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Computerphysik: Einführung, Beispiele und Anwendungen
by Stefan GerlachDieses Lehrbuch bietet dem Leser eine aktuelle Einführung in das Lösen von physikalischen Problemen mit dem Computer. Die Grundlagen der Computernutzung, der Programmierung sowie der wichtigsten numerischen Methoden werden besprochen und anhand vieler Beispiele und Übungsaufgaben mit zunehmendem Bezug zur Physik verdeutlicht. Die Nutzung des Betriebssystems Linux und die Programmierung in C und Python bilden dabei die Schwerpunkte.Der wichtigste Teil des Buches umfasst die Projekte, in denen die zuvor besprochenen Grundlagen auf unterschiedliche Probleme der Physik angewendet werden. Die Projekte beinhalten viele wichtige Beispiele aus der Computerphysik (u.a. den Oszillator und Anfangswertprobleme) und diskutieren deren Anwendungen im Detail. Der Leser erhält damit das nötige Rüstzeug, um selbstständig physikalische Probleme mithilfe des Computers zu lösen. Zahlreiche Übungsaufgaben unterstützen beim Vertiefen des Erlernten.Neben einer Vielzahl an kleinen Ergänzungen und Verbesserungen ist die zweite Auflage um ein zusätzliches Projektkapitel zum Thema Daten- und Signalanalyse erweitert, wobei wichtige Themen wie statistische Methoden, Filtermethoden und Bildanalyse behandelt werden.Dieses Buch ist in erster Linie für Bachelorstudenten der Physik, aber auch anderer naturwissenschaftlicher Fächer gedacht. Es kann aber auch von Lehrern und Dozenten zur eigenen Vorbereitung genutzt werden. Vorkenntnisse auf dem Gebiet setzt dieses Buch nicht voraus. Nur in den Projekten wird auf Wissen aus den Grundvorlesungen der Physik zurückgegriffen.
Computerphysik: Praktische Einführung in computergestützte Physik mit C und Python sowie Numerik anhand von physikalischen Anwendungen
by Stefan GerlachPhysikalische Aufgaben mit dem Computer zu lösen, ist eine zunehmend wichtige Kompetenz. Dieses Lehrbuch führt Sie durch alle erforderlichen Schritte, beginnend bei den Grundlagen von Computern über die Programmierung und Datenverarbeitung hin zu den numerischen Methoden bis zu konkreten physikbezogenen Projekten. Besonderheiten: Mit diesem Buch wird das Grundwissen für wissenschaftliches Arbeiten gelegt, denn Begrifflichkeiten wie Datenkompetenz und Forschungsdatenmanagement inklusive Open Science und Gute wissenschaftliche Praxis sind längst nicht mehr aus der Wissenschaft wegzudenken. Kapitelweise wird das Erlernte mit vielen Beispielen, Übungen mit Lösungen, digitalen Karteikarten sowie Online-Programmcodes verdeutlicht und auf bekannte Probleme der Physik angewandt. Der Inhalt: 1. Einleitung – 2. Hard- und Software – 3. Datenspeicherung – 4. Arbeiten mit Linux – 5. Programmieren in C – 6. Programmieren in Python – 7. Wissenschaftliches Rechnen – 8. Arbeiten mit Daten – 9. Hochleistungsrechner – 10. Zahlendarstellung und Numerische Fehler – 11. Numerische Standardverfahren – 12. Numerik von gewöhnlichen Differenzialgleichungen – 13. Verfahren der linearen Algebra – 14. Zufallszahlen – 15. Der Oszillator – 16. Nichtlineare Dynamik – 17. Randwertprobleme – 18. Anfangswertprobleme – 19. Eigenwertprobleme – 20. Daten- und Signalanalyse – 21. Stochastische Methoden Neuerungen: In der 3. Auflage wurden alle Kapitel aktualisiert, teilweise erweitert und zwei neue zu Datenspeicherung und Datenverarbeitung ergänzt. Kapitelweise wurden Flashcards und Jupyter Notebooks neu eingeführt. Die Zielgruppe: Dieses Buch ist in erster Linie gedacht für Bachelorstudierende der Physik, aber auch anderer naturwissenschaftlicher Fächer sowie deren Lehrende. Vorkenntnisse: Computerwissen, Linux, C, Python u. Git werden nicht vorausgesetzt. Nur in Projekten wird auf Wissen aus den Grundvorlesungen der Physik zurückgegriffen.
