Fakultätskolloquium der Technischen Fakultät im WS2015/16

Die Kolloquien an den Instituten für Elektrotechnik und Informationstechnik sowie Materialwissenschaften:

Jeweils montags eine halbe Stunde vor Beginn der Vorträge, also um 16.45 Uhr, werden die Gastredner den Besuchern des Kolloquiums in einer zwanglosen Runde bei einer Tasse Kaffee in der "Eisdiele" (Eingangshalle Geb. D, neben dem "Aquarium") vorgestellt.

Ansprechpartnerin: Claudia Martin (Tel. 0431-8806068) cma@tf.uni-kiel.de

 

Die Kolloquien am Institut für Informatik:

Alle Vorträge finden - soweit nicht anders angegeben - im Raum Ü2/K des Instituts für Informatik (Ludewig-Meyn-Str. 2, Vorbau des Mathematischen Seminars) freitags um 14 Uhr c.t. statt. 45 Minuten vor Vortragsbeginn stehen Tee und Kaffee bereit.

Ansprechpartnerin: Jane Eitzen (Tel. 0431 880-4461)aktuell@informatik.uni-kiel.de

 

Wenn Sie die Einladungen per E-Mail erhalten möchten tragen Sie sich bitte in die Mailingliste ein.

 

Nachfolgend alle Vortragstermine in chronologischer Abfolge:

Kolloquiumsvortrag: Professor Arno Ehresmann, Universität Kassel (CINSaT) / 13.04.2015

13.04.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel:  Light-ion bombardment induced tailored domains in magnetic thin film systems

 

Abstract:

Artificial magnetic domain patterns can be fabricated in magnetic thin film systems by light-ion bombardment induced magnetic patterning. This technique enables a local modification of anisotropies, e.g., the unidirectional anisotropy in exchange bias layer systems or the perpendicular anisotropy in Co/ Au multilayers. Remanently stable magnetic patterns (tailored domains) may be created, where the geometry and the local anisotropy may be set independently without large changes in surface topography. These patterns allow also a tailoring of the associated magnetic strayfield landscapes over the surface of the magnetic layer system. The talk will discuss the fundamentals for fabricating such artificial domain patterns, their use in a variety of sensor concepts and the use of the associated stray field landscapes for positioning and controlled movement of small particles.

 

 

 

 

Prof. J. McCord

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Kolloquiumsvortrag: Prof. Dr. James Currie / 17.04.2015

17.04.2015 von 14:15 bis 15:45

Institut für Informatik, Ludewig-Meyn-Str. 2, Übungsraum 2

Titel: Growth rate of binary words avoiding xxxR

Abstract:

Consider the set of those binary words with no non-empty factors of the form xxxR. Du, Mousavi, Schaeffer, and Shallit asked whether this set of words grows polynomially or exponentially with length. In this talk, we demonstrate the existence of upper and lower bounds on the number of such words of length n, where each of these bounds is asymptotically equivalent to a (different) function of the form Cnlg n+c, where C, c are constants.


Prof. Nowotka

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Kolloquimsvortrag: Dr. Karsten Wegner, ETH Zurich / 20.04.2015

20.04.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium

Titel: Flame Manufacture of ZnO and other Metal Oxide Nanoparticles

 

Abstract:

Flame spray pyrolysis has evolved into an extremely versatile process for production of single and multicomponent oxide nanoparticles of almost all periodic table elements. Material development has been carried out mostly with laboratory reactors at g/h scale, now requiring transfer into an industrial production environment. Successful process scale-up to kg/h output has been achieved for instance for zirconia or iron phosphate whereas the transfer remained challenging for zinc oxide nanoparticles.
This prompted us to investigate flame synthesis of ZnO in more detail. Formation and growth of spherical and rod-like structures was tracked by sampling nanoparticles thermophoretically in-situ the reactor and analyzing their morphology by electron microscopy. Along with temperature measurements and process simulations, conditions for production of sphere-like particles and nanorods could be developed. Characterization of the surface chemistry revealed shape-dependent differences that could affect the performance of the powders in catalytic hydrogen production, one envisioned application.

