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A procedural footprint enhancement of global topographic surface with multiple levels of detail

International Journal of Digital Earth 2020年第4期13卷 527-545页

作者： Lukáš Brůha jan Kolář Faculty of Science Department of Applied Geoinformatics and CartographyCharles University in PraguePragueCzech Republic Grifinor Project CopenhagenDenmark

Virtual globes are technologies for visual navigation through a threedimensional,multi-resolution model of the entire *** representations used in virtual globes,however,lack geometric flexibility at high-resolution levels of the planet-wide terrain *** is a problem especially if boundaries between individual geospatial features and the terrain are important.A novel integration of individual polygonal boundaries with a specific multi-resolution representation of the planet-wide terrain is developed in this *** the preparation stage,the integration relies on an original simplification algorithm applied to the polygonal boundaries between geospatial features and the *** output is a multiple level-of-detail(LOD)geometry,which can be combined with a known multi-LOD representation of the terrain that uses run-time *** data representation is suitable for storage in existing database systems,avoids any data redundancy across LODs,and is even independent of the subdivision schema that partitions the planet’s surface for the sake of dealing with *** runtime,a novel reconstruction algorithm stitches geometric parts from different LODs together in a manner that augments the multi-LOD representation of the *** a certain proximity range from a given position,the method reconstructs a scene that preserves topological relations between the boundaries of geospatial features with the *** method also guarantees that certain nearest proximity to the given position consists of the best geometries that correspond to the original *** properties of the method close up the gap between a mere exploratory visualization of static,pre-generated models and the models supporting geospatial analysis,which is deemed crucial for applications in Geographic Information Systems,Building Information Modelling and other software industries.A prototype implementation and experiment results that prove this method are also prese

关键词： Feature-based topography multiple level-of-detail procedural modeling vector data organization geometry reconstruction

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Engineering Interlayer Hybridization in Energy Space via Dipolar Overlayers

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Chinese Physics Letters 2023年第8期40卷 92-98页

作者：邵斌姜肖 jan Berges 孟胜黄兵 College of Electronic Information and Optical Engineering and Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China Beijing Computational Science Research Center Beijing 100193China Institut für Theoretische Physik Bremen Center for Computational Materials Scienceand MAPEX Center for Materials and ProcessesUniversit?t BremenBremen D-28359Germany Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Beijing Normal UniversityBeijing 100875China

The interlayer hybridization(IH)of van der Waals(vdW)materials is thought to be mostly associated with the unignorable interlayer overlaps of wavefunctions(t)in real ***,we develop a more fundamental understanding of IH by introducing a new physical quantity,the IH admixture ratioα.Consequently,an exotic strategy of IH engineering in energy space can be proposed,i.e.,instead of changing t as commonly used,αcan be effectively tuned in energy space by changing the on-site energy difference(2Δ)between neighboring-layer *** practice,this is feasible via reshaping the electrostatic potential of the surface by deposing a dipolar overlayer,e.g.,crystalline *** first-principles calculations unveil that IH engineering via adjusting 2Δcan greatly tune interlayer optical transitions in transition-metal dichalcogenide bilayers,switch different types of Dirac surface states in Bi_(2)Se_(3)thin films,and control magnetic phase transition of charge density waves in 1H/1T-TaS_(2)bilayers,opening new opportunities to govern the fundamental optoelectronic,topological,and magnetic properties of vdW systems beyond the traditional interlayer distance or twisting engineering.

关键词： interlayer neighboring electrostatic

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A LIOUVILLE THEOREM FOR STATIONARY INCOMPRESSIBLE FLUIDS OF VON MISES TYPE

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Acta Mathematica Scientia 2019年第1期39卷 1-10页

作者： Martin FUCHS jan MüLLER Fachbereich 6.1 Mathematik Universit?t des Saarlandes

We consider entire solutions u of the equations describing the stationary flow of a generalized Newtonian fluid in 2 D concentrating on the question, if a Liouville-type result holds in the sense that the boundedness of u implies its constancy. A positive answer is true for p-fluids in the case p > 1(including the classical Navier-Stokes system for the choice p = 2), and recently we established this Liouville property for the Prandtl-Eyring fluid model,for which the dissipative potential has nearly linear growth. Here we finally discuss the case of perfectly plastic fluids whose flow is governed by a von Mises-type stress-strain relation formally corresponding to the case p = 1. It turns out that, for dissipative potentials of linear growth, the condition of μ-ellipticity with exponent μ < 2 is sufficient for proving the Liouville theorem.

