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Littérature scientifique sur le sujet « Crossed squares »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Crossed squares"

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Temel, Sedat, Tunşar Şahan et Osman Mucuk. « Crossed modules, double group-groupoids and crossed squares ». Filomat 34, n^o 6 (2020) : 1755–69. http://dx.doi.org/10.2298/fil2006755t.

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The purpose of this paper is to obtain the notion of crossed module over group-groupoids considering split extensions and prove a categorical equivalence between these types of crossed modules and double group-groupoids. This equivalence enables us to produce various examples of double groupoids. We also prove that crossed modules over group-groupoids are equivalent to crossed squares.

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Ellis, Graham. « Crossed squares and combinatorial homotopy ». Mathematische Zeitschrift 214, n^o 1 (septembre 1993) : 93–110. http://dx.doi.org/10.1007/bf02572393.

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Temel, Sedat. « Crossed squares, crossed modules over groupoids and cat1−2−groupoids ». Categories and General Algebraic Structures with Application 13, n^o 1 (1 octobre 2020) : 125–42. http://dx.doi.org/10.29252/cgasa.13.1.125.

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Sterck, Florence. « Crossed squares of cocommutative Hopf algebras ». Journal of Algebra 584 (octobre 2021) : 270–303. http://dx.doi.org/10.1016/j.jalgebra.2021.05.018.

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Arvasi, Z., et E. Ulualan. « Quadratic and 2-Crossed Modules of Algebras ». Algebra Colloquium 14, n^o 04 (décembre 2007) : 669–86. http://dx.doi.org/10.1142/s1005386707000624.

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In this work, we define the quadratic modules for commutative algebras and give relations among 2-crossed modules, crossed squares, quadratic modules and simplicial commutative algebras with Moore complex of length 2.

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Gilbert, N. D., et P. J. Higgins. « The non-abelian tensor product of groups and related constructions ». Glasgow Mathematical Journal 31, n^o 1 (janvier 1989) : 17–29. http://dx.doi.org/10.1017/s0017089500007515.

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The tensor product of two arbitrary groups acting on each other was introduced by R. Brown and J.-L. Loday in [5, 6]. It arose from consideration of the pushout of crossed squares in connection with applications of a van Kampen theorem for crossed squares. Special cases of the product had previously been studied by A. S.-T. Lue [10] and R. K. Dennis [7]. The tensor product of crossed complexes was introduced by R. Brown and the second author [3] in connection with the fundamental crossed complex π(X) of a filtered space X, which also satisfies a van Kampen theorem. This tensor product provides an algebraic description of the crossed complex π(X ⊗ Y) and gives a symmetric monoidal closed structure to the category of crossed complexes (over groupoids). Both constructions involve non-abelian bilinearity conditions which are versions of standard identities between group commutators. Since any group can be viewed as a crossed complex of rank 1, a close relationship might be expected between the two products. One purpose of this paper is to display the direct connections that exist between them and to clarify their differences.

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Hardge, T., K. Koepke, M. Reissmann et K. Wimmers. « Maternal influences on litter size and growth in reciprocal crossed Miniature Pigs and Durocs ». Archives Animal Breeding 42, n^o 1 (10 octobre 1999) : 83–92. http://dx.doi.org/10.5194/aab-42-83-1999.

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Abstract. In order to demonstrate the potential power of maternal effects on litter size and growth in pigs a reciprocal cross of Berlin Miniature Pigs and Durocs was carried out. The average body weight of the Duroc dams (151 kg) was more than three times higher than the weight of the Miniature Pig dams (48 kg). A considerable maternal effect on fertility, estimated from reciprocal crossbred differences in the litter size of 3.5 piglets was found. The least Squares means of birth weight were 1.18 kg and 0.75 kg for Fl animals bom from Duroc dams and Miniature Pig dams, respectively. This maternal caused disadvantage in body weight of crossbred offspring from Miniature Pig dams is compensated in the interval from weaning to the 13th week of age. The end weight estimated by means of Gompertz and Bertalanffy growth functions showed only minor differences between the reciprocal crossed groups in favour of Fl born from Duroc dams. Our data suggest that the uterine capacity of the dam could play an important role in the fertility of extreme breed crosses. Concerning growth performance the milk yield of the sow and the influence of the birthweight of the piglets were discussed.

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Arvasi, Zekeriya, et Erdal Ulualan. « Homotopical aspects of commutative algebras I : freeness conditions for crossed squares ». Journal of Homotopy and Related Structures 10, n^o 3 (13 décembre 2013) : 495–518. http://dx.doi.org/10.1007/s40062-013-0070-3.

