UNT College of Arts and Sciences - 67 Matching Results

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open access

Artificially Structured Boundary for a high purity ion trap or ion source

Description: This article proposes a plasma enclosed by an Artificially Structured Boundary (ASB) as an alternative to existing ion source assemblies. In accelerator applications, many ion sources can have a limited lifetime or frequent service intervals due to sputtering and eventual degradation of the ion source assembly. Ions are accelerated towards the exit canal of positive ion sources, whereas, due to the biasing scheme, electrons or negative ions are accelerated towards the back of the ion source ass… more
Date: August 1, 2014
Creator: Pacheco, J. L.; Ordonez, Carlos A. & Weathers, Duncan L.
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open access

Magnetobound positronium and protonium

Description: This article investigates the formation of magnetobound positronium and protonium via classical trajectory simulations of binary point charge interactions in an external magnetic field. The results of computer simulations of the fully three-dimensional trajectories of classical and non-relativistic point charges with the same mass, equal charge magnitude, and opposite sign are reported. The simulations show the formation of magnetobound positronium and protonium. The results yield formation cro… more
Date: August 27, 2014
Creator: Correa, J. R. & Ordonez, Carlos A.
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open access

Phase space of positron trajectories exiting a charged particle source through a magnetic field point cusp

Description: This article presents a configuration of magnetic fields using properties of cylindrically symmetric permanent magnets as a candidate to produce a high purity charged particle source or trap. Cylindrically symmetric hollow permanent magnets produce magnetic field point cusps on the axis of symmetry. A magnetic field point cusp reflects all particles that lie outside a narrow region of phase space, a region dependent on particle kinetic energies and on the magnetic field intensity.
Date: August 1, 2014
Creator: Kiester, A. S.; Pacheco, J. L.; Ordonez, Carlos A. & Weathers, Duncan L.
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open access

Negative Regulation of Signal Transducer and Activator of Transcription-3 Signalling Cascade by Lupeol Inhibits Growth and Induces Apoptosis in Hepatocellular Carcinoma Cells

Description: In this article, the authors evaluate the effect of lupeol on STAT3 signalling cascade and its regulated functional responses in hepatocellular carcinoma (HCC) cells. Constitutive activation of signal transducer and activator of transcription signalling 3 (STAT3) has been linked with survival, proliferation and angiogenesis in a wide variety of malignancies including HCC. Lupeol exhibited its potential anticancer effects in HCC through the downregulation of STAT3-induced pro-survival signalling… more
Date: August 7, 2014
Creator: Siveen, Kodappully Sivaraman; Nguyen, An H.; Lee, J. H.; Li, Feng; Singh, S. S.; Kumar, Alan Prem et al.
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open access

Existence and Nonexistence of Solutions for Semilinear Equations on Exterior Domains

Description: This article studies radial solutions of Δu + K(r)ƒ(u) = 0 on the exterior of the ball of radius R > 0 centered at the origin in ℝᴺ where ƒ is odd with ƒ < 0 on (0,ß), ƒ > 0 on (β, δ), ƒ ≡ 0 for u > δ, and where the function K(r) is assumed to be positive and K(r) → 0 as r → ∞.
Date: August 22, 2016
Creator: Iaia, Joseph A.
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open access

Patrones Estacionales Y Espaciales De La Diversidad De Moluscos Intermareales De Bahía RóBalo, Canal Beagle, Reserva De La Biosfera Cabo De Hornos, Chile

Description: This article characterizes molluscs assemblages in Róbalo bay, identifying spatial-temporal changes in assemblage composition, species richness, abundance, functional groups, and diversity of molluscs species.
Date: August 28, 2014
Creator: Ojeda, Jaime; Rosenfeld, Sebastián; Marambio, Johanna; Rozzi, Ricardo, 1960- & Mansilla, Andrés O.
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open access

The Deepest X-Ray View of High-Redshift Galaxies: Constraints on Low-Rate Black Hole Accretion

Description: This article exploits the 7 Ms Chandra observations in the Chandra Deep Field-South (CDF-S), the deepest X-ray survey to date, coupled with CANDELS/GOODS-S data, to measure the total X-ray emission arising from 2076 galaxies at 3.5 ≤ z ≤ 6.5.
Date: August 5, 2016
Creator: Vito, F.; Gilli, Roberto; Vignali, Christian; Brandt, William Nielsen; Comastri, Andrea; Yang, G. et al.
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open access

Reactive oxygen species, abiotic stress and stress combination

Description: This article reviews recent studies on the role of reactive oxygen species (ROS) in abiotic stress in plants, and propose that different abiotic stresses, such as drought, heat, salinity and high light, result in different ROS signatures that determine the specificity of the acclimation response and help tailor it to the exact stress the plant encounters.
Date: August 4, 2016
Creator: Choudhury, Feroza K.; Rivero, Rosa M. & Blumwald, Eduardo
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open access

Glucose or Altered Ceramide Biosynthesis Mediate Oxygen Deprivation Sensitivity Through Novel Pathways Revealed by Transcriptome Analysis in Caenorhabditis elegans

Description: This article discusses how RNA-sequencing analysis was performed to assess how a glucose-supplemented diet and/or a hyl-2 mutation altered the transcriptome.
Date: August 5, 2016
Creator: Ladage, Mary L.; King, Skylar D.; Burks, David J.; Quan, Daniel L.; Garcia, Anastacia M.; Azad, Rajeev K. et al.
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open access

Inverted Social Reward: Associations between Psychopathic Traits and Self-Report and Experimental Measures of Social Reward

Description: This article describes two studies of individuals with high levels of psychopathic traits. Study 1 explores what aspects of social reward are associated with psychopathic traits, and Study 2 administers these measures to a new group of participants along with two experimental tasks investigating monetary and social reward value.
Date: August 27, 2014
Creator: Foulkes, Lucy; McCrory, Eamon J.; Neumann, Craig S. & Viding, Essi
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