847 research outputs found
Simulation and efficiency studies of optical photon transportation and detection with plastic antineutrino detector modules
No full textCAKIR, Altan/0000-0002-8627-7689; Kandemir, Mustafa/0000-0002-3642-9699In this work, the simulation of optical photons is carried out in an antineutrino detector module consisting of a plastic scintillator connected to light guides and photomultipliers on both ends, which is considered to be used for remote reactor monitoring in the field of nuclear safety. Using Monte Carlo (MC) based GEANT4 simulation, numerous parameters influencing the light collection and thereby the energy resolution of the antineutrino detector module are studied: e.g., degrees of scintillator surface roughness, reflector type, and its applying method onto scintillator and light guide surface, the reflectivity of the reflector, light guide geometries and diameter of the photocathode. the impact of each parameter is investigated by looking at the detected spectrum, i.e. the number photoelectrons per depositing energy. in addition, the average light collection efficiency of the detector module and its spatial variation are calculated for each simulation setup. According to the simulation results, it is found that photocathode size, light guide shape, reflectivity of reflecting material and wrapping method show a significant impact on the light collection efficiency while scintillator surface polishing level and the choose of reflector type show relatively less impact. This study demonstrates that these parameters are very important in the design of plastic scintillator included antineutrino detectors to improve the energy resolution efficiency
Darqan Sigülengge, Altan Khan’s emissary to Ming China, 1570-1571
No full textDrawing from recently published Mongolian and Chinese sources of the Ming period such as Altan Khan’s biography and “The Memorials of Ministry of Army” (Bingbu zoushu), the author clarifies the identity of Darqan Sigülengge — Da-er-han Shou-ling-ge in Chinese —, an emissary of Altan Khan in the negociations with officials of Ming China in 1570-1571, of Toγuci Taisi, an official of Altan Khan, and of Buciγdai alias Bao Chongde.S’appuyant sur des sources chinoises et mongoles de la période Ming récemment publiées, telles que la biographie d’Altan Khan et les « Mémoires [au trône] du Ministère des Armées », l’auteur clarifie l’identité de Darqan Sigülengge — Da-er-han Shou-ling-ge en chinois —, un émissaire d’Altan Khan dans les négociations avec les fonctionnaires de la Chine des Ming en 1570-1571, de Toγuci Taisi, fonctionnaire d’Altan Khan, et de Buciγdai alias Bao Chongde
Recent Achievements in Numerical Simulation in Sheet Metal Forming Processes
No full textPurpose of this paper: During the recent 10-15 years, Computer Aided Process Planning and Die Design evolved as one of the most
important engineering tools in sheet metal forming, particularly in the automotive industry. This emerging role is strongly emphasized by
the rapid development of Finite Element Modelling, as well. The purpose of this paper is to give a general overview about the recent
achievements in this very important field of sheet metal forming and to introduce some special results in this development activity.
Design/methodology/approach: Concerning the CAE activities in sheet metal forming, there are two main approaches: one of them may
be regarded as knowledge based process planning, whilst the other as simulation based process planning. The author attempts to integrate
these two separate developments in knowledge and simulation based approach by linking commercial CAD and FEM systems.
Findings: Applying the above approach a more powerful and efficient process planning and die design solution can be achieved radically
reducing the time and cost of product development cycle and improving product quality.
Research limitations: Due to the different modelling approaches in CAD and FEM systems, the biggest challenge is to enhance the
robustness of data exchange capabilities between various systems to provide an even more streamlined information flow.
Practical implications: The proposed integrated solutions have great practical importance to improve the global competitiveness of sheet
metal forming in the very important segment of industry.
