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Results 451 - 497 of 497
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Wongchaisuwat C - - 1984
The planar motion of the human knee joint is modeled, involving the relative motion of the geometry of the contacting surface between the tibia and the femur. The pure gliding motion and the pure rolling motion are formulated including the holonomic and nonholonomic constraints that must be satisfied. A control ...
Ito Y - - 1984
Hydrodynamic distribution of two-phase solvent systems in a rotating helical column subjected to centrifugal fields produced by two different types of synchronous planetary motion has been studied by the use of the combined horizontal flow-through coil planet centrifuge. With continuous elution of the mobile phase, the simpler type of motion ...
Maher J - - 1984
A quantitative microcinematographic technique for the measurement of cellular motion in response to chemical influences is described. The data are analyzed by using a magnetic digitizer connected to a computer, permitting comparison of several characteristics of such motion. When human granulocytes are placed in a gradient of formyl-methionyl-leucyl-phenylalanine (fMLP) (concentration ...
Brumfield R H - - 1984
Nineteen normal adults were studied by a uniaxial electrogoniometer to determine the range of wrist motion required to accomplish 15 activities of daily living. Activities for personal care requiring placing the hand at various locations on the body were accomplished by motion of 10 degrees of flexion to 15 degrees ...
Ishide N - - 1984
Spontaneous sarcomere motions in isolated rat cardiac muscle were measured by recording the light intensity at a point of magnified muscle image. The spontaneous sarcomere motions were located near the cut end, and not evenly distributed along the muscle. Calcium depletion markedly decreased the amplitude of the light intensity fluctuations. ...
Klymenko V - - 1984
The "motion-induced contour" is seen in an image where a motion sequence specifies a dihedral edge. Five experiments examined the role of dihedral angle size in the perception of this illusory contour. Observers used free magnitude estimation of contour perceptibility; the data were analyzed by a repeated measures ANOVA and ...
Kendal W S - - 1983
The motion of optically detected organelles in myelinated axons of Xenopus laevis was studied in axons bathed in a potassium glutamate based medium and in axons in a similar medium to which various inhibitors of axonal transport were added. Organelles in the potassium glutamate medium had a motion which was ...
Ringel E R - - 1983
We induced bronchial obstruction in 7 otherwise healthy asthmatic subjects and then measured the degree of airway obstruction and the dimensions of the chest wall including the anteroposterior (AP) diameters of the upper and lower rib cage and the abdomen and the transverse diameter of the lower rib cage. Airway ...
Enns E G - - 1983
The two-dimensional Brownian motion of circular disks is considered where these join to form groups whenever they touch. The total number of groups Nt is considered as a function of time. An upper bound for Nt-1 is derived and compared to the experimental movement of erythrocytes. Cells at pH = ...
Phillips S J - - 1983
A simple mathematical model was developed to quantify the non-muscular reactions between two adjacent segments undergoing rapid free-segment motion. Newtonian equations of motion were used to simulate the trajectories of the two segments using the input parameters of linear acceleration and muscular moment acting only about the proximal end of ...
Iino M - - 1982
Brief irradiation of 3-d-old maize (Zea mays L.) seedlings with red light (R; 180 J m(-2)) inhibits elongation of the mesocotyl (70-80% inhibition in 8 h) and reduces its indole-3-acetic acid (IAA) content. The reduction in IAA content, apparent within a few hours, is the result of a reduction in ...
Frost M - - 1982
A method of measuring trunk motion and two related motions using a tape measure and a stepstool was developed by physical therapists at our hospital. The purpose of this study was to assess the reliability of this method. Three repetitions of six motions performed by 24 subjects were each measured ...
Kleinman W B - - 1982
The natural history of untreated rotary subluxation of the scaphoid is traumatic radiocarpal arthritis, with loss of grip strength, pain with axial loading or dorsiflexion, and decrease in the total active arc of wrist motion. Operative reduction of the proximal scaphoid pole and stabilization of the distal pole by scapho-trapezio-trapezoid ...
Hughes R L - - 1982
The stethograph is an air-filled tube strapped to the chest. It was popular in the early part of the century as a means of detecting rib cage motion. When a second stethograph is strapped to the abdomen and coupled to an x-y recorded, a 'loop' is generated which characterizes the ...
Voda J - - 1982
Echocardiographic visualization of diastolic anterior motion of the posterior leaflet has proven to be diagnostic of mitral stenosis. In order to elucidate the mechanisms which underlie this finding and to explain why it is absent in some proven instances of mitral stenosis, we analyzed leaflet motion as a function of ...
