@misc{BraunThielZilleretal., author = {Braun, Tobias and Thiel, Christian and Ziller, Carina and Rasche, Julia and Bahns, Carolin and Happe, Lisa and Retzmann, Theresa and Gr{\"u}neberg, Christian}, title = {Prevalence of frailty in older adults in outpatient physiotherapy in an urban region in the western part of Germany : a cross-sectional study}, series = {BMJ Open}, volume = {9}, journal = {BMJ Open}, number = {6}, issn = {2044-6055}, doi = {10.1136/bmjopen-2018-027768}, pages = {14}, language = {en} } @misc{WienkeThielKopkow, author = {Wienke, Alisa Katharina and Thiel, Christian and Kopkow, Christian}, title = {Effekte von Medical Flossing bei Patienten mit Schulterbeschwerden - Randomisierte kontrollierte Pilotstudie}, series = {Physioscience}, volume = {16}, journal = {Physioscience}, number = {1}, issn = {1860-3092}, doi = {10.1055/a-1078-6882}, pages = {5 -- 15}, language = {de} } @misc{GruenebergBraunBahnsetal., author = {Gr{\"u}neberg, Christian and Braun, Tobias and Bahns, Carolin and Thiel, Christian}, title = {Diagnostik und Intervention bei {\"a}lteren Menschen mit Frailty : ein Fallbericht}, series = {Zeitschrift f{\"u}r Physiotherapeuten}, volume = {70}, journal = {Zeitschrift f{\"u}r Physiotherapeuten}, number = {9}, issn = {1614-0397}, pages = {33 -- 43}, language = {de} } @misc{ButryFoersterThieletal., author = {Butry, Lionel and F{\"o}rster, Annemarie and Thiel, Christian and Kopkow, Christian}, title = {Erwartungen von Patient*innen mit unspezifischen Kreuzschmerzen an die physiotherapeutische Behandlung im ambulanten Setting}, series = {Physioscience}, volume = {17}, journal = {Physioscience}, number = {3}, issn = {1860-3351}, doi = {10.1055/a-1331-6569}, pages = {121 -- 129}, language = {de} } @misc{BahnsHappeThieletal., author = {Bahns, Carolin and Happe, Lisa and Thiel, Christian and Kopkow, Christian}, title = {Physical therapy for patients with low back pain in Germany: a survey of current practice}, series = {BMC musculoskeletal disorders}, volume = {22}, journal = {BMC musculoskeletal disorders}, number = {1}, issn = {1471-2474}, doi = {10.1186/s12891-021-04422-2}, pages = {12}, language = {en} } @misc{BraunThielPeteretal., author = {Braun, Tobias and Thiel, Christian and Peter, Raphael and Bahns, Carolin and B{\"u}chele, Gisela and Rapp, Kilian and Becker, Clemens and Gr{\"u}neberg, Christian}, title = {Association of clinical outcome assessments of mobility capacity and incident disability in community-dwelling older adults - a systematic review and met-analysis}, series = {Ageing Research Reviews}, volume = {81}, journal = {Ageing Research Reviews}, issn = {1872-9649}, doi = {10.1016/j.arr.2022.101704}, language = {en} } @misc{KanzlerBoehmQuinkensteinetal., author = {Kanzler, Michael and B{\"o}hm, Christian and Quinkenstein, Ansgar and Steinke, Christian and Landgraf, Dirk}, title = {Wuchsleistung der Robinie auf Lausitzer Rekultivierungsstandorten}, series = {AFZ - der Wald}, journal = {AFZ - der Wald}, number = {5}, pages = {35 -- 37}, language = {de} } @misc{BaerwolffVetterBoehmetal., author = {B{\"a}rwolff, Manuela and Vetter, Armin and B{\"o}hm, Christian and Hoffmann, J{\"o}rg and Schmidt, Christian}, title = {Projekt AgroForstEnergie ? Was bringen Streifen-Kup?}, series = {energie pflanzen}, journal = {energie pflanzen}, number = {2}, issn = {1866-3036}, pages = {10 -- 12}, language = {de} } @misc{ReiterRatzkeNitschetal., author = {Reiter, Sebastian and Ratzke, Markus and Nitsch, Paul-Gregor and Mai, Christian and Spirito, Davide and Corley-Wiciak, Agnieszka Anna and Wenger, Christian and Fischer, Inga A.}, title = {Optical response of titanium nitride plasmonic nanohole arrays : impact of square and hexagonal array geometry, pitch, and nanohole diameter}, series = {Plasmonics}, volume = {20}, journal = {Plasmonics}, publisher = {Springer}, address = {New York, NY}, doi = {10.1007/s11468-025-02934-4}, pages = {8825 -- 8834}, abstract = {Plasmonic nanohole arrays (NHAs) exhibit extraordinary optical transmission (EOT) evoked by resonant excitation of surface plasmons at an excitation wavelength, which is highly sensitive to changes in refractive index in the surrounding dielectric. This can enable the use of plasmonic NHAs in on-chip refractive index sensors. Such sensors can be realized on the cost-effective silicon platform by the integration of a plasmonic NHA and a Ge photodetector, provided that complementary metal-oxide-semiconductor (CMOS)-compatible materials are used for their fabrication. Titanium nitride (TiN) as a biocompatible and CMOS-compatible plasmonic transition metal nitride is well-suited for integration on the silicon platform; however, the comparatively large losses within the material require geometry optimization strategies in order to improve the optical properties of TiN NHAs for sensing. In this work, we investigated different TiN NHA geometries both in experiment and simulation. We extensively characterized square and hexagonal arrays with varying pitches and nanohole diameters and provide a detailed comparison of their optical properties. We also discuss characterization results for surface refractive index changes imposed by depositing a thin Al2O3 layer on top of the NHAs. While we do not observe a clear advantage of hexagonal arrays compared to square arrays for sensing, our results highlight the importance of geometry optimization for TiN NHAs integrated with devices.