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Journal articles on the topic 'Successioni numeriche'

Author: Grafiati

Published: 26 July 2024

Last updated: 27 July 2024

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1

Winkler, Dániel. "Ecological Succession of Breeding Bird Communities in Deciduous and Coniferous Forests in the Sopron Mountains, Hungary." Acta Silvatica et Lignaria Hungarica 1, no. 1 (2005): 49–58. http://dx.doi.org/10.37045/aslh-2005-0004.

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The relationship between breeding bird communities and different phases of secondary succession of deciduous (sessile oak – Quercus petraea) and coniferous (spruce – Picea abies) forests in the Sopron Mountains was studied. The bird censi have been carried out in 5 different successional stages using the “double-visit fixed-radius point count technique”. A total of 38 bird species were encountered. There are typical bird communities to order to different stages of forest succession, containing unique bird species or species appearing predominantly in that successional stage. The study has show

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2

Monga, Priyanka, Madhav Kumar, Vandana Prasad, and Yogesh Joshi. "Palynostratigraphy, palynofacies and depositional environment of a lignite-bearing succession at Surkha Mine, Cambay Basin, north-western India." Acta Palaeobotanica 55, no. 2 (2015): 183–207. http://dx.doi.org/10.1515/acpa-2015-0010.

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Abstract The paper reports palynology and palynofacies studies of lignite-bearing sediments exposed in an opencast mine succession at Surkha, Bhavnagar District, in the coastal region of Gujarat, India. The study examined the relationships between the palynoflora, sedimentary organic matter and environment at the time of deposition of lignite and associated sediments. Based on dinoflagellate cyst biostratigraphy, the sedimentary succession is dated as early Eocene (Ypresian). Palynofacies studies helped reveal the palaeoenvironmental fluctuations. The dominance of angiosperm pollen grains, fre

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3

Ma, Wei, Shen Lei, Yujun Sun, and Jason Grabosky. "Forest succession in post-agricultural Larix olgensis plantations in northeast China." Journal of Forestry Research 31, no. 6 (2019): 2495–505. http://dx.doi.org/10.1007/s11676-019-00960-7.

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Abstract In order to understand the management of regional vegetation, numerical classification and ordination are widely used to investigate community distribution and vegetation features. In particular, two-way indicator-species analysis programs (TWINSPAN) classifies plots and species into different groups. De-trended correspondence analysis (DCA) and canonical correspondence analysis (CCA) reflects the relationship between community and site conditions. Afforestation with Larix olgensis Herry. Plantations is a suitable restoration strategy on post-agricultural fields in the Lesser Khingan

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4

Salugin, A. N. "NUMERICAL MODELING OF SUCCESSIONAL TRANSITIONS IN AGROECOLOGY." Rossiiskaia selskokhoziaistvennaia nauka, no. 1 (2020): 62–65. http://dx.doi.org/10.31857/s2500-2627-2020-1-62-65.

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5

Salugin, A. N. "Numerical Modeling of Successional Transitions in Agroecology." Russian Agricultural Sciences 46, no. 2 (2020): 187–91. http://dx.doi.org/10.3103/s1068367420020172.

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6

Fischer, Martin H., and Richard A. Mills. "A spatial perspective on numerical concepts." Behavioral and Brain Sciences 31, no. 6 (2008): 651–52. http://dx.doi.org/10.1017/s0140525x08005670.

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AbstractThe reliable covariation between numerosity and spatial extent is considered as a strong constraint for inferring the successor principle in numerical cognition. We suggest that children can derive a general number concept from the (experientially) infinite succession of spatial positions during object manipulation.

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7

Chang, Li, Yuanqing He, Taibao Yang, Jiankuo Du, Hewen Niu, and Tao Pu. "Analysis of Herbaceous Plant Succession and Dispersal Mechanisms in Deglaciated Terrain on Mt. Yulong, China." Scientific World Journal 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/154539.

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Ecological succession itself could be a theoretical reference for ecosystem restoration and reconstruction. Glacier forelands are ideal places for investigating plant succession because there are representative ecological succession records at long temporal scales. Based on field observations and experimental data on the foreland of Baishui number 1 Glacier on Mt. Yulong, the succession and dispersal mechanisms of dominant plant species were examined by using numerical classification and ordination methods. Fifty samples were first classified into nine community types and then into three succe

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8

Catelli, Marika, Angelica Di Domenico, Carlo Mina, and Monica Treppiedi. "Alla scoperta dei numeri che ci circondano." Didattica della matematica. Dalla ricerca alle pratiche d’aula, no. 11 (May 18, 2022): 69–94. http://dx.doi.org/10.33683/ddm.22.11.4.

