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Wyświetlanie 1-100 z 3632
Tytuł:
Main measurement and automation nodes of magnetic nanoparticles heater: student project
Autorzy:
Samchenko, R. P
Powiązania:
https://bibliotekanauki.pl/articles/398155.pdf
Data publikacji:
2014
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
magnetic nanoparticles
magnetic losses measurement
amplitude measurement
current control
induction heater
stepwise resonant frequency change
nanocząstki magnetyczne
straty magnetyczne
pomiar amplitudy
sterowanie prądem
nagrzewnica indukcyjna
zmiana częstotliwości
Opis:
At carrying out the experiments to determine the losses for heating of magnetic nanoparticles (MNP) and composites on their basis, which are commonly used in the cancer treatment, it is necessary to reduce the number of manually regulated processes, e.g.: frequency change and resonance adjustment, alternating magnetic field strength amplitude change, as well as the measurements. In present article structural diagram of device for such purposes with improved automation level is presented and circuit engineering solutions for main measurement and automation nodes are proposed. There is an attempt to perform a purely electronic control of current flowing through the heating solenoid coil to adjust the magnetic field strength applied to the MNP sample without using any additional power electronics components.
Źródło:
International Journal of Microelectronics and Computer Science; 2014, 5, 1; 35-40
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody zaplodnienia in vitro
Autorzy:
Piprek, R P
Powiązania:
https://bibliotekanauki.pl/articles/849955.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Tematy:
choroby czlowieka
nieplodnosc
leczenie
zaplodnienie in vitro
metoda GIFT
zaplodnienie pozaustrojowe
metoda FIVET
naprotechnologia
Źródło:
Wszechświat; 2010, 111, 04-06; 102-105
0043-9592
Pojawia się w:
Wszechświat
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic Force Microscopy Imaging of Membrane Proteins
Autorzy:
Gonçalves, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/1539109.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.14.ep
87.64.Dz
Opis:
Atomic force microscopy is a technique particularly adapted to the study of flat objects. The possibility to use it in an aqueous environment makes it a unique tool in biology, providing high resolution structural information of biological membranes. Here we will review atomic force microscopy advances in the study of membrane protein imaging, covering reconstituted proteins in lipid bilayers, native membranes and reviewing function-related imaging and its outcomes.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 408-411
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw form w podlozu na potencjal redoks i wzrost biomasy Azolla filiculoides Lam
Influence of nitrogen forms on redox potential of the nutrient solution and biomass of Azolla filiculoides Lam
Autorzy:
Bennicelli, R P
Powiązania:
https://bibliotekanauki.pl/articles/1401762.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
paprotka wodna
Azolla filiculoides
sinice
Anabaena
biomasa
wzrost roslin
potencjal wzrostu
wykorzystanie
nawozy zielone
azot
azot azotanowy
potencjal redox
water fern
Cyanoprokaryota
biomass
plant growth
plant use
nitrogen
green fertilizer
nitrate nitrogen
redox potential
Opis:
Azolla filiculoides Lam. jest paprotką wodną współżyjącą z azot-wiążącą sinicą Anabaena, która budzi zainteresowania ze względu na możliwość jej wykorzystania w postaci nawozu zielonego. Azolla stała się obiektem badań na całym świecie. Wiedza na temat fizjologicznych i ekologicznych czynników wpływających na wzrost paproci jest istotna w badaniach przyrodniczych ukierunkowanych na jej praktyczne stosowania. Celem tej pracy było zbadanie w warunkach kontrolowanych wpływu różnych form azotu na jego właściwości oksydoredukcyjne (Eh) i przyrost biomasy Azolli, Stwierdzono, że optymalny zakres potencjału redoks wzrostu Azolli zawiera się w przedziale 550-600 mV, a pobór formy azotu azotanowego w podłożu wydaje się być preferowany przez paprotkę w stosunku do azotu wiązanego z atmosfery prze sinicę Anabaenę.
Azolla filiculoides Lam is a floating water fern. It has the ability to fix atmospheric nitrogen through symbiosis willi blue green algae Anabaena, therefore, il is considered an important potential source of nitrogen as green manure. Azolla stimulated many studies in all over the world. Knowledge of the physiological and ecological factors influencing the growth of the fern is therefore essential in order to enhance the azolla practical application. The greenhouse study described in this paper aimed (o evaluate and quantify the influence of different forms of nitrogen on redox potential (Eh) of the solution and Azolla biomass. An optimal redox potential range for growth of Azolla (550-600 mV) was found, and a privileged uptake of nitrate from nutrient solution versus atmosphere fixed nitrogen was observed.
Źródło:
Acta Agrophysica; 2000, 38; 7-14
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forkhead genes and human disease
Autorzy:
Erickson, R P
Powiązania:
https://bibliotekanauki.pl/articles/2041982.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
human disease
forkhead gene
winged helix domain
Axenfeld-Rieger anomaly
lymphedema-distichia
mesodermal development
Źródło:
Journal of Applied Genetics; 2001, 42, 2; 211-221
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analytical winding size optimization for different conductor shapes
Autorzy:
Wojda, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/140709.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Dowell’s equation
Eddy currents
FEM
inductors
optimization
proximity effect
skin effect
thermal effects
winding losses
Opis:
The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell’s equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.
Źródło:
Archives of Electrical Engineering; 2015, 64, 2; 197-214
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw zlokalizowanego stresu tlenowego w glebie na rozwoj korzeni i czesci nadziemnych kukurydzy [ modelowe badania rizotronowe ]
Effect of localized soil oxygen stress on root and shoot development in maize ( a model rhizotrone study)
Autorzy:
Bennicelli, R P
Powiązania:
https://bibliotekanauki.pl/articles/1628361.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
agrofizyka
gleby
kukurydza
system korzeniowy
wzrost roslin
badania modelowe
badania rizotronowe
dynamika rozwoju
powietrze glebowe
aeracja
stres tlenowy
agrophysics
soil
maize
root system
plant growth
model research
development dynamics
soil air
aeration
oxygen stress
Opis:
The aim of the study was to test the usefulness of split rhizotrone technique to investigate the effect of localized soil anoxia on root and shoot developement, using maize as a test plant. The experiment was performed in 6 split rhizotrons enabling differentiation of soil aeration status in each half of the rhizotron by blowing nitrogen or air through them. The rhizotrone consists of two parts (each 16.6 dm3 in volume) inclined with an angle 60°. Each part is constructed of 1 mm thick stainless steel plate with a glass inner wall for root observation and has dimensions 84 cm x 40.5 cm x 5.0 cm. The rhizotrons were filled in with a brown loess soil material (Eutric Camhisol) from Ap horizon (from Eli/6wka, near Lublin). Maize seedlings with the roots splitted between the rhizotrone halves (eukivars KLG 2210 and DEA) were used in the experiments. Until the stress period the soil moisture tension of 20-80 kPa provided good water and air conditions. At a stage of 8 leaves three treatments were applied for a period of 7 days; an oxic control (P/P), a localized anoxia with 50% of the roots in nitrogen treated part (P/A), and a complete anoxia (A/A) with gas nitrogen in both parts. During the stress period diurnal elongation rates of primary roots (by marking positions of the tips each day) as well as distribution of two indicators of soil oxygenation status with depth viz. of oxygen diffusion rate (ODR) and of redox potential (Eh) in soil were measured. Shoot elongation rates were monitored with a potentiometer attached to the youngest leaf. Microscopic photographs of cross- sections of the caps and of apical meristems of primary roots at 400 magnification were made to show the changes in their anatomy due to anoxia. Chemical analysis of the shoots was performed after the stress period. For each cultivar the experiment was repeated three times. The investigations performed allowed the following conclusions to be drown out: 1. The split rhizotrone was shown to be a useful technique to study behaviour of the primary maize roots under localized anoxia conditions. 2. The ODR and Eh distribution with depth showed deterioration of oxygenation status (drop of ODR from control values above 100 |µg m-2 s-1 to the level 30 µg m-2 s-1, decrease of Eh from control values above 550 mV to the level, 300 mV) due to replacement of the soil air with gaseous nitrogen. 3. Root elongation rates under anoxic conditions (both under complete - A/A, and localized - A/P anoxia) were on the level of about 50% of the controle (P/P) during first 4 days and decreased practically to zero by the end of the stress period. In turn, the oxic part of the rhizotrone combined with localized anoxia treatment of the same plant (P/A) exhibited compensation effect and was characterized by stimulation of the root elongation rate up to 80%. This effect was especially distinct after 2-5 days of the stress duration and then tended to decrease. 4Distribution of the root mass in depth under anoxic treatments was characterized by concentration of about 80% of the root mass within first 10 cm of the soil. 5.Microscopic photographs of the root tips showed, under anoxic conditions, shorter meristematic zone, smaller number of mitosis, beginning of aerenchyma formation and dying of the cells at a distance of 1 mm from the root cap. 6.The shoots responded to applying anoxia to both rhizotrone parts by 20% reduction of the growth rate. 7.Both root and shoot elongation rates were correlated also with the temperature. 8.Oxygen deficiency in soil resulted in an increase of exchangeable manganese, what was reflected by its increased concentration in the maize shoots.
Źródło:
Acta Agrophysica; 1994, 03; 3-72
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekonomiczny cykl życia kolejowych inwestycji infrastrukturalnych
Economical life cycle cost for railway infrastructure investment
Autorzy:
Kozubek R., P.
Powiązania:
https://bibliotekanauki.pl/articles/249654.pdf
Data publikacji:
2008
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
cykl życia inwestycji
inwestycje infrastrukturalne
inwestycje kolejowe
economical life
railway investment
Opis:
Do podstawowych metod oceny efektywności inwestycji rzeczowych, opartych na rachunku dyskontowym, uwzględniajacym zmianę wartości pieniądza w czasie, należą: bieżąca wartość netto (Net Present Value - NPV) oraz wewnętrzna stopa zwrotu (Internal Rate of Return - IRR). Wartości tych miar ewaluacji zależy od wielkości stopy dyskontowej (w przypadku wskaźnika NPV), nakładów inwestycyjnych i innych strumieni kosztów i korzyści generowanych przez inwestycję oraz ich rozłożenie w czasie. Istotne jest więc właściwe uwzględnienie czynnika czasu w rachunku efektywności. Ma on szczególne znaczenie w odniesieniu do inwestycji infrastrukturalnych, w tym również inwestycji w zakresie transportu kolejowego, które charakteryzują się między innymi długim okresem budowy i eksploatacji. Dlatego też przy ocenie efektywności tego typu inwestycji bardzo ważnym zagadnieniem jest sposób określenia długości ekonomicznego cyklu życia inwestycji - okresu przyjętego do obliczeń wskaźników NPV i IRR.
Źródło:
TTS Technika Transportu Szynowego; 2008, 4; 58-63
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koszty operacyjne w rachunku efektywności inwestycji infrastrukturalnych w transporcie kolejowym
The operating costs in calculation of efficiency of rail infrastructure projects
Autorzy:
Kozubek, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/319757.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
koszty operacyjne
inwestycje infrastrukturalne
transport kolejowy
ocena efektywności inwestycji
operating costs
infrastructure investment
rail transport
assessment of effectiveness of investments
Opis:
Artykuł zawiera rozważania dotyczące wytycznych, zaleceń i metodyki szacowania kosztów operacyjnych na potrzeby oceny efektywności inwestycji infrastrukturalnych w transporcie kolejowym. Na tle rozważań teoretycznych przedstawiono zróżnicowane podejścia do szacowania tego strumienia pieniężnego oraz ich wpływ na wskaźniki efektywności finansowej i ekonomicznej inwestycji oraz poziom dofinansowania z funduszy UE.
The paper presents the issues concerning the guidelines and estimation methodology of the operating costs in project appraisal of rail infrastructure investments. On the basis of theoretical deliberations, different approaches to estimating operating costs generated by the project were introduced along with their impact on financial and economic performance indicators and level of EU assistance.