Computers (Merit Badge Series #Book 3324)
by Boy Scouts of AmericaThis booklet guides a scout through many aspects of computers. It includes historical info, technical info, and usage info. It is intended to be used for a scout to obtain his computer meritbadge. <P><P><i>Advisory: Bookshare has learned that this book has been discontinued and is no longer being used for the Boy Scouts of America. </i>
Computers (21st Century Skills Library: Global Products)
by Kevin CunninghamFind out how and where computers are manufactured and the journey they take before they end up in homes, schools and offices.
Computers: Understanding Technology (Brief 4th Edition)
by Floyd Fuller Brian LarsonThe book introduces students to the key information technology concepts and the vital technical skills that can help improve their personal and professional lives. Studying this book will help prepare students for the workplace of today--and tomorrow--in which some level of computer skills is often an essential requirement for employment.
Computers and Creativity
by Jon Mccormack Mark D’invernoThis interdisciplinary volume introduces new theories and ideas on creativity from the perspectives of science and art. Featuring contributions from leading researchers, theorists and artists working in artificial intelligence, generative art, creative computing, music composition, and cybernetics, the book examines the relationship between computation and creativity from both analytic and practical perspectives. Each contributor describes innovative new ways creativity can be understood through, and inspired by, computers. The book tackles critical philosophical questions and discusses the major issues raised by computational creativity, including: whether a computer can exhibit creativity independently of its creator; what kinds of creativity are possible in light of our knowledge from computational simulation, artificial intelligence, evolutionary theory and information theory; and whether we can begin to automate the evaluation of aesthetics and creativity in silico. These important, often controversial questions are contextualised by current thinking in computational creative arts practice. Leading artistic practitioners discuss their approaches to working creatively with computational systems in a diverse array of media, including music, sound art, visual art, and interactivity. The volume also includes a comprehensive review of computational aesthetic evaluation and judgement research, alongside discussion and insights from pioneering artists working with computation as a creative medium over the last fifty years. A distinguishing feature of this volume is that it explains and grounds new theoretical ideas on creativity through practical applications and creative practice. Computers and Creativity will appeal to theorists, researchers in artificial intelligence, generative and evolutionary computing, practicing artists and musicians, students and any reader generally interested in understanding how computers can impact upon creativity. It bridges concepts from computer science, psychology, neuroscience, visual art, music and philosophy in an accessible way, illustrating how computers are fundamentally changing what we can imagine and create, and how we might shape the creativity of the future. Computers and Creativity will appeal to theorists, researchers in artificial intelligence, generative and evolutionary computing, practicing artists and musicians, students and any reader generally interested in understanding how computers can impact upon creativity. It bridges concepts from computer science, psychology, neuroscience, visual art, music and philosophy in an accessible way, illustrating how computers are fundamentally changing what we can imagine and create, and how we might shape the creativity of the future.
Computers and Devices for Communication: Proceedings of CODEC 2019 (Lecture Notes in Networks and Systems #147)
by Nikhil Ranjan Das Santu SarkarThis book gathers selected research papers presented at the 7th International Conference on Computers and Devices for Communication (CODEC 2019), held at the Department of Radio Physics and Electronic, University of Calcutta, India, on 19 – 20 December 2019. It includes recent research in the field of nanomaterials, devices and circuits; microwave and light wave technology; communication and space science; and computer applications and control.
Computers and Games: International Conference, CG 2022, Virtual Event, November 22–24, 2022, Revised Selected Papers (Lecture Notes in Computer Science #13865)
by Cameron Browne Akihiro Kishimoto Jonathan SchaefferThis book constitutes the refereed proceedings of the International Conference on Computers and Games, CG 2022, held virtually, during November 22–24, 2022.The 15 full papers included in this book were carefully reviewed and selected from 23 submissions. They were organized in topical sections as follows: classic games, multi-player and multi-action games, solving games, measuring games, decision making in games and puzzles.
