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Microstructures in a carburized steel after isothermal pearlitic treatment

Journal of Materials Science & Technology 2023年第29期160卷 66-75页

作者： J.Abraham Mathews h.Farahani J.Sietsma r.h.petrov M.G.Mecozzi M.J.Santofimia Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628 CDDelftThe Netherlands Tata Steel research&Development IJmuidenThe Netherlands Department of Electromechanical Systems and Metal EngineeringGhent UniversityTech Lane Ghent Science park-Campus A ZwijnaardeTechnologiepark 46Belgium

The influence of carbon concentration variations on pearlite formation(20 h at 600℃)in a case-carburized steel is *** resultant microstructure shows three distinct regions:carburized case,a transition region,and the original *** microstructural transition from the case to the core regions is observed to be relatively *** investigated region of the carburized case(0.9 wt.%C)con-tains two types of pearlite:ferrite+cementite and ferrite+M_(23)C_(6),where the pearlitic aggregate with M_(23)C_(6)shows faster formation *** kinetics of pearlite formation in the transition region(0.3 wt.%C)is very slow and is observed with only M_(23)C_(6)*** around 40%austenite decomposes into pearlite in the transition region,which,in comparison to the carburized case region of 0.9 wt.%C is a fraction that is lower by a factor of *** is absent in the investigated core region(0.16 wt.%C).The microstructure in this region is predominantly martensite and pro-eutectoid ferrite,with a fraction of ferrite well below the equilibrium *** formation in this region is limited by the redistribution of mainly Ni,Mn,and Cr,and their resulting solute drag effect on the austenite/ferrite interface.A ther-modynamic and kinetic argumentation of these observations is provided with the help of thermodynamic data,precipitation simulations,and a general mixed-mode Gibbs energy balance model.

关键词： Pearlite formation Carburized steel M 2_(3)C_(6)carbide Kinetics Solute drag

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A full-wave hTS flux pump using a feedback control system

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Superconductivity 2023年第4期8卷 26-33页

作者： James h.P.rice Ben P.P.Mallett Dominic A.Moseley Alexander petrov heng Zhang Steven Wray rodney A.Badcock Paihau-robinson research Institute Victoria University of WellingtonLower Hutt 5012New Zealand UK Atomic Energy Authority Culham Science CentreAbingdon OX143DBUnited Kingdom

Transformer‐rectifier flux pumps are DC superconducting power supplies capable of charging superconducting magnets to high currents and stored magnetic ***,we demonstrate a full‐wave superconducting flux pump assembled from high‐temperature superconducting(hTS)wire that utilizes superconducting switches controlled by applied magnetic field.A negative DC offset occurs in the superconducting secondary of the circuit during operation which is related to the output load current.A feedback control system is proposed and demonstrated to account for the negative DC *** the primary current proportional to the load current during operation allowed for the maximum output of the flux pump to be increased from 35 A to more than 275 *** results are reproduced using a coupled electrical‐and magnetic–circuit model formulated in the MATLAB Simulink®package.

关键词： high‐temperature superconductor Flux pump Power supply Circuit modelling high current

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Pancreatic enzymes and abdominal adipose tissue distribution in new-onset prediabetes/diabetes after acute pancreatitis

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World Journal of Gastroenterology 2021年第23期27卷 3357-3371页

作者： Juyeon Ko Loren Skudder-hill Jaelim Cho Sakina h Bharmal Maxim S petrov School of Medicine University of AucklandAuckland 1142New Zealand

BACKGrOUND New-onset prediabetes/diabetes after acute pancreatitis(NODAP)is the most common sequela of pancreatitis,and it differs from type 2 prediabetes/diabetes mellitus(T2DM).AIM To study the associations between circulating levels of pancreatic amylase,pancreatic lipase,chymotrypsin and fat phenotypes in NODAP,T2DM,and *** Individuals with NODAP(n=30),T2DM(n=30),and sex-matched healthy individuals(n=30)were *** fat phenotypes(intra-pancreatic fat,liver fat,skeletal muscle fat,visceral fat,and subcutaneous fat)were determined using the same magnetic resonance imaging protocol and scanner magnet strength for all ***-way analysis of covariance,linear regression analysis,and relative importance analysis were *** Intra-pancreatic fat deposition(IPFD)was higher in NODAP(9.4%±1.8%)and T2DM(9.8%±1.1%)compared with healthy controls(7.8%±1.9%)after adjusting for covariates(P=0.003).Similar findings were observed in regards to visceral fat volume(P=0.005),but not subcutaneous fat volume,liver fat,or skeletal muscle *** IPFD(β=-2.201,P=0.023)and visceral fat volume(β=-0.004,P=0.028)were significantly associated with circulating levels of pancreatic amylase in NODAP,but not in T2DM or healthy *** the five fat phenotypes,IPFD explained the highest amount of variance in pancreatic amylase concentration(r2=15.3%out of 41.2%).None of the phenotypes contributed meaningfully to the variance in pancreatic lipase or *** Both NODAP and T2DM are characterized by increased IPFD and visceral fat ***,only NODAP is characterized by significant inverse associations between the two fat phenotypes and pancreatic amylase.

