USGSの最新地震情報
The USGS Latest Earthquakes map shows earthquakes recorded worldwide, with the most recent events on top. The map can be filtered by time period, from the past hour to the past 30 days, and by minimum magnitude, and it can be centered on a region or shown for the entire world. Each event links to a detail page with magnitude, depth, time, location uncertainty and the number of felt reports. Where available, the page also provides ShakeMap, moment tensor and focal mechanism information. The data is reviewed by seismologists, so early values for a new event can change within minutes. USGS publishes the same data as GeoJSON, CSV and other […]
MITオープンコースウェア
MIT OpenCourseWare publishes course materials from MIT classes for free use. A course page typically holds the syllabus, lecture notes, assignments, exams with solutions and, for many courses, recorded lectures.The catalog spans engineering, physics, mathematics, computer science, materials, biology and management, from introductory subjects to graduate level. Course pages are searchable by department, topic and level, and many include readings, problem sets and project descriptions that can be used for structured self study.Content is licensed under Creative Commons BY-NC-SA, which allows reuse with attribution for non-commercial purposes.OCW does not provide MIT credit, certificates or access to instructors, and the materials reflect the semester in which the course was taught.
没入型線形代数
Immersive Linear Algebra is a free interactive textbook written by Jacob Strom, Kalle Astrom and Tomas Akenine-Moller. The figures are interactive, so vectors, planes, matrices and transformations can be moved and rotated directly in the page to see how a result changes. The book covers vectors, dot and cross products, matrices, systems of linear equations and determinants, with a visual explanation placed next to each definition. The geometric approach is aimed at readers who need the subject for computer graphics, mechanics, signal processing or machine learning. A lot of sketches, and interactive tools. It works in the browser without installation or registration. The book is a teaching text, so it […]
ハイパーフィジックス
HyperPhysics is a physics reference built by Carl Nave at Georgia State University. Instead of linear chapters, topics are connected as concept maps, so a reader can move from one idea to related ones in a few clicks.Areas include mechanics, thermodynamics, electricity and magnetism, optics, sound, quantum physics, nuclear physics, relativity and astrophysics. Many pages combine a short explanation with the relevant equations and an embedded calculator that computes a result from entered values, for example for lens equations, fluid flow or radiation.Old style site 😉 and no https, but valuable information … and fast loadingThe site is free, needs no registration and is a quick way to refresh a […]
電力供給マップ
Electricity Maps shows the real time electricity mix and carbon intensity of power grids around the world. For each zone, the map gives the share of sources such as wind, solar, hydro, nuclear, gas, coal and oil, the carbon intensity in grams of CO2 equivalent per kilowatt hour and the share of low carbon generation.For cultural, economics and LCA studies.Power flows between neighboring zones are displayed, so imports and exports are visible, and the history of the last hours and days can be viewed. Forecasts of carbon intensity are available for many zones, which supports scheduling of energy-intensive jobs such as battery charging, compute loads or industrial processes at times […]
NOAA宇宙天気予報センター
The Space Weather Prediction Center is the official US source for space weather observations, forecasts and alerts. The site shows the current state of the Sun and near-Earth space, including solar wind speed and density, the interplanetary magnetic field, X-ray flux, proton and electron flux and the planetary Kp index.Alerts, watches and warnings are issued for geomagnetic storms, solar radiation storms and radio blackouts, using NOAA scales from 1 to 5 that describe the expected impact on power grids, satellites, HF radio and GPS. An aurora forecast map, solar imagery and a three day forecast are included, and the data is also available as machine-readable products.Extremely good quality data and […]
ダウンディテクター
Downdetector tracks outages of online services in real time from user reports. Each service has a page with a chart of reported problems over the last 24 hours, the most frequent problem types and a map that shows where the reports come from. Coverage includes internet providers, cloud and SaaS platforms, banks, payment systems, games and mobile networks, with country-specific sites for many regions. A sudden rise above the normal baseline indicates an incident, and the page lists comments from affected users that often identify the failing component. Good service and history feature … with ads … The signal comes from crowdsourced reports, so it shows user perception and not […]
Googleトレンド
Google Trends shows how the search interest for a term varies over time and by region, together with related queries and topics. Several terms can be compared on the same chart.It gives a quick view of demand and seasonality without running a survey. Rising related queries can point to new needs or new vocabulary in a market.Unique for marketers and product developers. Not sure if your own searches here do influence the following statistics ….Product developers and innovation teams use it to test whether a concept attracts interest and to compare names or technologies. Engineers and scientists use it to follow the public attention to a technology.
推力曲線ロケットモーターデータベース
ThrustCurve.org is a unique database of model and high-power rocket motors with performance data and thrust curve files. Motors can be searched by size, impulse class and manufacturer.The data files can be loaded into rocket simulation programs, which makes a flight simulation possible without measuring the motor yourself.User submitted test data are also included for comparison with certified data.Tip: rocket designers and hobbyists use it to select a motor and simulate altitude and velocity. Aerospace students and engineers use it as a source of real thrust curves for propulsion and flight dynamics exercises.
NASA天体物理データシステム（ADS）
The NASA Astrophysics Data System is a search engine for literature in astronomy, astrophysics, physics and space science. It returns abstracts, citation counts and links to the full text where available.Its coverage of the field is deep, with citation and reference links that allow following the development of a result. Searches support fielded queries and can be saved in libraries.Scientists shall use it for literature reviews in astrophysics and planetary science. Space engineers use it to find papers on instruments, detectors and mission concepts, and product developers use it to track research in remote sensing and space technology.