scholarly journals Graphs with unique maximum packing of closed neighborhoods

2020 ◽  
Author(s):  
Dragana BožoviĆ ◽  
Iztok Peterin
Keyword(s):  
Unique Maximum

Hub height optimisation of commercial WTGs based on accurate wind resource analysis

2021 ◽  
pp. 0309524X2110227
Author(s):  
Kyle O Roberts ◽  
Nawaz Mahomed
Keyword(s):  
Power Generation ◽  
Wind Turbine ◽  
Wind Power ◽  
Capacity Factor ◽  
Resource Analysis ◽  
Wind Speeds ◽  
Unique Maximum ◽  
Wind Measurements ◽  
Generation Capacity ◽  
Wind Resource

Wind turbine selection and optimal hub height positioning are crucial elements of wind power projects. However, in higher class wind speeds especially, over-exposure of wind turbines can lead to a reduction in power generation capacity. In this study, wind measurements from a met mast were validated according to specifications issued by IRENA and NREL. As a first step, it is shown that commercial WTGs from a database may be matched to the wind class and turbulence intensity. Secondly, a wind turbine selection algorithm, based on maximisation of capacity factor, was implemented across the range of WTGs. The selected WTGs were further exposed to an iterative algorithm using pointwise air density and wind shear coefficients. It is shown that a unique maximum capacity factor, and hence wind power generation, exists for a wind turbine, premised on its eventual over-exposure to the wind resource above a certain hub height.

scholarly journals Absolute and arbitrary orientation of single-molecule shapes

Science ◽  
2021 ◽  
Vol 371 (6531) ◽  
pp. eabd6179
Author(s):  
Ashwin Gopinath ◽  
Chris Thachuk ◽  
Anya Mitskovets ◽  
Harry A. Atwater ◽  
David Kirkpatrick ◽  
...  
Keyword(s):  
Single Molecule ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Dna Origami ◽  
Excitation Light ◽  
Optical Cavities ◽  
Large Scale Integration ◽  
Unique Maximum ◽  
Modular Platform ◽  
Scale Integration

DNA origami is a modular platform for the combination of molecular and colloidal components to create optical, electronic, and biological devices. Integration of such nanoscale devices with microfabricated connectors and circuits is challenging: Large numbers of freely diffusing devices must be fixed at desired locations with desired alignment. We present a DNA origami molecule whose energy landscape on lithographic binding sites has a unique maximum. This property enabled device alignment within 3.2° on silica surfaces. Orientation was absolute (all degrees of freedom were specified) and arbitrary (the orientation of every molecule was independently specified). The use of orientation to optimize device performance was shown by aligning fluorescent emission dipoles within microfabricated optical cavities. Large-scale integration was demonstrated with an array of 3456 DNA origami with 12 distinct orientations that indicated the polarization of excitation light.

scholarly journals COLREGs Compliant Fuzzy-based Collision Avoidance System for Multiple Ship Encounters

2021 ◽  
Author(s):  
Yaseen Adnan Ahmed ◽  
Mohammed Abdul Hannan ◽  
Mahmoud Yasser Oraby ◽  
Adi Maimun
Keyword(s):  
Collision Avoidance ◽  
Conflict Detection ◽  
Collision Risk ◽  
Fuzzy Membership Functions ◽  
Marine Traffic ◽  
Unique Maximum ◽  
Speed Change ◽  
Conflict Detection And Resolution ◽  
Resolution Algorithm ◽  
Collision Avoidance System

As the number of ships for marine transportation increases with the advancement of global trade, encountering multiple ships in marine traffic becomes common. This situation raises the risk of collision of the ships; hence this paper proposes a novel Fuzzy-logic based intelligent conflict detection and resolution algorithm, where the collision courses and possible avoiding actions are analyzed by considering ship motion dynamics and the input and output fuzzy membership functions are derived. As a conflict detection module, the Collision Risk (CR) is measured for each ship by using a scaled nondimensional Distance to the Closest Point of Approach (DCPA) and Time to the Closest Point of Approach (TCPA) as inputs. Afterwards, the decisions for collision avoidance are made based on the calculated CR, encountering angle and relative angle of each ship measured from others. In this regard, the rules for the Fuzzy interface system are defined in accordance with the COLREGs, and the whole system is implemented on the MATLAB Simulink platform. In addition, to deal with the multiple ship encounters, the paper proposes a unique maximum-course and minimum-speed change approach for decision making, which has been found to be efficient to solve Imazu problems, and other complicated multiple-ship encounters.