关键词： Amylase Lipase Chymotrypsin Pancreatitis Diabetes Intra-pancreatic fat Visceral fat Liver fat

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Observations and light curve solutions of the W UMa binaries V796 Cep,V797 Cep,CSS J015341.9+381641 and NSVS 3853195

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research in Astronomy and Astrophysics 2017年第5期17卷 31-38页

作者： Diana petrova Kjurkchieva Velimir Angelov Popov Sunay Ibryamov Ibryamov Doroteya Lyubenova Vasileva Nikola Ivanov petrov Department of Physics Shumen University115 Universitetska Str.9712 ShumenBulgaria IrIDA Observatory Rozhen NAOBulgaria Institute of Astronomy and NAO Bulgarian Academy of Sciences72 Tsarigradsko Shose Blvd.1784 SofiaBulgaria

Photometric observations in Sloan g′and i′bands of four W UMa binaries, V796 Cep,V797 Cep, CSS J015341.9＋381641 and NSVS 3853195, are presented. Our observations showed that CSS J015404.1＋382805 and NSVS 3853195 are the same star. We determined the initial epochs T_0 of all targets and found improved values for the period of NSVS 3853195. The light curve solutions of our data revealed that the components of each target are almost the same in terms of mass, temperature,radius and luminosity. The stellar components are G and K spectral types and undergo partial *** systems have barely-overcontact configurations and can be classified as h subtype W UMa *** established that the relation between the luminosity ratio l_2/l_1 and mass ratio q of our targets is approximately l_2/l_1 = q^（1.5）.

关键词： stars: binaries: eclipsing -- stars: fundamental parameters -- stars: individual (V796 Cep,V797 Cep CSS J015341.9+381641 NSVS 3853195)

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EBSD表征变形后退火Al7075/石墨烯纳米片/碳纳米管复合材料

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2250-2263页

作者： Siavash IMANIAN GhAZANLOU Baitallah EGhBALI roumen petrov Faculty of Materials Engineering Sahand University of TechnologyP.O.Box:51335-1996TabrizIran Department of Electromechanical Systems and Metal Engineering Research Group Materials Science and TechnologyGhent UniversityTech Lane Science Park Campus A469062 GentBelgium Department of Materials Science and Engineering Delft University of TechnologyMekelweg 2DelftThe Netherlands

研究变形后退火对碳纳米管(CNTs)和石墨烯纳米片(GNPs)增强热轧Al7075基复合材料显微组织演变的影响。对搅拌铸造样品进行多道次热轧,然后在450℃下退火4 h。采用SEM、EDS和EBSD技术观察材料的显微组织演变。EBSD数据显示,添加体积分数... 详细信息

研究变形后退火对碳纳米管(CNTs)和石墨烯纳米片(GNPs)增强热轧Al7075基复合材料显微组织演变的影响。对搅拌铸造样品进行多道次热轧,然后在450℃下退火4 h。采用SEM、EDS和EBSD技术观察材料的显微组织演变。EBSD数据显示,添加体积分数(下同)为0.87%的GNPs和CNTs可明显抑制再结晶的发生。当添加0.96%的CNTs时,再结晶受到部分抑制。而当添加0.92%的GNPs时,明显加快了粒子激发形核(PSN)机制导致的再结晶。在有增强相存在的情况下,再结晶晶粒的体积分数与PSN的产生有显著的关系。主要织构的强度和类型都取决于增强相的种类。

关键词：退火复合材料石墨烯纳米片碳纳米管再结晶粒子激发形核织构

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碱性长石中Fe^(3+)在四面体位置间交换动力学的EPr研究

