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Measurement of Inclusive and Differential Cross Sections of Single Top Quark Production in Association with a W Boson in Proton-Proton Collisions at s = 13.6 TeV
No full textThe first measurement of the inclusive and normalised differential cross sections of single top quark production in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13.6 TeV is presented. The data were recorded with the CMS detector at the LHC in 2022, and correspond to an integrated luminosity of 34.7 fb−1. The analysed events contain one muon and one electron in the final state. For the inclusive measurement, multivariate discriminants exploiting the kinematic properties of the events are used to separate the signal from the dominant top quark-antiquark production background. A cross section of 82.3±2.1stat−9.7+9.9syst±3.3lumi pb is obtained, consistent with the predictions of the standard model. A fiducial region is defined according to the detector acceptance to perform the differential measurements. The resulting differential distributions are unfolded to particle level and show good agreement with the predictions at next-to-leading order in perturbative quantum chromodynamics. © 2025 Elsevier B.V., All rights reserved
Search for Fractionally Charged Particles in Proton-Proton Collisions at √s=13 TeV
No full textStylianou, Nicolas/0000-0002-0113-6829; Hall, Geoffrey/0000-0002-6299-8385; Lasaosa Garcia, Clara/0000-0003-2726-7111; Krintiras, Georgios Konstantinos/0000-0002-0380-7577; Garcia, Francisco/0000-0002-4023-7964; Costa, Salvatore/0000-0001-9919-0569; Azzurri, Paolo/0000-0002-1717-5654; Paulini, Manfred/0000-0002-6714-5787; Colaleo, Anna/0000-0002-0711-6319; Portales, Louis/0000-0002-9860-9185; Ruiz, Jose/0000-0002-3306-0363; Rinkevicius, Aurelijus/0000-0002-7510-255X; Josa Mutuberria, Isabel/0000-0002-4985-6964; Yagil, Avi/0000-0002-6108-4004; Dozen, Candan/0000-0002-4301-634X; D'Enterria, David/0000-0002-5754-4303; Brigljevic, Vuko/0000-0001-5847-0062; Kole, Gouranga/0000-0002-3285-1497; Hamel De Monchenault, Gautier/0000-0002-3872-3592; D'Anzi, Brunella/0000-0002-9361-3142; Redondo, Ignacio/0000-0003-3737-4121; Brooke, James/0000-0003-2529-0684; Moureaux, Louis/0000-0002-2310-9266; Heath, Helen/0000-0001-6576-9740; Lucchini, Marco Toliman/0000-0002-7497-7450; Vami, Tamas Almos/0000-0002-0959-9211; Dasu, Sridhara/0000-0001-5993-9045; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Tao, Junquan/0000-0003-2006-3490; Clement, Emyr/0000-0003-3412-4004; Lai, Yihui/0000-0002-7795-8693; Bruschini, Davide/0000-0001-7248-2967; Gerosa, Raffaele/0000-0001-8359-3734; Saka, Halil/0000-0001-7616-2573; Usai, Emanuele/0000-0001-9323-2107; Raidal, Martti/0000-0001-7040-9491; Wallny, Rainer/0000-0001-8038-1613; Beaudette, Florian/0000-0002-1194-8556; Malgeri, Luca/0000-0002-0113-7389; Benitez, J.F./0000-0002-2633-6712; Grab, Christophorus/0000-0002-6182-3380; Tonelli, Guido Emilio/0000-0003-2606-9156; Feld, Lutz/0000-0001-9813-8646; Papageorgakis, Christos/0000-0003-4548-0346; Ferencek, Dinko/0000-0001-9116-1202; Geurts, Frank/0000-0003-2856-9090; Jung, Hannes/0000-0002-2964-9845; Rizzi, Andrea/0000-0002-4543-2718; Mitra, Soureek/0000-0002-3060-2278; Hussain, Priya Sajid/0000-0002-4825-5278; Attia Mahmoud, Mohammed/0000-0001-8692-5458; Sculac, Ana/0000-0001-7938-7559; Stein, Annika/0000-0003-0713-811X; Tarricone, Cristiano/0000-0001-6233-0513; Kim, Bobae/0000-0002-9539-6815; Marzocchi, Badder/0000-0001-6687-6214; Robert, Schoefbeck/0000-0002-2332-8784; Al Kadhim, Ali/0000-0003-3490-8407; Chatterjee, Suman/0000-0003-2660-0349; Diotalevi, Tommaso/0000-0003-0780-8785; De