Results 81 to 90 of about 107,029 (283)

Effects of underwater explosion bubble on shock environment of warship

Zhongguo Jianchuan Yanjiu, 2018
[Objectives] In order to standardize the load system of a hull's shock environment and study the effects of bubble pulsation pressure on a hull's shock environment, [Methods] acoustic-structure coupling methods are used to simulate a hull subjected to a ...
ZENG Lingyu, CAI Shang, WANG Shiping
doaj   +1 more source

THE PSEUDO VELOCITY SHOCK RESPONSE SPECTRUM Revision A

, 2010
The Shock Response Spectrum (SRS) models the peak response of a single-degree-offreedom (SDOF) system to a base acceleration, where the system's natural frequency is an independent variable. The SRS method is thoroughly covered in Reference 1.
Tom Irvine
core  

Shock Response of a Nonlinear System

, 1962
The dynamic response of a nonlinear, single-degree-of-freedom spring-mass system to shock loading is investigated. A specific value of the maximum deflection is chosen as a characteristic quantity called the “maximum allowable deflection”—which forms the
M. V. Barton, Y. C. Fung
core   +1 more source

E. coli Extracellular Matrix: A Tunable Composite With Hierarchical Structure

Advanced Materials, EarlyView.
The complex composite‐like mechanical behavior of E. coli biofilm matrix is the result of a synergic contribution of the rigid curli and swelling pEtN‐cellulose, and emerges from specific ratio and assembly conditions. The interactions between the two fibers govern biofilm hydration and characteristic wrinkling patterns, providing crucial insights for ...
Macarena Siri, Agustín Mangiarotti, Anne Seewald, Nikolai Rosenthal, Shahrouz Amini, Emeline Raguin, Peter Fratzl, Cécile M. Bidan   +7 more
wiley   +1 more source

Response spectrum-based analysis of airborne radar random vibration and multi-point control improvement

Scientific Reports
During the flight of a UAV (unmanned aerial vehicle), the LiDAR device undergoes random vibrations due to the changing flight attitude and wind speed conditions of the UAV. It is important to control the frequency and amplitude of the vibrations within a
Jie Liu, Zezheng Liu, Wanqian Chen, Jing Lv, Zixuan Jiang, Jiahao Pang, Libin Du   +6 more
doaj   +1 more source

Transient Laser‐Shocked Synthesis of Amorphous Layer‐Supported Metal Nanocrystals for Efficient Nitrate Reduction

Advanced Materials, EarlyView.
A general, versatile laser‐shock synthesis process is reported to produce various bimetallic CuNi, CuFe, CuCo, and medium‐entropy CuFeCoNi heterostructures, in which crystalline metal nanoparticles are anchored to amorphous hydroxide supports. During nitrate reduction reaction, the heterostructures undergo dynamic amorphous/crystalline reconstruction ...
Weihua Guo, Jixun Zhang, Siwei Zhang, Yangbo Ma, Yun Song, Jianjun Su, Zihao Li, Yinger Xin, Qiang Zhang, Mingming He, Ruixuan Wang, Rui Xue, Shibo Xi, Ying Wang, Shenlong Zhao, Tao Yang, Zhengxiao Guo, Ben Zhong Tang, Ruquan Ye   +18 more
wiley   +1 more source

Analysis of unobservable residual vibration characteristics in sampled-data control systems using first-order holds

Nihon Kikai Gakkai ronbunshu
In this study, we examined the effects of introducing a First-Order Hold (FOH) on the “unobservable residual vibrations caused by mechanical resonances near the sampling frequency” in sampled-data control systems. We compared three types of holds used in
Shigeyuki NAKADAI, Takenori ATSUMI
doaj   +1 more source

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

A New Method to Synthesize a Shock Response Spectrum Compatible Base Acceleration to Improve Multi-Degree of Freedom System Response [PDF]

, 2015
University of Minnesota Ph.D. dissertation. 2015. Major: Mechanical Engineering. Advisor: Susan Mantell. 1 computer file (PDF); x, 98 pages.A new method has been developed to synthesize a shock response spectrum (SRS) compatible base acceleration with ...
Alexander, Joseph
core  

Flexible Chemiresistive Chitosan‐Glycerol Sensors on Laser‐Induced Graphene Electrodes for Room‐Temperature Ammonia Detection

Advanced Materials Technologies, EarlyView.
Flexible Chitosan‐glycerol sensor integrated with porous laser‐induced graphene (LIG) electrodes enable room‐temperature chemiresistive detection of ammonia (NH3) and proof‐of‐concept detection of fish spoilage. ABSTRACT We report a metal‐free sensor platform combining laser induced graphene (LIG) electrodes with drop‐deposited, glycerol‐plasticized ...
Mintesinot Tamiru Mengistu, Richard Murray, Cara‐Lena Nies, Cathal Larrigy, Martina Piletti, Jahidul Islam, Daniela Iacopino, Eileen Hurley, Michael Nolan, Aidan J. Quinn   +9 more
wiley   +1 more source