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Wyświetlanie 1-15 z 133
Tytuł:
A hitherto unknown river type from the Archaean at Bhurkuli (Jharkhand, E India)
Autorzy:
van Loon, A. J.
De, S.
Powiązania:
https://bibliotekanauki.pl/articles/94253.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
conglomerates
fluvial system
pebble characteristics
Precambrian
Singhbhum Craton
zlepieńce
system fluwialny
charakterystyka żwirkowa
prekambr
Opis:
The Archaean granitoid pluton of the Singhbhum craton in E India is overlain by Archaean to Palaeoproterozoic metasediments. These sediments are still poorly known and their stratigraphy is under debate. Several scattered, most probably Meso- to Neoarchaean, conglomerates are present in the state of Jharkhand that differ so much in characteristics that they are probably not related to each other. The sedimentology of a series of conglomerate patches and layers near Bhurkuli has been investigated, including the characteristics of the clasts. It is deduced on the basis of these characteristics and the sedimentological context that the Bhurkuli conglomerates represent the channel facies of a river system that differed from the types of fluvial systems that exist nowadays.
Źródło:
Geologos; 2017, 23, 2; 109-122
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water wave scattering by an infinite step in the presence of an ice-cover
Autorzy:
Ray, S.
De, S.
Mandal, B. N.
Powiązania:
https://bibliotekanauki.pl/articles/265982.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fala wodna
pokrywa lodowa
aproksymacja Galerkina
water wave scattering
ice cover
infinite step
integral equation
Galerkin approximation
reflection and transmission coefficients
Opis:
The classical problem of water wave scattering by an infinite step in deep water with a free surface is extended here with an ice-cover modelled as a thin uniform elastic plate. The step exists between regions of finie and infinite depths and waves are incident either from the infinite or from the finite depth water region. Each problem is reduced to an integral equation involving the horizontal component of velocity across the cut above the step. The integral equation is solved numerically using the Galerkin approximation in terms of simple polynomial multiplied by an appropriate weight function whose form is dictated by the behaviour of the fluid velocity near the edge of the step. The reflection and transmission coefficients are obtained approximately and their numerical estimates are seen to satisfy the energy identity. These are also depicted graphically against thenon-dimensional frequency parameter for various ice-cover parameters in a number of figures. In the absencje of ice-cover, the results for the free surface are recovered.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 157-168
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-simple elastic materials with double porosity structure
Autorzy:
De Cicco, S.
Powiązania:
https://bibliotekanauki.pl/articles/38695685.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
strain-gradient theory
porous solids
chiral materials
torsion of a circular cylinder
Opis:
This paper is concerned with a strain gradient theory of elastic materials that have a double porosity structure. Firstly, we present the basic equations and the boundary conditions of the nonlinear theory. Then, we derive the equations of the linear theory and present the constitutive equations for chiral materials. The theory is applied to study the deformation of a chiral cylinder. The materials with a double porosity are of interest in geophysics and in mechanics of bone.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 127-142
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards the development of a topological model to assess networks performance : connectivity, robustness and reliability
Autorzy:
Eid, M.
Cursi-Eduardo-de, S.
EL Hami, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069415.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
robustness
connectivity
reliability
failure
critical states
Opis:
Networks are the widest spreading system which Mankind has ever developed, today. New needs, services, and use are created each day where network systems represent the most critical aspect. Additionally, the interconnection between networks of different types is growing as never. This acceleration of interconnection of all sorts brings to the front scene the issue of performance measure in networks design and operation. For that purpose, engineers are orienting their major efforts towards the development of methods, models and codes to assess and measure networks performance in terms of probability of being connected. From this stand point of view, the engineers’ attention is mainly focused on defining the network “Connectivity” and measuring it, in different manner, using probabilities. Subsequently, we are observing an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, since the sixties. Modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room has been lift to exploring the potential of graphical and topological models to develop qualitative and semi- quantitative models in order to assess networks performance. In this paper, we have tried to explore the potential of the topological modelling and are proposing an original one. The proposed model is still in its earliest phase of development. But, it sounds very promoting at that stage of maturation. According to this model, the term “performance” may be extended, beyond the “connectivity probabilistic concept”, to “robustness” and to a “deepest insight” of the “connectivity concept” itself. The impact is immediate on the way the “reliability concept” would be extended to cover network systems.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 21--38
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loads on walls and inserts in a mass-flow silos
Autorzy:
Ding, S.