Guio, Federico/0000-0001-5927-8865; Puerta Pelayo, Jesus/0000-0001-7390-1457; Schroder, Matthias/0000-0001-8058-9828; Manzoni, Riccardo Andrea/0000-0002-7584-5038; Mitselmakher, Guenakh/0000-0001-5745-3658; Lassila-Perini, Kati/0000-0002-5502-1795; Lu, Meng/0000-0002-6999-3931; Heredia De La Cruz, Ivan/0000-0002-8133-6467; Delaere, Christophe/0000-0001-8707-6021; Landsberg, Greg/0000-0002-4184-9380; Mrenna, Stephen/0000-0001-8731-160X; Holmes, Tova/0000-0002-3959-5174; Cardini, Andrea/0000-0003-1803-0999; Fernandez Bedoya, Cristina/0000-0001-8057-9152; Levchuk, Leonid/0000-0001-5889-7410; Csanad, Mate/0000-0002-3154-6925; Chokheli, Davit/0000-0001-7535-4186; Gonzalez Caballero, Isidro/0000-0002-8087-3199; Saygin, Kadir/0000-0002-8419-1400; Goy Lopez, Silvia/0000-0001-6508-5090; Lo Meo, Sergio/0000-0003-3249-9208; Belyaev, Andrey/0000-0003-1692-1173; Belyaev, Alexander/0000-0002-1733-4408; Ventura, Sandro/0000-0002-8938-2193; Tumasyan, Armen/0009-0000-0684-6742; Martelli, Arabella/0000-0003-3530-2255; Titov, Maxim/0000-0002-1119-6614; Hahn, Kristian/0000-0001-7892-1676; Haller, Johannes/0000-0001-9347-7657; Calderon Tazon, Alicia/0000-0002-7205-2040; Grunewald, Martin/0000-0002-5754-0388; Walsh, Roberval/0000-0002-3872-4114; Missiroli, Marino/0000-0002-1780-1344; Bernardes, Cesar Augusto/0000-0001-5790-9563; Reichert, Joseph/0000-0003-2110-8021; Sarkar, Uttiya/0000-0002-9892-4601; Tapper, Alexander/0000-0003-4543-864X; Gonzalez Lopez, Oscar/0000-0002-4532-6464; Moraes, Arthur/0000-0002-5157-5686; Hernandez Calama, Jose Maria/0000-0001-6436-7547; Wang, Dayong/0000-0002-9013-1199; Rappoccio, Salvatore/0000-0002-5449-2560; Caminada, Lea/0000-0001-5677-6033; Bethani, Agni/0000-0002-8150-7043; Leonardo, Nuno/0000-0002-9746-4594; Trevisani, Nicolo/0000-0002-5223-9342; Cussans, David/0000-0001-8192-0826; Wilson, Jonathan/0000-0002-5672-7394; Litov, Leandar/0000-0002-8511-6883; Bortignon, Pierluigi/0000-0002-5360-1454; Li, Qiang/0000-0002-8290-0517; Ngadiuba, Jennifer/0000-0002-0055-2935; Legger, Federica/0000-0003-1400-0709; Bloom, Kenneth/0000-0002-4272-8900; Kreczko, Luke/0000-0003-2341-8330; Canelli, Florencia/0000-0001-6361-2117; Moon, Chang-Seong/0000-0001-8229-7829; Benato, Lisa/0000-0001-5135-7489; Perez Adan, Danyer/0000-0003-3416-0726; Alcaraz Maestre, Juan/0000-0003-0914-7474; Pesaresi, Mark/0000-0002-9759-1083; Mendizabal, Mikel/0000-0002-6506-5177; Blekman, Freya/0000-0002-7366-7098; /0000-0002-1153-816X; Chahal, Gurpreet Singh/0000-0003-0320-4407; Azzi, Patrizia/0000-0002-3129-828X; Dubinin, Mikhail/0000-0002-7766-7175; Mundim, Luiz/0000-0001-9964-7805; De La Cruz Burelo, Eduard/0000-0002-7469-6974; Evdokimov, Olga/0000-0002-1250-8931; Martinez Ruiz Del Arbol, Pablo/0000-0002-7737-5121; Gutsche, Oliver/0000-0002-8015-9622; Rabbertz, Klaus/0000-0001-7040-9846; Kogler, Roman/0000-0002-5336-4399; Escalante Del Valle, Alberto/0000-0002-9702-6359; Dragicevic, Marko/0000-0003-1967-6783; Gomez-Ceballos, Guillelmo/0000-0003-1683-9460; Hinzmann, Andreas/0000-0002-2633-4696; Sahasransu, Abanti Ranadhir/0000-0003-1505-1743; Vannerom, David/0000-0002-2747-5095; Sharma, Varun/0000-0003-1287-1471; /0000-0002-6047-4211; Mora Herrera, Maria Clemencia/0000-0003-3915-3170; Tornago, Marta/0000-0001-6768-1056; Sanchez-Hernandez, Alberto/0000-0001-9548-0358; Naimuddin, Md/0000-0003-4542-386X; Tytgat, Michael/0000-0002-3990-2074; Pieri, Marco/0000-0003-3303-6301; Novaes, Sergio/0000-0003-0471-8549; Murillo Quijada, Javier Alberto/0000-0003-4933-2092; Konecki, Marcin/0000-0001-9482-4841; Janssen, Tahys/0000-0002-3998-4081; Abbiendi, Giovanni/0000-0003-4499-7562; You, Zhengyun/0000-0001-8324-3291; Collard, Caroline/0000-0002-5230-8387; Goldstein, Joel/0000-0003-1591-6014; Dewanjee, Dr. Ram