At the center of an atom is its nucleus, which has a positive electric charge. Outside the nucleus are electrons, which have a negative charge. Asteroids and comets, are objects that obey our sun, but are smaller than planets. Asteroids that pass closed to the Earth a...
The earth has a layer of gas above its surface, which helps to support life.地球表面有一层气体，有助于维持生命。Atoms are the building blocks of matter.原子是物质的组成部分。At the center of an atom is its nucleus, which has a positive electric charge.原子的中心是原子核，它带...
The incoming nuclear field is supposed to excite nucleons in a nucleus in this calculation and the nuclear excitations are approximated by particle-hole excitations in a Fermi gas. The resulting imaginary potential compares favourably with phenomenological potentials. (Atomindex citation 09:403731)Phatak...
an atom is made of nucleus containing protons and neutrons; electrons move around the nucleus. 原子中有一个原子核,原子核中包含质子和中子;电子围绕原子核运动。 Real-World Reading Link If you have ever accidentally bitten into a peach pit, you know that your teeth pass easily through the fruit,...
aDuring apoptosis, the nucleus becomes shrunken and pyknotic as a result of DNA degradation. The terminal stage of apoptosis is characterized by chromatin condensation along the nuclear margin that also coincides with DNA cleavage into small fragments 由于脱氧核糖核酸退化,在apoptosis期间,中坚力量变得收...
Atoms are the building blocks of matter.At the center of an atom is its nucleus, which has a positive electric charge.Outside the nucleus are electrons, which have a negative charge.Asteroids and comets, are objects that orbit our sun, but are smaller than planets.Asteroids that ...
The Earth is a planet that goes around the sun in a circular orbit.The Earth has a layer of gas above its surface, which helps to support life.Atoms are the building blocks of matter.At the center of an atom is its nucleus, which has a positive electric charge.Outside the...
(Because neutrons have no charge, they aren't repelled by the electrical fields at the heart of an atom and thus could be fired like tiny torpedoes into an atomic nucleus, setting off the destructive process known as fission.) Had the neutron been [-5-] in the 1920s, they note, it ...
Deserts are areas of land that receive little or no rainfall. The amount of rainfall in some deserts is so low that only a few plants can survive. A valley is low, relatively flat area between hills and mountains, often with a river running through it. ...
[-2-] the nucleus, while electrons spin around outside. [---3---] An atom with one proton is an atom of hydrogen, one with two protons is helium, with three protons is lithium, [-4-] . Each time you add a proton you get a new element. ([---5---], you will sometimes ...