@article{HartmannPittnerBonačićKouteckyetal.1998, author = {Hartmann, Michael and Pittner, Jiř{\i}́ and Bonačić-Kouteck{\´y}, Vlasta and Heidenreich, Andreas and Jortner, Joshua}, title = {Theoretical exploration of femtosecond multi-state nuclear dynamics of small clusters}, series = {The Journal of Chemical Physics}, volume = {108}, journal = {The Journal of Chemical Physics}, number = {8}, pages = {3096 -- 3113}, year = {1998}, abstract = {We investigate ultrafast multi-state nuclear dynamics in a triatomic cluster. In particular, we explore how the intracluster nuclear dynamics of the Ag-3/Ag3/Ag+3 system is reflected in the femtosecond pump-probe negative ion-to neutral-to positive ion (NENEPO) signals. The nuclear dynamics is based on classical trajectories on the ground electronic adiabatic state potential hypersurfaces obtained from accurate ab initio quantum chemistry calculations. The nuclear dynamics of Ag3 initiated from the linear transition state involves distinct sequential processes of configurational relaxation to the triangular configuration, intracluster collisions, and the onset of IVR, resonant, and dissipative IVR, and vibrational equilibration. We determined the timescales for these processes and discussed their dependence on the initial cluster temperature. The Wigner representation of the density matrix was utilized to simulate the NENEPO-zero kinetic energy (NENEPO-ZEKE) signal and the total (integrated over the photoelectron energy) NENEPO signal. We show how geometrical change, completion of IVR and vibrational coherenceeffects can be identified in the NENEPO signals. A comparison of the calculated NENEPO signals with the available experimental data is presented.}, language = {en} } @inproceedings{SchreiberHartmann1998, author = {Schreiber, Michael and Hartmann, Michael}, title = {Numerical Study of the Photoexcitation of Solitons in Conjugated Polymers}, series = {3rd International conference on excitonic processes in condensed matter (EXCON '98)}, booktitle = {3rd International conference on excitonic processes in condensed matter (EXCON '98)}, year = {1998}, abstract = {Keine Angabe - No details}, language = {en} } @article{BonačićKouteckyPittnerPouAmerigoetal.1997, author = {Bonačić-Kouteck{\´y}, Vlasta and Pittner, Jiř{\i}́ and Pou-Am{\´e}rigo, Rosendo and Hartmann, Michael}, title = {Ab-initio study of structural and optical properties of nonstoichiometric alkalimetal- oxides}, series = {Zeitschrift f{\"u}r Physik D}, volume = {40}, journal = {Zeitschrift f{\"u}r Physik D}, number = {1}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5748}, pages = {445 -- 447}, year = {1997}, abstract = {Structural and optical properties of nonstoichiometric LinO and NanO (n = 3, 4) clusters containing one and two excess electrons are studied using ab-initio methods accounting for electron correlation. We show that calculated absorption patterns are excellent fingerprints of structural and bonding properties. The optical response of Li4O and Na4O clusters with the most stable tetrahedral type structures is characterized by a common feature, that is the appearance of a dominant intense transition in infrared regime although excess of electrons are not localized, as it is the case for small alkali-halide clusters, with cuboid corner vacancy (surface F-center in finite systems).}, language = {en} } @article{RoeselerHartmann1997, author = {R{\"o}seler, J. and Hartmann, Michael}, title = {An exactly solvable model for the large polaron}, series = {Zeitschrift f{\"u}r Physik B}, volume = {102}, journal = {Zeitschrift f{\"u}r Physik B}, number = {4}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5782}, pages = {531 -- 540}, year = {1997}, abstract = {We present an exactly diagonalizable model Hamiltonian for the large polaron derived by analyzing the variational ansatz by Haga-Larsen (HL) for the Fr{\"o}hlich Hamiltonian. The lowest energy eigenvalue of the model Hamiltonian for fixed wave numbers reproduces the energy of the variational ansatz by Haga-Larsen and is, therefore, an upper bound with respect to the corresponding energy eigenvalue of the Fr{\"o}hlich Hamiltonian. This is valid for any momentum which is proven by extending the Haga-Larsen approach. Furthermore, since all integrations can be performed analytically, the model Hamiltonian is easily tractable. The energy eigenvalue spectrum of the model Hamiltonian is studied below and above the phonon-emission threshold. The quality of the model Hamiltonian is determined by the variational ansatz of Haga and Larsen. Incorporating an improved energy-momentum relation, a generalized model Hamiltonian is derived possessing a larger validity range with respect to the coupling strength. Furthermore, a second exactly diagonalizable model Hamiltonian based on improved Wigner-Brillouin perturbation theory due to Warmenbol, Peeters, and Devreese (WPD) is presented. It is briefly demonstrated that one is able to construct all mentioned model Hamiltonians also in the 2D polaron problem. In contrast to the 3D case, where the HL-type model Hamiltonian possesses the higher quality for any momentum, in the 2D case, it works well only for small momenta. For large momenta, only the WPD-type model Hamiltonian describes the energy-momentum relation correctly. We demonstrate the usefulness of the model Hamiltonian concept by exactly calculating the one-electron Green's function for all mentioned model Hamiltonians and comment why significant advantages of the model Hamilton concept for the treating of low-dimensional systems (planar semiconducting quantum-well structures) can be expected.}, language = {en} } @article{HartmannSchreiberStreitwolfetal.1995, author = {Hartmann, Michael and Schreiber, Michael and Streitwolf, H.-W. and Mukamel, Shaul}, title = {Nonlinear optical excitations in femtosecond spectroscopy of conjugated polymers}, series = {Journal of Luminescence}, volume = {66-67}, journal = {Journal of Luminescence}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5795}, pages = {97 -- 101}, year = {1995}, abstract = {We have investigated the optical excitation of solitons and charge transfer excitons in polymer chains by solving the equations of motion for the reduced density matrix and the lattice displacement simultaneously in time. Electron-phonon coupling leads to polaron-exciton formation which can be identified in transient pump-probe signals.