Sample records for berezovski arkadi berezovski

  1. Arkady Benediktovich Migdal

    NASA Astrophysics Data System (ADS)

    Agasyan, N. O.; Belyayev, S. T.; Okun, L. B.; Sapershtein, E. E.


    The outstanding theoretical physicist Arkady Benediktovich Migdal was one of the pioneers of theoretical nuclear physics in the Soviet Union, the founder of a major scientific school, a man of diverse gifts and irresistible personal charm. A. B. Migdal was born on March 11, 1911, in Lida (Belarus). In the 1920s his family moved to Leningrad. Migdal produced his first scientific work at age 17. He then enrolled at the physics department of the Leningrad State University (LSU), but studied there only a short while: arrested, he spent over two months under investigation, then was released (releases were still granted sometimes then). From 1931 to 1936, while working at the factory "Electrical Appliance," he produced several scientific works. At this time he managed to recover a place at the LSU extension division. After graduation in 1936 A. B. Migdal enrolled in graduate school at the Leningrad Physical-Technical Institute, where he formed his research interests and his own research style. His thesis adviser was M. P. Bronshtein. [Note: See footnote, p. 171.] Despite the briefness of this contact with Bronshtein - in 1937 Matvei Petrovich was arrested and executed - this bright, talented and deep person played a major role in Migdal's scientific development...

  2. Ultrafast Coherent Control of a Single Electron Spin in a Quantum Dot

    NASA Astrophysics Data System (ADS)

    Mikkelsen, Maiken H.


    Practical quantum information processing schemes require fast single-qubit operations. For spin-based qubits, this involves performing arbitrary coherent rotations of the spin state on timescales much faster than the spin coherence time. While we recently demonstrated the ability to initialize and monitor the evolution of single spins in quantum dots (QDs)ootnotetextM. H. Mikkelsen, J. Berezovsky, N. G. Stoltz, L. A. Coldren, D. D. Awschalom, Nature Physics 3, 770 (2007); J. Berezovsky, M. H. Mikkelsen, O. Gywat, N. G. Stoltz, L. A. Coldren, and D. D. Awschalom, Science 314, 1916 (2006)., here we present an all-optical scheme for ultrafast manipulation of these states through arbitrary angles. The GaAs QDs are embedded in a diode structure to allow controllable charging of the QDs and positioned within a vertical optical cavity to enhance the small single spin signal. By applying off-resonant optical pulses, we coherently rotate a single electron spin in a QD up to π radians on picosecond timescales ootnotetextJ. Berezovsky, M. H. Mikkelsen, N. G. Stoltz, L. A. Coldren, D. D. Awschalom, Science 320, 349 (2008)..We directly observe this spin manipulation using time-resolved Kerr rotation spectroscopy at T=10K. Measurements of the spin rotation as a function of laser detuning and intensity confirm that the optical Stark effect is the operative mechanism and the results are well-described by a model including the electron-nuclear spin interaction. Using short tipping pulses, this technique enables one to perform a large number of operations within the coherence time. This ability to perform arbitrary single-qubit operations enables sequential all-optical initialization, ultrafast control and detection of a single electron spin for quantum information purposes.

  3. Manipulating single electron spins and coherence in quantum dots

    NASA Astrophysics Data System (ADS)

