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Acidic Paper
Acidic paper is paper that had some acidic substances used during the manufacture process. This type of paper, widely used since the mid-nineteenth century, turns yellow in a short time and becomes extremely brittle, which causes huge losses in library and archives collections. Causes of paper degradation Paper degradation is a slow process, but it is significantly accelerated in an acidic environment. In the mid-nineteenth century, the method of paper production became popular, in which resin-alum glue was added to the paper pulp. The aluminum sulphate remaining in the paper form, in reaction with water, acids that catalyze the decomposition of cellulose (acidic hydrolysis). In this process, the cellulose chains are shortened, which reduces the tear resistance of the paper, and at the same time increases the cross-linking of their structure that causes the paper to stiffen and become brittle. Parallel to the degradation under the influence of water, the cellulose chains react ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paper
Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Although paper was originally made in single sheets by hand, almost all is now made on large machines—some making reels 10 metres wide, running at 2,000 metres per minute and up to 600,000 tonnes a year. It is a versatile material with many uses, including printing, painting, graphics, signage, design, packaging, decorating, writing, and cleaning. It may also be used as filter paper, wallpaper, book endpaper, conservation paper, laminated worktops, toilet tissue, or currency and security paper, or in a number of industrial and construction processes. The papermaking process developed in east Asia, probably China, at least as early as 105 CE, by the Han court eunuch Cai Lun, although the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jagiellonian Library
Jagiellonian Library ( pl, Biblioteka Jagiellońska, popular nickname ''Jagiellonka'') is the library of the Jagiellonian University in Kraków and with almost 6.7 million volumes, one of the largest libraries in Poland, serving as a public library, university library and part of the Polish national library system.Official national library of Poland is the National Library of Poland in Warsaw; however Jagiellonian Library is considered a part of the '' Narodowy Zasób Biblioteczny''. It was ''the'' National Library before the creation of the National Library in Warsaw, and today it contains the National Library collection for the period before 1801. It has a large collection of medieval manuscripts, for example Copernicus' ''De Revolutionibus'' and Jan Długosz's ''Banderia Prutenorum'', and a large collection of underground literature (so-called ''drugi obieg'' or samizdat) from the period of communist rule in Poland (1945–1989). The Jagiellonian also houses the '' Berlinka'' a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid-free Paper
Acid-free paper is paper that, if infused in water, yields a neutral or basic (chemistry), basic pH (7 or slightly greater). It can be made from any cellulose fiber as long as the active acid pulp is eliminated during processing. It is also lignin- and sulfur-free. Acid-free paper addresses the problem of Preservation (library and archival science), preserving documents and Conservation (cultural heritage), preserving artwork for long periods. Overview Paper made from wood-based pulp that has not had its lignin removed turns yellow, becomes brittle, and deteriorates over time. When exposed to light and/or heat, the molecules in the acidic paper will break down even faster. Acidic wood-pulp paper became commonplace in the late 19th century, and in the 1930s William Barrow (chemist), William Barrow (a chemist and librarian) published a report about the deterioration of acidic paper in the libraries. For fear of the gradual disintegration of written materials, measures have since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Library
A national library is a library established by a government as a country's preeminent repository of information. Unlike public library, public libraries, these rarely allow citizens to borrow books. Often, they include numerous rare, valuable, or significant works. A national library is that library which has the duty of collecting and preserving the literature of the nation within and outside the country. Thus, national libraries are those libraries whose community is the nation at large. Examples include the British Library, and the Bibliothèque nationale de France in Paris.Line, Maurice B.; Line, J. (2011). "Concluding notes". ''National libraries'', Aslib, pp. 317–318Lor, P. J.; Sonnekus, E. A. S. (2010)"Guidelines for Legislation for National Library Services", International Federation of Library Associations and Institutions, IFLA. Retrieved on 10 January 2010. There are wider definitions of a national library, putting less emphasis to the repository character. National ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perfluoroheptane
Perfluoroheptane, C7F16, (usually referring to the straight chain molecule called ''n''-perfluoroheptane) is a per fluorocarbon. It is hydrophobic (water-insoluble) and oleophobic (oil-insoluble). It is used in deacidification of paper as a medium carrying powdered magnesium oxide Magnesium oxide ( Mg O), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions .... References Perfluoroalkanes {{Organohalide-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesium Oxide
Magnesium oxide ( Mg O), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to remove moisture. Magnesium oxide was historically known as magnesia alba (literally, the white mineral from Magnesia), to differentiate it from ''magnesia negra'', a black mineral containing what is now known as manganese. Related oxides While "magnesium oxide" normally refers to MgO, the compound magnesium peroxide MgO2 is also known. According to evolutionary crystal structure prediction, MgO2 is thermodynamically stable at pressures above 116 GPa (gigapascals), and a semiconducting suboxide Mg3O2 is thermodynamically stable above 500 GPa. Because of its stability, MgO is used as a model sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digitization
