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RISS 인기검색어
- 검색키워드
- 저자 : Kolev, Spas D. (검색결과 5 건)
- 무료
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UNIQUENESS OF THE ELEMENTARY PHYSICS DRIVING HETEROGENEOUS NUCLEATE BOILING AND FLASHING
Kolev Nikolay Ivanov Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.2
Boiling and flashing are driven by the same physics for nucleation, bubble growth, departure etc. An adequate model of boiling has to describe the flashing too. The subject of this paper is to prove this uniqueness of the elementary physics driving the both processes.
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Bi-Event Subtraction Technique at hadron colliders
Dutta, B.,Kamon, T.,Kolev, N.,Krislock, A. North-Holland Pub. Co 2011 Physics letters: B Vol.703 No.4
We propose the Bi-Event Subtraction Technique (BEST) as a method of modeling and subtracting large portions of the combinatoric background during reconstruction of particle decay chains at hadron colliders. The combinatoric background arises when it is impossible to know experimentally which observed particles come from the decay chain of interest. The background shape can be modeled by combining observed particles from different collision events and be subtracted away, greatly reducing the overall background. This idea has been demonstrated in various experiments in the past. We generalize it by showing how to apply BEST multiple times in a row to fully reconstruct a cascade decay. We show the power of BEST with two simulated examples of its application towards reconstruction of the top quark and a supersymmetric decay chain at the Large Hadron Collider.
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Flow Injection Stripping Potentiometry with Periodic Alternation of Flow Direction
Chow, Christoper W.K.,Kolev, Spas D.,Davey, David E. 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
A fully computerized flow injection (FI) manifold with a peristaltic pump allowing periodic alternation of the flow direction and incorporating a detector system capable of performing potentiometric stripping analysis (PSA) is outlined. The proposed measuring technique combines the attractive features of both traditional flow injection analysis (FIA) and batch PSA and at the same time overcomes some of the most serious drawbacks of the latter resulting from the fact that potentiostatic deposition and chemical stripping occur in the same solution. An experimental study of the influence of the main parameters of the flow system on its behaviour was performed using Cu(II) solutions in the parts per billion concentration range as samples. The potentiostatic deposition was carried out on a precoated Hg glassy carbon electrode while Hg(II) ions were utilized as oxidant in the chemical stripping step. The magnitude of the analytical signal is independent of the electrode area which allows miniaturization of the equipment. The results obtained suggest that the proposed technique could be implemented in compact, inexpensive and fully automated flow-through systems for quantitative determination of low concentration metals ions in various samples (e.g., heavy metals in environmental, food and pharmaceutical samples).
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Fusion Imaging in Neurosonology: Clinician’s Questions, Technical Potentials and Applicability
Stephan J. Schreiber,Georgios Sakas,Velizar Kolev,Stefano de Beni 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.4
Purpose Ultrasound is a well established imaging techniquewith widespread use in diagnosis and treatment monitoringof neurological diseases. However, direct and exact comparisonof results from conventional ultrasound with other frequentlyused diagnostic modalities like magnetic resonance imaging(MRI) or computed tomography (CT) is impaired by differentfield of views and non-identical imaging planes. A newtechnical approach - ultrasoud fusion imaging might help toovercome this problem. Methods Fusion imaging is a technique which allows directcomparison of live ultrasound images with exactly correspondingimages derived from pre-registered CT or MRI datasets. Different approaches for the matching procedure - manual orautomated - can be applied for image fusion and movementsof the patient are automatically corrected for. Results The technique can widely be applied within the fieldof neurosonology. Clinical examples are given for its use inextra- and intracranial analysis of brain supplying arteries,intracranial parenchymal lesions but also for its use inperipheral nerve and muscle disease. Conclusions Ultrasound fusion imaging is a promisingtechnique which permits easy and exact matching betweenlive ultrasound and CT or MRI image modalities, allowingfor the first time a direct comparison between these techniques. This is a major step forward towards the facilitation ofinformation exchange, reduction of interobserver variabilityand improvenment of image documentation.
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