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SHEKHAWAT, NEELAM, HEMLATA SHARMA et K. S. CHANDRAWAT. « Heterosis and combining ability analysis for yield and its component traits in Indian mustard (Brassica juncea) ». Indian Journal of Agricultural Sciences 92, n^o 8 (28 mars 2022) : 952–56. http://dx.doi.org/10.56093/ijas.v92i8.96674.

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Ten diverse lines of Indian mustard [Brassica juncea (L.) Czern. & Coss.] were crossed in diallel mating design excluding reciprocals during winter (rabi) season 2014–15 to study heterosis and combining ability. The mean squares due to genotypes including parents, crosses and parents vs. crosses were significant for all the traits. The analysis of variance revealed significant mean sum of squares of general combining ability (GCA) and specific combining ability (SCA) for most of the characters at all three environments, except mean sum of squares due to GCA for length of siliqua in E3 environment and mean sum of squares due to SCA for plant height in E1 and for number of secondary branches per plant in E3 environment. In pooled analysis, mean squares due to GCA, SCA, GCA × E and SCA × E were significant for all the eight characters except SCA × E for plant height and GCA × E for protein content. The estimates of GCA effects revealed that parents, viz. Pusa Vijay, PM-30 and Bio-902 were good general combiners for yield contributing traits and the best specific cross combinations for yield and its attributing traits were PM-27 × RGN-229, PM-27 × RGN-73, Pusa Vijay × Laxmi, Pusa Vijay × DRMR-IJ-31 and Pusa Vijay × RGN-73 on the basis of pooled analysis. The crosses Bio-902 × RGN-48, PM-30 × Bio-902 and Bio-902 × RGN-73 exhibited highest and positive significant heterotic effects for seed yield per plant and its important component traits. These F1s may be exploited for obtaining transgressive segregants for development of hybrid varieties in Indian mustard.

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Mutlu, A., et T. Porter. « Freeness Conditions for Crossed Squares and Squared Complexes Dedicated to Professor Daniel Quillen on his Sixtieth Birthday ». K-Theory 20, n^o 4 (août 2000) : 345–68. http://dx.doi.org/10.1023/a:1026535602325.

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Thèses sur le sujet "Crossed squares"

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PIZZAMIGLIO, LINDA. « Cohomologies of crossed modules ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50169.

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Britton, Michael C. « Practical square cross-section helical antennas ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ43337.pdf.

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Britton, Michael C. (Michael Charles) Carleton University Dissertation Engineering Electronics. « Practical square cross-section helical antennas ». Ottawa, 1999.

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4

Skoglund, Ingegerd. « Algorithms for a Partially Regularized Least Squares Problem ». Licentiate thesis, Linköping : Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8784.

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Wegelin, Jacob A. « Latent models for cross-covariance / ». Thesis, Connect to this title online ; UW restricted, 2001. http://hdl.handle.net/1773/8982.

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Onipede, Bolarinwa O. « Design of a cross section reduction extrusion tool for square bars ». Texas A&M University, 2005. http://hdl.handle.net/1969.1/4880.

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The objective of this project is to design a tool for moderate cross section reduction of bars that are deformed within a channel slider tool that is used for equal channel angular extrusion (ECAE). The bars that are deformed via ECAE have an initial square cross section with a nominal value of 1.00 in2 and aspect ratios (length/width) ranging between 4 and 6. A systems engineering design methodology is used to generate a topbottom approach in the development of the tool's design. This includes defining a need statement, which is the "Need for an area reduction extrusion tool to replace the current practices of machining ECAE processed billets". The system functions and requirements are defined next and used to generate three concepts that are compared to select the winning concept for further refinement. Major components of the selected tool are: a container, ram, base plate, punch plate, four die-inserts, four wedges and four flange locks. For materials, such as copper (C10100) and aluminum (Al6061-T6), that can be processed by this tool, the upper bound extrusion pressure, which is derived by limit analysis, is set at 192 ksi. The upper bound extrusion pressure is constrained by the buckling limit of the ram, which is 202 ksi. The maximum wall stress experienced by the container is 113 ksi. For materials with the same cross section and dimensions, fixed end conditions of the Ram support larger bucking loads when compared to other end conditions such as rounded ends or rounded-fixed ends. With the application of the upper bound method, an increase in the extrusion ratio of the tool causes a corresponding rise in the optimal cone angle of the die further translating to a rise in the extrusion pressure.

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Leong, Wa-Un Alexis. « A study of aerodynamic and mechanical interference effects between two neighbouring square towers ». Thesis, University of Glasgow, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311865.

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Kircher, Andrew J. « Estimation of the Squared Population Cross-Validity Under Conditions of Predictor Selection ». TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1472.

