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Quasi-symmetric designs and biplanes of characteristic three

S.S Sane, M.S Shrikhande
1992 Journal of combinatorial theory. Series A  
ACKNOWLEDGMENT The first author gratefully acknowledges the hospitality of the Mathematics Department, Central Michigan University while doing this work.  ...  BIPLANES OF CHARACTERISTIC THREE A subclass of the larger class of quasi-symmetric designs with (x, y) = (0,2) studied in [ 111 is the family of biplanes, i.e., symmetric (u, k, 2) designs.  ...  In this section, we associate various designs and Steiner systems to a biplane of characteristic three which will be hopefully useful in obtaining further constraints on biplanes of characteristic three  ... 
doi:10.1016/0097-3165(92)90040-2 fatcat:akw4ymaacbdt5ctmg3unh2w2ze

Ternary codes, biplanes, and the nonexistence of some quasi-symmetric and quasi-3 designs [article]

Akihiro Munemasa, Vladimir D. Tonchev
2020 arXiv   pre-print
The dual codes of the ternary linear codes of the residual designs of biplanes on 56 points are used to prove the nonexistence of quasi-symmetric 2-(56,12,9) and 2-(57,12,11) designs with intersection  ...  numbers 0 and 3, and the nonexistence of a 2-(267,57,12) quasi-3 design.  ...  A symmetric 2-(v, k, λ) design D is a quasi-3 design [15] with triple intersection numbers x and y (x < y) if every three blocks of D intersect in either x or y points.  ... 
arXiv:2003.04453v3 fatcat:h3tmspzqbnarxlh5bgdrqmq6uy

On the non-existence of quasi-3 designs

Wayne Broughton, Gary McGuire
2003 Discrete Mathematics  
We also consider the question of whether the dual design of a quasi-3 design is a quasi-3 design.  ...  In this survey article we discuss the existence of quasi-3 designs, and settle the existence question for all v ¡ 144. The only such designs are the ones already known.  ...  The deÿnition of an SDP design is that the sum (mod 2) of (the characteristic vectors of) any three blocks B; B ; B is either a block or a block complement.  ... 
doi:10.1016/s0012-365x(02)00492-2 fatcat:dupefa3iuzgypeh3ky7ngwt6zm

Page 1776 of Mathematical Reviews Vol. , Issue 93d [page]

1993 Mathematical Reviews  
Sanpei Kageyama (J-HROSE) 93d:05022 05B05 51E05S Sane, S.S. (6-BOMB); Shrikhande, M.S. (1-CMI) Quasi-symmetric designs and biplanes of characteristic three. J. Combin. Theory Ser.  ...  The structure of biplanes of characteristic three is also consid- ered, including a new proof of a result of Mavron and Shrikhande [op. cit.].  ... 

Aerodynamic Characteristics and Effects of Winglets of the Boomless Tapered Supersonic Biplane during the Starting Process

Hiroshi YAMASHITA, Takashi FUJISONO, Atsushi TOYODA, Hiroki NAGAI, Keisuke ASAI, Shinkyu JEONG, Shigeru OBAYASHI
The aerodynamic characteristics and the effects of tip plates of a tapered supersonic biplane wing during the starting process were investigated by experimental and computational fluid dynamics (EFD/CFD  ...  Three types of wing models were used: one with a tip plate covering only the aft-half of the wing tip (type-A); one with a tip plate covering the entire wing tip (type-B); and one without a tip plate (  ...  Kanayama and Y. Isobe of Tohoku University for their helpful technical assistance regarding wind tunnel testing.  ... 
doi:10.2322/tastj.11.17 fatcat:yv6fmhpowfcnzihqpcwvqjzii4

Volume Contents

2004 European journal of combinatorics (Print)  
HAEMERS, W.H. and SPENCE, E., Enumeration of cospectral graphs . 199 DE LA HARPE, P. and PACHE, C., Spherical designs and finite group representations (some results of E.  ...  785 PACH, J., PINCHASI, R., TARDOS, G. and TÓTH, G., Geometric graphs with no self-intersecting path of length three . . . . . . . 793 KRÁL', D. andŠKREKOVSKI, R., Borodin's conjecture on diagonal coloring  ... 
doi:10.1016/s0195-6698(04)00156-8 fatcat:oaxmjjvb2nfs7emq4ufzk3xzau

Experimental investigation on performance improvement by mid-plane guide-vanes in a biplane-rotor Wells turbine for wave energy conversion

João S. Alves, Luís M.C. Gato, António F.O. Falcão, João C.C. Henriques
2021 Renewable & Sustainable Energy Reviews  
Results of turbine overall performance and flow details are reported from laboratory tests of a biplane Wells turbine without guide vanes and with specially designed guide vanes.  ...  This may be overcome by the presence of a row of guide vanes between the two rotor planes, a solution that had been proposed and investigated theoretically or by numerical modelling.  ...  Acknowledgements This work was partly funded by the Portuguese Foundation for Science and Technology (FCT) through IDMEC, under LAETA, project UIDB/50022/2020 and project MIT-EXPL/SOE/0094/2019.  ... 
doi:10.1016/j.rser.2021.111497 fatcat:hwtigg5qejdnrkrksybo26aori

Gap Effect on Flight Performance and Longitudinal Stability of Biplane Micro Air Vehicles

