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Collecting volunteered geographic information from the Global Navigation Satellite System(GNSS):experiences from the CAMALIOT project

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International Journal of Digital Earth 2023年第1期16卷 2818-2841页

作者： Linda See Benedikt Soja Grzegorz Klopotek Tobias Sturn Rudi Weinacker Santosh Karanam Ivelina Georgieva Yuanxin Pan Laura Crocetti markus rothacher Vicente Navarro Steffen Fritz Ian McCallum Novel Data Ecosystems for Sustainability Research Group International Institute for Applied Systems Analysis(IIASA)LaxenburgAustria Institute of Geodesy and Photogrammetry ETH ZurichZurichSwitzerland Navigation Science Office European Space Agency(ESA)MadridSpain

Raw observations(carrier-phase and code observations)from the Global Navigation Satellite System(GNSS)can now be accessed from Android mobile phones(Version 7.0 onwards).This paves the way for GNSS data to be utilized for low-cost precise positioning or in ionospheric or tropospheric *** paper presents results from data collection campaigns using the CAMALIOT mobile *** the frst campaign,116.3 billion measurements from 11,828 mobile devices were collected from all *** participation decreased during the second campaign,data are still being collected *** this contribution,we demonstrate the potential of volunteered geographic information(VGl)from mobile phones to fill data gaps in geodetic station networks that collect GNSS data,*** Brazil,but also how the data can provide a denser set of observations than current networks in countries across *** also show that mobile phones capable of dual-frequency reception,which is an emerging technology that can provide a richer source of GNSS data,are contributing in a substantial ***,we present the results from a survey of participants to indicate that participation is diverse in terms of backgrounds and geography,where the dominant motivation for participation is to contribute to scientific research.

关键词： Citizen science crowdsourcing volunteered geographicinformation(VGl) global navigation satellite system(GNSS) mobile apps Earth observation

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Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

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Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： Carina Hromada Patrick Heimel markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek Xavier Monforte Johannes C.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian Cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University Clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGCs). However, the use of tNGCs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGC would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGCs and compared the various features of these improved silk^(+) tNGCs with the tubes without holes(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGCs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGCs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGCs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGCs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

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Extending harmonized national forest inventory herb layer vegetation cover observations to derive comprehensive biomass estimates

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Forest Ecosystems 2020年第2期7卷 201-214页

作者： markus Didion Forest Resources and Management Swiss Federal Research Institute WSLZürcherstrasse 1118903 BirmensdorfSwitzerland

Background:National forest inventories(NFI)have a long history providing data to obtain nationally representative and accurate estimates of growing ***,in most NFIs additional data are collected to provide information on a range of forest ecosystem functions such as biodiversity,habitat,nutrient and carbon *** important driver of nutrient and C cycling is decomposing biomass produced by forest *** studies have demonstrated that understory vegetation,particularly annual plant litter of the herb layer can contribute significantly to nutrient and C cycling in forests.A methodology to obtain comprehensive,consistent and nationally representative estimates of herb layer biomass on NFI plots could provide added value to NFIs by complementing the existing strong basis of biomass estimates of the tree and tall shrub *** study was based on data from the Swiss NFI since it covers a large environmental gradient,which extends its applicability to other ***:Based on data from 405 measurements in nine forest strata,a parsimonious model formulation was identified to predict total and non-ligneous herb layer *** herb layer cover,elevation was the main statistically significant explanatory variable for *** regression models accurately predicted biomass based on absolute percentage cover(for total biomass:R2=0.65,p=0;for non-ligneous biomass:R2=0.76;p=0)as well as on cover classes(R2=0.83;p=0;and R2=0.79,p=0),which are typically used in *** good performance was supported by the verification with data from repeated *** the 2 nd,3 rd,and 4 th Swiss NFI estimates of non-ligneous above-ground herb layer biomass 586.6±7.7,575.2±7.6,and 586.7±7.9 kg·ha-1,***:The study presents a methodology to obtain herb layer biomass estimates based on a harmonized and standardized attribute available in many *** result of this study was a parsimonious model requiring only elevation data of sample plo

关键词： Model ENFIN Switzerland Ground layer Herbs Ferns Grasses Shrubs Carbon Litter

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Robustness evaluation of cutting tool maintenance planning for soft ground tunneling projects

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Underground Space 2018年第1期3卷 72-85页

作者： Alena Conrads markus Scheffer markus Konig markus Thewes Inastitute of Tunneling cand Construction Management Ruhr-Universitat BochunGermany Chair of Computing in Engineering Ruhr-Universitit BochunGermany

Tunnel boring machines require extensive maintenance and inspection effort to provide a high *** cutting tools of the cutting wheel must be changed timely upon reaching a critical *** one possible maintenance strategy is to change tools only when it is absolutely necessary,tools can also be changed preventively to avoid further *** different maintenance strategies inﬂuence the maintenance duration and the overall project ***,determine downtime related to a particular mainte-nance strategy is still a challenging *** paper shows an analysis of the robustness to achieve the planned project performance of a maintenance strategy considering uncertainties of wear behavior of the cutting tools.A simulation based analysis is presented,imple-menting an empirical wear prediction *** strategies of maintenance planning are compared by performing a parameter vari-ation study including Monte-Carlo *** maintenance costs are calculated and evaluated with respect to their ***,an improved and robust maintenance strategy has been determined.