Wójcik, M.
Jecmenica, M.
Silva de, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/1955779.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
silo flow/loads
insert
Lagrangian-Eulerian
adaptive
fillet
Opis:
A finite element analysis has been carried out to investigate flow patterns and loads on silos either with a ralatively steep hopper, or with a shallow hopper but in the presence of an insert. A Lagrangian-Eulerian approach was first adopted to simulate the material flow pattern, with the precondition that mass flow was obtained. It was then attempted to predict the loads exerted by granular materials on the walls of such silos. The load on the insert was also simulated. Techniques such as the adoption of adaptive meshes and filleting along sharp corners were applied in the analysis to overcome the difficulties usually encountered with large deformations in the FEM and the mathematic singularity presented by the abruptness of geometry. Filleting proved to be necessary to bring down the pressure peak at the transition level. The insert took over a significant part of the loads. Comparison with the classic theories have confirmed that the loads predicted on the wall agree quite well with the theoretical results in the silo's cylinder section, but that differences exist in the hopper section; the difference is greater when the hopper is shallower. It has also shown the limitations of predicting flow patterns of granular materials with the traditional elastic-plastic model; a more advanced model is needed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 525-538
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From exhaustive vacation queues to preemptive priority queues with general interarrival times
Autorzy:
Fiems, D.
De Vuyst, S.
Powiązania:
https://bibliotekanauki.pl/articles/330948.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
queueing system
preemptive priority
server interruption
server breakdown
exhaustive vacations
system kolejkowy
zawieszenie serwera
awaria serwera
Opis:
We consider the discrete-time G/GI/1 queueing system with multiple exhaustive vacations. By a transform approach, we obtain an expression for the probability generating function of the waiting time of customers in such a system. We then show that the results can be used to assess the performance of G/GI/1 queueing systems with server breakdowns as well as that of the low-priority queue of a preemptive MX+G/GI/1 priority queueing system. By calculating service completion times of low-priority customers, various preemptive breakdown/priority disciplines can be studied, including preemptive resume and preemptive repeat, as well as their combinations. We illustrate our approach with some numerical examples.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 4; 695-704
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the growth of averaged Weyl sums for rigid rotations
Autorzy:
de Bièvre, S.
Forni, G.
Powiązania:
https://bibliotekanauki.pl/articles/1218217.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Let ω ∈ ℝ╲ℚ and $f ∈ L^2(^1)$ of zero average. We study the asymptotic behaviour of the Weyl sums $S(m,ω)f(x) = ∑^{m-1}_{k=0} f(x + kω)$ and their averages $Ŝ(m,ω)f(x) = {1/m}∑^m_{j=1} S(j,ω)f(x)$, in the $L^2$-norm. In particular, for a suitable class of Liouville rotation numbers ω ∈ ℝ╲ℚ, we are able to construct examples of functions $f ∈ H^{s}^{1}$, s > 0, such that, for all ε > 0, ||Ŝ(m,ω)f||_2 ≥ C_{ε}m^{1/(1+s)-ε}$ as m → ∞. We show in addition that, for all $f ∈ H^{s}^{1}$, $lim inf m^{-1/(1+s)} (log m)^{-1/2} ||Ŝ(m,ω)f||_2 < ∞$ for all ω ∈ ℝ╲ℚ.
Źródło:
Studia Mathematica; 1998, 130, 3; 199-212
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossil amiids (Pisces) of China and their biostratigraphic significance
Autorzy:
Hsien-t'ing, L.
De-zao, S.
Powiązania:
https://bibliotekanauki.pl/articles/23315.pdf
Data publikacji:
1983
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
This paper reviews the Sinamiidae. The supplementary descriptions of Sinamia huananensis and Ikechaoamia orientalis are made. The specific characters of these two genera have been emended. On the basis of this, the geological and geographical distributions of Sinamia and Ikechaoamia are discussed. The sinamiids yielded from the Lpcoptera-bearing beds in North China are S. zdanskyi and I. orientalis, and from the Mesoclupea-bearing beds in Southeast China are S. huananensis and I. meridionalis. Based on the characters of the fish faunas stated above, the formations containing these two fish faunas in North and Southeast China should be Upper Jurassic and can be correlated generally.
Źródło:
Acta Palaeontologica Polonica; 1983, 28, 1-2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of extremes in air temperature over north-east and west coast regions of India
Autorzy:
Tondgimenba, J.
De, U.S.
