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Çok eşlilik kurumunun Türk Medeni Hukuku çerçevesinde değerlendirilmesi
No full text743 sayılı Türk Medeni Kanunu ile birlikte Türk medeni hukukunda yasak- lanmış olan çok eşlilikle, bu Kanun’un yürürlüğe girmesinden günümüze neredeyse yüz yıl geçmiş olmasına rağmen hâlâ karşılaşılabilmektedir. 864 sayılı Kanun m.9 gereğin- ce, 743 sayılı Türk Medeni Kanunu öncesi gerçekleşmiş olan çok eşli evlilikler geçerliliğini korumaya devam etmiştir. Ancak aradan geçen uzun süren nedeniyle bu evliliklerin günümüzde devam ediyor olması oldukça zordur. Diğer taraftan 4721 sayılı TMK m.130’daki evlenme engeline rağmen çok eşli evlilikler gerçekleşebilmektedir. 4721 sayılı TMK m.145/b.1’in eşlerden herhangi birinin evlilik esnasında evli olmasını mut- lak butlan sebebi olarak kabul etmesi m.130’a rağmen çok eşlilikle karşılaşılabileceğine işaret etmektedir. Ayrıca bazı ülkelerin hukuk düzenleri çok eşli evliliklere belirli şartların varlığı durumunda müsaade etmektedir. Söz konusu ülkelerden herhangi birinin vatandaşı iken geçerli şekilde birden fazla kişiyle evlenmiş olan bir kimse, sonradan Türk vatandaşlığını kazanabilmektedir. Bu durumda, Türk vatandaşlığını sonradan kazananların çok eşliliği gündeme gelebilmektedir.No sponso
Folic acid as a potential vitamin in glycemic control: a systematic review
No full textPurpose This systematic review aims to examine the relationship between serum folate level and folic acid supplements with glycemic control parameters (fasting blood glucose (FBG), insulin level, Homeostatic Model Assessment for Insulin Resistance (HOMA-IR), and Hemoglobin A1C (HbA1c)) in adult individuals with current studies. Methods In this study, which was designed as a systematic review, the searches were performed on Web of Science, Science
Direct, Medline, Wiley, and Cochrane Library databases between April 10, 2023, and May 10, 2023, and the searches were updated between October 16, 2023, and November 14, 2023. Of the 1855 studies obtained from the screening, 17 met the criteria and were included in the systematic review. The PROSPERO system registered the study protocol (ID: CRD42023472434). Recent Findings Although no signifcant correlation was found between serum folate levels and glycemic control parameters in most of the cross-sectional studies included in this systematic review, most of the randomized controlled trials showed
that glycemic control parameters (FBG, insulin, HOMA-IR) decreased signifcantly in the intervention group receiving folic acid supplementation compared to the control group. However, study durations were short, and HbA1c needed to be evaluated in most studies. This makes it difcult to get information about the long-term efects of folic acid supplementation. Summary More comprehensive studies should be conducted to draw more precise conclusions about the relationship between folic acid levels and folic acid supplementation with glycemic control parameters.No sponso
Impact of Covid-19 pandemic on tourism research : a bibliometric analysis using cite space
No full textThis research aims to review the extant literature on Covid-19 using bibliometric analysis in an attempt to gauge the evolving state of tourism research since the beginning of the Covid-19 pandemic. The Thompson Reuters’ Web of Science Core Collection database was chosen to collect the bibliographic data of 3179 publications for the period of 2020- February 2022. CiteSpace software was then employed to analyze and visualize the documents. Co-citation analysis and co-occurrence of keywords were carried out in terms of bibliometric analysis. The findings revealed a significant increase in the diversity of topics and subtopics addressed by researchers regarding Covid-19. This bibliometric review provides a comprehensive and objective review of Covid-19 related publications in the tourism field. It extends previous reviews by visualizing the underlying structure via CiteSpace software and adding current publications. Furthermore, this study may help researchers better evaluate and monitor research trends in tourism during the Covid-19 pandemic.No sponso
The global dynamics of conventional cancer tumor growth model
No full textInternational Zeugma Congress on Scientific Research (12. : 2024 : Gaziantep, Turkiye)We present here, a phase-space analysis of a mathematical model of tumor growth with an immune responses. Consider mathematical analysis of the system of nonlocal equations regarding to dissipativity, boundedness of solutions, invariance of non-negativity, local and global stability and the
