Bibliographies thématiques / Twin basins

Sommaire

  1. Articles de revues
  2. Thèses
  3. Livres
  4. Chapitres de livres
  5. Actes de conférences
  6. Rapports d'organisations

Littérature scientifique sur le sujet « Twin basins »

Auteur : Grafiati
Publié le 18 mai 2024

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Twin basins ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Twin basins"

1

Wu, Xiaotao, Guihua Lu et Zhiyong Wu. « Remote Sensing Technology in the Construction of Digital Twin Basins : Applications and Prospects ». Water 15, no 11 (27 mai 2023) : 2040. http://dx.doi.org/10.3390/w15112040.

Texte intégral
Résumé :
A digital twin basin serves as a virtual representation of a physical basin, enabling synchronous simulation, virtual–real interaction, and iterative optimization. The construction of a digital twin basin requires a basin database characterized by large-scale coverage, high-precision, high-resolution, and low-latency attributes. The advancements in remote sensing technology present a new technical means for acquiring essential variables of the basin. The purpose of this paper was to provide a comprehensive overview and discussion of the retrieval principle, data status, evaluation and inter-comparison, advantages and challenges, applications, and prospects of remote sensing technology in capturing seven essential variables, i.e., precipitation, surface temperature, evapotranspiration, water level, river discharge, soil moisture, and vegetation. It is indicated that remote sensing can be applied in some digital twin basin functions, such as drought monitoring, precipitation forecasting, and water resources management. However, more effort should be paid to improve the data accuracy, spatiotemporal resolution, and latency through data merging, data assimilation, bias correction, machine learning algorithms, and multi-sensor joint retrieval. This paper will assist in advancing the application of remote sensing technology in constructing a digital twin basin.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Yang, Fangyan, Yongming Cao, Lijuan Chen et Qingdu Li. « Sequence of Routes to Chaos in a Lorenz-Type System ». Discrete Dynamics in Nature and Society 2020 (23 janvier 2020) : 1–10. http://dx.doi.org/10.1155/2020/3162170.

Texte intégral
Résumé :
This paper reports a new bifurcation pattern observed in a Lorenz-type system. The pattern is composed of a main bifurcation route to chaos (n=1) and a sequence of sub-bifurcation routes with n=3,4,5,…,14 isolated sub-branches to chaos. When n is odd, the n isolated sub-branches are from a period-n limit cycle, followed by twin period-n limit cycles via a pitchfork bifurcation, twin chaotic attractors via period-doubling bifurcations, and a symmetric chaotic attractor via boundary crisis. When n is even, the n isolated sub-branches are from twin period-n/2 limit cycles, which become twin chaotic attractors via period-doubling bifurcations. The paper also shows that the main route and the sub-routes can coexist peacefully by studying basins of attraction.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Henriksen, Hans Jørgen, Raphael Schneider, Julian Koch, Maria Ondracek, Lars Troldborg, Ida K. Seidenfaden, Søren Julsgaard Kragh, Eva Bøgh et Simon Stisen. « A New Digital Twin for Climate Change Adaptation, Water Management, and Disaster Risk Reduction (HIP Digital Twin) ». Water 15, no 1 (21 décembre 2022) : 25. http://dx.doi.org/10.3390/w15010025.

Texte intégral
Résumé :
The paper analyzes the national DK-model hydrological information and prediction (HIP) system and HIP portal viewed as a ‘digital twin’ and how the introduction of real-time dynamic updating of the DK-model HIP simulations can make room for plug-in submodels with real-time boundary conditions made available from an HIP portal. The possible feedback to a national real-time risk knowledge base during extreme events (flooding and drought) is also discussed. Under climate change conditions, Denmark is likely to experience more rain in winter, more evapotranspiration in summer, intensified cloudbursts, drought, and sea level rise. These challenges were addressed as part of the Joint Governmental Digitalization Strategy 2016–2020 for better use and sharing of public data about the terrain, water, and climate to support climate adaptation, water management, and disaster risk reduction. This initiative included the development of a new web-based data portal (HIP portal) developed by the Danish Agency for Data Supply and Infrastructure (SDFI). GEUS delivered 5 terabytes of hydrological model data to the portal, with robust calibration methods and hybrid machine learning (ML) being key parts of the deliverables. This paper discusses the challenges and potentials of further developing the HIP digital twin with ‘plug-in digital twins’ for local river basins, including feedback to the national level.
Styles APA, Harvard, Vancouver, ISO, etc.
4

KATZ, ANDREW L., et EARL H. DOWELL. « FROM SINGLE WELL CHAOS TO CROSS WELL CHAOS : A DETAILED EXPLANATION IN TERMS OF MANIFOLD INTERSECTIONS ». International Journal of Bifurcation and Chaos 04, no 04 (août 1994) : 933–41. http://dx.doi.org/10.1142/s0218127494000666.

Texte intégral
Résumé :
The study of stable and unstable manifolds, and their intersections with each other, is a powerful technique for interpreting complex bifurcations of nonlinear systems. The escape phenomenon in the twin-well Duffing oscillator is one such bifurcation that is elucidated through the analysis of manifold intersections. In this paper, two escape scenarios in the twin-well Duffing oscillator are presented. In each scenario, the relevant manifold structures are examined for parameter values on either side of the escape bifurcation. Included is a description of the role of the hilltop saddle stable manifolds, which are known to separate the single well basins (should single well attractors exist). In each of the two bifurcation scenarios, it is shown through a detailed analysis of Poincaré maps that a homoclinic intersection of the manifolds of a specific period-3 saddle implies the destruction of the single well chaotic attractor. Although the Duffing oscillator is used to illustrate the ideas advanced here, it is thought that the approach will be useful for a variety of dynamical systems.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Todd, M. D., et L. N. Virgin. « An Experimental Verification of Basin Metamorphoses in A Nonlinear Mechanical System ». International Journal of Bifurcation and Chaos 07, no 06 (juin 1997) : 1337–57. http://dx.doi.org/10.1142/s0218127497001060.

