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Tytuł:
Electron-ion Recombination at Sub-zero Temperature
Autorzy:
Bhattacharyya, S.
Roy, A.
Powiązania:
https://bibliotekanauki.pl/articles/2008325.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.Fw
34.80.Kw
Opis:
In this paper we have considered two-step radiative recombination channel over the existing spontaneous radiative recombination channel to explain the causes of experimentally obtained enhanced recombination rate at sub-zero temperature. The existing recombination rate due to spontaneous radiative recombination is 4 times smaller than the recent experimental data. In the case of Ne$\text{}^{10+}$ we obtain good agreement between theory and experiment when contribution from two-step radiative recombination channel is added to the spontaneous radiative recombination channel. Recombination rate for Ar$\text{}^{18+}$ is calculated. The radiation spectrum given out by two-step radiative recombination and spontaneous radiative recombination in the recombination rate processes are discrete spectrum and continuous spectrum, respectively. Experimental identification of these two channels through the spectral signatures is suggested.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 911-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-Particle Recombination at Low Temperature: a QED Approach
Autorzy:
Bhattacharyya, S.
Roy, A.
Powiązania:
https://bibliotekanauki.pl/articles/2027431.pdf
Data publikacji:
2001-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
33.55.Ad
Opis:
A theoretical study of the three-body recombination of proton and electron in presence of a spectator electron with electronic beam at near-zero temperature is presented using field theory and invariant Lorentz gauge. Contributions from the Feynman diagrams of different orders give an insight into the physics of the phenomena. Recombination rate coefficient is obtained for low lying principal quantum number n=1 to 10. At a fixed ion beam temperature (300 K) recombination rate coefficient is found to increase in general with n, having a flat and a sharp peak at quantum states 3 and 5, respectively. In absence of any other theoretical and experimental results for low temperature formation of H-atom by three-body recombination at low lying quantum states, we have presented the theoretical results of Stevefelt and group for three-body recombination of deuteron with electron along with the present results. Three-body recombination of antihydrogen in antiproton-positron plasma is expected to yield similar result as that for three-body recombination of hydrogen formation in proton-electron plasma. The necessity for experimental investigation of low temperature three-body recombination at low quantum states is stressed.
Źródło:
Acta Physica Polonica A; 2001, 100, 1; 23-40
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactive solute transport in blood flow through a permeable capillary
Autorzy:
Debnath, S.
Roy, A. K.
Bég, O. A.
Powiązania:
https://bibliotekanauki.pl/articles/38695392.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
capillary
axial flow
radial flow
solute dispersion
Gill decomposition
filtration coefficient
exchange coefficient
advection coefficient
Opis:
The present analysis discusses the solute transport process in a steady 2D (axial and radial) laminar flow of blood through a permeable, finite length capillary. Blood is treated as a homogeneous Newtonian fluid and the solute is absorbed at the capillary wall with a linear irreversible reaction rate. The velocity profile is obtained by a regular perturbation technique, whereas the transport coefficients depicted by the Gill generalized dispersion model are solved numerically. A number of different scenarios are considered, namely transport with no-reaction, weak absorption, strong absorption, low filtration or high filtration, etc. In the initial stages, the temporal behaviour of the dispersion coefficient is identical to those cases when there is no radial velocity. For the combined effect of radial and axial velocities, however, the dispersion coefficient is lower for a high absorption rate than for a weak absorption rate. Diffusion is accelerated with higher values of filtration coefficient. Owing to the opposite effects of radial diffusion and radial velocity, the solute particles require more time to reach the steady state. The analysis finds applications in, for example, reactive nutrient and pharmacological transport in capillary hemodynamics.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 173-200
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ejaculation malfunctions on the day of oocyte pick up for IVF/ICSI: A report of four cases
Autorzy:
Javed, A.
Ls, A.
Pathangae, V.G.
Roy, A.
Ganguly, D.
Powiązania:
https://bibliotekanauki.pl/articles/10946.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The procedure of in-vitro fertilization (IVF) is sometime physically stressful and emotional turmoil on the couples undergoing treatment. The male partner is obliged to produce semen for injection/insemination with the oocytes. Unfortunately, some men are ill-fated, not capable to reproduce semen on the day of oocyte pickup.
Źródło:
International Letters of Natural Sciences; 2015, 48
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instrumenty spójności tekstu w dziele „Le livre des fais et bonnes meurs du sage roy Charles V” średniowiecznej francuskiej pisarki Christine de Pizan
Cohesion Instruments of the Text in the Work « Le livre des fais et bonnes meurs du sage roy Charles V » of a Medieval French Writer – Christine de Pizan
Les instruments de la cohésion dans « le Livre des fais et bonnes meurs du sage roy Charles V » de l’écrivaine médiévale Christine de Pizan
Autorzy:
Posturzyńska-Bosko, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/943855.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
cohesion
diaphora
anaphora
cataphora
cohésion
diaphore
anaphore
cataphore
spójność
diafora
anafora
katafora
Opis:
The article is an attempt of verification of the possibility and of its degree of the analysis of the linguistic tools that determine the text cohesion in political works of a medieval French writer Christine de Pizan (XV c). The cohesion relations depend on various linguistic as well as extralinguistic factors and diaphoric metaphors are one of ways to provide the textual cohesion in an economical manner. The concept of the textual economy is the outcome of linguistic and extralinguistic rules. In the world of the text based on a subjective perception, thematic progression is not always logical from the point of view of information orientation even more so because the compilation structure of the political work of Christine de Pizan opens the opportunities for emergence of unexpected cohesion relations.
Cet article est une tentative pour vérifier si la méthodologie moderne de la cohésion textuelle, est pertinente dans le texte de Christine de Pizan où les relations cohésives dépendent de différents facteurs. Puisque les expressions diaphoriques sont un moyen de maintenir et assurer la cohérence du texte d'une façon économique, l'observation de ces facteurs dans le texte médiéval en prose de Christine montre à quel point la diaphore est un phénomène discursif riche et complexe. Le concept d'économie du texte laquelle n'est qu'une moyenne des règles linguistiques et les éléments qui assurent la progression du texte ne constituent qu'un aspect de ce procédé. Dans l'univers textuel, la progression thématique n'est pas toujours «logique» du point de vue de l'orientation informative; il arrive que des constructions, à première vue diaphoriques, qui ne les soient pas dans la saisie globale du texte, parce qu'elles reprennent une information présentée auparavant, sans continuité informationnelle maintenue par d'autres instruments cohésifs. De plus, la structure compilative des œuvres en prose de Christine fait créer «un univers dans l'univers textuel», ouvrant une voie à des liens cohésifs inattendus.