    Awschalom, David


    The non-destructive detection of a single electron spin in a quantum dot (QD) is demonstrated using a time- averaged magneto-optical Kerr rotation measurementootnotetextJ. Berezovsky, M. H. Mikkelsen, O. Gywat, N. G. Stoltz, L. A. Coldren, and D. D. Awschalom, Science 314, 1916 (2006).. This technique provides a means to directly probe the spin off- resonance, thus minimally disturbing the system. Furthermore, the ability to sequentially initialize, manipulate, and read out the state of a qubit, such as an electron spin in a quantum dot, is necessary for virtually any scheme for quantum information processing. In addition to the time-averaged measurements, we have extended the single dot KR technique into the time domain with pulsed pump and probe lasers, allowing the observation of the coherent evolution of an electron spin stateootnotetextM. H. Mikkelsen, J. Berezovsky, N. G. Stoltz, L. A. Coldren, and D. D. Awschalom, Nature Physics 3, 770 (2007).. The dot is formed by interface fluctuations of a GaAs quantum well and embedded in a diode structure to allow controllable gating/charging of the QD. To enhance the small single spin signal, the QD is positioned within a vertical optical cavity. Observations of coherent single spin precession in an applied magnetic field allow a direct measurement of the electron g-factor and transverse spin lifetime. These measurements reveal information about the relevant spin decoherence mechanisms, while also providing a sensitive probe of the local nuclear spin environment. Finally, we have recently eveloped a scheme for high speed all-optical manipulation of the spin state that enables multiple operations within the coherence timeootnotetextJ. Berezovsky, M. H. Mikkelsen, N. G. Stoltz, L. A. Coldren, and D. D. Awschalom, accepted for publication (2008).. The results represent progress toward the control and coupling of single spins and photons for quantum information processingootnotetextS. Ghosh, W.H. Wang, F. M. Mendoza, R. C

  4. Heat exchange investigation and modernization of furnace of P-67 boiler of 800 MW unit

    NASA Astrophysics Data System (ADS)

    Bely, V. V.; Porozov, S. V.; Vasiliev, V. V.; Dekterev, A. A.; Tepfer, E. S.


    For the purpose of the development and introduction of the arrangements aimed at increasing the slagless power, economy, and reliability of the P-67 boiler of the 800 MW unit of the Berezovskaya Power Plant No. 1, the variation of heat-engineering characteristics of the coal (lignite) of the open-cast mine “Berezovsky-1” and its slag properties was investigated, the aerodynamics, heat exchange, formation of nitrogen oxides, and the intensity of local slag formation for different operation regimes and variants of the reconstruction of the furnace-burner device were modelled mathematically, the thermal efficiency of furnace walls was studied experimentally during their long-term operation, including the time after their mechanical cleaning, modernization of the system of water sootblowing, under low air excess, coal dust coarsening, loading the lower rows of burners, and lower air blowing.

  5. Kerr rotation studies of single electron spin dynamics in a quantum dot

    NASA Astrophysics Data System (ADS)

    Mikkelsen, M. H.; Berezovsky, J.; Gywat, O.; Stoltz, N. G.; Coldren, L. A.; Awschalom, D. D.


    Kerr rotation measurements are used to directly and non-destructively probe the dynamics of a single electron spin in a charge-tunable quantum dot. The dot is formed by interface fluctuations of a GaAs quantum well and embedded in a vertical optical cavity. Using Hanle techniques, we perform single electron Kerr rotation measurements at T=10K in order to monitor the depolarization of an optically pumped electron spin within an applied transverse magnetic field. This reveals information about the time averaged transverse spin lifetime, T2^*. At gate voltages for which the charging rate of the dot is relatively low, the results yield a T2^* in agreement with values expected from the hyperfine interaction in these materials. In contrast, at larger charging rates, we find that T2^* is strongly reduced, indicating the importance of additional decoherence mechanisms in that regime. J. Berezovsky, M. H. Mikkelsen, O. Gywat, N. G. Stoltz, L. A. Coldren, and D. D. Awschalom,Science Express, 9 November 2006, (10.1126/science.1133862).

  6. Selected Case From the Arkadi M. Rywlin International Pathology Slide Seminar: Benign Warthin Tumor of the Thyroid.


    Peckova, Kvetoslava; Daum, Ondrej; Michal, Michael; Curcikova, Radmila; Michal, Michal


    We report on an exceedingly rare lesion of the thyroid probably of a branchial cleft origin, which was not published in the world literature before. A 58-year-old woman underwent a total thyroidectomy for bilateral goiter. Grossly, there was one yellowish nodule sized 15 mm in the largest dimension found in the right lobe. Microscopically, the thyroid parenchyma showed signs of Hashimoto thyroiditis. The nodule in the right lobe was composed of a part of solid cell nests appearance, another part resembling a branchial cleft cyst, and a part resembling Warthin tumor. This lesion may belong to the histogenetically similar group of entities in the head and neck region which are derived from branchial cleft derivatives and which, under the inflammatory influence, have the ability to a cystic dilatation and proliferation of the epithelial component. The epithelium can afterwards become papillary and may undergo oncocytic transformation, thus gaining features that impart the resemblance of a Warthin tumor. Club members generally agreed with a submitted diagnosis of benign Warthin tumor of the thyroid. PMID:27438374

  7. Selected case from the Arkadi M. Rywlin International Pathology Slide Club: carcinoma of the transverse colon in a young girl.


