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超级高铁

城市环境设计 2019年第2期118卷 260-267页

作者： Erik Berg Kreider Adi Krainer Ashton Stare Cheyenne Vandevoorde Cristian Lera Daniele Pronesti Derek Wong Domenic Schmid Evan Wiskup Francesca Portesine Hugo Soo Kristian Hindsberg Lam Le Nguyen Lasse Kristensen Linda Halim Maureen Rahman ovidiu munteanu Pei Pei Yang Ryan Duval Stephen Steckel Terrence Chew Thomas Christoffersen Tore Banke Veronica Moretti Yehezkiel Wiliardy 曲鸿

BIG的创始合伙人比亚克评价说:"通过超级高铁,我们定义了一个由客舱和站门组成的交通出行生态系统。人们不必等车,也不再需要候车厅,超级高铁用接近超音速的速度将集体社会和个人自由联系在一起。在未来,这种崭新的出行方式将改变我们... 详细信息

BIG的创始合伙人比亚克评价说:"通过超级高铁,我们定义了一个由客舱和站门组成的交通出行生态系统。人们不必等车,也不再需要候车厅,超级高铁用接近超音速的速度将集体社会和个人自由联系在一起。在未来,这种崭新的出行方式将改变我们对时空的习惯认知,我们脑海中对城市版图的理解也将随之改变。"

关键词：传送器目的地 portal

O(t^(-β))-SYNCHRONIZATION AND ASYMPTOTIC SYNCHRONIZATION OF DELAYED FRACTIONAL ORDER NEURAL NETWORKS

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Acta Mathematica Scientia 2022年第4期42卷 1273-1292页

作者： Anbalagan PRATAP Ramachandran RAJA 曹进德黄创霞 Jehad ALZABUT ovidiu BAGDASAR Department of Mathematics Alagappa UniversityKaraikudi 630004India Ramanujan Centre for Higher Mathematics Alagappa UniversityKaraikudi 630004India School of Mathematics Southeast UniversityNanjing 211189China Yonsei Frontier Lab Yonsei UniversitySeoul03722South Korea Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science and TechnologyChangsha410114China Department of Mathematics and General Sciences Prince Sultan UniversityRiyadh 12435Saudi Arabia Department of Electronics Computing and MathematicsUniversity of DerbyUnited Kingdom

This article explores the O(t^(-β))synchronization and asymptotic synchronization for fractional order BAM neural networks(FBAMNNs)with discrete delays,distributed delays and non-identical *** designing a state feedback control law and a new kind of fractional order Lyapunov functional,a new set of algebraic sufficient conditions are derived to guarantee the O(t^(-β))Synchronization and asymptotic synchronization of the considered FBAMNNs model;this can easily be evaluated without using a MATLAB LMI control ***,two numerical examples,along with the simulation results,illustrate the correctness and viability of the exhibited synchronization results.

关键词： O(t^(-β))-synchronization asymptotic synchronization BAM neural networks fractional order state feedback control law

High-flux electron beams from laser wakefield accelerators driven by petawatt lasers

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Plasma Science and Technology 2017年第7期19卷 7-11页

作者：曾明 ovidiu TESILEANU Extreme Light Infrastructure-Nuclear Physics Horia Hulubei National Institute for Physics and Nuclear Engineering

Laser wakefield accelerators （LWFAs） are considered to be one of the most compeuuve next- generation accelerator candidates. In this paper, we will study the potential high-flux electron beam production of an LWFA driven by petawatt-level laser pulses. In our three-dimensional particle-in-cell simulations, an optimal set of parameters gives -40 nC of charge with 2 PW laser power, thus -400 kA of instantaneous current if we assume the electron beam duration is 100 fs. This high flux and its secondary radiation are widely applicable in nuclear and QED physics, industrial imaging, medical and biological studies.

关键词： laser accelerator petawatt laser high-flux electron beam

Charged Scalars in Transient Stellar Electromagnetic Fields

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Chinese Physics Letters 2011年第1期28卷 20-23页

作者： Marina-Aura Dariescu Ciprian Dariescu ovidiu Buhucianu Faculty of Physics A1. I. Cuza' University Bd. Carol I No. 11 700506 Iaoi Romania

We consider a non-rotating strongly magnetized object, whose magnetic induction is of the form Bx= Bo （t） sin kz. In the electromagnetic field generated by only one component of the four-vector potential, we solve the Klein- Gordon equation and discuss the sudden growth of the scalar wave functions for wavenumbers inside computable ranges. In the case of unexcited transversal kinetic degrees, we write down the recurrent differential system for the amplitude functions and compute the respective conserved eurrents.

