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Literatura académica sobre el tema "Cube partiel"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Cube partiel"

Chepoi, Victor, Kolja Knauer y Tilen Marc. "Hypercellular graphs: Partial cubes without Q3− as partial cube minor". Discrete Mathematics 343, n.º 4 (abril de 2020): 111678. http://dx.doi.org/10.1016/j.disc.2019.111678.

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D, Raghavendra Prasad H., Nagaraj Sitaram, Pavan P. S y Dushyanth V. BABU R. "Economical Concrete Cube Prepared Using Different Types of Nano-Material for Sustainable Construction". ECS Transactions 107, n.º 1 (24 de abril de 2022): 10509–17. http://dx.doi.org/10.1149/10701.10509ecst.

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In this research work concrete cube has been prepared by doing partial replacement for cement using nano materials like Multi-Walled Carbon Nano Tubes (MWCNTs), titanium dioxide (TiO2), and copper oxide (CuO) at different percentages like 0.1, 0.25, and 0.5%. Basic test has been done for materials and fresh concrete, followed by compressive strength test for concrete cubes. MWCNT gives more result compare to TiO2 and CuO. Just to reduce cement usage, fly ash has been used by keeping the compressive strength and the amount of nano materials as constant up to 35% of MWCNTs, TiO2, and CuO, with fly ash replaced for cement to obtain the normal strength. Cost analysis has been done to find out the economic efficiency of nano material concrete cube due to which TiO2 with fly ash cost 14.45Rs to prepare single cube, as MWCNTs and CuO with fly ash cost 726.4 and 17.64Rs to prepare single concrete cube. Almost TiO2 cube preparation took 10% reduction for the preparation of concrete cube compare to normal concrete cube has taken 15.96Rs. So we concluded that TiO2 with fly ash nano material concrete is the economical efficient concrete compared to MWCNTs and CuO with fly ash.

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Chellew, Guylaine y M. A. Persinger. "Women but Not Men Exhibit a Positive Correlation between Complex Partial Epileptic-Like Signs and Tactile-Visual Cross-Modal Matching: Implications for Hemispheric Intercalation". Perceptual and Motor Skills 78, n.º 3_suppl (junio de 1994): 1312–14. http://dx.doi.org/10.2466/pms.1994.78.3c.1312.

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16 right-handed men and 19 women were asked to feel various sized wooden cubes with the dominant hand for 2 sec. (without visual feedback) and then to select this cube from a random visual arrangement of cubes (tactile-visual matching) after a brief delay. The accuracy for men and women for this task did not differ significantly; however, the accuracy was significantly correlated ( rho = 0.61) with a history of complex partial epileptic-like signs for the women but not for the men. The results support the hypothesis that elevated scores for complex partial epileptic-like signs in right-handed women enhance their capacity to associate different perceptual domains of the same stimuli because there is elevated activity within the (multimodal) hippo-campal-amygdaloid system (sensory-limbic hyperconnectionism) and the correlative enhanced intercalation between the right and left temporoparietal lobes.

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O. Ngonadi, Lilian y Francis C. Eze. "Some Optimality Variations of Central Composite Designs". Academic Journal of Applied Mathematical Sciences, n.º 54 (15 de abril de 2019): 32–42. http://dx.doi.org/10.32861/ajams.54.32.42.

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Some variations of central composite designs (CCD) under complete and partial replications of cube, axial and center points are studied using A, D and G optimality criteria. The results obtained suggest that complete replication of the cube, axial and center points are better than the partial replication of cube, axial and center points under the A and D optimality criteria studied while it varies under G optimality criterion. The partial replication of the cube, axial and center point for all the CCDs studied, the partial replicated cube point is D optimal but varies under A and G optimality criteria.

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Balpande, Ajinkya. "An Experimental Study on Partial Replacement of GGBS with Cement and Utilizing Demolished Coarse Aggregate in Concrete". International Journal for Research in Applied Science and Engineering Technology 11, n.º 6 (30 de junio de 2023): 41–47. http://dx.doi.org/10.22214/ijraset.2023.53608.

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bstract: The majority of municipal solid wastes are made up of debris from construction and demolition projects, including recycled construction aggregate (RCA). This paper presents the findings of an experimental and analytical examination of the creation of environmentally friendly concrete. It is a good idea to replace natural material with aggregate from old, demolished structures to reduce debris and preserve the environment. To reduce consumption, recycled aggregate can be utilized in place of natural aggregate. To address these issues, an attempt is undertaken in the current experimental work to substitute GGBS in varied proportions for cement. The purpose of this research is to demonstrate the findings of an investigation into the applicability of GGBS in the manufacturing of concrete by using construction and demolition debris as a recycled resource. Ground granulated blast furnace slag (GGBS) and recycled concrete aggregates are the recycled materials employed in this study. A concrete mix of grade M25 was created through the mix design process. GGBS was partially replaced with wastedestroyed aggregate in the amounts of 0, 10, 20, 30, and 40% to create the mixes. Cubes of 150x150x150mm3 were poured. The compressive strength of the concrete cube specimens was measured by smashing the cube after 7, 14, 28, 60, and 90 days of curing for various curing intervals. The compression test results on the cubes show that strength increases with the amount of slag added up to the maximum value. Compressive strength was seen to grow when GGBS content increased up to 30%, but after the replacement level was above 30%, strength began to deteriorate. The outcomes of GGBS with conventional concrete and concrete made entirely of demolished aggregate without GGBS are compared to the outcomes of GGBS with concrete containing demolished aggregate

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.K.M, Ms Jayakumari. "Experimental Study on Compressive Strength of the Cement Mortar Cubes with Partial Replacement of Fine Aggregate Using Polyvinyl Chloride (PVC) Plastic". INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, n.º 04 (27 de abril de 2024): 1–5. http://dx.doi.org/10.55041/ijsrem31851.

