检索结果-南通市图书馆

Deep learning in nano-photonics:inverse design and beyond

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2021年第5期9卷 I0015-I0033页

作者： peter R.WIECHA ARNAUD ARBOUET christian GIRARD OTTO L.MUSKENS LAAS Universitéde ToulouseCNRSToulouseFrance CEMES Universitéde ToulouseCNRSToulouseFrance Physics and Astronomy Faculty of Engineering and Physical SciencesUniversity of SouthamptonSouthamptonUK

Deep learning in the context of nano-photonics is mostly discussed in terms of its potential for inverse design of photonic devices or nano-structures. Many of the recent works on machine-learning inverse design are highly specific, and the drawbacks of the respective approaches are often not immediately clear. In this review we want therefore to provide a critical review on the capabilities of deep learning for inverse design and the progress which has been made so far. We classify the different deep-learning-based inverse design approaches at a higher level as well as by the context of their respective applications and critically discuss their strengths and weaknesses. While a significant part of the community’s attention lies on nano-photonic inverse design, deep learning has evolved as a tool for a large variety of applications. The second part of the review will focus therefore on machine learning research in nano-photonics "beyond inverse design." This spans from physics-informed neural networks for tremendous acceleration of photonics simulations, over sparse data reconstruction, imaging and "knowledge discovery" to experimental applications.

关键词： inverse beyond learning

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

在线全文

学校读者我要写书评

暂无评论

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

On the combined effect of soil fertility and topography on tree growth in subtropical forest ecosystems—a study from SE China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2017年第1期10卷 111-127页

作者： Thomas Scholten Philipp Goebes peter Kühn Steffen Seitz Thorsten Assmann Jürgen Bauhus Helge Bruelheide Francois Buscot Alexandra Erfmeier Markus Fischer Werner Härdtle Jin-Sheng He Keping Ma Pascal A.Niklaus Michael Scherer-Lorenzen Bernhard Schmid Xuezheng Shi Zhengshan Song Goddert von Oheimb christian Wirth Tesfaye Wubet Karsten Schmidt Department of Geosciences Soil Science and GeomorphologyUniversity of TübingenRümelinstraße 19-2372070 TübingenGermany Institute of Ecology Leuphana University LüneburgScharnhorststr.121335 LüneburgGermany Faculty of Forest and Environmental Sciences SilvicultureUniversity of FreiburgTennenbacherstraße 479085 Freiburg im BreisgauGermany Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle WittenbergAm Kirchtor 106108 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5e04103 LeipzigGermany Helmholtz Centre for Environmental Research UFZ Theodor-Lieser-Straße 406120 HalleGermany Department of Plant Sciences University of BernAltenbergrain 213013 BernSwitzerland Peking University No.5 Yiheyuan RoadHaidian DistrictBeijing 100871China Institute of Botany Chinese Academy of SciencesNo.20 NanxincunXiangshanBeijing 100093China Institute of Evolutionary Biology and Environmental Studies University of ZürichWinterthurerstrasse 1908057 ZürichSwitzerland Faculty of Biology Department of GeobotanyUniversity of FreiburgSchänzlestraße 179104 FreiburgGermany Institute of Soil Science Chinese Academy of SciencesNo.71 East Beijing RoadNanjingChina TU Dresden Biodiversity and Nature ConservationPienner Straße 701737 TharandtGermany Department of Systematic Botany and Functional Biodiversity University of LeipzigJohannisallee 2104103 LeipzigGermany

Aims The aim of our research was to understand small-scale effects of topography and soil fertility on tree growth in a forest biodiversity and ecosystem functioning(BEF)experiment in subtropical SE *** Geomorphometric terrain analyses were carried out at a spatial resolution of 5×5 *** samples of different depth increments and data on tree height were collected from a total of 566 plots(667 m2 each).The soils were analyzed for carbon(soil organic carbon[SOC]),nitrogen,acidity,cation exchange capacity(CEC),exchangeable cations and base saturation as soil fertility *** plots were classified into geomorphological *** of variance and linear regressions were applied to all terrain,soil fertility and tree growth *** Findings In general,young and shallow soils and relatively small differences in stable soil properties suggest that soil erosion has truncated the soils to a large extent over the whole area of the *** explains the concurrently increasing CEC and SOC stocks downslope,in hollows and in ***,colluvial,carbon-rich sediments are missing widely due to the convexity of the footslopes caused by uplift and removal of eroded sediments by adjacent *** results showed that soil fertility is mainly influenced by ***-Carlo flow accumulation(MCCA),curvature,slope and aspect significantly affected soil ***,soil fertility was affected by the different geomorphological positions on the experimental sites with ridge and spur positions showing lower exchangeable base cation contents,especially potassium(K),due to *** geomorphological effect of soil fertility is most pronounced in the topsoil and decreases when considering the subsoil down to 50 cm *** soil fertility attributes affect tree height after 1-2 years of growth,among which C stocks proved to be most important while pH_(KCl)and CEC only played minor ***,soil acidity and a hig