    Galliani, Carlos A; Sanchez, Irene C; D'Errico, Maria M; Bisceglia, Michele


    We report a case of a 14-year-old female with primary adenocarcinoma of the transverse colon. She was hospitalized after presenting with abdominal pain and signs of intestinal obstruction. There was no health antecedent or family history of neoplasia. Physical examination revealed a distended abdomen. Tenderness was elicited to palpation of the right lower quadrant. Magnetic resonance imaging of the abdomen revealed obstructive signs, with a constricting lesion in the mid-transverse colon of probable neoplastic nature. Laparoscopic segmental resection of the colon was followed by standard right hemicolectomy. A circumferential mid-transverse tumor was diagnosed as primary colorectal carcinoma (CRC) of signet-ring cell type, AJCC stage IIIC, Dukes' C stage. On the basis of immunohistochemistry and clinical data, hereditary nonpolyposis and hamartomatous colorectal cancer syndromes were excluded. Involvement of either the p53, BRAF, or K-RAS genes was ruled out by immunohistochemistry profiling and genetic testing. The neoplasm was categorized as sporadic. The possibility of activation of the Wnt signaling pathway was suspected, because of a defective turnover of the β-catenin protein. Postoperatively, the patient was treated with both systemic and intra-abdominal adjuvant chemotherapy, including oxaliplatin. Between 18 and 24 months after diagnosis, intra-abdominal tumor recurrences were detected. The patient underwent bilateral oophorectomies for Krukenberg tumors and received salvage chemotherapy. Recently, additional recurrent metastatic retroperitoneal disease caused hydronephrosis. The retroperitoneal mass was debulked and a ureteric stent was placed. At the time of this writing, 43 months after diagnosis, the patient is receiving FOLFOX chemotherapy combined with panitumumab. CRC of childhood is exceedingly rare, generally develops in the setting of unrecognized genetic predisposing factors to cancer, presents with advanced disease, is high grade, and tends to have dismal prognosis. PMID:25844680

  8. Selected case from the Arkadi M. Rywlin International Pathology Slide Series: Asymmetric, segmental glomerulocystic kidney in an infant with tuberous sclerosis complex.


    Galliani, Carlos A; Gomez, Ana M; Panniello, Gaetano; Bisceglia, Michele


    A Hispanic newborn male, the product of nonconsanguineous parents, exhibited major and minor signs of tuberous sclerosis complex (TSC). MRI of the abdomen disclosed a discrete unilateral, cystic, right upper pole renal mass that prompted a nephrectomy. Histologic examination showed a polycystic renal mass that involved all segments of the nephron, with a preponderantly glomerulocystic pattern. The cysts were rounded, uniform, and small, most measuring 2 to 3 mm in diameter. The lining of the cysts was hyperplastic, made up of tall epithelial cells with eosinophilic granular cytoplasm and large nuclei, and focally formed mounds and papillary tufts. DNA analysis detected a constitutional deletion of exon 1 in the TSC2 gene on chromosome 16p13.3. Cystogenesis in TSC2 is manifested because of alteration or dysfunction of the primary cilium, where polycystin, the gene product of PKD1 gene, is localized. Renal cysts are often seen in TSC, varying in number from a few to innumerable, involving all segments of the nephron, including Bowman spaces, and are currently considered as one of the minor diagnostic features. A glomerulocystic pattern is a rare form of kidney involvement in TSC that aptly describes the innumerable cystically dilated Bowman spaces. Glomerulocystic kidney associated with the aforementioned hyperplastic epithelial lining (TSC epithelium) is sufficiently characteristic that could conceivably serve as a major TSC feature in the future. PMID:25664948

