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DETERMINATION OF EFFICIENCIES OF INFORMATION TECHNOLOGY SECTOR COMPANIES TRADED ON BORSA ISTANBUL IN TERMS OF FINANCIAL PERFORMANCES UNDER THE EFFECT OF COVID-19 PANDEMIC BY USING DEA WINDOW ANALYSIS
No full textWindow analysis is a time-dependent variant of Data Envelopment Analysis (DEA) and it is based on the moving average method. It is used for showing the trend of Decision Making Units’ (DMUs') performance over various times. The efficiency changes of 13 companies operating in Borsa Istanbul (BIST) Information Technology (IT) sector for quarterly periods between 2019:03 and 2021:06 are evaluated by DEA Window Analysis. The input-oriented CCR model and the input-oriented BCC Windows analysis models are applied on data set. When the CCR model and BCC model window analysis results are evaluated together, one of the first two periods with the highest average efficiency for both of them is 2021:06, and the period with the lowest average efficiency for both of them is 2019:09. DESPC company has the highest average efficiency for both models
Investigation of full-charm and full-bottom pentaquark states
No full textThe continuous advancement of experimental techniques and investigations has led to observations of various exotic states in particle physics. Each addition to this family of states not only raises expectations for future discoveries but also focuses attention on such potential new states. Building upon this motivation and inspired by recent observations of various traditional and exotic particles containing an increased number of heavy quarks, our study provides a spectroscopic search for potential pentaquark states with spin-parity 32-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} and composed entirely of charm or bottom quarks. We predict the masses for full-charm and full-bottom pentaquark states as m=7628 +/- 112\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} MeV and m=21,982 +/- 144\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} MeV, respectively. We also compute the current couplings of these states to vacuum, which are main inputs in investigations of their various possible decays.Iran National Science Foundation [ISEF/M/99171]; Iran Science Elites Federation (Saramadan)K. Azizi is thankful to Iran Science Elites Federation (Saramadan) for the partial financial support provided under the grant number ISEF/M/99171
Perceived stress and psychological symptoms the relationship of the individual with body sensations a study on prediction of
No full textLisansüstü Eğitim Enstitüsü, Psikoloji Ana Bilim DalıBu araştırmanın amacı algılanan stres ile psikolojik belirtileri yordamak ve beraberinde eşlik eden beden duyumlarını araştırmak amaçlanmaktadır. Araştırmanın örneklemi 18-65 yaş arası yetişkinlerden oluşmaktadır. Katılımcıların 267'si kadın (%68.50) ve 123'ü (%31.50) erkek olup toplam 390 kişidir. Çalışmada Demografik Bilgi Formu, Algılanan Stres Ölçeği (ASÖ), SCL90-R Ölçeği ve Beden Duyumları Ölçeği (BDÖ) kullanılmıştır. Ölçümlerden elde edilen düzeylerin demografik değişkenlere göre farkının incelenmesi için iki gruplu demografik değişkenler için bağımsız örneklem t-testi ikiden fazla gruplu demografik değişkenler için ise tek yönlü Anova analizi yapılmıştır. Bağımsız değişkenin/değişkenlerin bağımlı değişken üzerindeki etki düzeyinin incelenmesi için doğrusal/çoklu doğrusal regresyon analizi yapılmıştır. Ölçeklerden elde edilen puanların ile kategorik değişkenlerin kategori grupları arasındaki farklılıkların anlamlılığındaysa değişkenlere göre farkının incelenmesi için iki gruplu değişkenler için bağımsız örneklem t-testi ikiden fazla gruplu değişkenler için ise tek yönlü Anova analizi yapılmıştır. Araştırmada elde edilen bulgulara ulaşmak için SPSS 25.0 programı kullanılmıştır. Bu araştırmada algılanan stres ve psikolojik belirtilerin bireyin beden duyumlarıyla arasındaki ilişkinin öngörülebildiği sonucuna ulaşılmıştır. Algılanan stresin artması, psikolojik belirtilerin görülmesine ve beden duyumlarının hissedilmesinde olumlu olarak etkide bulunmaktadır. Mevcut çalışma literatüre bireylerin günlük işlevsellikleri etkilenebileceği düşünüldüğü için gerekli stratejilerin geliştirilmesi açısından önemli katkı