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Tytuł:
ORGANIZATION OF PROVIDING UNITS AND FORMATIONS WITH MISSILES AND AMMUNITION IN SPECIAL OPERATIONS
Autorzy:
Mussaliev, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/565883.pdf
Data publikacji:
2015
Wydawca:
Akademia Sztuki Wojennej
Źródło:
Obronność – Zeszyty Naukowe Wydziału Zarządzania i Dowodzenia Akademii Sztuki Wojennej; 2015, 1(13); 3
2084-7297
Pojawia się w:
Obronność – Zeszyty Naukowe Wydziału Zarządzania i Dowodzenia Akademii Sztuki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple statistical formulas for estimating biogeochemical properties of suspended particulate matter in the Southern Baltic Sea potentially useful for optical remote sensing applications
Autorzy:
Wozniak, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/47701.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
biogeochemical property
suspended particulate matter
particulate organic carbon
inherent optical property
chlorophyll a
light absorption
backscattering coefficient
remote sensing
Baltic Sea
Źródło:
Oceanologia; 2014, 56, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and development of the leaf blades of Acer tataricum in industrially contaminated environment
Autorzy:
Dineva, S B
Powiązania:
https://bibliotekanauki.pl/articles/41080.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Tatarian maple
Acer tataricum
air pollution
sulphur dioxide
plant growth
plant development
vegetation season
leaf blade
environment pollution
gaseous pollution
Opis:
During one vegetative season, the growth and the development of the leaf blades of Tatarian maple (Acer tataricum L.) from heavily polluted area has been studied. The region under investigation was contaminated mainly with SO2, NxOx, Pb, Zn, and Cu etc. The aim of the study was to compare the growth and the development of the leaf blades of Acer tataricum L. (Tatarian maple) from polluted field with those from non-polluted. Base on this to assess its tolerance to polluted conditions of the atmosphere, as well as to look for adaptive responses. The conducted study registered shorter time of the vegetative growth of the leaf blades in the commencement stages of the vegetative development. The leaves from polluted site had emergence approximately two weeks earlier compared with these from the control area. Faster linear growth of the leaf surfaces in the commencement stages of the development had been noted for the trees from polluted field. The spongy mesophyll had been reduced, as well as the common thickness of the leaf blades of the tree plants from the contaminated region. The observed changes are regarded as adaptation of the plant to the polluted environment, i.e. as tolerance.
Źródło:
Dendrobiology; 2005, 54; 3-10
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaf blade structure and the tolerance of Acer negundo L. (box elder) to the polluted environment
Autorzy:
Dineva, S B
Powiązania:
https://bibliotekanauki.pl/articles/41089.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
polluted air
polluted environment
sulphur dioxide
stress factor
box-elder
Acer negundo
industrial emission
environment pollution
leaf blade structure
stress tolerance
Opis:
Polluted air is a stress factor that contributes to the decline of urban trees. Air pollution may cause short-term (acute) damage, which is immediately visible and long-term (chronic) damage, which can lead to gradual tree decline. Long-term damage may predispose trees to other disorders. The impact of technogenic factors on the leaf’s anatomical structure of Acer negundo L. (Box elder) was studied. The thickness of the upper cuticle is increased when compared to those from an ecologically pure area. A change in the rate of mesophyll tissue is due to the enlargement of the palisade parenchyma. The thickness of lower epidermal cells is decreased. All changes of the leaf blade structure are significant and are in direction of increasing the xerophyte characteristics of the leaves. Box elder is native to much of temperate North America. This is a tree of lowlands and wet hardwood forests. As such, we can assume that the registered changes are adaptive responses of the tree to the contaminated environment and that the tree can be considered to be relatively tolerant.
Źródło:
Dendrobiology; 2005, 53; 11-16
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the leaf blades of Acer platanoides in industrially contaminated environment
Autorzy:
Dineva, S B
Powiązania:
https://bibliotekanauki.pl/articles/41665.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Norway maple
Acer platanoides
leaf blade
air pollution
sulphur dioxide
environment pollution
industrial pollution
industrially contaminated air
Opis:
Leaf blades of Norway maple (Acer platanoides L.), growing in heavily polluted industrial area have been studied for anatomical changes developed under the influence of the industrial contamination (with SO2, NxOx, Pb, As). The aim of the examination was to reveal the dynamics in the development of leaf blades and to trace the impact of the contaminated air on the leaf structure of Norway maple. The conducted study registered acceleration of the vegetative growth of the leaf blades that is manifested through approximately two weeks earlier appearance of leaves on the tree, faster linear growth and strengthened the xeromorphic traits in the leaf structure of the tree plants from the contaminated region. The observed changes are regarded as adaptation of the plant to the polluted environment, i.e. as tolerance.
Źródło:
Dendrobiology; 2006, 55; 25-32
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies of the leaf morphology and structure of white ash Fraxinus americana L. and London plane tree Platanus acerifolia Willd growing in polluted area
Autorzy:
Dineva, S B
Powiązania:
https://bibliotekanauki.pl/articles/41005.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
white ash
Fraxinus americana
London planetree
Platanus acerifolia
leaf
industrial area
industrial pollution
heavy polluted industrial area
air pollution
leaf morphology
leaf structure
leaf anatomy
environment pollution
Opis:
The leaf blades of white ash Fraxinus americana L. and London plane tree Platanus acerifolia Willd. growing in heavy polluted industrial areas were studied for morphological and anatomical changes developed under the influence of industrial contamination. The aim of the investigation was to determine and compare the influences of air polluted with SO2, NxOx, Pb, As, Zn, Cu etc. on the morphology and the structure of the leaves of these deciduous trees. Both species are tolerant to environmental changes but with different environmental characteristics and tolerances and they are widely used for planting. Under polluted conditions, the trees strengthened the anatomic xeromorphic characteristics of their leaf structures, which gave them the opportunity to mitigate the stressful conditions of the environment. The observed responses are regarded as adaptive and compensative to the adverse effects of air pollution.
Źródło:
Dendrobiology; 2004, 52; 3-8
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulmonary tuberculosis in childhood: clinical features, treatment side effects and factors associated with radiologic improvement
Autorzy:
Batmaz, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/2088011.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
child
prognosis
pulmonary
radiological
tuberculosis
Opis:
Background: Tuberculosis (TB) is a common public health problem and early diagnosis and treatment is important. Aim of the study: The aim was to evaluate complaints and radiological features, drug side effects, changes in radiological findings after treatment, and to evaluate the factors affecting this change in patients with pulmonary TB. Material and methods: One hundred patients with pulmonary TB were evaluated, and the following data recorded: age, gender, contact with TB patient, complaints, physical examination, tuberculin skin test, acid resistant bacillus, polymerase chain reaction and culture results, posteroanterior/lateral chest radiographs and thorax computed tomography findings at presentation and after treatment, treatment duration, and side effects. Treatment adherence and follow-up data were evaluated, and radiological findings before and after treatment were compared. In predicting radiological improvement, the effects of age, sex, duration of complaints, living in in rural/urban areas, treatment duration, treatment adherence, follow-up, and presence of cavitation were examined. Results: Mean age was 6.0 ± 4.2 years. 66 of the patients had contact history with TB patients. The most common complaint was cough, whilst infiltration and/or mediastinal lymphadenopathy were the most common findings in radiological examination at presentation. 84 patients were scheduled a treatment program for 6 months. Improvement in radiological findings were significantly better in patients who adhered to medication and follow-up protocols. Age, sex, complaint duration, living in rural/urban areas, treatment duration and presence of cavitation were not significantly associated with radiological improvement. Conclusions: Pulmonary TB should be considered in patients presenting with cough, even if their physical examination and chest radiographs are normal. Adherence to anti-tuberculosis treatment and follow-up were the most important factors in radiological improvement.
Źródło:
Medical Science Pulse; 2020, 14, 1; 4-9
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A distribution associated with the Kontorovich-Lebedev transform
Autorzy:
Yakubovich, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/254983.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Kontorovich-Lebedev transform
distributions
modified Bessel functions
Opis:
We show that in a sense of distributions [formula], where δ is the Dirac distribution, τ, x ∈ R and Kν(x) is the modified Bessel function. The convergence is in E'(R) for any even varphi(x) ∈ E(R) being a restriction to R of a function varphi(z) analytic in a horizontal open strip Ga = {z ∈ C: |Im z| < a, a > 0} and continuous in the strip closure. Moreover, it satisfles the condition [formula], |Re z| → ∞, α > 1 uniformly in ‾Ga. The result is applied to prove the representation theorem for the inverse Kontorovich-Lebedev transformation on distributions.
Źródło:
Opuscula Mathematica; 2006, 26, 1; 161-172
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A double index transform with a product of Macdonalds functions revisited
Autorzy:
Yakubovich, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/255241.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Macdonald function
index transforms
Kontorovich-Lebedev transform
double Mellin transform
Plancherel theorem
Parseval equality
Opis:
We prove an inversion theorem for a double index transform, which is associated with the product of Macdonald's functions Kiτ (√x(2)+y(2)-y) Kiτ (√ x(2)+y(2)+y), where (x, y) ∈ R(+) x R(+) and iτ, τ ∈ R(+) is a pure imaginary index. The results obtained in the sequel are applied to find particular solutions of integral equations involving the square and the cube of the Macdonald function K(iτ) (t) as a kernel.
Źródło:
Opuscula Mathematica; 2009, 29, 3; 313-329
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Beurlings theorems and inversion formulas for certain index transforms
Autorzy:
Yakubovich, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/255306.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Beurling theorem
Kontorovich-Lebedev transform
Lebedev-Skalskaya transforms
Fourier transform
Laplace transform
modified Bessel functions
uncertainty principle
Nicholson function
Opis:
The familiar Beurling theorem (an uncertainty principle), which is known for the Fourier transform pairs, has recently been proved by the author for the Kontorovich-Lebedev transform. In this paper analogs of the Beurling theorem are established for certain index transforms with respect to a parameter of the modified Bessel functions. In particular, we treat the generalized Lebedev-Skalskaya transforms, the Lebedev type transforms involving products of the Alacdoriald functions of different arguments and an index transform with the Nicholson kernel function. We also find inversion formulas for the Lebedev-Skalskaya operators of an arbitrary index and the Nicholson kernel transform.
Źródło:
Opuscula Mathematica; 2009, 29, 1; 93-110
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wysokiej temperatury na charakterystykę pękania zaczynu, zaprawy i betonu
The effects of temperature on breaking slurry, mortar and concrete
Autorzy:
Plechawski, S.
Fic, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/163123.pdf
Data publikacji:
2018
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
kompozyt cementowy
zaczyn cementowy
zaprawa cementowa
beton
warunki pożarowe
oddziaływanie wysokiej temperatury
właściwości wytrzymałościowe
pękanie
cement composite
cement slurry
cement mortar
concrete
fire conditions
high temperature impact
strength properties
cracking
Opis:
W artykule przedstawiono zagadnienia wpływu wysokich temperatur na kompozyty cementowe: zaczyn, zaprawę i beton. Składy badanych kompozytów nie zawierały żadnych dodatków ani domieszek. Kompozyty badano m.in. na ściskanie, rozciąganie przy zginaniu i przy rozłupywaniu oraz odporność na pękanie, określając ich krytyczny współczynnik intensywności naprężeń KIC. Istotą artykułu są wzajemne relacje odporności na pękanie badanych kompozytów po aplikacji temperatur pożarowych.
This paper presents the results of research on the effects of high temperatures on cement composites, such as: slurry, mortar and concrete. The compositions of the tested elements did not contain any additions or admixtures. Composites were tested based on their bending tensile and compression strength and crack resistance determining their critical stress intensity index (KIC). The purpose of this paper is to show mutual relations of crack resistance between the tested composites in extreme temperatures.
Źródło:
Przegląd Budowlany; 2018, 89, 9; 16-21
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostics of concrete elements after the fire
Diagnostyka elementów betonowych po pożarze
Autorzy:
Plechawski, S.
Fic, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/402539.pdf
Data publikacji:
2018
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
diagnostics
fire temperatures
damage
cracks
fractures
non-destructive testing
destructive testing
strength
dynamic modulus of elasticity
stress intensity factor
diagnostyka
temperatury pożarowe
uszkodzenia
zarysowania
spękania
badania nieniszczące
badania niszczące
wytrzymałość
dynamiczny moduł sprężystości
współczynnik intensywności naprężeń
Opis:
The paper presents selected methods for determining the influence of fire on the load capacity of concrete elements - diagnostics and damages arising after application of fire temperatures. The subject may not seem new in terms of the well-known drop in the strength of concrete in fire conditions, but an important aspect discussed in the paper is the fracture toughness of concrete depending on high temperatures. Destructions, caused by fire temperatures, affects the physical and mechanical properties of concrete, and their size can be assessed using the stress intensity factor. According to our own research, the critical stress intensity factor KIC of concrete decreases faster than the dynamic modulus of elasticity, and also faster than compressive and tensile strength. The paper describes selected methods of diagnostics of construction elements from concrete damaged by fire.
W referacie przedstawiono wybrane metody określania wpływu pożaru na nośność elementów betonowych - diagnostykę oraz uszkodzenia powstające po aplikacji temperatur pożarowych. Temat może nie wydaje się nowy w aspekcie, powszechnie znanego spadku wytrzymałości betonu w warunkach pożarowych, jednak istotnym zagadnieniem poruszonym w referacie jest odporność betonu na pękanie w zależności od wysokich temperatur. Destrukcje powstałe pod wpływem temperatur pożarowych wpływają na właściwości fizykomechaniczne betonu, a ich wielkość może być oceniana za pomocą współczynnika intensywności naprężeń. Z badań własnych wynika, że krytyczny współczynnik intensywności naprężeń KIC betonu zmniejsza się szybciej niż dynamiczny moduł sprężystości Edyn, a także szybciej niż wytrzymałość na ściskanie i rozciąganie. W referacie opisano wybrane metody diagnostyki elementów konstrukcyjnych z betonu, uszkodzonych przez pożar.
