Strutture in legno. Materiale, calcolo e progetto secondo le nuove normative europee

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Publisher : HOEPLI EDITORE
ISBN 13 : 9788820335830
Total Pages : 758 pages
Book Rating : 4.3/5 (358 download)

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Book Synopsis Strutture in legno. Materiale, calcolo e progetto secondo le nuove normative europee by : Maurizio Piazza

Download or read book Strutture in legno. Materiale, calcolo e progetto secondo le nuove normative europee written by Maurizio Piazza and published by HOEPLI EDITORE. This book was released on 2005 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wood Additive Technologies

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Publisher : Springer Nature
ISBN 13 : 3030781364
Total Pages : 193 pages
Book Rating : 4.0/5 (37 download)

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Book Synopsis Wood Additive Technologies by : Federica Brunone

Download or read book Wood Additive Technologies written by Federica Brunone and published by Springer Nature. This book was released on 2021-08-25 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book encodes a vision for the actively sustainable management and development of the built environment by referring to the application of timber-based construction systems as additive solutions for the multi-purpose improvement of existing buildings. It translates this vision into an innovative methodology for the management of the entire building process – from design to production, operation, and maintenance - and the assessment of timber-based construction performances across the whole building life-cycle. This approach is based on a multi-dimensional analysis, which starts from the structure of the Active House (AH) protocol, improved through information-integrated digital environments and multi-criteria evaluation methods, such as BIM and Design Optioneering. During the design stage, indeed, it analyzes and compares different design choices, according to the DO method, until the definition and validation of the “As-Built” step, while in the operational phase, it refers to sensors-retrieved data to show the evolution of the building behaviour, accounting for real users’ interaction, building performances decay and needs of maintenance, defining the digital twin of the building: a real Cognitive Building. Finally, the application of this methodology identifies innovative models of processes, products, and design of wood-based construction technologies, suitable to satisfy the needs of the 2D/3D construction layering for the sustainable transformation of the built environment.

Mediterranean Architecture and the Green-Digital Transition

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Publisher : Springer Nature
ISBN 13 : 3031331486
Total Pages : 701 pages
Book Rating : 4.0/5 (313 download)

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Book Synopsis Mediterranean Architecture and the Green-Digital Transition by : Ali Sayigh

Download or read book Mediterranean Architecture and the Green-Digital Transition written by Ali Sayigh and published by Springer Nature. This book was released on 2023-10-09 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: T​his book contains selected papers presented during the World Renewable Energy Network’s biannual World Med Green Forum (MGF). The 2022 MGF highlights the role of renewable energy applications in the sustainable building sector with a focus on the Mediterranean region as a foundation for a truly positive energy future. MGF is an open roundtable for an international community of researchers, practitioners, and experts to discuss the most innovative and promising sustainable building technologies. The papers presented explore the intersection between twin transitions in policies, programs, projects, and experimentation, with the digital domain innovating the green building sector towards more reliable and inclusive planning and design practices in order to collectively envision future buildings and cities.

European Workshop on Structural Health Monitoring

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Publisher : Springer Nature
ISBN 13 : 3031072588
Total Pages : 1129 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis European Workshop on Structural Health Monitoring by : Piervincenzo Rizzo

Download or read book European Workshop on Structural Health Monitoring written by Piervincenzo Rizzo and published by Springer Nature. This book was released on 2022-06-15 with total page 1129 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of structural health monitoring (SHM) and more broadly in the fields of smart materials and intelligent systems, as presented by leading international researchers and engineers at the 10th European Workshop on Structural Health Monitoring (EWSHM), held in Palermo, Italy on July 4-7, 2022. The volume covers highly diverse topics, including signal processing, smart sensors, autonomous systems, remote sensing and support, UAV platforms for SHM, Internet of Things, Industry 4.0, and SHM for civil structures and infrastructures. The contributions, which are published after a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.

