Browsing Articles by Title
Now showing items 783-802 of 846
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Tunable holmium-doped fiber laser with multiwatt operation from 2025 nm to 2200 nm
(2019-11-18)The emission band of holmium-doped silica fibers extends beyond 2200 nm, which means these lasers have the potential of covering considerable parts of the atmospheric transmission window between ∼2100 nm and 2250 nm. ... -
Turbulence characterization and image processing data sets from a NATO RTO SET 165 trial in Dayton, Ohio, USA
(2012)The performance of optical systems is degraded by atmospheric turbulence. Over propagation distances that exceed several kilometers, it is difficult to evaluate its impact because of terrain variability - a factor that ... -
Two medical therapies very effective shortly after high levels of soman poisoning in rats, but only one with universal utility
(2013)A treatment regimen consisting of HI-6, scopolamine, and physostigmine (termed the physostigmine regimen) has been based on the serendipitous discovery that it exerts powerful antidotal effects against high levels of soman ... -
Typical Products for Outside Audiences: The Role of Typicality When Products Traverse Countries
(2022-12-02)While organization theorists have established the importance of typicality, most studies examine situations where producers and audiences dwell within the same category system (e.g., a country, industry, or market). ... -
Tyske reaksjoner på Ukraina-krigen: en ny kraft for transatlantisk samarbeid?
(2023-05-02)Det russiske angrepet på Ukraina 24. februar 2022 er ikke bare et angrep på landets territoriale integritet og 44 millioner innbyggere. Angrepet er også et angrep på den europeiske og transatlantiske sikkerhetsordenen ... -
Ultrafast Pulse Compression in Bulk with > 20 Times Spectral Broadening Factor from a Single Stage
(2021-11-01)We introduce the combination of multi-pass cell and multi-plate spectral broadening. We demonstrate the compression of 110-μJ pulses from 900-fs to 60-fs in a single stage and report broadening to 38-fs transform-limit by ... -
Ultrawideband Gated Step Frequency Ground-Penetrating Radar
(2012)We describe a prototype ultrawideband radar. We show how the system was designed and how the hardware was developed for the radar prototype. Waveform generation, radar parameters, and signal processing for the stepped ... -
Ultrawideband underwater acoustic communication channels
(2013)Traditional channel models for communications research are designed for narrowband systems. Underwater acoustic communication systems use a bandwidth that is not small compared with the center frequency of the signal and ... -
Under-ice mid-frequency acoustic transmissionand communication in two Arctic Oceanenvironments
(2023-02-23)This paper presents data from mid-frequency (4−8 kHz) under-ice acoustic transmission and communication experiments in the Nansen Basin and in the Beaufort Sea of the Arctic Ocean. Measured impulse responses to range ~10 ... -
Understanding Influence Operations in Social Media: A Cyber Kill Chain Approach
(2020-11-14)Discussions about recent state-run influence operations in social media often focus only on quantitative elements—the number of people interacting with fake news or how many tweets were sent by bots. This article suggests ... -
Understanding the Threat of Nuclear, Biological and Chemical Warfare
(2021)Weapons of mass destruction are not merely Cold War relics. Recent years have seen the use of biological and chemical agents in the United States, Syria, Malaysia and the United Kingdom. The faltering of strategic arms ... -
Underwater Acoustic Communications: Long-Term Test of Turbo Equalization in Shallow Water
(2008)Acoustic telemetry sea trials lasting for three months with experiment periods of 7 h have been carried out, using a turbo receiver. The communication channel is shallow; the depth is approximately 10 m, and the range is ... -
Underwater Acoustic Network Simulation With Lookup Tables From Physical-Layer Replay
(2015)An underwater acoustic network simulation methodology is presented that is based on lookup tables (LUTs) with physical-layer error ratios. These LUTs are prepared with a validated replay channel simulator, which is here ... -
Uniform semiglobal exponential stability of integral line-of-sight guidance laws
(2015)This paper proves that an integral line-of-sight guidance law for path following control of underactuated marine vessels provides uniform semiglobal exponential stability. The stability result is stronger than what has ... -
Uniformly stable wavelets on nonuniform triangulations
(2016)In this paper we construct linear, uniformly stable, wavelet-like functions on arbitrary triangulations. As opposed to standard wavelets, only local orthogonality is required for the wavelet-like functions. Nested ... -
Unimolecular Decomposition Reactions of Picric Acid and its Methylated Derivatives — A DFT Study
(2022-04-26)To handle energetic materials safely, it is important to have knowledge about their sensitivity. Density functional theory (DFT) has proven a valuable tool in the study of energetic materials, and in the current work, DFT ... -
An upper-bound metric for characterizing spectral and spatial coregistration errors in spectral imaging
(2012)Coregistration errors in multi- and hyperspectral imaging sensors arise when the spatial sensitivity pattern differs between bands or when the spectral response varies across the field of view, potentially leading to large ... -
Uptake and effects of 2, 4, 6 - trinitrotoluene (TNT) in juvenile Atlantic salmon (Salmo salar)
(2017)Organ specific uptake and depuration, and biological effects in Atlantic salmon (Salmo salar) exposed to 2, 4, 6-trinitrotoluene (TNT) were studied. Two experiments were conducted, the first using radiolabeled TNT (14C-TNT, ... -
Urban Terrorism in the Arab World: Introducing a Dataset of Jihadist Attack Plots in Jordan
(2021-09-21)Few regions have been more plagued by terrorism than the Arab world. However, knowledge of the phenomenon’s nature is limited by a lack of attack plot data for most Arab countries. This article contributes to addressing ...