Krishna/0000-0001-6645-6244; Benaglia, Andrea Davide/0000-0003-1124-8450; Fernandez Perez Tomei, Thiago Rafael/0000-0002-1809-5226; Noll, Dennis Daniel Nick/0000-0002-0176-2360; Bhowmik, Sandeep/0000-0003-1260-973X; Kim, Tae Jeong/0000-0001-8336-2434; Wittich, Peter/0000-0002-7401-2181; Gershtein, Yuri/0000-0002-4871-5449; Smith, Nicholas/0000-0002-0324-3054; Navarro-Tobar, Alvaro/0000-0003-3606-1780; Sznajder, Andre/0000-0001-6998-1108; Waltenberger, Wolfgang/0000-0002-6215-7228; Kolberg, Ted/0000-0002-0211-6109; Demiroglu, Zuhal Seyma/0000-0001-7977-7127; Hajahmad (Wael Haj Ahmad), Vael/0000-0003-1491-0446; Jabeen, Shabnam/0000-0002-0155-7383; Diaz, Daniel/0000-0001-6834-1176; Lipton, Ronald/0000-0002-6665-7289; Melo Da Costa, Eliza/0000-0002-5016-6434; Vischia, Pietro/0000-0002-7088-8557; Delgado Peris, Antonio/0000-0002-8511-7958; Rebello Teles, Patricia/0000-0001-9029-8506; Trocino, Daniele/0000-0002-2830-5872; Cepeda, Maria/0000-0002-6076-4083; Steggemann, Jan/0000-0003-4420-5510; Yang, Tianyu Justin/0000-0003-4317-4660; Tishelman-Charny, Abraham/0000-0002-7332-5098; Pasztor, Gabriella/0000-0003-0707-9762; Botta, Cristina/0000-0002-8072-795X; Lethuillier, Morgan/0000-0001-6185-2045; Verdini, Piero Giorgio/0000-0002-0042-9507; Duarte, Javier Mauricio/0000-0002-5076-7096; Verdier, Patrice/0000-0003-3090-2948; Spagnolo, Paolo/0000-0001-7962-5203; Ulrich, Ralf/0000-0002-2535-402X; Pradhan, Raghunath/0000-0001-7000-6510; Giacomelli, Paolo/0000-0002-6368-7220; Matorras, Francisco/0000-0003-4295-5668; Ivanov, Andrew/0000-0002-9270-5643; Dutta, Valentina/0000-0001-5958-829X; Padula, Sandra S./0000-0003-3071-0559; Ahmad, Ashfaq/0000-0002-4770-1897; Singh, Jasbir/0000-0001-9029-2462; De Moor, Alexandre/0000-0001-5964-1935; Smith, Wesley/0000-0003-3195-0909; Everaerts, Pieter/0000-0003-3848-324X; Jin, Weijie/0009-0009-8976-7702; Shi, Zhaozhong/0000-0001-5498-8825; Grandi, Claudio/0000-0001-5998-3070; Karneyeu, Anton/0000-0001-9983-1004; Kyberd, Paul/0000-0002-7353-7090; Malik, Sudhir/0000-0002-6356-2655; Petrucciani, Giovanni/0000-0003-0889-4726; Fernandez Menendez, Javier/0000-0002-5213-3708; Meola, Sabino/0000-0002-8233-7277; Kunnawalkam Elayavalli, Raghav/0000-0002-9202-1516; Reis, Thomas/0000-0003-3703-6624; Yazgan, Efe/0000-0001-5732-7950; Taylor, Lucas/0000-0002-6584-2538; Vilela Pereira, Antonio/0000-0003-3177-4626; Tinoco Mendes, Andre David/0000-0001-5854-7699; Jafari, Abideh/0000-0001-7327-1870; Kondratyev, Dmitry/0000-0002-7874-2480; Dolek, Furkan/0000-0001-7092-5517; Golf, Frank/0000-0003-3567-9351; Tiras, Emrah/0000-0002-5628-7464; Wilson, Graham/0000-0003-0917-4763; Giammanco, Andrea/0000-0001-9640-8294; Schwandt, Joern/0000-0002-0052-597X; Forthomme, Laurent/0000-0002-3302-336X; Wardle, Nicholas/0000-0003-1344-3356; Pastrone, Nadia/0000-0001-7291-1979; Galli Mercadante, Pedro/0000-0001-8333-4302; Sharma, Ashish/0000-0002-0688-923X; Fouz Iglesias, Maria Cruz/0000-0003-2950-976X; Alverson, George/0000-0001-6651-1178; Ecklund, Karl/0000-0002-6976-4637; Kasemann, Matthias/0000-0002-0429-2448; Alves, Gilvan/0000-0002-8369-1446; Androsov, Konstantin/0000-0003-2694-6542; Ligabue, Franco/0000-0002-1549-7107A search is presented for fractionally charged particles with charges below 1e, using their small energy loss in the tracking detector as a key variable to observe a signal. The analyzed dataset corresponds to an integrated luminosity of 138 fb(-1) of proton-proton collisions collected at root s = 13 TeV in 2016-2018 at the CERN LHC. This is the first search at the LHC for new particles with a charge between e/3 and 0.9e, including an extension of