| 1. |
- Adler, SS, et al.
(författare)
-
Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV
- 2004
-
Ingår i: Physical Review Letters. - 1079-7114. ; 93:20: 202002
-
Tidskriftsartikel (refereegranskat)abstract
- We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.
|
|
| 2. |
- Abt, I, et al.
(författare)
-
Inclusive V-0 production cross sections from 920 GeV fixed target proton-nucleus collisions
- 2003
-
Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 29:2, s. 181-190
-
Tidskriftsartikel (refereegranskat)abstract
- Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of K-S(0), Lambda, and (&ULambda;) over bar particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the proton-nucleon system. The ratios of differential cross sections dsigma(pA)(K-S(0))/dsigma(pA)(Lambda) and dsigma(pA)((&ULambda;) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/- 0.5 and 0.66 +/- 0.07, respectively, for x(F) approximate to -0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.
|
|
| 3. |
- Abt, I, et al.
(författare)
-
Measurement of the b(b)over-bar production cross section in 920 GeV fixed-target proton-nucleus collisions
- 2003
-
Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 26:3, s. 345-355
-
Tidskriftsartikel (refereegranskat)abstract
- Using the HERA-B detector, the b (b) over bar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b (b) over bar production was tagged via inclusive bottom quark decays into J/psi by exploiting the longitudinal separation of J/psi --> l(+)l(-) decay vertices from the primary proton-nucleus interaction. Both e(+)e(-) and mu(+)mu(-) channels have been reconstructed and the combined analysis yields the cross section sigma(b (b) over bar) = 32(-12)(+14)(stat) (+6)(-7)(sys) nb/nucleon.
|
|
| 4. |
|
|
| 5. |
- Lee, A. Y., et al.
(författare)
-
Bilateral vs. ipsilateral venography as the primary efficacy outcome measure in thromboprophylaxis clinical trials: a systematic review
- 2004
-
Ingår i: J Thromb Haemost. - 1538-7933. ; 2:10, s. 1752-9
-
Tidskriftsartikel (refereegranskat)abstract
- Contrast venography, in combination with symptomatic venous thromboembolism (VTE), is the standard efficacy outcome measure in clinical trials of thromboprophylaxis in major orthopedic surgery. It is uncertain whether performing bilateral venography offers any real advantage over venography of the operated leg alone. This study was undertaken to determine the risk of isolated contralateral deep vein thrombosis (DVT) following major orthopedic surgery and to evaluate whether bilateral venography, rather than venography on the operated leg alone, offers any gain in DVT detection and, thereby, improves efficiency in clinical study design. A systematic review of prospective studies that reported DVT incidence as the primary efficacy outcome based on mandatory bilateral venography in patients undergoing elective hip or knee arthroplasty or hip fracture repair was conducted. Based on the use of bilateral venography as a primary efficacy outcome measure, the incidence of any DVT is 16.7% following total hip replacement, 18.8% after hip fracture repair, and 33.8% after total knee replacement. While DVT risk in the operated leg varies depending on the type of surgery, the risk of isolated DVT in the non-operated leg is approximately 4% to 5% in all three procedures. By increasing the detection of any DVT, the use of bilateral venography reduces required sample size by 16% to 25% compared to ipsilateral venography. In clinical trials evaluating the efficacy of thromboprophylaxis in major orthopedic surgery, bilateral venography reduces the risk of undiagnosed DVT in the non-operated leg and improves the efficiency of study design by substantially reducing the sample size requirement.
|
|
| 6. |
- Turpie, A. G., et al.
(författare)
-
Fondaparinux
- 2004
-
Ingår i: J Am Acad Orthop Surg. - 1067-151X. ; 12:6, s. 371-5
-
Tidskriftsartikel (refereegranskat)
|
|
| 7. |
- Turpie, A. G., et al.
(författare)
-
Superiority of fondaparinux over enoxaparin in preventing venous thromboembolism in major orthopedic surgery using different efficacy end points
- 2004
-
Ingår i: Chest. - 0012-3692. ; 126:2, s. 501-8
-
Tidskriftsartikel (refereegranskat)abstract
- STUDY OBJECTIVES: To assess the relevance of various efficacy end points established for thromboprophylaxis trials, we compared the results of the fondaparinux phase III program in major orthopedic surgery using the original primary efficacy end point with those obtained when the efficacy end points recently suggested by the American College of Chest Physicians (ACCP) Consensus Conference on Antithrombotic Therapy and the European Committee for Proprietary Medicinal Products (CPMP) were used. SETTING AND PATIENTS: Fondaparinux was compared with enoxaparin in four multicenter, randomized, double-blind trials of major orthopedic surgery. The original primary efficacy end point consisted of a composite of deep-vein thrombosis detected by mandatory bilateral venography, documented symptomatic deep-vein thrombosis, or pulmonary embolism up to day 11. The efficacy end point established by the ACCP Consensus Conference on Antithrombotic Therapy comprises any proximal deep-vein thrombosis, symptomatic proven deep-vein thrombosis or pulmonary embolism, or fatal pulmonary embolism, and that established by the European CPMP comprises any proximal deep-vein thrombosis, symptomatic proven pulmonary embolism, or death from any cause. INTERVENTIONS: Patients were randomized to receive either subcutaneous fondaparinux (2.5 mg once daily) starting postoperatively or approved enoxaparin regimens. RESULTS: Using the original end point of the fondaparinux studies, the incidence of venous thromboembolism was 13.7% (371 of 2,703 patients) in the enoxaparin group compared with 6.8% (182 of 2,682 patients) in the fondaparinux group, with a common odds reduction of 55.2% (p = 10(-17); 95% confidence interval, 45.8% to 63.1%) in favor of fondaparinux. The respective incidences of efficacy end points with enoxaparin and fondaparinux were 3.3% and 1.7%, respectively, according to the ACCP definition, and 3.9% and 2.1%, respectively, according to the CPMP definition. The common odds reduction in favor of fondaparinux was 49.6% (p < 0.001) and 48.0% (p < 0.001), respectively. CONCLUSIONS: Fondaparinux was consistently more effective than enoxaparin in preventing venous thromboembolism in patients undergoing major orthopedic surgery, irrespective of the established composite outcomes used.
|
|
| 8. |
|
|
| 9. |
- Kuhn, Thomas, 1970-, et al.
(författare)
-
Water vapor continuum: absorption measurements at 350 Ghz and model calculations
- 2002
-
Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer. - 0022-4073 .- 1879-1352. ; 74:5, s. 545-562
-
Tidskriftsartikel (refereegranskat)abstract
- Absolute absorption rates of pure water vapor and mixtures of water vapor and nitrogen have been measured in the laboratory at 350 GHz. The dependence on pressure and temperature has been obtained. Additionally, a water vapor continuum parameter estimation, taking even the previous laboratory measurements from 150 to 350 GHz into account, is performed.
|
|
