Relevant bibliographies by topics / Fibred threefold

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Fibred threefold'

Author: Grafiati
Published: 9 March 2023
Last updated: 31 July 2025

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Journal articles on the topic "Fibred threefold"

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Thompson, Alan. "Explicit Models for Threefolds Fibred by K3 Surfaces of Degree Two." Canadian Journal of Mathematics 65, no. 4 (2013): 905–26. http://dx.doi.org/10.4153/cjm-2012-037-2.

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AbstractWe consider threefolds that admit a fibration by K3 surfaces over a nonsingular curve, equipped with a divisorial sheaf that defines a polarization of degree two on the general fibre. Under certain assumptions on the threefold we show that its relative log canonical model exists and can be explicitly reconstructed from a small set of data determined by the original fibration. Finally, we prove a converse to this statement: under certain assumptions, any such set of data determines a threefold that arises as the relative log canonical model of a threefold admitting a fibration by K3 sur
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XU, JINSONG. "The third and fourth pluricanonical maps of threefolds of general type." Mathematical Proceedings of the Cambridge Philosophical Society 157, no. 2 (2014): 209–20. http://dx.doi.org/10.1017/s0305004114000267.

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AbstractFor a nonsingular projective threefold of general typeXover the field of complex numbers, we show that the fourth pluricanonical map ϕ4is not birational onto its image if and only ifXis birationally fibred by (1,2)-surfaces, provided that vol(X) ≥ 303. We also have similar characterization of birationality of ϕ3.
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Bera, Swagata, Dibya Chakraborty, George K. Leontaris, and Pramod Shukla. "Inflating in perturbative LVS: global embedding and robustness." Journal of Cosmology and Astroparticle Physics 2024, no. 09 (2024): 004. http://dx.doi.org/10.1088/1475-7516/2024/09/004.

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Abstract The perturbative LARGE volume scenario (LVS) is a promising moduli stabilisation scheme in which the overall volume modulus of the compactifying Calabi-Yau (CY) threefold is dynamically stabilised to exponentially large values via using only perturbative corrections. In this article, using an orientifold of a K3-fibred CY threefold, we present the global embedding of an inflationary model proposed in the framework of perturbative LVS, in which the overall volume modulus acts as the inflaton field rolling on a nearly flat potential induced by a combination of the α '3-corrections and t
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HUNT, BRUCE. "K3-FIBERED CALABI–YAU THREEFOLDS II: SINGULAR FIBERS." International Journal of Mathematics 10, no. 07 (1999): 871–96. http://dx.doi.org/10.1142/s0129167x99000379.

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Duneau, Michel, and Marc Audier. "Quasiperiodic packings of fibres with icosahedral symmetry." Acta Crystallographica Section A Foundations of Crystallography 55, no. 4 (1999): 746–54. http://dx.doi.org/10.1107/s0108767399001142.

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Different icosahedral packings of fibres have been experimentally realized. A packing construction with straight fibres of the same circular cross section, only parallel to fivefold icosahedral axes and respecting the closest packing condition, is reported. Its characteristics of point-group symmetry and related two-dimensional tilings are analysed. But for determining unambiguously all the fibre positions it appears that a mathematical construction has to be made from the cut and projection of a five-dimensional space. Through such a method, the volume fraction of fibrous reinforcement in a c
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Colliot-Thélène, Jean-Louis, and Bruno Kahn. "Cycles de codimension 2 et H3 non ramifié pour les variétés sur les corps finis." Journal of K-Theory 11, no. 1 (2013): 1–53. http://dx.doi.org/10.1017/is012009001jkt194.

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AbstractLet X be a smooth projective variety over a finite field $\mathbb{F}$. We discuss the unramified cohomology group H3nr(X, ℚ/ℤ(2)). Several conjectures put together imply that this group is finite. For certain classes of threefolds, H3nr(X, ℚ/ℤ(2)) actually vanishes. It is an open question whether this holds for arbitrary threefolds. For a threefold X equipped with a fibration onto a curve C, the generic fibre of which is a smooth projective surface V over the global field $\mathbb{F}$(C), the vanishing of H3nr(X, ℚ/ℤ(2)) together with the Tate conjecture for divisors on X implies a loc
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ANDREAS, BJÖRN, GOTTFRIED CURIO, and ALBRECHT KLEMM. "TOWARDS THE STANDARD MODEL SPECTRUM FROM ELLIPTIC CALABI–YAU MANIFOLDS." International Journal of Modern Physics A 19, no. 12 (2004): 1987–2014. http://dx.doi.org/10.1142/s0217751x04018087.

