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Dynamic Uniaxial Compressive Tests on Limestone

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Journal of Geological Resource and Engineering 2020年第4期8卷 121-132页

作者： Ajay Kumar Jha BioID gmbh Nürnberg 90489Germany

The dynamic properties of limestone play a pivotal role while selecting the suitable explosives for any limestone *** the application of explosives creates dynamic loading and is a dynamic event,the determination of dynamic modulus values is technically more appropriate than the static *** rock fragmentation would significantly improve by investigating the dynamic uniaxial compressive strength as specific fracture energy,stress intensity factor,fracture toughness of any detonating blast hole depend heavily on dynamic rock property and not on static rock *** of the limestone projects globally are still accustomed with using static compressive strength to understand the rock *** present papers deal with determination of dynamic uniaxial compressive property using split Hopkinson pressure bar(SHPB)*** nano second high speed camera with laser captures the crack surface opening velocity during dynamic *** was observed during data analysis that dynamic compressive strength of limestone increases by 1.7-4.9 times of the static *** may be concluded by the study that determination of dynamic compressive strength is paramount for understanding the rock fragmentation.

关键词： Rock fragmentation SHPB dynamic compressive strength

Dynamic Uniaxial Tensile Strength Tests on Limestone

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Journal of Geological Resource and Engineering 2020年第5期8卷 172-183页

作者： Ajay Kumar Jha BioID gmbh Nürnberg 90489Germany

Dynamic properties of limestone govern the rock fragmentation *** of rock under tension is more likely as compared to failure under compression under static or dynamic loading *** the application of explosives creates dynamic loading and is a dynamic event,the determination of dynamic modulus values is technically more appropriate than the static *** rock fragmentation would significantly improve by investigating the dynamic uniaxial tensile strength as specific fracture energy,stress intensity factor,fracture toughness of any detonating blast hole depend heavily on dynamic rock property and not on static rock *** of the limestone projects globally are still accustomed with using static tensile strength to understand the rock *** present papers deal with determination of dynamic uniaxial tensile property using split Hopkinson pressure bar(SHPB)*** nano second high speed camera with laser captures the crack surface opening velocity during dynamic *** was observed during data analysis that dynamic tensile strength of limestone increases by 1.2-2.3 times of the static *** may be concluded by the study that determination of dynamic tensile strength is paramount for understanding the rock fragmentation.

关键词： Rock fragmentation SHPB dynamic tensile strength

Improving thermal efficiency and stability of laser welding process for magnesium alloy by combining power modulation and subatmospheric pressure environment

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Journal of Magnesium and Alloys 2022年第10期10卷 2788-2800页

作者： Jie Ning Suck-Joo Na Lin-Jie Zhang Xiang Wang Jian Long Won-Ik Cho State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China BIAS-Bremer Institut für angewandte Strahltechnik gmbh Klagenfurter Straße 528359 BremenGermany

The laser welding(LW)process of highly reflective materials presents low thermal efficiency and poor *** solve the problem,the effects of subatmospheric environment on LW process,technological parameters in subatmospheric environment on weld formation and welding with sinusoidal modulation of laser power on the stability of LW process in subatmospheric environment were *** AZ31magnesium(Mg)alloy was used as the test *** test result revealed that the weld penetration in subatmospheric environment can increase by more than ten times compared with that under normal *** the keyhole depth greatly rises,significantly periodic local bulge is observed on the backwall surface of the keyhole and the position of the bulge shifts along the direction of the keyhole ***,the hump-shaped surface morphology of the welded seam is formed;moreover,the weld width in local zones in the lower part of the welded seam remarkably *** LW in subatmospheric environment,the weld penetration can be further greatly increased through power ***,power modulation can inhibit the occurrence of bulges in local zones on the backwall of the keyhole during LW in subatmospheric environment,thus further curbing the significant growth of the weld widths of hump-shaped welding beads and local zones in the lower part of welded ***,the mechanism of synchronously improving the thermal efficiency and stability of LW process of highly reflective materials through power modulation in subatmospheric environment was *** was conducted according to theoretical analysis of recoil pressure and observation results of dynamic behaviors of laser induced plasma clouds and keyholes in the molten pool through high speed photography.

关键词： laser welding Subatmospheric environment Power modulation Highly reflective materials Thermal efficiency Stability

Deep learning-based prediction of 3-dimensional silver contact shapes enabling improved quality control in solar cell metallization

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Energy and AI

Energy and AI 2024年第3期17卷 513-524页

作者： Marius Singler Akshay Patil Linda Ney Andreas Lorenz Sebastian Tepner Florian Clement Fraunhofer Institute for Solar Energy Systems(ISE) Heidenhofstr.279110 FreiburgGermany EKRA Automatisierungstechnik gmbh Zeppelinstraße 1674357 BonnigheimGermany

The industrial metallization of Si solar cells predominantly relies on screen printing,with silver as the preferred electrode ***,the design of commercial screens often leads to suboptimal silver usage and increased electrical resistance due to print-related inhomogeneities like mesh marks,constrictions and ***-time monitoring of quality parameters during production has thus become increasingly *** inline optical quality control systems usually only include 2D visualizations of the printed layout,which limits their effectiveness in quality *** that allow 3D measurements are usually slow,expensive,and therefore not worth considering in most *** research focuses on the development of a model that can estimate the three-dimensional shape of printed contact fingers from a single 2D image without the need of additional hardware using deep ***,a workflow for the generation of training data,which involves the creation of image pairs from a 2D microscope and a 3D confocal laser scanning microscope(CLSM)to accurately represent solar cell fingers,is *** model training,the predicted height maps are compared with the ground truth height maps,and the robustness of the model with respect to a paste variation and screen parameter variation is *** results confirm the feasibility and reliability of deep learning-based 3D shape estimation,extending its applicability to new,previously unseen data from screen-printed contact *** a structural similarity index(SSIM)score of 0.76,a strong correlation between the estimated and ground truth height maps is *** summary,our deep learning-based approach for height map estimation offers an effective and reliable solution for fast inline detection and analysis of the cross-sectional area of the printed contact fingers.

