On the Mechanism of Ring-Shape Structure of Plasma Bullet

2014 ◽  
Vol 11 (12) ◽  
pp. 1169-1174 ◽  
Author(s):  
YuBin Xian ◽  
YuanFu Yue ◽  
DaWei Liu ◽  
Yong Yang ◽  
XinPei Lu ◽  
...  
Keyword(s):  
Ring Shape ◽  
Shape Structure

A ring of grids: a giant spin-crossover cluster

2021 ◽  
Author(s):  
Takuya Shiga ◽  
Minami Tachibana ◽  
Hajime Sagayama ◽  
Reiji Kumai ◽  
Graham N. Newton ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Ring Shape ◽  
Shape Structure ◽  
Spin Crossover Complexes

II20 Mononuclear and icosanuclear spin-crossover complexes, [Fe] and [Fe20], were synthesized. [Fe] has a bis-chelate structure, while [Fe20] has a ring-shape structure comprising four [2 × 2] grid moieties and four mononuclear units.

scholarly journals A Novel Microwave Coaxial Slot Antenna for Liver Tumor Ablation

2014 ◽  
Vol 3 (1) ◽  
pp. 20 ◽  
Author(s):  
H. Acikgoz ◽  
İ. Turer
Keyword(s):  
Liver Cancer ◽  
Liver Tumor ◽  
Coaxial Line ◽  
Tumor Ablation ◽  
Slot Antenna ◽  
Ring Shape ◽  
Outer Conductor ◽  
Shape Structure

This paper is on the effect of a T-ring shape structure to enhance the capability of a microwave coaxial slot antenna (MCA) in the treatment of liver cancer. The MCA is composed of an interstitial coaxial line that is enclosed in a catheter. The T-ring shape structure is wrapped on the outer conductor of the MCA. Thanks to the new structure, the backward heating problem appearing in many coaxial antennas is reduced and the generated heat in front of the slot is higher than those for a classical MCA.

scholarly journals Research on the Mechanisms of Internal Gear Honing by use of Cone-shape Honing Wheel with Tool Tilt Angle

2021 ◽  
Author(s):  
Zheng Guo ◽  
Yan Li ◽  
Wen-Chao Guo ◽  
Wu-Gang Zhang ◽  
Feng Gao ◽  
...  
Keyword(s):  
Tilt Angle ◽  
Ring Gear ◽  
Gear Honing ◽  
Ring Shape ◽  
Shape Structure ◽  
Tooth Surfaces ◽  
New Type ◽  
Tool Tilt Angle ◽  
Internal Gear ◽  
The Mathematical Model

Abstract Ring gear is an important transmission component, but restricted by its ring-shape structure, the tooth surfaces are pretty hard to be finished after heat treatment. Honing is the most commonly used finishing technique for external gear, but for ring gear, it is inconvenient. In this paper, a new type of cone-shape honing wheel is proposed and the honing mechanism is studied for improving the honing performance of ring gear. First of all, the mathematical model of the honing technology by use of cone-shape honing wheel is built, and the merits of the new honing method are discussed. Then, the contact conditions between the honing wheel and the work gear are analyzed, and it is found that the tool tilt angle of the honing wheel has good influences on the honing mark distribution of the work gear. Finally, the honing simulations for ring gear by use of cone-shape honing wheel are carried out, by which the feasibility of the new honing technique are verified.

Coherent electron nanodiffraction from clean silver nano particles in a UHV STEM

1993 ◽  
Vol 51 ◽  
pp. 1058-1059
Author(s):  
J. Liu ◽  
M. Pan ◽  
G. E. Spinnler
Keyword(s):  
Supported Catalysts ◽  
Imaging Techniques ◽  
Nano Particles ◽  
Metal Particles ◽  
Shape Structure ◽  
Dynamical Simulations ◽  
Small Metal Particles ◽  
Extract Information

Small metal particles have peculiar chemical and physical properties as compared to bulk materials. They are especially important in catalysis since metal particles are common constituents of supported catalysts. The structural characterization of small particles is of primary importance for the understanding of structure-catalytic activity relationships. The shape and size of metal particles larger than approximately 5 nm in diameter can be determined by several imaging techniques. It is difficult, however, to deduce the shape of smaller metal particles. Coherent electron nanodiffraction (CEND) patterns from nano particles contain information about the particle size, shape, structure and defects etc. As part of an on-going program of STEM characterization of supported catalysts we report some preliminary results of CEND study of Ag nano particles, deposited in situ in a UHV STEM instrument, and compare the experimental results with full dynamical simulations in order to extract information about the shape of Ag nano particles.

