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    9778 research outputs found

    Microstrip Patch Antenna Design at 10 Ghz for X Band Applications

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    Microstrip patch antennas are used in satellite imaging systems, wireless communication equipment, military radios, GPS (Global Positioning System) and GSM (Global System for Mobile Communications) applications. Its advantages are its small size and light weight, thin structure, low power consumption, use in dual frequency applications, and patching in various geometric shapes. Developing technology has facilitated and accelerated the production of microstrip antennas. In this study, microstrip antenna design operating at 10 GHz frequency for X band applications has been made. X band is used for air traffic control, weather traffic control, vessel traffic control, defense tracking and vehicle speed detection, terrestrial communications and networking, space communications and amateur radio. HFSS program was used in antenna design. AWR program was used to find transmission line parameters. In addition, MATLAB program was used to calculate some parameters. First of all, information is given about the working principle of the antenna, the selected dielectric layer and the working frequency. Schematic drawings of the designed antenna were made from above and from the side. S11 reflection coefficient magnitude graphs are drawn below and above the operating frequency. The radiation pattern is drawn for the E-plane and H-plane at the operating frequency. 3-D (dimensional) plot of antenna gain at operating frequency is drawn. The simulations performed have shown that the designed antenna works successfully

    Tooth Tip Interference and Stress Analysis of High Contact Ratio Spur Gear Pairs Using an Optimized Design Tool

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    Gears are structural elements that function to transmit power in mechanical systems. The power transmission is carried out by the rolling motion of the teeth pair. The average number of teeth that come into contact while the gears are running is called the contact ratio and this value is generally between 1 and 2 for gears with standard profile. As the number of teeth of the gear increases, the contact ratio may exceed 2, and the gears with a contact ratio greater than 2 are called high contact ratio (HCR) gears. For HCR gears, there is a higher risk of tooth tip interference when compared to the standard gears and they require contact point calculation to avoid interference. In this study, a mathematical tool is developed using MATLAB to analyze and avoid tool tip interference in HCR spur gears. The addendum diameter, dedendum diameter, pressure angle and modulus values are optimized using the developed mathematical tool in order to obtain an HCR geometry with minimal volume and no tip interference. In addition, the spur gear stresses are calculated using the AGMA standards. According to the results, it has been analytically proven that the load carrying capacity of the HCR spur gear is higher than that of the standard gear with the same diameter and volume. The developed optimization tool provided accurate and optimized geometries for the analyzed HCR spur gears

    Measurements of the Production Cross-Section for a i>z/I> Boson in Association With i>b/I>- or i>c/I>-jets in Proton-Proton Collisions at √i>s/I>=13 Tev With the Atlas Detector