Prof. Adelung

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Kolloquiumsvortrag: Prof. Dr. Nan Ma, Biomaterialforschung HZG / FU Berlin/ 27.04.2015

27.04.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiserstr. 2, Geb.C , Raum "Aquarium"

Titel: Stem cell and cardiac repair

 

 

Abstract:

 

Stem cell mediated therapies offer great regenerative potential to improve cardiac function and neovascularization in patients with cardiovascular disorder. Recently, numerous clinical and preclinical studies using different type of stem (progenitor) cells have demonstrated their promising therapeutic effect. However, the low rate of cell engraftment and survival in the ischemic tissue greatly limits their therapeutic efficacy. To achieve the maximal clinical benefits, Dr. Nan Ma and her team attempted to explore cell pre-selection, genetic enhancement, tissue engineering and protein and/or small molecule treatment approaches to further augment cell homing, engraftment and cell survival. In this presentation, Dr. Nan Ma will introduce you how to employ the novel cell-enhancement strategies to aid the stem cell treatment of ischemic heart disease. The presentation will also highlight the potential of applying genetic and chemical modulation to enhance stem cell therapeutic and latest progress on gaining mechanistic insights of stem cell-extracellular matrix interactions. Further, using Laser-Induced-Forward-Transfer (LIFT) cell printing techniques, we are able to produce functional cardiac patch. LIFT-based stem cell cardiac patches for the treatment of myocardial infarction might improve wound healing and functional preservation.

Prof. Selhuber-Unkel

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Kolloquiumsvortrag: Prof. Harald Giessen, Physikalisches Institut, Uni Stuttgart / 04.05.2015

04.05.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Complex functional plasmonics: from fundamentals to applications


Abatract: folgt

Prof. M. Elbahri

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Kolloquiumsvortrag: PD Dr. Oleg Petracic, Forschungszentrum Juelich GmbH / 18.05.2015

18.05.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Functional nanomaterials from self-assembled magnetic nanoparticles

 

 

Abstract:

Nanoparticles (NPs) can be considered as multi-functional 'building blocks' for novel materials with tunable physical and chemical properties. Magnetic NPs can be used e.g. for novel energy efficient data storage systems, spintronic devices or permanent magnets with improved properties. I will report on (1.) magnetic monomer NPs from FePt, MnO and iron oxide and (2.) heterodimer ('Janus') NPs consisting of a ferromagnetic (FM) FePt particle attached to an antiferromagnetic (AF) MnO particle. The monomer iron oxide NPs have a diameter of 15 or 20 nm. By applying them onto various substrates and also using various techniques, they form self-organized sub-monolayers, monolayers, multilayers or 3d supercrystals. The structure and magnetism of these assemblies has been investigated using grazing incidence small angle x-ray and neutron scattering, electron microscopy and magnetometry. In FePt@MnO heterodimer particle systems the close contact of the two subunits yields an exchange bias effect. The spin structure has been studied using neutron scattering.

Our results yield the perspective on how to tune the magnetic behavior of the individual building blocks on the one hand and the collective properties of the entire NP assembly on the other hand.

 References:

[1]       S. A. Claridge, A. W. Castleman, S. N. Khanna, C. B. Murray, A. Sen, and P. S. Weiss, ACS Nano 3, 244 (2009).

[2]       O. Petracic, Superlatt. Microstr. 47, 569 (2010).

