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Keming Yang, Tao Zhang, Li-bo Wang, Xiao-li Qian, Lin-wei Wang, Shi-wen Liu
Combined with the Hyperion hyperspectral image and ALI high spatial resolution band of the EO-1 satellite, the paper puts forward the harmonic analysis fusion (HAF) algorithm of hyperspectral image and the derivative spectral d-value's information entropy (DSD-IE) model of the spectral-fused information fidelity evaluation. Through calculating and evaluating some parameters such as the DSD-IE values, average gradient and standard deviation of the sample spectra meanwhile compared with the fused hyperspectral images by the traditional methods like the principal component analysis (PCA), Gram-Schmidt and wavelet, the fused hyperspectral iamge by the HAF has proved to have the higher information degree of spatial integration and spectral fidelity, and the better superiorities in the reliability, accuracy and applicability...
September 2013: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
Tao Wang, Chaoxiu Qi, Qigen Li, Lijie Dong, Jiezheng Yang
PURPOSE: To study the reliability of digital slit lamp microscope as a tool for quantitative analysis in one dimensional size measurement. METHODS: Three single-blinded observers acquired and repeatedly measured the images with a size of 4.00 mm and 10.00 mm on the vernier caliper, which simulatated the human eye pupil and cornea diameter under China-made digital slit lamp microscope in the objective magnification of 4 times, 10 times, 16 times, 25 times, 40 times and 4 times, 10 times, 16 times, respectively...
November 2010: Yan Ke Xue Bao, Eye Science
Xian-Jie Song, Chen-Jie Xu, Xiao-Gu Liu, Zhi-Feng Zhang
The traditional light sources in the diagnostic method of tongue collection such as daylight or even candles are easily affected by weather and environment. It isn't favorable for doctors to obtain the accurate information of the tongue condition. The authors' introduce the electric light sources to compensate or replace daylight to obtain stable and real tongue image and scientific results. Lighted by lamps with different radiation spectrum power distribution property, various color rendition and color temperature, the same object will indicate different colors...
May 2008: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
P R L'Estrange, J Rowell, M J Stokes
The feasibility of examining electro-mechanical activity of the human masseter muscles using non-invasive recording techniques was examined in six healthy dentate adults (aged 34-57 years). Electrical activity of the muscle was examined by surface electromyography (EMG) and the mechanical activity, in the form of muscle sounds, was examined by acoustic myography (AMG). Bilateral recordings of EMG and AMG were made simultaneously using composite probes which were placed on the skin over the masseter muscles...
July 1993: Journal of Oral Rehabilitation
T G Smith, M J Stokes
The effect of contact pressure on acoustic myographic (AMG) recordings was examined during voluntary isometric contractions of the human quadriceps muscle in 20 normal males. A piezoelectric disk for recording muscle sounds was placed over rectus femoris at approximately mid-thigh and secured with a rubber electromyography (EMG) strap. Contact pressure was monitored by a load cell placed between the AMG device and the strap. With the subject seated, force at different percentage levels of maximum voluntary contraction (MVC) were held for 5 s each...
April 1993: Journal of Neuroscience Methods
P Veselý, H Lücers, M Riehle, J Bereiter-Hahn
Scanning acoustic microscopy (SAM) observes all mechanical properties of living cells. Subtraction of the SAM images (SubSAM) of live cells was developed as a method for investigating minimal changes in cellular topography and elasticity. The image formation in the SubSAM takes into account the motion of cell mass as well as the changes of tension. High spatial and temporal resolution of the SubSAM revealed the structure of motile processes that develops at increasing time intervals, thus allowing the arising complexity of motion to be registered and investigated...
1994: Cell Motility and the Cytoskeleton
M J Stokes, P A Dalton
Sounds produced during voluntary isometric contractions of the quadriceps muscle were recorded by acoustic myography (AMG) in seven healthy adults. With the subject seated, surface AMG and electromyography (EMG) were recorded over rectus femoris (RF) during isometric contractions, at different levels of maximum voluntary force. The AMG and EMG signals were amplified and integrated (IAMG and IEMG). The relationships between force and IAMG (r = 0.98 +/- 0.01, mean +/- 1 SD) and force and IEMG (r = 0.99 +/- 0) were linear in all subjects...