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矿物学报 1989年第2期9卷 97-103页

作者：富毓德 Ivan petrov S.S.hafner 中国科学院地球化学研究所联邦德国马尔堡大学矿物学与结晶学研究所

在加热条件下,利用EPr方法研究了碱性长石中不同四面体位置间的Fe^(3+)、Al^(3+)交换。低温钠长石和透长石晶体分别在水热,1 kbar,500—900℃和干加热,1050℃条件下加热。在低温钠长石中,加热后Fe^(3+)线被加宽,当温度为800℃时,除T_1(o... 详细信息

在加热条件下,利用EPr方法研究了碱性长石中不同四面体位置间的Fe^(3+)、Al^(3+)交换。低温钠长石和透长石晶体分别在水热,1 kbar,500—900℃和干加热,1050℃条件下加热。在低温钠长石中,加热后Fe^(3+)线被加宽,当温度为800℃时,除T_1(o)位置外,没有出现其余四面体位置Fe^(3+)产生的谱线。透长石在1050℃加热1300h后,T_1和T_2线的相对强度发生了变化。实验表明,在碱性长石中不同四面体间Fe^(3+)、Ak^(3+)和Fe^(3+)、Si^(4+)交换与Al^(3+)、Si^(4+)交换比较,前者速度要缓慢得多。

关键词：长石碱性 Fe^3+ 动力学 EPr法

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Zeolite Synthesis under Insertion of Silica rich Filtration residues from Industrial Wastewater reconditioning

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Advances in Chemical Engineering and Science 2014年第2期4卷 120-134页

作者： Andrea hartmann V.petrov J.-C.Buhl K.rübner M.Lindemann C.Prinz A.Zimathies Institut für Mineralogie Universitat HannoverHannoverGermany Fachgruppe VII.1 Baustoffe Bundesanstalt für Materialforschung und-prüfung(BAM)BerlinGermany Fachbereich 1.3 Strukturanalytik richard-Willstätter Bundesanstalt für Materialforschung und-prüfung(BAM)BerlinGermany

Zeolite synthesis was studied using two silica rich filtration residues (Fr 1 and Fr 2) as Si-source and sodium aluminate in a direct synthesis at 60°C at strong alkaline conditions (8 M - 16 M NaOh). In addition to these one-pot syntheses, a two-step process was investigated. here, an alkaline digestion of Fr at 60°C was followed by gel precipitation with sodium aluminate and gel crystallization under usual conditions of 80°C - 90°C. The results show that the substitution of chemical reagent sodium silicate by a waste material like Fr as Si-source is possible but requires fine tuning of the reaction conditions as zeolite crystallization is a process under kinetic control. The solubility behaviour and impurities of the inserted filtration residues strongly influenced the course of reaction. Thus zeolites like hydrosodalite or intermediate zeolite between cancrinite and sodalite, or zeolite NaA or Z-21 in cocrystallization with hydrosodalite could be observed in the one pot syntheses already in a short time interval between 1 - 4 h depending on the alkalinity. The two step process yield to zeolites NaA and NaX in very good quality. The reaction process of Fr in both reaction methods was characterized by chemical analyses, X-ray powder diffraction, Fourier transform infrared spectroscopy as well as scanning electron microscopy. Surface area and water content of selected products were further characterized by the BET-method and by thermogravimetry. Summing up the results, we can show that zeolite formation from filtration residues is possible by several reaction procedures as model cases for a re-use of industrial waste materials. Beside the importance for environmental protection, the reactions are of interest for zeolite chemistry as the re-use of Fr is possible under economically conditions of low energy consumption at 60°C and short reaction periods.

关键词： Zeolites Superalkaline Conditions Filtration residues re-Use of Industrial Waste reaction Kinetics Silica residue

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Allelopathic Effects of Adonis vernalis L.: root Growth Inhibition and Cytogenetic Alterations

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Journal of Agricultural Chemistry and Environment 2015年第2期4卷 48-55页

作者： Asya Pencheva Dragoeva Vanya petrova Koleva Zheni Dimitrova Nanova Borislav petrov Georgiev Faculty of Natural Sciences University of Shumen Shumen Bulgaria