[3]       S. Bedanta, A. Barman, W. Kleemann, O. Petracic, and T. Seki, Magnetic nanoparticles-
a subject for both fundamental research and applications,
J. Nanomater. 2013, 952540 (2013)

[4]       D. Mishra, D. Greving, G. A. Badini Confalonieri, J. Perlich, B.P. Toperverg, H. Zabel, and
O. Petracic, Growth modes of nanoparticle superlattice thin films, Nanotechnology 25, 205602 (2014)

[5]       S. Bedanta, O. Petracic, and W. Kleemann , Supermagnetism, Handbook of Magnetic Materials, Vol. 23, Ed. K.J.H. Buschow, Elsevier (2015)

 

 

 

 

 

Prof. McCord

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Kolloquiumsvortrag: Prof. Lene Oddershede, Niels Bohr Institut, Universität Kopenhagen / 01.06.2015

01.06.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Optical control and biomedical applications of HOT nanoparticles

Abstract:

Precise optical control over individual metallic nanoparticles has huge potential for nano-architectural purposes. The talk will commence by explaining how a focused laser beam can control not only the position, but also the orientation of a single nanoparticle [1]. While optically manipulating metallic nanostructures, it is worth noting that absorption and heating associated with resonant irradiation of metallic nanoparticles can be extreme [2]. Moreover, the heating of a nanoparticle cannot be theoretically predicted as the precise focal intensity distribution on the nanoscale is unknown and typically highly aberrated [3]. Utilizing a novel membrane-based assay we directly quantify the heating of an individual irradiated gold nanoparticle and show how this depends on laser power and particle size, shape, orientation and composition [4,5]. Also, our novel results show how the photo-thermal effect of metallic nanoparticles can be used to create localized heat gradients inside living cells, which is highly useful for targeted drug delivery and for photothermal treatment of cancers.

[1] Selhuber-Unkel et al., Quantitative optical trapping of single gold nanorods. Nano Letters, vol. 8, p. 2998-3003 (2008).

[2] Bendix et al., Direct measurements of heating by electromagnetically trapped gold nanoparticles on supported lipid bilayers, ACS Nano, vol. 4 p.2256-2262 (2010).

[3] Kyrsting et al., Mapping 3D focal intensity exposes the stable trapping positions of single nanoparticles. Nano Letters vol.13 p.31-35 (2013).

[4] Ma et al., Large-Scale Orientation Dependent Heating from a Single Irradiated Gold Nanorod. Nano Letters vol.12 p.3954-3960 (2012).

[5] Ma et al., Heat generation by irradiated complex composite nanostructures. Nano Letters, vol. 14 p.612-619 (2014).

 

Prof. Christine Selhuber-Unkel

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Kolloquiumsvortrag: Prof.Tamas Kerekes Aalborg Universität / DK / 08.06.2015

08.06.2015 von 17:15 bis 18:45

Institut für (Ost), Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel:  "Problem Based Learning – the Aalborg way"

Abstract:

Problem Based Learning (PBL) has been successfully applied at Aalborg University (AAU) since it was established in 1974. PBL is not only about rote learning. Every semester students work in a group with fellow students having different academic strengths and weaknesses, combining their common knowledge to solve a problem. The work should end in the submission of a semester report, describing the main problem, the objectives and the methodology how the problem was solved and how successful they were in achieving the objectives, detailing the results, including simulation, modelling and laboratory experiments.

Group members will need to collaborate with each other, define and divide the tasks for achieving the goals that they set in the beginning of the project. This way the group work will have an academic and social dimension at the same time, by which the students will learn how to work together with other people, a quality which is very important on the labor market/in industry.

PBL gives the opportunity to put theoretical knowledge into practice. By working with “real-life” problems, the students will not only gain professional experience, but they will also make good contacts, that can be used in the future in case of job applications. Furthermore, these “real-life” problems come from industrial partners/companies, therefore students will work with problems related to leading edge research, and their results/findings might be included in tomorrow’s commercial products.