Źródło:
Acta Universitatis Lodziensis. Studia Indogermanica Lodziensia. Supplementary Series; 2015, 4
2451-1153
Pojawia się w:
Acta Universitatis Lodziensis. Studia Indogermanica Lodziensia. Supplementary Series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Edible insects: future of human food – a review
Autorzy:
Pal, P.
Roy, S.
Powiązania:
https://bibliotekanauki.pl/articles/11408.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The practice of eating insects is known as entomophagy. Many animals, such as spiders, lizards and birds, are entomophagous, as are many insects. People throughout the world have been eating insects as a regular part of their diets for millennia. As people in rural areas suffer from under nutrition, especially protein-energy malnutrition (PEM) in Africa, Latin America and Asia, alternative nutritional food sources are needed. From ants to beetle larvae – eaten by tribes in Africa and Australia as part of their subsistence diets – to the popular, crispy-fried locusts and beetles enjoyed in Thailand, it is estimated that insect-eating is practised regularly by at least 2 billion people worldwide. More than 1900 insect species have been documented in literature as edible, most of them in tropical countries. The most commonly eaten insect groups are beetles, caterpillars, bees, wasps, ants, grasshoppers, locusts, crickets, cicadas, leaf and plant hoppers, scale insects and true bugs, termites, dragonflies and flies. The purpose of the present review is to determine the status of present research in the context of the potentiality of insects as alternative food source to cope up with the emerging problem of global food crisis.
Źródło:
International Letters of Natural Sciences; 2014, 21
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new name for Clubiona serrata Dhali, Roy, Saha et Raychaudhuri, 2016 (Araneae: Clubionidae)
Autorzy:
Dhali, Dhruba Chandra
Roy, Tapan Kumar
Saha, Sumana
Raychaudhuri, Dinendra Raychaudhuri
Powiązania:
https://bibliotekanauki.pl/articles/1188104.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sac spider
Clubionidae
Clubiona hexadentata nom.nov.
C. serrata
Opis:
New name Clubiona hexadentata nom. nov. is proposed in place of the sac spider species C. serrata Dhali et al.
Źródło:
World Scientific News; 2016, 56; 263-266
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Journey so far with COVID 19 – a comprehensive review
Autorzy:
Roy, Sayak
Powiązania:
https://bibliotekanauki.pl/articles/2040138.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
clinical trials
respiratory infection
treatment strategies
Opis:
Introduction. The occurrence of the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has emerged as a global pandemic with huge death tolls. Coronavirus disease 2019 (COVID-19) may progress from minimal infection to serious respiratory failure mandating treatment for a continuum of developed disease condition. Aim. The purpose of this review is to summarize the findings related to epidemiology, clinical manifestations, modes of transmission, diagnosis and the treatment modalities (both experimental and repurposed) for COVID-19. Material and methods. Literature were searched using various search engines like PubMed, SCOPUS, EMBASE, J-Gate, Google Scholar to look for review articles, randomized controlled trial results, prospective studies and, retrospective studies done on COVID-19 for the purpose of this comprehensive review. Analysis of the literature. The transmission seems to be occurring through droplet, fomite and aerosols (rarely). Currently there is no specific/targeted vaccine available. Priority is highly placed to identify possible treatment approaches to circumvention this disease. Conclusion. Till we find a vaccine, we have to strategize to optimally use the existing evidence of the indirect effects of these various available drugs for therapy and maintain a strict protocol for prevention and we must use triage system to admit only those critically ill or having severe disease.
Źródło:
European Journal of Clinical and Experimental Medicine; 2020, 4; 303-317
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on hypervector spaces
Autorzy:
Roy, Sanjay
Samanta, Tapas
Powiązania:
https://bibliotekanauki.pl/articles/729023.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hyperoperation
hyperfield
hypervector spaces
linear dependent
linear independent
Opis:
The main aim of this paper is to generalize the concept of vector space by the hyperstructure. We generalize some definitions such as hypersubspaces, linear combination, Hamel basis, linearly dependence and linearly independence. A few important results like deletion theorem, extension theorem, dimension theorem have been established in this hypervector space.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2011, 31, 1; 75-99
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A misinterpretation of Keyness concept of involuntary unemployment
Autorzy:
Grieve, Roy H.
Powiązania:
https://bibliotekanauki.pl/articles/22446546.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
voluntary unemployment
derived demand for labour
involuntary unemployment
Opis:
Research background: One of the principal contributions of Maynard Keynes?s General Theory was identification of the phenomenon of involuntary unemployment, due (on account of adverse expectations and confidence on the part of potential buyers) to a want of demand for the quantity of output which a fully-employed labour force was capable of producing.  Such unemployment, he insisted ? contrary to conventional opinion ? was not due to workers pricing themselves out of work by demanding wages higher than employers could afford.  Far from unemployed workers being themselves responsible for their plight, they were, in reality, victims of circumstances beyond their control. Keynes?s understanding was, for many years, widely accepted by academics, policy-makers and the general public. In recent times, however, mainstream macroeconomic theory has shown a regrettable tendency to return to old modes of thinking. Blame for unemployment is again put on the workforce, whose alleged misunderstanding or slow response to change are said to imply seeking employment on unrealistic terms. A more extreme view is that worklessness may reflect a deliberate choice of leisure. To anyone sceptical of the validity of such analyses there is a clear need to recover the Keynesian understanding of the possibility not just of frictional or voluntary, but also of involuntary unemployment.  Purpose of the article:  Ezra Davar, recognising that it is important not to lose sight of the idea of involuntary unemployment, has recently attempted in this Journal to explain Keynes?s concept. Unfortunately, however, he fails to recognise that Keynes accounted for involuntary unemployment as resulting from deficiency of aggregate demand for output, not as  the consequence of any supply-side factor. In attributing involuntary unemployment to a peculiarity in the labour supply function Davar quite misses Keynes?s point, and in fact identifies as involuntary unemployment a situation of what Keynes would have described as ?voluntary? employment. The objective of the present note is to clear up this misunderstanding.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2018, 13, 2; 331-348
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of Experience (QoE) Assurance by a Multi-path Balanced Traffic-Splitting Algorithm in MPLS Networks
Autorzy:
Krishnadas, Cs
Roy, Rajarshi
Powiązania:
https://bibliotekanauki.pl/articles/764339.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2009, 9, 1
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Study of the Behaviour of a Circular Footing on a Layered Granular Soil Under Vertical and Inclined Loading
Autorzy:
Singh, Surja Pratap
Roy, Amrit Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1838106.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Opis:
This paper aims to study the behaviour of a circular footing resting on two granular layers, i.e., a dense sand layer resting on loose sand strata, subjected to a vertical and an inclined loading (α=0°, 10°, 20°, 30°) using the finite element (FE) software PLAXIS-3D. The Mohr-Coulomb criterion is employed for the analysis of the model, in which two parameters are considered to vary significantly; (1) thickness of the top layer (dense layer) and (2) friction angle (ф) of both the layers. In the circular footing, the bearing capacity on the layered soil profile is assessed using the mechanism of punching shear failure following the desired area approach. The punching shear failure mechanism formed in dense sand has a parabolic shape at the ultimate load when the maximum mobilization of shear force through the failure surface is taken into account, otherwise, the punching failure is the actual failure while punching in the lower layer continues to a greater extent, depending on the interface load. Bearing pressure decreases as the inclination increases with respect to the vertical, along with bearing pressure increasing as the thickness of the dense sand layer increases. The software results compare well with data available from the literature.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 1; 29-43
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study to develop a co-relationship between water quality and land use pattern as index of riverine wetland with statistical approach
Autorzy:
Roy, Malabika Biswas
Kumar, Abhishek
Ghosh, Arnab
Roy, Pankaj Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1050851.pdf
Data publikacji:
2020-03-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
water quality index
wetland dependency
socio-economic evaluation
vegetation index
analysis of variance
Opis:
This investigation additionally recognizes partner cooperation issue and furthermore to moderate the real issue through subjective and quantitative appraisal of riverine wetland. Considering a floodplain wetland in rustic West Bengal, the concentration was extended to perceive the type of wetland capacities as per the idea of individuals’ contribution by group examination. Be that as it may, NDVI was connected to ponder the total weeds condition into the wetland to decide the connection between Water Quality Index (WQI) with Normalized Difference Vegatation Index (NDVI) and its impact on valuation. In ANOVA, which is computed by MINITAB programming, centrality level was lower than 0.05 for each case.
