Research works

Scaling limit of a drainage network model on a perturbed lattice

Abstract The study of random networks generally requires that vertices be independently and uniformly distributed over disjoint regions such as a Poisson point process. In this work, we venture beyond this standard paradigm and investigate a stochastic forest obtained from a drai...

The Photospheric Imprints of Coronal Electric Currents. I. Magnetic Structure near Polarity Inversion Lines

Abstract Flares and coronal mass ejections (CMEs) are powered by magnetic energy stored in coronal electric currents. Here, we use photospheric vector magnetic field observations to study currents in active regions 10930 and 11158, which both produced eruptive, X-class flares. We...

On the image of the Hilbert map

Abstract We talk about the image of the Hilbert map. In particular, we show the necessary and sufficient condition for the Hilbert map to be surjective.

AIRFOIL DESIGN OPTIMIZATION USING MULTI FIDELITY AT LOW REYNOLDS NUMBER FOR FIXED WING UAV

A methodology is given to choose an airfoil for a fixed wing UAV, and evaluate based on the mission constraints, and to efficiently optimize the airfoil by using multi-fidelity software such as XFLR5 and ANSYS FLUENT. The analysis solvers are validated for the wind tunnel test da...

Functionality for isomorphism classes of curves and hypersurfaces

We describe algorithms based on invariant theory to solve problems on the geometry of curves, mainly those of genus 2, 3 and 4. New theoretical results building on the first author's PhD thesis are also included.

Uniform unlikely intersections for unicritical polynomials

Fix $d\geq2$, and consider the family $f_{t}(z)=z^{d}+t$ of polynomials parameterized by $t\in\mathbb{C}$. In this article, we will show that there exists a constant $C(d)$ such that for any $a,b\in\mathbb{C}$ with $a^{d}\neq b^{d}$, the number of $t\in\mathbb{C}$ such that $a$ a...

Studies of Magneto-Optically and Magnetostatically Trapped Cesium in a Cryogenic Vacuum Apparatus

The use of a cryogenic apparatus has several advantages for the magneto-optical and magnetostatic trapping of atoms. We have measured the lifetimes of magneto-optical and magnetostatic traps for cesium to be greatly increased in a cryogenic vacuum environment relative to a room-t...

Interaction Potentials of Atom-Molecule and Molecule-Molecule Systems from Crossed Beam Experiments

The text of this thesis is comprised of eight chapters and six appendices. The first chapter is an introduction, overviewing the purpose of the experiments and outlining the remainder of the thesis. Chapters 2 and 3 survey the theory of intermolecular potentials and of elastic sc...

Semi-analytic subsidence prediction

Subsidence of the surface due to the extraction of gas or oil from hydrocarbon reservoirs can in some cases be considerable. Two places where this is a problem are the Groningen field in The Netherlands and the Ekofisk field offshore Norway. Two approaches have traditionally been...

Turing Pattern Formation in the Chlorine Dioxide-Iodine-Malonic Acid Reaction-Diffusion System

The formation of localized structures in the chlorine dioxide-idodine-malonic acid (CDIMA) reaction-diffusion system is investigated numerically using a realistic model of this system. We analyze the one-dimensional patterns formed along the gradients imposed by boundary feeds, a...

Recreational sport activities: Psychological well-being of children in Government and Private Schools

We all know that psychological well-being is not possible without physical well-being, both aspects are interrelated. Recreational sport activity is crucial to health, fitness and well-being. It builds strength, maintains mobility, and challenges body and mind. Thus, the present...

Emissions at different conditions of traffic flow

Although it is widely assumed that congestion causes an increase in exhaust gas emissions, it has always been difficult to quanti~ this relatiomhip. The project Emissions and Congestion investigated this relationship by simultaneously measuring traffic conditions and emissions. E...

Efficacy of some novel insecticide against maize stem borer, Chilo partellus (Swinhoe) in maize

A field experiment was carried out to study the efficacy of some novel insecticide against maize stem borer, Chilo partellus (Swinhoe) at Crop Research Centre of SardarVallabhbhai Patel University of Agriculture and Technology, Meerut during Kharif 2016. The imidacloprid 17.8 SL...

Buried fragments reveal a “Greater Gondwana” supercontinent

Profound global biogeochemical shifts marked the Ediacaran-Cambrian transition [550–500 million years (Ma)], a phenomenon often ascribed to the dynamics of supercontinent cycles. However, Gondwana is frequently denied supercontinent status due to its perceived spatial deficit (∼6...

Functional neurological disorders: misunderstanding “Dualism”

Psychological and psychiatric explanations for Functional Neurological Disorders (FND) are routinely dismissed as embodying "dualism" or "mind-body dualism", strongly implying that any notion of psychogenicity should be rejected outright. This reflects a widespread misunderstandi...

Oxygen vs Air at Birth for Moderate- to Late-Preterm Infants

Importance The optimal initial fraction of inspired oxygen (F io 2 ) for delivery room resuscitation of neonates born at 32 to 35 weeks’ gestation is unknown. Objective To compare outcomes for neonates born at 32 to 35 weeks’ gestation when initiating resuscitation with F io 2 0....

Morphological and Molecular Characterization of Psychrobacter cryohalolentis Isolated from Chestnut Soils in Türkiye

Abstract Psychrobacter cryohalolentis was first isolated from Siberian permafrost in 2006, with the type strain being K5. It is an important species because it is both halotolerant and psychrotolerant. This study describes and characterizes P. cryohalolentis, isolated from the so...

Betel nut sucking is the earliest recorded evidence for the habitual use of a neuroactive plant drug

The modern custom of chewing betel nuts is practiced by around 1 in 10 people worldwide, yet the earliest beginnings of this widespread drug use habit are unknown. We report rare skeletal remains of two preagricultural foragers from Sulawesi (Indonesia), both displaying a dental...

SORDINO: silent, sensitive, specific and artifact-resistant fMRI in awake, behaving mice

Blood-oxygenation-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) has advanced brain mapping across species. This widely used technique, however, faces challenges such as acoustic noise, electromagnetic interference, motion artifacts, magnetic-field inhomogene...

Optimal control of spiral waves in heterogeneous excitable media: non-monotonic efficacy of localized optogenetic inhibition

Structural heterogeneity stabilizes spiral waves in excitable media, yet how its spatial architecture, ranging from diffuse interstitial deposition to focal scar patterns, modulates the efficacy of localized optogenetic control remains poorly understood. Using a two-dimensional c...