Prof. Liserre

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Sonderkolloquiumsvortrag: Prof. Dr. Mario Bebendorf (Universität Bayreuth) / 09.06.2015

09.06.2015 von 10:15 bis 11:45

Institut für Informatik, CAP 4, Raum 715

Titel: Niedrigrang-Approximation von elliptischen Randwertproblemen bei stark variablen Koeffizienten

Abstract:

Hierarchische Matrizen erlauben es unter Anderem, die Inverse und die Faktoren der LU-Zerlegung von Finite-Element-Diskretisierungen elliptischer Randwertprobleme nachweislich mit logarithmisch-linearer Komplexität zu approximieren. Der entsprechende Beweis weist allerdings eine starke Abhängigkeit des lokalen Ranges vom Verhältnis des größten und kleinsten Koeffizienten des Differentialoperators bzgl. der "L²"-Norm aus, was in numerischen Experimenten allerdings nie beobachtet werden konnte. Im Vortrag zeigen wir, dass diese Abhängigkeit bei Wahl geeigneter Normen nicht besteht. Hieraus kann eine logarithmische Abhängigkeit bzgl. der "L²"-Norm abgeleitet werden.

Prof. Börm

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Kolloquiumsvortrag: Prof. Andreas Hütten - Universität Bielefeld / 15.06.2015

15.06.2015 von 17:15 bis 18:45

Institut für (Ost), Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Heusler alloys: fundamentals and applications

 

 

Abstract:
The triumphant advance of Heusler compounds can mainly be attributed to their unique band structure
enabling the realization of different physical properties such as ferromagnetism, semi- and superconductivity in one material class. As a consequence of the theoretically predictions of 100% spin polarized half- and full-Heusler compounds over the past decade, Heusler alloys are among the most promising materials class for future applications in magneto electronics. The resulting electronic structures as well as their magnetic properties will be used to identify potential areas of applications. Among these areas are magnetic logic, biosensors and granular GMR-sensors. Thin films made of Heusler compounds are not only relevant for spintronic applications. There is also great interest in the class of shape-memory compounds like X-Mn-Y (X=Ni, Co,Y= Ga, Sn, In) in thin films. For applications such as actuators, magnetic cooling and hybrid systems, thin films are often advantageous or mandatory. For magnetic cooling devices, thin films offer the advantage of a high surface to volume ratio. This allows a fast heat transfer. A general knowledge of the thin film influence on the martensitic transition (MT) is required for all these applications and will be discussed.

Prof. Faupel

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Kolloquiumsvortrag: Prof. Dr.-Ing. Dr.-Ing. habil. Robert Weigel / TU Erlangen

22.06.2015 von 17:15 bis 18:45

Institut für Materialwissenschaf UND Institut für Elektrotechnik und Informationstechnik, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Highly Integrated Wideband Microwave Sensors for Emerging Biomedical Applications

 

Abstract: One of the most important challenges of modern and aging societies that need to be addressed is the improvement of health and lifetime of individuals. In the last decade, immense progress has been made in electronics based on nanoelectronics technologies in conjunction with complex smart and embedded system realizations. The current development trends in these key technologies are going to enable crucial innovations and the proliferation of solutions for medical applications such as biomedical sensing and spectroscopy. This talk presents miniaturized microwave and millimeter-wave silicon-germanium circuits and sensor systems for the above mentioned challenges. The present work explains the basic measurement principles and introduces the integrated vector network analyzer as a fundamental component for the design of compact powerful biomedical sensors. Several single-chip sensors as well as hybrid solutions will be presented and discussed. Furthermore, a special ultra-wideband sensor concept for spectroscopy coming with solutions for the injection of electromagnetic waves into biological samples will be demonstrated. Finally, future development trends will be discussed.

Prof. Quandt und Prof. Knöchel

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Sonderkolloquium: Prof. Dr. Thanassis Tiropanis (University of Southampton)/ 25.06.2015

25.06.2015 von 14:15 bis 15:45

Institut für Informatik, Ludewig-Meyn-Str. 2, Übungsraum 2

Titel:  "Web Observatories: Infrastructures for Engaging with Data and Analytics on a Global Scale"

 

Abstract:

 Web Observatories are global distributed resources that can engage communities with data and analytic resources to make the most of existing and emergent datasets including those of the linked data cloud, social media, online archives and media archives. This undertaking is promising in terms of fostering data literacy and innovation on a large scale but comes with infrastructural challenges. Those challenges include resource description and discovery, interoperability, privacy and performance for queries and analytics on a distributed scale. This talk presents how those challenges are addressed in the architecture of the Southampton University Web Observatory and discusses a research roadmap on Web Observatory development.

