456 research outputs found
Single-Polarization Cladding-Pumped Optical Amplifier Without Polarization-Maintaining Gain Fiber
No full textWe demonstrate a single-polarization cladding-pumped Er : Yb optical amplifier using a dual-pass design with a Faraday rotator mirror and nonpolarization-maintaining gain fiber. Over a 25-nm range centered at 1562 nm, the amplifier output exceeds 1 W and maintains a polarization extinction ratio greater than 22 dB. We investigate enhanced relative intensity noise inherent in the dual-pass configuration and discuss scaling to higher powers
Rydberg atoms in an oscillating field : extracting classical motion from quantum spectra
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.Includes bibliographical references (p. 191-199).by Neal W. Spellmeyer.Ph.D
High-Rate Quantum Key Distribution with Superconducting Nanowire Single Photon Detectors
No full textWe demonstrate the potential for 1.85 Mbit/s secure key rates over 101 km of fiber, >100 times faster than previously demonstrated, using the differential phase shift quantum key distribution protocol and superconducting nanowire single-photon detectors
The Association Analysis of a Lichen Dominated Raised Beach System in Subarctic Ontario
No full textTitle: The Association Analysis of a Lichen Dominated Raised Beach System in Subarctic Ontario, Author: Michael W. Neal, Location: ThodeA modified version of the Braun-Blanquet technique
for the analysis of plant associations was applied to an
area of lichen dominated raised beach system at Cape
Henrietta Maria in subarctic Ontario. Eleven such associations
were extracted on this basis. Subsequently the
data was subjected to principal components ordination
methods from which it was concluded that the number of
associations be reduced to nine. With the aid of
multiple regression trend surface analysis a number of
hypotheses concerning the ecological factors underlying
the distribution of vegetation in the area were suggested,
namely, that the associations are controlled by gradients
of pH, the thickness of the underlying peaty substratum,
and the distribution of late snow lie zones.ThesisMaster of Science (MS
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Death on the Lonely Llano Estacado: The Assassination of J. W. Jarrott, a Forgotten Hero
No full textIn the winter of 1901, James W. Jarrott led a band of twenty-five homesteader families toward the Llano Estacado in far West Texas, newly opened for settlement by a populist Texas legislature. But frontier cattlemen who had been pasturing their herds on the unfenced prairie land were enraged by the encroachment of these “nesters.” In August 1902 a famous hired assassin, Jim Miller, ambushed and murdered J. W. Jarrott. Who hired Miller? This crime has never been solved, until now.
Award-winning author Bill Neal investigates this cold case and successfully pieces together all the threads of circumstantial evidence to fit the noose snugly around the neck of Jim Miller’s employer. What emerges from these pages is the strength of intriguing characters in an engrossing narrative: Jim Jarrott, the diminutive advocate who fearlessly champions the cause of the little guy. The ruthless and slippery assassin, Deacon Jim Miller. And finally Jarrott’s young widow Mollie, who perseveres and prospers against great odds and tells the settlers to “Stay put!
Bungalow in the pines
No full textA color postcard of a wooden cottage in the woods captioned "A Bungalow in the Pines, Rehoboth Beach Del." Mr. Charles W. Powers of Washington D.C., received this postcard from C. The author wrote that they received Powers' card and were glad to hear from him. They wrote that they did not understand what Powers meant when he said their hands were too full to write. The sender writes they will be home on Monday evening and wanted to hear from Powers. Horn's of Rehoboth Beach, Delaware, published this postcard. A postmark on the back indicates that this postcard was mailed from Rehoboth Beach, Delaware. The postage stamp is a one-cent U.S. #357, Benjamin Franklin. The back of the postcard is labeled 0772 and 27.50
Bungalow in the pines
No full textA color postcard of a wooden cottage in the woods captioned "A Bungalow in the Pines, Rehoboth Beach Del." Mr. Charles W. Powers of Washington D.C., received this postcard from C. The author wrote that they received Powers' card and were glad to hear from him. They wrote that they did not understand what Powers meant when he said their hands were too full to write. The sender writes they will be home on Monday evening and wanted to hear from Powers. Horn's of Rehoboth Beach, Delaware, published this postcard. A postmark on the back indicates that this postcard was mailed from Rehoboth Beach, Delaware. The postage stamp is a one-cent U.S. #357, Benjamin Franklin. The back of the postcard is labeled 0772 and 27.50
Episcopal Church on Olive Avenue, Rehoboth
No full textA color postcard of a church with a steeply sloped roof and tall bell tower. There are four children outside of the church on the sidewalk. The text on the front informs the reader that the image is from Olive Avenue, showing the Episcopal Church in Rehoboth Beach, Delaware. Mrs. E. W. Hastings of Delmar, Delaware, received this postcard. The sender wrote to tell Mrs. Hastings that if she intended to visit that, she should get to them by 11 o'clock. The author did not know what time the event would start. They informed Mrs. Hastings that there was a brick church to the left of the road, and she would have to turn to the right to get to them. They told her she could go to Laurel on Sunday night if she didn't visit. Louis Kaufmann & Sons published this postcard. C. T. American Art is credited. A postmark on the back indicates that this postcard was mailed from Midway, Delaware. The postage stamp is a two-cent U.S. #634, George Washington. The back of the postcard is labeled 0758 and 10.00
Episcopal Church on Olive Avenue, Rehoboth
No full textA color postcard of a church with a steeply sloped roof and tall bell tower. There are four children outside of the church on the sidewalk. The text on the front informs the reader that the image is from Olive Avenue, showing the Episcopal Church in Rehoboth Beach, Delaware. Mrs. E. W. Hastings of Delmar, Delaware, received this postcard. The sender wrote to tell Mrs. Hastings that if she intended to visit that, she should get to them by 11 o'clock. The author did not know what time the event would start. They informed Mrs. Hastings that there was a brick church to the left of the road, and she would have to turn to the right to get to them. They told her she could go to Laurel on Sunday night if she didn't visit. Louis Kaufmann & Sons published this postcard. C. T. American Art is credited. A postmark on the back indicates that this postcard was mailed from Midway, Delaware. The postage stamp is a two-cent U.S. #634, George Washington. The back of the postcard is labeled 0758 and 10.00
Peptide-modified surfaces for enzyme immobilization.
No full textBACKGROUND: Chemistry and particularly enzymology at surfaces is a topic of rapidly growing interest, both in terms of its role in biological systems and its application in biocatalysis. Existing protein immobilization approaches, including noncovalent or covalent attachments to solid supports, have difficulties in controlling protein orientation, reducing nonspecific absorption and preventing protein denaturation. New strategies for enzyme immobilization are needed that allow the precise control over orientation and position and thereby provide optimized activity. METHODOLOGY/PRINCIPAL FINDINGS: A method is presented for utilizing peptide ligands to immobilize enzymes on surfaces with improved enzyme activity and stability. The appropriate peptide ligands have been rapidly selected from high-density arrays and when desirable, the peptide sequences were further optimized by single-point variant screening to enhance both the affinity and activity of the bound enzyme. For proof of concept, the peptides that bound to β-galactosidase and optimized its activity were covalently attached to surfaces for the purpose of capturing target enzymes. Compared to conventional methods, enzymes immobilized on peptide-modified surfaces exhibited higher specific activity and stability, as well as controlled protein orientation. CONCLUSIONS/SIGNIFICANCE: A simple method for immobilizing enzymes through specific interactions with peptides anchored on surfaces has been developed. This approach will be applicable to the immobilization of a wide variety of enzymes on surfaces with optimized orientation, location and performance, and provides a potential mechanism for the patterned self-assembly of multiple enzymes on surfaces
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