Źródło:
Zeszyty Naukowe. Problemy Transportu i Logistyki / Uniwersytet Szczeciński; 2014, 25; 129-142
1640-6818
Pojawia się w:
Zeszyty Naukowe. Problemy Transportu i Logistyki / Uniwersytet Szczeciński
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some properties of grounding nonuniform sets of modal conjunctions
Autorzy:
Katarzyniak, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/908392.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
czynnik poznawczy
komunikacja semantyczna
koniunkcja
cognitive agent
semantic communication
language grounding
conjunction
modality
artificial cognition
Opis:
A language grounding problem is considered for nonuniform sets of modal conjunctions consisting of conjunctions extended with more than one modal operator of knowledge, belief or possibility. The grounding is considered in the context of semiotic triangles built from language symbols, communicative cognitive agents and external objects. The communicative cognitive agents are assumed to be able to observe external worlds and store the results of observations in internal knowledge bases. It is assumed that the only meaning accessible to these agents and assigned to modal conjunctions can be extracted from these internal knowledge bases. Commonsense requirements are discussed for the phenomenon of grounding nonuniform sets of modal conjunctions and confronted with an original idea of epistemic satisfaction relation used to define proper conditions for language grounding. Theorems are formulated and proved to show that the communicative cognitive agents based on the proposed model of grounding fulfill some commonsense requirements given for processing sets of nonuniform modal conjunctions. The main result is that the communicative cognitive agents considered can be constructed in a way that makes them rational and intentional as regards the processing of modal conjunctions and from the human point of view.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 3; 399-412
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of chemical synthesis of dihydropyrimidine (DHPMS) derivatives by Biginelli Reaction using microwave irradiation and conventional method
Autorzy:
Sonawane, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/411784.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
dihydropyrimidine derivatives
Biginelli reaction
microwave irradiation
conventional method
Opis:
The majority of the drugs on the market today are entirely chemically synthesized in the laboratory. Several scientists had synthesized dihydropyrimidine (DHPMs) derivatives showing a wide spectrum of biological actions as antibacterials, antivirals as well as antitumor agents. This activity is principally due to presence of steriogenic carbon C4 in their structure. The current investigation is comparative study of chemically synthesis of two DHPMs derivatives by Biginelli Reaction using microwave irradiation and conventional method. The synthesis of DHPMs derivative involves a multicomponent reaction (aldehyde derivative, urea /thiourea and 1,3-dicarbonyl compounds) in presence of HCl / NH4Cl as a catalyst. Two derivative viz. 3,4-dihydropyrimidin-2-(1H)-ones and 3,4-dihydropyrimidin-2-(1H)-thiones were synthesized and characterized using IR. The melting points were obtained are 203 °C and 211 °C respectively. Microwave irradiation was easy and gave more yield than conventional method. This study will help to develop easy protocol for the synthesis of many more DHPMs derivative with high yield.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 5; 7-11
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green synthesis of pyrimidine derivative
Autorzy:
Sonawane, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/412470.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
dihydropyrimidine derivatives
Biginelli reaction
Grindstone chemistry
Opis:
The majority of the drugs on the market today are entirely chemically synthesized in the laboratory. Several scientists had synthesized dihydropyrimidine (DHPMs) derivatives showing a wide spectrum of biological actions as antibacterials, antivirals as well as antitumor agents. This activity is principally due to presence of steriogenic carbon C4 in their structure. The current investigation is study and synthesis of dihydropyrimidinones efficiently and in high yields under mild, solvent free and eco-friendly conditions by using “Grindstone Chemistry Technique” catalyzed by CuCl2•2H2O and Conc. HCl. The obtained products have been identified by comparison with spectral data & their melting points. The synthesis of DHPMs derivative involves a multicomponent reaction (aldehyde derivative, urea /thiourea and 1,3-dicarbonyl compounds) in presence of HCl / NH4Cl as a catalyst. 3,4-dihydropyrimidin-2-(1H)-ones was synthesized and characterized using IR. The melting points was obtained 203 °C.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 2; 64-68
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study of Chemical Synthesis of Pyrimidine Derivatives by Using Grindstone Chemistry Technique and Conventional Metod
Autorzy:
Sonawane, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/412505.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
dihydropyrimidine derivatives
Biginelli reaction
Grindstone chemistry
Opis:
The majority of the drugs on the market today are entirely chemically synthesized in the laboratory. Several scientists had synthesized dihydropyrimidine (DHPMs) derivatives showing a wide spectrum of biological actions as antibacterials, antivirals as well as antitumor agents. This activity is principally due to presence of steriogenic carbon C4 in their structure. The current investigation is comparative study of chemically synthesis of two DHPMs derivatives by Biginelli Reaction using conventional method and grindstone chemistry technique. The synthesis of DHPMs derivative involves a multicomponent reaction (aldehyde derivative, urea /thiourea and 1,3-dicarbonyl compounds) in presence of HCl / NH4Cl as a catalyst. Two derivative viz. 3,4-dihydropyrimidin-2-(1H)-ones and 3,4-dihydropyrimidin-2-(1H)-thiones were synthesized and characterized using IR. The melting points were obtained are 208 °C and 210 °C respectively. “Grindstone Chemistry Technique” catalyzed by CuCl2•2H2O and Conc. HCl. gave more yield, solvent free and ecofriendly. The obtained products have been identified by comparison with spectral data & their melting points. This study will help to develop easy protocol for the synthesis of many more DHPMs derivative with high field.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 22-27
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact Resistance of Materials for Guards on Cutting Machine Tools - Requirements in Future European Safety Standards
Autorzy:
Mewes, D.
Trapp, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/952750.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
cutting machine tool
guards
impact tests
sheet metal
vision panels
obrabiarki
blachy
cięcie metali
Opis:
Guards on machine tools are meant to protect operators from injuries caused by tools, workpieces, and fragments hurled out of the machine's working zone. This article presents the impact resistance requirements, which guards according to European safety standards for machine tools must satisfy. Based upon these standards the impact resistance of different guard materials was determined using cylindrical steel projectiles. Polycarbonate proves to be a suitable material for vision panels because of its high energy absorption capacity. The impact resistance of 8-mm thick polycarbonate is roughly equal to that of a 3-mm thick steel sheet Fe P01. The limited ageing stability, however, makes it necessary to protect poycarbonate against cooling lubricants by means of additional panes on both sides.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 507-520
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika procesow oksydoredukcyjnych w pozywce i w osadzie z udzialem Azolla caroliniana Willd
Autorzy:
Stepniewska, Z
Bennicelli, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/1402594.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
ekosystemy wodne
paprotka wodna
azolla karolinska
Azolla caroliniana
Anabaena
strefa korzeniowa
dyfuzja tlenu
wiazanie azotu
potencjal oksydo-redukcyjny
aquatic ecosystem
water fern
root zone
oxygen diffusion
nitrogen binding
redox potential
Źródło:
Acta Agrophysica; 2001, 53; 159-164
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal Incidence of Mite and Infuence of Pesticidal Application on Orchid Flower Production
Autorzy:
Meena, N.K.
Pal, R.
Pant, R.P.
Medhi, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/66510.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Investigations were carried out in 2010 to determine the influence of abiotic factors on the incidence of the two spotted spider mite; Tetranychus urticae Koch and to determine the influence of pesticides on orchid flower production. Initially, in January, the mite population was very low (1.0 mite/10 cm2 leaf area). The population gradually increased and peaked to 22.98 mites/10 cm2 leaf area in the first fortnight of May along with the rise in temperature and sunshine. Then, the population declined to a low level of 3.43 mites/10 cm2 leaf area in the first fortnight of December. Maximum and minimum temperatures had a significant positive correlation and sunshine had a non-significant positive correlation, whereas relative humidity and rainfall had a non-significant negative correlation with the mite population. Infestation of the two spotted spider mite was more severe in untreated conditions in comparison to the treated ones. The difference was due to various abiotic factors and natural pest infestation occurrence which drastically affected the flower quality and yield. In unprotected conditions, the number of flower spikes/plant (1.90±0.44 spikes), number of flowers/spike (7.35±1.04 flowers), spike length (42.59±5.69 cm), flower spike diameter (5.26±0.66 mm), and flower size (6.27±0.86 cm) was very low. In protected conditions, flower quality and yield were superior than in unprotected conditions i.e. number of flower spike/plant (2.92±0.57 spikes), number of flowers/spike (11.78±1.16 flowers), spike length (57.59±7.35 cm), diameter of flower spikes (9.09±1.01 mm), and flower size (6.73±1.16 cm).
Źródło:
Journal of Plant Protection Research; 2013, 53, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Material parameters of antimonides and amorphous materials for modelling the mid-infrared lasers
Autorzy:
Piskorski, Ł.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/175109.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
material parameters
computer simulation
mid-infrared devices
GaSb-based lasers
Opis:
The proper modelling of semiconductor device operation with full complexity of many interrelated physical phenomena taking place within its volume is possible only when the material parameters which appear in each part of the self-consistent model are known. Therefore, it is necessary to include in calculations the material composition, temperature, carrier concentration, and wavelength dependences in electrical, thermal, recombination and optical models. In this work we present a complete set of material parameters which we obtained basing mostly on the experimental data found in several dozen publications. To refine the number of equations, we restrict the material list to those which are typically used in edge-emitting lasers and vertical-cavity surface-emitting lasers designed for mid-infrared emission.
Źródło:
Optica Applicata; 2016, 46, 2; 227-240
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement Precision Under Repeatability Conditions of a Batch of Sound Power Assessment for Blenders in Reverberation Room
Autorzy:
Costa-Felix, R. P. B.
Powiązania:
https://bibliotekanauki.pl/articles/177133.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metrology
measurement precision
sound power assessment
reverberation room
Opis:
A set of sound power assessments was performed to determine measurement precision in specified conditions by the comparison method in a reverberation room with a fixed position array of six microphones. Six blenders (or mixers) and, complementary, a reference sound source were the noise sources. Five or six sound power calculations were undertaken on each noise source, and the standard deviation (sr) was computed as “measurement precision under repeatability conditions” for each octave band from 125 Hz to 8 kHz, and in dB(A). With the results obtained, values of sr equal 1.0 dB for 125 Hz and 250 Hz, 0.8 dB for 500 Hz to 2 kHz, and 0.5 dB for 4 kHz and 8 kHz. Those can be considered representative as sound power precision for blenders according to the measurement method used. The standard deviation of repeatability for the A-weighted sound power level equals 0.6 dB. This paper could be used for house or laboratory tests to check where their uncertainty assessment for sound power determination is similar or not to those generated at the National Metrology Institute.
Źródło:
Archives of Acoustics; 2016, 41, 3; 591-597
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaInNAs quantum-well vertical-cavity surface-emitting lasers emitting at 2.33 μm
Autorzy:
Piskorski, Ł.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/199958.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation of a diode-laser operation
QW VCSELs
mid-infrared radiation
dilute nitrides
Opis:
In the present paper, the comprehensive fully self-consistent optical-electrical-thermal-recombination model is used to determine the optimal structure of the possible GaInNAs quantum-well (QW) tunnel-junction (TJ) vertical-cavity surface-emitting lasers (VCSELs) with single-fundamental-mode operation at 2.33 μm wavelength suited for carbon monoxide sensing applications. From among various considered structures, the diode laser with 4-μm TJ and two 6-nm Ga0.15In0.85N0.015As0.985/Ga0.327In0.673As0.71P0.29 QWs has the lowest threshold current and seems to be optimal for the above applications. Higher threshold currents are obtained for Ga0.15In0.85N0.015As0.985/Al0.138 -Ga0.332In0.530As QW structures but the latter can be grown in reactors without P source which are used for fabrication of GaAs-based devices. Both the modelled VCSELs offer a very promising room temperature continuous wave performance and may represent an alternative choice to GaSb-based lasers.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 737-744
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-synchronization in different new chaotic systems via active nonlinear control
Autorzy:
Khan, A.
Prasad, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/229711.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
new chaotic system
anti-synchronization
active nonlinear control
Opis:
In this paper, we discuss anti-synchronization between two identical new chaotic systems and anti-synchronization between another two identical new chaotic systems by active nonlinear control. The sufficient conditions for achieving the anti-synchronization of two new chaotic systems are derived based on Lyapunov stability theory. Numerical simulations are provided for illustration and verification of the proposed method.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 229-242
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The chemistry and synthesis of 1H-indole-2,3-dione (Isatin) and its derivatives
Autorzy:
Sonawane, R.P.
Tripathi, R.R.
Powiązania:
https://bibliotekanauki.pl/articles/411536.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
indole
isatin
NBS-DMSO
Pfitzinger reaction
5-nitro-1H-indole-2,3-dione
2-methylquinoline-4-carboxylic acid
Opis:
Isatins are synthetically versatile substrates, where they can be used for the synthesis of a large variety of heterocyclic compounds. In this, a convenient method has been developed for the conversion of Indoles into Isatins and some heterocyclic derivative were synthesised such as 5- nitro-1H-indole-2,3-dione, 2-methylquinoline-4-carboxylic acid which may be used as raw material for drug synthesis. The general process utilizes the effective method for synthesis of Isatin from Indole is bromination and oxidation with an N-bromosuccinimide-dimethyl sulfoxide reagent. The nitration of Isatin at C-5 takes place by using KNO3, conc. H2SO4, 2-methylquinoline-4-caboxylic acid are usually obtained from pfitzinger reaction.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 30-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extraction of the Isatin from the Couroupita Guianesis (cannon ball tree) and A novel synthesis of the N,N'-(2-oxo-3'H-spiro[indoline-3,2'-[1,3,4]thiadiazole]-3',5'-diyl]diacetamide from the Isatin
Autorzy:
Tripathi, R. R.
Sonawane, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/412432.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Couroupita guianesis
Isatin
thiosemicarbazone
Opis:
Isatins are synthetically versatile substrates, where they can be used for the synthesis of a large variety of Isatins and heterocyclic compounds. In this, the isatin were extracted from the floral material of Couroupita guianesis commonly known as an Cannon ball tree. After that, a novel heterocyclic spiro derivative having an IUPAC name N,N’-(2-oxo-3’H-spiro[indoline-3,2’-[1,3,4] thiadiazole]-3’5’-diyl)diacetamide were synthesized , which may be used as raw material for drug synthesis. A spiro compound N,N’-(2-oxo-3’H-spiro[indoline-3,2’-[1,3,4] thiadiazole]-3’5’-diyl)diacetamide were synthesise by refluxing Isatin And thiosemicarbazone in ethanol and then on heating with acetic anhydride underwent to cyclization into intermediate that on acetylation of the NH and NH2 groups afforded the spiro compound.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 119-125
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Type of Semi-Insulating Materials
Autorzy:
Leon, R. P.
Weber, E. R.
Powiązania:
https://bibliotekanauki.pl/articles/1921578.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
Opis:
The introduction of Cu in InP at 700°C and higher temperatures results in both initially p-type and n-type InP become semi-insulating. It is also observed that thermally stable In-Cu rich precipitates form, that the concentration of deep levels is negligible and that InP:Cu samples exhibit inhomogeneities and anomalous transport behavior. The buried Schottky barrier model is the only model thus far studied which is consistent with these experimental observations. This model has general applicability, and its possible relevance to other semiconductors is examined. The conditions necessary for forming quasi-intrinsic semiconductors by metallic precipitation are discussed.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 664-669
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CardS4: modal theorem proving on Java smart cards
Autorzy:
Gore, R.P.