关键词： Astrophysics and astroparticles

NORM CALCULATIONS OF A CLASS OF INTEGRAL OPERATORS

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Analysis in Theory and Applications 2010年第3期26卷 215-221页

作者： ovidiu Furdui The University of Toledo

In this paper we calculate the norm of a special class of integral operators acting on LP （C^n, dvs）, where dvs is the Gaussian measure on C^n.

关键词： integral operator Bergman type projection Fock space Gaussian measure

Carbon nanotubes decorated α-Al_2O_3 containing cobalt nanoparticles for Fischer-Tropsch reaction

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Journal of Energy Chemistry 2013年第2期22卷 279-289页

作者： Yuefeng Liu Thierry Dintzer ovidiu Ersen Cuong Pham-Huu Laboratoire des Matriaux Surfaces et Procds pour la Catalyse (LMSPC) UMR 7515 CNRS-Universit de Strasbourg (UdS) 25 rue Becquerel 67087 Strasbourg Cedex 08 France Institut de Physique et Chimie des Matriaux de Strasbourg (IPCMS) UMR 7504 CNRS-Universit de Strasbourg (UdS) 23 rue du Loess 67037 Strasbourg Cedex 02 France

A new hierarchical composite consisted of multi-walled carbon nanotubes （CNTs） layer anchored on macroscopic a-A1203 host matrix was synthesized and used as support for Fischer-Tropsch synthesis （FTS）. The composite constituted by a thin shell of a homogeneous, highly entan-gled and structure-opened carbon nanotubes network and it exhibited a relatively high and fully accessible specific surface area of 76 m2.g-1, compared with that of 5 m2.g-1 of the original a-A1203support. The metal-support interaction between carbon nanotubes surface and cobalt precursor and high effective surface area led to a relatively high dispersion of cobalt nanoparticles. This hierarchically supported cobalt catalyst exhibited a high FTS activity along with an extremely high selectivity towards liquid hydrocarbons compared with the cobalt-based catalyst supported on pristine a-A1203 or on CNTs carriers. This improvement can attribute to the high accessibility of composite surface area com- paring with the macroscopic host structure alone or to the bulk CNTs where the nanoscopic dimension induced a dense packing with low mass transfer which favoured the problem of reactants competitive diffusion towards the cobalt active site. In addition, intrinsic thermal conductivity of decorated CNTs could help the heat dissipating throughout the catalyst body, thus avoiding the formation of local hot spots which appeared in high CO conversion under pure syngas feed in FTS reaction. Cobalt supported on CNTs decorated a-A1203 catalyst also exhibited satisfied high stability during more than 200 h on stream under relatively severe conditions compared with other catalysts reported in the literature. Finally, the macroscopic shape of such composite easily rendered its usage as catalyst support in a fixed-bed configuration without facing problems of transport and pressure drop as encountered with the bulk CNTs.

关键词： carbon nanotubes Fischer-Tropsch synthesis a-A1203 hierarchical support cobalt nanoparticles

Surgical Video Review of Warm Ischemia Time during Laparoscopic Partial Nephrectomy and Impact on Positive Surgical Margins and Postoperative Complications

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Open Journal of Urology 2023年第1期13卷 9-17页

作者： ovidiu Spiru Barnoiu Alf Ole Tysland Aage Waldemar Andersen Department of Urology Sorlandet Hospital Kristiansand Norway Department of Urology Sorlandet Hospital Arendal Norway

