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İnce Cidarlı Çelik Tübüler Direklerin Dinamik Performansı Üzerine Pasif Sarkaç Ayarlı Kütle Sönümleyicilerin Etkilerinin Deneysel ve Sayısal İncelemesi
No full textİnce cidarlı çelik tübüler (İCÇT) direkler, çeşitli endüstrilerde kullanılan yaygın yapı türlerindendir. Bu direkler; güçlü, dayanıklı ve çok yönlü yapılarıyla bilinir. İCÇT direkleri, sismik aktiviteler, mekanik kaynaklar ve özellikle meteorolojik olaylar nedeniyle oluşan titreşimler sonucu büyük genliklerde döngüsel yer değiştirmeler ve hatta arızalar yaşayabilir. İCÇT direklerinin hizmet ömrünü ve üzerine monte edilen ekipmanların performansını artırmak için, bu direkler çeşitli servis yüklemeleri altında uygun önlemlerle aşırı titreşimlerden korunmalıdır. Bu çalışma, İCÇT direği üzerine monte edilen pasif sarkaç ayarlı kütle sönümleyicilerin (P-SAKS) performansını kapsamlı bir deneysel ve sayısal analizle araştırmaktadır. P-SAKS'lı ve P-SAKS'sız İCÇT direkleri için yapılan serbest titreşim testleri;10 kg, 20 kg ve 30 kg yüklemelerle uyarılmış ve üç farklı başlangıç uç deplasman genliği kullanılmıştır. Dinamik performanslar, yer değiştirme ve ivme tepkileri üzerinden işlemsel modal analiz (İMA) teknikleri ile değerlendirilmiştir. Ardından, İCÇT direklerinin serbest titreşim davranışları sonlu eleman (SE) modelleri ile simüle edilmiş ve SE modeli tarafından tahmin edilen parametreler ölçülen performans parametreleri ile karşılaştırılmıştır. Bu araştırmanın sonuçları, P-SAKS kullanımının, İCÇT direklerin dinamik yanıtlarını önemli ölçüde iyileştirebileceğini ortaya koymaktadır. Bu bulgular, deprem bölgelerindeki ve diğer yüksek riskli alanlardaki yapısal güvenlik standartlarının geliştirilmesine katkı sağlayabilir. Ayrıca, mühendislik uygulamalarında P-SAKS'ın entegrasyonu, bu tür yapıların daha uzun hizmet ömürleri ve düşük bakım maliyetleri ile daha güvenilir hale gelmesine olanak tanıyabilir. Bu çalışma, alanındaki literatüre teknik bir katkı sağlarken, gelecekteki araştırmalar için yeni yollar açmaktadır.Thin-Walled Steel Tubular (TWST) Poles are a common structural type used across various industries. These poles are known for their strong, durable, and versatile structures. TWST poles can experience significant amplitude cyclic displacements and even failures due to vibrations caused by seismic activities, mechanical sources, and particularly meteorological events. To enhance the service life of TWST poles and the performance of the equipment mounted on them, these poles must be protected from excessive vibrations through appropriate measures under various service loads. This study investigates the performance of passive pendulum tuned mass dampers (P-TMDs) mounted on TWST poles through comprehensive experimental and numerical analysis. Free vibration tests were conducted on TWST poles with and without P-TMDs, with excitations at 10 kg, 20 kg, and 30 kg loads, and three different initial displacement amplitudes were used. Dynamic performances were evaluated through operational modal analysis (OMA) techniques based on displacement and acceleration responses. Subsequently, the free vibration behavior of TWST poles was simulated using finite element (FE) models, and the parameters predicted by the FE model were compared with the measured performance parameters. The results of this study demonstrate that the use of P-TMDs can significantly improve the dynamic responses of TWST poles. These findings may contribute to the development of structural safety standards in seismic regions and other high-risk areas. Additionally, the integration of P-TMDs in engineering applications may enable these structures to become more reliable with longer service lives and lower maintenance costs. This study not only makes a technical contribution to literature but also opens new avenues for future research
