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Special Issue on “Topological photonics and beyond:novel concepts and recent advances”

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Light(Science & Applications) 2020年第1期9卷 31-35页

作者： Zhigang Chen hrvoje Buljan Daniel Leykam TEDA Applied Physics Institute and School of Physics Nankai UniversityTianjin 300457China Department of Physics and Astronomy San Francisco State UniversitySan FranciscoCA 94132USA Department of Physics Faculty of ScienceUniversity of ZagrebBijenicka cesta 3210000 ZagrebCroatia Centre for Quantum Technologies National University of Singapore3 Science Drive 2Singapore 117543Singapore

The discovery of topological phases and topological insulators has revolutionized several fields of natural science,including condensed matter physics,materials science,and *** concepts have been implemented in a variety of materials and in a broad range of wave systems ranging from electronic,atomic,photonic,plasmonic,polaritonic,to microwave,acoustic,and mechanical waves.

关键词： topological microwave condensed

Role of quantum dots nanoparticles in the chemical treatment of colored wastewater: Catalysts or additional pollutants

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Journal of Environmental Sciences 2011年第9期23卷 1479-1485页

作者： hrvoje Kusic Danuta Leszczynska Natalija Koprivanac Igor Peterne Civil and Environmental Engineering Department Jackson State University Faculty of Chemical Engineering and Technology University of Zagreb

The objective of the study was to investigate the presence and the activity of quantum dots nanoparticles in colored *** special interest is devoted to the investigation of their role in the typical treatment of water or wastewater,studying their influence on the effectiveness of applied treatments *** standard chemical processes for water treatment and disinfection （direct UV photolysis and direct ozonation） were applied for the degradation of colored organic pollutant,reactive azo dye,in the presence/absence of CdSe/ZnS core-shells quantum *** obtained results indicated that investigated nanoparticles inhibit the overall efficiency of applied processes,especially in the case of direct UV photolysis,although catalytic effect might be expected in part due to the semiconductor nature of quantum *** results lead to a conclusion that CdSe/ZnS nanoparticles behave as additional pollutants in the *** should be removed from the system prior the treatment,because their presence could decrease the efficiency,i.e.,prolong the time of treatment and correspondingly increase the costs of the treatment process.

关键词： wastewater treatment CdSe/ZnS core-shells reactive azo dye UV irradiation ozone

Efficient video-on-demand services over mobile datacast channels

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 873-884页

作者： JENKA hrvoje STOCKHAMMER Thomas ABDEL SAMAD Wissam Institute for Communications Engineering Munich University of Technology Munich 80333 Germany Nomor Research Bergen 83346 Germany BenQ Mobile Munich 81675 Germany

The integration of reliable Video-on-Demand (VoD) broadcasting schemes in the DVB-h transmission system is studied, exemplary for Pyramid Broadcasting (PB). Sophisticated VoD broadcasting schemes such as PB allow receivers to tune into the ongoing transmission of a video-stream at arbitrary time, while still being able to receive the multimedia sequence from the beginning to end, after a short initial playout latency. Raptor coding, integrated in the FLUTE protocol, is combined with the traditional PB scheme in order to provide high service and presentation reliability. We give a short overview on the DVB-h transmission system as well as on the FLUTE protocol. We present and discuss options for the integration of VoD broadcasting schemes in combination with Raptor coding. We achieve backward-compatibility even with terminals not supporting Raptor coding. Simulation results show the benefits of the discussed VoD scheme compared to existing carousel approaches in DVB-h.

关键词： Video-on-Demand (VoD) DVB-h Pyramid broadcasting FLUTE protocol Raptor code

A framework for efficient irregular wave simulations using Higher Order Spectral method coupled with viscous two phase model

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Journal of Ocean Engineering and Science 2017年第4期2卷 253-267页

作者： Inno Gatin Vuko Vukčević hrvoje Jasak Faculty of Mechanical Engineering and Naval Architecture University of ZagrebIvana Lučića 5ZagrebCroatia Wikki Ltd. 459 Southbank HouseSE17SJ LondonUnited Kingdom

