@article{64028, author = {{Ratajczyk, Tomasz and Gutmann, Torsten and Bernatowicz, Piotr and Buntkowsky, Gerd and Frydel, Jaroslaw and Fedorczyk, Bartlomiej}}, journal = {{Chemistry A European Journal}}, number = {{36}}, pages = {{12616–12619}}, title = {{{NMR Signal Enhancement by Effective SABRE Labeling of Oligopeptides}}}, doi = {{10.1002/chem.201501552}}, volume = {{21}}, year = {{2015}}, } @article{64013, author = {{Liu, Jiquan and Plog, Andreas and Groszewicz, Pedro and Zhao, Li and Xu, Yeping and Breitzke, Hergen and Stark, Annegret and Hoffmann, Rudolf and Gutmann, Torsten and Zhang, Kai and Buntkowsky, Gerd}}, journal = {{Chemistry A European Journal}}, number = {{35}}, pages = {{12414–12420}}, title = {{{Design of a Heterogeneous Catalyst Based on Cellulose Nanocrystals for Cyclopropanation: Synthesis and Solid-State NMR Characterization}}}, doi = {{10.1002/chem.201501151}}, volume = {{21}}, year = {{2015}}, } @article{63972, author = {{Harrach, M. and Drossel, B. and Winschel, W. and Gutmann, Torsten and Buntkowsky, G.}}, issn = {{1932-7447}}, journal = {{Journal of Physical Chemistry C}}, pages = {{28961–28969}}, title = {{{Mixtures of Isobutyric Acid and Water Confined in Cylindrical (Silica)Nanopores Revisited - A Combined Solid-State NMR and Molecular Dynamics Simulation Study}}}, volume = {{119}}, year = {{2015}}, } @article{63963, abstract = {{A novel heterogeneous dirhodium catalyst has been synthesized. This stable catalyst is constructed from dirhodium acetate dimer (Rh2(OAc)4) units, which are covalently linked to amine- and carboxyl-bifunctionalized mesoporous silica (SBA-15NH2COOH). It shows good efficiency in catalyzing the cyclopropanation reaction of styrene and ethyl diazoacetate (EDA) forming cis- and trans-1-ethoxycarbonyl-2-phenylcyclopropane. To characterize the structure of this catalyst and to confirm the successful immobilization, heteronuclear solid-state NMR experiments have been performed. The high application potential of dynamic nuclear polarization (DNP) NMR for the analysis of binding sites in this novel catalyst is demonstrated. Signal-enhanced 13C CP MAS and 15N CP MAS techniques have been employed to detect different carboxyl and amine binding sites in natural abundance on a fast time scale. The interpretation of the experimental chemical shift values for different binding sites has been corroborated by quantum chemical calculations on dirhodium model complexes.}}, author = {{Gutmann, Torsten and Liu, Jiquan and Rothermel, Niels and Xu, Yeping and Jaumann, Eva and Werner, Mayke and Breitzke, Hergen and Sigurdsson, Snorri T. and Buntkowsky, Gerd}}, journal = {{Chemistry A European Journal}}, keywords = {{heterogeneous catalysis, immobilized catalyst, dynamic nuclear polarization, hyperpolarization, NMR spectroscopy}}, number = {{9}}, pages = {{3798–3805}}, publisher = {{WILEY-VCH Verlag}}, title = {{{Natural Abundance 15N NMR by Dynamic Nuclear Polarization: Fast Analysis of Binding Sites of a Novel Amine-Carboxyl-Linked Immobilized Dirhodium Catalyst}}}, doi = {{10.1002/chem.201405043}}, volume = {{21}}, year = {{2015}}, } @article{63937, author = {{Cano, Israel and Huertos, Miguel A. and Chapman, Andrew M. and Buntkowsky, Gerd and Gutmann, Torsten and Groszewicz, Pedro B. and van Leeuwen, Piet W. N. M.}}, journal = {{Journal of the American Chemical Society}}, number = {{24}}, pages = {{7718–7727}}, title = {{{Air-Stable Gold Nanoparticles Ligated by Secondary Phosphine Oxides as Catalyst for the Chemoselective Hydrogenation of Substituted Aldehydes: a Remarkable Ligand Effect}}}, doi = {{10.1021/jacs.5b02802}}, volume = {{137}}, year = {{2015}}, } @article{63935, author = {{Buntkowsky, Gerd and Gutmann, Torsten}}, journal = {{Angewandte Chemie International Edition}}, number = {{33}}, pages = {{9450–9451}}, title = {{{A Mousetrap for Carbenium Ions: NMR Detectives at Work}}}, doi = {{10.1002/anie.201504899}}, volume = {{54}}, year = {{2015}}, } @misc{13896, author = {{Olfert, Sergei and Henning, Bernd}}, isbn = {{978-3-939296-08-9}}, pages = {{1560--1561}}, publisher = {{Deutsche Gesellschaft für Akustik e.V}}, title = {{{Schallfeldcharakterisierung mittels Schlierentechnik}}}, year = {{2015}}, } @article{59693, abstract = {{Injecting spin-polarized carriers into semiconductor lasers provides important opportunities to extend what is known about spintronic devices, as well as to overcome many limitations of conventional (spin-unpolarized) lasers. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we study how its operation properties can be modified by spin-polarized carriers, carrier density, and resonant cavity design. We reveal that by applying a uniaxial strain, it is possible to attain a large birefringence. While such birefringence is viewed as detrimental in conventional lasers, it could enable fast polarization oscillations of the emitted light in spin lasers, which can be exploited for optical communication and high-performance interconnects. The resulting oscillation frequency (>200 GHz) would significantly exceed the frequency range possible in conventional lasers.}}, author = {{Faria Junior, Paulo E. and Xu, Gaofeng and Lee, Jeongsu and Gerhardt, Nils Christopher and Sipahi, Guilherme M. and Žutić, Igor}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{7}}, publisher = {{American Physical Society (APS)}}, title = {{{Toward high-frequency operation of spin lasers}}}, doi = {{10.1103/physrevb.92.075311}}, volume = {{92}}, year = {{2015}}, } @inbook{50379, author = {{Ortgiese, Malte}}, booktitle = {{Ausgewählte Probleme des Logistikmanagements}}, editor = {{Betz, Stefan}}, isbn = {{978-3-8300-7958-3}}, pages = {{91--108}}, publisher = {{Dr. Kovac}}, title = {{{Klassenspezifische und zeitraumbezogene Logistikmengenprognose}}}, volume = {{52}}, year = {{2015}}, } @article{3672, author = {{Harteis, Christian and Billett, Stephen and Goller, Michael and Rausch, Andreas and Seifried, Jürgen}}, journal = {{International journal of training research}}, number = {{1}}, pages = {{64----81}}, title = {{{Effects of age, gender and occupation on perceived workplace learning support}}}, doi = {{10.1080/14480220.2015.1051349}}, volume = {{13}}, year = {{2015}}, } @inproceedings{64444, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{The European Conference on Lasers and Electro-Optics 2015}}, title = {{{Tu­ning the fre­quen­cy of po­la­riza­t­i­on oscil­la­ti­ons in spin VC­SELs by me­cha­ni­cal strain in­duc­tion in GHz-ran­ge}}}, year = {{2015}}, } @inproceedings{64441, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin and Pusch, T. and Michalzik, Rainer}}, booktitle = {{The European Conference on Lasers and Electro-Optics 2015}}, title = {{{Increasing the birefringence of VCSELs beyond 250 GHz}}}, year = {{2015}}, } @unpublished{64442, author = {{Schellenberg, Falk and Finkeldey, Markus and Richter, Bastian and Gerhardt, Nils Christopher and Hofmann, Martin R. and Paar, Christof and Schäpers, Maximilian}}, title = {{{On the complexity reduction of laser fault injection campaigns using OBIC measurements}}}, year = {{2015}}, } @article{64430, author = {{Ad­in­da-Oug­ba, Adamou and Koukourakis, Nektarios and Gerhardt, Nils Christopher and Hofmann, Martin}}, journal = {{Current directions in biomedical engineering}}, number = {{1}}, pages = {{261 -- 264}}, title = {{{Simple concept for a wide-field lensless digital holographic microscope using a laser diode}}}, doi = {{10.1515/cdbme-2015-0065}}, volume = {{1}}, year = {{2015}}, } @inproceedings{64432, author = {{Cherkashin, Maxim N. and Brenner, Carsten and Schnitzler, Lena and Döpke, Benjamin and Gerhardt, Nils Christopher and Hofmann, Martin}}, booktitle = {{Opto-acoustic methods and applications in biophotonics II}}, title = {{{Laser-diode-based photoacoustic setup to analyze Grüneisen relaxation-effect induced signal enhancement}}}, doi = {{10.1117/12.2183957}}, year = {{2015}}, } @inproceedings{64436, author = {{Lindemann, Markus and Höpfner, Henning and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{Vertical-cavity surface-emitting lasers XIX}}, pages = {{1 -- 7}}, title = {{{Ultrafast polarization dynamics with controlled polarization oscillations in vertical-cavity surface-emitting lasers}}}, doi = {{10.1117/12.2076920}}, year = {{2015}}, } @inproceedings{64443, author = {{Lindemann, Markus and Höpfner, Henning and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{Spintronics VIII}}, title = {{{Towards high frequency operation of polarization oscillations in spin vertical-cavity surface-emitting lasers}}}, doi = {{10.1117/12.2197969}}, year = {{2015}}, } @article{64435, author = {{Lindemann, Markus and Höpfner, Henning and Gerhardt, Nils Christopher and Hofmann, Martin and Pusch, Tobias and Michalzik, Rainer}}, journal = {{79. Jahrestagung der DPG und DPG-Frühjahrstagung}}, title = {{{Controlling the frequency of ultra-fast polarization oscillations in Spin-VCSELs}}}, year = {{2015}}, } @inproceedings{64440, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, T. and Michalzik, R.}}, title = {{{Tuning the frequency of polarization oscillations in spin-VCSELs by mechanical strain induction}}}, year = {{2015}}, } @inproceedings{64437, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, T. and Michalzik, R.}}, title = {{{Increasing the birefringence of VCSELs beyond 250 GHz}}}, year = {{2015}}, }