employed to minimize the energy function. The experimental results demonstrate a good performance of the proposed method compared with others and show its robustness in the presence of noise and occlusion. The proposed algorithm is applicable in outdoor and medical image segmentation and also in optical character recognition (OCR).
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 711-726
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of controlled molecular dynamic flow in a channel with non-equal inlet and outlet cross-sectional areas
Autorzy:
Najafi, H. R.
Karimian, S. M. H.
Powiązania:
https://bibliotekanauki.pl/articles/279977.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
molecular dynamics
nano-channel
steady flow
non-equal inlet and outlet
pressure
Opis:
Thermo-fluid properties are required for numerical modeling of nano/micro devices. These properties are mostly obtained from the results of molecular dynamics (MD) simulations. Therefore, efforts have been made to develop methods for numerical evaluation of fluid properties such as pressure and velocity. One of the main challenges faced by numerical simulations is to simulate steady molecular flow in channels with non-equal inlet and outlet boundaries. Currently, periodic boundary conditions at the inlet and outlet boundaries are an inevitable condition in many steady flow molecular dynamics simulations. As a result, a nano-channel with different cross sectional areas at the inlet and outlet could not be simulated easily. Here, a method is presented to generate and control steady molecular flow in a nano-channel with different cross sectional areas at the inlet and outlet. The presented method has been applied to a converging-diverging channel, and its performance has been studied through qualitative and quantitative representation of flow properties.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1141-1153
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of pressure behavior in a temperature controlled molecular dynamic flow
Autorzy:
Najafi, H. R.
Karimian, S. M. H.
Powiązania:
https://bibliotekanauki.pl/articles/280901.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nanofluid
molecular dynamics
pressure
bin size
sampling
periodic flow
Opis:
Thermo-fluid properties are required for numerical modeling of nano/micro devices. These properties are mostly obtained from results of molecular dynamics (MD) simulations. Therefore, efforts have been put in developing methods for numerical evaluation of fluid properties, such as pressure. In this paper, the pressure behavior in a controllable nanochannel flow is investigated. The nanoflow field is created by imposing a gradient of a macroscopic property such as temperature. Details of the pressure calculation method in a molecular system and its sensitivity to the approximations made are described first. The effect of temperature rise in a uniform flow on the pressure field is studied next. Then, in the flow under a fixed mean velocity condition, the effect of temperature gradient as a controllable property on the pressure field of nanoflow is studied. Velocity, pressure and molecular density of nanoflows with various temperature gradients and different temperature levels are investigated as well. It has been found that the temperature level at which the temperature gradient is imposed, is important. A fixed temperature gradient will not always lead to the same pressure gradient at different temperature levels. Furthermore, quite interestingly, it is observed that at a fixed temperature gradient, with the variation of mean velocity the pressure field also varies.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 881-892
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of vasopressin and analogue [d[CH2]1-5, Tyr[Me]2, Val4, delta3Pro7]] AVP on learning and memory in rats chronically treated with ethanol
Autorzy:
Car, H
Borawska, M.H.
Wisniewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/69136.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
learning
ethanol
vasopressin
active avoidance
memory
vasopressin analogue
rat
passive avoidance
Źródło:
Journal of Physiology and Pharmacology; 1994, 45, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent advances in modeling of polymer melt rheology
Postęp w modelowaniu reologii stopionych polimerów
Autorzy:
Wagner, M. H.
Rolón-Garrido, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/947534.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
rheotens
rheology
constitutive equation
Doi-Edwards tube model
MSF model
reologia
równanie konstytutywne
model rurkowy Doi-Edwardsa
model MSF
Opis:
To understand the link between polymerisation of aspecific monomer and the product properties, it is extremely helpful to perform arheological characterization under conditions as close as possible to those occuring in industry. Areliable rheological constitutive equation with as less free parameters as possible is also extremely necessary to reproduce accurately the experimental results obtained for abroad variety of polymer samples at different types of deformations. This allows the establishment of quantitative structure-property relations and permits simulations for specific polymer processes by numerical methods. It is the main objective of the present work to stress the role of rheology in melt processing in the framework of the rheotens experiment, and to give an overview about recent advances in modeling of polymer melt rheology. We discuss grandmastercurves obtained from the rheotens curves, as well as the rupture stress of polymer melts. In the context of rheological constitutive equations, we remind of the limitations of the rubber like-liquid and Doi-Edwards models. The introduction of the interchain tube pressure concept into the molecular stress function (MSF) model is explained. This approach permits to describe quantitatively the transient and steady-state uniaxial viscosities as well as the shear flow response of different nearly monodisperse linear polymers, without any free parameter.
