Please log in

Paper / Information search system

日本語

ENGLISH

Help

Please log in

  • Summary & Details

History and Perspective of Definition of Ampere

アンペアの定義の変遷と今後の電気標準の展望

Detailed Information

Category(J)ホットトピックス

Translation

Category(E)Hot Topics
Author(J)1) 金子晋久
Author(E)1) Nobu-Hisa Kaneko
Affiliation(J)1) 産業技術総合研究所
Abstract(J)電気標準は器物による古典的な標準から電磁気学に基づく標準へと進化し、2019年に改定された最新の国際単位系(SI)では量子力学に基づく電気標準が他の標準と調和する形で成立した。本稿では標準の歴史的経緯と進化の過程を概観したあと、現在の量子電気標準の特徴とその産業へのインパクトについて解説する。

Translation

Abstract(E)Electrical standards firstly established based on artefacts had been developed to that based on electromagnetism, and in 2019, the International System of Units(SI)was revised such that the quantum electrical standards harmonize with other standards. Browsing the history and the process of the development of the standards, the characteristics and the impact to industry are introduced.

About search

close

How to use the search box

You can enter up to 5 search conditions. The number of search boxes can be increased or decreased with the "+" and "-" buttons on the right.
If you enter multiple words separated by spaces in one search box, the data that "contains all" of the entered words will be searched (AND search).
Example) X (space) Y → "X and Y (including)"

How to use "AND" and "OR" pull-down

If "AND" is specified, the "contains both" data of the phrase entered in the previous and next search boxes will be searched. If you specify "OR", the data that "contains" any of the words entered in the search boxes before and after is searched.
Example) X AND Y → "X and Y (including)"  X OR Z → "X or Z (including)"
If AND and OR searches are mixed, OR search has priority.
Example) X AND Y OR Z → X AND (Y OR Z)
If AND search and multiple OR search are mixed, OR search has priority.
Example) W AND X OR Y OR Z → W AND (X OR Y OR Z)

How to use the search filters

Use the "search filters" when you want to narrow down the search results, such as when there are too many search results. If you check each item, the search results will be narrowed down to only the data that includes that item.
The number in "()" after each item is the number of data that includes that item.

Search tips

When searching by author name, enter the first and last name separated by a space, such as "Taro Jidosha".