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L’articolo presenta dei percorsi didattici finalizzati all’apprendimento numerico in prima elementare, attraverso la ricerca e la conoscenza dei numeri con cui i bambini si confrontano nella quotidianità. I percorsi sono incentrati su attività di scoperta, di stampo laboratoriale e ludico, che hanno la finalità di promuovere le competenze numeriche di base, fondamentali per questo anno scolastico, proponendo anche sviluppi per ampliare e consolidare tali apprendimenti anche negli anni scolastici successivi. Per ogni percorso, vengono presentati alcuni possibili legami con i materiali creati al

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9

CHERRUAULT, Y. "Some numerical methods for resolution of non-linear integral equations." MAUSAM 36, no. 3 (2022): 319–22. http://dx.doi.org/10.54302/mausam.v36i3.1924.

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We suggest several methods which bring back the resolution of non-linear integral equations to a succession of linear integral equations or to a linear algebraic system. All these methods have been tested numerically.

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10

Blajer, W. "Aircraft program motion along a predetermined trajectory Part II. Numerical simulation with application of spline functions to trajectory definitions." Aeronautical Journal 94, no. 932 (1990): 53–58. http://dx.doi.org/10.1017/s0001924000022430.

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Aspects of numerical simulation of aircraft program flight along a predetermined trajectory are presented. An emphasis is laid on the problem of describing the required trajectory by means of a succession of defined points. A spline function method is used for interpolation and smoothing routines. Some numerical illustrations of aircraft trajectory flight simulation (only planar motion) are demonstrated and discussed.

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11

Yu, Andy, G. T. Lumpkin, Ritch L. Sorenson, and Keith H. Brigham. "The Landscape of Family Business Outcomes." Family Business Review 25, no. 1 (2011): 33–57. http://dx.doi.org/10.1177/0894486511430329.

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To promote theoretical development in family business research, this research identified 327 dependent/outcome variables used in 257 empirical family business studies in 1998-2009. In four studies, the authors categorized outcome variables, developed a numerical taxonomy with seven clusters (performance, strategy, social and economic impact, governance, succession, family business roles, and family dynamics) plotted along two dimensions (business–family and short-term–long-term), validated their research, and identified missing outcome variables and variables that deserve more attention. Exper

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12

Torres Montes de Oca, Carlos Alberto, José Eduardo Rosas Valencia, and Oswaldo Aldair Pérez Jarquín. "Numerical-vector succession for the graphic structural analysis of masonry historic buildings with arches and symmetrical systems." Revista ALCONPAT 14, no. 2 (2024): 191–210. http://dx.doi.org/10.21041/ra.v14i2.717.

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Many historic buildings have symmetry in their geometric configuration. The objective of this research is to denote the application of numerical-vector succession in the structural analysis of historical masonry buildings, with arches and symmetrical systems, including mathematical processes in ancient graphic analysis, emphasizing the importance of loads in the structural stability. We based the analysis on three fundamental stages: recognition of the construction system of the heritage object, geometric discretization of the system and vector analysis under different physical considerations.

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Ding, Xuesong, Tristan Salles, Nicolas Flament, and Patrice Rey. "Quantitative stratigraphic analysis in a source-to-sink numerical framework." Geoscientific Model Development 12, no. 6 (2019): 2571–85. http://dx.doi.org/10.5194/gmd-12-2571-2019.

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Abstract. The sedimentary architecture at continental margins reflects the interplay between the rate of change of accommodation creation (δA) and the rate of change of sediment supply (δS). Stratigraphic interpretation increasingly focuses on understanding the link between deposition patterns and changes in δA∕δS, with an attempt to reconstruct the contributing factors. Here, we use the landscape modelling code pyBadlands to (1) investigate the development of stratigraphic sequences in a source-to-sink context; (2) assess the respective performance of two well-established stratigraphic interp

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14

Li, Ying, Gui Zhang Zhao, Lei Zeng, and Cun Liang Wang. "Vegetation-Groundwater Relationship Model for Subei Lake Watershed and Prediction of Vegetation Succession Rules under Exploitation." Advanced Materials Research 518-523 (May 2012): 4315–20. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.4315.