Nguyen, P.T.
Powiązania:
https://bibliotekanauki.pl/articles/309413.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
bezpieczeństwo
kod
kryptografia
security of mobile code
modal deduction
Opis:
We describe a successful implementation of a theorem prover for modal logic S4 that runs on a Java smart card with only 512 KBytes of RAM and 32 KBytes of EEPROM. Since proof search in S4 can lead to infinite branches, this is "proof of principle" that non-trivial modal deduction is feasible even on current Java cards. We hope to use this prover as the basis of an on-board security manager for restricting the flow of "secrets" between multiple applets residing on the same card, although much work needs to be done to design the appropriate modal logics of "permission" and "obligations". Such security concerns are the major impediments to the commercial deployment of multi-application smart cards.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 4; 68-80
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gender Difference and Emotional Intelligence in Selected Hospitals - A Study
Autorzy:
Sahu, Tapas Lata
Das, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/1192719.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Emotional Intelligence
Gender Difference
Male and Female Employees
Healthcare Organization
Opis:
Emotions in humans are subjective conscious experience characterized by psycho-physiological expressions and behavioral reactions. It may act as tool, if positively identified by complementing and enriching job performance but if negatively understood can ruin feelings and be a disaster. Emotions in healthcare organizations are important to be taken care of because in the service exchange process emotions of both the service provider and the receiver are directly involved. Although caring and curing patient by these employees is a professional activity but still, the empathetic and sympathetic behavior shown by these professionals influences their performance and success in hospital industry. Moreover, the behavior shown by these employees in the workplace is often discriminated on the basis of their gender as it influences the performance of health professionals. Based on above backdrop, the objective of the current study is to assess whether there exist difference in emotional intelligence of healthcare employees in hospitals with respect to their gender. A standardized questionnaire was used to conduct the study among 300 employees in hospitals with the help of scale developed by Hyde, Pethe and Dhar (2002). Data was analyzed through SPSS and results indicated that the level of emotional intelligence among females is higher than male employees.
Źródło:
World Scientific News; 2016, 59; 1-11
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Foil Winding Resistance and Power Loss in Individual Layers of Inductors
Autorzy:
Kazimierczuk, M. K.
Wojda, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/226776.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
eddy currents
individual layer winding resistance
inductors
optimal foil thickness
proximity effect
skin effect
winding power loss
Opis:
This paper presents an estimation of high-frequency winding resistance and power loss in individual inductor layers made of foil, taking into account the skin and proximity effects. Approximated equations for power loss in each layer are given and the optimal values of foil thickness for each layer are derived. It is shown that the winding resistance of individual layers significantly increases with the operating frequency and the layer number, counting from the center of an inductor. The winding resistance of each foil layer exhibits a minimum value at an optimal layer thickness. The total winding resistance increases with the total number of layers.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 3; 237-246
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of a semiconductor disk laser
Autorzy:
Sokół, A. K.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/174528.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
semiconductor disk laser
SDL
vertical-external-cavity surface-emitting laser
VECSEL
computer simulation
numerical modelling
Opis:
In this paper we describe the numerical model of a semiconductor disk laser, developed and implemented in the Photonics Group, Institute of Physics, Lodz University of Technology, Poland. It consists of four strongly interrelated components for: carrier transport, heat flow, material gain and optical phenomena calculations. Combination of these components gives the steady-state self-consistent model which enables a simulation of various aspects of a semiconductor disk laser operation. A numerical analysis of carrier and power losses within the active region of 1.3-μm GaInNAs/GaAs semiconductor disk laser has been carried out using this model.
Źródło:
Optica Applicata; 2016, 46, 2; 199-211
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Samojezdne opryskiwacze polowe i ich trendy rozwojowe
Self propelled field sprayers and theirs development trends
Autorzy:
Kluza, P.A.
Kluza, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/8839471.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:
Acta Scientiarum Polonorum. Technica Agraria; 2017, 16, 1-2; 35-46
1644-0684
Pojawia się w:
Acta Scientiarum Polonorum. Technica Agraria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty budowy i wykorzystania przyczepianych opryskiwaczy polowych
Selected aspects of construction and use of trailed field sprayers
Autorzy:
Kluza, P.A.
Kluza, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/8841925.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:
Acta Scientiarum Polonorum. Technica Agraria; 2017, 16, 1-2; 23-33
1644-0684
Pojawia się w:
Acta Scientiarum Polonorum. Technica Agraria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emotional Intelligence and Ability to Manage Customer Relationship in Bank Employees of Selected Indian Banks - A Study
Autorzy:
Sahu, Tapas Lata
Das, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/1189944.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Demographic Variables
Emotional Intelligence
Managing Customer Relationships
Opis:
Managing customer relationship is a great challenge in the present era of service revolution. As large numbers of players are now entering into this industry, the intensity of competition is growing among them in very passing day. In the current cut throat competition, customers are becoming very particular to use or not to use services of any organization. Therefore, managing customer relationship is playing dominant role for in almost every service providing organizations, so banks are not an exception. There is a popular belief that higher the emotional intelligence of service provider better will be their ability to manage customer relationship. So the present study is the part of a large study conducted on 300 bank employees working in 5 different banks (both in public and private sector) in the state of Chhattisgarh to assess whether their demographic variables, emotional intelligence and ability to manage customer relationship are related with each other. Data were collected with the help of a schedule to measure emotional intelligence and ability to manage customer relationship and are analyzed with help of ANOVA and Correlations by using SPSS. The study reveals that there exist significant and strong relationship between emotional intelligence, demographic variables and ability to manage customer relationship. Thus, it is concluded that service providers in banks with their high level of emotional intelligence and ability to manage customer relationship can contribute significantly to attract and retain customers and build long term relationship with them.
Źródło:
World Scientific News; 2016, 52; 31-43
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Pumping Beam Width on VECSEL Output Power
Autorzy:
Sokół, A. K.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/226018.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
VECSEL
SDL
semiconductor disk laser
simulation
numerical modeling
power scaling
Opis:
The paper is devoted to a numerical analysis of an influence of a pumping beam diameter on output power of optically pumped vertical-external-cavity surface-emitting lasers. Simulations have been carried out for a structure with a GaInNAs/GaAs active region operating at 1.32 μm. Various assembly configurations have been considered. Results obtained show that laser power scaling is strongly affected by thermal properties of the device.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 3; 239-245
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grounding and extracting modal responses in cognitive agents: 'AND' query and states of incomplete knowledge
Autorzy:
Katarzyniak, R. P.
Pieczyńska-Kuchtiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/907407.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
cognitive agent
semantic communication
language grounding
czynnik poznawczy
komunikacja semantyczna
język programowania
Opis:
In this study an original way of modeling language grounding and generation for a simple set of language responses is presented. It is assumed that the language is used by a cognitive agent and consists of a few modal belief and possibility formulas that are used by this agent to communicate its opinions on the current state of an object. The cognitive agent is asked a simple AND query and the language is tailored to this situation. The agent's knowledge bases are characterized by certain incompleteness of information on the current state of objects. The language of the available responses is originally grounded in the agent's previous empirical experience. According to the assumptions of the cognitive linguistics and the phenomenology of knowledge, this experience is the basic source of meaning represented by the available formulas (responses). In the study the idea of an epistemic satisfaction relation is introduced that describes states of the agent's knowledge in which particular formulas are satisfied in the epistemic sense. Additionally, a formal description of the semantic power of formulas is presented. The concepts of the empirical satisfaction relation and the semantic power of formulas are used to define a model of particular language behavior that preserves the assumption of language grounding. Two examples of possible implementations are given. These implementations are basic ones and refer to statistical characteristics of the stored empirical experience of the cognitive agent.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 249-263
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies on the removal of copper (II) by Ulva fasciata activated carbon and commercially activated carbon
Autorzy:
Suresh Jeyakumar, R.P.
Chandrasekaran, V.
Powiązania:
https://bibliotekanauki.pl/articles/778953.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Ulva fasciata sp.
synthetic wastewater
activated carbons
adsorption
Langmuir
Opis:
In this work, the efficiency of Ulva fasciata sp. activated carbons (CCUC, SCUC and SSUC) and commercially activated carbon (CAC) were studied for the removal of Cu (II) ions from synthetic wastewater. Batch adsorption experiments were carried out as a function of pH, contact time, initial copper concentration and adsorbent dose. The percentage adsorption of copper by CCUC, SSUC, SCUC and CAC are 88.47%, 97.53%, 95.78% and 77.42% respectively. Adsorption data were fitted with the Langmuir, Freundlich and Temkin models. Two kinetic models pseudo first order and the pseudo second order were selected to interpret the adsorption data.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 88-94
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new C0 2D FE model based on improved higher order zigzag theory for the analysis of soft core sandwich plate
Autorzy:
Khandelwal, R. P.
Chakrabarti, A.
Bhargava, P.
Powiązania:
https://bibliotekanauki.pl/articles/265624.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
kompozyty
metoda elementów skończonych
płyty
composites
finite element method
plates
soft-core sandwich
Opis:
An efficient C0 continuous finite element (FE) model is developed based on a combined theory (refine higher order shear deformation theory (RHSDT) and least square error (LSE) method) for the static analysis of a soft core sandwich plate. In this (RHSDT) theory, the in-plane displacement field for the face sheets and the core is obtained by superposing a global cubically varying displacement field on a zig-zag linearly varying displacement field with a different slope in each layer. The transverse displacement assumes to have a quadratic variation within the core and it remains constant in the faces beyond the core. The proposed model satisfies the condition of transverse shear stress continuity at the layer interfaces and the zero transverse shear stress condition at the top and bottom of the sandwich plate. The nodal field variables are chosen in an efficient manner to circumvent the problem of C1 continuity requirement of the transverse displacements. In order to calculate the accurate through thickness transverse stresses variation, the Least Square Error (LSE) method has been used at the post processing stage. The proposed combined model (RHSDT and LSE) is implemented to analyze the laminated composites and sandwich plates. Many new results are also presented which should be useful for future research.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 395-423
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adiabatic memories : a review
Autorzy:
Bala, G. J.
Perinbam, J. R. P.
Powiązania:
https://bibliotekanauki.pl/articles/378439.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Opis:
Adiabatic Logic is a promising approach with respect to power optimization in digital circuit design. In the recent years researches are carried out to design low power memories using this concept. The various adiabatic memories proposed in the recent years are outlined in this paper.
Źródło:
Electron Technology : Internet Journal; 2005-2006, 37/38, 2; 1-4
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of GaAs- and GaSb-based active regions emitting in the mid-infrared wavelength range
Autorzy:
Piskorski, Ł.
Frasunkiewicz, L.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/200684.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
strained QWs
GaInNAs
GaInAsSb
mid-infrared radiation
numerical analysis
napięte konstrukcje QWs
analiza numeryczna
Opis:
In the present paper the results of the computer analysis of the GaAs-based and GaSb-based active regions that can be applied in compact semiconductor laser sources of radiation at mid-infrared wavelengths are presented. Quantum well material contents and strain dependencies on the maximal gain are investigated. It is shown that above 3 μm the maximal gain obtained for GaInNAs/AlGaInAs active region is high only for thick, highly-strained GaInNAs QWs with N concentration higher than 2%. Much higher gain in this wavelength range can be obtained for GaInAsSb/AlGaAsSb active region, which offers relatively high gain even at 4.5 μm when the Sb content in GaInAsSb and compressive strain in this layer are equal to 50% and − 2%, respectively.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 597-603
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromagnetic rarefied fluid flow over a wedge in the presence of surface slip and thermal radiation
Autorzy:
Das, K.
Sharma, R. P.
Duari, P. R.
Powiązania:
https://bibliotekanauki.pl/articles/264410.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
convective flow
heat transfer
surface slip
magnetic field
thermal radiation
przepływ konwekcyjny
przenoszenie ciepła
pole magnetyczne
promieniowanie cieplne
Opis:
An analysis is presented to investigate the effects of thermal radiation on a convective slip flow of an electrically conducting slightly rarefied fluid, having temperature dependent fluid properties, over a wedge with a thermal jump at the surface of the boundary in the presence of a transverse magnetic field. The reduced equations are solved numerically using the finite difference code that implements the 3-stage Lobatto IIIa formula for the partitioned Runge-Kutta method. Numerical results for the dimensionless velocity and temperature as well as for the skin friction coefficient and the Nusselt number are presented through graphs and tables for pertinent parameters to show interesting aspects of the solution.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 827-837
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic, isotherm and thermodynamics investigation on adsorption of divalent copper using agro-waste biomaterials, Musa acuminata, Casuarina equisetifolia L. and Sorghum bicolor
Autorzy:
Mokkapati, R.P.
Mokkapati, J.
Ratnakaram, V.N.
