We report on new measurements of the beam asymmetry for \omega\ photo-production on proton and neutron in Hydrogen and Deuterium targets from the GRAAL collaboration. The beam asymmetry values are ...extracted from the reaction threshold (E_{\gamma} = 1.1 GeV in the free nucleon kinematics) up to 1.5 GeV of incoming photon energy. For the first time both the radiative and the three-pion decay channels are simultaneously investigated on the free proton. Results from the two decay channels are in agreement and provide important constraints for the determination of resonant state contributions to the \omega\ production mechanism. First experimental results on the deuteron allow the extraction of the \Sigma\ beam asymmetry on quasi-free nucleons. Comparison of the results for free and quasi-free kinematics on the proton shows a generally reasonable agreement, similar to the findings in pseudo-scalar meson photo-production reactions. For the first time measurements on quasi-free neutrons are available, showing that both the strength and the angular distributions of the beam asymmetry are sensibly different from the results on the proton target.
Complications of Takayasu's arteritis are typically ischemic in nature because of progressive arterial narrowing, with aneurysm formation occurring as a late sequela. A 30-year-old Black woman with ...Takayasu's arteritis presented with a progressively enlarging and tender pulsatile mass at the base of the right neck. Upper extremity pulses were intact. Chest computed tomography and aortography demonstrated a 6-cm aneurysm of the right subclavian artery, which originated at the takeoff from the innominate artery, which was also ectatic. There was no evidence of occlusive disease. An operation was performed via the median sternotomy with transverse extension into the supraclavicular area. The distal innominate artery, proximal common carotid artery and entire subclavian artery were resected and replaced with a bifurcated stretch ePTFE graft. The aneurysm was without thrombus or atherosclerosis and all vessels were extremely thick-walled. Pathology revealed healed/healing nonspecific arteritis. Aneurysm formation is an unusual complication of Takayasu's arteritis. Previously reported sites of aneurysm formation include the thoracic and abdominal aorta, the innominate, carotid and superior mesenteric arteries, but not the subclavian artery. Of 28 patients enrolled in a recent clinical protocol at the National Institutes of Health with Takayasu's arteritis, none had aneurysm formation. The authors report surgical repair of a large aneurysm of the right subclavian artery in a young Black woman with Takayasu's arteritis.
Phys. Lett. B 730 (2014) 89-94 Neutral kaon pairs produced in phi decays in anti-symmetric entangled state
can be exploited to search for violation of CPT symmetry and Lorentz
invariance. We present ...an analysis of the CP-violating process phi->K_S
K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at
the Frascati phi-factory DAFNE. The data are used to perform a measurement of
the CPT-violating parameters Delta_amu for neutral kaons in the contest of the
Standard Model Extension framework. The parameters measured in the reference
frame of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x
10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeV
Delta_ay = (-2.0 +- 1.5_{stat} +- 0.5_{syst}) x 10^{-18} GeV Delta_az = ( 3.1
+- 1.7_{stat} +- 0.5_{syst}) x 10^{-18} GeV These are presently the most
precise measurements in the quark sector of the Standard Model Extension.
The left ventricular function has been examined in 20 drug addicts with echo-Doppler and echocardiographic methods. The results obtained demonstrate that, in a certain percentage of drug addicts, ...there is, in comparison to controls, a subclinical alteration of the ejection fraction and the circumferential shortening velocity; on the contrary, alterations of cardiac output are not observed.
Silicon oxynitride films were deposited by plasma-enhanced chemical vapor deposition at low temperatures using nitrous oxide (N sub(2)O) and silane (SiH sub(4)) as gas precursors. The influence of ...the N sub(2)O /SiH sub(4) flow ratio (varied from 0.25 up to 5) and the thickness of the films on the optical and structural properties of the material was analyzed. The films were characterized by ellipsometry, Fourier-transform infrared spectroscopy, Rutherford backscattering spectroscopy and optical absorption. Two distinct types of material were obtained, silicon dioxide-like oxynitrides SiO sub(2-x)N sub(x) and silicon-rich oxynitrides SiO sub(x)N sub(y) (x+y < 2). The results demonstrate that in silicon dioxide-like material, the nitrogen concentration can be adequately controlled (within the range 0-15 at.%) with total hydrogen incorporation below 5 at.% and no appreciable Si-H bonds. It is also shown that the composition remains uniform through the entire thickness of the films. Furthermore, a linear relation between the refractive index and the nitrogen concentration is observed, which makes this material very attractive for optoelectronic applications. On the other hand, silicon-rich material is similar to amorphous silicon, and presents an increasing concentration of Si-H bonds, increasing refractive index and decreasing optical gap, which makes it promising for applications in light-emitting devices. copyright 2002 Elsevier Science B.V. All rights reserved.
We report on world's smallest HfO 2 -based Resistive RAM (RRAM) cell to date, featuring a novel Hf/HfO x resistive element stack, with an area of less than 10×10 nm 2 , fast ns-range on/off switching ...times at low-voltages and with a switching energy per bit of <;0.1pJ. With excellent endurance of more than 5.10 7 cycles, large on/off verified-window (>;50), no closure of the on/off window after 30hrs/200C and failure-free device operation after 30hrs/250C thermal stress, the major device-level nonvolatile memory requirements are met. Furthermore, we clarify the impact of film crystallinity on cell operation from a scalability viewpoint, the role of the cap layer and bring insight into the switching mechanisms.
A review of the most recent results in flavour physics obtained by the KLOE experiment at DAΦNE collider together with prospects for kaon physics at KLOE-2 is presented. A brief description of KS ...meson lifetime measurement and determination of upper limit for BR(Ks→3π0) are discussed. In addition a CPT symmetry test in the Standard Model Extension framework and study of the Dalitz plot of η→π+π−π0 are reported. Last two sections are devoted to the KLOE-2 project and prospects in flavour physics.
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