scholarly journals Practically perfect pentagonal prism

2009 ◽  
Author(s):  
Neil Withers
Keyword(s):  
Pentagonal Prism

scholarly journals Polyhedra Self-Assembled from DNA Tripods and Characterized with 3D DNA-PAINT

Science ◽  
2014 ◽  
Vol 344 (6179) ◽  
pp. 65-69 ◽  
Author(s):  
Ryosuke Iinuma ◽  
Yonggang Ke ◽  
Ralf Jungmann ◽  
Thomas Schlichthaerle ◽  
Johannes B. Woehrstein ◽  
...  
Keyword(s):  
Self Assembly ◽  
Fluorescent Microscopy ◽  
Three Dimensional ◽  
Super Resolution ◽  
Triangular Prism ◽  
Hexagonal Prism ◽  
General Strategy ◽  
Transmission Electron ◽  
Pentagonal Prism ◽  
Means Of Transmission

DNA self-assembly has produced diverse synthetic three-dimensional polyhedra. These structures typically have a molecular weight no greater than 5 megadaltons. We report a simple, general strategy for one-step self-assembly of wireframe DNA polyhedra that are more massive than most previous structures. A stiff three-arm-junction DNA origami tile motif with precisely controlled angles and arm lengths was used for hierarchical assembly of polyhedra. We experimentally constructed a tetrahedron (20 megadaltons), a triangular prism (30 megadaltons), a cube (40 megadaltons), a pentagonal prism (50 megadaltons), and a hexagonal prism (60 megadaltons) with edge widths of 100 nanometers. The structures were visualized by means of transmission electron microscopy and three-dimensional DNA-PAINT super-resolution fluorescent microscopy of single molecules in solution.

A slow motion device for the wild pentagonal prism

1976 ◽  
Vol 28 (3) ◽  
pp. 147-148
Author(s):  
D. M. Jenkins
Keyword(s):  
Slow Motion ◽  
Pentagonal Prism

1×2 optical switch using new type of pentagonal prism

1980 ◽  
Vol 16 (7) ◽  
pp. 257 ◽  
Author(s):  
Ryuichi Watanabe ◽  
Koichi Asatani
Keyword(s):  
Optical Switch ◽  
Pentagonal Prism ◽  
New Type

scholarly journals Infrared detection of (H2O)20 isomers of exceptional stability: a drop-like and a face-sharing pentagonal prism cluster

2014 ◽  
Vol 16 (48) ◽  
pp. 26691-26696 ◽  
Author(s):  
Christoph C. Pradzynski ◽  
Christoph W. Dierking ◽  
Florian Zurheide ◽  
Richard M. Forck ◽  
Udo Buck ◽  
...  
Keyword(s):  
Infrared Detection ◽  
Pentagonal Prism ◽  
Exceptional Stability

The exceptionally stable isomers A and B of (H2O)20 have been detected by their characteristic OH stretch absorption patterns.

Optical Design of Endoscopic Telecentric Measuring Apparatus

2013 ◽  
Vol 552 ◽  
pp. 325-328
Author(s):  
Qiong Wu ◽  
Yang Xiang ◽  
Bin Yang ◽  
Qian Song ◽  
Li Jie Hou ◽  
...  
Keyword(s):  
Surface Defects ◽  
Optical Design ◽  
Mirror Image ◽  
Depth Of Field ◽  
Modulation Transfer ◽  
Master Cylinder ◽  
Precision Measuring ◽  
Pentagonal Prism ◽  
Airy Disk ◽  
To Receive

Endoscopic telecentric apparatus is a precision measuring instrument which consists of optical, mechanical and electrical technologies. It can be applied in real-time accurate test to detect the position, shape and wall surface defects of brake master cylinder. This paper designed an optical system with Zemax, it can be used in endoscopic telecentric apparatus. The system has 4mm linear field of view, the line of vision is 90°,the magnification is 0.75×,the depth of field is 6mm.The value of modulation transfer function (MTF) is close to the diffraction limit, the resolution of the system is up to 3 and the spot diagrams of all configurations are smaller than Airy disk, the total track is less than 300mm. It adopts 1/6CCD to receive image, the measurement accuracy reaches to 0.03mm.The system uses pentagonal prism to realize 90°line of vision, it is convenient to assemble and avoids the mirror image. The image quality is good and the design meets the requirement.

scholarly journals Constitutive Model of Stress-Dependent Seepage in Columnar Jointed Rock Mass

Symmetry ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 160 ◽  
Author(s):  
Zihao Niu ◽  
Zhende Zhu ◽  
Xiangcheng Que
Keyword(s):  
Rock Mass ◽  
Constitutive Model ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Hexagonal Prism ◽  
Columnar Jointed Rock Mass ◽  
Pentagonal Prism ◽  
Permeability Anisotropy ◽  
Simulation Results ◽  
Prism Model

Columnar jointed rock mass (CJRM) is a highly symmetrical natural fractured structure. As the rock mass of the dam foundation of the Baihetan Hydropower Station, the study of its permeability anisotropy is of great significance to engineering safety. Based on the theory of composite mechanics and Goodman’s joint superposition principle, the constitutive model of joints of CJRM is derived according to the Quadrangular prism, the Pentagonal prism and the Hexagonal prism model; combined with Singh’s research results on intermittent joint stress concentration, considering column deflection angles, the joint constitutive model of CJRM in three-dimensional space is established. For the CJRM in the Baihetan dam site area, the Quadrangular prism, the Pentagonal prism and the Hexagonal prism constitutive models were used to calculate the permeability coefficients of CJRM under different deflection angles. The permeability anisotropy characteristics of the three models were compared and verified by numerical simulation results. The results show that the calculation results of the Pentagonal prism model are in good agreement with the numerical simulation results. The variation of permeability coefficient under different confining pressures is compared, and the relationship between permeability coefficient and confining pressure is obtained, which accords with the negative exponential function and conforms to the general rule of joint seepage.

Untethered soft robotic matter with passive control of shape morphing and propulsion

2019 ◽  
Vol 4 (33) ◽  
pp. eaax7044 ◽  
Author(s):  
Arda Kotikian ◽  
Connor McMahan ◽  
Emily C. Davidson ◽  
Jalilah M. Muhammad ◽  
Robert D. Weeks ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Passive Control ◽  
Integrated Design ◽  
Liquid Crystal Elastomer ◽  
Shape Morphing ◽  
On Demand ◽  
Pentagonal Prism ◽  
External Stimuli ◽  
Thermal Stimuli ◽  
Bending Response

There is growing interest in creating untethered soft robotic matter that can repeatedly shape-morph and self-propel in response to external stimuli. Toward this goal, we printed soft robotic matter composed of liquid crystal elastomer (LCE) bilayers with orthogonal director alignment and different nematic-to-isotropic transition temperatures (TNI) to form active hinges that interconnect polymeric tiles. When heated above their respective actuation temperatures, the printed LCE hinges exhibit a large, reversible bending response. Their actuation response is programmed by varying their chemistry and printed architecture. Through an integrated design and additive manufacturing approach, we created passively controlled, untethered soft robotic matter that adopts task-specific configurations on demand, including a self-twisting origami polyhedron that exhibits three stable configurations and a “rollbot” that assembles into a pentagonal prism and self-rolls in programmed responses to thermal stimuli.

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