In this paper a framework for efficient irregular wave simulations using Higher Order Spectral method coupled with fully nonlinear viscous,two-phase Computational Fluid Dynamics(CFD)model is *** model is based on solution decomposition via Spectral Wave Explicit Navier-Stokes Equation method,allowing efficient coupling with arbitrary potential flow *** Order Spectrum is a pseudo-spectral,potential flow method for solving nonlinear free surface boundary conditions up to an arbitrary order of *** is capable of efficient long time nonlinear propagation of arbitrary input wave spectra,which can be used to obtain realistic extreme *** facilitate the coupling strategy,Higher Order Spectrum method is implemented in foam-extend alongside the CFD *** of the Higher Order Spectrum method is performed on three test cases including monochromatic and irregular wave ***,the coupling between Higher Order Spectrum and CFD is validated on three hour irregular wave ***,a simulation of a 3D extreme wave encountering a full scale container ship is shown.

关键词： Higher Order Spectral method Irregular waves Extreme waves CFD Foam-extend

On the Nature of the P-Wave Velocity Gradient in the Inner Core beneath Central America

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Journal of Earth Science 2013年第5期24卷 699-705页

作者： hrvoje Tkali Thomas Bodin Mallory Young Malcolm Sambridge Research School of Earth Sciences the Australian National University Berkeley Seismological Laboratory University of California at Berkeley

We conduct an experiment to investigate whether linearity in the observed velocity gradient in the volume of the inner core sampled by the PKP ray paths beneath Central America is a robust approximation. Instead of solving an optimization problem, we approach it within the Bayesian inference. This is an ensemble approach, where model specification is relaxed so that in- stead of only one solution, groups of reasonable models are acceptable. Furthermore, in transdimen- sional Bayesian inference used here, the number of basis functions needed to model observations is by itself an unknown. Our modeling reveals that in the ensemble of models, the most likely are those containing only 2 nodes （linear trend）. Thus our result justifies the assumption used for the deter- mination of inner core rotation with respect to the rest of the mantle that the observed gradient is constant in its nature （linear）. Recent observations in seismology suggest that it is likely that the spa- tial variability in elastic parameters is a widespread phenomenon in the inner core. Future array observations will further constrain spatial extent and magnitude of velocity changes and show whether there is a significant difference between these observations in the two quasi-hemispheres of the inner core.

关键词： solid earth physics deep geophysics.

Monolithic Coupling of the Pressure and Rigid Body Motion Equations in Computational Marine Hydrodynamics

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Journal of Marine Science and Application 2017年第4期16卷 375-381页

作者： hrvoje Jasak Inno Gatin Vuko Vukcevic Faculty of Mechanical Engineering and Naval Architecture University of Zagreb 10000 Zagreb Croatia

In Fluid Structure Interaction(FSI) problems encountered in marine hydrodynamics, the pressure field and the velocity of the rigid body are tightly coupled. This coupling is traditionally resolved in a partitioned manner by solving the rigid body motion equations once per nonlinear correction loop, updating the position of the body and solving the fluid flow equations in the new configuration. The partitioned approach requires a large number of nonlinear iteration loops per time–step. In order to enhance the coupling, a monolithic approach is proposed in Finite Volume(FV) framework,where the pressure equation and the rigid body motion equations are solved in a single linear system. The coupling is resolved by solving the rigid body motion equations once per linear solver iteration of the pressure equation, where updated pressure field is used to calculate new forces acting on the body, and by introducing the updated rigid body boundary velocity in to the pressure equation. In this paper the monolithic coupling is validated on a simple 2D heave decay case. Additionally, the method is compared to the traditional partitioned approach(i.e. "strongly coupled" approach) in terms of computational efficiency and accuracy. The comparison is performed on a seakeeping case in regular head waves, and it shows that the monolithic approach achieves similar accuracy with fewer nonlinear correctors per time–step. Hence, significant savings in computational time can be achieved while retaining the same level of accuracy.

关键词： monolithic coupling pressure equation rigid body motion computational fluid dynamics marine hydrodynamics seakeeping

Quantitative genetic analysis of chlorophyll a fluorescence parameters in maize in the field environments

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Journal of Integrative Plant Biology 2014年第7期56卷 695-708页

作者： Domagoj ?imi? hrvoje Lepedu? Vlatka Jurkovi? Jasenka Antunovi? Vera Cesar Agricultural Institute Osijek Faculty of Humanities and Social Sciences Department of Biology Josip Juraj Strossmayer University of Osijek