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Located in an arid and semi-arid region with low rainfall and high evaporation, the Subei Lake watershed has fragile ecological environment; the impact of groundwater level recession on vegetation ecology is the key problem for the exploitation and utilization of groundwater resource in this region. In this paper, a succession model for vegetation and burial depth of groundwater level was constructed through field survey, and was used along with numeric simulation to predict the change in burial depth of groundwater level in the study area under exploitation and to analyze and predict the vege

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15

Xie, Xizhuang, and Meixiang Chen. "Global stability of a tridiagonal competition model with seasonal succession." Mathematical Biosciences and Engineering 20, no. 4 (2023): 6062–83. http://dx.doi.org/10.3934/mbe.2023262.

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<abstract><p>In this paper, we investigate a tridiagonal three-species competition model with seasonal succession. The Floquet multipliers of all nonnegative periodic solutions of such a time-periodic system are estimated via the stability analysis of equilibria. Together with the Brouwer degree theory, sufficient conditions for existence and uniqueness of the positive periodic solution are given. We further obtain the global dynamics of coexistence and extinction for three competing species in this periodically forced environment. Finally, some numerical examples are presented to

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16

Iqbal, Naveed, Muhammad Tajammal Chughtai, and Nehad Ali Shah. "Numerical simulation of fractional-order two-dimensional Helmholtz equations." AIMS Mathematics 8, no. 6 (2023): 13205–18. http://dx.doi.org/10.3934/math.2023667.

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<abstract><p>In this paper, we investigate the exact solutions of several fractional-order Helmholtz equations using the homotopy perturbation transform method. We specify sufficient requirements for its convergence and provide error estimations. The homotopy perturbation transform method yields a quickly converging succession of solutions. Solutions for various fractional space derivatives are compared to present approaches and explained using figures. Appropriate parameter selection produces approximations identical to the exact answer. Test examples are provided to demonstrate t

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17

Abd, Nada, and Shatha Salman. "The Similarity Between Two DNA Successions by Proposed Distance Estimations." International Journal of Mathematics and Computer Science 20, no. 1 (2024): 67–78. http://dx.doi.org/10.69793/ijmcs/01.2025/shatha.

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The specific growth requirement for normal growth is nuclear tolerance called helical DNA due to a wide range of cells and is also known to be associated with special harvesting genetics. The aim of this research is to study the similarity between my series and consciousness. The control carried out in our current review is on the chains that control the body of humans, orangutans and gorillas. The graph hypothesis was used to examine genetic association and is a numerical approach. This methodology commenced by regarding the DNA clusters of each element as a coordinate graph. Hence, the proxi

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18

Ha, Kyoung-Sook, та Sa-Whae Gu. "Literary Review Lyrics of the New Modern Age [Numerical song(數字歌)]and the Succession of Numerical Songs". EASTERN CLASSIC STUDIES 43 (31 серпня 2020): 213–38. http://dx.doi.org/10.25086/hsdy.2020.43.213.

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19

McDougall, I., and R. T. Watkins. "Potassium–argon ages of volcanic rocks from northeast of Lake Turkana, northern Kenya." Geological Magazine 125, no. 1 (1988): 15–23. http://dx.doi.org/10.1017/s001675680000933x.

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AbstractThe Asille Group, a 1500 m succession comprising dominantly basaltic lavas but with interbedded sediments and silicic volcanics, lies unconformably upon metamorphosed basement northeast of Lake Turkana. Concordant K–Ar ages on alkali feldspars from pantelleritic units in the succession show that the Langaria Formation erupted 26.9±0.3 Ma ago in late Oligocene time, that Gum Dura Formation volcanism occurred at 15.8±0.2 Ma (early Miocene), and that there was widespread middle Miocene silicic volcanism at 13.0±0.3 Ma. Younger basaltic volcanism producing the flood lavas of the Gombe Grou

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20

Timmermann, Axel, Kyung-Sook Yun, Pasquale Raia, et al. "Climate effects on archaic human habitats and species successions." Nature 604, no. 7906 (2022): 495–501. http://dx.doi.org/10.1038/s41586-022-04600-9.

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AbstractIt has long been believed that climate shifts during the last 2 million years had a pivotal role in the evolution of our genus Homo1–3. However, given the limited number of representative palaeo-climate datasets from regions of anthropological interest, it has remained challenging to quantify this linkage. Here, we use an unprecedented transient Pleistocene coupled general circulation model simulation in combination with an extensive compilation of fossil and archaeological records to study the spatiotemporal habitat suitability for five hominin species over the past 2 million years. W

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21

DONG, S., and X. ZHENG. "Direct numerical simulation of spiral turbulence." Journal of Fluid Mechanics 668 (December 13, 2010): 150–73. http://dx.doi.org/10.1017/s002211201000460x.