Texte intégral
Résumé :
This paper describes bifurcations and the basin boundary metamorphoses that give rise to post-fold outcome indeterminacy from a primarily experimental perspective. A gravity-loaded cart-and-track system is constrained to mimic the twin-well, single-degree-of-freedom Duffing oscillator. Of primary interest is the study of how motion, initially contained within a single well, "spills over" into the adjacent well. Although this system is globally bounded, it retains the same generic features of the single-well canonical escape equation. Using time-embedded coordinates, the technique of stochastic interrogation is used to generate the initial condition maps at three different forcing levels corresponding to three different regimes of post-fold outcomes. These three regions are characterized, respectively, by smooth basin boundaries with safe jumps to resonance, fractal basin boundaries with jumps that may or may not restabilize on to the resonant attractor, and eroded basins with unsafe jumps leading to escape from the local well. This experiment successfully replicates much of the subtle global behavior observed in numerical simulations.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Mottier, V., F. Brissaud, P. Nieto et Z. Alamy. « Wastewater treatment by infiltration percolation : a case study ». Water Science and Technology 41, no 1 (1 janvier 2000) : 77–84. http://dx.doi.org/10.2166/wst.2000.0014.

Texte intégral
Résumé :
A 1700 p.e. pilot infiltration percolation plant treating the sewage of Mazagon, a seaside resort in the South of Spain, is investigated. Primary effluents, intermittently applied over twin 200 m2 infiltration basins, percolate down to the aquifer through unsaturated dune sands. Each application sequence delivers a volume of 0.25 m3 per m2 of infiltration basin. Analyses of the water sampled at five depths ranging from 0.3 to 2.0 m below the infiltration surface show that the oxidation performance of the plant is highly dependent on the applied load. Monitoring the oxygen content in the air phase of the vadose zone allows to determine the kinetics of the oxygen stock recovery and the oxidation capacity of the plant. Disappointing removal of faecal coliforms and streptococci is attributed to high pore water velocities due to infiltration heterogeneity and the high water height applied during each feeding sequence.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Szemplińska-Stupnicka, W., et E. Tyrkiel. « Sequences of Global Bifurcations and the Related Outcomes after Crisis of the Resonant Attractor in a Nonlinear Oscillator ». International Journal of Bifurcation and Chaos 07, no 11 (novembre 1997) : 2437–57. http://dx.doi.org/10.1142/s0218127497001631.

Texte intégral
Résumé :
The problem of the system behavior after annihilation of the resonant attractor in the region of the nonlinear resonance hysteresis is considered. The sequences of global bifurcations, in connection with the associated metamorphoses of basins of attraction of coexisting attractors, are examined. The study allows one to reveal the mechanism that governs the phenomenon of the post crisis ensuing transient trajectory to settle onto one or another remote attractor. The problem is studied in detail for the twin-well potential Duffing oscillator. The boundary which splits the considered region of system parameters into two subdomains, where the outcome is unique or the two outcomes are possible, is defined.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Szemplińska-Stupnicka, Wanda, et Krzysztof L. Janicki. « Basin Boundary Bifurcations and Boundary Crisis in the Twin-Well Duffing Oscillator : Scenarios Related to the Saddle of the Large Resonant Orbit ». International Journal of Bifurcation and Chaos 07, no 01 (janvier 1997) : 129–46. http://dx.doi.org/10.1142/s0218127497000091.

Texte intégral
Résumé :
Bifurcation phenomena in the twin-well Duffing system are considered for such regions of the system parameters, where the saddle DL associated with the two-well T-periodic attractor (large orbit) undergoes homoclinic bifurcation. In particular, a co-dimension-two bifurcation, the bifurcation defined by the intersection of the homoclinic bifurcation of the large orbit with the saddle-node bifurcation of the nonresonant single-well orbit in the system parameter plane is the main point of interest. In the four subdomains around the co-dimension-two point, the manifold structure of the saddle DL and the basins of attractions are studied numerically. The analysis reveals new phenomena and new features of the system behavior. A complex bifurcational structure is observed that includes boundary crisis of the cross-well chaotic attractor, intermittency (subduction) phenomena, and explosion of the basin of attraction of the large orbit. The analysis also explains why, in one of the subdomains, the two-well T-periodic attractor (large orbit) becomes the unique attractor of the system.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Nath, Rupak, et S. Kharbuli. « Cyprinid Fishes : An Overview on the Present Status in Meghalaya, India ». Spectrum : Science and Technology 7, no 1 (15 décembre 2020) : 13–22. http://dx.doi.org/10.54290/spect/2020.v7.1.0002.

Texte intégral
Résumé :
Cyprinid fishes of Meghalaya were investigated from twin drainage basins Brahmaputra and Barak-Surma-Meghna. 27 cyprinid fishes under 14 genus and 7 sub families were recorded from rivers and reservoirs of four different gradient zones. The diversity of Cyprinid fishes was highest with 49% representation of Cyprinids at lower elevation Zone IV below 500 m above MSL and bio diversity indices estimated as H: 3.05, 1-D: 0.10. In contrary lowest diversity with 7% representation of fishes was observed at elevation 1501 to 2000 m above MSL in Zone I with bio diversity indices H: 0.25, 1-D: 0.57. Distribution of commercially important cyprinids under genus Labeo, Systomus and Cirrhinus were found to be restricted to rivers of Barak-Surma-Meghna drainage basin. Catch percentage of cyprinids indicates that 70% of fishes exhibit occasional occurrence and 30% as common occurrence. High percentage of occasional occurrence, low catch composition percentage and with restricted distribution of commercially important fishes to only certain rivers of Barak-Surma-Meghna drainage is an indication of depletion of cyprinid resources in the state and requires taking multi prong conservation measures to protect cyprinid fishes in Meghalaya.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Rao, Xiaokang, Rui Ma, Li Zhang et Jia Liu. « Research and design of a digital twin-driven smart river basin platform ». Metaverse 3, no 2 (26 juillet 2022) : 11. http://dx.doi.org/10.54517/m.v3i2.1815.

