Author: Giancarlo C. Righini
Publisher: World Scientific
ISBN: 9812834133
Category : Technology & Engineering
Languages : en
Pages : 585
Book Description
"Preface -- Part I: Optoelectronic Sensors Technologies -- 1. Fiber and Integrated Optics Sensors: Fundamentals and Applications G. C. Righini, A. G. Mignani, I. Cacciari and M. Brenci -- 1. Introduction -- 2. Fiber and Integrated Optics: Fundamentals of Waveguiding -- 3. Waveguide Sensors: Basic Working Principle -- 4. Fiber Optic Sensors -- 5. Long-Period Optical Fiber Grating Sensors -- 6. Micro-structured Fiber Sensors -- 7. Integrated Optic Sensors -- 8. Conclusions -- References -- 2. Fiber Bragg Grating Sensors: Industrial Applications C. Ambrosino, A. Iadicicco, S. Campopiano, A. Cutolo, M. Giordano and A. Cusano -- 1. Introduction -- 2. Fiber Bragg Gratings History -- 3. Fiber Bragg Gratings as Sensors -- 4. Civil Applications -- 5. Aerospace Applications -- 6. Energy Applications -- 7. Oil and Gas Applications -- 8. Transport Applications -- 9. Underwater Applications -- 10. Perspective and Challenges -- References -- 3. Distributed Optical Fiber Sensors R. Bernini, A. Minardo and L. Zeni -- 1. Introduction -- 2. Linear Backscattering Systems -- 3. Non-Linear Backscattering Systems -- 4. Non-Linear Forward-Scattering Systems -- 5. Conclusions -- References -- 4. Lightwave Technologies for Interrogation Systems of Fiber Bragg Gratings Sensors D. Donisi, R. Beccherelli and A. d'Alessandro -- 1. Introduction -- 2. Operating Principle of the Fiber Bragg Grating Sensor -- 3. FBG Interrogation Techniques -- 4. An Integrated Tunable Filter using Composite Holographic Grating -- 5. POLICRYPS Filterbased FBG Sensors Interrogation -- 6. Conclusions -- Acknowledgments -- References -- 5. Surface Plasmon Resonance: Applications in Sensors and Biosensors R. Rella and M. G. Manera -- 1. Introduction -- 2. SPR Theory -- 3. Optical Sensors based on Surface Plasmon Resonance -- 4. Application of SPR in Chemical Sensors and Biosensors -- 5. SPR Instrumentation: From Traditional SPR Instrument to SPR Imaging -- 6. Future Capabilities -- References -- 6. Microresonators for Sensing Applications S. Berneschi, G. Nunzi Conti, S. Pelli and S. Soria -- 1. Introduction -- 2. Whispering Gallery Modes in a Microsphere -- 3. WGM Resonators: Applications in Sensing -- Acknowledgments -- References -- 7. Photonic Crystals: Towards a Novel Generation of Integrated Optical Devices for Chemical and Biological Detection A. Ricciardi, C. Ciminelli, M. Pisco, S. Campopiano, C. E. Campanella, E. Scivittaro, M. N. Armenise, A. Cutolo and A. Cusano -- 1. Introduction -- 2. Photonic Crystals 190; Fundamental Principles -- 3. Functional Photonic Band Gap Components and Devices -- 4. Photonic Crystals for Chemical and Biological Sensing -- 5. Photonic Crystal Fibers Sensors -- 6. Perspectives and Challenges -- References -- 8. Micromachining Technologies for Sensor Applications P. M. Sarro, A. Irace and P. J. French -- 1. Introduction -- 2. Bulk Micromachining -- 3. Surface Micromachining -- 4. Characterization of Thin Film Membranes -- 5. Conclusions and Outlook -- References -- 9. Spectroscopic Techniques for Sensors S. Pelli, A. Chiasera, M. Ferrari and G. C. Righini -- 1. Introduction -- 2. Absorption, Reflectance and Transmission Measurements -- 3. Luminescence Measurements -- 4. Raman and Brillouin Measurements -- 5. Conclusions -- References -- 10. Laser Doppler Vibrometry P. Castellini, G. M. Revel". -- OCLC.