Źródło:
Structure and Environment; 2018, 10, 3; 223-236
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed certificate authority in cluster-based manet using multi secret sharing scheme
Autorzy:
Azza, M
Hacene, S B
Powiązania:
https://bibliotekanauki.pl/articles/101930.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
secret sharing scheme
clustering
mobile ad hoc network
overdetermined system
linear equations
Galois fields
certificate authority
Opis:
Providing secure communications in mobile ad hoc networks (MANET) is an important and difficult problem, due to a lack of a key management infrastructure. The authentication is an important security service in (MANETs). To provide a node authentication service we use a fully distributed certificate authorities (FDCA) based on the threshold cryptography. In this paper we propose an efficient and verifiable multi secret sharing scheme in cluster-based MANET with a low computation system. Our scheme is based on the overdetermined linear system equation in Galois fields GF(2r). We have analyzed our scheme based on security and performance criteria, and compared with existing approaches. The efficiency of our proposed schemes was verified and evaluated by simulation. Simulation results show that this approach is scalable.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 1-9
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uszkodzenia budynku mieszkalno-usługowego o konstrukcji tradycyjnej
Damage to a residential and service building with a traditional structure
Autorzy:
Fic, S. B.
Plechawski, S.
Powiązania:
https://bibliotekanauki.pl/articles/163422.pdf
Data publikacji:
2012
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
budynek mieszkalno-usługowy
budynek zabytkowy
technologia tradycyjna
dobudowa
uszkodzenie
metoda naprawy
residential and service building
monument
traditional technology
redevelopment
damage
repair method
Opis:
W niniejszym artykule przedstawiono uszkodzenia, jakie powstały w budynku mieszkalno-usługowym o konstrukcji tradycyjnej, zlokalizowanym w obrębie strefy zabytkowej w centrum miasteczka powiatowego na Lubelszczyźnie. Budynek pochodzi z lat 20. XIX wieku i do opisanych tu uszkodzeń doszło głównie podczas jego wieloletniej eksploatacji, w trakcie której wykonano m. in. dobudowę obiektu handlowego w 2005 r. oraz nielegalną dobudowę klatki schodowej w 2009 r., częściowo posadowioną na fundamentach istniejącego budynku. W artykule opisano też metody wzmocnień i naprawy uszkodzonych elementów konstrukcyjnych obiektu. W świetle niekończącej się dyskusji dotyczącej definicji awarii i katastrofy budowlanej przedstawione tu spektrum uszkodzeń budynku sugeruje pytanie: czy jest to dopiero stan przedawaryjny, czy już przedkatastrofalny?
This article describes damage to a residential and service building of traditional structure, located in the historic centre of a medium-sized town in the Lublin region. The building dates from the 1820s, and the damage described here has arisen mainly during its many years of utilization, during which, among other things, an shop extension was built on in 2005, and a staircase was added illegally in 2009, supported partly by the foundations of the existing building. The article also describes the methods used to reinforce and repair the damaged structural elements of the building. In the light of the continuing discussion concerning the definitions of building malfunctions and disasters, the question arises in relation to the spectrum of damage described here: is this building in a state which merely threatens malfunction, or one that threatens disaster?
Źródło:
Przegląd Budowlany; 2012, R. 83, nr 11, 11; 36-42
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary comparison between various models of the long-wave radiation budget of the sea and experimental data from the Baltic Sea
Autorzy:
Zapadka, T.
Wozniak, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/47985.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
infrared radiation
atmosphere
sea
long-wave radiation
sea surface
Baltic Sea
Opis:
This paper discusses existing models of long-wave radiation exchange between the sea surface and the atmosphere, and compares them with experimental data. The latter were based on empirical data collected in the southern Baltic during cruises of r/v ‘Oceania’. To a greater or lesser extent, all the models were encumbered with significant systematic and statistical errors. The probable reasons for these discrepancies are given.
Źródło:
Oceanologia; 2000, 42, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fraction of Positronium Formation at Semiconductor Surface
Autorzy:
Shrivastava, S. B.
Upadhyay, A.
Powiązania:
https://bibliotekanauki.pl/articles/2010960.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
68.35.Fx
Opis:
The fraction of positronium formation (f$\text{}_{ps}$) has been calculated in Ge(110), Ge(111), Si(110) and Si(111) surfaces by solving the diffusion equation for positrons in semiconductors and by setting up the rate equation to describe the processes that are supposed to occur when a thermalised positron encounters the surface including the trapping of positrons in neutral and negative vacancies. Certain parameters used in the evaluation of f$\text{}_{ps}$, e.g., the bulk annihilation rate (λ$\text{}_{s}$), the positron diffusion length (L$\text{}_{+}$), the diffusion coefficient (D$\text{}_{+}$) and the implantation profile parameter (A), have been taken from the experiments. The calculated values of f$\text{}_{ps}$ as a function of incident positron energy and temperature in Ge(110) and Si(111) have been compared with the experimental results. It has been found that in general the calculated results are in good agreement with the experimental ones. The calculation also confirms that the trapping rate of positrons into negative vacancy has a T$\text{}^{-1}\text{}^{/}\text{}^{2}$ dependence with respect to the temperature.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 1005-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Floral morphology and HPTLC fingerprint profile of Saraca asoca (Roxb.) De Wilde (Caesalpiniaceae): A consecrated tree of India
Autorzy:
Mishra, S.B.
Vijayakumar, M.
Powiązania:
https://bibliotekanauki.pl/articles/11140.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Pharmacognosy of the flowers of Saraca asoca (Roxb.) De Wilde has been carried out to lay down standards for the genuine drug Ashoka with the detailed anatomy of various floral appendages. The aim of the present study is to determine the physico-chemical profile, preliminary phytochemical screening, fluorescence analysis and chemical composition by HPTLC of the medicinally important plant Saraca asoca. These observations would be of immense value in the botanical identification and standardization of the drug in crude form. This study would help distinguish the drug from its other species.
Źródło:
International Letters of Natural Sciences; 2015, 43
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic approximations to the non-isothermal distributed activation energy model for bio-mass pyrolysis
Autorzy:
Dhaundiyal, A.
Singh, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/386522.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
biomass pyrolysis
distributed activation energy model (DAEM)
DAEM
non-isothermal kinetics
gamma distribution
asymptotic expansion
erlang distribution
Opis:
This paper describes the influence of some parameters significant to biomass pyrolysis on the numerical solutions of the non-isothermal nth order distributed activation energy model (DAEM) using the Gamma distribution and discusses the special case for the positive integer value of the scale parameter (), i.e. the Erlang distribution. Investigated parameters are the integral upper limit, the frequency factor, the heating rate, the reaction order, and the shape and rate parameters of the Gamma distribution. Influence of these parameters has been considered for the determination of the kinetic parameters of the non-isothermal nth order Gamma distribution from the experimentally derived thermoanalytical data of biomass pyrolysis. Mathematically, the effect of parameters on numerical solution is also used for predicting the behaviour of the unpyrolysized fraction of biomass with respect to temperature. Analysis of the mathematical model is based upon asymptotic expansions, which leads to the systematic methods for efficient way to determine the accurate approximations. The proposed method, therefore, provides a rapid and highly effective way for estimating the kinetic parameters and the distribution of activation energies.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 4; 293-301
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A radial version of the Kontorovich-Lebedev transform in the unit ball
Autorzy:
Yakubovich, S. B.
Vieira, N.
Powiązania:
https://bibliotekanauki.pl/articles/255671.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Kontorovich-Lebedev transform
modified Bessel function
index transforms
Fourier integrals
Opis:
In this paper we introduce a radial version of the Kontorovich-Lebedev transform in the unit ball. Mapping properties and an inversion formula are proved in Lp.
Źródło:
Opuscula Mathematica; 2011, 31, 1; 137-146
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Establishing the Relationship Between Learner Profile and Retention of Learning: A Case of Adult Literacy Program in India
Autorzy:
Bohra, N S
Joshi, S B
Powiązania:
https://bibliotekanauki.pl/articles/1967768.pdf
Data publikacji:
2019-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
retention of learning
adult literacy
Opis:
The aim of this study is to examine the relationship between learner profile and retention of learning in adult education programs in India. To achieve the objective, learner profile was divided into three measuring factors as social, economic and learning factors. A survey method was used to collect the required data. A testing method was executed to examine the retention level of learners. Factors responsible for the retention of learner profile were further analyzed with the use of a statistical technique (ANOVA). Results of the study show that the economic factors of learner profile have an impactful relationship with the retention level but customized contents of relevant study material with sustainable infrastructural facilities of learning centers can maximize the retention level of learners of such programs.
Źródło:
The New Educational Review; 2019, 55; 195-207
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of water cycle components in the Narmada River basin by forcing SWAT model with CFSR data
Autorzy:
Goswami, S. B.
Kar, S. C.
Powiązania:
https://bibliotekanauki.pl/articles/108560.pdf
Data publikacji:
2018
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
hydrologia
dane
CFSR
symulacja
cykl
dorzecze
rzeka Narmada
hydrology
water cycle
SWAT
CFSR data
Opis:
In the present study, an attempt has been made through a hydrological model (SWAT – Soil and Water Assessment Tool) to simulate water cycle components over the Narmada river basin, one of the largest rivers in the Indian peninsula. The model was forced with observed as well as CFSR rainfall data to calibrate surface runoff simulated by the model. The spatial and temporal variability of the water cycle components were examined by running the SWAT model for 30 years (1984-2013) at a daily time-scale using CFSR precipitation, temperature, humidity, winds and solar radiation. It was found that there are large variations in hydrological parameters simulated by the model from sub-basin to sub-basin and year to year. During the monsoon seasons, surface runoff is maximum but during other seasons, almost no surface runoff is seen as there is almost no rain. Groundwater increase is seen after about 1 month of rainfall peaks in the basin. Evapotranspiration has two peaks, one in March-April and the other in August. Much less evaporation takes place in the basin in the month of May. These components (other than surface runoff) are also sensitive to climatic forcing (winds, relative humidity and solar radiation in addition to temperature and rainfall) applied. Evapotranspiration increases when all the climatic parameters are used, which then reduces the water availability on the surface for percolation and groundwater recharge. However, rainfall is the key parameter which decides the hydrology in the Narmada basin. The SWAT model has been able to compute water balance at basin and sub-basin scales.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2018, 6, 1; 13-25
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation conditions and nonlinear sound directed propagation in inhomogeneous medium
Autorzy:
Perelomova, A. A.
Leble, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/332598.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Boundary (and initial) conditions choice for the effective generation and propagation of nonlinear sound in a stratified medium is studied. The adjustment to a medium type is introduced via a choice of equations of state. Liquid, liquid with bubbles and gas cases are considered. Model propagation equations are derived for the special cases of plane directed waves. The application of the conditions in two-dimensional version (three-dimensional with the cylindric symmetry) is discussed and some test calculations of solutions are performed numerically. A good shape and direction conservation in a weak nonlinear conditions is discovered for a triangular initial wave from low frequency range.
Źródło:
Hydroacoustics; 1997, 1; 89-94
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructured CdO thin films for LPG and CO2 gas sensor prepared by spray pyrolisis technique
Autorzy:
Bari, R. H.
Patil, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/411726.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
spray pyrolysis techniques
LPG
CO2 sensor
nanostructured CdO
gas response
Opis:
Nanostructured CdO thin films were deposited by spray pyrolysis techniques at different spray deposition time on glass substrates. Nanostructured CdO thin films was prepared using 0.05 M of cadmium acetate dehydrate (CH3COO) 2Cd•2H2O) was dissolved in the deionised water. These thin films were annealing in air at temperatures 500 °C for 60 min. The thickness of the films, crystallite and grain size were observed to increase with the increase in spray deposition time. As prepared thin films were characterized using XRD, FE-SEM and EDAX. The XRD analysis shows that CdO films were cubic structured. The electrical and gas sensing properties of these films were investigated. Prepared nanostructure CdO thin films show LPG (S = 1600) and CO2 (S = 435) gas response at different operating temperature. Gas response, selectivity, response and recovery time of the sensor were measured and presented.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 18; 31-46
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-adaptive whale optimization for the design and modelling of boiler plant
Autorzy:
Savargave, S. B.
Deshpande, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1839098.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
boiler
whale optimization
neural model
temperature outlet
feed water flow
Opis:
Recently, boiler plants are have been the subject of intensive investigations in the context of energy-saving technologies and management for power saving and reduction of emissions. Modern boiler design offers several benefits with this respect. In the past, improper design of boilers has been the cause of explosions which led to the loss of life and property. Modern designs attempt to avoid such mishaps. This paper presents a novel Self-Adaptive Whale Optimization Algorithm (SAWOA) for improving the learning characteristic of the neural network, the major intention being to model the characteristics of the boiler plant and so to effectively predict the boiler behaviour. The performance analysis of the introduced model has been carried out using the three test cases with consideration of several parameters. In the experimental analysis, the introduced technique is compared with the existing ones, based on such approaches as Neural Model (NM), Firefly (FF-NM), Adaptive Firefly NM (AFF-NM), and Whale Optimization Algorithm-NM (WOANM). In this comparison, the error, i.e. the difference between the actual and the predicted value, was used, and the results revealed that the error is lower for the introduced technique under different experimental scenarios. The experimental results demonstrate that the performance level of SAWOA is by 18% better than those of NM, FF-NM, and AFF-NM, and by 3.74% better than that of WOA-NM. This confirms the quality of performance of the proposed approach regarding boiler plants.
Źródło:
Control and Cybernetics; 2018, 47, 4; 329-356
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cold Zone Exploration Using Position of Maximum Nusselt Number for Inclined Air Jet Cooling
Autorzy:
Ingole, S. B.