Woo S L - - 1982
The primary goal of this investigation is to study whether soft tissue homeostatic responses secondary to decrease or increase in physiological stress levels and range of motion are a change of mechanical properties or a change of mass, or both. Two experimental animal studies are presented. One is a stress ...
Intaglietta M - - 1982
Spontaneous vasomotor activity was studied in the sandwich window preparations of the subcutaneous fasciae of the dorsal skin of rats. Measurements of the periodic changes in diameter related to the length of the active vessel show that this phenomenon causes substantial periodic volumetric displacements in tissue. We propose the hypothesis ...
Bishop E A - - 1981
The production of chemo-mechanical effects in a reconstituted system of purified muscle proteins had been studied. It was found that the "streaming" effects observed (by previous workers) in the circular slit of a stream cell were observed under conditions where the absence of artefacts could not be guaranteed. In particular, ...
Gerbino W - - 1981
Two new conditions of presentation of a bistable motion display are studied, where a competition between monoptic and monoptic plus dichoptic information is supposed to be involved. Data contradict the expectation that a dichoptic motion signal could cooperate with a monocular one. A different interpretation of the combination of monoptic ...
Cherry R J - - 1980
Oligosaccharide chains on the surfce of human erythrocytes were labeled with the probe eosin 5-thiosemicarbazide. The probe was conjugated to aldehydes produced by oxidation of sialic acid and galactose residues. The probe is associated mostly with glycophorin A after sialic acid labeling, whereas multiple components, including band 3 and lipids, ...
Becker H - - 1980
We have presented a new method of dynamic splinting that allows a greater range of protected motion under constant tension. The device has been designed for use with newer methods of tendon repair in situtations where early controlled motion is allowed.
Volz R G - - 1980
The wrist joint is a complex linkage between forearm and hand which is capable of an impressive arc of motion yet retaining a remarkable degree of stability. Carpal stability is derived from numerous intra-and intercarpal ligaments in addition to closely approximated wrist flexors and extensors. Motion occurring at the carpus ...
Burchfiel B C - - 1979
Plate tectonics offers an explanation for the present motions and heterogeneity of the rocks that form the external part of the Earth. It explains the origin of the first-order heterogeneity of oceanic and continental lithospheres. Furthermore, it explains the youth and simplicity of the oceanic lithosphere and offers the potential ...
Oman C M - - 1979
An upper bound on the magnitude of semicurcular canal cupula motion was experimentally determined in the isolated labyrinth of the skate, Raja erinacea. To visualize the cupula, a glass pipette was pushed through the ampullary wall, and local regions of the cupula were stained by slow infusion of small amounts ...
Masters W M - - 1979
A new, noncontact, optical technique for measurement of movements smaller than a few micrometers has been used to record cuticular motion of insects as they produce sound. The instrument described is highly sensitive to surface movement and offers good spatial resolution, broad dynamic range, tolerance of substantial background motion of ...
Katdare A
Echocardiographic features of interventricular septum were studied in four patients with constrictive pericarditis. The systolic motion was normal in one patient and paradoxic in the other three. All four patients had an abrupt anterior motion which was followed by a sudden brisk posterior motion immediately in early diastole, following the ...
Gibson E J - - 1979
Three experiments investigated the perception of substance and shape as invariant properties of objects by three-month-old infants. In experiment 1, infants were habituated to two differently shaped objects undergoing a rigid motion. After habituation of the infants, the objects were presented undergoing a different rigid motion, or undergoing a deforming ...
- - 1978
In the report by C. W. McCutchen [197, 691 (1977)], the sentence in paragraph 2, column 3, "The downward motion is an inversion of the upward motion about a point on the axis of samara spin" is in error. It should be replaced by "The downward motion is a reflection ...
Butler K W - - 1978
The effects of a series of sterols on molecular order and motion in bilayers formed from egg lecithin and dicetylphosphate were examined and correlations between order and data on permeability to 22Na+ were sought. Electron spin resonance spectra were observed for probes intercalated both in multilamellar dispersions where the effects ...
Duberstein L E - - 1978
Motion is an essential part of otolaryngologic function, and an understanding of concepts of motion is critical in teaching otolaryngology. Standard movie projection devices have intrinsic defects, such as considerable expense to make, complexity of operation, and a lack of flexibility. Slide projection transparencies (2X2) offer instructional flexibility but could ...
Taniguchi R - - 1977
EMG-RTs of biceps and triceps brachii muscles were measured in 3 different tasks: isolated motions, flexion or extension of either forearm; bilateral symmetrical motions, flexion or extension of both forearms; bilateral opposite motions, flexion of a forearm and extension of the other. EMG-RTs of opposite motions were slower than those ...