previous results at a charge of 2e/3. Masses up to 640 GeV and charges as low as e/3 are excluded at 95% confidence level. These are the most stringent limits to date for the considered Drell-Yan-like production mode.We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid and other centers for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies: SC (Armenia), 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); ERC PRG, RVTT3 and TK202 (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); SRNSF (Georgia); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIH (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); MES and NSC (Poland); FCT (Portugal); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); MHESI and NSTDA (Thailand); TUBITAK and TENMAK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).FWF; FNRS; FWO (Belgium); CNPq; CAPES; FAPERJ; FAPERGS; FAPESP (Brazil); BNSF (Bulgaria); MoST; NSFC (China); CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); ERC PRG [TK202]; Academy of Finland; MEC; CEA; CNRS/IN2P3 (France); SRNSF; BMBF; HGF (Germany); NKFIH (Hungary); DAE; DST; SFI (Ireland); INFN (Italy); NRF (Republic of Korea); MES (Latvia); MOE; UM (Malaysia); BUAP; CONACYT; UASLP-FAI (Mexico); PAEC (Pakistan); FCT (Portugal); MESTD (Serbia); PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); NSTDA; TUBITAK; NASU (Ukraine); DOE; NS
Induced Stresses & Displacements Caused by Sinkhole Development
No full textInduced stress-strain conditions around underground spaces which could be excavated or naturally formed have their destructive influences on the surrounding rock masses. Roof and sidewall rocks surrounding these spaces are strained due to 3D induced stress fields formed just after their introductions. Cavities/excavated underground spaces have their stability difficulties due to surrounding rock masses’ strength/discontinuity features. Stable rocks around these spaces including stable pillars are candidates which supply deformations in time due to their long-term strength characteristics. Collapsing of the rock masses surrounding the underground spaces causes caving effects through the rock masses above the spaces. If the collapsed rock masses cannot support the above overburden dead-loads as fragmented rock fills in the caved spaces, progressive failures are continued upward directions to form further subsidence deformations. Underground water circulations at the caved spaces provide different circumstances including the transportations and/or solution of the caved rocks in time. These processes eventually provide progressive subsidence/sinkhole in time due to elimination of submerged caved/fragmented rocks. The procedures causing progressive roof failures were analysed here for hypothetical rock mass conditions to understand the procedures’ governing factors. Evaluating these factors supply hints about what could be the engineering manners to decrease the risk of sinkhole developments
Characterization of Fly Ash Reinforced Wood Polypropylene Composites
No full textIn this study, fly ash, which is released as waste from thermal power plants and has negative effects on the environment, was evaluated as a filler in wood-plastic composite materials (WPC). For this purpose, inorganic fly ash from thermal power plants was mixed with polypropylene (PP) thermoplastic polymer at 10%, 20%, 30%, 40%, and 50% by extrusion method instead of wood flour used in wood plastic composite materials. Maleic anhydride-treated polypropylene (MAPP) was used to strengthen the bonding during WPC production. The material mixed in extrusion was passed through a crusher and turned into pellets. Test