A possible alternative to synthetic agricultural chemicals is through the use of allelopathy. Adonis species are rich sources of secondary metabolites. Such allelochemicals offer potential for the development of future pesticides. Allelochemicals influence plant growth and cause morphological alterations. This visible effect could be due to primary effects at cellular or molecular level. Changes in the mitotic activity and disturbances in different phases of mitotic division are accepted as indicators of cytotoxic influence. Mitotic abnormalities and induction of micronuclei in interphase cells are parameters used to determine genotoxicity. The purpose of the current study was to establish the possible allelopathic effect of Adonis vernalis L. water extracts through evaluation of root growth inhibition effect and cytogenetic alterations. Adonis vernalis L. growing wild in Bulgaria was used in the present study. Two types of water extracts were prepared: hot and Cold Water Extract of A. vernalis (hWЕА and СWЕА). A 72-h root growth inhibition test was provided in order to determine the toxicity level of extracts. EC50 values were determined. For toxicity test, seeds of Triticum aestivum L. cv. GTW were used. Cytotoxic and genotoxic potential of water extracts (EC50) were evaluated using Allium cepa L.-test. The EC50 for hWEA and CWEA was determined 1.83 g/l and 0.78 g/l respectively. Significant influence on mitotic activity values and a marked decrease in percentage of telophase cells were observed after treatment with both extracts. Adonis extracts also induced different mitotic abnormalities in root-tip cells of Allium cepa L. The percent of interphase cells with micronuclei increased significantly only after treatment with hWEA. The results indicated growth inhibitory, cytotoxic and genotoxic effects of crude water extracts of A. vernalis L. These effects demonstrated the presence of water soluble allelochemicals in Adonis aerial parts.

关键词： Adonis vernalis L. Allelopathy root Growth Inhibition Allium cepa-Test

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Directional coherent light via intensity-induced sideband emission

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Light(Science & Applications) 2016年第1期5卷 33-38页

作者： Andrew J Traverso Chris O’Brien Brett h hokr Jonathan V Thompson Luqi Yuan Charles W Ballmann Anatoly A Svidzinsky Georgi I petrov Marlan O Scully Vladislav V Yakovlev Texas A&M University College StationTX 77843USA Princeton University PrincetonNJ 08544USA Baylor University WacoTX 76798USA

We introduce a unique technique for generating directional coherent emissions that could be utilized to create coherent sources in a wide range of frequencies from the extreme ultraviolet(XUV)to the deep *** is accomplished without population inversion by pumping a two-level system with a far-detuned strong optical field that induces the splitting of the two-level system.A nonlinear process of four-wave mixing then occurs across the split system,driving coherent emission at sidebands both redand blue-detuned from the pump frequency,and propagates both forward and backward along the pump beam *** observed this phenomenon in dense rubidium vapor along both the D_(1) and D_(2) *** sideband emission exhibits a short pulse duration(o1 ns)with threshold-like behavior dependent on both the pump intensity and rb vapor *** technique offers a new capability for manipulating the emission frequency simply through intensity-induced atomic modulation that can be scaled to most frequency regimes using various atomic/molecular ensembles and pump energies.

关键词： coherent emission collective coherence four-wave mixing

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r&D of back-end electronics for improved resistive plate chambers for the phase 2 upgrade of the CMS end-capmuon system

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radiation Detection Technology and Methods 2022年第3期6卷 306-316页