}, language = {en} } @inproceedings{HartmannTakahashiMukameletal.1995, author = {Hartmann, Michael and Takahashi, Akira and Mukamel, Shaul and Schreiber, Michael}, title = {Soliton and exciton effects in femtosecond spectroscopy of conjugated polymers}, series = {International Conference on Excitonic Processes in Condensed Matter}, booktitle = {International Conference on Excitonic Processes in Condensed Matter}, year = {1995}, abstract = {We introduce a concept which allows to study the nonlinear optical response of conjugated polymers taking into account many-body effects of the excitation process. The formation of charge transfer excitons and the creation of lattice distortions are studied in short polymer chains by solving the self consistent equations of motion for the reduced single electron density matrix and the lattice displacement. The coupling of electronic motions to lattice dynamics gives rise to the formation of excitonic polarons, which can be identified in the femtosecond pump-probe signal.}, language = {en} } @article{HartmannChernyakMukamel1995, author = {Hartmann, Michael and Chernyak, Vladimir Y. and Mukamel, Shaul}, title = {Real-space coupled-oscillator approach to the radiative decay of conjugated polymers}, series = {Physical Review B}, volume = {52}, journal = {Physical Review B}, number = {4}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5813}, pages = {Keine Angabe - No details -- Keine Angabe - No details}, year = {1995}, abstract = {The optical response of conjugated polymers is calculated using a one-dimensional tight-binding model with Coulomb interactions, and adopting the multipolar form for the electromagnetic field Hamiltonian. By formulating the problem using the reduced single-electron density matrix and its evolution in Liouville space, we obtain a real-space description for the elementary electronic excitations. A unified expression for the linear response including radiative decay, which is valid for arbitrary chain size compared with the optical wavelength, is described. For small sizes it shows exciton confinement effects on the radiative decay and for larger sizes it fully incorporates polariton effects.}, language = {en} } @inproceedings{SantosSuiskyEndersetal.1994, author = {Santos, C. and Suisky, D. and Enders, P. and Neugebauer, F. and Hartmann, Michael and R{\"o}seler, J. and Knoch, R. and Heimbrodt, Wolfram}, title = {Magnetooptical Anisotropy in Semimagnetic Materials: the Interplay of Strain and Magnetic Field}, series = {European Workshop on II-VI Semiconductors, Linz}, booktitle = {European Workshop on II-VI Semiconductors, Linz}, year = {1994}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{SantosSuiskyNeugebaueretal.1994, author = {Santos, C. and Suisky, D. and Neugebauer, F. and Hartmann, Michael and Heimbrodt, Wolfram and R{\"o}seler, J.}, title = {Magnetooptical Anisotropy in Superlattices and Quantum Wells}, series = {22nd International Conference on the Physics of Semiconductors, Vancouver}, booktitle = {22nd International Conference on the Physics of Semiconductors, Vancouver}, year = {1994}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{DeMoreBraunerGockel2014, author = {DeMore, Jaime and Brauner, Elisabeth and Gockel, Christine}, title = {Counteracting detrimental effects of cognitive loafing on transactive memory}, series = {85th Meeting of the Eastern Psychological Association, Boston}, booktitle = {85th Meeting of the Eastern Psychological Association, Boston}, year = {2014}, abstract = {In a first study, we explored whether cognitive loafing (reduced cognitive effort) can disrupt knowledge exchange in transactive memory systems and administered a cognitive loafing measure to investigate its effects. In our second study, we explored if affective commitment and perceived team performance could counteract the detrimental effects of cognitive loafing. Results show that both affective commitment and perceived team performance moderated the relationship between observed cognitive loafing and transactive memory.}, language = {en} } @inproceedings{BraunerDeMoreGockel2013, author = {Brauner, Elisabeth and DeMore, Jaime and Gockel, Christine}, title = {Counterproductive behaviors in teams: detrimental effects of cognitive loafing on transactive memory}, series = {84th Meeting of the Eastern Psychological Association, New York}, booktitle = {84th Meeting of the Eastern Psychological Association, New York}, year = {2013}, abstract = {Cognitive interdependence in teams requires members to contribute their share to a common task. Cognitive loafing(reduced cognitive effort) can disrupt knowledge exchange in transactive memory systems. We administered a cognitive loafing measure to investigate its effects. Results show that cognitive loafing has significant negative impact on transactive memory, whereas affective commitment has a positive impact on transactive memory. Furthermore, we found that cognitive loafing within a team was not contagious among team members.}, language = {en} } @article{Hartmann2002, author = {Hartmann, Michael}, title = {Non equilibrium Green's function approach to nonadiabetic molecular dynamics}, series = {Journal of Physical Chemistry A}, volume = {106}, journal = {Journal of Physical Chemistry A}, pages = {Keine Angabe - No details -- Keine Angabe - No details}, year = {2002}, abstract = {Keine Angabe - No details}, language = {en} } @article{MitrićHartmannStancaetal.2001, author = {Mitrić, Roland and Hartmann, Michael and Stanca, B. and Bonačić-Kouteck{\´y}, Vlasta and Fantucci, P.}, title = {Ab Initio Adiabatic Dynamics Combined with Wigner Distribution Approach to Femtosecond Pump-Probe Negative Ion to Neutral to Positive Ion (NeNePo) Spectroscopy of Ag2Au, Ag4, and Au4 Clusters}, series = {Journal of Physical Chemistry A}, volume = {105}, journal = {Journal of Physical Chemistry A}, number = {39}, pages = {8892 -- 8905}, year = {2001}, abstract = {Ultrafast ground state nuclear dynamics of small coinage metal clusters is theoretically explored in the framework of negative ion to neutral to positive ion (NeNePo) femtosecond pump-probe spectroscopy with the aim to determine the scope and perspective of this technique. This approach involves the preparation of an initial ensemble in the anionic ground state of the cluster, one-photon detachment by the pump pulse, the propagation of the system on the neutral electronic ground state, and detection via the cationic ground state by a time-delayed ionizing probe pulse. The calculations of the