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In this paper, we present results of three-dimensional direct numerical simulations of the spiral turbulence phenomenon in a range of moderate Reynolds numbers, in which alternating intertwined helical bands of turbulent and laminar fluids co-exist and propagate between two counter-rotating concentric cylinders. We show that the turbulent spiral is comprised of numerous small-scale azimuthally elongated vortices, which align into and collectively form the barber-pole-like pattern. The domain occupied by such vortices in a plane normal to the cylinder axis resembles a ‘crescent moon’, a shape m

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22

Zhuravlev, Andrey. "Numerical modelling of primary bioproductivity of the Palaeozoic pelagic ecosystems." Vestnik of geosciences, no. 8 (November 10, 2022): 38–43. http://dx.doi.org/10.19110/geov.2022.8.4.

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The article considers an approach to the reconstruction of the bioproductivity of Palaeozoic pelagic ecosystems based on the numeric modelling of the carbon isotope fractionation. The model uses information on the carbon dioxide content in atmosphere, water temperature, and carbon isotopic composition of carbonates and conodont elements. The developed model is tested on the material from the Upper Devonian — Lower Carboniferous of the northern Cis-Urals (successions of carbonate platform and slope of intrashelf depression). It allows reconstructing of the primary productivity of the Palaeozoic

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23

Zhang, Zizhen, and Limin Song. "Dynamics of a Computer Virus Propagation Model with Delays and Graded Infection Rate." Advances in Mathematical Physics 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/4514935.

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A four-compartment computer virus propagation model with two delays and graded infection rate is investigated in this paper. The critical values where a Hopf bifurcation occurs are obtained by analyzing the distribution of eigenvalues of the corresponding characteristic equation. In succession, direction and stability of the Hopf bifurcation when the two delays are not equal are determined by using normal form theory and center manifold theorem. Finally, some numerical simulations are also carried out to justify the obtained theoretical results.

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24

Hsieh, Tung-Yu, Chun-Jheng Yang, Feng Li, and Chyi-Rong Chiou. "Numerical Ecology and Social Network Analysis of the Forest Community in the Lienhuachih Area of Taiwan." Diversity 15, no. 1 (2023): 60. http://dx.doi.org/10.3390/d15010060.

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In this study, the integration of useful statistical methods from different disciplines for analyzing the forest community of the Lienhuachih area of central Taiwan was attempted. We employed a seriated heat map to confirm the presence of multiple community patterns in the area and used the gap statistics and a clustplot to confirm the number and structure of the patterns, respectively. A minimum spanning tree was used to display a succession series among the quadrats, and Renyi diversity was used to indicate the species composition of these patterns. The results confirmed the existence of six

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Hollohan, Brendan T., Patrick E. Dabinett, and John A. Gow. "Bacterial succession during biodegradation of the kelp Alaria esculenta (L.) Greville." Canadian Journal of Microbiology 32, no. 6 (1986): 505–12. http://dx.doi.org/10.1139/m86-092.

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In northern latitudes large quantities of kelp can be dislodged by ice scouring during spring and early summer. Quantities of kelp are then available to enter the detrital food chain. Bacterial succession, on decaying fronds of the brown macroalga Alaria esculenta, was investigated. There was a loss of approximately 70% of the algal mass during late spring and summer. During this time Vibrio dominated the heterotrophic bacterial population. Species of marine Pseudomonas comprised about 10–30% of the population, depending upon the occasion of isolation. By using numerical taxonomy it was shown

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Yokoyama, Yujiro, Tomoyuji Mizukoshi, Itsuo Ishigami, and Tateo Usui. "Numerical Analysis and Control of Gas Carburizing under Changes in Gas Compositions." Materials Science Forum 522-523 (August 2006): 589–94. http://dx.doi.org/10.4028/www.scientific.net/msf.522-523.589.

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Low carbon steel, S15CK, was carburized at 1203K up to 12.93ks in a commercial furnace where RX gas converted from propane was employed as carrier gas. Gas compositions in the furnace were changed intentionally; consequently carbon potential changed from 0.8 to 1.2 mass%. The carbon content profiles were determined by a succession of grindings and carbon analyses of the ground surfaces with a vacuum type emission spectrometer. A mathematical model for calculation of carbon content profiles is proposed to describe carburizing behavior under time-variant gas compositions in a furnace. The calcul

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Derekx, Q., P. Bacchin, D. Veyret, K. Glucina, and P. Moulin. "Simulation of particle capture in a microfiltration membrane." Water Science and Technology 64, no. 6 (2011): 1368–73. http://dx.doi.org/10.2166/wst.2011.349.

