26,411 research outputs found
Jonathan B. Reedy letter to John M. Holstine
No full text1/23/1865Holstine, John M.In this letter, Jonathan Bensing Reedy writes to John M. Holstine about the weather, his wish he could help Holstine with the harvest, and the price of various goods in Norfolk, Virginia.Norfolk, Virgini
Data for "Temperature induced modal changes of high power rod-type Yb-fiber amplifiers under various pump geometries and with noisy pump lasers"
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Jonathan Swift: Defeat, Isolation, and the Price of Failed Norms
No full textStarting with Jonathan Swift’s famous letter on the ‘falsity’ of the notion of man as ‘animal rationale’, this article investigates the role of norms and the normative in his works. The essay especially considers A Tale of a Tub, Gulliver’s Travels, the mock Marlborough-eulogy, the final ‘Stella’ poem, and the Verses on the Death of Dr. Swift. The several matters considered include Swift’s major concerns and sources of his own infelicity, such as his recollection of regicide and usurping Dissent; the threat on the established Church by a later new dynasty; his removal from England and modest political career; his fear of Irish Presbyterians and the love-hate relationship with Ireland; his poor health and long periods of physical and psychological discomfort; and the role of the concept of original sin had in his works. It then deals with Swift’s sense of collapse and loss of order before the presumed moral barbarism of his age, and his desire to resist the gloomy negative forces of history, for all of which Swift pays a high price. Finally, the article sees Swift’s greatness in his desire to continue to fight despite his unhappiness with the world; in his portrayal of the consequences of ignoring the very norms which he unpheld; and in his refusal to stop labeling corruption, wherever it might be
Supercontinuum decoherence due to XPM-assisted Raman amplification in normal dispersion fibers for polarization or wavelength offset pulses
No full textWe report the importance of cross-phase modulation (XPM) on the coherence of a low-energy probe pulse co-propagating with a high-energy pump pulse which generates incoherent supercontinuum in all-normal dispersion (ANDi) fiber due to Raman amplification of quantum noise. By investigating numerous fiber and pulse parameters we show consistently that for weak probe pulses the XPM from the pump is the dominant influence on the degradation of the probe coherence. We show that the faster decoherence at the pump leading edge means that the probe coherence is reduced more significantly when the probe has a higher group velocity, i.e., when an orthogonally-polarized probe is aligned to the fast (lower refractive index) axis of the fiber or when a co-polarized probe has a longer central wavelength. Simulations show that this effect occurs for both polarization maintaining (PM) and non-PM ANDi fibers and can result in a probe decoherence rate which is higher than that of the pump. These previously unreported results extend our earlier scalar simulations showing incoherent supercontinuum within a single pulse
Limits of coherent supercontinuum generation in normal dispersion fibers
No full textWe study the largely unexplored transition between coherent and noise-seeded incoherent continuum generation in all-normal dispersion (ANDi) fibers and show that highly coherent supercontinua with spectral bandwidths of one octave can be generated with long pump pulses of up to 1.5 ps duration, corresponding to soliton orders of up to N = 600. In terms of N, this corresponds to an approximately 50 times increase of the coherent regime compared to anomalous dispersion pumping. In the transition region between coherent and incoherent spectral broadening we observe the manifestation of nonlinear phenomena that we term incoherent cloud formation and incoherent optical wave breaking, which lead to a gradual or instantaneous coherence collapse of SC spectral components, respectively. The role played by stimulated Raman scattering and parametric four-wave mixing during SC generation in ANDi fibers is shown to be more extensive than previously recognized: their nonlinear coupling contributes to the suppression of incoherent dynamics at short pump pulse durations, while it is responsible for non-phasematched parametric amplification of noise observed in the long pulse regime. We further discuss the dependence of SC coherence on fiber design, and present basic experimental verifications for our findings using single-shot detection of SC spectra generated by picosecond pulses. This work outlines both the further potential as well as the limitations of broadband coherent light source development for applications such as metrology, nonlinear imaging, and ultrafast photonics, amongst others
Dataset for 'Overlapped pulsed pumping of tandem pumped fiber amplifiers to increase achievable pulse energy'
No full textDataset for the article:
A. Malinowski, J. H. V. Price and M. N. Zervas, "Overlapped Pulsed Pumping of Tandem Pumped Fiber Amplifiers to Increase Achievable Pulse Energy," in IEEE Journal of Quantum Electronics, vol. 53, no. 2, pp. 1-8, April 2017.