Sundaram, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/139691.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
jet impingement
inclined jet
cold zone
air jet cooling
uderzenie strumienia
strumień nachylony
strefa zimna
chłodzenie strumieniem powietrza
Opis:
Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a jet on the leading edge and investigated for downhill side cooling to identify cold spots. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20 000 is examined with a circular jet for inclination (θ) of 15 less than θ less than 75 degree. Also, the consequence of a jet to target distance (H) is explored in the range 0.5 ≤ H/D ≤ 6.8. For 45 degree jet impingement, the maximum Nusselt number is widely spread. Location of maximum Nusselt number is studied, which indicates cold spots identification. At a higher angle ratio, the angle is the dominating parameter compared to the Reynolds Number. Whereas at a lower angle ratio, the inclined jet with a higher Reynolds number is giving the cooling point away from leading edge. It is observed that for a particular angle of incident location of maximum Nusselt Number, measured from leading edge of target, is ahead than that of stagnation point in stated conditions.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 4; 533-549
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of empirical equations for seepage estimation in comparison with observed losses from irrigation canals
Autorzy:
Syed, Naeem S.B
Shuqi, Zhao
Powiązania:
https://bibliotekanauki.pl/articles/27312639.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
empirical equation
equation modification
seepage estimation
seepage loss
seepage rate
Opis:
This study analyses and presents a technical comparison of seepage estimation from 11 empirical equations with measured seepage losses by the inflow-outflow method from two lined and unlined secondary irrigation canals sub-divided into different reach lengths. A significant margin of error was observed between empirical and inflowoutflow methods, hence modifications in empirical equations were performed. Results reveal that the average seepage losses observed in unlined and lined canals by inflow-outflow method were 9.15 and 3.89%, respectively. Moreover, only the Chinese equation estimated seepage losses for an unlined canal as similar to observed losses (0.11 m3 ∙s-1) whereas the Indian equation estimated similar results for a lined canal to those observed in the field (0.09 m3∙s-1). However, the rest of empirical equations were modified in accordance with error percentage with regard to the observed losses. The empirical equations were then observed to estimate reliable results of seepage.
Źródło:
Journal of Water and Land Development; 2023, 57; 21--29
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Optical Properties of CuInSe$\text{}_{2}$ Thin Films
Autorzy:
Fouad, S. S.
Youssef, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/1920947.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.65.-s
81.40.Tv
Opis:
The optical constants of vacuum deposited CuInSe$\text{}_{2}$ thin films of different thicknesses (60-135 nm) were determined in the photon energy from 1.03 to 3.1 eV. It was found that both the refractive index n and the absorption index k are independent of the film thickness. The analysis of the experimental points of the refractive index revealed the existence of normal dispersion and fits Sellmeier dispersion formula for single oscillator model. Using the previous model the optical dielectric constant as well as the oscillator energy and dispersion parameter have been calculated. CuInSe$\text{}_{2}$ is found to be a direct gap semiconductor with a gap energy of 1.03 eV. At energies well above the absorption edge, the absorption behaviour can be explained by the existence of a forbidden direct transition with the same direct energy gap and an indirect one with energy gap of 0.85 eV.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 495-501
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium Fraction and Positron Life Time at Ni(110) and Ge(110) Surfaces
Autorzy:
Shrivastava, S. B.
Gupta, V. K.
Powiązania:
https://bibliotekanauki.pl/articles/1887749.pdf
Data publikacji:
1991-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
25.30.Hm
Opis:
The fraction of positronium formation and the positron lifetime at Ni(110) and Ge(110) surfaces, when low-energy positrons incident on them, have been calculated using the rate equations approach and positron trapping in image potential well. The calculated results are compared with the available experimental results. The positronium fraction is overestimated at high temperatures in case of Ni(110).
Źródło:
Acta Physica Polonica A; 1991, 79, 6; 853-859
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on spray pyrolised nanostructured SnO2 thin films for H2 gas sensing application
Autorzy:
Bari, R. H.
Patil, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/411918.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Spray Pyrolysis
Nanostructured SnO2
thin films
H2 gas sensor
Microstrain
Electrical conductivity
Opis:
The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrophotometer (EDAX). The information of crystallite size, dislocation density and microstrain is obtained from the full width-at half- maximum (FWHM) of the diffraction peaks. Effect of sprayed deposition temperature on H2 gas sensing performance and electrical properties were studied using static gas sensing system. The sensor (Tpyr. = 350 °C) showed high gas response (S = 1200 at 350 °C) on exposure of 500 ppm of H2 and high selectivity against other gases The results are discussed and interpreted.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 125-141
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simple formula for the net long-wave radiation flux in the Southern Baltic Sea
Autorzy:
Zapadka, T.
Wozniak, S.B.
Wozniak, B.
Powiązania:
https://bibliotekanauki.pl/articles/47670.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
statistical error
infrared radiation
Batlic Region
sea surface
Baltic Sea
long-wave radiation
atmosphere
Opis:
This paper discusses problems of estimating the net long-wave radiation flux at the sea surface on the basis of easily measurable meteorological quantities (air and sea surface temperatures, near-surface water vapour pressure, cloudiness). Empirical data and existing formulae are compared. Additionally, an improved formula for the southern Baltic region is introduced, with a systematic error of less than 1 W m−2 and a statistical error of less than 20 W m−2.
Źródło:
Oceanologia; 2001, 43, 3; 265-277
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The intersection graph of annihilator submodules of a module
Autorzy:
Pejman, S. B.
Payrovi, Sh.
Babaei, S.
Powiązania:
https://bibliotekanauki.pl/articles/255039.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
prime submodule
annihilator submodule
intersection annihilator graph
Opis:
Let R be a commutative ring and M be a Noetherian R-module. The intersection graph of annihilator submodules of M, denoted by GA(M) is an undirected simple graph whose vertices are the classes of elements of [formula], for a, b ∈ R two distinct classes [a] and [b] are adjacent if and only if [formula]. In this paper, we study diameter and girth of GA(M) and characterize all modules that the intersection graph of annihilator submodules are connected. We prove that GA(M) is complete if and only if ZR{M) is an ideal of R. Also, we show that if M is a finitely generated R-module with [formula] and [formula] and GA(M) is a star graph, then r(AnnR(M)) is not a prime ideal of R and [formula].
Źródło:
Opuscula Mathematica; 2019, 39, 4; 577-588
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An evaluation of turbulence model for vortex breakdown detection over delta wing
Autorzy:
Wibowo, S. B.
Sutrisno, -
Rohmat, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/949942.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turbulence models
vortex breakdown
delta wing
vortex core
computational fluid dynamics
CFD
roll-up vortex
modele turbulencji
awaria wirowa
skrzydło delta
rdzeń vortex
obliczeniowa mechanika płynów
wir zawijający
Opis:
An important phenomenon of delta wing is the mechanism of vortex core, which indicates the increase in lifting force until the occurrence of the vortex breakdown. The computational fluid dynamics (CFD) is very helpful in visualizing and providing analysis of the detailed data. The use of turbulent models will affect the quality of results in obtaining the vortex breakdown phenomenon. This study used several models of turbulence to capture the occurrence of vortex breakdown and compare it with experiments using water tunnel test facility. The results show that all turbulence models give good results at a low angle of attack (AoA), but at a high AoA the DES model gives the results closest to experimental ones with Cl error value of about 1 %. Taking into account the time required and the acceptable level of accuracy, the use of SST and k-ω models is an alternative option for use in the detection of vortex breakdown.
Źródło:
Archive of Mechanical Engineering; 2018, LXV, 3; 399-415
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors influencing construction Stakeholders’ engagement outcome in Nigeria
Autorzy:
Ekung, S.B.
Okonkwo, E.
Odesola, I.
Powiązania:
https://bibliotekanauki.pl/articles/11878.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
As a result of an increasing cases of community protest and opposition to construction projects in the Niger Delta during the construction stages, the present study investigated factors influencing construction stakeholders‟ engagement outcome. The aim was to determine the severity of factors influencing construction stakeholders‟ engagement in the research environment. Due to the pluralist usage of the term stakeholder, the study examined community stakeholders. Qualitative and quantitative data were collected using semi-structured interview and questionnaire survey administered on 186 respondents selected from two stakeholders groups using snowballing. 32 factors generated individually and collectively from literature, interview and practice were ranked and analysed using descriptive and inferential statistics. Gap between regulatory requirements and public expectations, location of projects, effect of cumulative development effects, poverty, and lack of information disclosure are some of the high ranking factors influencing engagement performance. Further analysis involving Levene‟s Homogeneity test indicates no significant difference in the population ranking opinion of these factors. This heterogeneous distribution demonstrates strong similarity across the population studied. These factors must therefore be smoothened in future construction engagement process to enhance successful project delivery. The study unveils inherent lacunas in construction project management which strongly correlates project performance.
Źródło:
International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The estimation ot virial coefficients via the third harmonics measurements
Autorzy:
Leble, S. B.
Zachariasz, K.
Vereshchagina, I. S.
Powiązania:
https://bibliotekanauki.pl/articles/332193.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The derivation of the next nonlinear term of the KZK equation is done within original perturbation scheme on the base of the virial expansion for thermic equation of state. We also derived equations for second and third harmonic components in the nearfield of the sound wave generated by a piston transducer. Calculation scheme for a numerical estimation of the integrals for the fundamental and second harmonics is proposed as well as for the averaged third harmonic component. Some results of performed calculations are given for the illustration of the method possibility and comparison with direct finite difference solutions of the KZK equation.
Źródło:
Hydroacoustics; 1997, 1; 83-88
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable-Weight Optical Code Division Multiple Access System using Different Detection Schemes
Autorzy:
Seyedzadeh, S.
Moghaddasi, M.
Anas, S. B. A.
Powiązania:
https://bibliotekanauki.pl/articles/308681.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
AND detection
direct detection
QoS differentiation
spectral amplitude coding
variable-weight OCDMA
Opis:
In this paper a Variable Weight OCDMA (VW-OCDMA) system using KS code with Direct Decoding (DD), Complementary Subtraction (CS) and AND subtraction detections is proposed. System performance is analyzed using mathematical approximation and software simulation. In mathematical analysis, the eects of Phase-Induced Intensity Noise, shot noise and thermal noise are taken into account. Bit Error Rate of dierent users is plotted as a function of received optical power per chip with varying the bit rates and number of active users. It has been shown that for dierent bit rates and number of users, system using DD has better performance than the system applying CS and AND detection. Using DD scheme, the number of active users are 100 while this value is 27 and 25 in case of using CS and AND detection, respectively, when the received optical power per chip is -10 dBm.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 3; 50-59
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of nonlinear constants from results of acoustic measurements. Regularization of problem
Autorzy:
Leble, S. B.
Vereshchagin, D. A.
Vereshchagina, I. S.
Powiązania:
https://bibliotekanauki.pl/articles/332067.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
acoustic measurements
regularization
Opis:
The method of nonlinear constants B/A and C/A determination is discussed. It bases on comparison of experimental results of acoustic signal propagation with results of theoretical investigation of this problem. It is shown, that this problem, in general case, is ill-posed. So we use methods of ill-posed problem solution regularization. The values of the constants, which were extracted using this method, are in good accordance with estimations by other authors.
Źródło:
Hydroacoustics; 2003, 6; 159-166
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite-time stability and stabilization of singular state-delay systems using improved estimation of a lower bound on a Lyapunov-like functional
Autorzy:
Stojanovic, S. B.
Debeljkovic, D. Lj.
Antic, D. S.
Powiązania:
https://bibliotekanauki.pl/articles/200145.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
singular systems
time-delay
LMIs
finite-time stability
stabilizing controllers
cone complementarity
linearization
cone complementarity linearization algorithm
systemy pojedyńcze
czas opóźnienia
stabilność w czasie skończonym
kontrolery stabilizujące
komplementarność
linearyzacja
algorytm cone complementarity linearization
Opis:
In this paper, the problems of finite-time stability and stabilization for a class of singular time-delay systems are studied. Using the Lyapunov-like functional (LLF) with (exponential or power) weighting function and a new estimation method for the lower bound on LLF, some sufficient stability conditions are introduced. It is shown that the weighting function significantly reduces the conservatism of the stability criteria in comparison to estimation of the lower bound on LLF without this function. To solve the finite-time stabilization problem, a stabilizing linear state controller is designed by exploiting the cone complementarity linearization algorithm. Two numerical examples are given to illustrate the effectiveness of the proposed method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 479-487
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of pH and Aluminium to Bacteria Isolated from Aluminium Recycling Industry
Autorzy:
Kurniawan, S. B.
Purwanti, I. F.
Titah, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/124582.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aluminium recycling industry
Brochothrix thermosphacta
indigenous bacteria
pH
Pseudomonas aeruginosa
Vibrio alginolyticus
Opis:
Aluminium recycling is one of currently growing industries in Indonesia. Abundant amounts of aluminium waste leads to the emergence of new industries. The waste produced from this kind of industry is not well processed yet. Bioremediation using isolated indigenous bacteria is one of the best options from treating the aluminium recycling wastewater. Since biological processes are closely related to the bacterial growth conditions, it is important to understand the effect of pH and aluminium exposure to bacteria. Six potential bacteria strains were obtained from isolation. Vibrio alginolyticus and Brochothrix thermosphacta were shown to be resistant to the aluminium exposure, as well as the acidic conditions. Both types of bacteria were able to survive on acid medium with pH 5. The higher the concentration of aluminium, the slower bacterial growth rate achieved. The MIC value of aluminium for Vibrio alginolyticus was 425 mg/l, Brochothrix thermosphacta was 325 mg/l and Pseudomonas aeruginosa was 200 mg/l.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 154-161
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economics analysis of maize hybrid influenced by tillage method and planting density
Autorzy:
Thapa, S. B.
Shrestha, P.
Basnet, K. B.
Aryal, K.
Powiązania:
https://bibliotekanauki.pl/articles/1076709.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
B:C ratio
Economic analysis
Maize
Zea mays
planting density
tillage method
Opis:
The experiment was laid out in a strip-split plot design consisting of 16 treatments with three replications, at NMRP, Rampur, Chitwan during the winter season (October, 2015 to March, 2016). Four different levels of planting geometry (60 cm×30 cm, 60 cm×24 cm, 60 cm×19.5 cm and 60 cm×16.5 cm, representing 55,555, 69,444, 85,470 and 1,01,010 plants ha-1, respectively), two hybrid varieties of maize (Rampur hybrid 4 and Rampur hybrid 6) and two tillage methods (conventional and zero tillage) were used as the treatments. Economic analysis revealed that significantly higher net benefit (NRs. 1,06,692 ha-1) was obtained with 85 rather than 55 thousand plants ha-1 (NRs. 79,249 ha-1), but remained at par with 69 (NRs. 92,656 ha-1) and 101 (NRs. 96,198 ha-1) thousand plants ha-1. Moreover, the B:C ratio was higher in 85 (2.57) than 55 (2.28), 69 (2.43) and 101 (2.35) thousand plants ha-1. The net returns and B:C ratio (NRs. 97,372 and 2.46) obtained from Rampur hybrid 6 were also higher, but statistically at par with Rampur hybrid 4 (NRs. 90,024 and 2.35), respectively. In addition, net returns and B:C ratio obtained from zero tillage (NRs. 1,03,473 and 2.6) were better than conventional tillage (NRs. 83,924 and 2.22). Thus, both hybrid maize varieties (Rampur hybrid 4 and Rampur hybrid 6) can be successfully grown under a zero tillage system with optimum plant population of 85 thousand plants ha-1 to achieve higher grain yield and better winter season net returns in western Chitwan, Rampur, Nepal.