NeNePo-ZEKE signals under the condition of zero kinetic energy electrons are based on the combination of the Wigner distribution approach and ab initio molecular dynamics (MD) "on the fly" in the framework of gradient-corrected DFT for the propagation of an ensemble of classical trajectories and involves the average over the entire phase space. We have chosen examples of Ag2Au and Au4 to investigate time scales and the character of isomerization processes that are influenced by a local minimum corresponding to an energetically high-lying isomer with the structure related to the initial anionic structure. Capture of the nuclei within the local minimum takes place with dephased (Ag2Au) or nondephased (Au4) vibrational relaxation. Structural relaxations leading to isomerization processes are in both cases of delocalized nature and take place after 1 ps. In contrast, the Ag4 cluster represents an example for which isomerization processes do not occur, since rhombic structures with slightly different bond lengths are global minima of the anionic and neutral ground states. Therefore, the relaxation dynamics is characterized by regular oscillations, which serve as fingerprints of structural properties. On the basis of the analysis of pump-probe signals and underlying dynamics, this contribution provides information about conditions under which structural properties of gas-phase clusters (global and local minima) and isomerization processes can be observed in the framework of the NeNePo-ZEKE type of spectroscopy. The latter is important in the context of applicability of this technique to the investigation of cluster reactivity.}, language = {en} } @article{BonačićKouteckyHartmannPittner2001, author = {Bonačić-Kouteck{\´y}, Vlasta and Hartmann, Michael and Pittner, Jiř{\i}́}, title = {Theoretical exploration of ultrafast spectroscopy of small clusters}, series = {The European Physical Journal D}, volume = {16}, journal = {The European Physical Journal D}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5536}, pages = {133 -- 138}, year = {2001}, abstract = {We present the ultrafast multistate nuclear dynamics involving adiabatic and nonadiabatic excited states of non-stoichiometric halide deficient clusters (NanF) characterized by strong ionic bonding and one-excess electron for which the "frozen ionic bonds" approximation has been justified allowing to consider the optical response of the single excess electron in the effective field of the other electrons. We combined the Wigner-Moyal representation of the vibronic density matrix with the ab initio multi state molecular dynamics in the ground and excited electronic states including the nonadiabatic couplings calculated "on the fly" at low computational demand. This method allows the simulation of femtosecond pump-probe and pump-dump signals based on an analytical formulation, which utilizes temperature dependent ground state initial conditions, an ensemble of trajectories carried out on the electronic excited state as well as on the ground state after the passage through the conical intersection in the case of nonadiabatic dynamics and for probing either in the cationic state or in the ground state. The choice of the systems we presented has been made in order to determine the timescales of the fast geometric relaxation leaving the bonding frame intact as during the dynamics in the first excited state of Na4F3, and of the bond breaking processes leading to conical intersection between the first excited state and the ground state as in Na3F2. The former is the smallest finite system prototype for an surface F-center of bulk color centers. The latter allows to study the photo isomerization in full complexity taking into account all degrees of freedom. In the case of Na4F3 after the fast geometric relaxation in the excited state leading to deformed cuboidal structure without breaking of bonds, different types of internal vibrational redistribution (IVR) processes have been identified in pump-dump signals by tuning the dump laser. In contrast, from the analysis of the pump-probe signals of Na3F2 cluster, the timescales for the metallic and the ionic bond breaking, as well as for the passage through conical intersection have been determined. Finally the conditions under which these processes can be experimentally observed have been identified.}, language = {en} } @article{HartmannMitrićStancaetal.2001, author = {Hartmann, Michael and Mitrić, Roland and Stanca, B. and Bonačić-Kouteck{\´y}, Vlasta}, title = {Theoretical investigation of the ultrafast NeNePo spectroscopy of Au4 and Ag4 Clusters}, series = {The European Physical Journal D}, volume = {16}, journal = {The European Physical Journal D}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5542}, pages = {151 -- 155}, year = {2001}, abstract = {Ultrafast ground state nuclear dynamics of Au4 and Ag4 is theoretically explored in the framework of negative ion - to neutral - to positive ion (NeNePo) pump-probe spectroscopy based on the ab initio Wigner distribution approach. This involves the preparation of a nonequilibrium neutral ensemble by pump induced photodetachment of a thermal anionic ground state distribution, gradient corrected DFT classical trajectory simulations "on the fly" on the neutral ground state, and detection of the relaxation process of the ensemble in the cationic ground state by a time-delayed probe pulse. In Au4, the initially prepared linear structure is close to a local minimum of the neutral state giving rise to characteristic vibrations in the signals for probe wavelength near the initial Franck-Condon transition. A timescale of ~1 ps for the structural relaxation towards the stable rhombic D neutral isomer was determined by the increase of the signal for probe wavelength in vicinity of the vertical ionization energy of the rhombic structure. In contrast, the relaxation dynamics in Ag4 is characterized by normal mode vibrations since both the initially prepared anionic ground state and the neutral ground state have rhombic minimum geometries. Thus, time-resolved oscillations of pump-probe signals are fingerprints of structural behaviour which can be used experimentally for the identification of particular isomers in the framework of NeNePo spectroscopy.