A filter synthesis technique applied to the design of multistage broad-band microwave amplifiers

A method for designing multistage broad-band amplifiers based upon well-known filter synthesis techniques is presented. Common all-pole low-pass approximations are used to synthesize prototype amplifier circuits that may be scaled in frequency and impedance. All-pass filters introduced at the first stage are shown to improve input match while maintaining circuit performance less 6 dB gain. A theoretical comparison is made with the distributed amplifier and the cascaded single-stage distributed amplifier. Theoretically, a larger gain-bandwidth product is achieved using the synthesis technique. A proof-of-concept Butterworth low-pass two-stage amplifier was designed, simulated, and measured and achieved a flat gain performance of 1–4 GHz with a power gain of 14.5±1 dB close to the predicted 1–4.2 GHz, 15±1 dB

Offshore Pipeline Corridors and Landfalls in Coastal Virginia Volume One

This report is a product of the Virginia Coastal Resources Management (CRM) Program. Along with other coastal states, Virginia is preparing a management program for coastal land and water resources and uses under grants from the Office of Coastal Zone Management (OCZM), of the U.S. Department of Commerce. The Coastal Zone Management Act of 1972, as amended in 1976, enumerates the elements which coastal states and their political subdivisions must include in their program. This report commences the response of the Commonwealth of Virginia to the national concern expressed in Sec. 305(B) (8) of the Act, that is, that states should develop a process for planning the location of energy facilities and for managing their effects on coastal resources. This report is a planning effort aimed at anticipating and planning for the implications of oil and gas drilling on the Atlantic Continental Shelf. Specifically, it is designed to provide technical information on pipeline siting and construction requirements as well as on the potential environmental impacts associated with pipelines. It is intended to assist state and local officials in making decisions about pipelines coming ashore in Virginia-whether to allow or not allow pipelines and, if they are to be allowed, to determine the coastal areas which would be most suitable as landfall sites. The report does not intend to promote or discourage pipelines but rather to Identify and discuss the range of potential problems and opportunities associated with pipeline activities. In addition, this is a technical planning document only and does not attempt to establish policy for the Commonwealth of Virginia with respect to pipelines or any other OCS activity. Every effort has been made to use the most current and accurate resources available and to be objective as possible in presenting the facts and conclusions of this report

Offshore Pipeline Corridors and Landfalls in Coastal Virginia Volume Two - Appendices

This report is a product the Virginia Coastal Resources Management (CRM) Program. Along with other coastal states, Virginia is preparing a mangement program for coastal land water resources and uses under grants from the Office of Coastal Zone Management (OCZM), National Oceanic and Atmospheric Administration, of the U.S. Department of Commerce. The Coastal Zone Management Act of 1972, as amended in 1976, enumerates the elements which coastal states and their political subdivisions must include in their program. This report commences the response of the Comm~nwealth of Virginia to the national concern expressed in Sec. 305(B) (8) of the Act, that is, that states should develop a process for planning the location of energy facilities and for managing their effects on coastal resources. This report is a planning effort aimed at anticipating and planning for the implications of oil and gas drilling on the Atlantic Continental Shelf. Specifically, it is designed to provide technical information on pipeline siting and construction requirements as well as on the potential environmental impacts associated with pipelines. It is intended to assist state and local officials in making decisions about pipelines coming ashore in Virginia-whether to allow or not allow pipelines and, if they are to be allowed, to determine the coastal areas which would be most suitable as landfall sites. The report does not intent to promote or discourage pipelines but rather to identify and discuss the range of potential problems and opportunities associated with pipeline activities. In addition, this is a technical planning document and it does not attempt to establish policy for the Commonwealth of Virginia with respect to pipelines or any other OCS activity. Every effort has been made to use the most current and accurate resources available and to be objective as possible in presenting the facts and conclusions of this report

Dynamic Design Documents for supporting applied visualization

A common characteristic of applied visualization is collaboration between visualization researcher and domain expert – where the vi- sualization researcher attempts to assimilate sufficient detail around data, task and requirements to design a visualization tool that is manifestly useful. We report on a method for enabling such a col- laboration that can be used throughout the design process to gather and develop requirements and continually evaluate and support iter- ative design. We do so using highly interactive web-pages that we term dynamic design documents. Applied during a four-year visual data analysis project for crime research, these documents enabled a series of data mappings to be explored by our collaborators (crime analysts) remotely – in a flexible and continuous way. We argue that they engendered a level of engagement that is qualitatively dis- tinct from more traditional methods of feedback elicitation, offered a solution to limited and intermittent contact between analyst and visualization researcher and speculate that they provided a means of partially addressing certain intractable deficiencies, such as so- cial desirability-bias, that are common to evaluation in applied data visualization

INVISQUE: Intuitive information exploration through interactive visualization

In this paper we present INVISQUE, a novel system designed for interactive information exploration. Instead of a conventional list-style arrangement, in INVISQUE information is represented by a two-dimensional spatial canvas, with each dimension representing user-defined semantics. Search results are presented as index cards, ordered in both dimensions. Intuitive interactions are used to perform tasks such as keyword searching, results browsing, categorizing, and linking to online resources such as Google and Twitter. The interaction-based query style also naturally lends the system to different types of user input such as multi-touch gestures. As a result, INVISQUE gives users a much more intuitive and smooth experience of exploring large information spaces