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GAJA:3D CAD methodology for developing a parametric system for the automatic(re)modeling of the cutting components of compound washer dies

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第5期14卷 327-340页

作者： David POTONIK bojan dolak Miran ULBIN Emo-orodjarna d.o.o. Bezigrajska 10SI-3000CeljeSlovenia Faculty of Mechanical Engineering University of MariborSmetanova 17SI-2000MariborSlovenia

For the designing of cutting-dies is a complex and experience-based process,it is poorly supported by conventional 3D CAD ***,the majority of design activities,including the(re)modeling of those cutting die-components that are directly responsible for performing shaping operations on a sheet-metal stamping part,traditionally still need to be carried-out repetitively,separately,and manually by the *** eliminate some of these drawbacks and upgrade the capabilities of conventional 3D CAD software,this paper proposes a new methodology for the development of a parametric system capable of automatically performing a(re)modeling process of compound washer dies' *** presented methodology integrates CATIA V5 built-in modules,including Part Design,Assembly Design and Knowledge Advisor,publication mechanism,and compound cutting die-design *** system developed by this methodology represents an 'intelligent' assembly template composed of two modules GAJA1 and GAJA2,***1 is responsible for the direct input of the die-design problem regarding the shape,dimensions and material of the stamping part,its extraction in the form of geometric features,and the transferring of relevant design parameters and features to the module ***2 interprets the current values for the input parameters and automatically performs the modeling process of cutting die-components,using die-design knowledge and the company's internal design and manufacturing *** results show that this system significantly shortens the modeling-time for cutting the die-components,improves the modeling-quality,and enables the training of inexperienced designers.

关键词： Parametric modeling Cutting dies Computer-aided systems Knowledge-based design

Characterization of Arithmetic Functions that Preserve the Sum-of-squares Operation

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Acta Mathematica Sinica,English Series 2014年第4期30卷 689-695页

作者： bojan BAI Department of Mathematics and Informatics University of Novi Sad

We characterize all functions f ： N → C such that f（m^2 ＋ n^2） = f（m）^2 ＋ f（n）^2 for all m, n ∈ N. It turns out that all such functions can be grouped into three families, namely f ≡ 0, f（n） = ±n （subject to some restrictions on when the choice of the sign is possible） and f（n） =±l/2（again subject to some restrictions on when the choice of the sign is possible）.

关键词： Arithmetic function functional equation sum of squares

Real-time raster projection for web maps

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International Journal of Digital Earth 2016年第3期9卷 215-229页

作者： Bernhard Jenny bojan Šavrič Johannes Liem College of Earth Oceanand Atmospheric SciencesOregon State UniversityCorvallisORUSA

The virtual globe is the default visualization for Digital Earth applications,but it can only show one half of the *** article introduces user-adjustable,on-the-fly projection of georeferenced raster images for web mapping and web GIS *** technique allows users to center a map on arbitrary locations,while still seeing the entire Earth *** web mapping libraries can apply map projection transformations to vector data in the browser,but they do not currently support the projection of raster images at interactive frame *** use the cross-platform WebGL(Web Graphics Library)graphics pipeline for hardware-accelerated projection of raster data in web *** algorithmic techniques–inverse per-fragment projection,and combined forward per-triangle and inverse per-fragment projection–for georeferenced raster imagery are *** resulting raster maps combine the ease of use and flexibility of interactive virtual globes with the ability to show the entire *** adjustable projection of raster imagery allows users to observe global phenomena that are difficult to visualize on virtual globes or traditional maps with static projections.

关键词： map projection raster projection WebGL

Bile acid signaling through farnesoid X and TGR5 receptors in hepatobiliary and intestinal diseases

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Hepatobiliary & Pancreatic Diseases International 2015年第1期14卷 18-33页

作者： bojan Stanimirov Karmen Stankov Momir Mikov Department of Pharmacology Toxicology and Clinical Pharmacology Faculty of Medicine University of Novi Sad Clinical Centre of Vojvodina Faculty of Medicine University of Novi Sad School of Pharmacy Curtin University

BACKGROUND： The well-known functions of bile acids（BAs） are the emulsification and absorption of lipophilic xenobiotics. However, the emerging evidences in the past decade showed that BAs act as signaling molecules that not only autoregulate their own metabolism and enterohepatic recirculation, but also as important regulators of integrative metabolism by activating nuclear and membrane-bound G protein-coupled receptors. The present review was to get insight into the role of maintenance of BA homeostasis and BA signaling pathways in development and management of hepatobiliary and intestinal *** SOURCES： Detailed and comprehensive search of PubM ed and Scopus databases was carried out for original and review ***： Disturbances in BA homeostasis contribute to the development of several hepatobiliary and intestinal disorders, such as non-alcoholic fatty liver disease, liver cirrhosis, cholesterol gallstone disease, intestinal diseases and both hepatocellular and colorectal ***： Further efforts made in order to advance the understanding of sophisticated BA signaling network may be promising in developing novel therapeutic strategies related not only to hepatobiliary and gastrointestinal but also systemic diseases.

关键词： bile acid metabolism non-alcoholic fatty liver disease cholestatic liver diseases gallstone disease intestinal disease hepatocellular carcinoma

Population specific fitness response of Drosophila subobscura to lead pollution

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Insect Science 2013年第2期20卷 245-253页

作者： bojan Kenig Marina Stamenkovic-Radak Marko Andelkovic Institute for Biological Research Sinia Stankovic University of Belgrade Faculty of Biology University of Belgrade Serbian A cademy of Sciences and Arts Belgrade Serbia

Differences in heavy metal tolerance among separate populations of the same species have often been interpreted as local adaptation. Persistence of differences after removing the stressor indicates that mechanisms responsible for the increased tolerance were genetically determined. Drosophila subobscura Collin （Diptera： Drosophilidae） pop- ulations were sampled from two localities with different history of heavy metal pollution, and reared for eight generations in the laboratory on a standard medium and on media with different concentrations of lead （Pb）. To determine whether flies from different natural populations exposed to the Pb-contaminated media in the laboratory show population spe- cific variability in fitness components over generations, experimental groups with different concentrations of lead were assayed in three generations （F2, Fs, and Fs） for fecundity, de- velopmental time, and egg-to-adult viability. On the contaminated medium, fecundity was reduced in later generations and viability was increased, irrespective of the environmental origin of populations. For both populations, developmental time showed a tendency of slowing down on media with lead. Faster development was observed in later generations. Preadaptation to contamination, meaning higher fecundity, higher viability, and faster egg to adult development in all studied generations, was found in D. subobscura originating from the locality with a higher level of heavy metal pollution,

关键词： environmental background fitness components heavy metal interpopulation differences laboratory evolution local adaptation

Proper ties of core-EP order in rings with involution

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Frontiers of Mathematics in China 2019年第4期14卷 715-736页

作者： Gregor dolINAR bojan KUZMA Janko MAROVT Burcu UNGOR University of Ljubljana Faculty of Elec trical Engineering Trzaska 25 SI-1000 Ljubljana Slovenia University of Primorska Glagoljaska 8 SI-6000 Koper Slovenia University of Maribor Faculty of Economics and Business Razlagova 14 SI-2000 Maribor Slovenia IMFM Jadranska 19 SI-1000 Ljubljana Slovenia Faculty of Sciences Ankara University 06100 Tandogan Ankara Turkey

We study properties of a relation in *-rings, called the core-EP (pre)order which was introduced by H. Wang on the set of all n × n complex matrices [Linear Algebra Appl., 2016, 508: 289-300] and has been recently generalized by Y. Gao, J. Chen, and Y. Ke to *-rings [Filomat, 2018, 32: 3073- 3085]. We present new characterizations of the core-EP order in *-rings with identity and introduce the notions of the dual core-EP decomposition and the dual core-EP order in *-rings.

