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Tytuł:
International diversification in the periods of major economic changes
Autorzy:
Gluzicka, Agata
Powiązania:
https://bibliotekanauki.pl/articles/580733.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
diversification
Rao’s Quadratic Entropy
Portfolio Diversification Index
Most Diversified Portfolio
Opis:
Diversification is one of the most important elements considered in the process of the construction of investment portfolios. A special role is attributed to the diversification in periods of rapid changes in the financial markets. In the article, the problem of international diversification was analysed on the example of selected European, American and Asian markets. The level of diversification was assessed by various measures: Portfolio Diversification Index, Rao’s Quadratic Entropy and Diversification Ratio. In the study diversified portfolios were compared. These portfolios were constructed for the data from the periods before, during and after the last economic crisis. The conducted research showed that European markets were most diversified, regardless of the nature of the analysed period. The study also showed that strongly interrelated countries did not necessarily have strong influence on diversification.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2018, 519; 77-87
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro seed germination and Embryo Culture in Nothapodytes foetida (Wight) Sleumer
Autorzy:
Kaveri, S.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/10761.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
In vitro seed germination and embryo culture have been achieved in Nothapodytes foetida, this plant is known for its rich source of anticancer drug i. e., Camptothecin. In present study both normal and decoated seeds were subjected to different treatments viz., H2O, GA3, H2O2, H2SO4, chlorine water and mechanical scarification, further these were germinated on water agar medium (WA), filter paper bridge (FB), half strength MS (HMS) and full strength MS (FMS) medium. The highest percentage (69%) of germination was achieved from decoated seeds treated with 10mg/L GA3 and germinated on Filter Paper Bridge. And for embryo culture mature embryos were inoculated on MS medium containing various combination and concentrations of cytokinins (BAP, Kn and TDZ) and auxin (IAA and NAA) for rapid conversion into a plantlet. Among the different combinations of growth regulators; highest frequency (100%) of plantlet conversion was obtained on MS medium containing Kn (1.0mg/L) and NAA (0.2mg/L).
Źródło:
International Letters of Natural Sciences; 2015, 48
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie portfeli zdywersyfikowanych do oceny zdolności inwestycyjnej województw Polski
Application of diversified portfolios for investment capacity evaluation of Polish Voivodeships
Autorzy:
Gluzicka, Agata
Powiązania:
https://bibliotekanauki.pl/articles/589783.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Dywersyfikacja
Kwadratowa entropia Rao
Portfele najbardziej zdywersyfikowane
Współczynnik dywersyfikacji
Diversification
Diversification ratio
Most diversified portfolio
Rao’s quadratic entropy
Opis:
Ocena atrakcyjności inwestycyjnej regionów jest istotnym elementem w planowaniu rozwoju regionalnego. Zazwyczaj ocena taka dokonywana jest na podstawie różnych czynników, dobieranych zgodnie z przeznaczeniem danej inwestycji. W artykule omówione zostały wyniki badań dotyczących oceny atrakcyjności inwestycyjnej województw Polski przeprowadzonej na podstawie wybranych spółek z GPW w Warszawie. Do oceny zastosowano trzy kryteria: stopę zwrotu, ryzyko i poziom dywersyfikacji portfela inwestycyjnego. Poziom dywersyfikacji oceniany był dla portfeli najbardziej zdywersyfikowanych i portfeli optymalnych w sensie kwadratowej entropii Rao. Analiza rankingów województw według atrakcyjności inwestycyjnej wykazała, że rankingi te mogą posłużyć jako wskazówki dla inwestorów giełdowych przywiązujących wagę do dywersyfikacji portfela.
The evaluation of the investment attractiveness of regions is an essential element in the process of regional development planning. Usually many different factors are taken into account to carry out such an assessment. These factors are selected according to given investment. A special case investors are stock exchange investors. In article the results of research on investment assessment of Polish voivodeships on the basis of selected companies from Warsaw Stock Exchange were presented. The voivodeships were compared according to rates of return, risk, diversification ratio and Rao’s quadratic entropy (also diversification measure). Additionally, the obtained results were compared with the voivodeships rankings according to the investment attractiveness. The purpose of this part of research was to determine if such rankings could be used as a guide for stock market investors.
