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Ripple and Uniformity Measurement of a Phased-Array Testing-Machine for round-Bar Testing

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Ripple and Uniformity Measurement of a Phased-Array Testing-...

Iron,HCV and the liver

17th World Conference on Non-Destructive Testing

作者： stephan FALTER Josef maier Ugur TEZCAN GE Inspection Technologies GmbH

＜正＞Industrial testing of round bar material is commonly carried out directly in the testing line applying automated *** the simple handling possibilities and the excellent resolution,phased-array systems,preferably of type ROWA are applied for these *** to now,many special materials with associated non-standard specifications are still tested offline in immersion tanks or even *** addition to the small reference defects applied,the testing of those materials requires am in depth understanding of the variation of the defect signal along the complete circumference of the test body,generally referred to as Ripple and *** the process point of view,it is of great advantage to transfer the offline test of special machines to the inline testing *** order to do this,a detailed measurement of the testing homogeneity under industrial conditions is one of the key *** this purpose,a method and a measurement system,which allows measuring Ripple and Uniformity,was developed and set into operation.

关键词： Phased-array ROWA Bar testing Ripple & uniformity

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World Journal of Gastroenterology 1997年第2期3卷 4-6页

作者： K.P.maier KP maier MD Department of Medicine Division of Gastroenterology City Hospital Esslingen Acad. Department of University of Tuebingen Germany.

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Ｉｒｏｎ，ＨＣＶａｎｄｔｈｅｌｉｖｅｒＫ．Ｐ．ＭａｉｅｒＳｕｂｊｅｃｔｈｅａｄｉｎｇｓＩｒｏｎ；ｈｅｐａｔｉｔｉｓＣｖｉｒｕｓ；ｌｉｖｅｒ；ｈｅｐａｔｉｔｉｓＣＩＲＯＮＩｒｏｎｓｅｒｖｅｓａｓａｎｅｓｅｎｔｉａｌｍｅｔａｌｆｏｒｔｈｅｓｕｒｖｉｖａｌ...

关键词： Hepatitis C Hepatitis C virus Iron Liver

Human iPSC-derived iMSCs improve bone regeneration in mini-pigs

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Bone Research 2019年第4期7卷 399-409页

作者： Pascal Jungbluth Lucas-Sebastian Spitzhorn Jan Grassmann stephan Tanner David Latz md Shaifur Rahman Martina Bohndorf Wasco Wruck Martin Sager Vera Grotheer Patric Kropil Mohssen Hakimi Joachim Windolf Johannes Schneppendahl James Adjaye Department of Trauma and Hand Surgery Heinrich Heine University Hospital DüsseldorfMoorenstr.540225 DüsseldorfGermany Institute for Stem Cell Research and Regenerative Medicine Medical FacultyHeinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany Animal Research Institute Heinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany Department of Diagnostic and Interventional Radiology Medical FacultyHeinrich Heine UniversityDüsseldorfMoorenstr.540225 DüsseldorfGermany Vivantes Klinikum Am Urban Dieffenbachstraβe 110967 BerlinGermany

Autologous bone marrow concentrate(BMC)and mesenchymal stem cells(MSCs)have beneficial effects on the healing of bone *** address the shortcomings associated with the use of primary MSCs,induced pluripotent stem cell(iPSC)-derived MSCs(iMSCs)have been proposed as an *** aim of this study was to investigate the bone regeneration potential of human iMSCs combined with calcium phosphate granules(CPG)in critical-size defects in the proximal tibias of mini-pigs in the early phase of bone healing compared to that of a previously reported autograft treatment and treatment with a composite made of either a combination of autologous BMC and CPG or CPG *** were derived from iPSCs originating from human fetal foreskin fibroblasts(HFFs).They were able to differentiate into osteoblasts in vitro,express a plethora of bone morphogenic proteins(BMPs)and secrete paracrine signaling-associated cytokines such as PDGF-AA and *** and histomorphometrically,HFF-iMSC+CPG transplantation resulted in significantly better osseous consolidation than the transplantation of CPG alone and produced no significantly different outcomes compared to the transplantation of autologous BMC+CPG after 6 *** results of this translational study imply that iMSCs represent a valuable future treatment option for load-bearing bone defects in humans.

