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Formation of a stable reaction zone in electron-beam plasmochemical reactors: Experimental study and computer-aided modeling

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THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2016年第1期50卷 97-105页

作者： Vasilieva, T. M. Lysenko, S. L. State Univ Moscow Inst Phys & Technol Inst Per 9 Dolgoprudnyi 141700 Moscow Oblast Russia

The experimental study and computer-aided modeling of processes in the heterophase reaction zone of electron-beam plasmochemical reactors with a condensed disperse phase in the form of different organic and inorganic powders were performed. The obtained results were used as a basis to develop some methods for the formation of stable reaction zones, in which the long-term maintenance of specified beamplasma treatment regimes could be provided.

关键词： electron-beam plasma electron-beam plasmochemical reactors beam-plasma treatment plasmochemical reactions low-temperature plasma computer-aided modeling

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MeshCNN-based BREP to CSG conversion algorithm for 3D CAD models and its application

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Nuclear Science and Techniques 2022年第6期33卷 75-88页

作者： Yue-Tong Luo Hua Du Yi-Man Yan Hefei University of Technology Hefei 230009China University of Science and Technology of China Hefei 230027China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China State Power Investment Corporation Research Institute National Energy Key Laboratory of Nuclear Power SoftwareBeijing 102209China

In the field of neutronics analysis, it is imperative to develop computer-aided modeling technology for Monte Carlo codes to address the increasing complexity of reactor core components by converting 3D CAD model(boundary representation, BREP) to MC model(constructive solid geometry, CSG). Separation-based conversion from BREP to CSG is widely used in computer-aided modeling MC codes because of its high efficiency, reliability, and easy implementation. However, the current separation-based BREP-CSG conversion is poor for processing complex CAD models, and it is necessary to divide a complex model into several simple models before applying the separation-based conversion algorithm, which is time-consuming and tedious. To avoid manual segmentation, this study proposed a MeshCNN-based 3D-shape segmentation algorithm to automatically separate a complex model. The proposed 3D-shape segmentation algorithm was combined with separation-based BREP-CSG conversion algorithms to directly convert complex *** proposed algorithm was integrated into the computeraided modeling software cosVMPT and validated using the Chinese fusion engineering testing reactor model. The results demonstrate that the MeshCNN-based BREP-CSG conversion algorithm has a better performance and higher efficiency, particularly in terms of CPU time, and the conversion result is more intuitive and consistent with the intention of the modeler.

关键词： BREP to CSG conversion computer-aided modeling cosVMPT Intelligent pre-segmentation MeshCNN

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modeling and an Experimental Study of the Frequency Dependences of the Impedance of Composite Wires

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PHYSICS OF METALS AND METALLOGRAPHY 2022年第9期123卷 887-892页

作者： Bukreev, D. A. Derevyanko, M. S. Moiseev, A. A. Kudryavtsev, V. O. Kurlyandskaya, G., V Semirov, A., V Irkutsk State Univ Irkutsk 664003 Russia Ural Fed Univ Ekaterinburg 620002 Russia Univ Basque Country UPV EHU Dept Elect & Elect Leioa 48940 Spain

Some results are presented for the computer-aided modeling of the frequency dependences of the impedance of a composite highly conductive weakly magnetic strand thin magnetic coating wire. modeling was performed within a range of alternating current frequencies from 0.01 to 100 MHz in a broad interval of strand and coating specific electroconductivities and coating magnetic permeabilities. Two characteristic frequencies associated with the existence of two areas with different electrical and magnetic parameters, i.e., the strand and the coating were revealed. A convenient method of determining these frequencies is proposed. modeling results were compared with the experimental frequency dependences of the impedance of a CuBe/FeCoNi composite wire.

关键词： effective magnetic anisotropy magnetic impedance composite wires electrodeposited wires finite element method computer-aided modeling

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A comprehensive review of depressed collectors of slow-wave devices

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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 2021年第1期35卷 95-137页

作者： Latha, A. Mercy Ghosh, S. K. CSIR Cent Elect Engn Res Inst CSIR CEERI Chennai Ctr Microwave Devices Area Chennai Tamil Nadu India CSIR Cent Elect Engn Res Inst Microwave Devices Area Pilani Rajasthan India

Collectors are an indispensable part of any vacuum microwave devices where the electron beam - so-called spent electron beam emerged from interaction structure - is collected. Although the first publication on depressed collectors dates back to 1940s, several evolving researches are still being carried out on collectors till date. The incessant publications from researchers all over the globe reveal the fact that this field has much more potential and vigor to be explored. The outcome of such intensive and diversified research has been in achieving several novel design variants in the geometry, different computer-aided modeling and design optimization techniques, innovative methods to counter/suppress secondary electrons. This comprehensive review has been intended to cover all the major research findings consolidating them at one place so that it could be beneficial to any new reader in this field, thereby further research progress may be accelerated.

