Correction: “Demonstrating the Direction of Angular Velocity in Circular Motion,” by S. Demircioglu, K. Yurumezoglu, and H. Isik

2015 ◽  
Vol 53 (8) ◽  
pp. 453-453
Keyword(s):  
Angular Velocity ◽  
Circular Motion

Demonstrating the Direction of Angular Velocity in Circular Motion

2015 ◽  
Vol 53 (6) ◽  
pp. 360-362 ◽  
Author(s):  
Salih Demircioglu ◽  
Kemal Yurumezoglu ◽  
Hakan Isik
Keyword(s):  
Angular Velocity ◽  
Circular Motion

scholarly journals ON THE PROBLEM OF RADIATION FRICTION BEYOND FOUR AND SIX DIMENSIONS

2008 ◽  
Vol 23 (29) ◽  
pp. 4677-4686 ◽  
Author(s):  
A. MIRONOV ◽  
A. MOROZOV
Keyword(s):  
Angular Velocity ◽  
Friction Force ◽  
Transversality Condition ◽  
Space Time ◽  
Constant Angular Velocity ◽  
Circular Motion ◽  
Six Dimensions ◽  
Special Case ◽  
Radiation Friction Force

We count the number of independent structures which can arise in expressions for radiation friction force in different even space–time dimensions and demonstrate that their number is too big at d ≥ 8 to allow determination of this force from the transversality condition alone, as was done by B. Kosyakov in 6d. This implies that in general one cannot bypass a tedious calculation involving explicit regularization and evaluation of emerging counterterms. However, simple Kosyakov's method works nicely in any dimension for the special case of circular motion with constant angular velocity.

Conics and a generalised conical pendulum

2019 ◽  
Vol 103 (556) ◽  
pp. 28-40
Author(s):  
Daniel Daners ◽  
Theresa Wigmore
Keyword(s):  
Angular Velocity ◽  
Horizontal Plane ◽  
Circular Motion ◽  
The Other

There is a long tradition of using geometry to solve problems from mechanics. Unfortunately this tradition is not practised much in schools and university any more.With this exposition we would like to demonstrate how elementary properties of ellipses can be used to solve a problem related to the conical pendulum. The problem of the conical pendulum is to consider a mass attached to one end of a light inextensible string of length with the other end attached at the top of a vertical rod. The mass is moving about the rod in uniform circular motion in a horizontal plane. Given the angular velocity of the mass, the question is to determine the angle the string makes with the rod.

scholarly journals Analysis of rotating object using video tracker

2017 ◽  
Vol 1 (2) ◽  
pp. 75-80 ◽  
Author(s):  
Djoko Untoro Suwarno
Keyword(s):  
High Resolution ◽  
Angular Velocity ◽  
Initial Velocity ◽  
Angular Acceleration ◽  
Circular Motion ◽  
Motion Measurement ◽  
Camera Position

The purpose of this paper is to show the use of video tracker to analyze circular motion. Measurement of circular motion such as angular velocity and angular acceleration is not easy to do observation and measurement directly. Through the video tracker tool, the analysis of speed and rotation acceleration becomes easier. The rotating object used as a research object is a spinner fidget. The initial velocity of the rotation depends on the pull of the finger on the spinner. The duration of rotating spinner fidget depends on the inertia and attenuation that occurs. Camera position and resolution of the camera greatly determine the data on the video tracker. The standard camera capability of 30 frames per second is less capable of capturing objects that rotate with high resolution.

scholarly journals The uniform circular motion with invariable normal spin of a rigidly and uniformly electrified sphere, IV

1937 ◽  
Vol 159 (899) ◽  
pp. 570-591 ◽  
Keyword(s):  
Electromagnetic Field ◽  
Angular Velocity ◽  
Circular Orbit ◽  
Normal Force ◽  
Equations Of Motion ◽  
Circular Motion ◽  
Classical Electrodynamics ◽  
Quadratic Polynomials ◽  
Total Reaction

In order to exhibit clearly and fully the possibilities inherent in classical electrodynamics when it is developed rigorously without approximations or unnecessary restrictions I have in this paper worked out completely the case in which the centre of the sphere describes a circle with any uniform speed less than that of light whilst it is spinning about a diameter normal to the plane of the circle with an invariable angular velocity unrestricted in magnitude or sense. It is to be noted that, although the speed of the centre is assumed for the sake of simplicity to be less than that of light, that of points on the surface of the sphere (other than the ends of the axis of spin) can be as large as we please. In §§ 2–5 general expressions for the tangential and normal force constituents and the couple constituent of the total reaction on the sphere of its own electromagnetic field are obtained from the general expressions given in paper III (§ 8), and the resulting equations of motion are written down (cf. (2·1)–(2·3) and (5·7)). There are two points to be noticed: (1) the tangential and normal force constituents are quadratic polynomials in the spin p with coefficients depending on the speed cβ of the centre and the radius R of its orbit, whilst the couple constituent is linear in p ; these results are true for any orbit with invariable spin. (2) The couple is found in § 5 to vanish identically, i. e. for all values of p, β and R , in the case of a circular orbit, owing to its symmetry with respect to a diameter; for this reason the result is probably peculiar to this class of orbit.