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    Merlassino, Claudia/0000-0002-5445-5938; Laurier, Alexandre/0000-0002-2575-0743; Sfyrla, Anna/0000-0002-3003-9905; Escalier, Marc/0000-0003-4270-2775; Zorbas, Theodore Georgio/0000-0003-2073-4901; Longarini, Iacopo/0000-0002-0352-2854; Walder, James/0000-0002-9039-8758; Nasri, Salah/0000-0002-5985-4567; Alhroob, Muhammad/0000-0001-7569-7111; Gustavino, Giuliano/0000-0002-5938-4921; Pilkington, Andrew/0000-0001-8007-0778; jia, Jiangyong/0000-0002-5725-3397; Simsek, Sinem/0000-0002-9650-3846; Zakharchuk, Nataliia/0000-0002-4963-8836; Allport, Philip/0000-0001-7303-2570; Pham, Thu LH/0000-0002-8859-1313; Poveda, Joaquin/0000-0001-8144-1964; Gonnella, Francesco/0000-0003-0885-1654; Che, Yimin/0000-0001-6623-1205; Dunne, Katherine/0000-0003-2626-2247; Han, Kunlin/0000-0002-1627-4810; Shabalina, Elizaveta/0000-0003-4849-556X; Kennedy, Philip David/0000-0002-8491-2570; Little, Jared/0000-0002-9372-0730; Proklova, Nadezda/0000-0002-5237-0201; Hugging, Fabian/0000-0002-7472-3151; Lloyd, Stephen/0000-0002-5073-2264; Moenig, Klaus/0000-0002-3169-7117; Cooper-Sarkar, Amanda/0000-0002-7107-5902; Nobe, Takuya/0000-0002-5809-325X; Carmignani, Joseph (Joe)/0000-0002-1705-1061; Mancini, Giada/0000-0001-6158-2751; Delsart, Pierre-Antoine/0000-0002-9556-2924; Falda Coelho, Luis Felipe/0000-0002-2298-3605; Saibel, Andrej/0000-0002-9932-7622; Mlinarevic, Marin/0000-0003-3587-646X; Sioli, Maximiliano/0000-0002-0912-9121; Calafiura, Paolo/0000-0002-1692-1678; Cabrera Urban, Susana/0000-0001-7640-7913; LeBlanc, Matt/0000-0001-5977-6418; Liu, Xinyan/0000-0003-1890-2275; Chudoba, Jiri/0000-0002-6425-2579; Chan, Jay/0000-0001-7069-0295; Hirose, Shigeki/0000-0002-2389-1286; gabrielli, andrea/0000-0003-0768-9325; Zhang, Dengfeng/0000-0001-7335-4983; Buckley, Andy/0000-0001-8355-9237; Kharlamova, Tatyana/0000-0002-0387-6804; Arguin, Jean-Francois/0000-0003-0229-3858; Gutierrez Zagazeta, Luis Felipe/0000-0003-0374-1595; Jones, Eleanor/0000-0001-6289-2292; Bachas, Konstantinos/0000-0002-9047-6517; Adamczyk, Leszek/0000-0002-5859-2075; 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Zhang, Zhuolin/0000-0002-7936-8419; Astalos, Robert/0000-0001-5095-605X; Wu, Sau Lan/0000-0001-5866-1504; Argyropoulos, Spyridon/0000-0001-7748-1429; Valente, Marco/0000-0002-0486-9569; Cristoforetti, Marco/0000-0002-0127-1342; Flores Castillo, Luis Roberto/0000-0003-1551-5974; Alimonti, Gianluca/0000-0002-7128-9046; Giuli, Francesco/0000-0002-8506-274X; Lopez Solis, Alvaro/0000-0002-0511-4766; Zerradi, Soufiane/0000-0001-9101-3226; de Vivie, Jean-Baptiste/0000-0001-9163-2211; D'Auria, Saverio/0000-0003-3393-6318; Schoeffel, Laurent/0000-0002-8081-2353; Primavera, Margherita/0000-0002-6866-3818; Giordani, Mario/0000-0002-0792-6039; Vittori, Camilla/0000-0001-9156-970X; DA FONSECA PINTO, JOAO VICTOR/0000-0003-1746-1914; SOUMAIMI, Zainab/0000-0002-8120-478X; Vukotic, Ilija/0000-0003-0472-3516; Romano, Marino/0000-0002-6609-7250; Manzoni, Stefano/0000-0002-2488-0511; Liu, Mingyi/0000-0002-0236-5404; Dabrowski, Wladyslaw/0000-0001-9061-9568; Faltova, Jana/0000-0003-4278-7182; Yorita, Kohei/0000-0003-1988-8401; CETIN, SERKANT ALI/0000-0001-5050-8441; Lee, Suhyun/0000-0003-0836-416X; Konstantinidis, Nikolaos/0000-0002-4140-6360; Benjamin, TROCME/0000-0001-9500-2487; McPherson, Robert/0000-0001-9211-7019; Arling, Jan-Hendrik/0000-0002-1577-5090; Morii, Masahiro/0000-0001-9324-057X; Todorova, Sarka/0000-0003-2433-231X; Moreno