Sigve Tjøtta (1 March 1930 – 28 August 2023) was a Norwegian

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

Early life

He was born in

Klepp Klepp is a municipality in Rogaland county, Norway. It is located in the traditional district of Jæren. The administrative centre of the municipality is the village of Kleppe. Other villages in Klepp include Klepp stasjon, Orre, Orstad, Polle ...

. He took the

cand.real. Candidatus realium or candidata realium (abbreviated cand. real.) is a former academic degree used in Norway, and conferred in mathematics and natural sciences. It was abolished in 1985. There was originally no set duration for the completion of th ...

degree in 1954 and the dr.philos. degree in 1960, both at the

University of Oslo The University of Oslo ( no, Universitetet i Oslo; la, Universitas Osloensis) is a public research university located in Oslo, Norway. It is the highest ranked and oldest university in Norway. It is consistently ranked among the top universit ...

. His doctoral thesis was ''On Some Non-linear Effects in Sound Fields, with Special Emphasis on the Generation of Vorticity and the Formation of Streaming Patterns''. He worked as a

research assistant A research assistant (RA) is a researcher employed, often on a temporary contract, by a university, a research institute or a privately held organization, for the purpose of assisting in academic or private research. Research assistants are not in ...

in Oslo from 1954 to 1956, 1957 to 1958 and 1959 to 1960. In between he studied at

Brown University Brown University is a private research university in Providence, Rhode Island. Brown is the seventh-oldest institution of higher education in the United States, founded in 1764 as the College in the English Colony of Rhode Island and Providenc ...

from 1956 to 1957 and at the

Max Planck Institute Max or MAX may refer to: Animals * Max (dog) (1983–2013), at one time purported to be the world's oldest living dog * Max (English Springer Spaniel), the first pet dog to win the PDSA Order of Merit (animal equivalent of OBE) * Max (gorilla) (1 ...

. Among his advisors were

Johan Peter Holtsmark Johan Peter Holtsmark (13 February 1894 – 10 December 1975) was a Norwegian physicist, who studied spectral line broadening and electron scattering. In 1929, while at the Norwegian Institute of Technology, Holtsmark established acoustics res ...

Career

He was appointed

docent The title of docent is conferred by some European universities to denote a specific academic appointment within a set structure of academic ranks at or below the full professor rank, similar to a British readership, a French " ''maître de conf ...

at the

University of Bergen The University of Bergen ( no, Universitetet i Bergen, ) is a research-intensive state university located in Bergen, Norway. As of 2019, the university has over 4,000 employees and 18,000 students. It was established by an act of parliament in 194 ...

in 1960, and was promoted to professor in 1963. He succeeded Oddvar Bjørgum, and had responsibility for the university's education in

applied mathematics Applied mathematics is the application of mathematical methods by different fields such as physics, engineering, medicine, biology, finance, business, computer science, and industry. Thus, applied mathematics is a combination of mathematical s ...

. His fields of research include

plasma Plasma or plasm may refer to: Science * Plasma (physics), one of the four fundamental states of matter * Plasma (mineral), a green translucent silica mineral * Quark–gluon plasma, a state of matter in quantum chromodynamics Biology * Blood pla ...

nonlinear acoustics Nonlinear acoustics (NLA) is a branch of physics and acoustics dealing with sound waves of sufficiently large amplitudes. Large amplitudes require using full systems of governing equations of fluid dynamics (for sound waves in liquids and gas ...

hydroacoustics Hydroacoustics is the study and application of sound in water. Hydroacoustics, using sonar technology, is most commonly used for monitoring of underwater physical and biological characteristics. Hydroacoustics can be used to detect the depth ...

and

acoustic streaming Acoustic streaming is a steady flow in a fluid driven by the absorption of high amplitude acoustic oscillations. This phenomenon can be observed near sound emitters, or in the standing waves within a Kundt's tube. Acoustic streaming was explaine ...

