5916 research outputs found
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Search for flavor-changing neutral current interactions of the top quark and higgs boson in final states with two photons in proton-proton collisions at √s = 13 TeV
No full textProton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb(-1.) No significant excess above the background prediction is observed. Upper limits on the branching fractions (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for B(t -> Hu) and 0.073% (0.051%) for B(t -> Hc). These are the strictest upper limits yet determined.BMBWF and FWF (Austria) ; FNRS and FWO (Belgium) ; CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil) ; MES and BNSF (Bulgaria) ; CERN; CAS, MoST, and NSFC (China) ; MINCIENCIAS (Colombia) ; MSES and CSF (Croatia) ; RIF (Cyprus) ; SENESCYT (Ecuador) ; MoER, ERC PUT and ERDF (Estonia) ; Academy of Finland, MEC, and HIP (Finland) ; CEA and CNRS/IN2P3 (France) ; BMBF, DFG, and HGF (Germany) ; GSRI (Greece) ; NKFIA (Hungary) ; DAE and DST (India) ; IPM (Iran) ; SFI (Ireland) ; INFN (Italy) ; MSIP and NRF (Republic of Korea) ; MES (Latvia) ; LAS (Lithuania) ; MOE and UM (Malaysia) ; BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico) ; MOS (Montenegro) ; MBIE (New Zealand) ; PAEC (Pakistan) ; MSHE and NSC (Poland) ; FCT (Portugal) ; JINR (Dubna) ; MON, RosAtom, RAS, RFBR, and NRC KI (Russia) ; MESTD (Serbia) ; SEIDI, CPAN, PCTI, and FEDER (Spain) ; MOSTR (Sri Lanka) ; Swiss Funding Agencies (Switzerland) ; MST (Taipei) ; ThEPCenter, IPST, STAR, and NSTDA (Thailand) ; TUBITAK and TAEK (Turkey) ; NASU (Ukraine) ; STFC (United Kingdom) ; DOE and NSF (USA) .Publisher versio
Measurement and QCD analysis of double-differential inclusive jet cross sections in proton-proton collisions at s√ = 13 TeV
No full textA measurement of the inclusive jet production in proton-proton collisions at the LHC at s = 13 TeV is presented. The double-differential cross sections are measured as a function of the jet transverse momentum pT and the absolute jet rapidity |y|. The anti-kT clustering algorithm is used with distance parameter of 0.4 (0.7) in a phase space region with jet pT from 97 GeV up to 3.1 TeV and |y| < 2.0. Data collected with the CMS detector are used, corresponding to an integrated luminosity of 36.3 fb−1 (33.5 fb−1). The measurement is used in a comprehensive QCD analysis at next-to-next-to-leading order, which results in significant improvement in the accuracy of the parton distributions in the proton. Simultaneously, the value of the strong coupling constant at the Z boson mass is extracted as αS(mZ) = 0.1170±0.0019. For the first time, these data are used in a standard model effective field theory analysis at next-to-leading order, where parton distributions and the QCD parameters are extracted simultaneously with imposed constraints on the Wilson coefficient c1 of 4-quark contact interactions.BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); SEIDI, CPAN, PCTI, and FEDER (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (U.S.A.).
Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 724704, 752730, 758316, 765710, 824093, 884104, and COST Action CA16108 (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the F.R.S.-FNRS and FWO (Belgium) under the "Excellence of Science -EOS" -be.h project n. 30820817; the Beijing Municipal Science & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy -EXC 2121 "Quantum Universe" -390833306, and under project number 400140256 -GRK2497; the Lendulet ("Momentum") Programme and the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, the New National Excellence Program UNKP, the NKFIA research grants 123842, 123959, 124845, 124850, 125105, 128713, 128786, and 129058 (Hungary); the Council of Science and Industrial Research, India; the Latvian Council of Science; the Ministry of Science and Higher Education and the National Science Center, contracts Opus 2014/15/B/ST2/03998 and 2015/19/B/ST2/02861 (Poland); the Fundacao para a Ciencia e a Tecnologia, grant CEECIND/01334/2018 (Portugal); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, projects no. 14.W03.31.0026 and no. FSWW-2020-0008, and the Russian Foundation for Basic Research, project No.19-42-703014 (Russia); the Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias; the Stavros Niarchos Foundation (Greece); the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the Welch Foundation, contract C-1845; and the Weston Havens Foundation (U.S.A.).Publisher versio