W ocenie zależności między polimeryzacją danego monomeru a właściwościami wytworzonego polimeru, korzystne jest wykorzystanie charakterystyki reologicznej w warunkach możliwie najbardziej zbliżonych do występujących w procesie przemysłowym. Aby szczegółowo odwzorować wyniki badań eksperymentalnych, uzyskane dla różnorodnych próbek polimerów przy różnych typach odkształceń, niezbędny jest dobór odpowiedniego konstytutywnego równania reologicznego z jak najmniejszą liczbą parametrów wolnych. Umożliwia to w konsekwencji określenie ilościowych zależności pomiędzy strukturą a właściwościami polimerów oraz symulację numeryczną specyficznych procesów w przepływach polimerów. Celem pracy jest podkreślenie znaczenia pomiarów reologicznych w badaniach procesów przetwórstwa stopionych polimerów, z wykorzystaniem eksperymentu reometrii rozciągającej typu Rheotens, a także zaprezentowanie ostatnich osiągnięć w dziedzinie modelowania reologii stopionych polimerów. Omówiono ogólne krzywe (grandmastercurves) wyznaczone na podstawie wyników próby typu Rheotens oraz naprężenie zrywające rozciąganych polimerów w stanie stopionym. Wyjaśniono ograniczenia dotyczące modelu cieczy kauczukopodobnej oraz modelu Doi-Edwardsa w odniesieniu do konstytutywnych równań reologicznych. Określono wprowadzenie koncepcji międzyłańcuchowego ciśnienia rurkowego (interchain tube pressure) do modelu funkcji naprężenia molekularnego (MSF). Umożliwiło to dokonanie ilościowego opisu lepkości w przejściowych i ustalonych stanach jednoosiowych oraz ocenę odpowiedzi w przepływie ścinającym, dla różnych polimerów liniowych, w przybliżeniu monodyspersyjnych bez parametrów wolnych.
Źródło:
Polimery; 2015, 60, 10; 603-611
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Cµ2 derived from ultrasonic anemometer in an urban boundary layer
Autorzy:
Al-Jiboori, M.H.
Jaber, S.H.
Powiązania:
https://bibliotekanauki.pl/articles/886365.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2019, 28, 1[83]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro shoot proliferation of Passiflora caerulea L. via cotyledonary node and shoot tip explants
Autorzy:
Jafari, M.
Daneshvar, M.H.
Lotfi, A.
Powiązania:
https://bibliotekanauki.pl/articles/80666.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Passiflora caerulea
shoot proliferation
in vitro
acclimatization
plant growth regulator
regeneration
rooting
shoot explant
shoot multiplication
indole butyric acid
thidiazuron
cytokinin
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2017, 98, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intermolecular Interactions between TNAZ and H2O: a DFT Study
Autorzy:
Oftadeh, M.
Selahvarzi, S.
Keshavarz, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/358486.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
1,3,3-trinitroazetidine (TNAZ)/H2O complex
intermolecular interaction
DFT
natural bond orbital
thermodynamic properties
Opis:
All of the possible TNAZ/H2O complexes (1, 2 and 3), as well as the uncomplexed form, were fully optimized with the density functional method. Complex 3 was the most stable, with the largest corrected intermolecular interaction energy. Charge redistribution mainly occurs on the adjacent N–O...H atoms of the submolecules. Strong hydrogen bonds predominantly contribute to the interaction energies. It is energetically and thermodynamically unfavourable for TNAZ to bind with H2O and to form any stable complexes at room temperature.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 2; 289-300
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of the Condensed Phase Enthalpy of Formation of Nitroaromatic Compounds Using the Estimated Gas Phase Enthalpies of Formation by the PM3 and B3LYP Methods
Autorzy:
Oftadeh, M.
Keshavarz, M. H.
Khodadadi, R.
Powiązania:
https://bibliotekanauki.pl/articles/951504.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
condensed phase enthalpy formation
gas phase enthalpy formation
nitroaromatic compounds
PM3
B3LYP
Opis:
A new method is introduced to correlate the condensed phase enthalpies of formation of nitroaromatic compounds with their gas phase enthalpies of formation on the basis of the B3LYP/6-31G* and PM3 methods. For the B3LYP method, the condensed phase enthalpy of formation depends on the number of certain elements, nitro groups and aromatic rings. For the PM3 method the number of N=N or N≡N groups, and the presence or absence of three interconnected rings, in addition to some of the parameters mentioned above, are necessary in order to obtain a reliable correlation. For 72 nitroaromatic compounds, the calculated root mean square (rms) deviations of the condensed phase enthalpies of formation of nitroaromatic compounds using the B3LYP and PM3 methods are 63.63 and 32.17 kJ/mol, respectively. The results predicted on the basis of the PM3 method are compared with the best available experimental data.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 1; 143-156
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some physiological responses of wheat and bean to soil salinity at low matric suctions
Autorzy:
Khatar, M.
Mohammadi, M.H.
Shekari, F.
Powiązania:
https://bibliotekanauki.pl/articles/24475.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The effect of soil matric suction (2-33 kPa) and salinity (soil solution electrical conductivity 0.7-8 dS m-1 for bean and 2-20 dS m-1 for wheat) on some physiological characteristics of bean and wheat in a clay loam soil under greenhouse condition was investigated. The results showed that the leaf chlorophyll content index and potassium concentration decrease under salinity stress and increase with matric suction from 2 to 33 kPa suction for both plants. The wheat chlorophyll content index declines during the stress spell but bean chlorophyll content index remains nearly constant. The lowest values of the content of soluble sugars and the highest values of leaf proline content are observed at 2 kPa matric suction (highest aeration stress) for bean and wheat. As matric suction increases from 2 to 6 kPa, the soluble sugars increases and proline content decreases significantly and then soluble sugars decreases and proline content increases until 10 kPa suction, and the soluble sugars remains nearly constant at the higher matric suctions for both plants. While the electrical conductivity effect on the soluble sugars is not significant, the values of proline content for both crop increase significantly with electrical conductivity. It was shown that the aeration stress can result in more considerable and rapid physiological responses, in comparison with salinity stress. There is a strong correlation between wheat and bean chlorophyll content index and potassium concentration under salinity and aeration stresses.
Źródło:
International Agrophysics; 2017, 31, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An iterative method for time optimal control of dynamic systems
Autorzy:
Kashiri, N.
Ghasemi, M. H.
Dardel, M.
