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  • Articles  (84)
  • 2015-2019  (51)
  • 2010-2014  (33)
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  • 1
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    Raman scattering investigation of C-doped a-SiO 2 after high energy heavy ion irradiations (2011)
    Institute of Physics (IOP)
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    Publication Date: 2011-09-17
    Description: Thermally grown amorphous SiO 2 films were implanted at room temperature with 100 keV C-ions to 5.0×10 17 or 1.2×10 18 ions/cm 2 . These samples were irradiated at room temperature with 853 MeV Pb-ions to 5.0×10 11 , 1.0×10 12 , 5.0×10 12 ions/cm 2 , or with 308 MeV Xe-ions to 1.0×10 12 , 1.0×10 13 , 1.0×10 14 ions/cm 2 , respectively. Then the samples were investigated using micro-Raman spectroscopy. From the obtained Raman spectra, we deduced that Si—C bonds and sp 2 carbon sites were created and nano-inclusions may also be produced in the heavy ion irradiated C-doped SiO 2 . Furthermore, some results show that Pb ion irradiations could produce larger size inclusions than Xe ions and the inclusion size decreased with increasing the irradiation fluence. The possible modification process of C-doped a-SiO 2 under swift heavy ion irra...
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Cooling mechanical resonators to the quantum ground state from room temperature (2015)
    American Physical Society (APS)
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    Publication Date: 2015-01-16
    Description: Author(s): Yong-Chun Liu, Rui-Shan Liu, Chun-Hua Dong, Yan Li, Qihuang Gong, and Yun-Feng Xiao Ground-state cooling of mesoscopic mechanical resonators is a fundamental requirement for testing of quantum theory and for implementation of quantum information. We analyze the cavity optomechanical cooling limits in the intermediate coupling regime, where the light-enhanced optomechanical coupling... [Phys. Rev. A 91, 013824] Published Thu Jan 15, 2015
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Genetic Variability and Phylogenetic Analysis of Han Population from Guanzhong Region of China based on 21 non-CODIS STR Loci (2015)
    Nature Publishing Group (NPG)
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    Publication Date: 2015-03-10
    Description: In the present study, we presented the population genetic data and their forensic parameters of 21 non-CODIS autosomal STR loci in Chinese Guanzhong Han population. A total of 166 alleles were observed with corresponding allelic frequencies ranging from 0.0018 to 0.5564. No STR locus was observed to deviate from the Hardy-Weinberg equilibrium and linkage disequilibriums after applying Bonferroni correction. The cumulative power of discrimination and probability of exclusion of all the 21 STR loci were 0.99999999999999999993814 and 0.999998184, respectively. The results of genetic distances, phylogenetic trees and principal component analysis revealed that the Guanzhong Han population had a closer relationship with Ningxia Han, Tujia and Bai groups than other populations tested. In summary, these 21 STR loci showed a high level of genetic polymorphisms for the Guanzhong Han population and could be used for forensic applications and the studies of population genetics. Scientific Reports 5 doi: 10.1038/srep08872
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Nature Publishing Group (NPG)
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  • 4
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    Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3 (2015)
    Springer Nature
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    Publication Date: 2015-02-21
    Description: Nature Materials 14, 285 (2015). doi:10.1038/nmat4153 Authors: Jian-Feng Ge, Zhi-Long Liu, Canhua Liu, Chun-Lei Gao, Dong Qian, Qi-Kun Xue, Ying Liu & Jin-Feng Jia Recent experiments on FeSe films grown on SrTiO3 (STO) suggest that interface effects can be used as a means to reach superconducting critical temperatures (Tc) of up to 80 K (ref. ). This is nearly ten times the Tc of bulk FeSe and higher than the record value of 56 K for known bulk Fe-based superconductors. Together with recent studies of superconductivity at oxide heterostructure interfaces, these results rekindle the long-standing idea that electron pairing at interfaces between two different materials can be tailored to achieve high-temperature superconductivity. Subsequent angle-resolved photoemission spectroscopy measurements of the FeSe/STO system revealed an electronic structure distinct from bulk FeSe (refs , ), with an energy gap vanishing at around 65 K. However, ex situ electrical transport measurements have so far detected zero resistance—the key experimental signature of superconductivity—only below 30 K. Here, we report the observation of superconductivity with Tc above 100 K in the FeSe/STO system by means of in situ four-point probe electrical transport measurements. This finding confirms FeSe/STO as an ideal material for studying high-Tc superconductivity.
