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Search Results: 1 - 10 of 297799 matches for " J. Forbes "
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Interaction Propositions: A Comparison of “Dramaturgical Analysis” and “Exchange Theory,” the Micro Sociological Explanations of Face-to-Face Communication Proposed by Erving Goffman and George C. Homans
J Forbes Farmer
Journal of Society and Communication , 2012,
Abstract: This article is an investigation into some aspects of the communication-focused exchange theory as proposed by George C. Homans and the dramaturgical analysis of Erving Goffman. By presenting evidence from the original writings of these “contemporary” social theorists, the author suggests that Goffman’s symbolic interactionism could be assimilated into Homans’ propositions, or laws, and gereralizations about communication, interactions and encounters.
A Proof of Concept Study on Cortisol Response to Three Different Educational Environs (Alone, Same-Sex, and Mixed-Sex)  [PDF]
Sean A. Forbes, Svetlana Chesser, Anthony J. Guarino
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.44A002
This proof of concept study assessed student cortisol levels under three environs: 1) alone; 2) same-sex setting; and 3) mixed-sex setting after completing a cognitive task. The results indicated that both males and females demonstrated increased levels in the same-sex environs compared to the other environs. The relevant issue for educators is whether this response is adaptive. Implications of these findings are discussed.
A constructive approach for discovering new drug leads: Using a kernel methodology for the inverse-QSAR problem
William WL Wong, Forbes J Burkowski
Journal of Cheminformatics , 2009, DOI: 10.1186/1758-2946-1-4
Abstract: In this paper, we describe the reversibility of our previously reported descriptor, the vector space model molecular descriptor (VSMMD) based on a vector space model that is suitable for kernel studies in QSAR modeling. Our inverse-QSAR approach can be described using five steps: (1) generate the VSMMD for the compounds in the training set; (2) map the VSMMD in the input space to the kernel feature space using an appropriate kernel function; (3) design or generate a new point in the kernel feature space using a kernel feature space algorithm; (4) map the feature space point back to the input space of descriptors using a pre-image approximation algorithm; (5) build the molecular structure template using our VSMMD molecule recovery algorithm.The empirical results reported in this paper show that our strategy of using kernel methodology for an inverse-Quantitative Structure-Activity Relationship is sufficiently powerful to find a meaningful solution for practical problems.The structural conformation and physicochemical properties of both the ligand and its receptor site determine the level of binding affinity that is observed in such an interaction. If the structural properties of the receptor site are known (for example, there is crystallographic data) then techniques involving approximations of potential functions can be applied to estimate or at least compare binding affinities of various ligands [1]. When this information is sparse or not available, as is the case for many membrane proteins, it becomes necessary to estimate affinities using only the properties of the ligand. This ligand-based prediction strategy is often used in applications such as virtual screening of molecular databases in a drug discovery procedure.In a more general setting we strive to establish the quantitative dependency between the molecular properties of a ligand and its binding affinity. To restate this goal using current terminology: we want to analyze the Quantitative Structure-Activity
Global transport and localized layering of metallic ions in the upper atmospherer
L. N. Carter,J. M. Forbes
Annales Geophysicae (ANGEO) , 2003,
Abstract: A numerical model has been developed which is capable of simulating all phases of the life cycle of metallic ions, and results are described and interpreted herein for the typical case of Fe+ ions. This cycle begins with the initial deposition of metallics through meteor ablation and sputtering, followed by conversion of neutral Fe atoms to ions through photoionization and charge exchange with ambient ions. Global transport arising from daytime electric fields and poleward/ downward di.usion along geomagnetic field lines, localized transport and layer formation through de- scending convergent nulls in the thermospheric wind field, and finally annihilation by chemical neutralization and compound formation are treated. The model thus sheds new light on the interdependencies of the physical and chemical processes a.ecting atmospheric metallics. Model output analysis confirms the dominant role of both global and local transport to the ion's life cycle, showing that upward forcing from the equatorial electric field is critical to global movement, and that diurnal and semidiurnal tidal winds are responsible for the forma- tion of dense ion layers in the 90±250 km height region. It is demonstrated that the assumed combination of sources, chemical sinks, and transport mechanisms actually produces F-region densities and E-region layer densities similar to those observed. The model also shows that zonal and meridional winds and electric fields each play distinct roles in local transport, whereas the ion distribution is relatively insensitive to reasonable variations in meteoric deposition and chemical reaction rates. Key words. Ionosphere (ion chemistry and composition; ionosphere-atmosphere interactions).