Computers and Games: 8th International Conference, CG 2013, Yokohama, Japan, August 13-15, 2013, Revised Selected Papers (Lecture Notes in Computer Science #8427)
by Hiroyuki Iida Aske Plaat H. Jaap HerikThis book constitutes the thoroughly refereed post-conference proceedings of the 8th International Conference on Computers and Games, CG 2013, held in Yokohama, Japan, in August 2013, in conjunction with the 17th Computer and Games Tournament and the 20th World Computer-Chess Championship. The 21 papers presented were carefully reviewed and selected for inclusion in this book. They cover a wide range of topics which are grouped into five classes: Monte Carlo Tree Search and its enhancements; solving and searching; analysis of game characteristic; new approaches; and serious games.
Computers and Games: 9th International Conference, CG 2016, Leiden, The Netherlands, June 29 – July 1, 2016, Revised Selected Papers (Lecture Notes in Computer Science #10068)
by Aske Plaat Walter Kosters Jaap Herik1 feel privileged that the J(jh Advances in Computer Games Conference (ACG 10) takes place in Graz, Styria, Austria. It is the frrst time that Austria acts as host country for this major event. The series of conferences started in Edinburgh, Scotland in 1975 and was then held four times in England, three times in The Netherlands, and once in Germany. The ACG-10 conference in Graz is special in that it is organised together with the 11th World Computer#65533; Chess Championship (WCCC), the Sth Computer Olympiad (CO), and the European Union Y outh Chess Championship. The 11 th WCCC and ACG 10 take place in the Dom im Berg (Dome in the Mountain), a high-tech space with multimedia equipment, located in the Schlossberg, in the centre of the city. The help of many sponsors (large and small) is gratefully acknowledged. They will make the organisation of this conference a success. In particular, 1 would like to thank the European Union for designating Graz as the Cultural Capital of Europe 2003. There are 24 accepted contributions by participants from all over the world: Europe, Japan, USA, and Canada. The specific research results ofthe ACG 10 are expected to tind their way to general applications. The results are described in the pages that follow. The international stature together with the technical importance of this conference reaffrrms the mandate of the International Computer Games Association (ICGA) to represent the computer-games community.
Computers and the Law: An Introduction to Basic Legal Principles and Their Application in Cyberspace
by Robert DunneComputers and the Law provides readers with an introduction to the legal issues associated with computing - particularly in the massively networked context of the Internet. Assuming no previous knowledge of the law or any special knowledge of programming or computer science, this textbook offers undergraduates of all disciplines and professionals in the computing industry an understanding of basic legal principles and an awareness of the peculiarities associated with legal issues in cyberspace. This book introduces readers to the fundamental workings of the law in physical space and suggests the opportunity to create new types of laws with nontraditional goals.
Computers and Writing: The Cyborg Era
by James A. InmanIn this book, James A. Inman explores the landscape of the contemporary computers and writing community. Its six chapters engage critical issues, including redefining the community's generally accepted history, connecting its contemporary innovators with its long-standing spirit of innovation, advocating for increased access and diversity, and more. Between chapters, readers will find "Community Voices" sections, which provide a snapshot of the contemporary computers and writing community and introduce, in a non-hierarchical form, more than 100 of its members from around the world, in their own voices. Computers and Writing: The Cyborg Era features a simultaneous emphasis on individuals, communities, and contexts they share; a creative rethinking of the character and values of the computers and writing community; a holistic exploration of meaning-making; and an activist approach to pedagogy. It is a must-read book for anyone interested in rhetoric, technology, and pedagogy, including faculty, graduate students, and colleagues in professions outside the academy.
Computers As Assistants: A New Generation of Support Systems (Computers, Cognition, And Work Ser.)
by Peter HoschkaComputer systems based on the notion of the computer as assistant have recently become the focus of intense interest. The expanding role of the computer in everyday life and the growing number of untrained users make it necessary to think about new ways of dividing labor between humans and machines. Future systems must take on more tasks and perform them more competently and autonomously than existing systems. If they are to be adequately flexible and responsive to complexity, they cannot automate their performance completely. The aim of designers should be to create computer systems with capabilities similar to those of good assistants in the real world. Effective assistance has many characteristics. An assistant is expected to be competent in some domains of expertise, to know the limits of his/her knowledge, to be able to process inexact instructions from clients, to adjust to and learn from them, to explain his/her behavior and suggestions, and to support clients in communication and cooperation with other people. This book believes that such capabilities can be built into computer systems. To that end, the chapter contributors discuss the concepts and methods--particularly from the fields of artificial intelligence and computer-supported cooperative work (CSCW)--that they have drawn from to develop successful system prototypes. They present several of these prototypes including assistants for graphics design, knowledge discovery in data bases, coordination support, organizational memory, user interface design, and knowledge base construction. As such, this volume helps map out the future for all those involved in computer systems design.