关键词： Drazin inverse core-EP decomposition pre-order ring

An Application of the Shark Skin Denticle Geometry for Windbreak Fence Design and Fabrication

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Journal of Bionic Engineering 2017年第3期14卷 579-587页

作者： Ivana Bajsanski Vesna Stojakovic bojan Tepavcevic Marko Jovanovic Dejan Mitov Department of Architecture Faculty of Technical Sciences University of Novi Sad Trg Dositeja Obradoviea 6 21000 Novi Sad Serbia

Windbreak fences in open and urban areas can be used to effectively reduce the wind velocity. In this paper we examine how the geometrical shape of the windbreak fence can optimally mitigate wind velocity. We propose an approach for windbreak fence design based on a bionic parametric model of the shark skin denticle geometry, which improves the reduction of the wind velocity around and behind the windbreak fences. The generative model was used to estimate improvements by variations in the parameters of the fence panel＇s geometrical shape, inspired by shark skin denticles. The results of the Computational Fluid Dynamics （CFD） analysis indicates that the fence surface inspired by shark skin performs much better than both flat and cor- rugated surfaces. Taking into account the complex geometry of the surface inspired by shark skin denticles, we propose a fab- rication process using an expanded polystyrene foam （EPS） material, created using an industrial robot arm with a hot-wire tool. Creating EPS moulds for the shark skin denticle panels allows for a richer variety material to be used in the final design, leading both to higher efficiency and a more attractive design.

关键词： bioinspiration shark skin denticle windbreak fence design generative models CFD

Second-Order Invariant Domain Preserving ALE Approximation of Euler Equations

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Communications on Applied Mathematics and Computation 2023年第2期5卷 923-945页

作者： Jean-Luc Guermond bojan Popov Laura Saavedra Department of Mathematics Texas A&M UniversityCollege StationUSA Departamento de Matemática Aplicada a la Ingeniería Aeroespacial Universidad Politécnica de MadridMadridSpain

An invariant domain preserving arbitrary Lagrangian-Eulerian method for solving non-linear hyperbolic systems is *** numerical scheme is explicit in time and the approximation in space is done with continuous finite *** method is made invar-iant domain preserving for the Euler equations using convex limiting and is tested on vari-ous benchmarks.

关键词： Conservation equations Hyperbolic systems Arbitrary Lagrangian-Eulerian Moving meshes Invariant domains High-order method Convex limiting Finite element method

Electrochemical inactivation of cyanobacteria and microcystin degradation using a boron-doped diamond anode-A potential tool for cyanobacterial bloom control

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Journal of Environmental Sciences 2017年第3期29卷 248-261页

作者： Andrej Meglic Anja Pecman Tinkara Rozina Domen Lestan bojan Sedmak Arhel Ltd. Pustourhoua c.63SI-1000 LjubljanaSlovenia Centre for Soil and Environmental Sciences Biotechnical FacultyUniversity of LjubljanaJamnikarjeva 101SI-1000 LjubljanaSlovenia Envit Ltd. Vojkova c.63SI-1000 LjubljanaSlovenia Department of Genetic Toxicology and Cancer Biology National Institute of BiologyVecna pot 111SI-1000 LjubljanaSlovenia

Cyanobacterial blooms are global phenomena that can occur in calm and nutrient-rich （eutrophic） fresh and marine waters. Human exposure to cyanobacteria and their biologically active products is possible during water sports and various water activities, or by ingestion of contaminated water. Although the vast majority of harmful cyanobacterial products are confined to the interior of the cells, these are eventually released into the surrounding water following natural or artificially induced cell death. Electrochemical oxidation has been used here to damage cyanobacteria to halt their proliferation, and for microcystin degradation under in-vitro conditions. Partially spent Jaworski growth medium with no addition of supporting electrolytes was used. Electrochemical treatment resulted in the cyanobacterial loss of cell-buoyancy regulation, cell proliferation arrest, and eventual cell death. Microcystin degradation was studied separately in two basic modes of treatment： batch-wise flow, and constant flow, for electrolytic-cell exposure. Batch-wise exposure simulates treatment under environmental conditions, while constant flow is more appropriate for the study of boron-doped diamond electrode efficacy under laboratory conditions. The effectiveness of microcystin degradation was established using high-performance liquid chromatography-photodiode array detector analysis, while the biological activities of the products were estimated using a colorimetric protein phosphatase-1 inhibition assay. The results indicate potential for the application of electro-oxidation methods for the control of bloom events by taking advantage of specific intrinsic ecological characteristics of bloom-forming cyanobacteria. The applicability of the use of boron-doped diamond electrodes in remediation of water exposed to cyanobacteria bloom events is discussed.

关键词： Cyanobacterial bloom controlBoron-doped diamond anodeElectro-oxidationMicrocystin degradationProtein phosphatase-1 inhibitionWater remediation