Powiązania:
https://bibliotekanauki.pl/articles/778519.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
banana bunch-stem powder
casuarinas fruit powder
sorghum stem powder
removal
copper
adsorption
Opis:
Three novel and distinct agricultural waste materials, viz., Casuarinas fruit powder (CFP), sorghum stem powder (SSP) and banana stem powder (BSP) were used as low cost adsorbents for the removal of toxic copper(II) from aqueous solutions. Acid treated adsorbents were characterized by SEM, EDX and FTIR. Different factors effecting adsorption capacity were analyzed and the efficiency order was BSP>SSP>CFP. Based on the extent of compatibility to Freundlich/Langmuir/D-R/Temkin adsorption isotherm and different models (pseudo-first and second order, Boyd, Weber’s and Elovich), chemisorption primarily involved in the case of CFP and SSP, whereas, simultaneous occurrence of chemisorption and physisorption was proposed in the case of BSP. Based on the observations, it was proposed that three kinetic stages involve in adsorption process viz., diffusion of sorbate to sorbent, intra particle diffusion and then establishment of equilibrium. These adsorbents have promising role towards removal of Cu(II) from industrial wastewater to contribute environmental protection.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 68-77
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk factors and patterns related to dental caries evaluated with caries assessment spectrum and treatment (cast) among schoolchildren of Bhubaneswar, India
Autorzy:
Nagarajappa, R.
Naik, D.
Satyarup, D.
Dalai, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/873935.pdf
Data publikacji:
2020
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Objectives. To determine the complete range of carious conditions and furthermore to compare the risk factors and patterns of dental caries amongst schoolchildren aged 12 and 15 years in Bhubaneswar. Material and Methods. Cross-sectional descriptive survey was performed among 800 schoolchildren to assess the dental caries status by Caries Assessment Spectrum and Treatment (CAST) scoring. Chi-square, parametric t-test, one-way ANOVA with post hoc Bonferroni and stepwise multiple linear regression were utilized for statistical analysis. Results. Study population comprised of 476 (59.5%) boys and 324 (40.5%) girls, of which 356 (44.5%) and 444 (55.5%) represented the 12- and 15-years age group respectively. Prevalence of dental caries was 60.6% (Mean 0.38+0.545). Younger age group children presented a significant (p<0.05) lower caries prevalence (54.8%) as against 65.3% in 15 years children. Majority, 189 (23.6%) revealed distinct visual change in enamel (code 3). Acuteness of disease constructed on maximum CAST score for each subject showed that teeth with morbidity (28.5%) is higher followed by reversible pre-morbidity (23.6%) and serious morbidity (6.5%). Predominantly first molars were generally influenced. Significant interpreters in plunging order for DMFT were frequency of cleaning teeth and sweet score. Conclusions. A creative instrument named CAST index describes full continuum of dental caries. Its utilization in epidemiological studies is exceptionally encouraging as it is less tedious and more cost effective. It can possibly be a useful tool for planning caries control programs in both individual and community levels.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2020, 71, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical approach to slip flow of a micropolar fluid above a flat permeable contracting surface
Autorzy:
Parthiban, R.
Palani, G.
Tinker, Seema
Sharma, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/1839882.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
warstwa graniczna
radiator
płyn mikropolarny
ssanie
boundary layers
heat sink
micropolar fluid
slip condition
suction
injection
Opis:
A plain linear penetrable contracting sheet with slip over a micro-polar liquid with a stagnation-point flow is analyzed. Through similarity mapping, the mathematical modeling statements are transformed as ODE’s and numerical results are found by shooting techniques. The varying impacts of physical quantities on the momentum, micro-rotation, and temperature were demonstrated through graphs. The computed measures including shear and couple stress with distinct measures of factors involved in this proposed problem are presented through a table.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 173-185
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient free convective radiative flow between vertical parallel plates heated/cooled asymmetrically with heat generation and slip condition
Autorzy:
Gaur, P. K.
Sharma, R. P.
Jha, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/264930.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
wytwarzanie ciepła
promieniowanie cieplne
MHD
slip flow
heat generation
thermal radiation
Opis:
Investigation of an MHD convective flow of viscous, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel porous plates is carried out. Forchheimer-Brinkman extended Darcy model is assumed to simulate momentum transfer within the porous medium. A magnetic field of uniform strength is applied normal to the plates. The analytical results are evaluated numerically and the presented graphically to discuss in detail the effects of different parameter entering into the problem.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 365-384
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Transitions and Stability of Group IV BCC Metals
Autorzy:
Verma, M. L.
Verma, A.
Rathore, R. P. S.
Powiązania:
https://bibliotekanauki.pl/articles/1968848.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
Opis:
Born stability criteria were employed in the framework of extended generalised exponential potential to calculate the theoretical strength and range of stability of a perfect uniaxially stressed crystal lattice of group IV bcc metals: titanium, zirconium, and hafnium. The analysis depicts two ranges of stability, a bcc phase and a body centered tetragonal phase. The computed value of theoretical strength and strain of bcc Ti, Zr and Hf agree satisfactorily with the experimental limits. The second-order elastic constants C$\text{}_{11}$ and C$\text{}_{12}$ were also computed.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 479-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Chlamydophila psittaci antibodies from captive birds at the Ninoy Aquino Parks and Wildlife Nature Center, Quezon city, Philippines
Autorzy:
Maluping, R P
Oronan, R.B.
Toledo, S.U.
Powiązania:
https://bibliotekanauki.pl/articles/50103.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
parasitic bacteria
Ninoy Aquino Park
bird
respiratory disease
Quezon city
Wildlife Nature Center
Chlamydophila psittaci
zoonotic disease
Philippines
Opis:
The present study was undertaken to detect the presence of Chlamydophila psittaci antibodies in captive birds at the Wildlife Rescue Center, Ninoy Aquino Parks and Wildlife Nature Center, Quezon City, Philippines. Blood was collected from 36 birds of different species and the presence of antibodies against C. psittaci was detected using an ELISA-based test kit. 25% of the samples demonstrated antibodies against C. psittaci. The results of this study confi rmed the presence of C. psittaci antibodies among the captive birds examined.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Behaviour and Lattice Vibrations in bcc V and Nb
Autorzy:
Verma, A.
Verma, M. L.
Rathore, R. P. S.
Powiązania:
https://bibliotekanauki.pl/articles/1946133.pdf
Data publikacji:
1996-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Dj
62.20.Dc
Opis:
A model is developed by extending the generalised form of exponential potential known as extended generalised exponential potential to account for: (a) a realistic realization of interactions in all separations in general and that of small separations in particular, (b) three-body and electronic effects into the interaction in an alternative and simpler form, (c) a model free from usual fitting procedure. The model is employed to compute the cohesive energy, phonon spectra and second- and third-order elastic constants for group VA bcc metals V and Nb. The computed results showing good agreement with the experimental findings lend reliability and credibility to the potential.
Źródło:
Acta Physica Polonica A; 1996, 90, 3; 547-556
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nucleation on the Stability of BCC Metals
Autorzy:
Verma, A.
Verma, M. L.
Rathore, R. P. S.
Powiązania:
https://bibliotekanauki.pl/articles/1963285.pdf
Data publikacji:
1997-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
Opis:
Numerical calculations are made of theoretical strength and range of stability of a perfect uniaxially stressed crystal lattice of bcc vanadium, niobium and tantalum in the framework of extended generalised exponential potential by applying Born stability criteria. Two ranges of stability, a bcc phase and a body centered tetragonal phase are found to exist. The computed values of theoretical strength and strain of bcc V, Nb and Ta agree reasonably well with the experimental limits.
Źródło:
Acta Physica Polonica A; 1997, 91, 3; 583-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lorentz force eddy current testing : two-dimensional numerical study
Testowanie wiroprądowe w oparciu o pomiar siły Lorentza : dwuwymiarowe studium numeryczne
Autorzy:
Zec, M.
Uhlig, R.P.
Ziolkowski, M.
Brauer, H.
Powiązania:
https://bibliotekanauki.pl/articles/159012.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
siła Lorentza
magnes trwały
prądy wirowe
wady
testowanie wiroprądowe
permanent magnet
eddy currents
Lorentz force
defects
defect detection
contactless testing
non-destructive testing
Opis:
The main aim of this work is to provide 2D numerical data for the motion of a permanent magnet in the vicinity of a solid state body. The goals of this work include the evaluation of induced eddy current, total and current Lorentz Force (LF) distribution insi de a solid body accounting for pre-defined defects. The approach of logi cal expressions and of a moving mesh were used successfully to solve the presented linear eddy current testing problem (LET). The logi cal expression approach, for the similar number of degrees of freedom, was able to solve the given problem approximately 8 times faster than the moving mesh approach.
Testowanie z wykorzystaniem prądów wirowych i pomiarów siły Lorentza jest bezstykową i nieniszczącą metodą służącą do detekcji głębokich defektów w materiałach stałych przewodzących. Zasada tej metody jest oparta na pomiarze siły Lorentza wytwarzanej w wyniku wzajemnego ruchu między magnesem trwałym i badanym materiałem. Gdy magnes jest przesuwany ponad defektem, to siła Lorentza działająca na magnes ulega chwilowym zmianom. Detekcja tych perturbacji siły Lorentza pozwala identyfikować i lokalizować defekty w materiale. Głównym celem niniejszej pracy jest dostarczenie dwuwymiarowych danych numerycznych dla ruchu magnesu trwałego w sąsiedztwie ciała stałostanowego. Analiza jest przeprowadzona dla tzw. liniowego problemu testowania wiroprądowego, biorącego pod uwagę liniowy ruch magnesu trwałego nad prętem w stanie stałym. Metodę elementów skończonych opartą na handlowym solwerze COMSOL Multiphysics użyto do symulowania rzeczywistej geometrii danego problemu z odpowiednimi równaniami różniczkowymi. Cele tej pracy obejmują ocenę indukowanych prądów wirowych, rozkład ogólnych i lokalnych sił Lorentza.
Źródło:
Prace Instytutu Elektrotechniki; 2011, 252; 55-66
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lorentz force eddy current testing: validation of numerical results
Testowanie wiroprądowe w oparciu o pomiar siły Lorentza
Autorzy:
Uhlig, R.P.
Zec, M.
Ziolkowski, M.
Brauer, H.
Powiązania:
https://bibliotekanauki.pl/articles/159341.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
stan stały
pomiar nieniszczący
wady
model analityczny
model numeryczny
symulacja
metoda elementów skończonych
solid state specimens
non-destructive measurement
defects
analytical models
numerical models
simulation
finite element method
Opis:
The paper at hand reports investigations regarding the characterization of an a electrically conducting solid state specimen with a new non-destructive measurement technique for the detection of subsurface defects. On the one hand it is necessary to characterize a specimen without defects in order to detect defects, on the other hand we show the validation of the analytical and numerical models that are used to simulate the application.
Artykuł opisuje badania charakteryzujące elektrycznie przewodzącą próbkę w stanie stałym przy użyciu nowej nieniszczącej techniki pomiarowej w celu detekcji defektów podpowierzchniowych
Źródło:
Prace Instytutu Elektrotechniki; 2011, 251; 135-145
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incidence of Phytophthora infestans (Mont.) de Bary on potato and tomato in Maine, 2006–2010
Autorzy:
Olanya, O.M.
Larkin, R.P.
Honeycutt, C.W.
Powiązania:
https://bibliotekanauki.pl/articles/66822.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Late blight, caused by Phytophthora infestans (Mont.) de Bary, is a devastating disease which is found worldwide. In Maine, United States (US), we recorded late blight on potato and tomato during the 2006–2009 cropping seasons. From 2006 to 2008, over 90% of the diseased samples were collected in potato fields from northern and central Aroostook County in Northern Maine, US. Then, in 2009, an unprecedented influx of inoculum on infected tomato transplants shipped to retail garden centers throughout the Northeast US significantly changed the late blight infection patterns. In 2009, 43% of diseased samples obtained were from tomato, and 57% from potato, and disease was found to occur all over the state. Moran’s index and spatial autocorrelation analysis of disease occurrence, geographical locations, host factors, and infection levels from previous years, were not statistically significant (p > 0.05). Therefore, random distributions of late blight incidences were recorded across locations and years. Nearest neighbor analysis revealed that mean spatial distances for late blight occurrence ranged from 1.51 to 71.4 km from 2006 to 2008, and 7.4 to 126.5 km in 2009. The frequency and locations of late blight outbreaks in 2009 were substantially greater than in 2006, 2007, and 2008, as affected by the influx of inoculum and movement of infected tomato seedlings as well as conducive environmental conditions. All were contributing factors for late blight occurrence in Maine. In 2010, few disease samples were collected, indicating that the influx of inoculum in 2009 did not persist to cause widespread disease in 2010. The reduction of inocula sources, fungicide protection of susceptible hosts, and the removal and destruction of infected tomato seedlings and potato cull piles or volunteer plants, can greatly reduce late blight occurrences and improve potato production. These actions should be considered as an integral part of late blight management programmes in regions where late blight commonly occurs.
Źródło:
Journal of Plant Protection Research; 2015, 55, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerobic conditions and antioxidative system of Azolla caroliniana Willd. in the presence of Hg in water solution
Autorzy:
Bennicelli, R.P.
Balakhnina, T.I.
Szajnocha, K.
Banach, A.
Powiązania:
https://bibliotekanauki.pl/articles/25032.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
superoxide dismutase
oxygen availability
toxic substance
aqueous solution
antioxidative system
Azolla caroliniana
aerobic condition
heavy metal
plant
Źródło:
International Agrophysics; 2005, 19, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of convective heat and mass conditions in magnetohydrodynamic boundary layer flow with joule heating and thermal radiation
Autorzy:
Sharma, R. P.
Tinker, Seema
Gireesha, B. J.
Nagaraja, B.
