2,277 research outputs found
Tri-condylar形状人工膝関節において後方剥離手技が完全伸展獲得におよぼす影響:新鮮凍結屍体を用いた生体力学的評価
Background/objective: The continuous improvement of knee function during deep flexion remains a challenge in total knee arthroplasty. Tri-condylar total knee arthroplasty has been designed to achieve this goal. However, the introduction of a third nonanatomic spherical condyle might prevent the joint from reaching full extension due to posterior soft tissue tightening. This study aimed to address these issues related to soft tissue tightening and full extension limitation. Methods: Biomechanical tests were performed on six cadaveric specimens of the entire lower extremities. The tri-condylar design was compared with a posterior cruciate sacrificing design of the same shape without the ball structure. Knee joint kinematics was measured, including the extension and flexion angles, the extension balance, and the extension gap. The test was repeated after release of the medial and lateral posterior intercondylar soft tissues at a safe distance from the popliteal artery and nerves. Results: Both designs resulted in a knee flexion angle up to ∼130°. The tri-condylar design showed an extension angle of -11.2 ± 5.4°, which was a significantly greater limitation than that obtained with the cruciate sacrificing design (-3.8 ± 4.7°; p = 0.047). Moreover, the extension angle of the tri-condylar design was significantly improved after the release of posterior intercondylar soft tissues (-0.1 ± 6.7°; p = 0.028). Conclusion: The tri-condylar design efficiently allowed the full extension by the release of posterior intercondylar soft tissues at a safe distance from the popliteal artery and nerves.博士(医学)・乙第1499号・令和3年3月15日© 2017 The Authors. Published by Elsevier (Singapore) Pte Ltd on behalf of Chinese Speaking Orthopaedic Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
The Role of Heating and Enrichment in Galaxy Formation
We show that the winds identified with high-redshift low-mass galaxies may
strongly affect the formation of stars in more massive galaxies that form
later. With 3D realizations of a simple linear growth model we track gas
shocking, metal enrichment, and cooling, together with dark halo formation. We
show that outflows typically strip baryonic material out of collapsing
intermediate mass halos, suppressing star formation. More massive halos can
trap the heated gas but collapse late, leading to a broad bimodal redshift
distribution, with a larger characteristic mass associated with the lower
redshift peak. This scenario accounts for the observed bell-shaped luminosity
function of early type galaxies, explains the small number of Milky Way
satellite galaxies relative to Cold Dark Matter models predictions, and
provides a possible explanation for the lack of metal poor G-dwarfs in the
solar neighborhood and the more general lack of low-metallicity stars in
massive galaxies relative to ``closed-box'' models of chemical enrichment.
Intergalactic medium heating from outflows should produce spectral distortions
in the cosmic microwave background that will be measurable with the next
generation of experiments.Comment: 19 pages, 12 figures, accepted to ApJ, models refined and minor
revisions mad
Macroscopic nucleation phenomena in continuum media with long-range interactions
Nucleation, commonly associated with discontinuous transformations between
metastable and stable phases, is crucial in fields as diverse as atmospheric
science and nanoscale electronics. Traditionally, it is considered a
microscopic process (at most nano-meter), implying the formation of a
microscopic nucleus of the stable phase. Here we show for the first time, that
considering long-range interactions mediated by elastic distortions, nucleation
can be a macroscopic process, with the size of the critical nucleus
proportional to the total system size. This provides a new concept of
"macroscopic barrier-crossing nucleation". We demonstrate the effect in
molecular dynamics simulations of a model spin-crossover system with two
molecular states of different sizes, causing elastic distortions.Comment: 12 pages, 4 figures. Supplementary information accompanies this paper
at http://www.nature.com/scientificreport
Extracting the spectral function of the cuprates by a full two-dimensional analysis: Angle-resolved photoemission spectra of Bi2Sr2CuO6
Recently, angle-resolved photoemission spectroscopy (ARPES) has revealed a
dispersion anomaly at high binding energy near 0.3-0.5eV in various families of
the high-temperature superconductors. For further studies of this anomaly we
present a new two-dimensional fitting-scheme and apply it to high-statistics
ARPES data of the strongly-overdoped Bi2Sr2CuO6 cuprate superconductor. The
procedure allows us to extract theself-energy in an extended energy and
momentum range. It is found that the spectral function of Bi2Sr2CuO6 can be
parameterized using a small set of tight-binding parameters and a
