Accedi

Bibliografie tematiche / Abstract

Letteratura scientifica selezionata sul tema "Abstract"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 marzo 2023

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Indice

Articoli di riviste
Tesi
Libri
Capitoli di libri
Atti di convegni
Rapporti di organizzazioni

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Abstract".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Abstract"

1

Surname, Bob. "depositing @ abstracts". Journal of CrossRef Test Deposits 1, n. 1 (2000): 72. http://dx.doi.org/10.5555/abstract.

Testo completo

Abstract (sommario):

Background Insecticide-impregnated bed nets and curtains (ITN) have been shown by many studies to be effective against malaria. However, in areas of intense malaria transmission and due to possible interactions with immunity development ITN interventions may cause no effect at all or even an increase in malaria morbidity and mortality.

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Rothstein, Jules M. "Making Abstracts Less Abstract". Physical Therapy 72, n. 11 (1 novembre 1992): 762. http://dx.doi.org/10.1093/ptj/72.11.762.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Krausman, Paul R., Allison S. Cox e Anna C. S. Knipps. "Abstract abstracts and other abstractions". Journal of Wildlife Management 80, n. 6 (4 giugno 2016): 955–56. http://dx.doi.org/10.1002/jwmg.21099.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Schwabik, Štefan. "Abstract Perron-Stieltjes integral". Mathematica Bohemica 121, n. 4 (1996): 425–47. http://dx.doi.org/10.21136/mb.1996.126036.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Rees, Mandy. "Abstract Selected Thesis and Dissertation Abstracts". Voice and Speech Review 1, n. 1 (gennaio 2000): 328–31. http://dx.doi.org/10.1080/23268263.2000.10761435.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Pták, Vlastimil, e Pavla Vrbová. "An abstract model for compressions". Časopis pro pěstování matematiky 113, n. 3 (1988): 252–66. http://dx.doi.org/10.21136/cpm.1988.108785.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

KOLLÁR, Ján, Milan SPIŠIAK e Michal SIČÁK. "ABSTRACT LANGUAGE OF THE MACHINE MIND". Acta Electrotechnica et Informatica 15, n. 3 (1 settembre 2015): 24–31. http://dx.doi.org/10.15546/aeei-2015-0025.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Mikulinsky, Romi, e Yanai Toister. "From Abstract Art to Abstracted Artists". Journal of Science and Technology of the Arts 8, n. 1 (30 novembre 2016): 29. http://dx.doi.org/10.7559/citarj.v8i1.219.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Struth, Georg. "Abstract abstract reduction". Journal of Logic and Algebraic Programming 66, n. 2 (febbraio 2006): 239–70. http://dx.doi.org/10.1016/j.jlap.2005.04.001.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Johnson, J. Ian, Nicholas Labich, Matthew Might e David Van Horn. "Optimizing abstract abstract machines". ACM SIGPLAN Notices 48, n. 9 (12 novembre 2013): 443–54. http://dx.doi.org/10.1145/2544174.2500604.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "Abstract"

1

Frisk, Anders. "On the structure of standardly stratified algebras /". Uppsala, 2004. http://www.math.uu.se/research/pub/Frisk5lic.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Teichmann, Roger. "Abstract entities". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315954.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Kappers, Michael. "VIRTUALLY ABSTRACT". Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4011.

Testo completo

Abstract (sommario):

My most recent body of work frees me from traditional animation and graphic design principles that had become second nature in my creative practice over years of commercial work in industry. I now find myself unconsciously creating shape and form without a preconceived vision of the final outcome. This allows for a free-flowing approach to my canvas. The canvas in which my forms are created is virtual space and can be described as an infinite cube. The first step I take in each of my pieces is creating a cube with the center residing at Cartesian coordinates 0,0,0. From there, I make the decision either to subdivide the cube into sections or extrude faces from the cube. In either case, I begin to see the possibilities in which the form can take. Some forms are organic and rhythmic while others become machined and rigid. At this stage, color and light are not a part of the equation.
M.F.A.
Department of Art
Arts and Humanities
Studio Art and the Computer MFA

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Haller, Leopold Carl Robert. "Abstract satisfaction". Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:68f76f3a-485b-4c98-8d02-5e8d6b844b4e.