Krishnakumar, G.
Powiązania:
https://bibliotekanauki.pl/articles/11981.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
assessment
extreme
air temperature
maximum temperature
minimum temperature
trend
climate change
coastal region
India
Opis:
The projected effect of climate change is the increase of both the frequency and intensity of extreme weather events. An attempt has been made to study the extremes in temperature over two regions of India i.e. North-East Region (NER) and West Coast Region (WCR). A detailed analysis indicated that in the NER, ten stations indicate increase in annual extreme minimum but significant at four stations. Post-monsoon season is very predominant where five stations show significant increase. In the WCR, all the stations indicate increasing trend in annual extreme maximum temperature significant at nine stations. Majority of the stations indicate significant increasing trend in all the seasons except monsoon season.
Źródło:
Papers on Global Change; 2012, 19
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scrutinizing Barremian coprolite inclusions to record digestive strategies
Autorzy:
Barrios-de Pedro, S.
Buscalioni, Á. D.
Powiązania:
https://bibliotekanauki.pl/articles/191206.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Cretaceous
Las Hoyas
lacustrine
taphonomy
digestive process
feeding ecology
Opis:
The exceptional preservation of the Las Hoyas coprolites allows the taphonomic study of inclusions on twelve morphotypes and twenty-three specimens. Non-destructive techniques were applied to study the digestion features (pitting, corrosion lines, shape of the fractures at the ends) and the arrangement, number, and size of inelusions. An analysis based on non-metric, multidimensional scaling ordination identified the similarities among the inclusion features and morphotypes. The morphotypes are clustered on the basis of the way of ingestion and the digestive process. The authors recognize three digestive strategies for the Las Hoyas coprolites: (1) ingestion of prey with limited processing in the mouth, scarce to less effective acid secretions, and/or defecation in a short period of time; (2) ingestion of the prey with mastication prior to deglutition, and defecation over a longer period of time; (3) mastication and long retention time of food in the digestive system with more effective acid secretions. This study is a first step in the understanding of the feeding ecology of the Las Hoyas Barremian lentic ecosystem, based on coprolites.
Źródło:
Annales Societatis Geologorum Poloniae; 2018, 88, 2; 203-221
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new species of primitive Reticulophragmium (Foraminifera) from the Paleocene Vidono Formation of northeastern Venezuela
Nowy gatunek o prymitywnych cechach rodzaju Reticulophragmium (Foraminifera) z paleoceńskiej Formacji Vidono (północno-wschodnia Wenezuela)
Autorzy:
Kaminski, M. A.
Crespo de Cabrera, S.
Powiązania:
https://bibliotekanauki.pl/articles/191232.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Geologiczne
Opis:
The new species Reticulophragmium vidonioensis Kaminski & Crespo de Cabrera is newly described from the subsurface Vidono Formation of northeastern Venezuela. The foraminiferal assemblage is dated as Zone P3 (mid Paleocene), and represents an outer neritic-upper bathyal biofacies. Reticulophragmium vidonioensis n.sp. displays very primitive morphological features, and illustrates the close evolutionary relationship between the earliest Paleocene alveolar genus Reticulophragmium and the non-alveolar genus Haplophragmoides.
Z osadów srodkowego paleocenu (zona P3) formacji Vidono w północno-wschodniej Wenezueli opisano nowy gatunek Reticulophragmium vidonioensis Kaminski & Crespo de Cabrera, należący do grupy otwornic aglutynujących. Zespół otwornic z nowo opisanym taksonem reprezentuje biofacje z pogranicza strefy nerytycznej i górnego batiału. Gatunek Reticulophragmium vidonioensis n.sp. charakteryzują cechy stawiające go jako forme posrednią pomiedzy rodzajem Reticulophragmium o alweolarnej strukturze i rodzajem Haplophragmoides nie wykazującym w budowie wewnetrznej skorupki struktury alweolarnej.
Źródło:
Annales Societatis Geologorum Poloniae; 1999, 69, No. 3-4; 189-193
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Infrastructures Protection (CIP) : contribution to EU research on resilience & preparedness
Autorzy:
Eid, M.
Serafin, D.
Barbarin, Y.
Estel, L.
Cursi-Eduardo-de, S.
