Matching Items (7)

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CO2 Reduction via Functionalized Protein/Organometallic Complexes

Description

As prices for fuel along with the demand for renewable resources grow, it becomes of paramount importance to develop new ways of obtaining the energy needed to carry out the

As prices for fuel along with the demand for renewable resources grow, it becomes of paramount importance to develop new ways of obtaining the energy needed to carry out the tasks we face daily. Costs of production due to energy and time constraints impose severe limitations on what is viable. Biological systems, on the other hand, are innately efficient both in terms of time and energy by handling tasks at the molecular level. Utilizing this efficiency is at the core of this research. Proper manipulation of even common proteins can render complexes functionalized for specific tasks. In this case, the coupling of a rhenium-based organometallic ligand to a modified myoglobin containing a zinc porphyrin, allow for efficient reduction of carbon dioxide, resulting in energy that can be harnessed and byproducts which can be used for further processing. Additionally, a rhenium based ligand functionalized via biotin is tested in conjunction with streptavidin and ruthenium-bipyridine.

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Date Created
  • 2014-12

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Hexavalent chromium removal using ultraviolet photocatalytic reactor

Description

Hexavalant chromium (Cr(VI)) poses an emerging concern in drinking water treatment with stricter regulations on the horizon. Photocatalytic reduction of Cr(VI) was investigated as an engineering scale option to remove

Hexavalant chromium (Cr(VI)) poses an emerging concern in drinking water treatment with stricter regulations on the horizon. Photocatalytic reduction of Cr(VI) was investigated as an engineering scale option to remove hexavalent chromium from drinking or industrial waters via a UV/titanium dioxide (TiO2) process. Using an integrated UV lamp/ceramic membrane system to recirculate TiO2, both hexavalent and total chromium levels were reduced through photocatalytic processes without additional chemicals. Cr(VI) removal increased as a function of higher energy input and TiO2 dosage, achieving above 90% removal for a 1g/L dose of TiO2. Surface analysis of effluent TiO2 confirmed the presence of chromium species.

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Created

Date Created
  • 2013

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Projection of PM2.5, BC, NOx and VOCs from the Future Vehicle Fleet: Impact of Alternative Vehicle Penetration Versus Continual Reductions in Emissions from Traditional Vehicles

Description

Mobile sources emit a number of different gases including nitrogen oxides (NOx) and volatile organic compounds (VOCs) as well as particulate matter (PM10, PM2.5). As a result, mobile sources are

Mobile sources emit a number of different gases including nitrogen oxides (NOx) and volatile organic compounds (VOCs) as well as particulate matter (PM10, PM2.5). As a result, mobile sources are major contributors to urban air pollution and can be the dominant source of some local air pollution problems. In general, mobile sources are divided into two categories: on-road mobile sources and non-road mobile sources. In Maricopa County, the Maricopa County Air Quality Department prepares inventories of all local sources [11], [12]. These inventories report that for Maricopa County, on-road mobile sources emit about 23% of total PM2.5 annually, 58% of the total NOx, and 8% of the total VOCs. To understand how future changes how vehicles might impact local air quality, this work focuses on comparing current inventories of PM2.5, black carbon (BC), NOx, and VOCs to what may be expected emissions in future years based on different scenarios of penetration of hybrid gas-electric vehicles (HEV) and electric vehicles (EV) as well as continued reduction in emissions from conventional internal combustion (IC) vehicles. A range of scenarios has been developed as part of this thesis based on literature reports [6], [8], air quality improvement plan documentation [5], projected vehicle sales and registration [3], [4], as well as using EPA’s Motor Vehicle Emission Simulator (MOVES) [9]. Thus, these created scenarios can be used to evaluate what factors will make the most significant difference in improving local air quality through reduced emissions of PM2.5, BC, NOx and VOCs in the future. Specifically, the impact of a greater fraction of cleaner alternative vehicles such as hybrid-electric and electric vehicles will be compared to the impact of continual reductions in emissions from traditional internal combustion vehicles to reducing urban air pollution emissions in Maricopa County.

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Created

Date Created
  • 2020

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New editions of G. P. Telemann's Sonata in F minor TWV 41:f1 and N. A. Rimsky-Korsakov's Concerto for trombone

Description

Nikolay Andreyevich Rimsky-Korsakov’s Concerto for Trombone and Military Band and Georg Philipp Telemann’s Sonata in F minor TWV 41:f1 are two works from contrasting periods written by well-known composers. International

Nikolay Andreyevich Rimsky-Korsakov’s Concerto for Trombone and Military Band and Georg Philipp Telemann’s Sonata in F minor TWV 41:f1 are two works from contrasting periods written by well-known composers. International Music Company first published the Sonata in 1968 for trombone, edited by Allen Ostrander. Rimsky-Korsakov’s Concerto for Trombone was first published in the United States by Leeds Music Corporation in 1952, edited by Davis Shuman. Both of these compositions contain editorial concerns that detract from each composer’s original music.

