Crystal Dislocations with Different Orientations and Collisions

Crystal Dislocations

Crystal dislocations were invisible until the mid-20th century although their presence had been inferred; the atomic and molecular scale dimensions had prevented earlier discovery. Now they are normally known to be just about everywhere, for example, in the softest molecularly-bonded crystals as well as within the hardest covalently-bonded diamonds. The advent of advanced techniques of atomic-s...

synthesis and dna interaction studies of new cobalt (ii) complexes containing different dinitrogen aaromatic ligands with calf thymus dna using different spectroscopy methods

در این مطالعه بر هم کنش این چهار کمپلکس با dna تیموس گوساله توسط روش های اسپکتروفتومتری، فلوریمتری، دو رنگ نمائی دورانی، و ویسکوزیمتری بررسی شدند تا اثر استخلاف های متیل بر روی لیگاندهای فنانترولین بررسی گردد.

Evaluation of Vascular Injuries Associated with Different Kinds of Traumatic Knee Dislocations

In a chart review 31 traumatic knee dislocations were identified in 30 patients during an eight year period (1992-2000).Fifteen dislocations (48.4%) were posterior,seven anterior,eight occult and one medial.out of the five cases of vascular injuries three happened with posterior dislocations and in four patients associated ipsilateral limb injuries were present .the general incidence of simulta...

Nets with collisions (unstable nets) and crystal chemistry.

Nets in which different vertices have identical barycentric coordinates (i.e. have collisions) are called unstable. Some such nets have automorphisms that do not correspond to crystallographic symmetries and are called non-crystallographic. Examples are given of nets taken from real crystal structures which have embeddings with crystallographic symmetry in which colliding nodes either are, or a...

Twisted topological solitons and dislocations in a polymer crystal