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The present study takes an interest in the description of the fouling mechanisms by a numerical approach at the microscopic scale. At first, an X-ray tomography has enabled the modelling of the membrane structure for the numerical simulations. Next, for different particle size, a same volume of particles has been sent in the modelled membrane and the final permeability has been computed. Thus, the influence of the particle size on the fouling has been seen. An observation of the particles penetration in the membrane has been realised to detail this influence. The Hermia relations were used in

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Yakovlev, P. A. "Fast trie-based method for multiple pairwise sequence alignment." Доклады Академии наук 484, no. 4 (2019): 401–4. http://dx.doi.org/10.31857/s0869-56524844401-404.

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A method for efficient comparison of a symbol sequence with all strings of a set is presented, which performs considerably faster than the naive enumeration of comparisons with all strings in succession. The procedure is accelerated by applying an original algorithm combining a prefix tree and a standard dynamic programming algorithm searching for the edit distance (Levenshtein distance) between strings. The efficiency of the method is confirmed by numerical experiments with arrays consisting of tens of millions of biological sequences of variable domains of monoclonal antibodies.

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Porta, P. A., L. M. Hoffer, H. Grassi, and G. L. Lippi. "Control of Turn-On in Class B Lasers." International Journal of Bifurcation and Chaos 08, no. 09 (1998): 1811–19. http://dx.doi.org/10.1142/s0218127498001522.

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A very simple technique, which uses a succession of two different but constant levels in the pump parameter, is shown to be quite effective in controlling the turn-on transient of a class B laser. In particular,a drastic reduction in the delay time, as well as a lowering of the intensity overshoot under suitable conditions, has been observed both in numerical simulations and in experiments on a CO 2 laser. Such a straightforward, nonfeedback technique may have very promising applications in the realm of communications.

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McSorley, Robert. "Ecology of the dorylaimid omnivore genera Aporcelaimellus, Eudorylaimus and Mesodorylaimus." Nematology 14, no. 6 (2012): 645–63. http://dx.doi.org/10.1163/156854112x651168.

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Eudorylaimus, Aporcelaimellus and Mesodorylaimus are dominant members of the omnivorous nematode fauna in Florida, USA. Ecological studies that included numerical data on these genera were reviewed to determine key aspects of their ecology and behaviour. These three genera were also the dominant omnivores in many parts of Europe and often occurred together. Multiple species within genera may be present in samples as well. Although results varied with habitat, these omnivores were present in nearly all stages of succession but often reached their greatest numbers in later stages of succession s

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Gniadek, Jacek, Jacek M. Pijanowski, and Mateusz Śmigielski. "Impact of the forest succession on efficiency of the arable land production." Journal of Water and Land Development 34, no. 1 (2017): 131–38. http://dx.doi.org/10.1515/jwld-2017-0046.

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Abstract The paper presents the studies involving analysis of changes in shape of parcels of arable land under the influence of forest succession. The object of the research is the village Grębosze located in Świętokrzyskie voivodeship. The study material will cover all arable land existing in the studied village. The source of data were numerical registry maps from 1998 and 2013. The basic element of research, enabling comparison of changes in the efficiency of the production process are continuous parts of the parcels covered by one form of use. In the course of the output data processing an

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Di Stefano, Agata, Natale Maria D’Andrea, Salvatore Distefano, et al. "Calcareous Nannofossil Biostratigraphy and Biochronology at ODP Site 1123 (Offshore New Zealand): A Reference Section for the Last 20 Myr in the Southern Ocean." Journal of Marine Science and Engineering 11, no. 2 (2023): 408. http://dx.doi.org/10.3390/jmse11020408.

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The quantitative analysis of the calcareous nannofossil content yield in the 600 m thick succession drilled at ODP Site 1123 (offshore New Zealand), considered as a reference section for the Southern Ocean region, allowed the recognition of 43 bioevents distributed along the last 20 Myr. The correlation with the excellent magnetostratigraphic record resulted in the attribution of numerical ages for the position of the detected horizons. Many of the marker species used in previous zonation were detected also at ODP Site 1123, but others revealed to be absent or of scarce applicability. On the o

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Stephan, Jean, Julien Barhoun, Elias Maatouk, Bruno Foucault, and Samir Safi. "Syntaxonomy of open oak forests on basalt formations in north Lebanon." Lebanese Science Journal 20, no. 3 (2019): 391–412. http://dx.doi.org/10.22453/lsj-020.3.391-412.