Testo completo

Abstract (sommario):

This dissertation shows that satisfiability procedures are abstract interpreters. This insight provides a unified view of program analysis and satisfiability solving and enables technology transfer between the two fields. The framework underlying these developments provides systematic recipes that show how intuition from satisfiability solvers can be lifted to program analyzers, how approximation techniques from program analyzers can be integrated into satisfiability procedures and how program analyzers and satisfiability solvers can be combined. Based on this work, we have developed new tools for checking program correctness and for solving satisfiability of quantifier-free first-order formulas. These tools outperform existing approaches. We introduce abstract satisfaction, an algebraic framework for applying abstract interpre- tation to obtain sound, but potentially incomplete satisfiability procedures. The framework allows the operation of satisfiability procedures to be understood in terms of fixed point computations involving deduction and abduction transformers on lattices. It also enables satisfiability solving and program correctness to be viewed as the same algebraic problem. Using abstract satisfaction, we show that a number of satisfiability procedures can be understood as abstract interpreters, including Boolean constraint propagation, the dpll and cdcl algorithms, St ̊almarck’s procedure, the dpll(t) framework and solvers based on congruence closure and the Bellman-Ford algorithm. Our work leads to a novel understand- ing of satisfiability architectures as refinement procedures for abstract analyses and allows us to relate these procedures to independent developments in program analysis. We use this perspective to develop Abstract Conflict-Driven Clause Learning (acdcl), a rigorous, lattice-based generalization of cdcl, the central algorithm of modern satisfiability research. The acdcl framework provides a solution to the open problem of lifting cdcl to new prob- lem domains and can be instantiated over many lattices that occur in practice. We provide soundness and completeness arguments for acdcl that apply to all such instantiations. We evaluate the effectiveness of acdcl by investigating two practical instantiations: fp-acdcl, a satisfiability procedure for the first-order theory of floating point arithmetic, and cdfpl, an interval-based program analyzer that uses cdcl-style learning to improve the precision of a program analysis. fp-acdcl is faster than competing approaches in 80% of our benchmarks and it is faster by more than an order of magnitude in 60% of the benchmarks. Out of 33 safe programs, cdfpl proves 16 more programs correct than a mature interval analysis tool and can conclusively determine the presence of errors in 24 unsafe benchmarks. Compared to bounded model checking, cdfpl is on average at least 260 times faster on our benchmark set.

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Mofleh, Amer Ibrahim. "Abstract payment undertakings : to what extent are they truly abstract?" Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/31087.

Testo completo

Abstract (sommario):

This work examines to what extent documentary credits and demand guarantees are, and should, be treated as autonomous or abstract from the underlying contract that leads to their issuance. This question is of vital importance to the commercial parties that utilise these instruments. The answer to it determines many of their duties, liabilities, the risks they undertake and the remedies available to them. While documentary credits and demand guarantees share some characteristics, both instruments serve different commercial functions. As such, the legal principles governing each instrument should be tailored to fit its functions. This point and the relevant legal and commercial issues relating to it will be examined thoroughly in Chapters 1 and 2. Chapters 3 and 4 will critically analyse the different approaches developed by the English courts when dealing with the autonomy of these instruments. It will be demonstrated that the rules they have developed in this area of law are inconsistent, in some instances contradictory, commercially unsound and do not reflect the traders' perceptions of the instruments. This unsatisfactory outcome has resulted from the English courts' (i) failure to distinguish between documentary credits and demand guarantees; (ii) insistence on applying to these instruments particular doctrines which developed outside their context; and (iii) failure to develop any clear framework by which they can abide when dealing with the issue of autonomy. Chapter 5 examines the autonomy principle in demand guarantees and documentary credits where third parties are involved. Finally, Chapter 6 examinees to what extent a documentary credit and a demand guarantee may be affected by illegality in the underlying transaction. In addition, it will analyse whether banks issuing such instruments are entitled to exercise a right of set-off by against the beneficiary of these instruments.

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Wong, Hong-Yee. "Abstract scene specifications". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21323.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Schneider, Kevin A. "Abstract user interfaces". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ56099.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Desharnais, Jules. "Abstract relational semantics". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75986.

