Selecting the parameters of a standard photoelectric transducer for angle of rotation

1981 ◽  
Vol 24 (6) ◽  
pp. 460-461
Author(s):  
B. N. Ivanov
Keyword(s):  
Photoelectric Transducer ◽  
Angle Of Rotation

Geometric Analysis of the Bilobed Flap for Nasal Reconstruction Surgery

FACE ◽  
2021 ◽  
pp. 273250162199390
Author(s):  
Daniel Henick ◽  
Kelvin K. Ampem-Darko ◽  
Farah Sayegh ◽  
Paymon Sanati-Mezrahi ◽  
Mehul Bhatt ◽  
...  
Keyword(s):  
Geometric Analysis ◽  
Nasal Reconstruction ◽  
Anatomical Features ◽  
Reconstruction Surgery ◽  
Repair Technique ◽  
Bilobed Flap ◽  
Calculated Ratio ◽  
Flap Design ◽  
Objectively Measured ◽  
Angle Of Rotation

Background: Reconstruction of the nose can be difficult due to its complex anatomical features. In 1989, Zitelli described a modified version of the bilobed flap design technique using 45° and 90° angles to improve nasal reconstructions. While the bilobed flap is still frequently referenced in scholarly literature, there seems to be inconsistency in preoperative flap design; these deviations can lead to suboptimal outcomes. The authors aim to illustrate the variability in bilobed flap execution and provide guidelines in preoperative design to improve consistency. Methods: A geometrically-based approach was used to characterize the inconsistency of bilobed repair technique. The pre-operative design images from fifteen scholarly articles were analyzed via a series of measurements and computations to quantify the angle of rotation and dimensions for the primary and secondary lobes. The “Error Quotient” was a calculated ratio that objectively measured the extent to which a bilobed design deviated from Zitelli’s specifications. Results: There was a noticeable variability in the design of both the primary and secondary lobes. Bilobed designs with smaller angles of rotation, particularly of the first lobe, were associated with higher Error Quotients and greater amounts of deviation from Zitelli’s design. Designs with the smallest Error Quotients had a primary lobe rotation that approached 45°. Conclusion: Consistency of application of the bilobed flap should be established to allow for optimal results, particularly with emphasis on design of the primary lobe. This can be accomplished by including a disposable protractor and marker in their sterile kit to measure a 45° rotation.

Friction Analysis on Vane of an Existing and of a Novel Multi Vane Rotary Compressor

2013 ◽  
Vol 284-287 ◽  
pp. 763-767
Author(s):  
A.R. Sarip ◽  
M.N. Musa
Keyword(s):  
The Other ◽  
Rotary Compressor ◽  
Brushless Dc Motor ◽  
Dramatic Reduction ◽  
Brushless Dc ◽  
Inner Surface ◽  
Instantaneous Pressure ◽  
All Speeds ◽  
Friction Analysis ◽  
Angle Of Rotation

This paper presents results of a frictional analysis on a new rotating sleeve multi-vane rotary (RSMVR) compressor. The new five-vane rotary compressor is adapted from the existing concept of a rotating sleeve single-vane rotary (RSSVR) compressor, in which the extended rounded end of one vane is embedded into the inner surface of the sleeve which allows the vane to swing within a certain small angle. As the rotor rotates, this vane drives the sleeve which in turn pushes and pulls the vane into and out of the slot in the rotor, respectively. The other four vanes are similarly pushed into the respective slots in the rotor but slide out only when a sufficient centrifugal force is developed. The driving vane ensures that suction, compression and discharge of the gas occur at all speeds of rotation. Although the sleeve rotates along, due to eccentricity between the rotor and the sleeve, each tip of the four vanes still rubs against the inner surface of the sleeve. The focus of the present study limits its analysis on to only frictions between the vane tip and the inner surface of the sleeve and between the vane sides and the respective slot walls. The frictional analysis is carried out by first determining the instantaneous pressure inside the compression cell and all the associated forces that exist. This involves an analysis on the dynamics of each vane when it reciprocates and at the same time rotates eccentrically with the sleeve. The kinematics of the vane are modelled using cosine and sine rules taking the cell leading vane as a reference to the angle of rotation. In the operation the model estimates a dramatic reduction in friction which is up to 82% lower than that occurs in an existing design of an equivalent conventional multi-vane rotary compressor (MVR). A friction between the rotating sleeve and the two opposite end plates exists in the RSMVR compressor but does not in that of the MVR. This will be included in a later study but on a new integrated brushless DC motor RSMVR compressor concept and on that of the existing shaft driven MVR, to see the overall difference in the frictions exerted.