Źródło:
World News of Natural Sciences; 2019, 24; 71-78
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal creep stress and strain analysis in a non-homogeneous spherical shell
Autorzy:
Thakur, P.
Singh, S. B.
Pathania, D. S.
Verma, G.
Powiązania:
https://bibliotekanauki.pl/articles/949332.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stress
strain rates
thermal
spherical shell
non-homogeneous
Opis:
The purpose of this paper is to present study of thermal creep stress and strain rates in a non-homogeneous spherical shell by using Seth’s transition theory. Seth’s transition theory is applied to the problem of creep stresses and strain rates in the non-homogeneous spherical shell under steady-state temperature. Neither the yield criterion nor the associated flow rule is assumed here. With the introduction of thermal effect, values of circumferential stress decrease at the external surface as well as internal surface of the spherical shell. It means that the temperature dependent materials minimize the possibility of fracture at the internal surface of the spherical shell. The model proposed in this paper is used commonly as a design of chemical and oil plants, industrial gases and stream turbines, high speed structures involving aerodynamic heating.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1155-1165
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of laying down posture while using smartphone among school children in Nakhon Si Thammarat, Thailand
Autorzy:
Madardam, U.
Veerasakul, S.
Tamrin, S.B.M.
Mongkonkansai, J.
Powiązania:
https://bibliotekanauki.pl/articles/28765617.pdf
Data publikacji:
2022
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Lots of children use the smartphone in lying down posture that is unappreciated posture. The postures of children while using a smartphone affect their musculoskeletal pain and can enhance Musculoskeletal Disorders (MSDs). Objective. To study the effect of lying down posture while using smartphone among school children in Nakhon Si Thammarat, Thailand. Materials and methods. This survey study employed a Descriptive Cross-Sectional Design. The population was Grade 1-6 students studying in a primary school in Nakhon Si Thammarat. There were 122 samples selected based on the Volunteer Sampling Technique under the written consent of the students’ guardians. The research instruments employed in this study were: 1) Questionnaire adapted from Nordic Musculoskeletal Questionnaire asking musculoskeletal symptoms, 2) Posture Assessment using Kinovea Software to measure the angles of the muscle and postures during photo and video shooting of the smartphone users. The data were analyzed using descriptive statistics while Chi-square and Mann-Whitney U tests were used to test the mean differences. Results. There is a significant difference at p<0.05 level in mean angles of the neck, trunk, shoulder, and lower arms when using smartphones in supine and prone postures. The correlation between smartphone usage postures and musculoskeletal symptoms at the head/neck, trunk, and upper arm are found significantly different at p<0.05 level. The statistically significant difference at p<0.05 level is also found in the differences of age, length of smartphone ownership, position when using smartphone, and length of a smartphone usage in lying down positions. Conclusion. Smartphone usage in lying down positions of the participants can cause musculoskeletal pain especially in prone posture. It is recommended that guardians or relevant sectors have greater attention to smartphone usage among children to prevent their long-term musculoskeletal problems.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2022, 73, 2; 221-229
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and salt fluxes in the West Spitsbergen Current area in summer
Autorzy:
Piechura, J.
Osinski, R.
Petelski, T.
Wozniak, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/49050.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Spitsbergen Current
temperature
radiation flux
energy flux
heat flux
sea surface
salt flux
ocean circulation
Opis:
Fluxes of radiation, sensible and latent heat, and fluxes of heat and salt within the upper layer of the ocean were calculated on the basis of measurements carried out in the area of the Norwegian-Atlantic and West Spitsbergen Currents during summer 2000. The sea surface radiation balance was calculated from direct measurements of downward and upward short-wave (solar) radiation, the net radiation fluxes and sea surface temperature. The daily doses of radiation energy reaching and leaving the sea surface were also estimated. To calculate the vertical heat fluxes in the atmospheric boundary layer the bulk parameterisation method was used. In most cases, the calculated heat fluxes were rather low, the average sensible heat flux was c. 10 Wm−2, and the latent heat flux about one order of magnitude higher; this is what could be expected in summer. Salt fluxes to the air in the process of aerosol production are very small and can be neglected. In summer the highest quantities of heat and salt are exchanged during mixing with surrounding waters. According to our measurements, Atlantic Water on its northward course from about 70◦N to 79◦ N loses about 100 TWof heat and 900 × 103 kg of salt. We thought it could be interesting to find out what happens to them. Some preliminary results of our investigation are presented here.
Źródło:
Oceanologia; 2002, 44, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Light-Emitting Diodes Illumination Period and Light Intensity on High Rate Algal Reactor System in Laundry Wastewater Treatment
Autorzy:
Tangahu, B. V.
Triatmojo, A.
Purwanti, I. F.
Kurniawan, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/123276.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
algae
Chlorella vulgaris
laundry wastewater
illumination period
light-emitting diodes
light intensity
microalgae
Opis:
Wastewater that contains high concentration of nutrients can create instability in water ecosystem if left untreated. Laundry wastewater contains nutrients in high concentration. The nutrients that commonly found in laundry wastewater are nitrogen and phosphorus. This study had a purpose to determine the effect of illumination period and light intensity for the removal of Chemical Oxygen Demand (COD), Nitrogen-ammonia (NH3-N), and phosphate (P) content using Chlorella vulgaris in High Rate Algal Reactor (HRAR) treatment. Variables that used were exposure period of 12 and 24 hours and light intensity of 2000–3000 Lux, 4000–5000 Lux, and 6000–7000 lux. The parameters tested to determine the efficiency of nutrient removal were COD, Nitrogen-ammonia, phosphate and Chlorophyll α to determine the condition of algae development. The results showed that the highest nutrient removal were obtained by the reactor with 24 hours illumination period with light intensity of 6000–7000 Lux that was capable of removing 54.63% of COD, and 22.15% of P. The 12-hour illumination period was better in terms of NH3-N removal, up to 50.07%. On the basis of the of statistic test result, the illumination period did not significantly influence the removal efficiency of COD, NH3-N and P indicated by P-value >0.05, while the light intensity significantly affect the removal of COD and NH3-N showed by P value <0.05.
Źródło:
Journal of Ecological Engineering; 2018, 19, 6; 170-175
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awareness of and demand for private agricultural extension services among small-scale farmers in Nigeria
Świadomość dotycząca prywatnych usług w dziedzinie doradztwa rolniczego oraz popyt na nie wśród właścicieli małych gospodarstw rolnych w Nigerii
Autorzy:
Fakayode, S.B.
Adenuga, A.H.
Yusuf, T.
Jegede, O.
Powiązania:
https://bibliotekanauki.pl/articles/43049.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
awareness
demand
agricultural extension
service
small farmer
privatization
Nigeria
Opis:
This study investigated the awareness of and demand for private agricultural extension services among smallscale farmers in Nigeria, using farmers in Oyo state as a case study. Specifically, the study examined the availability and operations of private agricultural extension services and factors that determine farmers’ willingness to pay for such services. The results showed that a considerable number of farmers are willing to pay for private agricultural extension services. The number of plots cultivated by the farmers was found to influence farmers’ willingness to pay for private agricultural extension services at one percent level of significance. Income, awareness, family size and total number of plots were identified as the major factors influencing the use of private agricultural extension services in the study area. The study recommended the need for the government to mobilize farm households to avail themselves of benefits of private extension services. Efforts should also be stepped up by all development stake-holders to provide additional sources of income for farm households, in order to raise their income and demand capabilities.
W niniejszym artykule przedstawiono badanie poziomu świadomości dotyczącej prywatnych usług w dziedzinie doradztwa rolniczego oraz popytu na nie wśród właścicieli małych gospodarstw rolnych w Nigerii. Badaną grupę stanowili rolnicy zamieszkujący stan Oyo. Szczególnie skupiono się na dostępności i funkcjonowaniu prywatnych usług w dziedzinie doradztwa rolniczego oraz na czynnikach, które wpływają na skłonność rolników do zapłaty za tego typu usługi. Wykazano, że znaczna liczba rolników jest skłonna zapłacić za prywatne usługi z zakresu doradztwa rolniczego. Okazało się, że na skłonność rolników do zapłaty wpływała liczba uprawianych działek ziemi, przy istotności na poziomie 1%. Dochód, poziom świadomości, wielkość rodziny i całkowitą liczbę działek uznano za główne ograniczenia w korzystaniu z prywatnych usług w dziedzinie doradztwa rolniczego na badanym obszarze. W artykule wskazano na konieczność zachęcenia gospodarstw rolnych przez rząd do skorzystania z prywatnych usług w dziedzinie doradztwa rolniczego. Także udziałowcy powinni podjąć kroki w celu zapewnienia dodatkowych źródeł utrzymania gospodarstwom, by zwiększyć ich dochód oraz popyt na usługi.
Źródło:
Journal of Agribusiness and Rural Development; 2016, 42, 4
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sea slug’s guide to plastid symbiosis
Autorzy:
de Vries, J.
Rauch, C.
Christa, G.
Gould, S.B.
Powiązania:
https://bibliotekanauki.pl/articles/57091.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
sea slug
slug
plastid
symbiosis
kleptoplasty
photosynthesis
photosynthetic slug
evolution
Opis:
Some 140 years ago sea slugs that contained chlorophyll-pigmented granules similar to those of plants were described. While we now understand that these “green granules” are plastids the slugs sequester from siphonaceous algae upon which they feed, surprisingly little is really known about the molecular details that underlie this one of a kind animal-plastid symbiosis. Kleptoplasts are stored in the cytosol of epithelial cells that form the slug’s digestive tubules, and one would guess that the stolen organelles are acquired for their ability to fix carbon, but studies have never really been able to prove that. We also do not know how the organelles are distinguished from the remaining food particles the slugs incorporate with their meal and that include algal mitochondria and nuclei. We know that the ability to store kleptoplasts long-term has evolved only a few times independently among hundreds of sacoglossan species, but we have no idea on what basis. Here we take a closer look at the history of sacoglossan research and discuss recent developments. We argue that, in order to understand what makes this symbiosis work, we will need to focus on the animal’s physiology just as much as we need to commence a detailed analysis of the plastids’ photobiology. Understanding kleptoplasty in sacoglossan slugs requires an unbiased multidisciplinary approach.
Źródło:
Acta Societatis Botanicorum Poloniae; 2014, 83, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Next generation of physics-based system for port planning and efficient operation
Autorzy:
Mortensen, S. B.
Harkin, A.
Kofoed-Hansen, H.
Mlaś, W.
Powiązania:
https://bibliotekanauki.pl/articles/116540.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
port operations
efficient operation
port planning
under keel clearance (UKC)
full mission bridge simulator (FMBS)
force technology
traffic management system
port traffic flow
Opis:
The continuing surge in commercial vessel sizes is putting increasing pressures on the world’s port authorities to adopt effective expansion strategies to ensure that their asset is able to meet growing capacity demands. Among the key challenges is to assure that correct strategic planning and operational measures are adopted to guarantee safe and efficient traffic not only through its shipping channel, but also at the port berthing facilities. DHI and FORCE TECHNOLOGY have collaborated to develop a novel physics-based vessel traffic management system named NCOS ONLINE. It is capable of taking into account of any relevant vessel constraints such as under-keel clearance (UKC), maneuverability and berth configuration that may constrict the movement of vessels through the channel or operability at berth, facilitating scenario planning and capacity assessment of proven unparalleled accuracy. The system incorporates the accuracy of high-end Full Mission Bridge Simulators with regards to vessel response under power and at berth. The underlying computational engines uses a powerful 3D panel method for vessel response calculations in combination with highly detailed environmental data such as wind, waves and hydrodynamics (water level and currents) simulated by use of MIKE Powered by DHI’s recognized and scientific based computational models. The modular and integrated framework-based system has already been adopted by numerous port authorities, terminal operators and pilots worldwide for strategic port planning, design and 24/7 operational vessel traffic management. The paper focus on presenting the underlying equational framework and validation of the underlying physical response engines and provide a brief introduction to how they are integrated and operated through a series of user-friendly web dashboards.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 99-105
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspectives of renewable energy sources use in enhancement of environmental and energy security of Belarus
Perspektivy ispolzovanija vozobnovjaemykh istochnikov ehnergii v povyshenija ehkologicheskojj i ehnergeticheskojj bezopasnosti Belarusi
Autorzy:
Busko, E.G.
Pazniak, S.S.
Kostukevich, S.B.
Dudkina, L.A.
Powiązania:
https://bibliotekanauki.pl/articles/792946.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
renewable energy source
alternative energy
environmental requirement
energy production
Belorussia
electrical energy
water resource
solar energy
biogas
livestock waste
geothermal energy
household waste
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro flowering and micropropagation of Lisianthus (Eustoma grandiflorum) in response to plant growth regulators (NAA and BA)
Kwitnienie i mikropropagacja in vitro lisianthusa (Eustoma grandiflorum) w reakcji na regulatory wzrostu roslin (NAA i BA)
Autorzy:
Kaviani, B.
Zamiraee, F.
Zanjani, S.B.
Tarang, A.
Torkashvand, A.M.
