Results 51 to 60 of about 776 (192)

Coherent Stokes Raman Scattering for Simultaneous Measurement of CO2 and CH4 Temperatures

Journal of Raman Spectroscopy, EarlyView.
A three‐beam hybrid fs/ps CSRS method is employed to excite the rovibrational transitions in the Fermi‐dyad of CO2$$ {}_2 $$ and the v2$$ {v}_2 $$ mode of CH4$$ {}_4 $$. Time‐domain spectroscopic models are developed to extract the fuel and flame temperature profiles from experimental CH4$$ {}_4 $$ and CO2$$ {}_2 $$ spectra in a diffusion flame ...
Alexander M. Warner, Robert P. Lucht, Rohan M. Gejji, Carson D. Slabaugh   +3 more
wiley   +1 more source

Deformation and failure mechanism of flat-nosed TC4 titanium alloy projectile penetrating steel target at different velocities

Materials & Design
The dynamic behavior of flat-nosed Ti-6Al-4V (TC4) alloy projectiles penetrating Q235 steel targets under three velocities (800 m/s, 983 m/s, and 1167 m/s) was studied experimentally and numerically, emphasizing the evolution of adiabatic shear bands of ...
Yue Zhou, Xinxin Zhao, Longlong Wang, Wenbo Zhuang, Xiaohui Sun, Mingshi Wang, Zhe Chu   +6 more
doaj   +1 more source

DynaTOF: Time‐Resolved Noncontrast Cerebral MR Angiography Using Spatially Modulated RF Saturation

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop a time‐resolved extension of three‐dimensional time‐of‐flight MR angiography, termed Dynamic TOF (DynaTOF), that exploits intrinsic RF saturation behavior to enable noncontrast visualization of cerebrovascular hemodynamics.
Naoyuki Takei, Keita Fujii, Xucheng Zhu, Yuichi Suzuki, Satoru Miyawaki, Motoyuki Umekawa, Satoshi Koizumi, Tetsuya Wakayama, Shiori Amemiya, Osamu Abe   +9 more
wiley   +1 more source

Improving dynamic mechanical properties and inhibiting adiabatic shear bands of the molybdenum single crystal by adding Nb element

Journal of Materials Research and Technology
The adiabatic shear band is a common dynamic failure mechanism in metal materials at high strain rates. In this work, a new approach was proposed to improve mechanical properties and inhibit the formation and propagation of the adiabatic shear band in ...
Zhenchuan Li, Benqi Jiao, Weiwei Zhang, Wen Zhang, Jianfeng Li   +4 more
doaj   +1 more source

Synthesis and Characterization of an Azido Nitrofurazanyl Ether: An Energy‐Rich Heterocyclic Plasticizer With a Low Glass Transition Temperature

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT We report on the synthesis and characterization of 3‐(2‐(2‐azidoethoxy)ethoxy)‐4‐nitro‐1,2,5‐oxadiazole (NFPEG2N3), which is a liquid nitrofurazanyl ether that was designed to be an energy‐rich plasticizer for glycidyl azide polymer (GAP)‐ and nitrocellulose (NC)‐based formulations.
P. Lieber, A. Omlor, U. Schaller, T. M. Klapötke   +3 more
wiley   +1 more source

Numerical simulation of systems of shear bands in ductile metal with inclusions

AIP Advances, 2016
We develop a method for numerical simulations of high strain-rate loading of mesoscale samples of ductile metal with inclusions. Because of its small-scale inhomogeneity, the composite material is prone to localized shear deformation (adiabatic shear ...
JeeYeon N. Plohr, Bradley J. Plohr
doaj   +1 more source

Microstructural observations on the terminal penetration of long rod projectile

Defence Technology, 2017
Present study focuses on the terminal penetration of tungsten heavy alloy (WHA) long rod penetrator impacted against armour steel at an impact velocity of 1600 m/s.
Krushna Kumbhar, P. Ponguru Senthil, A.K. Gogia   +2 more
doaj   +1 more source

Phenomenon of transformed adiabatic shear band surrounded by deformed adiabatic shear band of ductile metal

Transactions of Nonferrous Metals Society of China, 2008
Abstract The coexistent phenomenon of deformed and transformed adiabatic shear bands(ASBs) of ductile metal was analyzed using the JOHNSON-COOK model and gradient-dependent plasticity(GDP). The effects of melting point, density, heat capacity and work to heat conversion factor were investigated.
openaire   +1 more source

Characterization of synoptic environment for mesoscale convective systems over South Korea using ERA5 reanalysis data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
In this study, the synoptic conditions for modes of mesoscale convective systems (MCSs) in South Korea are generalized based on composite analysis. The preferred precipitation region, synoptic patterns, moisture transport, sea surface temperature and thermodynamic and dynamic instabilities are characterized according to four modes: convective cells (CC)
Jeong‐Eun Lee, GyuWon Lee
wiley   +1 more source

Characterization of the dynamic behaviour of ALGOTUF armour steel during impact and in torsion

EPJ Web of Conferences, 2015
Algotuf is a new steel which is proposed as a candidate for armour material. To assess this application, a study of the impact properties of this steel was conducted at the University of Manitoba using two types of Hopkinson Bar systems, namely a ...
Bassim Nabil, Boakye-Yiadom Solomon, Toussaint Genevieve, Bolduc and Manon   +3 more
doaj   +1 more source