Results 31 to 40 of about 7,317,302 (267)

The minimal seed of turbulent transition in the boundary layer [PDF]

, 2011
This paper describes a scenario of transition from laminar to turbulent flow in a spatially developing boundary layer over a flat plate. The base flow is the Blasius non-parallel flow solution; it is perturbed by optimal disturbances yielding the largest
DE PALMA, Pietro, CHERUBINI, Stefania, ROBINET, Jean-Christophe, J.-C. Robinet, BOTTARO, Alessandro, A. Bottaro, J. C. Robinet, S. Cherubini, P. De Palma   +8 more
core   +1 more source

Photo‐Switchable Molecular Module Programming PET Biodegradation in Aquatic Environments

Advanced Functional Materials, EarlyView.
We address the plastic durability paradox by integrating an itaconic acid–derived pyrrolidone module into polymer backbones. Sunlight in water triggers Norrish Type I ring‐opening and hydrophilization, enabling rapid biodegradation into nontoxic minerals.
Mohammad Asif Ali, Jixin Zheng, Satoshi Wakai, Jie Liu, Hidetaka Nomaki, Misato Tsukatani, Noriyuki Isobe, Jingcheng Sang, Yuriko Aoki, Hideo Okamura, Daisuke Sasaki, Chiaki Ogino, Yuzo Yamazaki, Takashi Nishikaze, Kenji Takada, Maiko K. Okajima, Tatsuo Kaneko   +16 more
wiley   +1 more source

Analysis of particle size on mass dependent attenuation capability of bulk and nanoparticle PbO radiation shields

Results in Physics, 2021
This study aims to evaluate the effect of particle size on the mass dependent attenuation ability of bulk and nanoparticles PbO. The mass attenuation coefficient, or MAC, of the samples was experimentally calculated using the HPGe detector at various ...
M. Elsafi, M.I. Sayyed, Aljawhara H. Almuqrin, M.M. Gouda, A.M. El-khatib   +4 more
doaj   +1 more source

To BPE or not to BPE: neutron tenth-value layers in polyethylene with variable boron content for LINAC shielding

Journal of Radiological Protection
Abstract Borated polyethylene (PE) is an effective neutron moderator and absorber in medical linear accelerator shielding; however, there is limited data regarding the required material thickness for adequate neutron attenuation.
M Bellamy, A Jinia, L Carter, B Quinn, A Pérez-Andújar, B Chu, L Dauer   +6 more
openaire   +2 more sources

An Adaptive Inhibitory WSe2 Transistor for Retinomorphic In‐Sensor Image Processing

Advanced Functional Materials, EarlyView.
Conventional retinomorphic devices typically require deliberate gate‐bias tuning for each illumination condition. In this paper, we demonstrate an adaptive inhibitory WSe2 transistor that uses photo‐induced regime shift between the subthreshold and accumulation modes to achieve decision‐free, intensity‐adaptive image processing within a single pixel ...
Juhwan Baek, Junhwa Oh, Hyeonjung Kim, Minsik Park, Haein Cho, Jin Young Park, Hyeonchang Son, Taeyun Kim, Sung‐Un An, Yamin Zhang, Hyeon‐Jin Shin, Seyong Oh, Dong‐Ho Kang   +12 more
wiley   +1 more source

Radiation shielding properties of polycarbonate/poly (methyle methacrylate) polymer blends comprising cobalt tin sulphide, zinc molybdate, and copper cobaltite oxide composites in photon beams [PDF]

Nuclear Technology and Radiation Protection
The present study focuses on the calculation of selected shielding parameters of polycarbonate/poly(methyl methacrylate), polycarbonate/poly (methyl methacrylate)/cobalt tin sulphide, polycarbonate/poly(methyl methacrylate)/zinc molybdate, and ...
Alsufyani Sultan J., Algethami Merfat, Barakat Mai M.E., Nouh Abdallah S., Nouh Samir A., Gouda Mona M.   +5 more
doaj   +1 more source

The influence of PbO and Bi2O3 on the radiation shielding and elastic features for different glasses

Journal of Materials Research and Technology, 2020
The radiation shielding effects and elastic properties of adding lead (Pb) and bismuth (Bi) to glasses was analyzed. Six different glasses, coded as G1-G6, were simulated with varying compositions of bismuth oxide and lead oxide, with G1 having the ...
Mohammed Abu Al Sayyed, Mohd Hafiz Mohd Zaid, Nuraidayanie Effendy, Khamirul Amin Matori, Hj Ab Aziz Sidek, Eloic Lacomme, Karim Al Mahmoud, Maha Mohammed AlShammari   +7 more
doaj   +1 more source

Large‐Scale Determination of Frontier Orbital Energies of Disordered Small‐Molecule Organic Semiconductors Using Exciplex Emission Spectra

Advanced Materials, EarlyView.
ABSTRACT Accurately knowing the frontier orbital energies of the structurally disordered small‐molecule organic semiconductors that are used in optoelectronic devices such as organic light‐emitting diodes is required to rationally improve their performance. Here, we show that these energies can be deduced with a large accuracy from the peak energies of
Christian B. McDonald, Hiroki Tomita, Giacomo Cotelli, Louka L. Brüll, Nanno G. de Rooij, Lucas R.L. Norg, Milo Clément, Reinder Coehoorn   +7 more
wiley   +1 more source

Development of a flexible composite based on vulcanized silicon casting with bismuth oxide and characterization of its radiation shielding effectiveness in diagnostic X-ray energy range and medium gamma-ray energies

Nuclear Engineering and Technology
The study aims to develop a novel, lead-free, flexible and lightweight composite shielding material against ionizing radiation. For this, it was used bismuth oxide (Bi2O3) in RTV-2 silicon matrix. The shielding tests were carried out in both diagnostic X-
İbrahim Demirel, Haluk Yücel
doaj   +1 more source

Gamma-ray and Neutron Shielding Capacity of Glasses with Various Energies and (_ ^241)Am-Be Source [PDF]

Progress in Physics of Applied Materials
In this research, we have investigated features of the ionizing radiation shielding of glasses, , in the photon energy of 15 keV to 15 MeV. We have calculated mass attenuation coefficient (MAC) by using the Monte Carlo simulations such as Geant4 tool ...
H. Hosseini Sarteshnizi, M. Eshghi
doaj   +1 more source