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Articles 1 - 11 of 11
Full-Text Articles in Entire DC Network
Sound Absorption Properties Of Functionally Graded Polyurethane Foams, Olivier Doutres Ph.D., Noureddine Atalla Pr.
Sound Absorption Properties Of Functionally Graded Polyurethane Foams, Olivier Doutres Ph.D., Noureddine Atalla Pr.
Olivier Doutres Ph.D.
Noise control over a wide frequency band is an increasingly important design criterion in the building and transport industries. Examples of well known broadband passive concepts for optimal sound absorption are multi-layering with graded properties across the thickness and optimization of the material shape (e.g., wedges). However, for typical applications, the material thickness is limited and shaping or use of different material costly. Thus, there is growing interest for developing acoustical materials having microstructure properties gradient at the micro- or meso-scale; also known as Functionally Graded Materials (FGM). Even if sophisticated models are available to predict the acoustic behavior of …
Analysis Of The Early-Time Optical Spectra Of Sn 2011fe In M101, J. T. Parrent, D. A. Howell, B. Friesen, R. C. Thomas
Analysis Of The Early-Time Optical Spectra Of Sn 2011fe In M101, J. T. Parrent, D. A. Howell, B. Friesen, R. C. Thomas
Dartmouth Scholarship
The nearby Type Ia supernova SN 2011fe in M101 (cz=241 km s^-1) provides a unique opportunity to study the early evolution of a "normal" Type Ia supernova, its compositional structure, and its elusive progenitor system. We present 18 high signal-to-noise spectra of SN 2011fe during its first month beginning 1.2 days post-explosion and with an average cadence of 1.8 days. This gives a clear picture of how various line-forming species are distributed within the outer layers of the ejecta, including that of unburned material (C+O). We follow the evolution of C II absorption features until they diminish near maximum light, …
Electrical And Optical Characterization Of Si-Ge-Sn, Merle D. Hamilton
Electrical And Optical Characterization Of Si-Ge-Sn, Merle D. Hamilton
Theses and Dissertations
The electrical characterization of boron-doped p-Si0.08Ge0.90Sn0.02/p-Ge(100) and p-Si0.112Ge0.86Sn0.028/n-Si(100) with various epilayer thicknesses was measured using the Hall effect. The room temperature sheet carrier concentration ranged from 1.21 x 1013 – 1.32 x 1016 cm-2. The room temperature mobilities were measured to be between 166 and 717 cm2/V·s, depending on sample composition. In the low temperature regime, the mobility was mainly affected by ionized impurity scattering. In the high temperature regime, the mobility was mainly affected by …
On Pulsar Distance Measurements And Their Uncertainties, J. P. W. Verbiest, J. M. Weisberg, A. A. Chael, K. J. Lee, D. R. Lorimer
On Pulsar Distance Measurements And Their Uncertainties, J. P. W. Verbiest, J. M. Weisberg, A. A. Chael, K. J. Lee, D. R. Lorimer
Faculty & Staff Scholarship
Accurate distances to pulsars can be used for a variety of studies of the Galaxy and its electron content. However, most distance measures to pulsars have been derived from the absorption (or lack thereof) of pulsar emission by Galactic H I gas, which typically implies that only upper or lower limits on the pulsar distance are available. We present a critical analysis of all measured H I distance limits to pulsars and other neutron stars, and translate these limits into actual distance estimates through a likelihood analysis that simultaneously corrects for statistical biases. We also apply this analysis to parallax …
A Two Photon Absorption Laser Induced Fluorescence Diagnostic For Fusion Plasmas, R. M. Magee, M. E. Galante, D. Mccarren, E. E. Scime, R. L. Boivin, N. H. Brooks, R. J. Groebner, D. N. Hill, G. D. Porter
A Two Photon Absorption Laser Induced Fluorescence Diagnostic For Fusion Plasmas, R. M. Magee, M. E. Galante, D. Mccarren, E. E. Scime, R. L. Boivin, N. H. Brooks, R. J. Groebner, D. N. Hill, G. D. Porter
Faculty & Staff Scholarship
No abstract provided.
