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An Alkali Activated Binder for High Chemical Resistant Self-Leveling Mortar

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Open Journal of Composite Materials 2016年第4期6卷 132-142页

作者： Henrik L. Funke Sandra Gelbrich lothar kroll Institute of Lightweight Structures Technische Universitat Chemnitz Chemnitz Germany

This paper reports the development of an Alkali Activated Binder (AAB) with an emphasis on the performance and the durability of the AAB-matrix. For the development of the matrix, the reactive components granulated slag and coal fly ash were used, which were alkali activated with a mixture of sodium hydroxide (2 - 10 mol/l) and aqueous sodium silicate solution (SiO2/Na2O molar ratio: 2.1) at ambient temperature. A sodium hydroxide concentration of 5.5 mol/l revealed the best compromise between setting time and mechanical strengths of the AAB. With this sodium hydroxide concentration, the compressive and the 3-point bending tensile strength of the hardened AAB were 53.4 and 5.5 MPa respectively after 14 days. As a result of the investigation of the acid resistance, the AAB-matrix showed a very high acid resistance in comparison to ordinary Portland cement concrete. In addition, the AAB had a high frost resistance, which had been validated by the capillary suction, internal damage and freeze thaw test with a relative dynamic E-Modulus of 93% and a total amount of scaled material of 30 g/m2 after 28 freeze-thaw cycles (exposure class: XF3).

关键词： Alkali Activated Binder Geopolymer Durability Chemical Resistance

Fiber-Reinforced Polymers Based Rebar and Stirrup Reinforcing Concrete Structures

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材料科学与工程（中英文A版） 2018年第2期8卷 47-54页

作者： Marco Lindner Konrad Vanselow Sandra Gelbrich lothar kroll Faculty of Engineering Technische Universitat Chemnitz Chemnitz 09107 Germany

Function-Integrative Textile Reinforced Concrete Shells

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Open Journal of Composite Materials 2018年第4期8卷 161-174页

作者： Sandra Gelbrich Henrik L. Funke lothar kroll Institute of Lightweight Structures Technische Universit&auml t Chemnitz Chemnitz Germany

This paper presents the development and technological implementation of textile reinforced concrete (TRC) shells with integrated functions, such as illumination and light control. In that regard the establishment of material, structural and technological foundations along the entire value chain are of central importance: From the light-weight design idea to the demonstrator and reference object, to the technological implementation for the transfer of the research results into practice. The development of the material included the requirement-oriented composition of a high-strength fine grained concrete with an integrated textile reinforcement, such as carbon knitted fabrics. Innovations in formwork solutions provide new possibilities for concrete constructions. So, a bionic optimized shape of the pavilion was developed, realized by four connected TRC-lightweight-shells. The thin-walled TRC-shells were manufactured with a formwork made of glass-fibre reinforced polymer (GFRP). An advantage of the GFRP-formwork is the freedom of design concerning the formwork shape. Moreover, an excellent concrete quality can be achieved, while the production of the precast concrete components is simple and efficient simultaneously. After the production the new TRC-shells were installed and assembled on the campus of TU-Chemnitz. A special feature of the research pavilions are the LED light strips integrated in the shell elements, providing homogeneous illumination.

关键词： Textile Reinforced Concrete Carbon Reinforced Concrete Textile Reinforced Composites Function-Integrated Lightweight Structures Glass-Fibre Reinforced Polymer Formwork Thin-Walled Shells

Dimensioning of Punctiform Metal-Composite Joints: A Section-Force Related Failure Criterion

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Open Journal of Composite Materials 2014年第3期4卷 157-172页

作者： Holger Seidlitz Lars Ulke-Winter Colin Gerstenberger lothar kroll Institute of Lightweight Structures Chemnitz University of Technology Chemnitz Germany

