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Search Results: 1 - 10 of 202 matches for " Kristi Pance "
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Quantum fingerprints of classical Ruelle-Pollicot resonances
Kristi Pance,Wentao Lu,S. Sridhar
Physics , 2000, DOI: 10.1103/PhysRevLett.85.2737
Abstract: N-disk microwave billiards, which are representative of open quantum systems, are studied experimentally. The transmission spectrum yields the quantum resonances which are consistent with semiclassical calculations. The spectral autocorrelation of the quantum spectrum is shown to be determined by the classical Ruelle-Pollicot resonances, arising from the complex eigenvalues of the Perron-Frobenius operator. This work establishes a fundamental connection between quantum and classical correlations in open systems.
Tunneling Proximity Resonances: Interplay between Symmetry and Dissipation
Kristi Pance,Lorenza Viola,S. Sridhar
Physics , 1999, DOI: 10.1016/S0375-9601(00)00121-3
Abstract: We report the first observation of bound-state proximity resonances in coupled dielectric resonators. The proximity resonances arise from the combined action of symmetry and dissipation. We argue that the large ratio between the widths is a distinctive signature of the multidimensional nature of the system. Our experiments shed light on the properties of 2D tunneling in the presence of a dissipative environment.
Microwave study of quantum n-disk scattering
Wentao Lu,Lorenza Viola,Kristi Pance,Michael Rose,S. Sridhar
Physics , 1999, DOI: 10.1103/PhysRevE.61.3652
Abstract: We describe a wave-mechanical implementation of classically chaotic n-disk scattering based on thin 2-D microwave cavities. Two, three, and four-disk scattering are investigated in detail. The experiments, which are able to probe the stationary Green's function of the system, yield both frequencies and widths of the low-lying quantum resonances. The observed spectra are found to be in good agreement with calculations based on semiclassical periodic orbit theory. Wave-vector autocorrelation functions are analyzed for various scattering geometries, the small wave-vector behavior allowing one to extract the escape rate from the quantum repeller. Quantitative agreement is found with the value predicted from classical scattering theory. For intermediate energies, non-universal oscillations are detected in the autocorrelation function, reflecting the presence of periodic orbits.
Quantum correlations and classical resonances in an open chaotic system
Wentao T. Lu,Kristi Pance,Prabhakar Pradhan,S. Sridhar
Physics , 2000,
Abstract: We show that the autocorrelation of quantum spectra of an open chaotic system is well described by the classical Ruelle-Pollicott resonances of the associated chaotic strange repeller. This correspondence is demonstrated utilizing microwave experiments on 2-D n-disk billiard geometries, by determination of the wave-vector autocorrelation C(\kappa) from the experimental quantum spectra S_{21}(k). The correspondence is also established via "numerical experiments" that simulate S_{21}(k) and C(\kappa) using periodic orbit calculations of the quantum and classical resonances. Semiclassical arguments that relate quantum and classical correlation functions in terms of fluctuations of the density of states and correlations of particle density are also examined and support the experimental results. The results establish a correspondence between quantum spectral correlations and classical decay modes in an open systems.
Tailoring the Models of Transcription
Alena Pance
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14047583
Abstract: Molecular biology is a rapidly evolving field that has led to the development of increasingly sophisticated technologies to improve our capacity to study cellular processes in much finer detail. Transcription is the first step in protein expression and the major point of regulation of the components that determine the characteristics, fate and functions of cells. The study of transcriptional regulation has been greatly facilitated by the development of reporter genes and transcription factor expression vectors, which have become versatile tools for manipulating promoters, as well as transcription factors in order to examine their function. The understanding of promoter complexity and transcription factor structure offers an insight into the mechanisms of transcriptional control and their impact on cell behaviour. This review focuses on some of the many applications of molecular cut-and-paste tools for the manipulation of promoters and transcription factors leading to the understanding of crucial aspects of transcriptional regulation.
Baseline Levels of Siderastrea siderea Bleaching under Normal Environmental Conditions in Little Cayman  [PDF]
Samantha Banks, Kristi Foster
Open Journal of Marine Science (OJMS) , 2017, DOI: 10.4236/ojms.2017.71011
Abstract: This study describes the health status of Siderastrea siderea in Little Cayman before, during, and after the 2015 Caribbean-wide elevated temperature anomaly. Colony color was used as a proxy for health during snorkel and scuba surveys of shallow (<2 m depth) and deep (6 - 16 m depth) reefs. Baseline demographics indicated that 6% of this species were pale or blue pre-disturbance. When seawater temperatures exceeded 30.5°C, S. siderea were early indicators of reef stress and among the first corals to bleach. Depth and site resilience did not significantly impact temperature susceptibility; however, smaller colonies (<200 cm2 surface area) were more likely to change color than the larger size classes. Little Cayman’s S. siderea were capable of surviving large-scale (>80%) bleaching: mortality was observed for only one colony. Resilience rates varied considerably: one-third of the impacted population returned to the normal brown color within two months, one-third required 3 - 9 months to recover, and the fates of the remaining one-third remain to be determined. If the return to normal color is indicative of resistance to reef disturbances, S. siderea may be among the “winning” coral species following elevated temperature anomalies which are predicted to occur with increasing frequency and severity as a result of climate change.
