Global Structure of Exact Scalar Hairy Dynamical Black Holes

We study the global structure of some exact scalar hairy dynamical black holes which were constructed in Einstein gravity either minimally or non-minimally coupled to a scalar field. We find that both the apparent horizon and the local event horizon (measured in luminosity coordinate) monotonically increase with the advanced time as well as the Vaidya mass. At late advanced times, the apparent horizon approaches the event horizon and gradually becomes future outer. Correspondingly, the space-time arrives at stationary black hole states with the relaxation time inversely proportional to the $1/(n-1)$ power of the final black hole mass, where $n$ is the space-time dimension. These results strongly support the solutions describing the formation of black holes with scalar hair. We also obtain new charged dynamical solutions in the non-minimal theory by introducing an Maxwell field which is non-minimally coupled to the scalar. The presence of the electric charge strongly modifies the dynamical evolution of the space-time.Comment: 18 pages and 6 figures; minor corrections, publised versio

Criticality in Einstein-Gauss-Bonnet Gravity: Gravity without Graviton

General Einstein-Gauss-Bonnet gravity with a cosmological constant allows two (A)dS spacetimes as its vacuum solutions. We find a critical point in the parameter space where the two (A)dS spacetimes coalesce into one and the linearized perturbations lack any bilinear kinetic terms. The vacuum perturbations hence loose their interpretation as linear graviton modes at the critical point. Nevertheless, the critical theory admits black hole solutions due to the nonlinear effect. We also consider Einstein gravity extended with general quadratic curvature invariants and obtain critical points where the theory has no bilinear kinetic terms for either the scalar trace mode or the transverse modes. Such critical phenomena are expected to occur frequently in general higher derivative gravities.Comment: 21 pages, no figures;refereces adde

Achieving Adaptation Through Live Virtual Machine Migration in Two-Tier Clouds

This thesis presents a model-driven approach for application deployment and management in two-tier heterogeneous cloud environments. For application deployment, we introduce the architecture, the services and the domain specific language that abstract common features of multi-cloud deployments. By leveraging the architecture and the language, application deployers author a deployment model that captures the high-level structure of the application. The deployment model is then translated into deployment workflows on specific clouds. As a use case, we introduce a live VM migration framework that maintains the application quality of services through VM migrations across two tier-clouds. The proposed framework can monitor the performance of the applications and their underlying infrastructure and plan and executes VM migrations to eliminate hotspots in a datacenter. We evaluate both the application deployment architecture and the live migration on public clouds

Massive Molecular Parallel Evolution of the HSP90AA1 Gene between High-elevation Anurans

HSP90AA1 is part of the heat shock protein 90 gene family and has important functions against heat stress. We report a case of molecular level parallel evolution of the HSP90AA1 gene in high elevation amphibians. IISP90AA1 gene sequences of four high-elevation anurans, Bufo gargarizans, Nanorana parkeri, Rana kukunoris, and Scutiger boulengeri, were compared along with five of their low-elevation relatives. A total of 16 amino-acid sites were identified as parallel evolution between N parkeri and R. kukunoris. We generated both model based (Zhang and Kumar's test) and empirical data based (parallel/divergence plotting) null distributions for non-parallel evolution, and both methods clearly determined that the observed number of parallel substitutions were significantly more than the null expectation. Furthermore, on the HSP90AA1 gene tree, N. parkeri and R. kukunoris formed a strongly supported Glade that was away from their respective relatives. This study provides a clear case of molecular parallel evolution, which may have significant implications in understanding the genetic mechanisms of high-elevation adaptation

开展创先争优活动 构建和谐医患关系——以急诊科 党支部为例

Further developing activities of striving to be advanced and creating excellence are the need of strengthening party organization of basic level and establishing harmonious society of the socialism. In this paper, we explore the concrete methods of carrying out activities of striving to be advanced and creating excellence in emergency department, and their effects on improving relationship between medical care providers and patients, it has certain theoretical and real significance.深入开展创先争优活动，是加强基层党组织建设、构建社会主义和谐社会的需要。本文针对医院急诊科医患关系的特点，以创先争优活动为契机，创新实践载体，探讨在医院急诊科开展创先争优活动的具体方法及对改善医患关系的作用与效果，具有一定理论和现实意义

8-Thia-1,6-diaza­bicyclo­[4.3.0]nonane-7,9-dione

There are two independent mol­ecules, A and B, in the asymmetric unit of the title compound, C6H8N2O2S. In the crystal, pairs of inter­molecular S⋯O contacts [3.286 (1) Å] link the B mol­ecules into inversion dimers