Danh sách bài viết của Lê Thị Khánh Huyền

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Bài viết của Lê Thị Khánh Huyền

Cosmology and Particle Physics

Look at the sky on some clear night when you are away from city lights. There you will see thousands of individual stars and a faint glowing background of millions more. The Milky Way, as it has been called since ancient times, is an arm of our galaxy ...

Tác giả: Lê Thị Khánh Huyền viết 15:07 ngày 25/05/2018 chỉnh sửa

Production of Electromagnetic Waves

We can get a good understanding of electromagnetic waves (EM) by considering how they are produced. Whenever a current varies, associated electric and magnetic fields vary, moving out from the source like waves. Perhaps the easiest situation to visualize ...

Tác giả: Lê Thị Khánh Huyền viết 15:07 ngày 25/05/2018 chỉnh sửa

Gravitational Potential Energy

Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an ...

Tác giả: Lê Thị Khánh Huyền viết 15:07 ngày 25/05/2018 chỉnh sửa

Taste and Smell

Taste, also called gustation , and smell, also called olfaction , are the most interconnected senses in that both involve molecules of the stimulus entering the body and bonding to receptors. Smell lets an animal sense the presence of food or other ...

Tác giả: Lê Thị Khánh Huyền viết 15:06 ngày 25/05/2018 chỉnh sửa

Reconnection and Rates of Speciation

Speciation occurs over a span of evolutionary time, so when a new species arises, there is a transition period during which the closely related species continue to interact. After speciation, two species may recombine or even continue interacting ...

Tác giả: Lê Thị Khánh Huyền viết 15:06 ngày 25/05/2018 chỉnh sửa

Alternating Current versus Direct Current

Most of the examples dealt with so far, and particularly those utilizing batteries, have constant voltage sources. Once the current is established, it is thus also a constant. Direct current (DC) is the flow of electric charge in only one ...

Tác giả: Lê Thị Khánh Huyền viết 15:06 ngày 25/05/2018 chỉnh sửa

Binding Energy

The more tightly bound a system is, the stronger the forces that hold it together and the greater the energy required to pull it apart. We can therefore learn about nuclear forces by examining how tightly bound the nuclei are. We define the binding energy ...

Tác giả: Lê Thị Khánh Huyền viết 15:05 ngày 25/05/2018 chỉnh sửa

Acceleration

A plane decelerates, or slows down, as it comes in for landing in St. Maarten. Its acceleration is opposite in direction to its velocity. (credit: Steve Conry, Flickr) In everyday conversation, to accelerate means to speed up. The ...

Tác giả: Lê Thị Khánh Huyền viết 15:04 ngày 25/05/2018 chỉnh sửa

Elasticity: Stress and Strain

We now move from consideration of forces that affect the motion of an object (such as friction and drag) to those that affect an object’s shape. If a bulldozer pushes a car into a wall, the car will not move but it will noticeably change shape. A ...

Tác giả: Lê Thị Khánh Huyền viết 15:04 ngày 25/05/2018 chỉnh sửa

Biotechnology in Medicine and Agriculture

It is easy to see how biotechnology can be used for medicinal purposes. Knowledge of the genetic makeup of our species, the genetic basis of heritable diseases, and the invention of technology to manipulate and fix mutant genes provides methods to treat ...

Tác giả: Lê Thị Khánh Huyền viết 15:04 ngày 25/05/2018 chỉnh sửa

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Cosmology and Particle Physics

Production of Electromagnetic Waves

Gravitational Potential Energy

Taste and Smell

Reconnection and Rates of Speciation

Alternating Current versus Direct Current

Binding Energy

Acceleration

Elasticity: Stress and Strain

Biotechnology in Medicine and Agriculture

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