Originality/value: The concept described in this paper may have specific value both for process planning and die design engineers
New wave simulations to the (3+1)-dimensional modified Kdv-Zakharov-Kuznetsov equation
No full textInternational Conference on Numerical Analysis and Applied Mathematics (ICNAAM) - SEP 19-25, 2016 - Rhodes, GREECEWOS: 000410159800577In this study, we apply an effective method which is improved Bernoulli sub-equation function method (IBSEFM) to the (3+1)-dimensional modified KdV-Zakharov-Kuznetsov equation. It gives some new wave simulations such as complex and exponential structures. We check up whether all structures verify the (3+1)-dimensional modified KdV-Zakharov-Kuznetsov model. Then, we plot three and two dimensional surfaces of obtained solutions by using Wolfram Mathematica 9
Remarks on the Činggis Qaγan-u Altan Tobči
No full textThe Golden History of Chinggis khan (Cinggis Qa?an-u Altan Tobci) is an important Mongolian historical work. It was found in 1958, so its research history is not very long. This paper aims at pointing out the problems with its facsimile edition and attempts to define the date of writing of the only existing manuscript of this work. Finally, the author gives evidence that the original work must have been compiled in Qubilai’s era with the purpose of showing his legitimacy
A reactor antineutrino detector based on hexagonal scintillator bars
No full textCAKIR, Altan/0000-0002-8627-7689; Kandemir, Mustafa/0000-0002-3642-9699This study presents a new concept of segmented antineutrino detector based on hexagonal plastic scintillator bars for detecting antineutrinos from a nuclear reactor core. the choice of hexagonal scintillator bars is original and provides compactness. the proposed detector detects antineutrinos via inverse beta decay (IBD) with the prompt-delayed double coincidence. Owing to its segmented structure, the background, which satisfies the delayed coincidence condition can be eliminated by applying proper event selection cuts. in this manner, the main focus is to determine proper selection criteria to precisely tag the true IBD events. Monte-Carlo simulation is carried out to understand the characteristic of the IBD interaction in the proposed detector by using Geant4 toolkit. A set of event selection criteria is established based on the simulated data. It is found that a detection efficiency of 10% can be achieved with the selection condition applied. It is also shown that fast neutrons, which constitute the main background source for above-ground detection, can be effectively eliminated with these selection criteria. the motivation for this study is to install this compact detector at a short distance (<100 m) from the Akkuyu Nuclear Power Plant, which is expected to start operation in 2023
Comparison of plastic antineutrino detector designs in the context of near field reactor monitoring
No full textCAKIR, Altan/0000-0002-8627-7689; Kandemir, Mustafa/0000-0002-3642-9699We compare existing segmented plastic antineutrino detectors with our new geometrically improved design for antineutrino detection and light collection efficiency. the purpose of this study is to determine the most suitable design style for remote reactor monitoring in the context of nuclear safeguards. Using Monte Carlo based GEANT4 simulation package, we perform detector simulation based on two prominent experiments: Plastic antineutrino detector array (Panda) and Core monitoring by reactor antineutrino detector (Cormorad). in addition to these two well-known designs, another concept, the Panda2, can be obtained by making a small variation of Panda detector, is also considered in the simulation. the results show that the light collection efficiency of the Cormorad is substantially less with respect to the other two detectors while the highest antineutrino detection efficiency is achieved with the Cormorad and Panda2. Furthermore, as an alternative to these design choices, which are composed of an array of identical rectangular-shaped modules, we propose to combine regular hexagonal-shaped modules which minimizes the surface area of the whole detector and consequently reduces the number of optical readout channels considerably. With this approach, it is possible to obtain a detector configuration with a slightly higher detection efficiency with respect to the Panda design and a better energy resolution detector compared to the Cormorad design
Searches for SUSY in events with third-generation particles at CMS
No full textResults of searches for SUSY production at CMS in events with third-generation signatures are presented. Along with missing energy, the final states may include hadronic jets with or without b-quark tag, light leptons, and tau leptons. These features serve both to distinguish standard-model components, and sensitivity to those SUSY models that lead to final states rich of heavy-flavored particles
LIFE OF SAADET İKESUS ALTAN AND REVIEW OF "VOCAL EDUCATION" BOOK
No full textNot much research has been done on Saadet Ikesus Altan, a successful artist who created firsts in the art life in opera in addition to being an educator who broke grounds in music education. For this reason, this research was carried out in order to introduce Altan, to pass on her achievements and the firsts she made throughout his life, to transfer them to future generations, and to reveal the results by examining the first book written in the field of vocal education.
In the research, Altan's life was investigated using the literature review method and the book “Vocal Education and Conservation” was reviewed. As a result of the review, its strengths and weaknesses were revealed comparing it with today's vocal education books.
The information obtained from the sources and the results obtained by the reviews are explained.
Altan is one of the first Turkish female opera singers to perform in Europe. She is known as the "doyen of the educators" because she is the educator of many vocal artists and educators who have been trained until today. She is the first Turkish female voice instructor, opera director and author of the first book in the field of vocal education.
With Altan's transfer of her knowledge, experience and education to her book in order to develop a technique suitable for the Turkish throat, it has been determined that the book is quite well equipped compared to the period when it was written and is incomparably powerful than the books written in this direction. It is also important to provide a basis for other books written in this field in Turkey. Altan sets a great example to the next generations, both as an artist and as an educator
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