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Polarity,intramolecular charge transfer,and hydrogen bond comediated solvent effects on the optical properties of graphene quantum dots

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Nano Research 2023年第1期16卷 45-52页

作者： Yalei Hu Christof Neumann Lena Scholtz Andrey turchanin Ute Resch-Genger Siegfried Eigler Institute of Chemistry and Biochemistry Freie Universität BerlinTakustraße 314195 BerlinGermany Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University JenaLessingstraße 1007743 JenaGermany Federal Institute for Materials Research and testing(BAM) Division BiophotonicsRichard Willstätter Straße 1112489 BerlinGermany

Graphene quantum dots(GQDs)have attracted increasing attention due to their favorable optical properties and have been widely used,e.g.,in the biomedical ***,the properties related to the chemical structure of GQDs,resulting in solventdependent optical properties,still remain ***,we present the synthesis of long-wavelength emitting GQDs with a size of about 3.6 nm via a solvothermal method using oxo-functionalized graphene(oxo-G)and p-phenylenediamine as precursors and their structural and surface chemical analysis by transmission electron and atomic force microscopy(tEM;AFM)as well as Fourier-transform infrared,Raman,and X-ray photoelectron spectroscopy(FtIR;Raman;XPS).Subsequently,the influence of solvent polarity and proticity on the optical properties of the as-prepared GQDs bearing–OH,–NH_(2),–COOH and pyridine surface groups was *** on the results of the absorption and fluorescence(FL)studies,a possible luminescence mechanism is *** observed solvent-induced changes in the spectral position of the FL maximum,FL quantum yield,and FL decay kinetics in protic and aprotic solvents of low and high polarity are ascribed to a combination of polarity effects,intramolecular charge transfer(ICt)processes,and hydrogen ***,the potential of GQDs for the optical sensing of trace amount of water was *** results of our systematic spectroscopic study will promote the rational design of GQDs and shed more light on the FL mechanism of carbon-based fluorescent nanomaterials.

关键词： graphene quantum dots(GQDs) polarity intramolecular charge transfer(ICt) hydrogen bond optical properties

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Black Silicon nanostructures on silicon thin films prepared by reactive ion etching

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Chinese Optics Letters 2013年第13期11卷 127-129页

作者： Martin Steglich thomas Kasebier Ingmar Hoger Kevin Fuchsel Andreas tiinnermann Ernst-Bernhard Kley Institute of Applied Physics A bbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 15 07745 Jena Germany Institute of Photonic technology Albert-Einstein-Str. 9 07745 Jena Germany

In this letter, the application of dry etching to thin films on glass is described. the utilized （ICP-RIE） of SF6 and 02 is discussed and a demonstrated. prepare Black Silicon nanostructures on crystalline silicon reactive ion etching with an inductively coupled plasma remarkable increase in light absorption of about 70% is demonstrated.

关键词： Reactive ion etching

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Kinematic evolution of fold-and-thrust belts in the Yubei-tangbei area: Implications for tectonic events in the southern tarim Basin

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Geoscience Frontiers 2021年第6期12卷 46-65页

作者： Yiqiong Zhang Dengfa He Bin Wu Huahua Gao friedrich-schiller-universität jena Burgweg 11Jena 07749Germany China university of Geosciences(Beijing) Beijing 100083China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China CNOOC Research Institute Ltd. Beijing 100028China China National Oil and Gas Exploration and Development Corporation Beijing 100034China

