335,605 research outputs found
Proper Ferroelectricity in the Dion?Jacobson Material CsBi2Ti2NbO10: Experiment and Theory
No full textA diverse range of materials and properties are exhibited by layered perovskites. We report on the synthesis, characterization, and computational investigation of a new ferroelectric?CsBi2Ti2NbO10, an n = 3 member of the Dion?Jacobson (DJ) family. Structural studies using variable temperature neutron powder diffraction indicate that a combination of octahedral rotations and polar displacements result in the polar structure. Density functional theory calculations reveal that the wider perovskite blocks in CsBi2Ti2NbO0 stabilize proper ferroelectricity, in contrast to the hybrid-improper ferroelectricity reported for all other DJ phases. Our results raise the possibility of a new class of proper ferroelectric materials analogous to the well-known Aurivillius phases
Oral History Interview: Pam Jacobson (1109)
No full textAbstract: In her 2010 interview with Pat Calchina, Pam Jacobson details her life in Madison. She spoke of the time period between 1974 and 1996 and of the following topics: women?s studies classes at UW Madison, lesbianism, being part of the first class of women firefighters to be hired by the Madison fire department and her 17 years as a firefighter, various lesbian activities in Madison.
Key Words: Madison (WI), Fire Chief Durkin, Marcia Holtz, Bev Buhr, Rory Ward, Ronny Greer, Liz Estrada, GALVANIZE, shirts and skins basketball at Orton Park, Lesbian Variety Show
Seconde nozze e identità materna nella Firenze del tardo Medioevo,
No full textS. Seidel Menchi, A. Jacobson Schutte, Th. KuehnInternational audienc
Marcus Jacobson, Ph.D.
No full textDr Jacobson was born in Cape Town, South Africa in 1930. Dr Jacobson received both his B.Sc. (1951) and Masters (1956) from the University of Cape Town. Dr Jacobson earned his Ph.D. from the University of Edinburgh in 1960. Dr Jacobson was Lecturer in Physiology at the University of Edinburgh Medical School from 1960-1965. Dr Jacobson was Guest Investigator in biophysics at the Naval Medical Research Institute in Bethesda, Maryland 1965-1966. Dr Jacobson was Associate Professor and Professor at Johns Hopkins University from 1967-1973. Dr Jacobson was Professor of Physiology University of Miami School of Medicine from 1973-1977. Dr Jacobson came to the University as Professor and Chair of the Department of Anatomy from 1977-1989. Dr Jacobson was named Professor of Neurobiology and Anatomy in 1989. Dr Jacobson died in 2001
Ultra-low friction W-S-N solid lubricant coating
No full textW-S-N films were deposited by reactive magnetron sputtering from WS2 target in Ar/N2 atmosphere. Besides the standard evaluation of composition, structure, morphology, hardness and cohesion/adhesion, the core objective of this paper was to analyze coating tribological behavior. The chemical composition was 34 at.% N, 12 at.% O, 29 at.% W and 25 at.% S, and the as-deposited films were completely amorphous. The film thickness was 2.3 μm, including the approximately 300-nm thick adhesion improving titanium interlayer. The friction coefficient was lower than 0.003 when sliding in dry nitrogen. The coating showed remarkable wear resistance surviving more than 2 million laps on pin-on-dics. The excellent friction properties were attributed to the formation of a thin tungsten disulfide tribofilm on the top of the wear track of the coating and on the counterpart surface. Moreover, the coating showed ability to replenish damaged areas with solid lubricant. We demonstrated that a structural transformation of the coating from an amorphous-like to a gradient quasi-ordered structure and an ordered transfer layer formation improved mechanical properties and radically decreased friction and wear
On the Jacobson radical of graded rings
No full textsummary:All commutative semigroups are described such that the Jacobson radical is homogeneous in each ring graded by
Jacobson, Matilda
No full textGustave S. Jacobson - husbandhttps://stars.library.ucf.edu/cfm-ch-memoranda-1935/1071/thumbnail.jp
Matching asteroid population characteristics with a model constructed from the YORP-induced rotational fission hypothesis
No full textFrom the results of a comprehensive asteroid population evolution model, we conclude that the YORP-induced rotational fission hypothesis is consistent with the observed population statistics of small asteroids in the main belt including binaries and contact binaries. These conclusions rest on the asteroid rotation model of Marzari et al. ([2011]Icarus, 214, 622-631), which incorporates both the YORP effect and collisional evolution. This work adds to that model the rotational fission hypothesis, described in detail within, and the binary evolution model of Jacobson et al. ([2011a] Icarus, 214, 161-178) and Jacobson et al. ([2011b] The Astrophysical Journal Letters, 736, L19). Our complete asteroid population evolution model is highly constrained by these and other previous works, and therefore it has only two significant free parameters: the ratio of low to high mass ratio binaries formed after rotational fission events and the mean strength of the binary YORP (BYORP) effect.We successfully reproduce characteristic statistics of the small asteroid population: the binary fraction, the fast binary fraction, steady-state mass ratio fraction and the contact binary fraction. We find that in order for the model to best match observations, rotational fission produces high mass ratio (> 0.2) binary components with four to eight times the frequency as low mass ratio (<0.2) components, where the mass ratio is the mass of the secondary component divided by the mass of the primary component. This is consistent with post-rotational fission binary system mass ratio being drawn from either a flat or a positive and shallow distribution, since the high mass ratio bin is four times the size of the low mass ratio bin; this is in contrast to the observed steady-state binary mass ratio, which has a negative and steep distribution. This can be understood in the context of the BYORP-tidal equilibrium hypothesis, which predicts that low mass ratio binaries survive for a significantly longer period of time than high mass ratio systems. We also find that the mean of the log-normal BYORP coefficient distribution μB10-2, which is consistent with estimates from shape modeling (McMahon and Scheeres, 2012a
유한정규 확장환에 있어 Integrality와 Jacobson Radical
No full text본 논문에서는 유한정규 확장환에 있어 몇가지 성질을 다루도록 하겠다. Martin Lorenz와 D.S. Passman에 의해 소개되어진 환에 있어서의 Integrality 성질을 보다 일반화 시키고 그 결과를 이용해 R의 Jacobson Radical J(R)과 S의 Jacobson Radical J(S)사이의 관계가 J(R)=J(S)∩R이라는 것을 보여주겠다.In this paper we consider finite normalizing extension rings. We will generalize the integrality results which are introduced by Martin Lorenz. Using this results we show that the Jacobson Radicals of R and S are related by J(S)∩R where S is a finite normalizing extension ring of R.In this paper we consider finite normalizing extension rings. We will generalize the integrality results which are introduced by Martin Lorenz. Using this results we show that the Jacobson Radicals of R and S are related by J(S)∩R where S is a finite normalizing extension ring of R
Jacobson, Charles Henry, Darwin
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/394775Surname: JACOBSON. Given Name(s) or Initials: CHARLES HENRY. Military Service Number or Last Known Location: DARWIN. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 16071.227906
Item: [2016.0049.27068] "Jacobson, Charles Henry, Darwin
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