نتایج جستجو برای: 597 ngg dw

تعداد نتایج: 7579  

Journal: :CoRR 2016
Wang Kang Yangqi Huang Xichao Zhang Yan Zhou Weifeng Lv Weisheng Zhao

—Magnetic domain-wall (DW) has been widely investigated for future memory and computing systems. However, energy efficiency and stability become two major challenges of DW-based systems. In this letter, we first propose exploiting skyrmions as on-chip and inter-chip interconnects for DW-based systems, owing to the topological stability, small size and ultra-low depinning current density. In the...

2011
Larry G. Epstein Kyoungwon Seo

The purpose of this Note is to prove a form of CLT (Theorem 1.4) that is used in Epstein and Seo (2011). More general central limit results and other applications will follow in later drafts. Let S = fB;Ng and K (S) = ffBg; fNg; fB;Ngg the set of nonempty subsets of S. Denote by s1 = (s1; s2; :::) the generic element of S1 and by n (s1) the empirical frequency of the outcome B in the …rst n exp...

Journal: :AJNR. American journal of neuroradiology 2002
Ayeesha K Kamal Alan Z Segal Aziz M Uluğ

BACKGROUND AND PURPOSE The risk of stroke after a transient ischemic attack (TIA) is high. Appropriately directed therapies may reduce this risk. However, sensitive means of detecting the presence of subtle neuronal ischemia are lacking. We investigated the potential use of quantitative diffusion-weighted (DW) MR imaging in the detection of deficits produced by transient cerebral ischemia. ME...

2001
Dimitri Theodoratos Theodore Dalamagas Alkis Simitsis Manos Stavropoulos

A Data Warehouse (DW) can be used to integrate data from multiple distributed data sources. A DW can be seen as a set of materialized views that determine its schema and its content in terms of the schema and the content of the data sources. DW applications require high query performance. For this reason, the design of a typical DW consists of selecting views to materialize that are able to ans...

Neda Mehdipour, Neda Sheijooni Fumani, Reza Rahnama,

The nutritional values of the three Caspian Sea macroalgae species, Cladophora glomerata, Enteromorpha intestinalis and Laurencia caspica were evaluated based on proximate and fatty acid composition. The investigated species demonstrated low lipid composition (0.20±0.03- 1.62±0.26 % DW) and high carbohydrate (21.70±0.17-26.1±1.27%DW) and protein contents (13.34±2.41-28.08±0.51%DW). The as...

2010
P. Yan Z. Z. Sun J. Schliemann X. R. Wang

One of the important issues in nanomagnetism is to lower the current needed for a technologically useful domain wall (DW) propagation speed. Based on the modified LandauLifshitz-Gilbert (LLG) equation with both Slonczewski spin-transfer torque and the field-like torque, we derive an optimal temporally and spatially varying spin current pattern for fast DW propagation along nanowires. Under such...

Journal: :CoRR 2010
Nouha Arfaoui Jalel Akaichi

Nowadays, Data Warehouse (DW) plays a crucial role in the process of decision making. However, their design remains a very delicate and difficult task either for expert or users. The goal of this paper is to propose a new approach based on the clover model, destined to assist users to design a DW. The proposed approach is based on two main steps. The first one aims to guide users in their choic...

2009
K. L. MILLER G. DOUAUD S. JBABDI T. E. BEHRENS J. A. MCNAB

Figure 2: Tractography of the corticospinal tract (CST) for SE and SSFP with identical thresholding (1000 fibers). Tracts reach the cortex more reliably in SSFP, whereas the SE tracts end where the CST crosses the superior longitudinal facsciculus (SLF) and CC. Signal (% M0) Readout efficiency SNR efficiency DW-SE 5.15 % 6.73% 1.33% DW-SSFP 3.45 % 32.65% 1.97% Table 1: Signal for optimized DW-S...

2009
R. Stirnberg T. Stöcker N. Shah

Introduction: It was recently shown that a diffusion weighted Single-shot Stimulated Echo Acquisition Mode (DW ss-STEAM) pulse sequence is an alternative to the standard DW EPI at high fields [1-3]. By designing variable flip angles (vFA) for centric k-space acquisition without RF spoiling, more signal is utilised than usual. The iterative vFA-algorithm is based on the Extended Phase Graph form...

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