}, language = {en} } @article{HartmannPittnerBonačićKoutecky2001, author = {Hartmann, Michael and Pittner, Jiř{\i}́ and Bonačić-Kouteck{\´y}, Vlasta}, title = {Ab initio nonadiabatic dynamics involving conical intersection combined with Wigner distribution approach to ultrafast spectroscopy illustrated on Na3F2 cluster}, series = {The Journal of Chemical Physics}, volume = {114}, journal = {The Journal of Chemical Physics}, number = {5}, pages = {2123 -- 2136}, year = {2001}, abstract = {We present a theoretical study of a femtosecond photo isomerization process due to a nonadiabatic radiationless decay from the first excited state through a conical intersection occurring in one of the nonstoichiometric halide-deficient clusters with one excess electron (Na3F2). This is an extension of the adiabatic dynamics study presented in the accompanying paper [J. Chem. Phys. 114, 2106 (2001)] for other members of the NanFn-1 series characterized by a strong ionic bonding for which the "frozen ionic bonds" approximation has been justified, allowing consideration of the optical response of the single excess electron in the effective field of the other electrons. In this contribution we outline the extension of the ab initio Wigner-distribution approach to nonadiabatic molecular dynamics which combines the Wigner-Moyal representation of the vibronic density matrix with the ab initio multistate molecular dynamics in the ground- and excited electronic states including the nonadiabatic coupling computed "on the fly" in connection with the fewest-switches hopping algorithm. This scheme allows accounting for temperature-dependent initial conditions, for the propagation in the excited state and in the ground state after the passage through the conical intersection, and for probing in the cationic ground state as well as for deriving analytic expressions for the pump-probe signals which utilize an ensemble of classical trajectories obtained at low computational demand. Our approach permits investigation of the photo isomerization through the conical intersection due to the long amplitude motion in the Na3F2 system in full complexity, taking into account all degrees of freedom. After breaking of one metallic and of one ionic bond the conical intersection occurs at the linear geometry and involves states of different symmetry which differ in the translocation of the one excess electron or positive charge localized at the Na atom from one end to the other of the system and separates two isomers with Cs and C2v structures. From the analysis of the nonadiabaticdynamics, the time scales for the metallic bond breaking of ∼90 fs and for the ionic bond breaking of ∼220 fs, for the passage through the conical intersection after ∼0.4 ps and for the internal vibrational energy redistribution (IVR) of more than 0.9 ps for the individual isomers, have been determined. The simulated fs pump-probe signals confirm the above results and provide the information about the experimental conditions such as laser frequencies and pulse duration under which bond breaking of different type as well as the population of each of the two isomers after the passage through the conical intersection can be identified. In this contribution we show that the mechanism of the photo isomerization at a conical intersection due to a long amplitude motion can occur in atomic clusters and is not necessarily limited to organic photochemistry.}, language = {en} } @article{HartmannPittnerBonačićKoutecky2001, author = {Hartmann, Michael and Pittner, Jiř{\i}́ and Bonačić-Kouteck{\´y}, Vlasta}, title = {Ab initio adiabatic dynamics involving excited states combined with Wigner distribution approach to ultrafast spectroscopy illustrated on alkali halide clusters}, series = {The Journal of Chemical Physics}, volume = {114}, journal = {The Journal of Chemical Physics}, number = {5}, pages = {2106 -- 2122}, year = {2001}, abstract = {We investigate the ultrafast multistate nuclear dynamics involving adiabatic electronic excited states of nonstoichiometric halide deficient clusters (NanFn-1) characterized by strong ionic bonding and one excess electron, which is localized either in the halide vacancy or on the alkali atom attached to the ionic subunit depending on the cluster size. For this purpose we developed an ab initio adiabatic nuclear dynamics approach in electronic excited and ground states "on the fly" at low computational demand by introducing the "frozen ionic bonds" approximation, which yields an accurate description of excited states considering the excitation of the one excess electron in the effective field of the other n-1 valence electrons involved in the ionic bonding. We combined this multistate dynamics approach with the Wigner-Moyal representation of the vibronic density matrix forming the ab initio Wigner distribution approach to adiabatic dynamics. This method allows the simulation of femtosecondNeExPo-pump-probe and NeExNe-pump-dump signals based on an analytic formulation which utilizes temperature-dependent ground-state initial conditions (Ne), an ensemble of trajectories carried out on the electronic excited state (Ex) for the investigation of the dynamics of the system, and either the cationic (Po) or the ground state (Ne) for the probing step. The choice of the systems has been made in order to determine the time scales of processes involving (i) metallic bond breaking such as during the dynamics in the first excited state of Na2F, and (ii) fast geometric relaxation leaving the bonding frame intact as during the dynamics in the first excited state of Na4F3. The bond-breaking process via a conical intersection involving nonadiabatic dynamics will be presented in the accompanying paper [Hartmann et al., J. Chem. Phys. 114, 2123 (2001)]. The dynamics in the first excited state of Na2F from triangular-to linear-to triangular structure gives rise to fast geometric relaxation due to Na-Na bond breaking at the time scale of ∼90 fs but no signature of internal vibrational energy redistribution (IVR) is present in NeExNe-pump-dump signals since the broken metallic bond prevents the coupling between stretching and bending modes. Instead, anharmonicities of the bending periodic motion have been identified. In contrast, in the case of Na4F3, which is the smallest finite system for a surface F-center prototype of bulk color centers, after the geometric relaxation in the excited state of ∼100 fs leading to the deformed cuboidal type of structure without breaking of bonds, different types of IVR have been identified in NeExNe signals by tuning the dump laser: one-mode selective energy leaving IVR, resonant, and restricted energy arriving IVR corresponding to the selection of different parts of the phase space. Dissipative IVR could not be identified in NeExNe signals of Na4F3 at low initial temperature on the time scale up to 2 ps in spite of 15 degrees of freedom. Due to similar structural and electronic properties such as F centers in bulk, these findings can serve as guidance for establishing the time scales for geometric relaxation and IVR in excited states of larger systems.