Źródło:
Quaestiones Geographicae; 2020, 39, 1; 33-43
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure and components of agility – a multi-perspective view
Autorzy:
Wendler, Roy
Powiązania:
https://bibliotekanauki.pl/articles/431875.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
agility
agility frameworks
agility concepts
multi-perspective view of agility
Opis:
Agility is a term that is widely used. However, a common understanding of what agility means and what it consists of is missing. Many frameworks have been developed for how to approach agility, but they are very heterogeneous regarding content and structure. This paper approaches the issue by conducting a systematic comparison of 28 available agility frameworks out of the domains of agile manufacturing, agile software development, agile organization, and agile workforce. Altogether, 33 concepts related to agility were identified. The results of the comparison show that, even within the specifically examined domains, a lack of consensus is obvious. In addition, the utilized concepts are very ambiguous and overlapping. As such, the interdependencies between the identified concepts were analyzed in detail. This revealed five recurring “clusters”, each of which combines several concepts with similar content, but despite the amount of available frameworks, none of them reflects these clusters directly. Hence, the study shows that factors beyond the construct of agility are not yet fully uncovered.
Źródło:
Informatyka Ekonomiczna; 2013, 2(28); 148-169
1507-3858
Pojawia się w:
Informatyka Ekonomiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insect natural products as potential source for alternative medicines - A Review
Autorzy:
Roy, Spandita
Saha, Sumana
Pal, Partha
Powiązania:
https://bibliotekanauki.pl/articles/1193952.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Insects
alternative medicine
medicinal drugs
natural products
Opis:
Developments in bioengineering natural products from insects with potential use in modern medicines as well as in utilisation of insects as models for studying essential mammalian processes such as immune responses to pathogens are discussed in this review. The significant recent advances in developing insect derived natural products as potential new medicinal drugs and the use of medicinal plants for the treatment of human diseases has long been practised since the beginning of human civilization. To date, insects have been relatively neglected as sources of modern drugs although they have provided valuable natural products, including honey and silk, for at least 4-7000 years. The use of insect derived products as an alternative medicinal source is an exciting and rapidly expanding new field since insects are hugely variable and have a high biodiversity index. Insects products, such as silk and honey, have already been utilised commercially for thousands of years and extracts of insects used to produce for use in folk medicine around the world, nowadays several other insect products such as venoms which insects use for prey capture and defences, are also used to produce new medicinal drugs which are capable of fighting against a number of diseases like arthritis, inflammation, several cancers, neurological diseases and AIDS too. In the present decade the increasing price of biochemical medicines for the treatment of certain deadly diseases like cancer, AIDS etc is creating a huge economical burden to the common people in the developing countries like India. The search for alternative cost effective and easily available medicines for combating the upcoming diseases is an utmost need in the present decade. The emergence of this kind of alternative medicinal sources like that from the adult insects as well as from their different life history stages or their secretions which are available in plenty in the nature will open up new vistas in the recent researches based on development of medicinal drugs for human diseases.
Źródło:
World Scientific News; 2015, 19; 69-83
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Влияниe Вальтера Скотта на историческую прозу А.С. Пушкина: „Роб Рой” и „Капитанская дочка”
Wpływ Waltera Scotta na prozę historyczną Aleksandra Puszkina: „Rob Roy” i „Córka kapitana”
Walter Scott’s influence on A.S. Pushkin’s historical novel: “Rob Roy” and “The Captain’s Daughter”
Autorzy:
Kizelbach, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/1026593.pdf
Data publikacji:
2018-06-20
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Opis:
This article analyses the influence of Sir Walter Scott’s historical fiction (Rob Roy) on the development of the historical novel in Russia in the first half of the 19th century, based on the example of Pushkin’s The Captain’s Daughter. The author argues that both Scott and Pushkin had a similar approach to their national and local history and collected historical material in the same way (through archival research and by contacting local people who had witnessed the events of the Jacobite Rebellion, 1715, and the Pugachev Rebellion, 1773–1775). A close analysis of both texts presents examples of a similar poetics of the narration, dialectal use of language and dialogue, and the use of local colour and folk elements, such as folk songs or old sayings, which serve as mottos for particular chapters in the novels.
Źródło:
Studia Rossica Posnaniensia; 2016, 41; 105-119
0081-6884
Pojawia się w:
Studia Rossica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on fractional order thermoelastic half space
Autorzy:
Roy, Sourov
Lahiri, Abhijit
Powiązania:
https://bibliotekanauki.pl/articles/1839784.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termosprężystość
źródło ciepła
transformata Laplace'a
thermoelasticity
instantaneous heat source
fractional order
thermoelastic half space
eigen value approach
Opis:
In this paper, we consider a one dimensional problem on a fractional order generalized thermoelasticity in half space subjected to an instantaneous heat source. The Laplace transform as well as eigen value approach techniques are applied to solve the governing equations of motion and heat conduction. Closed form solutions for displacement, temperature and stress are obtained and presented graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 191-202
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco
Autorzy:
Drage, H.B.
Vandenbroucke, T.R.A.
Van Roy, P.
Daley, A.C.