İSPANYOLCA DERS KİTAPLARININ KÜLTÜREL AKTARIM ÖGELERİ BAKIMINDAN İNCELENMESİ: AULA INTERNACIONAL 1 ÖRNEĞİ
No full textBir dil ile o dili konuşan toplumların kültürü arasında yakın ilişki vardır. Yabancı dil öğrenme ve öğretim süreçlerinde de dil ile kültür arasındaki ilişkiyi yok saymak mümkün değildir. Bu nedenle yabancı dil öğretimine yönelik olarak hazırlanan ders materyallerinde de kültürel ögeler bulunmaktadır. Bu çalışmada İspanyolca ders kitapları kültürel aktarım ögeleri bakımından incelenmesi amaçlanmıştır. Hem ülkemizde hem de dünyada yaygın olarak kullanılması nedeniyle araştırma evrenini temsil gücünün yüksek olduğu göz önünde bulundurularak yabancı dil olarak İspanyolca öğretimine yönelik hazırlanmış olan Aula Internacional 1 adlı ders kitabı çalışmada örneklem olarak kullanılmıştır. Söz konusu İspanyolca ders kitabı, Diller İçin Avrupa Ortak Öneriler Çerçevesi’nde yer alan kültürel konular ile hedef, kaynak ve uluslararası kültür ögeleri bakımından ele alınmıştır. Aula Internacional 1 adlı İspanyolca ders kitabından alınıp incelenmiş olan bölümler, çalışmanın amacı doğrultusunda amaçlı örneklemeye başvurularak seçilmiştir. Son olarak ilgili İspanyolca ders kitabından elde edilen veriler, nitel veri çözümleme yöntemlerinden betimsel analiz yoluyla işlenmiştir
The Relationship Between Perceived Maternal Narcissism and Attitudes Toward Seeking Psychological Help : Mediating Roles of Self-Efficacy and Self-Esteem
No full textBu çalışmada, anneden algılanan narsisistik özellikler ile psikolojik yardım aramaya yönelik tutum arasındaki ilişkide öz-yeterlik ve öz-saygının aracı rollerinin incelenmesi amaçlanmıştır. Araştırmanın örneklemi uygun örnekleme yöntemi ile oluşturulmuş ve araştırmaya katılım sırasında herhangi bir ruh sağlığı hizmeti almayan 18-63 yaş aralığındaki 319 katılımcı örnekleme dahil edilmiştir. Bu çalışmada veriler Sosyo-demografik Bilgi Formu, Anneden Algılanan Narsisistik Özellikler Ölçeği, Genel Öz-Yeterlik Ölçeği, Rosenberg Benlik Saygısı Ölçeği, Psikolojik Yardım Aramaya Yönelik Tutum Ölçeği-Kısaltılmış Form ile toplanmıştır. Çalışmanın veri analizi seri çoklu aracı değişken analizi ile yürütülmüştür. Analiz sonucunda, öz-yeterlik ve öz-saygının anneden algılanan narsisistik özellikler ile psikolojik yardım aramaya ilişkin tutum arasındaki ilişkide seri aracılık etmediği bulunmuştur. Bununla birlikte öz-yeterliğin anneden algılanan narsisistik özellikler ile psikolojik yardım aramaya ilişkin tutum arasındaki ilişkide aracılık etmediği fakat öz-saygının bu ilişkide kısmi aracı rol oynadığını görülmüştür. Çalışma bulguları alanyazındaki bulgular kapsamında tartışılmıştır.In the current study, the aim was to investigate the roles of self-efficacy and self-esteem in the relationship between perceived maternal narcissism and attitudes toward seeking psychological help (ATSPH). The sample of the study was constructed with the convenience sampling method, and 319 participants between the ages of 18-63 who did not receive any mental health services at the time of participation in the study were included in the sample. In this study, data were collected using the Socio-demographic Information Form, the Perceived Maternal Narcissism Scale, the General Self-Efficacy Scale, the Rosenberg Self-Esteem Scale and the Attitudes Toward Seeking Psychological Help Scale-Shortened, respectively. The data of the study were analyzed using serial mediation analysis. The results indicated that self-efficacy and self-esteem did not serially mediate the relationship between perceived maternal narcissism and ATSPH. Also, it has been found that self-efficacy did not mediate the relationship between perceived maternal narcissism and ATSPH, but self-esteem plays a partial mediating role in this relationship. The study findings were discussed within the scope of existing literature