An Introduction to Optoelectronic Sensors
Author: Giancarlo C. Righini
Publisher: World Scientific
ISBN: 9812834133
Category : Technology & Engineering
Languages : en
Pages : 585
Book Description
"Preface -- Part I: Optoelectronic Sensors Technologies -- 1. Fiber and Integrated Optics Sensors: Fundamentals and Applications G. C. Righini, A. G. Mignani, I. Cacciari and M. Brenci -- 1. Introduction -- 2. Fiber and Integrated Optics: Fundamentals of Waveguiding -- 3. Waveguide Sensors: Basic Working Principle -- 4. Fiber Optic Sensors -- 5. Long-Period Optical Fiber Grating Sensors -- 6. Micro-structured Fiber Sensors -- 7. Integrated Optic Sensors -- 8. Conclusions -- References -- 2. Fiber Bragg Grating Sensors: Industrial Applications C. Ambrosino, A. Iadicicco, S. Campopiano, A. Cutolo, M. Giordano and A. Cusano -- 1. Introduction -- 2. Fiber Bragg Gratings History -- 3. Fiber Bragg Gratings as Sensors -- 4. Civil Applications -- 5. Aerospace Applications -- 6. Energy Applications -- 7. Oil and Gas Applications -- 8. Transport Applications -- 9. Underwater Applications -- 10. Perspective and Challenges -- References -- 3. Distributed Optical Fiber Sensors R. Bernini, A. Minardo and L. Zeni -- 1. Introduction -- 2. Linear Backscattering Systems -- 3. Non-Linear Backscattering Systems -- 4. Non-Linear Forward-Scattering Systems -- 5. Conclusions -- References -- 4. Lightwave Technologies for Interrogation Systems of Fiber Bragg Gratings Sensors D. Donisi, R. Beccherelli and A. d'Alessandro -- 1. Introduction -- 2. Operating Principle of the Fiber Bragg Grating Sensor -- 3. FBG Interrogation Techniques -- 4. An Integrated Tunable Filter using Composite Holographic Grating -- 5. POLICRYPS Filterbased FBG Sensors Interrogation -- 6. Conclusions -- Acknowledgments -- References -- 5. Surface Plasmon Resonance: Applications in Sensors and Biosensors R. Rella and M. G. Manera -- 1. Introduction -- 2. SPR Theory -- 3. Optical Sensors based on Surface Plasmon Resonance -- 4. Application of SPR in Chemical Sensors and Biosensors -- 5. SPR Instrumentation: From Traditional SPR Instrument to SPR Imaging -- 6. Future Capabilities -- References -- 6. Microresonators for Sensing Applications S. Berneschi, G. Nunzi Conti, S. Pelli and S. Soria -- 1. Introduction -- 2. Whispering Gallery Modes in a Microsphere -- 3. WGM Resonators: Applications in Sensing -- Acknowledgments -- References -- 7. Photonic Crystals: Towards a Novel Generation of Integrated Optical Devices for Chemical and Biological Detection A. Ricciardi, C. Ciminelli, M. Pisco, S. Campopiano, C. E. Campanella, E. Scivittaro, M. N. Armenise, A. Cutolo and A. Cusano -- 1. Introduction -- 2. Photonic Crystals 190; Fundamental Principles -- 3. Functional Photonic Band Gap Components and Devices -- 4. Photonic Crystals for Chemical and Biological Sensing -- 5. Photonic Crystal Fibers Sensors -- 6. Perspectives and Challenges -- References -- 8. Micromachining Technologies for Sensor Applications P. M. Sarro, A. Irace and P. J. French -- 1. Introduction -- 2. Bulk Micromachining -- 3. Surface Micromachining -- 4. Characterization of Thin Film Membranes -- 5. Conclusions and Outlook -- References -- 9. Spectroscopic Techniques for Sensors S. Pelli, A. Chiasera, M. Ferrari and G. C. Righini -- 1. Introduction -- 2. Absorption, Reflectance and Transmission Measurements -- 3. Luminescence Measurements -- 4. Raman and Brillouin Measurements -- 5. Conclusions -- References -- 10. Laser Doppler Vibrometry P. Castellini, G. M. Revel". -- OCLC.