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Mortar is a material that consists of cement and sand with a range of applications in the construction industry. However, the plain mortar materials are usually brittle and often crack and fail more suddenly than reinforced mortar. This experimental study is about the compressive strength of cement mortar stabilised with the use of the polyvinyl chloride (PVC) plastic powder. Generally the compressive strength of cement mortar of mix proportion (1:3) is 33 N/mm² to 53 N/mm² has been obtained after 28 days curing. The cement mortar ratio is 1: 3 respectively. The PVC powder is added along with the sand with percentages of 0%, 2.5%, 5%, 7.5%, 10% respectively. And the water cement ratio is 0.5 with volume. The moulds of 70×70×70 mm size were used for the cube test, and the cubes were tested on the Compressive testing machine to determine the strength of cube for 3, 7, 28 days of time period respectively. The main aim of f this study to determine the compressive strength of cement mortar (1:3) of sand added with PVC powder, Key Words:- Waste Plastic, Polyvinyl Chloride, Compressive Strength, Mortar.

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Nwankwo, P. O., U. N. Wilson y Z. Danbuba. "THE FIRE RESISTANCE OF CONCRETE MADE WITH RECYCLED PLASTIC AS PARTIAL REPLACEMENT FOR COARSE AGGREGATE". Malaysian Journal of Civil Engineering 34, n.º 2 (27 de julio de 2022): 11–18. http://dx.doi.org/10.11113/mjce.v34.18309.

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This research is aimed to investigate the fire resistance of recycled discarded plastic when used as partial replacement for normal granite coarse aggregate in concrete when exposed to elevated temperatures. Discarded Polyethylene Terephthalate (PET) bottles were cut into a maximum size of 20mm to produce Recycled Plastic Aggregate (RPA). The replacement of normal aggregates with RPA were in proportion of 0%, 5%, 10%, 15%, 20%, 25% and 30% by weight of normal coarse aggregate. The compressive performance of the concrete made with RPA were studied by casting three 100 mm cubes for each of the percentage replacements and tested at 7, 14 and 28 days of curing age. A set of three (3) concrete cubes for each percentage replacement was cured for 28 days and subjected to a temperature of 718oC for a duration of 15 minutes in a furnace. Results of slump tests on fresh concrete showed that workability decreased with increase in RPA. Densities and compressive strengths for normal cube samples not subjected to elevated temperatures and the sample subjected to temperature of 718oC increased with increase in curing age and decreased with increase in percentage of RPA. The result showed that the concrete specimen with 10% replacement of RPA was optimum for good thermal stability.

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Lindner, Peter, Sachin Basil John, Christoph Koch y Dan Suciu. "The Moments Method for Approximate Data Cube Queries". Proceedings of the ACM on Management of Data 2, n.º 2 (10 de mayo de 2024): 1–23. http://dx.doi.org/10.1145/3651147.

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We investigate an approximation algorithm for various aggregate queries on partially materialized data cubes. Data cubes are interpreted as probability distributions, and cuboids from a partial materialization populate the terms of a series expansion of the target query distribution. Unknown terms in the expansion are just assumed to be 0 in order to recover an approximate query result. We identify this method as a variant of related approaches from other fields of science, that is, the Bahadur representation and, more generally, (biased) Fourier expansions of Boolean functions. Existing literature indicates a rich but intricate theoretical landscape. Focusing on the data cube application, we start by investigating worst-case error bounds. We build upon prior work to obtain provably optimal materialization strategies with respect to query workloads. In addition, we propose a new heuristic method governing materialization decisions. Finally, we show that well-approximated queries are guaranteed to have well-approximated roll-ups.

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Lee, Kyoung Jin y Richard L. Gibson. "An improved mesh generation scheme for the wavefront construction method". GEOPHYSICS 72, n.º 1 (enero de 2007): T1—T8. http://dx.doi.org/10.1190/1.2399366.

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Wavefront construction is an effective tool for the rapid calculation of ray fields in anisotropic media. The method explicitly tracks the propagation of a wavefront through a model, mapping it to a computational mesh that is interpolated when accuracy criteria based on paraxial ray methods are violated. Takeoff angles are used often to define the initial ray directions, but uniform sampling in the two angles leads to oversampling of the ray field in the direction of the axis. Such sampling can lead also to numerical instability associated with vanishing derivatives with respect to the azimuthal angle. We suggest a new wavefront mesh definition using the cubed-sphere mesh, which is a coordinate system used to solve partial differential equations in spherical geometries. When using this mesh, ray directions are assigned by mapping points on a regular discretization of the faces of a cube surrounding the source to corresponding rays. This scheme produces a nearly uniform distribution of rays with minimal effort and using the cubed-sphere coordinates as ray parameters to calculate partial derivatives completely eliminates the singularities that arise when takeoff angles are used as ray parameters. Numerical results for quantities related to seismic amplitudes confirm that this new mesh does provide more stable and reliable results.

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Tesis sobre el tema "Cube partiel"

Philibert, Manon. "Cubes partiels : complétion, compression, plongement". Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0403.

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Les sous-graphes isométriques d'hypercubes (dit cubes partiels) constituent une classe centrale de la théorie métrique des graphes. Ils englobent des familles de graphes importantes (arbres, graphes médians, etc.), provenant de différents domaines de recherche, tels que la géométrie discrète, la combinatoire ou la théorie géométrique des groupes. Nous étudions tout d'abord la structure des cubes partiels de VC-dimension 2. Nous montrons que ces graphes peuvent être obtenus par amalgamations à partir de deux types de cellules combinatoires.Cette décomposition nous permet d’obtenir diverses caractérisations. En particulier, tout cube partiel de VC-dimension 2 peut être complété en cube partiel ample de VC-dimension 2. Nous montrons ensuite que les graphes de topes des matroïdes orientés et des complexes de matroïdes orientés uniformes peuvent aussi être complétés en cubes partiels amples de même VC-dimension.En utilisant un résultat de Moran et Warmuth, nous établissons que ces classes vérifient la conjecture de Floyd et Warmuth, l'une des plus vielles conjectures en théorie de l'apprentissage. C'est-à-dire qu'elles admettent des schémas de compression (étiquetés non propres) de taille leur VC-dimension.Par la suite, nous décrivons un schéma de compression étiqueté propre de taille d pour les complexes de matroïdes orientés de VC-dimension d, généralisant ainsi le résultat de Moran et Warmuth pour les amples. Enfin, nous fournissons une caractérisation par pc-mineurs exclus et parsous-graphes isométriques interdits des cubes partiels plongeables isométriquement dans la grille Z^2 et dans le cylindre P_n \square C_{2k} pour un certain n et k > 4
Partial cubes (aka isometric subgraphs of hypercubes) are a fundamental class of metric graph theory. They comprise many important graph classes (trees, median graphs, tope graphs of complexes of oriented matroids, etc.), arising from different areas of research such as discrete geometry, combinatorics or geometric group theory.First, we investigate the structure of partial cubes of VC-dimension 2. We show that those graphs can be obtained via amalgams from even cycles and full subdivisions of complete graphs. This decomposition allows us to obtain various characterizations. In particular, any partial cube can be completed to an ample partial cube of VC-dimension 2. Then, we show that the tope graphs of oriented matroids and complexes of uniform oriented matroids can also be completed to ample partial cubes of the same VC-dimension.Using a result of Moran and Warmuth, we establish that those classes satisfy the conjecture of Floyd and Warmuth, one of the oldest open problems in computational machine learning. Particularly, they admit (improper labeled) compression schemes of size their VC-dimension.Next, we describe a proper labeled compression scheme of size d for complexes of oriented matroids of VC-dimension d, generalizing the result of Moran and Warmuth for ample sets. Finally, we give a characterization via excluded pc-minors and via forbidden isometric subgraphs of partial cubes isometrically embedded into the grid \mathbb{Z}^2 and the cylinder P_n \square C_{2k} for some n and k > 4