Testo completo

Abstract (sommario):

Abstract relational algebra is used to define the semantics of a simple imperative language. In order to carry out this task, various domains are specified by relational axioms. Some specifications define relations on the basic types of the language (Booleans and natural numbers); their presentation stresses the importance of the concept of point. Other specifications construct the relational domains whose relations are used to denote programs. The programming constructs that are defined include expressions, variable declarations, assignment statements, while-program statements and procedures. A particularity of the semantic definitions is that the relations denoting a program fragment depend only on the fragment, and not on its environment (procedure calls excepted). Finally, it is shown how the semantics of a program fragment can be used to prove its correctness relative to a specification. The result is a uniform abstract relational setting for specification, semantics and program derivation.

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Mathiesen, Erik Arne. "Abstract hoare logic". Thesis, Queen Mary, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497518.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Ahmed, Amna Mohamed Abdelgader. "Abstract topological dynamics". Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3503/.

Testo completo

Abstract (sommario):

Let \(\char{cmmi10}{0x54}\) : \(\char{cmmi10}{0x58}\) → \(\char{cmmi10}{0x58}\) be a function from a countably infinite set \(\char{cmmi10}{0x58}\) to itself. We consider the following problem: can we put a structure on \(\char{cmmi10}{0x58}\) with respect to which \(\char{cmmi10}{0x54}\) has some meaning? In this thesis, the following questions are addressed: when can we endow \(\char{cmmi10}{0x58}\) with a topology such that \(\char{cmmi10}{0x58}\) is homeomorphic to the rationals \(\char{msbm10}{0x51}\) and with respect to which \(\char{cmmi10}{0x54}\) is continuous? We characterize such functions on the rational world. The other question is: can we put an order on \(\char{cmmi10}{0x58}\) with respect to which \(\char{cmmi10}{0x58}\) is order-isomorphic to the rationals \(\char{msbm10}{0x51}\), naturals \(\char{msbm10}{0x4e}\) or integers \(\char{msbm10}{0x5a}\) with their usual orders and with respect to which \(\char{cmmi10}{0x54}\) is order-preserving (or order-reversing)? We give characterization of such bijections, injections and surjections on the rational world and of arbitrary maps on the naturals and integers in terms of the orbit structure of the map concerned.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "Abstract"

1

Kärnten, Museum Moderner Kunst, a cura di. Abstrakt: Abstract. Kärnten: MMKK, Museum Moderner Kunst Kärnten, 2008.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Dummit, David Steven. Abstract algebra. 2^a ed. Upper Saddle River, N.J: Prentice Hall, 1999.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Dummit, David Steven. Abstract algebra. Englewood Cliffs, N.J: Prentice Hall, 1991.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

1950-, Foote Richard M., a cura di. Abstract algebra. 3^a ed. Hoboken, NJ: Wiley, 2004.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Garitte, André. Un siecle d'art abstrait: 100 abstraits belges = Een eeuw abstracte kunst : 100 Belgische abstracten. Bruxelles: René Magritte Museum, 2010.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Garitte, André. Un siecle d'art abstrait: 100 abstraits belges = Een eeuw abstracte kunst : 100 Belgische abstracten. Bruxelles: René Magritte Museum, 2010.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Tirth, Das, Dave R. K, Ojha Dinesh Chandra 1948- e ENVIS Centre on Desertification, a cura di. Den abstracts: Desert environment abstract. Jodhpur: ENVIS Centre on Desertification, 2002.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Herstein, I. N. Abstract algebra. 2^a ed. New York: Macmillan Pub., 1990.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Herstein, I. N. Abstract algebra. New York: Macmillan, 1986.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Abstract algebra. 3^a ed. Upper Saddle River, N.J: Wiley, 1999.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Capitoli di libri sul tema "Abstract"

