Fen Edebiyat Fakültesi

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https://hdl.handle.net/20.500.12662/246

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On Third Order Bronze Fibonacci Quaternions
(Matematikçiler Derneği, 2022) Alo, Jeta
In this study, we define third order bronze Fibonacci quaternions. We obtain the generating functions, the Binet’s formula and some properties of these quaternions. We give d’Ocagne’s-like and Cassini’s-like identity and we use q-determinants for quaternionic matrices to give the Cassini’s identity for third order bronze Fibonacci quaternions.
The Mediator Role of Attitude Towards Aging and Elderliness in the Effect of the Meaning and Purpose of Life on Death Anxiety
(SPRINGER, 2022) Kahraman, Süleyman; Erkent, Damla
Older adults can frequently serve as a reminder of death to younger adults. People can develop a negative attitude towards aging and elderliness because they see old age as an obstacle in reaching their goals and what they want to do, which they see as the purpose of their lives. This research was conducted to answer to the question of whether attitudes towards aging and elderliness have a mediating role in the relationship between meaning and purpose of life and death anxiety. Relational screening model was used in the research. The research was conducted with 422 participants between the ages of 18-59. In the analysis of the data, Pearson Correlation Analysis and Regression analysis were performed. In addition, Hayes Macro was used in SPSS program to analyze the mediator variable efect. As a result, it was determined that the attitude towards aging had a signifcant mediator role in the efect of the meaning and purpose of life on death anxiety. It was found that there was a moderate positive correlation between the attitude towards aging and elderliness and death anxiety, a moderate negative correlation between the attitude towards aging and elderliness and the meaning and purpose of life, and a weak negative correlation between death anxiety and the meaning and purpose of life.
Systematic Study of LED Stimulated Recovery of Radiation Damage in Optical Materials
(Institute of Physics, 2022) Bilki, Burak
The radiation damage in optical materials mostly manifests itself as the loss of optical transmission. The optical materials recover from radiation damage to some extent in the presence of natural light, and at a faster rate in the presence of stimulating light. On the other hand, the systematic study of the dynamics of the recovery as a function of the stimulating light parameters such as its wavelength, intensity and exposure duration and method has not been performed in detail. We established an LED recovery station which provides pulsed and continuous light at various wavelengths at custom geometries. The study starts with the irradiation of optical samples at various gamma doses at a rate of 87.5 Gy/min. The optical transmittance of the samples are then measured in 200 nm - 1500 nm range for an extended period of time. Here we report on the details of the irradiation and recovery setups, and the results of recovery from radiation damage under different light exposure mechanisms
Subclass of Analytic Functions Connected with Double Zeta Function
(MDPI, 2022) Altınkaya, Şahsene; vd.
In this survey-cum-expository work, we primarily seek to study many families of the renowned Hurwitz–Lerch Zeta mapping, including the so-called generalized Hurwitz–Lerch Zeta mappings. The purpose of this study is to examine a new subclass of Hurwitz–Lerch Zeta mappings with negative coefficients in the unit disc U = {z ? C : |z| < 1}. We explore fundamental character istics of the defined class, such as coefficient inequality, neighborhoods, partial sums, and integral means properties.
Study of Light Production With A Fifty Liter Liquid Argon TPC
(Institute of Physics, 2022) Bilki, Burak; vd.
The Deep Underground Neutrino Experiment (DUNE) is the next very large scale neutrino science and proton decay experiment. DUNE will consist of large-scale near and far detectors. The core elements of these detector systems are liquid argon Time Projection Chambers (LAr TPCs) and light readout systems. Two prototype far detectors were built and operated at CERN Neutrino Platform and extensive developments are underway for improved and upgraded detectors. In order to evaluate various design alternatives and validate new concepts of light readout related to large-scale LAr detectors, we have performed several experiments with a fifty liter liquid argon TPC at CERN. Among the long list of configurations we probed, study of various wavelength shifters, operation in dual phase mode and Xe and N2 doping under different scenarios can be listed. Here we report on the details of the various test campaigns and discuss our findings and their impact on the design and operational parameters.
Separation of Track- and Shower-like Energy Deposits in ProtoDUNE-SP Using a Convolutional Neural Network
(SPRINGER, 2022) Bilki, Burak; vd.