samples were prepared using injection molding of pelletized WPC material. Density, thickness swelling, water absorption, modulus of rupture, impact strength, modulus of elasticity in bending, tensile strength, janka hardness, differential scanning calorimetry (DSC), and thermogravimetric analyses (TGA) were performed on the prepared test samples. The results indicated that as the amount of fly ash used in the wood-plastic composite material increases, the density increases but the thermal degradation temperature of the material, water uptake, the swelling ratio to its thickness, tensile strength, impact strength, janka hardness, modulus of rupture, and modulus of elasticity decrease. © The Author(s) 2024.Istanbul Üniversitesi; Düzce Üniversitesi, (2020.07.01.1079); Düzce Üniversites
Investigation of the Effect of Workpiece Surface Treatments and Coating Type on Formability in Cold Forging Process
No full textFriction is of great importance in metal forming operations as it directly affects the material flow during deformation, the stress and strain distribution on the workpiece, the forming load and as a result, the tool and die life. In the study, the effects of surface treatments, coatings and lubricants applied before cold forging of axle tulips used in automotive axles on formability together with friction were investigated. In this context, the effects of lubricants and coatings used in cold forging processes on the process and the effects of the sandblasting process performed before were investigated. With the increase in friction in the cold forging operation of the axle tulip, the surface quality of the workpiece deteriorates, and hairline cracks are observed. This poses a risk in terms of product safety. In the study, the effects of surface treatments, coatings and lubricants affecting the friction between the mold and workpiece surfaces on the friction coefficient were investigated experimentally and the most suitable surface treatment, coating and lubrication conditions for this process were investigated. The Columbian friction coefficients of coatings and lubricants were measured, and wear depths and widths were compared. SEM and EDS analyses of the coated samples were performed to examine the distribution of the elements forming the coating on the surface and their mass ratios. Simufact Forming software was used to create simulations with 6 different shear friction coefficients and 8 different extrusion ratios and to create calibration curves. In DCET tests, forward and reverse extrusion ratios were calculated and the positions of the coating and lubricants within the calibration curve were determined. According to the results obtained from the experimental studies, the tests were tested on the automotive axle tulip this time. In the first stage, simulations of the axle tulip were performed at different shear friction coefficients using finite element software. In the second stage, the cold forging process of the product was performed and compared with the simulation results. According to the results obtained, it was determined that the friction coefficient, which was around 0.6 in coatings made without soap coating, decreased to 0.18 because of coatings made with soap. The friction coefficient decreased to 0.12 with new generation coatings. While the shear friction value 'm' was obtained between 0.02 and 0.025 from the simulation results, the 'm' value was obtained as 0.022 in the DCET test, thus the simulation results were confirmed with the experimental results. In addition, it was seen that the shear friction value obtained from the experimental results and the results obtained from the