Results 81 to 90 of about 70,227 (292)

CO2 Reduction on Copper‐Nitrogen‐Doped Carbon Catalysts Tuned by Pulsed Potential Electrolysis: Effect of Pulse Potential

open access: yesAdvanced Functional Materials, EarlyView.
This study demonstrates that pulsed potential electrolysis significantly improves CO2 reduction performance on copper‐nitrogen doped carbon electrodes. The formation of cationic copper sites and metallic clusters as a function of applied intermittent potential leads to notable selectivity changes compared to potentiostatic reduction.
Dorottya Hursán   +13 more
wiley   +1 more source

Analysis Of Foundation And Fuselage Of Dams In Static And Quasi-Static By Using Numerical Models [PDF]

open access: yesمهندسی و مدیریت ساخت, 2016
Static and quasi-static analysis of soil dams in different stages of construction and operation is of great importance. In this research, the stability of the Ilam dam roof during the staged and quasi-static stages in horizontal earthquake accelerations ...
Masoud Fatahian   +2 more
doaj  

Boosting the Energy Density of “Anode‐Free” Lithium Metal Batteries via Electrospun Polymeric Scaffolds

open access: yesAdvanced Functional Materials, EarlyView.
While host structures are known to enhance the reversibility and safety of lithium metal deposition, their additional volume and weight often decrease the battery's energy density and specific energy. By combining a lightweight and porous scaffold of electrospun polymer with a thinner separator, this article demonstrates a simultaneous improvement of ...
Lennart Wichmann   +6 more
wiley   +1 more source

Encapsulating Zinc Powder in MXene/Silk Scaffolds with Zincophilic‐Hydrophobic Polymer for Flexible Zinc‐Ion Batteries

open access: yesAdvanced Functional Materials, EarlyView.
This work develops flexible zinc‐ion batteries (FZIBs) using a zincophilic/hydrophobic polymer (thermoplastic polycarbonate‐based polyurethane, TPCU) to protect Zn powder anodes and MXene/Silk (MXS) as flexible current collectors. The designed TPCU‐ZnP@MXS structure enables uniform Zn deposition, yielding dendrite‐free anodes with stable cycling ...
Zixuan Yang   +8 more
wiley   +1 more source

The margin of stability is affected differently when walking under quasi-random treadmill perturbations with or without full visual support [PDF]

open access: yesPeerJ
Background Sensory-motor perturbations have been widely used to assess astronauts’ balance in standing during pre-/post- spaceflight. However, balance control during walking, where most falls occur, was less studied in these astronauts.
Zhuo Wang, Haoyu Xie, Jung H. Chien
doaj   +2 more sources

Mechanical Properties of Architected Polymer Lattice Materials: A Comparative Study of Additive Manufacturing and CAD Using FEM and µ‐CT

open access: yesAdvanced Functional Materials, EarlyView.
This study examines how pore shape and manufacturing‐induced deviations affect the mechanical properties of 3D‐printed lattice materials with constant porosity. Combining µ‐CT analysis, FEM, and compression testing, the authors show that structural imperfections reduce stiffness and strength, while bulk material inhomogeneities probably enhance ...
Oliver Walker   +5 more
wiley   +1 more source

Stability Modeling and Parameter Analysis for Flexible DC Power Grids Under Asymmetric Conditions

open access: yesIEEE Access
When AC system operates asymmetrically, poor structure and control parameters of the converter station controller will have a negative impact on the stable operation of the flexible DC power grids. In this paper, a small-signal model of flexible DC power
Hui Li   +3 more
doaj   +1 more source

An Ulam stability result on quasi-b-metric-like spaces

open access: yesOpen Mathematics, 2016
In this paper a class of general type α-admissible contraction mappings on quasi-b-metric-like spaces are defined. Existence and uniqueness of fixed points for this class of mappings is discussed and the results are applied to Ulam stability problems ...
Alsulami Hamed H.   +3 more
doaj   +1 more source

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