Impact of solar hosting capacity on distribution transformer efficiency
No full textToday, with the increasing electricity demand, the tendency to use renewable resources such as solar photovoltaics is increasing. However, this type of renewable energy brings some challenges if the electricity demand is less than the produced solar power. Some of these challenges are reverse power flow, overloading of transformers, increase in power losses, and rise in voltage. There are existing hosting capacity methodologies to mitigate these challenges; however, there is no study on the impact of solar hosting capacity on transformer efficiency. In this study, three aspects of transformer losses are analyzed: various rated powers, different electricity demands, and solar hosting capacity
Take the red pill for H3 and see how deep the rabbit hole goes
No full textWith the introduction of HTTP/3 (H3) and QUIC at its core, there is an expectation of significant improvements in Web-based secure object delivery. As HTTP is a central protocol to the current adaptive streaming methods in all major streaming services, an important question is what H3 will bring to the table for such services. To answer this question, we present the new features of H3 and QUIC, and compare them to those of H/1.1/2 and TCP. We also share the latest research findings in this domain.Österreichische Nationalstiftung für Forschung, Technologie und Entwicklung ; Christian Doppler Forschungsgesellschaft ; Bundesministerium für Digitalisierung und WirtschaftsstandortPublisher versio
Search for heavy resonances decaying to Z (ν¯ν) V (q¯q′) in proton-proton collisions at √s = 13 TeV
No full textA search is presented for heavy bosons decaying to Z(νν¯)V(qq¯′), where V can be a W or a Z boson. A sample of proton-proton collision data at s=13 TeV was collected by the CMS experiment during 2016-2018. The data correspond to an integrated luminosity of 137 fb-1. The event categorization is based on the presence of high-momentum jets in the forward region to identify production through weak vector boson fusion. Additional categorization uses jet substructure techniques and the presence of large missing transverse momentum to identify W and Z bosons decaying to quarks and neutrinos, respectively. The dominant standard model backgrounds are estimated using data taken from control regions. The results are interpreted in terms of radion, W′ boson, and graviton models, under the assumption that these bosons are produced via gluon-gluon fusion, Drell-Yan, or weak vector boson fusion processes. No evidence is found for physics beyond the standard model. Upper limits are set at 95% confidence level on various types of hypothetical new bosons. Observed (expected) exclusion limits on the masses of these bosons range from 1.2 to 4.0 (1.1 to 3.7) TeV.BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); SEIDI, CPAN, PCTI, and FEDER (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the MarieCurie program and the European Research Council and Horizon 2020 Grant, Contracts No. 675440, No. 724704, No. 752730, No. 758316, No. 765710, No. 824093, No. 884104, and COST Action No. CA16108 (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation `a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium); the F. R. S.-FNRS and FWO (Belgium) under the "Excellence of Science-EOS"-be.h Project No. 30820817; the Beijing Municipal Science & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy-EXC 2121 "Quantum Universe"-390833306, and under Project No. 400140256-GRK2497; the Lendulet ("Momentum") Program and the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, the New National Excellence Program UNKP, the NKFIA research Grants No. 123842, No. 123959, No. 124845, No. 124850, No. 125105, No. 128713, No. 128786, and No. 129058 (Hungary); the Council of Science and Industrial Research, India; the Latvian Council of Science; the Ministry of Science and Higher Education and the National Science Center, Contracts No. Opus 2014/15/B/ST2/03998 and No. 2015/19/B/ST2/02861 (Poland); the Fundacao para a Ciencia e a Tecnologia, Grant No. CEECIND/01334/2018 (Portugal); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, Project No. 14.W03.31.0026 (Russia); the Programa Estatal de Fomento de la Investigacion Cientifica y T ' ecnica de Excelencia Maria de Maeztu, Grant No.
MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias; the Stavros Niarchos Foundation (Greece); the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the Welch Foundation, Contract No. C-1845; and the Weston Havens Foundation (USA).Publisher versio
Perceptual processes of children regarding their nearby home environments living in two socially diverse subcommunities
No full textHuman life that is collective and diverse on the one hand, but complex and chaotic on the other, is largely experienced in
metropolitan cities owing to a significant amount of migration. Istanbul can be defined as a city that constantly witnesses massive influxes of migration and ultimately becomes socially heterogeneous. It was hypothesized in this study that the multilayered urban character of the city affects the perceptions of city-dwellers, especially children. As such, the study focused on the perceptual differences of children living in socially diverse urban settings, and a comparative analysis was conducted to reveal the children’s environmental perceptions regarding their nearby home environments. This case-study-oriented research was conducted with 11-year-old children from two subcommunities both located in the periphery of Istanbul: one from a gecekondu settlement on the fringes of Istanbul, and the other, a planned residential settlement (PRS). The methodology was based on the representations by the children since this methodology has the potential to present an
understanding of spatial perception through both quantitative and qualitative dimensions. A representation of children’s houses with their immediate surroundings was requested from the children so that two different cognitive map datasets were obtained regarding two diverse subcommunities. Significant results were obtained in the study, in which gender and settlement type were used as independent variables. As a result, it was revealed that the girls were more inclined to draw their own rooms, were more focused on indoor spaces and were further apt to draw the domestic appliances. When the results were evaluated depending on the settlement type variable, it was revealed that those living in PRS represented indoors more and were specifically focused on their own rooms, while those living in gecekondu settlement tended to draw domestic appliances and outdoor spaces more
Relating dynamic test capacity, digital tracking of countries and COVID-19 Performance: A cross-country study
No full textN/
Sürekli tavlama fırınının ışınımla ısınımı üzerine sayısal araştırma
No full textAnnealing as a type of heat treatment process is widely used in the glass manufacturing industry. It is the last stage of the manufacturing process and has a highly dominant effect on the quality of the glass. Especially in large volume glass manufacturing the annealing process is carried out in a continuous type annealing furnace. In that furnace, the different stages of the annealing process are accomplished in the different zones of the same furnace. The main purpose of the heating zone of the furnace is to increase the temperature of the glass back to the annealing temperature. Due to the temperature levels reaching 923 K inside the furnace, radiation heat transfer has a dominant effect in this zone of the furnace. Due to the mostly nonparticipating nature of the furnace atmosphere, the radiation heat transfer is governed by the view factors between the glass and the furnace walls. At the wavelength range of the radiation emitted from the furnace walls, the glass can be modelled as opaque. Since the view factor between the glass and the furnace walls depend on the distance between the glass rows inside the furnace, the layout of the glassware could have a considerable effect on the heating effectiveness of the furnace. In this numerical study, a combined conduction–radiation solver was developed to investigate the heating characteristics of moving bottles inside the radiant heating section of a continuous annealing furnace. The solver was designed as a hybrid solver running the conduction and the radiation calculations on the CPU and the GPU (graphic processing unit) respectively. The radiation transfer between the opaque surfaces has been calculated with the Backward Monte Carlo Ray Tracing method. Running the method on the GPU, the computational cost of the radiation model has been massively reduced. Overall, 91% of the total computational time is spent by the radiation calculations and only 9% was taken by the heat conduction calculations. Moreover, two numerical methods regarding the integration of the radiation model with the heat conduction solver were developed. It was found that for the same level of accuracy the 2nd order accurate method enables to increase the time step in the transient calculations by a factor of 2.5 times concerning the 1st order accurate implementation. The considered furnace model consists of 29 bottle rows along the length of the furnace and with 15 bottles in each row. The initial temperature of the bottles was taken considering the moulding stage of the manufacturing line. The computational cost of the problem was reduced by considering the 7 rows of bottles in the computational domain. The developed algorithm enables simulation of the heat transfer across all the bottle rows using only a fraction of the entire row inside the furnace. Finally, a parametric study on the effect of the spacings between the bottle rows has been conducted. In this regard, the spacing between the bottles rows and the conveyor speed have