weakly-momentum-dependent self-energy up to 0.7 eV in binding energy and over
the entire first Brillouin zone. Moreover the analysis gives an estimate of the
momentum dependence of the matrix element, a quantity, which is often neglected
in ARPES analyses.Comment: 8 pages, 5 figure
Doping dependence of the shadow band in La-based cuprates studied by angle-resolved photoemission spectroscopy
The shadow band (SB) in La-based cuprate family (La214) was
studied by angle-resolved photoemission spectroscopy (ARPES) over a wide doping
range from to . Unlike the well-studied case of the Bi-based
cuprate family, an overall strong, monotonic doping dependence of the SB
intensity at the Fermi level () was observed. In contrast to a previous
report for the presence of the SB only close to , we found it exists in
a wide doping range, associated with a doping-independent wave
vector but strongly doping-dependent intensity: It is the strongest at and systematically diminishes as the doping increases until it becomes
negligible in the overdoped regime. This SB with the observed doping dependence
of intensity can in principle be caused by the antiferromagnetic fluctuations
or a particular form of low-temperature orthorhombic lattice distortion known
to persist up to in the system, with both being weakened with
increasing doping. However, a detailed binding energy dependent analysis of the
SB at does not appear to support the former interpretation, leaving
the latter as a more plausible candidate, despite a challenge in quantitatively
linking the doping dependences of the SB intensity and the magnitude of the
lattice distortion. Our finding highlights the necessity of a careful and
global consideration of the inherent structural complications for correctly
understanding the cuprate Fermiology and its microscopic implication.Comment: Note the revised conclusion and author list; To appear in New J. Phy
Simulations of denuded-zone formation during growth on surfaces with anisotropic diffusion
We have investigated the formation of denuded zones during epitaxial growth on surfaces exhibiting anisotropic diffusion of adparticles, such as Si(001)-2x1, using Monte Carlo simulations and a continuum model. In both the simulations, which were mainly for low-temperature cases (small critical clusters), and the continuum model, appropriate for high-temperature cases (large critical clusters), it was found that the ratio of denuded-zone widths Wf and Ws in the fast- and slow-diffusion directions scales with the ratio Df/Ds of the diffusion constants in the two directions with a power of 1/2, i.e., Wf/Ws ≈ (Df/Ds)1/2, independent of various conditions including the degree of diffusion anisotropy. This supplies the foundation of a method for extracting the diffusion anisotropy from the denuded zone anisotropy which is experimentally measurable. Further, we find that unequal probabilities of a diffusing particle sticking to different types of step edges [e.g., S A and SB steps on Si(001)] does not affect the relation Wf/Ws ≈ (Df/Ds)1/2 seriously unless the smaller of the two sticking probabilities is less than about 0.1. Finally, we examined the relation between the number of steps and the number of sites visited in anisotropic random walks, finding it is better described by a crossover from one-dimensional to two-dimensional behavior than by scaling behavior with a single exponent. This result has bearing on scaling arguments relating denuded-zone widths to diffusion constants for anisotropic diffusion.open7
Supermassive black hole ancestors
We study a model in which supermassive black holes (SMBHs) can grow by the
combined action of gas accretion on heavy seeds and mergers of both heavy
(m_s^h=10^5 Msol) and light (m_s^l = 10^2 Msol) seeds. The former result from
the direct collapse of gas in T_s^h >1.5x10^4K, H_2-free halos; the latter are
the endproduct of a standard H_2-based star formation process. The H_2-free
condition is attained by exposing halos to a strong (J_21 > 10^3) Lyman-Werner
UV background produced by both accreting BHs and stars, thus establishing a
self-regulated growth regime. We find that this condition is met already at z
close to 18 in the highly biased regions in which quasars are born. The key
parameter allowing the formation of SMBHs by z=6-7 is the fraction of halos
that can form heavy seeds: the minimum requirement is that f_heavy>0.001; SMBH
as large as 2x10^10 Msol can be obtained when f_heavy approaches unity.
Independently of f_heavy, the model produces a high-z stellar bulge-black hole
mass relation which is steeper than the local one, implying that SMBHs formed
before their bulge was in place. The formation of heavy seeds, allowed by the
Lyman-Werner radiative feedback in the quasar-forming environment, is crucial
to achieve a fast growth of the SMBH by merger events in the early phases of
its evolution, i.e. z>7. The UV photon production is largely dominated by stars
in galaxies, i.e. black hole accretion radiation is sub-dominant.
