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Acidic Paper
Acidic paper is paper which was manufactured using acidic substances. Widely used since the mid-nineteenth century, its pages become yellow within years, extremely brittle over decades, and eventually unreadable in the library and archive collections intended to preserve them. This process has been called " slow fire". Causes of paper degradation In the mid-nineteenth century, a method of paper production became popular in which resin-alum glue was added to the paper pulp, and the aluminum sulphate remaining in the paper, in reaction with water, forms acids. The long chains of plant cellulose, the structural material of paper, naturally decompose upon exposure to air, but this process is greatly accelerated by acids, which catalyze the decomposition (acidic hydrolysis). As the cellulose chains are cut apart, this reduces the tear resistance of the paper, and at the same time increases their cross-linking, making the paper stiff and brittle. Parallel to the degradation under th ... [...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, Textile, rags, poaceae, grasses, Feces#Other uses, herbivore dung, or other vegetable sources in water. Once the water is drained through a fine mesh leaving the fibre evenly distributed on the surface, it can be pressed and dried. The papermaking process developed in east Asia, probably China, at least as early as 105 Common Era, CE, by the Han Dynasty, Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BCE in China. Although paper was originally made in single sheets by hand, today it is mass-produced on large machines—some making reels 10 metres wide, running at 2,000 metres per minute and up to 600,000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 Housekeeping, cleaning. It may also be used a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jagiellonian Library
The Jagiellonian Library (, 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 the Autograph of Nicolaus Copernicus' De revolutionibus, autograph of Copernicus' ''De revolutionibus orbium coelestium, De Revolutionibus'' and Jan Długosz's ''Banderia Prutenorum'', and a large collection of Counterculture, underground literature (so-called ''drugi obieg'' or samizdat) from the pe ... [...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 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 preserving documents and 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. When exposed to light and/or heat, the molecules in the acidic paper will break down faster. Acidic wood-pulp paper became commonplace in the late 19th century, and in the 1930s. 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 been taken to improve the quality of paper. During production, acid-free paper may be treated with a mild base (usually calcium or m ... [...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 in London, and the 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 which put less emphasis on the repository character. National libraries are usual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perfluoroheptane
Perfluoroheptane, C7F16, (usually referring to the straight chain molecule called ''n''-perfluoroheptane) is a perfluorocarbon. 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 (MgO), 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 (MgO), 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 nigra'', 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 mod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digitization
Digitization is the process of converting information into a 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 (usually an analog signal) obtained by generating a series of numbers that describe a discrete set of points or samples. The result is called ''digital 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 numbers, which facilitates processing by digital computers and other operations, but digitizing simply means "the conversion of analog source material into a numerical format"; the decimal or any other number system can be used instead. Digitization is of crucial importance to data processing, storage, and transmission, bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tadeusz Kościuszko University Of Technology
''Tadeusz'' is a Polish first name, derived from Thaddaeus. Tadeusz may refer to: * Tadeusz Bednarowicz (1906–1939), Polish footballer * Tadeusz Bór-Komorowski (1895–1966), Polish military leader * Tadeusz Borowski (1922–1951), Polish writer and The Holocaust survivor * Tadeusz Boy-Żeleński (1874–1941), Polish gynaecologist, writer, poet, art critic, translator of French literary classics and journalist * Tadeusz Brzeziński (1896–1991), Polish consular official and the father of President Jimmy Carter's national security adviser, Zbigniew Brzezinski * Tadeusz Czeżowski (1889–1981), Polish philosopher and logician * Tadeusz Dołęga-Mostowicz (1898–1939), Polish journalist and author of over a dozen popular novels * Tadeusz Drzazga (born 1975), Polish weightlifter * Tadeusz Fijas (born 1960), Polish ski jumper * Tadeusz Hollender (1910–1943), Polish poet, translator and humorist * Tadeusz Rozwadowski (1866–1928), Polish military commander, diplomat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AGH University Of Science And Technology
AGH University of Krakow, (abbreviated as ''AGH University''; formerly: AGH University of Science and Technology or ''AGH UST'') is a public university in Kraków, Poland. Founded in 1913, its inauguration took place in 1919. The university focuses on innovative technologies, its research profile also includes engineering disciplines, exact sciences, Earth sciences, and social sciences. The university is one of 10 Polish higher education institutions that has been granted the title of a research university. The university comprises, among other units, 17 faculties, a research centre – the AGH University 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 almost 19,000 students and employs more than 2,200 academic staff (including more than 240 professors and more than 500 associate professors). The AGH Unive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adam Mickiewicz University In Poznań
The Adam Mickiewicz University (; Latin: ''Universitas Studiorum Mickiewicziana Posnaniensis'') is a research university in Poznań, Poland. Due to its history, the university is traditionally considered among Poland's most reputable institutions of higher learning, this standing equally being reflected in national rankings. It traces its origins to 1611, when under the Royal charter, Royal Charter granted by King Sigismund III Vasa, the Jesuit College in Poznań, Jesuit College became the first university in Poznań. The Poznań Society of Friends of Learning, 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 Positivism in Poland, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid Paper Damage
An acid is a molecule or ion capable of either donating a proton (i.e. hydrogen cation, H+), known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. The first category of acids are the proton donors, or Brønsted–Lowry acids. In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Arrhenius acids. Brønsted and Lowry generalized the Arrhenius theory to include non-aqueous solvents. A Brønsted–Lowry or Arrhenius acid usually contains a hydrogen atom bonded to a chemical structure that is still energetically favorable after loss of H+. Aqueous Arrhenius acids have characteristic properties that provide a practical description of an acid. Acids form aqueous solutions with a sour taste, can turn blue litmus red, and react with bases and certain metals (like calcium) to form salts. The word ''acid'' is derived from the Latin , meaning 'sour'. An aqueous solution of an acid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid
An acid is a molecule or ion capable of either donating a proton (i.e. Hydron, hydrogen cation, H+), known as a Brønsted–Lowry acid–base theory, Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. The first category of acids are the proton donors, or Brønsted–Lowry acid–base theory, Brønsted–Lowry acids. In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Acid–base reaction#Arrhenius theory, Arrhenius acids. Johannes Nicolaus Brønsted, Brønsted and Martin Lowry, Lowry generalized the Arrhenius theory to include non-aqueous solvents. A Brønsted–Lowry or Arrhenius acid usually contains a hydrogen atom bonded to a chemical structure that is still energetically favorable after loss of H+. Aqueous Arrhenius acids have characteristic properties that provide a practical description of an acid. Acids form aqueous solutions with a sour taste, can turn blue litmus red, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