Legno - Criteri di calcolo e aspetti realizzativi

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Publisher : Wolters Kluwer Italia
ISBN 13 : 8867501577
Total Pages : 574 pages
Book Rating : 4.8/5 (675 download)

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Book Synopsis Legno - Criteri di calcolo e aspetti realizzativi by : Cirillo Antonio

Download or read book Legno - Criteri di calcolo e aspetti realizzativi written by Cirillo Antonio and published by Wolters Kluwer Italia. This book was released on 2014 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oggi si assiste ad una rivalutazione del materiale legno, anche grazie all’introduzione sul mercato del legno lamellare, che ha consentito l’impiego su una più vasta gamma di prodotti strutturali e non. Segno di questo rinnovato interesse è l’inserimento del legno all’interno dei materiali da costruzione definiti nelle Norme Tecniche delle Costruzioni (NTC) e la produzione di una normativa europea specifica come l’Eurocodice 5. Il volume soddisfa le esigenze degli specialisti e di coloro che si avvicinano per la prima volta alla materia e affronta in modo semplice e conciso tutti gli aspetti progettuali legati al legno: dalla descrizione del materiale e delle sue caratteristiche, alle indicazioni utili alla redazione del calcolo strutturale sia dell’elemento resistente sia delle connessione, al suo utilizzo in zona sismica, allo studio del suo impiego per l’esecuzione di edifici e ponti. L’opera inoltre contiene riferimenti alle Istruzioni CNR DT 201/2005 e CNR DT 206/2007 Compresi nel prezzo del volume, il software TRAVILOG modulo LEGNO LT di Logical Soft + fogli di calcolo di verifica in Excel personalizzabili, sviluppati dall’Autore. Il software e i fogli di calcolo sono scaricabili dalla pagina www.logical.it/legno.aspxinserendo il codice attivazione stampato a fine volume. Il software TRAVILOG Modulo LEGNO LT progetta e verifica strutture intelaiate in legno massiccio e lamellare fino a 100 nodi. Dotato di una potente interfaccia tridimensionale, il software consente di definire velocemente le geometrie, i materiali e le azioni agenti sulla struttura. Completata l’analisi vengono visualizzate le sollecitazioni per ciascun elemento tecnologico ed effettuate le verifiche di resistenza e di deformabilità. TRAVILOG Modulo LEGNO LT verifica inoltre singole sezioni rettangolari a trazione, compressione (perpendicolare e ortogonale alle fibre), presso-tenso-flessione, taglio, torsione e azioni combinate di torsione e taglio. TRAVILOG Modulo LEGNO LT è la versione didattica del Modulo LEGNO di TRAVILOG TITANIUM 3. Caratteristiche principali di TRAVILOG Modulo LEGNO LT Sezioni parametriche rettangolari;Legno lamellare o massiccio;Verifica a trazione, compressione (perpendicolare e ortogonale alle fibre), presso-tenso flessione, taglio, torsione e azioni combinate di torsione e taglio;Relazione di calcolo completa dei risultati e dei distinti parametri di calcolo. Limitazioni della versione TRAVILOG Modulo LEGNO LT La versione TRAVILOG Modulo LEGNO LT allegata al testo è una versione didattica del programma TRAVILOG TITANIUM 3. Le limitazioni della versione LT sono le seguenti: Modellazione di strutture intelaiate limitata ai 100 nodi di calcolo solo statico;Analisi di sezioni di forma solo rettangolare;Archivio dei materiali non