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The current study employed a Monte Carlo design to examine whether samplebased and formula-based estimates of cross-validated R2 differ in accuracy when predictor selection is and is not performed. Analyses were conducted on three datasets with 5, 10, or 15 predictors and different predictor-criterion relationships. Results demonstrated that, in most cases, a formula-based estimate of the cross-validated R2 was as accurate as a sample-based estimate. The one exception was the five predictor case wherein the formula-based estimate exhibited substantially greater bias than the estimate from a sample-based cross validation study. Thus, formula-based estimates, which have an enormous practical advantage over a two sample cross validation study, can be used in most cases without fear of greater error.

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Fernandes, Diogo. « Low-cost implementation techniques for generic square and cross M-QAM constellations ». Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/1555.

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CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
Este trabalho tem como objetivo apresentar técnicas com complexidade computacional reduzida para implementação em hardware do modulador de amplitude em quadratura M-ária (M-ary quadrature amplitude modulation - M-QAM) de elevada ordem, que pode ser viável para sistemas banda larga. As técnicas propostas abrangem as constelações M-QAM quadradas e cruzadas (número par e ímpar de bits), a regra de decisão abrupta (hard decison rule), derivação de constelações M-QAM de baixa ordem das de elevada ordem. A análise de desempenho em termos de taxa de bits errados (bit error rate - BER) é realizada quando os símbolos M-QAM são corrompidos por ruído Gaussiano branco aditivo (additive white Gaussian noise - AWGN) e ruído Gaussiano impulsivo aditivo (additive impulsive Gaussian noise - AIGN). Os resultados de desempenho da taxa de bits errados mostram que a perda de desempenho das técnicas propostas é, em média, inferior a 1 dB, o que é um resultado surpreendente. Além disso, a implementação das técnicas propostas em arranjo de portas programÃ¡veis em campo (field programmable gate array - FPGA) é descrita e analisada. Os resultados obtidos com as implementações em dispositivo FPGA mostram que as técnicas propostas podem reduzir consideravelmente a utilização de recursos de hardware se comparadas com as técnicas presentes na literatura. Uma melhoria notável em termos de redução da utilização de recursos de hardware é conseguida através da utilização da técnica de modulação M-QAM genérica em comparação com a técnica de regra de decisão heurística (heuristic decision rule - HDR) aprimorada e uma técnica previamente concebida, a tÃ c cnica HDR. Com base nas análises apresentadas, a técnica HDR aprimorada é menos complexa do que a técnica HDR. Finalmente, os resultados numéricos mostram que a técnica de modulação M-QAM genérica pode ser oito vezes mais rápida do que as outras duas técnicas apresentadas, quando um grande número de símbolos M-QAM (p. ex., > 1000) são transmitidos consecutivamente.
This work aims at introducing techniques with reduced computational complexity for hardware implementation of high order M-ary quadrature amplitude modulation (MQAM) which may be feasible for broadband communication systems. The proposed techniques cover both square and cross M-QAM constellations (even and odd number of bits), hard decision rule, derivation of low-order M-QAM constellations from high order ones. Performance analyses, in terms of bit error rate (BER) is carried out when the M-QAM symbols are corrupted by either additive white Gaussian noise (AWGN) or additive impulsive Gaussian noise (AIGN). The bit error rate performance results show that the performance loss of the proposed techniques is, on average, less than 1 dB, which is a remarkable result. Additionally, the implementation of the proposed techniques in field programmable gate array (FPGA) device is described and outlined. The results based on FPGA show that the proposed techniques can considerably reduce hardware resource utilization. A remarkable improvement in terms of hardware resource utilization reduction is achieved by using the generic M-QAM technique in comparison with the enhanced heuristic decision rule (HDR) technique and a previously designed technique, the HDR technique. Based on the analyses performed, the enhanced HDR technique is less complex than the HDR technique. Finally, the numerical results show that the generic M-QAM technique can be eight times faster than the other two techniques when a large number of M-QAM symbols (e.g., > 1000) are consecutively transmitted.

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Sudarsan, Rangarajan. « Numerical investigation of shear-driven flow in a toroid of square cross-section ». Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279918.