Computers As Cognitive Tools: Volume II No More Walls (Technology And Education Ser.)
by Susanne P. LajoieSince the publication of the first edition of Computers as Cognitive Tools in 1993, rapid changes have taken place in the uses of technology for educational purposes and in the theories underlying such uses. Changes in perspectives on thinking and learning are guiding the instructional design of computer-based learning environments. Computers as Cognitive Tools, Volume II: No More Walls provides examples of state-of-the-art technology-based research in the field of education and training. These examples are theory-driven and reflect the learning paradigms that are currently in use in cognitive science. The learning theories, which consider the nature of individual learning, as well as how knowledge is constructed in social situations, include information processing, constructivism, and situativity. Contributors to this volume demonstrate some variability in their choice of guiding learning paradigms. This allows readers the opportunity to examine how such paradigms are operationalized and validated. An array of instructional and assessment approaches are described, along with new techniques for automating the design and assessment process. New considerations are offered as possibilities for examining learning in distributed situations. A multitude of subject matter areas are covered, including scientific reasoning and inquiry in biology, physics, medicine, electricity, teacher education, programming, and hypermedia composition in the social sciences and ecology. This volume reconsiders the initial "camp" analogy posited in 1993 edition of Computers as Cognitive Tools, and presents a mechanism for breaking camp to find new summits.
Computers As Cognitive Tools: Volume Ii, No More Walls (Technology and Education Series)
by Susanne P. Lajoie Sharon J. DerryHighlighting and illustrating several important and interesting theoretical trends that have emerged in the continuing development of instructional technology, this book's organizational framework is based on the notion of two opposing camps. One evolves out of the intelligent tutoring movement, which employs artificial-intelligence technologies in the service of student modeling and precision diagnosis, and the other emerges from a constructivist/developmental perspective that promotes exploration and social interaction, but tends to reject the methods and goals of the student modelers. While the notion of opposing camps tends to create an artificial rift between groups of researchers, it represents a conceptual distinction that is inherently more interesting and informative than the relatively meaningless divide often drawn between "intelligent" and "unintelligent" instructional systems. An evident trend is that researchers in both "camps" view their computer learning environments as "cognitive tools" that can enhance learning, performance, and understanding. Cognitive tools are objects provided by the instructional environment that allow students to incorporate new auxiliary methods or symbols into their social problem solving which otherwise would be unavailable. A final section of the book represents researchers who are assimilating and accommodating the wisdom and creativity of their neighbors from both camps, perhaps forming the look of technology for the future. When the idea of model tracing in a computer-based environment is combined with appreciation for creative mind-extension cognitive tools and for how a community of learners can facilitate learning, a camp is created where AI technologists and social constructivist learning theorists can feel equally at home.
Computers, Communication, and Mental Models
by DONALD L. DAY; DIANE K. KOVACSComputers, Commmunication, and Mental Models is a far-ranging, focused treatment of the cognitive and behavioural issues in computer-mediated communication, knowledge representation and computer-supported co- operative work. It is also an argued development of the theoretical bases for treating computerized tools as intermediaries in the communication of mental maps between tool builders and users.Empirical trails are reported in detail sufficient for representation, in computer-based instruction, fractal dimensions of cognitive mapping and group decision support. The book is a collection of multidisciplinary papers which each shed light on the complex interactions between users and systems architects, via a common medium: computerized tools.
Computers & Communication Technology Part 2 class 11 - NCERT
by National Council of Educational Research and TrainingPublished by the NCERT, the book Computers and Communication Technology part 2 for std 11 will help students understand the different basic concepts of computers, Java script, coding and the internet. Written in simple english language the book follows the guidelines of the CBSE board.