doi: 10.1109/JQE.2017.2657334
It has been reported previously that in the regime appropriate for amplifying femtosecond pulses using the chirped pulse amplification technique in Yb-fiber sources that sub-micro-second pulsed tandem pumping not only provides the thermal benefits of c.w. tandem pumping, but also enables strong suppression of ASE. In that case, the pump pulse preceded the signal pulse train. Here, we propose a tandem pumping scheme in rare-earth-doped fiber amplifiers, where a train of signal pulses is amplified by a pump pulse, which is almost exactly temporally overlapped. Simulations demonstrate that this can be used to create uniform gain across the signal pulse train, even at very high total pulse energies, where there would be significant gain shaping in the previous case. In addition, the pump is absorbed in a much shorter length, which increases the threshold for nonlinear effects and gain of greater than 26 dB is shown to be readily achievable in an amplifier as short as 1.5 m. This results in increased extractable energy before reaching the threshold for limiting nonlinear effects, such as stimulated Raman scattering. These attributes should be attractive for high energy, high average power, ultrashort pulse, coherently combined fiber laser systems.</span
A Fast Binary Splitting Approach to Non-Adaptive Group Testing
No full textIn this paper, we consider the problem of noiseless non-adaptive group testing under the for-each recovery guarantee, also known as probabilistic group testing. In the case of n items and k defectives, we provide an algorithm attaining high-probability recovery with O(k log n) scaling in both the number of tests and runtime, improving on the best known O(k² log k ⋅ log n) runtime previously available for any algorithm that only uses O(k log n) tests. Our algorithm bears resemblance to Hwang’s adaptive generalized binary splitting algorithm (Hwang, 1972); we recursively work with groups of items of geometrically vanishing sizes, while maintaining a list of "possibly defective" groups and circumventing the need for adaptivity. While the most basic form of our algorithm requires Ω(n) storage, we also provide a low-storage variant based on hashing, with similar recovery guarantees
Dataset for Single-Shot Phase and Amplitude Fluctuations of Narrow-Line Pulse Bursts in Divided-Pulse Amplifier
No full textThis dataset supports the article Lin, H., Feng, Y., Price, J., & Nilsson, J. (2019). Single-shot phase and amplitude fluctuations of narrow-linewidth pulse bursts in divided pulse amplifier. IEEE Photonics Technology Letters, 31(20), 1662 - 1665. DOI: 10.1109/LPT.2019.2942175</span
Price hedonics: a critical review
No full textThis paper was presented at the conference "Economic Statistics: New Needs for the Twenty-First Century," cosponsored by the Federal Reserve Bank of New York, the Conference on Research in Income and Wealth, and the National Association for Business Economics, July 11, 2002. The main objective of this paper is to make a start in the evaluation of price hedonics. The author describes the hedonic model and reviews its main uses, because the credibility of price hedonics depends in part on the current state of academic research. This is a brief overview. The author then turns to some of the standard criticisms of price hedonics and moves into the uncharted waters of the political economy of price measurement.Statistics ; Prices ; Consumer price indexes
Description of author Lisa Price\u27s hiking trip through the Hundred Mile Wilderne
No full textDescription of author Lisa Price\u27s hiking trip through the Hundred Mile Wilderness, the final section of the Appalachian Trail in Maine. Price, who has hiked the Appalachian Trail for four years, one section at a time, meets up with fellow hikers Noel and Caroline at Shaw\u27s Boarding House in Monson, and the three reach the summit of Mount Katahdin together
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