Search for a Light CP-Odd Higgs Boson Decaying Into a Pair of τ-Leptons in Proton-Proton Collisions at √s = 13 TeV With the ATLAS Detector
No full textThis paper reports a search for a light CP-odd scalar resonance with a mass of 20 GeV to 90 GeV in 13 TeV proton-proton collision data with an integrated luminosity of 140 fb−1 collected with the ATLAS detector at the Large Hadron Collider. The analysis assumes the resonance is produced via gluon-gluon fusion and decays into a τ+τ− pair which subsequently decays into a fully leptonic μ+νμν¯τe−ν¯eντ or e+νeν¯τμ−ν¯μντ final state. No significant excess of events above the predicted Standard Model background is observed. The results are interpreted within a flavour-aligned two-Higgs-doublet model, and a model-independent cross-section interpretation is also given. Upper limits at 95% confidence level between 3.0 pb and 68 pb are set on the cross-section for producing a CP-odd Higgs boson that decays into a τ+τ− pair. © The Author(s) 2024.Ministerio de Ciencia, Innovación y Universidades, MCIU; Agencia Nacional de Investigación y Desarrollo; BSF-NSF; Australian Research Council, ARC; DRAC; La Caixa Banking Foundation; Centre National pour la Recherche Scientifique et Technique, CNRST; NAWA; Center for African Studies, CAS; Fundação para a Ciência e a Tecnologia, FCT; European Union, Future Artificial Intelligence Research; European Organization for Nuclear Research; Polish National Science Centre; Georgia Health Initiative, HGF; National Science Foundation, NSF; Baden-Württemberg Stiftung; Science and Technology Facilities Council, STFC; Horizon 2020, ICSC-NextGenerationEU; Nederlandse Organisatie voor Wetenschappelijk Onderzoek, NWO; Ministry of Science and Innovation; Istituto Nazionale di Fisica Nucleare; Ministry of Science and Higher Education; Japan Society for the Promotion of Science; MVZI; PROMETEO; Spine Education and Research Institute, SERI; IDUB AGH; Ministry of Education Youth and Sports; Neubauer Family Foundation; Bundesministerium für Wissenschaft, Forschung und Wirtschaft, BMWFW; Austrian Science Fund, FFWF; BCKDF; Yerevan Physics Institute; ERDF; Agencia Nacional de Investigación y Desarrollo, ANID; Bundesministerium für Bildung und Forschung, BMBF; Slovenian Research Agency; Canada Foundation for Innovation, FCI; Danmarks Grundforskningsfond, DNRF; Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq; Göran Gustafssons Stiftelse; Generalitat de Catalunya; U.S. Department of Energy, USADOE; EU-ESF; COST; CRC; Generalitat Valenciana; RGC; Duchenne Research Fund, DRF; Netherlands Organisation for Scientific Research; Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP; PRIMUS; Agencia Estatal de Investigación, AEI; Islamic Scholarship Fund, ISF; ICSC; ANR; Institutul de Fizică Atomică, IFA; Ministry of Science and Technology of the People's Republic of China, MOST; Natural Sciences and Engineering Research Council of Canada, CRSNG; Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science; GenT Programmes Generalitat Valenciana, Spain; Marie Skłodowska-Curie Actions; National Science and Technology Council, NSTC; EU; MINERVA, Israel; Irish Rugby Football Union, IRFU; Cantons of Bern and Geneva; Defence Science Institute, DSI; Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, FNS; MSTDI; MNE; Agencia Nacional de Promoción Científica y Tecnológica, ANPCyT; Marcus och Amalia Wallenbergs minnesfond, MMW; CERN-CZ; National Research Foundation, NRF; Ministerstwo Edukacji i Nauki, MNiSW; FAPERJ; European Research Council; CERN, CERN; Ministerstvo Školství, Mládeže a Tělovýchovy, MSMT; European Union; National Research Council Canada, NRC; Multiple Sclerosis Scientific Research