Prof. Hasselbring

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Kolloquiumsvortrag: Prof. Alexandr Dmitriev, Chalmers University, Göteborg/ 29.06.2015

29.06.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel:

Magnetoplasmonics and active control of light at the bottom-up playground (for nano-, meta-, micro- and beyond)


Abstract:

The combination of magnetism and plasmonics developed into a new burgeoning

field - magnetoplasmonics, where the control of non-reciprocity in light’s interaction with a magnetized media is targeted for various applications. I will discuss the two aspects of magnetoplasmonics: optical polarization-rotator metasurfaces actively tunable with magnetic field; and the label-free optical biochemosensing, where magnetoplasmonics delivers two orders of magnitude higher sensitivity than the current nanoplasmonic sensors.

All discussed magnetoplasmonic platforms are produced on a large (cm2) scale with the affordable and simple bottom-up nanofabrication we develop. I will also highlight our latest ‘any pattern on any surface’ versatile conformal nanofab protocol.

Prof. Faupel

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Kolloquiumsvortrag: Dr. Davide Barater, Department of Information Engineering, University of Parma, Italy/ 06.07.2015

06.07.2015 von 17:15 bis 18:45

Institut für (Ost), Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: “Accelerated Life tests for Electric drives in Aircrafts”

 Abstract:

The concept behind the More Electric Aircraft (MEA) is the progressive electrification of on-board actuators and services. It is a way to reduce or eliminate the dependence on hydraulic, mechanical and the bleed air/pneumatic systems and pursue efficiency, reliability and maintainability. At the moment, the lifetime problems of electromechanical actuators, adopted in MEA, have been addressed by analyzing separately the causes of failures, and accelerated tests were proposed for the single components. This project aims at realizing a test bed able to apply multiple age accelerating stresses and to realize the on-line test of the electric machine and drive, under different operating conditions.

The main failure in electric drives is due to electric faults resulting from the damage in the motor winding insulation system. In this work the main stress factors affecting the lifespan of insulation materials in aerospace applications will be analyzed. A special test bed will be also proposed, to assess insulation lifespan modelling under various stress conditions, especially investigating the interaction between ageing factors. The test bed will allow to characterize insulation degradation under variable ambient and power supply parameters for simple models, such as twisted pairs, up to coil form and complete machine operated at rated load. The proposed approach is based on the design of experiments (DOE). The results of the work that will be carried out will allow to identify the most influential factors affecting insulation lifetime and the interactions between them.

The test setup comprises a Thermal vacuum chamber, an embedded dynamometer/brake system and a custom inverter based on SiC devices capable to apply PWM commutation of different dv/dt ratio.

The test rig would allow an all-in-one approach for multi-parameter measurement, thus minimizing the required test runs.

The test set-up will thus provide a means to confirm, experimentally validate, and also fine-tune insulation degradation lifetime models. In particular a lifetime model, based on the physic Of Failure (PoF) method, that considers the impact of the different stress factors on the system, is expected to be developed during the project.

The ultimate goal is to foster the development and adoption of electric drives for aerospace applications, resulting from more reliable procedures that allow accurate estimation of a system lifetime from the design stage (design reliability work flow) 

Presentation:

Title: “Impact of wide-bandgap devices on the insulation system of magnetics”

In the last few years wide-bandgap power devices, such as SiC and GaN switches, have been started to market. They provide superior performances respect to their Silicon counterparts, reaching faster commutation and maintaining their efficiency even in case of high temperature operation. Nevertheless, their impact on real system has not been completely investigated. The high dv/dt ratio, enabled by the fast commutation transients of SiC or GaN devices, introduces very high frequency harmonics that can trigger partial discharge phenomena in the windings of magnetics present in the circuit, leading to deterioration of the insulation systems.

