İstanbul Gelişim Üniversitesi Kurumsal Açık Erişim Arşivi
DSpace@Gelişim, İstanbul Gelişim Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Design and Thermodynamic Analysis of Waste Heat-Driven Liquid Metal–Water Binary Vapor Power Plant Onboard Ship
(MDPI, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND, 2024) Kepekçi, Haydar İzzettin; Ezgi, Cüneyt
Day after day, stricter environmental regulations and rising operating costs and fuel prices
are forcing the shipping industry to find more effective ways of designing and operating energyefficient ships. One of the ways to produce electricity efficiently is to create a waste heat-driven liquid
metal–water binary vapor power plant. The liquid metal Rankine cycle systems could be considered
topping cycles. Liquid metal binary cycles share characteristics like those of the steam Rankine power
plants. They have the potential for high conversion efficiency, they will likely produce lower-cost
power in plants of large capacity rather than small, and they will operate more efficiently at design
capacity rather than at partial load. As a result, liquid metal topping cycles may find application
primarily as base-load plants onboard ships. In this study, a waste heat-driven liquid metal–water
binary vapor power plant onboard a ship is designed and thermodynamically analyzed. The waste
heat onboard the vessel is the exhaust gas of the LM2500 marine gas turbine. Mercury and Cesium
are selected as liquid metals in the topping cycle, while water is used in the bottoming cycle in binary
power plants. Engineering Equation Solver (EES) software (V11.898) is used to perform analyses.
For the turbine inlet temperature of 550 ◦C, while the total net work output of the binary cycle
system is calculated to be 104.84 kJ/kg liquid metal and 1740.29 kJ/kg liquid metal for mercury and
cesium, respectively, the efficiency of the binary cycle system is calculated to be 31.9% and 26.3%
for mercury and cesium as liquid metal, respectively. This study shows that the binary cycle has a
thermal efficiency of 26.32% and 31.91% for cesium and mercury, respectively, depending on liquid
metal condensing pressure, and a binary cycle thermal efficiency of 25.9% and 30.9% for cesium and
mercury, respectively, depending on liquid metal turbine inlet temperature, and these are possible
with marine engine waste heat-driven liquid metal–water binary vapor cycles.
Thermodynamic Analysis of Marine Diesel Engine Exhaust Heat-Driven Organic and Inorganic Rankine Cycle Onboard Ships
(MDPI, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND, 2024) Ezgi, Cüneyt; Kepekçi, Haydar İzzettin
Due to increasing emissions and global warming, in parallel with the increasing world
population and energy needs, IMO has introduced severe rules for ships. Energy efficiency on
ships can be achieved using the organic and inorganic Rankine cycle (RC) driven by exhaust heat
from marine diesel engines. In this study, toluene, R600, isopentane, and n-hexane as dry fluids;
R717 and R718 as wet fluids; and R123, R142b, R600a, R245fa, and R141b as isentropic fluids are
selected as the working fluid because they are commonly used refrigerants, with favorable thermal
properties, zero ODP, low GWP and are good contenders for this application. The cycle and exergy
efficiencies, net power, and irreversibility of marine diesel engine exhaust-driven simple RC and
RC with a recuperator are calculated. For dry fluids, the most efficient fluid at low turbine inlet
temperatures is n-hexane at 39.75%, while at high turbine inlet temperatures, it is toluene at 41.20%.
For isentropic fluids, the most efficient fluid at low turbine inlet temperatures is R123 with 23%,
while at high turbine inlet temperatures it is R141b with 23%. As an inorganic fluid, R718 is one of
the most suitable working fluids at high turbine inlet temperatures of 300 ◦C onboard ships with a
safety group classification of A1, ODP of 0, and GWP100 of 0, with a cycle efficiency of 33%. This
study contributes to significant improvements in fuel efficiency and reductions in greenhouse gas
emissions, leading to more sustainable and cost-effective maritime operations.