Powiązania:
https://bibliotekanauki.pl/articles/11542950.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
in vitro culture
ornamental plant
flowering
micropropagation
Lisianthus
Eustoma grandiflorum
plant response
plant growth regulator
NAA potassium salt
axillary bud
callus
plant tissue culture
Opis:
In vitro flowering and micropropagation are useful for plant breeding programs and commercial production of important ornamental plants. In vitro conditions including media components, kind, concentration and ratio of plant growth regulators and culture conditions significantly affect in vitro flowering and micropropagation. There is no any report dealing with the in vitro flowering of Lisianthus (Eustoma grandiflorum). Here, a protocol was developed for flowering and high frequency in vitro micropropagation of E. grandiflorum, an ornamental plant. Micropropagation is an effective tools for propagation of ornamental plants in large scale. The aim of the present study was to evaluate the effect of different concentrations of NAA and BA on micropropagation and flowering of Lisianthus, in vitro. Used culture medium was MS enriched with 0, 0.1, 0.2 and 2 mg L-1 of NAA and BA. In establishment process of explants, the most shoot length (2.07 cm per plant) was obtained on medium supplemented with 0.1 mg L-1 BA (without NAA). Maximum shoot number (5.80 per plant) was produced in medium containing 0.1 mg L-1 BA along with 0.2 mg L-1 NAA. Bud explants in culture media containing 0.2 mg L-1 NAA (without BA) and 0.1 mg L-1 NAA along with 2 mg L-1 BA produced maximum node number (3.20 per plant). The largest number of root (14.53 per plant) and root length (3.87 cm per plant) were produced on 0.2 mg L-1 NAA without BA, also 0.2 mg L-1 BA plus 0.2 mg L-1 NAA and 0.2 mg L-1 BA without NAA. Explants produced flower on medium containing 0.1 mg L-1 BA along with 0.1 mg L-1 NAA without transition of callus formation. Flower was produced from callus in medium containing 0.1 mg L-1 BA along with 2 mg L-1 NAA. Regenerated plants showed 98% survival in greenhouse during acclimatization. Acclimatized plants were morphologically similar to the mother plants.
Kwitnienie i mikropropagacja in vitro są użyteczne w programach hodowli roślin oraz produkcji komercyjnej ważnych roślin ozdobnych. Warunki in vitro, łącznie ze składnikami pożywek, rodzajem, stężeniem oraz proporcją regulatorów wzrostu roślin, a także warunkami hodowli, w sposób istotny wpływają na kwitnienie i mikropropagację in vitro. Nie istnieje żadne badanie dotyczące kwitnienia in vitro lisanthiusa (Eustoma grandiflorum). W niniejszym badaniu opracowano kwitnienie i wysoką częstotliwość mikropropagacji in vitro dla E. grandiflorum, który jest rośliną ozdobną. Mikropropagacja jest skutecznym narzędziem rozmnażania roślin ozdobnych na dużą skalę. Celem niniejszego badania była ocena wpływu różnych stężeĔ NAA i BA na mikropropagację i kwitnienie lisianthiusa in vitro. Używana pożywka hodowlana została wzbogacona za pomocą 0; 0,1; 0,2 i 2 mg L-1 NAA i BA. Przy powstawaniu eksplantów największa długość łodygi (2,07 cm na roślinę) była uzyskana na pożywce uzupełnionej o 0,1 mg L-1 BA (bez NAA). Maksymalna liczba łodyg (5,80 na roślinę) została wytworzona na pożywce zawierającej 0,1 mg L-1 BA wraz z 0,2 mg L-1 NAA. Eksplanty pączków na pożywce hodowlanej zawierającej 0,2 mg L-1 NAA (bez BA) oraz 0,1 mg L-1 NAA wraz z 2 mg L-1 BA wytworzyły maksymalną liczbę węzłów (3,20 na roślinę). Największą liczbę korzeni (14,53 na roślinę) oraz największą długość korzenia (3,87 na roślinę) zaobserwowano na 0,2 mg L-1 NAA bez BA jak również 0,2 mg L-1 BA plus 0,2 mg L-1 NAA oraz 0,2 mg L-1 BA bez NAA. Eksplanty tworzyły kwiat na pożywce zawierającej 0,1 mg L-1 BA wraz z 0,1 mg L-1 NAA bez przeniesienia kalusa. Kwiat był tworzony z kalusa na pożywce zawierającej 0,1 mg L-1 BA wraz z 2 mg L-1 NAA. Zregenerowane rośliny wykazały 98% przeżycie w szklarni podczas aklimatyzacji. Zaaklimatyzowane rośliny były morfologicznie podobne to swych roślin macierzystych.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 4; 145-155
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dynamics of the Forest Graph Operator
Autorzy:
Dara, Suresh
Hegde, S.M.
Deva, Venkateshwarlu
Rao, S.B.
Zaslavsky, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/31340605.pdf
Data publikacji:
2016-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
forest graph operator
graph dynamics
Opis:
In 1966, Cummins introduced the “tree graph”: the tree graph \( \textbf{T} (G) \) of a graph \( G \) (possibly infinite) has all its spanning trees as vertices, and distinct such trees correspond to adjacent vertices if they differ in just one edge, i.e., two spanning trees \( T_1 \) and \( T_2 \) are adjacent if \( T_2 = T_1 − e + f \) for some edges \( e \in T_1 \) and \( f \notin T_1 \). The tree graph of a connected graph need not be connected. To obviate this difficulty we define the “forest graph”: let \( G \) be a labeled graph of order \( \alpha \), finite or infinite, and let \( \mathfrak{N}(G) \) be the set of all labeled maximal forests of \( G \). The forest graph of \( G \), denoted by \( \textbf{F} (G) \), is the graph with vertex set \( \mathfrak{N}(G) \) in which two maximal forests \( F_1 \), \( F_2 \) of \( G \) form an edge if and only if they differ exactly by one edge, i.e., \( F_2 = F_1 − e + f \) for some edges \( e \in F_1 \) and \( f \notin F_1 \). Using the theory of cardinal numbers, Zorn’s lemma, transfinite induction, the axiom of choice and the well-ordering principle, we determine the F-convergence, F-divergence, F-depth and F-stability of any graph \( G \). In particular it is shown that a graph \( G \) (finite or infinite) is F-convergent if and only if \( G \) has at most one cycle of length 3. The F-stable graphs are precisely \( K_3 \) and \( K_1 \). The F-depth of any graph \( G \) different from \( K_3 \) and \( K_1 \) is finite. We also determine various parameters of \( \mathbf{F} (G) \) for an infinite graph \( G \), including the number, order, size, and degree of its components.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 4; 899-913
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przemysłowe oczyszczanie paliw ciekłych metodą filtracji przez porowate materiały polimerowe
Industrial cleaning of fuel by means of porous polymeric materials
Autorzy:
Klimov, A. V.
Panov, S. B.
Serdiuk, L. A.
Ashkinazi, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/1826095.pdf
Data publikacji:
2007
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
jakość paliw silnikowych
oczyszczanie
paliwa ciekłe
Opis:
W swojej poprzedniej publikacji autorzy skupili się na problemie regeneracji olejów hydraulicznych metodą udoskonalonej filtracji [1]. Nie mniej ważnym zagadnieniem jest utrzymanie jakości paliw silnikowych na całej drodze dystrybucji od producenta do użytkownika. Główną przyczyną niskiej jakości paliwa jest naruszenie technologii produkcji, transportu i przechowywania paliwa, a nawet tankowania środków transportu i maszyn budowlanych. W Związku Radzieckim przypadki nieprzestrzegania wymagań stawianych jakości paliwa były nonsensem, ponieważ jego produkcja i realizacja znajdowała się pod państwową kontrolą. Wraz z przejściem do gospodarki wolnorynkowej możliwość produkcji i przechowywania paliw silnikowych uzyskały wszystkie chętne osoby fizyczne i podmioty gospodarcze [2]. Uciążliwym problemem jest zanieczyszczenie paliw przez związki smoliste, wodę, domieszki stałe i biozanieczyszczenia w procesie przechowywania, transportu i dystrybucji do hurtowni i stacji paliwowych [2]. Zanieczyszczenia działają w sposób skojarzony i nawzajem się nasilają, pogarszając jakość paliw w drodze do odbiorcy. Na przykład, występowanie wody sprzyja utlenianiu substancji ropopochodnych i rozwojowi w nich biozanieczyszczeń na granicy faz paliwo-woda. Obecność wilgoci zmniejsza wartość opałową paliwa i inicjuje korozję układu paliwowego, natomiast w obecności domieszek stałych obserwuje się zwiększone mechaniczne zużycie pomp paliwowych i wtryskiwaczy, zakleszczanie nurników i zatykanie dysz [3]. W niektórych układach paliwowych wilgoć powoduje zniszczenie filtru doczyszczania paliwa. Zanieczyszczenia stałe, zawierające w większości przyapadków metale w postaci produktów korozji, są katalizatorami utleniania, w trakcie którego powstają kwasy i różne związki smoliste i asfalteny. Z kolei kwasy powodują korozję zbiorników przewodów i armatury podczas przechowywania i przepompowania paliw, zwiększając w ten sposób ilość zanieczyszczeń stałych, a także sprzyjając tworzeniu warunków do polimeryzacji związków smolistych i powstawania statecznych układów koloidalnych. W wyniku działalności zanieczyszczeń biologicznych (grzybów i bakterii) zachodzi nie tylko gromadzenie szkodliwej biomasy, powodującej zakłócenia w pracy układu paliwowego, ale także utlenianie paliw z powstawaniem kwasów organicznych. Utrzymanie wysokiej jakości paliwa wymaga kompleksu środków przewidujących usunięcie wszystkich lub większości z wymienionych zanieczyszczeń. Tradycyjnie na szeroką skalę stosuje się tylko filtrację mechaniczną. Zastosowanie separatorów odśrodkowych w celu usunięcia wody i zanieczyszczeń stałych ograniczone jest z powodu złożoności i wysokich kosztów sprzętu, jak również jego skomplikowanej i pracochłonnej konserwacji i eksploatacji. Filtry koalescencyjne tracą sprawność w obecności znacznej ilości zanieczyszczeń mechanicznych. Natomiast odstojniki stosowane mogą być tylko jako środek do wstępnego oczyszczania paliwa.
Longevity and reliability of work of engines in many respects are determined by the quality of used fuels. The presence of water, mechanical impurities, acids and biological pollution in oil leads to increased mechanical and corrosion wear as well as to failures of the engines. Using bad fuels is a serious environmental problem. This is caused both by possible environmental pollution and by huge quantity of used fuels. The problem of the complex cleaning of fuels can be solved most effectively by the use of porous polymeric compositions as the filtering material. Disadvantages of this material are non-uniformity of porous structure, and also infringement of form and size of a filtering element after regeneration with the subsequent drying. The new type of a filtering material has no such disadvantages. It is received by washing technology from reactionary mass away of water-soluble structural additives. This material is characterized by the uniform porous structure, possibility of obtaining the filtering elements of any form and sizes. It is obtained by the possibility to operate such characteristics as water absorption, size of pores, general porosity, strength, elasticity, etc. The material "APRISORB", created using this technology, not only effectively absorbs water and mechanical impurities but also continuously cleans itself from the accumulated water (Fig. 1, 2). Collecting efficiency was determined for dust quartz characterized with the specific surface area of 10500 sm2/g (Fig. 3). Depending on the type of the filtering element a pressure difference with the nominal charge was varied from 10.6 to 17.6 kPa, and the collecting efficiency from 77.0 to 99.8%. Researches showed that on the water-oil border were formed the steady colloidal structures. These systems contain a plenty of microorganisms and products of their vital activity. There were isolated cultures of microorganisms, including cultures of the simplest fungi and cultures of bacteria (Fig. 4). Among them are Pseudomonas aeruginosa, Cladosporium reinae and Candida. Specifically, these microorganisms participate in worsening of the quality of fuels. The filtration of oils polluted by microorganisms through the filter made of APRISORB, ensures effective clearing at a level of 99.4÷99.9%. The test results of new filters convincingly prove the perspectives of their use for cleaning of any fuels: from the stage of fuel manufacturing up to operation of cars and ships engines (Fig. 5-10).
Źródło:
Rocznik Ochrona Środowiska; 2007, Tom 9; 55-66
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New simple statistical formulas for estimating surface concentrations of suspended particulate matter (SPM) and particulate organic carbon (POC) from remote-sensing reflectance in the Southern Baltic Sea
Autorzy:
Wozniak, S.B.
Darecki, M.
Zablocka, M.
Burska, D.
Dera, J.
Powiązania:
https://bibliotekanauki.pl/articles/47748.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Źródło:
Oceanologia; 2016, 58, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern tillage and integrated nutrient management practices for improving soil fertility and productivity of groundnut (Arachis hypogaea L.) under rainfed farming system
Autorzy:
Patil, S.B.
B.C., Balakrishna Reddy
Chitgupekar, S.C.
Patil, B.B.
Powiązania:
https://bibliotekanauki.pl/articles/11868.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The field experiment was conducted with four tillage and three nutrient management practices at Agronomy field unit, University of Agricultural Sciences, GKVK, Bangalore, Karnataka, India. The results of the study indicated that, higher groundnut pod yield (1307 and 1282 kg ha-1) and haulm yield (2733 and 2889 kg ha-1) was recorded with mechanical tillage + two intercultivations and integrated application of 50% organics and 50% inorganics, respectively as compared to rest of the treatments. Further, the same treatments noticed higher availability of N, P2O5 and K2O in soil after harvest of groundnut, but greater improvement in soil organic carbon content was observed with conventional tillage + one intercultivation (0.62%) as compared to rest of the tillage practices. The maximum net returns and benefit-cost ratio was recorded with mechanical tillage + two intercultivations (Rs. 11,287 ha-1 and 1.75, respectively) and integrated application of 50% organics + 50% inorganics (Rs. 10,462 ha-1 and 1.69, respectively). However, interaction effect of tillage and nutrient management practices were not influenced significantly on soil fertility and productivity of groundnut under rainfed farming system.
Źródło:
International Letters of Natural Sciences; 2015, 02
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspectives of the use of renewable energy sources in enhancement of environmental and energy security of belarus
Autorzy:
Busko, E. G.
Pazniak, S. S.
Kostukevich, S. B.
Dutkina, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/410859.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
źródła energii odnawialnej
alternatywne źródła energii
Białoruś
renewable energy sources
alternative energy sources
Belarus
Opis:
Interest in renewable energy sources (RESs) has been growing all over the world in recent years. The market for alternative energy resources is quickly growing in Western Europe and in Asia. The development of renew able energy is caused by two major factors, one of which is an environmental requirement. Its importance increases from the legislative point of view and from the conditions accepted by the Convention on Climate in December 1997. The second requirement concerns energy production capacity. According to this requirement the preference is given to production forms which can be created and developed quickly. The development of RES in many cases is closely connected with the maintenance of energy safety of the country, influencing its sovereignty and independence.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 2; 9-16
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasites community of Astronotus crassipinnis (Cichlidae), a fish from the Brazilian Amazon
Autorzy:
Santos, G.G.
Oliveira, M.S.B.
Neves, L.R.