scholarly journals Donut-Shaped mmWave Printed Antenna Array for 5G Technology

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1415
Author(s):  
Mian Muhammad Kamal ◽  
Shouyi Yang ◽  
Saad Hassan Kiani ◽  
Muhammad Rizwan Anjum ◽  
Mohammad Alibakhshikenari ◽  
...  
Keyword(s):  
Antenna Array ◽  
Ground Plane ◽  
Single Element ◽  
Total Efficiency ◽  
Printed Antenna ◽  
Central Frequency ◽  
Ring Shape ◽  
Dual Beam ◽  
High Bandwidth ◽  
Slotted Antenna

This article presents compact and novel shape ring-slotted antenna array operating at mmWave band on central frequency of 28 GHz. The proposed structure designed at 0.256 mm thin Roggers 5880 is composed of a ring shape patch with a square slot etched at the top mid-section of partial ground plane. Through optimizing the ring and square slot parameters, a high bandwidth of 8 GHz is achieved, ranging from 26 to 32 GHz, with a simulated gain of 3.95 dBi and total efficiency of 96% for a single element. The proposed structure is further transformed in a 4-element linear array manner. With compact dimensions of 20 mm × 22 mm for array, the proposed antenna delivers a high simulated gain of 10.7 dBi and is designed in such a way that it exhibits dual beam response over the entire band of interest and simulated results agree with fabricated prototype measurements.

Effect of chain-penetration on ring shape for mixtures of rings and linear polymers

Polymer ◽  
2021 ◽  
Vol 218 ◽  
pp. 123493
Author(s):  
Katsumi Hagita ◽  
Takahiro Murashima
Keyword(s):  
Linear Polymers ◽  
Ring Shape

Milling Curves Influence in Ring Rolling Processes

2014 ◽  
Vol 622-623 ◽  
pp. 956-963 ◽  
Author(s):  
Luca Giorleo ◽  
Elisabetta Ceretti ◽  
Claudio Giardini
Keyword(s):  
Numerical Approach ◽  
The Other ◽  
Ring Rolling ◽  
Roll Speed ◽  
Forming Process ◽  
Industrial Case Study ◽  
Industrial Environment ◽  
Ring Shape ◽  
Deformation Processes

Ring Rolling is a complex hot forming process used for the production of shaped rings, seamless and axis symmetrical workpieces. The main advantage of workpieces produced by ring rolling, compared to other technological processes, is given by the size and orientation of grains, especially on the worked surface which give to the final product excellent mechanical properties. In this process different rolls (Idle, Axial, Guide and Driver) are involved in generating the desired ring shape. Since each roll is characterized by a speed law that can be set independently by the speed law imposed to the other rolls, an optimization is more critical compared with other deformation processes. Usually, in industrial environment, a milling curve is introduced in order to correlate the Idle and Axial roll displacement, however it must be underlined that different milling curves lead to different loads and energy for ring realization. In this work an industrial case study was modeled by a numerical approach: different milling curves characterized by different Idle and Axial roll speed laws (linearly decreasing, constant, linearly increasing) were designed and simulated. The results were compared in order to identify the best milling curve that guarantees a good quality ring (higher diameter, lower fishtail) with lower loads and energy required for manufacturing.

Thermal/frictional performance of spiral pipe with ring-shape depression used as in-pond heat exchanger

Solar Energy ◽  
2021 ◽  
Vol 224 ◽  
pp. 742-756
Author(s):  
Yan Cao ◽  
Hamdi Ayed ◽  
Mehran Hashemian ◽  
Alibek Issakhov ◽  
Makatar Wae-hayee
Keyword(s):  
Heat Exchanger ◽  
Ring Shape ◽  
Frictional Performance

Numerical Simulation of Ring-Shape Rock Failure under Compressive Loading

2011 ◽  
Vol 378-379 ◽  
pp. 15-18
Author(s):  
Yong Bin Zhang ◽  
Zheng Zhao Liang ◽  
Shi Bin Tang ◽  
Jing Hui Jia
Keyword(s):  
Numerical Simulation ◽  
Fracture Process ◽  
Failure Modes ◽  
Failure Process ◽  
Compressive Loading ◽  
Orientation Angle ◽  
Crack Orientation ◽  
Ring Specimen ◽  
Ring Shape ◽  
Good Agreement

In this paper, a ring shaped numerical specimen is used to studying the failure process in brittle materials. The ring specimen is subjected to a compressive diametral load and contains two angled central cracks. Numerical modeling in this study is performed. It is shown that the obtained numerical results are in a very good agreement with the experiments. Effect of the crack orientation angle on the failure modes and loading-displace responses is discussed. In the range of 0°~40°, the fracture paths are curvilinear forms starting from the tip of pre-existing cracks and grow towards the loading points. For the crack orientation angle 90°, vertical fractures will split the specimen and the horizontal cracks do not influence the fracture process.

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