Reliable line production processes and simulation tools play a central role for the structural integration of thermoplastic composites in advanced lightweight constructions. Provided that material-adapted joining technologies are available, they can be applied in heavy-duty multi-material designs (MMD). A load-adapted approach was implemented into the new fully automatic and fault-tolerant thermo mechanical flow drill joining (FDJ) concept. With this method it is possible to manufacture reproducible high strength FRP/metal-joints within short cycle times and without use of extra joining elements for the first time. The analysis of FDJ joints requires a simplified model of the joint to enable efficient numerical simulations. The present work introduces a strategy in modeling a finite-element based analogous-approach for FDJ-joints with glass fiber reinforced polypropylene and high-strength steel. Combined with a newly developed section-force related failure criterion, it is possible to predict the fundamental failure behavior in multi-axial stress states. The functionality of the holistic approach is illustrated by a demonstrator that represents a part of a car body-in-white structure. The comparison of simulated and experimentally determined failure loads proves the applicability for several combined load cases.

关键词： Composites Multi-Material-Design Hybrid Joining Failure Criterion FDJ Joint

Unsymmetrical Fibre-Reinforced Plastics for the Production of Curved Textile Reinforced Concrete Elements

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Open Journal of Composite Materials 2014年第4期4卷 191-200页

作者： Henrik L.Funke Sandra Gelbrich Andreas Ehrlich Lars Ulke-Winter lothar kroll Institute of Lightweight Structures Technische Universitat ChemnitzChemnitzGermany

A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allow the manufacturing of single and double-curved textile reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). Using the unusual structural behavior caused by anisotropy, these GFRP formwork elements permit a specific adjustment of defined curvature. The system design of the developed GFRP formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads.

关键词： Anisotropic Formworks Textile-Reinforced Concrete Fibre-Reinforced Plastics Curved Concrete

Systematic Characterization of Cell Cycle Phase-dependent Protein Dynamics and Pathway Activities by High-content Microscopy-assisted Cell Cycle Phenotyping

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Genomics, Proteomics & Bioinformatics 2014年第6期12卷 255-265页

作者： Christopher Bruhn Torsten kroll Zhao-Qi Wang Leibniz Institute for Age Research – Fritz Lipmann Institute (FLI) IFOM – FIRC Institute of Molecular Oncology Faculty of Biology and Pharmacy Friedrich Schiller University of Jena

Cell cycle progression is coordinated with metabolism, signaling and other complex cellular functions. The investigation of cellular processes in a cell cycle stage-dependent manner is often the subject of modern molecular and cell biological research. Cell cycle synchronization and immunostaining of cell cycle markers facilitate such analysis, but are limited in use due to unphysiological experimental stress, cell type dependence and often low flexibility. Here, we describe high-content microscopy-assisted cell cycle phenotyping（hi MAC）, which integrates high-resolution cell cycle profiling of asynchronous cell populations with immunofluorescence microscopy. hi MAC is compatible with cell types from any species and allows for statistically powerful, unbiased, simultaneous analysis of protein interactions, modifications and subcellular localization at all cell cycle stages within a single sample. For illustration, we provide a hi MAC analysis pipeline tailored to study DNA damage response and genomic instability using a 3–4-day protocol,which can be adjusted to any other cell cycle stage-dependent analysis.

关键词： hi MAC Non-invasive cell cycle assay Cell cycle profiling DNA damage markers Imaging

Delayed spontaneous reversibility of left bundle branch block in non-ischemic cardiomyopathy: a case report

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Journal of Geriatric Cardiology 2020年第3期17卷 164-168页

作者： Marcus VH Carvalho Priscila C kroll Vinicius N Carvalho Department of Cardiothoracic Medicine JundiaíMedical SchoolJundiaíSPBrazil Transplant Hospital E J Zerbini Sao PauloSPBrazil Municipal Hospital Mario Gatti CampinasSao PauloSPBrazil