关键词： Deep Learning Front-side metallization Image2Heigth Solar cell Screen-printing

High-aspect-ratio nanoimprint process chains

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Microsystems & Nanoengineering 2017年第1期3卷 221-232页

作者： Víctor J.Cadarso Nachiappan Chidambaram Loïc Jacot-Descombes Helmut Schift Laboratory for Micro-and Nanotechnology Research Division Synchrotron Radiation and NanotechnologyPaul Scherrer InstitutVilligen 5232Switzerland Micro Resist Technology gmbh Köpenicker Straße 325Berlin 12555Germany

Different methods capable of developing complex structures and building elements with high-aspect-ratio nanostructures combined with microstructures,which are of interest in nanophotonics,are *** originals for subsequent replication steps,two families of masters were developed:(i)3.2μm deep,180 nm wide trenches were fabricated by silicon cryo-etching and(ii)9.8μm high,350 nm wide ridges were fabricated using 2-photon polymerization direct laser *** emerging technologies enable the vertical smooth sidewalls needed for a successful imprint into thin layers of polymers with aspect ratios exceeding *** with high aspect ratios of up to 28 and no residual layer were produced in Ormocers using the micromoulding into capillaries(MIMIC)process with subsequent *** work presents and balances the different fabrication routes and the subsequent generation of working tools from masters with inverted tones and the combination of hard and soft *** provides these techniques with a proof of concept for their compatibility with high volume manufacturing of complex micro-and nanostructures.

关键词： cryo-etching direct 6 write laser lithography high aspect ratio moulding nanoimprint lithography Ormocer photonic nanofences 2-photon polymerization

A Compact 532-nm Source by Frequency Doubling of a Diode Stack End-Pumped Nd：YAG Slab laser

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Chinese Physics Letters 2007年第10期24卷 2846-2848页

作者：张恒利刘晓萌李代军石鹏 Alex Schell Claus Riidige Haas Du Ke-Ming Department of Physical Electronics School of Information Science and Technology Beijing Institute of Technology Beijing 100081 Department of Physics Tsinghua University Beijing 100084 EdgeWave gmbh Schumanstr.18B D-52146 Wuerselen Germany

A near-diffraction-limited green source is generated at 1 kHz repetition rate by frequency doubling of a diode stack end-pumped electro-optically Q-switched Nd：YAG slab laser. We obtain 9. 7mJ green light with pulse width of 12.2ns at a repetition rates of i kHz. The pump to green optical conversion efficiency is 12.9%. The energy pulse stability at 532nm is about 0.8%.

关键词： coated conductor buffer layer self-epitaxy CeO2

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铺层铺叠工艺现状

航空制造技术 2010年第6期53卷 62-62页

作者： Axel Rieckmann 王文贵(翻译) LAP gmbh laser Applikationen 不详

LAP公司CAD-PRO系列的激光投影设备为航空、船舶、风力发电等行业的碳纤维或剥离纤维增强复合材料构件制造过程中的铺层和元件定位提供了有效工具。

关键词：铺层工艺复合材料构件 PRO系列投影设备有效工具制造过程纤维增强

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奥地利的高科技针刺——脑循环研究(英文)

中西医结合学报 2012年第4期10卷 362-368页

作者： Gerhard Litscher Stronach Research Unit for Complementary and Integrative laser Medicine Research Unit of Biomedical Engineering in Anesthesia and Intensive Care Medicineand TCM Research Center GrazMedical University of GrazGrazAustria

在奥地利,有众多结合医学研究特别是中医学的研究机构,开展了大量相关研究。最近15年来,高科技针刺的研究在奥地利格拉茨医科大学取得了重要的发展。本文介绍了高科技针刺与脑循环和经颅多普勒超声检查(transcranial Doppler,TCD)。TCD... 详细信息

在奥地利,有众多结合医学研究特别是中医学的研究机构,开展了大量相关研究。最近15年来,高科技针刺的研究在奥地利格拉茨医科大学取得了重要的发展。本文介绍了高科技针刺与脑循环和经颅多普勒超声检查(transcranial Doppler,TCD)。TCD很早就被用于各种基础和临床研究,近10年来被广泛用于衡量各种针刺疗法的疗效。根据多普勒的原理,超声波通过作用于给脑部供血的血管获取针刺引起的脑部血流动力学变化的信息。本文介绍了与针刺相关的TCD技术的基本概念,以及针刺刺激对脑部血流动力学的特异性影响。

关键词：激光针刺奥地利脑血管循环超声检查血流速度激光多普勒流量测定综述

Model for a UV laser Based Local Polymer Surface Halogenation Process Using a Gaseous Precursor

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Modeling and Numerical Simulation of Material Science 2014年第1期4卷 14-19页

作者： Simon Kibben BIAS—Bremer Institut für Angewandte Strahltechnik gmbh Bremen Germany

An analytical model describing the physical relations of a UV-based process for halogenation of polymeric surfaces is presented. The process allows, depending on the parameters, a local halogenation with sharp edges at the interfaces to areas where no halogenation is desired. This is achieved via a nonreactive halogen-containing gaseous precursor and a UV source providing photons which dissociate the precursor photolytically. Thus, only where the UV photons affect the precursor, halogens are generated and the polymer is being halogenated.

关键词： Local Surface Halogenation Polymer Modification UV-laser-Based Surface Modification