We report the results from a haloscope search for axion dark matter in the 3.3-4.2 μeV mass range. This search excludes the axion-photon coupling predicted by one of the benchmark models of ..."invisible" axion dark matter, the Kim-Shifman-Vainshtein-Zakharov model. This sensitivity is achieved using a large-volume cavity, a superconducting magnet, an ultra low noise Josephson parametric amplifier, and sub-Kelvin temperatures. The validity of our detection procedure is ensured by injecting and detecting blind synthetic axion signals.
This Letter reports on a cavity haloscope search for dark matter axions in the Galactic halo in the mass range 2.81-3.31 μeV. This search utilizes the combination of a low-noise Josephson parametric ...amplifier and a large-cavity haloscope to achieve unprecedented sensitivity across this mass range. This search excludes the full range of axion-photon coupling values predicted in benchmark models of the invisible axion that solve the strong CP problem of quantum chromodynamics.
Searching for axion dark matter, the ADMX Collaboration acquired data from January to October 2018, over the mass range 2.81–3.31 μeV, corresponding to the frequency range 680–790 MHz. Using an ...axion haloscope consisting of a microwave cavity in a strong magnetic field, the ADMX experiment excluded Dine-Fischler-Srednicki-Zhitnisky (DFSZ) axions at 90% confidence level and 100% dark matter density over this entire frequency range, except for a few gaps due to mode crossings. This paper explains the full ADMX analysis for run 1B, motivating analysis choices informed by details specific to this run.
The Axion Dark Matter eXperiment (ADMX) has previously excluded Dine-Fischler-Srednicki- Zhitnisky (DFSZ) axions between 680-790 MHz under the assumption that the dark matter is described by the ...isothermal halo model. However, the precise nature of the velocity distribution of dark matter is still unknown, and alternative models have been proposed. Here, we report the results of a non-virialized axion search over the mass range 2.81–3.31 µeV, corresponding to the frequency range 680–800 MHz. This analysis marks the most sensitive search for non-virialized axions sensitive to Doppler effects in the Milky Way Halo to date. Accounting for frequency shifts due to the detector’s motion through the Galaxy, we exclude cold flow relic axions with a velocity dispersion of $\mathscr{O}$(10-7)c with 95% confidence.
Following an introduction to the history of the invention of the quantum cascade (QC) laser and of the band-structure engineering advances that have led to laser action over most of the mid-infrared ...(IR) and part of the far-IR spectrum, the paper provides a comprehensive review of recent developments that will likely enable important advances in areas such as optical communications, ultrahigh resolution spectroscopy and applications to ultrahigh sensitivity gas-sensing systems. We discuss the experimental observation of the remarkably different frequency response of QC lasers compared to diode lasers, i.e., the absence of relaxation oscillations, their high-speed digital modulation, and results on mid-IR optical wireless communication links, which demonstrate the possibility of reliably transmitting complex multimedia data streams. Ultrashort pulse generation by gain switching and active and passive modelocking is subsequently discussed. Recent data on the linewidth of free-running QC lasers (/spl sim/150 kHz) and their frequency stabilization down to 10 kHz are presented. Experiments on the relative frequency stability (/spl sim/5 Hz) of two QC lasers locked to optical cavities are discussed. Finally, developments in metallic waveguides with surface plasmon modes, which have enabled extension of the operating wavelength to the far IR are reported.
Introduction Document Development Process Writing Committee Organization The writing committee was selected to represent the American College of Cardiology (ACC) and included a cardiovascular ...training program director, several active cardiovascular scientists and research methodology experts, early-career cardiologists, highly experienced research experts representing both academic and community-based practice settings, the chair of the ACC's Academic Cardiology Section Leadership Council, and a physician experienced in defining and applying training standards according to the 6 general competency domains promulgated by the Accreditation Council for Graduate Medical Education (ACGME) and American Board of Medical Specialties (ABMS) and endorsed by the American Board of Internal Medicine (ABIM). Name Employment Representation Consultant Speakers Bureau Ownership/Partnership/Principal Personal Research Institutional/Organizational or Other Financial Benefit Expert Witness Richard Kovacs Krannert Institute of Cardiology--Professor, Clinical Medicine Official Reviewer, ACC Board of Trustees None None None None None None Dhanunjaya Lakkireddy Kansas University Cardiovascular Research Institute Official Reviewer, ACC Board of Governors None None None None None None Howard Weitz Thomas Jefferson University Hospital--Director, Division of Cardiology; Sidney Kimmel Medical College at Thomas Jefferson University--Professor of Medicine Official Reviewer, Competency Management Committee Lead Reviewer None None None None None None Alex Auseon The Ohio State University Wexner Medical Center Content Reviewer, Academic Cardiology Section Leadership Council None None None None None None John Canty University at Buffalo Clinical and Translational Research Center--Albert and Elizabeth Rekate Professor and Chief Content Reviewer, Academic Cardiology Section Leadership Council None None None None None None Larry Jacobs Lehigh Valley Health Network, Division of Cardiology; University of South Florida--Professor, Cardiology Content Reviewer, Cardiology Training and Workforce Committee None None None None None None Andrew Kates Washington University School of Medicine Content Reviewer, Academic Cardiology Section Leadership Council None None None None None None Kiran Musunuru Brigham and Women's Hospital, Harvard University Organizational Reviewer, AHA None None None None None None Table 1 Core Competency Components and Curricular Milestones for Training in Cardiovascular Research and Scholarly Activity Add = additional months beyond the 3-year cardiovascular fellowship; DNA = deoxyribonucleic acid; RNA = ribonucleic acid.
On my country and the world Gorbachev, Mikhail; Taubman, William; Shriver, George ...
2019, 20191224, 2019-12-24
eBook
Here is the whole sweep of the Soviet experiment and experience as told by its last steward. Drawing on his own experience, rich archival material, and a keen sense of history and politics, Mikhail ...Gorbachev speaks his mind on a range of subjects concerning Russia's past, present, and future place in the world. Here is Gorbachev on the October Revolution, Gorbachev on the Cold War, and Gorbachev on key figures such as Lenin, Stalin, and Yeltsin. The book begins with a look back at 1917. While noting that tsarist Russia was not as backward as it is often portrayed, Gorbachev argues that the Bolshevik Revolution was inevitable and that it did much to modernize Russia. He strongly argues that the Soviet Union had a positive influence on social policy in the West, while maintaining that the development of socialism was cut short by Stalinist totalitarianism. In the next section, Gorbachev considers the fall of the USSR. What were the goals of perestroika? How did such a vast superpower disintegrate so quickly? From the awakening of ethnic tensions, to the inability of democrats to unite, to his own attempts to reform but preserve the union, Gorbachev retraces those fateful days and explains the origins of Russia's present crises. But Gorbachev does not just train his critical eye on the past. He lays out a blueprint for where Russia needs to go in the twenty-first century, suggesting ways to strengthen the federation and achieve meaningful economic and political reforms. In the final section of the book, Gorbachev examines the "new thinking" in foreign policy that helped to end the Cold War and shows how such approaches could help resolve a range of crises, including NATO expansion, the role of the UN, the fate of nuclear weapons, and environmental problems.On My Country and the World reveals the unique vision of a man who was a powerful actor on the world stage and remains a keen observer of Russia's experience in the twentieth century. This anniversary edition features a new foreword by William Taubman, award-winning biographer of Khrushchev and Gorbachev.
PDF
