A C U P R E S S U R E.
نویسندگان
چکیده
منابع مشابه
Refinement of the Nacrite S T R U C T U R E
Nacrite crystals from a vug within a matrix ofdickite at Red Mountain near Silverton, Colorado, have a = 8.906(2), b = 5.146(1), c = 15.664(3)/~,,/3 = 113.58(3) ~ V = 657.9(3)/~3, and space group Cc. The structure was solved by direct methods to determine phase angles, followed by electron density maps to locate all atoms. Refinement by least-squares ceased at R = 4.5%. Each 7/~ layer has struc...
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-The crystal structure of Keokuk kaolinite, including all H atoms, was refined in space group C1 using low-temperature (1.5 K) neutron powder diffraction data (~ = 1.9102 A) and Rietveld refinement/ difference-Fourier methods to R,,,p = 1.78%, reduced x 2 = 3.32. Unit-cell parameters are: a = 5,1535(3) /~, b = 8.9419(5) &, c = 7.3906(4) &, a = 91.926(2) ~ = 105.046(2) ~ 7 = 89-797(2) ~ and V= 3...
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t h e s p e c i a l c o n c e n t r i c a l l y b r a c e d f r a m e (s c b f) i s a c o m m o n t y p e o f s t e e l s t r u c t u r a l s y s t e m f o r r e s i s t i n g l a t e r a l l o a d i n g. t h i s t y p e o f s y s t e m p r o v i d e s t h e r e q u i r e d s t i f f n e s s a n d s t r e n g t h a t r e l a t i v e l y l o w c o s t. d e s i g n c o d e s, b a s e d o n p a s ...
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ژورنال
عنوان ژورنال: The Lancet
سال: 1867
ISSN: 0140-6736
DOI: 10.1016/s0140-6736(02)51444-6