关键词： healing alone treatment

Milestones in Molecular Dynamics Simulations of Single-Walled Carbon Nanotube Formation: A Brief Critical Review

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Nano Research 2009年第10期2卷 755-767页

作者： stephan Irle Yasuhito Ohta Yoshiko Okamoto Alister JPage Ying Wang Keiji Morokuma Fukui Institute for Fundamental Chemistry Kyoto UniversityKyoto 606-8103Japan Institute for Advanced Research and Department of Chemistry Nagoya UniversityNagoya 464-8602Japan Cherry L.Emerson Center for Scientic Computation and Department of Chemistry Emory UniversityAtlantaGA 30322USA Department of Chemistry Nara Women’s UniversityNara 630-8506Japan

We present a brief review of the most important efforts aimed at simulating single-walled carbon nanotube(SWNT)nucleation and growth processes using molecular dynamics(md)techniques reported in the *** simulations allow the spatio-temporal movement of atoms during nonequilibrium growth to be ***,it is hoped that a successful md simulation of the entire SWNT formation process will assist in the design of chirality-specic SWNT synthesis *** give special consideration to the role of the metal catalyst particles assumed in standard theories of SWNT formation,and describe the actual metal behavior observed in the reported md simulations,including our own recent quantum chemical md *** is concluded that the use of a quantum potential is essential for a qualitatively correct description of the catalytic behavior of the metal cluster,and that carbide formation does not seem to be a necessary requirement for nucleation and growth of SWNTs according to our most recent quantum chemical md simulations.

关键词： Carbon nanotubes transition metal catalysis molecular dynamics reactive forceelds quantum chemistry

Characterization of the tribologically relevant cover layers formed on copper in oxygen and oxygen-free conditions

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Friction 2023年第8期11卷 1505-1521页

作者： Selina RAUMEL Khemais BARIENTI Hoang-Thien LUU Nina MERKERT Folke DENCKER Florian NÜRNBERGER Hans Jürgen maier Marc Christopher WURZ Institute of Micro Production Technology Leibniz Universität HannoverGarbsen 30823Germany Institut für Werkstoffkunde(Materials Science) Leibniz Universität HannoverGarbsen 30823Germany Institute of Applied Mechanics Clausthal University of TechnologyClausthal-Zellerfeld 38678Germany

Engineering in vacuum or under a protective atmosphere permits the production of materials, wherever the absence of oxygen is an essential demand for a successful processing. However, very few studies have provided quantitative evidence of the effect of oxidized surfaces to tribological properties. In the current study on 99.99% pure copper, it is revealed that tribo-oxidation and the resulting increased abrasive wear can be suppressed by processing in an extreme high vacuum (XHV) adequate environment. The XHV adequate atmosphere was realized by using a silane-doped shielding gas (1.5 vol% SiH4 in argon). To analyse the influence of the ambient atmosphere on the tribological and mechanical properties, a ball–disk tribometer and a nanoindenter were used in air, argon, and silane-doped argon atmosphere for temperatures up to 800 ℃. Resistance measurements of the resulting coatings were carried out. To characterize the microstructures and the chemical compositions of the samples, the scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were used. The investigations have revealed a formation of η-Cu3Si in silane-doped atmosphere at 300 ℃, as well as various intermediate stages of copper silicides. At temperatures above 300 ℃, the formation of γ-Cu5Si were detected. The formation was linked to an increase in hardness from 1.95 to 5.44 GPa, while the Young’s modulus increased by 46% to 178 GPa, with the significant reduction of the wear volume by a factor of 4.5 and the suppression of further oxidation and susceptibility of chemical wear. In addition, the relevant diffusion processes were identified using molecular dynamics (md) simulations.

关键词： wear behavior tribochemical reaction oxidation behavior surface analysis molecular dynamics(md)simulation

3D-printed facet-attached microlenses for advanced photonic system assembly

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Light(Advanced Manufacturing) 2023年第2期4卷 1-17页

作者： Yilin Xu Pascal maier Mareike Trappen Philipp-Immanuel Dietrich Matthias Blaicher Rokas Jutas Achim Weber Torben Kind Colin Dankwart Jens stephan Andreas Steffan Amin Abbasi Padraic Morrissey Kamil Gradkowski Brian Kelly Peter O’Brien Wolfgang Freude Christian Koos Institute of Photonics and Quantum Electronics(IPQ) Karlsruhe Institute of Technology(KIT)Engesserstr.576131 KarlsruheGermany Institute of Microstructure Technology(IMT) KITHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Vanguard Automation GmbH Gablonzer Strasse.1076185 KarlsruheGermany ficon TEC Service GmbH Im Finigen 328832 AchimGermany II-VI Inc. Reuchlinstraße 10/1110553 BerlinGermany Photonics Research Group Ghent University-imecTechnologiepark-Zwijnaarde 126B-9052 GentBelgium Tyndall National Institute T12 R5CP CorkIreland Eblana Photonics Ltd. West Pier Business Campus3 Old Dunleary RdDún LaoghaireDublinA96 A621Ireland