Powiązania:
https://bibliotekanauki.pl/articles/1839793.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja
magnetohydrodynamika
reakcja chemiczna
promieniowanie cieplne
convection
MHD
Joule heating
chemical reaction
thermal radiation
Opis:
A free convection viscous MHD flow over a semi-infinite vertical sheet with convective heat and mass conditions has been considered. The effects of thermal radiation, chemical reaction and Joule heating on flow are also accounted. The governing nonlinear partial differential equations have been transformed into a set of highly non-linear coupled ordinary differential equations (ODEs) using appropriate similarity transformations. Numerical solutions of transformed equations are obtained by employing the 5th order Runge-Kutta Fehlberg technique followed by the shooting technique. The influences of different flow parameters on the momentum, energy and mass field are discussed and shown graphically. Results reveal that temperature and concentration profiles enhance due to increasing heat and mass Biot number parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 103-116
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Road and street smart lighting control systems as a new application area of the hot-potato protocol
Autorzy:
Kiedrowski, P.
Boniewicz, P.
Lopez, J. G.
Prado, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/97614.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
smart lighting
smart grid
lighting control network
road lighting
street lighting
PLC
WSN
Opis:
This paper presents the new application area of the hot-potato routing protocol, which is a “last-mile” communication network for controlling systems of road and street lighting. Four variants of the hot-potato protocol are analyzed with use of the graph theory. For the assessment of the traffic parameters the ETX parameter is used in relation to the length of the shortest path. Proposed methods are independent of the media type and can be implemented either in wireless or PLC.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 521-530
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of the current state-of-the-art in Fano resonance-based plasmonic metal-insulator-metal waveguides for sensing applications
Autorzy:
Adhikari, R.
Chauhan, D.
Mola, G. T.
Dwivedi, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/2063886.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
coupled resonator
Fano resonance
finite element method
plasmonic nanosensor
sensitivity
waveguide
Opis:
Fano resonance is an optical effect that emerges from the coherent coupling and interference (constructive and destructive) between the continuous state (background process) and the Lorentzian state (resonant process) in the plasmonic waveguide-resonator system. This effect has been used in the applications like optical sensors. These sensors are extensively used in sensing biochemicals and gases by the measurement of refractive index changes as they offer high sensitivity and ultra-high figure of merit. Herein, we surveyed several plasmonic Fano sensors with different geometries composed of metal-insulator-metal waveguide(s). First, the resonators are categorized based on different architectures. The materials and methods adopted for these designs are precisely surveyed and presented. The performances are compared depending upon the characterization parameters like sensitivity and figure of merit. Finally, based on the survey of very recent models, the advances and challenges of refractive index sensing deployed on Fano resonances are discussed.
Źródło:
Opto-Electronics Review; 2021, 29, 4; 148--166
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and in vitro cytotoxic activity of 11-methylixoside isolated from bark of Randia dumetorum Lamk.
Izolacja i działanie cytotoksyczne in vitro 11-metyliksozydu wyizolowanego z kory Randia dumetorum Lamk.
Autorzy:
Jangwan, J.S.
Aquino, R.P.
Mencherini, T.
Singh, R.
Powiązania:
https://bibliotekanauki.pl/articles/71884.pdf
Data publikacji:
2013
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
isolation
in vitro
cytotoxic activity
11-methylixoside
bark
Randia dumetorum
Rubiaceae
tree
medicinal plant
plant morphology
Opis:
Randia dumetorum (family Rubiaceae) is highly reputed ayurvedic medicinal tree commonly known as the Mainphal. A large deciduous thorny shrub grows up to 5 m of height. It occurs almost throughout India up to 1200 m of altitude. It is found in Himalaya from Jammu East ward ascending to 400 m and from Kashmir to East ward up to 1200 m. 11-methylixoside (compound 1), an iridoid glucoside, was isolated from the bark of this plant. The structure was characterized by using spectroscopic methods including 1D-1HNMR,13C-NMR and 2D-NMR (HSQC,HMBC, DQF-COSY) experiments and confirmed by comparison of their NMR data with those from the literature. This compound has been reported for the first time in Randia dumetorum bark. The 11-methylixoside was subjected to cytotoxic activity against MDA-MB-231 (breast cancer cell line) and SK-MEL-2 (human skin melanoma cell line), BE(2)C (neuroblastoma cell line derived from human bone marrow) and U87MG (human neuronale glioblastoma (astrozytom) cell line showed appreciable cytotoxic effect with IC50 value 63.10 µg/ml concentration for SK-MEL-2 (human skin melanoma cell line).
Randia dumetorum (rodzina Apiaceae) jest rośliną cenioną w medycynie aiurwedyjskiej, znaną pod nazwą Mainphal. Duży, liściasty, ciernisty krzew osiąga wysokość 5 m. Występuje praktycznie w całych Indiach do wysokości 1200 m. Można go znaleźć w Himalajach od Jammu (400 m) do Kaszmiru (1200 m). Z kory tej rośliny wyizolowano glukozyd irydoidowy 11-metyloksyd (składnik 1). Jego strukturę zbadano za pomocą metod spektroskopowych obejmujących 1D-1HNMR,13C-NMR i 2D-NMR (HSQC,HMBC, DQF-COSY) i potwierdzono poprzez porównanie jego NMR danych z danymi literaturowymi. Obecność tego składnika stwierdzono po raz pierwszy w korze Randia dumetorum. Działanie cytotoksyczne 11-metyliksozydu było badane przeciw MDA-MB-231 (linia komórkowa raka sutka) i SK-MEL-2 (linia komórkowa czerniaka), BE(2)C (linia komórkowa neuroblastomy uzyskana z ludzkiego szpiku kostnego) i U87MG (linia komórkowa ludzkiej glioblastomy (gwiaździak). Wykazano znaczne działanie cytotoksyczne z wartością IC50 w stężeniu 63.10 µg/ml przeciw SK-MEL-2 (linia komórkowa czerniaka).
Źródło:
Herba Polonica; 2013, 59, 1
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to enhance a room-temperature operation of diode lasers and their arrays
Autorzy:
Sarzała, R. P.
Sokół, A. K.
Kuc, M.
Nakwaski, W.
Powiązania:
https://bibliotekanauki.pl/articles/174004.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
diode laser
thermal management
thermal crosstalk
semiconductor arrays
Opis:
A key problem to be solved during designing productive diode lasers and their lasing arrays is their proper thermal management enabling efficient high-power operation. Strictly speaking, the above demand leads to optimization of their structures to enhance lasing performance for high operation currents. It is well-known that deterioration of laser performance is mostly induced by excessive temperature increases within their volumes. In diode-laser arrays, additionally thermal crosstalk between array emitters should be taken into account. In the present paper, physics of heat-flux generation within the laser-diode volume and its extraction from it is analysed and described with the aid of our self-consistent simulation procedure. Then their thermal optimization is discussed including a proper design of a heat-flux generation within the laser volume, enhancement of its transport towards a laser heat-sink and, additionally in laser arrays, reduction of a thermal crosstalk between individual array emitters. The analysis is carried out using modern nitride edge-emitting ridge-waveguide lasers and their one-dimensional arrays as well as arsenide semiconductor disk lasers as typical examples of modern diode-laser designs. Physical processes responsible for heat-flux generation within these devices and heat-flux extraction from their volumes are analysed and an impact of some construction details on these processes is explained.
Źródło:
Optica Applicata; 2016, 46, 2; 213-226
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of trained health workers in improving the oral hygiene of preschool children
Autorzy:
Satyarup, D.
Dalai, R.P.
Nagarajappa, R.
Naik, D.
Mohanty, I.
Powiązania:
https://bibliotekanauki.pl/articles/2087081.pdf
Data publikacji:
2021
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
health workers
oral hygiene
oral health
oral health education
Opis:
Background. Poor oral health among children is common finding in the rural regions of India. But if the existent structure of primary health care is used, favourable oral health habits and importance of oral health can be instilled in the children and their parents at a very early stage. Objective. To evaluate the effectiveness of Anganwadi workers (AWWs) in improving the oral hygiene of the preschool children through oral health education. Material and methods. 250 children in the age group of 2.5-6 years, were included in the study. The study was conducted in three phases over a period of 8 months which included a follow up of six months. Baseline oral health was determined using a questionnaire assessing the oral hygiene practices and DMFT Index, Plaque Index and Gingival Index. This was re-assessed after 6 months using the same questionnaire and indices. Statistical significance was fixed at p value Ł 0.05. Chi square and paired ‘t’ test were used to assess the difference in the variables after providing oral health education. Results. Out of 250 children, with mean age of 4.24 years, majority were girls (142, 56.8%). The use of fluoridated toothpaste among the study population significantly increased from 34.4% to 41.5% (p=0.001) with the intervention of oral health education (OHE). Decrease in consumption of sticky sugar, addition of sugar in the night-feeds and cleaning of teeth after night-feeds were also found to change significantly. Gingival index showed significant reduction after OHE (p=0.001). Conclusion. The study revealed that training of Anganwadi workers (AWWs) could be used to improve the oral health of the Anganwadi children. They represent an untapped source for delivering oral care to rural communities that otherwise have limited access.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2021, 72, 1; 77-82
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intermittent power smoothing control for grid connected hybrid wind/PV system using battery-EDLC storage devices
Autorzy:
Jayalakshmi, N.S.
Gaonkar, D.N.
Karthik, R.P.
Prasanna, P.
Powiązania:
https://bibliotekanauki.pl/articles/141664.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy storage devices
inverter controller
MPPT controller
power smoothing
PV system
wind power
Opis:
Wind and solar radiation are intermittent with stochastic fluctuations, which can influence the stability of operation of the hybrid system in the grid integrated mode of operation. In this research work, a smoothing control method for mitigating output power variations for a grid integrated wind/PV hybrid system using a battery and electric double layer capacitor (EDLC) is investigated. The power fluctuations of the hybrid system are absorbed by a battery and EDLC during wide variations in power generated from the solar and wind system, subsequently, the power supplied to the grid is smoothened. This makes higher penetration and incorporation of renewable energy resources to the utility system possible. The control strategy of the inverter is realized to inject the power to the utility system with the unity power factor and a constant DC bus voltage. Both photovoltaic (PV) and wind systems are controlled for extracting maximum output power. In order to observe the performance of the hybrid system under practical situations in smoothing the output power fluctuations, one-day practical site wind velocity and irradiation data are considered. The dynamic modeling and effectiveness of this control method are verified in the MATLAB/Simulink environment. The simulation results show that the output power variations of the hybrid wind/PV system can be significantly mitigated using the combination of battery and EDLC based storage systems. The power smoothing controller proposed for the hybrid storage devices is advantageous as compared to the control technique which uses either battery or ultracapacitor used for smoothing the fluctuating power.
Źródło:
Archives of Electrical Engineering; 2020, 69, 2; 433-453
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical constituents of ethanol extract of leaves and molluscicidal activity of crude extracts from Vitex trifolia Linn.
Składniki chemiczne etanolowego wyciągu z liści i działanie przeciwślimakowe nieoczyszczonego wyciągu z Vitex trifolia Linn.
Autorzy:
Jangwan, J.S.
Aquino, R.P.
Mencherini, T.
Picerno, P.
Singh, R.
Powiązania:
https://bibliotekanauki.pl/articles/71567.pdf
Data publikacji:
2013
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
chemical constituent
ethanol extract
leaf
molluscicidal activity
crude extract
Vitex trifolia
Verbenaceae
beta-sitosterol
ursolic acid acetate
Opis:
β-sitosterol and two triterpenoids: ursolic acid acetate and platanic acid have been isolated from ethanolic extract of Vitex trifola leaves. β-sitosterol was previously isolated from the leaves, stem and seeds of Vitex trifolia. Ursolic acid acetate has been isolated for the first time in this plant species. Platanic acid has been reported for the first time in Vitex trifolia and even in the family of this plant: Verbenaceae. These compounds were characterized using spectroscopic methods including 1D-1HNMR, 13CNMR, ESIMS and 2D-NMR (HSQC, HMBC, COSY) experiments and confirmed by comparison of their NMR data with those from the literature. A preliminary molluscicidal test for ethanol, chloroform and n-hexane extracts of leaves of Vitex trifolia against Biomphalaria alexandrina adult snails showed that ethanol extract of leaves with LC50 value 26.42 mg/l (27.92 mg/l – 24.99 mg/l) was more effective than n-hexane extract with LC50 value 35.48 mg/l (43.81 mg/l – 28.72mg/l) and chloroform extract with LC50 value 46.77 mg/l (53.59 mg/l – 43.81 mg/l) after 24 h exposure.
Z etanolowego wyciągu z liści Vitex trifola wyizolowano β-sitosterol i dwa triterpenoidy: octan kwasu ursolowego i kwas platanowy. Poprzednio z liści, łodyg i nasion Vitex trifola był wyizolowant β-sitosterol. Octan kwasu ursolowego został wyizolowany po raz pierwszy z rośliny tego gatunku. Występowanie kwasu platanowego w Vitex trifolia oraz w rodzinie Verbenaceae zostało opisane po raz pierwszy. Składniki te scharakteryzowano, używając metod spektroskopowych, stosując badania 1D-1HNMR, 13CNMR, ESIMS and 2D-NMR (HSQC, HMBC, COSY) oraz potwierdzono porównaniem ich danych NMR z danymi literaturowymi. Wstępny test działania przeciwślimakowego wyciągów etanolowego, chloroformowego i n-heksanowego z liści Vitex trifolia przeciw dorosłym ślimakom Biomphalaria
Źródło:
Herba Polonica; 2013, 59, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanofluid motion past a shrinking sheet in porous media under the impact of radiation and heat source/sink
Autorzy:
Sharma, R. P.
Jha, A. K.
Gaur, P. K.
