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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Analysis Of Residence Time In The Measurement Of Radon Activity By Passive Diffusion In An Open Volume: A Micro-Statistical Approach, Mark P. Silverman
Analysis Of Residence Time In The Measurement Of Radon Activity By Passive Diffusion In An Open Volume: A Micro-Statistical Approach, Mark P. Silverman
Faculty Scholarship
Residence time in a flow measurement of radioactivity is the time spent by a pre-determined quantity of radioactive sample in the flow cell. In a recent report of the measurement of indoor radon by passive diffusion in an open volume (i.e. no flow cell or control volume), the concept of residence time was generalized to apply to measurement conditions with random, rather than directed, flow. The generalization, leading to a quantity r ∆t , involved use of a) a phenomenological alpha-particle range function to calculate the effective detection volume, and b) a phenomenological description of diffusion by Fick’s law to …
Diverse Stellar Haloes In Nearby Milky Way Mass Disc Galaxies., Benjamin Harmsen, Antonela Monachesi, Eric F. Bell, Roelof S. De Jong, Jeremy Bailin, David J. Radburn-Smith, Benne W. Holwerda
Diverse Stellar Haloes In Nearby Milky Way Mass Disc Galaxies., Benjamin Harmsen, Antonela Monachesi, Eric F. Bell, Roelof S. De Jong, Jeremy Bailin, David J. Radburn-Smith, Benne W. Holwerda
Faculty Scholarship
We have examined the resolved stellar populations at large galactocentric distances along the minor axis (from 10 kpc up to between 40 and 75 kpc), with limited major axis coverage, of six nearby highly inclined MilkyWay (MW) mass disc galaxies using Hubble Space Telescope data from the Galaxy haloes, Outer discs, Substructure, Thick discs, and Star clusters (GHOSTS) survey. We select red giant branch stars to derive stellar halo density profiles. The projected minor axis density profiles can be approximated by power laws with projected slopes of −2 to −3.7 and a diversity of stellar halo masses of 1–6 × …
Galaxy And Mass Assembly (Gama) : Active Galactic Nuclei In Pairs Of Galaxies., Yjan A. Gordon, Matt S. Owers, Kevin A. Pimbblet, Scott M. Croom, Mehmet Alpaslan, Ivan K. Baldry, Sarah Brough, Michael J. I. Brown, Michelle E. Cluver, Christopher J. Conselice, Luke J. M. Davies, Benne W. Holwerda, Andrew M. Hopkins, Madusha L. P. Gunawardhana, Jonathan Loveday, Edward N. Taylor, Lingyu Wang
Galaxy And Mass Assembly (Gama) : Active Galactic Nuclei In Pairs Of Galaxies., Yjan A. Gordon, Matt S. Owers, Kevin A. Pimbblet, Scott M. Croom, Mehmet Alpaslan, Ivan K. Baldry, Sarah Brough, Michael J. I. Brown, Michelle E. Cluver, Christopher J. Conselice, Luke J. M. Davies, Benne W. Holwerda, Andrew M. Hopkins, Madusha L. P. Gunawardhana, Jonathan Loveday, Edward N. Taylor, Lingyu Wang
Faculty Scholarship
There exist conflicting observations on whether or not the environment of broad- and narrow-line active galatic nuclei (AGN) differ and this consequently questions the validity of the AGN unification model. The high spectroscopic completeness of the Galaxy and Mass Assembly (GAMA) survey makes it ideal for a comprehensive analysis of the close environment of galaxies. To exploit this, and conduct a comparative analysis of the environment of broad- and narrow-line AGN within GAMA, we use a double-Gaussian emission line fitting method to model the more complex line profiles associated with broad-line AGN. We select 209 type 1 (i.e. unobscured), 464 …
Triarylmethyl Cation Catalysis: A Tunable Lewis Acid Organocatalyst For The Synthesis Of Bisindolylmethanes, Nicholas G. Boekell, Dana J. Cerone, Maria M. Boucher, Wilfried B. Nganyak Tentchou, Christine G. Reavis, Ifeanyi I. Okoh, Jordan O.A. Reid, Hayley E. Berg, Briana A. Chang, Cheyenne S. Brindle
Triarylmethyl Cation Catalysis: A Tunable Lewis Acid Organocatalyst For The Synthesis Of Bisindolylmethanes, Nicholas G. Boekell, Dana J. Cerone, Maria M. Boucher, Wilfried B. Nganyak Tentchou, Christine G. Reavis, Ifeanyi I. Okoh, Jordan O.A. Reid, Hayley E. Berg, Briana A. Chang, Cheyenne S. Brindle
Faculty Scholarship
Triarylmethyl cations serve as tunable organocatalysts for the synthesis of bisindolylmethanes. The catalyst structure can be modified to increase or decrease reactivity as needed to match the requirements of the substrate. High yields are achieved for a variety of substrates by using these green catalysts. Catalyst tuning allows for the use of less reactive electrophiles by increasing the reactivity of the catalyst. Acid-sensitive products can be isolated under these mild reaction conditions.