Publisher: World Scientific
ISBN: 9812834133
Category : Technology & Engineering
Languages : en
Pages : 585
Book Description
"Preface -- Part I: Optoelectronic Sensors Technologies -- 1. Fiber and Integrated Optics Sensors: Fundamentals and Applications G. C. Righini, A. G. Mignani, I. Cacciari and M. Brenci -- 1. Introduction -- 2. Fiber and Integrated Optics: Fundamentals of Waveguiding -- 3. Waveguide Sensors: Basic Working Principle -- 4. Fiber Optic Sensors -- 5. Long-Period Optical Fiber Grating Sensors -- 6. Micro-structured Fiber Sensors -- 7. Integrated Optic Sensors -- 8. Conclusions -- References -- 2. Fiber Bragg Grating Sensors: Industrial Applications C. Ambrosino, A. Iadicicco, S. Campopiano, A. Cutolo, M. Giordano and A. Cusano -- 1. Introduction -- 2. Fiber Bragg Gratings History -- 3. Fiber Bragg Gratings as Sensors -- 4. Civil Applications -- 5. Aerospace Applications -- 6. Energy Applications -- 7. Oil and Gas Applications -- 8. Transport Applications -- 9. Underwater Applications -- 10. Perspective and Challenges -- References -- 3. Distributed Optical Fiber Sensors R. Bernini, A. Minardo and L. Zeni -- 1. Introduction -- 2. Linear Backscattering Systems -- 3. Non-Linear Backscattering Systems -- 4. Non-Linear Forward-Scattering Systems -- 5. Conclusions -- References -- 4. Lightwave Technologies for Interrogation Systems of Fiber Bragg Gratings Sensors D. Donisi, R. Beccherelli and A. d'Alessandro -- 1. Introduction -- 2. Operating Principle of the Fiber Bragg Grating Sensor -- 3. FBG Interrogation Techniques -- 4. An Integrated Tunable Filter using Composite Holographic Grating -- 5. POLICRYPS Filterbased FBG Sensors Interrogation -- 6. Conclusions -- Acknowledgments -- References -- 5. Surface Plasmon Resonance: Applications in Sensors and Biosensors R. Rella and M. G. Manera -- 1. Introduction -- 2. SPR Theory -- 3. Optical Sensors based on Surface Plasmon Resonance -- 4. Application of SPR in Chemical Sensors and Biosensors -- 5. SPR Instrumentation: From Traditional SPR Instrument to SPR Imaging -- 6. Future Capabilities -- References -- 6. Microresonators for Sensing Applications S. Berneschi, G. Nunzi Conti, S. Pelli and S. Soria -- 1. Introduction -- 2. Whispering Gallery Modes in a Microsphere -- 3. WGM Resonators: Applications in Sensing -- Acknowledgments -- References -- 7. Photonic Crystals: Towards a Novel Generation of Integrated Optical Devices for Chemical and Biological Detection A. Ricciardi, C. Ciminelli, M. Pisco, S. Campopiano, C. E. Campanella, E. Scivittaro, M. N. Armenise, A. Cutolo and A. Cusano -- 1. Introduction -- 2. Photonic Crystals 190; Fundamental Principles -- 3. Functional Photonic Band Gap Components and Devices -- 4. Photonic Crystals for Chemical and Biological Sensing -- 5. Photonic Crystal Fibers Sensors -- 6. Perspectives and Challenges -- References -- 8. Micromachining Technologies for Sensor Applications P. M. Sarro, A. Irace and P. J. French -- 1. Introduction -- 2. Bulk Micromachining -- 3. Surface Micromachining -- 4. Characterization of Thin Film Membranes -- 5. Conclusions and Outlook -- References -- 9. Spectroscopic Techniques for Sensors S. Pelli, A. Chiasera, M. Ferrari and G. C. Righini -- 1. Introduction -- 2. Absorption, Reflectance and Transmission Measurements -- 3. Luminescence Measurements -- 4. Raman and Brillouin Measurements -- 5. Conclusions -- References -- 10. Laser Doppler Vibrometry P. Castellini, G. M. Revel". -- OCLC.
An Introduction to Optoelectronic Sensors
Author: Giancarlo C. Righini
Publisher: World Scientific
ISBN: 9812834125
Category : Science
Languages : en
Pages : 585
Book Description
This invaluable book offers a comprehensive overview of the technologies and applications of optoelectronic sensors. Based on the R&D experience of more than 70 engineers and scientists, highly representative of the Italian academic and industrial community in this area, this book provides a broad and accurate description of the state-of-the-art optoelectronic technologies for sensing. The most innovative approaches, such as the use of photonic crystals, squeezed states of light and microresonators for sensing, are considered. Application areas range from environment to medicine and healthcare, from aeronautics, space, and defence to food and agriculture. Written in a self-contained manner, this volume presents both the sensing methodologies and the fundamental of the various technologies, as well as their applications in the real world.