Evolving Factor Analysis for Frequency-Domain Lifetime Resolution of Fluorescence Spectra

1992 ◽  
Vol 46 (1) ◽  
pp. 28-33 ◽  
Author(s):  
David W. Millican ◽  
Linda B. McGown
Keyword(s):  
Factor Analysis ◽  
Aromatic Hydrocarbons ◽  
Fluorescence Spectra ◽  
Individual Component ◽  
Spectral Matrix ◽  
New Approach ◽  
Two Component ◽  
Polycyclic Aromatic ◽  
Unique Maximum ◽  
Fundamental Limitation

Evolving factor analysis (EFA) is a new approach to the resolution of individual component spectra on the basis of fluorescence lifetime differences. Phase-resolved fluorescence spectra collected at several excitation modulation frequencies are well suited to EFA resolution because the frequency-response curve of phase-resolved intensity for each lifetime component has a single, unique maximum. Unlike other self-modeling spectral matrix resolution methods, EFA has no fundamental limitation upon the number of components that can be resolved. In this work, the resolution of two-component and three-component mixtures of polycyclic aromatic hydrocarbons is demonstrated.

scholarly journals Graph unique-maximum and conflict-free colorings

2011 ◽  
Vol 9 (3) ◽  
pp. 241-251 ◽  
Author(s):  
Panagiotis Cheilaris ◽  
Géza Tóth
Keyword(s):  
Unique Maximum

scholarly journals Unique-Maximum and Conflict-Free Coloring for Hypergraphs and Tree Graphs

2013 ◽  
Vol 27 (4) ◽  
pp. 1775-1787 ◽  
Author(s):  
Panagiotis Cheilaris ◽  
Balázs Keszegh ◽  
Dömötör Pálvölgyi
Keyword(s):  
Tree Graphs ◽  
Unique Maximum

scholarly journals Facial unique-maximum colorings of plane graphs with restriction on big vertices

2019 ◽  
Vol 342 (9) ◽  
pp. 2612-2617 ◽  
Author(s):  
Bernard Lidický ◽  
Kacy Messerschmidt ◽  
Riste Škrekovski
Keyword(s):  
Plane Graphs ◽  
Unique Maximum

Speed of convergence to an extreme value distribution for non-uniformly hyperbolic dynamical systems

2015 ◽  
Vol 15 (04) ◽  
pp. 1550028 ◽  
Author(s):  
Mark Holland ◽  
Matthew Nicol
Keyword(s):  
Dynamical Systems ◽  
Convergence Rates ◽  
Hyperbolic Systems ◽  
Extreme Value Distribution ◽  
Extreme Value ◽  
Value Distribution ◽  
Recurrence Time ◽  
Quadratic Maps ◽  
Uniformly Hyperbolic Systems ◽  
Unique Maximum

Suppose (f, 𝒳, ν) is a dynamical system and ϕ : 𝒳 → ℝ is an observation with a unique maximum at a (generic) point in 𝒳. We consider the time series of successive maxima Mn(x) := max {ϕ(x),…,ϕ ◦ fn-1(x)}. Recent works have focused on the distributional convergence of such maxima (under suitable normalization) to an extreme value distribution. In this paper, for certain dynamical systems, we establish convergence rates to the limiting distribution. In contrast to the case of i.i.d. random variables, the convergence rates depend on the rate of mixing and the recurrence time statistics. For a range of applications, including uniformly expanding maps, quadratic maps, and intermittent maps, we establish corresponding convergence rates. We also establish convergence rates for certain hyperbolic systems such as Anosov systems, and discuss convergence rates for non-uniformly hyperbolic systems, such as Hénon maps.

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