关键词： soil fertility topography soil erosion matter transport biodiversity DSM carbon stocks tree forest BEF-China China

软启动——降低三相异步电动机的启动电流与启动转矩的峰值

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代制造 2003年第27期 60-65页

作者： peter F.Brosch Chen Min christian Mnnink 德国汉诺威应用科学技术大学

此实验是在德国汉诺威应用科学技术大学完成的,考虑到我国现有的电网在供电稳定性与供电质量上与发达国家尚存在差距,因此将此文翻译发表,希望能够起到一定的参考作用。

关键词：三相异步电动机启动电流启动转矩峰值软启动

在线全文

学校读者我要写书评

暂无评论

家族企业要行使好所有权

中外管理 2010年第7期 68-69页

作者： christian Caspar Ana Karina Dias Heinz-peter Elstrodt

那些能够延续三代或三代以上的家族企业,往往比其他同类企业更具竞争力。＂家族＂的两个难题家族企业往往是一种被忽略的所有制形式。然而,家族企业无所不在：从社区周围的夫妻店,到数百万支撑众多经济体的中小型企业,再到宝马、三星和... 详细信息

那些能够延续三代或三代以上的家族企业,往往比其他同类企业更具竞争力。＂家族＂的两个难题家族企业往往是一种被忽略的所有制形式。然而,家族企业无所不在：从社区周围的夫妻店,到数百万支撑众多经济体的中小型企业,再到宝马、三星和沃尔玛等家喻户晓的巨头,到处都能见到家族企业的身影。

关键词：家族企业所有权所有制形式中小型企业竞争力夫妻店经济体沃尔玛

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

家族式企业经久不衰的五大特征

当代经理人 2010年第4期 43-46页

作者： christian Caspar Ana Karina Dias Heinz-peter Elstrodt 麦肯锡苏黎世分公司麦肯锡圣保罗分公司

家族式企业往往是一种被忽略的所有制形式。然而，家族式企业无所不在：从社区周围的夫妻店，到数百万支撑众多经济体的中小型企业，再到宝马、三星和沃尔玛等家喻户晓的巨头，到处都能见到家族式企业的身影。在标普500指数所涉及的全... 详细信息

家族式企业往往是一种被忽略的所有制形式。然而，家族式企业无所不在：从社区周围的夫妻店，到数百万支撑众多经济体的中小型企业，再到宝马、三星和沃尔玛等家喻户晓的巨头，到处都能见到家族式企业的身影。在标普500指数所涉及的全部企业中，有1／3是家族式企业；在法国和德国的250家最大型企业中，有40％为家族式企业。所谓家族式企业，就是一个家族拥有企业的大多数股份，可以影响企业的各种重大决策，尤其是董事长和首席执行官的选举。

关键词：家族式企业所有制形式中小型企业首席执行官大型企业夫妻店经济体沃尔玛

在线全文

学校读者我要写书评

暂无评论

家族企业基业长青的五大特征

商学院 2010年第4期 70-73页

作者： christian Caspar Ana Karina Dias Heina-peter Elstrodt 麦肯锡苏黎世分公司麦肯锡圣保罗分公司

接受美国国会质询时，丰田章男说道：“每一辆丰田汽车上都有我的名字。车辆受损时，就像我也受到了伤害一样。”作为丰田创始人丰田喜一郎的孙子。丰田章男绝不会愿意把这份超过70年的家业葬送在自己手里。

关键词：家族企业丰田汽车丰田喜一郎美国国会创始人上都车辆

National Forest Inventories capture the multifunctionality of managed forests in Germany