Chlorophyl fluorescence transient from initial to maximum fluorescence （“P”step） throughout two intermedi-ate steps （“J”and“I”）（JIP-test） is considered a reliable early quantitative indicator of stress in plants. The JIP-test is particularly useful for crop plants when applied in variable field environments. The aim of the present study was to conduct a quantitative trait loci （QTL） analysis for nine JIP-test parameters in maize during flowering in four field environ-ments differing in weather conditions. QTL analysis and identification of putative candidate genes might help to explain the genetic relationship between photosynthesis and different field scenarios in maize plants. The JIP-test param-eters were analyzed in the intermated B73 ？ Mo17 （IBM） maize population of 205 recombinant inbred lines. A set of 2,178 molecular markers across the whole maize genome was used for QTL analysis revealing 10 significant QTLs for seven JIP-test parameters, of which five were co-localized when combined＆amp;nbsp;over the four environments indicating polygenic inheritance and pleiotropy. Our results demonstrate that QTL analysis of chlorophyl fluorescence parameters was capable of detecting one pleiotropic locus on chromosome 7, coinciding with the gene gst23 that may be associated with efficient photosynthe-sis under different field scenarios.

关键词： Chlorophyll a fluorescence parameters field conditions intermated B73× Mo17 recombinant inbred lines JIP-test maize (Zeamays L.) quantitative trait loci

Bidding Strategy of a Virtual Power Plant Considering Carbon-electricity Trading

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CSEE Journal of Power and Energy Systems 2019年第3期5卷 306-314页

作者： Dechang Yang Shaowen He Qiuyue Chen Dingqian Li hrvoje Pandzic China Agricultural University BeijingChina Faculty of Electrical Engineering and Computing University of ZagrebCroatia

Virtual power plant(VPP)aggregates large amounts of distributed energy and controllable *** comprehensive consideration of carbon emissions and electricity transactions has great significance in improving the VPP operation’s economic *** this paper,the bidding strategy of the VPP by considering the carbon-electricity integration trading in an auxiliary service(AS)market is *** of all,the basic structure and operating features of the VPP are briefly ***,the bidding strategy model of carbon-electricity integration trading in an auxiliary service market is proposed and the corresponding objective function and the constraint conditions are also ***,the GAMS solver is utilized to give the optimal solution of the bidding strategy ***,the effectiveness of the bidding strategy of a VPP based on the consideration of carbon-electricity integration trading is verified through simulation cases.

关键词： Bidding strategy carbon-electricity distribution energy resource integration trading virtual power plant

Changes in intraocular pressure after intraocular eye surgery——the influence of measuring technique

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International Journal of Ophthalmology(English edition) 2019年第6期12卷 967-973页

作者： hrvoje Kovacic Roger C.W.Wolfs Emine Kilic Wishal D.Ramdas Department of Ophthalmology Erasmus Medical Center

AIM: To investigate the changes in intraocular pressure(IOP) before and after intraocular surgery measured with Goldmann applanation tonometry(GAT) and pascal dynamic contour tonometry(PDCT), and assessed their ***: Patients who underwent trans pars plana vitrectomy(TPPV) with or without cataract extraction(CE) were included. The IOP was measured in both eyes with GAT and PDCT pre-and postoperatively, where the nonoperated eyes functioned as ***: Preoperatively, mean IOP measurements were 16.3±6.0 mm Hg for GAT and 12.0±2.8 mm Hg for PDCT for the operated eyes. Postoperatively, the mean IOP dropped to 14.3±5.6 mm Hg for GAT(P=0.011) and rose up to 12.7±2.6 mm Hg for PDCT(P=0.257). Bland-Altman analysis showed a poor agreement between GAT and PDCT with a mean difference of 2.9 mm Hg preoperatively and 95% limits of agreement ranging from -3.2 to 9.0 mm Hg. Postoperatively, the mean difference was 1.2 mm Hg with 95% limits of agreement ranging from-8.3 to 10.7 mm Hg. There were no significant differences between the TPPV and TPPV+CE group, except when measured with PDCT postoperatively(P=0.012).CONCLUSION: The IOP is reduced after surgery when measured with GAT and remained stable when measured with PDCT. However, the agreement between GAT and PDCT is poor. Although PDCT may be a more accurate predictor of the true IOP, it seems less suitable for daily use in the clinical practice.

关键词： glaucoma intraocular pressure intraocular surgery trans pars plana vitrectomy