Global ETD Search

1	Wireless Surface Acoustic Wave Sensor for PM2.5 Detection Mamidipally, Sai Karthik 05 1900 (has links) Currently, there is no equipment to measure the real-time fit of EHMR or N-95masks which are used in harsh environments. Improper fit of these EHMRs or N-95 masks exposes the personnel to hazardous environments. Surface acoustic wave (SAW) sensors have been around for few decades and are being used in various applications. In this work, real-time PM2.5 detection using passive wireless SAW sensors is presented. The design of meander antenna at 433MHz for wireless interrogation of SAW sensor using HFSS and ADS is also presented in this thesis. This works also includes the design of YZ-lithium niobate SAW sensor including COMSOL simulation. surface acoustic wave sensor SAW meander antenna 433MHz antenna SAW COMSOL simulation YZ-lithium niobate PM2.5 sensor. Engineering, Electronics and Electrical
2	Redox active tyrosines in photosystem II: role in proton coupled electron transfer reactions Keough, James M. 07 January 2013 (has links) Proton coupled electron transfer reactions often involve tyrosine residues, because when oxidized, the phenolic side chain deprotonates. Tyrosine Z (YZ) is responsible for extracting electrons in a stepwise fashion from the oxygen evolving-complex in order to build enough potential to oxidize water. This process requires that each step YZ must deprotonate and reprotonate in order to maintain the high midpoint potential that is necessary to oxidize the oxygen-evolving complex, which makes YZ highly involved in proton coupled electron transfer reactions. In this thesis YZ has been studied within oxygen-evolving photosystem II utilizing electron paramagnetic resonance spectroscopy to monitor the tyrosyl radical that is formed upon light excitation. Kinetic analysis of YZ has shed light on the factors that are important for PSII to carry out water oxidation at the oxygen-evolving complex. Most notably the strong hydrogen-bonding network and the midpoint potential of YZ have been shown to be integral aspects of the water splitting reactions of PSII. By studying YZ within oxygen-evolving PSII, conclusions are readily applied to the native system. Photosystem II Tyrosine Z Tyrosine D YZ YD Water oxidation Photosynthesis Power resources Research Photosynthetic reaction centers
3	Integrationsprojekte als Aufgabe urbaner Forstwirtschaft / Integrative Projects as a Task of Urban Forestry Vering, Katharina 17 September 2007 (has links) No description available. 500 Naturwissenschaften YO-YZ YY000 YYU000 Forest Sciences and Forest Ecology Urbane Forstwirtschaft Soziale Integration Stadtforstverwaltung Integrationsprojekte Problemgruppen Fallstudien Soziale Nachhaltigkeit Kooperation Urban Forestry social integration municipal forest administration integrative projects marginal groups case studies social sustainability cooperation 48

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