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Measurement of vector boson plusD*(2010)+meson production inp¯pcollisions ats=1.96 TeV
Aaltonen, T.,Amerio, S.,Amidei, D.,Anastassov, A.,Annovi, A.,Antos, J.,Apollinari, G.,Appel, J. A.,Arisawa, T.,Artikov, A.,Asaadi, J.,Ashmanskas, W.,Auerbach, B.,Aurisano, A.,Azfar, F.,Badgett, W.,Bae American Physical Society 2016 Physical Review D Vol.93 No.5
<P>A measurement of vector boson (V) production in conjunction with a D*(2010)(+) meson is presented. Using a data sample corresponding to 9.7 fb(-1) of proton-antiproton collisions at center-of-mass energy root s = 1.96 TeV produced by the Fermilab Tevatron, we reconstruct V + D*+ samples with the CDF II detector. The D*+ is fully reconstructed in the D*(2010)(+) -> D-0 (-> K-pi(+))pi(+) decay mode. This technique is sensitive to the associated production of vector boson plus charm or bottom mesons. We measure the ratio of production cross sections sigma(W + D*) = sigma(W) = [1.75 +/- 0.13(stat) +/- 0.09(stat)]% and sigma(Z + D*)/sigma(Z) = [1.5 +/- 0.4(stat) +/- 0.2(stat)]% and perform a differential measurement of d sigma(W + D*)/dp(T)(D*). Event properties are utilized to determine the fraction of V + D*(2010)(+) events originating from different production processes. The results are in agreement with the predictions obtained with the PYTHIA program, limiting possible contribution from non-standard-model physics processes.</P>
PHOTOMETRIC PROPERTIES OF FOUR NEW VARIABLE STARS IN THE VICINITY OF BR CAM
KIM S.-L.,LEE C.-D.,LEE J. W.,LEE J. A.,KANG Y.B.,KOO J.-R.,VAUCLAIR G. The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.4
We present photometric results for four new variable stars discovered in the vicinity of the ZZ Ceti-type pulsating white dwarf BR Cam. Observations were performed on 5 nights in November 2003 using the 1.8m telescope at Bohyunsan Optical Astronomy Observatory with no filter, on 3 nights in December 2003 using the 0.61m telescope at Sobaeksan Optical Astronomy Observatory with V, I filters, and on 3 nights in October 2004 using the 1.0m telescope at Mt. Lemmon Optical Astronomy Observatory with V, I filters. We estimated their periods from the phase-match technique for one eclipsing binary and the multiple frequency analysis for three pulsating stars. By considering the light curve shape, period and amplitude difference between two passbands, we classified the objects by their variability types as follows: V1 (USNO-A2.0 1425-05691757) is a W UMa-type eclipsing binary with an orbital period of $0^d.4641$; V2 (USNO-A2.0 1425-05703335) is a multi-periodic $\delta$ Set-type pulsating star with a dominant period of $0^d.0649$; V3 (USNO-A2.0 1425-05699659) is also a $\delta$ Set-type pulsating star with a period of $0^d.1408$; and V 4 (USNO-A2.0 1425-05707705) is a RR Lyr-type pulsating star with a period of $0^d.2643$.