Texte intégral
Résumé :
<p>River basin management involves many issues including water resources, water ecology, water environment, and water disasters. Digital twins integrated with GIS, BIM and IoT are applied to river basin management, to establish digital twin data and model integration and visual expression methods, study the digital twin operation mechanism, build smart river basin twin, and design a digital twin-driven smart river basin platform. Taking the joint flood dispatching management and control of the reservoir group in the Duhe River Basin as an example. The application has proven that: compared with the problems of incomplete information, insufficient accuracy, lagging feedback and single expression in traditional basin database management or two-dimensional plane management, the digital twin-driven smart basin platform, on the basis of the integration and interaction of GIS data, BIM data and IoT data, and on the basis of data and model two-way drive, can realize simulation, decision making, optimization and visualization in external environment, and the control effect is better than traditional means. The research and practice of the platform can realize real-time monitoring, diagnosis, analysis, decision making and prediction for river basin management, providing a new solution for its intelligent operation, precise control and safe operation and maintenance.</p>
Styles APA, Harvard, Vancouver, ISO, etc.
Plus de sources

Thèses sur le sujet "Twin basins"

1

Mirumachi, Naho. « Study of conflict and cooperation in international transboundary river basins : the twins framework ». Thesis, King's College London (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.647713.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Vasylenko, O. V., G. V. Snizhnoi et Yu S. Yamnenko. « Mechatronics as a basis for cyber-physical systems ». Thesis, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19185.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Marzouki, Mohamed Amine. « Group-theoretical investigation of the structural basis for the formation of twinned crystals ». Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0102/document.

Texte intégral
Résumé :
Le travail de cette thèse porte sur les raisons structurales derrière la formation de cristaux maclés. Ce travail ouvre une voie pour un futur développement de protocoles de synthèse afin de réduire l'occurrence de macles. La motivation de cette étude est que la présence de macles affecte négativement les propriétés physico-chimiques des matériaux d'intérêts technologiques et réduit aussi la qualité des données expérimentales sur lesquelles se fonde l'analyse structurelle. Ce dernier problème est particulièrement sensible dans le cas de cristaux ayant des paramètres de maille importantes, comme les macromolécules biologiques. Les principes de symétrie responsables du phénomène de maclage dans le cas d’une macle de transformation ou d'origine mécanique sont bien connues. En revanche dans le cas d’une macle de croissance, le maclage est toujours considéré comme un accident lié aux conditions aléatoires de croissance cristalline où à la cinétique, plutôt qu'à la thermodynamique. Une approche générale connue comme la « théorie réticulaire des macles » a été développée depuis le XIXe siècle, fondée sur l'existence d'un sous-réseau commun aux cristaux maclés, qui donne les conditions nécessaires pour l'apparition d'une macle. Cette approche est cependant insuffisante pour déterminer la différence entre les macles avec le même degré de chevauchement des réseaux mais montrant une fréquence d'occurrence assez différente. Une approche structurale, fondée sur l'analyse de la symétrie propre des orbites cristallographiques a été proposée il y a plus d'un demi-siècle (Donnay et Curien, 1960), mais est restée à l'état embryonnaire, malgré une certaine reprise récente (Nespolo et Ferraris, 2009). En outre, l'idée qu'une interface commune aux cristaux maclés puisse contenir une opération reliant ces individus a été proposée (Holser, 1958) mais n'a jamais été portée à un plein développement. Dans cette thèse, nous présentons un développement algébrique de ces idées. Nous montrons que les conditions structurales nécessaires pour la formation d'une macle de croissance peuvent être formulées en se basant, notamment, sur la symétrie propre des orbites cristallographiques et sur le groupe sous-périodique de la couche transversale donnant la symétrie d'une couche commune. L'analyse détaillée dans cette thèse de trois macles fréquentes démontre une corrélation claire entre le degré de restauration de la structure par l'opération de maclage et la fréquence d'occurrence des macles. Un exemple négatif, à savoir une macle hypothétique dont on pourrait prévoir la formation sur la base de la théorie réticulaire a aussi été analysé. Le fait que cette macle n'ait jamais été observée, en raison d’une faible restauration de la structure qui serait produite par l'opération de macle, confirme le bien fondé de l'approche. Nous nous attendons à ce que la généralisation de l'approche présentée dans cette thèse fournisse une procédure semi-automatique pour prévoir la probabilité de formation d'une macle. Cela permettrait aux personnes travaillant dans la synthèse cristalline démoduler la fréquence de maclage. Le procédé fait appel à la modification de la morphologie du cristal pour une plus grande exposition et le développement des faces cristallines qui présentent une interface défavorable pour le maclage
This thesis addresses the structural rationale behind the formation of growth twins, with the purpose of opening a route to the future development of synthesis protocols to reduce the occurrence frequency of twinning. The reason for this effort is that twinning affects negatively the physico-chemical properties of materials and biomaterials of technological interests and reduces the quality of the experimental data on which the structural investigation is based. While on the one hand the reasons for twinning in transformation and mechanical twins are well understood, in the case of growth twins twinning is still seen as an accident linked to aleatory conditions where kinetics, rather than thermodynamics, plays a principal role. A general approach known as the reticular theory of twinning has been developed since the XIX century, based on the existence of a sublattice common to the twinned crystals, which gives the minimal necessary conditions for the occurrence of a twin. This approach is, however, insufficient to discriminate between twins with the same degree of lattice overlap but showing a fairly different occurrence frequency. A structural approach, based on the analysis of the eigensymmetry of the crystallographic orbits building a crystal structure was proposed more than half a century ago (Donnay and Curien, 1960) but remained at an embryonic state, despite some recent revival (Nespolo and Ferraris, 2009). Also, the idea that a slice common to the twinned individuals may contain an operation mapping these individuals was proposed (Holser, 1958) but never brought to a full development. In this thesis, we present a full development of these ideas and show that the structurally necessary conditions for the formation of a growth twin can be described on the basis of the eigensymmetry of the crystallographic orbits and on the sectional layer group giving the symmetry of the common slice. The detailed analysis of three well-know twins demonstrates a clear correlation between the degree of structural restoration by the twin operation and the occurrence frequency of the twins. The analysis of a negative example, i.e. of a hypothetical twin which one would expect on the basis of the reticular theory but has never been observed, strengthens the evidence of this correlation, because of the low structural restoration one would observe in that twin. We expect that the generalisation of the approach presented in this thesis through a semi-automatic procedure will provide crystal growers with a powerful tool to modulate the occurrence frequency of twinning through a modification of the crystal morphologies towards a larger exposure and development of crystal faces which represent an unfavorable interface for twinning
Styles APA, Harvard, Vancouver, ISO, etc.
4

Burgin, Hugo Bonython. « A Multiscale Approach towards the Characterisation of Upper Crustal Deformation at Passive Continental Margins : A Case Study on the Otway Basin, Australia ». Thesis, 2019. http://hdl.handle.net/2440/120858.