Powiązania:
https://bibliotekanauki.pl/articles/20934.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Euarthropods have a tough exoskeleton that provides crucial protection from predation and parasitism. However, this is restrictive to growth and must be periodically moulted. The moulting sequence is well-known from extant arthropods, consisting of: (i) the long inter-moult stage, in which no changes occur to the hardened exoskeleton; (ii) the pre-moult stage where the old exoskeleton is detached and the new one secreted; (iii) exuviation, when the old exoskeleton is moulted; and (iv) the post-moult stage during which the new exoskeleton starts as soft, thin, and partially compressed and gradually hardens to the robust exoskeleton of the inter-moult stage. Trilobite fossils typically consist of inter-moult carcasses or moulted exuviae, but specimens preserving the post-moult stage are rare. Here we describe nine specimens assigned to Symphysurus ebbestadi representing the first group of contemporaneous fossils collected that preserve all key stages of the moulting process in one taxon, including the post-moult stage. They were collected from a single lens in the Tremadocian part of the Fezouata Shale Formation, Morocco. Based on cephalic displacement and comparison to other trilobite moults, one specimen appears to represent a moulted exoskeleton. Four specimens are typical inter-moult carcasses. Four others are wrinkled and flattened, with thin exoskeletons compared to inter-moult specimens, and are considered post-moult individuals. These S. ebbestadi specimens illuminate the preservation and morphology of the post-moulting stage, characterised by strong anterior-posterior exoskeleton wrinkling, as well as overall body flattening and reduced visibility of thoracic articulations. Being found in the same lens, these specimens likely represent the first preserved in-the-act mass moulting event. The displayed sequence of moulting suggests the moulting process in trilobites was comparable to modern arthropods, and conserved within euarthropod evolutionary history.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Lattice Relaxation in Some Substitutional Alloys Using a Green Function
Autorzy:
Das, S. K.
Datta Roy (Paul), S.
Powiązania:
https://bibliotekanauki.pl/articles/1995663.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Bb
61.82.Bg
Opis:
In this paper we calculate nearest neighbour relaxation in some dilute substitutional alloys using a lattice static Green function and the Morse potential function. Distant neighbour relaxation is calculated by invoking a continuum approximation. The potential parameters for the unlike interactions are calculated using simple interpolation formulae. Using the above relaxation, we calculate volume changes in the above alloys. It is observed that the simple model predicts values which are in reasonably good agreement with the experimental values in all cases. The calculated values are also compared with those obtained from the Vegard law. For Au-Ag alloy, our model reproduces both the correct sign and the magnitude of the volume change, whereas the Vegard law cannot even give the sign of the volume change. This shows the inherent strength of the present model.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 359-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A closed-loop power controller model of series-resonant-inverter-fitted induction heating system
Autorzy:
Pal, P.
Roy, D.
Datta, A.
Sadhu, P. K.
Banerjee, A.
Powiązania:
https://bibliotekanauki.pl/articles/141721.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction heating
power controller
PID
series resonant inverter
MATLAB
Opis:
This paper presents a mathematical model of a power controller for a high-frequency induction heating system based on a modified half-bridge series resonant inverter. The output real power is precise over the heating coil, and this real power is processed as a feedback signal that contends a closed-loop topology with a proportional-integral-derivative controller. This technique enables both control of the closed-loop power and determination of the stability of the high-frequency inverter. Unlike the topologies of existing power controllers, the proposed topology enables direct control of the real power of the high-frequency inverter.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 827-841
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A spinose appendage fragment of a problematic arthropod from the Early Ordovician of Morocco
Autorzy:
Van, Roy P
Tetlie, O.E.
Powiązania:
https://bibliotekanauki.pl/articles/21573.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Early Ordovician
Pseudoangustidontus duplospineus
Arthropoda
arthropod
Ordovician
spinose fragment
Morocco
paleontology
Opis:
A highly spinose fragment of a possibly raptorial appendage from the Arenig (Early Ordovician) of the Upper Fezouata Formation north of Zagora, southeastern Morocco is described as the arthropod Pseudoangustidontus duplospineus gen. et sp. nov. The single fragmentary specimen displays a unique morphology, carrying at least 39 pairs of spines (i.e., 78 spines) of very regularly alternating lengths. Pseudoangustidontus gen. nov. shows some similarities to a number of spinose arthropod appendages and appendage parts, most notably to the spine−bearing podomeres of the third prosomal appendage of megalograptid eurypterids and the problematic and incompletely known genus Angustidontus. However, megalograptids and Angustidontus both have a lower spine count, while the latter also carries only a single row of spines. Because no known arthropod displays a morphology closely comparable to that of Pseudoangustidontus gen. nov., the affinities of the new fossil within Arthropoda remain uncertain.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spiders: A Proficient Candidate in Practising IPM for Darjeeling Tea
Autorzy:
Raychaudhuri, Dinendra
Saha, Sumana
Roy, Tapan Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1193038.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Darjeeling
India
Spider fauna
West Bengal
diversity
tea system
Opis:
Effect of pesticides in the crop fields is now well known. Tea is no exception to this. Idea behind the present study is to appreciate the biological potential of spiders against tea pests. The study area included 6 tea estates viz. Badamtam T.E., Ging T.E., Salim Hill T.E. (organic), Castleton T.E., Namring T.E., and Thurbo T.E. (conventional). Altogether 85 species under 52 genera distributed over 18 families could be recorded. These can broadly be categorized into 7 trophic groups. The decreasing order of the groups are Orb weavers (48.24%) > Ambushers (22.35%) > Ground dwellers (11.76%) ≥ Stalkers (11.76%) > Foliage hunters (9.41%) > Sheet web weavers (2.35%) > Space web builders (1.18%). Out of the total species encountered 4 species are new from the country, 2 from the state and 36 species from the study area. Based on the species richness, the decreasing order of the tea estates are BTE (61.18%) ˃ NTE (54.12%) ˃ GTE (51.76%) ˃ STE (42.35%) ˃ CTE (28.24%) ˃ TTE (25.88%). This leads to infer ‘organic tea system’ exhibits higher spider heterogeneity. Araneids and salticids are the dominant groups. Other than the Oriental representatives, Australian and Palaearctic are the next major groups. Nearly 32.94% of the species are found to be endemic.
Źródło:
World Scientific News; 2016, 38; 1-59
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static Local Field Factor and Ground State Properties of Interacting Electron Gas
Autorzy:
Sarkar, A.
Haldar, S.
Roy, D.
Sen, D.