On The Relationship Between Age and Dynamics in Elliptical Galaxies
Duncan A. Forbes,Trevor J. Ponman
Physics , 1999, DOI: 10.1046/j.1365-8711.1999.02868.x
Abstract: Here, using a sample of 88 galaxies, we examine the scatter about the Faber-Jackson (F-J) relation, and find that a galaxy's position relative to this relation depends on its age. We attempt to reproduce the observed trend of the F-J residuals with age using two simple models. The first assumes that galaxy age is tracing the last major star formation event in an elliptical galaxy. The fading of this burst changes the M_B component of the F-J residuals, with time. Such a model was very successful at reproducing the B-V and Mg_2 evolution reported in our previous paper, but is unable to reproduce the strength of the F-J trend. A second model is required to describe age-correlated changes in galaxy dynamics. Following expectations from cosmological simulations, we assume that the velocity dispersion, for a galaxy of a given mass, scales with the epoch of galaxy formation, i.e. with the mean density of the Universe. Hence recently formed ellipticals have systematically lower velocity dispersions than old ellipticals. We find that a combination of these two models provides a good match to the change in F-J residuals with galaxy age. This suggests that young ellipticals will have subtly different dynamical properties to old ellipticals. We also find that there is not a strong relationship between a galaxy's age and its luminosity for our sample. This suggests that the tilt of the fundamental plane is not totally driven by age.
A Note on the Overall Magnification of a Gravitational Point-Source-Point-Lens System
S. J. Walters,L. K. Forbes
Physics , 2015,
Abstract: The total magnification due to a point lens has been of particular interest as the theorem that gravitational lensing results in light amplification for all observers appears to contradict the conservation of photon number. This has been discussed several times, and various resolutions have been offered. In this note, we use a kinematic approach to provide a formula for the magnification factor for the primary image accurate to first order and valid for rays leaving the source at any trajectory. We thus determine the magnification over a sphere surrounding the system. A new result found is that while the magnification dips below unity far from the optical axis as noted by others, it returns to unity directly behind the source.
The Relevance of Local-Scale Relationships to Habitat Management and Landscape Patterns
Joseph J. Nocera,Graham J. Forbes,G. Randy Milton
Avian Conservation and Ecology , 2008,
The Southern Vilnius Photometric System. IV. The E Regions Standard Stars
M. C. Forbes,R. J. Dodd,D. J. Sullivan
Physics , 1997,
Abstract: This paper is the fourth in a series on the extension of the Vilnius photometric system to the southern hemisphere. Observations were made of 60 stars in the Harvard Standard E regions to increase a set of standard stars.
Hubble Space Telescope survey of the Perseus Cluster -IV: Compact stellar systems in the Perseus Cluster core and Ultra Compact Dwarf formation in star forming filaments
Samantha J. Penny,Duncan A. Forbes,Christopher J. Conselice
Physics , 2012, DOI: 10.1111/j.1365-2966.2012.20669.x
Abstract: We present the results of the first search for Ultra Compact Dwarfs (UCDs) in the Perseus Cluster core, including the region of the cluster around the unusual Brightest Cluster Galaxy (BCG) NGC 1275. Utilising Hubble Space Telescope Advanced Camera for Surveys imaging, we identify a sample of 84 UCD candidates with half-light radii 10 pc < r_e < 57 pc out to a distance of 250 kpc from the cluster centre, covering a total survey area of ~70 armin^2. All UCDs in Perseus lie in the same size-luminosity locus seen for confirmed UCDs in other regions of the local Universe. The majority of UCDs are brighter than M_R = -10.5, and lie on an extrapolation of the red sequence followed by the Perseus Cluster dwarf elliptical population to fainter magnitudes. However, three UCD candidates in the vicinity of NGC 1275 are very blue, with colours (B-R)_0 < 0.6 implying a cessation of star formation within the past 100 Myr. Furthermore, large blue star clusters embedded in the star forming filaments are highly indicative that both proto-globular clusters (GCs) and proto-UCDs are actively forming at the present day in Perseus. We therefore suggest star forming filaments as a formation site for some UCDs, with searches necessary in other low redshift analogues of NGC 1275 necessary to test this hypothesis. We also suggest that tidal disruption of dwarf galaxies is another formation channel for UCD formation in the core of Perseus as tidal disruption is ongoing in this region as evidenced by shells around NGC 1275. Finally, UCDs may simply be massive GCs based on strong similarities in the colour trends of the two populations.
Progestin Receptor-Mediated Reduction of Anxiety-Like Behavior in Male Rats
Catherine J. Auger, Robin M. Forbes-Lorman
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0003606
Abstract: Background It is well known progesterone can have anxiolytic-like effects in animals in a number of different behavioral testing paradigms. Although progesterone is known to influence physiology and behavior by binding to classical intracellular progestin receptors, progesterone's anxiety reducing effects have solely been attributed to its rapid non-genomic effects at the GABAA receptor. This modulation occurs following the bioconversion of progesterone to allopregnanolone. Seemingly paradoxical results from some studies suggested that the function of progesterone to reduce anxiety-like behavior may not be entirely clear; therefore, we hypothesized that progesterone might also act upon progestin receptors to regulate anxiety. Methodology/Principal Findings To test this, we examined the anxiolytic-like effects of progesterone in male rats using the elevated plus maze, a validated test of anxiety, and the light/dark chamber in the presence or absence of a progestin receptor antagonist, RU 486. Here we present evidence suggesting that the anxiolytic-like effects of progesterone in male rats can be mediated, in part, by progestin receptors, as these effects are blocked by prior treatment with a progestin receptor antagonist. Conclusion/Significance This indicates that progesterone can act upon progestin receptors to regulate anxiety-like behavior in the male rat brain.
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