New Releases by Jose Silva

Jose Silva is the author of Speaker 2003 Y La Bola de Beisbol (2025), Creative Coincidences (2024), Free Your Magnificent Mind (2023), The Insect Voltage-gated Sodium Channel (2022), Lory e o Paradoxo da Normalidade (2021).

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Speaker 2003 Y La Bola de Beisbol

release date: Jan 26, 2025
Speaker 2003 Y La Bola de Beisbol
El cajero automático Speaker 2003 nos narra un día repleto de surrealismo e insólitas y grotescas situaciones en torno a todos los personajes que desfilan ente él. Desde el amanecer hasta el cierre, es testigo de las contradicciones y misterios del alma humana a través de las situaciones más ridículas, donde cada cliente es una nueva oportunidad para que Speaker 2003 despliegue su aguda ironía y sentido del humor. La Bola de Beisbol es un viaje surrealista y extravagante en busca de la libertad y la felicidad, guiado por encuentros inesperados y personajes peculiares, dónde se mezcla lo absurdo con lo existencial. Desde la llegada al Reino de Pikolín, con su Reina atrapada en un hechizo, hasta el bosque donde surgen relatos oscuros y grotescos como el del lobo y Caperucita; desde el encuentro con Dorothy, completamente transformada, o la conmovedora historia de la lapa Palomino, hasta la aparición del genio Buen Rollito, que cierra la travesía con una reflexión sobre los deseos humanos.

Creative Coincidences

release date: Nov 15, 2024
Creative Coincidences
Scientific research reveals why some people are so much luckier than everybody else. Jose Silva was one of the lucky ones, and he wanted to know why. This book is about what he learned, and his newest and most valuable technique: the MentalVideo. Coincidences are like angels from heaven, divine messengers who bring you help from the other side to: *put you in the right place at the right time *introduce you to the right people *guide you to meaningful work *help you make good decisions in business and life *aid in your spiritual growth and personal development. Creative Coincidences gives you step-by-step instructions, as well as case studies, explanations, and real-world examples. Includes free Silva training so you can start tonight and get the guidance and lucky breaks you need to help you achieve your goals.

Free Your Magnificent Mind

release date: May 16, 2023
Free Your Magnificent Mind
After 15 years of teaching more than 3 million people his System for using more of their mind the way ultra-successful people do, Jose Silva wanted to continue guiding them- physically, emotionally, and spiritually – so Silva started a “Founder’s Column" which became the most popular feature in the Silva Method Newsletter. It ran in every issue for the last 20 years of his life. Free Your Magnificent Mind, contains 100 of these columns which include: an effective way to program for world peace observations and life experiences thoughts about why we should act our age Like many ultra-successful people, Silva was great at giving simple explanations for complex subjects. Not many people throughout history can claim to have started with so little, come so far, and achieved so much. Losing both parents by the age of 6, he went to work instead of going to school - he never attended school a day in his life as a student. Yet his scientific discoveries about the mind and human potential have literally changed the consciousness of humanity. He held 3 patents including one that was the first patent that stated "Human concentration turns on an educational program.” The articles are brief, averaging about 750 words each and are easy to read whenever you have a few minutes for some inspiration and motivation. It includes an appendix with several of the mental techniques he talks about so that you can apply them yourself. There is also information about where to get more help if you need it.