Publisher: World Scientific
ISBN: 9812834125
Category : Science
Languages : en
Pages : 585
Book Description
This invaluable book offers a comprehensive overview of the technologies and applications of optoelectronic sensors. Based on the R&D experience of more than 70 engineers and scientists, highly representative of the Italian academic and industrial community in this area, this book provides a broad and accurate description of the state-of-the-art optoelectronic technologies for sensing. The most innovative approaches, such as the use of photonic crystals, squeezed states of light and microresonators for sensing, are considered. Application areas range from environment to medicine and healthcare, from aeronautics, space, and defence to food and agriculture. Written in a self-contained manner, this volume presents both the sensing methodologies and the fundamental of the various technologies, as well as their applications in the real world.
Nano Optoelectronic Sensors and Devices
Author: Ning Xi
Publisher: William Andrew
ISBN: 1437734715
Category : Technology & Engineering
Languages : en
Pages : 273
Book Description
Nanophotonics has emerged as a major technology and applications domain, exploiting the interaction of light-emitting and light-sensing nanostructured materials. These devices are lightweight, highly efficient, low on power consumption, and are cost effective to produce. The authors of this book have been involved in pioneering work in manufacturing photonic devices from carbon nanotube (CNT) nanowires and provide a series of practical guidelines for their design and manufacture, using processes such as nano-robotic manipulation and assembly methods. They also introduce the design and operational principles of opto-electrical sensing devices at the nano scale. Thermal annealing and packaging processes are also covered, as key elements in a scalable manufacturing process. Examples of applications of different nanowire based photonic devices are presented. These include applications in the fields of electronics (e.g. FET, CNT Schotty diode) and solar energy. Discusses opto-electronic nanomaterials, characterization and properties from an engineering perspective, enabling the commercialization of key emerging technologies Provides scalable techniques for nanowire structure growth, manipulation and assembly (i.e. synthesis) Explores key application areas such as sensing, electronics and solar energy
Publisher: William Andrew
ISBN: 1437734715
Category : Technology & Engineering
Languages : en
Pages : 273
Book Description
Nanophotonics has emerged as a major technology and applications domain, exploiting the interaction of light-emitting and light-sensing nanostructured materials. These devices are lightweight, highly efficient, low on power consumption, and are cost effective to produce. The authors of this book have been involved in pioneering work in manufacturing photonic devices from carbon nanotube (CNT) nanowires and provide a series of practical guidelines for their design and manufacture, using processes such as nano-robotic manipulation and assembly methods. They also introduce the design and operational principles of opto-electrical sensing devices at the nano scale. Thermal annealing and packaging processes are also covered, as key elements in a scalable manufacturing process. Examples of applications of different nanowire based photonic devices are presented. These include applications in the fields of electronics (e.g. FET, CNT Schotty diode) and solar energy. Discusses opto-electronic nanomaterials, characterization and properties from an engineering perspective, enabling the commercialization of key emerging technologies Provides scalable techniques for nanowire structure growth, manipulation and assembly (i.e. synthesis) Explores key application areas such as sensing, electronics and solar energy
Optical Sensors
Author: Jörg Haus
Publisher: John Wiley & Sons
ISBN: 9783527629442
Category : Science
Languages : en
Pages : 189
Book Description
Providing an overview of the necessary components and the range of applications from light-barriers to high-resolution surface-scanning interferometers, this is a valuable introduction to the technology of optical sensors as well as a reference for experienced practitioners. The first part of the book introduces readers to the basics of sensor principles by describing the most important components that can be found in all optical sensors. Based on this opto-electronic toolbox, the second part then goes on to give numerous examples of optical sensors with respect to their applications.
Publisher: John Wiley & Sons
ISBN: 9783527629442
Category : Science
Languages : en
Pages : 189
Book Description
Providing an overview of the necessary components and the range of applications from light-barriers to high-resolution surface-scanning interferometers, this is a valuable introduction to the technology of optical sensors as well as a reference for experienced practitioners. The first part of the book introduces readers to the basics of sensor principles by describing the most important components that can be found in all optical sensors. Based on this opto-electronic toolbox, the second part then goes on to give numerous examples of optical sensors with respect to their applications.
