極小曲面是微分幾何學裏最重要的研究對象之一…
Tag: science-community
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气凝胶 — 由空气构成的物质及其特性
在1931年，美国化学工程师Samuel Stephens Kistler博士与同事Charles Learned博士打赌，说他们可以把啫喱内的液体换成气体而不会使它塌陷。他们把这个概念称为「气凝胶」，并最终使用二氧化矽造出史上第一块气凝胶 …
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氣凝膠 — 由空氣構成的物質及其特性
在1931年，美國化學工程師Samuel Stephens Kistler博士與同事Charles Learned博士打賭，說他們可以把啫喱內的液體換成氣體而不會使它塌陷。他們把這個概念稱為「氣凝膠」，並最終使用二氧化矽造出史上第一塊氣凝膠 …
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Aerogel – An Air-Based Material and Its Exciting Properties
In 1931, an American chemical engineer, Dr Samuel Stephens KISTLER bet his colleague, Dr Charles LEARNED, that they could replace the liquid inside a jelly with gas without shrinking it. Dubbing this concept “aerogel”, they managed to make the first aerogel with silica …
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Seeing the Inside World through Inverse Problems
In many problems in science and technology, we are able to collect measurements and are interested in inferring useful information about the system, say certain physical parameters that can cause the effect (the measurements). Such a problem is termed an inverse problem because it starts with the effects and then calculates the causes…
