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Effect of curvature angle and structural configurations on dynamic performance of honeycomb sandwich structures
No full textThe aim of this study is to investigate the effects of curve angle and structural parameters on ballistic performance of honeycomb sandwich structures. In the study, high-velocity impact simulations were performed in LS DYNA finite element program to investigate the effects of honeycomb structural parameters, curve angle, residual velocity, specific energy absorption (SEA) and damage mechanism. Progressive damage analysis based on the combination of cohesive zone model (CZM) and bilinear traction-separation law was performed. The ballistic limit value increased by 41.9% when the facesheet thickness increased by two times. When the cell wall thickness increased by five times, the ballistic limit value increased by 13.3%. When the core height was two times increased, the ballistic limit velocity value increased by 2.076 times. Although the ballistic limit velocity value of the CFRP Facesheet and Aluminum (Al) core sandwich structure is 7.14% lower than the all Al specimen, the SEA value is 9.47% higher. When the curve angle increases from 0 & ring; to 180 & ring;, the ballistic limit value decreases by 22.8%. In general, this study provides useful information about the design of ballistic structures, parameters affecting their performance and their effects
Composite Formation of Active Biochar from Pomegranate Peel with Magnetite and Alginat Beads for Methylene Blue Adsorption Using Box-Behnken Design
No full textThe aim of this study was to develop an innovative material by combining the properties of magnetic biochar derived from orange peels and hydrogel beads (BCA-Mag/AB) and to apply this material for the adsorption of methylene blue dye in water. The BCA-Mag/AB were synthesized using physical crosslinking methods and was characterized using various techniques. The surface functional groups were analyzed using FTIR, the crystal structure was examined through XRD, the surface area was determined by BET, the pore distribution was assessed via BJH, thermal stability was evaluated with TGA, surface morphology was investigated using SEM, and the surface element percentages were analyzed with EDX. The specific surface area obtained through nitrogen adsorption was found to be 455.4 m2/g, and the total pore volume was 0.268 cm3/g. The removal of methylene blue dye on BCA-Mag/AB was investigated concerning three variables using Box-Behnken Design (BBD) as follows: A: BCA-Mag/AB dosage (0.02-0.1 g); B: contact time (20-150 min); and C: initial pH (2-10). Adsorption kinetic and isotherm analyses indicated that the adsorption of methylene blue onto BCA-Mag/AB was governed by pseudo-first-order and Freundlich models. The adsorption mechanisms of methylene blue on the BCA-Mag/AB surface were associated with electrostatic interaction, hydrophobic interaction, and pi-pi stacking. The results suggest that BCA-Mag/AB could be an effective and locally available candidate adsorbent for the removal of dye pollutants from contaminated industrial wastewater.Mus Alparslan University Scientific Research Coordination Unit; [BAP-24-FEF-4901-01]This study was supported by Mus Alparslan University Scientific Research Coordination Unit, project number BAP-24-FEF-4901-01
Mediating role of psychological well-being in the effect of spirituality on attitudes toward death in the elderly
No full textBackground: Spirituality and psychological well-being are important in shaping attitudes toward death. Objective: This study was conducted to determine the mediating role of psychological well-being in the effect of spirituality on attitudes toward death in the elderly. Method: This cross-sectional descriptive study was conducted in a province of Turkey between February 2024 and June 2024 with 467 individuals aged 65 years and older. The variables affecting attitudes toward death were identified by conducting mediation analysis and predictive analysis with a machine learning approach. Data were analyzed using SPSS 22.0, G*Power 3.1, R programming language 4.1.3 programs. Results: In our study, the effect of spirituality on psychological well-being was found to be positive and statistically significant (coefficient = 0.660, P < 0.001). The direct effect of spirituality on neutrality and approaching acceptance, sub-dimensions of attitude toward death, was significant (coefficient = 1.603, P < 0.001), and its indirect effect through psychological well-being was also significant (coefficient = 0.179, lower limit confidence interval (LLCI) = 0.085, upper limit CI (ULCI) = 0.309). The direct effect of spirituality on escape acceptance (coefficient = 0.571, P < 0.001), one of the attitudes toward death sub-dimensions, was significant, but the mediation effect of psychological well-being was not significant (LLCI = −0.049, ULCI = 0.0438). The direct effect of spirituality on fear and avoidance of death, one of the attitudes toward death sub-dimensions, was not statistically significant at the 95% confidence level (coefficient = 0.094, P = 0.433). The indirect effect of psychological well-being on fear and avoidance of death was negative and significant (coefficient = −0.136, LLCI = −0.233, ULCI = −0.031). Conclusion: In this study, as spirituality increases, attitudes toward death also increase positively. It was found that as spirituality increases, people tend to have a more positive acceptance and approach toward death. This study suggests that spirituality may influence emotional responses to death and shape attitudes toward death, particularly neutral acceptance and escape acceptance. As psychological well-being increases in the elderly, acceptance of death increases and fear of death decreases. In the study, prediction with different machine learning approaches is proposed. Longitudinal studies on attitudes toward death are recommended. © 2025 Japanese Psychogeriatric Society
Investigation of the Effect of Harmonics Caused by Transformer-Induced Nonlinear Loads on Electrical Energy
Full text linkIn this study, distribution transformers in the Mugs Alparslan University campus are analyzed in order to minimize energy losses due to harmonics in the electrical network. Current and voltage harmonics, which are the power quality problems of these transformers, are analyzed. The power quality of different transformers in Mugs Alparslan University was measured with a Chauvin Arnoux CA:8331 energy analyzer. Three-phase nonlinear load models were created using current harmonic values in the Matlab/Simulink environment. A parallel active power filter is designed in the Matlab/Simulink environment to eliminate current harmonics. The performance of the parallel active power filter is analyzed for each transformer. As a result, the total harmonic distortion (THDI) ratio for the current decreased from 6.78% to 1.38% in fast Fourier transform analyses after the parallel active power filter was activated in the first transformer. Similarly, the THDI ratio decreased from 5.1% to 2.19% in the second transformer, from 4.5% to 1.39% in the third transformer, and from 5.63% to 1.36% in the fourth transformer
The Development of Violence Research in Psychiatric Nursing: A Bibliometric Perspective
Full text linkBackgroundThere is a growing emphasis on violence-related research in psychiatric nursing, with an annual increase rate of 2.12% in publications and the highest number of publications occurring in 2024. This trend underscores the escalating importance of addressing violence in mental health settings.AimThis study aims to demonstrate the quantitative and qualitative features of violence publications in the field of psychiatric nursing from a bibliometric perspective. Web of Science was used during the research.MethodsThis study employed bibliometric analysis, a methodological approach for delineating the scope of information and assessing productivity within a specific domain. The data were searched with the keyword combination 'violence and psychiatric nursing', including studies published until December 2024, the study date, without a time limit.ResultsIn this study, 464 violence research/reviews in the field of nursing were identified between 2001 and 2025, and the research was completed with 438 violence studies in line with the exclusion criteria. 1493 authors wrote 390 research and 48 review/systematic review articles, with an average of 22.14 citations for each publication. Most were published in 2024.DiscussionThere is an apparent increase in the involvement of psychiatric nurses in studies pertaining to violence. It is proposed that nursing professionals should undertake further research to investigate violence processes and develop ethically sound approaches to patients and healthy individuals, taking into account biopsychosocial factors.Implications for PracticeThese findings collectively suggest that while progress is being made in understanding and addressing violence in psychiatric nursing, there remains a critical need for ongoing research, policy development and practical interventions to ensure the safety and well-being of both nurses and patients in mental health settings
Ionospheric response to the 2004 Sumatra-Andaman earthquake: evaluation of a novel histogram-based metric