Texte intégral
Résumé :
This thesis presents a multiscale structural analysis of upper crustal deformation at a passive continental margin, using the Jurassic - Quaternary Otway Basin along Australia’s southern margin as a case study. Techniques of structural analyses across the micro (calcite twin, magnetic and porefabric analyses), meso (wellbore and outcrop natural fracture analysis) and macroscales (three-dimensional seismic interpretation) providing an effective means of characterising stress and strain across space and time. The integration of these investigative methods at a passive continental margin for the first time, has assisted in reducing structural uncertainty for basin evolution models, delivering original insights into the evolution of stress within these tectonic environments. The results of this study show magnitudes of maximum differential stress as high as 69MPa during extension and continental breakup, in contrast to magnitudes as low as 13MPa during basin inversion. The influence of high extensional stresses during continental break up, resulting in layer parallel stretching (LPSt), a microstructural strain which may develop in layered rock, characterised by an azimuth of stretching or thinning, orthogonal to the orientation of regional extensional faults. LPSt occurs in the early stages of extension, prior to the development of calcite twins, natural fractures, and faults which occur progressively as the intensity and duration of extension increases. This is evidenced in the Otway Basin, where Late Cretaceous aged NE-SW and N-S oriented LPSt is co-axial with extensional azimuths during that time, derived from the stress inversion of seismic scale faults, calcite twins and natural fractures from the outcrop and wellbore. The neotectonic preservation of LPSt in the Otway Ranges, an uplifted section of Early Cretaceous sediments in the Otway Basin, suggests that early grain-scale extensional strain can be preserved during ensuing phases of inversion at continental margins. As during the process of inversion, stress is primarily released through the reactivation of previously formed extensional fault and detachment systems. A process of deformation that results in low levels of coupling between the basement and cover, an observation that is supported by the low magnitudes of compressional stress (13MPa) calculated during the same period. Additionally, the results of this study have improved our understanding of sub-surface fluid flow in the Otway Basin. Geomechanical modelling demonstrating that low contemporary magnitudes of effective normal stress, acting on NW-SE oriented faults, striking parallel to the orientation of maximum horizontal stress, results in a high risk of fault dilation. This suggests that future efforts of exploration for conventional oil and gas systems within the Otway Basin, are best focused where E-W, N-S and NE-SW striking faults interact with the major NW-SE fabric, or where the influence of basin inversion is most pronounced. A major outcome of this study is a new structural framework for the Otway Basin, one that is defined by a consistent pattern of NW-SE striking faults across much of the basin, in contrast to the previous structural model of opposing fault trends in the west and east. The new framework characterises a structural trend that is consistent with faulting patterns in sedimentary provinces to the west and east along Australia’s southern margin.
Thesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2019
Styles APA, Harvard, Vancouver, ISO, etc.
5

Du, Juan [Verfasser]. « The twin agency problems in corporate finance : on the basis of Stulz's theory / vorgelegt von Juan Du ». 2009. http://d-nb.info/996530363/34.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Zönnchen, Jochen Hard [Verfasser]. « Modellierung der dreidimensionalen Dichteverteilung des geokoronalen Neutralwasserstoffes auf Basis von TWINS Ly-α-Intensitätsmessungen [Ly-Alpha-Intensitätsmessungen] / vorgelegt von Jochen Hard Zönnchen ». 2006. http://d-nb.info/981789447/34.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.

Livres sur le sujet "Twin basins"

1

Lv, Zhihan, et Elena Fersman, dir. Digital Twins : Basics and Applications. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Ramos, Fernando. Twin plant opportunities in the Caribbean Basin countries. [Puerto Rico] : Government Development Bank for Puerto Rico, 1985.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
8

E, Church S., et Geological Survey (U.S.), dir. Geochemical and lead-isotopic studies of river and lake sediments, upper Arkansas River basin, Twin Lakes to Pueblo, Colorado. [Denver, Colo.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
9

R, Mead Delbert, et Pacific Northwest Research Station (Portland, Or.), dir. Twig and foliar biomass estimation equations for major plant species in the Tanana River Basin of interior Alaska. [Portland, OR] : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1988.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
10

H, Faber Michael, et Eidgenössische Technische Hochschule. Institut für Baustatik und Konstruktion., dir. Failure consequences and reliability acceptance criteria for exceptional building structures : A study taking basis in the failure of the World Trade Center Twin Towers. Zurich : Institute of Structural Engineering, Swiss Federal Institute of Technology, 2004.