Computers, Curriculum, and Cultural Change: An Introduction for Teachers
by Eugene F. Provenzo, Jr. Arlene Brett Gary N. McCloskeyComputers, Curriculum, and Cultural Change: An Introduction for Teachers, Second Edition is a comprehensive introduction to using computers in educational settings. What distinguishes this text from others on the topic is its focus on: *the issue of how computers are redefining our culture and society and the work of schools; *the idea of using the computer as a tool for increasing efficiency and productivity in curriculum; and *the concept of the computer as a tool not only for efficiency, but actually as a means of enhancing intelligence. This text provides students with an introduction to basic computer skills and experience, enhanced by helpful pedagogical aids, including case studies and highlighted features, such as Portfolio Development, Reflective Practice, Computing Timelines, Filmographies, bibliographical sources, and a text-linked glossary of key computer terms. New in the Second Edition: In addition to being thoroughly updated, a new section has been added to Chapter 1, "Creating an Electronic Portfolio," with activities linked to the standards for educational computing established by the International Society for Technology in Education (ISTE). Electronic portfolio activities at the end of each chapter give students the hands-on practical skills they need and, at the same time, cover the necessary theoretical and conceptual material for an introductory educational computing course.
Computers for Seniors: Email, Internet, Photos, and More in 14 Easy Lessons
by Chris Ewin Carrie Ewin Cheryl EwinComputers for Seniors is a step-by-step guide that will take you all the way from pressing the "On" button on your new computer to being a confident user who can send email to family and friends, shop online safely, read the latest news, watch funny YouTube videos, share cute pictures of your grandkids, check the weather forecast, and much more.You’ll learn to:-Plug in, set up, and turn on your computer-Print and share photos of your grandkids, vacations, pets, friends, and special life events-Install helpful tools like a calendar, money manager, and weather tracker-Search the internet for news, recipes, gardening tips, sports updates, and anything else that interests you-Watch entertaining YouTube videos or educational lectures and make video calls to anywhere in the world-Find and listen to new music (or your favorite classics) and read electronic books-Email your friends and family-Stay safe online and keep your private information secureComputers for Seniors will show you how to get what you really want from your PC, with the help of full-color illustrations, friendly instructions, and a touch of humor. Each lesson has small exercises to test your skills and help you practice, to make sure you feel comfortable with what you’ve learned before you move on.It’s never too late to have fun and get more out of your PC—Computers for Seniors will ease you into the computer generation by guiding you every step of the way.
Computers For Seniors For Dummies
by Nancy C. Muirng to use a computer for bookkeeping, making travel pans, socializing, shopping, or just plain fun, this clear and friendly guide takes the intimidation out of computer basics and the ever-evolving technology that surrounds it.Large-print format and drawings make it easy to read and understandIncludes chapter openers that present the tasks covered with associated page numbers to help you find material fastContains the most up-to-date information on the Windows 9 operating systemProvides coverage of Windows 8.1 for those who aren't early adoptersIf you've just purchased your first computer or laptop need a plain-English introduction to getting started, Computers For Seniors For Dummies has you covered.
Computers For Seniors For Dummies
by Nancy C. MuirThe bestselling guide—now in a new edition A computer provides a great resource for learning new things and keeping in touch with family and friends, but it may seem intimidating at first. The bestselling Computers For Seniors For Dummies is here to help the 50+ set conquer and overcome any uncertainty with clear-cut, easy-to-understand guidance on how to confidently navigate your computer and the Windows 10 operating system. Featuring large text and images, it's never been easier for seniors to smoothly click their way around a new PC. Even if you don't know a mouse from a megabyte, this book walks you through all the steps to choosing, setting up, and successfully using your new computer. Begin with learning how to turn the computer on and use the keyboard, and from there you'll progress to effortlessly finding your way around the new Windows 10 operating system. Explore all you can do with a computer: Research topics of interest Keep in touch with loved ones Shop securely online Find recipes and diet tips If you've just purchased your first computer and need a plain-English introduction to getting started, Computers For Seniors For Dummies has you covered.
Computers For Seniors For Dummies
by Faithe WempenA simple guide to computers that'll show you what all the fuss is about Most people new to computers find them a little intimidating at first. But with the right guidance, even a total novice can be sending email and banking online in no time at all. Computers For Seniors For Dummies is your must-have computing companion, full of crystal clear, step-by-step instructions for accessing websites, opening and using programs, and keeping yourself safe from viruses and hackers. And unlike the confusing "tips" from your son-in-law, you can rely on the For Dummies brand to deliver advice that actually works! Whether you've set up your computer and are ready to start using it or it's still sitting in the box, this book walks you through each and every step you need to take to connect with your family or share your photos with your friends on Facebook. It'll also show you how to: Research topics you're interested in on the web while steering clear of malicious websites and emails that can harm your computer Shop online in a way that keeps your credit card info secure Find recipes, diet tips, the latest news, or your favorite TV show Computers For Seniors For Dummies is your one-stop resource for taking control of your computer, transforming it from an expensive paperweight into the most useful gadget in your home. Filled with easy-on-the-eyes type and tons of explanatory images, this is the book that will finally get you up to speed on personal computing.