Powiązania:
https://bibliotekanauki.pl/articles/229435.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic systems
optimal control
time optimal control
bounded control inputs
Opis:
An iterative method for time optimal control of a general type of dynamic systems is proposed, subject to limited control inputs. This method uses the indirect solution of open-loop optimal control problem. The necessary conditions for optimality are derived from Pontryagin's minimum principle and the obtained equations lead to a nonlinear two point boundary value problem (TPBVP). Since there are many difficulties in finding the switching points and in solving the resulted TPBVP, a simple iterative method based on solving the minimum energy solution is proposed. The method does not need finding the switching point so that the resulted TPBVP can be solved by usual algorithms such as shooting and collocation. Also, since the solution of TPBVPs is sensitive to initial guess, a short procedure for making the proper initial guess is introduced. To this end, the accuracy and efficiency of the proposed method is demonstrated using time optimal solution of some systems: harmonic oscillator, robotic arm, double spring-mass problem with coulomb friction and F-8 aircraft.
Źródło:
Archives of Control Sciences; 2011, 21, 1; 5-23
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the service strategy in a queueing system with energy harvesting and customers’ impatience
Autorzy:
Dudin, A.
Lee, M. H.
Dudin, S.
Powiązania:
https://bibliotekanauki.pl/articles/331226.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
energy harvesting
threshold strategy
optimization
Markovian arrival process
uzyskiwanie energii
optymalizacja
Markowski proces zgłoszeń
Opis:
A single-server queueing system with an infinite buffer is considered. The service of a customer is possible only in the presence of at least one unit of energy, and during the service the number of available units decreases by one. New units of energy arrive in the system at random instants of time if the finite buffer for maintenance of energy is not full. Customers are impatient and leave the system without service after a random amount of waiting time. Such a queueing system describes, e.g., the operation of a sensor node which harvests energy necessary for information transmission from the environment. Aiming to minimize the loss of customers due to their impatience (and maximize the throughput of the system), a new strategy of control by providing service is proposed. This strategy suggests that service temporarily stops if the number of customers or units of energy in the system becomes zero. The server is switched off (is in sleep mode) for some time. This time finishes (the server wakes up) if both the number of customers in the buffer and the number of energy units reach some fixed threshold values or when the number of energy units reaches some threshold value and there are customers in the buffer. Arrival flows of customers and energy units are assumed to be described by an independent Markovian arrival process. The service time has a phase-type distribution. The system behavior is described by a multi-dimensional Markov chain. The generator of this Markov chain is derived. The ergodicity condition is presented. Expressions for key performance measures are given. Numerical results illustrating the dependence of a customer’s loss probability on the thresholds defining the discipline of waking up the server are provided. The importance of the account of correlation in arrival processes is numerically illustrated.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 367-378
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New radial velocity studies and curve analysis of spectroscopic binary systems CS22964-161, LV Her, RW Lac and HD 34700
Autorzy:
Ghaderi, K.
Baghadam, M. H.
Rostami, T.
Powiązania:
https://bibliotekanauki.pl/articles/411898.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Stars
binaries
eclipsing – Stars
spectroscopic
Opis:
Using measured radial velocity data of four double-lined spectroscopic binary systems CS22964-161, LV Her, RW Lac and HD 34700, we find corresponding orbital and spectroscopic elements via a Probabilistic Neural Network (PNN). Our numerical results are in good agreement with those obtained by others using more traditional methods.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 1; 9-17
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite-difference solution of parabolic equation and numerical simulation for X-ray focusing
Autorzy:
Elsawy, M. H. R. A.
Leble, S.
Powiązania:
https://bibliotekanauki.pl/articles/1954440.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska
Tematy:
finite difference model
focusing X-rays
Runge-Kutta
Opis:
In this paper we apply the finite-difference method to solve a parabolic equation of a general problem of short wave diffraction in a conducting medium. It is based on the implicit Runge-Kutta method of the second order combined with the iterative procedure. We also present new numerical simulations for X-rays focusing using the mentioned approach. We consider CRLs with a parabolic profile with a radius of curvature up to 0.2 mm. The main goal of this work is to elaborate an X-ray calculator for a PC which would present new possibilities compared to conventional ones. The correspondent code is written in FORTRAN to obtain the focal distance and diffraction spot profiles. Simulations for two cases were performed, the first one with 33 Al lenses for X-ray energy 15 keV, the results showed that we needed to consider more than 50000 points in each direction which forced us to consider a one-dimensional simulation only. For the second case we performed a simulation for several lenses, up to 15 Al lenses to perform the 2-d simulation. We have good agreement with the experimental data for the focal distance, and for the intensity at the focal plane while, for the spot size, we have smaller FWHM for the Gaussian beam at the detector than in the experimental data. We believe that the FWHM we have is smaller as our lenses are ideal without any defects.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 1; 101-111
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obecne i przyszłe trendy rozwojowe włókienniczych wyrobów balistycznych, Cz. 2
Current and future development trends of textile ballistic products. Part 2
Autorzy:
Struszczyk, M. H.
Łandwijt, M.
Olejnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/238154.pdf
Data publikacji:
2011
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Tematy:
ochrona balistyczna
kompozyty balistyczne
opancerzenie balistyczne
włókiennicze wyroby balistyczne
balistic protection
ballistic composites
ballistic armour
ballistic textiles
Opis:
W artykule przeprowadzono ocenę technologii włókienniczych wyrobów balistycznych biorąc pod uwagę (i) skalę koniecznych nakładów na realizację badań i wdrożenia, (ii) skalę korzyści wdrożenia ich do praktyki oraz (iii) ewentualnych barier ograniczających badania i wdrożenie w analizowanym obszarze. Opisano obecny stan zaawansowania badań nad włókienniczymi wyrobami balistycznymi w kraju i za granicą, stopień gotowości do wdrożenia do praktyki oraz prawdopodobne kierunki dalszych badań. Przeprowadzono także analizę prawdopodobnych trendów rozwojowych z uwagi na rosnący popyt, w tym możliwości eksportu polskich technologii innowacyjnych, oraz czynniki stymulujące rozwój badań i wdrażania innowacji. Określono i omówiono sieci powiązań technologii włókienniczych wyrobów balistycznych w analizowanym obszarze technologii i w całym przemyśle włókienniczym (wzajemne zależności i wpływy technologii)
The paper presents an assessment of technologies of textile ballistic products, concerning (i) scale of necessary expenses for realisation of research and implementation, (ii) scale of benefits from introducing them into the practice, and (iii) potential barriers that limit the research and implementation into the scope being analyzed. The current state of advancement of research on the textile ballistic products home and abroad is described, as well as the rate of readiness for introduction into the practice, and probable directions of further research. The analysis of probable development trends was also done, regarding the growing demand, including the possibilities of export of innovative Polish technologies and factors which stimulate development of research and introducing the innovations. The network of relations (mutual dependencies and influences) between technologies of textile ballistic products within the analysed technology area and whole textile industry was determined and discussed.
Źródło:
Techniczne Wyroby Włókiennicze; 2011, 1/2; 27-33
1230-7491
Pojawia się w:
Techniczne Wyroby Włókiennicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of mycorrhizal fungal communities associated with cork oak and understory vegetation by the anthropogenic factors
Autorzy:
Ksentini, H.
Amel, M.-H.
Arifa, B.
Powiązania:
https://bibliotekanauki.pl/articles/28407574.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 3; 184-194
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crossover from BCS to Bose-Einstein in Hubbard Model
Autorzy:
Pedersen, M. H.
Schneider, T.
Beck, H.
Powiązania:
https://bibliotekanauki.pl/articles/1955835.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
71.10.Fd
74.20.-z
71.10.-w
Opis:
We generalize the standard attractive Hubbard, having an on-site pair creation operator Q$\text{}_{i}$ = a$\text{}_{i↑}$a$\text{}_{i↓}$, to one with n components Q$\text{}_{iα}$ = a$\text{}_{iα↑}$a$\text{}_{iα↓}$, α=1,2,...,n. In the limit n → ∞ we obtain the Ginzburg-Landau functional. On this basis we explore the crossover from weak (BCS) to strong coupling (Bose-Einstein condensation) superconductivity. The associated self-consistent equations for the Ginzburg-Landau parameters are similar to those of the T-matrix approach. The evolution of the band structure with increasing interaction strength is studied and correlated with the behavior of the pair propagator and the transition temperature. We find that the pairing interaction creates a new band which moves downwards in energy as the interaction strength increases and separates into a lower Hubbard band when the interaction strength becomes comparable to the band width. In the strong coupling regime, a third band with small spectral weight is also found in between the lower and upper Hubbard bands.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 419-422
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drying kinetics and colour change of lemon slices
Autorzy:
Darvishi, H.
Khoshtaghaza, M.H.
Minaee, S.
Powiązania:
https://bibliotekanauki.pl/articles/24319.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
drying kinetics
colour change
lemon slice
mathematical modelling
drying
temperature
Opis:
The effect of microwave-convective heating on drying characteristics and colour change of lemon slices was investigated. The drying experiments were carried out at 180, 360, 540 and 720Wand at 22°C, with air velocity of 1ms-1. The values of effective moisture diffusivity were found to be in the range between 1.87 10-8 and 3.95 10-8 m2 s-1, and the activation energy was estimated to be 10.91 Wg-1. The drying data were fitted with six mathematical models available in the literature. The model describing drying kinetics of lemon slices in the best way was found. The colour change of the dried lemon slices was analysed and considered as a quality index affecting the drying quality of the product. The values of lightness/darkness, yellowness/blueness and hue angle increased, while the value of redness/greenness decreased with increasing microwave power.
Źródło:
International Agrophysics; 2014, 28, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Berberis vulgaris alleviates Levodopa-induced dyskinesia in male mice
Autorzy:
Mokarian, F.
Famitafreshi, H.
Jahromy, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/71611.pdf
Data publikacji:
2018
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Opis:
Introduction: Parkinson’s disease is a chronic debilitating disease and many patients use Levodopa as a major treatment. However, this drug in long-term use causes a serious condition that is known as Levodopainduced dyskinesia (LID). Berberis vulgaris (BV) has been known to be a good potential medication for neurologic diseases such as movement disorders. The aim of this study is to investigate the usefulness of BV for LID in mice. Material and methods: In this study, 48 adult male mice were randomly divided into six groups: 1) saline group, 2) MPTP + LID, 3) MPTP + LID + BV (5 mg/kg), 4) MPTP + LID + BV (10 mg/kg), 5) MPTP + LID + BV (20 mg/kg). MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) (30 mg/kg/ day/i.p.) was used to induce Parkinson's disease and Levodopa (50 mg/kg/day/i.p.) was used to induce LID. After induction of LID, mice received intraperitoneally (i.p.) different dosages of BV for 25 days. To investigate movement disorder improvement (dyskinesia), AIMS (Abnormal Involuntary Movement Scale) and cylinder tests were used. Results: Mice that received BV at dosages of 10 and 20 mg/kg/day showed improvement in AIMS and the cylinder test. Conclusion: BV is a useful drug for treating LID. So, parkinsonian disease patients may get a beneficial effect after treatment with BV for LID.