Llacer, Maria/0000-0003-1113-3645; Bona, Marcella/0000-0002-9660-580X; Vos, Marcel/0000-0001-8474-5357; D'Uffizi, Matteo/0000-0003-2499-1649; White, Martin/0000-0001-5474-4580; Sawyer, Craig/0000-0002-2027-1428; Kaczmarska, Anna/0000-0002-8880-4120; Cueto Gomez, Ana Rosario/0000-0003-1494-7898; Garcia Navarro, Jose Enrique/0000-0002-0279-0523; Ricci, Ester/0000-0002-4222-9976; Leight, William/0000-0002-2968-7841; Ragusa, Francesco/0000-0002-4064-0489; Shapiro, Marjorie/0000-0001-8540-9654; Cadamuro, Luca/0000-0001-8789-610X; Teixeira-Dias, Pedro/0000-0001-9977-3836; Valero, Alberto/0000-0002-9776-5880; HADEF, Asma/0000-0003-2508-0628; Gee, Carolyn/0000-0002-3271-7861; Kortman, Bryan Alexander/0000-0001-7081-3275; Wolter, Marcin/0000-0001-9184-2921; Balek, Petr/0000-0002-0942-1966; Korcyl, Krzysztof/0000-0001-8085-4505; Sommer, Philip/0000-0003-1703-7304; Padilla, Cristobal/0000-0001-7951-0166; Windischhofer, Philipp/0000-0001-5038-1399; Mete, Alaettin Serhan/0000-0002-5508-530X; Bachacou, Henri/0000-0002-2256-4515; Nikolopoulos, Konstantinos/0000-0002-3048-489X; Karpova, Zoya/0000-0003-0254-4629; Duckeck, Guenter/0000-0002-7756-7801; Nayak, Ranjit/0000-0001-6988-0606; Kroll, Jiri/0000-0001-6215-3326; Dinu, Ioan-Mihail/0000-0002-2683-7349; Mitsou, Vasiliki A./0000-0002-1533-8886; Davidek, Tomas/0000-0002-3770-8307; Mungo, Davide Pietro/0000-0002-2567-7857; Avolio, Giuseppe/0000-0003-2664-3437; Sala, Alessandro/0000-0003-0824-7326; Klein, Matthew Henry/0000-0002-9999-2534; Qian, Jianming/0000-0003-4813-8167; , Sascha/0000-0003-2941-2829; Schleicher, Katharina E./0000-0002-2917-7032; Snesarev, Andrei/0000-0002-9067-8362; Ran, Kunlin/0000-0003-3119-9924; Sinha, Supriya/0000-0002-3600-2804; Saimpert, Matthias/0000-0002-3765-1320; Moser, Brian/0000-0001-6750-5060; Wu, Yusheng/0000-0002-1528-4865; Tlou, Humphry/0000-0002-4934-1661; Bandyopadhyay, Anjishnu/0000-0002-5256-839X; Kumari, Neelam/0000-0001-9174-6200; Bassalat, Ahmed/0000-0002-0129-1423; Starovoitov, Pavel/0000-0003-1990-0992; Muller, Roman/0000-0002-5835-0690; Du, Dongshuo/0000-0002-6758-0113; Varvell, Kevin/0000-0003-1017-1295; Burghgrave, Blake/0000-0001-5686-0948; Duperrin, Arnaud/0000-0002-5789-9825; snyder, scott/0000-0001-8610-8423; van Daalen, Tal/0000-0002-2254-125X; Glasman, Claudia/0000-0003-2025-3817; KHWAIRA, Yahya/0000-0001-8538-1647; Aad, Georges/0000-0002-6665-4934; Metcalfe, Jessica/0000-0001-5454-3017; Weiser, Christian/0000-0002-6456-6834; Ali, Shahzad/0000-0001-5216-3133; Onyisi, Peter/0000-0003-4201-7997; Gramstad, Eirik/0000-0001-5792-5352; Winklmeier, Frank/0000-0001-8290-3200; Farrington, Sinead/0000-0001-5350-9271; Introzzi, Gianluca/0000-0002-1314-2580; van Vulpen, Ivo/0000-0001-7074-5655; Maeda, Junpei/0000-0002-9084-3305; Feligioni, Lorenzo/0000-0002-1403-0951; Nairz, Armin/0000-0003-3561-0880; Panizzo, Giancarlo/0000-0002-0352-4833; Maleev, Victor/0000-0003-1028-8602; Akesson, Torsten/0000-0003-4141-5408; Ince Lezki, Merve/0000-0001-6907-0195; Olivares, Sebastian/0000-0003-4616-6973; Komarek, Tomas/0000-0002-3047-3146; Roland, Christophe/0000-0003-2084-369X; Gonzalez