Computers For Seniors For Dummies
by Faithe WempenBecome a tech-savvy computer user, the beginner-friendly way Computers For Seniors For Dummies gives you the confidence you need to connect with friends and explore the internet all from the comfort of your couch. This step-by-step guide walks you through the basics of buying and setting up a computer, working with Windows or Mac, and getting online. With large print and clear figures, you'll learn essential tasks like emailing, browsing the internet, creating and viewing digital photos, and staying safe from hackers and viruses. In no time you'll be shopping online and video calling family from across the country. Get advice on purchasing a reliable, budget-friendly computer, along with accessories like printers Create formatted documents and spreadsheets and share them with others Organize and share family photos Watch movies and listen to music online Stay safe online, with tips to avoid hackers, scammers, and identity theft Shop online for everything from groceries to life insurance Those older and wiser who need help getting started with computers will love this no-nonsense For Seniors For Dummies guide.
Computers For Seniors For Dummies, 3rd Edition
by Nancy MuirThe bestselling guide to choosing a computer and getting online, fully updated for Windows 8! Whether you use your computer for bookkeeping, making travel plans, socializing, shopping, or just plain fun, computers are now an essential part of daily life. But it can be overwhelming to keep up with the technology as it continually evolves. This clear, friendly guide not only gets you up to speed on computer basics, it also covers the very latest information, like the changes you?ll see with Windows 8. You'll learn to use the keyboard and mouse, navigate the Windows 8 operating system, access the Internet, create documents, keep safe online, and more. Packed with screenshots and illustrations, the new edition of this popular book is easy to follow, never intimidating, and always helpful. Starts with the basics and assumes no prior knowledge of computers Updates your current skills for the latest technology changes, such as the Windows 8 operating system Explains how to connect to the Internet, keep up with family and friends via e-mail and social media, find recipes and health information, book travel, manage your budget, and much more Shows you how to organize documents, work with files and folders, manage pictures and videos, and customize your desktop and system Offers tips and advice to help you avoid common pitfalls Take on technology with confidence and take advantage of all your computer can do with Computers for Seniors For Dummies, 3rd Edition!
Computers Helping People with Special Needs: 18th International Conference, ICCHP-AAATE 2022, Lecco, Italy, July 11–15, 2022, Proceedings, Part II (Lecture Notes in Computer Science #13342)
by Roberto Manduchi Klaus Miesenberger Mario Covarrubias Rodriguez Georgios Kouroupetroglou Katerina Mavrou Petr PenázThe two-volume set LNCS 13341 and 13342 constitutes the refereed proceedings of the Joint International Conference on Digital Inclusion, Assistive Technology, and Accessibility, ICCHP-AAATE 2022. The conference was held in Lecco, Italy, in July 2022. The 112 papers presented were carefully reviewed and selected from 285 submissions. Included also are 18 introductions. The papers are organized in the following topical sections: Part I: Art Karshmer Lectures in Access to Mathematics, Science and Engineering; Digital Solutions for Inclusive Mobility: solutions and accessible maps for indoor and outdoor mobility; implementation and innovation in the area of independent mobility through digital technologies; haptic and digital access to art and artefacts; accessibility of co-located meetings; interactions for text input and alternative pointing; cognitive disabilities and accessibility; augmentative and alternative communication (AAC): emerging trends, opportunities and innovations; language accessibility for the deaf and hard-of-hearing. Part II: Digital accessibility: readability and understandability; serious and fun games; internet of things: services and applications for people with disabilities and elderly persons; technologies for inclusion and participation at work and everyday activities; robotic and virtual reality technologies for children with disabilities and older adults; development, evaluation and assessment of assistive technologies; ICT to support inclusive education – universal learning design (ULD); design for assistive technologies and rehabilitation; assistive technologies and inclusion for older people.