Results 61 to 70 of about 47,584 (240)

Longitudinal distribution of extreme pressures in a hydraulic jump downstream of a stepped spillway

RBRH, 2017
The overflow system of a dam safely controls the water level of a reservoir. The design of these structures should predict the damage caused by the action of the turbulent flow to which they are subject to.
Carolina Kuhn Novakoski, Roberta Ferrão Hampe, Eliane Conterato, Marcelo Giulian Marques, Eder Daniel Teixeira   +4 more
doaj   +1 more source

Energy Dissipation in Stepped Spillways with Different Horizontal Face Angles

, 2019
Energy dissipation is one of the most important factors in choosing stepped spillways. However, very few studies have investigated energy dissipation with different horizontal face angles.
Chunhang Xie, Yongqin Peng, Xujin Zhang, Xia Li, Zhaoliang Bai, Hao Yuan, Shuqing Yang   +6 more
core   +1 more source

Recent Advances in Laser‐Induced Graphene‐Based Gas Sensors: From Sensing Mechanisms to Biomedical Applications

Advanced Science, EarlyView.
Laser‐induced graphene (LIG) provides a scalable, laser‐direct‐written route to porous graphene architecture with tunable chemistry and defect density. Through heterojunction engineering, catalytic functionalization, and intrinsic self‐heating, LIG achieves highly sensitive and selective detection of NOX, NH3, H2, and humidity, supporting next ...
Md Abu Sayeed Biswas, Ankan Dutta, Shuvendu Das, Abu Musa Abdullah, Wanqing Zhang, Fatema Tuz Zohra, Huanyu Cheng   +6 more
wiley   +1 more source

Energy Dissipation down a Stepped Spillway with Nonuniform Step Heights [PDF]

Journal of Hydraulic Engineering, 2011
Although most stepped spillway–design guidelines were developed for uniform step heights, a nonuniform stepped design might be a practical alternative in some cases. A physical study was conducted in a moderate slope-stepped chute (1V:2H) and five stepped configurations were tested for 0.7 < dc / h < 1.9.
Felder, Stefan, Chanson, Hubert
openaire   +3 more sources

Air entrainment and energy dissipation on porous pooled stepped spillways [PDF]

, 2013
The hydraulics of stepped spillways with flat steps is well documented and some design guidelines exist for typical embankment dam slopes. On the other hand, alternative stepped designs are poorly understood.
Chanson, Hubert, Chanson, H., Felder, S., Felder, Stefan   +3 more
core  

Stochastic Entanglement of Deterministic Origami Tentacles For Robust Robotic Grasping

Advanced Science, EarlyView.
This study introduces an origami tentacle gripper to robustly grasp objects‐in air, underwater, and even in orbital space‐by exploiting a synergy between local, deterministic deformation programming and global, stochastic entanglements. A single origami tentacle can be designed to coil with a simple tendon pull.
Alec Boron, Bokun Zheng, Ziyang Zhou, Noel Naughton, Suyi Li   +4 more
wiley   +1 more source

Strong Metal‐Support Interaction Driven Janus Reconstruction in PtRu Alloys for Low‐Temperature Hydrogen Storage

Advanced Science, EarlyView.
Strong metal‐support interactions (SMSI) drive the spontaneous segregation of RuPt alloy into Janus nanoparticles on CeO2, spatially partitioning Pt‐rich domains for H2 dissociation and Ru‐rich domains for toluene adsorption. This Janus nanocatalysts yield a turnover frequency of 10 906 h−1 for toluene hydrogenation at 50 °C, which is 6.7 times that of
Xingyu Zhang, Haiqiang Bai, Wenbin Li, You Wang, Yunhua Xu, Sai Zhang   +5 more
wiley   +1 more source

Microfluidic Gratings for X‐Ray Phase Contrast Imaging

Advanced Science, EarlyView.
This work establishes a new protocol for the fabrication of X‐ray gratings that exploits the advantages of microfluidics and enables a more inexpensive, faster, and scalable production process. These X‐ray devices are fundamental for implementing X‐ray phase contrast imaging (XPCI) in laboratory and clinical settings, yet their costly and complex ...
Alessandro Rossi, Antonio Ferraro, Francesco Coccimiglio, Tiziana Ritacco, Alberto Astolfo, Michele Giocondo, Vincenzo Formoso, Raffaele Giuseppe Agostino, Francesco Iacoviello, Ioannis Papakonstantinou, Alessandro Olivo   +10 more
wiley   +1 more source

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

RBRH, 2020
The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial ...
Lucas Camargo da Silva Tassinari, Daniela Guzzon Sanagiotto, Marcelo Giulian Marques, Luísa Lüdtke Lauffer, Edgar Fernando Trierweiler Neto   +4 more
doaj   +1 more source

Interfacial Tandem Catalysis Over a CuSn(OH)6/Co Heterostructure Enables Efficient Electroreduction of Nitrate to Ammonia

Advanced Science, EarlyView.
Interfacial tandem catalysis is developed for efficient electrochemical reduction of NO3− to NH3 over a CuSn(OH)6/Co heterostructure. CuSn(OH)6 accelerates the rate‐determining NO3−‐to‐*NO2 conversion, whereas Co promotes H2O dissociation to enhance *H supply for the rapid hydrogenation of *NO2 intermediate to NH3.
Yuan‐Yuan Hei, Qing Chen, Jie Gu, Yifan Leng, Yaping Huang, Sunhui Chen, Hong Sun, Hongfang Du   +7 more
wiley   +1 more source