Źródło:
Studia Ekonomiczne; 2018, 353; 20-32
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convexity of a class of functions related to classes of starlike functions and functions with boundary rotation
Autorzy:
Bhargava, S.
Nanjunda Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/716237.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Annales Polonici Mathematici; 1988-1989, 49, 3; 229-235
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poziom dywersyfikacji a dochodowość portfela inwestycyjnego na przykładzie portfeli kryptowalut
Level of diversification and profitability of the investment portfolios on the example of cryptocurrency portfolios
Autorzy:
Kądziołka, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/2097941.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorska Szkoła Biznesu w Szczecinie
Tematy:
poziom dywersyfikacji
kwadratowa entropia RAO
kryptowaluty
portfele kryptowalut
portfel Markowitza
portfel o równych wagach
ryzyko
diversification
Rao’s quadratic entropy
cryptocurrency
cryptocurrency portfolio
risk
Markowitz portfolio
naive portfolio
Opis:
W pracy dokonano oceny zależności między oczekiwaną i rzeczywistą stopą zwrotu a poziomem dywersyfikacji portfeli inwestycyjnych mierzonym za pomocą kwadratowej entropii Rao. Wybrano arbitralnie 13 kryptowalut mogących wejść w skład portfela a analizy prowadzono dla dwóch arbitralnie wybranych okresów. Tworząc portfele uwzględniono wszystkie możliwe k – elementowe (k=2,…,13) podzbiory początkowego zbioru kryptowalut. W ten sposób uzyskano 8178 portfeli o równych wagach i tyle samo portfeli Markowitza. W obu analizowanych okresach występowała dodatnia korelacja między poziomem dywersyfikacji a oczekiwaną stopą zwrotu portfeli. Natomiast współczynniki korelacji między oczekiwaną i rzeczywistą stopą zwrotu były ujemne. Portfele znajdujące się na granicy efektywnej ani portfele charakteryzujące się wyższym poziomem dywersyfikacji nie gwarantowały uzyskania wyższej rzeczywistej stopy zwrotu niż inne portfele. Z kolei posiadanie w portfelu instrumentów o silnie dodatnio skorelowanych stopach zwrotu nie było jednoznaczne z tym, że wszystkie one jednocześnie przyniosą zysk lub stratę. W okresie I większość portfeli Markowitza pozwoliła uzyskać wyższą stopę zwrotu niż portfele o równych wagach. W okresie II było odwrotnie. Żadna z rozważanych metod nie umożliwiła w obu okresach częstszego osiągnięcia wyższych stóp zwrotu. Zatem żadna z tych metod nie umożliwia w dowolnym okresie generowania przeciętnie większych zysków.
Article presents the results of analysis of the relationship between expected and real rate of return and the level of diversification of investment portfolios measured with the Rao’s quadratic entropy. There were arbitrarily selected 13 cryptocurrencies that could be included in the portfolio. The analyzes were conducted for two arbitrarily selected periods. To create the portfolios, all possible k-element (k = 2, ..., 13) subsets of the initial set of cryptocurrencies were taken into account. There was a positive correlation between the level of diversification and expected rate of return in both analyzed periods. On the other hand, the correlation coefficients between expected and real rate of return were negative. Neither portfolios from efficient frontier nor portfolios with a highest degree of diversification do not guarantee a higher real rate of return than other portfolios. In period I, most of the Markowitz portfolios allowed to achieve a higher rate of return than equal weights portfolios. In period II most of the Markowitz portfolios were worse than naive portfolios. None of the considered methods allowed to achieve higher rates of return more frequently in both periods.
Źródło:
Zeszyty Naukowe ZPSB Firma i Rynek; 2020, 2(58); 18-27
2657-3245
Pojawia się w:
Zeszyty Naukowe ZPSB Firma i Rynek
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Callus induction and Organogenesis in Sugarcane (Saccharum officinarum L.) var 93v297
Autorzy:
Rao, A.S.