Tavares-Dias, M.
Powiązania:
https://bibliotekanauki.pl/articles/972319.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
aggregation
parasites
Amazon
Astronotus crassipinnis
Cichlidae
Opis:
We provide the first study on the diversity and community of parasites in Astronotus crassipinnis from the lower Amazon River, in Brazil. Of 35 hosts examined, 100% were infected with one or more species of parasites, such as Gussevia asota, Gussevia astronoti, Gussevia rogersi, Posthodiplostomum sp., Contracaecum sp., Gorytocephalus sp. and Dolops longicauda. Gussevia asota, G. astronoti and G. rogersi were dominant, and, in total, 9788 parasites were collected. The richness of parasite species (4.9±0.7), Brillouin diversity (0.46±0.28) and evenness (0.29±0.17) were low. Parasites had aggregated dispersion, parasitism did not affect the host condition factor, and host size did not influence abundance, species richness and parasite diversity. The parasitic fauna was characterized by the presence of few species of parasites with high prevalence and low abundance, specifically the endoparasites, besides dominance of ectoparasites. The presence of endoparasites indicates that the diet of A. crassipinnis consists mostly of mollusks and microcrustaceans. This fish species is an intermediate host for Posthodiplostomum sp., Contracaecum sp. and Gorytocephalus sp., parasites found in larval stage. Finally, the behavior and availability of infective stages, which are intermediate hosts for endoparasites, were factors structuring the communities of endoparasites.
Źródło:
Annals of Parasitology; 2018, 64, 2; 121-128
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Petrographic and geochemical study of the Maastrichtian Ajali Sandstone, North Central Nigeria
Autorzy:
Ogala, J. E.
Olobaniyi, S. B.
Omo-Irabor, O. O.
Adaikpoh, E. O.
Powiązania:
https://bibliotekanauki.pl/articles/2059843.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrography
geochemistry
Ajali Sandstone
provenance
tectonic setting
Opis:
he Upper Cretaceous Ajali Sandstone is an extensive stratigraphic unit of the Anambra Basin in southern Nigeria. It consists of friable, white cross-bedded sandstones exhibiting a fining upward sequence. Structures such as bioturbation, planar and herringbone cross beds indicate variability in depositional environment ranging from fluviatile to deltaic. Petrographic and geochemical compositions (major and trace elements) of these sandstones have been investigated to determine their provenance, tectonic setting and weathering conditions. Fifteen sandstone samples examined are rich in quartz but poor in feldspar and lithic fragments. Texturally, the framework grains of the sandstones are fine- to medium-grained, sub-angular to sub-rounded, moderately sorted to poorly sorted, positively skewed and leptokurtic. The sandstones are texturally immature as depicted by their sub-angular edges of grains, but mineralogically mature in terms of high percentage of quartz. The high chemical index of alteration (CIA) values (71.0–99.2%) for these sandstones suggests that they were derived from highly weathered rocks in the source area. The composition of the major oxides in the sandstones revealed that SiO2 (49.1–99.7%), Al2O3 (0.2–30.3%), Fe2O3 (0.4–1.8%) and TiO2 (0.06–3.2%) were the most abundant elements in all sandstone samples indicating a high detrital quartz and clay mineral content. The Al2O3/TiO2 ratios (1.47 to 12.48), Ti/Zr (6.48–18.63) and Zr/Cr (2.24–22.36) suggest that the sandstones were derived from variable basement complex rocks, including some contribution from mafic or ultramafic components. Inferences from the plots of K2O/Na2O versus SiO2 indicated a passive margin tectonic setting for the sandstones. The high loading of CaO and Na2O in more than 50% of the samples is indicative of terrigenous input, mainly in the form of carbonates and silicates. These results are generally consistent with a derivation of the sandstones from adjacent igneous and metamorphic basement complexes (Cameroon–Adamawa highlands and Oban Massif) while the extensive and blanket-like geometry of the Ajali Sandstone is indicative of an excellent reservoir for groundwater in the Anambra Basin.
Źródło:
Geological Quarterly; 2015, 59, 1; 79--90
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monogenoidea parasites of Cichla monoculus and Cichla pinima (Osteichthyes: Cichlidae), sympatric fish in lower Tapajós River, Northern Brazil
Autorzy:
Oliveira, M.S.B.
Adriano, E.A.
Tavares-Dias, M.
Correa, L.L.
Powiązania:
https://bibliotekanauki.pl/articles/6677.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 2019, 65, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unveiling the Factors of Green Human Resources in Manufacturing Industries
Autorzy:
Sathyamoorthi, V.
Inayath-Ahamed, S. B.
Hariharasudan, A.
Szczepańska-Woszczyna, Katarzyna
Kot, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/24200524.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
green human resources
green creativity
proactive environmental management
environmental performance
environmental practices
Opis:
The severe consequences of climate change have left many unanswered questions about the environmental performance of businesses. Appropriate measures must be taken to tackle the problems conquered due to climate change. This study supports exploring the factors needed to get the Employees Environmental Performance (EEP). It includes Green Human Resources (GHR), Green Creativity (GC) and Proactive Environmental Management (PEM). The relationship among the variables was explored in the existing literature. This study aims to test the relationship between GHR and GC. Further, it also examined the mediating role of GC and moderating role of PEM. For this purpose, data were collected from employees of manufacturing companies (automobiles, food processing, chemicals, textiles, machinery and equipment) in India. More specifically, ISO 14001-certified companies were selected. Among the different institutions, 35 are manufacturing in India. Out of 35, 24 companies agreed to conduct a survey in their company. Totally 5376 employees were considered as a population for the study. With 95% confidence interval, 400 samples were selected, and a questionnaire was distributed among them using simple random sampling. 305 (76.25%) cases finalized for further analysis. The collected data analyzed using PLS-SEM with R software. The results highlighted the essential role of GHR practices in the manufacturing industry to enhance EEP since GHR positively influences EEP. Moreover, it was found that GC partially mediates the relationship between GHR and EEP. It indicates the importance of GC’s existence in increasing EEP through GHR. Finally, it was also found that PEM moderates the relationship between GHR and EEP. It suggested the role of pro-environmental management and their active pace in improving EEP. Managerial implications and future scope were discussed in this study.
Źródło:
Management and Production Engineering Review; 2023, 14, 3; 57--74
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inherent optical properties of suspended particulate matter in the Southern Baltic Sea
Autorzy:
Wozniak, S.B.
Meller, J.
Lednicka, B.
Zdun, A.
Ston-Egiert, J.
Powiązania:
https://bibliotekanauki.pl/articles/48001.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
chlorophyll a
coastal water
Gdansk Gulf
inherent optical property
light absorption
optical property
particulate organic carbon
particulate organic matter
phytoplankton
scattering
surface water
suspended particulate matter
Opis:
The inherent optical properties (IOPs) of suspended particulate matter and their relations with the main biogeochemical characteristics of particles have been examined in the surface waters of the southern Baltic Sea. The empirical data were gathered at over 300 stations in open Baltic Sea waters as well as in the coastal waters of the Gulf of Gdańsk. The measurements included IOPs such as the absorption coefficient of particles, absorption coefficient of phytoplankton, scattering and backscattering coefficients of particles, as well as biogeochemical characteristics of suspended matter such as concentrations of suspended particulate matter (SPM), particulate organic matter (POM), particulate organic carbon (POC) and chlorophyll a (Chl a). Our data documented the very extensive variability in the study area of particle concentration measures and IOPs (up to two orders of magnitude). Although most of the particle populations encoun- tered were composed primarily of organic matter (av. POM/SPM=ca 0.8), the different particle concentration ratios suggest that the particle composition varied significantly. The relations between the optical properties and biogeochemical parameters of suspended matter were examined. We found significant variability in the constituent-specific IOPs (coefficients of variation (CVs) of at least 30% to 40%, usually more than 50%). Simple best-fit relations between any given IOP versus any constituent concentration parameter also highlighted the significant statistical errors involved. As a result, we conclude that for southern Baltic samples an easy yet precise quantification of particle IOPs in terms of the concentration of only one of the following parameters – SPM, POM, POC or Chl a – is not achievable. Nevertheless, we present a set of best statistical formulas for a rough estimate of certain seawater constituent concentrations based on relatively easily measurable values of seawater IOPs. These equations can be implemented in practice, but their application will inevitably entail effective statistical errors of estimation of the order of 50% or more.
Źródło:
Oceanologia; 2011, 53, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating parameters of the Weibull diameter distribution for Gmelina arborea in Nimbia Forest Reserve, Nigeria
Autorzy:
Shamaki, S. B.
Akindele, S. O.
Marshall, P. L.
LeMay, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/1075794.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Gmelina arborea
Nimbia Forest Reserve
Weibull distribution
Opis:
Parameters of the Weibull diameter distribution were estimated for Gmelina (Gmelina arborea) plantation in Nimbia Forest Reserve. Stratified random sampling was employed to select five plots of 20 × 20 m from each forest bit that serves as management unit, thereby having a total of 20 plots for the study. Stump diameter (Dst), diameter at breast height (Dbh), diameter at middle and top positions (Dm and Dt) of trees, and tree height for all the selected trees were measured. Average Dbh measured was 16.33 cm and the mean tree height 6.85 m. Pseudo coefficient of determination (Pseudo R2), residual mean square error, Anderson-Darling, and Kolmogorov-Smirnov goodness-of-fit statistics were considered as model selection criteria. Weibull cumulative density function (Weibull-CDF) was the best fit method for Gmelina compared with the Weibull probability density function based on the goodness-of-fit statistics generated. The diameter distribution models produced are considered only efficient for tree stands of seven years rotation age, while additional site factors like spacing, density and silvicultural treatments are required for better models, hence the need for establishing permanent sample plots (PSP) in order to get additional information from re-measurements of the plots.
Źródło:
World Scientific News; 2019, 118; 209-219
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regeneracja olejów hydraulicznych metodą filtracji przez specjalistyczne materiały polimerowe
Improvement in the quality of hydraulic oils by the filtration through the special polymeric materials
Autorzy:
Klimov, A. V.
Panov, S. B.
Serdiuk, V. V.
Ashkinazi, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/1826137.pdf
Data publikacji:
2006
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
olej hydrauliczny
regeneracja
filtracja
Opis:
Trwałość i niezawodność pracy systemów hydraulicznych, jak również mechanizmów, w których one działają, w znacznej mierze zależy od jakości stosowanego oleju hydraulicznego. Występowanie w oleju wody, domieszek mechanicznych, kwasów, zanieczyszczeń biologicznych itp. powoduje przyśpieszone zużycie mechaniczne, korozję mechanizmów, zakłócenia w funkcjonowaniu systemu hydraulicznego. Powstający na skutek tego zły stan wyposażenia stwarza problemy zarówno organizacyjne, jak i finansowe, wynikające nie tylko z konieczności naprawy sprzętu, ale również ze straty czasu na usunięcie awarii, w którym nie uzyskuje się produkcji. Z drugiej strony, utylizacja i unieszkodliwianie zużytych olejów hydraulicznych stanowi poważny problem ekologiczny, z uwagi na oddziaływanie na środowisko naturalne, jak i ogromne ilości tych płynów stosowanych w różnych dziedzinach współczesnej techniki. Nawet oleje uznane za ulegające biodegradacji nierzadko stanowią poważny problem dla oczyszczalni ścieków. Dlatego regeneracja olejów hydraulicznych jest obecnie ważnym kierunkiem badań naukowych, również w spokrewnionych dziedzinach: technice maszyn hydraulicznych i ekologii stosowanej.
Longevity and reliability of the work of hydraulic mechanisms in many aspects are determined by the quality of the used hydraulic oil. The presence of water, mechanical impurities, acids and biological pollution in oil leads to the increased mechanical and corrosion wear, to the failures of the hydraulic system. At the same time recycling and neutralization of the used hydraulic oil is a serious environmental problem. This is caused both by possible environmental pollution, and with huge quantity of these liq-uids used in technology. The problem of the complex cleaning of oils can be solved most effectively by the use of porous polymeric compositions as the filtering material. Disadvantages of this material are non-uniformity of porous structure, and also infringement of the form and the sizes of a filtering element after regeneration with the subsequent drying. The new kind of a filtering material has none of those disadvantages. It is ob-tained in technology of washing away water-soluble structural additives from reactionary mass. This material is characterized by stable porous structure, possibility of obtaining the filtering elements of any forms and sizes. It gives the possibility to operate such characteristics as water absorption, size of pores, general porosity, strength, elasticity, etc. The material "APRISORB", created in this technology, not only effectively ab-sorbs water and mechanical impurities, but also continuously cleans itself from the accumulated water (Fig. 1). For determining the completeness of sifting quartz dust with the specific surface area of 5600 g/sm2 was used. Depending on the type of the filtering element a pressure differential with the nominal charge varied from 10,6 to 17,6 kPa, and the completeness of sifting from 81 to 90%. Research showed that on the border water-oil the steady colloidal structures are formed. These systems contain plenty of microorganisms and products of their activity. There were isolated 17 cultures of microorganisms, including 12 cultures of the simplest fungi and 5 cultures of bacteria. Among them are Gladosporium Resinae, Aspergillus Versicolar, Pseudomonas Aeruginosa and Bacillus Subtilis. Specifically, these microorganisms participate in worsening of the quality of oils. The filtration of oils polluted by microorganisms through the filter bed made of APRISORB material ensures effective cleaning at level of 99,4÷99,9%. Filters were used also for cleaning Univis N32 hydraulic oil used in the loading technology of the St. Petersburg trade port. Per cycle of cleaning the water content in oil was reduced from 150 to 20 ppm, and the oil class of cleanliness changed from 15 to 10 (ISO 4406). Tendency toward the formation of steadfast emulsions is one of the special features of the hydraulic oils, which contain the thickening additives. The filtering material APRISORB actively destroys such emulsions. Fig. 2 presents the photographs of water-contained oil used in the hydraulic press before and after cleaning. These photographs show that the filtration completely destroys emulsion and restores oil. The results of the tests of new filters convincingly prove the perspectives of their use for cleaning of hydraulic oils in the technological hydraulic systems.
Źródło:
Rocznik Ochrona Środowiska; 2006, Tom 8; 183-189
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does hormone replacement therapy benefit post-menopausal women? – a scoping review
Autorzy:
Mugada, V.
Kolakota, R.K.