Optoelectronic Sensors
Author: Didier Decoster
Publisher: John Wiley & Sons
ISBN: 1118622928
Category : Technology & Engineering
Languages : en
Pages : 246
Book Description
Optoelectronic sensors combine optical and electronic systems for numerous applications including pressure sensors, security systems, atmospheric particle measurement, close tolerance measurement, quality control, and more. This title provides an examination of the latest research in photonics and electronics in the areas of sensors.
Publisher: John Wiley & Sons
ISBN: 1118622928
Category : Technology & Engineering
Languages : en
Pages : 246
Book Description
Optoelectronic sensors combine optical and electronic systems for numerous applications including pressure sensors, security systems, atmospheric particle measurement, close tolerance measurement, quality control, and more. This title provides an examination of the latest research in photonics and electronics in the areas of sensors.
Nano Optoelectronic Sensors and Devices
Author: Ning Xi
Publisher: William Andrew
ISBN: 1437734723
Category : Technology & Engineering
Languages : en
Pages : 273
Book Description
Nanophotonics has emerged as a major technology and applications domain, exploiting the interaction of light-emitting and light-sensing nanostructured materials. These devices are lightweight, highly efficient, low on power consumption, and are cost effective to produce. The authors of this book have been involved in pioneering work in manufacturing photonic devices from carbon nanotube (CNT) nanowires and provide a series of practical guidelines for their design and manufacture, using processes such as nano-robotic manipulation and assembly methods. They also introduce the design and operational principles of opto-electrical sensing devices at the nano scale. Thermal annealing and packaging processes are also covered, as key elements in a scalable manufacturing process. Examples of applications of different nanowire based photonic devices are presented. These include applications in the fields of electronics (e.g. FET, CNT Schotty diode) and solar energy. - Discusses opto-electronic nanomaterials, characterization and properties from an engineering perspective, enabling the commercialization of key emerging technologies - Provides scalable techniques for nanowire structure growth, manipulation and assembly (i.e. synthesis) - Explores key application areas such as sensing, electronics and solar energy
Publisher: William Andrew
ISBN: 1437734723
Category : Technology & Engineering
Languages : en
Pages : 273
Book Description
Nanophotonics has emerged as a major technology and applications domain, exploiting the interaction of light-emitting and light-sensing nanostructured materials. These devices are lightweight, highly efficient, low on power consumption, and are cost effective to produce. The authors of this book have been involved in pioneering work in manufacturing photonic devices from carbon nanotube (CNT) nanowires and provide a series of practical guidelines for their design and manufacture, using processes such as nano-robotic manipulation and assembly methods. They also introduce the design and operational principles of opto-electrical sensing devices at the nano scale. Thermal annealing and packaging processes are also covered, as key elements in a scalable manufacturing process. Examples of applications of different nanowire based photonic devices are presented. These include applications in the fields of electronics (e.g. FET, CNT Schotty diode) and solar energy. - Discusses opto-electronic nanomaterials, characterization and properties from an engineering perspective, enabling the commercialization of key emerging technologies - Provides scalable techniques for nanowire structure growth, manipulation and assembly (i.e. synthesis) - Explores key application areas such as sensing, electronics and solar energy
Plastic Optical Fiber Sensors
Author: Marcelo M. Werneck
Publisher: CRC Press
ISBN: 1351580574
Category : Science
Languages : en
Pages : 449
Book Description
Plastic Optical Fiber Sensors cover the fundamentals and applications of a new class of fiber sensors. With contributions from leading academics in the area, this book covers the theory of plastic optical fiber sensors or (POFs), as well as applications in oil, gas, biotechnology, and energy fields. Using multiple examples, the editors showcase the advantageous characteristics of POFs, such as ease of handling, large diameter, inexpensive peripheral components and simple termination tools. By doing so, the editors assert that there has been a proliferation of the use of POFs in new consumer products. The book also highlights uses for building various products, such as a POF sensor for oil trucker valve monitoring, a monitoring system for high voltage substation switch, an oil leaking sensor for offshore platforms and a solar tracker for illumination. Including over 300 black and white images, this book would be highly beneficial for professionals in manufacturing as well as academics in universities, particularly those who use optical fiber sensors on a regular basis.
