Imaging of phenomena in the night atmosphere

This is a technical report for the educational engineering for imaging in the thermal infrared wave. It is used to make programming of visualization, and introduction to environmental lectures

A pseudo Circle expressed by Iterations:Stationary point, Symmetry, Fractal, Morphing

This is a text for Science Seminar 2018 in University of Edogawa. The object is to search interesting phenomena on computing. It’s constructed as a reference material for discussions between a tutor and students. Continuous movements in consecutive time are replaced by the iterative operations; and rendering patterns in the finite times are discussed. We show a figure like the circle, but the characters are different from it. After discussing phenomena, we modify surroundings of generating equations

Equations and images expressed by a Hyper complex

We have heard the number can be designed freely under the field that satisfied 4 arithmetic operations. We introduce number-systems having plural imaginary axes, in which are derived from “kaleidoscopic” primes. The operational logic is kept like as the complex field. Some images connected to equations are found

Two dimensional Fourier Transformation

　Image processing is discussed for RAW format in digital cameras. The points are (1) suppression of noises, (2) amplifier of colors, (3) projection of dynamic range. Base technique is Fourier transformation in finite period. The expression is known as for multi-dimensional forms. However, if it is applied simply for image photographed in fields, he/she would get less information than his/her expectation. The reason is to make inappropriate preprocessing for Fourier transformation. We propose preprocessing about (1~3) points; and as several typical cases, we show the effects.\n　Figures and graphs are drawn by using full color. The true images will be got from Web-pages

Environmental information extracted from satellite images:Aspects of Sea and Atmosphere

To extract environmental information from published satellite pictures, computer approaches are discussed. Satellite images are given as time-series multi-spectrum bands, and include many phenomena. To analyze a target event, others must be eliminated. The approaches are projection, compositing, intensity-ordering hold non-linear transformations, etc., which are defined by mathematical expressions. We apply them to see hue changes on the sea surfaces, and to detect reactions in the air between dust and moisture. Processing images get significant in relations with environmental knowledges and experiences

Programming reaction-diffusion equation

P(論文)偏微分方程式の実習用のプログラミング・コーディングについて述べます。偏微分方程式は拡散などの諸現象を表現する方程式です。しかし対象が多岐にわたるので、解への接近法が複数存在します。汎用的なプログラム製品も市販されています。我々は、自作するのも教育的観点からは重要と考えています。ここでは近似レベルは粗いのですが、方針が理解しやすい前進・陽解法を採用します。そして、拡散と移流項の他に、生化学的に興味深い項を追加して、解の変化を調べます。We write about programming/coding for practice of partial differential equations. Partial differential equations express various phenomena; however, due to wide varieties of subjects, there are many approaches reach to solutions. General-purpose program products are also commercially available. We believe that making your own is also important from an educational point of view. 　Although the approximation level is rough here, we adopt the forward explicit approach whose policy is easy to understand. Then, besides the diffusion and advection terms, we add biochemically interesting terms to see how the solution changes.departmental bulletin pape

Definition of wind vectors and movement of dusts in air

To discuss the movement of dusts in the air, we show a construction of wind fields, a separation approach of the convection-diffusion equation, and a modeling of a forest fire. They are tested in case of a forest fire in Namie town in 2017, where is radioactive contaminated area. 137Cs dust is observed there, and the re-diffusion is found

Detection of invisible SPM distribution in the sky

Suspended Particulate Matter (SPM) is dusts in the atmosphere, which exists from ancient times. Nowadays, they have two origins that are natural and artificial. The diameter is distributed between 1 ~ 10 μm. Natural SPM is almost soil particles, and includes bacteria and virus on the surfaces. Artificial SPM is industry by-products; that is, complex matters over one hundred kinds of compounds. Even if SPM is under the gravity, the falling speed is negligible, and it moves as well as the gas. As property of small particles, it attracts many substances. If SPM moves through polluted air, it transports contamination matters towards leeward. The phenomenon is found beyond countries. An example is the yellow sand arising from Taklamakan desert flows until Greenland. SPM is a meteorological word. We hear it as “PM2.5” in various media. Very concentrated SPM makes the sky be cloudy. The phenomenon is not found yet in Japan. Existence of dilute SPM is detected as hazy sky, which degree is small. Therefore; we detect the haze by using digital cameras. We have observed the SPM at Norikura observatory from 2011 until 2016. This is a report of the digital measurements and discussions of the image processing. Where, conception of physical color, meaning of color-ratio, contouring image approach as extraction of character of targets, two dimensional Fourier Transformation are discussed.\n Figures are drawn by using full color. The true images will be got from Web-pages

Education of environmental science using a blog

For self-study under COVID-19, we publish an education/research blog for environmental science. The blog premise is: there is a discussion with professors such as using e-mail; and teaching materials for self-study. So, there is less descriptionin the blog, but many images are posted. They are processed by 7 imaging-parameters, and important patterns areemphasized. We explain meanings of the parameters. The blog has been open to public since July 14, 2020. On Jan. 8, 2021, there are over 200 articles. They are about weather, dust, sea surface anomalies, and volcanic conditions on the Earth’s hemisphere that can be detected by a geostationary satellite at 140.7 degrees east longitude