Powiązania:
https://bibliotekanauki.pl/articles/2038378.pdf
Data publikacji:
2004-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.-w
71.45.Gm
Opis:
In the most general case, the calculation of the static local field factor G(q) for the unpolarised electron gas requires the knowledge of exchange-correlation energy functionals for both the parallel and antiparallel relative spin orientations of the electron gas system. Accurate density interpolation formulae using the quantum Monte Carlo data of Ceperley-Alder for the correlation energy of electron gas in both the "para" and "ferro" states, respectively, in the given density range are used for the calculation of G( q). Fulfilment of relevant consistency criteria is ensured and the local field factor so obtained renders significant improvement of ab initio pseudopotential calculation of effective interaction of Al. The Levin like interpolant of the correlation energy Ceperley-Alder data has been further used to study the ground state properties of the electron gas. It is also noted that a better understanding of the interacting electron gas properties requires a more accurate spin interpolation formula for the correlation energy than the existing ones.
Źródło:
Acta Physica Polonica A; 2004, 106, 4; 497-514
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of a fractional-order enzyme kinetic model
Autorzy:
Al-Basir, F.
Elaiw, A. M.
Kesh, D.
Roy, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/206336.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
enzyme kinetics
cooperative phenomenon
fractional derivative
mathematical modeling
Hamiltonian
optimal control problem
Opis:
Enzymes play a significant role in controlling the characteristics of various chemical and biochemical reactions. They act as catalysts that increase the rate of reaction without undergoing any change in quantity. Enzymatic reactions occur through the active sites, which combine with the substrates to form intermediate complexes, subsequently leading to products. An enzyme having two active sites can show cooperative phenomena. Against this background, an enzyme-kinetic mathematical model is formulated using fractional order derivatives. Optimal control mechanism has been incorporated into the fractional-order model system to maximize the product output. Euler-Lagrange optimality conditions are derived for the FOCP (fractional order control problem) using maximum principle. Numerical iterative schemes have been developed to solve the fractional order optimal control problem through Matlab.
Źródło:
Control and Cybernetics; 2015, 44, 4; 443-461
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Działalność Roy Publishers w Nowym Jorku w latach 1941-1960 jako kontynuacja tradycji przedwojennego Towarzystwa Wydawniczego „Rój”
The activities of Roy Publishers in New York during 1941-1960 – a continuation of the pre-war Publishing Society “Rój” tradition
Autorzy:
Krupa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/947083.pdf
Data publikacji:
2019-12-30
Wydawca:
Uniwersytet Warszawski. Wydział Dziennikarstwa, Informacji i Bibliologii
Tematy:
Towarzystwo Wydawnicze „Rój”
Roy Publishers
polskie oficyny wydawnicze na emigracji
polska literatura międzywojenna
nagrody za przekłady literackie
Marian Kister – Hanna Kister
Publishing House “Rój”
Polish emigre publishing houses
Polish interwar literature
Literary translation awards
Marian Kister
Hanna Kister
Opis:
The article discusses the publishing activities of Roy Publishers in New York from 1940 to the 1960s, particularly its impact on popularizing Polish literature and information about Poland in the U.S. The publishing house continued the tradition of the former house, named “Rój”, which was active during 1924-1940 in Warsaw and established by Melchior Wańkowicz, then managed together with Marian Kister. The article is based on the materials from the publishing house archive, now held at Stanford University Libraries, a valuable research source on the émigré cultural heritage of the 2nd Republic of Poland.
Źródło:
Z Badań nad Książką i Księgozbiorami Historycznymi; 2019, 13; 291-309
1897-0788
2544-8730
Pojawia się w:
Z Badań nad Książką i Księgozbiorami Historycznymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulsatilla patens (Ranunculaceae), a perennial herb, is ectomycorrhizal in northeastern Poland and likely shares ectomycorrhizal fungi with Pinus sylvestris
Autorzy:
Hoeksema, J.
Roy, M.
Laska, G.
Sienkiewicz, A.
Horning, A.
Abbott, M.J.
Tran, C.
Mattox, J.
Powiązania:
https://bibliotekanauki.pl/articles/59306.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
The sharing of species of ectomycorrhizal fungi (EMF) among different co-occurring host plant species could allow the formation of common mycorrhizal networks, which can alter plant–plant interactions and succession. Such sharing of EMF among woody species is thought to be common in many forests, but very few herbaceous plants form EMF, so they are assumed to be excluded from EMF networks in forests. We studied the EMF on roots of a common coniferous tree, Pinus sylvestris, and a co-occurring rare herbaceous perennial plant, Pulsatilla patens (Ranunculaceae), in northeastern Poland. We examined roots from co-occuring P. sylvestris and P. patens, visually classified EMF into morphotypes, studied tissue sections of mycorrhizal structures using compound microscopy, and used DNA sequencing to identify the fungi. On both host plant species, we observed EMF colonization, with colonized root tips exhibiting a swollen appearance, as well as a variety of colors and textures of fungal mycelium covering and emanating from those swollen tips. Sectioning and microscopic examination of an EMF morphotype common on P. patens confirmed the presence of a mantle and Hartig net, indicating the likely presence of functional ectomycorrhizal structures. The two most frequent EMF were Cenococcum geophilum and Piloderma olivaceum, and the latter was found to associate with both host plant species. Several EMF found here only on P. patens, including C. geophilum and two Russula species, are known from previous studies to also associate with P. sylvestris and other tree species. The observation of shared EMF between a coniferous tree and an understory herb indicates the potential for common mycorrhizal networks to alter interactions between these two species and may also indicate a unique way in which the distribution and abundance of a rare herbaceous plant may be influenced by shared mutualisms with a common co-occurring woody plant.
Źródło:
Acta Societatis Botanicorum Poloniae; 2018, 87, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
T-cell proliferation on immunopathogenic mechanism of psoriasis: a control based theoretical approach
Autorzy:
Datta, A.
Roy, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/205612.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
T-cells
dendritic cells
keratinocytes
dermis
epidermis
cytokines
T-cell proliferation
drug efficacy
optimal control
Opis:
Psoriasis vulgaris is a common, worldwide autoimmune skin disorder characterized by T-cells mediated hyperproliferation of keratinocytes. The feature of T-cells arbitrated psoriatic lesions is the epidermal infiltration of oligoclonal CD8+ T-cells and also of CD4+ T-cells in the dermis. Psoriatic scratches are identified by red and enlarged lesions along with silver whitish scales. In this article, we propose a mathematical model for psoriasis, involving a set of differential equations, concerning T-cells, dendritic cells and epidermal keratinocytes. We introduce T-cell proliferation in the system, where T-cells are generated through expansion of accessible CD4+ T-cells from precursors. We are interested in observing how the cell biological system develops through T-cell proliferation in presence of control with respect to T-cells and keratinocytes. We study the model in both implicit and explicit ways and measure the effect of drug on the system through impulsive drug therapy.
