Results 61 to 70 of about 11,150 (222)

Index to 1984 NASA Tech Briefs, volume 9, numbers 1-4 [PDF]

, 1987
Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage ...

core   +1 more source

Actuation Strategies for Underwater Jet‐Propelled Soft Robots

Journal of Field Robotics, EarlyView.
ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone, Mohammed Anteet, Pawandeep S. Matharu, Yara Almubarak   +3 more
wiley   +1 more source

In situ X-ray imaging of melt pool dynamics in underwater arc welding

Materials & Design, 2019
The dynamic behavior of the underwater melt pool was firstly in-situ observed with the X-ray transmission method. A method for quantitatively characterizing the melt pool stability was pioneered.
Changsheng Xu, Ning Guo, Xin Zhang, Haiyue Jiang, Hao Chen, Jicai Feng   +5 more
doaj   +1 more source

Менеджмент остаточных напряжений в сварных элементах и конструкциях [PDF]

, 2015
Residual stresses introduced before, during or after welding may change considerably the engineering properties of materials and structural components by affecting their fatigue life, distortion, dimensional stability, corrosion resistance, etc.
Kleiman, Jacob, Kudryavtsev, Yuri, Клейман, Я. И., Кудрявцев, Ю. Ф.   +3 more
core  

Analyses of the Deformability and Chemistry of Non‐Metallic Inclusions in QT Steels With Increased Recycling‐Induced Tramp Element Content

steel research international, EarlyView.
This work uses high‐temperature dilatometry to examine how the tramp elements Cu, Ni, and Sn affect the deformability of non‐metallic inclusions and matrix in quench‐and‐temper steel. Mg‐bearing inclusions deform less than Mg‐free ones. Copper lowers formability. Nickel increases deformability.
Julian Cejka, Isabell Gruber, Gerald Klösch, Susanne Katharina Michelic   +3 more
wiley   +1 more source

Insights into the structure of grey reef shark aggregation, Carcharhinus amblyrhynchos (Bleeker, 1856), in two distinct channels of the Maldivian archipelago, Indian Ocean

Journal of Fish Biology, EarlyView.
Abstract The grey reef shark Carcharhinus amblyrhynchos is one of the most frequently encountered reef‐associated shark species in the Maldives, yet very little is known about its local size structure or population dynamics. This study provides new insights into two aggregations of C.
Andrea Parmegiani, Jacopo Gobbato, Rilwan Yoosuf, Davide Seveso, Paolo Galli, Andrew Darren Whitehead, Yameen Ismail, Simone Montano   +7 more
wiley   +1 more source

Comparative Analysis of Shielded Metal Arc Welding (SMAW) Beads in Dry and Wet Environments

Yanbu Journal of Engineering and Science
Shielded Metal Arc Welding (SMAW) is a versatile and reliable welding process widely used across various industries. The environment in which SMAW is performed can significantly impact the characteristics of the weld bead, influencing factors such as ...
Abdullah F. Alhuzaim
doaj   +1 more source

Development of VTOL-configured unmanned aquatic vehicle for underwater welding applications: An innovative design and multi-perspective computational investigations

Results in Engineering
Underwater welding is a challenging and intricate technique. An Unmanned Underwater Vehicle (UUV) has been specifically created for this task. This study encompasses all the calculations and computational techniques related to both the basic UUV and the ...
Janani Priyadharshini Veeraperumal Senthil Nathan, Manikandan Arumugam, Mahendran Rajendran, Laxana Sourirajan, Gopinath Vinayagam, Akhila Ajith Pisharam, Sundhar Baskar, Beena Stanislaus Arputharaj, Subhav Singh, Khristina Maksudovna Vafaeva, Vijayanandh Raja   +10 more
doaj   +1 more source

Mountain‐top spherules: Criteria to identify natural and synthetic particles

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are important tracers of geologic and environmental processes in modern and ancient deposits. However, anthropogenic contamination can dilute natural collections by releasing synthetic microspherules into the environment.
M. R. Boyd, M. J. Genge
wiley   +1 more source

Centroid variability model–based control of HITUWV for automatic underwater welding with enhanced stability and accuracy

Advances in Mechanical Engineering, 2019
This article presents a centroid variability model–based controller of HITUWV (Underwater Welding Vehicle by Harbin Institute of Technology), an underwater welding vehicle, for automatic welding with high stability and accuracy.
Yang Luo, Jianguo Tao, Zhuang Hao, Hao Sun, Zhandong Li, Haibo Gao, Liang Ding, Zongquan Deng   +7 more
doaj   +1 more source