Filters








1,129 Hits in 2.6 sec

Multiperiod Heat Exchanger Network Synthesis With Pinch-Based Strategies and Metaheuristics

Leandro V. Pavão, Caliane B. B. Costa, Mauro A. S. S. Ravagnani
2022 Frontiers in Sustainability  
The method was able to outperform previous literature regarding total annual costs (TAC) for the multiperiod HEN developed.  ...  The case study approached is one of the largest multiperiod cases for HEN synthesis in the literature (15 streams, 4 periods). The obtained solution has TAC 3.5% lower than the literature solutions.  ...  Another observed aspect is the presence of max functions. For a given heat exchanger, different heat exchange surface values may be required according to the operating period.  ... 
doi:10.3389/frsus.2022.888251 fatcat:rdseruvitbhunpqfc7raaa2iwy

Spherical Planetary Ball Transmissions: Geometrical Synthesis

Mikhail E. Lustenkov
2014 OALib  
Theoretical principles are illustrated by examples of design of reducer unit.  ...  The design of spherical transmission with the constant reduction ratio is developed.  ...  Figure 6 . 6 Difference in values of coordinate z for sinusoids and curve on Equation (19): 1-for monoperiod curves, 2-for multiperiod curves.  ... 
doi:10.4236/oalib.1100486 fatcat:2nhqjrnqg5cqhch3nuo6rfojye

Multiplexing complex two-dimensional photonic superlattices

Martin Boguslawski, Andreas Kelberer, Patrick Rose, Cornelia Denz
2012 Optics Express  
We introduce a universal method to optically induce multiperiodic photonic complex superstructures bearing two-dimensional (2D) refractive index modulations over several centimeters of elongation.  ...  frequencies of the respective Fourier series expansions, which enables us to use nondiffracting beams in the experiment showing periodic 2D intensity modulation in order to successively develop the desired multiperiodic  ...  Thus, the rule for the development of a multiperiodic 2D wire mesh function in hexagonal symmetry reads as and is equivalent to Eq. (6) .  ... 
doi:10.1364/oe.20.027331 pmid:23187588 fatcat:43bxaf26pzhlnnkwerfpsogk7q

Optical Waveguides with Compound Multiperiodic Grating Nanostructures for Refractive Index Sensing

Lars Thorben Neustock, Sabrina Jahns, Jost Adam, Martina Gerken
2016 Journal of Sensors  
We designed, fabricated, and characterized 24 different compound multiperiodic nanostructured waveguides for refractive index sensing.  ...  For the TM resonances the compound multiperiodic nanostructures exhibit higher sensitivity values compared to the monoperiodic nanostructure and similar values as the aperiodic nanostructures.  ...  Conclusion We designed, fabricated, and characterized 24 different compound multiperiodic nanostructured waveguides for refractive index sensing.  ... 
doi:10.1155/2016/6174527 fatcat:lr5qmnbbmnhidhdwafmzngjsxq

Photonic ratchet superlattices by optical multiplexing

Martin Boguslawski, Andreas Kelberer, Patrick Rose, Cornelia Denz
2012 Optics Letters  
multiperiodic lattices.  ...  We present a method based on incremental holographic multiplexing to create a refractive index ratchet distribution into a photorefractive crystal as an example for the generation principle of such complex  ...  Our results prove a high functionality of this multiplexing technique to induce multiperiodic photonic structures.  ... 
doi:10.1364/ol.37.000797 pmid:22378397 fatcat:p7xzlxkhsjarjk4zefyn4a3tpi

Page 4600 of Mathematical Reviews Vol. , Issue 94h [page]

1994 Mathematical Reviews  
Hans Sachs (A-MNT; Leoben) 94h:53005 53A05 65D17 68U05 Ferguson, Helaman; Rockwood, Alyn (1-AZS-C; Tempe, AZ) Multiperiodic functions for surface design.  ...  (English summary) Free-form curves and free-form surfaces (Oberwolfach, 1992). Comput. Aided Geom. Design 10 (1993), no. 3-4, 315-328.  ... 

