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排序方式: 共有169条查询结果,搜索用时 15 毫秒
81.
We observe an enhancement of fluorescence from a single fluorescent sphere, which is sandwiched between two individual gold nanoparticles, forming a hot spot of strong field enhancement. The fluorescence enhancing hot spot is custom-designed by the deliberate assembly of gold nanoparticles with an atomic force microscope cantilever. The fluorescence intensity is monitored while the separation between the two gold nanoparticles is reduced by gradually pushing the gold nanoparticles closer to the fluorescent sphere. The fluorescence enhancement is maximal when the distance between the two gold nanoparticles is smallest, when the excitation polarization is parallel to the axis of the sandwich, and when the fluorescent sphere is positioned exactly on the axis connecting the two gold nanoparticles. 相似文献
82.
Beatriz P. Garcia-Salgado Volodymyr I. Ponomaryov Sergiy Sadovnychiy Marco Robles-Gonzalez 《Journal of Real-Time Image Processing》2018,15(3):687-704
Hyperspectral and multispectral imagery allows remote-sensing applications such as the land-cover mapping, which is a significant baseline to understand and to monitor the Earth. Furthermore, it is a relevant process for socio-economic activities. For that reason, high land-classification accuracies are imperative, and minor image processing time is essential. In addition, the process of gathering classes’ documented samples is complicated. This implies that the classification system is required to perform with a limited number of training observations. Another point worth mentioning is that there are hardly any methods that can be used analogously for hyperspectral or multispectral images. This paper aims to propose a novel classification system that can be used for both types of images. The designed classification system is composed of a novel parallel feature extraction algorithm, which utilises a cluster of two graphics processing units in combination with a multicore central processing unit (CPU), and an artificial neural network (ANN) particularly devised for the classification of the features ensued by the implemented feature extraction method. To prove the performance of the proposed classification system, it is compared with non-parallel and CPU-only-parallel implementations employing multispectral and hyperspectral databases. Moreover, experiments with different number of samples for training the classifier are performed. Finally, the proposed ANN is compared with a state-of-the-art support vector machine in classification and processing time results. 相似文献
83.
Frank Babick Lars Hillemann Michael Stintz Tim Dillenburger Michael Pitz Albert Hellmann Sergiy Antonyuk Siegfried Ripperger Franz J. T. Huber Stefan Will Ruth Wernet Martin Seipenbusch Manuel Gensch Alfred Weber Dennis Kiesler Einar Kruis Rainer Friehmelt Bernd Sachweh 《化学,工程师,技术》2018,90(7):923-936
The performance of particle‐based products depends on a multiple set of particle properties. To monitor them during particle manufacturing, three novel aerosol measurement techniques were developed: wide‐angle light scattering (WALS), three‐dimensional laser scattering (3D‐LSS), and differential aerodynamic particle sizing (DAPS). They measure particle shape, aggregate structure, and particle size, i.e., radius of gyration and aerodynamic diameter. The techniques were tested for rod‐like organic pigments and partially sintered SiO2 aggregates, which were produced by two new aerosol generators. 相似文献
84.
Kapustenko Petro Arsenyeva Olga Fedorenko Olena Kusakov Sergiy 《Clean Technologies and Environmental Policy》2022,24(1):67-76
Clean Technologies and Environmental Policy - The paper presents a Process Integration application for waste heat utilisation from exhaust gas streams with partial condensation. It is based on the... 相似文献
85.
Rogalsky Sergiy Tarasyuk Oksana Vashchuk Alina Davydenko Valeriy Dzhuzha Oleg Motrunich Sviatoslav Cherniavska Tetiana Oleksii Papeikin Bodachivska Larysa Bardeau Jean-François 《Journal of Materials Science》2022,57(10):6102-6114
Journal of Materials Science - Tertiary fatty amide, namely N,N-dibutylundecenamide (DBUA), has been synthesized and evaluated as potential plasticizer for polyvinyl chloride (PVC). Homogeneous... 相似文献
86.
Lu Wang Sergiy Patskovsky Bastien Gauthier-Soumis Michel Meunier 《Small (Weinheim an der Bergstrasse, Germany)》2022,18(1):2105209
Plasmonic nanostructures have raised the interest of biomedical applications of surface-enhanced Raman scattering (SERS). To improve the enhancement and produce sensitive SERS probes, porous Au–Ag alloy nanoparticles (NPs) are synthesized by dealloying Au–Ag alloy NP-precursors with Au or Ag core in aqueous colloidal environment through galvanic replacement reaction. The novel designed core–shell Au–Ag alloy NP-precursors facilitate controllable synthesis of porous nanostructure, and dealloying degree during the reaction has significant effect on structural and spectral properties of dealloyed porous NPs. Narrow-dispersed dealloyed NPs are obtained using NPs of Au/Ag ratio from 10/90 to 40/60 with Au and Ag core to produce solid core@porous shell and porous nanoshells, having rough surface, hollowness, and porosity around 30–60%. The clean nanostructure from colloidal synthesis exhibits a redshifted plasmon peak up to near-infrared region, and the large accessible surface induces highly localized surface plasmon resonance and generates robust SERS activity. Thus, the porous NPs produce intensely enhanced Raman signal up to 68-fold higher than 100 nm AuNP enhancement at single-particle level, and the estimated Raman enhancement around 7800, showing the potential for highly sensitive SERS probes. The single-particle SERS probes are effectively demonstrated in quantitative monitoring of anticancer drug Doxorubicin release. 相似文献
87.