关键词： Collectors slow-wave devices novel designs computer-aided modeling design optimization secondary emission suppression

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modeling the Temperature Field in a High-Pressure Apparatus during the Sintering of Large-Sized Products Based on Boron Carbide

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JOURNAL OF SUPERHARD MATERIALS 2020年第4期42卷 240-250页

作者： Dutka, V. A. Maystrenko, A. L. Borymskyi, O. I. Kulich, V. G. Kosenchuk, T. O. Natl Acad Sci Ukraine Bakul Inst Superhard Mat UA-04074 Kiev Ukraine

A computer model is developed on the basis of the finite-element method for the temperature field formed during the sintering of large-size boron carbide products in the working cell of a high-pressure apparatus at a pressure of 0.5-1.0 GPa and temperatures of 1700-1750 degrees C. The dependence of the thermophysical properties of a sample on the porosity and temperature in the process of sintering is taken into account. It is shown that the selection of geometric parameters for the constructional elements of the working cell of a high-pressure apparatus makes it possible to find such a cell structure, whose application may provide a nearly uniform temperature field in a large-size sample under sintering and uniformity of the density and physicomechanical properties of the sintered sample.

关键词： boron carbide sintering high pressure temperature field computer-aided modeling

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Geometrically accurate structural analysis models in BIM-centered software

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AUTOMATION IN CONSTRUCTION 2019年 104卷 299-321页

作者： Hasan, Ahmed M. M. Torky, Ahmed A. Rashed, Youssef F. Nile Univ Sch Engn & Appl Sci CIEM Program Giza Egypt British Univ Egypt Civil Engn Dept Fac Engn El Sherouk City Egypt Cairo Univ Fac Engn CUFEBE Boundary Elements Res Grp Giza Egypt

Current BIM models impose restrictions on the geometry of building members in their analytical models, where components are fitted to wireframe representations. This unnecessary reduction in geometrical representation drives the loss of structural details and may lead to defective structural analysis. The present paper addresses the current shortcomings in the semantics of analytical models within BIM environments and recommends enhancements. An explanation is given of a BIM-centered structural analysis system based on coupling finite elements for vertical and horizontal elements, and boundary elements for slabs and foundations. The hybrid analysis system requires a more geometrically accurate BIM structural model, one which could eliminate the dimensional reduction of the physical structural model and can be used as an accurate pre-processor. To demonstrate the need and provide an intermediate solution, an add-in software is developed and integrated within a BIM platform (Revit). The developed generic add-in modifies the current analytical model from the BIM-authoring tool, to overcome the highlighted restrictions and satisfy the hybrid BEM-FEM system. The add-in software is verified with practical problems to justify the need for enhancements to BIM analytical models.

关键词： Building information modeling Boundary element method Finite element method BIM-authoring software computer-aided modeling Automated structural analysis

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Weight Optimisation of Electric Vehicle through Hybrid Structural Batteries

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INTERNATIONAL JOURNAL OF AUTOMOTIVE AND MECHANICAL ENGINEERING 2020年第4期17卷 8310-8325页

作者： Akbar, Faraz NED Univ Engn & Technol Dept Automot & Marine Engn Karachi 75270 Pakistan

This paper contributes towards the research and development campaign on the weight reduction of electric vehicles through the technology of structural composite batteries. Batteries are the key component and an integral part of electric vehicles which constitutes a major proportion of the vehicle's weight. Most of the electric vehicle manufacturers use lithium-ion batteries which are in recent years have gone through a major development. The use of lithium-ion batteries within a carbon reinforced composite structure of the car has given rise to the concept of structural batteries where both the mechanical strength of the structure and the chemistry of the battery to be optimized. Various aspects of design in the formulation of the structural batteries are reviewed including material selection with respect to its electrical and mechanical requirements. In this research work, properties of carbon fiber are utilised which provide mechanical strength to the vehicle whilst be an efficient electrode for the lithium-ion structural batteries. The impacts of lithiation on the strength of the structure and charge time for the batteries are explored. Significant results of weight reduction have been achieved by formulating the structural battery for the roof of a passenger car having a 30 kW-hr battery. At 0.7 mm of active electrode thickness is designed within the roof structure, the roof can store 5.9 kW-hr of energy with the reduction of 56.5 kg in overall weight of the vehicle. The battery pack of 255 kg gets completely replaced by the structural composite battery because of its magnificent specific charge capacity at the active electrode with the thickness of 3.5 mm.

