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Electromagnetic Radiation 电磁辐射

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays. In the modern w...

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Colored Pencils 彩铅

There’s a lot to like about drawing with colored pencils. They’re utterly convenient—a handful of colored pencils and a pad of paper are all you really need to start creating. Prep time and cleanup are practically non-issues, the materials are light and portable, and you don’t need messy or toxic solvents. At the same time, colored pencil drawin...

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Inception 盗梦空间

A thief who steals corporate secrets through the use of dream-sharing technology is given the inverse task of planting an idea into the mind of a C.E.O. Storyline Dom Cobb is a skilled thief, the absolute best in the dangerous art of extraction, stealing valuable secrets from deep within the subconscious during the dream state, when the mind i...

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Nunchaku 双截棍

The Handcrafted Nunchaku or nunchucks (Japanese: ヌンチャク nunchaku, often “nunchuks“, “chainsticks“, “chuka sticks” or “karate sticks” in English) is a traditional Okinawan martial arts weapon consisting of two sticks connected at one end by a short chain or rope. The two sections of the weapon are commonly made out of wood, while the link is a cor...

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Pencil Sketch 素描

A pencil is an implement for writing or drawing, constructed of a narrow, solid pigment core in a protective casing that prevents the core from being broken or marking the user’s hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface. They are distinct from pens, ...

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Oil Painting 油画

Oil painting is the process of painting with pigments with a medium of drying oil as the binder. Commonly used drying oils include linseed oil, poppy seed oil, walnut oil, and safflower oil. The choice of oil imparts a range of properties to the oil paint, such as the amount of yellowing or drying time. Certain differences, depending on the oil,...

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Fast Fourier Transform 快速傅立叶变换

The fast fourier transform or FFT is without exaggeration one of the most important algorithms created in the last century. So much of the modern technology that we have today such as wireless communication, GPS and in fact anything related to the vast field of signal processing relies on the insights of the FFT. But it’s also one of the mo...

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Baduk 围棋入门 4.0

胡翼飞 的围棋入门视频。 主要内容:一步棋的价值、收官的顺序、手动判定胜负、实战中的收官。 收官,又称作“官子”,是围棋比赛中三个阶段(布局、中盘、官子)中的最后一个阶段, 指双方经过中盘的战斗,地盘及死活已经大致确定之后,确立竞逐边界的阶段。 双方先手官子 无论谁下都是先手,则为双先官。因为谁先走谁无条件得利,所以双先官只要能走到就是最大的官子。 先手官和逆收官 一方走是先手,一方走是后手,先手的一方叫先手官,后手的一方叫逆收官。先手官和逆收官往往是同一个官子,大小也一样,只是称呼的对象不一样而已。先手和逆收官可以简单的理解为两倍后手官的价值。 后手官 无论谁下都是后手,即双方都是后手时,称为后手官。也可以理解为双方后手官的简称。当我们一般说官子的价值时,默认都是按后...

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