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Octave-spanning coherent supercontinuum generation in silicon on insulator from 1.06μm to beyond 2.4μm

Light(Science & Applications) 2017年第1期6卷 235-242页

作者： Neetesh Singh ming Xin Diedrik Vermeulen Katia Shtyrkova Nanxi Li Patrick T Callahan Emir salih magden Alfonso Ruocco Nicholas Fahrenkopf Christopher Baiocco Bill P-P Kuo Stojan Radic Erich Ippen Franz X Kärtner michael R Watts Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA John A.Paulson School of Engineering and Applied Science Harvard UniversityCambridgeMA 02138USA College of Nanoscale Science and Engineering SUNY Polytechnic InstituteAlbanyNY 12203USA Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92039USA Centre for Free Electron Laser Science(CFEL)-DESY and University of Hamburg Hamburg 22607Germany

Efficient complementary metal-oxide semiconductor-based nonlinear optical devices in the near-infrared are in strong *** to two-photon absorption in silicon,however,much nonlinear research is shifting towards unconventional photonics *** this work,we demonstrate the generation of an octave-spanning coherent supercontinuum in a silicon waveguide covering the spectral region from the near-to *** input pulses of 18 pJ in energy,the generated signal spans the wavelength range from the edge of the silicon transmission window,approximately 1.06 to beyond 2.4μm,with a−20 dB bandwidth covering 1.124–2.4μ*** octave-spanning supercontinuum was also observed at the energy levels as low as 4 pJ(−35 dB bandwidth).We also measured the coherence over an octave,obtaining|g_()12^(1)(λ)>90%,in good agreement with the *** addition,we demonstrate optimization of the third-order dispersion of the waveguide to strengthen the dispersive wave and discuss the advantage of having a soliton at the long wavelength edge of an octave-spanning signal for nonlinear *** research paves the way for applications,such as chip-scale precision spectroscopy,optical coherence tomography,optical frequency metrology,frequency synthesis and wide-band wavelength division multiplexing in the telecom window.

关键词： coherence integrated photonics silicon supercontinuum

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Three-Point Bending Test and Crack Detection by Acoustic Emission on Different Spring Steel Wires with Different Crystallographic Textures

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材料科学与工程（中英文A版） 2023年第3期13卷 53-67页

作者： mathias Lorenz mohammed salih Daniela Schwerdt Nowfal Al-Hamdany Emad maawad Norbert Schell Eckehard müller University of Wismar Faculty of Mechanical EngineeringPh.-Müller-Straße 14Wismar D-23966Germany Helmholtz Zentrum Hereon Institute of Materials MechanicsDepartment of Laser Processing and Structural AssessmentMax-Planck Str.1Geestacht D-21502Germany Helmholtz Zentrum Hereon Institute of Materials PhysicsMax-Planck-Str.1Geesthacht D-21502Germany Hochschule Bochum Department of Mechatronics and Mechanical EngineeringAm Hochschulcampus 1Bochum D-44801Germany Steinbeis-Transfercenter of Springtechnology Part behaviour und ProcessLangerfeldstr.53 cIserlohn D-58638Germany

In the production of compression springs,high forming velocities and grades of deformation during winding and setting may induce cracks that can lead to failure causing risks of an accident and *** AE(acoustic emission)technology,a non-destructive monitoring method,can detect acoustic signals reflected from *** establish this method in the production of technical springs,it was necessary,to find out whether the AE signal is influenced by material properties,phase fractions distribution from tempered martensite,retained austenite,and microstructure including crystallographic *** addition,it was investigated to what extent the detected AE signal can be useful to separate between an actual crack and other material *** an in-situ three-point bending test with the AE technology,macro-and micro-crack-typical AE signals were detected for five different spring steel wires(SH,VDSiCr,and FDSiCr according to EN-10270-1 and EN-10270-2).The relative energy related to the initiation,propagation,and growth of cracks caused by mechanical stress was measured using a piezoelectric *** a crack AE signal appeared for the first time,the bending tests were stopped *** results show that the frequency spectrum combined with the intensity of the acoustic signals generated during crack growth depends on the material properties and the crystallographic ***,it could be shown that it is possible to differentiate between micro-crack-typical AE signals and other signals that result from different material responses.

关键词： Technical springs AE analysis micro-computer tomography texture

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根除幽门螺杆菌对胃组织学严重程度的影响:一项随访研究

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世界核心医学期刊文摘（胃肠病学分册） 2006年第2期2卷 11-11页

作者： salih B.A. Abasiyanik m.F. Saribasak H. 赵天智 Fatih University Faculty of Science Department of Biology/Microbiology Unit B. Cekmece Istanbul Turkey Dr.

Helicobacter pylori genetic diversity and geographic distribution affect the severity of gastric histology; while eradication heals gastritis, the improvement of atrophy and intestinal metaplasia (Im) is still controversial. We investigated whether H. pylori infection and genotypes (cagA- vacA) influence the histological changes and whether eradication resolves these changes. Twenty- one patients (11 duodenal ulcer, 2 gastric ulcer, 8 gastritis) received treatment. Biopsies for CLO, PCR, histology, and culture were collected before and at 1 and 12 months after treatment, and serum samples at 0, 1, 2, 6, and 12 months. H. pylori eradication was achieved in 71% of the patients. Histological scores for H. pylori densities were significantly higher in the antrum and incisura angularis. Scores for mononuclear cell and neutrophil infiltration were significantly higher in regions with a high H. pylori density and improved progressively after eradication. Eight patients with atrophy including five with Im showed no significant changes 12 months after eradication. The cagA gene, detected in 13 (62% ), the vacA- s1a gene, in 20 (95% ), and the vacA- m1 gene, in 12 (57% ) of 21 patients were significantly associated with duodenal ulcer. A gradual decline in antibody titer reached an average of 67% 12 months after eradication. H. pylori infection and the associated genotypes (cagA of Western type) affect the severity of the gastric histology (mild forms of atrophy and Im) and the disease outcome. Eradication of H. pyloriresulted in healing of gastritis, but with no significant improvement in atrophy or Im.

关键词：胃组织随访研究肠化生 vacA 胃黏膜萎缩中性粒细胞浸润组织学检查组织学评分细胞培养活

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