Inertial levitation

We consider the steady levitation of a rigid plate on a thin air cushion with prescribed injection velocity. This injection velocity is assumed to be much larger than that in a conventional Prandtl boundary layer, so that inertial effects dominate. After applying the classical ‘blowhard’ theory of Cole & Aroesty (1968) to the two-dimensional version of the problem, it is shown that in three dimensions the flow may be foliated into streamline surfaces using Lagrangian variables. An example is given of how this may be exploited to solve the three-dimensional problem when the injection pressure distribution is known

AL 'AWATHIF AL ADABIYAH FI QISHAH IMROAH 'INDA NUQTHAH AL SHIFR LI NAWAL AL SA'ADAWI DIRASAH SIKULUJIYAH AL ADABIYAH

Novel “Imro’ah Inda Nuqthoh Al-Shifr” adalah salah satu karya Nawal El-Sa’adawi. Dalam novel Nawal El-Sa’adawi menceritakan kehidupan seorang perempuan yang bernama Firdaus. Firdaus digambarkan sebagai perempuan yang kuat dalam menjalani kehidupannya. Namun, dibalik kekuatannya tersebut Firdaus harus tunduk pada tradisi yang berlaku dimana setiap perempuan harus patuh terhadap laki-laki, dan pada akhirnya mengharuskan dia sebagai pelacur. Lambat laun dia sadar dan tak mau harga dirinya diinjak-injak oleh kaum pria. Sebagai senjata dalam mempertahankan dirinya, akhirnya Firdaus membunuh seorang laki-laki yang menyebabkan dia masuk penjara dan mendapat hukuman gantung. Dalam penelitian ini, peneliti mengangkat 2 rumusan masalah. Pertama, Emosi Syakhsiyah/Halatu Ijabiyah (Emosi yang berdampak Positif) yaitu perasaan pribadi yang dirasakan tokoh-tokoh dalam cerita. Meliputi bahagia, pujian, berusaha, membela, kenikmatan, dan cinta. Kedua, Emosi Alimah/Halatu Salbiyah (Emosi yang berdampak Negatif) perasaan yang menimbulkan kesedihan yang ada dalam tokoh-tokoh cerita ini. Meliputi sedih, takut, marah, kecewa, benci, khawatir, bingung. Metode yang digunakan dalam penelitian ini adalah metode kualitatif yang bersifat deskriptif. Adapun pendekatan yang digunakan dalam penelitian ini adalah pendekatan Psikologi Sastra, yang difokuskan pada teori Emosi Sastra milik Ahmad al-Syayib dalam Kritik Sastra. Data yang dihasilakn yaitu, Emosi Syakhsiyah memiliki 6 emosi, antara lain: Bahagia, pujian, berusaha, membela, kenikmatan, dan cinta. Sedangkan Emosi Alimah memiliki 8 emosi, antara lain: sedih, takut, marah, benci, kecewa, khawatir, bingung dan masing-masing emosi memiliki pengaruh terhadap kejiwaan, perilaku, dan perubahan fisik

Host pathogen interactions in relation to management of light leaf spot disease (caused by Pyrenopeziza brassicae) on Brassica species

Light leaf spot, caused by Pyrenopeziza brassicae, is currently the most damaging disease problem in oilseed rape in the UK. According to recent survey data, the severity of epidemics has increased progressively across the UK, with current yield losses of up to £160M per annum in England and more severe epidemics in Scotland. Light leaf spot is a polycyclic disease with primary inoculum consisting of air-borne ascospores produced on diseased debris from the previous cropping season. Splash-dispersed conidia produced on diseased leaves are the main component of the secondary inoculum. P. brassicae is also able to infect and cause considerable yield losses on vegetable brassicas, especially Brussels sprouts. There may be spread of light leaf spot among different brassica species. Since they have a wide host range, Pyrenopeziza brassicae populations are likely to have considerable genetic diversity and there is evidence suggesting population variations between different regions, which need further study. Available disease-management tools are not sufficient to provide adequate control of the disease. There is a need to identify new sources of resistance, which can be integrated with fungicide applications to achieve sustainable management of light leaf spot. Several major resistance genes and quantitative trait loci have been identified in previous studies, but rapid improvements in the understanding of molecular mechanisms underpinning B. napus – P. brassicae interactions can be expected through exploitation of novel genetic and genomic information for brassicas and extracellular fungal pathogens.Peer reviewe

Magnetohydrodynamic Simulations of Shock Interactions with Radiative Clouds

We present results from two-dimensional numerical simulations of the interactions between magnetized shocks and radiative clouds. Our primary goal is to characterize the dynamical evolution of the shocked clouds. We perform runs in both the strong and weak magnetic field limits and consider three different field orientations. For the geometries considered, we generally find that magnetic fields external to, but concentrated near, the surface of the cloud suppress the growth of destructive hydrodynamic instabilities. External fields also increase the compression of the cloud by effectively acting as a confinement mechanism driven by the interstellar flow and local field stretching. This can have a dramatic effect on both the efficiency of radiative cooling, which tends to increase with increasing magnetic field strength, and on the size and distribution of condensed cooled fragments. In contrast, fields acting predominately internally to the cloud tend to resist compression, thereby inhibiting cooling. We observe that, even at modest strengths, internal fields can completely suppress low-temperature cooling.Comment: 21 pages, 9 figures, to appear in The Astrophysical Journa

Morphological and geographical traits of the British Odonata

Trait data are fundamental for many aspects of ecological research, particularly for modeling species response to environmental change. We synthesised information from the literature (mainly field guides) and direct measurements from museum specimens, providing a comprehensive dataset of 26 attributes, covering the 43 resident species of Odonata in Britain. Traits included in this database range from morphological traits (e.g. body length) to attributes based on the distribution of the species (e.g. climatic restriction). We measured 11 morphometric traits from five adult males and five adult females per species. Using digital callipers, these measurements were taken from dry museum specimens, all of which were wild caught individuals. Repeated measures were also taken to estimate measurement error. The trait data are stored in an online repository (https://github.com/BiologicalRecordsCentre/Odonata_traits), alongside R code designed to give an overview of the morphometric data, and to combine the morphometric data to the single value per trait per species data

Commuter lives: a review symposium on David Bissell's Transit Life

© 2019 Institute of Australian Geographers This article presents a series of commentaries on Transit Life: How Commuting is Transforming Our Cities, published by MIT Press in 2018. Centring on an in—depth case study of Sydney, the book argues the need to attend carefully to the fine—grained detail of the commuting experience. In all sorts of ways, Transit Life presents a way of thinking about urban transportation radically different from that used by mainstream transport planners and geographers. Geographical Research asked six researchers—Tim Edensor, Michele Lobo, Debbie Hopkins, Helen Fitt, Juliana Mansvelt, and Donald McNeill—to reflect on what kind of research vistas might be opened up bring the tools of cultural geography and mobility research to the world of commuting. Here are their responses, rounded out by a reply by David Bissell, Transit Life's author