Interestingly, we find that the final mass of light BHs and of the SMBH in the
quasar is roughly equal by z=6; by the same time only 19% of the initial baryon
content has been converted into stars. The SMBH growth is dominated at all
epochs z > 7.2 by mergers (exceeding accretion by a factor 2-50); at later
times accretion becomes by far the most important growth channel. We finally
discuss possible shortcomings of the model.Comment: 12 pages, 9 figures, 1 table, MNRAS in pres
The mass and temperature functions in a moving barrier model
In this paper, I use the extension of the excursion set model of Sheth &
Tormen (2002) and the barrier shape obtained in Del Popolo & Gambera (1998) to
calculate the unconditional halo mass function, and the conditional mass
function in several cosmological models. I show that the barrier obtained in
Del Popolo & Gambera (1998), which takes account of tidal interaction between
proto-haloes, is a better description of the mass functions than the spherical
collapse and is in good agreement with numerical simulations (Tozzi & Governato
1998, and Governato et al. 1999). The results are also in good agreement with
those obtained by Sheth & Tormen (2002), only slight differences are observed
expecially at the low mass end. I moreover calculate, and compare with
simulations, the temperature function obtained by means of the mass functions
previously calculated and also using an improved version of the M-T relation,
which accounts for the fact that massive clusters accrete matter
quasi-continuously, and finally taking account of the tidal interaction with
neighboring clusters. Even in this case the discrepancy between the
Press-Schecter predictions and simulations is considerably reduced.Comment: 23 pages; 11 encapsulated figures. Accepted for publication in MNRA
X-ray Absorption Near-Edge Structure calculations with pseudopotentials. Application to K-edge in diamond and alpha-quartz
We present a reciprocal-space pseudopotential scheme for calculating X-ray
absorption near-edge structure (XANES) spectra. The scheme incorporates a
recursive method to compute absorption cross section as a continued fraction.
The continued fraction formulation of absorption is advantageous in that it
permits the treatment of core-hole interaction through large supercells
(hundreds of atoms). The method is compared with recently developed
Bethe-Salpeter approach. The method is applied to the carbon K-edge in diamond
and to the silicon and oxygen K-edges in alpha-quartz for which polarized XANES
spectra were measured. Core-hole effects are investigated by varying the size
of the supercell, thus leading to information similar to that obtained from
cluster size analysis usually performed within multiple scattering
calculations.Comment: 11 pages, 4 figure
Pathways to massive black holes and compact star clusters in pre-galactic dark matter haloes with virial temperatures > 10000K
Large dynamic range numerical simulations of atomic cooling driven collapse
of gas in pre-galactic DM haloes with T_vir ~ 10000 K show that the gas loses
90% and more of its angular momentum before rotational support sets in. In a
fraction of these haloes where the metallicity is low and UV radiation
suppresses H_2 cooling, conditions are thus very favourable for the rapid
build-up of massive black holes. Depending on the progression of metal
enrichment, the continued suppression of H_2 cooling by external and internal
UV radiation and the ability to trap the entropy produced by the release of
gravitational energy, the gas at the centre of the halo is expected to form a
supermassive star, a stellar-mass black hole accreting at super-Eddington
accretion rates or a compact star-cluster undergoing collisional run-away of
massive stars at its centre. In all three cases a massive black hole of
initially modest mass finds itself at the center of a rapid inflow of gas with
inflow rates of ~ 1 M_solar\yr. The massive black hole will thus grow quickly
to a mass of 10^5 to 10^6 M_solar until further inflow is halted either by
consumption of gas by star formation or by the increasing energy and momentum
feedback from the growing massive black hole. Conditions for the formation of
massive seed black holes in this way are most favourable in haloes with T_vir ~
15000 K and V_vir ~ 20 km\s with less massive haloes not allowing collapse of
gas by atomic cooling and more massive haloes being more prone to
fragmentation. This should imprint a characteristic mass on the mass spectrum
of an early population of massive black hole seeds in pre-galactic haloes which
will later grow into the observed population of supermassive black holes in
galactic bulges.Comment: 13 pages, 8 figures. Submitted to MNRA
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