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We show that it is possible to construct supersymmetric three-generation models with the Standard Model gauge group in the framework of non-simply-connected elliptically fibered Calabi–Yau threefolds, without section but with a bi-section. The fibrations on a cover Calabi–Yau threefold, where the model has six generations of SU(5) and the bundle is given via the spectral cover description, use a different description of the elliptic fiber which leads to more than one global section. We present two examples of a possible cover Calabi–Yau threefold with a free involution: one is a fiber product
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BARJA, MIGUEL A. "LOWER BOUNDS OF THE SLOPE OF FIBRED THREEFOLDS." International Journal of Mathematics 11, no. 04 (2000): 461–91. http://dx.doi.org/10.1142/s0129167x00000234.

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We study from a geographical point of view fibrations of threefolds over smooth curves f:T→B such that the general fibre is of general type. We prove the non-negativity of certain relative invariants under general hypotheses and give lower bounds for [Formula: see text] depending on other relative invariants. We also study the influence of the relative irregularity q(T)-g(B) on these bounds. A more detailed study of the lowest cases of the bounds is given.
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Szendrői, Balázs. "Sheaves on Fibered Threefolds and Quiver Sheaves." Communications in Mathematical Physics 278, no. 3 (2008): 627–41. http://dx.doi.org/10.1007/s00220-007-0408-y.

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Oguiso, Keiji. "On certain rigid fibered Calabi-Yau threefolds." Mathematische Zeitschrift 221, no. 1 (1996): 437–48. http://dx.doi.org/10.1007/bf02622125.

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Dissertations / Theses on the topic "Fibred threefold"

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RIVA, ENEA. "Slope inequalities for fibred surfaces and fibreed threefolds." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/374266.

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Su una varieta algebrica fibrata si definesce un invariante relativo detto slope che ne specifica la natura. Per queste fibrazioni un ruolo importante è svolto del fibrato di Hodge e dagli invarianti geometrici delle fibre generiche. In particulare in questa tesi ci concentreremo su superfici e threefold fibrati su curve, dando un stima dal basso della slope che dipenda del rango unitario del fibrato di hodge e da: - indice di clifford cella curva generale, nel caso di superfici; -dal genere geometrico ($p_{g}$) della superficie generale nel caso di threefold. infine sfrutteremo i risultati ot
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Barja, Yáñez Miguel Ángel. "On the Slope and Geography of Fibred Surfaces and Threefolds." Doctoral thesis, Universitat de Barcelona, 1998. http://hdl.handle.net/10803/655.

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In this tesis we study numerical propieties of surfaces and threefolds, mainly fibred over curves, the so called "slope" of the fibration. We prove partially a conjecture of Fujita on the semiampleness of the direct image of the relative dualizing sheaf of a fibration.<br/>We give new lower bounds of the slope of a fibred surface depending on data of the general fibre (existence of involutions) and on data of the hole surface (the fibration not being the Albanese morphism, for example). <br/>We study the case of threefolds over curves. We prove that, in general, the relative algebraic Euler ch
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Thompson, Alan Matthew. "Models for threefolds fibred by K3 surfaces of degree two." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542980.

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Book chapters on the topic "Fibred threefold"

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"Fibre products of elliptic surfaces." In Modular Calabi-Yau Threefolds. American Mathematical Society, 2005. http://dx.doi.org/10.1090/fim/022/02.

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Conference papers on the topic "Fibred threefold"

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Zhang, Yani, Qiang Xu, Sicong Liu, and Ya Zhao. "Optimization of nearly zero ultra-flattened dispersion photonic crystal fibre with fluorine doped threefold symmetry core." In Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, edited by Yueguang Lv, Jialing Le, Hesheng Chen, Jianyu Wang, and Jianda Shao. SPIE, 2017. http://dx.doi.org/10.1117/12.2268376.