Polhemus J T - - 1976
Rocking motion is an unconscious and often unwanted phenomenon exhibited by the blind. It is usually manifested in oscillatory back and forth, side to side, or rotatory movements of the upper torso or head at about 1 Hz rate. Subjects desiring to function unobtrusively in the world of the sighted ...
Edds K T - - 1975
The motion of particles in the axopodia of Echinosphaerium nucleofilum is saltatory. In the present study, photokymograph records of 123 motions from six axopodia have been analyzed. Particles followed rectilinear paths of from 1 to 15 mum while in continuous motion at an average velocity of 0.66 plus or minus ...
Mears C E - - 1975
A systematic 12-week investigation of development of play behavior was conducted with eight socially reared rhesus monkey infants. A new, basic and primary play form termed self-motion play or peragration was identified and examined. This behavior follows a human model which includes a wide range of pleasurable activities involving motion ...
Knap F J - - 1975
A new digital system has been devised to analyze and duplicate jaw motion. The arrangement of the electronic system offers a range of versatility which includes graphic as well as numerical data analysis. The duplicator linkage is identical to the sensor linkage which, together with an accurate model transfer system, ...
Anderson D L - - 1975
The concept of a stressed elastic lithospheric plate riding on a viscous asthenosphere is used to calculate the recurrence interval of great earthquakes at convergent plate boundaries, the separation of decoupling and lithospheric earthquakes, and the migration pattern of large earthquakes along an arc. It is proposed that plate motions ...
Ebin D G - - 1975
We show that the motion of a slightly compressible fluid is near that of an incompressible fluid. That is, for a given initial velocity field, the motion of a compressible fluid with large sound speed is near to that of an idealized incompressible fluid. We consider the compressible fluid motion ...
Luyten W J - - 1974
A search has been made among the faint stars with large proper motion found on the Palomar Survey plates for objects that, statistically-judging from their magnitude, color, and proper motion-would appear to be fainter than one ten-thousandth of the sun's luminosity. A total of 122 such objects have been found, ...
Luyten W J - - 1974
The proper motion survey on plates taken with the 48-inch Schmidt telescope at Mount Palomar Observatory has now progressed to the point where some 250,000 new motions for faint stars have been measured, and 5,000 new white dwarfs and degenerate stars and 3,000 stars of low luminosity have been added.
Phillips J D - - 1970
The relative motion vector for the North American and African plates has been determined from detailed charting of the trend of the Atlantis fracture zone for over 1000 kilometers in the central North Atlantic near 30 degrees N and from identification of marine magnetic anomalies and deep-sea drilling results. The ...
Samuelson P A - - 1970
Just as simple harmonic motion, definable by a variational condition, delta [unk] ((1/2) x(2) - (1/2) x(2)) dt = 0, has motions which must conserve the sum of kinetic and potential energies, (1/2) x(2) + (1/2)x(2) congruent with constant, so in a neoclassical von Neumann economy, where all output is ...
Zambuto M - - 1970
An equation describing the reconstructed holographic images of objects in any state of motion is obtained starting from consideration of the effect of motion on coherence. The equation explicitly shows the dependence of the reconstruction on both the total displacement and the form of the law of motion. Applications to ...
Grünbaum A - - 1968
The mathematical physicist Hermann Weyl (2) has claimed that, unless machines can accomplish an infinite sequence of distinct operations in a finite time, the standard mathematical theory of motion is beset by one of Zeno's kinematical paradoxes. Hence I have compared the kinematics of several such "infinity machines" to the ...
Peterson E B - - 1965
An unusual example of convection was recently seen above large elm trees shortly after sunset. The condensation of transpirational moisture in air that was cooler than that within the tree crowns is believed to account for the readily visible convective motion above the trees.
Cohen C J - - 1964
Numerical integration of the orbits of the five outer planets over 120,000 years reveals that the distance between Pluto and Neptune at the closest approaches oscillates within a narrow range. The distance is never much less than the aphelion distance of Pluto from the orbit of Neptune. The near commensurability ...
GOULD J - - 1962
The hypothesis is that such displacement produces no disturbance of behavior within a limited "normal" range, but that a breakdown angle can be found beyond this range which will produce disturbance in motion in proportion to the magnitude of the feedback displacement. Results with two tasks specifically support the hypothesis ...
OSTERHOUT W J V - - 1952
In Nitella the protoplasm forms a layer about 15 microns thick surrounding a large central vacuole. The outer part of the protoplasm is a gel, the inner layer is a sol which is in continual motion travelling the entire length of the cell in opposite directions on opposite sides and ...
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