Introduction: A surgical video review is an emerging tool for quality improvement, especially in complex surgeries such as laparoscopic partial nephrectomy (LPN). Assessing and measuring the warm ischemia time (WIT) during LPN by dividing it into the time used for resection (ResT), time used for reconstruction (RecT) and intermediate time (IntT) has not been performed before. This study aimed to analyze the factors that can influence all these surgical times and assess their impact on positive surgical margins (PSM) and complication rates. Methods: We evaluated 36 surgical video recordings from patients who underwent LPN and measured WIT, ResT, RecT and IntT with a stopwatch. Factors such as tumor characteristics and surgeon experience were also recorded. SPSS software was used to identify the predictor factors for all these surgical times and to correlate the ResT with PSM and RecT with the complication rate. Results: We recorded a mean WIT of 887 seconds. The mean ResT, RecT and IntT were 240 (27.2% of WIT), 473 (52.6% of WIT) and 173 s (20.2% of WIT), respectively. We found a moderate correlation between the WIT (p = 0.030), IntT and the R.E.N.A.L. score (p = 0.019). The surgeon with less than 100 LPN had significantly longer WIT, ResT, and RecT values, with means of 977 (p = 0.015), 268 (p = 0.019) and 530 seconds (p = 0.015), respectively. No correlation was found between ResT and PSM (p = 0.418);however, a strong correlation was found between RecT and the probability of developing complications (p = 0.012). Conclusion: The surgeon’s experience influences WIT, ResT, and RecT, but not IntT, which depends on tumor complexity. RecT affects the probability of developing complications. IntT represents a fifth of the WIT and efforts to reduce the WIT should focus on reducing the IntT for complex tumors, by improving surgical planning.

关键词： Surgical Video Laparoscopic Partial Nephrectomy Warm Ischemia Time

Promotion effects of alkali metals on iron molybdate catalysts for CO_(2)catalytic hydrogenation

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Journal of Energy Chemistry 2023年第10期85卷 291-300,I0009页

作者： Yong Zhou Aliou Sadia Traore Deizi V.Peron Alan J.Barrios Sergei A.Chernyak Massimo Corda Olga V.Safonova Achim Iulian Dugulan ovidiu Ersen Mirella Virginie Vitaly V.Ordomsky Andrei Y.Khodakov University of Lille CNRSCentrale LilleUniversity of ArtoisUMR 8181-UCCS-Unitéde Catalyse et Chimie du SolideLille F-59000France IPCMS UMR 7504 CNRSUniversitéde Strasbourg23 rue du LoessBP 43Cedex 267034 StrasbourgFrance PSI CH-5232 VilligenSwitzerland Fundamental Aspects of Materials and Energy Group Delft University of TechnologyMekelweg 15Delft 2629 JBNetherlands

CO_(2)hydrogenation is an attractive way to store and utilize carbon dioxide generated by industrial processes,as well as to produce valuable chemicals from renewable and abundant *** catalysts are commonly used for the hydrogenation of carbon oxides to ***-molybdenum catalysts have found numerous applications in catalysis,but have been never evaluated in the CO_(2)*** this work,the structural properties of iron-molybdenum catalysts without and with a promoting alkali metal(Li,Na,K,Rb,or Cs)were characterized using X-ray diffraction,hydrogen temperatureprogrammed reduction,CO_(2)temperature-programmed desorption,in-situ^(57)Fe Mossbauer spectroscopy and operando X-ray adsorption *** catalytic performance was evaluated in the CO_(2)*** the reaction conditions,the catalysts undergo the formation of an iron(Ⅱ)molybdate structure,accompanied by a partial reduction of molybdenum and carbidization of *** rate of CO_(2)conversion and product selectivity strongly depend on the promoting alkali metals,and electronegativity was identified as an important factor affecting the catalytic *** CO_(2)conversion rates were observed with the promoters having higher electronegativity,while low electronegativity of alkali metals favors higher light olefin selectivity.

关键词： CO_(2)utilization Iron molybdate catalysts Promotion Alkali metals Light olefins In-situ characterization

New Two-Frequency Method and Devices for Electromagnetic Levitation Drip- and Leakage-Free Melting of Metals

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Journal of Iron and Steel Research(International) 2012年第S2期19卷 687-690页

作者： PESTEANU ovidiu BAAKE Egbert Institute of Electrotechnology Leibniz Universitat Hannover

A new method and devices for the electromagnetic levitation melting of metallic samples with greater weights and axisymmetrically stabilized positions is presented in this *** new method is applying two homogeneous magnetic fields of different frequencies,whose field lines are in absence of a charge horizontally and reciprocally normal in order to exert electromagnetic lift forces also on the axis of the levitated *** the weight of the charge can be increased and the charge can be drip- and leakage-free *** method can be used in a melting furnace with or without a cold protective wall,as well as for the coreless induction valves applied for flow rate control,*** the continuous casting of molten *** applicability of the method was experimentally examined and proved by tests conducted with three types of laboratory setups.

关键词： electromagnetic levitation melting two-frequency method leakage-free melting cold protective wall