the Yubei-tangbei area in the southern tarim Basin is one of the best-preserved Early Paleozoic northeast-southwest trending fold-and-thrust belts within this *** area is crucial for the exploration of primary hydrocarbon reservoirs in northwestern *** this study,we constructed the structural geometric morphology of the Yubei-tangbei area using geophysical logs,drilling,and recent two-and three-dimensional(2-D and 3-D)seismic *** Early Paleozoic fault-propagation folds,the tangnan triangle zone,fault-detachment folds,and trishear fault-propagation folds developed with the detachment of the Middle Cambrian gypsum–salt *** to a detailed chronostratigraphic framework,the growth strata in the Upper Ordovician–Lower Silurian layer formed by onlapping the back limb of the asymmetric fault-propagation folds,which therefore defines the timing of *** changes in kink band hinges and amplitudes in the Permian–Carboniferous and Cenozoic folding strata suggest that the evolution of the fold-and-thrust belts followed a sequential evolution process rather than a simultaneous *** the pre-existing Precambrian basement structure,the Yubei-tangbei fold-and-thrust belts can be divided into four tectonic evolution stages:Late Cambrian,Late Ordovician to Early Carboniferous,Carboniferous to Permian,and *** northwestern-verging Cherchen Fault is part of the piedmont fold-and-thrust system of the southern tarim foreland *** interpreted its strata as a breakthrough trishear fault-propagation fold that developed in three phases:Mid–Late Ordovician,Silurian to Middle Devonian,and triassic to *** tectonic events are responses of the Altyn-tagh and Kunlun collisional orogenic belts and the Indian-Eurasian *** inherited deformation and structural modification in the southern tarim Basin may be an indicator of the growth and evolution of peripheral orogens.

关键词： Southern tarim Basin Seismic profile Growth strata Kunlun orogeny Altyn-tagh orogeny Cherchen Fault

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Identification of Z Cam's Historical Counterpart: the Quest for an Ancient Nova

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Research in Astronomy and Astrophysics 2024年第12期24卷 33-44页

作者： Bo-Shun Yang Susanne M.Hoffmann university of Science and technology of China Dept.of the History of Science and Scientific Archaeology friedrich schiller university of jena Faculty of Mathematics and Computer ScienceFUSION Group

In recent astronomical discussions, attempts have been made to link the known dwarf nova Z Cam to historical celestial events, particularly the “guest star” phenomenon reported in China in 77 BCE. Despite other suggestions and the problems with regard to the location of the event in 77 BCE, its identification with Z Cam is used in the Variable Star Index of the AAVSO and in several research papers that aim to derive knowledge on the evolution of cataclysmic variables. through the reconstruction of the super-constellation of the Purple Palace in the Han Dynasty, we found that Z Cam is actually located outside this enclosure, contradicting the records of the 77 BCE guest star being “within the Purple Palace.” With newly found text versions of the guest star in 77 BCE, we narrowed down the position given therein. Combining with a new analysis of accompanying divination text leads to the conclusion that this guest star was actually a comet. Finally, through meticulous examination and comparison, we conclude that the guest star of 369 CE appears the most plausible candidate for Z Cam's historical counterpart, aligning with both textual evidence and modern astronomical observations.

关键词： (Stars:) novae Cataclysmic variables History and philosophy of astronomy Stars: dwarf novae Stars: evolution

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Stuck in time – a new Chaenothecopsis species with proliferating ascomata from Cunninghamia resin and its fossil ancestors in European amber

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Fungal Diversity 2013年第1期58卷 199-213页

作者： H.tuovila Hanna tuovila Alexander R.Schmidt Christina Beimforde Heinrich Dörfelt Heinrich Grabenhorst Jouko Rikkinen Department of Biosciences University of HelsinkiP.O.Box 6500014 HelsinkiFinland Courant Research Centre Geobiology Georg-August-Universität GöttingenGoldschmidtstraße 337077 GöttingenGermany Mikrobielle Phytopathologie Friedrich-Schiller-Universität JenaNeugasse 2507743 JenaGermany Nachtigallenweg 9 29342 WienhausenGermany

Resin protects wounded trees from microbial infection,but also provides a suitable substrate for the growth of highly specialized *** proliferatus is described growing on resin of Cunninghamia lanceolata from Hunan Province,*** new fungus is compared with extant species and two new fossil specimens from Eocene Baltic and Oligocene Bitterfeld *** Oligocene fossil had produced proliferating ascomata identical to those of the newly described species and to other extant species of the same *** morphology may represent an adaptation to growing near active resin flows:the proliferating ascomata can effectively rejuvenate if partially overrun by fresh,sticky *** growth of fungal hyphae into resin has only been documented from Cenozoic amber fossils suggesting comparatively late occupation of resin as substrate by ***,resinicolous Chaenothecopsis species were already well adapted to their special ecological niche by the Eocene,and the morphology of these fungi has since remained remarkably constant.

