Siirt Üniversitesi Kurumsal Akademik Arşivi
DSpace@Siirt, Siirt 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
Innovative drought analysis via groundwater information
(Elsevier BV, 2025-09) Veysi Kartal
Drought hazard has complicated features related to climatic and spatio-temporal characteristics, making it challenging to accurately identify and track. Contemporary approaches to drought monitoring generally use standardized drought indices due to their practical utility. Despite the availability of a various array of drought indices, their application introduces complexities in data mining and decision-making processes, potentially resulting in confused outcomes. However, this research developed a new hybrid drought index Multivariate Cluster Ensemble Drought Evaluation Index (MCEDEI) based on machine learning technique cluster analysis using groundwater data of the KB region of Türkiye to assess the groundwater drought. For the development of MCEDEI, this study used 540-time series observations (range: 1978–2022) of groundwater data from five stations to evaluate drought characteristics. Furthermore, this study used steady-state probability to determine the trend and long-term probabilities of the drought index in the KB region of Türkiye. The results show that the NN (near normal) class was found to be dominant with a probability of 70.41% on a 1-month time scale, while NN was found to be dominant with a high probability of 65.94% on a 3-month time scale. The probability of the NN class was found to be equally high when the time scale was extended to 6, 9 and even 48 months. MD (moderate drought) remains important, and SD (severe drought) increases compared to SW (severe wet) classes. Findings shpw that there are significant changes in groundwater behaviour at different time scales. Short-term stability is characterized by the dominance of the NN class, while long-term scales show a trend towards extreme dry and wet conditions with a decrease in neutrality. As a result, Türkiye may face drought challenges in the future based on the findings.
Analytical dynamics to the interactions of a diffusive mussel–algae model
(Elsevier BV, 2025-06) Muhammad Jawaz; Muhammad Shahzad; Nauman Ahmed; Muhammad Zafarullah Baber; Muhammad Iqbal; Ali Akgül
This paper examines the diffusive mussel–algae model and explores soliton solutions and wave structures using advanced analytical techniques, particularly the new auxiliary equation method. The proposed method reveals a variety of solution types, including hyperbolic, parabolic, and mixed forms. These closed-form results provide the nature of the current problem. These solutions are validated against known results and numerical simulations. Additionally, we describe two-dimensional and three-dimensional graphical representations of the solutions, illustrating their spatial and temporal dynamics. This study enhances the theoretical understanding of mussel algae interactions and offers practical insights for eco-logical management, showcasing the contributions of the approach to resolving complex ecological dynamics
Evaluation of Subclinical Left Ventricular Dysfunction in HIV Patients Receiving Abacavir, Dolutegravir, and Lamivudine Therapy with Novel Tissue Doppler Imaging Techniques
(MDPI AG, 2025-02-25) Dogac Oksen; Muzaffer Aslan; Ebru Serin; Muhammed Heja Gecit; Yunus Emre Yavuz; Esra Yerlikaya Zerdali; Veysel Oktay
Background/Objectives: Highly active antiretroviral therapy (HAART) effectively suppresses viral load and aids immunological recovery in HIV patients, but may still lead to subclinical myocardial dysfunction. This study assesses left and right ventricular functions in patients on HAART containing abacavir, dolutegravir, and lamivudine using Tissue Doppler Imaging (TDI). Methods: This observational cross-sectional study involved 118 HIV-positive adults on HAART and 80 age- and gender-matched healthy controls. Comprehensive echocardiographic assessments, including TDI, were conducted to evaluate myocardial performance index (MPI) and isovolumic acceleration (IVA). Results: Conventional echocardiographic parameters showed no significant differences; however, TDI indicated significant impairments in ventricular functions in the HAART group, with increased MPI and decreased IVA (p < 0.001). Pulmonary artery pressures were also higher in the HIV group (p = 0.012). There was a strong positive correlation between MPI and HAART duration (r = 0.675, p = 0.002), and a negative correlation with CD4 count (r = −0.545, p = 0.006). Conclusions: TDI reveals significant subclinical ventricular dysfunction in HIV patients on HAART, correlating with therapy duration and immune status. These findings underscore the utility of TDI in detecting myocardial deterioration before clinical symptoms appear.
Treatment of nonunion cases with linear external fixation in cats: 10 cases (2022–2023)
(American Veterinary Medical Association (AVMA), 2025-03-01) Ali Gülaydin
Objective This study aimed to evaluate the clinical and radiologic findings in the treatment of live oligotrophic and pseudoarthrosis nonunions in cats using a linear external fixator. Methods The study included 10 cats of various breeds, ages, and sexes that had previously undergone osteosynthesis at another clinic but did not achieve successful results. These cats were diagnosed with nonunion based on clinical and radiographic examinations conducted at the Clinic of the Surgery Department, Siirt University Animal Health Practice and Research Hospital between 2022 and 2023. All included cats presented with clinical and radiographic signs of nonunion fractures. The fractures were categorized as oligotrophic or pseudoarthrosis types of nonunion, requiring further surgical intervention. Results All 10 cats recovered successfully without severe complications. Bone healing was completed within an average of 57.8 days, ranging from 47 to 71 days. Conclusions This study highlights the effectiveness of linear external fixation in treating nonunion fractures in cats. The method demonstrated a high success rate, with all cases recovering fully. Clinical Relevance Tailoring the treatment to the animal’s size, fracture location, and nonunion classification makes this approach a valuable clinical tool for veterinarians managing such cases.
Forecasting monthly rainfall and temperature patterns in Van Province, Türkiye, using ARIMA and SARIMA models: a long-term climate analysis
(IWA Publishing, 2025-02-01) Veysel Süleyman Yavuz
This study investigates monthly rainfall and temperature trends in Van Province, Türkiye, using ARIMA and SARIMA models, with a dataset spanning from 1955 to 2023. The ARIMA(3,1,0) model for rainfall and ARIMA(0,1,1) model for temperature were selected based on Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) values, achieving AIC scores of 788.224 and 172.077, respectively. To address seasonality, SARIMA models were also applied, with SARIMA(3,1,0)(2,1,0)[12] for rainfall and SARIMA(0,1,1)(2,1,0)[12] for temperature, yielding AIC scores of 672.061 and 163.669. Diagnostic tests, including the Ljung–Box and Jarque–Bera tests, confirmed model adequacy by indicating minimal autocorrelation and normal residual distributions. These models successfully captured seasonal and longterm patterns, offering valuable insights for regional planning in water resource management and agriculture. The study underscores the potential of ARIMA and SARIMA models for climate forecasting, with suggestions for future enhancements using hybrid approaches to improve predictions under non-linear conditions.