modificabile;Diagrammi e tabelle dei risultati visualizzabili esclusivamente a video; Non sono presenti le verifiche di instabilità, di resistenza al fuoco, le verifiche delle connessioni legno/legno, legno/acciaio e di carpenteria e le verifiche per i solai con sezione mista legno/calcestruzzo. Al volume sono abbinati anche fogli di calcolo di verifica in excel personalizzabili, sviluppati dall’Autore stesso, ing. Antonio Cirillo. I files in excel permettono di ottenere utili calcoli semplificati, conformi alle norme vigenti italiane ed europee, e possono essere allegati alle relazioni di calcolo da effettuare per le strutture. Il programma ricava automaticamente i parametri di resistenza dalle tabelle dei materiali previste dalle norme UNI EN 338. I calcoli sono svolti seguendo l’EC5 e i carichi applicati corrispondono a quelli previsti dalla NTC2008 e dall’EC5 stesso. I fogli di calcolo excel sono i seguenti: Verifiche di sezione lignea rettangolare: Sollecitata da forza normale N di compressione Sollecitata da forza normale N trazione, la verifica è redatta in termini di sollecitazioni Sollecitata da forza normale N trazione, la verifica è redatta in termini di tensioni Sollecitata da forza di taglio V Sollecitata da momento flettente M Sollecitata da forza normale N di compressione e momento flettente M Sollecitata da forza normale N di trazione e momento flettente M Verifiche globali di elementi strutturali: Calcolo di una trave semplicemente appoggiata soggetta a un carico uniforme Calcolo di una trave incastrata agli estremi, soggetta a un carico uniforme Calcolo di un’asta a sezione rettangolare compressa soggetta a carico di punta Calcolo di un’asta a sezione rettangolare pressoinflessa Calcolo solaio in legno completo di verifica a vibrazione Calcolo di una gronda in legno con travetto a sbalzo Calcolo di corrente ligneo del tetto Calcolo di un arcareccio soggetto a un carico uniforme Calcolo di una copertura lignea Passerella pedonale (ponte di III categoria): Calcolo di un ponte pedonale in legno a due travi parallele STRUTTURA Parte I. Materiali e tecnologia del legno Materiali con NTC 2008 Tecnologia del legno Legno massiccio e lamellare Caratteristiche tecnologiche e meccaniche del legno Durabilità del legno Resistenza al fuoco Normative sul legno correlate da EN 1995.1.1 Parte II. Elementi in legno Elementi strutturali Parte III. Calcolo elementi in legno con EC5 NTC 2008 e CNR DT 206/2007 Struttura dell’Eurocodice 5 NTC 2008 e istruzioni CNR DT 206/2007 Principi della progettazione (EC5, par. 2) Azioni Analisi globale della struttura Classi di servizio Combinazioni di carico e resistenza di calcolo Stati limite di servizio (SLE / SLS) Stato limite ultimo Particolari costruttivi e controlli Elementi strutturali composti e travi con sezione particolare Sistemi strutturali Parte IV. Connessioni Tipi di connettori Tipi di parti intermedie Tipi di connessioni Calcolo delle connessioni Collegamento per solai Parte V. Legno in zona sismica Introduzione alla sismica Prescrizioni per strutture in zona sismica Prescrizioni sismiche per il legno Parte VI. Case e costruzioni Tipologie edilizie in legno Calcolo costruzioni in legno Analisi edifici specifici Solai in legno Coperture a tetto in legno Parte VII. Ponti in legno Storia e tipologia di ponti Appendice: Fogli di calcolo in excel Glossario