Źródło:
Herba Polonica; 2018, 64, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of DDE and dieldrin and their parental substances (DDT and aldrin) on PGE2 and PGF2α release from bovine endometrial explants collected during 120 to 180 days of the gestational period
Autorzy:
Mlynarczuk, J.
Wrobel, M.H.
Dobrzyn, K.
Powiązania:
https://bibliotekanauki.pl/articles/2087240.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pesticides
pregnancy
endometrium
prostaglandin secretion
cattle
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 1; 5-12
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety and Labelling Requirements for Textile Products - Design and Use Aspects
Wymagania bezpieczeństwa i znakowania produktów włókienniczych – aspekty projektowe oraz użytkowe
Autorzy:
Kosińska, B
Czerwiński, K.
Struszczyk, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/233427.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
textile product
safety
labelling
design requirements
wyrób włókienniczy
bezpieczeństwo
oznakowanie
wymagania projektowe
Opis:
This article presents an analysis of changes that have occurred in recent times in legislation relating to the safety and labelling of textile products in connection with the coming into force of harmonised Community regulations relating to products containing textile fibres intended for sale on the EU market, with a presentation of a range of issues which may be the subject of future Community legislation. The article discusses, mainly in terms of design, current safety requirements for textile products and also provides guidance for the design of new textile solutions in relation to the assessment of potential adverse effects on the human body.
Artykuł przedstawia analizę zmian jakie zaistniały w ostatnim czasie w uregulowaniach prawnych związanych z bezpieczeństwem i znakowaniem produktów tekstylnych w związku z wejściem w życie zharmonizowanych przepisów wspólnotowych odnoszących się do wyrobów zawierających włókna tekstylne, a przewidzianych do udostępnienia na rynku Unii Europejskiej. W pracy zaprezentowano zakres zagadnień, które mogą być przedmiotem przyszłych wspólnotowych przepisów. W artykule omówiono, w aspekcie głownie projektowym obecnie funkcjonujące wymagania związane z bezpieczeństwem wyrobów włókienniczych oraz wytyczne w zakresie projektowania nowych rozwiązań włókienniczych także w odniesieniu do oceny potencjalnych i niekorzystnych efektów oddziaływań na organizm człowieka
Źródło:
Fibres & Textiles in Eastern Europe; 2014, 2 (104); 19-24
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infuence of Different Parameters on the TNT-Equivalent of an Explosion
Autorzy:
Simoens, B.
Lefebvre, M. H.
Minami, F.
Powiązania:
https://bibliotekanauki.pl/articles/357938.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
emulsion explosive
cylindrical charge
blast overpressure
blast impulse
Opis:
Emulsion explosives are used in a wide range of applications, amongst which some in closed vessels, where the properties at short range need to be known. A series of tests with spherical charges has been carried out to determine the TNT-equivalent at short range of an explosive emulsion based on both peak overpressure and impulse. Generally, the value is found to be constant over the considered range, with a value of 1 for overpressure and of 0.7 for impulse. In most common applications, explosive charges are not spherical. Experiments with cylindrical charges have been performed to study the infuence of (1) the shape of the charge (length-to-diameter ratio) and (2) the location of initiation (central or at one end). At the considered range, increasing L/D increases the peak overpressure and the impulse perpendicular to the axis, but decreases these effects on the axis. The central initiation causes the largest effects on the centreline. The initiation at one end causes a shift in the location of the peak overpressure, but the highest impulse remains on the centreline.
Źródło:
Central European Journal of Energetic Materials; 2011, 8, 1; 53-67
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Experimental Study of Conducted EMI Mitigation on the LED Driver using Spread Spectrum Technique
Autorzy:
Yanuar, M. H.
Hidayat, R.
Firmansyah, E.
Powiązania:
https://bibliotekanauki.pl/articles/226428.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LED driver
conducted
EMI
luminance
spread spectrum
Opis:
LED driver has the potential to interfere the system of electronic devices if the voltage and current change rapidly. Several previous studies presented various solutions to overcome this problem such as particular converter design, component design, electromagnetic interference (EMI) filters, and spread-spectrum techniques. Compared to other solutions, the spread-spectrum technique is the most potential way to reduce the EMI in LED applications due to its limited cost-size-weight. In this paper, the effectiveness of conducted EMI suppression performance and the evaluation of its effect on LED luminance using spread-spectrum techniques are investigated. Spread-spectrum is applied to the system by modifying the switching frequency by providing disturbances at pin IADJ. The disorder is given in the form of four signals, namely square, filtered-square, triangular, and sine disturbance signals. The highest level of the EMI suppression of about 31.89% is achieved when the LED driver is given 800 mVpp filtered-square waveform. The highest reduction power level occurs at fundamental frequency reference, when it is given 700 mVpp square disruption signal, is about 81.77% reduction. The LED luminance level will reduce by 85.2% when it is given the four waveforms disruption signals. These reductions occur as the switching frequency of the LED driver does not work on a fixed frequency, but it varies in certain bands. LED brightness level has a tendency to generate a constant value of 235 lux when it is given the disruption signals. This disturbance signal causes the dimming function on the system that does not work properly.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 3; 293-299
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Thermally-stable Insensitive High Explosive:N,N′-Bis(1,2,3,4-tetrazol-5-yl)-4,4′-diamino-2,2′,3,3′,5,5′,6,6′-octanitroazobenzene (BTeDAONAB)
Autorzy:
Mousavi, S.