cold forging of the axle tulip agreed with each other.Sürtünme, deformasyon esnasındaki malzeme akışını, iş parçası üzerindeki gerilme ve gerinim dağılımını, şekillendirme yükünü ve bunların neticesinde takım ve kalıp ömrünü doğrudan etkilediği için metal şekil verme operasyonlarında büyük önem arz etmektedir. Çalışmada otomotiv akslarında kullanılan aks lalelerinin soğuk dövme öncesi yapılan yüzey işlemleri, kaplamalar ve yağlayıcıların sürtünmeyle birlikte şekillendirilebilirliğe etkileri araştırılmıştır. Bu kapsamda soğuk dövme işlemlerinde kullanılan yağlayıcıların ve kaplamaların prosese olan etkileri ile öncesinde yapılan kumlama işleminin etkileri incelenmiştir. Aks lalesinin soğuk dövme operasyonunda sürtünmenin artması ile iş parçası yüzey kalitesi bozulmakta ve kılcal çatlaklar görülmektedir. Bu da ürün emniyeti açısından risk teşkil etmektedir. Çalışmada kalıp ve iş parçası yüzeyleri arasındaki sürtünmeyi etkileyen yüzey işlemleri, kaplamalar ve yağlayıcıların sürtünme katsayına etkileri deneysel olarak incelenmiş ve bu süreç için en uygun yüzey işlemi, kaplama, yağlama koşulları araştırılmıştır. Kaplamaların ve yağlayıcıların Kolomb sürtünme katsayıları ölçülmüş, aşınma derinlikleri ve genişlikleri kıyaslanmıştır. Kaplama yapılan numunelerin SEM ve EDS analizleri yapılarak kaplamayı oluşturan elementlerin yüzeydeki dağılımları ve kütle oranları incelenmiştir. Simufact Forming yazılımı kullanılarak 6 farklı kayma sürtünme katsayısı ve 8 farklı ekstrüzyon oranı ile simülasyonlar yapılıp kalibrasyon eğrileri oluşturulmuştur. DCET testlerinde ileri ve geri ekstrüzyon oranları hesaplanarak kaplama ve yağlayıcıların kalibrasyon eğrisi içerisindeki konumları belirlenmiştir. Deneysel çalışmalardan elde edilen sonuçlara göre testler bu kez otomotiv aks lalesi üzerinde denenmiştir. İlk etapta sonlu elemanlar yazılımı kullanılarak farklı kayma sürtünme katsayısında aks lalesine ait simülasyonlar gerçekleştirilmiştir. İkinci aşamada ise ürünün soğuk dövme işlemi gerçekleştirilerek simülasyon sonuçları ile karşılaştırılmıştır. Elde edilen sonuçlara göre sabun kaplama olmadan yapılan kaplamalarda 0,6 civarında olan sürtünme katsayısının, sabun ile yapılan kaplamalar neticesinde 0,18 değerine kadar düştüğü belirlenmiştir. Yeni nesil kaplamalar ile sürtünme katsayısı 0,12 değerine kadar azalmıştır. Simülasyon sonuçlarından 'm' kayma sürtünme değeri 0.02 ile 0.025 arasında elde edilirken DCET testinde 'm' değeri 0.022 elde edilmiş, böylece simülasyon sonuçları, deney sonuçları ile doğrulanmıştır. Ayrıca deneysel sonuçlardan çıkan sürtünme katsayısı değeri ile aks lalesinin soğuk dövülmesinden elde edilen sonuçların birbiriyle uyum içinde olduğu görülmüştür
Rapid Removal of Congo Red From Aqueous Solutions Using Ba2mg(bo3 Investigations Into Kinetics, Thermodynamics and Isotherms
No full textThe current study investigates the removal of the toxic Congo red (CR) dye from wastewater using Ba2Mg(BO3)(2). The novel adsorbent with the formula Ba2Mg(BO3)(2) was prepared using a solution combustion process. Several characterisation techniques were used, including FT-IR, SEM-EDX, and XRD. The powder XRD technique was used to analyse the phase of the prepared adsorbent. Five factors were analysed in the experiments: contact time, pH, initial concentration, adsorbent dose, and temperature. The findings indicated that these factors had an impact on the adsorption capacity. The Langmuir, Freundlich, Dubinin;Radushkevich, and Temkin;Pyzhev isotherms models were used to assess the results from experiments on adsorption isotherms. According to the experimental findings, the Langmuir model fits with a maximal adsorption capacity of 1666.667 mg/g for CR. Physical adsorption and electrostatic interaction are thought to be the removal mechanisms based on fitting to pseudo-second-order kinetics model. The adsorption of Ba2Mg(BO3)(2) for CR is physisorption. CR was found to have favourable specific adsorption enthalpy and entropy on Ba2Mg(BO3)(2). With its high adsorption capacity and rapid synthesizability, Ba2Mg(BO3)(2) can be recommended for use in CR removal