Structural Timber Design to Eurocode 5

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Publisher : John Wiley & Sons
ISBN 13 : 047069792X
Total Pages : 556 pages
Book Rating : 4.4/5 (76 download)

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Book Synopsis Structural Timber Design to Eurocode 5 by : Jack Porteous

Download or read book Structural Timber Design to Eurocode 5 written by Jack Porteous and published by John Wiley & Sons. This book was released on 2008-05-23 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Timber Design to Eurocode 5 is a comprehensive book which provides practising engineers and specialist contractors with detailed information and in-depth guidance on the design of timber structures based on the common rules and rules for buildings in Eurocode 5 - Part 1-1. It will also be of interest to undergraduate and postgraduate students of civil and structural engineering. The book provides a step-by-step approach to the design of all of the most commonly used timber elements and connections using solid timber, glued laminated timber or wood based structural products. It features numerous detailed worked examples, and incorporates the requirements of the UK National Annex. It covers the strength and stiffness properties of timber and its reconstituted and engineered products; the key requirements of Eurocode 0, Eurocode 1 and Eurocode 5 - Part 1-1; the design of beams and columns of solid timber, glued laminated, composite and thin-webbed sections; the lateral stability requirements of timber structures; and the design of mechanical connections subjected to lateral and/or axial forces as well as rigid and semi-rigid connections subjected to a moment. The Authors Jack Porteous is a consulting engineer specialising in timber engineering. He is a Chartered Engineer, Fellow of the Institution of Civil Engineers and Member of the Institution of Structural Engineers. He is a visiting scholar and lecturer in timber engineering at Napier University. Abdy Kermani is the Professor of Timber Engineering and R&D consultant at Napier University. He is a Chartered Engineer, Member of the Institution of Structural Engineers and Fellow of the Institute of Wood Science with over 20 years' experience in civil and structural engineering research, teaching and practice. The authors have led several research and development programmes on the structural use of timber and its reconstituted products. Their research work in timber engineering is internationally recognised and published widely. Also of Interest Timber Designers' Manual Third Edition E.C. Ozelton & J.A. Baird Paperback 978 14051 4671 5 Cover design by Garth Stewart

The Literature Review

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Publisher : Corwin Press
ISBN 13 : 1452240884
Total Pages : 201 pages
Book Rating : 4.4/5 (522 download)

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Book Synopsis The Literature Review by : Lawrence A. Machi

Download or read book The Literature Review written by Lawrence A. Machi and published by Corwin Press. This book was released on 2012-06-08 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the best-selling book offers graduate students in education and the social sciences a road map to developing and writing an effective literature review for a research project, thesis, or dissertation. Organized around a proven six-step model and incorporating technology into all of the steps, the book provides examples, strategies, and exercises that take students step by step through the entire process: Selecting a topic Searching the literature Developing arguments Surveying the literature Critiquing the literature Writing the literature review The second edition includes key vocabulary words, technology advice, and additional tips on when and how to write during the early stages--including the use of journals and memoranda--to make the literature review process a success.

Materials and Joints in Timber Structures

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Publisher : Springer Science & Business Media
ISBN 13 : 9400778112
Total Pages : 815 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Materials and Joints in Timber Structures by : Simon Aicher

Download or read book Materials and Joints in Timber Structures written by Simon Aicher and published by Springer Science & Business Media. This book was released on 2013-09-25 with total page 815 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the contributions from the RILEM International Symposium on Materials and Joints in Timber Structures that was held in Stuttgart, Germany from October 8 to 10, 2013. It covers recent developments in the materials and the joints used in modern timber structures. Regarding basic wooden materials, the contributions highlight the widened spectrum of products comprising cross-laminated timber, glulam and LVL from hardwoods and block glued elements. Timber concrete compounds, cement bonded wood composites and innovative light-weight constructions represent increasingly employed alternatives for floors, bridges and facades. With regard to jointing technologies, considerable advances in both mechanical connections and glued joints are presented. Self-tapping screws have created unprecedented options for reliable, strong as well as ductile joints and reinforcement technologies. Regarding adhesives, which constitute the basis of the jointing/laminating technology of modern timber products, extended options for tailor-made bonding solutions have to be stated. Apart from melamine-urea and phenolic-resorcinol adhesives, one-component-polyurethanes, emulsion isocyanate polymers and epoxies offer a wide range of possibilities. The contributions dealing with experimental and numerical investigations on static, cyclic and seismic behavior of structures clearly reveal the enhanced potential of modern timber construction for reliable and sustainable buildings and bridges of the new millennium. The book is structured in nine thematic areas, being I) Structures II) Mechanical Connections III) Glued Joints and Adhesives IV) Timber and Concrete/Cement/Polymer Composites V) Cyclic, Seismic Behavior VI) Hardwood, Modified Wood and Bamboo VII) Cross-Laminated Timber VIII) Properties and Testing of Wood IX) Glulam

Structural Rehabilitation of Old Buildings

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Publisher : Springer Science & Business Media
ISBN 13 : 3642396860
Total Pages : 350 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Structural Rehabilitation of Old Buildings by : Aníbal Costa

Download or read book Structural Rehabilitation of Old Buildings written by Aníbal Costa and published by Springer Science & Business Media. This book was released on 2013-09-11 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This present book describes the different construction systems and structural materials and elements within the main buildings typologies, and it analyses the particularities of each of them, including, at the end, general aspects concerning laboratory and in-situ testing, numerical modeling, vulnerability assessment and construction maintenance.