关键词： Fossil fungi Proliferating ascomata Resin compounds Ecology taxonomy

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DNA Damage Response in Hematopoietic Stem Cell Ageing

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Genomics, Proteomics & Bioinformatics 2016年第3期14卷 147-154页

作者： tangliang Li Zhong-Wei Zhou Zhenyu Ju Zhao-Qi Wang Institute of Aging Research School of MedicineHangzhou Normal UniversityHangzhou 311121China Leibniz Institute on Aging-Fritz Lipmann Institute(FLI) Jena D-07745Germany Faculty of Biology and Pharmacy Friedrich-Schiller University of JenaJena D-07745Germany

Maintenance of tissue-specific stem cells is vital for organ homeostasis and organismal *** stem cells（HSCs） are the most primitive cell type in the hematopoietic *** divide asymmetrically and give rise to daughter cells with HSC identity（selfrenewal） and progenitor progenies（differentiation）,which further proliferate and differentiate into full hematopoietic *** ageing process is accompanied with abnormalities in the HSC self-renewal and *** changes and epigenetic modulations have been implicated as the key regulators in HSC ageing *** DNA damage response（DDR）in the cells involves an orchestrated signaling pathway,consisting of cell cycle regulation,cell death and senescence,transcriptional regulation,as well as chromatin *** studies employing DNA repair-deficient mouse models indicate that DDR could intrinsically and extrinsically regulate HSC maintenance and play important roles in tissue homeostasis of the hematopoietic *** this review,we summarize the current understanding of how the DDR determines the HSC fates and finally contributes to organismal ageing.

关键词： Hematopoietic stem cells DNA damage response Epigenetics Ageing P53

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the Ca^(2+)-sensing receptor and the pocketome:comparing nature's complexity with human intervention in receptor modulation

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Signal transduction and targeted therapy 2024年第8期9卷 3153-3154页

作者： Edda S.F.Matthees Carsten Hoffmann Institut fur Molekulare Zellbiologie CMB-Center for Molecular BiomedicineUniversitatsklinikum JenaHans-Knoll StraBe 2D-07745 JenaGermany friedrich-schiller-universitat jena Hans-KnollStraBe2D-07745 JenaGermany

In a recent paper published in Nature,the relatively understudied Ca^(2+)-sensing,receptor(CasR)within the Gprotein-coupled receptor(GPCR)family C,gained attention due to pioneering research led by Georgios Skiniotis ... 详细信息

关键词： Stanford gained Skin

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Exploring new avenues in high repetition rate table-top coherent extreme ultraviolet sources

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Light(Science & Applications) 2015年第1期4卷 231-236页

作者： Steffen Hadrich Manuel Krebs Armin Hoffmann Arno Klenke Jan Rothhardt Jens Limpert Andreas tunnermann friedrich-schiller-universitat jena Institute of Applied PhysicsAbbe Center of PhotonicsAlbert-Einstein-Straße 1507745 JenaGermany Helmholtz-Institute jena Frobelstieg 307743 JenaGermany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 707745 JenaGermany

the process of high harmonic generation(HHG)enables the development of table-top sources of coherent extreme ultraviolet(XUV)*** these are now matured sources,they still mostly rely on bulk laser technology that limits the attainable repetition rate to the low kilohertz ***,many of the emerging applications of such light sources(e.g.,photoelectron spectroscopy and microscopy,coherent diffractive imaging,or frequency metrology in the XUV spectral region)require an increase in the repetition ***,these sources are operated with a multi-MHz repetition rate and deliver a high photon flux *** far,this regime has been solely addressed using passive enhancement cavities together with low energy and high repetition rate ***,a novel route with significantly reduced complexity(omitting the requirement of an external actively stabilized resonator)is demonstrated that achieves the previously mentioned demanding parameters.A krypton-filled Kagome photonic crystal fiber is used for efficient nonlinear compression of 9 μJ,250 fs pulses leading to,7 μJ,31 fs pulses at 10.7 MHz repetition *** compressed pulses are used for HHG in a gas *** attention is devoted to achieving phase-matched(transiently)generation yielding.10^(13) photons s^(-1)(.50 μW)at 27.7 *** new spatially coherent XUV source improved the photon flux by four orders of magnitude for direct multi-MHZ experiments,thus demonstrating the considerable potential of this source.

