Results 81 to 90 of about 493,714 (288)

HESS J1809-193: Gamma-Ray Emission by Cosmic Rays from a Past Explosion

The Astrophysical Journal
The very-high-energy γ -ray source HESS J1809-193 has been detected by the LHAASO and HAWC observatory beyond 100 TeV energy. It is an interesting candidate for exploring the underlying mechanisms of γ -ray production due to the presence of supernova ...
Sovan Boxi, Nayantara Gupta
doaj   +1 more source

تقييم كفاءة مادة النانوماجنتك في تنظيف الاسطح الجدارية الملونة [PDF]

مجلة کلية الآداب. جامعة أسوان
الصور الجدارية تحتاج الي اختيار طريقة واسلوب التنظيف والعلاج المناسبين وان كل صورة جدارية لها حالتها الخاصة في طريقة التعامل معها. يهدف البحث الي تقييم كفاءة مادة النانوماجنتك لتنظيف اسطح الصور الجدارية لذا استعانت الدراسة العديد من اجهزة الفحص والتحليل.
احمد محمد سلام حسن
doaj   +1 more source

Rapid Microwave Plasma Engineering of HfO2/C@C Core‐Shell Fibrous Membrane Toward Flexible High‐Performance Electromagnetic Wave Absorption

Advanced Functional Materials, EarlyView.
Rapid microwave plasma torch engineering tunes crystal phases, carbon graphitization and oxygen‐vacancy defects in HfO2/C@C core‐shell fibrous membranes. Synergistic multi‐loss effects optimize impedance matching to deliver −65.75 dB reflection loss and a 7.37 GHz effective bandwidth for flexible electromagnetic wave absorption.
Qichao Ding, Limeng Song, Wei Li, Jiangtao Hao, Xuewen Jiang, Mengru Li, Xinglai Yuan, Gang Wang, Yanqiu Zhu, Mi Tian, Hailong Wang, Hongxia Li, Biao Zhao, Rui Zhang, Bingbing Fan   +14 more
wiley   +1 more source

Intriguing Nature of AM Her–type Candidate CXOU J204734.8+300105

The Astrophysical Journal
The detection and characterization of periodic X-ray signals are crucial for identifying new compact objects and studying the mechanisms powering their emission.
Rahul Sharma, Chetana Jain, Biswajit Paul, Anjan Dutta, Vikram Rana   +4 more
doaj   +1 more source

Electron‐Deficient Linkers Enhance H2O2 Electrosynthesis in Covalent Organic Frameworks

Advanced Functional Materials, EarlyView.
Linker π‐conjugation modulates the electronic state of the Ni–N4 centers and their interaction with the key *OOH intermediate while preserving the primary coordination motif. NiPc‐PTDA delivers an H2O2 selectivity of 92% and a production rate of 34.8 mol gcat−1 h−1, highlighting linker electronic properties as a molecular design parameter for NiPc ...
Houting Xie, Rui Guo, Zhen Liu, Yang Hu, Laichun Zhao, Omid Mazaheri, Bufeng Zhang, Shuaijun Pan   +7 more
wiley   +1 more source

Silicon Raman polarizer

Optics Letters, 2012
We theoretically investigate the polarization properties of Raman amplifiers based on silicon-on-insulator waveguides, and show that it is possible to realize a waveguide Raman polarizer. The Raman polarizer is a special type of Raman amplifier with the property of producing an amplified and highly repolarized beam when it is fed by a relatively weak ...
KOZLOV, Victor, WABNITZ, Stefan
openaire   +4 more sources

Architecture‐Driven Functional Coupling in Vertically Aligned Nanocomposites

Advanced Functional Materials, EarlyView.
Vertically aligned nanocomposites define a growth‐engineered architecture in which vertical interfaces, strain fields, defect pathways, and phase connectivity are created simultaneously. This review shows how these architectural features couple ferroic, optical, ionic, electrochemical, and device responses, establishing design rules and open challenges
Md Shatil Islam‐Shanto, Javier Zamudio‐García, Abraham Sánchez‐Caballero, David Marrero‐López, Vincenzo Esposito   +4 more
wiley   +1 more source

Current trends of characterization techniques for PVDF and related composite piezoelectric materials for nanogenerator

Discover Polymers
Piezoelectric polymers, especially Polyvinylidene fluoride (PVDF), prized for flexibility, chemical inertness, and ease of fabrication, are emerging as prime energy harvesters to power microelectronics and wearables.
Sakti Prasanna Muduli, Loree Lipsa, Sabyasachi Parida   +2 more
doaj   +1 more source

Decoupling the Size and Loading Effects in Silver Nanoparticles for Efficient Paired Carbon Dioxide and Formaldehyde Electrolysis

Advanced Functional Materials, EarlyView.
We investigate size‐dependent CO selectivity on Ag nanoparticles, where optimized Ag loading achieves nearly 100% Faradaic Efficiency for CO at −100 mA·cm−2. In situ SERS and XPS reveal the crucial role of optimized loading in catalytic performance. The Ag/C catalyst further exhibits bifunctional activity, enabling efficient electrolysis of CO2 and ...
Venkata S. R. K. Tandava, Clara Große, Debabrata Bagchi, Zhenye Zhu, Suptish Ghosh, J. Niklas Hausmann, Carsten Walter, Rosario Suarez Anzorena, Catalina Elena Jimenez, Yasmin Lucero Cobos‐Becerra, Jack C. Q. Fletcher, Tobias Sontheimer, Michael Schwarze, Holger Dau, Matthias Driess, Marcus Bär, Prashanth W. Menezes   +16 more
wiley   +1 more source

Differentiation of Lipsticks by Raman Spectroscopy [PDF]

, 2012
Dispersive Raman spectra have been obtained using a Raman microscope and an excitation wavelength of 632.8 nm from 69 lipsticks of various colours and from a range of manufacturers without any pre-treatment of the samples.
Salahioglu, Fatma, Went, Michael J.
core   +1 more source