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Há 3 dias · Spin is an intrinsic form of angular momentum carried by elementary particles, and thus by composite particles such as hadrons, atomic nuclei, and atoms. [1] [2] : 183 –184 Spin is quantized, and accurate models for the interaction with spin require relativistic quantum mechanics or quantum field theory . The existence of electron spin ...
Há 1 dia · Electronic waste (or e-waste) describes discarded electrical or electronic devices. It is also commonly known as waste electrical and electronic equipment ( WEEE) or end-of-life ( EOL) electronics. [1] Used electronics which are destined for refurbishment, reuse, resale, salvage recycling through material recovery, or disposal are also ...
Há 3 dias · 相对于 X-射线，电子束由于具有更短的波长以及更强的衍射，因此电子衍射应用于纳米晶体的结构分析具有特别的意义，透射电镜不仅可对纳米晶体进行高分辨成像而且可进行电子衍射分析，已成为纳米晶体材料不可或缺的研究方法，包括判断纳米结构的生长 ...
Há 4 dias · 内容简介. 《材料科学经典著作选译：透射电子显微学（上册 第2版）》对透射电子显微镜的构造、实验技术的原理和应用进行了详细介绍。. 第二版已对一版内容进行了修订和更新。. 解释了为什么需要用到这一特殊的技术以及如何将这一特定概念运用到实践中 ...
Há 4 dias · Electron est un lanceur bi-étages de 18 mètres de haut, de 1,2 mètre de diamètre et d'une masse de 12,5 tonnes. Sa propulsion est assurée par des moteurs-fusées développés par le constructeur et brûlant un mélange de kérosène et d' oxygène liquide.
Há 3 dias · Selenium is a chemical element; it has the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. [9] It seldom occurs in its elemental state or as pure ore ...
Há 1 dia · John Finch. Kenneth Holmes. Rosalind Elsie Franklin (25 July 1920 – 16 April 1958) [1] was a British chemist and X-ray crystallographer whose work was central to the understanding of the molecular structures of DNA (deoxyribonucleic acid), RNA (ribonucleic acid), viruses, coal, and graphite. [2] Although her works on coal and viruses were ...