Suarez, Rebeca/0000-0002-6126-7230; Sinha, Sukanya/0000-0002-2438-3785; Bahmani, Marzieh/0000-0003-4173-0926; Luehring, Frederick/0000-0001-8721-6901; Terashi, Koji/0000-0001-6520-8070; Scharf, Christian/0000-0002-0294-1205; Baldin, Evgenii/0000-0002-9854-975X; Santra, Arka/0000-0003-4644-2579; Terzo, Stefano/0000-0003-3388-3906; Saoucha, Kamal/0000-0001-9150-640X; Lie, Ki/0000-0002-5779-5989; Pleskot, Vojtech/0000-0001-5435-497X; Orestano, Domizia/0000-0001-5103-5527; Kock, Daniela/0000-0002-9090-5502; Francescato, Simone/0000-0001-5315-9275; Kretzschmar, Jan/0000-0002-8515-1355; Dong, Qichen/0000-0002-0117-7831; Villaplana Perez, Miguel/0000-0002-0048-4602; Fox, Harald/0000-0003-3089-6090; Vecchio, Valentina/0000-0002-1351-6757; Tsai, Fang-Ying/0000-0001-7878-6435; Kuze, Masahiro/0000-0001-8858-8440; Keeler, Richard/0000-0002-0510-4189; Zhang, Zhicai/0000-0002-1630-0986; Wenaus, Torre/0000-0002-8678-893X; Vranjes, Nenad/0000-0001-5415-5225; Principe Martin, Miguel Angel/0000-0002-5085-2717; Ebrahim, Abdualazem/0000-0002-5003-1919; Feng, Minyu/0000-0002-0698-1482; Thompson, Emily Anne/0000-0001-7050-8203; Dado, Tomas/0000-0002-7050-2669; CARRA, SONIA/0000-0001-8650-942X; Kono, Takanori/0000-0003-1553-2950; Grancagnolo, Sergio/0000-0001-8490-8304; Ezzarqtouni, Sanae/0000-0002-7912-2830; Iakovidis, George/0000-0002-0330-5921; Farooque, Trisha/0000-0003-1363-9324; De Sanctis, Umberto/0000-0003-4704-525X; Albert, Justin/0000-0003-0253-2505; Pascual Dominguez, Luis/0000-0003-4701-9481; Long, Jonathan David/0000-0002-2115-9382; Sharma, Abhishek/0000-0003-2250-4181; Chapon, Emilien/0000-0001-6968-9828; Mildner, Hannes/0000-0002-0384-6955; Barberio, Elisabetta/0000-0002-3111-0910; Zhang, Shuzhou/0000-0001-9039-9809; Kumar, Mukesh/0000-0003-3681-1588; Gurdasani, Simran Sunil/0000-0002-8836-0099; Mtintsilana, Onesimo/0000-0003-2168-4854; Xu, Lailin/0000-0001-8997-3199; Nemecek, Stanislav/0000-0001-8978-7150; Svatos, Michal/0000-0002-7199-3383; Shen, Qiuping/0000-0002-4085-1227; Franchini, Matteo/0000-0002-4554-252X; Thompson, Paul/0000-0002-6239-7715; Petersen, Troels/0000-0003-0221-3037; Leonidopoulos, Christos/0000-0002-7241-2114; Dimitriadi, Christina/0000-0002-9605-3558; Sebastiani, Cristiano/0000-0003-1073-035X; van Gemmeren, Peter/0000-0002-7227-4006; Kiryunin, Andrey/0000-0001-7490-6890; Barreiro, Fernando/0000-0002-3021-0258; Mohapatra, Soumya/0000-0003-3006-6337; Lipniacka, Anna/0000-0002-8759-8564; Heim, Sarah/0000-0002-2639-6571; Filthaut, Frank/0000-0003-3338-2247; Dao, Valerio/0000-0003-1645-8393; Dyndal, Mateusz/0000-0001-9632-6352; Yuan, Man/0000-0002-0991-5026; Taylor, Wendy/0000-0002-6596-9125; Cunha Sargedas Sousa, Mario Jose/0000-0001-7991-593X; Reznicek, Pavel/0000-0003-4017-9829; Vazquez Schroeder, Tamara/0000-0002-9780-099X; Kay, Ellis/0000-0002-6304-3230; Hill, Ewan/0000-0002-1725-7414; Gonski, Julia/0000-0003-2037-6315; Wiedenmann, Werner/0000-0003-3605-3633; Fawcett, William/0000-0003-2596-8264; Gray, Heather/0000-0002-5293-4716; Evans, Levi/0000-0002-4333-5084; Li, Liang/0000-0001-6411-6107; Schramm, Steven/0000-0001-9031-6751; Stupak III, John/0000-0001-9610-0783; Artoni, Giacomo/0000-0002-3477-4499; Jiggins, Stephen/0000-0003-2906-1977; Leroy, Claude/0000-0003-3105-7045; Hoppesch, Matthew/0000-0002-7773-3654; Stevenson, Thomas/0000-0003-2399-8945; Maniatis, Ioannis/0000-0002-4362-0088; Roda, Chiara Maria/0000-0002-3020-4114; Lux, Adam/0000-0002-3025-3020; Lacasta, Carlos/0000-0002-2623-6252; Potter, Christina/0000-0002-9815-5208; Hillier, Stephen/0000-0002-7599-6469; Liu, Bi

