scholarly journals Small-scale shear: Peeling off diffuse subhalos with gravitational waves

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Han Gil Choi ◽  
Chanung Park ◽  
Sunghoon Jung
Keyword(s):  
Gravitational Waves ◽  
Small Scale ◽  
Peeling Off ◽  
Scale Shear

Characteristics of small-scale shear layers in a temporally evolving turbulent planar jet

2021 ◽  
Vol 920 ◽  
Author(s):  
Masato Hayashi ◽  
Tomoaki Watanabe ◽  
Koji Nagata
Keyword(s):  
Shear Layers ◽  
Small Scale ◽  
Planar Jet ◽  
Scale Shear

Abstract

On Primordial Black Holes and secondary gravitational waves generated from inflation with solo/multi-bumpy potential

2021 ◽  
Author(s):  
Rui feng Zheng ◽  
Jia ming Shi ◽  
Taotao Qiu
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Waves ◽  
Power Spectra ◽  
Small Scale ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Slow Roll ◽  
Spherical Collapse ◽  
Scalar Perturbations

Abstract It is well known that primordial black hole (PBH) can be generated in inflation process of the early universe, especially when the inflaton field has some non-trivial features that could break the slow-roll condition. In this paper, we investigate a toy model of inflation with bumpy potential, which has one or several bumps. We found that potential with multi-bump can give rise to power spectra with multi peaks in small-scale region, which can in turn predict the generation of primordial black holes in various mass ranges. We also consider the two possibilities of PBH formation by spherical collapse and elliptical collapse. And discusses the scalar-induced gravitational waves (SIGWs) generated by the second-order scalar perturbations.

scholarly journals Small-scale shear effects on heterocystous cyanobacteria

2002 ◽  
Vol 47 (1) ◽  
pp. 108-119 ◽  
Author(s):  
Pia H. Moisander ◽  
James L. Hench ◽  
Kaisa Kononen ◽  
Hans W. Paerl
Keyword(s):  
Small Scale ◽  
Heterocystous Cyanobacteria ◽  
Shear Effects ◽  
Scale Shear

Study of turbulent structure with hot wires smaller than the viscous length

1984 ◽  
Vol 142 ◽  
pp. 121-149 ◽  
Author(s):  
William W. Willmarth ◽  
Lalit K. Sharma
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Velocity Gradient ◽  
Shear Layers ◽  
Small Scale ◽  
Wall Region ◽  
Burst Frequency ◽  
Velocity Fluctuations ◽  
Hot Wires ◽  
Scale Shear

The small-scale structure of the streamwise velocity fluctuations in the wall region of a turbulent boundary layer is examined in a new wind-tunnel facility using hot-wires smaller than any previously constructed (typical dimensions: l = 25 μm, d = 0.5 μm). In the boundary layer in which the measurements were made, the ratio of the hot-wire length to the viscous length is 0.3. The turbulent intensity measured with the small hot wires is larger than that measured with longer wires owing to the better spatial resolution of the small wires. The velocity fluctuations measured by the small hot wires are also analysed to determine the burst frequency at two Reynolds numbers and at various distances from the wall. The dimensionless burst frequency does not depend on the Reynolds number when scaled with wall parameters. However, it increases with Reynolds number when scaled with outer variables. Velocity fluctuations measured by two hot wires, less than two viscous lengths apart, are analysed to reveal the small-scale features present during a burst and in the absence of a burst. The main conclusions are: (1) intermittent small-scale shear layers occur most frequently when bursts are present, less frequently just after a burst, and even less frequently just before a burst; and (2) on occasion the velocity gradient of the small-scale shear layers is as large as the mean-velocity gradient at the wall.

scholarly journals Test Arrangement of Small-scale Shear Tests of Composite Slabs

2016 ◽  
Vol 161 ◽  
pp. 716-721 ◽  
Author(s):  
Josef Holomek ◽  
Miroslav Bajera ◽  
Martin Vilda
Keyword(s):  
Small Scale ◽  
Shear Tests ◽  
Composite Slabs ◽  
Scale Shear

scholarly journals Enhancement of Small-scale Turbulent Dynamo by Large-scale Shear

2017 ◽  
Vol 850 (1) ◽  
pp. L8 ◽  
Author(s):  
Nishant K. Singh ◽  
Igor Rogachevskii ◽  
Axel Brandenburg
Keyword(s):  
Large Scale ◽  
Small Scale ◽  
Turbulent Dynamo ◽  
Scale Shear

Effect of small-scale shear on grazing and growth of the dinoflagellate Pfiesteria piscicida

Harmful Algae ◽  
2006 ◽  
Vol 5 (4) ◽  
pp. 407-418 ◽  
Author(s):  
Diane K. Stoecker ◽  
Amy Long ◽  
Steven E. Suttles ◽  
Lawrence P. Sanford
Keyword(s):  
Small Scale ◽  
Pfiesteria Piscicida ◽  
Scale Shear

Small-scale shear connectors in HSC/UHPC

2016 ◽  
Author(s):  
Martin Classen ◽  
Martin Herbrand ◽  
Alexander Stark ◽  
Josef Hegger
Keyword(s):  
Small Scale ◽  
Shear Connectors ◽  
Scale Shear

Shear Tests of Composite Slabs, Experimental and Numerical Investigation

2014 ◽  
Vol 923 ◽  
pp. 217-220 ◽  
Author(s):  
Josef Holomek ◽  
Miroslav Bajer ◽  
Jan Barnat ◽  
Martin Vild
Keyword(s):  
Large Scale ◽  
Small Scale ◽  
Concrete Slabs ◽  
Shear Tests ◽  
Composite Action ◽  
Permanent Formwork ◽  
Composite Slabs ◽  
New Type ◽  
Large Scale Tests ◽  
Scale Shear

Composite slab is being used for horizontal structures. The sheeting can serve as a permanent formwork and no additional reinforcement can be required. The slabs are then fast and easy assemble construction which can be effectively used in reconstructions. One of the meanings to assure composite action of composite steel-concrete slabs is prepressed embossments. Its main disadvantage is that the design of a new type of sheeting requires expensive and time consuming large-scale laboratory testing which hamper its widespread commercial usage. Small-scale shear tests present a less expensive alternative to the large-scale tests but its results cannot be simply used for the design of the whole slab. The results from small-scale tests with different options are compared in this paper. Also a possibility of contribution of FE simulation results to the small-scale tests usage is investigated.

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