scholarly journals Prostheses, pain and sequelae of amputation, as seen by the amputee

1978 ◽  
Vol 2 (1) ◽  
pp. 12-14 ◽  
Author(s):  
H. C. Chadderton
Keyword(s):  
Stance Phase ◽  
Phase Control ◽  
X Ray ◽  
Control Units ◽  
Research Level ◽  
Stump Pain ◽  
Control Pain ◽  
Arthritic Changes

Results of a survey of 19 organizations belonging to World Veterans Federation indicate that major complaints of amputees include; poor fitting, poor dissemination of knowledge to doctors and amputees regarding new prostheses, lack of opportunity for “input” from amputees at research level and-inadequate measures to deal with phantom and stump pain. Suggested improvements by amputees; decrease in weight of prostheses, reduction in maintenance for swing and stance-phase control units, development of recreational prostheses, more frequent checks through use of X-ray and film techniques, particularly during the “break-in” of a new appliance. Older veterans showed increasing concern in regard to development of consequential disabilities arising from amputation; premature arthritic changes in spine and remaining limb, circulatory problems and gastro-intestinal problems due to ingestion of drugs to control pain.

Special X-Ray Studies of Quartz Frequency Control Units

1965 ◽  
Author(s):  
R.A. Young ◽  
R.B. Belser ◽  
A.L. Bennett ◽  
W.H. Hicklin ◽  
J.C. Meaders ◽  
...  
Keyword(s):  
Frequency Control ◽  
X Ray ◽  
Control Units

scholarly journals Knee mechanisms for through-knee prostheses

1983 ◽  
Vol 7 (2) ◽  
pp. 107-112 ◽  
Author(s):  
K. Öberg
Keyword(s):  
Stance Phase ◽  
Stability Diagram ◽  
Phase Control ◽  
Swing Phase ◽  
Control Mechanisms ◽  
Knee Prostheses ◽  
Heavy Duty ◽  
Linkage Mechanism ◽  
The Stability

The most widely used knee mechanisms for through-knee amputees can be characterized as three principal types of design. These types are metal side bars with heavy duty joints, conventional knee mechanisms for above-knee amputees and special polycentric linkage mechanisms for through-knee amputees. An investigation in Sweden in 1979 showed that over 50% of the fittings were using the special polycentric linkage mechanisms for through-knee amputees. The stability diagram illustrates how voluntary and involuntary stability can be utilized by using different polycentric linkage mechanisms for through-knee amputees. The polycentric linkage mechanism can be designed for different stance phase characteristics as well as incorporation of different swing phase control mechanisms. The cosmesis of the available designs is acceptable but there is need for lighter and more compact designs especially for the young and small amputee.

Asymmetrical gait of the Saharian rodent Meriones shawi shawi (Duvernoy, 1842) (Rodentia, Mammalia): a high-speed cineradiographic analysis

1993 ◽  
Vol 71 (4) ◽  
pp. 790-798 ◽  
Author(s):  
Jean-Pierre Gasc
Keyword(s):  
High Speed ◽  
Hind Limb ◽  
Stance Phase ◽  
Swing Phase ◽  
The Body ◽  
Cycle Duration ◽  
Dynamic Effects ◽  
X Ray ◽  
Fast Running ◽  
Parasagittal Plane

The fast gait of jirds (Meriones shawi shawi) was analyzed by means of high-speed X-ray cinematographic film (500 frames/s). The gait is asymmetrical, related to the transverse gallop with a cycle duration of 0.15 s, for a speed of 1 m∙s−1. The flight phase, which can last for up to 10% of the cycle duration, follows the takeoff of one anterior limb. The kinematics of the hind limb reveal that the angular excursion of the femur is small, but is increased 100% by dorsiflexion (stance phase) and ventroflexion (swing phase) of the vertebral column. During the propulsive moment, the knee joint is stable while the ankle joint opens quickly to a wide angle (70° in 40 ms). The shank joint and the head oscillate vertically, and the relative movements of the anterior and posterior parts of the body create dynamic effects facilitating the cantilevered position of the forequarters during 35% of the cycle. This kinematic analysis reveals that these small mammals differ from large ones in the way they use the geometry of their limbs even when the limbs are moved in a parasagittal plane during fast running.

scholarly journals Stance Phase Control System of a Jumping Robot

2019 ◽  
Vol 52 (17) ◽  
pp. 111-116
Author(s):  
Mircea Ivanescu
Keyword(s):  
Control System ◽  
Stance Phase ◽  
Phase Control ◽  
Jumping Robot

Temporal phase control of soft-x-ray harmonic emission

1998 ◽  
Vol 58 (1) ◽  
pp. R30-R33 ◽  
Author(s):  
Z. Chang ◽  
A. Rundquist ◽  
H. Wang ◽  
I. Christov ◽  
H. C. Kapteyn ◽  
...  
Keyword(s):  
Phase Control ◽  
X Ray ◽  
Harmonic Emission ◽  
Temporal Phase

scholarly journals Coherent X-ray−optical control of nuclear excitons

Nature ◽  
2021 ◽  
Vol 590 (7846) ◽  
pp. 401-404
Author(s):  
Kilian P. Heeg ◽  
Andreas Kaldun ◽  
Cornelius Strohm ◽  
Christian Ott ◽  
Rajagopalan Subramanian ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Coherent Control ◽  
Extreme Ultraviolet ◽  
Spin Echo ◽  
Temporal Stability ◽  
Phase Control ◽  
Optical Control ◽  
Time Resolved ◽  
X Ray ◽  
Atomic Nuclei

AbstractCoherent control of quantum dynamics is key to a multitude of fundamental studies and applications1. In the visible or longer-wavelength domains, near-resonant light fields have become the primary tool with which to control electron dynamics2. Recently, coherent control in the extreme-ultraviolet range was demonstrated3, with a few-attosecond temporal resolution of the phase control. At hard-X-ray energies (above 5–10 kiloelectronvolts), Mössbauer nuclei feature narrow nuclear resonances due to their recoilless absorption and emission of light, and spectroscopy of these resonances is widely used to study the magnetic, structural and dynamical properties of matter4,5. It has been shown that the power and scope of Mössbauer spectroscopy can be greatly improved using various control techniques6–16. However, coherent control of atomic nuclei using suitably shaped near-resonant X-ray fields remains an open challenge. Here we demonstrate such control, and use the tunable phase between two X-ray pulses to switch the nuclear exciton dynamics between coherent enhanced excitation and coherent enhanced emission. We present a method of shaping single pulses delivered by state-of-the-art X-ray facilities into tunable double pulses, and demonstrate a temporal stability of the phase control on the few-zeptosecond timescale. Our results unlock coherent optical control for nuclei, and pave the way for nuclear Ramsey spectroscopy17 and spin-echo-like techniques, which should not only advance nuclear quantum optics18, but also help to realize X-ray clocks and frequency standards19. In the long term, we envision time-resolved studies of nuclear out-of-equilibrium dynamics, which is a long-standing challenge in Mössbauer science20.

Sign in / Sign up

Export Citation Format

Share Document