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A numerical investigation has been performed for the 3-D flow of an incompressible fluid in a torus shaped enclosure of square cross-section, where the fluid motion is induced by sliding the top wall of the enclosure radially outwards. The flow in this geometry is characterized by two non-dimensional numbers, the curvature ratio (δ=d/Rc) and the Reynolds number (Re=uwalld/v) where Rc is the radius of curvature of the torus at the center of the cavity, d is the side length of the enclosure cross-section and uwall the velocity of the top wall of the enclosure. Calculations were performed for 3-D flow in an almost straight enclosure with δ = 0.005 at Re = 3200 and a strongly curved one with δ = 0.25 at Re = 2400. The 3-D flow was computed by choosing a small sector of the torus and applying periodic boundary conditions along the circumferential boundary. The 3-D flow calculations were started with axi-symmetric flow as initial condition and perturbed by a small random disturbance to seed the centrifugal instability into the flow. Integral quantites defined using different components of the vorticity were monitored at different cross sectional planes to study the development and dynamics of the 3-D flow. A technique of volume visualization was used to visualize r vorticity and θ vorticity contours through out the computational domain to understand the dynamics of the 3-D flow. The 3-D flow calculated for both cases δ = 0.005 and 0.25 shows span-wise vortices also called Taylor-Gortler-Like vortices. These vortices while being convected around by the primary re-circulating flow in the torus cross-section experience span-wise oscillation resulting from a secondary instability accompanied by their growth and collapse in size. The net effect of this dynamics results in the periodic rearrangement of the vortices, when viewed along the circumferential span. Volume visualization of r-vorticity contours show the existence of two pairs of vortices wrapped around each other as they are convected around by the primary re-circulating flow. The dynamics that induce the periodic rearrangement have been explained from volume visualization of the vorticity components. "Vortex tilting" of theta-component of vorticity is identified as a mechanism for explaining the interaction of the primary re-circulating flow in the span-wise vortices present.

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Livres sur le sujet "Crossed squares"

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Cammilleri, Rino. Il quadrato magico. Milano : Rizzoli, 1999.

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2

Wu, Jie. A least-squares finite element method for electromagnetic scattering problems. [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1996.

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Jie, Wu. A least-squares finite element method for electromagnetic scattering problems. [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1996.

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1940-, Jiang Bo-Nan, et Lewis Research Center. Institute for Computational Mechanics in Propulsion., dir. A least-squares finite element method for electromagnetic scattering problems. [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1996.

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Catholic Church. Pontificium Consilium pro Familia. The way of the cross during the jubilee of families : October 12, 2000 in St. Peter's Square. Citta del Vaticano : Pontifical Council for the Family, 1996.

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Understanding Tahrir Square : What transitions elsewhere can teach us about the prospects for Arab democracy. Washington, D.C : Brookings Institution Press, 2014.

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Books, China Exercise Books. 练习本 ; Chinese Empty Exercise Book for Calligraphy, Crossed Squares. Independently Published, 2019.

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Walsh, Bruce, et Michael Lynch. Analysis of Short-term Selection Experiments : 1. Least-squares Approaches. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198830870.003.0018.

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This chapter examines short-term (a few generations) selection response in the mean of a trait. Traditionally, such experiments are analyzed using least-squares (LS) approaches. While ordinary LS (OLS) is often used, genetic drift causes the residual to be both correlated and heteroscedastic, resulting in the sampling variances given by OLS being too small. This chapter details the appropriate general LS (GLS) approaches to properly account for this residual error structure. It also reviews some of the common features observed in short-term selection experiments and examines experimental designs, such as the use of a control population versus a divergence-selection approach. It concludes by discussing another linear model used mainly by plant breeders, generation-means analysis (GMA), wherein remnant seed for several generations of response are crossed and then grown in a common garden. Such an analysis can provide insight into the genetic nature of any response.

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Cigarette Sellers of Three Crosses Square. Runestone Pr, 2000.

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Spirit of Life Crosses & Doves in Square Bracelet. Monarch Creations, 2000.

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Chapitres de livres sur le sujet "Crossed squares"

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Chin, Wynne W. « Bootstrap Cross-Validation Indices for PLS Path Model Assessment ». Dans Handbook of Partial Least Squares, 83–97. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-32827-8_4.

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Ruiz, David Martín, Dwayne D. Gremler, Judith H. Washburn et Gabriel Cepeda Carrión. « Reframing Customer Value in a Service-Based Paradigm : An Evaluation of a Formative Measure in a Multi-industry, Cross-cultural Context ». Dans Handbook of Partial Least Squares, 535–66. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-32827-8_24.

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Chin, Wynne W., et Jens Dibbern. « An Introduction to a Permutation Based Procedure for Multi-Group PLS Analysis : Results of Tests of Differences on Simulated Data and a Cross Cultural Analysis of the Sourcing of Information System Services Between Germany and the USA ». Dans Handbook of Partial Least Squares, 171–93. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-32827-8_8.

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Intrigila, Claudio, Nicola Antonio Nodargi et Paolo Bisegna. « Square Cross Vaults on Spreading Supports ». Dans RILEM Bookseries, 1045–53. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-99441-3_113.

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Cleophas, Ton J., et Aeilko H. Zwinderman. « Chi-Square Tests for Cross-Tabs ». Dans Statistical Analysis of Clinical Data on a Pocket Calculator, 31–34. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1211-9_11.