Wafer-level mass production of photonic integrated circuits(PIC)has become a technological mainstay in the field of optics and photonics,enabling many novel and disrupting a wide range of existing ***,scalable photonic packaging and system assembly still represents a major challenge that often hinders commercial adoption of PIC-based ***,chip-to-chip and fiber-to-chip connections often rely on so-called active alignment techniques,where the coupling efficiency is continuously measured and optimized during the assembly *** unavoidably leads to technically complex assembly processes and high cost,thereby eliminating most of the inherent scalability advantages of PIC-based *** this paper,we demonstrate that 3D-printed facet-attached microlenses(FaML)can overcome this problem by opening an attractive path towards highly scalable photonic system assembly,relying entirely on passive assembly techniques based on industry-standard machine vision and/or simple mechanical *** can be printed with high precision to the facets of optical components using multi-photon lithography,thereby offering the possibility to shape the emitted beams by freely designed refractive or reflective ***,the emitted beams can be collimated to a comparatively large diameter that is independent of the device-specific mode fields,thereby relaxing both axial and lateral alignment ***,the FaML concept allows to insert discrete optical elements such as optical isolators into the free-space beam paths between PIC *** show the viability and the versatility of the scheme in a series of selected experiments of high technical relevance,comprising pluggable fiber-chip interfaces,the combination of PIC with discrete micro-optical elements such as polarization beam splitters,as well as coupling with ultra-low back-reflection based on non-planar beam paths that only comprise tilted optical *** on our re

关键词： Photonic integration Photonic assembly Photonic packaging Additive laser manufacturing Multi-photon lithography Facet-attached microlenses Optical alignment tolerances Fiber-chip coupling Hybrid multi-chip modules

Structure-function relationship comparison between retinal nerve fibre layer and Bruch's membrane opening-minimum rim width in glaucoma

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International Journal of Ophthalmology(English edition) 2017年第10期10卷 1534-1538页

作者： Lukas Reznicek Sophie Burzer Andrea Laubichler Ali Nasseri Chris P Lohmann Nikolaus Feucht Michael Ulbig Mathias maier Department of Ophthalmology Technical University of Munich

AIM：To evaluate and compare structural optical coherence tomography（OCT）-based parameters,such as Bruch’s membrane opening-minimum rim width（BMO-MRW）,and retinal nerve fiber layer（RNFL）thickness in glaucoma patients with visual field（VF）defects,and to correlate both to mean deviation（md）values of obtained standard achromatic perimetry（SAP）***：Patients with glaucoma and glaucomatous VF defects were enrolled in this prospective study and compared to age-matched healthy *** study participants underwent a full ophthalmic examination and VF testing with *** RNFL thickness and BMO-MRW were acquired with *** analyses between obtained global functional and global as well as sectorial structural parameters were ***：A consecutive series of 30 glaucomatous right eyes of 30 patients were included and compared to 36healthy right eyes of 36 individuals in the control *** md of values correlated significantly with global RNFL（Pearson ***：0.632,P=0.001）and global BMO-MRW（Pearson ***：0.746,P〈0.001）values in the glaucoma *** md and sectorial RNFL or BMO-MRW values correlated less *** the control group,md values did not correlate with RNFL or BMO-MRW measurements.A subgroup analysis of myopic patients（〉4 diopters）within the glaucoma group（n=6）revealed a tendency for higher correlations between md and BMO-MRW than md and RNFL ***：In a clinical setting,RNFL thickness and BMO-MRW correlate similarly with global VF sensitivity in glaucoma patients with BMO-MRW showing higher correlations in myopic glaucoma patients.

关键词： glaucoma optical coherence tomography Bruch's membrane opening-minimum rim width retinal nerve fibre layer myopia standard automated perimetry visual field defects

超声定位与体表标志定位在儿童髂腹股沟-髂腹下神经阻滞中的比较：罗哌卡因血浆浓度测定的临床指导意义

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麻醉与镇痛 2012年第3期8卷 33-37页

作者： Marion Weintraud, md Marit Lundblad, md stephan C. Kettner, md Harald Willschke, md stephan Kapral, md Per-Arne Loennqvist, md Karl Koppatz Klaus Turnheim, md Adrian Boesenberg, md Peter Marhofer, md 周洁(译) 李士通(校) Department of Anesthesia and Intensive Care Medicine Medical University of Vienna Vienna Austria epartment of Anesthesia and Intensive Care Karolinska Hospital/Astrid Lindgren Hospital Stockholm Sweden Department of Pharmacology Medical University of Vienna Vienna Austria Red Cross Children Hospital Cape Town South Africa Department of Anesthesia University Cape Town Red Cross Children Hospital Cape Town South Africa 不详