关键词： coherent extreme ultraviolet sources high average power high harmonic generation nonlinear compression ultrafast laser

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Real-time molecular imaging of near-surface tissue using Raman spectroscopy

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Light(Science & Applications) 2022年第5期11卷 820-831页

作者： Wei Yang Florian Knorr Ines Latka Matthias Vogt Gunther O.Hofmann Jürgen Popp Iwan W.Schie Leibniz Institute of Photonic technology jena Albert-Einstein-Straße 907745 JenaGermany Department of trauma Hand and Reconstructive SurgeryUniversity Hospital JenaAm Klinikum 107747 JenaGermany Institute of Physical Chemistry and Abbe Center of Photonics Friedrich-Schiller University JenaHelmholtzweg 407743 JenaGermany Department of Medical Engineering and Biotechnology University of Applied Sciences-JenaCarlZeiss-Promenade 207745 JenaGermany

the steady progress in medical diagnosis and treatment of diseases largely hinges on the steady development and improvement of modern imaging *** spectroscopy has attracted increasing attention for clinical applications as it is label-free,non-invasive,and delivers molecular fingerprinting information of a *** combination with fiber optic probes,it also allows easy access to different body parts of a ***,image acquisition with fiber optic probes is currently not ***,we introduce a fiber optic probe-based Raman imaging system for the real-time molecular virtual reality data visualization of chemical boundaries on a computer screen and the physical *** approach is developed around a computer vision-based positional tracking system in conjunction with photometric stereo and augmented and mixed chemical reality,enabling molecular imaging and direct visualization of molecular boundaries of three-dimensional *** proposed approach achieves a spatial resolution of 0.5 mm in the transverse plane and a topology resolution of 0.6 mm,with a spectral sampling frequency of 10 Hz,and can be used to image large tissue areas in a few minutes,making it highly suitable for clinical tissueboundary demarcation.A variety of applications on biological samples,i.e.,distribution of pharmaceutical compounds,brain-tumor phantom,and various types of sarcoma have been characterized,showing that the system enables rapid and intuitive assessment of molecular boundaries.

关键词： diagnosis enable intuitive

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A hybrid algorithm for reengineering the refractive index profile of inhomogeneous coatings from optical in-situ broadband monitoring data

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光学精密工程 2005年第4期13卷 487-491页

作者： S. Wilbrandt O. Stenzel D. Gbler N. Kaiser friedrich-schiller-universitt jena Institut für Angewandte Physik Max-Wien-Platz 1 07743 Jena GermanyFraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena GermanyFraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena GermanyFraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena Germany

Reengineering the refractive index profile of inhomogeneous coatings is a troublesome task. Multiplicity of solutions may significantly reduced by providing additional information. For this reason an in-situ broadband monitoring system was developed to measure the transmittance of the growing film directly at the rotating substrate. For characterization of these coatings, a new model was developed, which significantly reduces the number of parameters. the refractive index profile may be described by a proper number of equally spaced volume fraction values using the Bruggeman effective media approach. A good initial approximation of the refractive index profile can be generated based on deposition rates for both materials recorded with quartz crystal monitor during manufacturing. During the optimization process, a second order minimization algorithm was used to vary the refractive index profile of the whole coating and film thickness of the intermediate stages. Finally, a significantly improved accuracy of the modelled transmittance was achieved.

关键词：光学涂覆技术折射率宽带混合模型管理方式

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