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Cleophas, Ton J., et Aeilko H. Zwinderman. « Chi-Square Tests for Large Cross-Tabs ». Dans Clinical Data Analysis on a Pocket Calculator, 237–41. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27104-0_42.

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Zeng, Lijiang, et Lifeng Li. « Fabrication of Square-Lattice Crossed Gratings Based on Diffraction of a Reference Grating ». Dans Fringe 2013, 827–30. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36359-7_150.

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Su, Z. D., Y. Liu, H. J. Zhang et D. F. Zhang. « Force Control of a Square Cylinder in Cross Flow ». Dans New Trends in Fluid Mechanics Research, 497. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_160.

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Aneja, Varun, et Neelam Rani. « Interference Effect Between Tall Buildings with Square Cross-Sections ». Dans Lecture Notes in Civil Engineering, 43–54. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4055-2_4.

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Sadanala, Chiranjeevi, Swapnajit Pattnaik et Vinay Pratap Singh. « A Novel Cross Connected Square T-Type Multilevel Inverter ». Dans Advances in Automation, Signal Processing, Instrumentation, and Control, 1737–48. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8221-9_162.

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Actes de conférences sur le sujet "Crossed squares"

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Tyler, Glenn A. « Noise Effects in Crossed Beam C n 2 Estimation ». Dans Adaptive Optics for Large Telescopes. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/aolt.1992.ama3.

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Although crossed beam C n 2 measurement techniques have been used in the past it has generally been known that they are quite sensitive to measurement noise.1,2 Recently a matrix formulation of this concept has been implemented to develop a least-squares estimator for the unknown C n 2 -profile. This newly developed estimator is applicable to scintillation measurements, wavefront gradient measurements or a combination of the two and provides the best estimate in the presence of noise.

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Schuster, Gerard T. « Least‐squares cross‐well migration ». Dans SEG Technical Program Expanded Abstracts 1993. Society of Exploration Geophysicists, 1993. http://dx.doi.org/10.1190/1.1822308.

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Kirk, Donnacha, Filipe Batoni Abdalla, Aurelien Benoit Levy, Philip Bull et Benjamin Joachimi. « Cross correlation surveys with the Square Kilometre Array ». Dans Advancing Astrophysics with the Square Kilometre Array. Trieste, Italy : Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.215.0020.

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Giudici, M., J. Mulet, J. Javaloyes et S. Balle. « Square-wave switching by crossed-polarization reinjection in VCSELs ». Dans 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/cleoe-iqec.2007.4386994.

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Jelic, Vibor, Benedetta Ciardi, Elizabeth Fernandez, Hiroyuki Tashiro et Dijana Vrbanec. « SKA - EoR correlations and cross-correlations : kSZ, radio galaxies, and NIR background ». Dans Advancing Astrophysics with the Square Kilometre Array. Trieste, Italy : Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.215.0008.

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Liang, Shu, Bo Chen, Menglong Chen, Jing Tian, Jiuzhou Gao et Qi Xie. « Broadband Circularly Polarized Crossed-Dipole Antenna with a Square Loop ». Dans 2020 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2020. http://dx.doi.org/10.1109/icmmt49418.2020.9386922.

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Cao, Zhen, Zan Wu, Jin-yuan Qian et Bengt Sunden. « Water-Oil Flow in Square Microchannels With a Crossed Junction ». Dans ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83056.

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In the present study, water-oil flow patterns and slug hydrodynamics were experimentally studied in square glass microchannels with various hydraulic diameters (Dh = 600 μm, 400 μm, 200 μm). The aqueous phase is the continuous phase while the organic phase is the dispersed phase. The ranges of flow rates of the continuous phase and the dispersed phase are 0–200 ml/h and 0–12 ml/h, 0–120 ml/h and 0–6 ml/h, and 0–60 ml/h and 0–2 ml/h in the microchannels with Dh = 600 μm, 400 μm and 200 μm, respectively. The results show that the hydraulic diameter has significant effects on flow patterns and three main flow patterns are observed, i.e., annular flow, slug flow and droplet flow. Generally, annular flow appeared at high flow rates of the dispersed phase and low flow rates of the continuous phase, while droplet flow appeared at low flow rates of the dispersed phase and high flow rates of the continuous phase. However, slug flow existed at comparable flow rates of the continuous and dispersed phases. A dimensionless analysis is carried out and a new dimensionless group including Weber number and Reynolds number is derived. The new defined dimensionless group performs well to develop a general flow pattern map. In addition, slug flow hydrodynamics are investigated as well in the present study, considering the slug length and slug velocity. Based on the present experimental results, a new scaling law is proposed to predict the slug length and it shows a good agreement with the experimental results. It has been widely reported that slug velocities depend linearly on the total flow rates of the two phases, which is consistent with the present study. The linear law provides a good prediction of the experimental slug velocities but different slopes are suggested in microchannels with different hydraulic diameters.