Foundation, MSSRF; DFG; AvH Foundation; Istituto Nazionale di Fisica Nucleare, INFN; CANARIE; Ministry of Education, Culture, Sports, Science and Technology, MEXT; UK Research and Innovation, UKRI; FEDER, (IDIFEDER/2018/048); Leverhulme Trust, (RPG-2020-004); FONDECYT, (1240864, 1230987, 1230812); U.S. Department of Energy, (ECA DE-AC02-76SF00515); Czech Science Foundation, (GACR — 24-11373S); Carl Trygger Foundation, (CTS 22:2312); Swiss National Science Foundation, (SNSF — PCEFP2_194658); Ministero dell’Università e della Ricerca, (PRIN — 20223N7F8K — PNRR M4.C2.1.1); National Natural Science Foundation of China, NNSFC, (12275265, NSFC-12075060); National Natural Science Foundation of China, NNSFC; ERC, (948254, 101089007); Research Council of Norway, (RCN-314472); H2020 European Research Council, (ERC — 101002463); MCIN, (PCI2022-135018-2, PID2021-125273NB, RYC2020-030254-I, RYC2021-031273-I, RYC2022-038164-I, RYC2019-028510-I); DNSRC, (IN2P3-CNRS); Swedish Research Council, (VR 2018-00482, VR 2022-04683, 2021-03651, VR 2022-03845, VR 2023-03403, 2023-04654); Polish National Agency for Academic Exchange, (PPN/PPO/2020/1/00002/U/00001); FAIR-NextGenerationEU, (PE00000013); NCN, (UMO-2019/34/E/ST2/00393, 2023/51/B/ST2/02507, 2021/42/E/ST2/00350, UMO-2022/47/O/ST2/00148, H2020 MSCA 945339, 2022/47/B/ST2/03059, UMO-2020/37/B/ST2/01043, UMO-2023/51/B/ST2/00920, UMO-2021/40/C/ST2/00187, UMO-2023/49/B/ST2/04085); Chinese Ministry of Science and Technology, (MOST-2023YFA1605700); Agence Nationale de la Recherche, (ANR-20-CE31-0013, ANR-21-CE31-0013, ANR-22-EDIR-0002, ANR-21-CE31-0022); Deutsche Forschungsgemeinschaft, (DFG — CR 312/5-2, DFG — 469666862); National Natural Science Foundation of China, (NSFC — 12175119); FORTE, (CZ.02.01.01/00/22_008/0004632, PRIMUS/21/SCI/017); Japan Society for the Promotion of Science, JSPS, (JP22KK0227, JP22H04944, JP23KK0245, JP22H01227); Japan Society for the Promotion of Science, JSPS; Knut and Alice Wallenberg Foundation, (KAW 2018.0458, KAW 2019.0447, KAW 2022.0358); Center for Advancing Research Impact in Society, ARIS, (J1-3010); Center for Advancing Research Impact in Society, ARIS; Royal Society, (NIF-R1-231091
Optimized Amplitude Distributions for Grating and Side Lobe Suppression in Optical Phased Array Antennas
No full textThe Society of Photo-Optical Instrumentation Engineers (SPIE)Nanophotonics X 2024 -- 7 April 2024 through 12 April 2024 -- 200395Integrated optical phased arrays (OPAs) are important for various applications such as LIDAR, microscopy, wireless communication, and holography. Traditional one-dimensional N-element OPAs with individual phase shifters for varied steering angles often have emitter spacings that exceed half a wavelength, leading to grating lobes. Moreover, using true-time-delay lines with varied numbers of periods for different delays may cause amplitude inconsistencies and further side lobe elevation. The proposed partially apodised (PA) one-dimensional grating waveguide design controls amplitude while conserving the time delay for targeted steering angles, using distributions as Uniform to minimize grating and side lobes. We fabricated a four-element array with insertion losses of -3 dB for the PA version across the 1530-1580 nm wavelength band. © 2024 SPIE.2210A, 122E56
Non-EEG Method To Predict a Psychiatric Disorder and Proposed Preventive Method
No full textSocial anxiety disorder (SAD) involves an intense fear of social interactions, leading to distress and impaired daily functioning. This study aims to develop a wearable technology to predict and mitigate anxiety attacks in SAD patients using Photoplethysmogram (PPG) and Electrocardiogram (ECG) signals. The system analyzes data from 135 participants, using the Liebowitz scale and State-Trait Anxiety Inventory to select 30 individuals for detailed analysis. Key features from ECG and PPG signals were input into a Naive Bayes algorithm, achieving an 84.24% accuracy in predicting anxiety states. The system also provides sound and vibration stimuli to help calm patients, potentially improving their quality of life