关键词： generalized Newtonian fluids perfectly plastic fluids von Mises flow Liouville theorem

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On linear observers and application to fault detection in synchronous generators

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Control Theory and Technology 2014年第4期12卷 345-356页

作者： jan Erik STELLET Tobias ROGG Karlsruhe Institute of Technology Swiss Federal Institute of Technology

This work introduces an observer structure and highlights its distinct advantages in fault detection and isolation. Its application to the issue of shorted turns detection in synchronous generators is demonstrated. For the theoretical foundation, the convergence and design of Luenberger-type observers for disturbed linear time-invariant （LTI） single-input single-output （SISO） systems are reviewed with a particular focus on input and output disturbances. As an additional result, a simple observer design for stationary output disturbances that avoids a system order extension, as in classical results, is proposed.

关键词： Synchronous generators Field winding Fault detection Unknown input observer (UIO) Disturbance observer Residual generation

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Experimental and Numerical Simulations of Flow and Heat Transfer in Heat Exchanger Elements Using Liquid Crystal Thermography

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Journal of Thermal Science 2004年第2期13卷 133-137页

作者： jan STASIEK Michele CIOFALO Maciej WIERZBOWSKI Heat Technology Dept. Gdansk Univ. of Technology Narutowicza 11/12 80-952 Gdansk PolandUniversity of Palermo Dipartimento Ingeneria Nucleare Viale delle Scienze I-90128 Palermo ItalyHeat Technology Dept. Gdansk Univ. of Technology Narutowicza 11/12 80-952 Gdansk Poland

Experimental and numerical investigation of heat transfer and fluid flow were conducted for classic heat exchanger elements (flat plate with fin-tubes in-line, staggered and with vortex generators) and corrugated-undulated ducts under transitional and weakly turbulent *** dependence of average heat transfer and pressure drop on Reynolds number and geometrical parameters was investigated. Distributions of local heat transfer coefficient were obtained by using liquid crystal thermography and surface-averaged values were computed. Three-dimensional numerical simulations were conducted by a finite-volume method using a low-Reynolds number k-e model under the assumption of fully developed flow. Computed flow fields provided otherwise inaccessible information on the flow patterns and the mechanisms of heat transfer enhancement.

关键词： liquid crystal thermography heat transfer enhancement.

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The Efficacy of the Application of Highly Specialised Surface Engineering Methods in the Economy. Case Study.

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材料热处理学报 2004年第05B期25卷 1321-1324页

作者： Adam Mazurkiewicz Jerzy Smolik jan Walkowicz Institute for Terotechnology Pulaskiego 6/10 Radom 26-600 PolandInstitute for Terotechnology Pulaskiego 6/10 Radom 26-600 PolandInstitute for Terotechnology Pulaskiego 6/10 Radom 26-600 Poland

The development of materials technologies, including surface engineering is one of the main trends in the knowledge-based economy. The direct advantages of the application of these technologies are the energy and raw materials saving and the lack of negative influence on the natural environment. The disadvantages are the high equipment and operating costs, the requirement of the highest service qualifications and the necessity to develop specialized technological solutions for different kinds of applications, tools and processes. The potential economic and practical effects are so significant that except for new scientific and technological solutions new innovative organizational solutions are being searched. They should enable an extensive application of innovations in all economy sectors, including SMEs, so the investment possibilities and specialized skills would not constitute decisive limitations. A concept, assumptions, principles of operation and practical implementation of such a model organisational structure - Plasma Technologies Centre of the Institute for Terotechnology (ITeE Radom, Poland) are presented in the article. Development trends directly correlated with the needs of the national market and economy as well as network connections within Framework Programmes of the European Union are depicted. Examples of several highly specialised technological solutions (out of a few dozen solutions implemented in the PTC) and their technological efficacy are described.

关键词：表面工程经营活动经济效益技术功效

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Close up observation and inversion of low-altitude ENA emissions during a substorm event

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Science China Earth Sciences 2019年第6期62卷 1024-1032页

作者： Li LU Susan MCKENNA-LAWLOR jan BALAZ National Space Science Center of the Chinese Academy of Sciences Space Technology Ireland Ltd. Maynooth Co.Kildare Institute of Experimental Physics

During a series of substorm events on November 12 2004, the Neutral Atom Detector Unit(NUADU) flying onboard the TC-2 spacecraft observed, close to perigee, bright low-altitude Energetic Neutral Atom(ENA) emissions from both north and south poles. Through utilizing high temporal and spatial resolution data inversion techniques we present here a global view the associated processes of energetic ion deposition and injection at the uniquely high temporal resolution of a few minutes. It is demonstrated that the ENA emissions observed came mainly from the, low-altitude, high magnetic latitude polar region. Since precipitating ions follow magnetic field lines and have more chance to produce ENA emissions through charge exchange ***, the employment of a low-orbit satellite to record at high temporal and spatial resolution ENA image data is inferred to be the best way to monitor those dynamic ring current variations that occur during geomagnetic activity.