sağlayabileceği düşünülmektedir ve diğer araştırmacılar için yeni çalışma alanları ve hipotezler oluşturulmasına olanak sağlayabilir.The aim of this study is to investigate the prediction of perceived stress and psychological symptoms and to explore the accompanying bodily sensations. The sample of the study consists of adults aged between 18 and 65 years. There are 267 female participants (68.50%) and 123 male participants (31.50%), making a total of 390 individuals. In the study, a Demographic Information Form, Perceived Stress Scale (PSS), SCL90-R Scale, and Body Sensations Scale (BSS) were used. Independent samples t-test was conducted for two-group demographic variables and one-way ANOVA analysis was performed for demographic variables with more than two groups to examine the differences in levels obtained from measurements according to demographic variables. Linear/multiple linear regression analysis was used to examine the level of effect of independent variable(s) on the dependent variable. Independent samples t-test was conducted for two-group variables and one-way ANOVA analysis was performed for variables with more than two groups to examine the differences in scores obtained from scales among categorical variables. SPSS 25.0 software was used to reach the findings of the study. The results of this study suggest that the relationship between perceived stress and psychological symptoms can predict an individual's bodily sensations. An increase in perceived stress positively contributes to the occurrence of psychological symptoms and the perception of bodily sensations. The current study is considered to contribute significantly to the development of necessary strategies in terms of its potential impact on daily functionality of individuals, as perceived in the literature. It may also facilitate the exploration of new research areas and hypotheses for other researchers
Fully charmed resonance X(6900) and its beauty counterpart
No full textThe fully heavy scalar tetraquarks T4Q=QQQ?Q?, (Q=c,b) are explored in the context of QCD sum rule method. We model T4Q as diquark-antidiquark systems composed of pseudoscalar constituents, and calculate their masses m(?) and couplings f(?) within the two-point sum rule approach. Our results m=(6928±50)MeV and m?=(18858±50)MeV for masses of the tetraquarks T4c and T4b prove that they can decay to hidden-flavor heavy mesons. The full width ?4c of the T4c is evaluated by taking into account the decay channels T4c?J/?J/?, J/???, ?c?c, ?c?c(2S), ?c?c1(1P), and ?c0?c0. The partial widths of these processes depend on strong couplings gi at vertices T4cJ/?J/?, T4cJ/??? etc., which are computed using the QCD three-point sum rule method. The decay T4b??b?b is used to find the width ?4b of the T4b. The predictions for m and ?4c=(128±22)MeV are compared with parameters of the fully charmed resonances reported by the LHCb, ATLAS, and CMS Collaborations. Based on this analysis, we interpret the tetraquark T4c as a candidate to the resonance X(6900). The mass m? and width ?4b=(94±28)MeV of the exotic meson T4b can be used in future experimental investigations of these states. © 2023 Elsevier B.V
A Modified Approach to the Rack Generation of Beveloid Gears
No full textThe purpose of this paper is to present an easier and more efficient method for the determination of the geometry of a bevelled gear tooth. Based on a method that provides an easier way for the rack generation of involute helical gears, the mathematical model of a beveloid gear is studied. The mathematical procedure for developing two-dimensional cross-sections has been extended to three-dimensional gear models. A computer programme is developed to obtain generating and generated surfaces. The proposed algorithm is compared with the previous studies for verification and validation. The results demonstrate that the coordinates obtained from the given method are nearly the same on the start and end points of the main gear parts, such as the involute and root fillets regions. Also, between the limits, the values can be considered acceptable. A coordinate deviation of the gear profile has been observed in the mathematical model, because of the profile shift. Modifications have been developed in the equations to eliminate these cases. The main advantage of the proposed method is to obtain mathematical models without carrying out some of the calculation steps used in previous studies. Eventually, this feature will provide an easier and faster method to develop computer-aided models of the beveloid gear types