Esmaeilpour, K.
Keshavarz, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/951499.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
synthesis
BTeDAONAB
sensitivity
thermal stability
high explosive
Opis:
A novel high performance explosive compound, N,N′-bis(1,2,3,4-tetrazol5-yl)-4,4′-diamino-2,2′,3,3′,5,5′,6,6′-octanitroazobenzene( BTeDAONAB), is introduced which is a thermally stable, insensitive high explosive. The presence of −NH2, −N=N− groups and the tetrazole ring simultaneously in the BTeDAONAB unit surprisingly increases its thermal stability. For the identification and characterization of BTeDAONAB, different analytical techniques have been used, including melting point, IR, 1H NMR, 13C NMR spectroscopy, elemental analysis, differential thermal analysis (DTA), thermogravimetry (TG), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The sensitivity and detonation properties of BTeDAONAB were compared with 2,4,6-triamino1,3,5-trinitrobenzene (TATB) and N,N′-bis(1,2,4-triazol-3-yl-)-4,4′-diamino2,2′,3,3′,5,5′,6,6′-octanitroazobenzene (BTDAONAB), two well-known, thermally stable, insensitive high explosives, as well as hexanitrostilbene (HNS). These studies show that BTeDAONAB has favorable thermal stability with high performance.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 4; 455-465
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear dynamic analysis of a rectangular plate subjected to accelerated/decelerated moving load
Autorzy:
Mamandi, A.
Mohsenzadeh, R.
Kargarnovin, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/949318.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear dynamic
plate
moving load
accelerated/decelerated motion
Opis:
In this paper, nonlinear dynamical behavior of a rectangular plate traveled by a moving mass as well as an equivalent concentrated force with non-constant velocity is studied. The nonlinear governing coupled partial differential equations (PDEs) of motion are derived by energy method using Hamilton’s principle based on the large deflection theory in conjuncture with the von-Karman strain-displacement relations. Then Galerkin’s method is used to transform the equations of motion into a set of three coupled nonlinear ordinary differential equations (ODEs) which then is solved in a semi-analytical way to get the dynamical response of the plate. Also, by using the Finite Element Method (FEM) with ANSYS software, the obtained results in nonlinear form are verified by FEM results. Then, a parametric study is conducted by changing the size of moving mass/force and the velocity of the traveling mass/force with a constant acceleration/deceleration, and the outcome nonlinear results are compared to the results from linear solution.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 151-166
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The B-Li System. Calorimetric and Theoretical Studies
Układ B-Li. Badania kalorymetryczne i teoretyczne
Autorzy:
Dębski, A.
Braga, M. H.
Gąsior, W.
Powiązania:
https://bibliotekanauki.pl/articles/354959.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase diagrams
thermodynamic and thermochemical properties
ab initio calculations
calorimetry
diagram fazowy
właściwości termodynamiczne
właściwości termochemiczne
badania kalorymetryczne
Opis:
The standard enthalpy of formation of the B78Li22 alloy was measured with the use of the water reaction calorimetric method at 25 °C (298 K). An X-ray diffraction study of the prepared sample was conducted. The obtained diffraction pattern was different from the patterns for the B3Li and B14Li3 phases. The standard enthalpy of formation obtained for the B78Li22 alloy was -39.0 ± 0.7 kJ/mole of atoms. This value corresponds well with the formation enthalpies of the phases from the boron-lithium system. Theoretical calculations of the standard enthalpy of formation were conducted for the B78Li22 alloy and the phases from B-Li system, which were investigated earlier. A discussion of the deviations observed between both sets of data (experimental and calculated) was performed. Additionally, DTA studies were performed for 14 alloys of the concentrations from 40 to 100 at. % of Li.
Standardowa entalpia tworzenia stopu B78Li22 została zmierzona metodą kalorymetrii reakcyjnej wodnej. Próbka stopu po wyżarzaniu była poddana badaniom strukturalnym metodą dyfrakcji promieniowania rentgenowskiego. Uzyskany dyfraktogram jest inny od dyfraktogramów dla faz B3Li ora B14Li3. Zmierzona standardowa entalpia tworzenia stopu B78Li22 wyniosła -39.0 ± 0.7 kJ/mol atomów. Wartość ta dobrze koreluje z entalpią tworzenia faz z układu bor-lit. Przeprowadzone zostały również obliczenia teoretyczne standardowej entalpii tworzenia dla stopu B78Li22 oraz faz z układu B-Li, wcześniej badanych. Zaobserwowane rozbieżności między teoretycznymi i eksperymentalnymi wartościami entalpii tworzenia zostały przedyskutowane. Ponadto, wykonano pomiary DTA dla 14 stopów o stężeniach od 40 do 100 % at. Li.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2513-2520
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of Beauveria bassiana on Brazilian poplar moth Condylorrhiza vestigialis (Lepidoptera: Crambidae)
Autorzy:
Pogetto, M.H.F.
Wilcken, C.F.
Powiązania:
https://bibliotekanauki.pl/articles/66450.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The Brazilian poplar moth is the most important pest of poplar plantations in Brazil. This research evaluated the effect of Beauveria bassiana Bals. (Vuill.) on the mortality and development of Condylorrhiza vestigialis Guen. (Lepidoptera: Crambidae). The aim was to develop alternative methods for management of this pest. The pathogens were sprayed on poplar leaves and consequently, the pathogens reached the caterpillars. Bacillus thuringiensis var. kurstaki Berliner was sprayed as the standard treatment. The spray for the control was distilled water. Both pathogens B. bassiana and B. thuringiensis affected insect development with increase mortality at each stage of the insect cycle, reaching a satisfactory control level. Microbial control of Brazilian poplar moth with B. bassiana is promising. Tests with other strains and species of pathogens, mainly under field conditions, were also encouraging. This is the first report about the action of B. bassiana against C. vestigialis.