No full textIn this study, we investigated the effectiveness of a new metric for determining ionospheric perturbations before and on the day of the 26 December 2004 Sumatra-Andaman earthquake (EQ), the longest EQ recorded in modern history. For this purpose, we used the SlantTotal Electron Content (TEC) (STEC) values from the SAMP station, the closest International GNSS System (IGS) station to the epicenter. The trend was estimated using the Least Squares Polynomial Fitting (LSPF) method, and the residual time series were transformed into histogram vectors. Additionally, the Sliding Window Interquartile Range (SW-IQR) method was applied to better characterize local TEC anomalies. A new metric (M-metric) based on these histogram vectors was proposed. EQ-related ionospheric anomalies were compared using both metrics for the same Pseudo Random Noise (PRNs) on the day of the EQ and one day before. With the M-metric, significant perturbations were detected on the EQ day, following the EQ time, at PRN-13 and PRN-23, in line with the literature. According to the Differential Rate of TEC (DROT) method, medium-scale traveling ionospheric disturbances (TID) were observed at PRN-3 and PRN-23 on the EQ day, while large-scale TID (LSTID) were detected at PRN-11, PRN-13, and PRN-20. One day before the EQ, LSTID occurred at PRN-11 and middle-scale TID (MSTID) occurred at PRN-20. However, as noted in the literature, no significant perturbation was observed on either the day of the EQ or the day before, especially at PRN-11. In conclusion, the new metric, in combination with SW-IQR, successfully detected ionospheric perturbations from this EQ, demonstrating improved (c) 2025 COSPAR. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies
MULTIPLICATIVE ORDER CONTINUOUS OPERATORS ON RIESZ ALGEBRAS
Full text linkIn this paper, we investigate operators on Riesz algebras, which are continuous with respect to multiplicative modifications of order convergence and relatively uniform convergence. We also introduce and study mo-Lebesgue, mo-KB, and mo-Levi operators.State Task to the Sobolev Institute of Mathematics [FWNF2022-0004]. The research of the second author was carried out in the framework of the State Task to the Sobolev Institute of Mathematics (Project FWNF-2022-0004)
When death is a wedding night: a comparison of Sufi, mainstream Muslim, and atheist reactions to mortality salience
Full text linkThe primary purpose of this study was to test the main claims of terror management theory through an alternative cultural worldview by focusing on Sufism, in which death is seen as a desired state for meeting God (Vuslat). Sufism is a mystical and spiritual dimension of Islam, emphasizing the inner search for a direct experience of the Divine through practices such as meditation, devotion, and worship. For this purpose, data were collected from a total of 181 participants, 60 of whom were mainstream Muslims, 60 of whom were atheists, and 61 of whom were Sufis. According to the results of a 2 (condition: mortality salience [MS] vs. dental pain) x 3 (groups: mainstream Muslim, Sufi, atheist) between-subject ANCOVA, MS led to an increase in the level of worldview defense in mainstream Muslims. However, while the level of worldview defense remained unchanged in atheists, it decreased in Sufis after MS. Additionally, in-group identification significantly moderated the effect of MS on worldview defense for mainstream Muslims and atheists; no significant moderation was observed for Sufis. A content analysis of the answers of the participants after MS revealed that positive emotions were more common in Sufis' answers, whereas negative emotions in mainstream Muslims and no emotions in atheists dominated the answers. Sufism, in which the emotional and behavioral dimensions of religiosity predominate, seemed to buffer the sense of terror. The findings highlight the importance of focusing on different religious and cultural lifestyles, such as Sufism, when studying the management of terror.Mus Alparslan UniversityWe thank Dr. Tara Ingman for English editing the manuscript
Investigation of the relationships among psychological and cognitive variables in basketball players: Rumination, cognitive flexibility, mental training, and self-regulated learningplayers
