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Review on natural hydrogen wells safety.
Nat Commun
January 2025
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China.
Hydrogen is a promising clean energy source with geological reserves widely distributed globally, offering an annual flow exceeding 23 trillion grams. However, natural hydrogen extraction wells face unique safety challenges compared to conventional oil and gas wells. This paper reviews well safety concerns such as tubing/casing damage, cement/sealant failure, and excessive annular pressure buildup.
View Article and Find Full Text PDFFabrication of photo-responsive self-deicing surface with micro-nano rough structures on fabrics.
J Colloid Interface Sci
December 2024
Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, PR China; Key Laboratory of Green Cleaning Technology & Detergent of Zhejiang Province, Lishui, Zhejiang 323000, PR China; Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, Zhejiang 312000, PR China.
Photothermal superhydrophobic treatment is an effective anti-icing and de-icing method, avoiding damage to equipment caused by ice accumulation in winter. However, the traditional photothermal materials were expensive and the photothermal conversion coatings are hard to remove when unnecessary. Herein, three biochar microspheres with solid, hollow, and flower-like structures (SBMs, HBMs, FBMs) were fabricated to construct photothermal superhydrophobic coatings on the polyester fabric (PET), respectively.
View Article and Find Full Text PDFRelaxation-optimized correlation spectroscopy ROCSY for assigning H or C spin systems in large proteins.
J Magn Reson
December 2024
Department of Medicine, University of Alberta, Canada; Department of Biochemistry, University of Alberta, Canada. Electronic address:
Solution NMR studies of large systems are hampered by rapid signal decay. We hereby introduce ROCSY (relaxation-optimized total correlation spectroscopy), which maximizes transfer efficiency across J-coupling-connected spin networks by minimizing the amount of time magnetization spends in the transverse plane. Hard pulses are substituted into the Clean-CITY TOCSY pulse element first developed by Ernst and co-workers, allowing for longer delays in which magnetization is aligned along the z-axis.
View Article and Find Full Text PDFEffect of Apical Preparation Size and Preparation Taper on Smear Layer Removal Using Two Different Irrigation Needles: A Scanning Electron Microscopy Study.
Eur J Dent
December 2024
Department of Endodontics, Faculty of Dental Medicine, Saint Joseph University of Beirut, Beirut, Lebanon.
Objectives: The aim of this study was to determine the effect of apical preparation size and preparation taper on smear layer removal using a metallic needle and a new polymer needle (IrriFlex, Produits Dentaires SA "PD," Vevey, Switzerland).
Materials And Methods: One hundred and eight single-rooted teeth with one canal were randomly divided into four groups according to the preparation and irrigation needle used: G1-30, 0.04 and IrriFlex ( = 25); G2-25, 0.
Unravelling the Mechanical and Superconducting Properties in Borophene with Multicentered Bonds.
J Phys Chem Lett
January 2025
State Key Laboratory of Superhard Materials, Key Laboratory of Material Simulation Methods & Software of Ministry of Education, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, China.
The multicentered bonds present in planar borophene lead to a more complex structure and richer chemical properties. Herein, we use first-principles calculations to investigate the electronic, mechanical, and superconducting properties of various borophene polymorphs, focusing on the newly synthesized β and β phases. Notably, in order to balance and optimize the electron filling of the valence bond orbitals, the planar borophene structure is composed of a mixture of triangular lattices and hexagonal holes with multicentered bonding, which further enhances the stability of the structure and possesses a rare polymorphic property.
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