As with all elements, aluminum is a pure chemical substance that can't be broken down into something simpler. All elements are arranged in the periodic table by their atomic number -- the number of protons in their nucleus. Aluminum's lucky number is 13, so an aluminum atom has 13 ...
在司法审判中，所谓肯定性误判是指把无罪者判为有罪，否定性误判是指把有罪判为无罪。肯定性误判就是所谓的错判，否定性误判就是所谓的错放．而司法公正的根本原则是“不放过一个坏人，不冤枉一个好人”。某法学家认为，目前，衡量一个法院在办案中对司法公正的原则贯彻得是否足够好，就看它的肯定性误判率是否...
Aluminum atoms have 13 electrons circling the nucleus. Each atom has a preferred number of electrons zipping around its nucleus. Electrons circle the nucleus in fixed orbits -- a simplified way to think about it is to imagine how satellites orbit the Earth. There's a huge amount of theory ...
A cruise missile's job in life is to deliver a 1,000-pound (450-kg) high-explosive bomb to a precise location -- the target. The missile is destroyed when the bomb explodes. Since cruise missiles cost between $500,000 and $1,000,000 each, it's a fairly expensive way to deliver ...
It is less expensive to manufacture, and a bomber can carry more of them on each mission. Making a Better Bunker Buster To make bunker busters that can go even deeper, designers have three choices: They can make the weapon heavier. More weight gives the bomb more kinetic energy when it...
There are many stuffy rules about wine, from the type of container it should come in to how expensive it should be. One common myth is that a bottle of wine should be fully consumed the same day it's opened. While it's true that vino does start to oxidize the moment the cork comes...
This cold is insulated by a vacuum. While superconductive magnets are expensive, the strong magnetic field allows for the highest-quality imaging, and superconductivity keeps the system economical to operate. The Other Parts of an MRI Machine Two other magnets are used in MRI systems to a much...
Benefits of Aluminum-Based Printed Circuit Boards Metal core PCBs have a unique set of advantages compared to other base materials. Less expensive Aluminum is native to a variety of climates so it’s easy to mine & refine. This makes it significantly less costly to mine and refine than other...
While incredibly expensive, only lamé made using genuine gold, silver, platinum, or another precious metal can truly be considered “cloth of gold.” 8. Aluminum or imitation lamé Lamé consisting of aluminum wound around rayon, polyester, or another type of synthetic textile fiber may be signi...
meaning half or partial, conductor). Semiconductors are usually comprised of silicon, since this conducts electricity more than an insulator, such as glass, but less than a pure conductor, such ascopperor aluminum. Their conductivity and other properties can be altered with...