关键词： Mechanized tunneling,Maintenance Wear of cutting tools Process simulation Robustness Uncertainty modeling

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Polymer coated nanowire network promises self-healing and superstretchable conductors

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Science China Chemistry 2019年第2期62卷 151-152页

作者： markus Antonietti Max Planck Institute for Colloids and Interfaces Potsdam-Golm Science Park

The generation of stretchable conductors is a mandatory precondition for the next-generation electronic devices ineluding flexible,wearable electronics,smart skins and bioinspired devices [1-4].This new class of electronic materials takes up external mechanical deformations and maintains structural integrity and electronic performance throughout bending,folding and stretching *** intense efforts have been devoted to the construction of stretchable conductors,large stretchability is still difficult to achieve.

关键词： generation Polymer stretchable

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Nacre replication: down to the bottom

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Science Bulletin 2016年第21期61卷 1662-1664页

作者： markus Antonietti Max Planck Institute for Colloids and Interfaces Potsdam-Golm Science ParkAm Muhlenberg 1144776 PotsdamGermany

Organisms always have limited options when constructing their hard tissues. Therefore, they appeal to the combination of soft and hard materials with structural designs at multiscale , creating a performance well beyond the ones of the single components. Nacre, the inner shell of some mollusks, is famous for its extraordinary mechanical and optical property through optimized hierarchical structural design with thin aragonite platelets （- 95 wt%） glued together by organic components （- 5 wt% of chitin and proteins）.

关键词： down to the bottomNacre replication

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A 'hot' oil sorbent for fast cleanup of viscous crude-oil spills

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National Science Review 2018年第4期5卷 445-446页

作者： markus Antonietti Max Planck Institute for Colloids and Interfaces

In 2010,the Gulf of Mexico oil spill created the largest environmental ocean accident in *** estimated number of 4.9 million barrels of crude oil were released into the ocean and brought severe damage to the marine ecosystems and fishing,and threatened the health of *** oil cleanup technologies,including skimmers,dispersants and controlled burning,were used to treat the

关键词： hot oil sorbent for fast cleanup of viscous crude-oil spills

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The Effect of Grain Properties for Artificial Bedload Supply

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四川大学学报（工程科学版） 2005年第S1期37卷 30-33页

作者： markus PROMNY Inst.of Hydrosciences Gennan Armed Forces Univ.Munich85577 NeubibergGermany

The German Armed Forces University in Munich has conducted experiments in a laboratory flume to determine the influence of roundness on bed load *** investigations were assigned by the German Federal Institute of Hydrology (BIG),with a focus on incipient motion,transport velocity and the depth of mixing into the riverbed. The results of the experiments show that the transport velocity of angular graim is lower and the critical shear stress for incipient motion is slightly higher than of well-ro...

关键词： bed load supply bed load transport grain properties roundness tracer experiments incipient motion transport velocity

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Supercompressible conductive hydrogels in harsh environments

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Science China Materials 2023年第1期66卷 419-420页

作者： markus Antonietti Department of Colloid Chemistry Max Planck Institute for Colloids and Interfaces14476 PotsdamGermany

Conductive hydrogels are key materials for the further development of flexible and wearable electronics,bioelectronics and soft robotics,due to their soft conformability to the curved surfaces and intelligent response to mechanical stimuli[1-6].The mechanical properties of currently used hydrogels,especially in harsh environments,are far inferior to those of natural tissues,which creates a mechanical contrast and causes the related mechanical failures shortening the lifetime.

关键词： hydrogel compressible curved

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Small and simple:next-generation miniaturized diffraction-based spectrometer with computational reconstruction algorithms

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Light(Science & Applications) 2024年第6期13卷 1008-1011页

作者： markus Suta Inorganic Photoactive Materials Faculty of Mathematics and Natural SciencesHeinrich Heine University DusseldorfDusseldorfGermany

An ultra-simple and miniaturized spectrometer using an arbitrarily shaped pinhole as diffraction element reconstructs a broadband spectrum from the information of diffraction of monochromatic radiation by clever computational reconstruction *** circumvents complex calibration procedures and paves the way to cost-effective on-chip spectrometers combining fast acquisition without significant loss in spectral resolution.

关键词： arbitrarily shaped element

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