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RISS 인기검색어
- 검색키워드
- 저자 : Amy A. Lopez (검색결과 2 건)
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- 유료
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Test of Special Relativity Using a Fiber Network of Optical Clocks
Delva, P.,Lodewyck, J.,Bilicki, S.,Bookjans, E.,Vallet, G.,Le Targat, R.,Pottie, P.-E.,Guerlin, C.,Meynadier, F.,Le Poncin-Lafitte, C.,Lopez, O.,Amy-Klein, A.,Lee, W.-K.,Quintin, N.,Lisdat, C.,Al-Maso American Physical Society 2017 Physical Review Letters Vol.118 No.22
<P>Phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. By searching for a daily variation of the frequency difference between four strontium optical lattice clocks in different locations throughout Europe connected by such links, we improve upon previous tests of time dilation predicted by special relativity. We obtain a constraint on the Robertson-Mansouri-Sexl parameter |alpha| <= 1.1 x 10(-8), quantifying a violation of time dilation, thus improving by a factor of around 2 the best known constraint obtained with Ives-Stilwell type experiments, and by 2 orders of magnitude the best constraint obtained by comparing atomic clocks. This work is the first of a new generation of tests of fundamental physics using optical clocks and fiber links. As clocks improve, and as fiber links are routinely operated, we expect that the tests initiated in this Letter will improve by orders of magnitude in the near future.</P>
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Erick S. Mendoza,Amy A. Lopez,Valerie Ann U. Valdez,Leilani B. Mercado-Asis 대한내분비학회 2016 Endocrinology and metabolism Vol.31 No.3
Background: Osteoporosis in men is markedly underdiagnosed and undertreated despite higher morbidity and mortality associatedwith fractures. This study aimed to characterize adult Filipino men with osteopenia, osteoporosis and prevalent fractures. Methods: A cross-sectional study of 184 Filipino men ≥50 years screened for bone mineral density was performed. Age, weight,body mass index (BMI), Osteoporosis Self-Assessment Tool for Asians (OSTA) score, smoking status, family history of fracture,diabetes mellitus, physical inactivity, and T-score were considered. Results: Of the 184 patients, 40.2% and 29.9% have osteopenia and osteoporosis. Sixteen (21.6%) and 18 (32.1%) osteopenicand osteoporotic men have fragility hip, spine, or forearm fractures. Men aged 50 to 69 years have the same risk of osteoporosisand fractures as those ≥70 years. While hip fractures are higher in osteoporotic men, vertebral fractures are increased in both osteopenicand osteoporotic men. Mere osteopenia predicts the presence of prevalent fractures. A high risk OSTA score can predictfracture. A BMI <21 kg/m2 (P<0.05) and current smoking are associated with osteoporosis. Conclusion: A significant fraction of Filipino men with osteopenia and osteoporosis have prevalent fractures. Our data suggestthat fractures occur in men <70 years even before osteoporosis sets in. Low BMI, high OSTA score, and smoking are significantrisk factors of osteoporosis.
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