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CO2 record from the EPICA Dome C 1999 (EDC99) ice core (Antarctica) covering 650 to 800 kyr BP measured at the University of Bern, Switzerland (2008)

Lüthi, Dieter ; Le Floch, Martine ; Bereiter, Bernhard ; [et al.]

PANGAEA

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Publication Date: 2023-07-19

Keywords: Carbon dioxide; Carbon dioxide, standard deviation; DEPTH, ice/snow; Dome C; DRILL; Drilling/drill rig; EDC99; EPICA; European Project for Ice Coring in Antarctica; Gas age

Type: Dataset

Format: text/tab-separated-values, 741 data points

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Prediction of Muscle Recruitment and Its Effect on Joint Reaction Forces during Knee Exercises (1998)

Li, Guoan ; Kawamura, Kenji ; Barrance, Peter ; [et al.]

Springer

Annals of biomedical engineering 26 (1998), S. 725-733

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ISSN: 1573-9686

Keywords: Knee model ; Muscle force ; Joint dynamics ; Inverse dynamics ; Optimization ; Muscle recruitment ; Knee: reaction forces

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine , Technology

Notes: Abstract This study examined the hypothesis that muscle recruitment of the tibiofemoral joint and joint reaction forces during isometric and isokinetic exercises depends on the existing degrees of freedom of the knee and the direction and type of external load applied during exercise. When three-dimensional knee joint rotation was considered (three degrees of freedom), antagonistic muscle activities were predicted using an inverse dynamic problem formulation and muscle modeling optimization procedures. The results showed that the antagonistic activities of flexors during knee flexion/extension exercise increased the joint compressive forces and decreased the anterior tibial shear forces. Comparison of different knee joint modeling assumptions indicated that modeling a single degree of freedom in flexion/extension for the knee will underestimate the antagonistic muscle function. © 1998 Biomedical Engineering Society. PAC98: 8745Bp, 8745Dr, 8710+e

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1114/1.104

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Paper (German National Licenses)

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Spinon, soliton, and breather in the spin-1/2 antiferromagnetic chain compound KCuGaF_{6} (2015)

Izumi Umegaki, Hidekazu Tanaka, Nobuyuki Kurita, Toshio Ono, Mark Laver, Christof Niedermayer, Christian Rüegg, Seiko Ohira-Kawamura, Kenji Nakajima, and Kazuhisa Kakurai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-11-10

Description: Author(s): Izumi Umegaki, Hidekazu Tanaka, Nobuyuki Kurita, Toshio Ono, Mark Laver, Christof Niedermayer, Christian Rüegg, Seiko Ohira-Kawamura, Kenji Nakajima, and Kazuhisa Kakurai Elementary excitations of the S = 1 2 one-dimensional antiferromagnet KCuGaF 6 were investigated by inelastic neutron scattering in zero and finite magnetic fields perpendicular to the ( 1 , 1 , 0 ) plane combined with specific heat measurements. KCuGaF 6 exhibits no long-range magnetic ordering down to 50 mK … [Phys. Rev. B 92, 174412] Published Mon Nov 09, 2015

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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Overestimate of Committed Warming (2017)

Severinghaus, Jeff ; Alley, Richard B. ; Keeling, Ralph F. ; [et al.]

In: CASI

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Publication Date: 2019-07-13

Description: Palaeoclimate variations are an essential component in constraining future projections of climate change as a function of increasing anthropogenic greenhouse gases. The Earth System Sensitivity (ESS) describes the multi-millennial response of Earth (in terms of global mean temperature) to a doubling of CO2 concentrations. A recent study used a correlation of inferred temperatures and radiative forcing from greenhouse gases over the past 800,000 years to estimate the ESS from present day CO2 is about 9 degrees C, and to imply a long-term commitment of 3-7 degrees C even if greenhouse gas levels remain at present-day concentrations. However, we demonstrate that the methodology of ref. 2 does not reliably estimate the ESS in the presence of orbital forcing of ice age cycles and therefore conclude that the inferred present-day committed warming is considerably overestimated.

Keywords: Statistics and Probability; Meteorology and Climatology

Type: GSFC-E-DAA-TN44310 , Nature (ISSN 0028-0836) (e-ISSN 1476-4687); 547; 7662; E16-E17

Format: application/pdf

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NASA TECHNICAL REPORTS

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