Results 101 to 110 of about 17,709 (313)

Habitat selection and -preferences of White-fronted- and Bean Geese Anser albifrons, A. fabalis at the Lower Rhine : historical changes and possible reasons [PDF]

, 2008
Die Arbeit untersucht Phänologie, Raumnutzung, Nahrungs- sowie Verhaltensökologie der am „Unteren Niederrhein“ überwinternden Bläss- und Saatgänse unter besonderer Berücksichtigung ihrer Konkurrenzsituation und der räumlichen Beweidungsrhythmik von ...
Ballasus, Hauke
core  

Multi-spectral piston sensor for co-phasing giant segmented mirrors and multi-aperture interferometric arrays

, 2009
This paper presents the optical design of a multi-spectral piston sensor suitable to co-phasing giant segmented mirrors equipping the Future Extremely Large Telescopes (ELTs).
Angel R, Courtès G, François Hénault, Hénault F, Labeyrie A, Martinache F   +5 more
core   +1 more source

Partially coherent ambiguity functions for depth-variant point spread function design [PDF]

, 2011
The ambiguity function (AF) provides a convenient way to model how a camera with a modified aperture responds to defocus. We use the AF to design an optimal aperture distribution, which creates a depth-variant point spread function (PSF) from a sparse ...
Gupta, Otkrist, Horstmeyer, Roarke William, Oh, Se Baek, Raskar, Ramesh   +3 more
core  

Re-regulation of commodity derivative markets: Critical assessment of current reform proposals in the EU and the US [PDF]

, 2013
In the context of recent commodity price hikes, a political consensus has emerged on regulatory measures to reduce excessive speculation in commodity derivative markets.
Küblböck, Karin, Staritz, Cornelia
core  

Unlocking Catalyst Activation as a Critical Bottleneck in Cross‐Coupling Reactions: Room‐Temperature Couplings of Weak Nucleophiles Enabled by [Pd(1‐MeNAP)TFA]2 Precatalysts

Angewandte Chemie International Edition, EarlyView.
In many Pd‐catalyzed cross‐couplings, catalyst performance has been found to be limited by catalyst activation. Methylnaphthyl (MeNAP) palladium trifluoroacetate dimers are presented as easy‐to‐store and easy‐to‐handle precursors, which rapidly activate under reaction conditions, even when only weakly coordinating, non‐reducing nucleophiles are present.
Sourav Manna, Henric F. Janning, Nikolaos V. Tzouras, Jane Anto Simplica Sagayaraj, Fadil Faizal Mannighayil, Angelino Doppiu, Lukas J. Gooßen   +6 more
wiley   +1 more source

Sulfur‐Directed Construction of Vinyl Cyclopropanes from 1,3‐Dienes

Angewandte Chemie International Edition, EarlyView.
Sulfur takes control. A pending thioether acts as a molecular compass, directing carbene addition to the 1,3‐diene scaffold with exceptional regio‑ and diastereocontrol to forge sulfur‐substituted vinyl cyclopropanes (S‐VCPs) — molecular architectures inaccessible via conventional cyclopropanation strategies.
Anna Keimer, Jonas Rettig, Tim‐Niclas Streit, Bob Barthel, Mélissa Calmels, Moritz Malischewski, Franz‐Lucas Haut   +6 more
wiley   +1 more source

Regulation of commodity derivative markets: Critical assessment of reforms in the EU [PDF]

, 2014
Commodity prices that are increasingly determined on global commodity derivative markets are important for economic and social development. The historically unprecedented commodity price boom - combined with high volatility - since the early-2000s has ...
Küblböck, Karin, Staritz, Cornelia
core  

From Two‐Electron to Four‐Electron System: Electrolyte Regulation for Advanced Aqueous Zn–I2 Batteries

Carbon Energy, EarlyView.
This review systematically summarizes recent progress in electrolyte‐regulated aqueous Zn–I2 batteries (AZIBs). It outlines the fundamentals of AZIBs along with their main challenges, and then analyzes electrolyte‐engineering strategies that improve both two‐ and four‐electron reactions.
Yucong Wang, Ruifeng Huang, Zhangchi Yang, Shaojian Zhang, Lijing Yan, Weijie Chen, Xiaolong Lin, Yongjun Li, Shuxing Wu, Zhan Lin, Jun Lu   +10 more
wiley   +1 more source

Efficient signal detector design for OTFS with index modulation

Digital Communications and Networks
In this paper, efficient signal detectors are designed for Orthogonal Time Frequency Space (OTFS) modulation with Index Modulation (IM) systems. Firstly, the Minimum Mean Squared Error (MMSE) based linear equalizer and its corresponding soft-aided ...
Yezeng Wu, Lixia Xiao, Yiming Xie, Guanghua Liu, Tao Jiang   +4 more
doaj   +1 more source

The Orthogonal Time Frequency Space (OTFS) Technique In 6G Wireless Communications [PDF]

BIO Web of Conferences
The orthogonal time-frequency space (OTFS) technique is a potential waveform modulation method that modulates data in the delaydoppler (DD) domain. OTFS differs from traditional multiplexing techniques by utilizing two-dimensional modulation to switch ...
Ramadhan Ali J., TaeiZadeh Ali
doaj   +1 more source