Mishra, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/264665.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
promieniowanie cieplne
wytwarzanie ciepła
MHD
nanofluid
shrinking surface
thermal radiation
heat generation
porous medium
Opis:
An investigation has been carried out for the MHD 3-dimensional flow of nanofluid over a shrinking sweet saturating a porous media in the presence of thermal radiation and heat generation. Convective boundary conditions for the flow phenomena are used in the present analysis. The governing equations are reduced to ODEs employing suitable similarity transformations. The solutions of formulated differential equations have been attained mathematically by fourth order R-K technique along with the shooting method. The impact of the governing constraints on momentum, heat, and local Nusselt number, are explored. It is noticed that the momentum and heat decrease with raise in the porosity variable, temperature reduces with an enhance in the thermal radiation variable, and temperature enhances with an enhance in the heat source/sink parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 183-199
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bone losses in obese, ovariectomized rats appear to be independent from sclerostin-induced inhibition of the Wnt/β-catenin pathway
Autorzy:
Radzki, R.P.
Bieńko, M.
Filip, R.
Polak, P.
Michalik Wolska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2085877.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
dietary induced obesity
bone
sclerostin
pQCT
DXA
rats
ovariectomy
Opis:
Introduction. Overweight and obesity, as well as a gonadal function, are pivotal factors influencing bone tissue metabolism. Materials and method. The aim of the study was to determine the effect of dietary induced obesity (DIO) on bone tissue metabolism in sham-operated (SHO) or ovariectomized (OVX) adult female Wistar rats. Additionally, the influence of DIO in SHO or OVX on the concentration of sclerostin in the blood serum was analyzed. After SHO or OVX, the rats were placed in groups (n=8) and either received a standard diet (11.5 MJ/kg) (SHO-CON; OVX-CON) or a high-energy diet (17.6 MJ/kg) (SHO-FAT; OVX-FAT). The experiment lasted for 90 days and allowed for the establishment of osteopenia in OVX females and obesity in the rats that had received the high-energy diet. Results. The results of the study demonstrate that obesity or/and ovariectomy increases the resorption of femora and tibiae, hence decreasing the densitometric and mechanical parameters affecting the bone structure in adult females rats. The strongest osteodegenerative effect was seen in the OVX-FAT females. Interestingly, the degree of bone tissue degradation caused exclusively by ovariectomy was similar to that found in the obese sham-operated rats. Conclusions. Bone losses invoked by DIO seem to be independent from the Wnt/β-catenin pathway inhibition induced by sclerostin. While further study is necessary, the obtained results suggest that the usage of sclerostin anti-body in the treatment of osteoporosis can be ineffective, and in obese patients the undertaking of such therapy should be reassessed.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 3; 394-400
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nesfatin-1 prevents negative changes in bone in conditions of developing osteopenia
Autorzy:
Puzio, I.
Tymicki, G.
Pawłowska, M.
Bieńko, M.
Radzki, R.P.
Powiązania:
https://bibliotekanauki.pl/articles/2085429.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
nesfatin-1
osteopenia
osteoporosis
ovariectomy
rat
DXA
pQCT
immunohistochemistry
Opis:
Objective. The aim of the study was to determine the effect of nesfatin-1 on bone properties in female rats in the conditions of developing osteopenia induced by ovariectomy (OVX). Materials and method. The experiment was performed on 21 female Wistar rats assigned to 3 groups receiving intraperitoneally physiological saline (SHO, OVX-PhS) and nesfatin-1 in dose 2 μg/kg BW of (OVX-NES) once a day for 8 wks. At the end of the experiment, the rats were scanned using the DXA method to determine the body composition, tBMC, and tBMD. The isolated femora and tibia were tested with the DXA method for BMD and BMC, and with the pQCT method for separate analysis of the cortical and trabecular bone tissue. The bone strength parameters were also determined. The immunohistochemical method was used for determination of nesfatin-1 localization in growth cartilage. Bone metabolism markers (osteocalcin, bALP, and NTx) were identified using an ELISA kit. Results. OVX exerts a negative effect on bone tissue. The nesfatin-1 administration influenced positively the DXA parameters of tibia. TvBMD and TbvBMD measured by pQCT in metaphysis of bones were significantly higher in the OVX-NES group than in OVX-PhS. No differences were found in the values of bone strength parameters between SHO and OVX-NES females. Extra- and intracellular immunohistochemical reaction for nesfatin-1 was observed in all zones of growth cartilage, with the strongest reaction detected in the calcifying zone. Nesfatin-1 administration caused a significant increase in the osteocalcin and bALP concentration in relation to the OVX-PhS animals. Conclusion. The results of the experiment indicate that nesfatin-1 exerts a protective effect on bone tissue properties and can be used in the prevention of osteoporosis.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 66-75
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic structures of CdSe quantum dots embedded in ZnSe
Autorzy:
Jayawardhana, M. R. P. I.
Wijewardena Gamalath, K. A. I. L.
Powiązania:
https://bibliotekanauki.pl/articles/1178287.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
LCAO method
Quantum dot
Sparse matrices
adjacency matrix
folded spectrum method
optical matrix elements
strain effects
valence band offset
Opis:
The electronic structures and optical matrix elements of CdSe semiconductor quantum dots of near cubical, hemispherical and cylindrical shape embedded in ZnSe were calculated. Bulk Hamiltonian matrices were obtained using the empirical tight binding method including spin-orbital coupling and relativistic effects. All quantum dots were simulated in reciprocal space and the number of atoms in each quantum dot was kept nearly equal for the comparison purpose. An adjacency matrix was produced which indicates the adjacencies of unit cells and the bulk Hamiltonian was included for each adjacency point in order to obtain the quantum dot Hamiltonians. The strain effects, valence band offset and spin orbital coupling were included in the calculations. The quantum dot Hamiltonian was solved to obtain the highest and lowest eigenvalues from which the electronic structure was obtained. Then eigenvalues near integers ranging from the lowest eigenvalue to highest eigenvalue was generated for the point.
Źródło:
World Scientific News; 2017, 86, 3; 205-225
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Actual Status of the Cikapundung River Waters in the Densely-Inhabited Slum Area, Bandung City
Autorzy:
Rusdiyanto, Edi
Sitorus, Santun R. P.
Noorachmat, Bambang Pramudya
Sobandi, Ramalis
Powiązania:
https://bibliotekanauki.pl/articles/2028189.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
densely inhabited slum
microbiological parameters
physico-chemical parameters
water quality
Opis:
This research was intended to analyze the water quality of the Cikapundung River in Bandung City around the densely-inhabited slums and also to analyze the total number of bacteria coliform and Escherichia coli in the Cikapundung River, Bandung City. The research data was obtained by observing and performing a laboratory analysis through the assessment of environmental quality standard threshold based on the Government Regulation (PP) No. 82 of 2001. The results of laboratory analysis show that the actual condition of water quality of the Cikapundung River is overall classified as polluted, indicating 7 microbiological and physico-chemical parameters which have exceeded the quality standard such as: TSS, DO, BOD, COD, detergent/surfactant, total coliform, and Escherichia coli. In the upper part, there are 6 parameters below the quality standard, consisting of 4 physicochemical parameters and 2 microbiological parameters. In the middle part, there are 8 parameters below the quality standard consisting of 6 physico-chemical parameters and 2 microbiological parameters. In the lower part, there are 6 parameters that exceeded the quality standard consisting of 4 physico-chemical parameters and 2 microbiological parameters. The seasonal difference of parameters averagely has shown that the water quality in the rainy season is better than in the dry season. However, on average, the water sampling taken before flowing to the village has a better quality than past the village.
Źródło:
Journal of Ecological Engineering; 2021, 22, 11; 198-208
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pesticide [glyphosate] on dehydrogenase activity, pH, Eh and gases production in soil [laboratory conditions]
Autorzy:
Bennicelli, R.P.
Szafranek-Nakonieczna, A.
Wolinska, A.
Stepniewska, Z.
Bogudzinska, M.
Powiązania:
https://bibliotekanauki.pl/articles/25248.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2009, 23, 2; 117-122
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of fructan-enriched diet on bone turnover parameters in ovariectomized rats under calcium restriction
Autorzy:
Topolska, K.
Bieńko, M.
Filipiak-Florkiewicz, A.
Radzki, R.P.
Cieślik, E.
Powiązania:
https://bibliotekanauki.pl/articles/2085720.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
fructans
calcium dietary restriction
bone turnover
densitometry
ovariectomy
Opis:
Introduction. Osteoporosis, the “quiet epidemic”, is one of the most serious threats to public health. It is known that estrogen plays a significant role in the regulation of bone turnover, and its loss at menopause causes osteoporosis. Added to this, insufficient calcium intake accelerates bone mass loss, increasing the risk of fractures. Objective. The study aimed to answer the question whether a fructan-enriched diet could be helpful in preventing from disturbances in bone turnover caused by calcium restriction combined with ovariectomy-induced estrogen deficiency. The differences related to the kind of fructan and “matrix effect” of fructan action (form of addition) were also evaluated. Materials and method. The study was conducted using sham-operated (control groups) or ovariectomized (OVX) rats fed a calcium restricted diet. The treatment diets contained one of three fructan sources – Jerusalem artichoke, yacon and Beneo Orafti Synergy1 – added alone or as an ingredient of strawberry sorbet, all in the amount providing 8% fructans. Analyses of biological material included: serum Ca, Mg and P concentrations, alkaline phosphatase activity (ALP), osteocalcin (OC) and C-telopeptide degradation products from type I collagen (CTX). Densitometric parameters of femora were also assayed. Results. Among markers of bone turnover, the ALP activity depended both on the kind of fructan and the form of addition. The highest value was shown in the OVX group fed a low-calcium diet, whereas administration of diet enriched with Jerusalem artichoke led to an almost 50% decrease in the value of this parameter. Dietary fructans also lowered the OC level. Feeding rats with diet containing sorbet enriched in yacon or Jerusalem artichoke resulted in a decrease of CTX, compared to the diet containing yacon alone or fructan formulation in both forms No significant differences were observed in densitometric parameters between treatment groups. Conclusions. The obtained findings suggest that fructan administration with a calcium-restricted diet might exert a positive effect on bone turnover parameters. Regarding the form of their addition, it is possible that other constituents of sorbets contributed to the fructan action. It remains open whether this impact would be significant over a longer period of time.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 2; 219-224
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of FLOTAC and CFF techniques in detecting gastrointestinal parasites in water buffaloes (Bubalus bubalis)
Autorzy:
Salvador, R.T.
Abalos, R.P.
Ruba, A.M.
Mingala, C.N.
Powiązania:
https://bibliotekanauki.pl/articles/5746.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasitism
FLOTAC technique
CFF technique
detection
gastrointestinal parasite
parasite
water buffalo
Bubalus bubalis
nematode
prevalence
Opis:
The objective of the study was to compare the usefulness of FLOTAC and centrifugal fecal flotation (CFF) techniques. More specifically, the taxonomic classes (Nematoda and Cestoda) of endoparasites present in fecal samples of buffaloes are identified, the sensitivity and specificity of FLOTAC relative to CFF are calculated, and the agreement of both techniques is evaluated using Kappa statistics. Fresh fecal samples from 220 buffaloes in 10 municipalities were collected. Sheather’s sugar was used as a flotation solution for both the FLOTAC and CFF techniques. Of the 220 animals, 109 samples were nematode positive and 111 samples were nematode negative according to the FLOTAC technique, while 74 were found to be positive and 146 negative according to the CFF technique. No cestodes were detected by either technique. The calculated sensitivity for FLOTAC is 89.19% and its specificity is 70.55%. Kappa statistics revealed moderate agreement (k=0.535) between the two techniques in detecting nematodes. The prevalence observed based on FLOTAC and CFF test were 49.54% (109/220; 95% CI: 47.75–56.34) and 33.64% (72/220; 95% CI: 27.42–40.3), respectively.
Źródło:
Annals of Parasitology; 2014, 60, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Survival potential of Phytophthora infestans sporangia in relation to environmental factors and late blight occurrence
Autorzy:
Olanya, O.M.
Anwar, M.
He, Z.
Larkin, R.P.
Honeycutt, C.W.
Powiązania:
https://bibliotekanauki.pl/articles/65009.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
survival
Phytophthora infestans
sporangia
environmental factor
late blight
occurrence
climate variability
potato
tomato
Opis:
Potato is an important crop globally and late blight (Phytophthora infestans) often results in severe crop loss. The cost for late blight control can be in excess of $210 million in the United States. We utilised a non-parametric density distribution analysis of local temperature (T) and relative humidity (RH), from 2005 to 2009, to assess and validate sporangia survival potential using survival model and late blight risks during the potato cropping season at Presque Isle, in the northern part of the state of Maine, USA. Modelbased analyses showed that ambient temperatures of 3−30°C and RH values of 45−100% were conducive for sporangia survival. Disease outbreaks and risk periods coincided with a high sporangia survival probability (15−35%). Due to the omission of solar radiation (SR) in the computation of survival potential in previous research, we applied a Cox proportional model to estimate the probability of sporangia survival [i.e. hazard at a specific time H(t)] as a function of baseline hazard (H0) and the influencing parameters. The model is: H(t) = H0(t) × exp(0.067ET + 0.138T + 0.083RH + 0.001SR) where ET is exposure time. The survival model indicated that RH (β = 0.083) and T (β = 0.138) were significant (p < 0.05) factors in sporangia survival in comparison to SR (β = 0.001). The hazard ratio, indicative of sporangia survival risk, varied with the predictors. For the unit increase of T, sporangia survival hazard increased by 1.148 times. The Cox model and sporangia hazard probabilities can be used for short-term disease forecasts based on the risk period most conducive for pathogen survival and targeted fungicide applications for optimum late blight management.