关键词： Low-altitude ENA emissions ENA image inversion Pitch angle distribution Ion injection Ion deposition

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Deep learning for the internet of things:Potential benefits and use-cases

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Digital Communications and Networks 2021年第4期7卷 526-542页

作者： Tausifa jan Saleem Mohammad Ahsan Chishti Department of Computer Science and Engineering National Institute of TechnologySrinagarJ&KIndia

The massive number of sensors deployed in the Internet of Things(IoT)produce gigantic amounts of data for facilitating a wide range of *** Learning(DL)would undoubtedly play a role in generating valuable inferences from this massive volume of data and hence will assist in creating smarter *** this regard,exploring the potential of DL for IoT data analytics becomes highly *** paper begins with a concise discussion on the Deep Neural Network(DNN)and its different *** potential benefits that DL will bring to the IoT are also ***,a detailed review of DL-driven IoT use-cases is ***,this paper formulates a DL-based model for Human Activity Recognition(HAR).It carries out a performance comparison of the proposed model with other machine learning techniques to delineate the superiority of the DL model over other *** from enlightening the potential of DL in IoT applications,this paper will serve as an impetus to encourage advanced research in the realm of DL-driven IoT applications.

关键词： Internet of things(IoT) Deep learning Convolutional neural network Recurrent neural network Long short term memory

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Impact of agricultural landscape structure on the patterns of bird species diversity at a regional scale

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Avian Research 2023年第4期14卷 600-610页

作者： Denisa Dvorakova jan Sipos Josef Suchomel Department of Zoology FisheriesHydrobiology and ApicultureMendel University in BrnoZemedelska 161300BrnoCzech Republic

The loss of bird species diversity is a crucial problem in the European agricultural *** in the area coverage of major land cover types has been mentioned as one of the main factors responsible for bird biodiversity *** this study,we focused on the impact of landscape matrix characteristics on bird species richness and on Faith’s phylogenetic diversity index on a spatial scale of 1000-m radius around the measured occurrence *** investigated how land cover composition affects bird diversity on the landscape scale using nationwide citizen science *** total,168,739 records of bird occurrence in the South Moravian Region of the Czech Republic during growing season from 2009 to 2019 were *** found that the presence of water bodies and wetlands significantly corresponded to the areas of highest bird species *** also revealed that the presence of forests(~60%of the forest in the Czech Republic is occupied by commercial forests),urban areas and arable land were negatively associated with bird species richness and phylogenetic ***(both coniferous and deciduous)and urban habitats were found to have a tendency to host a clustered phylogenetic community structure in comparison with wetland and arable land.A strong negative association between forest proportion and bird diversity led us to conclude that the expansion of the forest(with simple species composition,horizontal and vertical structure)could be one of the critical drivers of the decline of bird species diversity in the European agricultural *** the other hand,our results also pointed out that small woody features(i.e.,woodlots)and scattered woodland shrub vegetation were one of the main landscape characteristics supporting a bird diversity in rural *** is in concordance with other studies which mention these landscape structures as important elements for nesting and foraging of farmland *** thus recommend to maintain and restor

关键词： Bird occurrence Citizen science Conservation Landscape influence Phylogenetic diversity Spatial heterogeneity

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Characterization of image spaces of Riemann-Liouville fractional integral operators on Sobolev spaces W^(m,p)(Ω)

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Science China Mathematics 2021年第12期64卷 2611-2636页

作者： Lijing Zhao Weihua Deng jan S.Hesthaven School of Mathematics and Statistics Northwestern Polytechnical UniversityXi'an 710129China School of Mathematics and Statistics Gansu Key Laboratory of Applied Mathematics and Complex SystemsLanzhou UniversityLanzhou 730000China EPFL-SB-MATHICSE-MCSS Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland

Fractional operators are widely used in mathematical models describing abnormal and nonlocal *** there are extensive numerical methods for solving the corresponding model problems,theoretical analysis such as the regularity result,or the relationship between the left-side and right-side fractional operators is seldom *** of considering the fractional derivative spaces,this paper starts from discussing the image spaces of Riemann-Liouville fractional integrals of L_(p)(Ω) functions,since the fractional derivative operators that are often used are all *** the high regularity situation-the image spaces of Riemann-Liouville fractional integral operators on the W^(m,p)(Ω) space is *** characterizations of the defined spaces,as well as those of the intersection of the left-side and right-side spaces are *** behavior of the functions in the defined spaces at both the nearby boundary point/points and the points in the domain is demonstrated in a clear ***,tempered fractional operators are shown to be reciprocal to the corresponding Riemann-Liouville fractional operators,which is expected to contribute some theoretical support for relevant numerical ***,we also provide some instructions on how to take advantage of the introduced spaces when numerically solving fractional equations.

关键词： image space Riemann-Liouville integral regularity property approximation

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