}, language = {en} } @misc{ZaissPowellHaasetal., author = {Zaiß, Felix and Powell, John and Haas, Michael and Wahl, Johannes and Diegel, Christian and Schricker, Klaus and Bergmann, Jean Pierre and Hummel, Marc and Spurk, Christoph and Olowinsky, Alexander and Beckmann, Felix and Moosmann, Julian and Hagenlocher, Christian and Graf, Thomas}, title = {The influence of different core-ring intensity distributions on the capillary shape and resulting weld in laser welding of steel}, series = {Optics \& laser technology}, volume = {194}, journal = {Optics \& laser technology}, publisher = {Elsevier BV}, address = {Amsterdam}, issn = {0030-3992}, doi = {10.1016/j.optlastec.2025.114495}, pages = {1 -- 12}, abstract = {Laser welding was carried out using a co-axial core-ring beam, with independent control of the power to the core and the ring. The welding process was observed using high-power X-rays and high-speed imaging equipment. Adjusting the relative powers of the core and the ring beams was found to have profound effects on the shape of both the capillary created and the weld melt pool. Moderate laser power densities in the ring were found to increase the top diameter of the weld pool and reduce fluctuations in the welding process. High laser power densities in the ring led to the creation of a second capillary which largely acted independently of the capillary generated by the laser power in the core. At high power densities and welding speeds the two capillaries were almost completely separated in the direction of travel.}, language = {en} } @misc{ZaissPowellHaasetal., author = {Zaiß, Felix and Powell, John and Haas, Michael and Diegel, Christian and Schricker, Klaus and Bergmann, Jean Pierre and Spurk, Christoph and Hummel, Marc and Olowinsky, Alexander and Beckmann, Felix and Moosmann, Julian and Hagenlocher, Christian and Graf, Thomas}, title = {Core-ring laser welding : the influence of ring diameter on the capillary dynamics and the formation of pores in the resulting weld}, series = {Lasers in manufacturing and materials processing}, journal = {Lasers in manufacturing and materials processing}, publisher = {Springer Science and Business Media LLC}, address = {New York, NY}, issn = {2196-7229}, doi = {10.1007/s40516-026-00331-1}, pages = {21}, abstract = {Double-core fibers that deliver laser beams with adjustable amounts of power to the central core and the surrounding ring component of the fiber are of major interest for optimizing laser welding processes. However, the central focussed laser spot and the ring diameters are fixed by the fiber dimensions, the focusing optics, and the laser systems involved. This work investigates the influence of different ring beam diameters, with a constant central spot diameter, on the capillary dynamics and the formation of pores in the resulting welds in 1.4301 stainless steel (X5CrNi18-10, AISI 304). The different core-ring configurations were achieved using specially designed beam-shaping optics. The generation of pores during the welding process was examined by means of synchrotron X-ray imaging. The results show that different ring diameters have a profound effect on the melt pool geometry, the capillary shape and the location of the capillary collapse which gives rise to pore formation in the weld. In the examples presented here, larger ring diameters extended the melt pool in the direction of welding without contributing directly to the capillary evaporation. In this case the narrow, deep capillaries which are created by the core beam alone can bulge and collapse, trapping vapor and gas to create large pores. If, however, the ring beam has a small enough diameter, it can help to produce a wider capillary which does not trap gas and create pores in the same way. The mechanisms by which large bubbles in the melt can result in non-spherical pores in the weld are also explained.}, language = {en} } @book{KlingerRechenbergBraunetal., author = {Klinger, Klaus and Rechenberg, Karsten and Braun, Kersten and Fischer, Christian}, title = {Untersuchung des Alterungsverhaltens, der Spannungsbelastung und der Erw{\"a}rmung von Wicklungsisolationen bei Umrichterbetrieb an Niederspannungsasynchronmaschinen}, publisher = {Techn. Univ., Lehrstuhl Elektrische Maschinen und Antriebstechnik}, address = {Cottbus}, pages = {84}, abstract = {In 5 Beitr{\"a}gen wird das Alterungsverhalten von Drehstromasynchronmaschinen betrachtet. Insbesondere werden f{\"u}r die Wechselrichterspeisung von Niederspannungsasynchron-maschinen die zus{\"a}tzlichen Verluste und die Spannungsbelastung der Wicklung behandelt. Anhand experimenteller Untersuchungen von Modellen von Wicklungselementen werden f{\"u}r die "wilde" Wicklung von Niederspannungsmaschinen die Spannungsbelastungen ermittelt und deren Auswirkungen auf die Lebensdauer diskutiert.}, language = {de} } @phdthesis{Weickhardt, author = {Weickhardt, Christian}, title = {Analytical Mass Spectrometry with Lasers and Time-of-Flight Instruments}, language = {en} } @article{WeickhardtToennies, author = {Weickhardt, Christian and T{\"o}nnies, Karen}, title = {Short Pulse Laser Mass Spectrometry of Nitrotoluenes: Ionization and Fragmentation Behavior}, language = {en} }