Role of screening, heating, and dielectrics on high-field transport in graphene

2012 ◽  
Author(s):  
Andrey Y. Serov ◽  
Zhun-Yong Ong ◽  
Vincent E. Dorgan ◽  
Eric Pop
Keyword(s):  
High Field

Role of high-field MR in studies of localized prostate cancer

2013 ◽  
Vol 27 (1) ◽  
pp. 67-79 ◽  
Author(s):  
Miriam W. Lagemaat ◽  
Tom W. J. Scheenen
Keyword(s):  
Prostate Cancer ◽  
High Field ◽  
Localized Prostate Cancer ◽  
High Field Mr

The role of N-acetylcysteine in protecting synovial fluid biomolecules against radiolytically-mediated oxidative damage: A high field proton NMR study

1999 ◽  
Vol 30 (5) ◽  
pp. 351-369 ◽  
Author(s):  
Martin Grootveld ◽  
Christopher J.L. Silwood ◽  
Edward J. Lynch ◽  
Ismail Y. Patel ◽  
David R. Blake
Keyword(s):  
Synovial Fluid ◽  
Oxidative Damage ◽  
High Field ◽  
Proton Nmr ◽  
Nmr Study

scholarly journals Monte Carlo Simulations of High Field Transport in Electroluminescent Devices

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 401-405
Author(s):  
Manfred Dür ◽  
Stephen M. Goodnick ◽  
Martin Reigrotzki ◽  
Ronald Redmer
Keyword(s):  
Band Structure ◽  
High Field ◽  
Light Emission ◽  
Essential Element ◽  
Impact Excitation ◽  
Field Energy ◽  
Pseudopotential Calculations ◽  
Full Band ◽  
Full Band Structure

High field transport in phosphor materials is an essential element of thin film electroluminescent device performance. Due to the high accelerating fields in these structures (1–3 MV/cm), a complete description of transport under high field conditions utilizing information on the full band structure of the material is critical to understand the light emission process due to impact excitation of luminescent impurities. Here we investigate the role of band structure for ZnS, GaN, and SrS based on empirical pseudopotential calculations to study its effect on the high field energy distribution of conduction band electrons.

Cation and Water Interactions in the Interlamellae of a Smectite Clay

1997 ◽  
Author(s):  
Andrea Labouriau ◽  
Cliff T. Johnston
Keyword(s):  
Nmr Spectroscopy ◽  
High Field ◽  
Model Systems ◽  
Strong Interactions ◽  
Chemical Information ◽  
Nmr Studies ◽  
Humic Materials ◽  
Structural Metals ◽  
And Diffusion

Advances in NMR instrumentation and availability have led to increased application to mineral systems and to environmental problems. The sensitivity of high-field NMR systems is nearly sufficient to work at real environmental concentrations. Even with limited sensitivity, the amount of chemical information obtained through NMR spectroscopy makes it a very valuable technique in many model systems. The application of NMR spectroscopy in mineral systems has been primarily limited to studies of the structural metals aluminum and silicon. However, in recent years there have been several publications on mobile cations in minerals, including work on the exchangeable cations in clays. Our interests lie in understanding the sorption of cations in clays, the structural sites available for that sorption, and the role of water in cation–clay interactions. Our goal is to eventually understand the molecular interactions that determine the adsorption and diffusion of cations in clays and, thus, the role of clays in determining cation transport through the geosphere. This fundamental understanding has applications in the fate of heavy metals, radionuclides, and even the mobility of nutrients for plants. It is well known that there are very strong interactions between metals and humic materials and these are also strong contributors to cation mobility. However, for simplicity, we have chosen to focus on the interactions of mobile metal ions with well-characterized clays. An NMR-based approach to this problem can take two complementary directions: first, studies of the structural components of clays such as 29Si and 27Al NMR as a function of cation or hydration; second, NMR studies of probe molecules—which in this case are the cations themselves. High magnetic field, multinuclear NMR spectrometers make it quite possible to study various “uncommon” nuclei with relative ease. It is our experience that using the cations as probe nuclei for studying sorption phenomena yields more information than studies of structural nuclei. This chapter is basically a report of work in progress on several systems that are starting to yield interesting results, which it is hoped will lead to a general understanding of these complex systems.

Role of anisotropy on high field transitions in ferrimagnetic free particles

1995 ◽  
Vol 140-144 ◽  
pp. 1519-1520 ◽  
Author(s):  
G. Asti ◽  
M. Solzi ◽  
F. Bolzoni ◽  
F. Albertini
Keyword(s):  
High Field ◽  
Free Particles

Intraoperative Visualization of Residual Tumor: The Role of Perfusion-Weighted Imaging in a High-Field Intraoperative Magnetic Resonance Scanner

2013 ◽  
Vol 72 (2) ◽  
pp. ons151-ons158 ◽  
Author(s):  
Constantin Roder ◽  
Benjamin Bender ◽  
Rainer Ritz ◽  
Jürgen Honegger ◽  
Günther Feigl ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Hot Spots ◽  
High Field ◽  
Cerebral Blood Volume ◽  
Residual Disease ◽  
Region Of Interest ◽  
Residual Tumor ◽  
Tumor Margins ◽  
Perfusion Maps

AbstractBACKGROUND:High-field, intraoperative magnetic resonance imaging (iMRI) achieves free tumor margins in glioma surgery by involving anatomic neuronavigation and sophisticated functional imaging.OBJECTIVE:To evaluate the role of perfusion-weighted iMRI as an aid to detect residual tumor and to guide its resection.METHODS:Twenty-two patients undergoing intraoperative scanning (in a dual-room 1.5-T magnet setting) during the resection of high-grade gliomas were examined with perfusion-weighted iMRI. The generated relative cerebral blood volume (rCBV) maps were scrutinized for any hot spots indicative of tumor remnants, and region-of-interest analysis was performed. Differences among the rCBV region-of-interest estimates in residual tumor, free tumor margins, and normal white matter were analyzed. Histopathology of the tissue specimens and the neurosurgeon's intraoperative macroscopic estimations were considered the reference standards.RESULTS:In all cases, diagnostic rCBV perfusion maps were generated. Interpretation of perfusion maps demonstrated that gross total resection of gliomas was achieved in 4 of 22 cases (18%), which was macroscopically and histopathologically verified, whereas in 18 of 22 cases (82%), the perfusion-weighted iMRI revealed hot spots indicating subtotal tumor removal. The latter proved to be true in all but 1 case. The receiver-operating characteristic curves of the qualitative visual and quantitative analyses showed excellent sensitivity and specificity rates. Statistical analysis demonstrated statistically significant differences for the mean rCBV and maximum rCBV between residual disease and tumor-free margins (P = .002 for both).CONCLUSION:Perfusion-weighted iMRI may be implemented easily into imaging protocols and may assist the surgeon in detecting residual tumor volume.

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