Variations of Boundary Surface in Chua’s Circuit

The paper compares the boundary surfaces with help of cross-sections in three projection planes, for the four changes of Chua’s circuit parameters. It is known that due to changing the parameters, the Chua’s circuit can be characterized in addition to a stable limit cycle also by one double scroll chaotic attractor, two single scroll chaotic attractors or other two stable limit cycles. Chua’s circuit can even start working as a binary memory. It is not known yet, how changes in parameters and conseqently in attractors in the circuit will affect the morphology of the boundary surface. The boundary surface separates the double scroll chaotic attractor from the stable limit cycle. In a variation of the parameters presented in this paper the boundary surface will separate even single scroll chaotic attractors from each other. Dividing the state space into regions of attractivity for different attractors, however, remains fundamentally the same

An Abridged Study

This MFA thesis addresses work completed and presented in a thesis exhibition at West Virginia University, the conceptual underpinnings of this work, and the personal motivations for such conceptual lines of inquiry. Focusing on traditional fine art practices of drawing and intaglio printmaking, the accurate reproduction of reality is a strategy for changing the context in which utilitarian infrastructural objects are seen. The goal of this project is to shift infrastructure from eyesore status to a state of aesthetic appreciation. Through visual isolation, these objects are given the opportunity to stand as discrete and sublime forms. The objects cease to be interlopers, and become integral parts of the visual environment when reintroduced to their landscape. I ground the inquiry into these objects in a personal exploration of my own landscape. The work simultaneously addresses the objects being studied as well as the very act of studying them

Pulsed homodyne measurements of femtosecond squeezed pulses generated by single-pass parametric deamplification

A new scheme is described for pulsed squeezed light generation using femtosecond pulses parametrically deamplified through a single pass in a thin (0.1mm) potassium niobate KNbO3 crystal, with a significant deamplification of about -3dB. The quantum noise of each individual pulse is registered in the time domain using a single-shot homodyne detection operated with femtosecond pulses and the best squeezed quadrature variance was measured to be 1.87 dB below the shot noise level. Such a scheme provides the basic ressource for time-resolved quantum communication protocols.Comment: Accepted for publication in Optics Letter

How should the completeness and quality of curated nanomaterial data be evaluated?

Nanotechnology is of increasing significance. Curation of nanomaterial data into electronic databases offers opportunities to better understand and predict nanomaterials' behaviour. This supports innovation in, and regulation of, nanotechnology. It is commonly understood that curated data need to be sufficiently complete and of sufficient quality to serve their intended purpose. However, assessing data completeness and quality is non-trivial in general and is arguably especially difficult in the nanoscience area, given its highly multidisciplinary nature. The current article, part of the Nanomaterial Data Curation Initiative series, addresses how to assess the completeness and quality of (curated) nanomaterial data. In order to address this key challenge, a variety of related issues are discussed: the meaning and importance of data completeness and quality, existing approaches to their assessment and the key challenges associated with evaluating the completeness and quality of curated nanomaterial data. Considerations which are specific to the nanoscience area and lessons which can be learned from other relevant scientific disciplines are considered. Hence, the scope of this discussion ranges from physicochemical characterisation requirements for nanomaterials and interference of nanomaterials with nanotoxicology assays to broader issues such as minimum information checklists, toxicology data quality schemes and computational approaches that facilitate evaluation of the completeness and quality of (curated) data. This discussion is informed by a literature review and a survey of key nanomaterial data curation stakeholders. Finally, drawing upon this discussion, recommendations are presented concerning the central question: how should the completeness and quality of curated nanomaterial data be evaluated

Local television crime news visuals and concern about crime: exploring the cultivation process through recall and meaning of visual images

Thesis (Ph. D.)--University of Washington, 1994This study explores cognitive processes involved in cultivation by examining recall and meaning of visual images in local television crime news and their relation to concern about crime. Data were gathered through a content analysis, viewing experiment, and survey. The content analysis documented visual patterns found in a sample of local television crime news in six U.S. cities, and provided data used to construct the study's viewing experiment. Free recall and meanings of visuals were measured in three crime news viewing treatments. The survey measured television exposure (including news and local news), concern about crime (through 15 measures and four indexes), criminal victimization, and general demographic data. A sample of 118 University of Washington students participated in the study.Results show significant differences between heavier and lighter viewers in their constructed meanings of television crime news visuals. The differences appear to be linked to higher concern about crime for the heavier viewers. Heavier news viewers, more often than lighter viewers, interpret crime-specific visuals (i.e. a body on a stretcher) with meanings that go far beyond what is evident in the pictures. Their interpretations also focus on crime. Viewers who remember crime-specific shots are more likely to express greater concern about crime than viewers who recall more general visuals. Results imply that specific content viewing, particularly the visual aspects of television news, play an integral role in cultivation. The findings further our understanding of the cultivation process by suggesting that cognitive differences in visual processing between heavier and lighter viewers contribute to greater concern about crime for heavier viewers

Determining the Correlation between Particulate Matter PM10 and Meteorological Factors

In the article, we point out the need to measure the mass concentration of particulate matter (PM) in central Europe in a place of residence (a city and a small town), as PM has a negative impact on human health, especially that of children and the elderly. Since different amounts of PM (mainly peaks) were measured at two locations at a distance of 35 m from each other, a control measurement was also performed to verify the conformity of the measurements of both sensors, which was confirmed with measured courses of quantities. Cases of strong correlation (very close relationship) between PM10 and meteorological factors (temperature, humidity, barometric pressure) were found, but cases of no correlation were found as well, probably due to the effect of wind, which has not been measured yet. The article also points to the fact that, especially during the autumn/winter/spring heating season, the air quality in a small village may be worse than in a large city. This was also confirmed by the detected AQI sub-indices from PM2.5 and PM10. Due to the current rise in prices of gas and electricity, the use of wood combustion as a heating source is nowadays becoming increasingly more attractive, which may contribute to the worsening of the air quality in the future

Visualization of chaos

Subject of this article is visualization ofchaotic attractor in 3D space. 3D view of chaosenables create a demonstrative projection aboutrelations of chaos generated by physical circuit -Chua’s circuit. The program created in C++program language enables view on chaotic attractorboth in 2D and 3D space together with plane objectsvisualization – elements of singularities. The Chua’sattractor visualisation represents visualization oflarge graphical data set

Determining the Correlation between Particulate Matter PM10 and Meteorological Factors

In the article, we point out the need to measure the mass concentration of particulate matter (PM) in central Europe in a place of residence (a city and a small town), as PM has a negative impact on human health, especially that of children and the elderly. Since different amounts of PM (mainly peaks) were measured at two locations at a distance of 35 m from each other, a control measurement was also performed to verify the conformity of the measurements of both sensors, which was confirmed with measured courses of quantities. Cases of strong correlation (very close relationship) between PM10 and meteorological factors (temperature, humidity, barometric pressure) were found, but cases of no correlation were found as well, probably due to the effect of wind, which has not been measured yet. The article also points to the fact that, especially during the autumn/winter/spring heating season, the air quality in a small village may be worse than in a large city. This was also confirmed by the detected AQI sub-indices from PM2.5 and PM10. Due to the current rise in prices of gas and electricity, the use of wood combustion as a heating source is nowadays becoming increasingly more attractive, which may contribute to the worsening of the air quality in the future