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Search Results: 1 - 10 of 9055 matches for " Silvia Andronic "
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Phonons near Peierls Structural Transition in Quasi-One-Dimensional Organic Crystals of TTF-TCNQ  [PDF]
Silvia Andronic, Anatolie Casian
Advances in Materials Physics and Chemistry (AMPC) , 2016, DOI: 10.4236/ampc.2016.64010
Abstract: The Peierls structural transition in quasi-one-dimensional organic crystals of TTF-TCNQ is investigated in the frame of a more complete physical model. The two most important electron-phonon interaction mechanisms are taken into account simultaneously. One is similar of that of deformation potential and the other is of polaron type. For simplicity, the 2D crystal model is considered. The renormalized phonon spectrum and the phonon polarization operator are calculated in the random phase approximation for different temperatures. The effects of interchain interaction on renormalized acoustic phonons and on the Peierls critical temperature are analyzed.
Metal-Insulator Transition of Peierls Type in Quasi-One-Dimensional Crystals of TTT2I3  [PDF]
Silvia Andronic, Anatolie Casian
Advances in Materials Physics and Chemistry (AMPC) , 2017, DOI: 10.4236/ampc.2017.75017
Abstract: We investigate the metal-insulator transition in quasi-one-dimensional organic crystals of tetrathiotetracene-iodide, TTT2I3, in the 2D model. A crystal physical model is applied which takes into account two the most important hole-phonon interaction mechanisms. One is similar to that of deformation potential and the other is of polaron type. The scattering on defects is also considered and it is crucial for the explanation of the transition. The phonon polarization operator and the renormalized phonon spectrum are calculated in the random phase approximation for different temperatures applying the method of Green functions. We show that the transition is of Peierls type. The effect of lattice distortion on the dispersion of renormalized acoustic phonons is analyzed.
THE SURGEON ROLE IN THE TREATMENT OF MALIGNANT TUMORS WITH LIVER METASTASIS
D. Andronic
Jurnalul de Chirurgie , 2008,
Abstract: Liver resection is the treatment of choice for isolated colorectal hepatic metastases; improvements in surgical technique and in perioperative and postoperative management resulted in increased safety of liver surgery with a good 5-year survival. The role of liver resection for other hepatic metastases is still to be defined: there is a lack of controlled, randomized, prospective studies and most published series report only a small number of cases. Tumor histology is a vital factor in outcome: gastrointestinal tumors, other than colorectal, have a worst prognosis. Most significant advances in patient outcome are the result of development of better systemic therapies to use in combination with gross tumor resection. Being a surgical oncologist today is a permanent and complex challenge. The media advertising new and miraculous therapies, the increasing pressure from financial institutions, the dilemma of how far to push the will to do something, the difficulty to accept defeat, the drive to perform more operations more quickly, the importance of clinical trials – just a part of the myriad of factors that influence the everyday decisions of a surgical oncologist.
Electron identification performance with ALICE TRD prototypes
A. Andronic
Physics , 2004, DOI: 10.1016/j.nima.2004.01.015
Abstract: We present the electron/pion identification performance measured with prototypes for ALICE TRD. Measured spectra of energy deposit of pions and electrons as well as their average values are presented and compared to calculations. Various radiators are investigated over the momentum range of 1 to 6 GeV/c. The time signature of TR is exploited in a bidimensional likelihood mothod.
Space charge in drift chambers operated with the Xe,CO2(15%) mixture
A. Andronic
Physics , 2004, DOI: 10.1016/j.nima.2004.01.076
Abstract: Using prototype modules of the ALICE Transition Radiation Detector we investigate space charge effects and the dependence of the pion rejection performance on the incident angle of the ionizing particle. The average pulse height distributions in the drift chambers operated with the Xe,CO2(15%) mixture provide quantitative information on the gas gain reduction due to space charge accumulating during the drift of the primary ionization. Our results demonstrate that the pion rejection performance of a TRD is better for tracks which are not at normal incidence to the anode wires. We present detailed simulations of detector signals, which reproduce the measurements and lend strong support to our interpretation of the measurements in terms of space charge effects.
Pulse height measurements and electron attachment in drift chambers operated with Xe,CO2 mixtures
A. Andronic
Physics , 2003, DOI: 10.1016/S0168-9002(02)02083-1
Abstract: We present pulse height measurements in drift chambers operated with Xe,CO2 gas mixtures. We investigate the attachment of primary electrons on oxygen and SF6 contaminants in the detection gas. The measurements are compared with simulations of properties of drifting electrons. We present two methods to check the gas quality: gas chromatography and Fe55 pulse height measurements using monitor detectors.
Energy loss of pions and electrons of 1 to 6 GeV/c in drift chambers operated with Xe,CO2(15%)
A. Andronic
Physics , 2003, DOI: 10.1016/j.nima.2003.11.036
Abstract: We present measurements of the energy loss of pions and electrons in drift chambers operated with a Xe,CO2(15%) mixture. The measurements are carried out for particle momenta from 1 to 6 GeV/c using prototype drift chambers for the ALICE TRD. Microscopic calculations are performed using input parameters calculated with GEANT3. These calculations reproduce well the measured average and most probable values for pions, but a higher Fermi plateau is required in order to reproduce our electron data. The widths of the measured distributions are smaller for data compared to the calculations. The electron/pion identification performance using the energy loss is also presented.
An overview of the experimental study of quark-gluon matter in high-energy nucleus-nucleus collisions
A. Andronic
Physics , 2014, DOI: 10.1142/S0217751X14300476
Abstract: An overview is given on the experimental study of quark-gluon matter produced in relativistic nucleus-nucleus collisions, with emphasis on recent measurements at the Large Hadron Collider.
Experimental results and phenomenology of quarkonium production in relativistic nuclear collisions
A. Andronic
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.10.009
Abstract: An overview of recent measurements of quarkonium production in nucleus-nucleus collisions and their understanding in theoretical models is given.
The study of quark-gluon matter in high-energy nucleus-nucleus collisions
A. Andronic
Physics , 2012, DOI: 10.1063/1.4768487
Abstract: A short overview is given on the study of hot matter produced in relativistic nucleus-nucleus collisions, with emphasis on recent measurements at the LHC.
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