}, language = {en} } @inproceedings{GocekHartmannSchleuseneretal.2006, author = {Gocek, Pawel and Hartmann, Michael and Schleusener, Heinz and Timč{\´a}k, Geza}, title = {Webportal using Web 2.0 Technology for the Špis Region}, series = {5th International Conference on Perspectives of rural tourism in the New Europe, Košice}, booktitle = {5th International Conference on Perspectives of rural tourism in the New Europe, Košice}, pages = {48 -- 54}, year = {2006}, abstract = {Portals are called web sites which are designed to offer services and/or an outline of special subjects. They have been developed as fast as information data bases and electronic communication facilities were extended. Recently, portals with geographically referenced information became important and popular for different fields like geo information systems of cities (see e. or the presentation of economically relevant data in the context of regional marketing, foreign direct investment or tourism by indicating important objects like public institutions, companies, hotels, sights, etc. on maps. In this manner they may contribute to the improvement of industrial structure and the marketing of a region. For representing geographical data on maps, applications with special client-server-architecture have to be developed. There are different solutions for the Internet using HTML and JavaScript, Flash or Java Applets. In our contribution we discuss currently available solutions and show an alternative approach. Our solution is based on the Java Applet technology and Asynchronous JavaScript and XML (Ajax). This technology is part of the web solutions known as Web 2.0 which is strongly discussed and developed in the present. Our results are demonstrated as a user-friendly web application with data of the Slovakian region Špis (Zips). An extended version of this web solution could be nicely incorporated into a modern concept for tourism of the Špis region.}, language = {en} } @inproceedings{KohlerHartmannSchleuseneretal.2006, author = {Kohler, L. and Hartmann, Michael and Schleusener, Heinz and Timč{\´a}k, Geza}, title = {Web 2-presentation of regional data}, series = {5th International Conference on Perspectives of rural tourism in the New Europe, Košice}, booktitle = {5th International Conference on Perspectives of rural tourism in the New Europe, Košice}, pages = {55 -- 58}, year = {2006}, abstract = {Web portals and many Internet solutions contain objects with a geographical reference such as the position of a company or a tourist attraction. Existing maps are protected by copyright. The licence fee is high and it is very expensive and complicated to create own maps. Freely useable and suitable maps for presentations, such as open source, do not exist - although the project OpenGeoDB is growing day after day. Recently, however some changes occurred. After a registration, Yahoo and Google offer interfaces to their map data for non-commercial users. This can be used for free. The interfaces offer advanced user possibilities for accessing maps, which are mostly high resolution ones, using the Web 2 methods. We show how to integrate Google´s API interface into one's own web applications and finally, how regional data, stored in a database, can be presented by this solution. Currently, Google does not have sufficiently detailed maps for Eastern Europe yet. Nevertheless, our web solution uses data of the region Zips (Špis) in Slovakia. It demonstrates how geo-based data can be used for supporting regional marketing concepts by Web 2 in the future.}, language = {en} } @inproceedings{HartmannLieberumPlewkaetal.2005, author = {Hartmann, Michael and Lieberum, Uta and Plewka, Tomas and Sauer, Petra and Schweikart, Joachim and Yossa Nou b ikou, Jean-Jacques and Schleusener, Heinz}, title = {Development of Geo-Based interactive Web Portals for Joint Ventures-Problems and Challenges}, series = {Informatika a felsőoktat{\´a}sban, Debrecen}, booktitle = {Informatika a felsőoktat{\´a}sban, Debrecen}, year = {2005}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{DeMoreBraunerGockel2014, author = {DeMore, Jaime and Brauner, Elisabeth and Gockel, Christine}, title = {Can team productivity be improved by counteracting detrimental effects of cognitive loafing on transactive memory?}, series = {75th Annual Convention of the Canadian Psychological Association, Vancouver}, booktitle = {75th Annual Convention of the Canadian Psychological Association, Vancouver}, year = {2014}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{GockelWerth2009, author = {Gockel, Christine and Werth, Lioba}, title = {Are funny groups more creative?: humor, cohesion, and creativity in small groups}, series = {4th Annual INGRoup Conference, Colorado Springs}, booktitle = {4th Annual INGRoup Conference, Colorado Springs}, year = {2009}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{Gockel2007, author = {Gockel, Christine}, title = {Effects of put-down humor on cohesion in groups}, series = {2nd Annual INGRoup Conference, East Lansing}, booktitle = {2nd Annual INGRoup Conference, East Lansing}, year = {2007}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelWittenbaum2007, author = {Gockel, Christine and Wittenbaum, Gwen M.}, title = {Influence in dyadic decision-making: arguing for what one believes or does not believe}, series = {2nd Annual INGRoup Conference, East Lansing}, booktitle = {2nd Annual INGRoup Conference, East Lansing}, year = {2007}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelWittenbaumHollingsheadetal.2006, author = {Gockel, Christine and Wittenbaum, Gwen M. and Hollingshead, A. B. and Raile, A.}, title = {Disentangling two explanations for biased information exchange in mixed-motive decision-making groups}, series = {1st Annual INGRoup Conference, Pittsburgh}, booktitle = {1st Annual INGRoup Conference, Pittsburgh}, year = {2006}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelKerrQureshietal.2006, author = {Gockel, Christine and Kerr, Norbert L. and Qureshi, A. and Park, Ernest S.