Left bundle branch block(LBBB)causes a delay in left ventricular contraction with an unsynchronized ventricular *** is an independent determinant of morbi-mortality mainly when associated with cardiomyopathy and left ventricular dysfunction.[1] LBBB due to non-ischemic cardiomyopathy is considered *** irreversibility occurs because LBBB and cardiomyopathy act in a synergic manner in order to maintain both ***,there are a few reports in the literature showing that some patients have had an improvement in cardiac function with normalization of QRS and have experienced a reverse remodelling with pharmacological therapy only.[2–4]

关键词： Desynchronization Heart failure Left bundle branch block Reverse remodelling

Investigation of WZ Sge-type Dwarf Nova ASASSN-19oc:Optical Spectroscopy and Multicolor Light Curve Analysis

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Research in Astronomy and Astrophysics 2024年第8期24卷 20-31页

作者： Viktoriia Krushevska Sergey Shugarov Paolo Ochner Yuliana Kuznyetsova Mykola Petrov Peter kroll Astronomical Institute of the Slovak Academy of Sciences Tatranska Lomnica05960 VysokéTatrySlovakia Main Astronomical Observatory of NAS of Ukraine 27 Akademika Zabolotnoho St.03143 KyivUkraine INAF—Osservatorio Astronomico di Padova Vicolo dell’Osservatorio 5I-35122 PadovaItaly Department of Physics and Astronomy University of PadovaVia F.Marzolo 8I-35131 PadovaItaly Max Planck Computing and Data Facility(MPCDF) Gießenbachstrasse 2D-85748 GarchingGermany Sonneberg Observatory Sternwartestr.32D-96515 SonnebergGermany

In this study,we present an investigation of the newly discovered dwarf nova ASASSN-19oc during its superoutburst on 2019 June *** carried out detailed UBVRcIc-photometric observations and also obtained a spectrum on day 7 of the outburst,which shows the presence of hydrogen absorption lines commonly found in dwarf nova *** of photometric data reveals the occurrence of early superhumps in the initial days of observations,followed by ordinary and late *** have accurately calculated the period of the ordinary superhumps as Pord=0.05681(10)days and determined the periods at different stages,as well as the rate of change of the superhump period(P_(dot)=(5)P/P=8.1×10^(-5)).Additionally,we have derived the mass ratio of the components(q=0.09),and estimated the color temperature during the outburst as~11,000 K,the distance to the system(d=560 pc)and absolute magnitude of the system in outburst(MV=5.3).We have shown that outbursts of this star are very rare:based on brightness measurements on 600 archival photographic plates,we found only one outburst that occurred in *** fact,as well as the properties listed above,convincingly shows that the variable ASASSN-19oc is a dwarf nova of WZ Sge type.

关键词： (stars)binaries(including multiple) close-(stars)novae-cataclysmic variables-stars dwarf novae

Paraspinous hemolymphangioma associated with adolescent scoliosis

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World Journal of Clinical Cases 2015年第6期3卷 514-518页

作者： Ishaan Swarup Benjamin T Bjerke-kroll Matthew E Cunningham Orthopaedic Surgery Hospital for Special Surgery

Lymphangiomas are a group of benign malformations of the lymphatic system, and hemolymphangioma(or hemangiolymphangioma) is a rare congenital malformation of the lymphatic system with vascular involvement. These benign malformations are most commonly diagnosed at an early age, and may be present as a part of an associated syndrome. In this case report, we describe the first case of adolescent scoliosis associated with a large, paraspinous hemolymphangioma. A 15-year-old girl with an incidental finding of a paraspinous hemolymphangioma is presented along with her history, physical exam, radiographic findings, and operative course. The possible pathogenesis, treatment approach, and clinical dilemmas are also discussed. Given the well-known relationship between tumors and scoliosis, a benign paraspinous vascular and lymphatic tumor may be responsible for the presence of scoliosis in a small number of patients.

关键词： Case report Scoliosis Etiology Hemolymphangioma Tumor