Muhammad Usman, Adnan Maqsood, Sundas R. Mulkana, Rizwan Riaz
2018 International Journal of Mechanical Engineering and Robotics Research  
characteristics.  ...  A rigid flat plate with an aspect ratio of one and three different planform shapes (Zimmerman, inverse Zimmerman and Elliptical) are used to study the effect of gap between two wings on the flight performance  ...  The work was supported by National University of Sciences & Technology and the numerical part was run on the HPC at the Research Centre for Modeling & Simulation  ... 
doi:10.18178/ijmerr.7.6.635-642 fatcat:xoxmnyiqercuxovzj4xha6oy5u

Graphs whose normalized Laplacian has three eigenvalues

E.R. van Dam, G.R. Omidi
2011 Linear Algebra and its Applications  
Strongly regular graphs and complete bipartite graphs are examples of such graphs, but we also construct more exotic families of examples from conference graphs, projective planes, and certain quasi-symmetric  ...  designs.  ...  Acknowledgements We thank a referee for some very useful suggestions, and Kris Coolsaet for writing a version of nauty's graph generator geng that filters graphs with diameter two.  ... 
doi:10.1016/j.laa.2011.02.005 fatcat:pky6uu34xbcadjcr32ndncfxcu

Parametric restrictions on quasi-symmetric designs [article]

Bhaskar Bagchi
2021 arXiv   pre-print
of quasi-symmetric 2-designs whose block graphs belong to any of these four classes.  ...  We prove parametric restrictions on quasi-symmetric 2-designs with a given connected block graph G and a given defect (absolute difference of the two intersection numbers) solely in terms of the defect  ...  Note that any Steiner 2-design is automatically quasi-symmetric of defect 1.  ... 
arXiv:2102.05576v2 fatcat:uyxuxdc5n5g2jofe7m7sojqohi

Theory, Analysis, and Applications of the Entropic Lattice Boltzmann Model for Compressible Flows

N. Frapolli, S. S. Chikatamarla, I. V. Karlin
2020 Entropy  
field around the Busemann biplane, and the interaction of vortices with a planar shock wave.  ...  We also discuss some key ideas of how to reduce the number of discrete speeds in three-dimensional simulations by pruning of the higher-order lattices, and introduce a new construction of the corresponding  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/e22030370 pmid:33286144 pmcid:PMC7516843 fatcat:m47jgv6yhvbilhd7z7y47pk5t4

Wells turbine for wave energy conversion: a review

Ahmed S. Shehata, Qing Xiao, Khalid M. Saqr, Day Alexander
2016 International Journal of Energy Research  
The article also provides a thorough 17 discussion of the use of computational fluid dynamics (CFD) for performance modeling and 18 design optimization of Wells turbine.  ...  It is found that a numerical model using the CFD code can 19 be employed successfully to calculate the performance characteristics of W-T as well as other 20 experimental and analytical methods.  ...  It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.  ... 
doi:10.1002/er.3583 fatcat:skbbmqihrjfi5ltckrht7ffpni

Ovoids of Generalized Quadrangles of Order (q, q^2-q) and Delsarte Cocliques in Related Strongly Regular Graphs [article]

Mohammad Adm, Ryan Bergen, Ferdinand Ihringer, Sam Jaques, Karen Meagher, Alison Purdy, Boting Yang
2021 arXiv   pre-print
This means that ve^- = m^-(e^- - k), where v is the number of vertices, k is the regularity, e^- is the smallest eigenvalue, and m^- is the multiplicity of e^-.  ...  We show that Delsarte cocliques do not exist for all Taylor's 2-graphs and for point graphs of generalized quadrangles of order (q,q^2-q) for infinitely many q.  ...  Acknowledgments The work in this paper was a joint project of the Discrete Mathematics Research Group at the University of Regina, attended by all the authors. We would like to thank Willem H.  ... 
arXiv:1705.02066v4 fatcat:wsypfw33ira2bluyte2djitoli

Computational fluid dynamics study of unconventional air vehicle configurations

R. Ramamurti, W. Sandberg, P. Vaiana, J. Kellogg, D. Cylinder
2005 Aeronautical Journal  
An unstructured grid based incompressible flow solver, called feflo, is used to simulate the flow past these novel configurations in order to determine the flight characteristics of these vehicles.  ...  One of the vehicles employs flapping wings which is inspired by the flight of birds or insects but does not copy it directly.  ...  ACKNOWLEDGEMENTS This work was supported by the Office of Naval Research through the Tactical Electronic Warfare Division Micro Air Vehicles Program of the Naval Research Laboratory, Washington DC, USA  ... 
doi:10.1017/s0001924000000786 fatcat:7p4jg74dnnampothbxbqdndplm

Numerical Analysis on Aerodynamic Force Generation of Biplane Counter-Flapping Flexible Airfoils

Jr-Ming Miao, Wei-Hsin Sun, Chang-Hsien Tai
2009 Journal of Aircraft  
explores the effect of chordwise flexible deformation on unsteady aerodynamic characteristics for biplane counter-flapping dual NACA0014 airfoils with various combinations of Reynolds number and reduced  ...  that of biplane rigid airfoils.  ... 
doi:10.2514/1.43181 fatcat:yulrrec2t5brdpls4jsdoff4fu
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