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Search Results: 1 - 10 of 404818 matches for " Carlo M. Carbonaro "
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Proof of the thermodynamical stability of the E' center in SiO2
Carlo M. Carbonaro,Vincenzo Fiorentini,Fabio Bernardini
Physics , 2000, DOI: 10.1103/PhysRevLett.86.3064
Abstract: The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known since over 40 years. This center has been traditionally identified with a distorted, positively-charged oxygen vacancy V_O+. However, no direct proof of the stability of this defect has ever been provided, so that its identification is still strongly incomplete. Here we prove directly that distorted V_O+ is metastable and that it satisfies the key requirements for its identification as E', such as thermal and optical response, and activation-deactivation mechanisms.
Efficacy evaluation of a test CINtec® p16INK4a in screening for cervical HPV infection  [PDF]
Pafumi Carlo, Leanza Vito, Carbonaro Antonio, Leanza Gianluca, Stracquadanio Maria Grazia, D'Agati Alfio
Open Journal of Preventive Medicine (OJPM) , 2011, DOI: 10.4236/ojpm.2011.13020
Abstract: We submitted 437 patients with cytological alterations that suggest viral infections to HPV test. 154 patients (35.24%) resulted positive for HPV; among these, 128 (83.11%) with a low degree of infectivity, 19 (12.33%), with an average degree of infectivity and 7 (4.54%) with a high degree of infectivity).
Comment on "Structure and Hyperfine Parameters of E' Centers in alpha-quartz and Vitreous SiO2"
Vincenzo Fiorentini,C. M. Carbonaro
Physics , 1997,
Abstract: We point out that contrary to a recent suggestion by Boero et al. (PRL 78, 887 (1997)) the +1 charge state of the oxygen vacancy in alpha-quartz cannot be invoked as a candidate E' center in alpha-quartz and silica.
Evaluation of Photoluminescence Properties of Some Poly(ethylene glycol) – Supported Coumarin Derivatives
Graziella Tocco,Carlo Maria Carbonaro,Gabriele Meli,Gianni Podda
Molecules , 2009, DOI: 10.3390/molecules14031044
Abstract: The immobilization of some coumarin derivatives on modified poly(ethylene glycol)s is reported and the influence of the polymeric support on the photoluminescence activity of the compounds is discussed. Upon ultraviolet excitation, the derivatives showed coumarin - related emission properties whose peak position and efficiency depended on the loading of the polymer and on the mesomeric effects of the substituents.
CD34+ stem cells from umbilical cord blood
Carlo Pafumi,Vito Leanza,Antonio Carbonaro,Gianluca Leanza
Clinics and Practice , 2011, DOI: 10.4081/cp.2011.e79
Abstract: We describe the relation between umbilical cord clamping time and two different enrichment system of CD34+ stem cells from umbilical cord blood with the proliferative ability and bone marrow reconstitution of the stem cells obtained. After an obstetrician performed the cord blood collection, the purification of stem cells was performed either with a combination of monoclonal antibodies (negative selections) using the Stem Sep method, or with a positive cells selection based on their surface CD34 antigens using the Mini Macs system. An excellent recovery of haematopoietic progenitors [Burst Forming Unit Erythroids (BFUE); Colony Forming Unit Granulocytes and Macrophages (CFU-GM); and Colony Forming Unit Granulocytes, Erythroids, Monocytes and Macrophages (CFU-GME)], inversely related to the increase in clamping time, was performed with the Mini Macs system (54% of colonies, with 90% purity). With Stem Sep method, haematopoietic progenitor’s recovery was 35% (with 80% purity). By applying early clamping of umbilical cord blood we obtained a greater number of CD34+ cells and their clonogenic activity was increased with enrichment. This is a useful technique considering that the number of CD34+ stem cells usually contained from a unit of placental blood is enough for the transplant to a child, but not for an adult. Thus, using these methods, we can get a larger number of CD34+ stem cells which reduces the risk of Graft versus Host Disease also in adult patients, producing survival rates similar to those obtained with transplantation of bone marrow from unrelated donors.
