Topic
Transverse plane
About: Transverse plane is a research topic. Over the lifetime, 17069 publications have been published within this topic receiving 194059 citations. The topic is also known as: axial plane.
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TL;DR: In this paper, the authors used the multi-wavelength data from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) spacecraft to study a jet occurring in a coronal hole near the northern pole of the Sun.
Abstract: Using the multi-wavelength data from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) spacecraft, we study a jet occurring in a coronal hole near the northern pole of the Sun. The jet presented distinct upward helical motion during ejection. By tracking six identified moving features (MFs) in the jet, we found that the plasma moved at an approximately constant speed along the jet's axis. Meanwhile, the MFs made a circular motion in the plane transverse to the axis. Inferred from linear and trigonometric fittings to the axial and transverse heights of the six tracks, the mean values of the axial velocities, transverse velocities, angular speeds, rotation periods, and rotation radii of the jet are 114 km s-1, 136 km s-1, 0.81° s-1, 452 s and 9.8 × 103 km respectively. As the MFs rose, the jet width at the corresponding height increased. For the first time, we derived the height variation of the longitudinal magnetic field strength in the jet from the assumption of magnetic flux conservation. Our results indicate that at heights of 1 × 104 ~ 7 × 104 km from the base of the jet, the flux density in the jet decreases from about 15 to 3 G as a function of B = 0.5(R/R⊙ − 1)−0.84 (G). A comparison was made with other results in previous studies.
51 citations
TL;DR: A new approach is discussed that, starting from near-field and far-field intensity measurements, can evaluate the complex excitation coefficients of the transverse modes in a laser beam.
Abstract: A quantitative measurement of laser-beam quality can be performed by determination of the presence of multiple transverse modes of the laser oscillator and by calculation of their power content. Along this line of argument, we discuss a new approach that, starting from near-field and far-field intensity measurements, can evaluate the complex excitation coefficients of the transverse modes in a laser beam. The exploitation of near-field measurements sharply improves the performances of the technique in those cases in which only far-field measurements are used. The validity of the method is confirmed by several accurate numerical simulations and by some experimental results relative to a multimode Q-switched Nd:YAG laser.
51 citations
TL;DR: In this paper, an accurate variational treatment of the diffraction of TE and TM waves by an abrupt transverse discontinuity in a dielectric waveguide, such as the mirror of a double heterostructure (d.h.) injection laser, or the end plane of an antenna for millimeter waves, under the assumption of small aspect ratio was presented.
Abstract: This paper presents an accurate variational treatment of the diffraction of TE and TM waves by an abrupt transverse discontinuity in a dielectric waveguide, such as the mirror of a double heterostructure (d.h.) injection laser, or the end plane of a dielectric slab antenna for millimeter waves, under the assumption of small aspect ratio. A matrix representation of the Green's function is derived analytically, in the limit of small efective frequency, for the TE case. For the TM case, the complication introduced by the discontinuity of the transverse electric field across the dielectric interface is discussed in detail. The numerical examples refer to the d.h. laser configuration. Both transverse directions (perpendicular as well as parallel) to the junction are studied. The effect of mode coupling at the mirror of a LOC laser as well as the effect of an antireflection coating are investigated.
51 citations
Patent•
17 Jun 2003
TL;DR: In this article, a mechanism for articulating the distal end of an elongated tool through movement of drums, in which wires coupled to the drums connect the mechanism to the tool that is being articulated, is described.
Abstract: A mechanism for articulating the distal end of an elongated tool through movement of drums, in which wires coupled to the drums connect the mechanism to the distal end of the tool that is being articulated. The mechanism comprises a joystick coupled to a rotatable shaft that is coupled to one of the drums. When the joystick is moved in one direction, the shaft is rotated, thereby rotating the drum and causing articulation in one plane. There is an arc arm rotatable by movement of the joystick. The arc arm rotates about an axis that is transverse to the shaft rotational axis. Rotation of the arc arm is accomplished by movement of the joystick in a plane that is transverse to the plane in which the joystick is moved to cause rotation of the first rotatable shaft. A gear system translates rotation of the arc arm to rotation of the second drum, to cause articulation in an articulation plane that is perpendicular to the articulation plane caused by rotation of the first drum. The result is an intuitive mechanical connection between the joystick and the articulating head that is simple to use and provides direct mechanical feedback from the articulating head to the user's hand.
51 citations
TL;DR: In this paper, a sextic approach to plane waves in infinite (visco)elastic plates of arbitrary anisotropy and transverse inhomogeneity is outlined.
51 citations