1

Musch, Olaf. "Abstrakte Fabrik (Abstract Factory)". In Design Patterns mit Java, 191–212. Wiesbaden: Springer Fachmedien Wiesbaden, 2021. http://dx.doi.org/10.1007/978-3-658-35492-3_15.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Musch, Olaf. "Abstract Factory (Abstract Factory)". In Design Patterns with Java, 183–203. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-39829-3_15.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Rapp, Heinz-Werner, e Alfons Cortés. "Abstract". In Cognitive Finance, 1–3. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-18643-2_1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Olsson, Mikael. "Abstract". In PHP 7 Quick Scripting Reference, 65–67. Berkeley, CA: Apress, 2016. http://dx.doi.org/10.1007/978-1-4842-1922-5_15.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Feltrin, Glauco. "Abstract". In Absorbing Boundaries for the Time-Domain Analysis of Dam-Reservoir-Foundation Systems, 251–52. Basel: Birkhäuser Basel, 1997. http://dx.doi.org/10.1007/978-3-0348-7610-0_12.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Gätje, Christiane, e Karsten Reise. "Abstract". In Ökosystem Wattenmeer/The Wadden Sea Ecosystem, 9–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-58751-1_2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Hillmer, Ute. "Abstract". In Technology Acceptance in Mechatronics, 1–2. Wiesbaden: Gabler, 2009. http://dx.doi.org/10.1007/978-3-8349-8375-6_1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Kuné, Jan B. "Abstract". In Contributions to Economics, 103–4. Heidelberg: Physica-Verlag HD, 2003. http://dx.doi.org/10.1007/978-3-642-50170-8_8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Olsson, Mikael. "Abstract". In C# 8 Quick Syntax Reference, 109–12. Berkeley, CA: Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-5577-3_18.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Pabisch, Roland. "Abstract". In Derivation of the time dilatation effect from fundamental properties of photons, 1–3. Vienna: Springer Vienna, 1999. http://dx.doi.org/10.1007/978-3-7091-9483-6_1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Abstract"

1

"Papers abstract [13 abstracts]". In 2019 Artificial Intelligence for Transforming Business and Society (AITB). IEEE, 2019. http://dx.doi.org/10.1109/aitb48515.2019.8947441.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

"[Various abstract-only presentations - 9 abstracts]". In 2015 IEEE Twelfth International Symposium on Autonomous Decentralized System (ISADS). IEEE, 2015. http://dx.doi.org/10.1109/isads.2015.61.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Dhillon, Inderjit S. "Abstract of the Keynotes [7 abstracts]". In 2019 Twelfth International Conference on Contemporary Computing (IC3). IEEE, 2019. http://dx.doi.org/10.1109/ic3.2019.8844903.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Johnson, J. Ian, Nicholas Labich, Matthew Might e David Van Horn. "Optimizing abstract abstract machines". In ICFP'13: ACM SIGPLAN International Conference on Functional Programming. New York, NY, USA: ACM, 2013. http://dx.doi.org/10.1145/2500365.2500604.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Acharya, Swati, Kira Y. D. Petersen, Vladislav Golubkov, Mandy Kwong, Christopher M. Adams, Peter K. Jackson e David B. Lewis. "Abstract 5002: Abstract Submission". In Proceedings: AACR 106th Annual Meeting 2015; April 18-22, 2015; Philadelphia, PA. American Association for Cancer Research, 2015. http://dx.doi.org/10.1158/1538-7445.am2015-5002.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Watson, Yasmeem. "Abstract A41: [Advocate Abstract:] Thriving". In Abstracts: Ninth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; September 25-28, 2016; Fort Lauderdale, FL. American Association for Cancer Research, 2017. http://dx.doi.org/10.1158/1538-7755.disp16-a41.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Goodman, Dou, Xin Hao, Yang Wang, Jiawei Tang, Yunhan Jia, pPei Wang e Tao Wei. "ABSTRACT". In the 2019 ACM SIGSAC Conference. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3338466.3358928.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Michalas, Antonis, Alexandros Bakas, Hai-Van Dang e Alexandr Zalitko. "ABSTRACT". In the 2019 ACM SIGSAC Conference. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3338466.3358929.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

"Abstract". In 23rd IEEE VLSI Test Symposium (VTS'05). IEEE, 2005. http://dx.doi.org/10.1109/vts.2005.12.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

"Abstract". In 23rd IEEE VLSI Test Symposium (VTS'05). IEEE, 2005. http://dx.doi.org/10.1109/vts.2005.18.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "Abstract"

1

Pike, Christopher. General Abstract. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213128.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Miranda, Andre. General Audience Abstract. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213134.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Gibson, Alexander. General Audience Abstract. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213165.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Indivero, Lucas, e Charles J. Mueller. Oral Presentation Abstract. Office of Scientific and Technical Information (OSTI), luglio 2018. http://dx.doi.org/10.2172/1530145.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

McGraw, Robert, Joseph Clark e Allyn Treshansky. Abstract Modeling Demonstration. Fort Belvoir, VA: Defense Technical Information Center, luglio 2001. http://dx.doi.org/10.21236/ada389052.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Janakiraman, Muralidharan. Abstract Index Interfaces. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.7161.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Aadithya, Karthik, Eric Keiter e Ting Mei. Abstract Algebra Basics. Office of Scientific and Technical Information (OSTI), marzo 2019. http://dx.doi.org/10.2172/1761970.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Ziesler, Pamela, e Claire Spalding. Statistical abstract: 2021. National Park Service, maggio 2022. http://dx.doi.org/10.36967/nrds-2293345.

