Browsing Department of Mathematics by Issue Date
Now showing items 41-60 of 931
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Ulrich bundles on a general blow-up of the plane
(Journal article; Peer reviewed, 2023)We prove that on X n , the plane blown-up at n very general points, there are Ulrich line bundles with respect to a line bundle corresponding to curves of degree m passing simply through the n blown-up points, with m ≤ 2√n ... -
Irreducible unirational and uniruled components of moduli spaces of polarized Enriques surfaces
(Journal article; Peer reviewed, 2023)We prove that infinitely many irreducible components of the moduli space of polarized Enriques surfaces are unirational (resp. uniruled), characterizing them in terms of decompo- sitions of the polarization as an effective ... -
Nonemptiness of severi varieties on enriques surfaces
(Journal article; Peer reviewed, 2023)Let (S,L) be a general polarised Enriques surface, with L not numerically 2-divisible. We prove the existence of regular components of all Severi varieties of irreducible nodal curves in the linear system |L| , that is, ... -
Addressing class imbalance in deep learning for acoustic target classification
(Journal article; Peer reviewed, 2023)Acoustic surveys provide important data for fisheries management. During the surveys, ship-mounted echo sounders send acoustic signals into the water and measure the strength of the reflection, so-called backscatter. ... -
Cellular and environmental dynamics influence species-specific extents of organelle gene retention
(Journal article; Peer reviewed, 2023)Mitochondria and plastids rely on many nuclear-encoded genes, but retain small subsets of the genes they need to function in their own organelle DNA (oDNA). Different species retain different numbers of oDNA genes, and the ... -
Perfusion estimation using synthetic MRI-based measurements and a porous media flow model
(Journal article; Peer reviewed, 2023)The measurement of perfusion and filtration of blood in biological tissue give rise to important clinical parameters used in diagnosis, follow-up, and therapy. In this paper, we address techniques for perfusion analysis ... -
Local Gaussian Cross-Spectrum Analysis
(Journal article; Peer reviewed, 2023)The ordinary spectrum is restricted in its applications, since it is based on the second-order moments (auto- and cross-covariances). Alternative approaches to spectrum analysis have been investigated based on other measures ... -
MRI-based radiomic signatures for pretreatment prognostication in cervical cancer
(Journal article; Peer reviewed, 2023)Background Accurate pretherapeutic prognostication is important for tailoring treatment in cervical cancer (CC). Purpose To investigate whether pretreatment MRI-based radiomic signatures predict disease-specific ... -
On coupled envelope evolution equations in the Hamiltonian theory of nonlinear surface gravity waves
(Journal article; Peer reviewed, 2023)This paper presents a novel theoretical framework in the Hamiltonian theory of nonlinear surface gravity waves. The envelope of surface elevation and the velocity potential on the free water surface are introduced in the ... -
The influence of directional spreading on rogue waves triggered by abrupt depth transitions
(Journal article; Peer reviewed, 2023)An increased number of rogue waves, relative to standard distributions, can be induced by unidirectional waves passing over abrupt decreases in water depth. We investigate this phenomenon in a more general setting of ... -
Coupled effects of wave and depth-dependent current interaction on loads on a bottom-fixed vertical slender cylinder
(Journal article; Peer reviewed, 2023)The coupled effects of waves and a subsurface current on the hydrodynamic loads on offshore slender structures in coastal water regions have been examined in this paper, especially the coupling of the weak nonlinearity of ... -
On the formation of coastal rogue waves in water of variable depth
(Journal article; Peer reviewed, 2023)Wave transformation is an intrinsic dynamic process in coastal areas. An essential part of this process is the variation of water depth, which plays a dominant role in the propagation features of water waves, including a ... -
Avoiding misleading estimates using mtDNA heteroplasmy statistics to study bottleneck size and selection
(Journal article; Peer reviewed, 2023)Mitochondrial DNA heteroplasmy samples can shed light on vital developmental and genetic processes shaping mitochondrial DNA populations. The sample means and sample variance of a set of heteroplasmy observations are ... -
A TMB Approach to Study Spatial Variation in Weather-Generated Claims in Insurance
(Journal article; Peer reviewed, 2023)In this paper, we use TMB to study spatial variation in weather-generated claims in insurance. Our motivation is twofold. By comparing with INLA, we first find that TMB is a robust and efficient approach to deal with spatial ... -
Tinnitus Is Marginally Associated with Body Mass Index, Heart Rate and Arterial Blood Pressure: Results from a Large Clinical Sample
(Journal article; Peer reviewed, 2023)Introduction: This study aimed to explore whether body mass index (BMI), systolic blood pressure (RR syst), diastolic blood pressure (RR diast) or heart rate (HR) are associated with tinnitus status and/or severity. Methods: ... -
Effects of complex neck therapy – kinesiotherapy and interspinal muscles massage – on tinnitus
(Journal article, 2023)Introduction: Past studies have shown connections between the somatosensory system (the neck and temporomandibular joint region) and the auditory system. It is therefore likely that tinnitus patients might benefit from ... -
Data science approaches provide a roadmap to understanding the role of abscisic acid in defence
(Journal article; Peer reviewed, 2023)Abscisic acid (ABA) is a plant hormone well known to regulate abiotic stress responses. ABA is also recognised for its role in biotic defence, but there is currently a lack of consensus on whether it plays a positive or ... -
Stromule Geometry Allows Optimal Spatial Regulation of Organelle Interactions in the Quasi-2D Cytoplasm
(Journal article; Peer reviewed, 2023)In plant cells, plastids form elongated extensions called stromules, the regulation and purposes of which remain unclear. Here, we quantitatively explore how different stromule structures serve to enhance the ability of a ... -
Crustal Conditions Favoring Convective Downward Migration of Fractures in Deep Hydrothermal Systems
(Journal article; Peer reviewed, 2023)Cooling magma plutons and intrusions are the heat sources for hydrothermal systems in volcanic settings. To explain system longevity and observed heat transfer at rates higher than those explained by pure conduction, the ... -
An isenthalpic formulation for simulating geothermal systems with phase changes
(Conference object; Peer reviewed, 2023)We propose a unified isenthalpic formulation for the equilibrium problem of compositional multiphase mixtures. To solve the equilibrium problem numerically, we used an interior point method with line search and present an ...