背景儿童髂腹股沟-髂腹下神经阻滞常导致血浆局部麻醉药浓度过高。超声引导能为注射局麻药提供准确的解剖定位，从而影响局麻药的血浆浓度变化。为此，我们比较了超声定位与体表标志定位下行神经阻滞对罗哌卡因血浆浓度的影响。方法在... 详细信息

背景儿童髂腹股沟-髂腹下神经阻滞常导致血浆局部麻醉药浓度过高。超声引导能为注射局麻药提供准确的解剖定位，从而影响局麻药的血浆浓度变化。为此，我们比较了超声定位与体表标志定位下行神经阻滞对罗哌卡因血浆浓度的影响。方法在全麻诱导下，将66例准备行腹股沟疝修补术的儿童随机分为两组，年龄为8个月-7岁，一组在超声定位下行髂腹股沟-髂腹下神经阻滞（n=35），另一组在体表标志定位下行髂腹股沟-髂腹下神经阻滞（n=31），均使用0．5％的罗哌卡因0．25ml／kg（1．25mg／kg），分别在给药后0、5、10、20、30分钟用高效液相色谱法测罗哌卡因的血浆浓度，观察最大血浆浓度（Cmax），达峰时间（tmax），吸收率常数（ka），在时间0分钟时血浆浓度的上升速度（dC0／d1）和曲线下面积值（AUC）。结果使用超声定位技术阻滞患儿的Cmax（sd）、ka、dC0／dt和AUC的值均高于使用标志定位技术的值，而tmax的值也短于使用标志定位技术的值。[Cmax：1．78（0．62）vs1．23（0．70）μg／ml，P〈0．01；ka：14．4（10．7）vs11．7（11．4）h^-1，P〈0．05；dC0／d1：0．26（0．12）vs0．15（0．03）μg·ml^-1·min^-1，P〈0．01；AUC：42．4（15．9）vs27．2（18．1）μg·30min^-1·ml^-1，P〈0．001；tmax：20．4（8．6）vs25．3（7．6）分钟，P〈0．05）。结论药物代谢动力学数据表明：与体表标志定位相比，在超声定位下行髂腹股沟-髂腹下神经阻滞局麻药的最大血浆浓度更高，药物吸收也更快。因此，在超声定位下行髂腹股沟-髂腹下神经阻滞时需要考虑减少局麻药的用量。

关键词：神经阻滞血浆浓度髂腹股沟超声定位罗哌卡因体表标志髂腹下临床指导

TiNiHf/SiO_(2)/Si shape memory film composites for bidirectional micro actuation

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International Journal of Smart and Nano Materials 2022年第2期13卷 293-314页

作者： Sabrina M.Curtis Marian Sielenkamper Gowtham Arivanandhan Duygu Dengiz Zixiong Li Justin Jetter Lisa Hanke Lars Bumke Eckhard Quandt stephan Wulfinghoff Manfred Kohl Institute for Materials Science Kiel University(CAU)KielGermany Materials Science and Engineering University of MarylandCollege ParkMDUnited States Institute of Microstructure Technology Karlsruhe Institute of Technology(KIT)KarlsruheGermany

The martensitic phase transformation in Ti_(40.4)Ni_(48)Hf_(11.6) shape memory alloys is leveraged for bi-directional actuation with TiNiHf/SiO_(2)/Si *** shape memory properties of magnetron sputtered Ti_(40.4)Ni_(48)Hf_(11.6) films annealed at 635℃-5 min are influenced by film thickness and the underlying *** TiNiHf film thick-ness from 21μm to 110 nm results in the reduction of all characteristic transformation temperatures until a critical thickness is ***,Ti_(40.4)Ni_(48)Hf_(11.6) thin films as low as 220 nm show transfor-mations above room temperature when deposited on SiO_(2) buffer layer,which is of great interest in *** comparison,220 nm films on Si substrates are austenitic at room temperature,and thus not suitable for *** fatigue tests on TiNiHf/SiO_(2)/Si bimorphs demonstrate better functional fatigue characteristics than freestanding films,with an average reduction of 15℃ after 125 cycles,with tempera-ture stabilization *** bi-directional actuation results are promising in the development of bistable actuators within a PMMA/TiNiHf/Si trimorph composite,whereby the additional PMMA layer undergoes a glass transition at 105℃.With the aid of constitutive modeling,a route is elaborated on how bistable actuation can be achieved at micro-to nanoscales by showing favorable thickness combinations of PMMA/TiNiHf/Si composite.

关键词： Bimorph microactuator NiTiHf bistable actuator shape memory alloy thin films