Determinants of Unmet Need for Family Planning: Evidence From the 2018 Turkey Demographic and Health Survey
No full textUnmet need for family planning is a valuable concept to indicate the discrepancy between women's fertility preferences and contraceptive use. Unmet need may lead to unintended pregnancies and unsafe abortions. These may result in health deterioration and reduced employment opportunities for women. The 2018 Turkey Demographic and Health Survey report indicated that the estimated unmet need for family planning doubled from 2013 to 2018, returning to the high levels of the late 1990s. Considering this unfavourable change, this study aims to investigate the determinants of unmet need for family planning among married women of reproductive age in Turkey by using the 2018 Turkey Demographic and Health Survey data. Logit model estimations revealed that women who were at older ages, more educated, wealthier, and had more than one child were less likely to have unmet need for family planning. Employment statuses of women and their spouses and place of residence were significantly associated with unmet need. Results emphasised that training and counselling to enhance the use of family planning methods should effectively target young, less educated, and poor women
Measurement of i>t/I>-channel Production of Single Top Quarks and Antiquarks in i>pp/I> Collisions at 13 Tev Using the Full Atlas Run 2 Data Sample
No full textThe production of single top quarks and top antiquarks via the t-channel exchange of a virtual W boson is measured in proton-proton collisions at a centre-of-mass energy of 13TeV at the LHC using 140 fb(-1) of ATLAS data. The total cross-sections are determined to be sigma(tq) = 137(-8)(+8) pb and sigma((t) over barq) = 84(-5)(+6) pb for top-quark and top-antiquark production, respectively. The combined cross-section is found to be sigma(tq + (t) over barq) = 221(-13)(+13) pb and the cross-section ratio is R-t = sigma(tq)/sigma((t) over barq) = 1.636(-0.034)(+0.036). The predictions at next-to-next-to-leading-order in quantum chromodynamics are in good agreement with these measurements. The predicted value of R-t using different sets of parton distribution functions is compared with the measured value, demonstrating the potential to further constrain the functions when using this result in global fits. The measured cross-sections are interpreted in an effective field theory approach, setting limits at the 95% confidence level on the strength of a four-quark operator and an operator coupling the third quark generation to the Higgs boson doublet: -0.37 C-Qq(3,1)/Lambda(2) 0.06 and -0.87 C-phi Q(3)/Lambda(2) 1.42. The constraint vertical bar V-tb vertical bar > 0.95 at the 95% confidence level is derived from the measured value of sigma(tq + (t) over barq), assuming that the Wtb interaction is a left-handed weak coupling and that vertical bar V-tb vertical bar >> vertical bar V-td vertical bar, vertical bar V-ts vertical bar. In a more general approach, pairs of CKM matrix elements involving top quarks are simultaneously constrained, leading to confidence contours in the corresponding two-dimensional parameter spaces.The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF/SFU (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF Italy), NL-T1 (Netherlands), PIC (Spain), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in ref. [102]. We gratefully acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taipei; TENMAK, Turkiye; STFC, United