Lars Hansen
· Professor, Department of Earth & Environmental SciencesUniversity of Minnesota · Earth Sciences
Active 1979–2024
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About
Lars Hansen is a Professor in the Department of Earth & Environmental Sciences at the University of Minnesota Twin Cities. His research focuses on how rocks behave at extreme conditions, particularly their rheological behavior at high temperatures and pressures. Hansen's group primarily uses laboratory-based experiments to investigate the mechanisms of rock deformation at the atomic scale and how these mechanisms influence the dynamics of the solid Earth at the scale of tectonic plates. His work involves studying the generation, evolution, and interaction of lattice dislocations during the plastic deformation of rocks across a wide range of temperatures, time scales, and spatial scales. His research emphasizes the role of crystal defects, grain boundaries, and microstructural evolution in controlling the mechanical strength and viscosity of rocks. Hansen's studies extend to understanding how these defects influence large-scale processes such as seismic anisotropy in the upper mantle, the viscosity and microstructural evolution of Earth's deep interior, and the yield strength of the lithosphere. His laboratory experiments include high-resolution and high-temperature creep, high-pressure creep, and low-temperature plasticity, complemented by microscopy analysis to develop a comprehensive understanding of rock deformation physics. Hansen's work also involves examining naturally deformed rocks to validate hypotheses derived from laboratory experiments, contributing to our…
Research topics
- Biology
- Veterinary medicine
- Animal science
- Medicine
- Biotechnology
- Genetics
Selected publications
Journal of Dairy Science · 2012-01-29 · 69 citations
articleOpen accessSenior authorNormande (NO)×Holstein (HO) crossbred cows (n=251), Montbéliarde (MO)×HO crossbred cows (n=503), and Scandinavian Red (SR)×HO crossbred cows (n=321) were compared with pure HO cows (n=416) for fertility, somatic cell score (SCS), and 305-d projected milk, fat, and protein production during their first 5 lactations. The SR was a combination of Swedish Red and Norwegian Red. Cows were housed in 6 commercial herds in California and calved from June 2002 to January 2009. The NO, MO, and SR sires of…
Journal of Dairy Science · 2012-01-29 · 58 citations
articleOpen accessPure Holstein (HO) cows (n=416) were compared with Normande (NO) × HO (n=251), Montbéliarde (MO) × HO (n=503), and Scandinavian Red (SR) × HO (n=321) crossbred cows for survival, lifetime production, and profitability in 6 commercial herds in California. The SR crossbred cows were sired by both Swedish Red and Norwegian Red bulls. Cows calved from June 2002 to January 2009. For analysis of survival to subsequent calvings, lifetime production, and profitability, data were restricted to 3 of 6 her…
Journal of Dairy Science · 2017-08-24 · 38 citations
articleOpen accessSenior authorMontbéliarde (MO) × Holstein (HO) and Viking Red (VR) × HO crossbred cows were compared with pure HO cows in 8 large, high-performance dairy herds in Minnesota. All cows calved for the first time from December 2010 to April 2014. Fertility and survival traits were calculated from records of insemination, pregnancy diagnosis, calving, and disposal that were recorded via management software. Body condition score and conformation were subjectively scored once during early lactation by trained evalu…
Journal of Dairy Science · 2014-02-01 · 36 citations
articleOpen accessSenior authorTwo-breed crossbreds of Montbéliarde and Holstein (MO × HO) as well as 3-breed crossbreds of Montbéliarde and Jersey/Holstein (MO × JH) were compared with pure Holstein (HO) cows for production, somatic cell score (SCS), fertility, survival to subsequent calving, mortality, and body measurements during their first 5 lactations. Cows calved for the first time between 2005 and 2010 and were housed in either a confinement herd or a herd that had access to pasture for 165d of the year in the north c…
Journal of Dairy Science · 2011-01-22 · 34 citations
articleOpen accessBrown Swiss × Holstein crossbred cows and pure Holstein cows were compared in a designed experiment. All cows were housed in a freestall barn at the experimental station of the federal state of Saxony-Anhalt, Germany, and calved from July 2005 to August 2008. Brown Swiss × Holstein crossbred cows were mated to Holstein AI bulls for first calving and mated to Fleckvieh artificial insemination (AI) bulls for second and third calvings. Pure Holstein cows were consistently mated to Holstein AI bulls…
Frequent coauthors
- 25 shared
Brad Heins
University of Minnesota
- 17 shared
Charles W. Young
Pulmonary Associates
- 16 shared
H. Chester-Jones
University of Minnesota, Waseca
- 15 shared
P. Boettcher
- 13 shared
A.R. Hazel
University of Minnesota
- 12 shared
A.J. Seykora
University of Minnesota
- 11 shared
P.M. VanRaden
United States Department of Agriculture
- 11 shared
M.M. Schutz
Labs
Rock & Mineral Physics LaboratoryPI
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