关键词： Structural battery Electric vehicle Weight reduction computer-aided modeling Charge capacity

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Digital technology in craniofacial surgery – Historical perspectives to current applications

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Dentistry Review 2022年第1期2卷 100039-100039页

作者： Thushara Kumari Arvind Ramanathan Department of Oral and Maxillofacial Surgery Manipal College of Dental Sciences Manipal Academy of Higher Education Mangalore India

Presurgical planning forms an important aspect of craniofacial surgery which involves repositioning and reconstruction of facial and skull bones. Digital technology is being increasingly used for planning surgical procedures. Virtual surgical planning, computer-aided design and computer-aided modeling greatly improve the speed, scope and accuracy of surgery thereby providing better patient outcomes and satisfaction. In cases of craniofacial anomalies, cutting and positioning guides can be fabricated. For orthognathic surgery, realistic predictions of outcomes can be provided, in addition to improved presurgical planning. In maxillofacial trauma, facial height, width and projection can be better restored. TMJ/Skull base resection and reconstruction can be performed as single-stage operation. Intraoperative and graft ischemic time is reduced during oncologic resection and reconstruction. Potential limitation is added cost but this is offset by benefits like significantly reduced operating time, better dental alignment and improved esthetic outcome. In this review we attempt to briefly describe the historical developments, detail the application and assess the impact of technology for surgical planning and outcome.

关键词： Virtual surgical planning computer-aided design computer-aided modeling Craniofacial surgery Surgical navigation Stereolithography

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Substantiation of Mining-and-Transportation System Type and Parameters for Mining of Ore Deposits in the Conditions of the on the Kola Peninsula

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JOURNAL OF MINING SCIENCE 2018年第4期54卷 591-598页

作者： Gromov, E. V. Bilin, A. L. Belogorodtsev, O. V. Nagovitsyn, G. O. Russian Acad Sci Kola Sci Ctr Min Inst Apatity 184209 Russia Murmansk Arctic State Univ Apatity 184209 Russia

The technical approach to selection and substantiation of transportation systems for hard-to-access mineral mining in the Arctic is based on complexing computer-aided modeling and technical-and-economic assessment methods. The features of the transportation system design for mountainous and upland-and-flat terrains are described. The obtained relations of transportation cost and volume make it possible to validate the choice of transportation. In terms of the Partomchorr deposit, it is shown that under conditions of upland-and-flat terrain and minor level difference, it is efficient to use motor vehicles in case of small transportation volume (to 2.4 Mt/yr) and cable-and-belt conveying in case of large volume of transportation. For the Chinglusuai deposit situated in the upland country with large level difference, efficiency of cableway haulage with feasibility of energy recovery is substantiated.

关键词： Hard-to-access deposit Arctic zone industrial conveyance and hoistng facilities hybrid mining open pit mine underground mine computer-aided modeling enviornmental constraint technical-and-economic assessment

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Microwave frequency small-signal equivalent circuit parameter extraction for AlInN/GaN MOSHEMT

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INTERNATIONAL JOURNAL OF RF AND MICROWAVE computer-aided ENGINEERING 2018年第2期28卷 1-1页

作者： Amarnath, G. Panda, D. K. Lenka, T. R. Natl Inst Technol Silchar Dept Elect & Commun Engn Silchar 788010 Assam India

This article presents an accurate and efficient extraction procedure for microwave frequency small-signal equivalent circuit parameters of AlInN/GaN metal-oxide-semiconductor high electron mobility transistor (MOSHEMT). The parameter extraction technique is based on the combination of conventional and optimization methods using the computer-aided modeling approach. The S-, Y-, and Z- parameters of the model are extracted from extensive dynamic AC simulation of the proposed device. From the extracted Y- and Z- parameters the pad capacitances, parasitic inductances and resistances are extracted by operating the device at low and high frequency pinch-off condition depending upon requirement. Then, the intrinsic elements are extracted quasi analytically by de-embedding the extrinsic parameters. S-parameter simulation of the developed small-signal equivalent circuit model is carried out and is compared with TCAD device simulation results to validate the model. The gradient based optimization approach is used to optimize the small-signal parameters to minimize the error between developed SSEC model and device simulation based s-parameters. The microwave characteristics of optimized SSEC model is carried out (f(T)=169 GHz and f(max)=182 GHz) and compared with experimental data available from literature to validate the model.

关键词： microwave frequency computer-aided modeling MOSHEMT s-parameter small-signal equivalent circuit

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