DigitizationTech Target. (2011, April). Definition: digitization. ''WhatIs.com''. Retrieved December 15, 2021, from https://whatis.techtarget.com/definition/digitization is the process of converting information into a Digital data, digital (i.e. computer-readable) format.Collins Dictionary. (n.d.). Definition of 'digitize'. Retrieved December 15, 2021, from https://www.collinsdictionary.com/dictionary/english/digitize The result is the representation of an object, image, sound, document, or Signal (electrical engineering), signal (usually an analog signal) obtained by generating a series of numbers that describe a discrete set of points or Sample (signal), samples. The result is called ''Digital data, digital Group representation, representation'' or, more specifically, a ''digital image'', for the object, and ''digital form'', for the signal. In modern practice, the digitized data is in the form of Binary number, binary numbers, which facilitates processing by Digital computer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tadeusz Kościuszko University Of Technology
Cracow University of Technology ( pl, Politechnika Krakowska im. Tadeusza Kościuszki) is a public university located in central Kraków, Poland, established in 1946 and, as an institution of higher learning granted full autonomy in 1954. Over 37,000 students graduated from the university to this day with degrees. Doctorate degrees were granted to 1200 persons and Habilitated degrees – to additional 300. The number of students admitted each year reaches 4500. Organizational structure *Faculty of Architecture, *Faculty of Electrical and Computer Engineering *Faculty of Civil Engineering *Faculty of Environmental Engineering *Faculty of Chemical Engineering and Technology *Faculty of Mechanical Engineering *Faculty of Physics, Mathematics and Computer Science Ranking In a survey conducted by the Polish edition of Newsweek in 2008, Cracow University of Technology was selected as the best university in Poland. Another magazine, ''Wprost'', ranked it 8th in 2015. In 2017 ''Persp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AGH University Of Science And Technology
AGH University of Science and Technology in Kraków, (abbreviated as ''AGH UST'') is a public university in Kraków, Poland. Founded in 1913, its inauguration took place in 1919. The university focuses on innovation, innovative technologies, its research profile also includes engineering, engineering disciplines, exact sciences, Earth sciences, and social sciences. The university is one of 10 List of universities in Poland, Polish higher education institutions that has been granted the title of a research university. The university comprises, among other units, 16 faculties, a research centre – the AGH UST Academic Centre for Materials and Nanotechnology, and other didactic centres and departments. It offers three levels of education: first-cycle, second-cycle, and third-cycle (doctoral schools). The university educates more than 20,000 students and employs almost 2,000 academic staff (including more than 200 professors and more than 500 associate professors). In international ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adam Mickiewicz University In Poznań
The Adam Mickiewicz University ( pl, Uniwersytet im. Adama Mickiewicza w Poznaniu; Latin: ''Universitas Studiorum Mickiewicziana Posnaniensis'') is a research university in Poznań, Poland. It traces its origins to 1611, when under the Royal Charter granted by King Sigismund III Vasa, the Jesuit College became the first university in Poznań. The Poznań Society for the Advancement of Arts and Sciences which played an important role in leading Poznań to its reputation as a chief intellectual centre during the Age of Positivism and partitions of Poland, initiated founding of the university. The inauguration ceremony of the newly founded institution took place on 7 May 1919 that is 308 years after it was formally established by the Polish king and on 400th anniversary of the foundation of the Lubrański Academy which is considered its predecessor. Its original name was Piast University (Polish: ''Wszechnica Piastowska''), which later in 1920 was renamed to University of PoznaŠ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid Paper Damage
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequence of database operations that satisfies the ACID properties (which can be perceived as a single logical operation on the data) is called a ''transaction''. For example, a transfer of funds from one bank account to another, even involving multiple changes such as debiting one account and crediting another, is a single transaction. In 1983, Andreas Reuter and Theo Härder coined the acronym ''ACID'', building on earlier work by Jim Gray who named atomicity, consistency, and durability, but not isolation, when characterizing the transaction concept. These four properties are the major guarantees of the transaction paradigm, which has influenced many aspects of development in database systems. According to Gray and Reuter, the IBM Informa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequence of database operations that satisfies the ACID properties (which can be perceived as a single logical operation on the data) is called a ''transaction''. For example, a transfer of funds from one bank account to another, even involving multiple changes such as debiting one account and crediting another, is a single transaction. In 1983, Andreas Reuter and Theo Härder coined the acronym ''ACID'', building on earlier work by Jim Gray who named atomicity, consistency, and durability, but not isolation, when characterizing the transaction concept. These four properties are the major guarantees of the transaction paradigm, which has influenced many aspects of development in database systems. According to Gray and Reuter, the IBM Informa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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