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Murthy, Siva Ram C. "A Broadcast Cube-Based Multiprocessor Architecture for Solving Partial Differential Equations". Thesis, Indian Institute of Science, 1998. http://hdl.handle.net/2005/44.

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Indian Institute of Science
A large number of mathematical models in engineering and physical sciences employ Partial Differential Equations (PDEs). The sheer number of operations required in numerically integrating PDEs in these applications has motivated the search for faster methods of computing. The conventional uniprocessor computers are often unable to fulfill the performance requirements for these computation intensive problems. In this dissertation, a cost-effective message-based multiprocessor system which we call the Broadcast Cube System (BCS) has been proposed for solving important computation intensive problems such as, systems of linear algebraic equations and PDEs. A simulator for performance evaluation of parallel algorithms to be executed on the BCS has been implemented. A strategy (task assignment . algorithm) for assigning program tasks with precedence and communication constraints to the Processing Elements (PEs) in the BCS has been developed and its effectiveness demonstrated. This task assignment algorithm has been shown to produce optimal assignments for PDE problems. Optimal partitioning of the problems, solving systems of linear algebraic equations and PDEs, into tasks and their assignment to the PEs in the BCS have been given. Efficient parallel algorithms for solving these problems on the BCS have been designed. The performance of the parallel algorithms has been evaluated by both analytical and simulation methods. The results indicate that the BCS is highly effective in solving systems of linear algebraic equations and PDEs. The performance of these algorithms on the BCS has also been compared with that of their implementations on popular hypercube machines. The results show that the performance of the BCS is better than that of the hypercubes for linear algebraic equations and compares very well for PDEs, with a modest number of PEs despite the constant PE connectivity of three in the BCS. Finally, the effectiveness of the BCS in solving non-linear PDEs occurring in two important practical problems, (i) heat transfer and fluid flow simulation and (ii) global weather modeling, has been demonstrated.

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Murthy, Siva Ram C. "A Broadcast Cube-Based Multiprocessor Architecture for Solving Partial Differential Equations". Thesis, Indian Institute of Science, 1988. https://etd.iisc.ac.in/handle/2005/3922.

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A large number of mathematical models in engineering and physical sciences employ Partial Differential Equations (PDEs). The sheer number of operations required in numerically integrating PDEs in these applications has motivated the search for faster methods of computing. The conventional uniprocessor computers are often unable to fulfill the performance requirements for these computation intensive problems. In this dissertation, a cost-effective message-based multiprocessor system which we call the Broadcast Cube System (BCS) has been proposed for solving important computation intensive problems such as, systems of linear algebraic equations and PDEs. A simulator for performance evaluation of parallel algorithms to be executed on the BCS has been implemented. A strategy (task assignment . algorithm) for assigning program tasks with precedence and communication constraints to the Processing Elements (PEs) in the BCS has been developed and its effectiveness demonstrated. This task assignment algorithm has been shown to produce optimal assignments for PDE problems. Optimal partitioning of the problems, solving systems of linear algebraic equations and PDEs, into tasks and their assignment to the PEs in the BCS have been given. Efficient parallel algorithms for solving these problems on the BCS have been designed. The performance of the parallel algorithms has been evaluated by both analytical and simulation methods. The results indicate that the BCS is highly effective in solving systems of linear algebraic equations and PDEs. The performance of these algorithms on the BCS has also been compared with that of their implementations on popular hypercube machines. The results show that the performance of the BCS is better than that of the hypercubes for linear algebraic equations and compares very well for PDEs, with a modest number of PEs despite the constant PE connectivity of three in the BCS. Finally, the effectiveness of the BCS in solving non-linear PDEs occurring in two important practical problems, (i) heat transfer and fluid flow simulation and (ii) global weather modeling, has been demonstrated.
Indian Institute of Science

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Tregnier, Claude. "Fins de parties : identification dans le transfert et achoppement de cure psychothérapeutique". Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05H124.