A Forest Journey: The Story of Wood and Civilization

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Publisher : The Countryman Press
ISBN 13 : 1581579152
Total Pages : 644 pages
Book Rating : 4.5/5 (815 download)

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Book Synopsis A Forest Journey: The Story of Wood and Civilization by : John Perlin

Download or read book A Forest Journey: The Story of Wood and Civilization written by John Perlin and published by The Countryman Press. This book was released on 2005-09-20 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: A contemporary view of the effects of wood, as used for building and fuel, and of deforestation on the development of civilization. Until the ascendancy of fossil fuels, wood has been the principal fuel and building material from the dawn of civilization. Its abundance or scarcity greatly shaped, as A Forest Journey ably relates, the culture, demographics, economy, internal and external politics, and technology of successive societies over the millennia. The book's comprehensive coverage of the major role forests have played in human life--told with grace, fluency, imagination, and humor—gained it recognition as a Harvard Classic in Science and World History and as one of Harvard's "One-Hundred Great Books." Others receiving the honor include such luminaries as Stephen Jay Gould and E. O. Wilson. This new paperback edition will add a prologue and an epilogue to reflect the current situation in which forests have become imperative for humanity's survival.

The Suffering of the Immigrant

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Publisher : John Wiley & Sons
ISBN 13 : 1509534040
Total Pages : 360 pages
Book Rating : 4.5/5 (95 download)

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Book Synopsis The Suffering of the Immigrant by : Abdelmalek Sayad

Download or read book The Suffering of the Immigrant written by Abdelmalek Sayad and published by John Wiley & Sons. This book was released on 2018-03-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a major contribution to our understanding of the condition of the immigrant and it will transform the reader’s understanding of the issues surrounding immigration. Sayad’s book will be widely used in courses on race, ethnicity, immigration and identity in sociology, anthropology, cultural studies, politics and geography. an outstanding and original work on the experience of immigration and the kind of suffering involved in living in a society and culture which is not one’s own; describes how immigrants are compelled, out of respect for themselves and the group that allowed them to leave their country of origin, to play down the suffering of emigration; Abdelmalek Sayad, was an Algerian scholar and close associate of the French sociologist Pierre Bourdieu - after Sayad’s death, Bourdieu undertook to assemble these writings for publication; this book will transform the reader’s understanding of the issues surrounding immigration.

Reinforcement of Timber Elements in Existing Structures

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Publisher : Springer Nature
ISBN 13 : 303067794X
Total Pages : 271 pages
Book Rating : 4.0/5 (36 download)

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Book Synopsis Reinforcement of Timber Elements in Existing Structures by : Jorge Branco

Download or read book Reinforcement of Timber Elements in Existing Structures written by Jorge Branco and published by Springer Nature. This book was released on 2021-04-30 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: By presenting the work of the RILEM Technical Committee 245-RTE, the book provides an overview of the existing techniques for the reinforcement of timber elements, joints and structures. It consists of two parts: part I examines state-of-the-art information on reinforcement techniques, summarizes the current status of standardization, and covers STS, GiR, FRP and nanotechnology. In part II several applications of reinforcement are discussed: these include traditional structures, traditional timber frame walls, light-frame shear walls, roofs, floors, and carpentry joints. The book will benefit academics, practitioners, industry and standardization committees interested in the reinforcement of existing timber elements, joints and structures.