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Hameed, M. Saqib, Zheng Li et Kaihong Zheng. « Damage Size Estimation for Composite Laminates Based on an Anisotropic Wavefront Expression ». Dans ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23549.

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Abstract A Multistage Elliptical Parametric (MEP) method is developed in this research for damage size evaluation in anisotropic composite laminates. The Lamb waves are actuated and sensed using piezoelectric (lead zirconate titanate, PZT) transducers arranged as a network of square cells. The dynamic response signals are processed using a continuous wavelet transformation (CWT) based on the Gabor wavelet for accurate time of flight (ToF) measurements. A numerical method is developed for the construction of non-elliptic path loci for each actuator-sensor pair. The damage is localized first using the least squares method, and then the damage edge points are located on each non-elliptic path loci as points which have the minimum distance from the damage location. The MEP method based on the damage edge points is implemented in multiple stages for damage size evaluation in a cross-ply laminate. Each stage is designed on the basis on excitation of specific prearranged transducers inside the square cell. The results indicate that the MEP method can quantitatively estimate the size of an elliptical damage in cross-ply laminates.

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He, Jianfeng, Bingpeng Ma, Shuhui Wang, Yugui Liu et Qingming Huang. « Cross-modal Retrieval by Real Label Partial Least Squares ». Dans MM '16 : ACM Multimedia Conference. New York, NY, USA : ACM, 2016. http://dx.doi.org/10.1145/2964284.2967216.

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Virone, Giuseppe, G. Addamo, R. Tascone, O. A. Peverini, Federico Perini, Marco Schiaffino, G. Naldi, Jader Monari et Stelio Montebugnoli. « Electromagnetic Design of Broadband Antenna Feed Systems for the Northern Cross Radio Telescope ». Dans Wide Field Astronomy & Technology for the Square Kilometre Array. Trieste, Italy : Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.132.0064.

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Rapports d'organisations sur le sujet "Crossed squares"

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Badami, Kaswan, Budi Setiadi Daryono, Achmad Amzeri et Syaiful Khoiri. COMBINING ABILITY AND HETEROTIC STUDIES ON HYBRID MELON (Cucumis melo L.) POPULATIONS FOR FRUIT YIELD AND QUALITY TRAITS. SABRAO Journal of Breeding and Genetics, octobre 2020. http://dx.doi.org/10.21107/amzeri.2020.3.

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In different crop plants, combining ability and heterosis are used as important diagnostic tools for assessing the performance of parental genotypes and their hybrids. This research aimed to evaluate heterotic and combining ability effects in the diallel crosses of melon (Cucumis melo L.) for yield- and quality-related traits. Seven melon (C. melo L.) genotypes were grown and crossed in a complete diallel fashion to produce F1 hybrids. During the 2019 crop season, 49 melon genotypes (7 parents + 42 F1 hybrids) were grown in a randomized complete block design with three replications. Observations were made for seven characters. Analysis of variance revealed significant (P ≤ 0.01) differences among the melon genotypes for harvest age, fruit flesh thickness, fruit total soluble solids, fruit length, and fruit diameter and merely significant differences (P ≤ 0.05) for fruit weight. Combining ability analysis revealed that mean squares due to general combining ability (GCA) were significant for fruit diameter but were nonsignificant for all other traits. However, mean squares due to specific combining ability (SCA) were significant for all traits. The parental genotypes PK-165, PK-464, and PK-669 exhibited the highest and desirable GCA effects for yield and quality traits. Hence, these genotypes could be used to generate high-yielding hybrid/open-pollinated cultivars. GCA:SCA ratios further revealed that the traits of harvest age, fruit flesh thickness, fruit total soluble solids, fruit length, and fruit weight were controlled by dominant gene action, whereas fruit diameter was managed by additive and dominant genes. The majority of the traits were controlled by nonadditive gene action, verifying that the said breeding material could be efficiently used for the production of hybrid cultivars on the basis of heterotic effects.

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Hall, P., et J. S. Marron. Extent to which Least-Squares Cross-Validation Minimises Integrated Square Error in Nonparametric Density Estimation. Fort Belvoir, VA : Defense Technical Information Center, février 1985. http://dx.doi.org/10.21236/ada153789.

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Krane, John. The ratio of inclusive jet cross sections at square √s = 630 GeV and square √s = 1800 GeV. Office of Scientific and Technical Information (OSTI), janvier 1998. http://dx.doi.org/10.2172/3125.