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Hartman, Richard R. "Mechanical Treatment of Pulp Fibers for Paper Property Development." In Papermaking Raw Materials, edited by V. Punton. Fundamental Research Committee (FRC), Manchester, 1985. http://dx.doi.org/10.15376/frc.1985.1.413.

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Some fundamental aspects of mechanical actions on wood pulp fibers have been studied. Specifically, the objectives of the study were to produce internal fibrillation in pulp fibers, evaluate its influence on paper properties, and establish its importance relative to external fibrillation and fines in terms of paper property development. An apparatus was constructed that subjected pulp fibers (in the form of a wet handsheet) to repeated compressive loading cycles. Pulp was also treated in an experimental apparatus designed to promote external fibrillation, and in a Valley beater. Several fiber
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Zeleny, R., and M. Lucki. "An improved non-linear nearly-zero dispersion flattened photonic crystal fiber with the threefold symmetry core." In SPIE Photonics Europe, edited by Kyriacos Kalli and Alexis Mendez. SPIE, 2012. http://dx.doi.org/10.1117/12.920064.

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Bergano, Neal S., Jennifer Aspell, C. R. Davidson, P. R. Trischitta, B. M. Nyman, and F. W. Kerfoot. "Bit-Error-Rate Measurements of a Multi-Thousand-Kilometer Fiber-Amplifier Transmission System Using a Circulating Loop." In Optical Amplifiers and Their Applications. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oaa.1991.tha5.

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Recently, we reported the results of a 2.4 Gb/s and 5 Gb/s feasibility demonstration of long distance erbium-doped fiber amplifier (EDFA) transmission systems using a circulating loop[1] The significance of this experiment was threefold. First, it demonstrated that high bit rate all-optical EDFA transmission systems are capable of achieving transoceanic distances. Second, it demonstrated a new measurement technique in which bit-error-rate (BER) is measured in a circulating loop. And, third, it achieved a new record in bit rate distance products.
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Khan, Abdul Muqtadir, Abdullah BinZiad, and Abdullah Alsubaii. "Digital Degradable Chemistry Provides Solutions for Production Enhancement and Intervention in Challenging Wells." In SPE International Hydraulic Fracturing Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215707-ms.

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Abstract Gas wells with high porosity and a low productivity index have mechanical and petrophysical properties that require fracture development to improve productivity. Fundamental solutions through treatment design have a lower impact than the characteristics of the reservoir and rock properties. Problems related to controlled fracture geometry, excessive fluid leakoff, proppant settling, proppant flowback, and near-wellbore and far-field diversion do not have promising solutions. Utilization of degradable chemistry, especially with ability of simulating the performance with advanced numeri
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Konka, Hari Prasad, M. A. Wahab, and Kun Lian. "Sandwich Structures With Smart Composite Face Skin." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62170.

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Sandwich structures are one of the very important classes of composite structures that have been studied quite extensively in the past few years. The concepts of sandwich structures have been widely used in the aerospace, automobile, marine, and civil engineering applications; because it is suitable and amenable to the development of light-weight structures with high in-plane and flexural stiffness. A typical sandwich structure is usually comprised of two stiff face skins, which are separated by a thick, lightweight, and compliant core. The primary function of the face skin sheets in a sandwic
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Moganaradjou, Yashwant, Ganesh Arunkumar Samdani, Mauricio A. Almeida, Mahendra K. Kunju, and Vishwas Paul Gupta. "Field Scale Tests & Modeling to Forecast Gas Migration Rates for Pressurized Mud Cap Drilling (PMCD) Applications." In IADC/SPE International Drilling Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/217703-ms.

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Abstract Understanding gas migration rates is a critical part of well control discipline; for PMCD significant discrepancies exist between field observations of gas migration rates and common industry estimation methods (e.g. SPE212546). The objective of this work was to study realistic field scale scenarios in a test well and develop a predictive model using the data. The model helps in simulating field scenarios and efficient planning of fluid logistics with significant economic impact. We present an industry first well scale study that demonstrates the impact of flow regime and solubility u
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