Aaltonen, T.,Amerio, S.,Amidei, D.,Anastassov, A.,Annovi, A.,Antos, J.,Apollinari, G.,Appel, J. A.,Arisawa, T.,Artikov, A.,Asaadi, J.,Ashmanskas, W.,Auerbach, B.,Aurisano, A.,Azfar, F.,Badgett, W.,Bae American Physical Society 2016 Physical Review D Vol.93 No.11
<P>At the Fermilab Tevatron proton-antiproton (p (p) over bar) collider, Drell-Yan lepton pairs are produced in the process p (p) over bar -> e(+)e(-) + X through an intermediate gamma*/Z boson. The forward-backward asymmetry in the polar-angle distribution of the e(-) as a function of the e(+)e(-)-pair mass is used to obtain sin(2) theta(lept)(eff), the effective leptonic determination of the electroweak-mixing parameter sin(2) theta(W). The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.4 fb(-1) of integrated luminosity from p (p) over bar collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin(2) theta(lept)(eff) is found to be 0.23248 +/- 0.00053. The combination with the previous CDF measurement based on mu(+)mu(-) pairs yields sin(2) theta(lept)(eff) = 0.23221 +/- 0.00046. This result, when interpreted within the specified context of the standard model assuming sin(2) theta(W) = 1 - M-W(2)/M-Z(2) and that the W- and Z-boson masses are on-shell, yields sin(2) theta(W) = 0.22400 +/- 0.00045, or equivalently a W-boson mass of 80.328 +/- 0.024 GeV/c(2).</P>
Aaltonen, T.,Amerio, S.,Amidei, D.,Anastassov, A.,Annovi, A.,Antos, J.,Apollinari, G.,Appel, J. A.,Arisawa, T.,Artikov, A.,Asaadi, J.,Ashmanskas, W.,Auerbach, B.,Aurisano, A.,Azfar, F.,Badgett, W.,Bae American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.7
<P>Drell-Yan lepton pairs are produced in the process p (p) over bar -> mu(+)mu(-) + X through an intermediate gamma*/Zboson. The forward-backward asymmetry in the polar-angle distribution of the mu(-) as a function of the invariant mass of the mu(+)mu(-) pair is used to obtain the effective leptonic determination sin(2)theta(lept)(eff) of the electroweakmixing parameter sin(2)theta w, from which the value of sin(2)theta w is derived assuming the standard model. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.2 fb(-1) of integrated luminosity from p (p) over bar collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin(2)theta(lept)(eff) is found to be 0.2315 +/- 0.0010, where statistical and systematic uncertainties are combined in quadrature. When interpreted within the context of the standard model using the on-shell renormalization scheme, where sin(2)theta w = 1 - M-W(2)/M-Z(2), the measurement yields sin(2)theta w = 0.2233 +/- 0.0009, or equivalently a W-boson mass of 80.365 +/- 0.047 GeV/c(2). The value of the W-boson mass is in agreement with previous determinations in electron- positron collisions and at the Tevatron collider.</P>
Aaltonen, T.,Amerio, S.,Amidei, D.,Anastassov, A.,Annovi, A.,Antos, J.,Apollinari, G.,Appel, J. A.,Arisawa, T.,Artikov, A.,Asaadi, J.,Ashmanskas, W.,Auerbach, B.,Aurisano, A.,Azfar, F.,Badgett, W.,Bae American Physical Society 2017 Physical Review D Vol.95 No.9
<P>We report on a measurement of the D+ -meson production cross section as a function of transverse momentum (p(T)) in proton-antiproton (p (p) over bar) collisions at 1.96 TeV center-of-mass energy, using the full data set collected by the Collider Detector at Fermilab in Tevatron Run II and corresponding to 10 fb(-1) of integrated luminosity. We use D-broken vertical bar -> K- pi(broken vertical bar) pi(broken vertical bar) decays fully reconstructed in the central rapidity region broken vertical bar y broken vertical bar < 1 with transverse momentum down to 1.5 GeV/c, a range previously unexplored in p<(p)over bar> collisions. Inelastic p (p) over bar -scattering events are selected online using minimally biasing requirements followed by an optimized offline selection. The K- pi(+) pi(+) mass distribution is used to identify the D+ signal, and the D+ transverse impact-parameter distribution is used to separate prompt production, occurring directly in the hard-scattering process, from secondary production from b-hadron decays. We obtain a prompt D+ signal of 2950 candidates corresponding to a total cross section sigma(D+), 1.5 < P-T < 14.5 GeV/c, vertical bar y vertical bar < 1) = 71.9 +/- 6.8 (stat) +/- 9.3 (syst) mu b.While the measured cross sections are consistent with theoretical estimates in each p(T) bin, the shape of the observed p(T) spectrum is softer than the expectation from quantum chromodynamics. The results are unique in p<(p)over bar> collisions and can improve the shape and uncertainties of future predictions.</P>