}, title = {Message uniformity as a moderator of majority/minority influence}, series = {78th Annual Meeting of the Midwestern Psychological Association, Chicago}, booktitle = {78th Annual Meeting of the Midwestern Psychological Association, Chicago}, year = {2006}, abstract = {Keine Angabe No details}, language = {en} } @article{GocekHartmannSchleusener2006, author = {Gocek, Pawel and Hartmann, Michael and Schleusener, Heinz}, title = {Modern Technologies in Client-Server Architecture for Geo-based Interactive Web Portals}, series = {Journal of Universal Computer Science}, volume = {12}, journal = {Journal of Universal Computer Science}, number = {9}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5335}, pages = {1208 -- 1214}, year = {2006}, abstract = {The internet is an unlimited growing and most comfortable information and communication base. In this context, web portals on the internet play an important role created for combining communication facilities and information data bases. An increasing number of portals involve web-based map applications to integrate geographic information for the representation of economical and other records. Web-based map applications are typically designed in a client-server architecture. Different solutions exist using especially HTML and JavaScript, Flash or Java applets. We discuss these possibilities and point out an alternative solution. Particularly, we show how to use Java Applet Technology and Asynchronous JavaScript and XML (Ajax) in this field. Finally, we report about our results as a complete, flexible map service solution which is available on the internet. An adapted kind of solution will be used by a geo-based marketing portal for offering information about the economic situation, social and cultural aspects and natural facts of regions to support joint-ventures inside the European Union.}, language = {en} } @inproceedings{GocekHartmannSchleusener2006, author = {Gocek, Pawel and Hartmann, Michael and Schleusener, Heinz}, title = {Modern Technologies in client-server Architecture for Geo-Based Webportals: represented by examples for Companies in Food Technology and Food Industry}, series = {Proceedings of the 7th International Conference on Food Science, Szeged}, booktitle = {Proceedings of the 7th International Conference on Food Science, Szeged}, year = {2006}, abstract = {In the last decade, portals on the WWW have been extensively developed for different applications in e-business, e-commerce, e-government or science and are used as an information and communication base. Recently, due to the progression of web- technologies, new user-friendly features could be added into portals. Among them the incorporation of geographic informations became most important since many relevant data are related to space. In such a way the value and the appropriate visualization of the relevant information as well as the ability to investigate the interrelation between different data could be reached (Bernhardt, 02). Geo-based web portals combine the features of common portals like searching for keywords or navigating with geo information systems (GIS). For a certain target group they provide a unique presentation of all relevant information within a region or a market, and provide user specific communication tools. In this context, providing maps is one of the main characteristics of geo-based web portals. Creating a geo-referenced map is a challenging and complex task since all relevant geo data like streets, objects, information of the landscape etc. have to be known and incorporated into the GIS. Therefore, a geo-object in the geo-based web portal has to contain both the geo-data and the content related data. Geo-data describe the structure of an object in space whereas the content related data provide additional attributes associated with the properties of the object (Dickmann \& Zehner 2001). From the point of the architecture, a web-based map application consists of two essential components - the server and the client part. Typically, the server component is responsible for providing geographical information according to the client's request and returns the data and images suitable for the visualization back to the client application. The client component provides the user with a graphical user interface (GUI). Its main tasks are collecting the user input data and communicating with the server in order to retrieve the information as well as to provide interactive mechanisms for representing analyzing the results. The communication between the client and the sever component via a HTTP port is based on a defined request-response protocol. Typical solutions are implemented using JavaScript, Java applets or Flash and are discussed in more detail in the next section. In this contribution we describe an alternative approach using the Java Applet Technology, Asynchronous JavaScript and XML (Ajax). It's application for offering informations of companies operating in the field of food technology and food industry is shown. In such a way it represents a realization of our recently developed concept of a geo-based web portal (Hartmann et al, 05).}, language = {en} } @inproceedings{GockelWittenbaum2006, author = {Gockel, Christine and Wittenbaum, G. M.}, title = {Information sharing in competitive decision-making groups: biased cognition or strategic communication?}, series = {7th Annual Meeting of the Society for Personality and Social Psychology, Palm Springs}, booktitle = {7th Annual Meeting of the Society for Personality and Social Psychology, Palm Springs}, year = {2006}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelBrauner2005, author = {Gockel, Christine and Brauner, Elisabeth}, title = {Development of a transactive memory in small groups}, series = {77th Annual Meeting of the Midwestern Psychological Association, Chicago}, booktitle = {77th Annual Meeting of the Midwestern Psychological Association, Chicago}, year = {2005}, abstract = {In a lab study, the effects of metacognition and perspective taking on the development of a transactive memory were examined. Discussions of 20 groups were coded with a specifically developed coding scheme. Perspective taking showed the expected positive effect, but metacognition did not. The features of the metacognition training might explain this.}, language = {en} } @inproceedings{GockelWittenbaum2005, author = {Gockel, Christine and Wittenbaum, Gwen M.