    Motor-Based Application Process for Cerebral Visual Impairment-Related Questionnaires for School-Age Children With Cerebral Palsy

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    This study aims to examine the psychometric properties of questionnaires related to cerebral visual impairment (CVI) in school-age children with cerebral palsy (CP). Additionally, it proposes an application process based on motor functionality for occupational therapists. A total of 288 children with CP were recruited for the study and administered the CVI Motor Questionnaire (CVI-MQ). The children's daily visual performance was assessed using the CVI Inventory and the Functional Vision Questionnaire (FVQ) considering the children's ambulatory status. The FVQ and the two factors extracted from the CVI Inventory significantly predicted visual functioning. Specific questionnaires related to CVI, applied with gross motor function in mind, can be valuable tools for occupational therapists to assess daily visual performance

    Co-Sensitization of Copper Indium Gallium Disulfide and Indium Sulfide on Zinc Oxide Nanostructures: Effect of Morphology in Electrochemical Carbon Dioxide Reduction

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    Recent advances in nanoparticle materials can facilitate the electro-reduction of carbon dioxide (CO2) to form valuable products with high selectivity. Copper (Cu)-based electrodes are promising candidates to drive efficient and selective CO2 reduction. However, the application of Cu-based chalcopyrite semiconductors in the electrocatalytic reduction of CO2 is still limited. This study demonstrated that novel zinc oxide (ZnO)/copper indium gallium sulfide (CIGS)/indium sulfide (InS) heterojunction electrodes could be used in effective CO2 reduction for formic acid production. It has been determined that Faradaic efficiencies for formic acid production using ZnO nanowire (NW) and nanoflower (NF) structures vary due to structural and morphological differences. A ZnO NW/CIGS/InS heterojunction electrode resulted in the highest efficiency of 77.2% and 0.35 mA cm-2 of current density at a −0.24 V (vs. reversible hydrogen electrode) bias potential. Adding a ZTO intermediate layer by the spray pyrolysis method decreased the yield of formic acid and increased the yield of H2. Our work offers a new heterojunction electrode for efficient formic acid production via cost-effective and scalable CO2 reduction. © 2024 The Authors. Published by American Chemical Society.Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK: 118C551; Key Research and Development Projects of Shaanxi Province: 2024GH-YBXM-0

    Chatgpt Oftalmoloji Pratiğinde Faydalı Bir Araç Mıdır

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    Amaç: ChatGPT-3.5'in performansını göz hastalıkları alanında değerlendirmek, klinik vaka bazlı sorular ve çoktan seçmeli sorulara (ÇSS) verdiği yanıtların doğruluk oranını karşılaştırmaktır. Yöntem: Çalışmada OpenAI tarafından geliştirilen bir yapay zeka modeli olan ChatGPT-3.5 kullanıldı. Modelden, \"Ophthalmology Review: A Case-Study Approach\" kitabından 98 vaka bazlı soruya ve \"Review Questions in Ophthalmology\" kitabından 643 ÇSS'ye yanıt vermesi istendi. ChatGPT'nin cevapları kitaplarla karşılaştırıldı ve istatistiksel analizi yapıldı. Bulgular: ChatGPT, vaka bazlı sorularda genel olarak %56,1 doğruluk oranı gösterdi.. Doğruluk oranı kategoriler arasında en yüksek retina bölümünde (%69,5) ve en düşük travma bölümünde (%38,2) idi. ÇSS'de ChatGPT'nin genel doğruluk oranı %53,5 olarak gözlendi, bunların en düşüğü optik bölümünde (%32,6) ve en yükseği patoloji ve üveit bölümlerinde (%66,7 ve %63) idi. ChatGPT özellikle retina ve pediatrik oftalmoloji bölümlerindeki vaka bazlı sorularda ÇSS’ye kıyasla daha iyi performans gösterdi. Sonuç: ChatGPT-3.5, özellikle retina ve pediatrik oftalmoloji alanlarında göz hastalıkları için potansiyel bir yardımcı araç olarak görülmektedir. ChatGPT'nin açık uçlu sorular için netlik ve kabul edilebilirliğini değerlendirmek için daha fazla araştırma yapılması gerekmektedir