Synchrotron Radiation Spectroscopic Techniques As Tools For The Medicinal Chemist: Microprobe X-Ray Fluorescence Imaging, X-Ray Absorption Spectroscopy, And Infrared Microspectroscopy, Carolyn Therese Dillon
Synchrotron Radiation Spectroscopic Techniques As Tools For The Medicinal Chemist: Microprobe X-Ray Fluorescence Imaging, X-Ray Absorption Spectroscopy, And Infrared Microspectroscopy, Carolyn Therese Dillon
Faculty of Science - Papers (Archive)
This review updates the recent advances and applications of three prominent synchrotron radiation techniques, microprobe X-ray fluorescence spectroscopy/imaging, X-ray absorption spectroscopy, and infrared microspectroscopy, and highlights how these tools are useful to the medicinal chemist. A brief description of the principles of the techniques is given with emphasis on the advantages of using synchrotron radiation-based instrumentation rather than instruments using typical laboratory radiation sources. This review focuses on several recent applications of these techniques to solve inorganic medicinal chemistry problems, focusing on studies of cellular uptake, distribution, and biotransformation of established and potential therapeutic agents. The importance of using these …
Remote Sensing Of Co2 And Ch4 Using Solar Absorption Spectrometry With A Low Resolution Spectrometer, C Petri, T Warneke, N Jones, T Ridder, J Messerschmidt, T Weinzierl, M Geibel, J Notholt
Remote Sensing Of Co2 And Ch4 Using Solar Absorption Spectrometry With A Low Resolution Spectrometer, C Petri, T Warneke, N Jones, T Ridder, J Messerschmidt, T Weinzierl, M Geibel, J Notholt
Faculty of Science - Papers (Archive)
Throughout the last few years solar absorption Fourier Transform Spectrometry (FTS) has been further developed to measure the total columns of CO2 and CH4. The observations are performed at high spectral resolution, typically at 0.02 cm(-1). The precision currently achieved is generally better than 0.25%. However, these high resolution instruments are quite large and need a dedicated room or container for installation. We performed these observations using a smaller commercial interferometer at its maximum possible resolution of 0.11 cm(-1). The measurements have been performed at Bremen and have been compared to observations using our high resolution instrument also situated at …
Hydrogen De-/Absorption Improvement Of Nabh4 Catalyzed By Titanium-Based Additives, Jianfeng Mao, Zaiping Guo, Ivan P. Nevirkovets, Hua-Kun Liu, S. X. Dou
Hydrogen De-/Absorption Improvement Of Nabh4 Catalyzed By Titanium-Based Additives, Jianfeng Mao, Zaiping Guo, Ivan P. Nevirkovets, Hua-Kun Liu, S. X. Dou
Faculty of Engineering - Papers (Archive)
NaBH4 is considered as a promising candidate material for solid-state hydrogen storage due to its high hydrogen content of 10.6 wt %. However, its practical use is hampered by its high thermodynamic stability and slow H-exchange kinetics. In the present work, the effects of Ti-based additives, including Ti, TiH2, and TiF3, on the dehydrogenation and rehydrogenation of NaBH4 (NaH+B) were investigated. It was revealed that all of the titanium-based additives were effective in improving the hydrogen desorption and absorption reactions of NaBH4, and, among them, TiF3 possessed the highest catalytic activity. The whole dehydrogenation process for the NaBH4–0.05TiF3 sample can …
In Silico Prediction And Simulation For Of Oral Piperine (1-Piperoyl Piperidine) Software, Chatsiri Jesadakultavee, Korbthum Sathirakul
In Silico Prediction And Simulation For Of Oral Piperine (1-Piperoyl Piperidine) Software, Chatsiri Jesadakultavee, Korbthum Sathirakul
The Thai Journal of Pharmaceutical Sciences
No abstract provided.
Characterization Of Wave Transport In Non-Conservative Media With Random And Correlated Disorder, Benjamin Henry Payne
Characterization Of Wave Transport In Non-Conservative Media With Random And Correlated Disorder, Benjamin Henry Payne
Doctoral Dissertations
"Passive quasi-one-dimensional random media exhibit one of the three regimes of transport - ballistic, diffusive, or Anderson localization - depending on system size. The ballistic and diffusion approximations assumes particle transport, whereas Anderson Localization occurs when wave self-interference effects are dominant. When the system contains absorption or gain, then how the regimes can be characterized becomes unclear. By investigating theoretically and numerically the ratio of transmission to energy in a random medium in one dimension, we show this parameter can be used to characterize localization in random media with gain. Non-conservative media implies a second dimension for the transport parameter …
The Green Bank Telescope H Ii Region Discovery Survey. Iii. Kinematic Distances, L. D. Anderson, T. M. Bania, Dana S. Balser, Robert T. Rood
The Green Bank Telescope H Ii Region Discovery Survey. Iii. Kinematic Distances, L. D. Anderson, T. M. Bania, Dana S. Balser, Robert T. Rood
Faculty & Staff Scholarship
Using the H I emission/absorption method, we resolve the kinematic distance ambiguity and derive distances for 149 of 182 (82%) H II regions discovered by the Green Bank Telescope H II Region Discovery Survey (GBT HRDS). The HRDS is an X-band (9 GHz, 3 cm) GBT survey of 448 previously unknown H II regions in radio recombination line and radio continuum emission. Here, we focus on HRDS sources from 67 Degree-Sign {>=} l {>=} 18 Degree-Sign , where kinematic distances are more reliable. The 25 HRDS sources in this zone that have negative recombination line velocities are unambiguously …