Large Deflections of a Simply Supported Beam Subjected to Moment at One End

1984 ◽  
Vol 51 (3) ◽  
pp. 519-525 ◽  
Author(s):  
P. Seide
Keyword(s):  
Linear Theory ◽  
Bending Moment ◽  
Critical Value ◽  
The Other ◽  
Large Deflections ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Elastica Theory ◽  
Angle Of Rotation

The large deflections of a simply supported beam, one end of which is free to move horizontally while the other is subjected to a moment, are investigated by means of inextensional elastica theory. The linear theory is found to be valid for relatively large angles of rotation of the loaded end. The beam becomes transitionally unstable, however, at a critical value of the bending moment parameter MIL/EI equal to 5.284. If the angle of rotation is controlled, the beam is found to become unstable when the rotation is 222.65 deg.

scholarly journals Электронное строение и спектрально-флуоресцентные свойства лазерных красителей тиопирило-4-трикарбоцианинов

2021 ◽  
Vol 129 (7) ◽  
pp. 862
Author(s):  
А.А. Ищенко ◽  
И.В. Курдюкова ◽  
М.В. Богданович ◽  
С.Л. Бондарев ◽  
А.А. Романенко ◽  
...  
Keyword(s):  
Radiative Transition ◽  
Polymethine Chain ◽  
Long Wavelength ◽  
Vibronic Interactions ◽  
Wide Range ◽  
Wavelength Absorption ◽  
Fluorescent State ◽  
Long Wavelength Absorption Band ◽  
Angle Of Rotation ◽  
Ab Initio Dft

It was found that the long-wavelength absorption band of the laser dye IR 1061 and its analogue with an unsubstituted polymethine chain is strongly broadened and decreases in intensity in polar solvents, while the fluorescence band remains narrow and practically does not change in a wide range of solvent polarities. Based on the quantum-chemical calculations of these dyes by the ab initio DFT/B3LYP/6-31G (d,p) and TDDFT methods, taking into account the polarity of the medium by the PCM method, it is shown that the reason for this difference is the weakening of solvation in the fluorescent state as compared to the ground state due to the greater equalization of the charge in the first than in the latter. An increase in the alternation of bond orders in the polymethine chain in the fluorescent state was found, which causes an increase of vibronic interactions in the radiative transition as compared to the absorptive one. Spectral effects caused by a change in the angle of rotation of phenyl groups in the thiopyrylium cycle upon excitation have been analyzed.

scholarly journals The method of taking into the drift in determining the trajectory of the curvinal movement of the tractor

1970 ◽  
pp. 25-29
Author(s):  
M Dovzhyk ◽  
O Solarov ◽  
О Kalnahus ◽  
О Tatsenko
Keyword(s):  
Automatic Control ◽  
Velocity Vector ◽  
Complete Loss ◽  
Neutral Position ◽  
Main Task ◽  
Positive Direction ◽  
Curvilinear Motion ◽  
Curvilinear Trajectory ◽  
Wheeled Vehicles ◽  
Angle Of Rotation

This article discusses how to construct a curvilinear trajectory for a four-wheeled machine with front steered wheels. Important effects on curvilinear motion are phenomena such as slipping and skidding, which in turn influence the construction of the trajectory. Knowing how the movement of the wheels affects the movement, we can accurately construct the trajectory, namely the entrance and exit of the turn. The main task we wanted to solve was to find the easiest ways to construct a curved trajectory of the machine. It is known that the angle between the velocity vector of the wheel and the positive direction of the axis of the tractor corresponding to the neutral position of the wheels is called the angle of withdrawal. It is also known that the deflection angles arising from the curvilinear movement of wheeled vehicles due to tire deformation distort the trajectory of motion and have a significant effect on the controllability of the machine up to its complete loss. Therefore, it is no coincidence that a large number of works is devoted to investigating the causes of the emergence of angles and their dependence on various factors. Tire theory is taught throughout the course of this subject, but nevertheless it cannot be assumed that the phenomenon has been sufficiently studied so that it can be confidently used in determining trajectories, which is especially important in the development of methods of automatic control of the vehicle . The angle of rotation of the wheels depends on many factors, and often these dependencies are quite complex.

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