Armed Services Chair Remains Deeply Skeptical of BRAC Request

first_imgMac Thornberry (R-Texas), chairman of the House Armed Services Committee, reiterated his opposition to the Pentagon’s request to conduct a BRAC round in 2017, in a fact sheet accompanying the chairman’s mark of the fiscal 2016 defense authorization bill.The document acknowledges that DOD has expressed concerns that excess basing capacity is a financial drag on the department, as well as that its most recent capacity analysis is more than a decade old and does not reflect the probable future force posture.The fact sheet indicated, though, that Thornberry would remain extremely reluctant to approve a new round until the military’s roles and missions are better defined.“Chairman Thornberry is concerned that once an asset is lost through the BRAC process, it can never be regained, or is prohibitively expensive to replace. For that reason, he is deeply skeptical that BRAC is in the country’s national security interest,” it states.The fact sheet notes that the measure directs DOD to perform a new capacity analysis that “reflects the current threat profile and makes conservative assumptions about future end strength.”The Readiness Subcommittee’s portion of the defense policy bill includes a provision rejecting the administration’s BRAC request. The fact sheet can be found on the committee website. Dan Cohen AUTHORlast_img read more

New atomic magnetometer doesnt need to be shielded from Earths magnetic field

first_img(Phys.org) —Researchers from Princeton University in the U.S. together with colleagues from Zhejiang University of Science and Technology in China have developed a new kind of atomic magnetometer that is just as sensitive as others of its kind but doesn’t need to be shielded from the Earth’s magnetic field. The team reports on their new device in the journal Physical Review Letters. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Explore further Journal information: Physical Review Letters Devices that can measure magnetic fields—magnetometers—are very useful in a wide variety of scientific applications. In recent years, such devices have been made more sensitive by using superconducting materials but they have the drawback of needing to be cryogenically cooled. Another approach has been to use atomic magnetometers—they don’t have to be super-cooled, but they do need to have shielding put in place to prevent Earth’s magnetic field from interfering with their readings. They work by using a pump laser to polarize the spin states of atoms inside the device. A probe laser is then used to read the spin precession once the device is ready to read a specific magnetic field—it’s all based on the Zeeman Effect that is induced by an external magnetic field.The new atomic magnetometer the group developed works essentially the same way as others of its kind, with two notable exceptions. The first is that the team uses a multi-pass cell—the probe laser makes many passes while reading the spin of the atoms in the device—typically rubidium vapor—this enhances the signal. The second difference is the team uses a technique to allow the polarizing to take place very quickly (within 1ms of laser pumping)—before relaxation of the spin states occurs. Doing so has the added benefit of helping to eliminate noise in the system allowing for more precise readings. The end result is an atomic magnetometer that is able to measure magnetism that is one hundred billion times smaller than the Earth’s field, without the need for shielding.Such a magnetometer is expected to be useful for such applications as measuring biological fields, geological instrumentation, experimental physics and even in land mine detection. The team that developed the new device isn’t resting on its laurels, however, they are currently looking at ways to make the device smaller and more portable. Record measurement of extremely small magnetic fieldscenter_img More information: Subfemtotesla Scalar Atomic Magnetometry Using Multipass Cells, Phys. Rev. Lett. 110, 160802 (2013) DOI: 10.1103/PhysRevLett.110.160802AbstractScalar atomic magnetometers have many attractive features but their sensitivity has been relatively poor. We describe a Rb scalar gradiometer using two multipass optical cells. We use a pump-probe measurement scheme to suppress spin-exchange relaxation and two probe pulses to find the spin precession zero crossing times with a resolution of 1 psec. We realize a magnetic field sensitivity of 0.54  fT/Hz1/2, which improves by an order of magnitude the best scalar magnetometer sensitivity and exceeds, for example, the quantum limit set by the spin-exchange collisions for a scalar magnetometer with the same measurement volume operating in a continuous regime. Citation: New atomic magnetometer doesn’t need to be shielded from Earth’s magnetic field (2013, April 26) retrieved 18 August 2019 from https://phys.org/news/2013-04-atomic-magnetometer-doesnt-shielded-earth.html © 2013 Phys.org Credit: J. Shi/Princeton University/PRLlast_img read more

Harvard professor to speak about diversity

first_img About admin ShareCONTACT: Ellen ChangPHONE:(713) 348-6777EMAIL: [email protected] PROFESSOR TOSPEAK ABOUT DIVERSITYWell-known HarvardUniversity professor Cornel West will discuss his views on diversity in themillennium at a lecture on April 16 at Rice University. West will speak about a“Dialog On Diversity.” The lecture begins at 7 p.m. in the Grand Hall in RiceMemorial Center. West will be available at a 6 p.m. reception and at the booksigning following his speech.West is the author of 13books, including “Race Matters,” a best seller that received attention from Timeand Newsweek, which each featured a profile of him. His other works include“Beyond Eurocentrism and Multiculturism,” “Breaking Bread,” “Keeping Faith,”“Jews and Blacks: Let the Healing Begin” and “Restoring Hope: Conversations onthe Future of Black America.” He also wrote “The War Against Parents” withSylvia Ann Hewlett, with whom he co-chairs the National Parenting Association’sTalk Force on Parent Empowerment. His most recent publication, “The Cornel WestReader,” traces the development of his career as an academic, intellectual andactivist.He is the AlphonseFletcher Jr. Professor at Harvard, where he was promoted recently to universityprofessor, a title held by only 14 of the school’s 2,200 faculty members. Heteaches Afro-American studies and philosophy of religion.West’s work which isinfluenced by traditions as diverse as the Baptist Church, Americantranscendentalism and literature, the Black Panthers and European philosophy,seeks to revive the best of liberalism, populism and democratic socialism. Awell-respected and popular lecturer, West’s speaking style – formed by his rootsin the Baptist Church – provides a blend of drama, knowledge andinspiration.West attended publicschools in Sacramento and then went to Harvard, where he graduated magna cumlaude in three years in 1973. He went on to Princeton, earning his master’sdegree in 1975 and his doctorate in 1980.The lecture is hosted bythe Black Graduate Student Association, the Jones School and the Rice UniversityBlack Student Coalition, which consists of members of the Black StudentAssociation, the Black Graduate Student Association and the Rice chapter of theNational Society of Black Engineers. The group organized West’s lecture in aneffort to initiate a dialog on diversity in the new millennium.The lecturesets the stage for the Enhancing Black Leadership Conference, which begins onApril 27 and is hosted by the National Black MBA Association, the Jesse H. JonesGraduate School of Management and Rice University Executive Education. For moreinformation on the conference, call (713) 348-6060. AddThis last_img read more