Tobias Bomholt  Sara Larsson  Marianne Rix  Sarah Rytter  Bo Feldt‐Rasmussen  Mads Hornum  Carsten Lundby 《Hemodialysis international. International Symposium on Home Hemodialysis》2020,24(2):252-260

  相似文献   

    

Huaifang Zhang  Xiaoyu Qiu  Yifan Chen  Shangzhi Wang  Sara E. Skrabalak  Yawen Tang 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(6)

It is a great challenge to simultaneously control the size, morphology, and facets of monodispersed Pd nanocrystals under a sub‐5 nm regime. Meanwhile, quantitative understanding of the thermodynamic and kinetic parameters to maneuver the shape evolution of nanocrystals in a one‐pot system still deserves investigation. Herein, a systematic study of the density functional theory (DFT)‐calculated adsorption energy, thermodynamic factors, and reduction kinetics on Pd growth patterns is reported by combining theory and experiments, with a focus on the dispersed state of additives. As pure models, monodispersed Pd tetrahedrons enclosed by (111) facets with a narrow size distribution of 4.9 ± 1 nm and a high purity approaching 98% can be obtained when using 1,1′‐binaphthalene (C₂₀H₁₄) +2NH₃ as additives. Specifically, laciniate Pd nanourchins (Pd LUs) can evolve via anisotropic growth when replacing additive with dose‐consistent 1,1′‐binaphthyl‐2,2′‐diamine (C₂₀H₁₆N₂, two ? NH₂ binding in C₂₀H₁₄). Catalytic investigations show that the sub‐5 nm Pd tetrahedrons exhibit higher activity in both the oxygen reduction (E_onset = 1.025 V, E_1/2 = 0.864 V) and formic acid oxidation reaction with respect to the Pd LUs and Pd black, which represents a great step for the development of well‐defined Pd nanocrystals with size in the sub‐5 nm regime as non‐Pt electrocatalysts.  相似文献   

    

Sara Bergman  Mikael Asplund  Simin Nadjm‐Tehrani 《Concurrency and Computation》2020,32(12)

Blockchains are increasingly studied in the context of new applications. Permissioned blockchains promise to deal with the issue of complete removal of trust, a notion that is currently the hallmark of the developed society. Before the idea is adopted in contexts where resource efficiency and fast operation is a requirement, one could legitimately ask the question: can permissioned blockchains match the performance of traditional large‐scale databases? This paper compares two popular frameworks, Hyperledger Fabric and Apache Cassandra, as representatives of permissioned blockchains and distributed databases, respectively. We compare their latency for varying workloads and network sizes. The results show that, for small systems, blockchains can start to compete with traditional databases, but also that the difference in consistency models and differences in setup can have a large impact on the resulting performance.  相似文献   

    

Eric W. Frew  Brian Argrow  Steve Borenstein  Sara Swenson  C. Alexander Hirst  Henno Havenga  Adam Houston 《野外机器人技术杂志》2020,37(6):1077-1093

This paper presents the results of the design and field deployment of multiple autonomous fixed‐wing unmanned aircraft into supercell thunderstorms. As part of a field campaign in Spring 2019, up to three fixed‐wing unmanned aircraft were deployed simultaneously into different regions of supercell thunderstorms, To learn more about the atmospheric conditions that lead to the formation of tornadoes. Successful field deployment is attributed to (a) a nomadic concept of operations that allows the unmanned aircraft system team and science team to work seamlessly together while satisfying all aviation regulations and (b) the ruggedized RAAVEN unmanned aircraft system with modular features that favor rapid, ease‐of‐use over the brute strength of previous designs. The concept of operations and the unmanned aircraft system are described along with results from a 4 day window where four storms were sampled: two of these storms were tornadic (formed tornadoes before, during, or after being sampled) and two were not. These results validate the feasibility of nomadic operation of multiple unmanned aircraft simultaneously in severe weather conditions. Further, the successful field deployments demonstrate the importance of the modular unmanned aircraft design.  相似文献   

    

Masoumeh Faramarzi;Sara Shabgard;Vida Khalili;Duygu Ege; 《Microscopy research and technique》2024,87(7):1552-1565

Corrosion of dental implants is one of the most critical factors in the failure of implant treatments. Generally, corrosion depends on the type of material used in implants and the chemical composition of the oral environment. Due to the antibacterial activities, mouthwashes and chlorhexidine gels are often used after implant surgery. Ti6Al4V is commonly used in manufacturing dental implants. The present study aims to investigate the corrosion behavior of the Ti6Al4V alloy under different concentrations of chlorhexidine (0.12%, 0.2%,and 2%) during 2- and 24-h immersion. This way corrosion may be minimized while obtaining an antibacterial environment around the implant. In this regard, the electrochemical behavior of the specimens was investigated using polarization and impedance tests, and then their morphology, cross-section and nano-tribological behavior were evaluated using atomic force microscopy, scanning electron microscopy, energy dispersive x-ray spectroscopy, and nano-scratch test. The results show that using chlorhexidine solution with a concentration of 0.12% could yield a lower corrosion rate and material loss after implant surgery.  相似文献   