been altered in a way that the throughput of the furnace, the number of bottles processes per unit time, is kept constant. The study shows that there is an optimum value for the spacing between the bottle rows. For the considered bottle form, this optimum row spacing value is found to be 35% of the bottle diameter.Tavlama bir tür ısıl işlem methodu olarak cam imalatı endüstrisinde yaygın olarak kullanılmaktadır. Üretim sürecinin son aşamasında tatbik edilir ve cam kalitesinde hâkim bir etki sahibidir. Yüklü sayıda cam üretimi gerçekleştilen ısıl işlem dizisi, özellikle sürekli tip tavlama fırınında gerçekleşir. Fırın içerisinde tavlama işleminin farklı aşamaları yine aynı fırının farklı bölümlerinde gerçekleşir. Fırının ısıtma bölgesindeki temel amaç; camın ısıtılarak tavlama sıcaklığına geri getirilmesidir. Fırın içerisindeki sıcaklığın 923 K mertebelerine ulaşması sebebiyle ışınım ile ısı transferi hayli önem arz etmektedir. Işınım ile ısı transferi iştirak halinde olmayan fırın ortamı sebebiyle çoğunlukla cam ile fırın duvarları arasındaki görüş katsayısına bağlı olarak hüküm sürer. Fırın duvarlarından yayılan ışınımın dalga boyu aralığında cam opak olarak kabul edilebilir. Cam nesnelerin fırın içerisindeki yerleşim planı, cam ve fırın duvarları arasındaki görüş katsayısı birbirine olan mesafeye bağlı olması sebebiyle fırının ısıtma etkililiği üzerinde hatırı sayılır ölçüde etkisi olabilir. Bahsi geçen sayısal çalışmada iletim ve ışınımı konu alan bir dizi işlem yürütücüsü geliştirilmiş ve bunun vasıtasıyla sürekli tip tavlama fırınının ışınımla ısınma bölümünde sürekli hareket halinde bulunan şişelerin ısınma niteliği ortaya koyulmuştur. Dizi işlem yürütücüsünde bilgisayarın merkezi işlemci birimi ve grafik işleme biriminden faydalanması nedeniyle karma bir nitelik söz konusudur. Opak yüzeyler arasındaki ışınımla ısı transferi "Backward Monte Carlo Ray Tracing" adı verilen metot ile hesaplandı. Bu metot, grafik işleme birimini ile yazılımsam entegrasyonda bulunarak bilgisayımsal değerini büyük ölçüde azaltmıştır. Toplam bilgisayımsal sürenin %91 (yüzde doksan bir) kadarı ışınım ile ısı transferi işlemleri ve yalnızca %9 (yüzde dokuz) kadarı iletim ile ısı transfer işlemleri için harcanmıştır. Dahası ışınım modeline ilişkin olarak iki sayısal methot geliştirildi. Her iki metot için de aynı hassaslık değerinin yakalandığı aralıkta ikinci dereceden doğruluk sahibi metot, birinci dereceden doğruluk sahibi metoda nispeten birim zaman aralığını 2,5 (2 tam, onda beş) kat artırmaya imkan vermiştir. Gerçeklenmiş fırın modeli, her bir sırada 15 şişe olmak üzere toplamda 29 şişe sırasına elverişlidir. Şişelerin ilk, başlangıç sıcaklığı üretim hattının bir diğer bölümü olan kalıpma işlemi dikkate alınarak atanmıştır. Problemin bilgisayımsal değeri gerçeklenmiş fırın modeli içerisinde yalnızca 7 şişe sırası dikkate alınarak azaltılmıştır. Geliştirilen dizi işlem yürütücü, algoritma, fırın içerisinde bulunan 29 şişe sırasındaki her bir bardağın ısı transfer mekanizmasını sadece 7 şişe sırası dikkate alınması suretiyle bilgisayar tabanlı benzetimi mümkün kılmıştır. Şişe sıraları arasındaki mesafenin etkisi üzerine değişken eksenli ölçülendirme çalışması nihayet yürütüldü. Bu bağlamda şişeler arasındaki mesafeler ve taşıyıcı kayış hızı birim zamanda çıkan iş oranını sabit kılacak şekilde birbirine uyarlandı. Çalışma bulguları şişe sıraları arası mesafenin uygun bir değeri olduğunu ortaya koyuyor. Çalışmada kullanılan şişe şekline mukabil sıra aralığının uygun değeri, şişe çapının yüzde 35'i olarak bulundu
Effect of boronizing and WC coating on the high temperature mechanical behavior of AISI 321 stainless steel
No full textIn the current paper, the effect of two different coating techniques of boronizing and tungsten carbide (WC) coating on the room and high temperature tensile behavior of the AISI 321 stainless steel were investigated. Consequently, the fracture morphology observations were conducted via scanning electron microscopy (SEM) to inspect the variation of fracture mechanisms after implementing different coating methods. The results of tensile tests at room temperature revealed that despite boronizing reduced the yield strength of the sample due to the softening and grain growth at high coating temperature, the dispersion of boron particles improved the work hardening and ductility of boronized AISI 321. In contrast, the strain to failure of the WC coated sample was decreased due to the fast fracture of the ceramic WC layer at both room and high tensile tests. Furthermore, results of SEM revealed that particle decomposition occured on the fracture surface of the boronized 321 stainless steel represented by dispersed boron particles on the edges of the dimples after failure at high temperature
WordNet and wikipedia connection in Turkish WordNet KeNet
No full textThis paper aims to present WordNet and Wikipedia connection by linking synsets from Turkish WordNet KeNet with Wikipedia and thus, provide a better machine-readable dictionary to create an NLP model with rich data. For this purpose, manual mapping between two resources is realized and 11,478 synsets are linked to Wikipedia. In addition to this, automatic linking approaches are utilized to analyze possible connection suggestions. Baseline Approach and ElasticSearch Based Approach help identify the potential human annotation errors and analyze the effectiveness of these approaches in linking. Adopting both manual and automatic mapping provides us with an encompassing resource of WordNet and Wikipedia connections