basins of attractions. In conventional models of population dynamics, consumption of resources by the individuals occurs at the same spatial location as reproduction and death. We assume in this work that the individual located at a point in the spatial domain can consume resources not only at that point but also at some neighboring region surrounding that point. Movement of the individuals to the nearby location occurs in a faster time scale compared to the movement from one location to the other one. This modifies the modeling approach and gives rise to a nonlocal differential equation with convolution terms describing the nonlocal consumption of resources. Such type reaction-diffusion equations with the nonlocal term is
also used to explain the emergence and evolution of biological species and speciation were studied. We derive some features of behavior of the three-dimensional tumor growth models with nonlocal dynamics
described in terms of densities of three cells populations: tumor cells, healthy host cells and effector immune cells. We found sufficient conditions, under which trajectories from the positive domain of feasible multipoint initial conditions tend to one of equilibrium points. Here, cases of the small tumor
mass equilibria-the healthy equilibrium point, the "death" equilibria have been examined. Biological implications of our results are discussed.No sponso
Enhancing human resource management in the aviation sector: A comprehensive analysis
No full textThis study is highlighting the importance of human resources management in managing employment growth accompanying the expansion of the aviation sector in both Türkiye and worldwide and then in-depth examination of the human resources department within a multinational company operating in the aviation sector in Antalya. Initially, it conducts a comprehensive analysis of the department's overall performance, followed by a detailed exploration of the job descriptions of its employees. Utilizing diverse analysis methods, the HR department's performance is meticulously evaluated, juxtaposed against both operational benchmarks and international standards. The findings of these analyses, along with comparative assessments, are synthesized in a project with a title "Current Situation Analysis," which offers an insightful overview of the department's present state. Additionally, the study delves into the implementation of recommendations derived from the analysis, assessing their integration within the company. By scrutinizing these implementations, the study aims to provide a holistic understanding of the HR department's performance and its alignment with organizational objectives. Through this thorough investigation, the study endeavors to offer valuable insights into enhancing the efficacy and efficiency of the human resources department within the context of the aviation industry.No sponso
Farklı saflaştırma aşamalarına tabi tutulan sulu ve etanolik stevia ekstraktlarının fenolik asit profilindeki değişimler
No full textStevia extracts are valued for their health benefits, primarily due to the phenolic acids they
contain, which contribute to the antioxidant properties of stevia. This study investigated the
alterations in the phenolic acid composition of aqueous and ethanolic stevia extracts across
several purification stages. Accordingly, dried stevia leaves were mixed with distilled water or
ethanol, centrifuged, filtered, clarified at 50°C with aids, and then passed through stepwise
membrane filtration using 30 kDa ultrafiltration and 5 kDa nanofiltration membranes. The
phenolic acid composition was analyzed by extracting samples with a 75% methanol and
formic acid solution, followed by centrifugation. Detection was performed using an LCMS/
MS device equipped with a C18 column. Chlorogenic acid was the most prevalent in both
aqueous and ethanolic stevia extracts. However, the ethanolic extract exhibited a higher
concentration (approx. 600 mg/kg) compared to the aqueous extract (approx. 100 mg/kg). After
centrifugation and clarification, the phenolic acid concentrations in both extracts significantly
decreased. The 30 kDa retentate phase was crucial for the enrichment of chlorogenic and
caffeic acids. The aqueous extract reached approximately 120 mg/kg chlorogenic acid, while
the ethanolic extract reached about 400 mg/kg. Nanofiltration phases (5 kDa permeate and
retentate) significantly reduced the levels of these acids. Other phenolic acids, such as luteolin,
apigenin, and rutin, remained at low levels throughout all phases. The solvent used had a
significant impact on the phenolic profile, with ethanol being more effective in retaining
chlorogenic acid. While the 30 kDa retentate phase concentrated phenolic acids, the type of
