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Size reduction of complex networks preserving modularity

Description: The ubiquity of modular structure in real-world complex networks is being the focus of attention in many trials to understand the interplay between network topology and functionality. The best approaches to the identification of modular structure are based on the optimization of a quality function known as modularity. However this optimization is a hard task provided that the computational complexity of the problem is in the NP-hard class. Here we propose an exact method for reducing the size o… more
Date: December 24, 2008
Creator: Arenas, A.; Duch, J.; Fernandez, A. & Gomez, S.
Partner: UNT Libraries Government Documents Department
open access

Accelerator Challenges and Opportunities for Future Neutrino Experiments

Description: There are three types of future neutrino facilities currently under study, one based on decays of stored beta-unstable ion beams (?Beta Beams?), one based on decays of stored muon beams (?Neutrino Factory?), and one based on the decays of an intense pion beam (?Superbeam?). In this paper we discuss the challenges each design team must face and the R&D being carried out to turn those challenges into technical opportunities. A new program, the Muon Accelerator Program, has begun in the U.S. t… more
Date: December 24, 2010
Creator: Zisman, Michael S
Partner: UNT Libraries Government Documents Department
open access

Environmental Degradation of Materials for Nuclear Waste Repositories Engineered Barriers

Description: Several countries are considering geological repositories for the storage of nuclear waste. Most of the environments for these repositories will be reducing in nature, except for the repository in the US, which is going to be oxidizing. For the reducing repositories, alloys such as carbon steel, copper, stainless steels and titanium are being evaluated. For the repository in the US, some of the most corrosion resistant commercially available alloys are being investigated. This paper presents a … more
Date: December 24, 2006
Creator: Rebak, R B
Partner: UNT Libraries Government Documents Department
open access

Progress on a Be Cavity Design

Description: Previous RF experiments with normal-conducting cavities have demonstrated that there is a significant degradation in maximum gradient when the cavity is subjected to a strong axial magnetic field. We have developed a model suggesting that a cavity with beryllium walls may perform better than copper cavities. In this paper we outline the issues that led us to propose fabricating a Be-wall cavity. We also discuss a concept for fabricating such a cavity and mention some of the manufacturing issues… more
Date: December 24, 2010
Creator: Li, D.; Palmer, R.; Stratakis, D.; Virostek, S. & Zisman, Michael S.
Partner: UNT Libraries Government Documents Department
open access

Effects of gradient distribution and aggregate structure of fibers on the flexibility and flexural toughness of natural moso bamboo (Phyllostachys edulis)

Description: Article is a study proposing an original method to quantitatively evaluate the gradient distribution and aggregate structure of fibers on the flexibility and flexural toughness of natural moso (Phyllostachys edulis) bamboo, with a comparison to two other natural woods.
Date: December 24, 2021
Creator: Wei, Xin; Wang, Ge; Smith, Lee M.; Chen, Xiaoyi & Jiang, Huan
Partner: UNT College of Engineering
open access

Self-Assembly Techniques for Nanofabrication

Description: Article introduces a special issue of the Journal of Nanomaterials that addresses the research studies on fabrication, processing, and applications of self-assembled nanostructures.
Date: December 24, 2013
Creator: Kajbafvala, Amir; Bahmanpour, Hamed; Maneshian, Mohammad H. & Li, Minghang
Partner: UNT College of Engineering

Enthalpies of solution and enthalpies of solvation of organic solutes in ethylene glycol at 298.15 K: prediction and analysis of intermolecular interaction contributions

Description: This article studies thermochemistry of solvation of inert gases and organic solutes in ethylene glycol was thoroughly studied using solution calorimetry technique.
Date: December 24, 2016
Creator: Stolov, Mikhail; Zaitseva, Ksenia V.; Varfolomeev, Mikhail A. & Acree, William E. (William Eugene)
Partner: UNT College of Arts and Sciences
open access

Development of GaAs-Based Monolithic Surface Acoustic Wave Devices for Chemical Sensing and RF Filter Applications

Description: Since their invention in the mid-1960's, surface acoustic wave (SAW) devices have become popular for a wide variety of applications. SAW devices represent a low-cost and compact method of achieving a variety of electronic signal processing functions at high frequencies, such as RF filters for TV or mobile wireless communications [1]. SAW devices also provide a convenient platform in chemical sensing applications, achieving extremely high sensitivity to vapor phase analytes in part-per-billion c… more
Date: December 24, 1998
Creator: Baca, A. G.; Casalnuovo, S. A.; Drummond, T. J.; Frye, G. C.; Heller, E. J.; Hietala, V. M. et al.
Partner: UNT Libraries Government Documents Department
open access

A polar insect's tale: Observations on the life cycle of Parochlus steinenii, the only winged midge native to Antarctica

Description: Article asserts that Antarctica and the sub-Antarctic islands include some of the world’s most extreme and pristine terrestrial habitats. The authors studied the habitat preferences and the life history of P. steinenii in Lake Kitiesh, Fildes Peninsula, King George Island over the austral summer seasons from 2014 to 2019, during short (several weeks) field expeditions.
Date: December 24, 2022
Creator: Mejias, Tamara Contador; Gañán, Melisa; Rendoll Cárcamo, Javier; Maturana, Claudia S.; Benítez, Hugo A.; Kennedy, James H. et al.
Partner: UNT College of Science
open access

Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota, U.S.A.

Description: Paleorecords of the middle Holocene (MH) from the North American midcontinent can offer insights into ecological responses to pervasive drought that may accompany future climatic warming. We analyzed MH sediments from West Olaf Lake (WOL) and Steel Lake (SL) in Minnesota to examine the effects of warm/dry climatic conditions on prairie-woodland ecosystems. Mineral composition and carbonate {delta}{sup 18}O were used to determine climatic variations, whereas pollen assemblages, charcoal {delta}{… more
Date: December 24, 2003
Creator: Nelson, D. M.; Hu, F. S.; Tian, J.; Stefanova, I. & Brown, T. A.
Partner: UNT Libraries Government Documents Department
open access

Effects of Hydrogen Implantation into GaN

Description: Proton implantation in GaN is found to reduce the free carrier density through two mechanisms - first, by creating electron and hole traps at around Ec-0.8eV and Ev+0.9eV that lead to compensation in both n- and p-type material, and second, by leading to formation of (AH)O complexes, where A is any acceptor (Mg, Ca, Zn, Be, Cd). The former mechanism is usefid in creating high resistivity regions for device isolation, whereas the latter produces unintentional acceptor passivation that is detrime… more
Date: December 24, 1998
Creator: Abernathy, C.R.; Han, J.; Pearton, S.J.; Shul, R.J.; Song, C.Y.; Stavola, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Characterization of nodular and thermal defects in hafnia/silica multilayer coatings using optical, photothermal, and atomic force microscopy

Description: Multilayer coatings manufactured from metallic hafnium and silica sources by reactive electron beam deposition, are being developed for high fluence optics in a fusion laser with a wavelength of 1053 nm and a 3 ns pulse length. Damage threshold studies have revealed a correlation between laser damage and nodular defects, but interestingly laser damage is also present in nodule-free regions. Photothermal studies of optical coatings reveal the existence of defects with strong optical absorption i… more
Date: December 24, 1997
Creator: Stolz, C. J.; Yoshiyama, J. M.; Salleo, A.; Wu, Z. L.; Green, J. & Krupka, R.
Partner: UNT Libraries Government Documents Department
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