Environmental quality and health expenditures efficiency in Turkiye: the role of natural resources
No full textThe environmental pollution caused by climate change and global warming pose significant risks to health. This raises the question how environmental disturbances can affect health expenditures. Based on this, this study examines the asymmetric effect of environmental quality on health expenditures in Turkiye using the non-linear ARDL (NARDL) model for the 1975-2019 period. In addition to environmental quality, natural resources, economic growth, and trade openness variables are also included in the health expenditure model. The findings support the existence of an asymmetric cointegration relationship between the series. The findings also indicate that positive environmental pollution shocks affect health expenditures positively in the long run, while negative environmental pollution shocks do not have a statistically significant effect on health expenditures. Positive and negative natural resource shocks affect health expenditures negatively in the long run. Despite the effect of positive economic growth shocks on health expenditures is positive but statistically insignificant, the effect of negative economic growth shocks is positive and significant. Besides, positive trade openness shocks have a negative effect on health expenditures and negative trade openness shocks have a positive effect. The findings prove that the steps to be taken to protect the environment in the current period will increase the effectiveness of health expenditures in the future. This situation has a guiding feature for policy-makers in terms of policy decisions
Links connecting conflict management behaviors, job satisfaction and innovation performance in the retail grocery sector in Turkey
No full textThis paper explores the associations between conflict management behaviors, job satisfaction, and innovation performance as felt by 322 blue-collar workers in supermarket chains in Istanbul. The authors collected data through direct and virtual surveys and a convenience sampling methodology. The study uses frequency analysis, confirmatory factor analysis, item-level summary statistics, linear regression analysis, moderating analysis, and simple plots. The results indicate that integrating and compromising managers are significantly and positively associated with innovation performance while dominating, obliging, and avoiding managers are significantly and negatively related to innovation performance. Job satisfaction significantly and positively moderates the links between integrating and compromising managers and innovation performance. Job satisfaction significantly and negatively affects the relationships between dominating, obliging, and avoiding managers and innovation performance. The study focuses on some supermarkets and treats a low number of respondents. Conflict management strategies reflect employee perceptions that might lead to attributive misconceptions. The paper exclusively portrays how job satisfaction moderates links between management styles in dispute resolution and novelty
Hastaların Hemşirelik Öğrencilerine Yönelik Bakım Algısı Ölçeğinin Türkçe Uyarlaması: Geçerlik ve Güvenirlik Çalışması
No full textGiriş: Hastaların bakım ihtiyaçlarının karşılanması hemşirelerin yanı sıra hemşirelik öğrencilerinden de beklenen önemli bir yetkinliktir. Amaç: Bu çalışmanın amacı Hastaların Hemşirelik Öğrencilerine Yönelik Bakım Algısı Ölçeği’nin Türkçe uyarlamasını ve psikometrik analizlerini yapmaktır. Yöntem: Metodolojik tipte olan bu araştırma, Haziran-Temmuz 2022 tarihleri arasında İstanbul’da bulunan bir devlet hastanesinde 291 hasta ile yürütüldü. Veriler Katılımcı Bilgi Formu ve Hastaların Hemşirelik Öğrencilerine Yönelik Bakım Algısı Ölçeği kullanılarak toplandı. Dil eşdeğerlilik ve kapsam geçerliği için uzman görüşü alındı. Verilerin analizinde tanımlayıcı istatistik ve yapı geçerliğine yönelik