Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège

Glossary

Vous trouverez dans ce glossaire les définitions de termes présents dans les différents articles, classés de manière alphabétique.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
V
Valade, Léon

A French poet, born in 1841 and died in 1884. He frequented several Parisian circles such as the Vilains-Bonshommes and the ‘Zutic’ circle.

van Allen, Belts of

The Van Allen belts are radiation belts which surround the Earth. They carry the name of the American physicist James Alfred Van Allen (who died in 2006), to whom their discovery is owed. Van Allen dreamed up the scientific programme of the first American satellite, Explorer 1, launched in February 1958. It was the instruments on board that allowed for the discovery that the Earth is surrounded by a belt of radiation. This discovery is considered as the first major scientific discovery of the space age, the data supplied by Sputnik-1 being more of an anecdotal nature.

The Van Allen belts are of two types. The first (between an altitude of 700 and 1000km) is composed of protons emanating from the solar wind and captured by the Earth’s magnetic field.

The second (between an altitude of 13,000 and 65,000km) is composed of electrons.

Van Allen Ceinture EN

van der Keuken Johan

Johan van der Keuken, born on the 4th April, 1938, in Amsterdam, and who died on 7th January, 2001, in the same city, is a Dutch filmmaker and photographer. Passionate about the image and the Real, his cinema is situated on the border of the documentary and the experimental.

Variationism

A part of linguistics which shows that language is not a monolithic block, but a sum of hierarchised varieties which the speaker and a given community mobilize differently according to social and instrumental contexts.

Vasari, Giorgio

Born in 1511, died 1547. This Italian writer, painter and architect authored an anthology of biographies, Lives of the Most Excellent Painters, Sculptors and Architects (often referred to simply as Vasari’s Lives), which is a cornerstone of modern art history. 

Vector approach

Within this approach individual geographical objects are situated by fixed points in geographical co-ordinates, and which are capable of grouped in lines or polygons. On a geographical map these geometries could represent roads, buildings or criminal acts. For example it is to be differentiated from the matrix approach (or image or raster), where the spatial unit is the pixel, corresponding to a small regular surface area on the ground.

La vélocimétrie est la mesure de la vitesse d’un liquide.

Velocimetry is the measurement of the velocity of fluids.

Venice Charter

The international Charter on the conservation and restoration of monuments and sites, called the Venice Charter, is a treaty that provides an international framework for the preservation and restoration of historic buildings. It was approved by the Second International Congress of Architects and Technicians of Historic Monuments at their meeting in Venice, May 25-31, 1964.
Complete version of the Venice Charter

Verhaeren, Emile (1855-1916)

Verhaeren, Emile (1855-1916): a Belgian francophone poet, born in Saint-Amand (province of Antwerpd'Anvers) and who died in an accident in France, at the Rouen train station. Born into a prosperous background in which French was the language spoken, whereas Flemish was spoken by the working classes, he studied law at the University of Louvain. He then enrolled in the Brussels Bar and began work at the chambers of Edmond Picard, who introduced him to Belgian artistic and literary circles. He nevertheless quickly abandoned his law career, far preferring to write for L' Art moderne and La Jeune Belgique, which enabled him to support with his quill young artists such as James Ensor. His first collection of poems, Les Flamandes (1883), of naturalistic brushwork, presented a series of ‘paintings’ inspired by the region of his birth. But his poetry, marked by symbolism, soon acquired a dark and mournful tone (Les Flambeaux noirs, 1891), before being converted to modernism and the progress of humanity: this was the period when he rallied to the socialist cause and produced the masterpieces of musicality which are Les Campagnes hallucinées (1893), Les Villages illusoires (1895) and Les Villes tentaculaires (1895). His reputation spread thus to France and then to the whole of Europe. The Great War nevertheless brought into question his humanist values and his faith in a better future, a distress which can be clearly felt in his final work: Les Ailes rouges de la guerre (1916).

