山手線は丸いのか？プログラマのためのトポロジー入門

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Henri Poincaré (1854–1912)
“la mathématique est l'art de donner le même nom à des choses différentes.” Science et Méthode, 1908.

F. Klein (1849-1925)
“Given a manifold and a transformation group acting on it, to investigate those properties of figures
on that manifold which are invariant under all transformations of that group.”

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Context. Determining the size distribution of asteroids is key to understanding the collisional history and evolution of the inner Solar System. Aims. We aim to improve our knowledge of the size distribution of small asteroids in the main belt by determining the parallaxes of newly detected asteroids in the Hubble Space Telescope (HST) archive and subsequently their absolute magnitudes and sizes. Methods. Asteroids appear as curved trails in HST images because of the parallax induced by the fast orbital motion of the spacecraft. Taking into account the trajectory of this latter, the parallax effect can be computed to obtain the distance to the asteroids by fitting simulated trajectories to the observed trails. Using distance, we can obtain the absolute magnitude of an object and an estimation of its size assuming an albedo value, along with some boundaries for its orbital parameters. Results. In this work, we analyse a set of 632 serendipitously imaged asteroids found in the ESA HST archive. Images were captured with the ACS/WFC and WFC3/UVIS instruments. A machine learning algorithm (trained with the results of a citizen science project) was used to detect objects in these images as part of a previous study. Our raw data consist of 1031 asteroid trails from unknown objects, not matching any entries in the Minor Planet Center (MPC) database using their coordinates and imaging time. We also found 670 trails from known objects (objects featuring matching entries in the MPC). After an accuracy assessment and filtering process, our analysed HST asteroid set consists of 454 unknown objects and 178 known objects. We obtain a sample dominated by potential main belt objects featuring absolute magnitudes (H) mostly between 15 and 22 mag. The absolute magnitude cumulative distribution logN(H > H0) ∝ αlog(H0) confirms the previously reported slope change for 15 < H < 18, from α ≈ 0.56 to α ≈ 0.26, maintained in our case down to absolute magnitudes of around H ≈ 20, and therefore expanding the previous result by approximately two magnitudes. Conclusions. HST archival observations can be used as an asteroid survey because the telescope pointings are statistically randomly oriented in the sky and cover long periods of time. They allow us to expand the current best samples of astronomical objects at no extra cost in regard to telescope time.

Hubble Asteroid Hunter III. Physical properties of newly found asteroids

Hubble Asteroid Hunter III. Physical properties of newly found asteroids

Hubble Asteroid Hunter III. Physical properties of newly found asteroids

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The presentation first gives the brief introduction about the animal communication covering the reasons for communication. It then describes the important types of animal communication emphasizing the important points regarding auditory and visual communication. With respect to auditory communication, it covers the uses of it and mechanisms of auditory communication along with examples. Later the presentation discusses the various forms of visual communication such as gestures, postures, facial expressions, color changes , bioluminescent communication. It then describes the visual communication in bees in the form of bee dance . In bee dance it gives a brief overview of round dance , sickle dance and waggle dance .

Animal Communication- Auditory and Visual.pptx

Animal Communication- Auditory and Visual.pptx

Animal Communication- Auditory and Visual.pptx

HotJupiters are amongthebest-studied exoplanets, but it is still poorly understood how their chemical composition and cloud properties vary with longitude. Theoretical models predict that clouds may condense on the nightside and that molecular abundances can be driven out of equilibrium by zonal winds. Here we report a phase-resolved emission spectrum of the hot Jupiter WASP-43b measured from 5–12µ 5–12µ 5–12µm with JWST’s Mid-Infrared Instrument (MIRI). 1524 ±35 1524 ±35 and 863±23 The spectra reveal a large day–night temperature contrast (with average brightness temperatures of 1524 ± 35 863 ±23 863 ±23Kelvin, respectively) and evidence for water absorption at all orbital phases. Comparisons with three-dimensional atmospheric models show that both the phase curve shape and emission spectra strongly suggest the presence of nightside clouds which become optically thick to thermal emission at pressures greater than ∼100mbar. The dayside is consistent with a cloudless atmosphere above the mid-infrared photosphere. Con3trary to expectations from equilibrium chemistry but consistent with disequilibrium kinetics models, methane is not detected on the nightside (2σ upper limit of 1–6 parts per million, depending on model assumptions).

Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

Botany is the branch of biology that deals with the scientific study of plants, including their structure, growth, reproduction, metabolism, development, and classification. It encompasses a wide range of topics, from the molecular biology of plant cells to the ecological relationships between plants and their environments. Botany is essential for understanding plant diversity, ecology, evolution, and the roles plants play in ecosystems and human societies.

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CELL -Structural and Functional unit of life.pdf

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CELL -Structural and Functional unit of life.pdf

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Hubble Asteroid Hunter III. Physical properties of newly found asteroids

Hubble Asteroid Hunter III. Physical properties of newly found asteroids

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Animal Communication- Auditory and Visual.pptx

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Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

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Botany 4th semester series (krishna).pdf

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8. Henri Poincaré (1854–1912) “la mathématique est l'art de donner le même nom à des choses différentes.” Science et Méthode, 1908.

11. F. Klein (1849-1925) “Given a manifold and a transformation group acting on it, to investigate those properties of figures on that manifold which are invariant under all transformations of that group.”

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