Kim, E.-A.,Cho, C. H.,Kim, D. W.,Choi, S. Y.,Huh, J.-W.,Cho, S.-W. Harwood Academic 2015 Free radical research Vol.49 No.4
<P>We have previously shown that 2-(3-(benzo[d]thiazol-2-yl)ureido)acetate (KHG21834) attenuates amyloid beta(Aβ)<SUB>25-35</SUB>-induced apoptotic death and shows anti-inflammatory activity against Aβ<SUB>25-35</SUB>-induced microglial activation. However, antioxidative effects of KHG21834 against Aβ-induced oxidative stress have not yet been reported. In the present study, we investigated the antioxidative function of KHG21834 in primary cultured cortical neurons, to expand the potential therapeutic efficacy of KHG21834. Pretreatment with KHG21834 protected against Aβ-induced neuronal cell death and mitochondrial damage, and significantly restored GSH levels and the activities of catalase, superoxide dismutase, and glutathione peroxidase, and also suppressed the production of reactive oxygen species and protein oxidation. These results imply that KHG21834 may play a role in cellular defense mechanisms against Aβ-induced oxidative stress in cultured cortical neurons. Furthermore, KHG21834 significantly attenuated the effects of Aβ treatment on levels of NF-κB, β-catenin, and GSK-3β proteins in cortical neurons. Taken together, our results suggest that the antioxidant effects of KHG21834 may result at least in part from its ability to regulate the NF-κB, β-catenin, and GSK-3β signaling pathways. To our knowledge, this is the first report showing that KHG21834 significantly attenuates Aβ<SUB>25-35</SUB>-induced oxidative stress in primary cortical neurons, and provides novel insights into KHG21834 as a possible therapeutic agent for the treatment of Aβ-mediated neurotoxicity involving oxidative stress.</P>
Lee, S.H.,Oh, D.J.,Hwang, A.Y.,Park, J.W.,Jeong, J.K. Elsevier Sequoia 2017 THIN SOLID FILMS - Vol.637 No.-
A low resistivity copper (Cu) film was used as a source/drain contact layer to fabricate high performance amorphous In-Zn-Sn-O (a-IZTO) thin-film transistors (TFTs). The calcium (Ca)-doped Cu films greatly simplified the conventional Cu/diffusion barrier stack structure and process, which allowed the production of promising a-IZTO TFTs with a saturation mobility of 22.8cm<SUP>2</SUP>/Vs and an I<SUB>ON/OFF</SUB> ratio of 10<SUP>8</SUP>. Furthermore, the a-IZTO TFTs with the Ca-doped Cu contact exhibited better gate bias thermal stress-induced stabilities than those with the pure Cu contact. This was attributed to the effective formation of a self-diffusion CuO<SUB>x</SUB> barrier at the Cu/IZTO interfaces.
Assessment of Replication and Virulence of Attenuated Pseudorabies Virus in Swine
T. J. Newby,D. P. Carter,K.-J. Yoon,M. W. Jackwood,P. A. Hawkins 대한수의학회 2002 Journal of Veterinary Science Vol.3 No.2
A nonclinical study was conducted to characterizethe replication behavior of a modified live gE-deletedpseudorabies virus (PRV MS+1) in swine and potentialfor reversion to virulence after animal passages.Twoto 3 week-old weaned pigs, negative for PRV, weremaintained in isolation and challenged by intranasalinstillation.For the first passage,6 pigs were given 1mL of PRV MS+1 (107.3 TCID50/mL) an d 2 w erenecropsied at 3, 4 and 5 days post-inoculation (PI).Brain and secondary lymphoid tissues were collected,homogenized and the supernatants individually pooledfor virus isolation,and PRV was recovered from eachsample. No clinical signs of PRV in fection w ereobserved, but each pig had a nasal swab suspect orpositive for PRV.For the second passage,5 pigs weregiven 1 mL of the homogenate of mixed tissues from1 animal in the previous passage (PRV at 101.9TCID50/mL). At 5 days PI, all pigs were necropsied,and PRV w as n ot recovered from their tissu ehomogenates or nasal swabs, and no clinical signswere observed. During a second attempt at a secondpassage,tissue homogenates from all pigs in the firstpassage (PRV at approximately 101.7 TCID50/mL) werepooled and used to inoculate 15 pigs with 2 mL for 3consecutive days.Ten pigs were monitored for clinicalsigns and seroconversion through 21 days PI, and 5pigs were necropsied at 5 days PI.No clinical signs orPRV antibodies were detected in the 10 monitoredpigs,and no PRV was recovered from the homogenatesor nasal swabs of the 5 necropsied pigs. Thus, noevidence of reversion to virulence was demonstratedin pigs given the attenuated PRV.