Liquid argon time projection chamber detector technology provides high spatial and calorimetric resolutions on the charged particles traversing liquid argon. As a result, the technology has been used in a number of recent neutrino experiments, and is the technology of choice for the Deep Underground Neutrino Experiment (DUNE). In order to perform high precision measurements of neutrinos in the detector, final state particles need to be effectively identified, and their energy accurately reconstructed. This article proposes an algorithm based on a convolutional neural network to perform the classification of energy deposits and reconstructed particles as track-like or arising from electromag netic cascades. Results from testing the algorithm on experimental data from ProtoDUNE-SP, a prototype of the DUNE far detector, are presented. The network identifies track- and shower-like particles, as well as Michel electrons, with high efficiency. The performance of the algorithm is consistent between experimental data and simulation.
Secondary Emission Calorimetry
(MDPI, 2022) Bilki, Burak; vd.
Electromagnetic calorimetry in high-radiation environments, e.g., forward regions of lepton and hadron collider detectors, is quite challenging. Although total absorption crystal calorimeters have superior performance as electromagnetic calorimeters, the availability and the cost of the radiation-hard crystals are the limiting factors as radiation-tolerant implementations. Sampling calorimeters utilizing silicon sensors as the active media are also favorable in terms of performance but are challenged by high-radiation environments. In order to provide a solution for such imple mentations, we developed a radiation-hard, fast and cost effective technique, secondary emission calorimetry, and tested prototype secondary emission sensors in test beams. In a secondary emission detector module, secondary emission electrons are generated from a cathode when charged hadron or electromagnetic shower particles penetrate the secondary emission sampling module placed between absorber materials. The generated secondary emission electrons are then multiplied in a similar way as the photoelectrons in photomultiplier tubes. Here, we report on the principles of secondary emission calorimetry and the results from the beam tests performed at Fermilab Test Beam Facility as well as the Monte Carlo simulations of projected, large-scale secondary emission electromagnetic calorimeters
Scintillation light detection in the 6-m drift-length ProtoDUNE Dual Phase liquid argon TPC
(SPRINGER, 2022) Bilki, Burak; vd.
DUNE is a dual-site experiment for long-baseline neutrino oscillation studies, neutrino astrophysics and nucl eon decay searches. ProtoDUNE Dual Phase (DP) is a 6×6×6 m3 liquid argon time-projection-chamber (LArTPC) that recorded cosmic-muon data at the CERN Neutrino Plat form in 2019–2020 as a prototype of the DUNE Far Detector. Charged particles propagating through the LArTPC produce ionization and scintillation light. The scintillation light sig nal in these detectors can provide the trigger for non-beam events. In addition, it adds precise timing capabilities and improves the calorimetry measurements. In ProtoDUNE-DP, scintillation and electroluminescence light produced by cos mic muons in the LArTPC is collected by photomultiplier tubes placed up to 7 m away from the ionizing track. In this paper, the ProtoDUNE-DP photon detection system perfor mance is evaluated with a particular focus on the different wavelength shifters, such as PEN and TPB, and the use of Xe-doped LAr, considering its future use in giant LArTPCs. The scintillation light production and propagation processes are analyzed and a comparison of simulation to data is per formed, improving understanding of the liquid argon prop erties
On Third-Order Differential Subordination and Superordination Properties of Analytic Functions Defined by a Generalized Operator
(MDPI, 2022) Altınkaya, Şahsene
In this current study, we aim to give some results for third-order differential subordina tion and superordination for analytic functions in U = {z ? C : |z| < 1} involving the generalized operator I j ?,? f . The results are derived by investigating relevant classes of admissible functions. Some new results on differential subordination and superordination with some sandwich theorems are obtained. Moreover, several particular cases are also noted. The properties and results of the differential subordination are symmetry to the properties of the differential superordination to form the sandwich theorems.
On linear algebra of one type of symmetric matrices with harmonic Fibonacci entries
(BULGARIAN ACAD SCIENCE, 2022) Akbıyık, Mücahit; Yamaç Akbıyık, Seda; Yılmaz, Fatih
This paper focuses on a specially constructed matrix whose entries are harmonic Fibonacci numbers and considers its Hadamard exponential matrix. A lot of admiring algebraic properties are presented for both of them. Some of them are determinant, inverse in usual and in the Hadamard sense, permanents, some norms, etc. Additionally, a MATLAB-R2016a code is given to facilitate the calculations and to further enrich the content.
On a Certain Subclass of Analytic Functions Defined by Touchard Polynomials
(MDPI, 2022) Altınkaya, ¸Sahsene; vd.
This paper focuses on the establishment of a new subfamily of analytic functions includ ing Touchard polynomials. Then, we attempt to obtain geometric properties such as coefficient inequalities, distortion properties, extreme points, radii of starlikeness and convexity, partial sums, neighbourhood results and integral means’ inequality for this class. The symmetry properties of the subfamily of functions established in the current paper may be examined as future research directions.
