Quantum states on spheres in the presence of magnetic fields

The study of quantum states on the surface of various two-dimensional geometries in the presence of strong magnetic fields has proven vital to the theoretical understanding of the quantum Hall effect. In particular, Haldane’s seminal study of quantum states on the surface of a compact geometry, the sphere, in the presence of a monopole magnetic field, was key to developing an early understanding of the fractional quantum Hall effect. Most of the numerous studies undertaken of similar systems since then have been limited to cases in which the magnetic fields are everywhere constant and perpendicular to the surface on which the charged particles are confined. In this thesis, we study two novel variations of Haldane’s spherical monopole system: the 'squashed sphere’ in the presence of a monopole-like magnetic field, and the sphere in the presence of a dipole magnetic field. In both cases the magnetic field is neither perpendicular nor constant with respect to the surface on which the charged particles are confined. Furthermore, the spherical dipole system has vanishing net magnetic flux. For the 'squashed sphere’ system we find the lowest Landau level single-particle Hilbert space, and it is shown that the effect of the squashing is to localise the particles around the equator. For the spherical dipole system we find the entire single-particle Hilbert space and energy spectrum. We show that in the strong-field limit the spectrum exhibits a Landau level structure, as in the spherical monopole case. Unlike in the spherical monopole case, each Landau level is shown to be infinitely degenerate. The emergence of this Landau level structure is explained by the tendency of a strong dipole field to localise particles at the poles of the sphere

Perancangan Dashboard dan Forecasting Asuransi Properti dengan Metode Holt-Winters Triple Exponential Smoothing

Insurance is a mechanism for transferring the impact of a risk to another party. PT. XYZ is an insurance company based in Bandung and focuses on property insurance products. There is a problem where this company does not have an interactive data visualization that can show the company's performance. For this reason, researchers created a solution in the form of an interactive dashboard accompanied by forecasting using the Holt-Winters Triple Exponential Smoothing method to predict the number of registered policies in the future. The addition of secondary data from the website of the National Disaster Management Agency (BNPB) to display the distribution of the types of natural disasters that occur. All data obtained has regional boundaries in West Java and ranges from 2016 to 2022. From the research that has been carried out, a dashboard has been produced that can display visualizations of the spread of disasters, visualization of graphs comparing the number of policies and claims, visualization of insurance renewal percentages, visualization of the top 5 occupations property, visualization of the top 5 property insurance products, KPI sales, and forecasting results with an indication of a Mean Absolute Percentage Error (MAPE) of 20.22% which is indicated as feasible

The Effects of Self-Management Strategies on Toothbrushing for Adults in a Supported Community Living

Personal hygiene is an important area related to positive health. Three participants who independently brushed their teeth but did not brush frequently or completely were taught to record and implement a self-management checklist. Behavioral Skill Training (BST) was used to train participants to accurately complete and implement the checklist. Results showed that all participants increased accuracy of toothbrushing steps and learned to independently implement the checklist. These results indicated that those with appropriate pre-requisite skills can benefit from learning how to implement self-management strategies. Limitations and recommendations for future research were discussed

Random Chern-Simons matter in D=1D=1

We study a version of the 2-body Sachdev-Ye-Kitaev (SYK$_{2}$) model with complex fermions coupled to a 1-dimensional gauge field $A(t)$ with the aim of exploring a gauged AdS/SYK correspondence. The gauge field itself can be thought of as arising from a radial symmetry reduction of a $(2+1)$-dimensional Chern-Simons gauge field $A_{\mu}(t,\mathbf{x})$. Using the diagnostic tools of the out-of-time-order correlator (OTOC) and spectral form factor (SFF), which probe the sensitivity to initial conditions and the spectral statistics respectively, we give a detailed and pedagogical study of the integrable/chaotic properties of the model. We find that the coupling to the Chern-Simons gauge field has no effect on the OTOCs and, by extension, the early-time chaos properties of the model. We also find two notable effects of the gauge field on the spectral form factor; an enhancement of the early-time slope and the emergence of an explicit disorder scale needed for the manifestation of zero modes. These zero modes are responsible for the late-time exponential ramp in the quadratic SYK model.Comment: 25+3 pages and appendices; v2: Replaced figures which did not compile correctl

Mussel adhesive protein inspired coatings: a versatile method to fabricate silica films on various surfaces

A simple and versatile biomimetic strategy for the fabrication of silica films on a variety of substrates including gold, polystyrene and silicon wafers was developed using nanogram amounts per cm 2 of silicatein. The strategy exploits the adhesive property of 3,4-dihydroxyphenylalanine (DOPA) and a decapeptide (Ala-Lys-Pro-Ser-Tyr-DHP-Hyp-Thr-DOPA-Lys), important components of mussel adhesive proteins, to modify the surface of substrates. DOPA molecules polymerize to poly(DOPA) and the decapeptide forms thin films on gold substrates at pH 8.5, rendering the substrate compatible for silicatein immobilization. Nearly 50 ng cm 2 of silicatein is immobilized on poly(DOPA) and decapeptide coated surfaces where these polymer films act as "cushion" to protect the active structure and maintain the activity of the largely chemically adsorbed silicatein at ca. 95% of that experienced in solution. Uniform silica films of thickness 130-140 nm and roughness 12-14.5 nm were fabricated on coated gold surfaces. Evidence to show that this method is also applicable for the fabrication of uniform silica films on polystyrene and silicon substrates over multiple length scales in an economical way is also presented

Colour Between the Lines: Self-determination and the Creation of Settings as Resistance to Structural Violence

For many people from communities of the African diaspora in Australia, raced-based discrimination through mechanisms of structural violence frames day to day lived experiences. Yet, while racialised and other forms of structural violence pervade the lives of black people and other marginalised groups, individuals and communities also resist and survive every day. Resistance and struggles for survival are evident in the creation of alternative settings that are important for affirming culture and histories, and for providing opportunities for a sense of community, consciousness raising, and constructing new and alternative narratives to those that pervade dominant cultural contexts. The focus of this paper is to examine the formation of a self-determined alternative setting within the broader context of race relations in Naarm/Birraranga (Melbourne). A secondary focus of this paper is to describe community engaged ways of working that were engendered by the setting, as university-based researchers collaborated with a collective of creative practitioners to document the project. The alternative setting examined is called Colour Between the Lines, a self-determined initiative comprising a collective of five creative practitioners from the African diaspora. We describe the emergence of CBTL as an enactment of racial justice through the self-determined activity that has emerged from a group of people who individually and collectively continue to be subjected to racialised structural violence. We suggest that CBTL can be understood as an alternative setting that further engenders important forms of resistance and community making, and that is shaped and constrained by social power relations. Thus, we argue the need as community-based researchers to work with and within communities, engaging in critical and collaborative forms of anti-racist and decolonial praxis to support the creation of such settings

Q Fever Outbreak in Industrial Setting

An outbreak of Q fever was likely caused by renovation work that aerosolized contaminated straw board