CD34+ stem cells from umbilical cord blood
Carlo Pafumi,Vito Leanza,Antonio Carbonaro,Gianluca Leanza
Clinics and Practice , 2011, DOI: 10.4081/cp.2011.e79
Abstract: We describe the relation between umbilical cord clamping time and two different enrichment system of CD34+ stem cells from umbilical cord blood with the proliferative ability and bone marrow reconstitution of the stem cells obtained. After an obstetrician performed the cord blood collection, the purification of stem cells was performed either with a combination of monoclonal antibodies (negative selections) using the Stem Sep method, or with a positive cells selection based on their surface CD34 antigens using the Mini Macs system. An excellent recovery of haematopoietic progenitors [Burst Forming Unit Erythroids (BFUE); Colony Forming Unit Granulocytes and Macrophages (CFU-GM); and Colony Forming Unit Granulocytes, Erythroids, Monocytes and Macrophages (CFU-GME)], inversely related to the increase in clamping time, was performed with the Mini Macs system (54% of colonies, with 90% purity). With Stem Sep method, haematopoietic progenitor’s recovery was 35% (with 80% purity). By applying early clamping of umbilical cord blood we obtained a greater number of CD34+ cells and their clonogenic activity was increased with enrichment. This is a useful technique considering that the number of CD34+ stem cells usually contained from a unit of placental blood is enough for the transplant to a child, but not for an adult. Thus, using these methods, we can get a larger number of CD34+ stem cells which reduces the risk of Graft versus Host Disease also in adult patients, producing survival rates similar to those obtained with transplantation of bone marrow from unrelated donors.
Ab-initio study of oxygen vacancies in alpha-quartz
C. M. Carbonaro,V. Fiorentini,S. Massidda
Physics , 1996, DOI: 10.1016/S0022-3093(97)00286-X
Abstract: Extrinsic levels, formation energies, and relaxation geometries are calculated ab initio for oxygen vacancies in alpha-quartz SiO2. The vacancy is found to be thermodynamically stable in the charge states Q=+3, Q=0, Q=--2, and Q=-3. The charged states are stabilized by large and asymmetric distortions near the vacancy site. Concurrently, Franck-Condon shifts for absorption and recombination related to these states are found to be strongly asymmetric. In undoped quartz, the ground state of the vacancy is the neutral charge state, while for moderate p-type and n-type doping, the +3 and -3 states are favored, respectively, over a wide Fermi level window. Optical transitions related to the vacancy are predicted at around 3 eV and 6.5 eV (absorption) and 2.5 to 3.0 eV (emission), depending on the charge state of the ground state.
Stability of Ge-related point defects and complexes in Ge-doped SiO_2
C. M. Carbonaro,V. Fiorentini,F. Bernardini
Physics , 2002, DOI: 10.1103/PhysRevB.66.233201
Abstract: We analyze Ge-related defects in Ge-doped SiO_2 using first-principles density functional techniques. Ge is incorporated at the level of ~ 1 mol % and above. The growth conditions of Ge:SiO_2 naturally set up oxygen deficiency, with vacancy concentration increasing by a factor 10^5 over undoped SiO_2, and O vacancies binding strongly to Ge impurities. All the centers considered exhibit potentially EPR-active states, candidates for the identification of the Ge(n) centers. Substitutional Ge produces an apparent gap shrinking via its extrinsic levels.
High-Capacity Quantum Associative Memories  [PDF]
M. Cristina Diamantini, Carlo A. Trugenberger
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.411207
Abstract: We review our models of quantum associative memories that represent the “quantization” of fully coupled neural networks like the Hopfield model. The idea is to replace the classical irreversible attractor dynamics driven by an Ising model with pattern-dependent weights by the reversible rotation of an input quantum state onto an output quantum state consisting of a linear superposition with probability amplitudes peaked on the stored pattern closest to the input in Hamming distance, resulting in a high probability of measuring a memory pattern very similar to the input. The unitary operator implementing this transformation can be formulated as a sequence of one-qubit and two-qubit elementary quantum gates and is thus the exponential of an ordered quantum Ising model with sequential operations and with pattern-dependent interactions, exactly as in the classical case. Probabilistic quantum memories, that make use of postselection of the measurement result of control qubits, overcome the famed linear storage limitation of their classical counterparts because they permit to completely eliminate crosstalk and spurious memories. The number of control qubits plays the role of an inverse fictitious temperature. The accuracy of pattern retrieval can be tuned by lowering the fictitious temperature under a critical value for quantum content association while the complexity of the retrieval algorithm remains polynomial for any number of patterns polynomial in the number of qubits. These models thus solve the capacity shortage problem of classical associative memories, providing a polynomial improvement in capacity. The price to pay is the probabilistic nature of information retrieval.
On the modelling of complex sociopsychological systems with some reasoning about Kate, Jules, and Jim
Nicola Bellomo,Bruno Carbonaro
International Journal of Differential Equations , 2006, DOI: 10.1155/denm/2006/86816
Abstract: This paper deals with the modelling of complex sociopsychological games and reciprocal feelings involving interacting individuals. The modelling is based on suitable developments of the methods of mathematical kinetic theory of active particles with special attention to modelling multiple interactions. A first approach to complexity analysis is proposed referring to both computational and modelling aspects.
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