Results 161 to 170 of about 48,440 (236)
Anomalous temperature behaviour of the shear elastic constant C44 in tantalum
Solid State Communications, 1980 Abstract The adiabatic elastic constants of a pure vanadium single crystal have been measured between 300 and 2100 K in a suitable geometry by means of an ultrasonic method. We find that the shear constant C44 has an anomalous temperature behaviour very similar to that found in niobium.
E. Walker, P. Bujard
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Stereoselective synthesis of the C33–C44 fragment of palau’amide
Tetrahedron Letters, 2008 Abstract An efficient stereoselective synthesis of the C33–C44 fragment of palau’amide is described using a Sharpless asymmetric epoxidation, a regioselective nucleophilic ring opening of the epoxide, a Grignard reaction and a Luche stereoselective reduction of a keto compound as the key steps.
Debendra K. Mohapatra, Sabita Nayak
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Synthetic Strategy toward the C44–C65 Fragment of Mirabalin
Organic Letters, 2014A convergent and flexible stereoselective synthesis of one isomer of the C44-C65 fragment of mirabalin is described. The key steps include organocatalytic aldolization, ruthenium-catalyzed asymmetric hydrogenation, amide formation, Marshall stereoselective allenylation, and the Nozaki-Hiyama-Kishi reaction.
Echeverria, Pierre-Georges +8 more
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Shear Elastic Constant C44 and Phase Transformation of KCl
Nature, 1973THE shear elastic constant C44 for KCl, KF and the rubidium halides is of special interest because it decreases with pressure. Born1 and Misra2 pointed out that a vanishing shear elastic constant is a sufficient condition for a phase transformation.
Chi‐yuen Wang
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Synthetic studies on spongistatins: synthesis of the C29–C44 fragment
Tetrahedron Letters, 2000Abstract A convergent synthesis of the C29–C44 fragment, the common subunit of the spongipyran macrolides is described. The key step of the synthesis is the C -glycosidation reaction which is based on coupling of the lithiated F-ring sulfone with the E-ring aldehyde, and subsequent reductive desulfonylation to afford the E–F bis (pyran) with high ...
Samadi, M. +3 more
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A Method for Constructing the C44−C51 Side Chain of Altohyrtin C
Organic Letters, 1999[formula: see text] A method to construct the C44-C51 side chain of altohyrtin C has been developed and applied to a model aldehyde derived from D-glucose. The approach relies on a Wittig reaction to couple the side chain to an aldehyde and utilizes an allylic diazene rearrangement to place the C45 double bond in the correct position.
G R, Ott, C H, Heathcock
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C44. Secure cooperative blindly-optimized compressive spectrum sensing for cognitive radio
2012 29th National Radio Science Conference (NRSC), 2012In this paper, we propose a reduced complexity secure cooperative cognitive radio spectrum sensing algorithm for wideband systems. The proposed scheme aims to reduce the receiver hardware complexity by minimizing the required sampling rates. The proposed scheme is immune to spectrum sensing data falsification attacks.
Mohammed Farrag +2 more
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The Role of Softening in Elastic Constant c44 in Martensitic Transformation
Scripta Materialia, 1998In the present paper, the authors show that the puzzling monoclinic distortion in TiNi martensite B19{prime} has a simple origin. It is due to the softening of {l_brace}001{r_brace} shear modulus c{sub 44} (which is also the {l_brace}001{r_brace} shear modulus by definition), which leads to a correlation of this shear mode with that of basal shear ...
Xiaobing Ren, Kazuhiro Otsuka
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