Źródło:
Control and Cybernetics; 2013, 42, 2; 365-386
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady MHD mixed convection flow of a micropolar fluid over a vertical wedge
Autorzy:
Roy, N. C.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/264759.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
micropolar fluid
unsteady flow
radiation
heat generation
płyn mikropolarny
przepływ nieustalony
promieniowanie
wytwarzanie ciepła
Opis:
An analysis is presented to investigate the unsteady magnetohydrodynamic (MHD) mixed convection boundary-layer flow of a micropolar fluid over a vertical wedge in the presence of thermal radiation and heat generation or absorption. The free-stream velocity and surface temperature are assumed to be oscillating in magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the finite difference method for the entire frequency range, and the series solution for low frequency range and the asymptotic series expansion method for the high frequency range. Numerical solutions provide a good agreement with the series solutions. The amplitudes of skin friction and couple stress coefficients are found to be strongly dependent on the Richardson number and the vortex viscosity parameter. The Prandtl number, the conduction-radiation parameter, the surface temperature parameter and the pressure gradient parameter significantly affect the amplitudes of skin friction, couple stress and surface heat transfer rates. However, the amplitudes of skin friction coefficient are considerably affected by the magnetic field parameter, whereas the amplitudes of heat transfer rate are appreciably changed with the heat generation or absorption parameter. In addition, results are presented for the transient skin friction, couple stress and heat transfer rate with the variations of the Richardson number, the vortex viscosity parameter, the pressure gradient parameter and the magnetic field parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 363-391
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Medicinal value of animal venom for treatment of Cancer in Humans - A Review
Autorzy:
Pal, Partha
Roy, Spandita
Chattopadhyay, Swagata
Pal, Tapan Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1193921.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cancer
animal venom
anticancer drug
medicinal value
Opis:
Since cancer is one of the leading causes death worldwide and there is an urgent need to find better treatment. In recent years remarkable progress has been made towards the understanding of proposed hallmarks of cancer development and treatment. Anticancer drug developments from natural resources are ventured throughout the world. Venoms of several animal species including snake, scorpion, frog, spider etc. and their active components in the form of peptides, enzymes etc. have shown promising therapeutic potential against cancer. In the present review, the anticancer potential of venoms as well as their biochemical derivatives from some vertebrates like snake or frog or some venomous arthropods like scorpion, honey bee, wasps, beetles, caterpillars, ants, centipedes and spiders has been discussed. Some of these molecules are in the clinical trials and may find their way towards anticancer drug development in the near future. The recognition that cancer is fundamentally a genetic disease has opened enormous opportunities for preventing and treating the disease and most of the molecular biological based treatment are cost effective. The search for alternative economical and natural sources for cancer medicines is of utmost need for the future in combating this dreadful disease that is spreading at fast rate in the present era.
Źródło:
World Scientific News; 2015, 22; 91-107
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Green Function Estimation of Correction to Vegards Law for isovalent Substitutional Defects in Alkali Halide Crystals
Autorzy:
Datta Roy (Paul), S.
Das, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/2013286.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Bb
61.82.Bg
Opis:
A Green function method is developed for estimation of lattice parameter r(χ) of an AX-BX solid solution over entire composition range (χ=0 to 1). The r(χ) obtained in the present method is different from the value r$\text{}_{V}$(χ) suggested by Vegard's law. We estimated the deviation from Vegard's law, r(χ)-r$\text{}_{V}$(χ), over entire composition range for isovalent substitutional defect in alkali halide crystals. When compared to X-ray diffraction measurements, we find that the deviation is in correct direction, variation of r(χ) with χ is consistent with experiment and the overall agreement is fairly good considering the accuracy of the experiment.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 671-679
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Microstrip Filtering Antenna for 4G and 5G Wireless Networks
Autorzy:
Boddu, Ramesh
Deb, Arindam
Roy, Jibendu Sekhar
Powiązania:
https://bibliotekanauki.pl/articles/24200731.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
elliptical microstrip patch antenna
filtering antenna
hairpin bandpass filter
Opis:
The filtering antenna provides both radiation and filtering features and is an important component for the RF front-end of wireless devices. The main function of a filtering antenna is to reject out-of-band signals, thus reducing the interference from adjacent channels. The aim of the present work is to design a 2.6 GHz microstrip filtering antenna for 4G and 5G global mobile services. The filtering antenna is designed using a hairpin bandpass filter integrated with an elliptical microstrip aerial. Good impedance matching is obtained by using appropriate dimensions of the hairpin bandpass filter. The 10 dB return loss bandwidth of the filtering antenna is approx. 5.7%, with the maximum gain for the elliptical filtering antenna of approx. 2.2 dB. Good agreements between the measured and simulated results are obtained for the proposed filtering antenna and the bandwidth covers almost the entire 2.6 GHz band.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 2; 78--83
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Comparison of Optimization Methods for Flat-Top Sector Beamforming in a Cellular Network
Autorzy:
Nandi, Pampa
Roy, Jibendu Sekhar
Powiązania:
https://bibliotekanauki.pl/articles/2142316.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
flat-top sector beam
particle swarm optimization
real-coded genetic algorithm
Opis:
The flat-top radiation pattern is necessary to form an appropriate beam in a sectored cellular network and to pro vide users with best quality services. The flat-top pattern offers sufficient power and allows to minimize spillover of signal to adjacent sectors. The flat-top sector beam pattern is relied upon In sectored cellular networks, in multiple-input multiple-output (MIMO) systems and ensures a nearly constant gain in the desired cellular sector. This paper presents a comparison of such optimization techniques as real-coded genetic algorithm (RGA) and particle swarm optimization (PSO), used in cellular networks in order to achieve optimum flat-top sector patterns. The individual parameters of flat-top sector beams, such as cellular coverage, ripples in the flat-top beam, spillover of radiation to the adjacent sectors and side lobe level (SLL) are investigated through optimization performed for 40◦ and 60◦ sectors. These parameters are used to compare the performance of the optimized RGA and PSO algorithms. Overall, PSO outperforms the RGA algorithm.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 3; 39--46
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conjugate heat and mass transfer on fluctuating mixed convection flow along a vertical wedge with thermal radiation
Autorzy:
Firoza, M. N.
Roy, N. C.
Hossain, A.
