Global Tuning
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Yield-scaled global warming potential of two irrigation management systems in a highly productive rice system
ABSTRACT Water management impacts both methane (CH4) and nitrous oxide (N2O) emissions from rice paddy fields. Although controlled irrigation is one of the most important tools for reducing CH4emission in rice production systems it can also increase N2O emissions and reduce crop yields. Over three years, CH4 and N2O emissions were measured in a rice field in
Sci. agric. (Piracicaba, Braz.). Publicado em: 2016-02
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2. Design of a passive nonlinear observer and a backstepping controller for surface vessels. / Projeto de um observador passivo não-linear e de um controlador backstepping para navios de superfície.
Dynamic Positioning Systems (DPS) are control systems used to maintain the vessel on a desired position or pre-defined path exclusively by means of active thrusters. A DPS can be separated into a set of dedicated modules with designated tasks. The most significant modules are the position and heading measurement systems, the state estimator, the controller a
Publicado em: 2010
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3. Projeto de controladores baseado em dados : convergência dos métodos iterativos
O projeto de controladores baseado em dados consiste no ajuste dos parâmetros do controlador diretamente das bateladas de dados do processo, sem a necessidade de um modelo. O ajuste é feito resolvendo um problema de otimização, onde procura-se o argumento que minimize uma determinada função custo. Para resolver o problema de otimização são utilizado
Publicado em: 2009
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4. Avaliação de técnicas calorimétricas aplicadas ao monitoramento de processos químicos. / Calorimetric technique evaluation applied for chemical processes monitoring.
The increasing demand for the production of polymers with more tight properties has placed great emphasis on the development of accurate and robust online monitoring techniques of polymerization reactions. Unfortunately, most of the main characteristics are not measurable online from analytical methodologies currently available and, therefore, in practice, t
Publicado em: 2009
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5. Modelagem de sistemas dinamicos não lineares utilizando sistemas fuzzy, algoritmos geneticos e funções de base ortonormal / Modeling of nonlinear dynamics systems using fuzzy systems, genetic algorithms and orthonormal basis functions
This work introduces a methodology for the generation and optimization of Takagi-Sugeno (TS) fuzzy models with Orthonormal Basis Functions (OBF) for nonlinear dynamic systems based on a genetic algorithm. Orthonormal basis functions have been used because they provide models with properties like absence of output feedback and the possibility to reach a reaso
Publicado em: 2006
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6. UMA ARQUITETURA PARA AUTO-SINTONIA GLOBAL DE SGBDS USANDO AGENTES / AN AGENT-BASED ARCHITECTURE FOR DBMS GLOBAL SELF-TUNING
The increasing complexity of the commercial DBMSs as well the workload they manage, besides the fact that many users do not have deep knowledge about database administration, among other reasons, strongly suggests the introduction of techniques that automates the database tuning process. Self- Tuning, or auto-tuning, is a feature that makes systems adaptable
Publicado em: 2004
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7. CRIAÇÃO AUTÔNOMA DE ÍNDICES EM BANCOS DE DADOS / AUTONOMIC INDEX CREATION IN DATABASES
The choice and materialization of indexes are activities commonly done by database administrators to speed up database application processing. Due to the complexity of the index selection task and to the pressure for productivity increase put on tuning professionals, many works on the literature and on commercial systems seek for tools that can help the DBA
Publicado em: 2004
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8. Local and global attention are mapped retinotopically in human occipital cortex
Clinical evidence suggests that control mechanisms for local and global attention are lateralized in the temporal–parietal cortex. However, in the human occipital (visual) cortex, the evidence for lateralized local/global attention is controversial. To clarify this matter, we used functional MRI to map activity in the human occipital cortex, during lo
The National Academy of Sciences.
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9. Inositol 1,4,5-tris-phosphate activation of inositol tris-phosphate receptor Ca2+ channel by ligand tuning of Ca2+ inhibition
Inositol 1,4,5-tris-phosphate (IP3) binding to its receptors (IP3R) in the endoplasmic reticulum (ER) activates Ca2+ release from the ER lumen to the cytoplasm, generating complex cytoplasmic Ca2+ concentration signals including temporal oscillations and propagating waves. IP3-mediated Ca2+ release is also controlled by cytoplasmic Ca2+ concentration with bo
The National Academy of Sciences.
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10. Negative Transcriptional Regulation of the ilv-leu Operon for Biosynthesis of Branched-Chain Amino Acids through the Bacillus subtilis Global Regulator TnrA
The Bacillus subtilis ilv-leu operon is involved in the synthesis of branched-chain amino acids (valine, isoleucine, and leucine). The two- to threefold repression of expression of the ilv-leu operon during logarithmic-phase growth under nitrogen-limited conditions, which was originally detected by a DNA microarray analysis to compare the transcriptomes from
American Society for Microbiology.
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11. Physical limits to spatial resolution of optical recording: Clarifying the spatial structure of cortical hypercolumns
Neurons in macaque primary visual cortex are spatially arranged by their global topographic position and in at least three overlapping local modular systems: ocular dominance columns, orientation pinwheels, and cytochrome oxidase (CO) blobs. Individual neurons in the blobs are not tuned to orientation, and populations of neurons in the pinwheel center region
National Academy of Sciences.
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12. Figure-ground activity in primary visual cortex is suppressed by anesthesia
By means of their small receptive fields (RFs), neurons in primary visual cortex perform highly localized analyses of the visual scene, far removed from our normal unified experience of vision. Local image elements coded by the RF are put into more global context, however, by means of modulation of the responses of the V1 neurons. Contextual modulation has b
The National Academy of Sciences.