作者： h.Kou Z.-A.Liu J.Zhao J.Song Q.hou W.Diao P.Cao W.Gong N.Wang A.Samalan M.Tytgat M.El Sawy G.A.Alves F.Marujo E.A.Coelho F.Torres Da Silva De Araujo E.M.Da Costa h.Nogima A.Santoro S.Fonseca De Souza D.De Jesus Damiao M.Thiel M.Barroso Ferreira Filho K.Mota Amarilo A.Aleksandrov r.hadjiiska P.Iaydjiev M.rodozov M.Shopova G.Sultanov A.Dimitrov L.Litov B.Pavlov P.Petkov A.petrov E.Shumka S.J.Qian C.Avila D.Barbosa A.Cabrera A.Florez J.Fraga J.reyes Y.Assran M.A.Mahmoud Y.Mohammed I.Laktineh G.Grenier M.Gouzevitch L.Mirabito K.Shchablo C.Combaret W.Tromeur G.Galbit A.Luciol X.Chen I.Bagaturia I.Lomidze Z.Tsamalaidze V.Amoozegar B.Boghrati M.Ebraimi E.Zareian M.Mohammadi Najafabadi M.Abbrescia G.Iaselli G.Pugliese F.Loddo N.De Filippis r.Aly D.ramos W.Elmetenawee S.Leszki I.Margjeka D.Paesani L.Benussi S.Bianco D.Piccolo S.Meola S.Buontempo F.Carnevali L.Lista P.Paolucci F.Fienga A.Braghieri P.Salvini P.Montagna C.riccardi P.Vitulo E.Asilar J.Choi T.J.Kim S.Y.Choi B.hong K.S.Lee h.Y.Oh J.Goh I.Yu C.Uribe Estrada I.Pedraza h.Castilla-Valdez r.L.Fernandez A.Sanchez-hernandez E.Vazquez M.ramirez-Garcia N.Zaganidis A.radi h.hoorani S.Muhammad A.Ahmad I.Asghar M.A.Shah W.A.Khan J.Eysermans I.Crotty on behalf of the CMS Muon Group Department of Physics and Astronomy Ghent UniversityProeftuinstraat 869000 GhentBelgium UniversitéLibre de Bruxelles Avenue Franklin Roosevelt50-1050 BruxellesBelgium Centro Brasileiro Pesquisas Fisicas R.Dr.Xavier Sigaud150UrcaRio de JaneiroRio de Janeiro 22290-180Brazil Department de Fisica Nuclear e Altas Energias Instituto de FisicaUniversidade do Estado do Rio de JaneiroRua Sao Francisco Xavier524Rio de JaneiroRio de Janeiro 20559-900Brazil Bulgarian Academy of Sciences Institute for Nuclear Researches and Nuclear EnergyTzarigradsko Shaussee Boulevard 721784 SofiaBulgaria Faculty of Physics University of Sofia5 James Bourchier Boulevard1164 SofiaBulgaria School of Physics Peking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences B325Main BuildingNo.19(A)Yuquan RoadShijingshan DistrictBeijing 100049China Universidad de Los Andes Carrera 1No.18A-12BogotáColombia Egyptian Network for high Energy Physics Academy of Scientific Research and Technology101 Kasr El-Einy St.CairoEgypt Suez University SuezCairo RoadElsalam CitySuez 43522Egypt Center for high Energy Physics(ChEP-FU) Faculty of ScienceFayoum UniversityEl-Fayoum 63514Egypt Univ Lyon Univ Claude Bernard Lyon 1CNRS/IN2P3IP2I LyonUMR 582269622 VilleurbanneFrance Georgian Technical University 77 Kostava Str.0175 TbilisiGeorgia School of Particles and Accelerators Institute for Research in Fundamental Sciences(IPM)P.O.Box 19395-5531 TehranIran School of Engineering Damghan UniversityDamghan ***Iran INFN Sezione di BariVia Orabona 470126 BariItaly INFN Laboratori Nazionali di Frascati(LNF)Via Enrico Fermi 4000044 FrascatiItaly INFN Sezione di NapoliComplesso University Monte S.AngeloVia Cintia80126 NapoliItaly Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione UniversitàDegli Studi di Napoli Federico II80126 NapoliI

Purpose The Large hadron Collider(LhC)at European Organization for Nuclear research is planned to be upgraded to the high luminosity *** the luminosity makes muon triggering reliable and ofﬂine reconstruction very *** enhance the redundancy of the Compact Muon Solenoid(CMS)Muon system and resolve the ambiguity of track reconstruction in the forward region,an improved resistive Plate Chamber(irPC)with excellent time resolution will be installed in the Phase-2 CMS *** irPC will be equipped with Front-End Electronics(FEE),which can perform high-precision time measurements of signals from both ends of the *** Back-End Electronics(BEE)need to be researched and developed to provide sophisticated functionalities such as interacting with FEE with shared links for fast,slow control(SC)and data,in addition to trigger primitives(TPs)generation and data acquisition(DAQ).Method The BEE prototype uses a homemade hardware board compatible with the MTCA standard,the back-end board(BEB).BEE interacts with FEE via a bidirectional 4.8 Gbps optical paired-link that integrates clock,data,and control *** clock and fast/slow control commands are distributed from BEB to the FEE via the *** uplink is used for BEB to receive the time information of the irPC’sﬁred strips and the responses to the fast/slow control *** have a pipelined detector data for clusterﬁnding operation,recover(DeMux)the time relationship of which is changed due to the transmission protocol for the continuous incoming MUXed data from *** at each bunch crossing(BX),clusteringﬁred strips that satisfy time and spatial constraints to generate *** incoming raw MUXed detector data and TPs in a time window and latency based on the trigger signal are read out to the DAQ *** Ethernet(GbE)of SiTCP and commercial 10-GbE are used as link standards for SC and DAQ,respectively,for the BEB to interact with the *** The joint test results of

关键词： CMS irPC BEE TP DAQ SC

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