    Parametric Channel Estimation for RIS-Assisted Wideband Systems

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    A reconfigurable intelligent surface (RIS) alters the reflection of incoming signals based on the phase-shift configuration assigned to its elements. This feature can be used to improve the signal strength for user equipments (UEs), expand coverage, and enhance spectral efficiency in wideband communication systems. Having accurate channel state information (CSI) is indispensable to realize the full potential of RIS-aided wideband systems. Unfortunately, CSI is challenging to acquire due to the passive nature of the RIS elements, which cannot perform transmit/receive signal processing. Recently, a parametric maximum likelihood (ML) channel estimator has been developed and demonstrated excellent estimation accuracy. However, this estimator is designed for narrowband systems with no non-line-of-sight (NLOS) paths. In this paper, we develop a novel parametric ML channel estimator for RIS-assisted wideband systems, which can handle line-of-sight (LOS) paths in the base station (BS)-RIS and RIS-UE links as well as NLOS paths between the UE, BS, and RIS. We leverage the reduced subspace representation induced by the array geometry to suppress noise in unused dimensions, enabling accurate estimation of the NLOS paths. Our proposed algorithm demonstrates superior estimation performance for the BS-UE and RIS-UE channels, outperforming the existing ML channel estimator.Swedish Foundation for Strategic Research [FFL18-0277]This work was supported by the FFL18-0277 grant from the Swedish Foundation for Strategic Research

    Differential Cross-Section Measurements of the Production of Four Charged Leptons in Association With Two Jets Using the Atlas Detector

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    Differential cross-sections are measured for the production of four charged leptons in association with two jets. These measurements are sensitive to final states in which the jets are produced via the strong interaction as well as to the purely-electroweak vector boson scattering process. The analysis is performed using proton-proton collision data collected by ATLAS at root s = 13TeV and with an integrated luminosity of 140 fb(-1). The data are corrected for the effects of detector inefficiency and resolution and are compared to stateof-the-art Monte Carlo event generator predictions. The differential cross-sections are used to search for anomalous weak-boson self-interactions that are induced by dimension-six and dimension-eight operators in Standard Model effective field theory.ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW; FWF, Austria; ANAS; CNPq; FAPESP, Brazil; NSERC; CFI, Canada; NSFC, China; MEYS CR, Czech Republic; DNRF; DNSRC, Denmark; IN2P3-CNRS; CEA-DRF/IRFU, France; BMBF; MPG, Germany; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT; JSPS, Japan; CNRST, Morocco; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS; MIZS, Slovenia; MICINN, Spain; Wallenberg Foundation, Sweden; SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; DOE; NSF, United States of America; BCKDF; CANARIE; CRC, Canada [PRIMUS 21/SCI/017, UNCE SCI/013]; Czech Republic; ERC; ERDF; Marie Skodowska-Curie Actions, European Union; Investissements d'Avenir Labex, Investissements d'Avenir Idex; ANR, France; DFG; AvH Foundation, Germany - EU-ESF; Greek NSRF, Greece; BSF-NSF; NCN; La Caixa Banking Foundation; CERCA Programme Generalitat de Catalunya; PROMETEO; Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society; Leverhulme Trust, United Kingdom; NWO, Netherlands; Azerbaijan; CERN; ANID, Chile; CAS, MOST; Minciencias, Colombia; SRNSFG, Georgia; HGF; GSRI; Benoziyo Center, Israel; ISF; SPS, Japan; Royal Society and Leverhulme Trust, United Kingdom; CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, SpainWe 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, Taiwan; TENMAK, Turkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020 and Marie Skodowska-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