88.
Christian Schrader Jürgen Schmidt Michael Diefenbeck Thomas Mückley Sergiy Zankovych Jörg Bossert Klaus D. Jandt Mathilde Faucon Ulrich Finger 《Advanced Engineering Materials》2012,14(3):B21-B27
The surface properties of titanium alloy implants for improved osseointegration in orthopaedic and dental surgery have been modified by many technologies. Hydroxyapatite coatings with a facultative integration of growth factors deposited by plasma spraying showed improved osseointegration. Our approach in order to enhance osseointegration was carried out by a surface modification method of titanium alloy implants called plasma chemical oxidation (PCO). PCO is an electrochemical procedure that converts the nm‐thin natural occurring titanium‐oxide layer on an implant to a 5 µm thick ceramic coating (TiOB‐surface). Bioactive TiOB‐surfaces have a porous microstructure and were loaded with calcium and phosphorous, while bioinert TiOB‐surfaces with less calcium and phosphorous loadings are smooth. A rat tibial model with bilateral placement of titanium alloy implants was employed to analyze the bone response to TiOB‐surfaces in vivo. 64 rats were randomly assigned to four groups of implants: (i) pure titanium alloy (control), ii) titanium alloy, type III anodization, (iii) bioinert TiOB‐surface, and (iv) bioactive TiOB‐surface. Mechanical fixation was evaluated by pull out tests at 3 and 8 weeks. The bioactive TiOB‐surface showed significantly increased shear strength at 8 weeks compared to all other groups. 相似文献
89.
Sergiy Kalnaus Jixi Zhang Yanyao Jiang 《Metallurgical and Materials Transactions A》2011,42(2):249-447
Stress corrosion cracking of the high-strength martensitic steel AISI 4340 (yield stress = 1503 MPa) in NaCl aqueous solutions
of different concentrations was studied experimentally using compact tension specimens in free corroding conditions. The experiments
were conducted under the controls of constant load, constant crack opening displacement (COD), constant loading rate, and
constant COD rate. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold
stress intensity factor and the plateau velocity in the 3.5 wt pct NaCl solution. Dependence of the plateau velocity on the
NaCl concentration was observed, whereas the values of the threshold stress intensity factors seem to be independent of the
NaCl concentration in distilled water. 相似文献
90.
Ruzmetov D Oleshko VP Haney PM Lezec HJ Karki K Baloch KH Agrawal AK Davydov AV Krylyuk S Liu Y Huang J Tanase M Cumings J Talin AA 《Nano letters》2012,12(1):505-511
Rechargeable, all-solid-state Li ion batteries (LIBs) with high specific capacity and small footprint are highly desirable to power an emerging class of miniature, autonomous microsystems that operate without a hardwire for power or communications. A variety of three-dimensional (3D) LIB architectures that maximize areal energy density has been proposed to address this need. The success of all of these designs depends on an ultrathin, conformal electrolyte layer to electrically isolate the anode and cathode while allowing Li ions to pass through. However, we find that a substantial reduction in the electrolyte thickness, into the nanometer regime, can lead to rapid self-discharge of the battery even when the electrolyte layer is conformal and pinhole free. We demonstrate this by fabricating individual, solid-state nanowire core-multishell LIBs (NWLIBs) and cycling these inside a transmission electron microscope. For nanobatteries with the thinnest electrolyte, ≈110 nm, we observe rapid self-discharge, along with void formation at the electrode/electrolyte interface, indicating electrical and chemical breakdown. With electrolyte thickness increased to 180 nm, the self-discharge rate is reduced substantially, and the NWLIBs maintain a potential above 2 V for over 2 h. Analysis of the nanobatteries' electrical characteristics reveals space-charge limited electronic conduction, which effectively shorts the anode and cathode electrodes directly through the electrolyte. Our study illustrates that, at these nanoscale dimensions, the increased electric field can lead to large electronic current in the electrolyte, effectively shorting the battery. The scaling of this phenomenon provides useful guidelines for the future design of 3D LIBs. 相似文献