  9. PREFACE: Scientific and Publishing Editors

    NASA Astrophysics Data System (ADS)


    1.Scientific Editors Section 1: Particle physics Mikhail Skorohvatov - NRC Kurchatov Institute, Moscow, Russia Section 2: Nuclear physics Mikhail Danilov - ITEP NRC Kurchatov Institute, Moscow, Russia Section 3: Cosmic rays Arkady Galper - NRNU MEPhI, Moscow, Russia Anatoly Petrukhin - NRNU MEPhI, Moscow, Russia Section 4: Methods of experimental physics Valery Dmitrenko - NRNU MEPhI, Moscow, Russia 2.Publishing Editors Irene Arkhangelskaja - NRNU MEPhI, Moscow, Russia Pavel Buzhan - NRNU MEPhI, Moscow, Russia

  10. PREFACE: Physics approaches to protein interactions and gene regulation Physics approaches to protein interactions and gene regulation

    NASA Astrophysics Data System (ADS)

    Nussinov, Ruth; Panchenko, Anna R.; Przytycka, Teresa


    we have assembled a representative set of papers written by experts with diverse scientific backgrounds, each offering a unique viewpoint on using computational and physics methods to study biological systems at different levels of organization. We start with studies that aim to decipher the mechanisms of molecular recognition using biophysics methods and then expand our scale, concluding the issue with studies of interaction networks at cellular and population levels. Biomolecules interact with each other in a highly specific manner and selectively recognize their partners among hundreds of thousands of other molecules. As the paper by Zhang et al points out, this recognition process should be fast and guided by long-range electrostatic forces that select and bring the interacting partners together. The authors show that the increase of salt concentration leads to destabilization of protein complexes, suggesting an optimization of the charge-charge interactions across the protein binding interfaces. The following paper by Berezovsky further explores the balance of different interactions in protein complexes and uses physical concepts to explain the entire spectrum of protein structural classes, from intrinsically disordered to hyperthermostable proteins. The author describes highly unstructured viral proteins at one end of the spectrum and discusses the balance of stabilizing interactions in protein complexes from thermophilic organisms at the other. Recently accumulated evidence has indicated that native proteins do not necessarily require a unique structure to be biologically active, and in some cases structural disorder or intrinsic flexibility can be a prerequisite for their function. From the physical point of view, these disordered/flexible proteins exist in dynamic equilibrium between different conformational states, some of which could be selected upon binding to another partner. Such a property allows disordered proteins to achieve specific binding and at

  11. Towards a complete Fermi surface in underdoped high Tc superconductors

    NASA Astrophysics Data System (ADS)

    Harrison, Neil

    The discovery of magnetic quantum oscillations in underdoped high Tc superconductors raised many questions, and initiated a quest to understand the origin of the Fermi surface the like of which had not been seen since the very first discovery of quantum oscillations in elemental bismuth. While studies of the Fermi surface of materials are today mostly assisted by computer codes for calculating the electronic band structure, this was not the case in the underdoped high Tc materials. The Fermi surface was shown to reconstructed into small pockets, yet there was no hint of a viable order parameter. Crucial clues to understanding the origin of the Fermi surface were provided by the small value of the observed Fermi surface cross-section, the negative Hall coefficient and the small electronic heat capacity at high magnetic fields. We also know that the magnetic fields were likely to be too weak to destroy the pseudogap and that vortex pinning effects could be seen to persist to high magnetic fields at low temperatures. I will show that the Fermi surface that appears to fit best with the experimental observations is a small electron pocket formed by connecting the nodal `Fermi arcs' seen in photoemission experiments, corresponding to a density-wave state with two different orthogonal ordering vectors. The existence of such order has subsequently been detected by x-ray scattering experiments, thereby strengthening the case for charge ordering being responsible for reconstructing the Fermi surface. I will discuss new efforts to understand the relationship between the charge ordering and the pseudogap state, discussing the fate of the quasiparticles in the antinodal region and the dimensionality of the Fermi surface. The author acknowledges contributions from Suchitra Sebastian, Brad Ramshaw, Mun Chan, Yu-Te Hsu, Mate Hartstein, Gil Lonzarich, Beng Tan, Arkady Shekhter, Fedor Balakirev, Ross McDonald, Jon Betts, Moaz Altarawneh, Zengwei Zhu, Chuck Mielke, James Day, Doug