Zonal and tesseral harmonic perturbations of an artificial satellite

1966 ◽  
Vol 25 ◽  
pp. 323-325 ◽  
Author(s):  
B. Garfinkel
Keyword(s):  
Angular Velocity ◽  
Spherical Harmonics ◽  
Artificial Satellite ◽  
Compact Form ◽  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Secular Variations ◽  
Tesseral Harmonics

The paper extends the known solution of the Main Problem to include the effects of the higher spherical harmonics of the geopotential. The von Zeipel method is used to calculate the secular variations of orderJmand the long-periodic variations of ordersJm/J2andnJm,λ/ω. HereJmandJm,λare the coefficients of the zonal and the tesseral harmonics respectively, withJm,0=Jm, andωis the angular velocity of the Earth's rotation. With the aid of the theory of spherical harmonics the results are expressed in a most compact form.

SAF file: It's really three dimensional file

2018 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Prof. Dr. Jamal Aziz Mehdi
Keyword(s):  
Cross Section ◽  
Root Canal ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Circular Motion ◽  
Root Canal Treatment ◽  
Metal Core ◽  
Rotating Blade

The biological objectives of root canal treatment have not changed over the recentdecades, but the methods to attain these goals have been greatly modified. Theintroduction of NiTi rotary files represents a major leap in the development ofendodontic instruments, with a wide variety of sophisticated instruments presentlyavailable (1, 2).Whatever their modification or improvement, all of these instruments have onething in common: they consist of a metal core with some type of rotating blade thatmachines the canal with a circular motion using flutes to carry the dentin chips anddebris coronally. Consequently, all rotary NiTi files will machine the root canal to acylindrical bore with a circular cross-section if the clinician applies them in a strictboring manner

The Analysis of Proprioception Alteration during First Five Months after Anterior Cruciate Ligament Reconstruction

2018 ◽  
Vol 1 (84) ◽  
Author(s):  
Vilma Jurevičienė ◽  
Albertas Skurvydas ◽  
Juozas Belickas ◽  
Giedra Bušmanienė ◽  
Dovilė Kielė ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Angular Velocity ◽  
Knee Joint ◽  
Cruciate Ligament ◽  
Position Sense ◽  
Joint Position Sense ◽  
Joint Position ◽  
Starting Position ◽  
Angular Velocities ◽  
Anterior Cruciate

Research  background  and  hypothesis.  Proprioception  is  important  in  the  prevention  of  injuries  as  reduced proprioception  is  one  of  the  factors  contributing  to  injury  in  the  knee  joint,  particularly  the  ACL.  Therefore, proprioception appears not only important for the prevention of ACL injuries, but also for regaining full function after ACL reconstruction.Research aim. The aim of this study was to understand how proprioception is recovered four and five months after anterior cruciate ligament (ACL) reconstruction.Research methods. The study included 15 male subjects (age – 33.7 ± 2.49 years) who had undergone unilateral ACL reconstruction with a semitendinosus/gracilis (STG) graft in Kaunas Clinical Hospital. For proprioceptive assessment, joint position sense (JPS) was measured on both legs using an isokinetic dynamometer (Biodex), at knee flexion of 60° and 70°, and at different knee angular velocities of 2°/s and 10°/s. The patients were assessed preoperatively and after 4 and 5 months, postoperatively.Research results. Our study has shown that the JPS’s (joint position sense) error scores  to a controlled active movement is significantly higher in injured ACL-deficient knee than in the contralateral knee (normal knee) before surgery and after four and five months of rehabilitation.  After 4 and 5 months of rehabilitation we found significantly lower values in injured knees compared to the preoperative data. Our study has shown that in injured knee active angle reproduction errors after 4 and 5 months of rehabilitation were higher compared with the ones of the uninjured knee. Proprioceptive ability on the both legs was  independent of all differences angles for target and starting position for movement. The knee joint position sense on both legs depends upon the rate of two different angular velocities and the mean active angle reproduction errors at the test of angular velocity slow speed was the highest compared with the fast angular velocity. Discussion and conclusions. In conclusion, our study shows that there was improvement in mean JPS 4 and 5 months after ACL reconstruction, but it did not return to normal indices.Keywords: knee joint, joint position sense, angular velocity, starting position for movement.

Effect of Inner and Outer Wheels Driving Force Control on Small Electric Vehicle

2020 ◽  
Vol 17 (4) ◽  
pp. 8246-8254
Author(s):  
K. Shibazaki ◽  
H. Nozaki
Keyword(s):  
Control System ◽  
Angular Velocity ◽  
Electric Vehicle ◽  
Force Constant ◽  
Force Control ◽  
Driving Force ◽  
Vehicle Control ◽  
Steering Angle ◽  
Force Control System ◽  
The Difference

In this study, in order to improve steering stability during turning, we devised an inner and outer wheel driving force control system that is based on the steering angle and steering angular velocity, and verified its effectiveness via running tests. In the driving force control system based on steering angle, the inner wheel driving force is weakened in proportion to the steering angle during a turn, and the difference in driving force is applied to the inner and outer wheels by strengthening the outer wheel driving force. In the driving force control (based on steering angular velocity), the value obtained by multiplying the driving force constant and the steering angular velocity,  that differentiates the driver steering input during turning output as the driving force of the inner and outer wheels. By controlling the driving force of the inner and outer wheels, it reduces the maximum steering angle by 40 deg and it became possible to improve the cornering marginal performance and improve the steering stability at the J-turn. In the pylon slalom it reduces the maximum steering angle by 45 deg and it became possible to improve the responsiveness of the vehicle. Control by steering angle is effective during steady turning, while control by steering angular velocity is effective during sharp turning. The inner and outer wheel driving force control are expected to further improve steering stability.

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