Kingdom; DOE and NSF, United States of America. Individual groups and members have received support from BCKDF, CANARIE, CRC and DRAC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020, ICSC-NextGenerationEU and Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex, Investissements d'Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. In addition, individual members wish to acknowledge support from Chile: Agencia Nacional de Investigacion y Desarrollo (FONDECYT 1190886, FONDECYT 1210400, FONDECYT 1230987); China: National Natural Science Foundation of China (NSFC -12175119, NSFC 12275265); European Union: European Research Council (ERC 948254), Horizon 2020 Framework Programme (MUCCA -CHIST-ERA-19-XAI-00), Italian Center for High Performance Computing, Big Data and Quantum Computing (ICSC, NextGenerationEU), Marie Sklodowska-Curie Actions (EU H2020 MSC IF GRANT NO 101033496); France: Agence Nationale de la Recherche (ANR-20-CE31-0013, ANR-21CE31-0013, ANR-21-CE31-0022), Investissements d'Avenir Idex (ANR-11-LABX-0012), Investissements d'Avenir Labex (ANR-11-LABX-0012); Germany: Baden-Wurttemberg Stiftung (BW Stiftung-Postdoc Eliteprogramme), Deutsche Forschungsgemeinschaft (DFG CR 312/5-1); Italy: Istituto Nazionale di Fisica Nucleare (FELLINI G.A. n. 754496, ICSC, NextGenerationEU); Japan: Japan Society for the Promotion of Science (JSPS KAKENHI 22H01227, JSPS KAKENHI JP21H05085, JSPS KAKENHI JP22H04944); Netherlands: Netherlands Organisation for Scientific Research (NWO Veni 2020 -VI.Veni.202. 179); Norway: Research Council of Norway (RCN-314472); Poland: Polish National Agency for Academic Exchange (PPN/PPO/2020/1/00002/U/00001), Polish National Science Centre (NCN 2021/42/E/ST2/00350, NCN UMO-2019/34/E/ST2/00393, UMO-2020/37/B/ST2/01043, UMO-2021/40/C/ST2/00187); Slovenia: Slovenian Research Agency (ARIS grant J1-3010); Spain: BBVA Foundation (LEO22-1-603), Generalitat Valenciana (Artemisa, FEDER, IDIFEDER/2018/048), La Caixa Banking Foundation (LCF/BQ/PI20/11760025), Ministry of Science and Innovation (RYC2019-028510-I, RYC2020-030254-I), PROMETEO and GenT Programmes Generalitat Valenciana (CIDEGENT/2019/023, CIDEGENT/2019/027); Sweden: Swedish Research Council (VR 2022-03845, VR 2022-04683), Knut and Alice Wallenberg Foundation (KAW 2017.0100, KAW 2018.0157, KAW 2019.0447); Switzerland: Swiss National Science Foundation (SNSF -PCEFP2_194658); United Kingdom: Leverhulme Trust (Leverhulme Trust RPG-2020-004); United States of America: Neubauer Family Foundation.ANPCyT, Australia; YerPhI, Armenia; ARC, Australia; BMWFW, Austria; FWF, Austria; ANAS, Azerbaijan; CNPq, Brazil; FAPESP, Brazil; NSERC, Canada; NRC, Canada; CFI, Canada; CERN; ANID, Chile; CAS, China; MOS, China; NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF, Denmark; DNSRC, Denmark; IN2P3-CNRS, France; CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, Germany; HGF, Germany; MPG, Germany; GSRI, Greece; RGC, China; Hong Kong SAR, China; ISF, Israel; Benoziyo Center, Israel; INFN, Italy; MEXT, Japan; JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS, Slovenia; MIZS, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC, Sweden; Wallenberg Foundation, Sweden; SERI, Switzerland; SNSF , Switzerland; Canton of Bern, Switzerland; Canton of Geneva, Switzerland; MOST, Taipei; TENMAK, Turkiye; STFC, United Kingdom; DOE, United States of America; NSF, United States of America; BCKDF, Canada; CANARIE, Canada; CRC, Canada; DRAC, Canada; PRIMUS, Czech Republic [21/SCI/017]; UNCE, Czech Republic; COST, European Union; ERC, European Union; ERDF, European Union; Horizon 2020, European Union; ICSC-NextGenerationEU, European Union; Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex, France; Investissements d'Avenir Idex, France; ANR, France; DFG, Germany; AvH