    Evidence for the Higgs Boson Decay To a Z Boson and a Photon at the Lhc

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    The first evidence for the Higgs boson decay to a Formula Presented boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around Formula Presented for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is Formula Presented times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations. © 2024 CERN, for the ATLAS and CMSs Collaboration

    2B Organik-İnorganik Hibrit Perovskit Geçiş Metali Dikalkojenit Heteroyapılı Optik Soğurma Tabakalarının Geliştirilmesi

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    Developing high-performance photodetectors with a p-n diode structure involves selecting suitable semiconductor materials as absorption layers and enhancing their properties, which is a key focus area. Particularly in recent years, two-dimensional (2D) organic-inorganic hybrid perovskites (OHPs) and transition metal dichalcogenides (TMDs) have gained great attention for use in diode structures due to their superior optical and electronic properties. Although some studies in the literature have attempted to reveal the underlying photophysical processes in various p-n OHP/TMD heterostructures, there are still inconsistencies and processes that have not been explained yet in detail. Within the scope of this thesis, BA2MAPb2I7/MoS2, BA2PbBr4/MoS2 and BA2PbI4/MoS2 heterostructures were produced for the first time, and systematic measurements were carried out to investigate the photophysical processes. Bulk 2D RP OHP and monolayer MoS2 single crystals were first synthesized using solution-based crystal growth and chemical vapor deposition (CVD) techniques, respectively. Studies were also carried out on the synthesis of a monolayer MoS2 film with a large surface area of the order of millimeters using the glass-assisted CVD approach. 2D RP OHP single crystals with low thicknesses on the order of tens of nanometers were produced on SiO2/Si surfaces via mechanical exfoliation. The OHP/MoS2 heterostructures were formed by transferring low-thickness perovskite single crystals onto monolayer MoS2 using the polymer-based PPC/PDMS stamping method. The PL intensity of perovskite within the junction region of the produced BA2MAPb2I7/MoS2 heterostructures is notably lower, by several times, compared to outside the junction. Furthermore, it has been observed that the PL intensity of MoS2 within the junction region of the produced BA2PbBr4/MoS2 and BA2PbI4/MoS2 heterostructures is significantly lower compared to outside the junction. These observations lead to the conclusion that the produced heterostructures exhibit characteristics of a type-II heterojunction configuration. In the BA2MAPb2I7/MoS2 heterostructures, the PL intensity of the perovskite layer diminishes notably due to the quenching effect resulting from charge transfer. Particularly within the heterostructure region, the redshift of the PL peak from a 678 nm wavelength to 682 nm indicates the prevalence of negative trions in the MoS2 emission spectrum, providing evidence of charge transfer within the heterostructure. Additionally, the variation in photophysical processes based on the thickness of the perovskite layer was investigated. It was observed that as the thickness decreases below 10 nm, the PL quenching effect increases significantly, nearly extinguishing the entire PL spectrum of the perovskite layer. This is attributed to the weakening of the charge transfer process with increasing thickness, due to the photon recycling effect. On the contrary, in some heterostructures, a significant increase in PL intensity, up to 8 times, was observed. This increase is speculated to be due to energy transfer. Furthermore, the presence of the interlayer exciton (IX) emission spectrum in the BA2PbBr4/MoS2 and BA2PbI4/MoS2 heterostructures was investigated and was not observed within the 532-1950 