检索结果-南通市图书馆

德语学习 2010年第4期 4-5页

作者： gottfried benn

两个梦。第一个问我：你现在是什么表情：在慢慢变暗的光线中你斗胆在哭着说些什么？

关键词：德语语法语言学翻译方法

在线全文

学校读者我要写书评

暂无评论

紫菀花

德语学习 2005年第4期 1-1页

作者： gottfried benn 欧凡

在线全文

学校读者我要写书评

暂无评论

在一个夜晚

德语人文研究 2001年第5期 1-1页

作者：谢莹莹 gottfried benn

Aerodynamic Cost of Flapping

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2015年第1期12卷 61-69页

作者： gottfried Sachs Institute of Flight System Dynamics Technische Universitat München Boltzmannstr. 15 85748 Garching Germany

A new modeling approach is presented for mathematically describing the drag due to wing flapping. It is shown that there is an aerodynamic cost of flapping in terms of an increase in the drag when compared with non-flapping. The drag increase con- cerns the induced drag which results from lift generation. There are two effects that yield the induced drag increase caused by flapping. The first effect is due to changes in the direction of the lift vectors at the left and right wings during the flapping cycle by tilting them according to the flapping angle of the wings. Because of tilting the lift vectors, more lift has to be generated than is required for the vertical force balance in flapping flight. This lift enlargement causes an increase of the induced drag. The second effect that increases the induced drag is due to changes in the magnitude of the lift vector in the course of the flapping cycle. Changes in the magnitude of the lift vector are necessary for generating thrust which is required for the longitudinal force balance. As a result, both effects of lift vector changes cause a drag increase when compared with non-flapping. Solutions on an analytical basis and as well as results using a computational fluid dynamics method are presented.

关键词： wing flapping induced drag lift vector tilting lift vector magnitude change

Advanced mid-infrared plasmonic waveguides for on-chip integrated photonics

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 2023年第10期11卷 1694-1702页

作者： MAURO DAVID DAVIDE DISNAN ELENA ARIGLIANI ANNA LARDSCHNEIDER GEORG MARSCHICK HANH T.HOANG HERMANN DETZ BERNHARD LENDL ULRICH SCHMID gottfried STRASSER BORISLAV HINKOV Institute of Solid State Electronics and Center for Micro-and Nanostructures TU WienViennaAustria Institute of Sensor and Actuator Systems TU WienViennaAustria Central European Institute of Technology Brno University of TechnologyBrnoCzech Republic Institute of Chemical Technologies and Analytics ViennaAustria

Long-wave infrared(LWIR, 8–14 μm) photonics is a rapidly growing research field within the mid-IR with applications in molecular spectroscopy and optical free-space communication. LWIR applications are often addressed using rather bulky tabletop-sized free-space optical systems, preventing advanced photonic applications,such as rapid-time-scale experiments. Here, device miniaturization into photonic integrated circuits(PICs) with maintained optical capabilities is key to revolutionize mid-IR photonics. Subwavelength mode confinement in plasmonic structures enabled such miniaturization approaches in the visible-to-near-IR spectral range. However,adopting plasmonics for the LWIR needs suitable low-loss and-dispersion materials with compatible integration strategies to existing mid-IR technology. In this paper, we further unlock the field of LWIR/mid-IR PICs by combining photolithographic patterning of organic polymers with dielectric-loaded surface plasmon polariton(DLSPP) waveguides. In particular, polyethylene shows favorable optical properties, including low refractive index and broad transparency between ~2 μm and 200 μm. We investigate the whole value chain, including design, fabrication, and characterization of polyethylene-based DLSPP waveguides and demonstrate their first-time plasmonic operation and mode guiding capabilities along S-bend structures. Low bending losses of ~1.3 d B and straight-section propagation lengths of ~1 mm, pave the way for unprecedented complex on-chip mid-IR photonic devices. Moreover, DLSPPs allow full control of the mode parameters(propagation length and guiding capabilities) for precisely addressing advanced sensing and telecommunication applications with chip-scale devices.