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Hahn, Ki Suk. Multijet cross section ratios in p$\bar{p}$ collisions at square √s = 1.8 TeV. Office of Scientific and Technical Information (OSTI), janvier 1999. http://dx.doi.org/10.2172/3118.

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Vlimant, Jean-Roch. Measurement of cross section of production of pairs of top quarks /anti-signal in proton/anti-proton collisions at the square root of 1.96 TeV. Office of Scientific and Technical Information (OSTI), juin 2005. http://dx.doi.org/10.2172/1415853.

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Lines, Lisa M., Marque C. Long, Jamie L. Humphrey, Crystal T. Nguyen, Suzannah Scanlon, Olivia K. G. Berzin, Matthew C. Brown et Anupa Bir. Artificially Intelligent Social Risk Adjustment : Development and Pilot Testing in Ohio. RTI Press, septembre 2022. http://dx.doi.org/10.3768/rtipress.2022.rr.0047.2209.

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Prominent voices have called for a better way to measure, predict, and adjust for social factors in healthcare and population health. Local area characteristics are sometimes framed as a proxy for patient characteristics, but they are often independently associated with health outcomes. We have developed an “artificially intelligent” approach to risk adjustment for local social determinants of health (SDoH) using random forest models to understand life expectancy at the Census tract level. Our Local Social Inequity score draws on more than 150 neighborhood-level variables across 10 SDoH domains. As piloted in Ohio, the score explains 73 percent of the variation in life expectancy by Census tract, with a mean squared error of 4.47 years. Accurate multidimensional, cross-sector, small-area social risk scores could be useful in understanding the impact of healthcare innovations, payment models, and SDoH interventions in communities at higher risk for serious illnesses and diseases; identifying neighborhoods and areas at highest risk of poor outcomes for better targeting of interventions and resources; and accounting for factors outside of providers’ control for more fair and equitable performance/quality measurement and reimbursement.

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Anderson, Gerald L., et Kalman Peleg. Precision Cropping by Remotely Sensed Prorotype Plots and Calibration in the Complex Domain. United States Department of Agriculture, décembre 2002. http://dx.doi.org/10.32747/2002.7585193.bard.

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This research report describes a methodology whereby multi-spectral and hyperspectral imagery from remote sensing, is used for deriving predicted field maps of selected plant growth attributes which are required for precision cropping. A major task in precision cropping is to establish areas of the field that differ from the rest of the field and share a common characteristic. Yield distribution f maps can be prepared by yield monitors, which are available for some harvester types. Other field attributes of interest in precision cropping, e.g. soil properties, leaf Nitrate, biomass etc. are obtained by manual sampling of the filed in a grid pattern. Maps of various field attributes are then prepared from these samples by the "Inverse Distance" interpolation method or by Kriging. An improved interpolation method was developed which is based on minimizing the overall curvature of the resulting map. Such maps are the ground truth reference, used for training the algorithm that generates the predicted field maps from remote sensing imagery. Both the reference and the predicted maps are stratified into "Prototype Plots", e.g. 15xl5 blocks of 2m pixels whereby the block size is 30x30m. This averaging reduces the datasets to manageable size and significantly improves the typically poor repeatability of remote sensing imaging systems. In the first two years of the project we used the Normalized Difference Vegetation Index (NDVI), for generating predicted yield maps of sugar beets and com. The NDVI was computed from image cubes of three spectral bands, generated by an optically filtered three camera video imaging system. A two dimensional FFT based regression model Y=f(X), was used wherein Y was the reference map and X=NDVI was the predictor. The FFT regression method applies the "Wavelet Based", "Pixel Block" and "Image Rotation" transforms to the reference and remote images, prior to the Fast - Fourier Transform (FFT) Regression method with the "Phase Lock" option. A complex domain based map Yfft is derived by least squares minimization between the amplitude matrices of X and Y, via the 2D FFT. For one time predictions, the phase matrix of Y is combined with the amplitude matrix ofYfft, whereby an improved predicted map Yplock is formed. Usually, the residuals of Y plock versus Y are about half of the values of Yfft versus Y. For long term predictions, the phase matrix of a "field mask" is combined with the amplitude matrices of the reference image Y and the predicted image Yfft. The field mask is a binary image of a pre-selected region of interest in X and Y. The resultant maps Ypref and Ypred aremodified versions of Y and Yfft respectively. The residuals of Ypred versus Ypref are even lower than the residuals of Yplock versus Y. The maps, Ypref and Ypred represent a close consensus of two independent imaging methods which "view" the same target. In the last two years of the project our remote sensing capability was expanded by addition of a CASI II airborne hyperspectral imaging system and an ASD hyperspectral radiometer. Unfortunately, the cross-noice and poor repeatability problem we had in multi-spectral imaging was exasperated in hyperspectral imaging. We have been able to overcome this problem by over-flying each field twice in rapid succession and developing the Repeatability Index (RI). The RI quantifies the repeatability of each spectral band in the hyperspectral image cube. Thereby, it is possible to select the bands of higher repeatability for inclusion in the prediction model while bands of low repeatability are excluded. Further segregation of high and low repeatability bands takes place in the prediction model algorithm, which is based on a combination of a "Genetic Algorithm" and Partial Least Squares", (PLS-GA). In summary, modus operandi was developed, for deriving important plant growth attribute maps (yield, leaf nitrate, biomass and sugar percent in beets), from remote sensing imagery, with sufficient accuracy for precision cropping applications. This achievement is remarkable, given the inherently high cross-noice between the reference and remote imagery as well as the highly non-repeatable nature of remote sensing systems. The above methodologies may be readily adopted by commercial companies, which specialize in proving remotely sensed data to farmers.

