The geomagnetic field simulator for ground-based testing of nanosatellite orientation systems

В статье приводится обзор существующих отечественных и зарубежных стендов дляполунатурного моделирования систем ориентации наноспутников. Проведен их сравнительный анализ по основным техническим характеристикам. Определены общие тенденции в структуре стендов. Приведены результаты проектирования имитатора геомагнитного поля для обеспечения испытания наноспутников размером не превышающих границ сферы диаметром 100 мм.The article provides an overview of existing domestic and foreign stands for semi-realistic modeling of nanosatellite orientation systems. Their comparative analysis on the basic technical characteristics is carried out. The general trends in the structure of the stands are determined. The results of designing a geomagnetic field simulator for providing a test of nanosatellites of a size not exceeding 100 mm diameter spheres are given

Interplay of anisotropy in shape and interactions in charged platelet suspensions

Motivated by the intriguing phase behavior of charged colloidal platelets, we investigate the structure and dynamics of charged repulsive disks by means of Monte-Carlo simulations. The electrostatic interactions are taken into account through an effective two-body potential, obtained within the non-linear Poisson-Boltzmann formalism, which has the form of anisotropic screened Coulomb potential. Recently, we showed that the original intrinsic anisotropy of the electrostatic potential in competition with excluded volume effects leads to a rich phase behavior that not only includes various liquid-crsytalline phases but also predicts the existence of novel structures composed of alternating nematic-antinematic sheets. Here, we examine the structural and dynamical signatures of each of the observed structures for both translational and rotational degrees of freedom. Finally, we discuss the influence of effective charge value and our results in relation to experimental findings on charged platelet suspensions.Comment: 22 pages, 17 figure

TPU positioning in the global research and educational environment

Томск вошел в число инновационных городов мира по результатам авторитетного рейтинга "Innovation Cities Global Index 2012-2013". Всего в рейтинг попали 445из 1542 городов мира, где проводились исследования. Российских городов - 20. Большой вклад в инновационную составляющую города вносит Томский консор-циум научно-образовательных и научных организаций, возглавляемый ректором ТПУ П.С. Чубиком. Университеты становятся активными игроками не только в производстве новых знаний, но и в их распространении и использовании посредствоминновационной деятельности.Tomsk is rated as one of the global innovative cities by the reputable ranking Innovation Cities Global Index 2012-2013. The survey covered 1542 cities of the world, with 445 ofthem having been included in the ranked list. There were 20 Russian cities rated. A great contribution to the Tomsk innovative component is provided by Tomsk Consortium ofResearch and Educational Organizations headed by P.S. Chubik, TPU Rector. Universities are becoming actively involved not only in the generation of new knowledge, but also in its dissemination and application by means of innovative activities

Quantification of MagLIF morphology using the Mallat Scattering Transformation

The morphology of the stagnated plasma resulting from Magnetized Liner Inertial Fusion (MagLIF) is measured by imaging the self-emission x-rays coming from the multi-keV plasma. Equivalent diagnostic response can be generated by integrated radiation-magnetohydrodynamic (rad-MHD) simulations from programs such as HYDRA and GORGON. There have been only limited quantitative ways to compare the image morphology, that is the texture, of simulations and experiments. We have developed a metric of image morphology based on the Mallat Scattering Transformation (MST), a transformation that has proved to be effective at distinguishing textures, sounds, and written characters. This metric is designed, demonstrated, and refined by classifying ensembles (i.e., classes) of synthetic stagnation images, and by regressing an ensemble of synthetic stagnation images to the morphology (i.e., model) parameters used to generate the synthetic images. We use this metric to quantitatively compare simulations to experimental images, experimental images to each other, and to estimate the morphological parameters of the experimental images with uncertainty. This coordinate space has proved very adept at doing a sophisticated relative background subtraction in the MST space. This was needed to compare the experimental self emission images to the rad-MHD simulation images.Comment: 19 pages, 18 figures, 3 tables, 4 animations, accepted for publication in Physics of Plasmas; arXiv admin note: substantial text overlap with arXiv:1911.0235

Increase of the mean inner Coulomb potential in Au clusters induced by surface tension and its implication for electron scattering

Electron holography in a transmission electron microscope was applied to measure the phase shift induced by Au clusters as a function of the cluster size. Large phase shifts Df observed for small Au clusters cannot be described by the well-known equation Df=C_E V_0 t (C_E: interaction constant, V_0: mean inner Coulomb potential (MIP) of bulk gold, t: cluster thickness). The rapid increase of the Au MIP with decreasing cluster size derived from Df, can be explained by the compressive strain of surface atoms in the cluster

Zebrafish type I collagen mutants faithfully recapitulate human type I collagenopathies

The type I collagenopathies are a group of heterogeneous connective tissue disorders, that are caused by mutations in the genes encoding type I collagen and include specific forms of osteogenesis imperfecta (OI) and the Ehlers-Danlos syndrome (EDS). These disorders present with a broad disease spectrum and large clinical variability of which the underlying genetic basis is still poorly understood. In this study, we systematically analyzed skeletal phenotypes in a large set of zebrafish, with diverse mutations in the genes encoding type I collagen, representing different genetic forms of human OI, and a zebrafish model resembling human EDS, which harbors a number of soft connective tissues defects, typical of EDS. Furthermore, we provide insight into how zebrafish and human type I collagen are compositionally and functionally related, which is relevant in the interpretation of human type I collagen-related disease models. Our studies reveal a high degree of intergenotype variability in phenotypic expressivity that closely correlates with associated OI severity. Furthermore, we demonstrate the potential for select mutations to give rise to phenotypic variability, mirroring the clinical variability associated with human disease pathology. Therefore, our work suggests the future potential for zebrafish to aid in identifying unknown genetic modifiers and mechanisms underlying the phenotypic variability in OI and related disorders. This will improve diagnostic strategies and enable the discovery of new targetable pathways for pharmacological intervention

SB25-10/11: ASUM Transportation Fee

SB25-10/11: ASUM Transportation Fee. This resolution passed during the March 9, 2011 meeting of the Associated Students of the University of Montana (ASUM)