Radiation Damage and Recovery Mechanisms in Scintillating Fibers
(Institute of Physics, 2022) Bilki, Burak
Optical scintillating bers lose their transparencies when exposed to radiation. Nearly all studies of radiation damage to optical bers so far only characterize this darkening with a single period of irradiation. Following the irradiation, bers undergo room temperature annealing, and regain some of their transparencies. We tested the irradiation-recovery characteristics of scintillating fibers in four consecutive cycles. In addition, three optical scintillating bers were irradiated at 22 Gy per minute for over 15 hours, and their transmittance were measured each minute by pulsing a light source through the bers. Here, we report on the in-situ characterization of the transmittance vs radiation exposure, allowing future applications to better predict the lifetime of the scintillating bers.
Measurement of Light Yield, Timing and Radiation Damage and Recovery of Common Plastic Scintillators
(Institute of Physics, 2022) Bilki, Burak; vd.
PEN and PET (polyethylene naphthalate and teraphthalate) are common plastics used for drink bottles and plastic food containers. They are also good scintillators. Their ubiquity has made them of interest for high energy physics applications, as generally plastic scintillators can be very expensive. However, detailed studies on the performance of the scintillators has not yet been performed. At various tests, we measured the light yield and timing properties of PEN and PET with Fermilab and CERN test beams. We also irradiated several samples to varying gamma doses and investigated their recovery mechanisms. Here we report on the measurements performed over the past few years in order to characterize the scintillation properties of PEN and PET and discuss possible future implementations.
Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment
(AMER PHYSICAL SOC, 2022) Dölek, Furkan; vd.
The Deep Underground Neutrino Experiment (DUNE) will produce world-leading neutrino oscillation measurements over the lifetime of the experiment. In this work, we explore DUNE’s sensitivity to observe charge-parity violation (CPV) in the neutrino sector, and to resolve the mass ordering, for exposures of up to 100 kiloton-megawatt-calendar years (kt-MW-CY), where calendar years include an assumption of 57% accelerator uptime based on past accelerator performance at Fermilab. The analysis includes detailed uncertainties on the flux prediction, the neutrino interaction model, and detector effects. We demonstrate that DUNE will be able to unambiguously resolve the neutrino mass ordering at a 4? (5?) level with a 66 (100) kt-MW-CY far detector exposure, and has the ability to make strong statements at significantly shorter exposures depending on the true value of other oscillation parameters, with a median sensitivity of 3? for almost all true ?CP values after only 24 kt-MW-CY. We also show that DUNE has the potential to make a robust measurement of CPV at a 3? level with a 100 kt-MW-CY exposure for the maximally CP-violating values ?CP ¼ ?=2. Additionally, the dependence of DUNE’s sensitivity on the exposure taken in neutrino-enhanced and antineutrino-enhanced running is discussed. An equal fraction of exposure taken in each beam mode is found to be close to optimal when considered over the entire space of interest.
Evaluation of cognitive functions in adult individuals with COVID-19
(Springer-Verlag Italia s.r.l., 2022) Ulu, Oğulcan; Akıncı, Büşra; Erkan Oğul, Özden; vd.
Background and Purpose Cognitive defcits that are associated with coronavirus disease 2019 (COVID-19) and occur in the acute period are gaining importance. While most studies have focused on the elderly severely afected during acute infection, it remains unclear whether mild to moderate COVID-19 results in cognitive defcits in young patients. This study aims to evaluate the post-infection cognitive functions of young adults with mild to moderate symptoms of COVID-19. Methods A total of 100 adults with similar age and educational background were included in the study. Half of those had been infected with COVID-19 in the last 60 days (N=50), and the other half had not (N=50). Global cognitive skills of the participants were evaluated through Montreal Cognitive Assessment Scale (MoCA) and Clock-Drawing Test; memory functions with Öktem Verbal Memory Processes Test (Ö-VMPT); attention span with Digit Span Test; executive functions with Fluency Tests, Stroop Test, and Trail Making Test; visual perceptual skills with Rey Osterrieth Complex Figure Test (ROCF); and neuropsychiatric status with Neuropsychiatric Inventory (NPI). Evaluations were performed in the experimental group for 21 to 60 days from the onset of the disease, and throughout the study, in the control group. Results It was found that global cognitive skills, verbal memory, visual memory, executive function, and neuropsychiatric status were afected during COVID-19 (p<0.05). Conclusion When the cases were analyzed according to disease severity, no relationship was found between cognitive defcits and disease severity
Development of Novel Designs of Resistive Plate Chambers
(Institute of Physics, 2022) Bilki, Burak; vd.