Trouver le texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
Plus de sources

Chapitres de livres sur le sujet "Twin basins"

1

Kohlgrüber, Klemens. « Basics – Screw Elements ». Dans Co-Rotating Twin-Screw Extruders : Fundamentals, 101–88. München, Germany : Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.1007/978-1-56990-748-1_2.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

dos Santos, Carlos Henrique, et José Arnaldo Barra Montevechi. « Digital Twins Architecture ». Dans Digital Twins : Basics and Applications, 1–12. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_2.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Zhao, Yuhang, Zheyu Jiang, Liang Qiao, Jinkang Guo, Shanchen Pang et Zhihan Lv. « Agricultural Digital Twins ». Dans Digital Twins : Basics and Applications, 37–44. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_5.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Scheibmeir, Jim, et Yashwant Malaiya. « Social Media Perspectives on Digital Twins and the Digital Twins Maturity Model ». Dans Digital Twins : Basics and Applications, 73–99. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_8.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
5

Zhang, Li, Wei Zhou et Xiaoqi Chen. « Digital Twins and Additive Manufacturing ». Dans Digital Twins : Basics and Applications, 27–35. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_4.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Sahal, Radhya, Saeed H. Alsamhi et Kenneth N. Brown. « Digital Twins Collaboration in Industrial Manufacturing ». Dans Digital Twins : Basics and Applications, 59–72. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_7.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
7

Wilke, Daniel N. « Digital Twins for Physical Asset Lifecycle Management ». Dans Digital Twins : Basics and Applications, 13–26. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_3.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
8

Kuzmichev, Victor, et Jiaqi Yan. « The Application of Digital Twins in the Field of Fashion ». Dans Digital Twins : Basics and Applications, 45–57. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11401-4_6.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
9

Wu, Jiaming, Linfabao Dai, Guangqiao Xue et Jian Chen. « Theory and Technology of Digital Twin Model for Geotechnical Engineering ». Dans Lecture Notes in Civil Engineering, 403–11. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_37.

Texte intégral
Résumé :
AbstractAs an innovative information technology, Digital Twin has greatly promoted the development of intelligent manufacturing in the industry. However, in the field of geotechnical engineering, there are still few researches on this aspect, which is still a “new territory” and “no man's land”. The concept of digital twin coincides with the needs of geotechnical engineering informatization, so the introduction of digital twin technology into the field of geotechnical engineering will help to promote the development process of geotechnical engineering informatization and digitization. This paper puts forward and defines the digital twin model of geotechnical engineering, describes the connotation of the digital twin model, and studies the architecture of the digital twin model of geotechnical engineering. On this basis, the integration and sharing mechanism of geotechnical engineering digital twin data based on BIM technology is proposed. In order to break through the defect that the geotechnical engineering information model has not fully played its role for a long time, an integrated model of geological body and structural body is constructed based on the construction and integration module of geotechnical digital twin model. Furthermore, the geotechnical engineering digital twin simulation analysis module is developed to initially form the geotechnical engineering digital twin model, so as to realize the geotechnical engineering digital design, collaborative construction, visual decision-making and transparent management.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Estrada-González, Luis. « The Evil Twin : The Basics of Complement-Toposes ». Dans Springer Proceedings in Mathematics & ; Statistics, 375–425. New Delhi : Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2719-9_18.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Twin basins"

1

Dreković, Edisa, Isak Karabegović et Nikola Stojić. « Digital Twin : Background, Challenges, Enabling Technologies, Benefits, and Use Case in the Elevator Industry ». Dans BASIC TECHNOLOGIES AND MODELS FOR IMPLEMENTATION OF INDUSTRY 4.0. Academy of Sciences and Arts of Bosnia and Herzegovina, 2023. http://dx.doi.org/10.5644/pi2023.209.12.

Texte intégral
Résumé :
Digital twins represent a new paradigm that brings fundamental changes to business and asset management. The proliferation of connected devices and sensors has generated vast amounts of data from physical assets and processes. Digital twins leverage this data to create a virtual counterpart that reflects the behavior, performance, and characteristics of their physical counterparts in real-time. The definition of digital twins encompasses a wide range of applications and contexts. This paper provides an overview of existing literature on digital twins, including their definition, key characteristics, and classification. Additionally, it highlights potential challenges and limitations associated with digital twins and identifies the technologies that enable their implementation. By understanding the fundamental concepts and technological advancements in the field of digital twins, organizations can harness their potential to enhance their business, optimize resources, and foster innovation. Numerous examples of digital twin applications in various industries are highlighted in this paper, with a particular focus on the elevator industry. Therefore, this paper serves as a comprehensive source of information for researchers, practitioners, and decision-makers who wish to explore the application of digital twins in different industries and domains.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Stadtmann, Florian, Henrik Andreas Gusdal Wassertheurer et Adil Rasheed. « Demonstration of a Standalone, Descriptive, and Predictive Digital Twin of a Floating Offshore Wind Turbine ». Dans ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-103112.

Texte intégral
Résumé :
Abstract Digital Twins bring several benefits for planning, operation, and maintenance of remote offshore assets. In this work, we explain the digital twin concept and the capability level scale in the context of wind energy. Furthermore, we demonstrate a standalone digital twin, a descriptive digital twin, and a prescriptive digital twin of an operational floating offshore wind turbine. The standalone digital twin consists of the virtual representation of the wind turbine and its operating environment. While at this level the digital twin does not evolve with the physical turbine, it can be used during the planning-, design-, and construction phases. At the next level, the descriptive digital twin is built upon the standalone digital twin by enhancing the latter with real data from the turbine. All the data is visualized in virtual reality for informed decision-making. Besides being used for data bundling and visualization, the descriptive digital twin forms the basis for diagnostic, predictive, prescriptive, and autonomous tools. A predictive digital twin is created through the use of weather forecasts, neural networks, and transfer learning. Finally, digital twin technology is discussed in a much wider context of ocean engineering.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Jegorov, Sergei, Anton Rassõlkin, Viktor Rjabtšikov, Mahmoud Ibrahim et Vladimir Kuts. « Novel Digital Twin Concept for Industrial Application. Study Case : Propulsion Drive System ». Dans ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-97243.

Texte intégral
Résumé :
Abstract This paper introduces a novel concept of interconnecting components of Digital Twins using ROS2 and micro-ROS frameworks. Authors of the research argue that middleware implementation plays the most important role in the performance of Digital Twins and its robustness must be ensured for reliable real-time operation between components of Digital Twins. Propulsion Drive System Digital Twin is presented where a permanent magnet synchronous motor testbench is interconnected with a virtual counterpart based on the motor’s analytical model for calculation of the motor’s angular velocity and torque. The interface between the motor of the Propulsion Drive System and its virtual counterpart is implemented on a basis of a microcontroller running micro-ROS, with ROS2 acting as a fundamental middleware. The suggested method of connecting components of Digital Twins is tested through a round-trip time latency test. Results of the latency test indicate that the proposed concept is suitable for Digital Twin technologies in industrial applications. At the end of the paper, the authors discuss possible future developments and use cases of the suggested concept.
Styles APA, Harvard, Vancouver, ISO, etc.
4

Plesker, Christian, Vladimir Kutscher, David Bassauer et Reiner Anderl. « Configuration of a Web-Based Digital Twin using a Modular and Flexible Simulation Chain ». Dans 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001614.