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This phytosociological study of the Dreib Region in Akkar-Lebanonis the first on basaltic bedrockin Lebanon. Thesynusial methods isused and compared bynumerical classification. The latter shows satisfactory results when compared to the synusial manual classification. The followingplant associations are defined:Quercetum veneris–ithaburensis, Calicotomo villosae –Rhamnetum punctati, Eryngio cretici –Echietum angustifolii and Sileno aegyptiacae –Isatidetum lusitanicae.Consequently, the alliance Quercion ithaburensi is stated for the first time in Lebanon. Vegetationseries for progressive and reg

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Sun, Ke, Zhongfeng Qiu, Yijun He, Wei Fan, and Zexun Wei. "Succession of causative species during spring blooms in the East China Sea: coupled biophysical numerical modeling." Acta Oceanologica Sinica 35, no. 12 (2016): 1–11. http://dx.doi.org/10.1007/s13131-016-0964-0.

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Hasanah, Putri Sholehah, Bistari Bistari, and Dian Ahmad BS. "Kemampuan Pemahaman Matematis Siswa dalam Menyelesaikan Soal Cerita Dikaji dari Sikap Ilmiah." AS-SABIQUN 4, no. 4 (2022): 1043–57. http://dx.doi.org/10.36088/assabiqun.v4i4.2142.

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This review plans to depict and dissect the understudies' numerical comprehension capacity in taking care of story issues contemplated from the logical disposition on the material of arrangements and series in class XI IPA 3 SMA Negeri 9 Pontianak. This exploration is a subjective elucidating study. Information on understudies' numerical comprehension capacities were gathered through tests and meetings. Information on understudies' logical perspectives were gathered through perception and meetings. The information sources were three understudies who were chosen as examination subjects, specifi

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Falcone, Gaetano, Giuseppe Naso, Federico Mori, et al. "Effect of Base Conditions in One-Dimensional Numerical Simulation of Seismic Site Response: A Technical Note for Best Practice." GeoHazards 2, no. 4 (2021): 430–41. http://dx.doi.org/10.3390/geohazards2040024.

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The effects induced by the choice of numerical base conditions for evaluating local seismic response are investigated in this technical note, aiming to provide guidelines for professional applications. A numerical modelling of the seismic site response is presented, assuming a one-dimensional scheme. At first, with reference to the case of a homogeneous soil layer overlying a half-space, two different types of numerical base conditions, named rigid and elastic, were adopted to analyse the seismic site response. Then, geological setting, physical and mechanical properties were selected from Ita

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Leoveanu, Ioan Sorin, and Gheorghe Zgura. "Modelling the Heat and Fluid Flow in the Welded Pool from High Power Arc Sources." Materials Science Forum 580-582 (June 2008): 443–46. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.443.

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The paper proposes a numerical method for analyzing the complex phenomena’s that appear in the case of keyholes welded pool geometry. Present model consist in a succession of analyses steps, needed to solve the interaction between the liquid/solid, liquid/protection gaze and liquid/MHD welded arc for arc welding, or electrons, or electromagnetic waves. The liquid/solid geometry result by dissipation of the welding power source in a matrix of many point sources. This process gives a first approximation of temperature fields and a good approximation of the digit 3D position, and information abou

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Liu, Wei, and Yaolin Jiang. "Analysis of a Delayed Predator–Prey System with Harvesting." International Journal of Nonlinear Sciences and Numerical Simulation 19, no. 3-4 (2018): 335–49. http://dx.doi.org/10.1515/ijnsns-2017-0094.

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AbstractThis article is concerned with a Leslie–Gower predator–prey system with the predator being harvested and the prey having a delay due to the gestation of prey species. By regarding the gestation delay as a bifurcation parameter, we first derive some sufficient conditions on the stability of positive equilibrium point and the existence of Hopf bifurcations basing on the local parametrization method for differential-algebra system. In succession, we also investigate the direction of Hopf bifurcations and the stability of bifurcating periodic solutions on the center manifold by employing t

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Huang, Edward, Mourad Oudich, Hyeonu Heo, and Yun Jing. "Ultra-stiff and ultra-light architected metamaterial for vibration mitigation." Journal of the Acoustical Society of America 152, no. 4 (2022): A170. http://dx.doi.org/10.1121/10.0015918.