  12. Active Faults and Seismic Sources of the Middle East Region: Earthquake Model of the Middle East (EMME) Project

    NASA Astrophysics Data System (ADS)

    Gulen, L.; EMME WP2 Team*


    displacement for major fault zones. A digital reference library, that includes the pdf files of relevant papers, reports and maps, is also prepared. A logic tree approach is utilized to encompass different interpretations for the areas where there is no consensus. Finally seismic source zones in the Middle East region have been delineated using all available data. *EMME Project WP2 Team: Levent Gülen, Murat Utkucu, M. Dinçer Köksal, Hilal Yalçin, Yigit Ince, Mine Demircioglu, Shota Adamia, Nino Sadradze, Aleksandre Gvencadze, Arkadi Karakhanyan, Mher Avanesyan, Tahir Mammadli, Gurban Yetirmishli, Arif Axundov, Khaled Hessami, M. Asif Khan, M. Sayab.

  13. Earthquake Model of the Middle East (EMME) Project: Active Fault Database for the Middle East Region

    NASA Astrophysics Data System (ADS)

    Gülen, L.; Wp2 Team


    a strain and slip rate map of the Middle East region by basically compiling already published data. The third task is to calculate b-values, Mmax and determine the activity rates. New data and evidences will be interpreted to revise or modify the existing source models. A logic tree approach will be utilized for the areas where there is no consensus to encompass different interpretations. Finally seismic source zones in the Middle East region will be delineated using all available data. EMME Project WP2 Team: Levent Gülen, Murat Utkucu, M. Dinçer Köksal, Hilal Domaç, Yigit Ince, Mine Demircioglu, Shota Adamia, Nino Sandradze, Aleksandre Gvencadze, Arkadi Karakhanyan, Mher Avanesyan, Tahir Mammadli, Gurban Yetirmishli, Arif Axundov, Khaled Hessami, M. Asif Khan, M. Sayab.

  14. PREFACE: 21st Latin American Symposium on Solid State Physics (SLAFES XXI)

    NASA Astrophysics Data System (ADS)

    Aguiar, J. Albino


    Colombia e-mail: Professor Laura T Corredor Bohórquez Departamento de Física Universidade Federal de Pernambuco 50670-901 Recife PE Brazil e-mail: Professor Arkady Shanenko Departamento de Física Universidade Federal de Pernambuco 50670-901 Recife PE Brazil e-mail: Professor Renato F Jardim Instituto de Física Universidade de S\\~ao Paulo CP 66318 S\\~ao Paulo SP Brazil e-mail: Professor Francois Peeters Department Fysica Universiteit Antwerpen Groneneborgerlann 171 B-2020, Antwerpen Belgium e-mail: Organizing committee ChairmanCarlos Arturo Parra Vargas Proceedings EditorJosé Albino Aguiar Program ChairJairo Roa-Rojas SecretaryAura Janeth Barón González TreasurerArmando Sarmiento Santos Speaker ChairRafael González Hernández Fernando Naranjo Mayorga David A Landínez Téllez Jesús Oswaldo Morán José Sierra Ortega

  15. EDITORIAL: Focus on Mechanical Systems at the Quantum Limit FOCUS ON MECHANICAL SYSTEMS AT THE QUANTUM LIMIT

    NASA Astrophysics Data System (ADS)

