The observational properties of globular cluster systems (GCSs) are vital tools to investigate the violent star formation histories of their host galaxies. This violence is thought to have been triggered by galaxy interactions or mergers. The most basic properties of a GCS are its luminosity function (number of clusters per luminosity bin) and color distributions. A large number of observed GCS...

Under highly security vulnerable, resource-restricted, and dynamically changing mobile ad hoc environments, it is critical to be able to maximize the system lifetime while bounding the communication response time for mission-oriented mobile groups. In this paper, we analyze the tradeoff of security versus performance for distributed intrusion detection protocols employed in mobile group communi...

We develop a mathematical model to quantitatively analyze a scalable region-based hierarchical group key management protocol integrated with intrusion detection to deal with both outsider and insider security attacks for group communication systems (GCSs) inmobile ad hoc networks (MANETs). Our proposed adaptive intrusion detection technique is based on majority voting by nodes in a geographical...

We present the results of our detailed WFPC2-based photometric study of the globular cluster systems (GCS) of over 60 elliptical and S0 galaxies. Approximately 50% of the GCSs of ellipticals, and at least 15-20% of S0s reveal bimodality in the color distribution. We trace the variation in GCS properties with Hubble type and discuss the implications on the various models of galaxy (and cluster s...

Recent observational results on the globular cluster systems of spiral galaxies are summarized. Although the number of spirals with well–studied GCSs is still small, new studies promise to increase it rapidly in the next few years. New telescopes and technology have contributed to increasingly detailed studies of GCs in Local Group galaxies like M31 and M33, and more distant spirals like M81 an...

Globins (Glbs) are proteins widely distributed in organisms. Three evolutionary families have been identified in Glbs: the M, S and T Glb families. The M Glbs include flavohemoglobins (fHbs) and single-domain Glbs (SDgbs); the S Glbs include globin-coupled sensors (GCSs), protoglobins and sensor single domain globins, and the T Glbs include truncated Glbs (tHbs). Structurally, the M and S Glbs ...

Although there is a developing strand of literature on young people’s participation in environmental activism, have been few systematic comparisons their different forms activism. This article compares the people and older counterparts climate change marches Global Climate Strikes (GCSs). The agential structural factors that draw into protest are, general terms, well recognized. However, it als...

Using high-resolution numerical simulations, we investigate massand luminosity-normalized specific frequencies (TN and SN, respectively) of globular cluster systems (GCSs) in order to understand the origin of the observed Ushaped relation between SN and V -band magnitude (MV) of their host galaxies. We adopt a biased GC formation scenario in which GC formation is truncated in galaxy halos that ...

Contraction theory is a powerful tool for proving asymptotic properties of nonlinear dynamical systems including convergence to an attractor and entrainment to a periodic excitation.We consider generalizations of contractionwith respect to a norm that allow contraction to take place after small transients in time and/or amplitude. These generalized contractive systems (GCSs) are useful for seve...