A novel design of Resistive Plate Chambers (RPCs), using only a single resistive plate, was developed and tested. Based on this design, prototype chambers of size ranging from 10 cm ´ 10 cm to 32 cm ´ 48 cm were constructed and tested with cosmic rays and particle beams. The tests confirmed the viability of this new approach for calorimetric applications where the particle rates do not exceed 1 kHz/cm2, such as CALICE digital calorimeters. The chambers also have improved single-particle response, such as a pad multiplicity close to unity.In addition to this development, we probed a new technique to mitigate limitations associated with common RPC gases compatible with the environment. The technique is based on electron multiplication in a thin layer of high secondary electron yield material coating on the anode plane. Here we report on the construction of various different glass RPC designs, and their performance measurements in laboratory tests and with particle beams.
Development of Novel Designs of Resistive Plate Chambers
(MDPI, 2022) Bilki, Burak; vd.
Resistive Plate Chambers (RPCs) are a key active media of the muon systems of current and future collider experiments as well as the CALICE (semi-)digital hadron calorimeter. The outstanding issues with RPCs can be listed as the loss of efficiency for the detection of particles when subjected to high particle fluxes and the limitations associated with the common RPC gases. We developed novel RPC designs with: low resistivity glass plates; a single resistive plate; and a single resistive plate and a special anode plate coated with high secondary electron emission yield material. The cosmic and beam tests confirmed the viability of these new approaches for calorimetric applications. The chambers also have improved single-particle response, such as a pad multiplicity close to unity. Here, we report on the construction of various different glass RPC designs and their performance measurements in laboratory tests and with particle beams. We also discuss future test plans, which include the long-term performance tests of the newly developed RPCs, investigation of minimal gas flow chambers, and feasibility study for the large-size chambers.
Development of an Argon Light Source as a Calibration and Quality Control Device for Liquid Argon Light Detectors
(Institute of Physics, 2022) Tosun, Mehmet; Bilki, Burak; vd.
The majority of future large-scale neutrino and dark matter experiments are based on liquid argon detectors. Since liquid argon is also a very effective scintillator, these experiments also have light detection systems. 127 nm wavelength of the liquid argon scintillation leads to the development of specialized light detectors, mostly based on wavelength shifters, and recently photodetectors sensitive to deeper UV. The effective calibration and quality control of these newly developed detectors is still a persisting problem. In order to respond to this need, we developed an argon light source which is based on plasma generation and light transfer across a MgF2 window. The light source is designed as a small, portable and easy to operate device to enable the acquisition of performance characteristics of several square meters of light detectors at once. Here we report on the development of the light source and its preliminary performance characteristics.
Development of an Argon Light Source as a Calibration and Quality Control Device for Liquid Argon Light Detectors
(MDPI, 2022) Tosun, Mehmet; Bilki, Burak; vd.
The majority of future large-scale neutrino and dark matter experiments are based on liquid argon detectors. Since liquid argon is also a very effective scintillator, these experiments also have light detection systems. The liquid argon scintillation wavelength of 127 nm is most commonly shifted to the visible range by special wavelength shifters or read out by the 127 nm sensitive photodetectors that are under development. The effective calibration and quality control of these active media is still a persisting problem. In order to respond to this need, we developed an argon light source which is based on plasma generation and light transfer across a MgF2 window. The light source was designed as a small, portable and easy-to-operate device to enable the acquisition of performance characteristics of several square meters of light detectors. Here, we report on the development of the light source and its performance characteristics.
Design, construction and operation of the ProtoDUNE-SP Liquid Argon TPC
(IOP Publishing Ltd, 2022) Bilki, Burak; vd.
The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber (LArTPC) that was constructed and operated in the CERN North Area at the end of the H4 beamline. This detector is a prototype for the first far detector module of the Deep Underground Neutrino Experiment (DUNE), which will be constructed at the Sandford Underground Research Facility (SURF) in Lead, South Dakota, U.S.A. The ProtoDUNE-SP detector incorporates full-size components as designed for DUNE and has an active volume of 7 × 6 × 7.2 m3 . The H4 beam delivers incident particles with well-measured momenta and high-purity particle identification. ProtoDUNE-SP’s successful operation between 2018 and 2020 demonstrates the effectiveness of the single-phase far detector design. This paper describes the design, construction, assembly and operation of the detector components.

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