关键词： waveguides transparency straight

On the relationship between plant species diversity and genetic diversity of Plantago lanceolata(Plantaginaceae)within and between grassland communities

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2010年第1期3卷 41-48页

作者： Nidal Odat Frank H.Hellwig gottfried Jetschke Markus Fischer Institute of Ecology Friedrich-Schiller-UniversityDornburger Straße 15907743 JenaGermany Department of Biology Al-Hussein Bin Talal UniversityPO Box 20Ma’anJordan Institute of Systematic Botany Friedrich-Schiller-UniversityPhilosophenweg 16D-07743 JenaGermany Institute of Plant Sciences University of BernAltenbergrain 21CH-3013 BernSwitzerland

Aims and Methods The relationship between genetic diversity and species diversity and the underlying mechanisms are of both fundamental and applied *** used amplified fragment length polymorphism(AFLP)and vegetation records to investigate the association between genetic diversity of Plantago lanceolata and plant species diversity using 15 grassland communities in central *** used correlation and partial correlation analyses to examine whether relationships between genetic and species diversity were direct or mediated by environmental differences between *** Findings Both within-and between-population genetic diversity of *** were significantly positively correlated with plant species diversity within and between *** and partial correlations revealed that the positive correlations indirectly resulted from the effects of abiotic habitat characteristics on plant species diversity and,via abundance,on genetic diversity of ***,they did not reflect a direct causal relationship between plant species diversity and genetic diversity of ***,as would have been expected based on the hypothesis of a positive relationship between plant species diversity and niche diversity.

关键词： diversity biodiversity conservation ecological niche genetic diversity species richness

Understanding satellite images:a data mining module for Sentinel images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Big Earth Data 2020年第4期4卷 367-408页

作者： Corneliu Octavian Dumitru gottfried Schwarz Anna Pulak-Siwiec Bartosz Kulawik Mohanad Albughdadi Jose Lorenzo Mihai Datcu Remote Sensing Technology Institute(IMF) Earth Observation Center(EOC)German Aerospace Center(DLR)WeβingGermany SmallGIS KrakowPoland Terranis Ramonville France ATOS SPAIN SA MadridSpain

The increased number of free and open Sentinel satellite images has led to new applications of these *** them is the systematic classification of land cover/use types based on patterns of settlements or agriculture recorded by these images,in particular,the identification and quantification of their temporal *** this paper,we will present guidelines and practical examples of how to obtain rapid and reliable image patch labelling results and their validation based on data mining techniques for detecting these temporal changes,and presenting these as classification maps and/or statistical *** represents a new systematic validation approach for semantic image content *** will focus on a number of different scenarios proposed by the user community using Sentinel *** a large number of potential use cases,we selected three main cases,namely forest monitoring,flood monitoring,and macro-economics/urban monitoring.

关键词： Data mining Earth observation Sentinel-1 Sentinel-2 image semantics classification maps analytics third party mission data

The digital Earth Observation Librarian:a data mining approach for large satellite images archives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Big Earth Data 2020年第3期4卷 265-294页

作者： Mihai Datcu Alexandru-Cosmin Grivei Daniela Espinoza-Molina Corneliu Octavian Dumitru Christoph Reck Vlad Manilici gottfried Schwarz German Aerospace Center Remote Sensing Technology InstituteWesslingGermany Research Center for Spatial Information University Politehnica of BucharestBucharestRomania German Remote Sensing Data Center German Aerospace CenterWesslingGermany

Throughout the years,various Earth Observation(EO)satellites have generated huge amounts of *** extraction of latent information in the data repositories is not a trivial *** methodologies and tools,being capable of handling the size,complexity and variety of data,are *** scientists require support for the data manipulation,labeling and information extraction *** paper presents our Earth Observation Image Librarian(EOLib),a modular software framework which offers innovative image data mining capabilities for TerraSAR-X and EO image data,in *** main goal of EOLib is to reduce the time needed to bring information to end-users from Payload Ground Segments(PGS).EOLib is composed of several modules which offer functionalities such as data ingestion,feature extraction from SAR(Synthetic Aperture Radar)data,meta-data extraction,semantic definition of the image content through machine learning and data mining methods,advanced querying of the image archives based on content,meta-data and semantic categories,as well as 3-D visualization of the processed *** is operated by DLR’s(German Aerospace Center’s)Multi-Mission Payload Ground Segment of its Remote Sensing Data Center at Oberpfaffenhofen,Germany.

关键词： Earth observation TerraSAR-X data mining system

Towards Golden Jubilee of Signing of Friendship Treaty in Beijing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Voice of Friendship 2011年第2期 36-38页

作者： Kojo Amoo-gottfried

The Ghana-China Friendship Association popularly referred to as Ghachifa is looking forward to the celebration of the golden jubilee of the signing of the Friendship

关键词： Golden golden looking signing Ambassador ceremony

The System-Diagnosis,a comprehensive method of diagnosing and therapy to allergy diseases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The System-Diagnosis,a comprehensive method of diagnosing an...