Jadda, S.B.
Kotapadu, U.
Vessam, M.
Powiązania:
https://bibliotekanauki.pl/articles/1654.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Opis:
Post-menopausal women experience symptoms such as irregular periods, lower fertility, vaginal dryness, hot flashes and night sweats. Hormone replacement therapy (HRT) relieves menopausal symptoms. The aim of this review was to assess the benefits and risks of HRT in post-menopausal women. A scoping review was conducted for original peer-reviewed English language papers using the electronic databases of PUB MED, JAMA, BMC and TRIP. The papers were subjected to a three-stage screening process. The type of study, year of study, age, participants, type of therapy and the aim of the study defined the inclusion and exclusion criteria. HRT was associated with reduced risk and prevalence of end-stage kidney disease, gastric esophageal reflex disease (GORD) symptoms, periodontal disease and associated with the increased risk of overall cancers. The benefits of HRT depend on the duration of therapy, formulation, route of administration, time of initiating therapy (age <60 years) and type of therapy. Post-menopausal symptomatic women mostly benefited with hormone replacement therapy. To reduce risks of adverse events, HRT should be initiated with appropriate monitoring.
Źródło:
Medical Science Pulse; 2019, 13, 2
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biochemical, mineral and anatomical characteristics of the olive tree cv. Chetoui growing in several Tunisian areas
Autorzy:
Mansour-Gueddes, S.B.
Saidana, D.
Cheraief, I.
Dkhilali, M.
Braham, M.
Powiązania:
https://bibliotekanauki.pl/articles/12188720.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Tunisia
plant growing
Olea europaea
olive tree
Chetoui cultivar
plant cultivar
anatomical characteristics
biochemical characteristics
mineral content
volatile compound
growing condition
stress condition
Opis:
To tolerate harsh climatic conditions, olive tree Chetoui has developed some anatomic, physiologic and biochemical mechanisms. The aim of this study was to determine the indicators of stress in leaves, stems and roots growing under various climatic conditions. To protect against stress conditions this cultivar increased cuticle thickness, protective structures and building parenchyma tissues of leaves, woods and roots from the North to the South. The volatile compounds, extracted from northern and southern Chetoui leaves and roots, were analyzed by GC-FID and GC-MS. Great changes in volatiles were illustrated in the studied organs, by enrichment in phenolics and fatty acids for leaves and in hydrocarbons for roots of southern Chetoui. Also, a reduction in terpenes, alcohols and carbonylic compounds was noted in both southern samples. Moreover, minerals of all organs of Chetoui, varied in content and allocation, but their levels are the highest in leaves. The changes in volatiles might be affected by changes in the mineral elements uptake or accumulation under environment stress. A significant correlation was noted between phenolic compounds and sodium, nitrogen, and calcium contents. However, terpenoids was highly correlated with phosphorus content for all organs and studied areas. The detection of new volatiles, anatomical and mineral changes seem to be efficient indicators of adaptation of Chetoui to environment stress conditions.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 2; 49-70
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fingerprinting of on-farm conserved local tunisian orange cultivars (Citrus sinensis (L.) Osbeck) using microsatellite markers
Autorzy:
Abdelaali, S.B.
Debbabi, O.S.
Abdelaali, N.B.
Hajlaoui, M.R.
Mars, M.
Powiązania:
https://bibliotekanauki.pl/articles/19767.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2018, 60, 1
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Status report of the VINCY Cyclotron
Autorzy:
Nešković, N.
Ristić-Ðurović, J.
Vorojtsov, S. B.
Belicev, P.
Ivanenko, I. A.
Ćirković, S.
Vorozhtsov, A. S.
Bojović, B.
Dobrosavljević, A.
Vujović, V.
Comor, J. j.
Pajović, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/146191.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
accelerators
cyclotrons
ion sources
radioisotopes
radiation research
Opis:
The VINCY Cyclotron is the main part of the TESLA Accelerator Installation. The diameter of the pole of this machine is 2000 mm. Its bending constant is 145 MeV while its focusing constant is 75 MeV. The radiofrequency system of the machine consists of two l/4-resonators with the eigenfrequency in the range from 17 to 31 MHz. Ions coming from a heavy ion source or a light ion source will be injected into the machine axially. They will be introduced into its median plane by a spiral inflector. Heavy ions accelerated in the machine will be extracted from it by a foil stripping system or by an electrostatic deflection system. Light ions will be extracted from it by the foil stripping system. The first programs of use of the VINCY Cyclotron are related to routine and experimental production of radioisotopes and radiopharmaceuticals, and to biomedical research with ion beams. The first beam extracted from the machine will be the proton beam of the energy of 22 MeV obtained from the H2+ beam extracted from the light ion source. This beam will be used first for production of radioisotope 18F and radio-pharmaceutical 18FDG, to be employed for positron emission tomography
Źródło:
Nukleonika; 2003, 48,suppl.2; 135-139
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic characterization of Tunisian lime genotypes using pomological traits
Autorzy:
Saddoud Debbabi, O.
Abdelaali, S.B.
Bouhlal, R.
Zneidi, S.
Abdelaali, N.B.
Mars, M.
Powiązania:
https://bibliotekanauki.pl/articles/1080179.pdf
Data publikacji:
2020
Wydawca:
Instytut Ogrodnictwa
Tematy:
genetic characteristics
diversity
genetic resource
lime
Tunisia
pomology
Opis:
Citrus genus includes a wide number of species that have been long cultivated and well adapted in Tunisia. It is represented by small number of plantations and considered as underutilized in Tunisia. Our goal was to genetically characterize Tunisian lime genotypes to obtain data useful for gene conservation and breeding purposes. The survey of genotypes was conducted in the Cap Bon region, where citrus cultivation is the most spread. Sixteen quantitative and 19 qualitative parameters were evaluated. The observed accessions belonged to three different species: Citrus limetta, Citrus latifolia (limes Byrsa), and Citrus limettioides (limes of Palestine) according to Tanaka classification. Principal component analysis confirmed these classifications. Four-cell analysis (FCA) was used to determine the most threatened genotypes. Quantitative traits were evaluated and allowed the discrimination between genotypes. Many quantitative traits of fruit and juice were highly positively and significantly correlated. Phenotypic diversity was determined using Shannon–Wiener diversity index (H’). The highest value of diversity index was observed for both vesicle thickness and thickness of segment walls (H’ = 0.98). Intermediate values were observed for both fruit axis (H’= 0.49) and pulp firmness (H’ = 0.43). However, fruit shape (H’ = 0.24), shape of fruit apex (H’ = 0.24), and vesicle length (H’ = 0.33) presented the lowest values of diversity index. Current findings will be useful to conserve threatened genotypes ex situ and on farm and also will guide strategic conservation on Citrus genetic resources for future breeding programs.
Źródło:
Journal of Horticultural Research; 2020, 28, 1; 65-76
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the light absorption properties of particulate matter forming organic particles suspended in sea water. Part 3. Practical applications
Autorzy:
Wozniak, B.
Wozniak, S.B.
Tyszka, K.
Ostrowska, M.
Ficek, D.
Majchrowski, R.
Dera, J.
Powiązania:
https://bibliotekanauki.pl/articles/47909.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
marine environment
absorption coefficient
light index
sea water
particulate organic matter
modelling
light absorption
Źródło:
Oceanologia; 2006, 48, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantification of Sclerocarya birrea (Marula) fruits as feed supplement for ruminants in dry sub-humid zone of Nigeria
Autorzy:
Muhammad, N.
Omogbai, I. J.
Maigandi, S. A.
Abubakar, I. A.
Shamaki, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/1192686.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Marula fruits
Nigeria
Quantification
ruminant dry sub-humid
supplement
Opis:
A study was conducted in four selected local government areas of Sokoto state in the extreme North-western part of Nigeria to quantify Sclerocarya birrea fruits as feed supplement for ruminant animals. The areas were Kware, Wamakko, Bodinga and Rabah. A check list was used to obtain information from ten respondents from five districts in each local government area making a total of 200 respondents. Information collected includes tree availability, yield and uses. Data generated from the study were subjected to simple descriptive statistics and analysis of variance. Results obtained indicated that 48 % of the respondents reported the availability of S. birrea while 20 % indicated its scarcity. 43 % of the respondents reported the use of S. birrea as food and medicine for animal and man and 10 % reported its use as fuel and wood work. Kware local government had a significantly higher number of S. birrea trees compared to other locations (P<0.05). However, the yield obtainable was significantly higher in Bodinga and Rabah local government areas (P<0.05) compared to Kware and Wamakko. Results indicated that a total of 13,953; 10,377; 11,069 and 9,641 kg of S. birrea could be obtained from Kware, Bodinga, Rabah and Wammako Local Government areas annually. It was concluded that S. birrea is a potential feed supplement in the dry sub-humid zone of Nigeria.
Źródło:
World Scientific News; 2016, 46; 88-99
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the light absorption properties of particulate matter forming organic particles suspended in seawater. Part 2. Modelling results
Autorzy:
Wozniak, B.
Wozniak, S.B.
Tyszka, K.
Ostrowska, M.
Majchrowski, R.
Ficek, D.
Dera, J.
Powiązania:
https://bibliotekanauki.pl/articles/47522.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
light absorption coefficient
sea water
particulate organic matter
particulate matter
organic substance
Źródło:
Oceanologia; 2005, 47, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orientation States in Rhombic NdGaO$\text{}_{3}$
Autorzy:
Savytskii, D. I.
Ubizskii, S. B.
Vasylechko, L. O.
Syvorotka, I. M.
Matkovskii, A. O.
Powiązania:
https://bibliotekanauki.pl/articles/1964528.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
62.20.Dc
Opis:
The ferroelastic domain structure of NdGaO$\text{}_{3}$ is analyzed by three theories: group symmetry, tensor method and twinning by pseudosymmetry. The theories provide a coherent description of domain pairs and a determination of the position of W and S walls.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 231-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperelastic behavior of porcine aorta segment under extension-inflation tests fitted with various phenomenological models
Autorzy:
Veljković, D. Ž.
Ranković, V. J.
Pantović, S. B.
Rosić, M. A.
Kojić, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/307016.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
parametry mechaniczne
aorta
badania na zwierzętach
identyfikacja
material parameters identification
mechanical properties
porcine aorta
strain energy function
Opis:
Most of hyperelastic models for the constitutive modeling of the typical mechanical behaviour of the arterial wall tissue in literature are based on the test data from different animals and arteries. This paper is concerned with the material parameter identification of several phenomenological hyperelastic models by fitting the data from five extension-inflation tests of the porcine aorta segment, carried out in our laboratory. A membrane approximation is used to compute stresses and strains achieved during experiments, with usual assumption of material incompressibility. Three orthotropic two-dimensional strain-energy functions, based on use of the Green-Lagrange strains, are fitted to the test data: the well-known Fung’s exponential model; the classical polynomial model with seven constants; and the logarithmic model; as also, two three-dimensional models are employed: polyconvex anisotropic exponential hyperelastic model and the convex isotropic exponential rubber-like hyperelastic constitutive law depending on the first invariant of the right Cauchy-Green deformation tensor. It is found that isotropic model overestimates values of stresses in axial, and underestimates values of stresses in circumferential direction of artery segment, due to pronounced tissue anisotropy. Also, all considered two-dimensional models give good and similar prediction, while the polyconvex model demonstrates slightly lower performance in the axial direction of artery.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 3; 37-45
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality assessment of the essential oil from Eucalyptus globulus Labill of Blida (Algeria) origin
Autorzy:
Boukhatem, M. N.
Amine, F. M.
Kameli, A.
Saidi, F.
Walid, K.
Mohamed, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/411538.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Eucalyptus globulus Labill
Chemical composition
Essential oil
Gas Chromatography
Eucalyptol
Opis:
Despite the reputation earned by aromatic and medicinal plants of Algeria, the chemical constituents of Eucalyptus globulus essential oil (EGEO) of Blida origin has not previously been investigated. Thus, the present study has been conducted for the determination of chemical constituents and different physico-chemical properties of the EGEO. Chemical composition of the EGEO, grown in Algeria, was analysed by Gas Chromatography-Mass Spectrometry. The chemical components were identified on the basis of Retention Time and comparing with mass spectral database of standard compounds. Relative amounts of detected compounds were calculated on the basis of GC peak areas. Fresh leaves of E. globulus on steam distillation yielded 0.96 % (v/w) of essential oil whereas the analysis resulted in the identification of a total of 11 constituents, 1.8 cineole (85.8 %), α-pinene (7.2 %), and β-myrcene (1.5 %) being the main components. Other notable compounds identified in the oil were β-pinene, limonene, α-phellandrene, γ-terpinene, linalool, pinocarveol, terpinen-4-ol, and α-terpineol. The physical properties such as specific gravity, refractive index and optical rotation and the chemical properties such as saponification value, acid number and iodine number of the EGEO were examined. The oil extracted has been analyzed to have 1.4602 - 1.4623 refractive index value, 0.918 - 0.919 specific gravity (sp.gr.), +9 - +10 optical rotation that satisfy the standards stipulated by European Pharmacopeia. All the physical and chemical parameters were in the range indicated by the ISO standards. Our findings will help to access the quality of the Eucalyptus oil which is important in the production of high value essential oils that will help to improve the economic condition of the community as well as the nation.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 303-315
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Optimal Noise Hazard Control Strategy With Budget Constraint
Autorzy:
Monazzam, M. R.
Fard, S. M. B.
Powiązania:
https://bibliotekanauki.pl/articles/90404.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
noise control strategy
noise hazard
optimization
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 463-464
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pathogenicity of Phytophthora isolates originating from several woody hosts in Bulgaria and Poland
Autorzy:
Lyubenova, A.B.
Nowakowska, J.A.
Sikora, K.
Kostov, K.
Borys, M.
Slavov, S.B.
Oszako, T.
Powiązania:
https://bibliotekanauki.pl/articles/38488.pdf
Data publikacji:
2016
Wydawca:
Instytut Badawczy Leśnictwa
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2016, 58, 3
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAC-OCDMA over Hybrid FTTx Free Space Optical Communication Networks
Autorzy:
Sahbudin, R. K. Z.
Chun, T. T. K.
Anas, S. B. A.
Hitam, S.
Mokhtar, M.