}, title = {Information sharing in decision-making dyads: strategic communication or motivated cognition?}, series = {10th Meeting of the Social Psychology Division (Fachgruppe Sozialpsychologie), Jena}, booktitle = {10th Meeting of the Social Psychology Division (Fachgruppe Sozialpsychologie), Jena}, year = {2005}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelBrauner2006, author = {Gockel, Christine and Brauner, Elisabeth}, title = {Individual and social metacognition}, series = {7th Annual Meeting of the Society for Personality and Social Psychology, Palm Springs}, booktitle = {7th Annual Meeting of the Society for Personality and Social Psychology, Palm Springs}, year = {2006}, abstract = {Keine Angaben No details}, language = {en} } @inproceedings{GockelMeyer2011, author = {Gockel, Christine and Meyer, Bertolt}, title = {Change in teams}, series = {15th Conference of the European Association of Work and Organizational Psychology, Maastricht}, booktitle = {15th Conference of the European Association of Work and Organizational Psychology, Maastricht}, year = {2011}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{GockelWerthSteidle2011, author = {Gockel, Christine and Werth, Lioba and Steidle, Anna}, title = {Is the journey as important as the destination?: power increases affective transfer from goals to corresponding activities}, series = {13. Tagung der Fachgruppe Sozialpsychologie, Hamburg}, booktitle = {13. Tagung der Fachgruppe Sozialpsychologie, Hamburg}, year = {2011}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{GockelKolbWerth2011, author = {Gockel, Christine and Kolb, Peter and Werth, Lioba}, title = {Room temperature affects customer orientation in service encounters}, series = {7th Meeting of the Work, Organizational and Business Psychology Division, Rostock}, booktitle = {7th Meeting of the Work, Organizational and Business Psychology Division, Rostock}, year = {2011}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{GockelBrauner2010, author = {Gockel, Christine and Brauner, Elisabeth}, title = {Perspective-taking helps transactive memory development}, series = {5th Annual INGRoup Conference, Washington}, booktitle = {5th Annual INGRoup Conference, Washington}, year = {2010}, abstract = {Keine Angabe - No details}, language = {en} } @article{GockelKolbWerth2014, author = {Gockel, Christine and Kolb, Peter M. and Werth, Lioba}, title = {Murder or not?: cold temperature makes criminals appear to be cold-blooded and warm temperature to be hot-headed}, series = {PLoS ONE}, volume = {9}, journal = {PLoS ONE}, number = {4}, pages = {Keine Angabe - No details -- Keine Angabe - No details}, year = {2014}, abstract = {Temperature-related words such as cold-blooded and hot-headed can be used to describe criminal behavior. Words associated with coldness describe premeditated behavior and words associated with heat describe impulsive behavior. Building on recent research about the close interplay between physical and interpersonal coldness and warmth, we examined in a lab experiment how ambient temperature within a comfort zone influences judgments of criminals. Participants in rooms with low temperature regarded criminals to be more cold-blooded than participants in rooms with high temperature. Specifically, they were more likely to attribute premeditated crimes, ascribed crimes resulting in higher degrees of penalty, and attributed more murders to criminals. Likewise, participants in rooms with high temperature regarded criminals to be more hot-headed than participants in rooms with low temperature: They were more likely to attribute impulsive crimes. Results imply that cognitive representations of temperature are closely related to representations of criminal behavior and attributions of intent.}, language = {en} } @inproceedings{GockelBrauner2002, author = {Gockel, Christine and Brauner, Elisabeth}, title = {Development of a transactive memory: the influence of metacognition and perspective taking}, series = {43rd Congress of the German Psychological Society (DGPs), Berlin}, booktitle = {43rd Congress of the German Psychological Society (DGPs), Berlin}, year = {2002}, abstract = {Keine Angabe - No details}, language = {en} } @inproceedings{GockelKaiserDyrenforthetal.2005, author = {Gockel, Christine and Kaiser, Cheryl R. and Dyrenforth, P. S. and Poulsen, J. R.}, title = {The belief in a just world moderates affective and interpersonal reactions towards discrimination claimants}, series = {6th Annual Meeting of the Society for Personality and Social Psychology, New Orleans}, booktitle = {6th Annual Meeting of the Society for Personality and Social Psychology, New Orleans}, year = {2005}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelMesse2005, author = {Gockel, Christine and Mess{\´e}, L. A.}, title = {Boundaries of minority influence}, series = {6th Annual Meeting of the Society for Personality and Social Psychology, New Orleans}, booktitle = {6th Annual Meeting of the Society for Personality and Social Psychology, New Orleans}, year = {2005}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GockelKerr2005, author = {Gockel, Christine and Kerr, Norbert L.}, title = {Effects of different inadmissibility rulings}, series = {77th Annual Meeting of the Midwestern Psychological Association, Chicago}, booktitle = {77th Annual Meeting of the Midwestern Psychological Association, Chicago}, year = {2005}, abstract = {Keine Angabe No details}, language = {en} } @misc{Stantchev2014, author = {Stantchev, Vladimir}, title = {Addressing Sustainability in IT-Governance Frameworks}, year = {2014}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GlasbergFeldnerSchidlack2009, author = {Glasberg, Ronald and Feldner, Nadja and Schidlack, Michael}, title = {Heimvernetzung: Studie zum vierten nationalen IT-Gipfel 2009 der Bundesregierung}, year = {2009}, abstract = {Keine Angabe No details}, language = {de} } @inproceedings{GlasbergFeldner2009, author = {Glasberg, Ronald and Feldner, Nadja}, title = {Moderne audio-visuelle Datenformate: Kundenerwartungen, {\"U}bertragungswege und technische Standards}, year = {2009}, abstract = {Keine Angabe No details}, language = {de} } @inproceedings{GlasbergFeldner2009, author = {Glasberg, Ronald and Feldner, Nadja}, title = {Heimvernetzung: Konsumentennutzen und Komfort: Studie zum dritten nationalen IT-Gipfel 2008 der Bundesregierung}, year = {2009}, abstract = {Keine Angabe No details}, language = {de} } @inproceedings{Glasberg2009, author = {Glasberg, Ronald}, title = {HD-TV: technologische Einblicke in das hochaufl{\"o}sende Fernsehen der Zukunft}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-8770}, year = {2009}, abstract = {Wo genau liegt der technische Unterschied zwischen Fernsehern mit HD-ready und Full-HD? Welche {\"U}bertragungswege und Empfangsm{\"o}glichkeiten gibt es, und welche Zusatzger{\"a}te brauchen die Verbraucher, um die verbesserte Bildqualit{\"a}t ihrer hochaufl{\"o}senden TV-Ger{\"a}te voll nutzen zu k{\"o}nnen? Und ist es wichtig, ob sich das Fernsehbild „progressiv" oder „interlaced" aufbaut? Antworten auf diese und weitere Fragen gibt die neue Publikation „HD-TV - Technologische Einblicke in das hochaufl{\"o}sende Fernsehen der Zukunft". Dr. Ronald Glasberg (Technische Universit{\"a}t Berlin) hat im Auftrag des BITKOM einen Leitfaden zu grundlegenden, technologischen Einblicken in das hochaufl{\"o}sende Fernsehen der Zukunft erstellt. Die Publikation weist die optionalen {\"U}bertragungswege via Terrestrik, Kabel, Satellit, Mobilfunk oder Internet auf. Vor allem die digitalen {\"U}bertragungswege erm{\"o}glichen dem Konsumenten viele Annehmlichkeiten wie zeitversetztes Fernsehen, Video-on-Demand, das Auffinden von Schl{\"u}sselbegriffen im laufenden Programm sowie zuk{\"u}nftig mehr Interaktivit{\"a}t.}, language = {de} } @inproceedings{GlasbergSchmiedekeMocigembaetal.2008, author = {Glasberg, Ronald and Schmiedeke, Sebastian and Mocigemba, Martin and Sikora, Thomas}, title = {New Real-Time Approaches for Video-Genre-Classification using High-Level Descriptors and a Set of Classifiers}, year = {2008}, abstract = {In this paper we describe in detail the recent publications related to video-genre-classification and present our improved new approaches for classifying video sequences in real-time as 'cartoon', 'commercial', 'music', 'news' or 'sport' by analyzing the content with new high-level audio-visual descriptors and classification methods. Such applications have also been discussed in the context of MPEG-7. The results demonstrate identification rates of more than 90\% based on a large representative collection of 100 videos gathered from free digital TV and Internet.}, language = {en} } @inproceedings{GlasbergSchmiedekeKelmetal.2008, author = {Glasberg, Ronald and Schmiedeke, Sebastian and Kelm, Pascal and Sikora, Thomas}, title = {An Automatic System for Real-Time Video-Genres Detection Using High-Level Descriptors and a Set of Classifiers}, year = {2008}, abstract = {We present a new approach for classifying MPEG-2 video sequences as dasiacartoonpsila, dasiacommercialpsila, dasiamusicpsila, dasianewspsila or dasiasportpsila by analyzing specific, high-level audio-visual features of consecutive frames in real-time. This is part of the well-known video-genre-classification problem, where popular TV-broadcast genres are studied. Such applications have also been discussed in the context of MPEG-7 [1]. In our method the extracted features are logically combined using a set of classifiers to produce a reliable recognition. The results demonstrate a high identification rate based on a large representative collection of 100 video sequences (20 sequences per genre) gathered from free digital TV-broadcasting in Europe.}, language = {en} } @inproceedings{Stantchev2015, author = {Stantchev, Vladimir}, title = {Requirements Engineering and Risk Management Solutions}, year = {2015}, abstract = {Keine Angabe No details}, language = {en} } @article{Straub2015, author = {Straub, Matthias}, title = {Change the Perspective!: Successful and efficient Corporate Social Responsibility Reporting in the Hospitality Industry}, series = {Journal of Tourism Research}, volume = {10}, journal = {Journal of Tourism Research}, pages = {72 -- 81}, year = {2015}, abstract = {The reporting of Corporate Social Responsibility (CSR) in hotels plays a crucial role in the assessment of their sustainability activities. Research shows, that if the CSR commitment of hotels is interpreted by guests as a real public interest, CSR has a positive impact on brand evaluation as well as on guest satisfaction. However, the sustainability efforts of hotels are often perceived as pure self-interest and the charge of greenwashing is in the air. Thus, standards in CSR reporting are urgently required. In hospitality so far, neither guidelines for CSR reporting nor third party monitoring organizations exist so far. This paper presents a six-step framework encouraging bilateral sustainability communication in the hotel industry. The common method to proclaim sustainability via reports or websites is typically one-directional from the hotel to the guest (typically referred to as signalling approach). In the long run, this is not enough. Thus, the other direction (typically referred to as screening approach), should particularly be considered as well. Screening is achieved through the use of user generated content (UGC) and electronic word of mouth (eWOM) via evaluation platforms, which nowadays enjoy wide acceptance by guests. In the presented framework, CSR reporting and CSR rating are outsourced to the guest and the corresponding crowd. This procedure includes several advantages for hotels. First, the efforts and costs of CSR reporting are reduced. Second, the general public is used as a third-party control mechanism for the CSR reporting (typically referred to as monitoring approach). Finally, following this monitoring aspect, the perceived credibility of the CSR reporting in turn will be higher. Since the credibility and reputation of eWOM largely depend on the number of existing reviews, it is important to generate sustainability-oriented eWOM and to utilize guests for CSR reporting issues. Therefore, based on the well-known phases of service marketing, a five-step-approach is integrated in the framework.}, language = {en} } @incollection{Straub2015, author = {Straub, Matthias}, title = {Aktuelle Herausforderungen in der Hotellerie und ausgew{\"a}hlte L{\"o}sungsstrategien aus der Unternehmensrealit{\"a}t}, series = {Rundum erfolgreich im Hotelmanagement: Dimensionen und Perspektiven im 360°-Blick}, booktitle = {Rundum erfolgreich im Hotelmanagement: Dimensionen und Perspektiven im 360°-Blick}, editor = {Baierl, Ronny and Steinhauser, Carolin}, publisher = {Holzmann Medien}, address = {Bad W{\"o}rishofen}, publisher = {SRH Berlin University of Applied Sciences}, pages = {12 -- 16}, year = {2015}, abstract = {Keine Angabe No details}, language = {de} }