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Cooper, Christopher, Jacob McDonald et Eric Starkey. Wadeable stream habitat monitoring at Congaree National Park : 2018 baseline report. National Park Service, juin 2021. http://dx.doi.org/10.36967/nrr-2286621.

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The Southeast Coast Network (SECN) Wadeable Stream Habitat Monitoring Protocol collects data to give park resource managers insight into the status of and trends in stream and near-channel habitat conditions (McDonald et al. 2018a). Wadeable stream monitoring is currently implemented at the five SECN inland parks with wadeable streams. These parks include Horseshoe Bend National Military Park (HOBE), Kennesaw Mountain National Battlefield Park (KEMO), Ocmulgee Mounds National Historical Park (OCMU), Chattahoochee River National Recreation Area (CHAT), and Congaree National Park (CONG). Streams at Congaree National Park chosen for monitoring were specifically targeted for management interest (e.g., upstream development and land use change, visitor use of streams as canoe trails, and potential social walking trail erosion) or to provide a context for similar-sized stream(s) within the park or network (McDonald and Starkey 2018a). The objectives of the SECN wadeable stream habitat monitoring protocol are to: Determine status of upstream watershed characteristics (basin morphology) and trends in land cover that may affect stream habitat, Determine the status of and trends in benthic and near-channel habitat in selected wadeable stream reaches (e.g., bed sediment, geomorphic channel units, and large woody debris), Determine the status of and trends in cross-sectional morphology, longitudinal gradient, and sinuosity of selected wadeable stream reaches. Between June 11 and 14, 2018, data were collected at Congaree National Park to characterize the in-stream and near-channel habitat within stream reaches on Cedar Creek (CONG001, CONG002, and CONG003) and McKenzie Creek (CONG004). These data, along with the analysis of remotely sensed geographic information system (GIS) data, are presented in this report to describe and compare the watershed-, reach-, and transect-scale characteristics of these four stream reaches to each other and to selected similar-sized stream reaches at Ocmulgee Mounds National Historical Park, Kennesaw Mountain National Battlefield Park, and Chattahoochee National Recreation Area. Surveyed stream reaches at Congaree NP were compared to those previously surveyed in other parks in order to provide regional context and aid in interpretation of results. edar Creek’s watershed (CONG001, CONG002, and CONG003) drains nearly 200 square kilometers (77.22 square miles [mi2]) of the Congaree River Valley Terrace complex and upper Coastal Plain to the north of the park (Shelley 2007a, 2007b). Cedar Creek’s watershed has low slope and is covered mainly by forests and grasslands. Cedar Creek is designated an “Outstanding Resource Water” by the state of South Carolina (S.C. Code Regs. 61–68 [2014] and S.C. Code Regs. 61–69 [2012]) from the boundary of the park downstream to Wise Lake. Cedar Creek ‘upstream’ (CONG001) is located just downstream (south) of the park’s Bannister Bridge canoe landing, which is located off Old Bluff Road and south of the confluence with Meyers Creek. Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ (CONG002 and CONG003, respectively) are located downstream of Cedar Creek ‘upstream’ where Cedar Creek flows into the relatively flat backswamp of the Congaree River flood plain. Based on the geomorphic and land cover characteristics of the watershed, monitored reaches on Cedar Creek are likely to flood often and drain slowly. Flooding is more likely at Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ than at Cedar Creek ‘upstream.’ This is due to the higher (relative to CONG001) connectivity between the channels of the lower reaches and their out-of-channel areas. Based on bed sediment characteristics, the heterogeneity of geomorphic channel units (GCUs) within each reach, and the abundance of large woody debris (LWD), in-stream habitat within each of the surveyed reaches on Cedar Creek (CONG001–003) was classified as ‘fair to good.’ Although, there is extensive evidence of animal activity...

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