nm wavelength range. Moreover, akin to BA2MAPb2I7/MoS2 heterostructures, a notable increase, up to 12 times, in the PL quenching in the MoS2 emission spectrum was observed with decreasing thickness of the perovskite layer in BA2PbBr4/MoS2 and BA2PbI4/MoS2 heterostructures.P-n diyot yapısına sahip yüksek performanslı fotodedektör uygulamalarının geliştirilmesi için absorpsiyon katmanı olarak uygun yarıiletken malzemelerin seçilmesi ve bunların özelliklerinin geliştirilmesi gerekmektedir. Özellikle son yıllarda iki boyutlu (2B) organik-inorganik hibrit perovskit (OHP) tek kristal ve geçiş metali dikalkojenitler (TMD) üstün optik ve elektronik özelliklere sahip olmalarından dolayı diyot uygulamalarında öne çıkmaktadırlar. Fakat literatürde yer alan çalışmalarda çeşitli p-n diyot yapısına sahip OHP/TMD heteroyapılarında gerçekleşen fotofiziksel süreçler detaylı şekilde ortaya konulmaya çalışılsa da, hala bu bilgiler arasında uyumsuzluklar olmakla beraber henüz açıklanamayan süreçler de bulunmaktadır. Bu tez kapsamında, BA2MAPb2I7/MoS2, BA2PbBr4/MoS2 ve BA2PbI4/MoS2 heteroyapılar ilk defa üretilmiş ve fotofiziksel süreçlerin incelenmesi için sistematik ölçümler gerçekleştirilmiştir. Öncelikle yığın 2B RP OHP ve tek katmanlı MoS2 tek kristalleri sırasıyla, çözelti bazlı kristal büyütme ve kimyasal buhar biriktirme (CVD) yöntemleri kullanılarak sentezlenmiştir. Ayrıca, milimetreler mertebesinde geniş yüzey alanına sahip tek katmanlı MoS2 filmin cam destekli CVD yaklaşımı kullanılarak sentezlenmesi üzerine çalışmalar yürütülmüştür. Ardından mekanik eksfoliasyon yöntemi kullanılarak, SiO2/Si alttaş yüzeyinde onlarca nanometre mertebesinde düşük kalınlıklara sahip 2B RP OHP tek kristaller üretilmiştir. Düşük kalınlıklardaki tek kristaller, polimer bazlı PPC/PDMS damga yöntemiyle tek katmanlı MoS2 üzerine transfer edilerek heteroyapılar oluşturulmuştur. Buna göre, üretilen BA2MAPb2I7/MoS2 heteroyapılardaki perovskit PL yoğunluğu, heteroyapı bölgesinin dışındaki perovskit PL yoğunluğuna kıyasla birkaç kata kadar önemli ölçüde daha düşüktür. Ek olarak, BA2PbBr4/MoS2 ve BA2PbI4/MoS2 heteroyapılarında MoS2 PL yoğunluğunun, heteroyapı bölgesinin dışındaki MoS2 PL yoğunluğuna kıyasla birkaç kata kadar önemli ölçüde daha düşük olduğu gözlemlenmiştir. Bundan dolayı, üretilen heteroyapıların tip-II heteroeklem konfigürasyonu özellikleri sergiledikleri sonucuna varılmıştır. Üretilen BA2MAPb2I7/MoS2 heteroyapılarda, perovskit katmanının PL yoğunluğu, yük transferinden kaynaklanan sönümleme etkisi nedeniyle belirgin şekilde azalmaktadır. Özellikle heteroyapı bölgesinde MoS2 yapısının emisyon spektrumunda PL tepe noktasının 678 nm dalgaboyu değerinden 682 nm'ye kırmızı kayma yapması emisyon spektrumunda negatif trionların baskınlığını göstermekte ve heteroyapı içinde yük transferinin kanıtını sağlamaktadır. Buna ek olarak, perovskit tabakanın kalınlık değerine bağlı olarak fotofiziksel süreçlerin değişimi incelenmiştir. Sonuç olarak, kalınlık değerinin 10 nm altına düşmesiyle, PL sönümleme etkisinin önemli derecede arttığı, perovskit tabakanın PL spektrumunun yaklaşık olarak tamamının sönümlendiği gözlemlenmiştir. Bunun nedeni ise foton geri dönüşüm etkisinden dolayı kalınlık değeri arttıkça yük transfer sürecinin zayıflaması olarak belirtilmiştir. Diğer taraftan, bazı heteroyapılarda ise PL şiddetinin 8 kata kadar önemli derecede arttığı da gözlemlenmiştir ve arkasında yatan sebebin enerji transferi olabileceği öngörülmüştür. Buna ek olarak, üretilen BA2PbBr4/MoS2 ve BA2PbI4/MoS2 heteroyapılarda ise IX emisyon spektrumunun varlığı incelenmiş ve 532-1950 nm dalgaboyu değerleri arasında gözlemlenememiştir. Ayrıca, BA2MAPb2I7/MoS2 heteroyapısında olduğu gibi BA2PbBr4/MoS2 ve BA2PbI4/MoS2 heteroyapılarında da perovskit tabakanın kalınlık değerinin azalması ile MoS2 emisyon spektrumunda PL sönümleme etkisinin 12 kata kadar arttığı gözlemlenmiştir

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