Investigation of Piezoelectric and Photoluminescence Properties of the Multifunctional La2sn2o7 and Ho2sn2o7 Pyrochlore Smart Materials Doped With Eu3+
No full textRE2-xEuxSn2O7 (RE:La3+ and Ho3+, x:0.10) materials were synthesized having both pholuminescence and piezoelectric properties using with solid state reaction method at various reaction temperature and heating duration in open atmosphere. The thermal behaviors, crystal system, surface morphology, EDX analysis, Curie tempereture, photoluminescent properties, dielectric and piezoelectric properties of Eu3+ ions doped La2Sn2O7 and Ho2Sn2O7 were investigated. Both multi-functional smart materials show dielectric, piezoelectric properties and photoluminescence properties which is responsible transitions of doping Eu3+ ions.TUBITAK (The Scientific and Technological Research Council of Turkey) [114Z438]The authors express their gratitude to TUBITAK (The Scientific and Technological Research Council of Turkey) for supporting the project numbered 114Z438. This study was conducted at Karamanoglu Meh-metbey University
Enhanced Hydrogen Generation in Borohydride Hydrolysis Using an Efficient and Reusable Ia-Cnt Supported Co-Mo Catalyst
No full textThis study explored the synthesis and catalytic performance of an itaconic acid (IA)-modified, carbon nanotubesupported Co-Mo-B catalyst (IA-CNT@Co-Mo-B) for hydrogen generation via NaBH4 and KBH4 hydrolysis. The catalyst was tailored to improve efficiency and address renewable energy challenges. The catalyst's performance was evaluated by varying the catalyst amounts, temperatures, and concentrations of NaOH, KOH, NaBH4, and KBH4. Comprehensive characterization techniques were employed, including FTIR, XRD, FE-SEM/EDX, TEM, XPS, and BET. FE-SEM imaging revealed regions with highly ordered and aligned structures within the IA-CNT matrix, likely due to the effective doping of Co, Mo, and B. BET analysis revealed a significant surface area of 71.56 m(2) g(-1) and a pore diameter of 16.57 nm, categorizing the IA-CNT@Co-Mo-B catalyst as mesoporous, which enhanced its catalytic activity. This catalyst achieved high hydrogen generation rates (HGR) of 5.3 L g(metal)(-1) min(-1) with NaBH4 and 7.2 L g(metal)(-1) min(-1) with KBH4 at 30 degrees C. Activation energies were determined to be 24.58 kJ mol(-1) for NaBH4 and 20.38 kJ mol(-1) for KBH4, with respective reaction orders of 0.3 and 0.8. The reusability tests demonstrated stability over ten cycles, emphasizing its industrial potential for clean energy technologies
Recovery of Valuable Compounds From Apricot Concentrate Production Waste Using Supercritical Carbon Dioxide Extraction as a Green Separation Method
