Browsing ETDs: Virginia Tech Electronic Theses and Dissertations by Title
Now showing items 26585-26604 of 38450
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The P Cluster of the Azotobacter vinelandii Nitrogenase Complex: Effects of Substitution at the Cluster-bridging Residue, a-Cys88
(Virginia Tech, 1998-01-01)The major focus of the research in our laboratory is the investigation of the role of the nitrogenase component, theMoFe protein, in the catalytic mechanism of biological nitrogen fixation. This dissertation research centers ... -
P50 Sensory Gating: Impact of High Vs Low Schizotypy Personality and Smoking Status
(Virginia Tech, 2004-09-01)Sensory gating helps prevent incoming irrelevant sensory information from entering into the higher cortex and ensures normal information processing. Sensory gating is seen as the ability of the nervous system to modulate ... -
Packaging and Magnetic Integration for Reliable Switching of Paralleled SiC MOSFETs
(Virginia Tech, 2018-08-03)Silicon carbide (SiC) outperform Si chips in terms of high blocking voltage capability, low on-resistance, high-temperature operation, and high switching frequency. Several SiC MOSFETs are usually paralleled to increase ... -
Packaging of a High Power Density Point of Load Converter
(Virginia Tech, 2013-03-29)Due to the power requirements for today's microprocessors, point of load converter packaging is becoming an important issue. Traditional thermal management techniques involved in removing heat from a printed circuit board ... -
Packaging of Enhancement-Mode Gallium Nitride High-Electron-Mobility Transistors for High Power Density Applications
(Virginia Tech, 2022-06-27)Gallium nitride (GaN) high-electron-mobility transistors (HEMTs) are favored for their smaller specific on-resistance, lower switching losses, and higher theoretical temperature limits as compared to traditional silicon ... -
Packed capillary columns for liquid chromatography
(Virginia Tech, 1990)The advantages and disadvantages of packed capillary columns for high performance liquid chromatography are examined. Historically, the advantages are smaller sample and phase consumption, enhancement in sensitivity, easy ... -
Paclitaxel-induced macrophage activities in the tumor-bearing host: immunologic implications and therapeutic applications
(Virginia Tech, 1998-12-18)Tumors induce immune dysfunction through the production of soluble factors that subvert macrophage (Mf) function to favor tumor growth. Previous studies suggested that tumor-induced immune cell dysfunction may be reversible ... -
PACTIGHT: Tightly Seal Sensitive Pointers with Pointer Authentication
(Virginia Tech, 2021-12-02)ARM is becoming more popular in desktops and data centers. This opens a new realm in terms of security attacks against ARM, increasing the importance of having an effective and efficient defense mechanism for ARM. ARM has ... -
A paging scheme for pointer-based quadtrees
(Virginia Tech, 1992-05-19)The quadtree is a family of data structures that organize spatial data using recursive subdivision. A pointer-based quadtree uses an explicit tree structure to represent the subdivision, while a linear quadtree holds a ... -
Pain, courage, and wisdom: stories of women living with HIV
(Virginia Tech, 1995-04-05)This is a descriptive study of women with Human Immune Deficiency Virus (HIV)/Acquired Immune Deficiency Syndrome (AIDS). Women have been neglected in social science research and literature on HIV/AIDS (Anastos & Marte, ... -
"The Painful Task of Thinking Belongs To Me:" Rethinking Royal Navy Signal Reform during the American War of Independence
(Virginia Tech, 2021-06-08)This thesis examines the context and causes of signal reform in the British Royal Navy during the American War of Independence. It argues that changes in the ethos of the officer corps before and during the American War ... -
Painterly Conception of Architecture
(Virginia Tech, 2005-07-20)The art of painting opens vast expressive possibilities for architecture, wherein architecture can produce a more conducive atmosphere for the contemplation of painting. The subtle affinities between the two fields stirred ... -
Palatability and digestibility of grasses treated with gibberellic acid
(Virginia Polytechnic Institute, 1962)Experiments were conducted to study the effect of gibberellic acid on palatability and digestibility of two grasses, orchard grass and Kentucky 31 fescue. The GA was applied as a spray, except one granular application, at ... -
The palatability and nutrient value of tall fescue (Festuca arundinacea Schreb.) forage and evaluation of seven systems of forage finishing beef steers
(Virginia Tech, 1978-09-07)Most cattlemen in the Southeast are in the cow-calf business and sell calves at weaning. The extra cost of shipping feeder calves for finishing and then shipping the carcasses back to the East adds to the price of meat. ... -
Paleobiology of the Early Cambrian Yanjiahe Formation in Hubei Province of South China
(Virginia Tech, 2013-05-23)Fossils recovered from limestones of the lower Cambrian (Stage 2-3) Yanjiahe Formation in Hubei Province, South China, recovered using acetic acid maceration, fracturing, and thin sectioning techniques were examined using ... -
Paleobiology, Biostratigraphy, and Taphonomy of Neoproterozoic Eukaryotes and Cambrian Animals with Carbonaceous Preservation
(Virginia Tech, 2018-12-03)Carbonaceous fossil preservation is an important taphonomic window that provides critical perspectives on the evolutionary history of life. However, phylogenetic interpretation of carbonaceous fossils is not straightforward. ... -
Paleocommunities of the Yorktown Formation (Pliocene) of Virginia
(Virginia Tech, 1999-08-06)The fossiliferous Yorktown Formation (Pliocene) of Virginia was used as a natural laboratory for testing predictions of ecological and evolutionary theories. Specifically, coordinated stasis and ecological locking models ... -
Paleoecology and Taphonomy of Ediacaran macrofossils from the Khatyspyt Formation, Olenek Uplift, Siberia
(Virginia Tech, 2017-09-29)The Ediacaran Period (635 – 541 Ma) is a critical transition in the history of the Earth and life. It is marked by the appearance of enigmatic Ediacara-like fossils and macroalgae, which had existed since the early ... -
The paleoecology of the Keyser limestone: a re-evaluation
(Virginia Polytechnic Institute and State University, 1985)Makurath (1977), in studying the Keyser Limestone, concluded that brachiopods were distributed randomly, casting doubt over the validity of using recurrent communities as a paleoenvironmental tool. However, a re-evaluation ... -
Paleoenvironmental Reconstruction of a Coastal Lagoon in Southwestern Dominican Republic
(Virginia Tech, 2007-06-13)The study of lake sediments can provide valuable insights into lake history and climate variation throughout time. In-depth studies have been carried out at Lake Miragoane, Haiti and in high- and mid-elevation sites in the ...
