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Search Results: 1 - 10 of 672166 matches for " S. A. Uzunyan "
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Search for Squarks and Gluinos with the D0 detector
Sergey A. Uzunyan
Physics , 2009,
Abstract: We report on D0 searches for scalar quarks (tilde-q) and gluinos (tilde-g), the superpartners of quark and gluons, in topologies involving jets and missing transverse energies. Data samples obtained with D0 detector from proton anti-proton collisions at a center-of-mass energy of 1.96 TeV corresponding to an intergrated luminosities of 1-4 inverse-fb were analyzed. No evidence for the production of such particles were observed and lower limits on squarks and gluino masses were set.
Search for Leptoquarks with the D0 detector
Sergey A. Uzunyan
Physics , 2009,
Abstract: We report on D0 searches for leptoquarks (LQ) predicted in extended gauge theories and composite models to explain the symmetry between quarks and leptons. Data samples obtained with the D0 detector from proton-antiproton collisions at a center-of-mass energy of 1.96 TeV corresponding to intergrated luminosities of 1--4 inverse-fb were analyzed. No evidence for the production of such particles were observed and lower limits on leptoquark masses are set.
A New Proton CT Scanner
G. Coutrakon,G. Blazey,S. Boi,A. Dyshkant,B. Erdelyi,D. Hedin,E. Johnson,J. Krider,V. Rykalin,S. A. Uzunyan,V. Zutshi,R. Fordt,G. Sellberg,J . E. Rauch,M. Roman,P. Rubinov,P. Wilson,M. Naimuddin
Physics , 2014,
Abstract: The design, construction, and preliminary testing of a second generation proton CT scanner is presented. All current treatment planning systems at proton therapy centers use X-ray CT as the primary imaging modality for treatment planning to calculate doses to tumor and healthy tissues. One of the limitations of X-ray CT is in the conversion of X-ray attenuation coefficients to relative (proton) stopping powers, or RSP. This results in more proton range uncertainty, larger target volumes and therefore, more dose to healthy tissues. To help improve this, we present a novel scanner capable of high dose rates, up to 2~MHz, and large area coverage, 20~x~24~cm$^2$, for imaging an adult head phantom and reconstructing more accurate RSP values.
Development of a proton Computed Tomography Detector System
Md. Naimuddin,G. Coutrakon,G. Blazey,S. Boi,A. Dyshkant,B. Erdelyi,D. Hedin,E. Johnson,J. Krider,V. Rukalin,S. A. Uzunyan,V. Zutshi,R. Fordt,G. Sellberg,J. E. Rauch,M. Roman,P. Rubinov,P. Wilson
Physics , 2015,
Abstract: Computer tomography is one of the most promising new methods to image abnormal tissues inside the human body. Tomography is also used to position the patient accurately before radiation therapy. Hadron therapy for treating cancer has become one of the most advantageous and safe options. In order to fully utilize the advantages of hadron therapy, there is a necessity of performing radiography with hadrons as well. In this paper we present the development of a proton computed tomography system. Our second-generation proton tomography system consists of two upstream and two downstream trackers made up of fibers as active material and a range detector consisting of plastic scintillators. We present details of the detector system, readout electronics, and data acquisition system as well as the commissioning of the entire system. We also present preliminary results from the test beam of the range detector.
Development of a proton Computed Tomography (pCT) scanner at NIU
S. A. Uzunyan,G. Blazey,S. Boi,G. Coutrakon,A. Dyshkant,B. Erdelyi,A. Gearhart,D. Hedin,E. Johnson,J. Krider,V. Zutshi,R. Ford,T. Fitzpatrick,G. Sellberg,J. E. Rauch,M. Roman,P. Rubinov,P. Wilson,K. Lalwani,M. Naimuddin
Physics , 2013,
Abstract: We describe the development of a proton Computed Tomography (pCT) scanner at Northern Illinois University (NIU) in collaboration with Fermilab and Delhi University. This paper provides an overview of major components of the scanner and a detailed description of the data acquisition system (DAQ).
Performance of Scintillator Counters with Silicon Photomultiplier Readout
Mu2e Collaboration Cosmic Ray Veto Group,A. Artikov,V. Baranov,D. Chokheli,Yu. I. Davydov,E. C. Dukes,R. Ehrlich,K. Francis,M. J. Frank,V. Glagolev,R. C. Group,S. Hansen,A. Hocker,Y. Oksuzian,P. Rubinov,E. Song,S. Uzunyan,Y. Wu
Physics , 2015,
Abstract: The performance of scintillator counters with embedded wavelength-shifting fibers has been measured in the Fermilab Meson Test Beam Facility using 120 GeV protons. The counters were extruded with a titanium dioxide surface coating and two channels for fibers at the Fermilab NICADD facility. Each fiber end is read out by a 2*2 mm^2 silicon photomultiplier. The signals were amplified and digitized by a custom-made front-end electronics board. Combinations of 5*2 cm^2 and 6*2 cm^2 extrusion profiles with 1.4 and 1.8 mm diameter fibers were tested. The design is intended for the cosmic-ray veto detector for the Mu2e experiment at Fermilab. The light yield as a function of the transverse and longitudinal position of the beam will be given.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution  [PDF]
S. A. A. Sajadi
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2014, DOI: 10.4236/ojinm.2014.41001

The acidity and stability constants of M(Gly)1, M(Ttr)1, and M(Trp)1 M: Cu2+, Cu(Bpy2)2+, and Cu(Phen3)2+ complexes, were determined by potentiometric pH titration. It is shown that the stability of the binary Cu(L), (L: Gly, Ttr, and Trp) complex is determined by the basicity of the carboxylate group on one side and amino group on the other side. It is demonstrated that the equilibrium, Cu(Ha4)2+ + Cu(L) \"\"Cu(Har)(L) + Cu2+, is displacement due to the well known experience that mixed ligand complexes formed by a divalent 3d ion, a heteroaromatic N base and an O donor ligand possess increased stability. The stability constants of the 1:1 complexes formed between Cu2+, Cu(Bpy)2+ or Cu(Phen)2+

Retroperitoneal Cystic Lymphangioma: Case Report  [PDF]
S. A Fanaei, S. A Ziaee
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.24046
Abstract: Introduction: Retroperitoneal cystic lymphangioma is a rare benign tumor of the retroperitoneal lymphatics that usually manifests in infancy. It is worth to Report of unexpected presentation especially in Adult. Case Presentation: An adult patient with Left Lower abdominal was referred to our hospital. Abdominal ultra-sonography revealed a large, multilocular, cystic mass with an obscure margin. CT of the abdomen showed a large homogeneous mass. Laparoscopy revealed a huge retroperitoneal cystic lymphangioma confirmed by histopathology. Conclusion: Adult cyst lymphangioma is the rare benign tumor with unclear intra abdominal manifestation. In our report the retroperitoneum was the rare location of this tumor.
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