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystems 2021年第1期8卷 50-68页

作者： Nadja K.Simons María R.Felipe-Lucia peter Schall christian Ammer Jürgen Bauhus Nico Blüthgen Steffen Boch François Buscot Markus Fischer Kezia Goldmann Martin M.Gossner Falk Hänsel Kirsten Jung peter Manning Thomas Nauss Yvonne Oelmann Rodica Pena Andrea Polle Swen C.Renner Michael Schloter Ingo Schöning Ernst-Detlef Schulze Emily F.Solly Elisabeth Sorkau Barbara Stempfhuber Tesfaye Wubet Jörg Müller Sebastian Seibold Wolfgang W.Weisser Terrestrial Ecology Research Group Technische Universität MünchenHans-Carl-von-Carlowitz-Platz 285354 FreisingGermany Present address:Ecological Networks Technische Universität DarmstadtSchnittspahnstraße 364287 DarmstadtGermany Helmholtz Centre for Environmental Research-UFZ Department of Ecosystem ServicesDeutscher Platz 5e04103 LeipzigGermany Present address:German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5e04103 LeipzigGermany Silviculture and Forest Ecology of the Temperate Zones University of GöttingenBüsgenweg 137077 GöttingenGermany Centre for Biodiversity and Sustainable Land-use University of GöttingenBüsgenweg 137073 GöttingenGermany Chair of Silviculture Faculty of Environment and Natural ResourcesUniversity of FreiburgTennenbacherstr.479106 FreiburgGermany Ecological Networks Technische Universität DarmstadtSchnittspahnstraße 364287 DarmstadtGermany Institute of Plant Sciences University of BernAltenbergrain 213013 BernSwitzerland Biodiversity and Conservation Biology WSL Swiss Federal Research InstituteZürcherstrasse 1118903 BirmensdorfSwitzerland Helmholtz Centre for Environmental Research-UFZ Department of Soil EcologyTheodor-Lieser-Straße 406120 Halle(Saale)Germany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5e04103 LeipzigGermany Forest Entomology WSL Swiss Federal Research InstituteZürcherstrasse 1118903 BirmensdorfSwitzerland Department of Environmental Systems Science Institute of Terrestrial EcosystemsETH ZürichUniversitätstr 168092 ZürichSwitzerland Environmental Informatics University of MarburgDeutschhausstraße 1235032 MarburgGermany Evolutionary Ecology and Conservation Genomics Ulm UniversityAlbert-Einstein-Allee 1189069 UlmGermany Senckenberg Biodiversity and Climate Research Centre Senckenberganlage 2560325 Frankfurt am MainGermany Geoecology University of TübingenRümelinstraße 19-2372070 TübingenGermany Present address:Department of Sustaina

Background:Forests perform various important ecosystem functions that contribute to ecosystem *** many parts of the world,forest management has shifted from a focus on timber production to multi-purpose forestry,combining timber production with the supply of other forest ecosystem ***,it is unclear which forest types provide which ecosystem services and to what extent forests primarily managed for timber already supply multiple ecosystem *** on a comprehensive dataset collected across 150 forest plots in three regions differing in management intensity and species composition,we develop models to predict the potential supply of 13 ecosystem *** use those models to assess the level of multifunctionality of managed forests at the national level using national forest inventory ***:Looking at the potential supply of ecosystem services,we found trade-offs(*** both bark beetle control or dung decomposition and both productivity or soil carbon stocks)as well as synergies(*** temperature regulation,carbon storage and culturally interesting plants)across the 53 most dominant forest types in *** single forest type provided all ecosystem services *** ecosystem services showed comparable levels across forest types(*** or richness of saprotrophs),while others varied strongly,depending on forest structural attributes(*** availability or cover of edible plants)or tree species composition(*** nitrification activity).Variability in potential supply of ecosystem services was only to a lesser extent driven by environmental ***,the geographic variation in ecosystem function supply across Germany was closely linked with the distribution of main tree ***:Our results show that forest multifunctionality is limited to subsets of ecosystem *** importance of tree species composition highlights that a lack of multifunctionality at the stand lev

关键词： Ecosystem processes and services Forest management Structural diversity Tree species composition Trade-offs and synergies Forest productivity

在线全文

学校读者我要写书评

暂无评论

家族式企业经久不衰的五大特征

商学院 2012年第11期 I0047-I0050页

作者： christian Caspar Ana Karina Dias Heinz-peter Elstrodt 麦肯锡苏黎世分公司麦肯锡圣保罗分公司

家族式企业要做到经久不衰，关键是要采用专业的管理模式，并努力使家族能始终保持企业主的地位。家族式企业往往是一种被忽略的所有制形式。然而，家族式企业无所不在：从社区周围的夫妻店，到数百万支撑众多经济体的中小型企业，再到... 详细信息

家族式企业要做到经久不衰，关键是要采用专业的管理模式，并努力使家族能始终保持企业主的地位。家族式企业往往是一种被忽略的所有制形式。然而，家族式企业无所不在：从社区周围的夫妻店，到数百万支撑众多经济体的中小型企业，再到宝马、三星和沃尔玛等家喻户晓的巨头，到处都能见到家族式企业的身影。在标普500指数所涉及的全部企业中，

关键词：家族式企业所有制形式中小型企业管理模式企业主夫妻店经济体沃尔玛