. He was also the dean of the Faculty of Mathematics and Natural Sciences from 1975 to 1977, and has held positions in

NAVF The Norwegian Research Council for Science and the Humanities (Norges almenvitenskapelige forskningsråd, NAVF) was one of Norway's five research councils. It was established in 1949. NAVF was responsible for funding the natural sciences. In 1993, t ...

, NTVF, and in the national committee of the

International Union of Theoretical and Applied Mechanics The International Union for Theoretical and Applied Mechanics (IUTAM) is an affiliation of about 500 mechanicians in about 50 countries, and involving about 20 associated organizations, including the International Council for Science (ICSU). The p ...

. He has also been a visiting scholar at the

University of Texas The University of Texas at Austin (UT Austin, UT, or Texas) is a public research university in Austin, Texas. It was founded in 1883 and is the oldest institution in the University of Texas System. With 40,916 undergraduate students, 11,075 ...

Personal life

Tjøtta married Jacqueline Naze, a colleague, in 1964—they barely survived a car crash sustained on their

honeymoon A honeymoon is a vacation taken by newlyweds immediately after their wedding, to celebrate their marriage. Today, honeymoons are often celebrated in destinations considered exotic or romantic. In a similar context, it may also refer to the phase ...

. They have since done extensive research together. After retirement from the professor chair, the couple moved to

Oslo Oslo ( , , or ; sma, Oslove) is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of in 2022, while the city's greater urban area had a population of ...

. Tjøtta's most prominent hobby is

long-distance running Long-distance running, or endurance running, is a form of continuous running over distances of at least . Physiologically, it is largely aerobic in nature and requires stamina as well as mental strength. Within endurance running comes two d ...

. He discovered his talent during a stay in the United States, where

jogging Jogging is a form of trotting or running at a slow or leisurely pace. The main intention is to increase physical fitness with less stress on the body than from faster running but more than walking, or to maintain a steady speed for longer periods ...

was popular. He ran the

marathon The marathon is a long-distance foot race with a distance of , usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair div ...

in 3:17.02 hours at the age of 66, and the

half marathon A half marathon is a road running event of —half the distance of a marathon. It is common for a half marathon event to be held concurrently with a marathon or a 5K race, using almost the same course with a late start, an early finish or shortcu ...

in 1:43.09 hours at the age of 75. He died in August 2023, aged 93.

Honors

Together with his wife, Tjøtta won a prize in

underwater acoustics Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. The water may be in the ocean, a lake, a river or a tank. Typ ...

from the

French Academy of Sciences The French Academy of Sciences (French: ''Académie des sciences'') is a learned society, founded in 1666 by Louis XIV of France, Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific me ...

. He is a fellow of the

Acoustical Society of America The Acoustical Society of America (ASA) is an international scientific society founded in 1929 dedicated to generating, disseminating and promoting the knowledge of acoustics and its practical applications. The Society is primarily a voluntary orga ...

, and a member of the

Norwegian Academy of Science and Letters The Norwegian Academy of Science and Letters ( no, Det Norske Videnskaps-Akademi, DNVA) is a learned society based in Oslo, Norway. Its purpose is to support the advancement of science and scholarship in Norway. History The Royal Frederick Univer ...

. In 2002 he was decorated as a Knight, First Class of the

Royal Norwegian Order of St. Olav Royal may refer to: People * Royal (name), a list of people with either the surname or given name * A member of a royal family Places United States * Royal, Arkansas, an unincorporated community * Royal, Illinois, a village * Royal, Iowa, a cit ...

References

{{DEFAULTSORT:Tjotta, Sigve 1930 births 2023 deaths People from Klepp Norwegian mathematicians University of Oslo alumni Norwegian expatriates in the United States Norwegian expatriates in Germany Academic staff of the University of Oslo Academic staff of the University of Bergen Members of the Norwegian Academy of Science and Letters Brown University alumni