açıklayıcı ve doğrulayıcı faktör analizi kullanıldı. İç tutarlılığı belirlemek amacıyla Cronbach alfa güvenirlik katsayısı hesaplanarak test-tekrar test güvenirlik korelasyonu yapıldı. Bulgular: Hastaların Hemşirelik Öğrencilerine Yönelik Bakım Algısı Ölçeği puan ortalamasının 4,46 ± 0,53 arasında olduğu bulundu. Uyum indeksleri değerleri X2=88,2; x2/sd=1,02; RMSEA=0,03; CFI=0,99; GFI=0,97; AGFI=0,87; NFI=0,96; SRMR=0,04 bulunarak faktör yapısının iyi uyum gösterdiği bulundu. Açımlayıcı faktör analizi sonucunda ölçme aracının dört boyut (profesyonellik, güvence, kişilerarası ilişki ve bilgi-beceri) ve 28 maddeden oluştuğu belirlendi. Cronbach alfa güvenilirlik katsayısı 0,94 olduğu belirlendi ve ölçeğin yüksek derecede güvenilir bir ölçek olduğu bulundu. Sonuç: Hastaların Hemşirelik Öğrencilerine Yönelik Bakım Algısı Ölçeği Türk kültürü için geçerli ve güvenilir bulundu
Depression/ anxiety in siblings of children with cerebral palsy and relationship between their siblings
No full textLisansüstü Eğitim Enstitüsü, Psikoloji Ana Bilim DalıBu araştırmanın amacı serebral palsi tanılı ve normal gelişim gösteren kardeşe sahip çocukların; depresyon/anksiyete düzeylerinin ve kardeş ilişkilerinin karşılaştırılmasıdır. Araştırmaya 7-18 yaş arası; serebral palsi tanılı kardeşe sahip olan 59 çocuk ile normal gelişim gösteren kardeşe sahip 59 çocuk katılmıştır. Bu araştırmada veri toplama aracı olarak Kişisel Bilgi Formu, Çocuklarda Anksiyete ve Depresyon Ölçeği, Schaeffer Kardeş Davranışı Değerlendirme Ölçeği kullanılmıştır. Bilgi formunda; katılımcıya ait cinsiyet, yaş, aile tipi, ebeveyn birliktelik durumu gibi değişkenler yer almaktadır. Veriler SPSS for Windows 22.0 paket programıyla analiz edilmiştir. Çalışmamızda serebral palsi tanılı kardeşi olan çocuklar tipik gelişim gösteren kardeşi olan çocuklar ile kıyaslandığında depresyon ve anksiyete görülme sıklığının daha düşük olduğu sonucuna ulaşılmıştır. Serebral palsi tanılı kardeşe sahip çocukların tipik gelişim gösteren kardeşe sahip çocuklara kıyasla, kardeşine karşı daha nazik olduğu, kardeşi ile daha çok birliktelik kurduğu ve ilgilendiği, kardeşiyle daha yüksek düzeyde empati kurduğu ve kardeşine karşı daha düşük fiziksel saldırganlık gösterdiği sonucuna ulaşılmıştır.The aim of this research is to compare the depression/anxiety sibling relationships of children who have sibling with cerebral palsy and typically developing. Participants in the study are between the ages of 7-18. 59 children who have sibling with cerebral palsy and 59 children who have typically developing particapated in the research. Personal Information Form, Schaeffer Sibling Behavior Rating Scale, Child Anxiety and Depression Scale tools have been used to collect data in this research. In the Personal Information Form, there are variables such as gender, age, family type and parental marital status of the participants. The data were analyzed with the SPSS for Windows 22.0 package program. In our study, it was concluded that the incidence of depression and anxiety was lower in children who have sibling with cerebral palsy compared to children with typically developing sibling. It was concluded that children who have sibling with cerebtal palsy were kinder towards their siblings, more associated with and interested in their sibling, a higher level of empathy with their sibling, and less physical aggression towards their sibling, compared to children with typically developing sibling
A new numerical algorithm based on Quintic B-Spline and adaptive time integrator for Cou-pled Burger's equation
No full textIn this article, the coupled Burger's equation which is one of the known systems of the nonlinear parabolic partial differential equations is studied. The method presented here is based on a combination of the quintic B-spline and a high order time integration scheme known as adaptive Runge-Kutta method. First of all, the application of the new algorithm on the coupled Burger's equation is presented. Then, the convergence of the algorithm is studied in a theorem. Finally, to test the efficiency of the new method, coupled Burger's equations in literature are studied. We observed that the presented method has better accuracy and efficiency compared to the other methods in the literature