Describing results of 4000 hours of multi environment model verification test Final report

Investigating categorization and formulation of stress and strength factors for semiconductor diodes to provide improved failure rate prediction from mathematical model

How Cities Can Combat Illegal Guns and Gun Violence

Though gun violence peaked in American cities in the early 1990s, firearms are still used in more than 30 homicides per day in the U.S.One major challenge is how to stanch the flow of guns to criminals. Researchers from the School's Center for Gun Policy and Research have recently zeroed in on illegal sales by licensed dealers (the dominant means of diverting guns into illegal markets). These sales include unrecorded, "off the books" transactions and "straw purchases" in which a person unable to pass a federal background check relies on another individual for the purchase.Daniel Webster, MPH, ScD '91, Center co-director, wants to increase the accountability of gun dealers. This report outlines how to reduce illegal gun trafficking, reduce illegal gun carrying, and use technology to prevent gun violence

Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation

Applying a magnetic-field gradient to a trapped ion allows long-wavelength radiation to produce a mechanical force on the ion's motion when internal transitions are driven. We demonstrate such a coupling using a single trapped Yb+171 ion and use it to produce entanglement between the spin and motional state, an essential step toward using such a field gradient to implement multiqubit operations

The genetic diversity and geographical separation study of Oncomelania hupensis populations in mainland China using microsatellite loci

© 2016 Guan et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. The attached file is the published version of the article.NHM Repositor

Updated Evidence and Policy Developments on Reducing Gun Violence in America

This digital update to Reducing Gun Violence in America presents new evidence and developments in the effort to address the staggering toll of gun violence in the United States.In 2013—in the wake of the tragic shooting at Sandy Hook Elementary School—Johns Hopkins University Press published Reducing Gun Violence in America, a collection of essays written by the world’s leading experts on gun violence. Updated Evidence and Policy Developments on Reducing Gun Violence in America follows up on the state of American gun violence by analyzing new data, research, and policy developments one year after Sandy Hook. Over the course of ten substantive chapter addendums, contributors bring readers up-to-date on such varied topics as mental illness, domestic violence, background checks, illegal gun sales, and personalized guns. They describe the recent policy measures that have been enacted and suggest additional approaches that may help stem the violence. An essential companion to Reducing Gun Violence in America, the reliable, empirical research and legal analysis in this e-book will help lawmakers, opinion leaders, and concerned citizens identify policy changes to address gun violence, which takes an average of more than 80 lives every day in the United States

Simple manipulation of a microwave dressed-state ion qubit

Many schemes for implementing quantum information processing require that the atomic states used have a non-zero magnetic moment, however such magnetically sensitive states of an atom are vulnerable to decoherence due to fluctuating magnetic fields. Dressing an atom with an external field is a powerful method of reducing such decoherence [N. Timoney et al., Nature 476, 185], even if the states being dressed are strongly coupled to the environment. We introduce an experimentally simpler method of manipulating such a dressed-state qubit, which allows the implementation of general rotations of the qubit, and demonstrate this method using a trapped ytterbium ion

Ground-state cooling of a trapped ion Using long-wavelength radiation

We demonstrate ground-state cooling of a trapped ion using radio-frequency (rf) radiation. This is a powerful tool for the implementation of quantum operations, where rf or microwave radiation instead of lasers is used for motional quantum state engineering. We measure a mean phonon number of n¯=0.13(4) after sideband cooling, corresponding to a ground-state occupation probability of 88(7)%. After preparing in the vibrational ground state, we demonstrate motional state engineering by driving Rabi oscillations between the |n=0⟩ and |n=1⟩ Fock states. We also use the ability to ground-state cool to accurately measure the motional heating rate and report a reduction by almost 2 orders of magnitude compared with our previously measured result, which we attribute to carefully eliminating sources of electrical noise in the system