Powiązania:
https://bibliotekanauki.pl/articles/308402.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Hybrid FTTx free space optical
Khazani-Syed code
SAC-OCDMA
Spectral direct decoding
Opis:
This paper presents an investigation of Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) over hybrid Fiber-to-the-x (FTTx) Free Space Optical (FSO) link under different weather conditions. FTTx and FSO are the last mile technologies that complement each other in delivering secure and high speed communication to customers' residence or office. SAC-OCDMA is one of the potential multiplexing techniques that has become a research area of interest in optical communications and considered a promising technique for FTTx access networks. It is based on Khazani-Syed (KS) code with Spectral Direct Decoding (SDD) technique. All the components involved in the network were specied according to the available market product in order to simulate the actual environment as close as possible. The result shows that for bit error rate (BER) of 10‾9, the network is able to perform with 20 km Single Mode Fiber (SMF) spanning from the central office (CO) and 1.48 km FSO range with transmission rate of 1.25 Gb/s during heavy rain.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 2; 52-58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Colour Centres in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Single Crystals
Autorzy:
Ubizskii, S. B.
Savytskii, D.I.
Olijnyk, V. Ya.
Matkovskii, A. O.
Gloubokov, A.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964350.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.82.Ms
Opis:
Absorption spectra of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals are investigated as well as their changes after irradiation by γ-quanta ($\text{}^{60}$Co source). Both crystals reveal a similar behaviour that is caused, as it seems, by the same nature of colour centres in them. The conclusion that oxygen defects as well as Fe impurities play a significant role in the colour centres formation in these crystals.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 163-168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition and biological activities assessment of olive fruit volatiles from different varieties grown in Tunisia
Autorzy:
Mansour-Gueddes, S.B.
Saidana, D.
Jabnoun-Khiareddine, H.
Bchir, A.
Daami-Remadi, M.
Braham, M.
Powiązania:
https://bibliotekanauki.pl/articles/12702502.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Volatile compounds, present in olives, are responsible for the olive fruit flavor and oil aroma, influencing the consumer’s preference. These compounds have a biological activity to fight off pathogens. The aim of this work is to characterize volatiles in pulps and cores of Chemlali, Arbequina and Koroneiki olives, collected from Menzel Mhiri-Kairouan, and to test both the efficiency of these compounds against two bacteria and six phytopathogenic fungal species, by diffusion and dilution methods, and their antioxidants activities. The analyzis of volatiles were determined by GC-FID and GC-MS in three cultivars at the full ripening stage. Thirty five compounds were identified, such us an assortment of phenol, alcohol, hydrocarbon, aldehyde and terpenes derivatives. A high changes in volatiles was noted between cultivars and fruit organs. In fact, the major compounds in the pulps and the cores, of different cultivars, are (E)-2-decenal (46.9%), nonanal (19.6%), 1-hexadecene (16.3%), 7-methyl-1,3,5-cycloheptatriene 7-methyl-1,3,5-cycloheptatriene (15.47%), (E,E)-2,4-decadienal (14.5%) and 1-tetradecene (14.6%). Also, the cores volatiles illustrated more richness in aldehydes than the pulps for all cultivars. Volatile fractions exhibited a moderate to important antibacterial activities against bacteria. However, Arbequina cores volatiles and both Chemlali and Koroneiki pulps volatiles established a moderate to higher activities against tested fungi. The DPPH and ABTS˙⁺ tests demonstrated that the highest antioxidant capacity of volatiles were assigned to Arbequina cores and Koroneiki pulps. The Principal Components Analysis showed a significant relationship between antioxidants and/or antimicrobial properties and the levels of the main volatile compounds (limonene, methyldecane, nonanal, E-2-decenal, camphor, geranic acid, tetradecene, hexadecane, tetradecane) in different fruit organs.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 4; 3-20
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of extraction equilibria in the reaction of alkaline hydrolysis of activated amino acid esters
Badanie równowag ekstrakcji w reakcji zasadowej hydrolizy aktywowanych estrów aminokwasów
Autorzy:
Doroshkevich, V. S.
Baranova, O. V.
Shendrik, A. N.
Doroshkevich, A. S.
Lygina, O. S.
Lyubchyk, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/951561.pdf
Data publikacji:
2014
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
phase-transfer catalysis
kinetics
hydrolysis
quaternary phosphonium salts
branched catalytic cycle
extraction equilibria
kataliza przejścia fazowego
kinetyka
hydroliza
czwartorzędowe sole fosfoniowe
rozgałęziony cykl katalityczny
równowaga ekstrakcji
Opis:
Correlation between observed kinetic effects of phase-transfer catalytic reaction of the alkaline hydrolysis of 4-nitrophenyl ester of N-benzyloxycarbonylglycine-4 in the two-phase system chloroform-borate buffer pH = 10 and a content of ionic forms of catalyst was investigated. The phosphonium salts QX (X = Cl¯, Br¯, I¯) shows high catalytic reactivity. Dependence of the reaction kinetics discussed in the framework of the extraction mechanism with a competitive extraction of a nucleophile ОН¯, nucleofuge 4-NO2C6H4O¯ and anion X¯ of the phase-transfer catalyst.
Zbadano korelację pomiędzy obserwowanym efektem kinetycznym przejścia fazowego katalitycznej reakcji zasadowej hydrolizy estru 4-nitrofenylowego N-benzyloksycarbonylglycyny-4 w dwufazowym układzie chloroform-bufor boranowy, pH = 10, z zawartością jonowych form katalizatora. Sole fosfoniowe QX (X = Cl¯, Br¯, I¯) wykazują wysoką aktywność katalityczną. Zależności kinetyki reakcji przeanalizowano w ramach mechanizmu ekstrakcji z konkurencyjną ekstrakcją nukleofilu ОН¯, grupą odchodzącą 4-NO2C6H4O¯ i anionem X¯ katalizatora przejścia fazowego.
Źródło:
Chemistry-Didactics-Ecology-Metrology; 2014, 19, 1-2; 69-77
2084-4506
Pojawia się w:
Chemistry-Didactics-Ecology-Metrology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithms for the remote sensing of the Baltic ecosystem (DESAMBEM). Part 2: Empirical validation
Autorzy:
Darecki, M.
Ficek, D.
Krezel, A.
Ostrowska, M.
Majchrowski, R.
Wozniak, S.B.
Bradtke, K.
Dera, J.
Wozniak, B.
Powiązania:
https://bibliotekanauki.pl/articles/47590.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
light-photosynthesis model
algorithm
chlorophyll
ocean colour
temperature
marine ecosystem
monitoring
empirical validation
primary production
Baltic ecosystem
remote sensing
Opis:
This paper is the second of two articles on the methodology of the remote sensing of the Baltic ecosystem. In Part 1 the authors presented the set of DESAMBEM algorithms for determining the major parameters of this ecosystem on the basis of satellite data (see Woźniak et al. 2008 – this issue). That article discussed in detail the mathematical apparatus of the algorithms. Part 2 presents the effects of the practical application of the algorithms and their validation, the latter based on satellite maps of selected Baltic ecosystem parameters: the distributions of the sea surface temperature (SST), the Photosynthetically Available Radiation (PAR) at the sea surface, the surface concentrations of chlorophyll a and the total primary production of organic matter. Particular emphasis was laid on analysing the precision of estimates of these and other parameters of the Baltic ecosystem, determined by remote sensing methods. The errors in these estimates turned out to be relatively small; hence, the set of DESAMBEM algorithms should in the future be utilised as the foundation for the effective satellite monitoring of the state and functioning of the Baltic ecosystem.
Źródło:
Oceanologia; 2008, 50, 4; 509-538
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Efficiency of the Luminescence of Ytterbium(III) ß-Diketonates
Autorzy:
Meshkova, S. B.
Topilova, Z. M.
Bolshoy, D. V.
Beltyukova, S. V.
Tsvirko, M. P.
Venchikov, V. Ya.
Powiązania:
https://bibliotekanauki.pl/articles/2010953.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
Opis:
The processes of the energy deactivation of electronic excitation in Yb(III) ß-diketonates and their dependence on the nature of ß-diketone and the second ligand as well as the environment and its state (complexes in organic solvents and polymer matrix) were studied. Taking as an example the ytterbium thenoyltrifluoroacetonate, it was shown that the energy losses in the ligand and Yb(III) ion, which is due to the high-frequency vibrations of the central C-H group of the ß-diketone, can lead to the decreased quantum yield of the luminescence. The increase in the medium rigidity causes the decrease in losses in the ligand, but does not affect the deactivation of the Yb(III) ion excited level. In the mix-ligand complexes the second ligand (1,10-phenanthroline) improves the screening of the central ion providing almost full transfer of the energy, absorbed by ligand, to ytterbium ion.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 983-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-temporal variation of microphytoplankton in the upwelling system of the South-Eastern Arabian Sea during the summer monsoon of 2009
Autorzy:
Thomas, L.C.
Padmakumar, K.B.
Smitha, B.R.
Asha Devi, C.R.
Nandan, S.B.
Sanjeevan, V.N.
Powiązania:
https://bibliotekanauki.pl/articles/49085.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Arabian Sea
upwelling
coastal water
phytoplankton
chlorophyll a
diatom
centric diatom
spatio-temporal variability
microphytoplankton
Chaetoceros
Źródło:
Oceanologia; 2013, 55, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of chemical and physical properties on flowability characteristics of corn distillers dried grains with solubles
Autorzy:
Pekel, A.Y.
Calik, A.
Kuter, E.
Alatas, M.S.
Oklen, S.B.
Kizil, A.
Bulat, M.
Cengiz, O.
Powiązania:
https://bibliotekanauki.pl/articles/2082879.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
angle of repose
bulk density
compressibility
distillers dried grains with solubles
flowability
Opis:
The influence of the physical and chemical composition of corn distillers dried grains with solubles on its flowability was evaluated in the current study. The samples were evaluated for angle of repose, compressibility, Hausner ratio, tapped density, bulk density, mean bulk density, colour and nutrient content. PROC CORR and REG procedures were used to determine correlations. The ether extract was negatively correlated with crude protein and redness (a*), while crude protein was negatively correlated with yellowness (b*). Acid detergent fibre and neutral detergent fibre were negatively correlated with a* and positively correlated with lightness (L*), respectively. Compressibility showed a negative correlation with bulk density. Bulk density, tapped density and mean bulk density did not impact the angle of repose. The angle of repose was positively correlated with the compressibility and Hausner ratio. Apart from the correlation between acid detergent fibre and tapped density, the angle of repose and other physical parameters were not affected by the nutrient composition of the distillers dried grains with solubles samples. In conclusion, the results of this study indicate that nutrient composition has little influence over the flowability of distillers dried grains with solubles but compressibility and the Hausner ratio can be used to predict the potential flow characteristics of corn distillers dried grains with solubles.
Źródło:
International Agrophysics; 2020, 34, 2; 195-202
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for the remote sensing of the Baltic ecosystem (DESAMBEM). Part 1: Mathematical apparatus
Autorzy:
Wozniak, B.
Krezel, A.
Darecki, M.
Wozniak, S.B.
Majchrowski, R.
Ostrowska, M.
Kozlowski, L.
Ficek, D.
Olszewski, J.
Dera, J.
Powiązania:
https://bibliotekanauki.pl/articles/47484.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
light-photosynthesis model
algorithm
chlorophyll
mathematical apparatus
temperature
primary production
Baltic ecosystem
remote sensing
Opis:
This article is the first of two papers on the remote sensing methods of monitoring the Baltic ecosystem, developed by our team. Earlier, we had produced a series of detailed mathematical models and statistical regularities describing the transport of solar radiation in the atmosphere-sea system, the absorption of this radiation in the water and its utilisation in a variety of processes, most importantly in the photosynthesis occurring in phytoplankton cells, as a source of energy for the functioning of marine ecosystems. The comprehensive DESAMBEM algorithm, presented in this paper, is a synthesis of these models and regularities. This algorithm enables the abiotic properties of the environment as well as the state and the functioning of the Baltic ecosystem to be assessed on the basis of available satellite data. It can be used to determine a good number of these properties: the sea surface temperature, the natural irradiance of the sea surface, the spectral and spatial distributions of solar radiation energy in the water, the surface concentrations and vertical distributions of chlorophyll a and other phytoplankton pigments in this sea, the radiation energy absorbed by phytoplankton, the quantum efficiency of photosynthesis and the primary production of organic matter. On the basis of these directly determined properties, other characteristics of processes taking place in the Baltic ecosystem can be estimated indirectly. Part 1 of this series of articles deals with the detailed mathematical apparatus of the DESAMBEM algorithm. Part 2 will discuss its practical applicability in the satellite monitoring of the sea and will provide an assessment of the accuracy of such remote sensing methods in the monitoring of the Baltic ecosystem (see Darecki et al. 2008 – this issue).
Źródło:
Oceanologia; 2008, 50, 4; 451-508
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of total petroleum hydrocarbons and polycyclic aromatic hydrocarbons in Musa Bay sediments (northwest of the Persian Gulf)
Autorzy:
Tehrani, G. M.
Hashim, R.
Sulaiman, A. H.
Sany, S. B. T.
Salleh, A.
Jazani, R. K.
Savari, A.
Barandoust, R. F.
Powiązania:
https://bibliotekanauki.pl/articles/207391.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
polycyclic aromatic hydrocarbons
PAH
petroleum chemistry
coastal area
hydrocarbon contamination
Persian Gulf
special economic zones
petroleum hydrocarbons
wielopierścieniowe węglowodory aromatyczne
WWA
ropa naftowa
pas przybrzeżny
zanieczyszczenia węglowodorami
Zatoka Perska
specjalna strefa ekonomiczna
węglowodory ropopochodne
zanieczyszczenia ropopochodne
zanieczyszczenia substancjami ropopochodnymi
Opis:
Sediment samples were collected from the coastal area of the Petrochemical Special Economic Zone of Musa Bay. The samples were analyzed to determine the degree of hydrocarbon contamination and identify the sources of PAHs which were evaluated by employing the ratios of specific PAHs compounds and principal component analysis (PCA). The levels of TPH concentration in the studied area were relatively moderate compared to the world-wide chronically oil-contaminated locations. The concentration of total PAHs was lower than those in other parts of the Musa Bay but approached the NOAA sediment quality guideline value.
Źródło:
Environment Protection Engineering; 2013, 39, 1; 115-128
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 2865

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