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We designed, fabricated, and experimentally validated an architected mechanical metamaterial vibration shielding while ensuring high effective stiffness with low density. The structure is made of a periodic succession of octet truss units with alternating circular strut diameters. The octet truss endows the meta-structure with a high effective stiffness and a low effective density, while alternating the units with different struts radii enables the opening of a wide band-gap for elastic waves. Samples were 3D printed and experimentally validated using a shaker and accelerometer. Unidirectional

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Guo, Hong Wei, Hong Zheng, and Wei Li. "Implement of Ameliorated ACM Element in Numerical Manifold Space for Tackling Kirchhoff Plate Bending Problems." Applied Mechanics and Materials 638-640 (September 2014): 1710–15. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1710.

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Ab ridging the chasm between the prevalent ly employed continuum methods (e.g. FEM) and discontinuum methods (e.g. DDA) ,the numerical manifold (NNM) ,which utilizes two covers, namely the mathematical cover and physical cover , has evinced various advantages in solving solid mechanic al issues. The forth-order partial elliptic differential equation governing Kirchhoff plate bending makes it arduous to establish the -regular Lagrangian partition of unity ,nevertheless, this study renders a modified conforming ACM manifold element , irrespective of accreting its cover degrees, to resolve the fo

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He, Xi, and Russell A. Wright. "An Experimental Study of Piscivore–Planktivore Interactions: Population and Community Responses to Predation." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 6 (1992): 1176–83. http://dx.doi.org/10.1139/f92-132.

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The population dynamics and behavior of an assemblage of fishes in a small bog lake were studied in a succession of whole-lake manipulations of piscivores. Total prey fish biomass declined after the addition of northern pike (Esox lucius). This decline was the result of emigration by cyprinid prey and consumption by northern pike. The emigration response of the cyprinids was dependent on cyprinid density. At high prey fish biomass, a significant portion of the loss in biomass was the result of emigration; this was not the case at low prey fish biomass. The prey fish community shifted from smal

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Zhou, Zheng-Xi, Ren-Cheng Yu, and Ming-Jiang Zhou. "Seasonal succession of microalgal blooms from diatoms to dinoflagellates in the East China Sea: A numerical simulation study." Ecological Modelling 360 (September 2017): 150–62. http://dx.doi.org/10.1016/j.ecolmodel.2017.06.027.

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Zhu, Liangsheng, and Qing Wang. "Numerical Mesocosm Experimental Study on Harmful Algal Blooms of Two Algal Species in the East China Sea." Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/169860.

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From the results of algal culture and mesocosm experiments, a numerical mesocosm experiment is designed that accounts for the effect of the marine environment (sea currents, nutrient levels, and temperature) on the harmful algal bloom (HAB) processes ofSkeletonema costatumandProrocentrum donghaiense, two of the most frequent HAB-associated species in the East China Sea. Physical and ecological environment of the waters is simulated numerically by applying a hydrodynamic-ecological-one-way-coupled marine culture box model, which is semienclosed. The algal growth rate is digitalized by a tempera

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Runtz, M. W. P., and Stewart B. Peck. "THE BEETLE FAUNA OF A MATURE SPRUCE–SPHAGNUM BOG, ALGONQUIN PARK, ONTARIO; ECOLOGICAL IMPLICATIONS OF THE SPECIES COMPOSITION." Memoirs of the Entomological Society of Canada 126, S169 (1994): 161–71. http://dx.doi.org/10.4039/entm126169161-1.

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AbstractThe beetle (Coleoptera) fauna of a black spruce [Picea mariana (Mill.) BSP] – tamarack [Larix laricina (DuRoi) K. Koch] – Sphagnum bog in Algonquin Provincial Park, Ontario, was sampled from early June to mid-August with yellow pan traps and emergence traps. The yield was 5734 beetles, in 30 families. Ptiliidae was the most numerically abundant and Staphylinidae was the most taxonomically diverse. Carabidae was second in diversity and third in numerical abundance. The abundance and ecological implications of some individual species are discussed. Few of the species are bog-specific. Th

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Audemar, Vassanti, Thomas Podgorski, and Gwennou Coupier. "Rheology and structure of a suspension of deformable particles in plane Poiseuille flow." Physics of Fluids 34, no. 4 (2022): 042013. http://dx.doi.org/10.1063/5.0087378.