Full text linkBu araştırmanın amacı; basketbolcuların ruminasyon, bilişsel esneklik ve zihinsel antrenman beceri ve teknik düzeyleri ile öz düzenleme kavramları arasındaki ilişkinin incelenmesidir. Araştırmaya devlet üniversitelerinin Spor Bilimleri Fakültelerinde öğrenim gören 267 erkek ve 146 kadın olmak üzere toplam 413 basketbolcu kolayda örnekleme yöntemi kullanılarak gönüllülük esaslı katılımları dahilinde araştırma kapsamına alınmıştır. Araştırma ilişkisel tarama modelinde tasarlanmıştır. Araştırma kapsamında veri toplama aracı olarak "Kişisel Bilgi Formu, Spor Müsabakası Ruminasyon Ölçeği, Sporcu Bilişsel Esneklik Ölçeği, Sporda Zihinsel Antrenman Envanteri ve Öz Düzenlemeli Öğrenme Ölçeği" kullanılmıştır. Verilerin analizinde ilk olarak normallik varsayımları için çarpıklık basıklık değerlerine bakılmış ve dağılımın normal olduğu tespit edilmiştir. Bu doğrultuda iki bağımsız grup karşılaştırılmasında MANOVA analizi, değişkenler arasındaki ilişkileri belirlemek için Pearson Korelasyon analizi kullanılmıştır. Araştırmanın sonuçları, SPSS 24 ve R Studio yazılımı kullanılarak raporlanmıştır. Doğrudan ve dolaylı etkiler, yol (path) analizinde bootstrap tekniği ile 5000 yeniden örneklem seçeneği ve %95 güven aralığıyla analiz edilmiştir. Bu bağlamda bilişsel esneklik ve zihinsel antrenman egzojen (dışsal) değişken, öz düzenlemeli öğrenme aracı değişken ve ruminasyon endojen (içsel) değişken olduğu model kurulmuştur. Bulgular, bilişsel esnekliğin ruminasyonu azaltıcı etkisini vurgularken, zihinsel antrenmanın öz düzenlemeli öğrenme aracılığıyla ruminasyon üzerinde dolaylı bir etkiye sahip olabileceğini göstermektedir. Ayrıca, öz düzenlemeli öğrenmenin ruminasyonu azaltmada önemli bir rol oynadığı belirlenmiş, bu süreçlerin bireylerin bilişsel ve psikolojik iyi oluşlarını destekleyebileceği sonucuna ulaşılmıştır.The aim of this study is to examine the relationship between rumination, cognitive flexibility, mental training skills and techniques, and self-regulation among basketball players. A total of 413 participants, including 267 male and 146 female basketball players enrolled in the Faculties of Sports Sciences at public universities, were included in the study through convenience sampling based on voluntary participation. The study was designed using a relational survey model. As data collection instruments, the study utilized the "Personal Information Form, Sports Competition Rumination Scale, Athlete Cognitive Flexibility Scale, Mental Training Inventory in Sports, and Self-Regulated Learning Scale". For data analysis, normality assumptions were initially assessed through skewness and kurtosis values, confirming a normal distribution. Accordingly, MANOVA was employed for comparisons between two independent groups, while Pearson correlation analysis was used to determine relationships between variables. The results were analyzed using SPSS 24 and R Studio software. Direct and indirect effects were examined through path analysis using the bootstrap technique with 5,000 resampling iterations and a 95% confidence interval. In this context, cognitive flexibility and mental training were designated as exogenous (external) variables, self-regulated learning as a mediating variable, and rumination as an endogenous (internal) variable in the proposed model. The findings highlight the mitigating effect of cognitive flexibility on rumination, while also suggesting that mental training may exert an indirect influence on rumination through self-regulated learning. Additionally, self-regulated learning was found to play a significant role in reducing rumination, leading to the conclusion that these processes contribute to individuals' cognitive and psychological well-being
Biochemical Effects of Long-Term Exercise on Oxidative Stress and Antioxidant Markers in Adolescent Female Athletes
Full text linkBackground: Adolescence is a critical period where exercise-induced oxidative stress is modulated by both training adaptations and hormonal changes, particularly the antioxidant effects of estrogen in females. However, data on how adolescent female athletes respond to long-term exercise remain limited. The aim of this study was to examine oxidative stress levels and some antioxidant defense parameters in adolescent female athletes who train regularly. Methods: The study included 20 adolescent female basketball players (16.65 +/- 0.67 years; 165.50 +/- 0.06 cm; 59.75 +/- 5.50 kg) with at least three years of training experience and 20 non-athlete adolescent female participants (16.80 +/- 0.69 years; 159.95 +/- 0.04 cm; 60.15 +/- 4.23 kg). Malondialdehyde (MDA), glutathione (GSH), and catalase (CAT) levels were analyzed by a spectrophotometric method using a UV/VIS spectrophotometer in blood samples taken from all participants, and the data were compared between the groups. Results: The results showed that MDA levels were significantly lower in the athlete group (p 0.05; d = 0.15). A strong negative correlation was found between MDA and CAT (r = -0.900). Conclusions: These findings suggest that prolonged exercise reduces oxidative stress and enhances catalase-mediated antioxidant defense in adolescent women. Increased CAT activity and decreased MDA levels support this effect, while stable GSH levels point to the role of compensatory mechanisms