T.A. Gunadi,W.S. Bae,J.H. Lee,H.D. Nguyen,A. Netzhanova,W.S. Ryoo 한국암반공학회 2013 한국암반공학회 학술대회 및 세미나 자료집 Vol.2013 No.3
Shale gas resources have been aggressively sought out for the past few years. The resurfacing and evolution of hydraulic fracturing technology has been triggered by the need to fracture shale-gas in a massive scale. Although the basic ideas for fracturing are similar between conventional fracturing for formation damage mitigation and slickwater fracturing for shale gas, the fluids’ characteristics are much different.Thus, better understanding of slickwater slurry behavior is critical to ensure a successful fracturing job, effective both engineering-wise and economically. This paper presents the results of related studies in the behavior of slickwater slurries. The experiments comprise of a study on fluids’ rheology with a Brookfield Viscometer, and also the observation of the proppant slurries in flowing conditions. The polymers used to make the slickwater slurries composed of polyacrylamides manufactured domestically in Korea. As for proppant, Carboceramics proppant of 20/40 US Mesh and 40/70 US Mesh were used. A parallel-plate setup was designed to model a simplified fracture, and later used to analyze the flow of proppant slurries with different friction reducers, proppant sizes, and proppant concentrations. The slurries were made according to typical designs previously applied in the field. Observation results showed that proppant settling in slickwater does not resemble proppant settling in viscosified gel solutions and that the horizontal transport of proppant relies on the building of proppant beds. Larger proppants tend to quickly form a ‘dune’ near the entrance of the fracture model until it reached an equilibrium height. The flow velocity of the fluids increased over the dune and increased the transport capability of smaller-sized proppant deeper into the fracture. Previous authors have studied that by modifying pumping schedules based on these results, gas production remarkably increased. In light of this, further plans in studying the modification pumping schedules based on this study are underway.
What is the interobserver agreement of displaced humeral surgical neck fracture patterns?
Reinier W. A. Spek,Laura J. Kim,Traumaplatform 3D Consortium 대한견주관절의학회 2022 대한견주관절의학회지 Vol.25 No.4
Background: The Boileau classification distinguishes three surgical neck fracture patterns: types A, B, and C. However, the reproducibility of this classification on plain radiographs is unclear. Therefore, we questioned what the interobserver agreement and accuracy of displaced surgical neck fracture patterns is categorized according to the modified Boileau classification. Does the reliability to recognize these fracture patterns differ between orthopedic residents and attending surgeons? Methods: This interobserver study consisted of a randomly retrieved series of 30 plain radiographs representing clinical practice in a level 1 and a level 2 trauma center. Radiographs were included from patients (≥18 years) who sustained an isolated displaced surgical neck fracture if they were taken ≤1 week after initial injury. A ground truth was established by consensus among three senior orthopedic surgeons. All images were assessed by 17 orthopedic residents and 17 attending orthopedic trauma surgeons. Results: Agreement for the modified Boileau classification was fair (κ=0.37; 95% confidence interval [CI], 0.36–0.38) with an accuracy of 62% (95% CI, 57%–66%). Comparison of interobserver variability between residents and attending surgeons revealed a significant but clinically irrelevant difference in favor of attending surgeons (0.34 vs. 0.39, respectively, Δ κ=0.05, 95% CI, 0.02–0.07). Conclusions: The modified Boileau classification yields a low interobserver agreement with an unsatisfactory accuracy in a panel of orthopedic residents and attending surgeons. This supports the hypothesis that surgical neck fractures are challenging to categorize and that this classification should not be used to determine prognosis if only plain radiographs are available.