Last year a second-generation SSRL-type thermionic cathode rf gun was installed in the Advanced Photon Source (APS) linac. This gun (referred to as “gun2”) has been successfully commissioned and now serves as the main injector for the APS linac, essentially replacing the Koontz-type DC gun. To help ensure injector availability, particularly with the advent of top-up mode operation at the APS, a...

We investigate the relationships between gun ownership and murders, reported rapes, and robberies. We proxy gun ownership by the number of subscriptions to the gun magazine Handguns Magazine and accommodate the count nature of our data by analyzing them with a multivariate Poisson-lognormal model. For most of our analyses, we find that the correlation between today’s number of guns and future c...

BACKGROUND Among developed nations, the United States has the highest rate of civilian gun ownership, and the highest homicide rate. We examine whether the United States is merely an exception, or if a relationship between gun availability and homicide exists across all developed nations. METHODS Homicide rates for the early 1990s come from 26 of 27 of the highly industrialized or high-income...

ment in parent supervision. Other postmarketing surveillance requirements include the monitoring ofthe durability of the product and determining whether the countermeasure has been applied as intended (for example bicycle helmet fit).5 What's needed is a systematic approach to injury countermeasure postmarketing surveillance. Only then will the full value of the countermeasure for the world com...

A new finite element gun code is under development. In an effort to improve the gun code model, a concept[1] has been proposed recently that treats fields in a typical way, but includes a unique, formal approach to both particle tracking and source allocation. Being a new approach, there are concerns about the speed, accuracy, and appropriateness of this proposal for the electrostatic, steady-s...

Four assumptions frequently arise in the aftermath of mass shootings in the United States: (1) that mental illness causes gun violence, (2) that psychiatric diagnosis can predict gun crime, (3) that shootings represent the deranged acts of mentally ill loners, and (4) that gun control "won't prevent" another Newtown (Connecticut school mass shooting). Each of these statements is certainly true ...

In this study various species of captive marine fish and one species of squid were exposed to the noise from a single air gun. Six trials were conducted off the coast of Western Australia with each trial using a different noise exposure regime. Noise levels received by the animals ranged between 120 and 184 dB re 1 μPa(2).s (SEL). Behavioural observations of the fish and squid were made before,...

The superconducting RF photoinjector (SRF gun) operating with a 31⁄2-cell niobium cavity and Cs2Te photocathodes is installed at the ELBE radiation center. Since 2012 a new UV driver laser system developed by MBI has been installed for the SRF gun. It delivers CW or burst mode pulses with 13 MHz repetition rate or with reduced rates of 500, 200, and 100 kHz at an average UV laser power of about...

For the last several years, reported violent crime has been decreasing across the United States. New York City has been notable concerning this trend. Since 1991, while the number of violent crimes reported within the City has decreased significantly, violent crimes involving firearms, especially handguns, have decreased by an even greater percentage. But why? Some point to the New York City Po...