February 1991: Journal of the Neurological Sciences
P A Dalton, M J Stokes
The relationship between acoustic myography (AMG), electromyography (EMG) and force during submaximal dynamic contractions was examined in the biceps brachii muscles of eight healthy males (aged 17-26 years). Different weights were lifted and lowered at a constant speed, using a wall pulley system, to perform concentric and eccentric contractions, respectively. Integrated AMG (iAMG) and integrated EMG (iEMG) activity both increased linearly with force during concentric (iAMG r = 0.94; iEMG r = 0.99) and eccentric (iAMG r = 0...
1991: European Journal of Applied Physiology and Occupational Physiology
M J Stokes, P A Dalton
Sounds produced during voluntary isometric contractions of the quadriceps muscle were studied by acoustic myography (AMG) in five healthy adults. With the subject seated, isometric force, surface electromyography (EMG), and AMG were recorded over rectus femoris, and the EMG and AMG signals were integrated (IEMG and IAMG). Contractions lasting 5 s each were performed at 10, 25, 50, 60, 75, and 100% of maximum voluntary contraction (MVC) force. Fatigue was then induced by repeated voluntary contractions (10 s on, 10 s off) at 75% MVC until only 40% MVC could be sustained...
October 1991: Journal of Applied Physiology
M J Stokes, R G Cooper
The relationships between force, electromyography (EMG), and muscle sounds recorded by acoustic myography (AMG) were investigated for both voluntary and stimulated isometric contractions in the adductor pollicis muscle. Voluntary activity was performed at 10, 25, 50, 75, 85, and 100% of maximal voluntary contraction (MVC) force. Stimulated contractions were produced by supramaximal electrical stimulation of the ulnar nerve at the wrist at frequencies of 10, 20, 30, 50, 70, and 100 Hz. Contractions lasted for 4 s each, and were performed in random order with a 3-min rest between each...
May 1992: Journal of Applied Physiology
E Bennett, G A Kimmich
Activity of the Na(+)-glucose cotransporter in LLC-PK1 epithelial cells was assayed by measuring sugar-induced currents (IAMG) using whole cell recording techniques. IAMG was compared among cells by standardizing the measured currents to cell size using cell capacitance measurements. IAMG at a given membrane potential was measured as a function of alpha-methylglucoside (AMG) concentration and can be fit to Michaelis-Menten kinetics. IAMG at varying Na+ concentrations can be described by the Hill equation with a Hill coefficient of 1...
February 1992: American Journal of Physiology
D J Lee, M J Stokes, R J Taylor, R G Cooper
In 31 normal subjects (17 male), aged 19-48 years, and 8 patients with chronic low back pain (4 male), aged 37-55 years, the repeatability of surface recordings of acoustic myography (AMG) and electromyography (EMG) were examined in the lumbar paraspinal muscles. Five isometric test positions were examined. In 21 of the normal subjects, four positions tested were: quiet standing, half extension from prone lying, full extension from prone with and without resistance. In 10 of the normal subjects and the 8 back pain patients, a standardised, unsupported horizontal position with the upper body over the end of a couch was tested...
1992: European Journal of Applied Physiology and Occupational Physiology
P A Dalton, M J Comerford, M J Stokes
Integrated acoustic myography (IAMG) and electromyography (IEMG) were recorded over rectus femoris (RF) in six healthy subjects during a series of intermittent isometric contractions of quadriceps. Contractions were held for 10 sec with 10 sec rest between each, commencing at 75% maximum voluntary contraction (MVC) force and continuing to 40% MVC. The IAMG activity initially decreased (75%-60% MVC) in a linear relationship (r = 0.9) with fatigue (i.e. force loss) but then plateaued and increased once force fell below 52% MVC...
May 1992: Journal of the Neurological Sciences
F Wright, M J Stokes
The symmetry of paraspinal muscle activity was examined in 15 healthy adults (aged 31-60 years). Acoustic myography (AMG), which provides a measure of force, was recorded with electromyography (EMG) to assess electromechanical relationships during contraction. Bilateral recordings of EMG and AMG were made over the paraspinal muscles at the level of the 4th lumbar vertebra during a fatiguing test manoeuvre. Subjects were strapped to a hinged couch in the prone position. When the upper part of the couch was lowered, subjects maintained the upper body (above the anterior, superior iliac spines) unsupported, in the horizontal position for 60 sec...
September 1992: Scandinavian Journal of Rehabilitation Medicine
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