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:
Governance structure, corporate restructuring and performance
Struktura zarządzania, restrukturyzacja i wydajność korporacyjna
Autorzy:
Alias, N.
Yaacob, M. H.
Jaffar, N.
Powiązania:
https://bibliotekanauki.pl/articles/406227.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
board structure
ownership structure
asset restructuring
Malaysian firms
struktura zarządu
struktura własności
restrukturyzacja aktywów
firmy malezyjskie
Opis:
The common form of corporate restructuring is the divestitures of firm’s tangible and operating assets such as plant and equipment for several motives. Furthermore, company characteristics and use of divestiture proceeds have also influence corporate performance. This study examines the effects governance structure namely board of directors structure and ownership structure specifically subsequent to completed asset restructuring scheme on firm performance for the period 2004 to 2013 of Malaysian firms.
Wspólną formą restrukturyzacji korporacyjnej jest zbycie aktywów rzeczowych i operacyjnych firmy, takich jak fabryki i urządzenia, dla kilku powodów. Ponadto, na wydajność firmy mają również wpływ cechy przedsiębiorstwa i wykorzystanie wpływów zbycia. W niniejszym badaniu analizuje się strukturę zarządzania ruchomościami, a mianowicie strukturę zarządu i strukturę własności, po zakończeniu procesu restrukturyzacji aktywów w odniesieniu do wydajności malezyjskich firm w okresie od 2004 do 2013 r.
Źródło:
Polish Journal of Management Studies; 2017, 15, 1; 7-14
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some High Nitrogen Derivatives of Nitrotetrazolylimidazole as New High Performance Energetic Compounds
Autorzy:
Zohari, N.
Keshavarz, M. H.
Seyedsadjadi, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/358162.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nitrotetrazolyl-imidazole
high energy material
performance
safety
thermochemical property
Opis:
This work introduces important properties of some new derivatives of nitrotetrazolyl-imidazole as high nitrogen energetic compounds, which are evaluated and discussed using some reliable models. The predicted properties are also compared with 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX). It is shown that some of these compounds can be seen as interesting organic explosives with relatively high performance and low sensitivity, which could be used for important industrial applications. Since some of the new compounds have a relatively good oxygen balance, the calculated specific impulses confirm that these compounds can be considered as suitable oxidizers in solid propellants.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 3; 349-362
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular characterization and phylogenetic analysis of Microsporidia and Cryptosporidium spp. in patients with multiple bowel biopsies from Fars Province, Iran
Autorzy:
Mohammadpour, I.
Bozorg-Ghalati, F.
Motazedian, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/6420.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Microsporidia and Cryptosporidium species are prominent agents of enteritis, capable of causing severe chronic diarrhoea in children, immunocompetent and immunocompromised individuals around the world. It is not possible to identify the parasites at species level solely on the basis of microscopy. The aim of the present study was to identify and characterize the species of Microsporidia and Cryptosporidium in immunocompetent humans with GI disturbances by nested PCR-RFLP, sequencing, and phylogenetic analysis. Fresh frozen and fresh paraffin-embedded biopsy specimens of the duodenum, jejunum, ileum and the cecum of 110 patients were examined. Genomic DNA was extracted from all bowel biopsies. Nested PCR targeting the 18S rRNA gene was performed by restriction endonuclease digestion of the PCR product followed by nucleotide sequencing and phylogenetic analysis. A total of three patients with chronic diarrhoea were positive for Microsporidia and Cryptosporidium spp. Species analysis showed the presence of C. parvum and E. bieneusi in two and one samples, respectively. This is the first PCR confirmation of the presence of E. bieneusi and C. parvum in a bowel biopsy of immunocompetent individuals in Iran. This study revealed that PCR, sequencing, and phylogenetic analysis are very powerful tools for the precise species identification of these pathogens.
Źródło:
Annals of Parasitology; 2016, 62, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of oil and protein content to seed size in cotton(Gossypium hirsutum L., cv. Sahel).
Autorzy:
Pahlavani, M. H.
Miri, A.A.
Kazemi, G.
Powiązania:
https://bibliotekanauki.pl/articles/2199173.pdf
Data publikacji:
2009-06-21
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
cotton
emergence
germination
oil
seed
Opis:
This study was designed to identify the response of oil and protein content to non-heritable variation of seed size in cotton (Gossypium hirsutum L.). The experiment was conducted at Gorgan University of Agricultural Sciences, Gorgan, Iran in 2005. The results showed that germination and emergence increased linearity with seed size and R2 of these relationships were 92 and 89%, respectively. This means that larger seed had higher potential of germination and emergence. Also, there was a strong linear relationship between seed weight and oil content. Seed weight provided a better indication of oil content (R2=0.78) than protein content (R2=0.43). There are no considerable relationship between seed size and protein content of seed...
Źródło:
Plant Breeding and Seed Science; 2009, 59; 53-64
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of ploughing depth on average and instantaneous tractor fuel consumption with three-share disc plough
Autorzy:
Fathollahzadeh, H.
Mobli, H.
Tabatabaie, S.M.H.
Powiązania:
https://bibliotekanauki.pl/articles/26275.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2009, 23, 4; 399-402
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental study of interceptor’s effectiveness on hydrodynamic performance of high-speed planing crafts
Autorzy:
Karimi, M. H.
