SI
From: The Columbia Encyclopedia, Sixth Edition
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Date: 2008
SI see International System of Units .
Author not available, SI.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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A rice mutant defective in (Si) uptake
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A Rice Mutant Defective in Si Uptakes1 Rice (Oryza sativa) accumulates silicon (Si) in the tops to levels up to 10.0% of shoot dry weight, but the mechanism responsible for high Si uptake by rice roots is not understood. We isolated ...
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Effects of Rapid Heating on Solutionizing Characteristics of Al-Si-Mg Alloys Using a Fluidized Bed
Metallurgical and Materials Transactions; 3/1/2006; Chaudhury, S K; Apelian, D; 7213 words;
... thermal expansion of Al is an order of magnitude greater than Si.[19] The thermal strain energy generated due to thermal mismatch between Al and Si is calculated using Eq. [1], and the eutectic Al grains are ... differential strain generated by thermal mismatch between Al and Si in the Al matrix of cast ...
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Microstructure and Properties of Ni^sub 3^Si Alloyed with Cr Fabricated by Self-Propagating High-Temperature Synthesis Casting Route
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The Benefits of SI Leadership after Graduation
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Abstract The benefits of Supplemental Instruction (SI) and subsequent clone programs have been well documented ... promising documentation. However, the benefits of SI leadership to undergraduate SI leaders after graduation have not been heralded thus ...
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Development of Mo(Si,Al)^sub 2^-Base Oxidation-Resistant Coating on Nb-Base Structural Materials
Metallurgical and Materials Transactions; 3/1/2005; Tabaru, Tatsuo; Kim, Jin-Hak; Shobu, Kazuhisa; Sakamoto, Michiru; Et al; 5448 words;
Mo(Si,Al)^sub 2^-base oxidation-resistant coatings ... been studied. The coating is composed of a Mo(Si, Al)^sub 2^-base Al reservoir and Al^sub 2^O ... develop a suitable Al-reservoir material, some Mo(Si^sub 0.6^,Al^sub 0.4^)^sub 2^-HfB^sub 2^ composites ...
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Determination of the Isothermal Sections of the Al-Ni-Si Ternary System at 750 °C and 850 °C
Metallurgical and Materials Transactions; 7/1/2005; Pan, X M; Jin, Z P; Zhao, J-C; 4179 words;
The phase equilibria of the A1-Ni-Si ternary system at 850 C and 750 C have been investigated using ... solid-solution phases are described: L1^sub 2^-Ni^sub 3^(A1,Si), B2-NiA1, Ni^sub 5^Si^sub 2^, δ-Ni^sub 2^Si, θ-Ni^sub 2^Si(τ^sub 4 ...
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The Influence of Alloy Composition on Precipitates of the Al-Mg-Si System
Metallurgical and Materials Transactions; 3/16/2005; Marioara, C D; Andersen, S J; Zandbergen, H W; Holmestad, R; 5804 words;
... elements affect precipitation, six Al-Mg-Si alloys aged at 175 C were investigated by ... alloys with 1.3 at. pct solute, when the Si/Mg ratio exceeds 5/6, a sharp hardness peak ... precipitates and U phases. With high Si/Mg ratios, GP zones survive for long aging ...
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Diffusion bonding of Si(3)N(4)-TiN composite with nickel-based interlayers
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The diffusion bonding of a Si^sub 3^N^sub 4^-TiN composite with Ni, INVAR ... For the chosen bonding conditions, the Si^sub 3^N^sub 4^ phase of the composite reacts ... machining. Among the new developed materials, Si^sub 3^N^sub 4^-TiN composites are some of ...
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Lack of clarity in the SI-3 debate.(diamond industry standard information)
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The controversial SI-3 clarity grade issue is placed back firmly ... Presidents Meeting to give its support to SI-3's acceptance as a grade. The opinions of ... unsurprisingly, they are split. It wasn't that the SI-3 issue had disappeared off industry's radar ...
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Microstructure and sliding-wear behavior of tungsten-reinforced W-Ni-Si metal-slicide in-situ composites
Metallurgical and Materials Transactions; 9/1/2003; Wang, H M; Luan, D Y; Cai, L X; 3045 words;
W-Ni-Si metal-silicide-matrix in-situ composites reinforced ... process. Main constitutional phases of the W/W-Ni-Si in-situ composites are the tungsten primary phase, peritectic W^sub 2^Ni^sub 3^Si, and the remaining W^sub 2^Ni^sub 3^Si/Ni^sub 31 ...
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Microstructure and Mechanical Properties of Si and Sb Added AZ91 Magnesium Alloy
Metallurgical and Materials Transactions; 8/1/2005; Srinivasan, A; Pillai, U T S; Pai, B C; 4177 words;
The effect of Si (individual and combined) with 0.2 pct Sb additions on the ... mold AZ91 alloy has been studied. The results indicate that Si addition introduces a Chinese script Mg^sub 2^Si phase at the grain boundary along with the Mg^sub 17^Al^sub ...
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Optimizaton of Mo-Si-B Intermetallic Alloys
Metallurgical and Materials Transactions; 3/1/2005; Schneibel, J H; Ritchie, R O; Kruzic, J J; Tortorelli, P F; 4293 words;
Mo-Si-B intermetallics consisting of the phases Mo^sub 3^Si and Mo^sub 5^SiB^sub 2^, and a molybdenum solid solution ... resistance would be improved. It is shown that microalloying of Mo-Si-B intermetallics with Zr and the addition of MgAl^sub 2^O^sub ...
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Microstructural Characterization of Multicomponent Nb-Ti-Si-Cr-Al-X Alloys
Metallurgical and Materials Transactions; 9/1/2006; Tewari, Raghvendra; Song, Hyo-jin; Chatterjee, Amit; Vasudevan, Vijay K; 6082 words;
Recently, alloys based on the Nb-Ti-Si system have become of interest for high ... phases: β (bcc), silicides (M^sub 5^Si^sub 3^ type), and a Cr-rich Laves phase ... alloys, refractory metals based suicides (Nb-Si, MoSi^sub 2^) exhibited better high-temperature ...
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The Influence of Strontium on Porosity Formation in Al-Si Alloys
Metallurgical and Materials Transactions; 11/1/2004; Dinnis, C M; Otte, M O; Dahle, A K; Taylor, J A; 7986 words;
... characteristics, and distribution of porosity in Al-Si castings. Although many theories have been proposed to ... plates of Sr-free and Sr-containing pure Al, Al-1 wt pct Si, and Al-9 wt pct Si alloys. Statistical significance testing was used to ...
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Si TV adds backing: EchoStar, Time Warner join investors providing $60M to Anglophone net aimed at Hispanic households.
Multichannel News; 4/12/2004; Moss, Linda; 475 words;
Si TV distributors EchoStar Communications Corp. and Time Warner ... EchoStar and Time Warner are part of a group of companies giving Si TV a funding infusion of more than $60 million. Other investors ... Partners, Llano Partners and company co-founder Barshop Venture. Si TV launched in February and is now in ...
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