Collective Phenomena Emerging From The Interactions Between Dynamical Processes In Multiplex Networks, Vincenzo Nicosia, Per Sebastian Skardal, Alex Arenas, Vito Latora
Collective Phenomena Emerging From The Interactions Between Dynamical Processes In Multiplex Networks, Vincenzo Nicosia, Per Sebastian Skardal, Alex Arenas, Vito Latora
Faculty Scholarship
We introduce a framework to intertwine dynamical processes of different nature, each with its own distinct network topology, using a multilayer network approach. As an example of collective phenomena emerging from the interactions of multiple dynamical processes, we study a model where neural dynamics and nutrient transport are bidirectionally coupled in such a way that the allocation of the transport process at one layer depends on the degree of synchronization at the other layer, and vice versa. We show numerically, and we prove analytically, that the multilayer coupling induces a spontaneous explosive synchronization and a heterogeneous distribution of allocations, otherwise …
Diffusion Dynamics And Synchronizability Of Hierarchical Products Of Networks, Per Sebastian Skardal
Diffusion Dynamics And Synchronizability Of Hierarchical Products Of Networks, Per Sebastian Skardal
Faculty Scholarship
The hierarchical product of networks represents a natural tool for building large networks out of two smaller subnetworks: a primary subnetwork and a secondary subnetwork. Here we study the dynamics of diffusion and synchronization processes on hierarchical products. We apply techniques previously used for approximating the eigenvalues of the adjacency matrix to the Laplacian matrix, allowing us to quantify the effects that the primary and secondary subnetworks have on diffusion and synchronization in terms of a coupling parameter that weighs the secondary subnetwork relative to the primary subnetwork. Diffusion processes are separated into two regimes: for small coupling the diffusion …
Scientific Controversies: Authentic And Contrived [Post-Print], Mark P. Silverman
Scientific Controversies: Authentic And Contrived [Post-Print], Mark P. Silverman
Faculty Scholarship
No abstract provided.
First Test Of Verlinde’S Theory Of Emergent Gravity Using Weak Gravitational Lensing Measurements., Margot M. Brouwer, Manus R. Visser, Andrej Dvornik, Henk Hoekstra, Konrad Kuijken, Edwin A. Valentijn, Maciej Bilicki, Chris Blake, Sarah Brough, Hugo Buddelmeijer, Thomas Erben, Catherine Heymans, Hendrik Hildebrandt, Benne W. Holwerda, Andrew M. Hopkins, Dominik Klaes, Jochen Liske, Jon Loveday, John Mcfarland, Reiko Nakajima, Cristobal Sifon, Edward N. Taylor
First Test Of Verlinde’S Theory Of Emergent Gravity Using Weak Gravitational Lensing Measurements., Margot M. Brouwer, Manus R. Visser, Andrej Dvornik, Henk Hoekstra, Konrad Kuijken, Edwin A. Valentijn, Maciej Bilicki, Chris Blake, Sarah Brough, Hugo Buddelmeijer, Thomas Erben, Catherine Heymans, Hendrik Hildebrandt, Benne W. Holwerda, Andrew M. Hopkins, Dominik Klaes, Jochen Liske, Jon Loveday, John Mcfarland, Reiko Nakajima, Cristobal Sifon, Edward N. Taylor
Faculty Scholarship
Verlinde proposed that the observed excess gravity in galaxies and clusters is the consequence of emergent gravity (EG). In this theory, the standard gravitational laws are modified on galactic and larger scales due to the displacement of dark energy by baryonic matter. EG gives an estimate of the excess gravity (described as an apparent dark matter density) in terms of the baryonic mass distribution and the Hubble parameter. In this work, we present the first test of EG using weak gravitational lensing, within the regime of validity of the current model. Although there is no direct description of lensing and …
Evolving Network Structure Of Academic Institutions, Shufan Wang, Mariam Avagyan, Per Sebastian Skardal
Evolving Network Structure Of Academic Institutions, Shufan Wang, Mariam Avagyan, Per Sebastian Skardal
Faculty Scholarship
Today’s colleges and universities consist of highly complex structures that dictate interactions between the administration, faculty, and student body. These structures can play a role in dictating the efficiency of policy enacted by the administration and determine the effect that curriculum changes in one department have on other departments. Despite the fact that the features of these complex structures have a strong impact on the institutions, they remain by-and-large unknown in many cases. In this paper we study the academic structure of our home institution of Trinity College in Hartford, CT using the major and minor patterns between graduating students …