Results 21 to 30 of about 18,738 (267)

First-principles analysis of the effects of oxygen, vacancies, and their complexes on the screw dislocation motion in body-centered cubic Nb

Journal of Materials Research and Technology
Some solute atoms induce strengthening and embrittlement in body-centered cubic refractory metals. Especially, interstitial oxygen produces remarkable strengthening effects in Nb, wherein the yield stress of oxygen-doped Nb alloys is more than twice that
Tomohito Tsuru, Ivan Lobzenko, Shigenobu Ogata, Wei-Zhong Han   +3 more
doaj   +1 more source

Vacancies and vacancy-oxygen complexes in silicon: Positron annihilation with core electrons [PDF]

Physical Review B, 1998
Various point defects in silicon are studied theoretically from the point view of positron annihilation spectroscopy. Properties of a positron trapped at a single vacancy, divacancy, vacancy-oxygen complexes $({\mathrm{VO}}_{n}),$ and divacancy-oxygen complex are investigated. In addition to the positron lifetime and positron binding energy to defects,
Kuriplach, Jan, Morales Aramburo, Álvaro Luis, Dauwe, Charles, Segers, Danny, Sob, M.   +4 more
openaire   +3 more sources

Role of Sr doping and external strain on relieving bottleneck of oxygen diffusion in La2−x Sr x CuO4−δ

Scientific Reports, 2022
In many complex oxides, the oxygen vacancy formation is a promising route to modify the material properties such as a superconductivity and an oxygen diffusivity.
Sohee Park, Young-Kyun Kwon, Mina Yoon, Changwon Park   +3 more
doaj   +1 more source

Roles of Oxygen Vacancies of CeO₂ and Mn-Doped CeO₂ with the Same Morphology in Benzene Catalytic Oxidation

Molecules, 2021
Mn-doped CeO2 and CeO2 with the same morphology (nanofiber and nanocube) have been synthesized through hydrothermal method. When applied to benzene oxidation, the catalytic performance of Mn-doped CeO2 is better than that of CeO2, due to the difference ...
Min Yang, Genli Shen, Qi Wang, Ke Deng, Mi Liu, Yunfa Chen, Yan Gong, Zhen Wang   +7 more
doaj   +1 more source

Femtosecond visualization of oxygen vacancies in metal oxides [PDF]

Science Advances, 2020
Femtosecond spectroscopy combined with first-principle calculations enables determination of oxygen-vacancy configuration.
Zhang, Xinping, Tang, Fawei, Wang, Meng, Zhan, Wangbin, Hu, Huaxin, Li, Yurong, Friend, Richard H, Song, Xiaoyan   +7 more
openaire   +2 more sources

Localized versus itinerant states created by multiple oxygen vacancies in SrTiO3

New Journal of Physics, 2015
Oxygen vacancies in strontium titanate surfaces (SrTiO _3 ) have been linked to the presence of a two-dimensional electron gas with unique behavior. We perform a detailed density functional theory study of the lattice and electronic structure of SrTiO _3
Harald O Jeschke, Juan Shen, Roser Valentí   +2 more
doaj   +1 more source

A novel quinazolinone insulin receptor inhibitor and its synergy with an EGFR inhibitor in glucose‐driven glioblastoma

Molecular Oncology, EarlyView.
The novel styrylquinazolinone‐based molecule W1B effectively suppresses glioblastoma by inhibiting IGF1R and EGFR. In high‐glucose microenvironments driving tumor resistance, W1B acts synergistically with the EGFR inhibitor dacomitinib. This combination safely blocks compensatory survival signaling in zebrafish xenograft models. Showcasing promising in
Patryk Rurka, Wioleta Cieślik, Wojciech Płaziński, Katarzyna Stępnik, Anna Boguszewska‐Czubara, Elżbieta Kot, Robert Musioł, Mateusz Jasica, Anna Mrozek‐Wilczkiewicz, Katarzyna Malarz   +9 more
wiley   +1 more source

Inverse change in positron lifetimes of vacancies in tungsten by binding of interstitial impurity atoms to a vacancy: A first-principles study

Nuclear Materials and Energy, 2023
First-principles calculations related to defect complexes formed from a monovacancy and multiple interstitial impurity atoms (hydrogen, carbon, nitrogen, and oxygen atoms) in tungsten were performed.
Atsushi Yabuuchi
doaj   +1 more source

Dose‐dependent hepatotoxicity of hydrogen peroxide in HepG2 cells and its modulation by CYP450 induction

FEBS Open Bio, EarlyView.
NMR metabolomics revealed concentration‐dependent metabolic perturbations in HepG2 cells exposed to H2O2. Rifampicin pretreatment enhanced metabolic competence, attenuated toxin‐induced alterations and produced metabolite profiles more consistent with human liver physiology, supporting the use of CYP450‐induced HepG2 models for improved in vitro ...
Maren Jinks, Garth L. Maker, Emily C. Davies, Berin A. Boughton, Samantha Lodge   +4 more
wiley   +1 more source

Ab initio study of oxygen vacancies in α-quartz [PDF]

Journal of Non-Crystalline Solids, 1997
Extrinsic levels, formation energies, and relaxation geometries are calculated ab initio for oxygen vacancies in alpha-quartz SiO2. The vacancy is found to be thermodynamically stable in the charge states Q=+3, Q=0, Q=--2, and Q=-3. The charged states are stabilized by large and asymmetric distortions near the vacancy site.
CARBONARO, CARLO MARIA, FIORENTINI, VINCENZO, Massidda S.   +2 more
openaire   +3 more sources