Texte intégral
Résumé :
The versatile concept of the digital twin is being applied in various economic sectors. To exploit its full potential, the digital twin has to be adaptable to changing requirements. In this paper we address the configuration of digital twins with a focus on a flexible and modular simulation chain. Thereby, we utilize the Functional Mock-Up Interface to enable variable configurations based on basic simulation components. We validate the concept by a prototypical implementation.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Ulmer, Jessica, Youssef Mostafa et Jörg Wollert. « Digital Twin Academy ». Dans 18. AALE-Konferenz. Hochschule für Technik, Wirtschaft und Kultur Leipzig, 2022. http://dx.doi.org/10.33968/2022.33.

Texte intégral
Résumé :
Digital twins are seen as one of the key technologies of Industry 4.0. Although many research groups focus on digital twins and create meaningful outputs, the technology has not yet reached a broad application in the industry. The main reasons for this imbalance are the complexity of the topic, the lack of specialists, and the unawareness of the twin opportunities. The project 'Digital Twin Academy' aims to overcome these barriers by focusing on three actions: Building a digital twin community for discussion and exchange, offering multi-stage training for various knowledge levels, and implementing realworld use cases for deeper insights and guidance. In this work, we focus on creating a flexible learning platform that allows the user to select a training path adjusted to personal knowledge and needs. Therefore, a mix of basic and advanced modules is created and expanded by individual feedback options. The usage of personas supports the selection of the appropriate modules.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Arnemann, Lars, et Benjamin Schleich. « Integrating Views of Digital Twins in the Strategic Planning of Cyber-Physical Products ». Dans 14th International Conference on Applied Human Factors and Ergonomics (AHFE 2023). AHFE International, 2023. http://dx.doi.org/10.54941/ahfe1003306.

Texte intégral
Résumé :
The digital twin is the virtual representation of the real product and provides the basis for cyber-physical products. Information about states as well as commands are stored in the digital twin. A multitude and variety of stakeholders can retrieve the states and execute the commands. Howev-er, the digital twin is not made available to these stakeholders in its entirety, but rather application- and user-specific rights are distributed to them. These application- and user-specific rights are un-derstood to be the views of digital twins. Taking these views into account in the early stages of product development has the potential to reduce costs, open up new markets and adapt end products to individual customer requirements with less effort. The concept developed in this paper integrates the views of digital twins into the early stages of development of cyber-physical products. A model for strategic product planning is implemented that fully takes into account the criteria of Industry 4.0 and the views of digital twins. In this phase of the product life cycle, the views of digital twins are defined and integrated. A newly developed persona model can be used to analyze and formalize both users, in this case stakeholders, and ap-plications, in this case smart services. The stakeholder model considers both the assignment of a group and a role, as well as the identification of tasks, problems and benefits, and PESTEL influenc-ing factors. The smart service model addresses on the one hand the tasks, problems and benefits of the stakeholders; on the other hand, states and commands can be recorded as well as hardware, software and infrastructure can be analyzed. A comparison of these two models with each other promises an optimal fit. It is thus possible to fulfill customer-specific wishes. The developed concept is validated with the help of a practical use case. In particular, the integra-tion of the views of digital twins is investigated. As a result of the investigation, the applicability and viability of the concept are demonstrated on the basis of a vacuum cleaning robot. In the outlook, future research potentials are identified and possible new solution approaches are presented.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Schlenger, J., T. Yeung, S. Vilgertshofer, J. Martinez, R. Sacks et A. Borrmann. « A Comprehensive Data Schema for Digital Twin Construction ». Dans The 29th EG-ICE International Workshop on Intelligent Computing in Engineering. EG-ICE, 2022. http://dx.doi.org/10.7146/aul.455.c194.

Texte intégral
Résumé :
Lean construction, originating from lean management, aims to proactively improve the overall efficiency of construction processes. This requires continuous assessment of performance to identify key problems, which allows continuous improvement of construction processes. Novel digital twin approaches form an excellent technological foundation for performance assessment through regular updates with product and process information directly from the construction site. While some publications favour a schema-less approach to digital twins, we argue that well-defined data structures are required to represent complex information reliably and transparently. Existing process and product models are inadequate with respect to the requirements of a digital twin of the construction phase. As a result, we introduce a new process-oriented model that provides an improved basis for advanced process evaluation in the digital twin environment. This data schema, which is the main outcome of this paper, is presented in UML format together with a first approach to transfer it to an ontology usable in the Semantic Web context.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Sidorov, I. A., R. O. Kostromin et A. G. Feoktistov. « System for monitoring parameters of functioning infrastructure objects and their external environment ». Dans The International Workshop on Information, Computation, and Control Systems for Distributed Environments. Crossref, 2020. http://dx.doi.org/10.47350/iccs-de.2020.23.

Texte intégral
Résumé :
The paper addresses relevant issues applying the concept of Industry 4.0 in related to modeling infrastructure objects at the Baikal natural territory that use environmentally friendly technologies. In particular, the use of heat pumps belongs to such technologies, since this enables us to reduce air emissions. Object models are designed on the basis of their digital twins. Digital twins are intended to reflect the structure and processes of object functioning. In addition, we plan to delegate them the decision-making in managing these objects in real-time. Such a digital twin has to become smarter over time. This virtual entity has to gain knowledge and skills to select optimal scenarios for controlling object and improving its functioning parameters. Therefore, the initial problem in its development is creating a monitoring system for the collection, unification, aggregation, storage, and transmission of subject-oriented data. Such data include information about the object operation and environmental state. The data must be promptly obtained from peripheral equipment (controlling and measuring devices). For the effective operation of a digital twin, we have to partially transfer functions of primary data processing, their intellectual analysis and decision-making to the controlling and measuring devices. To this end, we use agents that implement software on peripheral equipment.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Okhuijsen, Bob. « Combining the Process and Maintenance Digital Twin to Create an Autonomous Production Platform ». Dans Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31773-ms.

