DSN Now
DSN Now is the NASA JPL live display of the Deep Space Network, the antenna complexes at Goldstone in California, Madrid in Spain and Canberra in Australia that communicate with spacecraft beyond Earth orbit. The page shows each antenna and the spacecraft it is currently tracking.For each active link it lists the spacecraft name, the signal direction, the data rate, the signal power and the frequency band, together with the distance from Earth and the round trip light time. Links are updated every few seconds, so a connection that starts or ends during observation can be seen as it happens.Our view: unique. Feel top scientists! Live observation or monitoring, a […]
ブリッツォルトゥング
Blitzortung is a community operated lightning detection network that shows lightning strikes on a live map. The map displays strikes as they are detected, with color indicating the age of each strike, and offers views for Europe, North America, Oceania, South America, Asia and Africa as well as for the whole world. Detection is based on a worldwide network of volunteer operated VLF receivers that record the radio signal of a discharge with GPS timestamps. The location is computed from the differences in arrival time at several stations, which provides a position for each strike. The map also shows the active stations and statistics such as strike counts and detection […]
風が強い
Windy is a visualization platform for weather data, showing wind, gusts, temperature, pressure, precipitation, clouds, waves and many other layers as animated maps. The interface lets the user select a forecast model, an altitude level and a time step, and also display radar, satellite and lightning layers as observations.Our view: a must, extremely visual and precise info, for both a local and a global view. Its info is frequently republished or citedSeveral numerical models are available for comparison, including ECMWF, GFS and ICON, so differences between model runs are visible for the same location. A point forecast, a meteogram and an airgram for a selected location give detail on wind […]
回路のすべて教科書
The Textbook section of All About Circuits hosts Lessons in Electric Circuits, a free electronics textbook by Tony R. Kuphaldt. It is organized in volumes on DC circuits, AC circuits, semiconductors, digital circuits and a reference volume. Each volume moves from basic concepts such as voltage, current, resistance and the fundamental circuit laws to network analysis, filters, transistors, operational amplifiers and logic gates, with worked examples and explanatory diagrams. Chapters are short and can be read as a reference for a single topic. The book is published under an open license and can be read online without registration. It is a solid foundation for engineers from other disciplines who need […]
視覚的に解説
Explained Visually is a set of interactive explanations created by Victor Powell and Lewis Lehe at setosa.io. Each page takes one mathematical or statistical idea and lets the reader change parameters while the visualization updates. Topics include Markov chains, eigenvectors and eigenvalues, principal component analysis, ordinary least squares regression, conditional probability and image kernels. Short text sections accompany each interactive element, so the effect of an input on the result can be observed directly. The pages are free and need no registration. They explain concepts at an introductory to intermediate level and are useful as a quick visual intuition before applying the method in software. The set of topics is […]
IPアドレスブラックリストチェック
The IP Address Blacklist Check tool on WhatIsMyIP.com serves as a diagnostic gateway for auditing the reputation of a specific IP address against more than 70 DNS-based Blackhole Lists (DNSBL) and Real-time Blackhole Lists (RBL). By cross-referencing an IP against these global databases, the service identifies whether a network identifier has been flagged for activities such as spam propagation, malware hosting, or botnet participation. This utility is essential for identifying the root cause of communication failures where outbound traffic is being silently dropped or rejected by remote mail servers and security appliances.Tip: if you’re on an internet provider rotating its IPs, and you can’t access some site or notice you […]
CivilMath 土木工学計算機ディレクトリ
CivilMath provides a specialized suite of web-based calculators designed for structural, geotechnical, hydraulic, and transportation engineering analysis. The platform facilitates complex technical computations for beam deflection, truss forces, and section properties, alongside geotechnical modules for assessing soil bearing capacity and lateral earth pressure. It also includes utilities for fluid mechanics, such as pipe flow and open channel hydraulics, as well as surveying and general mathematical functions. These tools allow users to input specific geometric and material parameters to generate precise data based on established engineering formulas and regulatory standards.Structural engineers and construction professionals employ these calculators to perform rapid design verification and feasibility studies for infrastructure projects. In manufacturing and […]
BOINC（Berkeley Open Infrastructure for Network Computing）プロジェクトアプリ
BOINC (Berkeley Open Infrastructure for Network Computing) is free, open-source software that lets people donate their computer’s spare processing power to scientific research. It was created at UC Berkeley’s Space Sciences Laboratory, originally to run SETI@home, and was released as a general platform in 2002.How it works: You install the BOINC client and choose which research projects to support. When your computer is idle, or running at a limit you set, the client downloads small chunks of work from the project’s server, computes them, and uploads the results. The project then combines results from thousands or millions of volunteer machines. Redundancy (the same task sent to multiple volunteers) helps catch […]
NIOSH 持ち上げ計算式計算機
This calculator applies the revised NIOSH lifting equation. Inputs are the horizontal and vertical location of the load, the lift distance, the asymmetry angle, the frequency, the duration and the coupling. The results are a recommended weight limit and a lifting index.The lifting index compares the actual load with the recommended limit, so a task can be rated at a glance. Running the numbers in a tool avoids errors in the multipliers of the manual method.Ergonomists and manufacturing engineers use it to assess and redesign manual lifting tasks. Product developers use it to set a maximum weight for a part, a tool or a package handled by people.Tip: do read […]
DINED人体計測データベース
DINED is an anthropometric database of body dimensions from Delft University of Technology. It provides measurements such as stature, reach and hand size for several populations, with percentiles, and tools to select the dimensions relevant to a design.Design decisions based on a single average user fail for many people. Percentile data allows designing for a chosen share of the population, for example from the 5th to the 95th percentile.A must for any ergonomic study, manufacturing bench or product design. Note that the datasets used are 5 to 20 years old.Registration, free, is required to access most of the data. The student dataset can usually be used in several tools as […]