Verlaine, Paul (1844-1896)

A French poet who was born in Metz in 1844 and died in Paris in 1896. From the 1860s he frequented literary salons and the members of the Parnassian movement. He even worked on the first Parnasse contemporain. Married and a respected poet, his life would take another turn when he met a young poet, Arthur Rimbaud, with whom he had a homosexual relationship and experienced bohemian life, notably in London and Ostend. During an argument in Brussels, he shot at Arthur Rimbaud, injuring his wrist, and spent two years in prison before converting to Catholicism. It is also to him that we owe the notion of ‘cursed poets.’

Vernacular

Everyday or spoken language, specific to a given country or community.

Vernalisation

Process involving refrigeration that leads to subsequent flowering; by extension, this also refers to a plant’s becoming able to flower through exposure to cold. This process requires a fairly long period, (from several days to several months in length) of temperatures that are cold but during which there is no killing frost.

verotoxin

A toxin (τοξικον = poison) is a protein produced by a bacteria which acts upon our cells; as its name suggests, it is toxic. A verotoxin is a type of toxin produced by some kinds of E. coli. bacteria. The toxin attacks the intestinal system and causes diarrhea which can contain blood. In some cases, depending on their concentration or following the sensitivity of the infected individual, they can contaminate the blood and cause kidney failure, leading to the death of the infected persons if they are not treated in time.

Vertigo

A subsidiary of DC Comics created in 1993. It distinguished itself by producing series that were different from those produced by its parent company.

http://www.vertigocomics.com/

Vichy (Government)

After the debacle of the French troops in May-June 1940, Maréchal Pétain was named head of the Government on the 16th of June 1940. He asked for the conditions of the Armistice, which were then signed on the 22nd of June. On the 10th of July, by a vote in the two Chambers convened in a national assembly (569 yes, 80 no, 21 abstentions, 237 absent), he was elected Head of the French state. His Government, which was based in the town of Vichy, practised the politics of collaboration with Germany.

Vicious, Sid (1957-1979)

An unstable and violent character, and bassist in the punk group The Sex Pistols. He is today one of the main figures of this musical movement. He died of an overdose at the age of twenty-one.

Vilains-Bonshommes

A French poetry movement of the second half of the 19th century, close to the Parnassian movement. The name of the group comes from a theatre play by François Coppée, Le passant. A columnist in the Le Nain Jaune newspaper had criticised the young people in the audience who had acclaimed a little too enthusiastically the success of the play by terming them ‘vilains bonshommes’(naughty lads). The movement took the expression for its name.

viral load

The viral load translates the quantity of virus per milliliter of blood. The higher the viral load, the more the quicker the progression of the virus in the body. When a person has a viral load of more than 100,000 copies per milliliter of blood, the virus is considered as very active. It is also possible to have a viral load that is undetectable which signifies that the virus is very weakly present in the body to the point that laboratory equipment cannot detect it. But it is still present and so are risks of transmission.

viremia

Presence of the virus in the bloodstream.

Virtus or virtù

A Latin word drawn from vir (man in opposition to woman) and meaning ‘courage.’ The Machiavellian meaning of virtù, strictly political, makes a break and admits the recourse to evil, and clearly splits from the ancient and Medieval conceptions of the notion.

Virus

An infectious agent which multiplies within a cell. Viruses are therefore no longer considered as real living beings, like bacteria for instance, because they are not autonomous: to reproduce, they have to use the cells of living organisms by turning them to their advantage. When a virus enters a cell, the cell’s resources are mobilised to ensure the multiplication of the virus. The new viruses enter other cells in turn and so forth. This process - a viral infection - is often accompanied by the death of the host cell. These cellular deaths are at the source of the appearance of pathologies (flu, for instance) in infected organisms. Viruses are eliminated by the immune system of the infected organisms.

viscosupplementation

One of the treatments for osteoarthritis. It involves injection of hyaluronic acid into the joints affected by osteoarthritis in order to improve mobility and reduce pain. Its effects are short-term.

