WebCarbon (from Latin carbo 'coal') is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—its atom making four electrons available to form covalent chemical bonds.It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust. Three isotopes occur naturally, 12 C and 13 C being …

WebThe açaí palm (/ ə ˈ s aɪ. iː /, Portuguese: (), from Nheengatu asai), Euterpe oleracea, is a species of palm tree cultivated for its fruit (açaí berries, or simply açaí), hearts of palm (a vegetable), leaves, and trunk wood. Global demand for the fruit has expanded rapidly in the 21st century, and the tree is cultivated for that purpose primarily

Web松原 正樹（まつばら まさき、1954年 6月27日 - 2016年 2月8日）は、日本のギタリスト、作曲家、アレンジャー 。 福井県 越前市（旧武生市）出身 。 ヤマハ・ネム音楽院（現・ヤマハ音楽院）出身。妻はキーボーディストで作曲家の南部昌江 。

Web電子（でんし、羅: 西: 英: electron ）とは、宇宙を構成するレプトンに分類される素粒子である。 素粒子標準模型では、第一世代の荷電レプトンに位置付けられる。 電子はスピン 1/2 のフェルミ粒子であり、電荷は −1 である。 ワインバーグ＝サラム理論における弱アイソスピンと弱超電荷は ...

WebActivated carbon, also called activated charcoal, is a form of carbon commonly used to filter contaminants from water and air, among many other uses. It is processed (activated) to have small, low-volume pores that increase the surface area available for adsorption (which is not the same as absorption) or chemical reactions. Activation is analogous to making …

WebIn chemistry, a hydrogen bond (or H-bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is covalently bound to a more electronegative "donor" atom or group (Dn), and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac). Such an interacting system is generally denoted …

WebInfrared spectroscopy (IR spectroscopy or vibrational spectroscopy) is the measurement of the interaction of infrared radiation with matter by absorption, emission, or reflection.It is used to study and identify chemical substances or functional groups in solid, liquid, or gaseous forms. It can be used to characterize new materials or identify and verify known …

WebAlhazen's most famous work is his seven-volume treatise on optics Kitab al-Manazir (Book of Optics), written from 1011 to 1021. In it, Ibn al-Haytham was the first to explain that vision occurs when light reflects from an object and then passes to one's eyes, and to argue that vision occurs in the brain, pointing to observations that it is subjective and affected by …

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WebLa ideología religiosa del Califato fatimí tuvo su origen en un movimiento chií ismailita. [3] El surgimiento de la dinastía se debió al éxito de la prédica de un proselitista chiita a finales del siglo IX, Abu Abd Allah, que se estableció entre los bereberes kutama en el año 893, a algunos de los cuales había conocido en La Meca. [4] [3] Los kutama, monteñeses de la …