Hami-EL, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069492.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
CIP
resilience
robustness
failure
preparedness
cascading effect
Opis:
Critical Infrastructure (CI) Preparedness and Resilience modelling, simulation & analysis (MS&A) receive a strong interest from systems safety and risk management engineering and research communities. This technical and scientific interest responds to the rapid growth of the use of the smart technology in the modern society activities. The concept of resilience in CIP is not yet clearly defined. However, a probabilistic model is proposed describing the robustness and the resilience of a well-defined infrastructure facing a given threat.
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 1; 47--56
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of a R&D frame to develop resilience models for services supply continuity in view of crisis situations
Autorzy:
Eid, M.
Elhami, A.
Sousa De Cursi, S.
Powiązania:
https://bibliotekanauki.pl/articles/2068753.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
resilience
modelling
critical
infrastructure
crisis
management
Opis:
The authors propose a frame to develop mathematical models describing the resilience of the service(s) supply processes and the associated critical-infrastructure(s), in crisis situation. The paper is intended to contribute in developing the paradigm of resilience and appropriate metrics. It describes briefly the paradigm of resilience used in some scientific disciplines, especially: the physical-mechanical resilience (material sciences), the ecological resilience and the psychological resilience. Presently, the use of resilience is very loos, especially, in analysing vital service supply continuity and in crisis management, as far as we are concerned. An advanced resilience concept should encompass: temporality, stochasticity and measurability. The authors propose an R&D frame to develop such formal models in order to help in resilience analysis and decision making for crisis management. Formal models are necessary to rationalise analyses, normalise best practices and build decision making processes. The proposed R&D frame integrates: vulnerability and dependency/interdependency.
Źródło:
Journal of Polish Safety and Reliability Association; 2018, 9, 3; 11--20
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the temporal stability of spatial patterns of soil apparent electrical conductivity using geophysical methods
Autorzy:
De Caires, S.A.
Wuddivira, M.N.
Bekele, I.
Powiązania:
https://bibliotekanauki.pl/articles/26396.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
temporal stability
spatial pattern
soil
plantation
cocoa
Theobroma cacao
soil property
electrical conductivity
electromagnetic induction
geophysical method
Opis:
Cocoa remains in the same field for decades, resulting in plantations dominated with aging trees growing on variable and depleted soils. We determined the spatio-temporal variability of key soil properties in a (5.81 ha) field from the International Cocoa Genebank, Trinidad using geophysical methods. Multi-year (2008-2009) measurements of apparent electrical conductivity at 0-0.75 m (shallow) and 0.75-1.5 m (deep) were conducted. Apparent electrical conductivity at deep and shallow gave the strongest linear correlation with clay-silt content (R = 0.67 and R = 0.78, respectively) and soil solution electrical conductivity (R = 0.76 and R = 0.60, respectively). Spearman rank correlation coefficients ranged between 0.89-0.97 and 0.81-0.95 for apparent electrical conductivity at deep and shallow, respectively, signifying a strong linear dependence between measurement days. Thus, in the humid tropics, cocoa fields with thick organic litter layer and relatively dense understory cover, experience minimal fluctuations in transient properties of soil water and temperature at the topsoil resulting in similarly stable apparent electrical conductivity at shallow and deep. Therefore, apparent electrical conductivity at shallow, which covers the depth where cocoa feeder roots concentrate, can be used as a fertility indicator and to develop soil zones for efficient application of inputs and management of cocoa fields.
Źródło:
International Agrophysics; 2014, 28, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault-tolerant control strategy for actuator faults using LPV techniques: application to a two degree of freedom helicopter
Autorzy:
Montes de Oca, S.
Puig, V.
Witczak, M.
Dziekan, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/331468.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie tolerujące uszkodzenia
układ liniowy niestacjonarny
liniowa nierówność macierzowa
fault tolerant control
linear parameter varying
virtual actuator
linear matrix inequality
Opis:
In this paper, a Fault Tolerant Control (FTC) strategy for Linear Parameter Varying (LPV) systems that can be used in the case of actuator faults is proposed. The idea of this FTC method is to adapt the faulty plant instead of adapting the controller to the faulty plant. This approach can be seen as a kind of virtual actuator. An integrated FTC design procedure for the fault identification and fault-tolerant control schemes using LPV techniques is provided as well. Fault identification is based on the use of an Unknown Input Observer (UIO). The FTC controller is implemented as a state feedback controller and designed using polytopic LPV techniques and Linear Matrix Inequality (LMI) regions in such a way as to guarantee the closed-loop behavior in terms of several LMI constraints. To assess the performance of the proposed approach, a two degree of freedom helicopter is used.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 161-171
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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