Foundation, Germany; Herakleitos programme - EU-ESF, Greece; Thales programme - EU-ESF, Greece; Aristeia programme - EU-ESF, Greece; BSF-NSF, Israel; MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN, Poland; NAWA, Poland; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO Programme Generalitat de Catalunya, Spain; GenT Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society, Leverhulme Trust; Leverhulme Trust, United Kingdom; Agencia Nacional de Investigacion y Desarrollo [FONDECYT 1190886, FONDECYT 1210400]; National Natural Science Foundation of China [NSFC -12175119, NSFC 12275265]; EU: H2020 European Research Council [H2020-MSCA-IF-2020: HPOFHIC -10103]; European Union: European Research Council [ERC -948254]; Horizon 2020 Framework Programme [MUCCA -CHIST-ERA-19-XAI-00]; Italian Center for High Performance Computing, Big Data and Quantum Computing (ICSC, NextGenerationEU); Marie Sklodowska-Curie Actions (EU H2020 MSC IF GRANT) [101033496]; Agence Nationale de la Recherche [ANR-20-CE31-0013, ANR-21-CE31-0022]; Investissements d'Avenir Idex [ANR-11-LABX-0012]; Investissements d'Avenir Labex [ANR-11-LABX-0012]; Baden-Wurttemberg Stiftung (BW Stiftung-Postdoc Eliteprogramme); Deutsche Forschungsgemeinschaft [DFG -CR 312/5-1]; Istituto Nazionale di Fisica Nucleare (FELLINI) [754496]; Japan Society for the Promotion of Science [JSPS KAKENHI 22H01227, JSPS KAKENHI JP21H05085, JSPS KAKENHI JP22H04944]; Netherlands Organisation for Scientific Research [NWO Veni 2020 -VI.Veni.202.179]; Research Council of Norway [RCN-314472]; Polish National Agency for Academic Exchange [N/PPO/2020/1/00002/U/00001]; Polish National Science Centre [NCN 2021/42/E/ST2/00350, NCN UMO-2019/34/E/ST2/00393, UMO-2020/37/B/ST2/01043, UMO-2021/40/C/ST2/00187]; Slovenian Research Agency (ARIS grant) [J1-3010]; BBVA Foundation [LEO22-1-603]; Generalitat Valenciana (Artemisa, FEDER) [IDIFEDER/2018/048]; La Caixa Banking Foundation [LCF/BQ/PI20/11760025]; Ministry of Science and Innovation [RYC2019-028510-I, RYC2020-030254-I]; PROMETEO Programme Generalitat Valenciana [CIDEGENT/2019/023, CIDEGENT/2019/027]; GenT Programme Generalitat Valenciana [CIDEGENT/2019/023, CIDEGENT/2019/027]; Swedish Research Council [VR 2022-03845]; Knut and Alice Wallenberg Foundation [KAW 2017.0100, KAW 2018.0157, KAW 2019.0447]; Swiss National Science Foundation [SNSF -PCEFP2_194658]; Leverhulme Trust [RPG-2020-004
Computed Tomography System Performance for Different Iterative Reconstruction Algorithms
No full textThe number of the Computed Tomography (CT) examinations has increased greatly over the past decade; This has made CT doses the largest source of the individual effective dose from medical exposures worldwide. Evaluation of image quality in CT is an important issue to ensure diagnostic accuracy, while keeping the radiation dose especially to the pediatric patient as low as reasonably possible. The purpose of this study was to assess the physical and psychophysical image quality in pediatric CT for different iterative reconstruction (IR) algorithms. The image quality was measured on each CT system using pediatric QRM abdomen and thorax phantoms for clinical thorax and abdomen examination scanning parameters and using the Catphan 600 phantom for head examination scanning parameters. The performance of each CT systems was evaluated individually using conventional filtered back-projection (FBP) and IR algorithm employed in that system. Noise, contrast-to-noise ratio (CNR), inverse image quality figure (IQFinv), modulation transfer function (MTF) and noise power spectrum (NPS) were assessed for FBP and wide range of iteration level of different IR algorithms. Figure of Merit (FOM) parameter was calculated to characterize the dose efficiency of each CT system. The CTDIvol values were