Seif, M. S.
Abbaspoor, M.
Powiązania:
https://bibliotekanauki.pl/articles/258886.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
interceptors
drag reduction
hydrodynamic quality
planing catamaran
mono-hull
Opis:
Trim control mechanisms such as interceptors and trim flaps have been widely used in recent years in highspeed crafts for ride and trim control. In spite of their extensive application, a few studies investigating the impact of interceptors on planing craft performance, have been published. In the present study, the impact of interceptors on planing crafts hydrodynamic quality is investigated through application of an experimental method. Two scaled-down models of high-speed planing mono-hull and catamaran are tested with and without interceptors in calm water at different heights of the interceptors to investigate the effect of interceptors on drag reduction of the models. The first one is a scaled-down model of 11 m planning mono-hull boat and the test was conducted at the towing tank of Sharif University of Technology, Iran. The second one is a scaled-down model of 18 m planing catamaran boat and the test was conducted at the towing tank of Krylov Shipbuilding Research Institute (KSRI), Russia. The experimental results show a remarkable drag reduction of up to 15% for mono-hull model and up to 12% for catamaran model over the wide speed range of the models.
Źródło:
Polish Maritime Research; 2013, 2; 21-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of GZO/IZO Dual-Layer as an Electron Transport Layer in Dye-Sensitized Solar Cell
Autorzy:
Manzari Tavakoli, M. H.
Ahmadi, M.
Sabet, M.
Powiązania:
https://bibliotekanauki.pl/articles/353232.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual-layer
sol-gel
spin coating
thin film
GIZO
solar cell
Opis:
GZO/IZO semiconductor thin films were prepared on the ITO substrate via sol-gel spin coating method for using in the dye-sensitized solar cells (DSSCs). For this purpose, GZO and IZO thin films were optimized by the percentage of doping gallium and indium in zinc oxide and were studied their electrical, optical and structural properties. After that, the layers with the best performance were selected for use in the DSSCs. The concentration of all solutions for spin coating processes was 0.1 M and zinc oxide has been doped with gallium and indium, with different doping percentages (0, 0.5, 1, 2 and 4 volume percentage). So, by studying the properties of the fabricated thin films, it was found the films with 0.5%GZO and 0.5%IZO have the best performance and hence, the optimized dual-layer (0.5% GZO/0.5% IZO (GIZO)) were prepared and studied their electrical and optical properties. The synthesized optimized dual-layer film was successfully used as the working electrode for dye-sensitized solar cells. The sample with 0.5%IZO shows the 9.1 mA/cm2 short-circuit current density, 0.52 V open circuit voltage, 63% fill factor and 2.98% efficiency.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1609-1614
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and development of a semi-active suspension system for a quarter car model using PI controller
Autorzy:
Siswoyo, H.
Mir-Nasiri, N.
Ali, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/385074.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
semi-active suspension
control
damper
road profile
vibration
Opis:
This paper presents the design and development of a semi-active suspension system for a vehicle. The main idea is to develop a system that is able to damp vibration of the vehicle body while crossing the bumps on the road. This system is modeled for a single wheel assembly and then the laboratory prototype of the complete system has been manufactured. It is used to physically simulate the spring-mass-damper system in vehicle and observe the frequency response to the external disturbances. The developed low-cost smart experimental equipment consists of a motor with offset mass which works as an oscillator to induce vibration, a spring-mass-damper system where the variable damper works as a pneumatic cylinder that allows varying the damping constant (c). Proportional-Integral (PI) controller is used to control the damping properties of the semi-active suspension system automatically. The system is designed in contrast to the most of the available suspension systems in the market that have only passive damping properties. The results of this research demonstrate the efficiency of the developed variable damper-based control system for the vehicle suspension system.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 4; 26-33
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microanalysis study of Al-Amar rock and leaching behavior of its tailings for recovery of gold and silver
Autorzy:
Mahmoud, M. H. H.
Awad, H. M.
Altalhi, T.
Powiązania:
https://bibliotekanauki.pl/articles/109620.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gold
silver
tailings
mineralogy
extraction
thiosulfate
Opis:
Some Saudi gold ores, such as that at Al-Amar mine, suffer from low leaching efficiency using the toxic cyanidation process. Only about 60% of the gold and 26% of the silver in the feed ore can be extracted at 0.2% CN– after 24 h and the rest percentages of these metals remained in leaching residues (tailings). These tailings contained 1.1 ppm Au and 4.3 ppm Ag. Reprocessing of tailings serves both for economic and environmental reasons. A petrography analysis of the mineral constituents indicated that the rock samples consisted primarily of sphalerite, chalcopyrite, pyrite and galena in decreasing order of abundance. An electron probe microanalysis quantitatively showed that gold and silver were finely distributed in the grain boundaries and within sphalerite, chalcopyrite, pyrite, and quartz. The dissemination of gold and silver in these hard minerals may be the main reason for their low recovery by cyanidation. Open air roasting of the tailings can release amounts of the disseminated gold and silver which can be extracted during leaching with the harmless thiosulfate ion S2O32–. After studying the different parameters, we found that the maximum possible extraction of gold and silver from the tailings roasted for 2 h at 400°C reached about 50% at 0.2 M ammonium thiosulfate, 0.3 M ammonium hydroxide, solid–liquid ratio ½ for 24 h. These achievements represent a possible exploitation of the accumulated 1.65 million Mg tailing waste containing significant amounts of gold and silver valued at about $73 million.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 527-537
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 4045

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