Powiązania:
https://bibliotekanauki.pl/articles/11297.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
An efficient protocol for induction of callus and regeneration of a sugar cane var 93v297 has been developed and reported here. Callus induction from immature young leaf explants derived from 2-3-month-old plants was achieved on Murashige and Skoog’s (MS) medium supplemented with different auxins viz, 2,4-D, NAA and IAA. Among different auxins, 2, 4-D at 3.5mg/l + 0.5mg/l BAP was found favourable in inducing callus. Addition of coconut milk and BAP further enhanced the growth of callus maximum being on MS medium supplemented with 0.5mg/l BAP (3602.33±0.88mg). Calli were further evaluated for regeneration. MS medium supplemented with 1.0 mg/l BAP was found suitable where 100% calli regenerated with maximum number of multiple shoots per callus mass (41.40±0.89). Highest number of root emergence (28.33±1.16) and maximum root length (3.40±0.67cm) was achieved on MS medium supplemented with 3mgl/l NAA. The in vitro grown plants were transferred to polycups containing a mixture of sterilized sand, soil and cocopeet (1:1:1) for hardening. The hardened plants were transferred to green-house conditions where they survived with 90% frequency.
Źródło:
International Letters of Natural Sciences; 2015, 48
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors affecting the mechanical properties of compact bone and miniature specimen test techniques: a review
Autorzy:
Chittibabu, V.
Rao, S. K.
Rao, G. P.
Powiązania:
https://bibliotekanauki.pl/articles/103085.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mechanical properties
compact bone
miniature specimen
small punch test
finite element simulation
inverse finite element procedure
Opis:
This paper presents the review concerning mechanical properties of bone and the miniature specimen test techniques. For developing a realistic understanding of how factors such as moisture content, mineralization, age, species, location, gender, rate of deformation etc. affect the mechanical properties of bone, it is critical to understand the role of these factors. A general survey on existing research work is presented on this aspect. The essential features of miniature specimen test techniques are described, along with the application of small punch test method to evaluate the mechanical behavior of materials. The procedure for the determination of tensile and fracture properties, such as: yield strength, ultimate strength, ductility, fracture toughness etc. using small punch test technique have been described. The empirical equations proposed by various investigators for the prediction of tensile and fracture properties are presented and discussed. In some cases, the predictions of material properties have been essentially made through the finite element simulation. The finite element simulation of miniature specimen test technique is also covered in this review. The use of inverse finite element procedure for the prediction of uniaxial tensile constitutive behaviour of materials is also presented.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 169-183
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid effects of stirrup ratio and steel fibers on shear behaviour of self-compacting concrete
Hybrydowy wpływ stosunku strzemion i włókien stalowych na ścinanie betonu samozagęszczalnego
Autorzy:
Kannam, P.
Venkateswara Rao, S.
Pancharathi, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/230257.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beton samozagęszczalny
wytrzymałość na ścinanie
beton zbrojony
ścinanie spowodowane zginaniem
strzemiono
włókno stalowe
self compacting concrete
shear strength
reinforced concrete
flexural-shear failure
stirrup
steel fiber
Opis:
Shear cracking behaviour of fibrous self-compacting concrete of normal and high strength grade (M30 and M70) is presented here. Two stirrup diameters (6mm Φ and 8 mm Φ) with a constant steel fiber content of 38 kg/m3 (0.5% by volume of concrete) were selected for the present study. The size of the beam was fixed at 100x200x1200mm. The clear span of the beam 1100mm, was maintained throughout the study. A total of 16 shear-deficient beams were tested under three point loading. Two stirrup spacing (180 mm and 360 mm) are used for the shear span-to-depth ratio (a/d = 2). Investigation indicates that initial cracking load and ultimate load increased as the area of shear reinforcement increased by increasing the diameter of stirrup. It was also noted that the failure mode was modified from brittle shear failure to flexural-shear failure in the presence of fibers. The mechanical behaviour of SFRSCC was improved due to the combined effect of stirrups and steel fibers. The stiffness, toughness, and deflection of the beams increased when compared to SCC beams without fibers. The experimental results were compared with existing models available in literature, and the correlation is satisfactory.
