نتایج جستجو برای: dc polarization
تعداد نتایج: 121474 فیلتر نتایج به سال:
Spin-polarization response functions are examined for high-energy (−→e , e′−→p ) reaction by computing the full 18 response functions for the proton kinetic energy Tp′ = 0.515 GeV and 3.179 GeV with an 16O target. The Dirac eikonal formalism is applied to account for the final-state interactions. The formalism is found to yield the response functions in good agreement with those calculated by t...
Early experiments on spin-blockaded double quantum dots revealed robust, large-amplitude current oscillations in the presence of a static (dc) source-drain bias. Despite experimental evidence implicating dynamical nuclear polarization, the mechanism has remained a mystery. Here we introduce a minimal albeit realistic model of coupled electron and nuclear spin dynamics which supports self-sustai...
The boundary–value problem of the reflection and transmission of a plane wave due to a slab of an electro–optic structurally chiral material (SCM) is formulated in terms of a 4×4 matrix ordinary differential equation. The SCM slab can be locally endowed with one of 20 classes of point group symmetry, and is subjected to a dc voltage across its thickness. The enhancement (and, in some cases, the...
In order to minimize the influence of electrode polarization and noise in impedance measurements, especially in the low frequency region, current injection shows several advantages compared to voltage application. Although the existence of a great variety of current sources, they meet our requirements only partially. We developed a voltage controlled current source for active front ends for a w...
Nonlinear and nonequilibrium electrophoresis of spherical particles of radius a is shown to be possible when the solid surface allows field or current penetration. At low particle Peclet numbers, transient capacitative charging occurs until the surface polarization completely screens the external field. For a DC applied field [see text], the resulting electrokinetic velocity reaches Dukhin's ma...
T follicular helper cells (Tfh) are important regulators of humoral responses. Human Tfh polarization pathways have been thus far associated with Th1 and Th17 polarization pathways. How human Tfh cells differentiate in Th2-skewed environments is unknown. We show that thymic stromal lymphopoietin (TSLP)-activated dendritic cells (DCs) promote human Tfh differentiation from naive CD4 T cells. We ...
The SLAC polarized electron source employs a photocathode DC high voltage gun with a loadlock and a YAG pumped Ti:sapphire laser system for colliding beam experiments or a flash lamp pumped Ti:sapphire laser for fixed target experiments. It uses a thin, strained GaAs(100) photocathode, and is capable of producing a pulsed beam with a polarization of ≥80% and a peak current exceeding 10 A. Its o...
The Multiangle SpectroPolarimetric Imager (MSPI) is a new type of polarimetric camera jointly designed and fabricated by the University of Arizona and the Jet Propulsion Laboratory. Developed for aerosol measurements from space, MSPI is well-suited for a variety of Stokes imaging applications from the UV through the Visible, NIR, and SWIR which demand polarimetric precision of better than 0.5% ...
وابستگی شدید جوامع صنعتی به منابع انرژی بخصوص انرژی الکتریکی از یک طرف و رو به اتمام بودن سوخت های فسیلی از طرف دیگر، لزوم انتخاب جایگزین های مناسب برای این منابع را ایجاب می کند. یکی از بهترین گزینه ها، استفاده از انرژی های تجدید پذیر مانند انرژی خورشید می-باشد. مرسوم ترین روش برای تبدیل انرژی خورشید به انرژی الکتریکی استفاده از سلول ها یا پنل های خورشیدی است. از طرفی در سیستم های خورشیدی، سطح...
هدف از اجرای این پروژه تحلیل، طراحی و ساخت نمونه ای از مبدل های هیبرید سوئیچینگ کاهنده dc-dc می باشد. این مبدل قادر است نسبت تبدیل های خیلی کوچک، که در حال حاضر تنها با استفاده از ترانسفورماتورها قابل دستیابی هستند را بدون استفاده از ترانس و بدون وارد شدن به بازه بحرانی سیکل کار (duty cycle) تولید کند. تحقیقات گذشته تنها نسبت تبدیل این مبدل در مد هدایت پیوسته را ارائه داده است، در این پروژه مقا...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید