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Öğe A short-term durability comprehensive study of ceramic waste-doped White Cement composites with hooked-end, basalt and copper-coated fibers(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2025) Al-Sharhanee, Baraa Abduljabbar Badi; Mehmetoğlu, Metin; Aygörmez, Yurdakul; Niş, AnılWhite Cement (WC) mixes are an alternative product to the OPC. However, there are limited studies on the materials used in the production of composite materials as substitutes for the WC. Ceramic waste (CW) is an important alternative material in this regard. In this context, ceramic waste was replaced with White Cement at the rates of 5 %, 10 %, and 15 %, while three different fibers for reinforcement, namely hooked-end (HE) steel fiber, basalt (B) fiber, and copper-coated (CC) steel fiber (0.4 %) were used. The compressive and flexural strength results at 28 and 90 days were examined for the variations of White cement-based mortar properties. After 90 days, durability tests (sulfate effect, high temperature, and freeze-thaw) were applied while mechanical properties and weight losses were measured. SEM, XRD, Micro-CT, and TGA-DTA analyses were also used to see the changes with durability tests. According to the results, the increase in SiO2 and Al2O3 content in the addition of 5 % and 10 % ceramic waste increased the strength while keeping the pozzolanic reaction at a high level. In the case of 15 % substitution, it caused a reduction due to the decrease in the cement’s relative content. The hooked-end steel fiber, which was denser and longer, had the highest performance, while the copper-coated steel fiber showed the lowest performance. With 5 % ceramic powder and hooked-end steel fiber reinforcement, the flexural strength was enhanced by 26 %, while the compressive strength was enhanced by 17 % compared to the 100 % White Cement sample (control sample).Öğe Abatement of pollutant emissions in Nigeria: a task before multinational corporations(SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY, 2020) Udemba, Edmund Ntom; Agha, Christopher OkoFollowing the global alertness and consciousness over the increasing warming and heating on the ground of climate change, over 200 countries including Nigeria have committed themselves in reducing this global phenomenon. Nigeria being among the countries placed with individual country's task and also known as a one-economy operating county because of its oil and gas gifting is subject to investigation of its efforts and result in decarburization of its economy and environment. The oil and gas sector of Nigeria has been identified as the major sector where the heavy utilization of energy is centered on through mining and exploration activities of these foreign companies who have investments and stakes in the main stream sector. This is the major reason of adopting FDI as a major variable to test the performance of the environmental condition of the country. To effectively carry this research, the authors, adopt, cointegration test and the linear ARDL test to unveil the true picture of the foreign investors impact on carbon emission reduction. Among the findings is the positive but not significant interaction between economic growth and carbon emission which infers the capability of the economic operation to initiate the degradation in the environment via pollutant emission. Energy use depicts inducement to carbon emission with positive association with carbon emission. FDI established both negative and positive relationship with carbon emission at initial stage and lag 1 respectively. All the variables point towards carbon emission increase in the country which call for serious attention towards decarburization of the country to fall in line with the agreed policy of Paris formation.Öğe Accessibility to dental services by immigrant and refugee children residing in Turkey(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2022) Duman, Canan; Uslu, Fatih Samet; Çakmak, Sena; Aytekin, Şevval Ilgın; Apaydın, Tuana; Egil, EdibeBackground: Turkey is hosting the world's largest immigrant population under temporary and international protection. Due to the social inequalities contributing to early childhood dental caries, the effectiveness of dental care service for immigrant children should be evaluated. Aim: To evaluate the accessibility of immigrant and refugee children residing in four different regions of Turkey to oral health products and dental treatment services. Design: A questionnaire consisting of 21 questions was administered: The first six questions elicited demographic data, and the remaining 15 questions asked about oral health habits, access to oral hygiene materials, and dental treatment services. Participants included the parents of 430 children under the age of 18, who were registered with migrant associations in the regions where they lived (Istanbul, Samsun, Hatay, or Ankara). Results: The majority of the participants were from Syria and Iraq. Of the participants, 42.1% reported that their children's oral hygiene habits had changed negatively after they migrated, 71.9% reported that they had not been to the dentist in the last year, and 82.8% reported that they had not been to the dentist for more than 12months. Access to oral and dental hygiene products was not difficult for 68.4%. About 62.6%, however, reported that they had difficulty accessing dental treatment. Conclusion: The findings showed that this disadvantaged group had difficulty accessing dental treatment. Therefore, there is a need for national and international health strategies to ensure that immigrant and refugee children have effective access to dental treatment.Öğe Accounting for environmental sustainability from coal-led growth in South Africa: The role of employment and FDI(SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY, 2020) Joshua, Udi; Alola, Andrew AdewaleAs much as energy supply remains a major challenge in most of the African countries, the compounding environmental effect of energy consumption has continued to be a serious concern to policymakers and environmental stakeholders. On this note, this study seeks to investigate the coal-led growth hypothesis for South Africa by incorporating employment as a control variable for the first time. The incorporation of the employment in investigating the coal-led growth hypothesis especially for the case of South Africa is novel given that the World Coal Association (2016) reported that the country is the sixth largest exporter and seventh largest producer of coal globally. The study implemented an Autoregressive Distributed Lag (ARDL) bound testing to cointegration for the data spanning from 1970 to 2017. As such, the empirical result revealed that coal usage is the highest emitter of carbon, suggesting that a 1% increase in coal consumption account for about 68% emission in the short run, and 56% in the long run, respectively. On the other hand, foreign direct investment (FDI) inflow discourages carbon emission in the short-run and long run so that a 1% increase in FDI inflow causes a reduction in CO2 by about 0.003% and 001%. The novelty of this study is proven in the estimation of the interaction between employment and coal consumption. However, employment induced by economic growth and coal consumption both have significant tendencies of inflicting adverse environmental impacts in the short-run and long run. Thus, this study put forward relevant policy and for onward recommendation for the government to woo new foreign investors and to switch to renewable energy as an alternative sources as a possible approach of energy efficiency and environmental sustainability with a view to achieving sustainable development goals.Öğe Accounting for the combined impacts of natural resources rent, income level, and energy consumption on environmental quality of G7 economies: a panel quantile regression approach(SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY, 2021) Gyamfi, Bright Akwasi; Onifade, Stephen Taiwo; Nwani, Chinazaekpere; Bekun, Festus VictorAs the argument widens on the need to cut down on global carbon emissions, this study addresses environmental degradation using a combination of second-generation empirical methodologies including, quantile regression (QR), augmented mean group (AMG), fully modified ordinal least square (FMOLS), and dynamic ordinal least square (DOLS) to examine the impacts of natural resource rents alongside disaggregated energy consumption on the environmental quality of the G7 economies within the framework of the stochastic impact by regression on population, affluence, and technology (STIRPAT) model. The empirical findings reveal that the total natural resources rent indicates a positive significant relationship with pollution in all the quantiles except Q 0.05. Additionally, the findings for renewable energy consumption are adverse and significant throughout the assessed quantiles while fossil fuel energy consumption is reported to have a positive and significant effect on carbon dioxide emissions, thus, increasing environmental degradation experienced in the G7 economies. The extended findings from the Granger causality analysis also show that income levels combined with fossil fuel use have a strong effect on environmental degradation, while the total natural resources rent granger causes clean energy consumption within the G7 countries. This finding supports the assertions that natural resource revenue is mostly channeled into further productivity avenues which consequently lead to further environmental degradation. As such, while maintaining targeted revenue agenda, we strongly recommend that productivity gains from natural resource rents within the G7 economies should be harnessed for investment in clean energy for a more sustainable environment.Öğe Accuracy comparison of dimensionality reduction techniques to determine significant features from IMU sensor-based data to diagnose vestibular system disorders(ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND, 2020) İkizoğlu, Serhat; Heydarov, SaddamThis study is a significant step gone to develop Machine Learning (ML) algorithm to apply to gait sensory information collected from people to identify Vestibular System (VS) disorders. Although ML is widely used as diagnostic tool in medical decision-making, there is not much research done on application of ML methods to identify VS imperfections. In this paper, we compared the accuracies of two dimensionality-reduction techniques to use with SVM with Gaussian Kernel: Feature Selection (FS) and Feature Transformation (FT) methods. T-test and Sequential Backward Selection (SBS) were used for FS and Principal Component Analysis (PCA) and Kernel Principal Component Analysis (KPCA) with polynomial and Gaussian kernels were used as FT method. Both methods were applied to the dataset formed by 22 features collected from 37 people, of whom 21 were healthy and 16 subjects had VS-disorders. The highest accuracy among FT methods was 89.2%, while it was 81.1% for FS method. SVM with Gaussian Kernel, trained with the dataset of reduced dimensionality, had computation time of few hundreds of milliseconds, which makes real-time data processing possible. The importance of this work will obviously increase with the increase in the number of initial features. As a next step, we aim to increase dataset and use additional features extracted from pressure sensors placed under the feet. We also aim to use time domain characteristics of the features to increase overall accuracy as a next step.Öğe Achieving environmental sustainability through green transformational leadership policy: Can green team resilience help?(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2021) Çöp, Serdar; Olorunsola, Victor Oluwafemi; Alola, Uju VioletThe race to gain competitive advantage through the formulation of a sustainable business strategy is key for the survival in the global business sphere. Even more importantly is the quest to deploy an effective green strategy to combat the numerous negative impact industrialization has on the environment. Researches pointed out the role of leaders and stakeholder's engagement in bringing about reform. This research focuses on how to build a robust psychological capital within an organization through the leader's transformative ability in combating environmental issues. This is necessary because research related to green transformational leadership and the effect on green team resilience has not been considered in literature. Drawing from the combination of three theories; broaden-and-build theory, job demand– resource theory, and conservation of resource theory, this study contributes to the extant literature by testing the effect of green transformational leadership via the mediating role of green work engagement to green team resilience. Using Amos 20 version to analyze 351 questionnaires that were collected from employees in four and five star hotels in Turkey, the result reviews that green transformational leadership has a positive effect on green work engagement and green team resilience, and green work engagement fully mediates the relationship between the variables. The theoretical and practical implications are discussed.Öğe ADHD and Anxiety Disorder Comorbidity in Children and Adults: Diagnostic and Therapeutic Challenges(SPRINGER, ONE NEW YORK PLAZA, SUITE 4600 , NEW YORK, NY 10004, UNITED STATES, 2022) Koyuncu, Ahmet; Ayan, Tuğba; İnce Guliyev, Ezgi; Erbilgin, Seda; Deveci, ErdemPurpose of the Review In this review, we focus on overlapping features of ADHD and anxiety disorders, and will discuss how an anxiety disorder comorbidity leads to diagnostic and treatment challenges in patients with ADHD, in consideration of the accumulated available knowledge. Recent Findings The presence of overlapping symptoms, changes in the diagnostic criteria, and the use of divergent diagnostic tools and informant efects can complicate the diagnosis of this comorbidity. Due to the ongoing debate about the etiology, psychopathology, and diagnostic features of the association between ADHD and anxiety disorders, choosing appropriate treatment options emerges as a challenge. Summary A novel methodology, standardized interview tools, and new statistical analysis methods are needed to defne the phenotype of this co-occurrence more clearly. It is important to uncover the developmental nature of this comorbidity with follow-up studies that may explain the etiology and underlying neurobiological basis, and ultimately lead to more efective treatment approaches.Öğe Advancing sustainable food preservation: Ultrasound and thermosonication as novel approaches to enhance nutritional and bioactive properties of broccoli juice(Elsevier Ltd, 2025) Yıkmış, Seydi; Türkol, Melikenur; Dülger Altıner, Dilek; Duman Altan, Aylin; Sağlam, Kübra; Abdi, Gholamreza; Tokatlı, Nazlı; Çelik, Güler; Aadil, Rana MuhammadTo meet the challenges of sustainability and nutritional quality, innovative food processing technologies are essential. This study investigates the application of ultrasound and thermosonication- emerging non-thermal preservation techniques- to improve the functional properties of broccoli juice. Using Response Surface Methodology (RSM) and Adaptive Neuro-Fuzzy Inference System (ANFIS), the processes were optimised to maximize chlorophyll and ascorbic acid content. Optimal ultrasound parameters (4 min, 91.1 % amplitude) achieved 12.29 mg/100 mL chlorophyll and 79.38 mg/100 g ascorbic acid. Thermosonication (6.9 min, 66 % amplitude, 40 ◦C) gave comparable results. Both treatments significantly improved phenolic composition and mineral content, demonstrating superior preservation of bioactive compounds and reduced nutrient degradation compared to traditional methods. The results highlight the potential of ultrasound and thermosonication for sustainable food systems by improving nutritional quality and shelf life, thereby contributing to reduced food waste and environmentally friendly processing. This research provides valuable insights into the integration of non-thermal technologies in the production of functional beverages, supporting the development of circular food systems and sustainable innovation.Öğe Aeolian imprints of multiple Mediterranean invasions of the Black Sea during Pleistocene(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2022) Erginal, Ahmet Evren; Kıyak, Nafiye Güneç; Makaroğlu, Özlem; Bozcu, Mustafa; Öztürk, Muhammed Zeynel; Selim, Hamit Haluk; Nowacyzk, Norbert R.; Kaya, Nurcan; Öztürk, Tuğba; Karabıyıkoğlu, Mustafa; Polymeris, Georgios S.Climate changes determined the repeated connections between the Black Sea, Caspian Sea and Mediterranean Sea. The landlocked anoxic Black Sea basin was exposed to several transgressions throughout Quaternary by the Mediterranean Sea through the Straits of Istanbul (Bosphorus) and by the Caspian Sea through the Manych-Kerch spillway. Sedimentological records of these connections are limited mostly to the marine terrace deposits of Marine Isotope Stage (MIS) 5e while the pre-MIS 5e period remains uncertain due to a lack of robust facies and chronological data from deep-sea sedimentary sequences. Here we discuss the imprints of multiple Mediterranean transgressions during Middle Pleistocene in the Black Sea based on facies analysis and the optical age of coastal carbonate aeolianites. Contrary to today’s hydro-climate of the Black Sea, the aeolianites bear witness to the transformation of the Black Sea into a warm inland sea during successive Mediterranean invasions. Prior to the onset of aeolian deposition, paleosols were formed on the Eocene-aged hardened sandy silts, suggesting strongly washed soil. This is evidenced by no calcium carbonate and a high Rb/Sr ratio, with quartz amounting to of 99.8%. According to our OSL ages, carbonates deposited on the shelf plain under higher temperature and increased evaporation conditions in MIS 15 and the later interglacial phases were transported to the coastal sand dunes during the transitional phases of MIS 15–14, MIS 13–12, MIS 11–10 and MIS 9–8. We suggest that the carbonate-rich and ooid-containing aeolianites were repeatedly formed in the multiple Mediterranean transgression stages, beginning with an increasingly severe dry phase following the Brunhes-Matuyama magnetic reversal.Öğe An algorithm for numerical solution of some nonlinear multi-dimensional parabolic partial differential equations(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2021) Özdemir, Neslihan; Seçer, Aydın; Bayram, MustafaIn this research paper, a numerical method, named the three-step Ultraspherical wavelet collocation method, is presented for solving some nonlinear multi-dimensional parabolic partial differential equations. The method is third-order accurate in time. In this method, the three-step Taylor method is used to get the time derivative, while the Ultraspherical wavelet collocation method is used to get the space derivatives. Ultraspherical wavelets have good properties which make useful to carry out this aim. The presented method is developed for Burgers’ equation, Fisher–Kolmogorov–Petrovsky–Piscounov (Fisher–KPP) equation, and quasilinear parabolic equation. Three illustrative numerical problems are solved to demonstrate the efficiency, simplicity, and reliability of the presented method.Öğe The alternative energy utilization and common regional trade outlook in EU-27: Evidence from common correlated effects(PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2021) Adedoyin, Festus Fatai; Alola, Andrew Adewale; Bekun, Festus VictorThe role of low-carbon energy and trade on the environment has drawn several studies that have looked at issues from different perspectives, thus yielding differing conclusions. Considering the current emphasis on the COP25 conference and the commitment to cut down carbon emissions level, this study also draws strength from the United Nations Sustainable development Goals (UNSDGs) that comprises of positive strides for access to clean and responsible energy consumption (SDGs 7, 12) and climate change mitigation issues (SDG-13). To this end, this study is a timely outlook that underpins the case of the European Union (EU) countries as well as the root cause of anthropogenic activities on clean trajectory of global environment. Hence, we investigate the connection between alternative and sustainable energy source, trade, income and emissions in 27 selected European Union economies by utilizing data covering the period 1990–2017 on an annual frequency. We used second-generation panel model estimators to analyze the relationship between the variables in the long-run. Specifically, the long run results from the MG (Mean Group), AMG (Augmented Mean Group), and CCEMG (Common Correlated Effects Mean Group) estimators reveal that sustainable and alternative energy sources have a negative significant impact on pollutant emissions while trade and income have a positive impact on carbon emissions except that the impact of trade is insignificant. Although the positive impact of openness in trade on carbon emission is insignificant, the positive impact suggests that the free-trade policy that is currently in place in the EU should further incorporate sustainable development goals (SDGs) to avoid the outsourcing of carbon emissions among the member countries. Causality tests reveal a feedback hypothesis between renewable energy, income, trade, and carbon emanations. The investigation proposes expanded utilization of sustainable power source to mitigate carbon emissions in the European Union.Öğe Alzheimer, Parkinson, dementia, and phytochemicals: insight review(TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106, 2024) Can, Başak; Şanlıer, NevinAlzheimer’s, Parkinson’s, and dementia are the leading neurodegenerative diseases that threaten the world with the aging population. Although the pathophysiology of each disease is unique, the steps to be taken to prevent diseases are similar. One of the changes that a person can make alone is to gain the habit of an antioxidant-rich diet. Phytochemicals known for their antioxidant properties have been reported to prevent neurodegenerative diseases in various studies. Phytochemicals with similar chemical structures are grouped. Accordingly, there are two main groups of phytochemicals, flavonoid and non-flavonoid. Various in vitro and in vivo studies on phytochemicals have proven neuroprotective effects by increasing cognitive function with their anti-inflammatory and antioxidant mechanisms. The purpose of this review is to summarize the in vitro and in vivo studies on phytochemicals with neuroprotective effects and to provide insight.Öğe Amassing the Security: An ECC-Based Authentication Scheme for Internet of Drones(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141, 2021) Hussain, Sajid; Chaudhry, Shehzad Ashraf; Alomari, Osama Ahmad; Alsharif, Mohammed H.; Khan, Muhammad Khurram; Kumar, NeerajThe continuous innovation and progression in hardware, software and communication technologies helped the expansion and accelerated growth in Internet of Things based drone networks (IoD), for the devices, applications and people to communicate and share data. IoD can enhance comfort in many applications including, daily life, commercial, and military/rescue operations in smart cities. However, this growth in infrastructure smartness is also subject to new security threats and the countermeasures require new customized solutions for IoD. Many schemes to secure IoD environments are proposed recently; however, some of those were proved as insecure and some degrades the efficiency. In this article, using elliptic curve cryptography, we proposed a new authentication scheme to secure the communication between a user and a drone flying in some specific flying zone. The security of the proposed scheme is solicited using formal Random oracle method along with a brief discussion on security aspects provided by proposed scheme. Finally, the comparisons with some related and latest schemes is illustrated.Öğe The anaesthetic management of a living donor renal transplantation with diaphragma paralysis following previous cardiac surgery. A case report(Wiley-Blackwell, 2015) Acar, M. Levent; Koprulu, A. Sefik; Sener, Tufan; Turunc, Volkan; Yildirim, Sadik[Abstract Not Available]Öğe Analyzing transport demand and environmental degradation: the case of G‑7 countries(SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS, 2022) Erdoğan, Sinan; Sarkodie, Samuel Asumadu; Adedoyin, Festus Fatai; Bekun, Festus Victor; Owusu, Phebe AsantewaaThe debate for green development has been ongoing in the energy and environment literature—especially initiatives to mitigate climate change. On this note, we explore the efects of the air and railway transport demand, fossil-fuel energy consumption, demographic policies, economic growth, and alternative energy consumption on environmental degradation in Group of Seven (G7) economies. Using robust panel estimation techniques that account for cross-sectional dependence, empirical results afrm the presence of long-run relationships among variables. Besides, the results give credence to the environmental Kuznets curve hypothesis (EKC) in G7 countries over the sampled period. We observe that demand for air transport, energy from fossil fuel sources, and economic development dampen environmental quality by 0.12%, 0.33%, and 46.54%, respectively. Interestingly, renewable energy and rail transportation demand improve environmental quality. This outcome resonates with the need for alternative and clean energy production and consumption (Sustainable Development Goals 11 and 12) while enhancing the fght against climate change—especially the adoption of clean energy technologies in the air transport sector for sustainable growth.Öğe An anonymous device to device access control based on secure certificate for internet of medical things systems(ELSEVIER, RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2021) Chaudhry, Shehzad Ashraf; Irshad, Azeem; Nebhen, Jamel; Bashir, Ali Kashif; Moustafa, Nour; Al-Otaibi, Yasser D.; Bin Zikria, YousafThe Internet of Medical Things (IoMT) is structured upon both the sensing and communication infrastructure and computation facilities. The IoMT provides the convenient and cheapest ways for healthcare by aiding the remote access to the patients’ physiological data and using machine learning techniques for help in diagnosis. The communication delays in IoMT can be very harmful to healthcare. Device to device (D2D) secure communication is a vital area that can reduce communication delays; otherwise, caused due to the mediation of a third party. To substantiate a secure D2D communication framework, some schemes were recently proposed to secure D2D based communication infrastructure suitable for IoMT-based environments. However, the insecurities of some schemes against device physical capture attack and non-provision of anonymity along with related attacks are evident from the literature. This calls for a D2D secure access control system for realizing sustainable smart healthcare. In this article, using elliptic curve cryptography, a certificate based D2D access control scheme for IoMT systems (D2DAC-IoMT) is proposed. The security of the proposed D2DAC-IoMT is substantiated through formal and informal methods. Moreover, the performance analysis affirms that the proposed scheme provides a good trade-off between security and efficiency compared with some recent schemes.Öğe The anthropogenic consequences of energy consumption in E7 economies: Juxtaposing roles of renewable, coal, nuclear, oil and gas energy: Evidence from panel quantile method(ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND, 2021) Gyamfi, Bright Akwasi; Adedoyin, Festus Fatai; Bein, Murad A.; Bekun, Festus Victor; Agozie, Divine Q.The emerging industrialized seven (E7) economies are not excluded from the global warming issues which is a major problem for most economies. The E7 member countries have partaken in policies to mitigate against global warming in terms of decoupling CO2 emission from economic growth trajectory in the highlighted economies. It is on this premise that the present study is motivated to consider the connection among economic growth, pollutant emissions, coal rent while accounting for the role of other co-variates such as CO2 damage and energy from a nuclear energy source, oil gas energy between 1990 and 2016 on an annual frequency. This study adopts the use of panel ordinary least squares alongside panel quantile regression to explore the coal rent-energy and environment nexus. The empirical result shows a positive and significant effect of both real GDP and coal rent on CO2 emissions. More precisely, a 1% increase in GDP growth increases pollution emission by 0.400% while for coal rent, an increase in coal consumption dampens environmental quality by 0.088% as reported by the panel regression which is resonated by the quantile regression estimations at different tails of the data. Nevertheless, we observe that 0.95 percentile GDP growth strongly contributes to environmental pollution while at the median tail i.e. 0.5 percentile renewable energy consumption dampens the adverse effect of environmental degradation. Additionally, renewable energy, on the other hand, was found a negative and significant impact on CO2 emissions in E7 countries as a 1% increase in renewable energy consumption improves environmental quality by 0.588% Moreover, the estimated results indicate that regulation of coal consumption through the rent in addition to the cost of carbon damage will further increase the CO2 emissions in E7 countries. This study implies that putting stringent regulations on coal consumption as it concerns the increasing cost of carbon damage will not be of help to environmental sustainability within the E7 economies. The adoption of renewable energy consumption, nuclear energy, oil energy will reduce CO2 emissions in E7 countries. Thus, suggesting a paradigm shift for low-carbon energy sources which are more environmentally friendly.Öğe Anxiety and hopelessness levels in COVID-19 pandemic: A comparative study of healthcare professionals and other community sample in Turkey(PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2020) Hacımusalar, Yunus; Kahve, Aybeniz Civan; Yaşar, Alişan Burak; Aydın, Mehmet SinanCOVID-19 affected our mental health as well as our physical health. In this study, the anxiety and hopelessness levels of healthcare workers and non-healthcare workers and the factors affecting them were evaluated in Turkey. Beck Hopelessness Scale and State-Trait Anxiety Inventory (STAI) was applied online to participants. Totally 2156 individuals were included in the study and 52.0% (n:1121) of them are healthcare workers. The hopelessness and state anxiety levels of healthcare workers were higher than non-healthcare workers. Nurses' hopelessness levels are higher than doctors, and state anxiety levels are higher than both doctors and other healthcare workers. Anxiety and hopelessness levels were higher in women, those living with a high-risk individual at home during the pandemic, those who had difficulty in caring for their children, and those whose income decreased. Anxiety levels are an important predictor of hopelessness. The increase in anxiety levels explained 28.9% of the increase in hopelessness levels. Increased working hours is one of the important factors affecting anxiety. As a conclusion, healthcare workers were more affected psychologically in the COVID-19 pandemic compared to the society. Nurses were affected more than other healthcare workers. It is important to identify the factors affecting anxiety, hopelessness, and individuals who may be more psychologically affected during the pandemic. An important contribution can be made to the protection of public health by ensuring that psychosocial interventions for high-risk groups are planned in advance.Öğe An approach to the solution of nonlinear forced vibration problem of structural systems reinforced with advanced materials in the presence of viscous damping(ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND, 2021) Sofiyev, Abdullah H.; Avey, Mahmure; Kuruoğlu, NuriIn this study, the nonlinear forced vibration of composite structural systems such as plates, panels and shells reinforced with advanced materials in the presence of linear viscous damping is investigated. Hamilton principle and von K´ arman-type ´ nonlinear theory are used to obtain the theoretical model of double-curved shells reinforced by carbon nanotubes (CNTs). The nonlinear partial differential equations are reduced to ordinary differential equations using Galerkin method. By using the multiscale method, the frequency-amplitude relation and nonlinear forced vibration frequency of structural systems are obtained for the first time. Since double-curved shells can be transformed into other structural systems such as spherical and hyperbolicparaboloid shells, rectangular plate and cylindrical panel in special cases, the expressions for nonlinear frequencies can also be used for them. In additional, the backbone curve and the nonlinear frequency/linear frequency ratio are determined as a function of the amplitude in primary resonance for the first time. The results are verified by comparing the reliability and accuracy of the proposed formulation with those in the literature. Finally, a systematic study is aimed at controlling the influence of nonlinearity and types of distribution of CNTs on the frequencies and their quantitative and qualitative variation in the presence of external excitation and viscous damping.