Spośród wszystkich rodzajów uszkodzeń betonu, ścinanie jest nagłe i kruche i pojawia się gwałtownie, bez ostrzeżenia. Aby uniknąć tego rodzaju problemów z betonem, belki są tradycyjnie wzmacniane za pomocą strzemion, w bliższej odległości od konstrukcji. Ograniczone rozmieszczenie prętów zbrojeniowych i strzemion na elementach wykonanych z betonu zbrojonego (RC), takich jak słupy, belki i płyty, utrudnia zagęszczanie betonu w każdym miejscu w szalunku za pomocą wibratorów mechanicznych. Pustki i makropory wewnątrz betonu powstają w wyniku nieodpowiednich drgań, a zatem zagęszczenie może wpływać na wytrzymałość mechaniczną i trwałość betonu, a także stać się możliwą przyczyną pogorszenia jego jakości. Beton konwencjonalny stosowany w budownictwie i inżynierii lądowej wymaga zagęszczania w celu uzyskania wytrzymałości, trwałości i konsystencji. Ta klasyczna metoda zagęszczania i drgań powoduje zakłócenia i dodatkowe koszty dla projektów, a ponadto stanowi poważne zagrożenie dla zdrowia na i w okolicach placu budowy. Beton samozagęszczalny (SCC), jak sama nazwa wskazuje, nie wymaga zewnętrznego wysiłku przy zagęszczaniu. Jest to dobrze przemyślane rozwiązanie, mające na celu pozbycie się powyższego problemu. Ze względu na wyżej opisaną właściwość, nie potrzeba drgań, a więc nie powstają również zanieczyszczenia hałasem, zmniejszają się koszty robocizny i beton może być zagęszczany w każdym miejscu szalunku, bez jakiejkolwiek znaczącej segregacji, przeważnie w zatkanych wzmocnieniach. W niniejszej pracy przedstawiono charakterystykę pękania przy ścinaniu włóknistego betonu samozagęszczalnego o normalnym i wysokim stopniu wytrzymałości (M30 i M70). W niniejszej pracy zastosowano dwie średnice strzemion (6 mm i 8 mm) o stałej zawartości włókien stalowych wynoszącej 38 kg/m3 (0.5% objętości betonu). Rozmiar belki został ustalony na 100 x 200 x 1200 mm. Przez cały okres trwania badania utrzymywano rozstaw belek wynoszący 1100 mm. Łącznie zbadano 16 belek z niedostatnim ścinaniem przy obciążeniu trzypunktowym. Dwa rozstawy strzemion (180 mm i 360 mm) są stosowane dla stosunku ścinania do głębokości (a/d = 2). Badanie wykazało, że początkowe obciążenie przy pękaniu oraz końcowe obciążenie wzrosły wraz ze wzrostem średnicy strzemienia. Zauwaono również, ze tryb awaryjny zmienił sie z kruchego ścinania na scinanie spowodowane zginaniem przy obecności włókien. Zachowanie mechaniczne SFRSCC uległo poprawie w wyniku połączonego efektu działania strzemion i włókien stalowych. Sztywność, wytrzymałość i ugięcie belek wzrosły w porównaniu do belek SCC bez włókien. Wyniki eksperymentalne zostały porównane z istniejącymi modelami dostępnymi w literaturze, a korelacja okazała się być zadowalająca.
Źródło:
Archives of Civil Engineering; 2018, 64, 1; 145-169
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methanogens in the environment: an insight of methane yield and impact on global climate change
Autorzy:
Kumar Pandey, A.
Das, N.
Muthu Kumar, A.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/11130.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Methane is a most important greenhouse gas for planetary heating and it’s produced by methanogenic microorganisms as a metabolic byproduct and creates climate change. Methanogens are ancient organisms on earth found in anaerobic environments and methane is a key greenhouse gas concerned with methanogens. Therefore here is intense interest to writing this paper. A number of experiments have already conducted to study the methanogens in various environments such as rumen and intestinal system of animals, fresh water and marine sediments, swamps and marshes, hot springs, sludge digesters, and within anaerobic protozoa which utilize carbon dioxide in the presence of hydrogen and produce methane. The diversity of methanogens, belong to the domain Archaea and get involved in biological production of methane that catalyzes the degradation of organic compound as a part of global carbon cycle called methanogenesis. Majorly in this article we summaries the diversity of methanogens and their impact on global warming.
Źródło:
International Letters of Natural Sciences; 2015, 37
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global scenario of Acrocarpus fraxinifolius Wight and Arn. - A future tree of Agro forestry
Autorzy:
Mishra, G.
Pandey, A.K.