    

Fatma E. Hassan;Aliaa E. M. K. El-Mosallamy;Mohamed Mansour Khalifa;Samira H. Aljuaydi;Merhan E. Ali;Sara Adel Hosny;Nermeen Bastawy; 《Microscopy research and technique》2024,87(12):2929-2942

  相似文献   

    

Sara Pouladi  Monika Rathi  Devendra Khatiwada  Mojtaba Asadirad  Seung Kyu Oh  Pavel Dutta  Yao Yao  Ying Gao  Sicong Sun  Yongkuan Li  Shahab Shervin  Keon‐Hwa Lee  Venkat Selvamanickam  Jae‐Hyun Ryou 《Progress in Photovoltaics: Research and Applications》2019,27(1):i-i

  相似文献   

    

Leonardo Scarabelli  Marius Schumacher  Dorleta Jimenez de Aberasturi  Jan‐Philip Merkl  Malou Henriksen‐Lacey  Thais Milagres de Oliveira  Marcus Janschel  Christian Schmidtke  Sara Bals  Horst Weller  Luis M. Liz‐Marzn 《Advanced functional materials》2019,29(14)

The implementation of plasmonic nanoparticles in vivo remains hindered by important limitations such as biocompatibility, solubility in biological fluids, and physiological stability. A general and versatile protocol is presented, based on seeded emulsion polymerization, for the controlled encapsulation of gold and silver nanoparticles. This procedure enables the encapsulation of single nanoparticles as well as nanoparticle clusters inside a protecting polymer shell. Specifically, the efficient coating of nanoparticles of both metals is demonstrated, with final dimensions ranging between 50 and 200 nm, i.e., sizes of interest for bio‐applications. Such hybrid nanocomposites display extraordinary stability in high ionic strength and oxidizing environments, along with high cellular uptake, and low cytotoxicity. Overall, the prepared nanostructures are promising candidates for plasmonic applications under biologically relevant conditions.  相似文献   

    

Ngan Nguyen  Peter Thurgood  Aram Arash  Elena Pirogova  Sara Baratchi  Khashayar Khoshmanesh 《Advanced functional materials》2019,29(27)

This work demonstrates a simple method for fabricating nearly spherical dome structures on top of lithographically defined microfluidic channels using gallium‐based liquid metal droplets as fugitive ink. The droplets remain stable during the pouring and curing of polydimethylsiloxane and can be easily removed by applying a basic solution. This facilitates the formation of domes with diameters of a few hundred micrometers patterned on the desired locations of the channel. The expansion of the channel at the interface of the dome leads to formation of a large vortex inside the dome. Experiments using high‐speed imaging along with numerical simulations show the utility of the vortex‐induced flow rotation for orbiting of human monocytes and polystyrene microbeads inside the dome. The lateral displacement of liquids caused by the vortex is further utilized for creating controllable multiband flow/color profiles within a T‐mixer. The method enables the fabrication of customized, complex, and 3D microfluidic systems utilizing planar microfabricated structures.  相似文献   

    

Charalambos Evangeli  Jean Spiece  Sara Sangtarash  Aday J. Molina‐Mendoza  Marta Mucientes  Thomas Mueller  Colin Lambert  Hatef Sadeghi  Oleg Kolosov 《Advanced Electronic Materials》2019,5(10)

Nanoscale scanning thermal microscopy (SThM) transport measurements from cryogenic to room temperature on 2D structures with sub 30 nm resolution are reported. This novel cryogenic operation of SThM, extending the temperature range of the sample down to 150 K, yields a clear insight into the nanothermal properties of the 2D nanostructures and supports the model of ballistic transport contribution at the edge of the detached areas of exfoliated graphene which leads to a size‐dependent thermal resistance of the detached material. The thermal resistance of graphene on SiO₂ is increased by one order of magnitude by the addition of a top layer of MoS₂, over the temperature range of 150–300 K, providing pathways for increasing the efficiency of thermoelectric applications using van der Waals (vdW) materials. Density functional theory calculations demonstrate that this increase originates from the phonon transport filtering in the weak vdW coupling between the layers and the vibrational mismatch between MoS₂ and graphene layers.  相似文献