Could DTI Unlock the Mystery of Subjective Tinnitus: It’s Time for Parameters That Go A Little Out of the Routine
(SPRINGER INDIA, 7TH FLOOR, VIJAYA BUILDING, 17, BARAKHAMBA ROAD, NEW DELHI 110 001, INDIA, 2024) Yılmaz, Eren; Yıldırım, Düzgün; Şanlı, Deniz Esin Tekcan; Elpen, Pınar; Gösterişli Tüzüner, Filiz; İnan, Neslihan Gökmen; Şirin, Ahmet; Yağımlı, Mustafa; Tozan, Hakan; Şanlı, Ahmet Necati; Kandemirli, Sedat Giray
In this study, it was aimed to assess the microstructural changes in the main central auditory pathway in cases with subjective tinnitus. In total, 101 subjects (52 cases with bilateral subjective non-pulsatile tinnitus and 49 healthy cases as the
control group) were included in the study. Participants underwent pure tone audiogram and Diffusion Tensor ImagingMagnetic Resonance Imaging (DTI-MRI) examination with a 3 Tesla MRI device. The number of tracts, tract length,
volume, and quantitative anisotropy (QA) and normalized quantitative anisotropy’ (nQA) values were calculated by plotting cochleocortical pathways from the cochlear nerve to ipsilateral and contralateral Heschl’s gyrus (HG). In pure tone
audiometry, the control group had lower hearing thresholds than cases with tinnitus. Fibres and nQA values from the right
cochlear nerve to the right HG were significantly lower in the tinnitus group than in the control group. Cochlear nuclei
voxel counts were significantly decreased in the tinnitus group. Both cochlear nucleus volumes were higher in the tinnitus group than in the control group. nQA values in both cochlear nuclei were decreased in the tinnitus group. This study
showed that the most commonly affected part in subjective non-pulsatile tinnitus cases is the cochlear nucleus. Therefore,
the cochlear nucleus should be evaluated more carefully in cases presenting with subjective tinnitus.
The Impact of Artificial Intelligence Applications on Digital Banking in Turkish Banking Industry
(HINDAWI LTD, ADAM HOUSE, 3RD FLR, 1 FITZROY SQ, LONDON W1T 5HF, ENGLAND, 2024) Demirel, Serkan; Topçu, Murat
Tis paper presents the efects of chat box (C.B.) and video call (V.C.) artifcial intelligence applications, which are becoming
increasingly common in the banking system in parallel with the development of information systems on the number of digital
banking users, and the relationship between the variables is investigated. Te data set of the variables consists of a total of 44
observation points between the 1st quarter of 2012 and the 4th quarter of 2022. Te cointegration relationship between the
variables is examined using the ARDL cointegration test. According to the F statistic results for cointegration hypothesis testing,
there is a statistically signifcant relationship between the variables at a 1% signifcance level. In the long run, a 1% increase in Chat
Box users causes an increase of approximately 0.2% in the number of mobile banking users. A 1% increase in Chat Box users in the
short term increases the number of mobile banking users in the current period by approximately 0.03%. A 1% increase in video call
users in the long term causes an increase of approximately 0.04% in the number of mobile banking users. A 1% increase in the
number of video calls in the current period increases current period mobile banking applications by approximately 0.005%. It has
been determined that the efect of chat box applications on mobile banking is higher than that of video call applications. In
addition, there is a close correlation between mobile banking and the independent variable chat box, no correlation between
mobile banking and video calling, and a moderate correlation between chat box and video calling. All fndings mean that artifcial
intelligence applications positively contribute to the expansion of mobile banking.
Assessing the protective effects of chard on valproic acid-induced pancreatic complications
(NATL INST SCIENCE COMMUNICATION-NISCAIR, DR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIA, 2024) Alev Tüzüner, Burçin; Ak, Esin; Tunalı, Sevim; İpekci, Hazal; Üstundağ, Ünsal Veli; Tunalı Akbay, Tuğba; Emekli Alturfan, Ebru; Çetinel, Şule; Yanardağ, Refiye; Yarat, Ayşen; Ahmad, Sarfraz
Valproic acid (VPA) treatment is known to potentially cause adverse effects, notably as the most common cause of druginduced acute pancreatitis. It is crucial to balance the therapeutic benefits and potential major side effects of VPA
administration. Complications associated with VPA may arise from toxic VPA metabolites and alterations in antioxidant
levels. While chard is well-known for its anti-hyperglycemic and antioxidant properties, there is a lack of research on its
impact on the pancreas during VPA treatment. This study aimed to explore the possible protective effects of chard against
VPA-induced complications in the pancreas using histological and biochemical approaches. Animals were separated into
four groups: i) Control, ii) received chard (100 mg/kg), iii) received VPA (500 mg/kg), and iv) received VPA+Chard
(in the same dosages and time). On the eighth day, the rats’ pancreatic tissue and blood specimens were collected. In the
Chard and VPA+Chard groups, chard decreased blood glucose levels compared to the control and VPA groups. In
comparison to the VPA group, the VPA+Chard group pancreatic glutathione level and catalase activity increased whereas
malondialdehyde levels decreased. Furthermore, administration of chard to the control and VPA groups increased tissue
factor activity and sialic acid level as compared to the VPA group. The histological findings confirmed the biochemical
results. It is therefore concluded that chard has the potential to protect pancreatic tissue from VPA-induced complications by
reducing lipid peroxidation and blood glucose while enhancing antioxidants and sialic acid levels.