    Print ISSN: 1476-1122
    Electronic ISSN: 1476-4660
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 5
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    Metallic ferroelectricity induced by anisotropic unscreened Coulomb interaction in LiOsO_{3} (2015)
    American Physical Society (APS)
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    Publication Date: 2015-02-21
    Description: Author(s): H. M. Liu, Y. P. Du, Y. L. Xie, J.-M. Liu, Chun-Gang Duan, and Xiangang Wan As the first experimentally confirmed ferroelectric metal, LiOsO 3 has received extensive research attention recently. Using density-functional calculations, we perform a systematic study on the origin of the metallic ferroelectricity in LiOsO 3 . We confirm that the ferroelectric transition in this co... [Phys. Rev. B 91, 064104] Published Fri Feb 20, 2015
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Feedback regulation of IFN-α/β signaling by Axl receptor tyrosine kinase modulates HBV immunity (2015)
    Wiley-Blackwell
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    Publication Date: 2015-03-28
    Description: Hepatitis B virus (HBV) is known to cause age-dependent infection outcomes wherein most infections during young age result in chronicity. The mechanism underlying the differential outcome remains elusive. By using hydrodynamic injection of the replication-competent pAAV -HBV, we established a mouse model in which HBV persistence was generated in 4–5 w/o C57BL/6 young mice, but not in adult mice over 10 w/o. HBV-tolerant young mice expressed higher interferon (IFN)-α/β levels in hepatocytes and intrahepatic plasmacytoid DCs (pDCs) than adult mice after pAAV -HBV injection. Excessive IFN-α/β expression in young mice was associated with induction of the Axl regulatory pathway and expansion of intrahepatic Treg cells. In line with these findings, augmented IFN-β expression increased Axl expression in the liver and HBV persistence in adult mice, whereas IFN-α/β signaling blockage decreased Axl expression and HBV persistence in young mice. Accordingly, Axl overexpression decreased HBV clearance of adult mice whereas Axl silencing enhanced HBV clearance of young mice. In vitro, IFN-β priming of pDCs and Axl-overexpressing macrophages enhanced Treg-cell differentiation. These findings suggest that age-dependent HBV chronicity is attributed to IFN-β-Axl immune regulation, which is selectively induced in young mice by excessive IFN-α/β production at early stages of HBV infection. This article is protected by copyright. All rights reserved
    Print ISSN: 0014-2980
    Electronic ISSN: 1521-4141
    Topics: Medicine
    Published by Wiley-Blackwell
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  • 7
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    A simple and wide-range refractive index measuring approach by using a sub-micron grating (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-04-17
    Description: This paper presents the design and simulation results of a high-precision low-cost refractometer that demonstrates the main advantage of a wide measurement range (1 ≤ n ≤ 2). The proposed design is based on the diffractive properties of sub-micron gratings and Snell's Law. The precision and uncertainty factors of the proposed system were tested and analyzed, revealing that the proposed refractometer demonstrates a wide measurement range with sensitivity of 10 −4 .
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    A positioning-tolerant wireless charging system for roadway-powered electric vehicles (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-26
    Description: This paper proposes a positioning-tolerant wireless power transfer technique to compensate the impact of misalignment on the power transmission performance, which is used to implement the wireless charging functionality in a free-positioning manner, thus significantly improving the practicality for roadway-powered electric vehicles (EVs). The key of the proposed wireless power transfer technique is to adopt the gapless alternate-winding topology for the power supply unit to produce an evenly distributed electromagnetic field and the vertical-and-horizontal coil design for the pickup unit to enhance the capability of acquiring energy. Hence, the power transmission can be effectively improved in spite of an offset between the centers of the primary and secondary coils. In this paper, both the computational simulation and experimentation are carried out to verify the feasibility of the proposed positioning-tolerant wireless charging system for roadway-powered EVs.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    Incidence of skin and soft tissue infections in ambulatory and inpatient settings, 2005–2010 (2015)
    BioMed Central
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    Publication Date: 2015-08-22
    Description: Background: The emergence of community-associated methicillin-resistant S. aureus was associated with dramatically increased skin and soft tissue infection (SSTI) incidence in the first few years of the 21 st century in the U.S. However, subsequent trends are poorly understood. Methods: We examined ambulatory and inpatient data of over 48 million persons years aged 0–64 years from the HealthCore Integrated Research Database (HIRD) between 2005 and 2010. Data were extracted from medical, pharmacy, and eligibility databases. We quantified SSTI incidence, type, and complications and comparative incidence trends for urinary tract infections (UTIs) and pneumonia. Results: A total of 2,301,803 SSTIs were identified. Most SSTIs (95 %) were treated in the ambulatory setting and most (60 %) were categorized as abscesses or cellulitis. During the study period, SSTI incidence remained relatively stable from 47.9 (95 % CI: 47.8–48.1) cases/1,000 PY in 2005 to 48.5 cases/1,000 PY (95 % CI: 48.3–48.6) in 2010). Persons aged 45–64 years had the highest incidence of both ambulatory-treated and inpatient-treated SSTIs (51.2 (95 % CI: 51.1–51.3) and 3.87 (95 % CI: 3.84–3.90) cases/1,000 PY, respectively). SSTI complications such as myositis, gangrene, and sepsis occurred in 0.93 % (95 % CI: 0.92–0.94 %) and 16.92 % (95 % CI: 16.87–16.97 %) of ambulatory-treated and inpatient-treated patients, respectively. SSTI incidence was approximately twice that of UTIs and tenfold of that of pneumonia. Conclusions: Among our large, diverse population of persons less than 65 years, SSTI incidence 2005 through 2010 has remained relatively constant at approximately 4.8 SSTIs per 100 person years, suggesting that previously observed increases in SSTI incidence remain sustained.
    Electronic ISSN: 1471-2334
    Topics: Medicine
    Published by BioMed Central
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  • 10
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    Reactive Adsorption Desulfurization of Hydrotreated Diesel over a Ni/ZnO–Al2O3–SiO2 Adsorbent (2015)
    American Chemical Society (ACS)
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    Publication Date: 2015-08-29
    Description: Energy & Fuels DOI: 10.1021/acs.energyfuels.5b00669
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
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