نتایج جستجو برای: stone wales defect
تعداد نتایج: 137725 فیلتر نتایج به سال:
With a hexagonal monolayer network of carbon atoms, graphene has demonstrated exceptional electrical and mechanical properties. In this work, the fracture of graphene sheets with Stone-Wales type defects and vacancies were investigated using molecular dynamics simulations at different temperatures. The initiation of defects via bond rotation was also investigated. The results indicate that the ...
We propose a new microscopic mechanism to explain the unusually fast fusion process of carbon nanotubes. We identify the detailed pathway for two adjacent (5,5) nanotubes to gradually merge into a (10,10) tube, and characterize the transition states. The propagation of the fused region is energetically favorable and proceeds in a morphology reminiscent of a Y junction via a zipper mechanism, in...
شب پره مینوز گوجه فرنگی tuta absoluta (meyrick)، به عنوان یکی از آفات مهم خانواده solanaceae، به ویژه گوجه فرنگی در چند سال اخیر شناخته شده است که بر عملکرد، کیفیت و بازارپسندی محصول تاثیر بسیار زیادی دارد. کنترل آفت با استفاده از آفت کش ها، به دلیل زیست شناسی، رفتار و طی دوره ی لاروی درون دالان های گیاه، و همچنین مقاومت آن نسبت به آفت کش های رایج، مشکل است. در این تحقیق مقاومت برخی از ارقام گو...
BACKGROUND Spontaneous perinephric hematoma (SPH) secondary to a forniceal rupture as the first presenting sign for an obstructive ureteral stone in a patient without history of urolithiasis has not been described previously. CASE PRESENTATION We report a 70-year-old Caucasian male patient who presented to our emergency room with fever, altered mental status, and left flank pain. He had a tem...
We discover two distinct topological pathways through which the pentagonal Cairo tiling (P5), a structural model for single-layer $A{B}_{2}$ pyrite materials, respectively transforms into crystalline rhombus-hexagon (C46) and random rhombus-pentagon-hexagon (R456) tilings, by continuously introducing Stone-Wales (SW) defects. find these transformations are controlled orientation correlations am...
Key words: bone mineral density; hypercalciuria; panied by decreased osteoblastic surfaces, while others, have reported reduced bone formation, increased bone osteoporosis; renal stone disease; urolithiasis resorption and a severe mineralization defect [4]. In a recent retrospective analysis of bone mineral density by dual X-ray absorptiometry, we compared a
1. The demonstration of an inheritable anomaly of erythrocyte oxalate transport in 'primary' calcium nephrolithiasis suggested that this disease might be a generalized metabolic disorder characterized by a defect in cellular anion transport. 2. To determine whether this anomaly is restricted to oxalate alone, we studied erythrocyte transmembrane urate self-exchange in calcium-oxalate renal ston...
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