25 research outputs found
Tool-free, Cosmetically Hidden Phone Display and Back Cover Disassembly Port
The back cover and/or display displays of many portable devices such as smartphones and tablets are often integrated with the main assembly. If the back cover assembly or the phone display needs to be removed (e.g., to access the battery) or needs to be replaced, the device owner needs to approach a service center for such work since specialized tools are often required for removal. This disclosure describes a mechanism for easy removal of back cover or display of a device without impacting aesthetics of the device. Per the techniques of this disclosure, a slot is machined or molded on the adhesive landing between the display/ back cover and the SIM tray opening. The slot can be accessed easily with the SIM tray tool or a paperclip
Gemini GMOS and WHT SAURON integral-field spectrograph observations of the AGN driven outflow in NGC 1266
We use the SAURON and GMOS integral field spectrographs to observe the active
galactic nucleus (AGN) powered outflow in NGC 1266. This unusual galaxy is
relatively nearby (D=30 Mpc), allowing us to investigate the process of AGN
feedback in action. We present maps of the kinematics and line strengths of the
ionised gas emission lines Halpha, Hbeta, [OIII], [OI], [NII] and [SII], and
report on the detection of Sodium D absorption. We use these tracers to explore
the structure of the source, derive the ionised and atomic gas kinematics and
investigate the gas excitation and physical conditions. NGC 1266 contains two
ionised gas components along most lines of sight, tracing the ongoing outflow
and a component closer to the galaxy systemic, the origin of which is unclear.
This gas appears to be disturbed by a nascent AGN jet. We confirm that the
outflow in NGC 1266 is truly multiphase, containing radio plasma, atomic,
molecular and ionised gas and X-ray emitting plasma. The outflow has velocities
up to \pm900 km/s away from the systemic velocity, and is very likely to be
removing significant amounts of cold gas from the galaxy. The LINER-like
line-emission in NGC 1266 is extended, and likely arises from fast shocks
caused by the interaction of the radio jet with the ISM. These shocks have
velocities of up to 800 km/s, which match well with the observed velocity of
the outflow. Sodium D equivalent width profiles are used to set constraints on
the size and orientation of the outflow. The ionised gas morphology correlates
with the nascent radio jets observed in 1.4 GHz and 5 GHz continuum emission,
supporting the suggestion that an AGN jet is providing the energy required to
drive the outflow.Comment: Contains 18 figures. Accepted to MNRA
Relativistic Jets in the Accretion & Collimation Zone:New Challenges Enabled by New Instruments
After The Fall: Resolving the Molecular Gas in Post-Starburst Galaxies
Post-starburst (PSB), or 'E+A', galaxies represent a rapid transitional phase
between major, gas-rich mergers and gas-poor, quiescent early-type galaxies.
Surprisingly, many PSBs have been shown to host a significant interstellar
medium (ISM), despite theoretical predictions that the majority of star-forming
gas should be expelled in AGN- or starburst-driven outflows. To-date, the
resolved properties of this surviving ISM have remained unknown. We present
high resolution ALMA continuum and CO(21) observations in six gas- and
dust-rich PSBs, revealing for the first time the spatial and kinematic
structure of their ISM on sub-kpc scales. We find extremely compact molecular
reservoirs, with dust and gas surface densities rivaling those found in
(ultra-)luminous infrared galaxies. We observe spatial and kinematic
disturbances in all sources, with some also displaying disk-like kinematics.
Estimates of the internal turbulent pressure in the gas exceed those of normal
star-forming disks by at least 2 orders of magnitude, and rival the turbulent
gas found in local interacting galaxies, such as the Antennae. Though the
source of this high turbulent pressure remains uncertain, we suggest that the
high incidence of tidal disruption events (TDEs) in PSBs could play a role. The
star formation in these PSBs' turbulent central molecular reservoirs is
suppressed, forming stars only 10% as efficiently as starburst galaxies with
similar gas surface densities. "The fall" of star formation in these galaxies
was not precipitated by complete gas expulsion or redistribution. Rather, this
high-resolution view of PSBs' ISM indicates that star formation in their
remaining compact gas reservoirs is suppressed by significant turbulent
heating.Comment: 19 pages, 9 figures, 3 tables; Accepted for publication in Ap
An EMG-Driven Biomechanical Model That Accounts for the Decrease in Moment Generation Capacity During a Dynamic Fatigued Condition
International audienceAlthough it is well known that fatigue can greatly reduce muscle forces, iris not generally included fit biomechanical models. The aim of the present. study was to develop an electromyographic-driven (EMG-driven) biomechanical model to estimate the contributions of flexor and extensor muscle groups to the net joint moment during a nonisokinetic functional movement (squat exercise) performed in nonfatigued and in fatigued conditions. A methodology that aims at balancing the decreased muscle moment production capacity following fatigue was developed. During an isometric fatigue session, a linear regression was created linking the decrease in force production capacity of the muscle (normalized force/EMG ratio) to the EMG mean frequency Using the decrease in mean frequency estimated through wavelet transforms between dynamic squats performed before and after the fatigue session as input to the previous linear regression, a coefficient accounting for the presence of fatigue in the quadriceps group was computed. This coefficient was used to constrain the moment production capacity of the fatigued muscle group within an EMG-driven optimization model dedicated to estimate the contributions of the knee flexor and extensor muscle groups to the net joint moment. During squats, our results showed significant increases in the EMG amplitudes with fatigue (+23.27% in average) while the outputs of the EMG-driven model were similar The modifications of the EMG amplitudes following fatigue were successfully taken into account while estimating the contributions of the flexor and extensor muscle groups to the net joint moment. These results demonstrated that the new procedure was able to estimate the decrease in moment production capacity of the fatigued muscle group. [DOI: 10.1115/1.4001383