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La thèse traite des arrêts non éclairés de cure psychothérapeutique, c'est-à-dire des interruptions définitives à l'initiative exclusive du patient ou de la patiente, sans discussion avec le clinicien ou la clinicienne. Pour la première fois, une telle étude est basée sur des témoignages de patient(e)s, recueillis lors d'entretiens cliniques après consentement éclairé. Au plan théorique, l'étude s'appuie sur une approche métapsychologique informationnelle originale de la psyché comme organe de modélisation du monde par la réalité psychique, inspirée par un historique de l'évolution des notions de projection et d'identification projective en psychanalyse. Pour l'ensemble du panel clinique de l'étude, les arrêts non éclairés de cure résultent systématiquement de la perte de confiance du patient en raison d'un trait disqualifiant imputé au clinicien par transfert objectal ou par identification projective, avec une conviction remarquablement forte, inébranlable et durable que le trait en question appartient effectivement à la personne du clinicien. Au terme de l'étude, il apparaît que les personnes ayant traversé des expériences traumatiques relationnelles dans leur enfance (rupture de continuité relationnelle avec l'environnement parental) pourraient être particulièrement exposées aux risques d'arrêts non éclairés lorsqu'elles entreprennent une psychanalyse ou une psychothérapie. En conséquence, l'étude propose des mesures de métacommunication préventive et curative visant à réduire un tel risque. Ces conclusions nécessiteraient d'être affinées par une recherche ultérieure plus large incluant notamment une comparaison avec une population témoin de patient(e)s n'ayant pas connu d'arrêts non éclairés dans leur(s) cure(s), afin de préciser davantage les spécificités des patient(e)s qui en provoquent et de mieux caractériser les traumatismes relationnels précoces dont ces dernier(e)s ont pu faire l'expérience
This work is about unilateral treatment abortions by the patient, occurring without preliminary discussion with the therapist. For the first time, such a research is based upon testimonies from patients collected during clinical interviews with their informed consent. Theoretically, the study relies on an original informational approach of the psyche as an organ which models the outside world by the psychical reality, approach inspired by an historical survey of projection and projective identification psychoanalytical concepts evolutions. For the entire study sample, unilateral treatment abortion by the patient always derives from loss of confidence in the therapist caused by the attribution to him or her of a disqualifying feature through object transference or projective identification channel, with a remarkably strong, unwavering and long-lasting conviction that the disqualifying feature truly belongs to the therapist. At the end of the study, it appears that the persons who have had relational traumatic experiences during childhood (breaks in the continuity of relations with parental environment) would be particularly prone to unilateral treatment abortions during a psychoanalysis or a psychotherapy. Consequently, the study proposes preventive and curatives measures of metacommunication in order to reduce risk of treatment abortion. The conclusions of this study would require further wider research, involving particularly a control population of patients who never experimented unilateral treatment abortion during their psychoanalysis/psychotherapy, in order to more clearly identify the specificities of the patients who provoke such treatment abortions and the exact nature of the relational trauma which they may have experimented during childhood

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Brito, Julian Araujo. "Cuba em transformação: socialismo e as reformas econômicas do 6 Congresso do Partido Comunista". Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=9160.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
Esta dissertação reflete sobre os dilemas do socialismo contemporâneo a partir da experiência revolucionária cubana, focalizando especialmente a etapa conhecida como "atualização do socialismo". Em 2011 o VI Congresso do Partido Comunista de Cuba aprovou um conjunto de reformas econômicas cuja meta proclamada é a "atualização do modelo econômico e social" do país. Nestes termos, a proposta central do governo aponta para a diversificação dos atores econômicos e maiores níveis de descentralização, entretanto, sem abrir mão do predomínio da propriedade estatal sobre os meios de produção e da planificação sobre o mercado. Por outro lado, inegavelmente, essas medidas trazem mudanças significativas em relação ao modelo socialista historicamente construído em Cuba. Visando entender esse processo de transformações, o presente trabalho abordará os aspectos políticos e teóricos destas reformas.
Esta tesis de maestría reflexiona sobre los dilemas del socialismo contemporáneo desde la experiencia revolucionaria cubana, focalizando especialmente la etapa conocida como actualización del socialismo. En 2011 el VI Congreso del Partido Comunista de Cuba aprobó un conjunto de reformas económicas con la cual se ha proclamado la meta de "actualizar el modelo económico y social" del país. Así, la propuesta central del gobierno apunta para la diversificación de los actores económicos y mayores niveles de descentralización, sin embargo, manteniendo el predominio de la propiedad estatal sobre los medios de producción y la planificación sobre el mercado. Por otra parte, no hay como negar que estas medidas implican cambios significativos en el modelo socialista históricamente construido en Cuba. Buscando entender este proceso de cambios, el presente trabajo abordará los aspectos políticos y teóricos de estas reformas.

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Ahmed, Usman. "Dynamic cubing for hierarchical multidimensional data space". Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00876624.

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Data warehouses are being used in many applications since quite a long time. Traditionally, new data in these warehouses is loaded through offline bulk updates which implies that latest data is not always available for analysis. This, however, is not acceptable in many modern applications (such as intelligent building, smart grid etc.) that require the latest data for decision making. These modern applications necessitate real-time fast atomic integration of incoming facts in data warehouse. Moreover, the data defining the analysis dimensions, stored in dimension tables of these warehouses, also needs to be updated in real-time, in case of any change. In this thesis, such real-time data warehouses are defined as dynamic data warehouses. We propose a data model for these dynamic data warehouses and present the concept of Hierarchical Hybrid Multidimensional Data Space (HHMDS) which constitutes of both ordered and non-ordered hierarchical dimensions. The axes of the data space are non-ordered which help their dynamic evolution without any need of reordering. We define a data grouping structure, called Minimum Bounding Space (MBS), that helps efficient data partitioning of data in the space. Various operators, relations and metrics are defined which are used for the optimization of these data partitions and the analogies among classical OLAP concepts and the HHMDS are defined. We propose efficient algorithms to store summarized or detailed data, in form of MBS, in a tree structure called DyTree. Algorithms for OLAP queries over the DyTree are also detailed. The nodes of DyTree, holding MBS with associated aggregated measure values, represent materialized sections of cuboids and tree as a whole is a partially materialized and indexed data cube which is maintained using online atomic incremental updates. We propose a methodology to experimentally evaluate partial data cubing techniques and a prototype implementing this methodology is developed. The prototype lets us experimentally evaluate and simulate the structure and performance of the DyTree against other solutions. An extensive study is conducted using this prototype which shows that the DyTree is an efficient and effective partial data cubing solution for a dynamic data warehousing environment.

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Caldwell, Mary Kathryn. "Characterization of Epoxy-hybrid nano-particle Resins for ambient cure VARTM Processes". NCSU, 2007. http://www.lib.ncsu.edu/theses/available/etd-04232007-163012/.

