Informacja

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

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "(s.b.)." wg kryterium: Autor

  Lista filtrów

Dostawca treści

Podbaza

Wyrównaj
Wyświetlanie 1-50 z 2858
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
Wyświetlanie 1-50 z 2858

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