Apolline Project Vol. 1

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Publisher : Girolamo F. De Simone
ISBN 13 : 8896055008
Total Pages : 383 pages
Book Rating : 4.8/5 (96 download)

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Book Synopsis Apolline Project Vol. 1 by : Girolamo De Simone

Download or read book Apolline Project Vol. 1 written by Girolamo De Simone and published by Girolamo F. De Simone. This book was released on 2009 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Timber Structures. Joints Made with Mechanical Fasteners. General Principles for the Determination of Strength and Deformation Characteristics

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Publisher :
ISBN 13 : 9780580198564
Total Pages : 12 pages
Book Rating : 4.1/5 (985 download)

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Book Synopsis Timber Structures. Joints Made with Mechanical Fasteners. General Principles for the Determination of Strength and Deformation Characteristics by : British Standards Institute Staff

Download or read book Timber Structures. Joints Made with Mechanical Fasteners. General Principles for the Determination of Strength and Deformation Characteristics written by British Standards Institute Staff and published by . This book was released on 1991-07-31 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood, Structures, Joints, Fasteners, Specimen preparation, Test equipment, Loading, Load capacity, Slip, Deformation, Mechanical testing, Formulae (mathematics), Mechanical behaviour of materials, Adjustment

Architecture : nineteenth and twentieth centuries

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Author :
Publisher : Good Press
ISBN 13 :
Total Pages : 781 pages
Book Rating : 4.4/5 (66 download)

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Book Synopsis Architecture : nineteenth and twentieth centuries by : Henry-Russell Hitchcock

Download or read book Architecture : nineteenth and twentieth centuries written by Henry-Russell Hitchcock and published by Good Press. This book was released on 2023-07-11 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Architecture : nineteenth and twentieth centuries" by Henry-Russell Hitchcock. Published by Good Press. Good Press publishes a wide range of titles that encompasses every genre. From well-known classics & literary fiction and non-fiction to forgotten−or yet undiscovered gems−of world literature, we issue the books that need to be read. Each Good Press edition has been meticulously edited and formatted to boost readability for all e-readers and devices. Our goal is to produce eBooks that are user-friendly and accessible to everyone in a high-quality digital format.

The Imagined Immigrant

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Publisher : Fairleigh Dickinson Univ Press
ISBN 13 : 0838641989
Total Pages : 315 pages
Book Rating : 4.8/5 (386 download)

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Book Synopsis The Imagined Immigrant by : Ilaria Serra

Download or read book The Imagined Immigrant written by Ilaria Serra and published by Fairleigh Dickinson Univ Press. This book was released on 2009 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using original sources--such as newspaper articles, silent movies, letters, autobiographies, and interviews--Ilaria Serra depicts a large tapestry of images that accompanied mass Italian migration to the U.S. at the turn of the twentieth century. She chooses to translate the Italian concept of immaginario with the Latin imago that felicitously blends the double English translation of the word as "imagery" and "imaginary." Imago is a complex knot of collective representations of the immigrant subject, a mental production that finds concrete expression; impalpable, yet real. The "imagined immigrant" walks alongside the real one in flesh and rags.

Plant Genetic Conservation

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Publisher : Springer Science & Business Media
ISBN 13 : 9400914377
Total Pages : 462 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Plant Genetic Conservation by : Nigel Maxted

Download or read book Plant Genetic Conservation written by Nigel Maxted and published by Springer Science & Business Media. This book was released on 2013-12-01 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent development of ideas on biodiversity conservation was already being considered almost three-quarters of a century ago for crop plants and the wild species related to them, by the Russian geneticist N.!. Vavilov. He was undoubtedly the first scientist to understand the impor tance for humankind of conserving for utilization the genetic diversity of our ancient crop plants and their wild relatives from their centres of diversity. His collections showed various traits of adaptation to environ mental extremes and biotypes of crop diseases and pests which were unknown to most plant breeders in the first quarter of the twentieth cen tury. Later, in the 1940s-1960s scientists began to realize that the pool of genetic diversity known to Vavilov and his colleagues was beginning to disappear. Through the replacement of the old, primitive and highly diverse land races by uniform modem varieties created by plant breed ers, the crop gene pool was being eroded. The genetic diversity of wild species was equally being threatened by human activities: over-exploita tion, habitat destruction or fragmentation, competition resulting from the introduction of alien species or varieties, changes and intensification of land use, environmental pollution and possible climate change.