Visigoths

The name of the Western Goths who, confronted by the invasion of the Huns, took refuge in 376 in the Roman Empire. Under the leadership of their king, Alaric, they laid waste to Greece and Illyria, then Italy, where they seized Rome in 410. They then established themselves in South-East Gaul, with the agreement of the Roman authorities. Following his victory at Vouillé in 507, the Frankish king Clovis pushed them back beyond the Pyrenees. The Visigoth kingdom of Spain only disappeared after the Muslim conquest led by the Berber chief, Tarik, in 711.

Vitamin

An organic molecule which is vital for an organism’s development and functioning. They must be absorbed in small quantities on a daily basis.Insufficient amounts or the absence of vitamins can respectively provoke hypovitaminosis or avitaminosis, which are the causes of various illnesses or diseases (scurvy, beriberi, osteomalacia, etc.), whilst an excessive intake of certain vitamins (essentially A and D) provokes hpervitaminosis, which is very toxic for the organism.

Vitamin B1 is involved in the metabolism of carbohydrates.

Viviparity

Reproduction strategy where the eggs undergo embryo development within the female’s body.

Volatile organic compounds

Substances composed of carbon and hydrogen released into the atmosphere in a gas form. Their origins are either anthropogenic (petrol refining, solvent evaporation, etc.) or natural (plant emissions, the process of decomposition, etc.).

Voltaire, born François-Marien Arouet (1694-1778)

A French writer and philosophers (1694-1778). An emblem of the Enlightenment, he was driven by a polemical spirit and an irreverent style which would earn him stays in prison and several more or less forced exiles. Engaged very quickly in a reforming vision of justice and society, he attacked Christian dogmas and the political regime in France, based on ‘divine right’, in his Philosophical Letters of 1734. Voltaire tried his hand at numerous literary genres, including the novel, theatre, as well as the fairy tale, with Zadig (1747), which forced him to go into exile in Prussia, at the invitation of Frederick II. His novel Candide (1759) denounces injustices, wars, religious fanaticism and the intolerance which affects humanity. A brilliant polemicist, he fought tirelessly for liberty, tolerance and the triumph of reason over obscurantism. The banning in France of the majority of his work (printed abroad, then reintroduced) did not prevent him from knowing great success amongst the liberal

volume of distribution

A parameter characterizing the distribution of the active substance in the human body.

von Bismarck, Otto (1815-1898)

A Prussian statesman. He was successively and simultaneously Minister President of the kingdom of Prussia from 1862 to 1890 and the first Federal Chancellor of the new German Empire from 1871 until 1890. He played a vital role in German unification and in the outbreak of the conflict between France and Germany in 1870.

von Braun, Wernher

Born in eastern Prussia in 1912, Werder von Braun became interested in rockets at a very early age. After studying in Zurich and Berlin he devoted his doctoral thesis to rocket propulsion. From the beginning of his professional career he worked for the German army. Becoming a member of the Nazi party in 1937 (and then the SS) he developed the first ballistic missile, the famous V2, of which thousands of examples were launched at Great Britain, The Netherlands and Belgium.

In 1945 he gave himself up to the Americans who took him to their country. There he very quickly directed a guided missile programme and then played a decisive role in the launching of the first American satellite. From 1960 onwards he spent the remainder of his career at NASA, in particular directing the Mercury, Gemini and Apollo manned spaceflight programmes. He left NASA in 1972 and died in Virginia in 1977.

von Clausewitz, Carl Philipp Gottlieb (1780-1831)

A Prussian officer and military theorist. Author of a major treatise on military strategy: On war, 1832.

von Clausewitz, Karl (1780-1831)

A Prussian officer, the author of a major treatise on military strategy: On War (Vom Kriege). Even today, this book is considered as the basis of the theory of military strategy.

von Schlieffen, Alfred (1833-1913)

A Prussian strategist. He built his career at the heart of the German military staff, as far as becoming its Chief of Staff in 1891. In 1905 he concocted a plan, which would bear his name, consisting of launching a lightning offensive to the West against the French armies in passing widely through Belgium beyond the Meuse. He retired in 1906 and was named Field Marshall in 1911. He died in Berlin on January 4, 1913, nineteen months before the launching of hostilities…and his plan being put partly into practice by his successor, Helmuth von Moltke.



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