Źródło:
Journal of Plant Protection Research; 2016, 56, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of Azolla caroliniana for the removal of Pb and Cd from wastewaters
Autorzy:
Stepniewska, Z.
Bennicelli, R.P.
Balakhnina, T.I.
Szajnocha, K.
Banach, A.
Wolinska, A.
Powiązania:
https://bibliotekanauki.pl/articles/25345.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2005, 19, 3; 251-255
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of obesity on the bone morphometry and histomorphometry in male and female Wistar rats
Autorzy:
Wolski, D.
Wawrzyniak, A.
Bieńko, M.
Michalik, J.
Radzki, R.P.
Arciszewski, M.B.
Powiązania:
https://bibliotekanauki.pl/articles/2087700.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bone tissue
histomorphometry
humerus
obesity
osteocytes
adipocytes
rats
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 3; 599-608
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Could fructan sources in strawberry matrix be more effective as a tool for improvement of bone structure than these compounds added to diet alone? - Study on osteopenic rat model
Autorzy:
Topolska, K.
Radzki, R.P.
Filipiak-Florkiewicz, A.
Bieńko, M.
Florkiewicz, A.
Cieślik, E.
Powiązania:
https://bibliotekanauki.pl/articles/2085394.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
ovarian hormone deficiency
calcium intake
fructans
bone
Opis:
Introduction. Osteoporosis, a disease associated with ovarian hormone deficiency following menopause, is the most common cause of age-related bone loss. Although an optimal intake of Ca is vital – both bone accretion during growth and maintenance in adult life – a great percentage of the population consumes far below the recommended amounts of this mineral. On the other hand, there are evidences that fructans enhance not only Ca absorption, but bone calcium as well. Objective. In the knowledge that estrogen deficiency and insufficient Ca in the diet during postmenopause cause serious problems with resultant osteoporosis, the aim of this study is to assess the effects of a diet enriched in fructan-containing sources alone, or in the “strawberry matrix”, on the structure of bone in OVX rats under calcium hypoalimentation. Materials and method. Experimental animals were female Wistar rats, sham-operated or ovariectomized. The treatment with Ca-restricted diets also contained one of the sources of fructan (Jerusalem artichoke, yacon, Beneo Orafti Synergy1), in the amount providing 8% of fructans. Femur architecture of rats was assessed by tomography and Ca content by the AAS method. Results. Ovariectomy led to a significant decrease in femoral Ca content, total mineral content and bone density of rats. This study shows that a diet containing inulin-type fructan (especially as a component of strawberry product) improved bone quality (i.e. increase in Ca content in femur, total density in middle part of bone, as well as decrease of endosteal circumference) in OVX rats under calcium hypoalimentation. Conclusions. These findings suggest that a fructan-enriched diet could be potentially useful for postmenopausal osteoporosis. It is important to determine an optimal dietary level of fructan with the long-term goal of developing a dietary strategy in osteoporosis prevention.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 19-28
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AMB flywheel integration with photovoltaic system for household purpose – modelling and analysis
Integracja łożyskowanego ma gnetycznie zasobnika energii kinetycznej z układem paneli fotowoltaicznych dla zastosowań w gospodarstwach domowych – modelowanie i analiza
Autorzy:
Smolinski, M.
Perkowski, T.
Mystkowski, A.
Dragašius, E.
Eidukynas, D.
Jastrzebski, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/301217.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
photovoltaic solar system
photovoltaic panels
AMB flywheel
kinetic energy storage
UPS device
motor-generator
composite materials
instalacja fotowoltaiczna
panele fotowoltaiczne
łożyskowany magnetycznie zasobnik energii
kinetycznej
magazyn energii kinetycznej
urządzenie UPS
silnik/prądnica
materiały kompozytowe
Opis:
This paper presents the design and investigation of a photovoltaic‒flywheel system for household purposes. The main goal of this work is the electrical and mechanical integration of the electromechanical high speed kinetic energy storage as UPS (Uninterruptible Power Supply) with photovoltaic solar system. The paper contains calculation and division of photovoltaic panels system according to its integration with active magnetic bearing (AMB) flywheel and external electric grid. The photovoltaic solar installation costs as well as its size were considered. The composite shell AMB flywheel prototype configuration design (using CAD-software) and two different material variants are investigated and presented. In particularly, the structural composite shell stress calculations of two different materials vs rotational speed are performed using a direct coupling of SolidWorks and Matlab software. The analytical calculations of PV‒flywheel system are provided in order to choose optimal type of photovoltaic panels according to motor/generator flywheel and household energy system requirements. All elements of PV‒flywheel system as transducers, bridges, wiring diagrams, etc., are optimized using Simscape tools. Finally, short- and long-time simulations results of PV‒AMB‒flywheel system and initial experimental results are presented and discussed.
W artykule przedstawiono wstępne badania zintegrowanego układu paneli fotowoltaicznych z łożyskowanym magnetycznie zasobnikiem energii kinetycznej. Głównym celem pracy jest próba integracji elementów elektrycznych i mechanicznych wysokoobrotowego elektromechanicznego magazynu energii kinetycznej jako urządzenia UPS z układem paneli fotowoltaicznych. W szczególności przeprowadzono obliczenia najważniejszych parametrów elektrycznych łożyskowanego magnetycznie zasobnika energii połączonego z układem paneli fotowoltaicznych celem jego integracji z trakcją sieci elektrycznej niskiego napięcia. Wykorzystując pakiety oprogramowania: CAD, SolidWorks i Matlab, wykonano badania symulacyjne wskaźników wytrzymałości koła zamachowego zasobnika energii kinetycznej w szerokim zakresie prędkości obrotowej dla dwóch różnych typów materiałów kompozytowych. Następnie, wykorzystując między innymi narzędzia Simscape, przeprowadzono optymalizację elementów systemu celem dopasowania jego głównych parametrów do wymagań stawianym domowym instalacjom fotowoltaicznym z akumulatorami energii elektrycznej. Wyniki badań symulacyjnych, przeprowadzone w cyklach krótko‒ i długo‒ czasowych, układu paneli fotowoltaicznych zintegrowanych z elektromechanicznym akumulatorem energii potwierdziły wstępne obliczenia i założenia.
Źródło:
Eksploatacja i Niezawodność; 2017, 19, 1; 86-94
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the influence of temperature and water level of the reservoir about the displacement of a concrete dam
Autorzy:
Oro, S. R.
Mafioleti, T. R.
Chaves Neto, A.
Garcia, S. R. P.
Neumann, C.
Powiązania:
https://bibliotekanauki.pl/articles/264428.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zapora betonowa
analiza wieloczynnikowa
monitorowanie strukturalne
structural monitoring
concrete dam
multivariate analysis
Opis:
Multivariate techniques are used in this study to analyze the monitoring data displacements of a concrete dam, measured by means of pendulums, extensometer bases and multiple rod extensometers, taking into account the action of environmental conditions, bounded by the surface temperature of the concrete at ambient temperature and the tank water level. The canonical correlation analysis is used to evaluate the influence of environmental variables in the displacement of structures and dam foundations. The factor analysis is used to identify data sources of variability and order the sensors according to the action of factors. The dates of the measurements are grouped according to similarities in the present observations, by applying the cluster analysis. Then the discriminant analysis is used to assess the groups as to their homogeneity. The results demonstrate that the techniques used for distinguishing the dam responses and identify the effects of changes in environmental conditions on the displacements of the structures and dam foundations.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 107-120
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fish remains, mostly otoliths, from the non-marine early Miocene of Otago, New Zealand
Autorzy:
Schwarzhans, W.
Scofield, R.P.
tennyson, A.J.D.
Worthy, J.P.
Worthy, T.H.
Powiązania:
https://bibliotekanauki.pl/articles/23337.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fish remains
remains
otolith
Early Miocene
Miocene
Otago
New Zealand
Pisces
Eleotridae
Galaxiidae
Retropinnidae
Mataichthys
freshwater fish
Bannockburn Formation
Mataichthys bictenatus
Galaxias angustiventris
Galaxias bobmcdowalli
Galaxias brevicauda
Galaxias papilionis
Galaxias parvirostris
Galaxias tabidus
Prototroctes modestus
Prototroctes vertex
Mataichthys procerus
Mataichthys rhinoceros
Mataichthys taurinus
Opis:
Fish remains described from the early Miocene lacustrine Bannockburn Formation of Central Otago, New Zealand, consist of several thousand otoliths and one skeleton plus another disintegrated skull. One species, Mataichthys bictenatus Schwarzhans, Scofield, Tennyson, and T. Worthy gen. et sp. nov., an eleotrid, is established on a skeleton with otoliths in situ. The soft embedding rock and delicate, three−dimensionally preserved fish bones were studied by CT−scanning technology rather than physical preparation, except where needed to extract the otolith. Fourteen species of fishes are described, 12 new to science and two in open nomenclature, representing the families Galaxiidae (Galaxias angustiventris, G. bobmcdowalli, G. brevicauda, G. papilionis, G. parvirostris, G. tabidus), Retropinnidae (Prototroctes modestus, P. vertex), and Eleotridae (Mataichthys bictenatus, M. procerus, M. rhinoceros, M. taurinus). These findings prove that most of the current endemic New Zealand/southern Australia freshwater fish fauna was firmly established in New Zealand as early as 19–16 Ma ago. Most fish species indicate the presence of large fishes, in some cases larger than Recent species of related taxa, for instance in the eleotrid genus Mataichthys when compared to the extant Gobiomorphus. The finding of a few otoliths from marine fishes corroborates the age determination of the Bannockburn Formation as the Altonian stage of the New Zealand marine Tertiary stratigraphy.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilization/Solidification of Waste Containing Heavy Metals and Hydrocarbons Using OPC and Land Trass Cement
Autorzy:
Masrullita, -
Burhan, R. Y. P.
Trihadiningrum, Y.
Powiązania:
https://bibliotekanauki.pl/articles/952442.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
trass soil
heavy metal
ordinary Portland cement
OPC
stabilization/solidification
Opis:
The stabilization/solidification process (S/S) is one of the alternative methods of treating B3 waste, especially heavy metal. The S/S uses cement as the solidification agent. The cement will bind heavy metal pollutants in a monolithic mass with a sturdy structure, thus inhibiting its movement. The presence of hydrocarbons affects the S/S strength. Therefore, it is necessary to add pozzolan material which can absorb hydrocarbon constituting the cement blocking component of pozzolan cement, i.e. Ordinary Portland Cement (OPC) combined with trass soil. This study aims to determine the maximum content of organic materials in the form of hydrocarbons can stabilize/solidify heavy metals contained in wastes containing hydrocarbons. This research is conducted in two steps. Stage I aims to obtain the optimum composition of the mixture. On the other hand, stage II is to determine the maximum content of hydrocarbons in percent weight that can stabilize/solidify organic wastes containing heavy metals – Cu, Cr, and Pb in artificial wastes. The composition of OPC and trass soil was varied at a ratio of 100: 0, 5:25, 50:50, 25:75 and 0: 100. The hydrocarbons used in step II were paraffin, added to the optimum composition of OPC and trass soil with a proportion of 2.5%, 5%, 5% and 10%. The S/S product quality test was performed, involving: compressive strength test, Toxicity Characteristic Leaching Procedure (TCLP) and paint filter test. Strength test was conducted using a compressive strength testing apparatus Toasters Universal Testing Machine Type RAT-200, MFG No. 20380 CAP 200 tf. TCLP test under US-EPA (method 1311). The method of analysis pertaining to heavy metal concentrations involved a colorimetric method for Cr (VI), neocuproine for Cu, and dithizone for Pb. The paint test refers to the US EPA 9095B method. The results showed that the optimum composition of OPC mixture: trass soil was 50:50, which is the composition used in stage II. The results of compressive strength test were 2770 tons/m2. The TCLP test results for heavy metals Cu and Pb with hydrocarbon addition on Cu 10% and Pb 2.5% reached 0.076 and 0.076 mg/L, respectively. The result of the paint filter test indicates that there is no remaining free fluid.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 88-96
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sources of activator Ca2plus for galanin-induced contractions of rat gastric fundus, jejunum and colon
Autorzy:
Korolkiewicz, R.P.
Konstanski, Z.
Rekowski, P.
Ruczynski, J.
Szyk, A.
Korolkiewicz, K.Z.
Petrusewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/70949.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
galanin
gastric fundus
jejunum
neomycin
colon
contraction
smooth muscle
ryanodine
rat
thapsigargin
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ITO layer as an optical confinement for nitride edge-emitting lasers
Autorzy:
Kuc, M.
Sokół, A. K.
Piskorski, Ł.
Dems, M.
Wasiak, M.
Sarzała, R. P.
Czyszanowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/200863.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
edge-emitting lasers
InGaN/GaN
computer simulation
ITO
optical confinement
Opis:
This paper presents the results of a numerical analysis of nitride-based edge-emitting lasers with an InGaN/GaN active region designed for continuous wave room temperature emission of green and blue light. The main goal was to investigate whether the indium thin oxide (ITO) layer can serve as an effective optical confinement improving operation of these devices. Simulations were performed with the aid of a self-consistent thermal-electrical-optical model. Results obtained for green- and blue-emitting lasers were compared. The ITO layer in the p-type cladding was found to effectively help confine the laser mode in the active regions of the devices and to decrease the threshold current density.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 147-154
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ON-TIME: A Closed-Loop Real-Time Traffic Control Framework in a Realistic Railway Environment
ON-TIME: Struktura kierowania ruchem kolejowym w czasie rzeczywistym oparta na układzie zamkniętym w rzeczywistym środowisku
Autorzy:
Quaglietta, E.