changed from 20.6 to 45.7, 0.9 to 7.4 and 2.4–9.6 mGy for pediatric head, thorax and abdomen scanning protocols between CT systems, respectively. With increasing iteration level, image noise decreased while CNR and IQFinv increased. NPS peak was decreased with increasing iteration level for both two (2D) and three dimensional (3D) NPS and the ratio of the 3D NPS to 2D NPS varied from 4.5 to 8.3 for pediatric head, from 4.6 to 8.7 for pediatric thorax and from 4.0 to 14.0 for pediatric abdomen scanning protocols. For all IR algorithms employed with CT systems used in this study, the FOM values were increased with increasing iteration level. © 2024 Elsevier LtdTürkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK: 122F015; Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTA
COVID-19 Salgınında Türkiye’de Stres, Yalnızlık ve Önlemlere Uyum: COVIDiSTRESS Küresel Çalışması Bulguları
No full textKoronavirüs hastalığının (COVID-19) neden olduğu salgın tüm dünyada önemli bir kriz haline gelmiştir ve bireylerin hem fiziksel hem psikolojik iyilik haline bir tehdit olmayı sürdürmektedir. COVIDiSTRESS Küresel Çalışması 39 ülkeden araştırmacıların dahil olduğu bir açık bilim girişimidir ve insanların salgın sırasındaki deneyimlerine odaklanmıştır. Bu çalışmada, 30 Mart-30 Mayıs 2020 tarihleri arasında COVIDiSTRESS Küresel Çalışmasına Türkiye’den katılan 766 kişinin verisi kullanılarak stres, yalnızlık ve koruyucu önlemlere uyum ile ilişkili etkenlerin belirlenmesi hedeflenmiştir. Çalışmanın bulguları algılanan stres, yalnızlık ve önlemlere uyum davranışlarının sosyodemografik özellikler, duygusal dengesizlik ve dışa dönüklük, salgına yönelik endişeler, stres verici etkenler ve stres kaynakları ile başa çıkma/rahatsızlığı azaltmayla ilişkili olduğunu göstermiştir. Bu bulgular belirli duygusal, bilişsel ve davranışsal sonuçlar için olası risk etkenleri ve koruyucu etkenlere yönelik bilgi sağlamaktadır. Ayrıca bu bulgular salgın sırasında ya da sonrasında psikolojik iyilik halini artırmaya yönelik önleme ve/veya müdahale programlarının geliştirilmesine katkı sağlayabilir. Bireylere ve hükümete/sağlık sistemine güven ve sosyal desteğin ise bu ilişkilerde aracı rolünün anlamlı olduğu bulunmuştur. Bu, güveni ve sosyal desteği artırmanın stresi, yalnızlığı azaltmaya ve koronavirüsün yayılmasını yavaşlatmaya yönelik önlemlere uyumu artırmaya yardımcı olabileceğini düşündürmektedir.The coronavirus disease (COVID-19) pandemic has become a significant crisis globally and poses threats to individuals’ physical and psychological well-being. The COVIDiSTRESS Global Survey is an open science initiative including researchers from 39 countries and has focused on human experience during the pandemic. This study aimed to identify factors associated with stress, loneliness, and compliance with preventive measures using data from 766 participants from Turkey included in the COVIDiSTRESS Global Survey between 30th March and 30th May 2020. This study showed that perceived stress, loneliness, and compliance to preventive measures were associated with sociodemographic factors, neuroticism, extraversion, concerns over the pandemic, stressors and sources of distress, and coping/decreasing discomfort. These findings provide information on possible risk and protective factors for specific emotional, cognitive, and behavioral outcomes. These may also guide the development of prevention and/or intervention programs for enhancing psychological well-being during or after the pandemic. In addition, trust in people and in government/health services, and social provisions significantly mediated these relationships. This suggests that fostering trust and availability of social support can reduce stress and loneliness and increase compliance to measures for curbing the spread of coronavirus