Testo completo

Abstract (sommario):

In 2021, recreation visits to National Park Service (NPS) sites rebounded from the COVID-19 pandemic-driven low visitation of 2020 and climbed to 297,115,406 recreation visits. This is an increase of 60 million recreation visits (+25.3%) from 2020 and a decrease of 30 million recreation visits (-9.3%) from 2019. Recreation visitor hours were 1,356,657,749 – a 28.6% increase from 2020 and a 5.1% decrease from 2019. Total overnight stays followed a similar pattern with 12,745,455 overnight stays – up 4.7 million (+58.5%) from 2020 and down 1.1 million (-8%) from 2019. Five parks were added to the reporting system in 2021: Alagnak Wild River in Alaska, Camp Nelson National Monument in Kentucky, Medgar and Myrlie Evers Home National Monument in Mississippi, Tule Springs Fossil Beds National Monument in Nevada, and World War I Memorial in Washington, D.C. These parks were responsible for over 629,000 recreation visits in 2021. Factors influencing visits to National Park System units in 2021 include: continuing closures and limited capacities due to COVID-19 mitigation at some parks, temporary closures for wildland fires in 2021 (eleven parks), severe regional smoke/haze from ongoing wildland fires throughout the summer and early autumn affecting parks in the western half and northern tier of states in the continental U.S., two hurricanes in 2021 – both in August – impacted visitation: Hurricane Henri caused temporary closures of some parks in the northeast and Hurricane Ida caused temporary closures of parks along the Gulf Coast and generated some heavy flooding in the northeast, hurricanes and wildland fires in previous years resulting in lingering closures, most notably Hurricanes Irma and Maria in 2017, the Carr and Woolsey Fires in 2018, Hurricane Dorian in 2019, the Caldwell, Cameron Peak, East Troublesome, and Woodward Fires in 2020, and Hurricane Sally in 2020. Forty-four parks set a record for recreation visits in 2021 and 6 parks broke a record they set in 2020. See Appendix A for a list of record parks. The number of reporting units with over 10 million recreation visits was the same as in recent years (3 parks) and 73 parks had over 1 million recreation visits. Twenty-five percent of total recreation visits occurred in the top 8 parks and fifty percent of total visitation occurred in the top 25 parks. Several parks passed annual visitation milestones including Capulin Volcano NM which passed 100,000 annual recreation visits for the first time, Big Bend NP and Devils Tower NM which each passed 500,000 annual recreation visits for the first time, and Zion NP which passed 5 million visits for the first time. Other parks passed milestones for accumulated recreation visits including Hamilton Grange NMEM (1968-2021) and Palo Alto Battlefield NHP (2003-2021) each passing 1 million total recreation visits, Voyageurs NP (1976-2021) passing 10 million total recreation visits, and Hot Springs NP (1904-2021) passing 100 million total recreation visits. Population center designations were updated in 2021 to reflect overlap of park boundaries with statistical areas from the 2020 U.S. Census. Many population center changes reflect increases in local population as indicated by parks changing from rural to outlying or from outlying to suburban. Other changes reflect increasing complexity in population density as parks changed from a single designation, such as rural or suburban, to a mixed designation. See the Definitions section for population center definitions and Table B.1 for previous and updated population center designations by park. In the pages that follow, a series of tables and figures display visitor use data for calendar year 2021. By documenting these visits across the National Park System, the NPS Statistical Abstract offers a historical record of visitor use in parks and provides NPS staff and partners with a useful tool for effective management and planning. In 2021, 394 of 423 NPS units...

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Ranade, Abhiram G., Sandeep N. Bhatt e S. L. Johnsson. The Fluent Abstract Machine. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1987. http://dx.doi.org/10.21236/ada327476.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Cunningham, Diane. Abstract and index collection. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nbs.sp.751.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!