scholarly journals LED Lens for Rectangular Beam with Small Divergence Angles

2016 ◽  
Vol 20 (6) ◽  
pp. 739-744 ◽  
Author(s):  
Dianhong Liu ◽  
Xiaohui Zhang ◽  
Shuang Zhang
Keyword(s):  
Rectangular Beam

A 5 x 40 cm rectangular-beam multipole ion source

1981 ◽  
Author(s):  
R. ROBINSON ◽  
H. KAUFMAN ◽  
C. HAYNES
Keyword(s):  
Ion Source ◽  
Rectangular Beam

Study of rectangular beam folded waveguide traveling-wave tube for terahertz radiation

2017 ◽  
Vol 24 (10) ◽  
pp. 103132 ◽  
Author(s):  
Fengying Lu ◽  
Changqing Zhang ◽  
Manfred Grieser ◽  
Yong Wang ◽  
Suye Lü ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
Traveling Wave ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Folded Waveguide ◽  
Rectangular Beam

scholarly journals Tuning of Turbine Blades: A Theoretical Approach

1982 ◽  
Author(s):  
P. Gudmundson
Keyword(s):  
Perturbation Method ◽  
Turbine Blade ◽  
Theoretical Approach ◽  
Turbine Blades ◽  
Rectangular Beam ◽  
Resonance Frequencies ◽  
Geometrical Change

A perturbation method is described which predicts the changes in eigenfrequencies resulting from geometrical changes of a structure. This dependence is represented by dimensionless functions, one for each eigenfrequency, which vary over the surface of the structure. The functions are presented for each eigenfrequency as isoline plots. An easily estimated integration of these functions allows one to predict a geometrical change which results in a desired change in the resonance frequencies. The method was applied to a turbine blade and a rectangular beam. For the turbine blade isoline plots are presented for the first five eigenfrequencies. Eigenfrequency changes up to 8 percent were modeled accurately.

Exact analysis of wave propagation in an infinite rectangular beam

2004 ◽  
Vol 25 (7) ◽  
pp. 768-778 ◽  
Author(s):  
Sun Wei-ming ◽  
Yang Guang-song ◽  
Li Dong-xu
Keyword(s):  
Wave Propagation ◽  
Exact Analysis ◽  
Rectangular Beam

scholarly journals Investigation of a New Strengthening Technique for RC Deep Beams Using Carbon FRP Ropes as Transverse Reinforcements

Fibers ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 52 ◽  
Author(s):  
Constantin Chalioris ◽  
Parthena-Maria Kosmidou ◽  
Nikos Papadopoulos
Keyword(s):  
Shear Failure ◽  
Structural Behaviour ◽  
Deep Beams ◽  
Near Surface ◽  
Lap Splices ◽  
Rectangular Beam ◽  
Rc Deep Beams ◽  
Carbon Fibre Reinforced Polymer ◽  
Strengthening Technique ◽  
The Web

The effectiveness of a new retrofitting technique to upgrade the structural behaviour of reinforced concrete (RC) deep beams without steel stirrups using carbon fibre-reinforced polymer (CFRP) ropes as the only transverse shear reinforcement is experimentally investigated. Five shear-critical beams with rectangular and T-shaped cross-section are tested under monotonic loading. The strengthening schemes include (a) one vertical and one diagonal single-link CFRP rope that are internally applied through the web of the rectangular beam using an embedded through-section (ETS) system and (b) two vertical U-shaped double-link ropes that are applied around the perimeter of the web of the flanged beam using a near-surface-mounted (NSM) system. In both cases, the free lengths of the CFRP ropes have been properly anchored using epoxy bonded lap splices of the rope as NSM at (a) the top and the bottom of the web of the rectangular beam and (b) the top of the slab of the T-beam. Promising results have been derived, since the proposed strengthening technique enhanced the strength and altered the brittle shear failure to a ductile flexural one. The experimental results of this study were also used to check the validity of an analytical approach to predict the strength of shear strengthened deep beams using FRP ropes as transverse link reinforcement.

Wave flows induced by lifting of a rectangular beam partly immersed in shallow water

2017 ◽  
Vol 816 ◽  
pp. 442-467 ◽  
Author(s):  
Vladimir V. Ostapenko ◽  
Olyana A. Kovyrkina
Keyword(s):  
Shallow Water ◽  
Liquid Flow ◽  
Beam Width ◽  
Lower Surface ◽  
Water Medium ◽  
Second Stage ◽  
Rectangular Beam ◽  
Third Stage ◽  
Channel Bottom ◽  
Long Wave Approximation

Flows induced by vertical lifting of a rectangular beam partly immersed into shallow water in a rectangular prismatic channel with a horizontal bottom are studied within the framework of the long-wave approximation. The beam width coincides with the channel width and the lower and upper planes of the beam are parallel to the channel bottom. The lifting process in the general case consists of three stages. At the first stage, the lower surface of the beam is completely located in the liquid, which ascends following the beam under the action of hydrostatic pressure. At the second stage, the edges of the lower surface of the beam leave the water medium, the wetted part of the beam becomes smaller, and the liquid under this part of the beam move upward. At the beginning of the third stage, the beam is separated from water; as a result, liquid lifting that occurred at the second stage leads to the formation of two diverging waves. The liquid flow in the domain adjacent to the lower surface of the beam is calculated analytically, while the liquid flow outside this domain is obtained by means of numerical calculations by the CABARET (compact accurately boundary-adjusting high-resolution technique) scheme, which provides the second order of accuracy on smooth solutions.

Mode analysis of Photonic-Crystal Surface-Emitting Lasers and the generation of rectangular beam

2021 ◽  
Author(s):  
Lih-Ren Chen ◽  
Kuo-Bin Hong ◽  
Wei-Chih Weng ◽  
Bing-Hong Chuang ◽  
Tien-Chang Lu
Keyword(s):  
Photonic Crystal ◽  
Crystal Surface ◽  
Mode Analysis ◽  
Rectangular Beam ◽  
Surface Emitting Lasers ◽  
Emitting Lasers

scholarly journals Diffraction of a rectangular beam by a crack edge

1986 ◽  
Vol 80 (S1) ◽  
pp. S105-S105
Author(s):  
John G. Harris
Keyword(s):  
Crack Edge ◽  
Rectangular Beam
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