Arunachalam, M.K.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/11909.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Acrocarpus fraxinifolius portrait one among the mainstay of agro forestry in Asian tropics. The lofty tree fortified a substantial impact in every horizon of life. The evergreen, deciduous tree of Fabaceae family stands tall about 30-60 m endowed with unique properties which idiosyncrasies it in the plant kingdom. Surpassing the adverse climatic conditions, A. fraxinifolius serves as a shade tree for tea and coffee plantation and epitomises as a multipurpose avenue tree culminating to the culture of agro forestry. Mundani in bloom is a spectacular appearance bestowed with scarlet crimson red flowers attracting infinite migratory birds and insects. The ancestral gene with indelible memory gravitate this extraordinary majestic tree to aestivate and adapt to strongest survive.
Źródło:
International Letters of Natural Sciences; 2015, 03
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A report on occurrence of Neofusicoccum sp. in Carallia brachiata (Lour.) Merr. trees from Karnataka, India
Autorzy:
Muthu Kumar, A.
Pandey, A.K.
Mishra, G.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/11572.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Carallia brachiata (Lour.) Merr. is one of the soft woody species occurring all along the Western Ghats region of Kundapura, Karnataka, India. The species is considered to be a potent medicinal plant exclusively used against itch and septic poisoning. A study was under gone based on the report of forest department (Karnataka) on mortality of Carallia brachiata. Observation of symptoms on the infected trees and experimental analysis of the samples under laboratory conditions revealed the incidence of Neofusicoccum sp., a first report on Carallia brachiata. This particular Neofusicoccum sp. belongs to Botryospaeriaceae family, and is considered to be an important fungal pathogen associated with tree decline in forest and plantation worldwide.
Źródło:
International Letters of Natural Sciences; 2015, 04
2300-9675
Pojawia się w:
International Letters of Natural Sciences
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:
A hybridized approach for design and optimization of ORPD under unbalanced conditions
Autorzy:
Shareef, S. M.
Rao, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/1839102.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
ORPD
power loss
voltage profile
Cuckoo Search
Glow Worm Swarm
Opis:
The issue of ORPD (Optimal Reactive Power Dispatch) for enhancing security and economy of a power system has been given substantial consideration in recent days. The major inspiration behind deploying an ORPD system for enhancing power system efficiency is to reallocate the RP (reactive power) in such a manner that power loss be minimized, and voltage profiles get enhanced. Hence, this paper concerns the major objectives, namely, reduction of power loss and voltage deviation that are related to solving ORPD problem under unbalanced condition. To attain these objectives, an amalgamation of two algorithms, called CS (Cuckoo Search) and GWSO (Glow Worm Swarm), is adopted for optimizing, and hence the proposed model is referred to as CP-GWSO. This algorithm functions with the control parameters, namely load reactance, voltage and transformer tap settings that are tuned to attain the optimum outcome. The entire empirical part of the investigations is performed on two IEEE standard test bus systems, the IEEE 14 and the IEEE 39 bus systems. Finally, the proposed scheme is compared to the conventional methods, and its efficiency is confirmed.
Źródło:
Control and Cybernetics; 2018, 47, 4; 309-328
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of knock suppression characteristics in a boosted methane : gasoline blended fuelled SI engine
Autorzy:
Yang, Z.
Miganakallu, N.
Rao, S.
Harsulkar, J.
Naber, J.
Lonari, Y.
Szwaja, S.
Powiązania:
https://bibliotekanauki.pl/articles/244629.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
knock
methane
gasoline
E10
blend fuel
knock onset prediction
simulation
Opis:
Natural gas has a higher knock suppression effect than gasoline which makes it possible to operate at higher compression ratio and higher loads resulting in increased thermal efficiency in a spark ignition engine However, using port fuel injected natural gas instead of gasoline reduces the volumetric efficiency from the standpoints of the charge displacement of the gaseous fuel and the charge cooling that occurs from liquid fuels. This article investigates the combustion and engine performance characteristics by utilizing experimental and simulation methods varying the natural gas-gasoline blending ratio at constant engine speed, load, and knock level. The experimental tests were conducted on a single cylinder prototype spark ignited engine equipped with two fuel systems: (i) a Direct Injection system for gasoline and (ii) a Port Fuel Injection (PFI) system for compressed natural gas. For the fuels, gasoline with 10% ethanol by volume (commercially known as E10) with a research octane number of 91.7 is used for gasoline via the DI system, while methane is injected through PFI system. The knock suppression tests were conducted at 1500 rpm, 12 bar net indicated mean effective pressure wherein the engine was boosted using compressed air. At 60% of blending methane with E10 gasoline, the results show high knock suppression. The net indicated specific fuel consumption is 7% lower, but the volumetric efficiency is 7% lower compared to E10 gasoline only condition. A knock prediction model was calibrated in the 1-D simulation software GT-Power by Gamma Technologies. The calibration was conducted by correlating the simulated engine knock onset with the experimental results. The simulation results show its capability to predict knock onset at various fuel blending ratios.
