Results 51 to 60 of about 2,057 (252)

On the natural lift curves for the involute spherical indicatrices in Minkowski 3-space

Malaya Journal of Matematik, 2017
This study presents some new conditions of being integral curve for the geodesic spray of the natural lift curves of the spherical indicatrices of the involutes of a given spacelike curve with a timelike binormal in Minkowski 3-space. Furthermore, depending on these conditions some interesting results about the spacelike evolute curve were obtained ...
null M. Bilici, null T.A. Ahmad
openaire   +1 more source

Tuning the Electronic Structure and Spin State of Fe─N─C Catalysts Using an Axial Oxygen Ligand and Fe Clusters for High‐Efficiency Rechargeable Zinc–Air Batteries

Advanced Functional Materials, EarlyView.
A FeN4─O/Clu@NC‐0.1Ac catalyst containing atomically‐dispersed FeN4─O sites (medium‐spin Fe2+) and Fe clusters delivered a half‐wave potential of 0.89 V for ORR and an overpotential of 330 mV at 10 mA cm−2 for OER in 0.1 m KOH. When the catalyst was used in a rechargeable Zn–air battery, a power density of 284.5 mW cm−2 was achieved with excellent ...
Yongfang Zhou, Yu Mao, Mengyao Chang, Ziyun Wang, Wenke Xie, Cuizhu Ye, Shanghai Wei, Lars Thomsen, Geoffrey I. N. Waterhouse   +8 more
wiley   +1 more source

SELECTED GEARS CUTTING METHODS DEVELOPMENT [PDF]

Scientific Journal of Silesian University of Technology. Series Transport, 2015
The paper presents a somewhat extended approach to the cutting tools classification. After that authors present results of the research concerning the form – grinding of spur gears with helical teeth.
Stanisław PŁONKA, Jan SZADKOWSKI, Józef MATUSZEK, Paweł KOBIELA   +3 more
doaj  

Extensive Review of Materials for Next‐Generation Transparent Batteries and Their Design Strategies

Advanced Functional Materials, EarlyView.
Review explores emerging materials and design strategies for transparent batteries, examining electrodes, electrolytes, separators, and device architectures optimized for high electrochemical performance, mechanical flexibility, and optical transparency.
Atul Kumar Mishra, Shuvaraj Ghosh, Malkeshkumar Patel, Sourov Hossain, Ju‐Hyung Yun, Joondong Kim   +5 more
wiley   +1 more source

Spatial analysis of contact deformation, stiffness, and flash temperature in involute gear pairs

Frontiers in Mechanical Engineering
Gear contact behavior significantly influences system vibration, wear, and transmission efficiency. Among the factors governing this, contact deformation, flash temperature, and meshing stiffness are particularly critical.
Hongtao Dong, Hongtao Dong, Yang Zhang, Lixin Xu   +3 more
doaj   +1 more source

The Effect of Purcell Cavities on the Lifetime of Thermally Activated Delayed Fluorescent Emitters

Advanced Functional Materials, EarlyView.
A pressing challenge to OLED displays and lighting is to balance high efficiency and long operational lifetime in the deep blue spectrum. The Purcell effect can reduce the triplet density and hence the probability for destructive energy‐driven triplet annihilation events that limit the OLED lifetime. Here we study of the Purcell effect on two different
Sritoma Paul, Haonan Zhao, Collin N. Muniz, Mark E. Thompson, Stephen R. Forrest   +4 more
wiley   +1 more source

Geometric Modeling and Fatigue Strength Simulation of Bevel Gears with Variable Radius Tooth Root

Jixie chuandong, 2022
Aiming at the problem that most of the teeth root of straight bevel gears adopt fixed radius fillet transition with 0.3 times of modulus， which tends to to cause large bending stress on the tooth root and reduce the service life of bevel gears， a design ...
Haohan Zeng, Huiming Sun, Tao Wang, Liangmo Wang, Hanguan Xia, Yi Dong   +5 more
doaj  

Praesphaerammina, a new genus of Cenozoic deep-water agglutinated foraminifera from the Carpathian flysch deposits [PDF]

, 2000
The genus Praesphaerammina Kaminski and Filipcscu is newly described based on a revision of the type species Cystammina subgaleata Vasicek 1947. The genus differs from the Holocene genus Sphaerammina Cushman 1910 emend.
Filipescu, S., Kaminski, M.A.
core  

Toward Scalable Solutions for Silver‐Based Gas Diffusion Electrode Fabrication for the Electrochemical Conversion of CO2 – A Perspective

Advanced Functional Materials, EarlyView.
In this study, the preparation techniques for silver‐based gas diffusion electrodes used for the electrochemical reduction of carbon dioxide (eCO2R) are systematically reviewed and compared with respect to their scalability. In addition, physics‐based and data‐driven modeling approaches are discussed, and a perspective is given on how modeling can aid ...
Simon Emken, K. Ashoke Raman, Alexander Bauer, Violeta Karyofylli, Eva Jodat, André Karl, Rüdiger‐A. Eichel   +6 more
wiley   +1 more source

用中心投影法作直齿圆锥齿轮的仿真模型

Jixie chuandong, 2010
In order to establish the straight bevel gear sketches and simulation model database,the straight bevel gear profile involute mathematical model is established,and a bevel gear tooth involute profile of the spherical projection formed into the circle ...
胡志勇, 张国兴, 刘海, 刘长增
doaj