Intensity-based readout of resonant-waveguide grating biosensors: Systems and nanostructures

Moritz Paulsen, Sabrina Jahns, Martina Gerken
2017 Photonics and Nanostructures - Fundamentals and Applications  
To further improve the signal-to-noise ratio advanced nanostructure designs are investigated for RWGs. Here, results on multiperiodic and deterministic aperiodic nanostructures are presented.  ...  These advanced nanostructures allow for the design of the number and wavelengths of the RWG resonances.  ...  We thank Torben Karrock for taking the scanning electron microscopy images.  ... 
doi:10.1016/j.photonics.2017.07.003 fatcat:dwhzgcsjdzg3vjgfdjp5tl2gqa

Surface plasmon polariton pulse shaping via two-dimensional Bragg grating pairs

Kevin T. Crampton, Alan G. Joly, Patrick Z. El-Khoury
2020 Nanophotonics  
In addition, we examine multiperiodic arrays (MPAs) consisting of arrays with different pitches placed adjacent to one another.  ...  AbstractWe demonstrate control over the spatial and temporal properties of surface plasmon polaritons (SPPs) launched from nanohole arrays in silver.  ...  To reach the next level of design, detailed control of the SPP fields themselves is desirable. Both the spatial and spectral characteristics are relevant design parameters in this context.  ... 
doi:10.1515/nanoph-2020-0522 fatcat:uorqsc3grvdkxh3jxq5dblqfsi

Multiperiod Hypergraph Models for Water Systems Optimization

Giovanni M. Sechi, Paola Zuddas
2007 Water resources management  
The hypergraph structure is derived from a multiperiod network describing the spatial and temporal structure of the physical system.  ...  In this paper a water resources management model including a reservoir design problem is studied, and the methodology is tested by the hypergraph simplex algorithm on a real water resources system on the  ...  for the reservoir design problem.  ... 
doi:10.1007/s11269-007-9163-2 fatcat:7rmtkw63qjb63cprain3xmzuoe

Network Flow Programming Model for Multireservoir Sizing

Khaliquzzaman, Subhash Chander
1997 Journal of water resources planning and management  
、Elements of PM are natural numbers which are used in a cost enhancement function for calculating the relative cost for the multiple storage arcs.  ...  Few of these models like AL-V and the model of Kuczera 「 19891 are multiperiod where optimization process extends for many periods.  ... 
doi:10.1061/(asce)0733-9496(1997)123:1(15) fatcat:75luxako2vbohkxv3tezfs3pai

Bayesian portfolio selection with multi-variate random variance models

Refik Soyer, Kadir Tanyeri
2006 European Journal of Operational Research  
J We consider multiperiod portfolio selection problems for a decision maker with a specified utility function when the variance of security returns is described by a discrete time stochastic model.  ...  We present a simulation-based method to solve these problems adopting an approach which replaces the preposterior analysis by a surface fitting based optimization approach.  ...  Our method is based on the curve surface fitting°a pproach of Muller and Parmigiani (1995) that was developed for optimal design problems.  ... 
doi:10.1016/j.ejor.2005.01.012 fatcat:dcpeftuurjfazgjlpqcw4yniwi

Enhanced light absorption in GaN∕AlGaN midinfrared detectors and application for pixel-less upconversion imaging

L. K. Wu, H. L. Hao, W. Z. Shen
2008 Journal of Applied Physics  
single-and multiperiod GaN / AlGaN MIR HEIWIPs to enhance the light absorption in the detectors.  ...  Based on the experimental responsivity of single-period GaN / AlGaN midinfrared ͑MIR͒ heterojunction interfacial work-function internal photoemission ͑HEIWIP͒ detectors, we have optimized in detail the  ...  By using Maxwell equations and the boundary conditions for the electrical vector continuity on the surface between two layers with complex refractive indices ͑ñ j , ñ j+1 ͒, we can express the electric  ... 
doi:10.1063/1.2885121 fatcat:c3zhvdsldjcfvhz74e7wxwgryi

Page 779 of American Society of Civil Engineers. Collected Journals Vol. 109, Issue 6 [page]

1983 American Society of Civil Engineers. Collected Journals  
The HEEM was designed to evaluate project benefits based on aggre- gate relationships developed for various highway types.  ...  The HIAP and PPS develop a multiperiod investment strat- egy which is established based on the optimization of user benefits.  ... 

Page 7247 of Mathematical Reviews Vol. , Issue 98K [page]

1998 Mathematical Reviews  
Summary: “Model seiection for time series data based upon joint multiperiod forecasts is investigated.  ...  For this situation we present adequate designs which show, at least, a nearly optimal performance.” 98k:62168 62M40 Steif, Jeffrey E.  ... 

Near Continuous Photometry with the Whole Earth Telescope (WET)

J. E. Solheim
2003 Open Astronomy  
Maidanak in Uzbekistan, has been important for the success of the network.  ...  Fig. 2 . 2 The left panel shows the sampling function or "window function" (in amplitude units) for a continuous light curve of 54 h duration.  ...  Figure 2 left shows the window function for a light curve taken without interruptions, which is a δ function, while Figure 2 right shows the window function when we observe three consecutive nights  ... 
doi:10.1515/astro-2017-0065 fatcat:pikuqyrplbahtnxozisl3nvhuu
« Previous Showing results 1 — 15 out of 1,129 results