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We present an experimental study of the rheology and structure of a confined suspension of deformable particles flowing in a quasi-two-dimensional Poiseuille flow. Thanks to a precise microfluidic viscosimetry technique combined with measurements of concentration profiles, our study provides the first experimental confirmation with three-dimensional particles of a strong relationship between structuring effects and rheology, previously only reported in numerical simulations of purely two-dimensional systems. In conditions where strong structuring effects take place due to confinement, the evol

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Sellwood, J. A. "Spiral instabilities in N-body simulations – II. Emergence from noise." Monthly Notices of the Royal Astronomical Society 492, no. 3 (2020): 3103–6. http://dx.doi.org/10.1093/mnras/staa034.

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ABSTRACT An earlier paper presented the potentially significant discovery that disturbances in simplified simulations of a stellar disc model that was predicted to be stable in linear theory grew to large amplitude over a long period of time. The ultimate appearance of true instabilities was attributed to non-linear scattering by a succession of collective waves excited by shot noise from the finite number of particles. The paper concluded that no finite number of particles, however large, could mimic a smooth disc. As this surprising finding has been challenged as an artefact of the numerical

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Salles, Tristan, Jodie Pall, Jody M. Webster, and Belinda Dechnik. "Exploring coral reef responses to millennial-scale climatic forcings: insights from the 1-D numerical tool pyReef-Core v1.0." Geoscientific Model Development 11, no. 6 (2018): 2093–110. http://dx.doi.org/10.5194/gmd-11-2093-2018.

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Abstract. Assemblages of corals characterise specific reef biozones and the environmental conditions that change spatially across a reef and with depth. Drill cores through fossil reefs record the time and depth distribution of assemblages, which captures a partial history of the vertical growth response of reefs to changing palaeoenvironmental conditions. The effects of environmental factors on reef growth are well understood on ecological timescales but are poorly constrained at centennial to geological timescales. pyReef-Core is a stratigraphic forward model designed to solve the problem of

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Di Maida, P., and G. Bianchi. "Numerical Investigation of Pull-In Instability in a Micro-Switch MEMS Device through the Pseudo-Spectral Method." Modelling and Simulation in Engineering 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/8543616.

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A pseudo-spectral approximation is presented to solve the problem of pull-in instability in a cantilever micro-switch. As well known, pull-in instability arises when the acting force reaches a critical threshold beyond which equilibrium is no longer possible. In particular, Coulomb electrostatic force is considered, although the method can be easily generalized to account for fringe as well as Casimir effects. A numerical comparison is presented between a pseudo-spectral and a Finite Element (FE) approximation of the problem, both methods employing the same number of degrees of freedom. It is

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KLUNK, M. A., S. DASGUPTA, M. DAS, P. R. WANDER, and A. DI CAPUA. "GEOCHEMICAL SPECIATION AND BATCH MODE SIMULATION IN THE CARBONATE DEPOSITIONAL ENVIRONMENTS." Periódico Tchê Química 16, no. 33 (2019): 736–48. http://dx.doi.org/10.52571/ptq.v16.n33.2019.751_periodico33_pgs_736_748.pdf.

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Geochemical modeling has been frequently used to understand and interpret water-rock interactions in sedimentary basins. Thermodynamic data, kinetic parameters, numerical methods, boundary history, and boundary conditions are factors affecting any geochemical modeling system. In the present study, we have attempted to establish a geochemical speciation model by comparing the interaction of formation water and carbonate rock in the carbonate depositional settings of Cambrian successions of Bachu and Tarim area. A comparative study of geochemical speciation has been performed using four differen

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Sinnesael, Matthias, Alfredo Loi, Marie-Pierre Dabard, Thijs R. A. Vandenbroucke, and Philippe Claeys. "Cyclostratigraphy of the Middle to Upper Ordovician successions of the Armorican Massif (western France) using portable X-ray fluorescence." Geochronology 4, no. 1 (2022): 251–67. http://dx.doi.org/10.5194/gchron-4-251-2022.

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Abstract. To expand traditional cyclostratigraphic numerical methods beyond their common technical limitations and apply them to truly deep-time archives, we need to reflect on the development of new approaches to sedimentary archives that are not traditionally targeted for cyclostratigraphic analysis but that frequently occur in the impoverished deep-time record. Siliciclastic storm-dominated shelf environments are a good example of such records. Our case study focuses on the Middle to Upper Ordovician siliciclastic successions of the Armorican Massif (western France) that are well-studied ex

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