In most modern editions, Rimsky-Korsakov’s Concerto is accompanied by a piano reduction made by Nikolay Sergeyevich Fedoseyev. Although this reduction is the most commonly used accompaniment today, it is overly difficult for the pianist. The reduction also alters musical gestures within the accompaniment written by Rimsky-Korsakov.

This project contrasts modern editions of each composition with their oldest known manuscript. For Telemann’s Sonata, this is the first publication in Der Getreue Music-Meister, published by the composer in 1728-29. For Rimsky-Korsakov’s Concerto, this is a copyist’s manuscript that is currently housed at the library of the Moscow State Academic Philharmonic. The centerpiece of this project is the preparation of new solo parts for each work and a new piano reduction for Rimsky-Korsakov’s Concerto that restores the composer’s original intentions and makes clear editorial changes and suggestions.

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Created

Date Created
  • 2016

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A New Piano Reduction of the Antonin Dvořák Concerto for Cello and Orchestra in B minor Op.104

Description

The process of learning orchestra reductions on the piano is rather different from learning a piece originally written for the piano. Even though Dvořák’s Concerto for Cello and Orchestra in

The process of learning orchestra reductions on the piano is rather different from learning a piece originally written for the piano. Even though Dvořák’s Concerto for Cello and Orchestra in b minor is among the most performed works for cello and orchestra, and has been transcribed carefully by both the composer and other editors, the existing piano reductions are not always representative of many important aspects of the original orchestral score. Some reductions have large portions with unplayable or uncomfortable passages for pianists, or imprecise notations compared to the original orchestration, such as inaccurate indications for dynamics, rhythms, and notes. In rehearsal and performance, the pianist is challenged to adapt and transform one of the existing reductions into a playable and productive piano reduction, one which creates Dvořák’s full orchestral sonorities while retaining clarity of voicing. The resulting sound can be infinite in variety, as individual decisions and reductions may differ greatly. This paper will explore the following: how to reduce this orchestral score and solve the technical problem involved in orchestral writing for piano while effectively producing the sound of the orchestra in the piano reduction. There will be a literature review on important published reductions and a brief history of the work and composer. While it is not possible to discuss in detail each passage that has been revised or altered, this paper will focus on and analyze representative and substantial passages, including the perspective of two different reductions: Bärenreiter (2011) and Bärenreiter Praha (2004). It will provide a detailed demonstration of each example and will make suggestions for changes which will concentrate on capturing the essence of the orchestral score at the piano. Chapter one introduces and presents current editions. Chapters two, three and four will discuss each movement of the concerto with detailed explanations about changes in certain passages and sections. The appendix will feature a new revised reduction of Dvořák’s Cello concerto in B minor.

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Created

Date Created
  • 2020

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A New Piano Reduction of the Glazunov Concerto for Violin and Orchestra in A minor Op. 82

Description

Every collaborative pianist encounters unrealistic and unsuccessful piano reductions of orchestral and operatic compositions on a regular basis. In some cases, the reductions were realized by the composers themselves, and

Every collaborative pianist encounters unrealistic and unsuccessful piano reductions of orchestral and operatic compositions on a regular basis. In some cases, the reductions were realized by the composers themselves, and therefore may contain all the notes from the full score, but might not be realistic piano reductions. Other times, the reductions may have been made by an editor who might arrange the piano part according to their own physical abilities, experience, or taste, but might ignore essential elements of the original orchestration. Alexander Glazunov’s Concerto for Violin and Orchestra, Op. 82 is frequently performed by students and professional violinists alike. The existing piano reduction of the concerto was written by the composer himself. However, the reduction has various issues that make performing this composition challenging for pianists. The main purpose of this paper is not the simplification of the existing reduction, but the creation of a new reduction that is more pianistic and approachable, yet more true to Glazunov’s dynamic and expressive orchestration. The first chapter of this project is an introduction to and comparison of currently available editions. An overview of the composer’s biography and the historical background of the composition comprise the second chapter. Chapters three, four and five are dedicated to each respective movement of the concerto, with explanations and details about certain editorial decisions. The appendix features a new piano reduction of Glazunov’s Violin Concerto in its entirety.

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Created

Date Created
  • 2019

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Phase noise reduction using active biasing

Description

An investigation of phase noise in amplifier and voltage-controller oscillator (VCO) circuits was conducted to show that active direct-current (DC) bias techniques exhibit lower phase noise performance than traditional resistive

An investigation of phase noise in amplifier and voltage-controller oscillator (VCO) circuits was conducted to show that active direct-current (DC) bias techniques exhibit lower phase noise performance than traditional resistive DC bias techniques. Low-frequency high-gain amplifiers like those found in audio applications exhibit much better 1/f phase noise performance and can be used to bias amplifier or VCO circuits that work at much higher frequencies to reduce the phase modulation caused by higher frequency devices. An improvement in single-side-band (SSB) phase noise of 15 dB at offset frequencies less than 50 KHz was simulated and measured. Residual phase noise of an actively biased amplifier also exhibited significant noise improvements when compared to an equivalent resistive biased amplifier.

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Created

Date Created
  • 2010