Źródło:
Journal of KONES; 2018, 25, 3; 517-525
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs
Autorzy:
Rao, D. S.
Hency, V. D. B.
Powiązania:
https://bibliotekanauki.pl/articles/309403.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
802.11ac
CSI
delay
MMSE
throughput
Opis:
The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 4; 17-24
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-enzymatic browning and flavour kinetics of vacuum dried onion slices
Autorzy:
Mitra, J.
Shrivastava, S.L.
Rao, P.S.
Powiązania:
https://bibliotekanauki.pl/articles/24489.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
non-enzymatic browning
flavour kinetics
vacuum drying
onion slice
rehydration ratio
Opis:
Onion slices were dehydrated under vacuum to produce good quality dried ready-to-use onion slices. Colour development due to non-enzymatic browning and flavour loss in terms of thiosulphinate concentration was determined, along with moisture content and rehydration ratio. Kinetics of non-enzyma-tic browning and thiosulphinate loss during drying was analysed. Colour change due to non-enzymatic browning was found to be much lower in the case of vacuum dried onion, and improved flavour retention was observed as compared to hot air dried onion slices. The optical index values for non-enzymatic browning varied from 18.41 to 38.68 for untreated onion slices and from 16.73 to 36.51 for treated slices, whereas thiosulphinate concentration in the case of untreated onion slices was within the range of 2.96-3.92 μmol g-1 for dried sample and 3.71-4.43 μmol g-1 for the treated onion slices. Rehydration ratio was also increased, which may be attributed to a better porous structure attained due to vacuum drying. The treatment applied was found very suitable in controlling non-enzymatic browning and flavour loss during drying, besides increasing rehydration ratio. Hence, high quality dried ready- to-use onion slices were prepared.
Źródło:
International Agrophysics; 2015, 29, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of policies to reduce transportation pollution using system dynamics
Autorzy:
Manohar, G.
Devi, S. P.
Rao, K. S.
Powiązania:
https://bibliotekanauki.pl/articles/208080.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
road transport
road pollutants
road transport emissions
vehicle emissions
transport drogowy
zanieczyszczenia drogowe
emisje motoryzacyjne
emisja komunikacyjna
emisja zanieczyszczeń komunikacyjnych
emisja zanieczyszczeń samochodowych
Opis:
Pollution caused by road transportation is the major factor affecting human health and adversely affecting the global warming. In the study, a system dynamics model has been applied to forecast vehicle emissions from road transport to evaluate policies in the transportation management. The proposed model was applied to evaluate and compare three transportation policy scenarios including road expansion, public transit incentive and enforcement of quality norms for vehicles. The pollution emission data is taken in Chennai, Tamil Nadu. The pollution in the study area will increase substantially if no management plans are implemented. The impact of population increase on transportation pollution has also been considered. It was found that among the proposed policies, implementation of the transit incentive policy to adopt public transports and the implementation of Bharat Stage IV norms for vehicles proved to be efficient in reducing the transport pollution to a great extent.
Źródło:
Environment Protection Engineering; 2014, 40, 4; 143-153
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
Autorzy:
Rao, D. S.
Nayak, B. K.
Acharya, B. C.