Impact of Integrated Arts Therapy: An Intervention Program for Young Female Offenders in Correctional Institution  [PDF]
Kristi K?iv, Lii Kaudne
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.61001
Abstract: The aim of the study was to evaluate the impact of program of integrated arts therapy on young female delinquents’ who experienced emotional and behavioral problems in a correctional institution. The outlined intervention was introduced as part of a curriculum involving art therapy, drama therapy, music therapy, and dance/movement therapy sessions that were facilitated twice a week during a 5-week period. A quasi-experimental design was used where an intervention group (N = 12) and a control group (N = 17) members aged 14 - 17 years were evaluated at two time points. A self-report version of Strengths and Difficulties Questionnaire (SDQ) and a modified Behavior Checklist (BC) were used prior to and after the intervention to screen for conduct, emotional, peer problems, hyperactivity, and prosocial behavior, and to investigate the frequencies of aggressive, withdrawn and prosocial behavior. There were statistically significant reductions in three of the five emotional and behavioral problems measured by the SDQ, including conduct and emotional problems, an increase of prosocial behavior, and significant differences in two domains measured by the BC: decrease in frequencies of aggressive behavior and increase of prosocial behavior.
Demographics and Population Dynamics Project the Future of Hard Coral Assemblages in Little Cayman  [PDF]
Kristi A. Foster, Greg Foster
Open Journal of Marine Science (OJMS) , 2017, DOI: 10.4236/ojms.2018.81010
Individual hard coral colonies from four representative reef sites around Little Cayman were surveyed yearly between 2010 and 2015, a period of non-disturbance between two elevated seawater temperature anomalies. Photographic censuses produced 7069 annual transitions that were used to describe the demographics (size class frequencies, abundance, area cover) and population dynamics under non-disturbance environmental conditions. Agariciids, Porites asteroides, and Siderastrea radians have replaced acroporids as the predominant massive corals. Recruitment rates were generally low (<1 colony per m2), except for a fourfold recruitment pulse of S. radians that occurred in 2011. On average, 42% of coral recruits survived their first year but only 10% lived longer than four years. Temporal comparisons allowed correction factors to be calculated for in-situ methods that overestimate recruitment of colonies ≤2 cm in diameter and overlook larger colonies. Size class transitions included growth (~33%), stasis (~33%), partial mortality (10% - 33%), and whole colony mortality, which decreased with increasing colony size (typically <10% for colonies with surface areas >30 cm2). Transition matrices indicated that Little Cayman assemblages have declining hard coral populations (λ < 1) but as stable size class distributions progress toward higher proportions of colonies with >150 cm2 surface areas, live area cover may remain relatively stable. Projection models indicated that downward population trends would be exacerbated even by mild disturbance (5% - 10% mortality) scenarios. The fate of hard corals on Little Cayman’s reefs was determined to be heavily dependent on the health and transitions of agariciid colonies. Conservation strategies that currently focus on restoration of Caribbean acroporids should be expanded to include agariciids, which were previously considered “weeds”.
Fisherman's Work and the Sea in the Livonian Folk Calendar
Kristi Salve
Folklore : Electronic Journal of Folklore , 1996,
A Heroic Tale's Travel from Siberia to the Balto-Finnic Peoples
Kristi Salve
Folklore : Electronic Journal of Folklore , 2005,
Abstract: The article concerns a fairy tale from A. Andreiev’s fairy-tale index, namely AA 967, which has greatly interested Russian researchers because of its connection with bylina. However, this story is not of East Slavic origin but has enetered the Russians’ repertoire as a substrate. The case is even more interesting since the same story is also known in far East Siberia, among the Paleoasiatic Kets and Samoyed Selkups. The Ket stories are vividly Siberian narratives of inter-tribal feud. The same applies to the story’s western distribution’s periphery - it has been told as a true story in Finland and P.-L. Rausmaa has indexed it as a historical legend. Finnish and Ket versions are similar, while Karelian, Vepsian and probably also the version spread to Russians from them has obtained fairy tale motifs. Undisputable is the common origin of all these stories: coinciding facts are too complex to assume random similarity. The article also discusses whether the narrative is hostile towards women.
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