Texte intégral
Résumé :
Abstract In the next 5-10 years, it is to be expected that normally unmanned production platforms (and eventually autonomous platforms) with a single yearly maintenance intervention will become the norm. This paper describes the basis for achieving this objective by integrating digital twins for the Process and Asset Performance/Maintenance domains. The Process Twin described has been deployed in real-world field applications and provides the necessary level of reliability and accuracy to allow for closed-loop production optimization in real-time (i.e., optimized setpoints are pushed directly to the DCS or SCADA without manual verification or validation). The process model covers the entire production value chain, including reservoir, wells, risers, process facilities, sale of product, etc. Multiple constraints can be entered into the optimization engine, giving operators the ability to define a bespoke landscape for their optimization based on several key performance indicators (KPIs) related to production, process, economic, and environmental requirements. The Asset Performance Twin complements the Process Twin by continuously generating the remaining Useful Life (RUL) of equipment. In the event that RUL does not match the timing of the next planned maintenance campaign, an alternative operational scenario can be calculated to extend the RUL. The Process Twin then optimizes production around this new constraint, with the ultimate objective being to minimize unplanned downtime and associated manual interventions.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Okhuijsen, Bob. « Combining the Process and Maintenance Digital Twin to Create an Autonomous Production Platform ». Dans Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31773-ms.

Texte intégral
Résumé :
Abstract In the next 5-10 years, it is to be expected that normally unmanned production platforms (and eventually autonomous platforms) with a single yearly maintenance intervention will become the norm. This paper describes the basis for achieving this objective by integrating digital twins for the Process and Asset Performance/Maintenance domains. The Process Twin described has been deployed in real-world field applications and provides the necessary level of reliability and accuracy to allow for closed-loop production optimization in real-time (i.e., optimized setpoints are pushed directly to the DCS or SCADA without manual verification or validation). The process model covers the entire production value chain, including reservoir, wells, risers, process facilities, sale of product, etc. Multiple constraints can be entered into the optimization engine, giving operators the ability to define a bespoke landscape for their optimization based on several key performance indicators (KPIs) related to production, process, economic, and environmental requirements. The Asset Performance Twin complements the Process Twin by continuously generating the remaining Useful Life (RUL) of equipment. In the event that RUL does not match the timing of the next planned maintenance campaign, an alternative operational scenario can be calculated to extend the RUL. The Process Twin then optimizes production around this new constraint, with the ultimate objective being to minimize unplanned downtime and associated manual interventions.
Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Twin basins"

1

Kerr, D. E. Reconnaissance surficial geology, Nose Lake, Nunavut-Northwest Territories, NTS 76-F. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329666.

Texte intégral
Résumé :
The oldest regional ice flow in the Nose Lake map area is southwestward. Subsequent northwestward flow is inferred from streamlined bedrock in central and eastern regions. The final and youngest flow was southwestward in these same regions, recorded by an abundance of streamlined landforms in till blanket and bedrock. The western edge of this late active ice lobe is defined by recessional moraines, part of the Twin Jugs moraine, also marking the eastern limit of a broad band of hummocky till from downwasting ice. During deglaciation, short-lived proglacial lakes, identified by raised beaches and deltas, developed within parts of the river valleys of the Mara (420 to 410 m elevation), Hackett (445 to 395 m), and Storak (440 to 415 m). Lakes also formed west of Nose Lake (490 to 430 m elevation) and in the Contwoyto-Pellatt-Ghurka lake basins (470 to 450 m). Orientation of many eskers, associated subglacial meltwater corridors, and sheet drainage is variable, but can be perpendicular to local ice flow.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Horsey, Ry, Andrew Parker, Chris CaraDonna, Matthew Dahlhausen, Lauren Klun, Amy LeBar et Marlena Praprost. Understanding Building Energy Use in Boise-Twin Falls : Basic Building Stock Characterization. Office of Scientific and Technical Information (OSTI), août 2023. http://dx.doi.org/10.2172/1998651.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
3

Holterman, H. J., D. C. de Hoog et J. C. van de Zande. Onderzoek aan spuitdoppen uit de reeks Albuz CVI 110 en CVI Twin 110 voor classificatie op basis van driftgevoeligheid. Wageningen : Stichting Wageningen Research, Wageningen Plant Research, Business unit Agrosysteemkunde, 2022. http://dx.doi.org/10.18174/569185.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
4

Lafrancois, Toben, Mark Hove et Jay Glase. Zebra mussel (Dreissena polymorpha) distribution in Apostle Islands National Lakeshore : SCUBA-based search and removal efforts : 2019–2020. National Park Service, mai 2022. http://dx.doi.org/10.36967/nrr-2293376.