For this reasons a trade-off between performance and reliability must be reached to enable the widespread utilization of wide-bandgap devices.

Davide Barater was born in Italy on August 13, 1983. He received Master’s degree in Electronic Engineering in 2009 and the Ph.D. degree in Information Technologies in 2014 from the University of Parma, Italy. He was an honorary scholar at the University of Nottingham, U.K, during 2012. He is now working as a postdoctoral research associate at the Department of Information Engineering, University of Parma, Italy. His research area is focused on power electronics for renewable energy systems, static energy conversion and motor drives. He is a reviewer of IEEE transaction on Power Electronics, on Industry application, on Industrial Informatics. He is author or coauthor of more than 20 international papers,  He holds one international patents.

 

Prof. Liserre

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Kolloquiumsvortrag: Dr. Stephan Warnat/ Dalhousie University, Halifax, Canada / 13.07.2015

13.07.2015 von 17:15 bis 18:45

Institut für Materialwissenschaft, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Multi User MEMS environment to test microorganisms in aqueous media

 

Abstract:

 

90 % of international traded products are transported using marine transportation.  Transport and delivery of microorganisms through ballast water from departure to arrival location is an unwanted consequence. Some organisms are invaders or alien species and change the marine ecosystem irreversibly. These irreversible changes cause annual damage in ecosystems, farming and tourism of several million dollars.

 

            I will present our current work on a cell monitoring system using Micro-Electrochemical Systems (MEMS) in a microfluidic camera environment: 1) Devices have to work reliable in seawater. Several MEMS materials show immediate corrosion during operation in seawater. An encapsulation strategy of active structures using Al2O3, TiO2 multilayers deposited by Atomic Layer Deposition (ALD) will be presented which allowed a constant operation in seawater for 30 days; 2) A novel Gecko inspired adhesive technology is currently evaluated to form sealed fluidic chamber systems on top of the MEMS. This technology allows fluidic sealing without bonding processes; 3) The mechanical stiffness of single cells allow an assessment of cell viability. An approach was developed to measure the mechanical cell stiffness based on differential displacement measurements on a two stage spring system. Displacements were measured optically within a ±10 nm accuracy during MEMS operation in aqueous media. This technique allowed differentiation of viable and non-viable Saccharomyces cerevisiae (baker’s yeast). I will conclude the talk with our plans to integrate the developed MEMS platform into a mobile camera platform.

Prof. Wagner

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Kolloquiumsvortrag: PD Dr. Frank Gurski - Universität Düsseldorf/ 17.07.2015

17.07.2015 von 14:15 bis 15:45

Institut für Informatik, Ludewig-Meyn-Str. 2, Übungsraum 2

Titel: Knapsack Problems: A Parameterized point of view

 

Abstract:

 

The knapsack problem is a very famous NP-hard problem in combinatorial optimization. In the 0-1 knapsack problem (0-1 KP) we are given a set A of n items. Every item j has a profit p(j) and a size s(j). Further there is a capacity c of the knapsack. The task is to choose a subset A' of A, such that the total profit of A' is maximized and the total size of A' is at most c.

Within the d-dimensional 0-1 knapsack problem (d-KP) a set A of n items and a number d of dimensions is given. Every item j has a profit p(j) and for dimension i the size s(i,j). Further for every dimension i there is a capacity c(i). The goal is to find a subset A' of A, such that the total profit of A' is maximized and for every dimension i the total size of A' is at most the capacity c(i).

Further we consider the multiple 0-1 knapsack problem (MKP) where beside n items a number m of knapsacks is given. Every item j has a profit p(j) and a size s(j) and each knapsack i has a capacity c(i). The task is to choose m disjoint subsets of A such that the total profit of the selected items is maximized and each subset can be assigned to a different knapsack i without exceeding its capacity c(i) by the sizes of the selected items.