No full textApricot concentrate production wastewater (APW), which contains significant amounts of phenolic compounds and exhibits antioxidant activity, is also a major environmental pollutant. This study aimed to recover valuable compounds from APW and mitigate its environmental impact using the supercritical carbon dioxide (SC–CO2) extraction method. Pressure and temperature variables were studied within the ranges of 8.5–31.5 MPa and 38.5–61.5 °C, respectively. A five–level central composite design (CCD) was applied to statistically analyze the interaction between experimental conditions and results. As a result of the extraction, up to 25% yield and 3.3% total phenolic content (TPC) recovery were achieved, along with a functional extract containing over 2000 mg GAE/L phenolic substances, antioxidant activity exceeding 3000 µM TE, and a significant amount of polyunsaturated fatty acids. Using response surface methodology, the optimum conditions for SC–CO2 extraction were determined to be 60 °C and 10 MPa. Toxicity values across three trophic levels, along with selected pollution parameters, were assessed before and after the extraction. Notably, following the extraction process, the toxic classification of the wastewater, as determined by the Daphnia magna toxicity test, improved from the very toxic category (Class IV) to the toxic category (Class III). © The Author(s) 2025.Mehmet Emin Argun; Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (120Y351); Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK; KTUN-BAP, (222301003
Upper Cretaceous Foreland Flysch Deposits From the Neotethyan Intra-Pontide Ocean: Geological and Palaeontological Evidence From the Elmadağ Olistostrome of Ankara, Central Türkiye
No full textThe Ankara region of Türkiye is located on the Sakarya Continent, bounded by two NeoTethyan oceans (Intra-Pontide to the north and Izmir-Ankara-Erzincan to the south). In this region, the oldest lithologies of the Sakarya Continent are the Middle Triassic Dikmen Greywacke. The lower part of the Dikmen Greywacke comprises low-grade metamorphics, while its upper part is primarily represented by non-metamorphic greywacke with rare carbonates/chert interlayers and a basic volcanic breccia at the top. The Dikmen Greywacke is overlain unconformably by the Coniacian Elmadağ Olistostrome, composed of blocks of varying sizes (pebble to mega-block of 2-3km width) within a calcareous clastic to clayey carbonate matrix. Based on the benthonic Foraminifera assemblages, while detrital limestone provides a Kungurian to Changhsingian (late Early to latest Permian) age, platform carbonates yield latest Capitanian-late Changhsingian (latest Middle to latest Permian) ages. Radiolarian assemblages reveal a Changhsingian (latest Permian) age from a radiolarian chert, middle Late Ladinian (Middle Triassic) from a spiculite/radiolarian chert, latest Bajocian-early Bathonian (Middle Jurassic) from a radiolarian chert, early Hauterivian (Early Cretaceous) from a pelagic limestone, and late Hauterivian (Early Cretaceous) from a radiolarian chert. Combined geological and palaeontological evidence suggest that the Elmadağ Olistostrome has been formed in a foreland basin in front of the southwardly advancing nappes originating from the Intra-Pontide domain. The determined ages imply that the Intra-Pontide basin was rifted after the Artinskian (Early Permian), possibly during late Early Permian to latest Permian. With the gradual deepening of this basin, the first pelagic rock unit occurred in late Changhsingian (latest Permian), where platform carbonates were also present at the rim of the basin in this time interval. Due to the continuous deepening in the basin, pelagic rock units were deposited from middle Late Ladinian (Middle Triassic) to late Hauterivian (Early Cretaceous). By correlation to the other olistostrome occurrence to the south of the Ankara region, it can be suggested that the Elmadağ Olistostrome formed in the Ankara region during Coniacian (Late Cretaceous) owing to the closure of the Intra-Pontide Ocean. © 2025 Author(s).Slovenska Akademija Znanosti in Umetnosti, SASA; Hacettepe Üniversitesi, (FHD-202220129); Hacettepe Üniversites