| 1. |
- Ablikim, M., et al.
(författare)
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Measurements of (XcJ)-> K+K-K+K- decays
- 2006
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 642:3, s. 197-202
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Tidskriftsartikel (refereegranskat)abstract
- Using 14M psi(2S) events taken with the BESII detector, chi(cJ) -> 2(K+K-) decays are studied. For the four-kaon final state, the branching fractions are B(chi(c0,1,2) ->.2(K+K-)) = (3.48 +/- 0.23 +/- 0.47) x 10(-3), (0.70 +/- 0.13 +/- 0.10) x 10(-3), and (2.17 +/- 0.20 +/- 0.31) x 10(-3). For the phi K+K- final state, the branching fractions, which are measured for the first time, are B(chi(c0,1,2) -> phi K+K-) = (1.03 +/- 0.22 +/- 0.15) x 10(-3), (0.46 +/- 0.16 +/- 0.06) x 10(-3), and (1.67 +/- 0.26 +/- 0.24) x 10(-4). For the phi phi final state, B(chi(c0,2) -> phi phi) = (0.94 +/- 0.21 +/- 0.13) x 10(-3) and (1.70 +/- 0.30 +/- 0.25) x 10(-3).
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| 2. |
- Schael, S, et al.
(författare)
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Precision electroweak measurements on the Z resonance
- 2006
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Ingår i: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 427:5-6, s. 257-454
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Forskningsöversikt (refereegranskat)abstract
- We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
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| 3. |
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| 4. |
- Xu, X., et al.
(författare)
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Effects of Ischemia-Reperfusion Injury on Apolipoprotein M Expression in the Liver
- 2006
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Ingår i: Transplantation Proceedings. - : Elsevier BV. - 0041-1345. ; 38:9, s. 2769-2773
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Tidskriftsartikel (refereegranskat)abstract
- The present study investigated the expression pattern of apolipoprotein M (apoM) mRNA in a rat model of hepatic ischemia-reperfusion injury (IRI). Animals were ischemic for I hour followed by various reperfusion times. As expected, serum alanine aminotransferase levels were significantly increased under IRI, which indicated the severity of liver injury. Hepatic mRNA levels of HSP70, which is the most common characterized protein within the family of heat-shock proteins (HSP), were significantly increased after 0.5 to 3 hours of IRI. Plasma Greactive protein, high-density lipoprotein-cholesterol, and lipoprotein (a) levels were significantly increased after 1-hour ischemia followed by 0.5 to 3 hours of reperfusion. Interestingly, similar to HSP70, apoM mRNA levels in the liver were gradually increased after 0.5 to 3 hours of IRI, whereas it returned to a lower level after 6 or 24 hours of IRI, which indicated that hepatic apoM expression was significantly influenced by the acute phase of IRI. However, plasma apoM levels were not increased in parallel, even slightly decreasing after 0.5 or I hour of IRI. We concluded that apoM mRNA expression pattern, like HSP70, in the liver showed rapid, significant changes during hepatic local IRI.
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| 5. |
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| 6. |
- Shen, G. X., et al.
(författare)
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The chloroplast protease subunit ClpP4 is a substrate of the E3 ligase AtCHIP and plays an important role in chloroplast function
- 2007
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Ingår i: Plant Journal. - 0960-7412. ; 49:2, s. 228-237
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Tidskriftsartikel (refereegranskat)abstract
- Animal CHIP proteins are chaperone-dependent E3 ubiquitin ligases that physically interact with Hsp70, Hsp90 and proteasome, promoting degradation of a selective group of non-native or damaged proteins in animal cells. The plant CHIP-like protein, AtCHIP, also plays important roles in protein turnover metabolism. AtCHIP interacts with a proteolytic subunit, ClpP4, of the chloroplast Clp protease in vivo, and ubiquitylates ClpP4 in vitro. The steady-state level of ClpP4 is reduced in AtCHIP-overexpressing plants under high-intensity light conditions, suggesting that AtCHIP targets ClpP4 for degradation and thereby regulates the Clp proteolytic activity in chloroplasts under certain stress conditions. Overexpression of ClpP4 in Arabidopsis leads to chlorotic phenotypes in transgenic plants, and chloroplast structures in the chlorotic tissues of ClpP4-overexpressing plants are abnormal and largely devoid of thylakoid membranes, suggesting that ClpP4 plays a critical role in chloroplast structure and function. As AtCHIP is a cytosolic protein that has been shown to play an important role in regulating an essential chloroplast protease, this research provides new insights into the regulatory networks controlling protein turnover catabolism in chloroplasts.
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| 7. |
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| 8. |
- Yang, B., et al.
(författare)
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Fabrication and Characterization of Small Optical Ridge Waveguides Based on SU-8 Polymer
- 2009
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 27:18, s. 4091-4096
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Tidskriftsartikel (refereegranskat)abstract
- Small SU-8 ridge optical waveguides with an air cladding and a SiO2 buffer on Si substrate have been realized by using a direct ultraviolet (UV) photolithography technology. The propagation loss measured by the cut-back method is about 0.1 dB/mm (@1550 nm) when the core width is 2.8 mu m. The bending losses of the present SU-8 optical ridge waveguides are also characterized. The measured results show that the bending loss decreases exponentially as the bending radius increases and the total loss can be reduced effectively by introducing an appropriate offset between two connected sections with different curvatures. A small bending radius (as small as 75 mu m) is still allowed for the requirement of a small bending loss (< 0.1 dB) when an offset of 0.1 mu m is introduced. Finally, by using this kind of waveguide, a small 1 x 2 Y-branch power splitter is fabricated and characterized.
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| 9. |
- Zha, Chaolin, et al.
(författare)
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Dependence of Ordering Kinetics of FePt Thin Films on Different Substrates
- 2008
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Ingår i: IEEE transactions on magnetics. - 0018-9464 .- 1941-0069. ; 44:11, s. 3539-3542
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Tidskriftsartikel (refereegranskat)abstract
- FePt thin films are deposited on SMO3, MgO, and a 2 nm-FeOx underlayer on an Si substrate at room temperature and then annealed at elevated temperatures. Studies of the L1(0) ordering process in each case show that the ordering temperature for the FePt film on the nonepitaxial Si/FeOx substrate is similar to 150 degrees C lower than the epitaxial FePt films deposited on MgO and SrTiO3 substrates. We argue that internal stresses arising from lattice defects and a recrystallizing process as well as thermal strain from differences in thermal expansion between substrate and film are responsible for the differences in ordering kinetics from the A1 to L1(0) phase of FePt on the various substrates.
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