Powiązania:
https://bibliotekanauki.pl/articles/264573.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mixed convection
thermal radiation
vertical wedge
promieniowanie cieplne
przepływ ciepła
niska częstotliwość
Opis:
We study the boundary layer characteristics of heat and mass transfer flow past a vertical wedge in the presence of thermal radiation. The surface temperature and the species concentration are assumed to be oscillating in the magnitude but not in the direction of oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the straightforward finite difference method for the entire frequency range, and the series solution for the low frequency range and the asymptotic series expansion method for the high frequency range. Numerical solutions have been presented in terms of the amplitudes and phase angles of the skin friction, the rate of heat transfer and the mass transfer with the variations of Richardson’s number, the Prandtl number, the conduction–radiation parameter, the surface temperature parameter and the Schmidt number. Furthermore, the effects of these parameters are examined in terms of the transient skin friction, heat transfer and mass transfer.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 539-565
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Treatise on the Jumping Spiders (Araneae: Salticidae) of Tea Ecosystem of Dooars, West Bengal, India
Autorzy:
Roy, Tapan Kumar
Saha, Sumana
Raychaudhuri, Dinendra
Powiązania:
https://bibliotekanauki.pl/articles/1182912.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dooars
New taxa
Salticidae
Tea Estates
West Bengal
Opis:
The present study is devoted to 23 salticids under 20 genera recorded from the tea estates of Dooars, West Bengal, India. Of these, Cheliceroides brevipalpis is considered as new to science; Cocalus murinus Simon, 1899 and Phaeacius fimbriatus Simon, 1900 are new from India. The former two genera are the first records from the country. While providing diagnosis of the newly recorded genera, description and necessary illustrations of the new species are also provided. Recorded genera and species are suitably keyed together with relevant illustrations. Lyssomanes sikkimensis Tikader, 1967 is considered as the junior synonym of Telamonia festiva Thorell, 1887.
Źródło:
World Scientific News; 2016, 53, 1; 1-66
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship of vertical jump test with anthropomethric parameters and body composition in university students – a gender variation
Autorzy:
Dalui, Rishna
Singha Roy, Anindita
Kalinski, Michael
Bandyopadhyay, Amit
Powiązania:
https://bibliotekanauki.pl/articles/1055154.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
BMI
LBM
VJT
body fat
skinfold
Opis:
Vertical jump test (VJT) is one of the important determinants of physical fitness. VJT score in school going children of West Bengal, India has been reported. However, pertinent data in young sedentary Indian males and females are unavailable. Moreover, the relationship of VJT with anthropometric parameters and different components of body composition has not yet been explored in Indian context. Debatable findings have been reported regarding the impact of body composition on VJT score. The present study was aimed to evaluate the VJT score in young sedentary Indian university students and its relationship with anthropometric parameters and different components of body composition with special reference to gender variation. Healthy sedentary university students (males n=40 and females n=40) with similar socio-economic background and age group of 21–25 years were randomly sampled for the study from the post-graduate section of the University of Calcutta, Kolkata, India. VJT was evaluated by Sargent Jump Test, and body composition was determined by skinfold measurements. Body height, body mass, %Fat, Total Fat (TF), LBM and VJT score depicted significant (p<0.001) difference between male and female groups. The VJT scores obtained in the male and female groups were in the range of below average and poor, respectively. Physical parameters did not influence the VJT score in both genders. In the present study the VJT score exhibited significant (p<0.001) negative correlation with %fat, individual skinfold, sum of skinfolds, and TF. Hence, body fat content posed as a hindrance to achieve higher jumping height, especially in females, where the lean mass helped to achieve greater VJT score in males.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2014, 5, 1; 83-90
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency stop band in an air-voided ZnO photonic crystal: A dispersion diagram based design
Autorzy:
Chaturvedi, V.
Kumar Roy, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075558.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.65.+g
01.70.+w
41.20.Jb
78.20.-e
Opis:
Electromagnetic excitation, inside small volumes, results in perturbations which play an important role in the validation of theoretical formulations. Efforts to catch a glimpse of the action inside of the small space, can aid better thin film designs. In the non-linear anisotropic regime the results of such interactions provide important insights into the bulk level behavior of matter. Using this approach, a zinc oxide (ZnO) based photonic crystal is designed with spherical air voids. A Gaussian continuous wave excitation of the refractive index contrast (ZnO=1.9 and Air =1) photon waveguide generated thus, is characterized for the redistribution of electromagnetic field. When, centered at a specific wavelength (1.9 μ m), the graph of the frequencies that can exist inside the crystal, is plotted against the limited k-space vector. The dispersion diagram that emerges shows a band of frequency states that cannot exist inside such a design. Physically this constitutes a k-space which is devoid of any detectable disturbances. Crystallographically, the reduced Brilluoin zone can be used to make a thin layer of ZnO that can act as a frequency stop layer, in a real multilayered photoelectric device.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 683-687
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and biochemical properties of selected tropical fruits
Autorzy:
Athmaselvi, K.A.
Jenney, P.
Pavithra, C.
Roy, I.
Powiązania:
https://bibliotekanauki.pl/articles/24720.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
physical property
biochemical property
tropical fruit
fruit
guava
sapota zob.mamey sapote
mamey sapote
papaya
Opis:
This study was conducted to determine the phy- sical and biochemical properties of guava, sapota, and papaya. The physical properties studied were: dimensions, shell ratio, surface area, bulk and true density, porosity, sphericity, packing coeffi- cient, aspect ratio, and roundness index. The specific heat at various mass fractions, biochemical properties like pH, titratable acidity, total soluble solids, and colour analysis were studied for fruit pulps. The viscosity of fruits was studied at various mass fractions. The high sphericity of guava and sapota indicated that those fruits had high rolling capability, which is an important factor for designing hoppers. Bioch emical analysis showed that sapota was the sweetest fruit amongst the three studied.
Źródło:
International Agrophysics; 2014, 28, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental identification of rotating and stationary damping in a cracked rotor system with an offset disc
Autorzy:
Roy, Dipendra K.
Tiwari, Rajiv
Powiązania:
https://bibliotekanauki.pl/articles/140313.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotating (internal) damping
stationary (external) damping
gyroscopic effect
switching crack
unbalance
full-spectrum
Opis:
In the rotor system, depending upon the ratio of rotating (internal) damping and stationary (external) damping, above the critical speed may develop instability regions. The crack adds to the rotating damping due to the rubbing action between two faces of a breathing crack. Therefore, there is a need to estimate the rotating damping and other system parameters based on experimental investigation. This paper deals with a physical model based an experimental identification of the rotating and stationary damping, unbalance, and crack additive stiffness in a cracked rotor system. The model of the breathing crack is considered as of a switching force function, which gives an excitation in multiple harmonics and leads to rotor whirls in the forward and backward directions. According to the rotor system model considered, equations of motion have been derived, and it is converted into the frequency domain for developing the estimation equation. To validate the methodology in an experimental setup, the measured time domain responses are converted into frequency domain and are utilized in the developed identification algorithm to estimate the rotor parameters. The identified parameters through the experimental data are used in the analytical rotor model to generate responses and to compare them with experimental responses.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 4; 447-474
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Analysis of Single Mode Photonic Crystal Fibers with Zero Dispersion and Ultra Low Loss
Autorzy:
Kumar, P.