Corman, F.
Goverde, R. M. P.
Powiązania:
https://bibliotekanauki.pl/articles/952276.pdf
Data publikacji:
2015
Wydawca:
Instytut Kolejnictwa
Tematy:
real-time rescheduling
closed-loop model predictive control
stability analysis
quality of dispatching plans
zmiana rozkładu w czasie rzeczywistym
sterowane predykcyjne zamkniętego układu
analiza stabilności
jakość systemu kierowania ruchem
Opis:
A wide literature is available on models and tools for the optimal real-time management of railway traffic, but the knowledge of their effects on real operations is still blurry and very limited due to the scarce implementation of these systems in practice. This paper analyses how these tools perform when interfaced in a closed-loop setup with a realistic traffic environment. A framework is developed that couples the rescheduling tool ROMA with the microscopic simulation model EGTRAIN. Railway traffic is managed for different perturbed scenarios using a rolling horizon scheme where optimal plans are periodically computed based on current traffic information and implemented in the simulation model. The closed-loop setup is investigated for different combinations of its parameters relatively to quality and stability of rescheduling plans. A comparison is performed against a typical open-loop approach that implements only the plan computed on the basis of expected train entrance delays. Both the closed-loop and the open-loop approaches are evaluated against the case in which no rescheduling is considered and trains keep on following the original timetable. Results obtained for the Dutch corridor Utrecht-Den Bosch show that the closed-loop always outperforms the open-loop in terms.
Istnieje wiele dostępnej literatury na temat modeli i narzędzi do optymalnego kierowania ruchem kolejowym w czasie rzeczywistym, ale wiedza na temat ich wpływu na funkcjonowanie jest wciąż nieprecyzyjna i bardzo ograniczona na skutek słabego ich wdrożenia w praktyce. W niniejszej pracy dokonano analizy zachowań opisanych narzędzi przy zastosowaniu ustawień obiegu zamkniętego w realnym środowisku. Opracowano strukturę łączącą narzędzie do zmiany rozkładu jazdy ROMA z mikroskopowym modelem symulacji EGTRAIN. Możliwe jest zarządzanie ruchem kolejowym w sytuacjach różnych zakłóceń ruchu przy użyciu przesuwnego horyzontu, gdzie optymalne plany są wyliczane na podstawie bieżących informacji o ruchu i ładowane do modelu symulacji. Ustawienia obiegu zamkniętego są badane w różnych kombinacjach parametrów w odniesieniu do jakości i stabilności zmienionych rozkładów. Porównanie jest dokonywane względem typowego podejścia z obiegiem otwartym, które wdraża tylko jeden plan, wyliczony na podstawie przewidywanych opóźnień pociągów. Obydwa podejścia są oceniane w porównaniu do przypadku, w którym pociągi poruszają się zgodnie z oryginalnym rozkładem. Rezultaty uzyskane w holenderskim korytarzu Utrecht – Den Bosch wykazały, że zamknięty obieg zawsze sprawdza się lepiej niż obieg otwarty.
Źródło:
Problemy Kolejnictwa; 2015, 168; 39-45
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants
Autorzy:
Wojtaszek, K.
Cebula, F.
Partyka, B.
Deszcz, P.
Włoch, G.
Socha, R. P.
Woźny, K.
Żabiński, Piotr
Wojnicki, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2203711.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper powder
electrochemical synthesis
rotating electrode
ethylene glycol
Opis:
This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 375--386
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Did You Have an Impact? A Theory-Based Method for Planning and Evaluating Knowledge-Transfer and Exchange Activities in Occupational Health and Safety
Autorzy:
Kramer, D. M.
Wells, R. P.
Carlan, N.
Aversa, T.
Bigelow, P. P.
Dixon, S. M.
McMillan, K.
Powiązania:
https://bibliotekanauki.pl/articles/90884.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
knowledge transfer and exchange
evaluation
workplace-based research
musculoskeletal disorders
choroby narządów ruchu
ewakuacja
transfer wiedzy bhp
planowanie
badania naukowe
Opis:
Few evaluation tools are available to assess knowledge-transfer and exchange interventions. The objective of this paper is to develop and demonstrate a theory-based knowledge-transfer and exchange method of evaluation (KEME) that synthesizes 3 theoretical frameworks: the promoting action on research implementation of health services (PARiHS) model, the transtheoretical model of change, and a model of knowledge use. It proposes a new term, keme, to mean a unit of evidence-based transferable knowledge. The usefulness of the evaluation method is demonstrated with 4 occupational health and safety knowledge transfer and exchange (KTE) implementation case studies that are based upon the analysis of over 50 pre-existing interviews. The usefulness of the evaluation model has enabled us to better understand stakeholder feedback, frame our interpretation, and perform a more comprehensive evaluation of the knowledge use outcomes of our KTE efforts.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 41-62
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Gold, Copper and Nickel Adsorption, from their Acidic Chloride Solutions, Onto Activated Carbon
Autorzy:
Wojnicki, M.
Socha, R. P.
Luty-Błocho, M.
Partyka, B.
Polański, M.
Deszcz, P.
Kołczyk, K.
Żabiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/356223.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorption
gold(III) chloride ions
recovery
recycling
Opis:
In this paper, a simple and effective method for gold recovery is described. The paper describes a way to recover gold onto activated carbon from a synthetic solution of gold(III) chloride. The method can also be used on nickel(II) as well as copper(II) chloride of where the metal ion ratios are comparable to the metal ratios found in some electronic waste. With the use of activated carbon in the process of electrolyte purification it is possible to selectively remove gold in metallic form from the solution. XPS studies have confirmed that metallic gold is present on the carbon surface. A spectrophotometric method was used to determine the concentration of Au(III) in the solution. Different concentration of nickel(II) as well as copper(II) were investigated. In all cases, adsorption and reduction of Au(III) to the metallic form was observed.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 73-81
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Actions of several substituted short analogues of porcine galanin on isolated rat fundus strips: a structure-activity relationship
Autorzy:
Korolkiewicz, R.P.
Konstanski, Z.
Rekowski, P.
Ruczynski, J.
Szyk, A.
Grzybowska, M.
Korolkiewicz, K.Z.
Petrusewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/71045.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
gastric fundus
genitourinary tract
peptide
gut
peripheral nervous system
endocrine system
amino acid
smooth muscle
rat
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
No greens in the forest? Note on the limited consumption of greens in the Amazon
Autorzy:
Katz, E.
Lopez, C.L.
Fleury, M.
Miller, R.P.
Paye, V.
Dias, T.
Silva, F.
Oliveira, Z.
Moreira, E
Powiązania:
https://bibliotekanauki.pl/articles/58954.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Źródło:
Acta Societatis Botanicorum Poloniae; 2012, 81, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodological aspects of the quantification of dispersible clay and its relationship with soil properties along a catena under no-till management
Autorzy:
de Paula, A.L.
Giarola, N.F.B.
de Lima, R.P.
Wiecheteck, L.H.
da Silva, A.P.
Powiązania:
https://bibliotekanauki.pl/articles/2082881.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil structure
erodibility
aggregation
Opis:
Continuous no-till management of sloping cultivated areas can promote soil property transformations, causing changes in aggregation and dispersion. The objective of this work was (i) to quantify the readily and mechanically dispersible clays using different methods and (ii) to examine their relationships with soil properties along a catena under no-till management. For this study, the catena was divided into three distinct parts: crest, upper-slope and mid-slope positions. Undisturbed soil cores were sampled at each slope position to determine the following soil properties: organic carbon, Ca2+, Mg2+, K+, Al3+, P, pH, cation exchange capacity and total clay content. Additionally, the levels of readily dispersible clay were measured using turbidimeter and hydrometer methods, whereas mechanically dispersible clay was quantified using the turbidimeter method. We observed high influence of total clay content and organic carbon on soil flocculation; P, Mg2+ and cation exchange capacity were positively related to clay dispersion. Soil management and water transport downslope are probably influencing changes in soil properties and determining the distribution of dispersible clay contents along the catena. No relationships were observed between readily dispersible clay measured using turbidimeter and hydrometer in terms of quantity. Hydrometer and turbidimeter measurements can deliver significantly different results regarding dispersible clay quantification, potentially leading to misinterpretations concerning the amount of clay dispersed in water.
Źródło:
International Agrophysics; 2020, 34, 2; 273-280
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prandial and postprandial exocrine pancreatic secretion after duodenal infusion of alfa-ketoglutarate, formic acid and potassium di-formate in pigs
Autorzy:
Filip, R.
Kruszewska, D.
Valverde Piedra, J.L.
Szymanczyk, S.E.
Studzinski, T.
Radzki, R.P.
Bienko, M.
Pierzynowski, S.G.
Powiązania:
https://bibliotekanauki.pl/articles/3153.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2007, 01, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression on hypoxia-inducible factor-1α in human tegumentary leishmaniosis caused by Leishmania braziliensis
Autorzy:
Rocha, F.J.S.
Pereira, C.L.D.
de Melo, F.L.
Soares, C.R.P.
Paz, S.T.
Giorgio, S.
Powiązania:
https://bibliotekanauki.pl/articles/6320.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 2018, 64, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of instructional materials in physical education to enhance the students’ knowledge and skills in swimming and life-saving techniques
Autorzy:
Germo, R. R.
Sarinas, B. G. S.
Coo, E. C.
Teruñez, M. R.
Gavadan, B. E.
Jardenil, C. Y.
Flores, J.R.P.V.
Powiązania:
https://bibliotekanauki.pl/articles/2172495.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime education and training
physical education
instructional materials
swimming techniques
life saving techniques
bachelor of Science in marine transportation
life saving appliances
Opis:
John B. Lacson Foundation Maritime University (Arevalo), Inc. is mandated to offer aquatic-sports courses such as paddling, rowing, sailing, and swimming to equip students with needed skills essential for survival in case of emergencies. Since, there is a dearth of instructional materials in Physical Education 2 (Advanced Swimming and Life-saving Techniques), the JBLFMU-Arevalo was given a research grant by the CHED (Commission on Higher Education) known as DARE TO (Discovery Applied Research and Extension Trans/Inter-Disciplinary Opportunities) to address the problem. This DARE TO grant aimed to develop instructional materials in PE 2 that will enhance the swimming performance and life-saving techniques of students. That is why the researchers would like to test for the effectiveness of this instructional material in the form of modules over the traditional approach which is lecture in improving the students’ swimming performance and life-saving techniques in terms of their knowledge and skills. This non-equivalent control group under quasi-experimental study was utilized among the BSMT (Bachelor of Science in Marine Transportation) students. A pretest was used to determine swimming performance of the experimental and control groups. An intervention through the use of instructional materials was employed in the experimental group for the whole semester (five months) while the control group was exposed to lecture as a traditional method of instruction. After a semester, the posttest was administered. The statistical tools used were mean, standard deviation, Mann-Whitney test, and Wilcoxon-signed ranks test. The findings of the study revealed that the instructional material is effective in enhancing the swimming performance and life-saving techniques of students both in the aspects of knowledge and skills. Both the experimental and control groups were “Fair” in their knowledge pretest scores but during the posttest, the experimental group was “Good” and the control group was “Fair”. On the other hand, both the experimental and control groups were “Fair” in their skills’ pretest scores but during their posttest, the control group was “Good” while the experimental group was “Excellent”. The experimental group who used the module showed significantly better performance during the posttest both for knowledge and skills compared to the control group who did not use the module (lecture only). The study further showed significant differences in the mean gains between the experimental and control groups after the conduct of pretest and posttest in favor of the experimental group. It can be gleaned from the results that the module can enhance the knowledge and skills in swimming performance and life-saving techniques of the experimental group. It is highly recommended that this module be utilized among maritime schools offering swimming and life-saving courses.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 233--240
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying of Perovskite Nanoparticles in PMMA Matrix Used as Light Converter for Silicon Solar Cell
Autorzy:
Lipiński, M.
Socha, R. P.
Kędra, A.
Gawlińska, K.
Kulesza-Matlak, G.
Major, Ł.
Drabczyk, K.
Łaba, K.
Starowicz, Z.
Gwóźdź, K.
Góral, A.
Popko, E.
Powiązania:
https://bibliotekanauki.pl/articles/356850.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
perovskite nanoparticles
light converters
solar cells
solar energy materials
Opis:
The nanoparticles of CH3NH3PbBr3 hybrid perovskites were synthesized. These perovskite nanoparticles we embedded in polymethyl methacrylate (PMMA) in order to obtain the composite, which we used as light converter for silicon solar cells. It was shown that the composite emit the light with the intensity maximum at about 527 nm when exited by a short wavelength (300÷450 nm) of light. The silicon solar cells were used to examine the effect of down-conversion (DC) process by perovskite nanoparticles embedded in PMMA. For experiments, two groups of monocrystalline silicon solar cells were used. The first one included the solar cells without surface texturization and antireflection coating. The second one included the commercial cells with surface texturization and antireflection coating. In every series of the cells one part of the cells were covered by composite (CH3NH3PbBr3 in PMMA) layer and second part of cells by pure PMMA for comparison. It was shown that External Quantum Efficiency EQE of the photovoltaic cells covered by composite (CH3NH3PbBr3 in PMMA) layer was improved in both group of the cells but unfortunately the Internal Quantum Efficiency was reduced. This reduction was caused by high absorption of the short wavelength light and reabsorption of the luminescence light. Therefore, the CH3NH3PbBr3 perovskite nanoparticles embedded in PMMA matrix were unable to increase silicon solar cell efficiency in the tested systems.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1733-1739
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 3632

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