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This thesis presents the mechanical characterization of fire resistant epoxy-hybrid resin systems suitable for ambient cure VARTM processes. Several new epoxy-hybrid nano-particle resins were developed and tested for use in large scale composite structures. Based on the viscosity, Tg, and cure time requirements twelve of these resins systems were pre-selected for mechanical testing. Neat resin castings were tested in tension to determine the elastic modulus, tensile strength and maximum elongation. From these results, six of the resin systems were further cast in unidirectional glass fiber laminates. Transverse tension and short beam shear testing was performed on all laminates to determine the mechanical properties of the glass/epoxy systems. Two of the epoxy-hybrid resin systems showed promising behaviors, having a higher transverse modulus and ultimate strength than the original benchmark vinyl-ester resin. Additionally, fiber Bragg grating sensors were embedded in one benchmark vinyl-ester laminate and one epoxy-hybrid laminate during the cure cycle. Taking advantage of both the extrinsic and intrinsic properties of these sensors, residual strains, temperature changes, and degree of cure of the resin were monitored. In addition to having a higher modulus of elasticity and ultimate strength, these new epoxy-hybrid nano-particle resin laminates showed minimal temperature increases during cure and smaller residual strains than the comparable vinyl-ester resin laminates.

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Garnaud, Eve. "Dépendances fonctionnelles : extraction et exploitation". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00951619.

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Les dépendances fonctionnelles fournissent une information sémantique sur les données d'une table en mettant en lumière les liens de corrélation qui les unient. Dans cette thèse, nous traitons du problème de l'extraction de ces dépendances en proposant un contexte unifié permettant la découverte de n'importe quel type de dépendances fonctionnelles (dépendances de clé, dépendances fonctionnelles conditionnelles, que la validité soit complète ou approximative). Notre algorithme, ParaCoDe, s'exécute en parallèle sur les candidats, réduisant ainsi le temps global de calcul. De ce fait, il est très compétitif vis-à-vis des approches séquentielles connues à ce jour. Les dépendances satisfaites sur une table nous servent à résoudre le problème de la matérialisation partielle du cube de données. Nous présentons une caractérisation de la solution optimale dans laquelle le coût de chaque requête est borné par un seuil de performance fixé préalablement et dont la taille est minimale. Cette spécification de la solution donne un cadre unique pour décrire et donc comparer formellement les techniques de résumé de cubes de données.

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Patsora, Iryna, Dmytro Tatarchuk, Henning Heuer y Susanne Hillmann. "Study of a Particle Based Films Cure Process by High-Frequency Eddy Current Spectroscopy". Multidisciplinary Digital Publishing Institute, 2016. https://tud.qucosa.de/id/qucosa%3A30206.

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Particle-based films are today an important part of various designs and they are implemented in structures as conductive parts, i.e., conductive paste printing in the manufacture of Li-ion batteries, solar cells or resistive paste printing in IC. Recently, particle based films were also implemented in the 3D printing technique, and are particularly important for use in aircraft, wind power, and the automotive industry when incorporated onto the surface of composite structures for protection against damages caused by a lightning strike. A crucial issue for the lightning protection area is to realize films with high homogeneity of electrical resistance where an in-situ noninvasive method has to be elaborated for quality monitoring to avoid undesirable financial and time costs. In this work the drying process of particle based films was investigated by high-frequency eddy current (HFEC) spectroscopy in order to work out an automated in-situ quality monitoring method with a focus on the electrical resistance of the films. Different types of particle based films deposited on dielectric and carbon fiber reinforced plastic substrates were investigated in the present study and results show that the HFEC method offers a good opportunity to monitor the overall drying process of particle based films. Based on that, an algorithm was developed, allowing prediction of the final electrical resistance of the particle based films throughout the drying process, and was successfully implemented in a prototype system based on the EddyCus® HFEC device platform presented in this work. This prototype is the first solution for a portable system allowing HFEC measurement on huge and uneven surfaces.

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Patsora, Iryna, Dmytro Tatarchuk, Henning Heuer y Susanne Hillmann. "Study of a Particle Based Films Cure Process by High-Frequency Eddy Current Spectroscopy". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-220609.

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Libros sobre el tema "Cube partiel"

Navarro Agüero, Enrique M., 1947- author, ed. Alma de la nación cubana. La Habana: Casa Editorial Verde Olivo, 2014.

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López, Onelio Ortega. Valor filosófico de los documentos del Partido Comunista de Cuba: Primer, segundo y tercer Congresos. La Habana: Editorial de Ciencias Sociales, 1990.

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Dávalos, Armando Hart. Cuba: Raíces del presente. Madrid: Ediciones Libertarias, 1999.

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Die Geschichte der kubanischen KP von 1925-1962. Frankfurt am Main: P. Lang, 1992.

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Aguilera, César Reynal. El soviet caribeño: La otra historia de la Revolución Cubana. Buenos Aires: B, 2018.

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Holly, Kate. Disney's Jungle Cubs. Racine, Wis: Golden Books Pub. Co., 1997.

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Art, Edwards, ed. Disney's Jungle Cubs. Racine, Wis: Golden Books Pub. Co., 1997.

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Partido Comunista de Cuba. Congreso, ed. Los fieles de Castro. Miami, Fla: Ediciones Cambio, 1991.

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Fidel, Castro. Informe central, discurso de clausura: V Congreso del Partido Comunista de Cuba. La Habana: Editora Politca, 1997.

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Fidel, Castro. Rapport central, discours de clôture: 5e Congrès du Parti Communiste de Cuba. La Habana: Editora Política, 1998.

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Capítulos de libros sobre el tema "Cube partiel"

Ovchinnikov, Sergei. "Partial Cubes". En Universitext, 127–81. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0797-3_5.

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Hanusse, Nicolas, Sofian Maabout y Radu Tofan. "Revisiting the Partial Data Cube Materialization". En Advances in Databases and Information Systems, 70–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23737-9_6.

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Cardinal, Jean y Stefan Felsner. "Covering Partial Cubes with Zones". En Lecture Notes in Computer Science, 1–13. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13287-7_1.

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Amaldi, Ugo. "Accelerators that Cure". En Particle Accelerators: From Big Bang Physics to Hadron Therapy, 213–45. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08870-9_8.

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Albenque, Marie y Kolja Knauer. "Convexity in Partial Cubes: The Hull Number". En LATIN 2014: Theoretical Informatics, 421–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54423-1_37.

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Lekkerkerker, Henk N. W., Remco Tuinier y Mark Vis. "Phase Behaviour of Colloidal Cubes Mixed with Depletants". En Colloids and the Depletion Interaction, 319–42. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-52131-7_10.

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AbstractIn Chaps. 8 and 9 it was shown that the phase behaviour of anisotropic hard particles is considerably richer than that of hard spheres (see Sect. 3.2). Recent breakthroughs in colloidal synthesis allow the control of particle shapes and properties with high precision. This provides us with a constantly expanding library of new anisotropic building blocks, thus opening new avenues to explore colloidal self-assembly at a higher level of complexity [1, 2]. One of these intriguing novel systems is cube-like colloids. In this chapter, a selective overview is given on the current knowledge of the phase behaviour of cube-like colloids with and without added depletants.

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Dehne, Frank, Todd Eavis y Andrew Rau-Chaplin. "Computing Partial Data Cubes for Parallel Data Warehousing Applications". En Recent Advances in Parallel Virtual Machine and Message Passing Interface, 319–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45417-9_44.

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Carter, Cynthia. "be cute, play with dolls, and stick to tea parties". En Journalism, Gender and Power, 236–50. London ; New York : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9781315179520-17.

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DeCarlo, Doug. "Towards Real-Time Cue Integration by Using Partial Results". En Computer Vision — ECCV 2002, 327–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-47979-1_22.

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Li, Hui, Li Zhang y Zhanzhan Zhang. "Research on Cue Fusion Based on the Particle Filter". En 2011 International Conference in Electrics, Communication and Automatic Control Proceedings, 1197–202. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8849-2_153.

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Actas de conferencias sobre el tema "Cube partiel"

Okada, Kazuya y Akira Satoh. "Analysis of a Stokes Flow Past a Cube (Friction and Diffusion Coefficients for Brownian Dynamics Simulations)". En ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10549.

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Abstract Magnetorheological properties significantly depend on the regime of aggregate structures. In the case of cubic particles, closely-packed clusters that are significantly different from those for the case of spherical or rod-like particles are formed in the system since magnetic cube-like particles prefer a face-to-face contact with the neighboring particles. Therefore, a cubic particle suspension is expected to exhibit a sufficiently strong magnetorheological effect, which may be investigated by means of Brownian dynamics simulations. However, the translational and rotational diffusion (or friction) coefficients of a cube are not known and indispensable in order to develop this simulation technique. From this background, in the present study, we have analyzed the flow field around a cube in a Stokes flow regime in order to estimate the diffusion (or friction) coefficients of cube-like particles that are required for performing Brownian dynamics simulations of a cubic particle suspension. In the situation of a uniform flow field with a Reynolds number sufficiently smaller than unity, the force acts on the cube only in the flow field direction, and the torque acting on the cube may be regarded as negligible. In the situation of a rotational flow field with a sufficiently low Reynolds number, the torque acts on the cube only in the direction of angular velocity of the rotational flow field, and the force negligibly act on the cube. These characteristics are in significantly similar to those for the case of spheres in a Stokes flow situation. From these results, we may conclude that the diffusion coefficients of cube-like particles can be expressed by introducing a correction factor to those of the spherical particles.

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Moreira, Angelica Aparecida y Joubert de Castro Lima. "Full and partial data cube computation and representation over commodity PCs". En 2012 IEEE 13th International Conference on Information Reuse & Integration (IRI). IEEE, 2012. http://dx.doi.org/10.1109/iri.2012.6303074.

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Fazal, Muhammad Adnan, Syed Hamza Ahmad, Arif Yousuf, Aziz ur Rehman, Sameer Mustafa Noor y Irfan Nazir. "Engineered Ultra-Low Invasion Loss Control Solution Allows Circulation, Ensuring Cement Placement and Zonal Isolation in Liner Cementing Jobs and Through Coiled Tubing – Case Studies". En SPE 2023 Symposium Compilation. SPE, 2023. http://dx.doi.org/10.2118/217356-ms.

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Abstract The conventional loss cure techniques are largely reactive and include addition of coarse grade particle, fibrous material and other viscous pills that are lost into formation during loss cure attempts. Being highly invasive, these loss cure solutions block pore throats and line producing fractures causing considerable formation damage and loss of net asset value. Moreover, these techniques pose additional challenges while placing thru slim liners and coiled tubing (in rigless applications) due to elevated risk of getting the circulation ports plugged. Moreover, during the era of technological revolution and decarbonization, an effective and efficient solution aids to promote the practices producing low carbon emission. The proactive wellbore shielding loss cure is a particle size distribution-based LCM solution having excellent fluid loss properties and exhibiting low permeability barrier at the fluid-rock interface. The low permeable shielding effect offers less invasion across a broad range of pores (1microns to 4,000microns) and thereby protecting formation from any permanent impairment. The solution covers the wide range applications of loss cure throughout well life ensuring zonal isolation and saving significant rig time. Customized particle size distribution does allow LCM solution to be pumpable thru liner complying the allowable particle sizes (less than 1,000microns) and concentrations (upto 18 lbs/bbl) and for coiled tubing specialized applications with allowable particles size of 100 microns while maintaining rheological properties (Fluid Loss<50 ml/30 min, 5lbs/100ft2>Ty<10lbs/100ft2 & PV<90 cp). This paper demonstrates the working principle and practical applications of engineered solution for loss cure and successfully achieving zonal isolation in 7" liner being placed as pre-cement spacer in naturally fractured formation. The wellbore shielding pre-cement spacer ensured the cement rise above loss point thus achieving zonal isolation in partial to complete losses environment and helps in minimizing formation's impairment. The same approach was adopted to cure losses in rigless with coiled tubing in both carbonate and sandstone reservoirs for well killing and zonal isolation without plugging the CT BHA and circulation ports while complying design requirements.

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"A DISCRETE PARTICLE SWARM ALGORITHM FOR OLAP DATA CUBE SELECTION". En 8th International Conference on Enterprise Information Systems. SciTePress - Science and and Technology Publications, 2006. http://dx.doi.org/10.5220/0002496000460053.

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Alawadhi, Nader y Ozgur Sinanoglu. "Revival of partial scan: Test cube analysis driven conversion of flip-flops". En 2011 IEEE VLSI Test Symposium (VTS). IEEE, 2011. http://dx.doi.org/10.1109/vts.2011.5783731.

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Dehne, F., T. Eavis y A. Rau-Chaplin. "Top-down computation of partial ROLAP data cubes". En 37th Annual Hawaii International Conference on System Sciences, 2004. Proceedings of the. IEEE, 2004. http://dx.doi.org/10.1109/hicss.2004.1265517.

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Ali, Atif y Mohammad Bilal Malik. "Particle filter based orientation of a class of under-actuated system under constraints". En 2016 International Conference on Computing, Electronic and Electrical Engineering (ICE Cube). IEEE, 2016. http://dx.doi.org/10.1109/icecube.2016.7495227.

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Fauzan, Akhmad, Umar Khayam, Suwarno, Masahiro Kozako y Masayuki Hikita. "Design and Fabrication of 3-D Cube UHF Antenna for Partial Discharge Detection". En 2018 Condition Monitoring and Diagnosis (CMD). IEEE, 2018. http://dx.doi.org/10.1109/cmd.2018.8535817.

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Zhou, Zheng, Jian Liu y Jinwen Tian. "Real-time hyperspectral image cube compression combining adaptive classification and partial transform coding". En 2006 8th international Conference on Signal Processing. IEEE, 2006. http://dx.doi.org/10.1109/icosp.2006.345561.

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Xia, Ying, Ting Ting Luo, Xu Zhang y Hae Young Bae. "A Parallel Adaptive Partial Materialization Method of Data Cube Based on Genetic Algorithm". En Computer Science and Technology 2016. Science & Engineering Research Support soCiety, 2016. http://dx.doi.org/10.14257/astl.2016.123.29.

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Informes sobre el tema "Cube partiel"

Romero, Antonio. The Political Dialogue and Cooperation Agreement and relations between European Union and Cuba. Fundación Carolina, febrero de 2022. http://dx.doi.org/10.33960/issn-e.1885-9119.dtff01en.

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This document makes an assessment of the Political Dialogue and Cooperation Agreement (PDCA) between Cuba and the European Union (EU) in its four years of validity, and of the evolution of political and economic relations between both parties. The analysis is structured in five headings that address the background, determinants and significance of the PDCA between Cuba and the EU; the main elements discussed in the political dialogue —and in thematic dialogue— between the two parties since 2018, and the central aspects of trade, investment and cooperation relations between Cuba and the EU. The report concludes that, unlike the United States, the EU is able to support the complex process of economic and institutional transformations underway in Cuba, in four fundamental areas: i) technical assistance and advice for the design and implementation of public policies, macroeconomic management, decentralisation and local development; ii) cooperation to fight climate change and transform Cuba’s productive and technological structure; iii) the promotion and encouragement of foreign investment flows from Europe, targeting key productive sectors; and iv) the exploration of financial opportunities for Cuba through the European Investment Bank (EIB) under the current PDCA.

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Angel, Sergio, Omara Ruíz Urquiola, José Raúl Gallego, Alenmichel Aguiló, Leonardo Fernández, Dimas Castellanos, David Gómez, Maria Camila Herrera y Catalina Rodríguez. La eternización de la Revolución y su costo para la academia en Cuba. Editorial 4Métrica, junio de 2023. http://dx.doi.org/10.56650/9786289583120.

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El presente informe no constituye un resumen, ni un balance, de la marginación por motivos ideológicos o de cualquier índole en el sistema educativo cubano a partir de 1959. Es parte de un trabajo gradual y sistemático que mensualmente documenta dos casos (uno histórico y otro posterior a 2010) de víctimas de discriminación. También contiene el análisis de un discurso o instrumento programático que avale la represión en el ámbito de la enseñanza, así como incluye el examen de una regulación que atente contra derechos relacionados con la libertad académica.

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Romero, Antonio. El Acuerdo de Diálogo Político y Cooperación y las relaciones entre la Unión Europea y Cuba. Fundación Carolina, febrero de 2022. http://dx.doi.org/10.33960/issn-e.1885-9119.dtff01es.

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El presente documento realiza una valoración del Acuerdo de Diálogo Político y Cooperación (ADPC) entre Cuba y la Unión Europea (UE) en sus cuatro años de vigencia, y de la evolución de las relaciones políticas y económicas entre ambas partes. El análisis se estructura en cinco epígrafes que abordan los antecedentes, determinantes y trascendencia del ADPC entre Cuba y la UE; los principales elementos debatidos en el diálogo político —y en diálogos temáticos— entre ambas partes desde el año 2018, y los aspectos centrales de las relaciones comerciales, de inversión y de cooperación entre Cuba y la UE. El trabajo concluye que, a diferencia de Estados Unidos, la UE está en condiciones de apoyar el proceso complejo de transformaciones económicas e institucionales en curso en Cuba, en cuatro áreas fundamentales: i) asistencia técnica y asesoramiento para el diseño y aplicación de políticas públicas, manejo macroeconómico, descentralización y desarrollo local; ii) cooperación para la lucha contra el cambio climático y para la transformación de la estructura productiva y tecnológica cubana; iii) promoción y estímulo a flujos de inversión extranjera procedentes de Europa, dirigidos a sectores productivos claves; y iv) exploración de oportunidades financieras para Cuba a través del Banco Europeo de Inversiones (BEI) al amparo del ADPC vigente.

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Angel, Sergio, Omara Isabel Ruiz Urquiola, José Raul Gallego, Alenmichel Aguiló, Leonardo Fernández Otaño, Dimas Castellanos, David Gómez Gamboa y Maria Camila Herrera. Cuba: las muchas secuencias de la depuración ideológica en la academia. Editado por Catalina Rodríguez. 4Métrica, octubre de 2023. http://dx.doi.org/10.56650/9786289583199.

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Esta publicación expone los incidentes relacionados con la normalización de la discriminación de carácter político en áreas disímiles del espectro educacional cubano. Desde los propios inicios de la Revolución y a la par del incremento de oportunidades de estudios superiores para jóvenes procedentes de estratos sociales desfavorecidos, se extendió territorialmente la enseñanza superior en especialidades a las que antes solo se accedía en la capital. De tal suerte, la carrera de Medicina se inauguró en la Universidad de Oriente con el objetivo fundamental de fortalecer los servicios de salud pública en esa parte del país

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Rojas, Nastassja, Sergio Angel, Germán Quintero, Claudia González, Maria Camila Herrera, Daniela Serna, Lina Muñoz y Valentina Bohórquez. Derecho a la alimentación, gestación y lactancia. Aproximación al caso Cuba. 4Métrica, enero de 2023. http://dx.doi.org/10.56650/9786289521399.

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El informe “Derecho a la alimentación, gestación y lactancia” presenta las condiciones que atraviesan las personas durante estas etapas y las afectaciones que se producen ante la inseguridad alimentaria vivida en el mundo, particularmente en Cuba. Por lo cual, hay una clara evidencia de la invisibilización de la violencia contra las mujeres durante la gestación y la lactancia, una etapa que supone un ejercicio más amplio de las comprensiones de las dinámicas sociales, las dificultades, las precariedades, y las responsabilidades del Estado. Además, se señala que la protección a las personas gestantes es un componente esencial para prevenir y reducir la pobreza y la vulnerabilidad, promover la salud, la nutrición, el bienestar, y para proporcionar un trabajo digno para las mujeres y los hombres. Por su parte, las personas gestantes migrantes o con dificultades económicas tienen una situación incrementada de vulnerabilidad.

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Engel, Wanda, Ricardo Paes De Barros, Mirela de Carvalho, Carlos Alberto Ramos, Ana Lucia Lobato, Gabriel Ferrato dos Santos, Fabio Sánchez Torres, Luz Magdalena Salas Bahamón y Carlos Lacayo. Políticas efectivas para erradicar la pobreza: Desafíos institucionales, de diseño y de monitoreo. Inter-American Development Bank, agosto de 2006. http://dx.doi.org/10.18235/0012088.

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El presente documento forma parte de una serie de estudios comisionados por el Banco Interamericano de Desarrollo para el Diálogo Regional de Política. La publicación recoge una selección de trabajos discutidos durante la quinta y sexta reuniones de la Red de Pobreza y Protección Social (2003 y 2004). Este volumen cubre tres temas principales, relativos a la efectividad de las políticas encaminadas a reducir la pobreza y la desigualdad: i) Diseño e implementación de programas, ii) aspectos institucionales, y iii) diagnóstico, monitoreo y evaluación de programas.

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Cárdenas Caicedo, Evelyn Tatiana y Yury Esperanza Martínez Panqueva. Innovación para la inclusión en el Distrito Capital. Escuela Tecnológica Instituto Técnico Central, 2013. http://dx.doi.org/10.55411/2023.47.

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El presente proyecto pretende continuar, ampliar y perfeccionar el proceso investigativo iniciado el año anterior, en aquel momento durante el desarrollo de la Maestría en Docencia en la Universidad de La Salle, por parte del investigador principal de este proyecto. Pretende también dar cimiento e inicio formal al grupo de investigación pedagógica de la Escuela Tecnológica ITC, GIPEC, y aportar a la enseñanza de las ciencias en nuestro país como ya lo ha hecho en diversos escenarios (La Habana Cuba, 2009. Universidad Pedagógica Nacional, 2009, IDEP Bogotá, 2009). La dificultad de la cual se parte es de encontrar en nuestros estudiantes de primeros semestres de la ETITC, limitaciones relacionadas con el tipo de respuestas dadas a cuestionamientos básicos, carentes de creatividad, racionamiento deductivo, racionamiento lógico, razón de ser del conocimiento, y hasta motivación, que tienden, entre otras cosas a llevarlos a mediano plazo a desorientarlos y hasta engrosar los porcentajes de deserción escolar, esta se constituye en la principal observación que lleva a identificar el problema. La falta de herramientas clave para su propio entendimiento y avance adecuado en su trasegar por la institución, debe llevarnos a buscar solución a tal dificultad.

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Erazo Moreno, Gloria Stella, Valerie Michell Vallejo Vilaro y Andrés Fernando López Cruz. 11.° Encuentro Nacional y 9.° Encuentro Internacional de Investigación de Facultades de Derecho del campus Cartago, sede Pereira-Cartago de la Universidad Cooperativa de Colombia, 2021. Ediciones Universidad Cooperativa de Colombia, diciembre de 2023. http://dx.doi.org/10.16925/ecam.06.

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Este libro hace parte de una colección de ponencias completas o en curso, derivadas del 11.° Encuentro Nacional y 9.° Internacional de Facultades de la Universidad Cooperativa de Colombia, campus Cartago, con el fin de poder dar testimonio sobre las perspectivas y los avances de investigación de una comunidad disciplinar, para que un público amplio, diferente de aquel que participó en el evento, pueda consultar los textos en el tiempo y, así, conocer las propuestas que al respecto surgen desde la academia y, por lo tanto, reflexionar sobre una problemática determinada e, incluso, que los utilice como material de docencia o investigación. Las áreas académicas que cubre son principalmente el derecho, la educación y las humanidades. El público lector al que está dirigido son profesores, investigadores y estudiantes de pregrado y posgrado interesados en recibir información actualizada de procesos de investigación en desarrollo, de reflexión.

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Flórez Martínez, Diego Hernando. Análisis de tendencias para la cadena láctea :consumo, demanda, mercado internacional e investigación en Colombia. Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, 2013. http://dx.doi.org/10.21930/agrosavia.informe.2013.3.

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El marco actual para el sector lácteo y su cadena productiva, está focalizado en la transición del sector a un marco competitivo de producción, donde la creación de empresas y esquemas asociativos tipo clúster incrementando la productividad y fortaleciendo el consumo interno, teniendo en cuenta que actualmente la coyuntura, de los TLC con Norte América y Europa colocan al sector en estado de vulnerabilidad. El plan de transformación productiva (PTP), focaliza al sector en un horizonte prospectivo de conglomerados lácteos de talla mundial, esto soportado en 4 pilares básicos: Colombia es cuarto productor de leche en América Latina con un volumen aproximado de 6.500 millones de litros anuales, superado sólo por Brasil, México y Argentina. Actualmente, para este sector se está formulando el plan de desarrollo/negocios, con el que se busca fortalecer toda la cadena productiva. En el país existen 2.600 millones de litros de leche fresca disponibles para el procesamiento por parte de nuevas industrias, cantidad que actualmente no entra al canal formal de transformación. Es el tercer mercado en ventas de lácteos en América Latina, con un valor anual US$ 2.862 millones, con acceso preferencial en mercados como la CAN, Mercosur, Chile, Cuba, Canadá, México, UE y con EE.UU. En la tabla 1, se sintetiza el estado actual de sector en cifras clave.

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Anderson, Gerald L. y Kalman Peleg. Precision Cropping by Remotely Sensed Prorotype Plots and Calibration in the Complex Domain. United States Department of Agriculture, diciembre de 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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