Tripathy, A.
Roy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/963925.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonic crystal fibers
dispersion
birefringence
splice loss
confinement loss
effective mode area
Opis:
PCFs (Photonic Crystal Fibers) with ‘T’ – shaped core have been proposed in this paper. ‘T’ –shaped core PCF structures have been analyzed using two different background materials: silica and lead silicate. A total of 360° rotation at an interval of 90° has been introduced in the design of PCF structures. PCF structures A, B, C and D with rotation of 0°, 90°, 180° and 270° have silica as wafer. Similarly PCF structures E, F, G and H with similar rotation have lead silicate as background material. Numerical investigations shows structures ‘D’, ‘F’, ‘G’ and ‘H’ to have anomalous dispersion. PCF structures ‘F’, ‘G’, and ‘H’ have reported birefringence of the order of 10⁻². Besides, other PCF structures report birefringence of the order of 10⁻³. Ultra low confinement loss has been observed in all the investigated PCF structures. Moreover, splice loss observed by the structure is very low. Large mode area has been shown by all the designed PCF structures.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 4; 541-546
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutions of Metamimesis – Between Theoretical Category and Method of Artistic Practice
Ewolucje Metamimesis – pomiędzy kategorią teoretyczną a praktyką artystyczną
Autorzy:
Kawalec, Anna
Powiązania:
https://bibliotekanauki.pl/articles/577876.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metamimesis
self-awareness
theory/practice
artistic/philosophical
Xavier le Roy
samoświadomość
teoria/praktyka
artystyczne/filozoficzne
Opis:
Metamimesis, etymologically, is a combination of the Greek prefi x “meta” and mimeisthai, which was in use prior to the emergence of the Platonic tradition (Koller 1954). In the following work I argue that the methodological and technical aspect of classical category, mimesis, has been changing during the development of art and human thinking throughout the cultural history and philosophy.2 This work discusses hypotheses concerning functional and interdisciplinary, and potentiality of meaning of the category of metamimesis, especially: contemplative meaning (as the classical-philosophical) and – the original – performative meaning (according to A. Artaud: as a non-discursive and non-mendacious reality). The main part of the paper applies the category of metamimesis to interpret selected artistic practices, in particular the artistic performance of Iron Ship and Xavier le Roy’s Low pieces. Thus, it discloses the vast potentiality of the act of performance as a process involving contemplative and performative dimensions of human being – all participants of this process. The discussion concerns also the question about the limits of human thinking and ultimately the possible existence of a transcendental awareness. The article is an introduction to the study of potentiality of the category “metamimesis”.
Termin metamimesis jest złożeniem greckiego prefi ksu „meta” oraz „mimeisthai”, używanego jeszcze przed Platonem (Koller 1954). W prezentowanym artykule twierdzę, że aspekty metodologiczny i techniczny klasycznej kategorii mimesis zmieniały się wraz z rozwojem sztuki i ludzkiej myśli. W artykule rozważam potencjalność znaczenia kategorii metamimesis, szczególnie w kontekście fi lozofi i klasycznej jako pojęcie kontemplacji, a także – źródłowo – w kontekście znaczeń performatywnych (według A. Artauda, jako niedyskursywne i niezakłamane praktyki). Główna część tekstu poświęcona jest zastosowaniu „metamimesis” do interpretacji praktyk artystycznych, na przykładzie performansów Iron Ship oraz Low pieces (stąd sugeruję także użyteczność tytułowego pojęcia dla umotywowania kształtu młodej dyscypliny „Performance Philosophy”). Finalnie wnioskuję, iż działanie performatywne jest procesem rozwijającym wymiary bycia, takie jak kontemplatywny i performatywny, wszystkich uczestników tego typu praktyk. „Metamimesis” jest też, jak się okaże, kategorią skupiającą (jak w soczewce) pytania dotyczące granic ludzkiego myślenia, a pociąga za sobą pytania o możliwość istnienia świadomości transcendentnej. Artykuł ma charakter wprowadzenia do badań nad potencjalnością tytułowej kategorii.
Źródło:
Zagadnienia Naukoznawstwa; 2017, 53, 2(212); 261-278
0044-1619
Pojawia się w:
Zagadnienia Naukoznawstwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady laminar mixed convection boundary layer flow near a vertical wedge due to oscillations in the free-stream and surface temperature
Autorzy:
Roy, N. C.
Hossain, A.
Hussain, S.
Powiązania:
https://bibliotekanauki.pl/articles/264762.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
granica przepływu warstwy
przepływ ciepła
mixed convection
boundary layer flow
vertical wedge
free-stream oscillation
Opis:
The unsteady laminar boundary layer characteristics of mixed convection flow past a vertical wedge have been investigated numerically. The free-stream velocity and surface temperature are assumed to be oscillating in the magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the straightforward finite difference method for the entire frequency range, and the extended series solution for low frequency range and the asymptotic series expansion method for high frequency range. The results demonstrate the effects of the Richardson number, Ri, introduced to quantify the influence of mixed convection and the Prandtl number, Pr, on the amplitudes and phase angles of the skin friction and heat transfer. In addition, the effects of these parameters are examined in terms of the transient skin friction and heat transfer.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 169-186
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ethnography, Translation of Cultures and History in V. S. Naipaul’s India Trilogy, „The Loss of El Dorado” and „A Way in the World”
Autorzy:
Roy, Satarupa Sinha
Powiązania:
https://bibliotekanauki.pl/articles/653541.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
V. S. Naipaul
travel writing
ethnography
history
translation of cultures
Opis:
The genre of travel writing is not only informed by an interdisciplinary aesthetic but also involves the description of peoples and the translation/re-presentation/re-interpretation of cultures. This article provides important clues as to how ethnography can be made to function as a legitimate mode of cultural and literary criticism. In doing so, this article seeks to establish that just as the ethnographer’s systematic study of the Other entails the possibility of gaining knowledge about the self, the travel writer’s knowledge of the Other, too, can often lead to a veritable gain in consciousness. Representation of the past or of history so to speak, as well as of the present which springs from that history, form a major preoccupation in Naipaul’s travel writing. To construct the present which, as a temporal category, is fairly problematic insofar as it is ephemeral and ever-fleeting and cannot be described without referring to what was or has been, one must begin with what one believes to be an understanding of the past – of history, per se. This study demonstrates how intensely emotional encounters with pastness inform the ways in which history is developed and narrativized within the discursive field of travel writing.
Źródło:
Analyses/Rereadings/Theories: A Journal Devoted to Literature, Film and Theatre; 2018, 5, 1; 32-42
2353-6098
Pojawia się w:
Analyses/Rereadings/Theories: A Journal Devoted to Literature, Film and Theatre
Dostawca treści:
Biblioteka Nauki
Artykuł
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