    Aspelmeyer, Markus; Schwab, Keith


    progress was reported almost on a monthly basis and new groups entered the field. We intend to keep submission to this Focus Issue open for some time and invite everyone to share their latest results with us. And finally, a note to our fellow colleagues: keep up the good work! We would like to call the next Focus Issue 'Mechanical Systems IN the Quantum Regime'. Focus on Mechanical Systems at the Quantum Limit Contents Parametric coupling between macroscopic quantum resonators L Tian, M S Allman and R W Simmonds Quantum noise in a nanomechanical Duffing resonator E Babourina-Brooks, A Doherty and G J Milburn Creating and verifying a quantum superposition in a micro-optomechanical system Dustin Kleckner, Igor Pikovski, Evan Jeffrey, Luuk Ament, Eric Eliel, Jeroen van den Brink and Dirk Bouwmeester Ground-state cooling of a nanomechanical resonator via a Cooper-pair box qubit Konstanze Jaehne, Klemens Hammerer and Margareta Wallquist Dissipation in circuit quantum electrodynamics: lasing and cooling of a low-frequency oscillator Julian Hauss, Arkady Fedorov, Stephan André, Valentina Brosco, Carsten Hutter, Robin Kothari, Sunil Yeshwanth, Alexander Shnirman and Gerd Schön Route to ponderomotive entanglement of light via optically trapped mirrors Christopher Wipf, Thomas Corbitt, Yanbei Chen and Nergis Mavalvala Nanomechanical-resonator-assisted induced transparency in a Cooper-pair box system Xiao-Zhong Yuan, Hsi-Sheng Goan, Chien-Hung Lin, Ka-Di Zhu and Yi-Wen Jiang High-sensitivity monitoring of micromechanical vibration using optical whispering gallery mode resonators A Schliesser, G Anetsberger, R Rivière, O Arcizet and T J Kippenberg Optomechanical to mechanical entanglement transformation Giovanni Vacanti, Mauro Paternostro, G Massimo Palma and Vlatko Vedral The optomechanical instability in the quantum regime Max Ludwig, Björn Kubala and Florian Marquardt Quantum limits of photothermal and radiation pressure cooling of a movable mirror M Pinard and A Dantan

  16. List of Participants

    NASA Astrophysics Data System (ADS)


    teborg Cornelius Schmidt-ColinetEidgenössische Technische Hochschule (ETH), Zürich Johannes SchmudeSwansea University Waldemar SchulginLaboratoire de Physique Théorique, École Normale Supérieure, Paris Domenico SeminaraUniversità di Firenze Alexander SevrinVrije Universiteit, Brussel Konstadinos SfetsosUniversity of Patras Igor ShenderovichSt Petersburg State University Jonathan ShockUniversidade de Santiago de Compostela Massimo SianiUniversità di Milano-Bicocca Christoph SiegUniversità Degli Studi di Milano Joan SimonUniversity of Edinburgh Paul SmythUniversity of Hamburg Luca SommovigoUniversidad de Valencia Dmitri Sorokin Istituto Nazionale di Fisica Nucleare, Padova Christos SourdisUniversity of Patras Wieland StaessensVrije Universiteit, Brussel Ivan StefanovUniversity of Patras Sigurdur StefanssonUniversity of Iceland Kellogg Stelle Imperial College London Giovanni Tagliabue Università di Milano Laura Tamassia Katholieke Universiteit Leuven Javier TarrioUniversidade de Santiago de Compostela Dimitri TerrynVrije Universiteit, Brussel Larus Thorlacius University of Iceland Mario ToninDipartimento Di Fisica, Sezione Di Padova Mario Trigiante Politecnico di Torino Efstratios TsatisUniversity of Patras Arkady TseytlinImperial College London Pantelis TziveloglouCornell University, New York and CERN, Geneva Angel Uranga CERN, Geneva Dieter Van den Bleeken Katholieke Universiteit Leuven Ernst van Eijk Università di Napoli Federico II Antoine Van Proeyen Katholieke Universiteit Leuven Maaike van ZalkUtrecht University Pierre Vanhove Service de Physique Théorique, CEA Saclay Silvia Vaula Instituto de Física Teórica, Universidad Autónoma de Madrid Cristian Vergu Service de Physique Théorique, CEA Saclay Alessandro VichiÉcole Polytechnique Fédérale de Lausanne (EPFL) Marlene WeissCERN, Geneva and Eidgenössische Technische Hochschule (ETH), Zürich Sebastian Weiss Université de Neuchâtel Alexander WijnsUniversity of Iceland Linus WulffUniversity of Padova Thomas