Powiązania:
https://bibliotekanauki.pl/articles/2086547.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Nishikhal
manganese ore
lithiophorite
mineral chemistry
Opis:
Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
Źródło:
Mineralogia; 2010, 41, 1/2; 11--21
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of flow pattern on a hydrofoil with structural and profile modification
Autorzy:
Chada, Jithendra Sai Raja
Rao, B. S. V. Rama
Powiązania:
https://bibliotekanauki.pl/articles/2106431.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
hydrofoil
groves
angle of attack
CFD
fine mesh
validation
wodolot
kąt natarcia
walidacja
Opis:
Moving through water takes much more effort than walking through air, and this explains why ships travel much more slowly than automobiles and aircraft. Water is almost 1000 times denser than air, so most of the energy produced by a boat is taken up by dragging (water resistance). Hydrofoils travel much more quickly than ordinary boats, not by pushing through water but by raising the hull (the main body) of the boat upward so it can glide above the waves. Hydrofoil is one of the typical factors that affect the vortex structure and flow characteristics of hydraulic machinery. In order to enhance the utilisation efficiency of hydraulic machinery in marine energy, parallel grooves are proposed and applied to the hydrofoil. Following that, a numerical analysis is performed using the SST k- turbulence model, and the effects of the hydrofoil profile, the angle of attack and the flow are investigated. The profiles of NACA 0066, NACA 8412, NACA M2 and RAE 104 are considered for the study. The performance is analysed based on the lift to drag ratio. The best model from this is given with surface modification and the flow study is carried out at different angles of attack. The modified profile of NACA 8412 with parallel groves has shown the highest lift to drag ratio at a 12 degree angle of attack.
Źródło:
Journal of Mechanical and Energy Engineering; 2022, 6, 1; 27--32
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
Autorzy:
Rao, Danda S.
Nayak, Bijaya K.
Acharya, Bhaskar C.
Powiązania:
https://bibliotekanauki.pl/articles/2086504.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Nishikhal
manganese ore
lithiophorite
mineral chemistry
Opis:
Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
Źródło:
Mineralogia; 2010, 41, 1/2; 11--21
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric Optimization for Producing Semi-Solid A383 Alloy using Cooling Slope Casting Process
Autorzy:
Rao, M. S.
Khandelwal, Himandshu
Kumar, M.
Kumar, A.
Powiązania:
https://bibliotekanauki.pl/articles/27314114.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
alloy A383
semi-solid alloys
casting process
cooling
hardness
non-dendritic microstructur
stop A383
stopy półstałe
proces odlewania
chłodzenie
twardość
mikrostruktura
Opis:
Cooling slope casting is a simple technique to produce semi-solid feedstock with a non-dendritic structure. The cooling slope technique depends on various parameters like slope length, slope angle, pouring temperature etc, that has been investigated in the present study. This work presents an extensive study to comprehend the combined effect of slope angle, slope length, pouring temperature, on hardness and microstructure of A383 alloy. Response Surface Methodology was adopted for design of experiments with varying process parameters i.e. slope angle between 15o to 60o, slope length between 400 to 700 mm, and pouring temperature between 560 oC to 600 oC. The response factor hardness was analysed using ANOVA to understand the effect of input parameters and their interactions. The hardness was found to be increasing with increased slope length and pouring temperature; and decreased with slope angle. The empirical relation for response with parameters were established using the regression analysis and are incorporated in an optimization model. The optimum hardness with non-dendritic structure of A383 alloy was obtained at 27o slope angle, 596.5 mm slope length and 596 oC pouring temperature. The results were successfully verified by confirmation experiment, which shows around 2% deviation from the predicted hardness (87.11 BHN).
Źródło:
Archives of Foundry Engineering; 2023, 23, 1; 43--52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Studies on Distorted Structure Nanomolecules by Using Lie Algebraic Model
Autorzy:
Rao Karumuri, S.
Girija Sravani, K.
Vijayshekar, J.
Reddy, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419693.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Fd
07.57.-c
02.20.Sv
78.30.Na
Opis:
We have applied Lie algebraic model to distorted structure molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The the Lie algebraic model of the Hamiltonian expression is H = $E_0 + \sum_{i = 1}^{n} A_{i} C_{i} + \sum_{i < j}^{n} A_{ij} C_{ij} + \sum_{i < j}^{n} \lambda_{ij} M_{ij}$. By using the Lie algebraic method, the stretching vibrational energies of fullerene $(C_{80})$ are calculated in the one-dimensional [U(2)] framework. Using the model Hamiltonian so constructed, we have calculated the local mode vibrational energy levels of the fullerene $(C_{80})$ accurately.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 49-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 53

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