solvent used played a key role in shaping the overall profile.No sponso
Challenges in power scaling of Cr:LiCAF lasers: effect of passive losses
No full textIn this work, we have investigated the continuous-wave (cw) lasing potential of thin slab-shaped Cr:LiCAF crystals
with a low chromium doping level of around 1% and various lengths of 1 to 2 cm. These relatively long crystals
with low Cr-doping facilitate the distribution of heat load in a larger volume and could enable power scaling of
Cr:LiCAF lasers. However, long crystals tend to have larger passive losses, and it is also more challenging to achieve
efficient mode-matching to the low-brightness pump mode in a longer gain element, which could hinder laser
performance. To explore the issue, we have performed detailed cw lasing experiments in single- and multimode
diode-pumped Cr:LiCAF laser systems employing crystals with different doping and length. Our results showed
that current state-of-the-art crystal growth methods provide Cr:LiCAF crystals with low enough passive losses
to enable cw laser efficiencies of up to 50%, even in these long samples. The pump powers available in this study
(5.35 W) limited the cw powers we could achieve experimentally to 2.25 W level; however, our simulations indicate
that thin slab-type Cr:LiCAF crystals with low Cr-doping have the potential to achieve cw powers above 10 W
level.No sponso
GHz SESAM-modelocked femtosecond Yb:YLF laser
No full textWe report the first GHz Yb:YLF laser generating 210 fs long pulses at 40 mW average power output from a low-cost, self-starting, single-mode diode pumped cavity with integrated relative intensity noise <0.45%.No sponso
Assessment of neutron and gamma-ray shielding characteristics in ternary composites: experimental analysis and Monte Carlo simulations
No full textThe research aims to exploring the gamma-ray shielding capacities of polyacrylonitrile/chrome-filled polymer composites through a combination of experimental, theoretical and simulation methods. Additionally, employing MCNPv6 and GEANT4 simulation tools, the study evaluates the materials' performance against neutron radiation. The materials were subjected to various gamma-ray energy levels, and their shielding efficacies are analytically quantified using parameters such as Radiation Protection Efficiency (RPE), Mass Attenuation Coefficient (MAC), Linear Attenuation Coefficient (LAC), and Half-Value Layer (HVL). At various neutron energies and sample thicknesses, the numbers of transmitted neutrons were evaluated. Notably, composite P0Cr50 (not contain polyacrylonitrile and containing 50% chromium) emerges prominently, demonstrating superior radiation shielding characteristics against both gamma and neutron radiations. This attitude is attributed to its optimal chrome dispersion and density, positioning it as a promising candidate for radiation shielding applications in industrial and nuclear domains.No sponso
The changing role of hotel attributes in destination competitiveness throughout a crisis
No full textPurpose-By conducting a longitudinal study, this study aims to investigate how the role of hotel attributes in destination competitiveness changed through the stages of pre-, amid and recovery from the crisis.
Design/methodology/approach-First, the latent Dirichlet allocation method was used to identify hotel attributes from 15,137 online reviews, and then a sentiment analysis was performed to determine tourist satisfaction with the subject attributes. Second, separate asymmetric impact competitor analyses were conducted for the three stages of the crisis, and their results were compared with understand how the role of the hotel attributes changed throughout the crisis.
Findings-The results revealed that the impacts of hotel attributes on tourist satisfaction and destination competitiveness differed significantly at each stage of the crisis.
Research limitations/implications-This research expands the existing literature by offering valuable insights by elucidating the changing characteristics of hotel attributes at each crisis stage. The results extend the body of knowledge in destination management by providing evidence on the validity of asymmetric impact competitor analysis.
Originality/value-To fully understand the impact of a crisis (e.g. COVID-19) on destination competitiveness with a focus on the hotel sector, this research conducted a longitudinal study that covers three stages of the crisis (i.e. pre-, amid and post-crisis). Moreover, unlike previous studies, this research considers the asymmetric relationships between service attributes and overall tourist satisfaction, as well as competitors’ information.No sponso