نتایج جستجو برای: chiral omega
تعداد نتایج: 64449 فیلتر نتایج به سال:
We show that the Raman scattering technique can give complete structural information for one-dimensional systems, such as carbon nanotubes. Resonant confocal micro-Raman spectroscopy of an (n,m) individual single-wall nanotube makes it possible to assign its chirality uniquely by measuring one radial breathing mode frequency omega(RBM) and using the theory of resonant transitions. A unique chir...
لوله ورتکس یک وسیله ساده مکانیکی است که فاقد قسمت های متحرک بوده ویکی از تجهیزات مورد استفاده در سیستم تبرید می باشد، که در آن یک سیال پرفشار از طریق نازل های ورودی وارد لوله ورتکس شده و به دو جریان با دمای کمتر، و بیشتر از دمای ورودی منشعب می شودبدین صورت می توان دماهای تا 40- درجه سلسیوس را ایجاد کرد.اگرچه با وجود اینکه تاکنون مطالعات تجربی زیادی بر روی عملکرد لوله ورتکس صورت گرفته است اما هم...
Using fundamental electromagnetic properties of metasurfaces, we build a platform to classify reciprocal bianisotropic metasurfaces from typical experimental measurements and determine isotropic, anisotropic, bi-isotropic (chiral), (so-called omega) properties. We provide guidelines identify each class by measuring macroscopic scattering parameters, that is, reflection transmission coefficients...
A weak perpendicular magnetic field, $B$, breaks the chiral symmetry of each valley in electron spectrum graphene, preserving overall Brillouin zone. We explore consequences this breaking for interaction effects graphene. In particular, we demonstrate that electron-electron lifetime acquires an anomalous $B$ dependence. Also, ballistic zero-bias anomaly, $\ensuremath{\delta}\ensuremath{\nu}(\en...
We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b') each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp collisions collected by the CDF II detector at Fermilab with an integ...
It has been known for some time that the Boltzmann weights of the chiral Potts model can be parametrized in terms of hyperelliptic functions, but as yet no such parametrization has been applied to the partition and correlation functions. Here we show that for N = 3 the function S(t p) that occurs in the recent calculation of the order parameters can be expressed quite simply in terms of such a ...
Recent experiments in the topological Weyl semimetal TaAs have observed record-breaking second-harmonic generation, a non-linear optical response at $2\omega$ generated by an incoming light source $\omega$. However, whether generation is enhanced semimetals general challenging open question because their band structure entangles contributions arising from trivial bands and crossings. In this wo...
We take an approach to the Λ non-mesonic weak decay in nuclei based on the exchange of mesons. The one pion and one kaon exchange are considered, together with the exchange of two pions, either correlated, leading to an important scalar-isoscalar exchange (σ-like exchange), or uncorrelated (box diagrams). Extra effects of omega exchange in the scalar-isoscalar channel are also considered. Const...
A hexafullereno-diporphyrinoid was obtained in a sequence of cycloaddition steps using porphyrins programmed for [4+2]-cycloaddition reactions and C(60)-fullerene.
carbon nanotubes (cnts) are specific structures with valuable characteristics. in general, the structure of each nanotube is defined by a unique chiral vector. in this paper, different structures of short single-walled cnts are simulated and their mechanical properties are determined using finite element method. for this aim, a simple algorithm is presented which is able to model the geometry o...
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