The Insect Voltage-gated Sodium Channel

release date: Jan 01, 2022
The Insect Voltage-gated Sodium Channel
The voltage-gated sodium channel (VGSC) plays an essential role in the nervous system for thegeneration of action potentials and, given its relevance, it has been used as a target of insecticides (e.g. pyrethroids, DDT and oxadiazines) to control vectors of human pathogens such as Aedes aegypti. Insects have only one copy of the Vgsc gene, but they produce multiple splice variants due to differential exon usage. We compared the exon conservation of the VGSC between 68 species (10 Orders). The amino acid similarity of exons ranged from 42.5 to 100% and evidenced an increase in the number of alternative, mutually exclusive and 5'' or 3'' alternative splice site exons from Diplura to Diptera. Mutations in the Vgsc gene (knockdown resistance, kdr) are one of the main mechanisms of resistance to pyrethroids in A. aegypti. Resistance alleles can provide both advantages (insecticide resistance) and disadvantages (fitness costs) to mosquitoes in the presence and absence of insecticides, respectively. We isolated a strain of A. aegypti carrying a kdr allele (410L+1016I+1534C) but congenic to a pyrethroid-susceptible strain. The levels of cross-resistance to multiple insecticides pyrethroids, DDT and oxadiazines were compared between three congenic strains carrying different kdr alleles (410L+1016I+1534C, 989P+1016G and 1534C). The 410L+1016I+1534C allele did not confer higher levels of resistance relative to the 1534C allele for most insecticides tested. However, the 410L+1016I+1534C allele conferred higher levels 1R-cis _S cypermethrin and deltamethrin relative to the 1534C allele. This is the first report of increased levels of resistance to a stereoisomer conformation associated to a kdr allele. To study the fitness costs associated, we conducted a population cage experiment where the congenic strains carrying the 410L+1016I+1534C and 1534C alleles were crossed and allowed to mate through nine generations in the absence of insecticide exposure (but a subset of mosquitoes of the F 9 were selected with deltamethrin and allowed to mate). There was a dramatic decrease in the allele frequencies of the 410L+1016I+1534Callele (resulting in decreased number mosquitoes homozygous for this allele) but it quickly recovered after deltamethrin selection. Overall, our results suggest that the 410L+1016I+1534C allele is highly advantageous over the 1534C allele in field populations of A. aegypti where 1R-cis _S cypermethrin or deltamethrin are applied but use of other pyrethroids would be equally inefficient for either of these alleles. However, the frequencies of the 410L+1016I+1534C allele would likely decrease relative to 1534C in the absence of pyrethroid exposure under conditions similar to those tested in this project.

Lory e o Paradoxo da Normalidade

release date: Jan 12, 2021
Lory e o Paradoxo da Normalidade
Lory é uma jovem com o enfadonho destino da normalidade pesando sobre seus ombros. Nesse romance cheio de picardia e aventuras extra-sensoriais, encontramos a protagonista Lory envolta em escolhas e buscas pela liberdade e crescimento pessoal. Namoro, família, ganhar a vida com o próprio suor, tudo a faz lutar contra o tédio da vida comum. Até o dia em que se vê diante da bifurcação entre o real e o sobrenatural.

Create a Genius

release date: Nov 28, 2020
Create a Genius
A miraculous guide for parents to use the world-famous Silva Method to conceive, raise, and educate a brilliant child who will thrive and improve the world.

The Silva Mind Control Method for Business Managers

release date: Nov 06, 2020
The Silva Mind Control Method for Business Managers
Use your whole mind for a new dimension in creative power! The renowned program that has worked for millions worldwide is now specially tailored for managers. This book will help you make yourself, your people, and your organization more successful.

Introduction to Electronic Circuits

release date: Apr 29, 2020
Introduction to Electronic Circuits
This book provides a compact and practical presentation of microelectronics circuits for a one-semester introductory course. Contrary to textbooks that are written for comprehensive two-semester electronics courses, the focus of this book is on the basic concepts and immediate discussion of application examples to instill more interest. The theoretical concepts are introduced by explaining the methods to analyze elementary electronic circuits with design considerations, design procedures, and simulation examples.With this approach, students are prepared early to design and measure simple electronic circuits in the laboratory. This is an exciting aspect that not only motivates students but also enables a well-rounded learning experience.

Silva Ultramind Systems Persuasive Thoughts

release date: Apr 10, 2019
Silva Ultramind Systems Persuasive Thoughts
José Silva Jr.’s 30-day plan shows you how to program your brain & mind for greater success. Week 1: Start using the Alpha Brainwave Level to • Relieve stress for relaxation and good health • Strengthen your willpower with imagination • Turn difficult problems into creative solutions • Develop a leadership mindset Week 2: Gain control of your subconscious mind • Eliminate limiting beliefs, fears, and phobias • Convert self-doubt to confidence and optimism • Employ dreams to find solutions to problems • Win praise and gain more respect Week 3: Guiding principles for success • Guidance and help from a higher power • The Universal Laws of Programming • How José Silva programmed to acquire money • Discover and fulfill your life purpose Week 4: Increasing your power to influence • Your aura is your invisible persuader • Overcome deep-rooted problems at Theta • Unleash the genius potential in your child • Be recognized as a visionary and a leader

Silva Ultramind Systems ESP for Business Success

release date: Jan 16, 2019
Silva Ultramind Systems ESP for Business Success
Whether you are a business executive or a home worker, an entrepreneur or freelancer, Jose Silva''s UltraMind Systems ESP for Business Success gives you the winning mindset you need to succeed. *Oprah Winfrey said: "The more we can tune in to our intuition, the better off we are." * Steve Jobs called it "more powerful than intellect." * Albert Einstein said it is "the sacred gift." Your knowledge, mind power, and inner strength will give you the only real job security that exists. This book will help you: Make better decisions Improve efficiency Boost your confidence Communicate better Find hidden information Anticipate the future Plan for what lies ahead Create a better world The UltraMind ESP System is the culmination of the life work of Silva Method founder José Silva. Start today, because the greatest discovery you will ever make is the power of your own mind.

Design Techniques for Mash Continuous-Time Delta-Sigma Modulators

release date: Mar 27, 2018
Design Techniques for Mash Continuous-Time Delta-Sigma Modulators
This book describes a circuit architecture for converting real analog signals into a digital format, suitable for digital signal processors. This architecture, referred to as multi-stage noise-shaping (MASH) Continuous-Time Sigma-Delta Modulators (CT-ΔΣM), has the potential to provide better digital data quality and achieve better data rate conversion with lower power consumption. The authors not only cover MASH continuous-time sigma delta modulator fundamentals, but also provide a literature review that will allow students, professors, and professionals to catch up on the latest developments in related technology.

Silva UltraMind's Intuitive Guidance System for Business

release date: Oct 17, 2017
Silva UltraMind's Intuitive Guidance System for Business
SILVA ULTRAMIND''S INTUITIVE GUIDANCE SYSTEM FOR BUSINESS The secret to business success is intuition. It''s not just a matter of following you hunches. It''s about following the right hunches. Being able to sense people''s inner thoughts and needs helps you say and do the things needed to quickly reach your goals and achieve success. Many people know this, but many also believe that a good sense of intuition is something that you''re just born with-not something that you can develop and train. Jose Silva, developer of the world-famous Silva Mind Control Method, had proved them wrong. Now, with Mr. Silva''s state-of-the-art UltraMind Intuitive Guidance System for Business, you can learn how to use your intuition regularly and reliably. You will learn how to: Program yourself to do the right thing at the right time in order to take advantage of opportunities and increase income. Sense what other people''s real wants and needs are so that you can say the right thing at the right time when negotiating, managing subordinates, or reporting to superiors and shareholders. Learn mental techniques to establish immediate rapport with co-workers, customers, clients, and suppliers. Program your work environment for success. Trust your judgment and your decisions and end doubt and second-guessing.

Franchisors' Choice Between Royalties and Fixed Fees Evidence from Brazil

release date: Jan 01, 2017
Franchisors' Choice Between Royalties and Fixed Fees Evidence from Brazil
In franchise contracts, the royalty rate and the fixed entrance fee are the main monetary clauses defining the payment scheme between the franchisor and the franchisee. In the traditional agency view, the presence of distant outlets leads the franchisor to choose a payment mechanism designed to provide incentives to the franchisee; that is, a low royalty rate associated with a high fixed fee. Based on a unique panel dataset, we provide evidence that, in the Brazilian context, spatial dispersion has the opposite impact, with interesting practical and research implications.

Spatial Strategies in Brazilian Franchising; Behavior Categories and Performance Outcome

release date: Jan 01, 2016
Spatial Strategies in Brazilian Franchising; Behavior Categories and Performance Outcome
This empirical article deals with the location strategy and performance outcomes of franchised chains in Brazil. Brazilian franchising has experienced vertiginous process of expansion in recent years, being present in different regions of this country of continental size, including the most remote and less developed. Based on the background literature in economics and management regarding location choices and spatial competition in retailing, we use a new and unique dataset to distinguish several behavior categories in spatial strategies of franchising chains in Brazil, via a two-step cluster analysis. The performance outcomes are then studied with econometric estimations on panel data. Our results provide evidence that the choice for agglomeration, and the location in areas with a high population and a high human development index, lead to higher chain performances.

La madeja

release date: Jan 01, 2016

The Silva Mind Control Method

release date: Jun 04, 2015
The Silva Mind Control Method
Buku ini menyajikan teknik realisasi diri terbaik. Sejak buku ini pertama diterbitkan dalam versi hardcover, sudah lebih dari satu juta orang lulusan pelatihan Pengendalian Pikiran (termasuk para pesohor top) memanfaatkan pikiran pada level yang lebih dalam dan efektif. Bahkan ketika mereka tidur! Bersumber dari kursus 4 hari yang dipelopori José Silva, buku yang mengubah kehidupan ini menunjukkan bagaimana orang belajar mengatasi ketegangan, kebiasaan buruk, perasaan tidak aman, dan bahkan sejumlah penyakit, dengan menggunakan teknik Pengendalian Pikiran. Selain itu, dengan visualisasi kreatif, mereka menguasai kemampuan untuk melihat hal-hal yang mereka dambakan kemudian mewujudkannya! Inilah naskah lengkap The Silva Mind Control Methodâ yang boleh jadi adalah buku paling penting dan berharga bagi Anda. Sinopsis buku: Metode Silva adalah program swadaya dan meditasi yang dikembangkan oleh José Silva. Ia mengklaim dapat meningkatkan kemampuan individu melalui relaksasi, pengembangan fungsi otak yang lebih tinggi, dan psikis seperti clairvoyance. Silva mengklaim telah mengembangkan sebuah program yang melatih orang untuk memasuki kondisi otak tertentu yang meningkatkan kesadaran. Dia juga mengklaim telah mengembangkan beberapa proses mental sistematis untuk digunakan saat dalam keadaan ini memungkinkan seseorang untuk memproyeksikan mental dengan maksud tertentu. Menurut Silva, begitu pikiran diproyeksikan, seseorang diduga dapat melihat objek atau lokasi yang jauh dan terhubung dengan kecerdasan yang lebih tinggi untuk mendapatkan bimbingan. Informasi yang diterima oleh pikiran yang diproyeksikan kemudian dikatakan sebagai pikiran, gambar, perasaan, bau, rasa dan suara oleh pikiran. Informasi yang diperoleh dengan cara ini dapat ditindaklanjuti untuk memecahkan masalah. Informasi lainnya Judul buku : The Silva Mind Control Method Jumlah halaman : 0 Penerbit : Change Tanggal terbit : 5 Juni 2015 ISBN : 9786023720002 Berat : 0.5000 kg Lebar : 0 cm Bahasa : Indonesia Format : Soft cover

Trans-Atlantic Re-turnings

release date: Jan 01, 2015
Trans-Atlantic Re-turnings
This report constitutes an auto-account that theorizes on/as my process of transitioning as a black trans Brazilian woman. In order to do so, I work with the concept of transitioning in conjunction the idea of re-turn by drawing mainly from studies within the realm of black feminism, black studies and Trans Studies. For this text, I elect the transitioning along temporalities, embodied sexualized gendered racialized experiences in different geographies I cross, with focus on my connections with Brazil.

Non Dvcor Dvco: Parcialmente...

release date: Apr 29, 2014
Non Dvcor Dvco: Parcialmente...
A Zona Leste abriga pouco mais de um terço de toda população paulistana e dentro dessa única região há microcosmos socioeconômicos muito distintos. Concentrado na Zona Leste 2, é desejo do autor que não somente as autoridades, mas principalmente a população olhe para essa região com maior cuidado, especialmente devido à sua alta taxa de vulnerabilidade social.

Subjective Communication

release date: Mar 14, 2014
Subjective Communication
What is Subjective Communication?Subjective Communication is a natural ability that all of the highly successful people on our planet have in common. Subjective Communication is the ability that permits people to know more than their physical senses alone can tell them. Subjective Communication is the one “secret of success” that people have sought to reveal for thousands of years, yet remained hidden because those who had it did not realize that the way they functioned was different from the way the vast majority of people function, and those who didn''t have it considered it so unlikely that they doubted its existence. For the fortunate few who, through natural means, developed the ability to use subjective communications to know more than the majority of people, life has been a fabulous success.These people - about ten percent of the population - are the ones we consider “lucky.” Though they do no more work than other people, they prosper. Though they are no more persistent than millions of others, they succeed while others fail. Though they are no more intelligent than the masses, we call them geniuses. You can develop this ability.All humans are born with the potential to communicate in more ways than through the physical senses. It is your mind, and your phenomenal imagination, that makes you human. In this book, you will learn why imagination is not only used for make believe, but is also used as a communications tool. You will learn exactly what human intelligence is, and what mind is, and how these function in another - invisible-to-the-human-eyes - dimension where we exchange vital information that helps improve our relationships, our decision making ability, and our chances for success and happiness in this life. You will have a rare opportunity to look inside the mind of a genius, a natural psychic who has been using this ability for more than sixty years, as this genius is interviewed by a veteran newspaper reporter turned researcher. This insight and understanding will help you develop your own abilities. Never before has there been a book like this one, that strips the mystery away and explains in simple language exactly what this thing called ESP really is and how you can learn to use it like the most successful people in our world do. It is your heritage as a human being. Use it.

Jose Silva's Guide to Mental Training for Fitness and Sports

release date: Mar 05, 2014
Jose Silva's Guide to Mental Training for Fitness and Sports
Research has shown conclusively that when you practice mentally - at the correct level of mind - you will gain almost as much benefit as when you practice physically. When you combine physical and mental practice, your results are far greater. Now the world''s Number One mind training program will show you how. Whether you are a pro, a weekend warrior, of a fitness fanatic, this book is for you. You''ve seen athletes do it in all sports: *Members of the Olympic bobsled team just before their run, eyes closed, their bodies swaying back and forth as they visualize the run *Professional basketball players mimicking the free throw, picturing it mentally, before actually taking the ball and shooting it *The pro golf champion on the tee visualizing his drive. Research has shown conclusively that when you practice mentally - at the correct level of mind - you will gain almost as much benefit as you will when you practice physically. And when you combine both physical and mental practice, your results are far greater. Silva graduates report they have been able to: *Learn what they need to know, faster and easier. *Train their bodies to perform better by visualizing at the correct level of mind *Improve their intuition and anticipation so that they do the right thing at the right time more often, automatically *Manage pain, and recover from injuries faster *Program themselves for success Play the mental game like the superstars do Whether you are a beginner or a world champion, there are techniques in this book that you can use to develop your physical and mental skills. Don''t just sit and watch other people enjoying the rewards of success - get up and get involved. Enjoy the benefits of better health, attractive appearance, the recognition for what you have accomplished, and the personal satisfaction of knowing that you achieved something worthwhile. Use the techniques to help you achieve your training and athletic goals, to get the body you want, and to live the healthy, successful life that you deserve. National and World Champions featured in Jose Silva''s Guide to Mental Training for Fitness and Sports: *Find out how the practical aspects of the Silva Method enabled Vidheya, a young Italian girl, to become National Martial Arts Champion *World Series MVP Bucky Dent tells how the Silva Method helped his career, and why he recommends it to his younger players *Bruce Schneider details how he used Silva techniques to help him hit a home run in the bottom of the 9th inning that won the game and qualified his team for the slow pitch softball World Series *Rafael "Paeng" Nepomuceno of the Philippines explains how the Silva techniques helped him win the World Cup of Bowling *Internationally known sports psychologist Andrzej Wojcikiewicz explains how the Silva techniques helped the Canadian National Fencing Team improve dramatically and do better than expected in the Barcelona Olympics. Young athletes benefit: *Learn how the Silva techniques helped Natalie Lacuesta, an 11-year old Illinois girl and the youngest member of her team, achieve the Number One ranking in the United States in rhythmic gymnastics *Discover the simple technique that basketball coach Hector Chacon used in his halftime talk that turned a group of athletes that experts considered losers, into winners *Learn how Dana Sheets, who believed Jose Silva when he told her she could accomplish anything, used programming and physical practice to make her high school''s varsity tennis team as a freshman Older athletes feel young again: *An Ohio man explains why the Silva System was invaluable in giving him the stamina to earn his black belt in karate at the age of 57 *Learn why a 79-year-old marathon runner praises the Silva techniques Join these people in the Winners Circle with Jose Silva''s step-by-step guidance in this outstanding book.

Sales Power, the Silvamind Method for Sales Professionals

release date: Feb 26, 2014
Sales Power, the Silvamind Method for Sales Professionals
Increase your sales and income and put more money in your pocket with the SilvaMind Method for Sales Professionals. Learn how to use the Silva techniques in sales. This book includes dozens of case studies in many different lines, along with specific step-by-step instructions so you can do the same. Learn how to use your mind to help you: -Relax and reduce stress, pressure, anxiety, nervousness, tension -Overcome call reluctance -Overcome the fear of rejection, failure, and public speaking -Determine immediately if your prospect is interested in your product, service or idea -Prospect more effectively -Get more appointments -Establish immediate rapport with your prospect -Quickly find your prospect''s needs -Increase your client''s desire for your product or service -Improve communications skills -Handle objections smoothly, confidently and easily -Know when to close, and close more effectively -Know what approach to use -Attain and exceed your sales production goals and quotas You will also learn how to: -Improve your memory, recall, concentration and comprehension -Enhance your ability to make decisions and solve problems quickly -Develop and enhance your intuition, insight and creativity -Improve your health and strengthen your immune system -Overcome insomnia, headaches, migraines, burnout and fatigue -Overcome unwanted habits such as smoking, over-eating, alcohol, drugs, procrastination, etc. -Achieve whatever you can conceive and believe. Gain the power of thinking at Alpha Research has shown that there is more information available at the alpha brain wave level than there is at the beta level: -You have better access to information stored in your memory banks -You also have access to information stored on other people''s memory banks Think about the best sales people you know: -The top sales people know where to look for business - they are better prospectors, and people often seek them out -They make clear, simple, easy-to-understand presentations -They handle objections smoothly, in a way that reassures the customer and even gives them an additional reason to buy -They know when to close, how to ask for the order in such a simple way that customers don''t give it a second thought If you want to dramatically increase your sales and income, you can do it. If you want to be recognized as a leader in your profession, this is now within your grasp. If you want to provide all the things you''d like for yourself and your loved ones, the choice is up to you. Follow the simple instructions in this book and join millions of people who have used José Silva''s pioneering mind training system to change their lives for the better. Sales Power has been a worldwide bestseller for more than 20 years. It has been translated into more than a dozen languages and people around the world have said: Thank you José Silva, for showing me how to change my life for the better. Start NOW There is No Other Way except to begin NOW.

Partial Disability System and Labor Market Adjustment

release date: Jan 01, 2013
Partial Disability System and Labor Market Adjustment
Although partially disabled individuals in Spain are allowed to combine the receipt of disability benefits with a job, the empirical evidence shows that employment rates for this group of individuals are very low. Therefore, in this paper we construct labor market model with search intensity and matching frictions in order to identify the incentives and disincentives to work provided by the partial disability system in Spain from the point of view of both disabled individuals and employers. According to the model, the high employment rate gap observed between non-disabled and disabled workers can be partially explained by the presence of a lower level of productivity and higher searching costs among disabled individuals that discourage them from looking for jobs. Moreover, the design of the Spanish Disability System also contributes in explaining this gap. We also analyze the role of business cycle conditions in shaping the labor market transitions of disabled individuals.

Analog Circuit Design for Process Variation-Resilient Systems-on-a-Chip

release date: Mar 08, 2012
Analog Circuit Design for Process Variation-Resilient Systems-on-a-Chip
This book describes several techniques to address variation-related design challenges for analog blocks in mixed-signal systems-on-chip. The methods presented are results from recent research works involving receiver front-end circuits, baseband filter linearization, and data conversion. These circuit-level techniques are described, with their relationships to emerging system-level calibration approaches, to tune the performances of analog circuits with digital assistance or control. Coverage also includes a strategy to utilize on-chip temperature sensors to measure the signal power and linearity characteristics of analog/RF circuits, as demonstrated by test chip measurements. Describes a variety of variation-tolerant analog circuit design examples, including from RF front-ends, high-performance ADCs and baseband filters; Includes built-in testing techniques, linked to current industrial trends; Balances digitally-assisted performance tuning with analog performance tuning and mismatch reduction approaches; Describes theoretical concepts as well as experimental results for test chips designed with variation-aware techniques.

Gândeşte şi fii în formă

release date: Jan 01, 2012

Misterul cheilor regatului

release date: Jan 01, 2011

Anticiparea viitorului

release date: Jan 01, 2011

Interior penalty approximation for optimal control problems. Optimality conditions in stochastic optimal control theory

release date: Jan 01, 2010
Interior penalty approximation for optimal control problems. Optimality conditions in stochastic optimal control theory
Résumé français : Cette thèse est divisée en deux parties. Dans la première partie on s''intéresse aux problèmes de commande optimale déterministes et on étudie des approximations intérieures pour deux problèmes modèles avec des contraintes de non-négativité sur la commande. Le premier modèle est un problème de commande optimale dont la fonction de coût est quadratique et dont la dynamique est régie par une équation différentielle ordinaire. Pour une classe générale de fonctions de pénalité intérieure, on montre comment calculer le terme principal du développement ponctuel de l''état et de l''état adjoint. Notre argument principal se fonde sur le fait suivant: si la commande optimale pour le problème initial satisfait les conditions de complémentarité stricte pour le Hamiltonien sauf en un nombre fini d''instants, les estimations pour le problème de commande optimale pénalisé peuvent être obtenues à partir des estimations pour un problème stationnaire associé. Nos résultats fournissent plusieurs types de mesures de qualité de l''approximation pour la technique de pénalisation: estimations des erreurs de la commande , estimations des erreurs pour l''état et l''état adjoint et aussi estimations de erreurs pour la fonction valeur. Le second modèle est le problème de commande optimale d''une équation semi-linéaire elliptique avec conditions de Dirichlet homogène au bord, la commande étant distribuée sur le domaine et positive. L''approche est la même que pour le premier modèle, c''est-à-dire que l''on considère une famille de problèmes pénalisés, dont la solution définit une trajectoire centrale qui converge vers la solution du problème initial. De cette manière, on peut étendre les résultats, obtenus dans le cadre d''équations différentielles, au contrôle optimal d''équations elliptiques semi-linéaires. Dans la deuxième partie on s''intéresse aux problèmes de commande optimale stochastiques. Dans un premier temps, on considère un problème linéaire quadratique stochastique avec des contraintes de non-negativité sur la commande et on étend les estimations d''erreur pour l''approximation par pénalisation logarithmique. La preuve s''appuie sur le principe de Pontriaguine stochastique et un argument de dualité. Ensuite, on considère un problème de commande stochastique général avec des contraintes convexes sur la commande. L''approche dite variationnelle nous permet d''obtenir un développement au premier et au second ordre pour l''état et la fonction de coût, autour d''un minimum local. Avec ces développements on peut montrer des conditions générales d''optimalité de premier ordre et, sous une hypothèse géométrique sur l''ensemble des contraintes, des conditions nécessaires du second ordre sont aussi établies.
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