Since d-KP and MKP are defined on inputs of various informations, we study the fixed-parameter tractability of these problems. The idea behind fixed-parameter tractability is to split the complexity into two parts - one part that depends purely on the size of the input, and one part that depends on some parameter of the problem that tends to be small in practice. We discuss the following parameters: the number of items, the threshold value for the profit, the sizes, the profits, the number d of dimensions, and the number m of knapsacks.

We also consider the connection of parameterized knapsack problems to linear programming, approximation, and pseudopolynomial algorithms.

Prof. Jansen

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Sonderkolloquium: Prof. Nicola Femia -University of Salerno / 20.07.2015

20.07.2015 von 10:30 bis 12:00

Institut für Elektrotechnik und Informationstechnik, Kaiser Str. 2, Geb.C , Raum "Aquarium"

Titel: Power Magnetics and Wireless Power


Abstract:

Power magnetics and wireless power are hot topics in modern power management technologies. Power Magnetic devices are in the focus when dealing with high-power-density issues, as power inductors and transformers have a strong influence on the efficiency and size of power converters. Wireless Power is the emerging technology that simplifies battery charging systems and is of great impact in several pervasive applications, such as automotive and portable/wearable devices. The lecture will provide an overview of the most recent research activities of the Power Electronics Research Group of Salerno University about models, mehods, design and optimization topics rearding Power Magnetics and Wireless Power.

Prof. Liserre

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Sonderkolloquium Prof. Manfred Wuttig, University of Maryland, College Park, MD, 17.07.2015

17.07.2015 von 10:00 bis 11:30

Institut für Materialwissenschaft, Kaiserstraße 2, 24143 Kiel, Aquarium

Titel: Unusual Magneto-Elasticity of Fe-(Co), Ga, (Al, Ge, Si) Alloys

 

Abstract:
The magneto-elasticity of  BCC Fe-Ga,Al,Ge solid solutions has been widely discussed during the last decade. In this talk we summarize it and show how the unique linear, reversible and isotropic magnetic characteristics represent the response of a magneto-elastically adaptive state.

 

Prof. Quandt

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Sonderkolloquium Prof. Dr. Oliver G. Schmidt, IFW Dresden, 07.08.2015

07.08.2015 von 14:00 bis 15:30

Insitut für Materialwissenschaft, Kaiserstraße 2, 24143 Kiel, Aquarium

Titel: 3D nanomembrane architectures: From lab-in-a-tube systems to micro-biorobotics

 

Abstract:

Nanomembranes are thin, flexible, transferable and can be shaped into 3D micro- and nanoarchitec-tures. This makes them attractive for a broad range of applications and scientific research fields ranging from novel hybrid heterostructure devices to ultra-compact 3D systems both on and off the chip. If na-nomembranes are differentially strained they deform themselves and roll-up into tubular structures upon release from their mother substrate. Rolled-up nanomembranes can be exploited to rigorously compact electronic circuitry, energy storage units and novel optical systems. They can also serve as ideal plat-form to study single cell behaviour in 2D confined systems.

If appropriate materials are chosen, rolled-up tubes act as tiny catalytic jet engines which in the ultimate limit may drive compact multifunctional autonomous systems for medical and environmental applica-tions. If magnetic tubes are combined with flagella-driven sperm cells, such hybrid micro-biorobots offer new perspectives towards artificial reproduction technologies.

 Key References:
1. Nature 410, 2001, 168-168.
2. Advanced Materials 13, 2001, 756-759.
3. Advanced Materials 20, 2008, 4085-4090.
4. Lab on a Chip 9, 2009, 263-268.
5. Nature Materials 9, 2010, 491-495.
6. Nature Nanotechnology 5, 2010, 458-464.
7. Angewandte Chemie 125, 2013, 2382-2386.
8. ACS nano 7, 2013, 9611-9620.
9. Advanced Functional Materials 25, 2015, 2763-2770.
10. Advanced Materials 27, 2015, 1274-1280

 

 

 

Prof. Adelung

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