Publisher: CRC Press
ISBN: 1351580574
Category : Science
Languages : en
Pages : 449
Book Description
Plastic Optical Fiber Sensors cover the fundamentals and applications of a new class of fiber sensors. With contributions from leading academics in the area, this book covers the theory of plastic optical fiber sensors or (POFs), as well as applications in oil, gas, biotechnology, and energy fields. Using multiple examples, the editors showcase the advantageous characteristics of POFs, such as ease of handling, large diameter, inexpensive peripheral components and simple termination tools. By doing so, the editors assert that there has been a proliferation of the use of POFs in new consumer products. The book also highlights uses for building various products, such as a POF sensor for oil trucker valve monitoring, a monitoring system for high voltage substation switch, an oil leaking sensor for offshore platforms and a solar tracker for illumination. Including over 300 black and white images, this book would be highly beneficial for professionals in manufacturing as well as academics in universities, particularly those who use optical fiber sensors on a regular basis.
Optoelectronic Organic-Inorganic Semiconductor Heterojunctions
Author: Ye Zhou
Publisher: CRC Press
ISBN: 1000325717
Category : Technology & Engineering
Languages : en
Pages : 382
Book Description
Optoelectronic Organic-Inorganic Semiconductor Heterojunctions summarizes advances in the development of organic-inorganic semiconductor heterojunctions, points out challenges and possible solutions for material/device design, and evaluates prospects for commercial applications. Introduces the concept and basic mechanism of semiconductor heterojunctions Describes a series of organic-inorganic semiconductor heterojunctions with desirable electrical and optical properties for optoelectronic devices Discusses typical devices such as solar cells, photo-detectors, and optoelectronic memories Outlines the materials and device challenges as well as possible strategies to promote the commercial translation of semiconductor heterojunctions-based optoelectronic devices Aimed at graduate students and researchers working in solid-state materials and electronics, this book offers a comprehensive yet accessible view of the state of the art and future directions.
Publisher: CRC Press
ISBN: 1000325717
Category : Technology & Engineering
Languages : en
Pages : 382
Book Description
Optoelectronic Organic-Inorganic Semiconductor Heterojunctions summarizes advances in the development of organic-inorganic semiconductor heterojunctions, points out challenges and possible solutions for material/device design, and evaluates prospects for commercial applications. Introduces the concept and basic mechanism of semiconductor heterojunctions Describes a series of organic-inorganic semiconductor heterojunctions with desirable electrical and optical properties for optoelectronic devices Discusses typical devices such as solar cells, photo-detectors, and optoelectronic memories Outlines the materials and device challenges as well as possible strategies to promote the commercial translation of semiconductor heterojunctions-based optoelectronic devices Aimed at graduate students and researchers working in solid-state materials and electronics, this book offers a comprehensive yet accessible view of the state of the art and future directions.
Optical Sensors
Author: Ramaier Narayanaswamy
Publisher: Springer Science & Business Media
ISBN: 3662091119
Category : Science
Languages : en
Pages : 438
Book Description
This interesting book covers latest aspects of a highly sophisticated technology; results treated in critical detail; demonstrates applicability of this technology to practical problems in process control, biochip methods, clinical analysis, environmental sciences
Publisher: Springer Science & Business Media
ISBN: 3662091119
Category : Science
Languages : en
Pages : 438
Book Description
This interesting book covers latest aspects of a highly sophisticated technology; results treated in critical detail; demonstrates applicability of this technology to practical problems in process control, biochip methods, clinical analysis, environmental sciences
Optical Sensors
Author: José Miguel López-Higuera
Publisher: Ed. Universidad de Cantabria
ISBN: 9788481021974
Category : Science
Languages : en
Pages : 268
Book Description
Diversos especialistas internacionales exponen las aplicaciones de sensores de fibra óptica en campos tan diversos como la ingeniería civil, energía nuclear, medio ambiente...
Publisher: Ed. Universidad de Cantabria
ISBN: 9788481021974
Category : Science
Languages : en
Pages : 268
Book Description
Diversos especialistas internacionales exponen las aplicaciones de sensores de fibra óptica en campos tan diversos como la ingeniería civil, energía nuclear, medio ambiente...