Texte intégral
Résumé :
Invasive zebra mussels (Dreissena polymorpha) were first observed in situ at Apostle Islands National Lakeshore (APIS) in 2015. This report builds on 2018 SCUBA surveys and Environmental Protection Agency (EPA) veliger sampling to: 1) determine whether shoals on APIS borders act as sentinel sites to corroborate veliger drift hypotheses about invasion pathways, 2) evaluate ongoing hand-removal of zebra mussels from easily identified structures, and 3) continue efforts to assess native unionid mussel populations, particularly where zebra mussels are also present. Standard catch per unit effort survey methods by SCUBA teams were used to determine the distribution and relative abundance of zebra or quagga mussels (dreissenids) and native mussels (unionids). Zebra mussels were present at densities between 3 and 42 n/diver/hr (number of mussels per diver per hour), while native unionids were present at densities between 5 and 72 n/diver/hr. Shoal surveys (Eagle Island shoal, Sand Island shoal, York Island shoal, Bear Island shoal, Oak Island shoal, and Gull Island shoal) showed zebra mussels were more abundant on the west side of APIS and absent on the easternmost shoal (Gull Island), corroborating veliger work by the EPA that suggested drift from the Twin Ports of Duluth, Minnesota, and Superior, Wisconsin, is one pathway of invasion. Our results support the use of shallow shoals along the periphery of the park as sentinel sites gauging zebra mussel immigration and population dynamics. Zebra mussel densities in the central islands showed no obvious spatial pattern, and this survey cannot determine whether currents or human transport (or both) are invasion vectors. Given the mussels’ continued presence at heavily used mooring areas and docks where there are no zebra mussels on nearby natural features (e.g., Rocky Island dock, Stockton Island mooring areas), our findings are consistent with multiple invasion pathways (drift from the Twin Ports and anthropogenic sources at mooring areas). SCUBA search and removal of zebra mussels from docks was confirmed to be an effective method for significantly lowering the risk of zebra mussels reproducing and dispersing from these locations. We caution that this work is being done on what look like initial invasions at low densities. Repeated removal of zebra mussels by divers reduced numbers to zero at some sites after one year (South Twin docks, Stockton Island NPS docks, and the Ottawa wreck) or decreased numbers by an order of magnitude (Rocky Island docks). Dreissenid densities were more persistent on the Sevona wreck and longer-term work is required to evaluate removal versus recruitment (local and/or veliger drift). Given the size of the wreck, we have tracked detailed survey maps to guide future efforts. Zebra mussels were again observed attached to native mussels near Stockton Island and South Twin Island. Their continued presence on sensitive native species is of concern. Native unionid mussels were more widely distributed in the park than previously known, with new beds found near Oak and Basswood Islands. The work reported here will form the basis for continued efforts to determine the optimal frequency of zebra mussel removal for effective control, as well as evaluate impacts on native species.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Yarie, John, et Bert R. Mead. Twig and foliar biomass estimation equations for major plant species in the Tanana River Basin of interior Alaska. Portland, OR : U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1988. http://dx.doi.org/10.2737/pnw-rp-401.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Guha, Supratik, H. S. Philip Wong, Jean Anne Incorvia et Srabanti Chowdhury. Future Directions Workshop : Materials, Processes, and R&D Challenges in Microelectronics. Defense Technical Information Center, juin 2022. http://dx.doi.org/10.21236/ad1188476.

Texte intégral
Résumé :
Microelectronics is a complex field with ever-evolving technologies and business needs, fueled by decades of continued fundamental materials science and engineering advancement. Decades of dimensional scaling have led to the point where even the name microelectronics inadequately describes the field, as most modern devices operate on the nanometer scale. As we reach physical limits and seek more efficient ways for computing, research in new materials may offer alternative design approaches that involve much more than electron transport e.g. photonics, spintronics, topological materials, and a variety of exotic quasi-particles. New engineering processes and capabilities offer the means to take advantage of new materials designs e.g. 3D integration, atomic scale fabrication processes and metrologies, digital twins for semiconductor processes and microarchitectures. The wide range of potential technological approaches provides both opportunities and challenges. The Materials, Processes, and R and D Challenges in Microelectronics Future Directions workshop was held June 23-24, 2022, at the Basic Research Innovation Collaboration Center in Arlington, VA, to examine these opportunities and challenges. Sponsored by the Basic Research Directorate of the Office of the Under Secretary of Defense for Research and Engineering, it is intended as a resource for the S and T community including the broader federal funding community, federal laboratories, domestic industrial base, and academia.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Bazer, Fuller W., Arieh Gertler et Elisha Gootwine. Role of Placental Lactogen in Sheep. United States Department of Agriculture, janvier 2001. http://dx.doi.org/10.32747/2001.7574339.bard.

Texte intégral
Résumé :
Central problems in sheep and dairy cattle production are reproductive failure due to embryonic/fetal mortality and low birth weights, especially in prolific breeds, and reduced milk yields which adversely affect neonatal survival and economy of production. The sheep placenta expresses lactogenic (ovine placental lactogen, oPL) and somatogenic (ovine placental growth hormone, oGH) hormones. Our research has focused on the biological roles of oPL and oGH in function of the uterine endometrium during gestation and the mammary gland during pregnancy and lactation. Major conclusions were that: ( 1 ) immunization of prepubertal ewes against oPL resulted in increased birth weights of their lambs and their milk production during lactation; (2) neither oPL nor oGH had an antiluteolytic effect on uterine endometrium to affect lifespan of the corpus luteum; (3) only sequential exposure of the progesterone stimulated uterus to oIFNt and oPL or oGH increased endometrial gland proliferation and secretory protein gene expression; (4) oPL signals through a homodimer of ovine prolactin receptor (PRL-R) and heterodimer of oPRL-R and growth hormone receptor (GH-R); (5) exogenous recombinant oPL and oGH stimulated mammogenesis and milk yield during lactation; and (6) mutation of oPL and oGH was used to define specific biological effects and a rational basis for design of a specific receptor agonists or antagonists. This project was very productive in elucidating basic biological effects of oPL and oGH on intracellular signal transduction pathways, uterine development and secretory function, as well as mammogenesis and lactogenesis. We determined that immunization of prepubertal ewes against roPL increased birth weights of their lambs, especially those born as twins and triplets, as well as enhanced lactational performance. These studies significantly extended our knowledge of uterine and fetal-placental physiology and provided a foundation for new strategies to enhance reproductive and lactation efficiency. Based on these results, the major achievements were: 1) creation of a practical and cost effective management tool for producers to increase reproductive performance, neonatal survival, and milk yield of ewes in commercial flocks; and 2) define, for the first time, biological effects of oPL on endometrial functions and gene expression by uterine gland epithelium.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Water-quality assessment of part of the upper Mississippi River basin, Minnesota and Wisconsin - Ground-water quality in an urban part of the Twin Cities Metropolitan area, Minnesota, 1996. US Geological Survey, 1998. http://dx.doi.org/10.3133/wri974248.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
Vous pouvez également être intéressé par les bibliographies sur le sujet « Twin basins » pour d’autres types de sources :
Articles de revues Livres
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie