Aluminium LINK集
Aluminium is a soft, durable, lightweight, malleable metal with appearance ranging from silvery to dull grey, depending on the surface roughness. Aluminium is nonmagnetic and nonsparking. It is also insoluble in alcohol, though it can be soluble in water in certain forms. The yield strength of pure aluminium is 7?11 MPa, while aluminium alloys have yield strengths ranging from 200 MPa to 600 MPa.[5] Aluminium has about one-third the density and stiffness of steel. It is ductile, and easily machined, cast, drawn and extruded.Corrosion resistance can be excellent due to a thin surface layer of aluminium oxide that forms when the metal is exposed to air, effectively preventing further oxidation. The strongest aluminium alloys are less corrosion resistant due to galvanic reactions with alloyed copper.[5] This corrosion resistance is also often greatly reduced when many aqueous salts are present however, particularly in the presence of dissimilar metals.
Aluminium has nine isotopes, whose mass numbers range from 23 to 30. Only 27Al (stable isotope) and 26Al (radioactive isotope, t1/2 = 7.2 × 105 y) occur naturally; however, 27Al has a natural abundance of 99.9+ %. 26Al is produced from argon in the atmosphere by spallation caused by cosmic-ray protons. Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. The ratio of 26Al to 10Be has been used to study the role of transport, deposition, sediment storage, burial times, and erosion on 105 to 106 year time scales.[9] Cosmogenic 26Al was first applied in studies of the Moon and meteorites.
- 痛くて耐えられない痔でお悩みの方はご参考に！
- 悩みの緑内障をチェックしよう。目の病気でお悩みなら！
- お子様の視力回復 方法をお探しの方。自宅でできるトレーニング方法です。
- 冬になって冷え性で悩んでいないでしょうか？
- 冷え性は女性の多くの人が悩まされていると聞きます。この原因と、訴状をさらにくらしく知っておきたいですね。
- ダイエットにも効果的！リンパマッサージの方法をご解説。
- 突然のぎっくり腰で動けない方や慢性的な腰痛をお持ちの方は。
- つらい坐骨神経痛でお悩みの方をナビゲート！
- アートメイクとは、目元のメイクを手軽に簡単にしたい、という考えから生まれてきた方法です。
- パチンカーの方必見！無料でパチンコ攻略法をGETしよう！
- ホームＵ
- パケ・ホーダイをご契約のお客様は、ホームUエリア内であっても、FOMAでフルブラウザ通信をご利用された場合は、通信料は有料となり、パケット通信料が高額となるおそれがありますのでご注意ください。 ... FOMA通信、ホームＵのいずれかに着信します。 ...
Copyright (C) 2009 Aluminium LINK集 All Rights Reserved.
リンク集１ リンク集２ リンク集３ リンク集４