- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2019
- photovoltaic power generation system
- sensitivity analysis
- Monte Carlo
- fuzzy layering evaluation method
- Electrical Engineering and Automation
- Xi’an Jiaotong University
-
Fully convolutional networks in multimodal nonlinear microscopy images for automated detection of head and neck carcinoma: A pilot study
摘要： Background: A fully convolutional neural networks (FCN)-based automated image analysis algorithm to discriminate between head and neck cancer and non-cancerous epithelium based on nonlinear microscopic images was developed. Methods: Head and neck cancer sections were used for standard histopathology and co-registered with multimodal images from the same sections using the combination of coherent anti-Stokes Raman scattering, two-photon excited fluorescence, and second harmonic generation microscopy. The images analyzed with semantic segmentation using a FCN for four classes: cancer, normal epithelium, background, and other tissue types. Results: A total of 114 images of 12 patients were analyzed. Using a patch score aggregation, the average recognition rate and an overall recognition rate or the four classes were 88.9% and 86.7%, respectively. A total of 113 seconds were needed to process a whole-slice image in the dataset. Conclusion: Multimodal nonlinear microscopy in combination with automated image analysis using FCN seems to be a promising technique for objective differentiation between head and neck cancer and noncancerous epithelium.
关键词： digital pathology,semantic segmentation,diagnostics,second-harmonic generation,convolutional neural networks,two-photon excited fluorescence,spectral histopathology,image analysis,head and neck cancer,coherent anti-stokes Raman scattering
更新于2025-09-04 15:30:14
-
Study on the general system integration optimization method of the solar aided coal-fired power generation system
摘要： Solar aided coal-fired power generation (SAPG) has been attracted more and more attentions in recent years. However, its integration and optimization is a rather challenging work. Most of the studies are based on the researches of one or several certain schemes, and no general system integration optimization method (GIOM) considering all possibilities has been proposed. In this paper, a general system integration optimization model is developed, which is configured with 8 virtual molten salt heat exchangers (FHms) and used to simulate any scheme of different integration locations and heat distributions. A SAPG system based on Solar Two plant and a 600 MWe supercritical coal-fired plant is studied. The results show that at the relatively higher heliostat field power (HFP) work conditions, the heat energy should be injected into the highest pressure feedwater heater (FHs) as a priority. While at the relatively lower HFP and higher turbine power work conditions, the heat should be distributed to the two highest pressure FHs in a certain proportion instead of fully distributed to the highest pressure FHs. The performances of both the receiver and the power block are improved. The solar-electric conversion efficiency of SAPG system is obviously higher than that of Solar Two.
关键词： Optimal integration scheme,Solar aided power generation,Concentrating solar power,Integration system optimization,Coal-fired power plant
更新于2025-09-04 15:30:14
-
Carbonyl linked carbon nitride loading few layered MoS2 for boosting photocatalytic hydrogen generation
摘要： Pristine graphitic carbon nitride g-C3N4 materials, as a novel metal-free photocatalyst with moderate activity, have attracted intense interest. However, its fast photogenerated carriers recombination always induces a relative low performance. Herein, we for the first time report one new =C=O group linked g-C3N4 (CO-C3N4) through CO2-assisted thermal polymerization of urea. It is found that the edge =C=O groups work as the photogenerated electrons collection sites, and then promote the carriers separation. The visible-light phototatalytic hydrogen evolution performance of our synthesized samples shows 1.85 times higher than that of the reference g-C3N4. To get a considerable visible-light driven photocatalytic hydrogen generation, a new few layered MoS2 with a small size (ca. 20 nm) is prepared through a liquid exfoliation, and then is loaded onto the CO-C3N4. The optimal MoS2/CO-C3N4 sample gives the photocatalytic hydrogen evolution of 1990 and 1440μmol/(g*h) under the λ > 400 and λ > 420 illumination, higher than the reported values in literatures. The sample also shows a considerable excellent photocatalytic activity of 44.3 μmol/(g*h) under LED-600 condition.
关键词： water splitting,CO-C3N4,MoS2,photocatalysis,H2 generation
更新于2025-09-04 15:30:14
-
Space-Confined Seeded Growth of Black Silver Nanostructures for Solar Steam Generation
摘要： Plasmonic metal nanostructures have attracted considerable attention for solar energy harvesting due to their capability in photothermal conversion. However, the narrow resonant band of the conventional plasmonic nanoparticles greatly limits their application as only a small fraction of the solar energy can be utilized. Herein, a unique confined seeded growth strategy is developed to synthesize black silver nanostructures with broadband absorption in the visible and near-infrared spectrum. Through this novel strategy, assemblages of silver nanoparticles with widely distributed interparticle distances are generated in rod-shaped tubular spaces, leading to strong random plasmonic coupling and accordingly broadband absorption for significantly improved utilization of solar energy. With excellent efficiency in converting solar energy to heat, the resulting black Ag nanostructures can be made into thin films floating at the air/water interface for efficient generation of clean water steam through localized interfacial heating.
关键词： Space-confined synthesis,seeded growth,steam generation,photothermal,broadband absorption,black silver
更新于2025-09-04 15:30:14
-
Optical coupling between resonant dielectric nanoparticles and dielectric nanowires probed by third harmonic generation microscopy
摘要： Localized electromagnetic modes and negligible Ohmic losses dictate the growing interest to subwavelength all-dielectric nanoparticles. Although an exhaustive volume of literature dealt with interaction of all-dielectric nanostructures with free-space electromagnetic fields, they received little attention as integrated photonic elements. We present an experimental and numerical study of optical coupling between a resonant subwavelength silicon nanodisk and a silicon nanowire, as probed by third harmonic generation microscopy and full-wave simulations. First, by placing the nanodisks at different distances from the nanowire, we observed third harmonic intensity modulation by a factor of up to 4.5. This modulation is assigned to changes in the local field enhancement within the nanodisks caused by their coupling to the nanowires and subsequent shifting and broadening of their magnetic-type resonances. Interestingly, although the nanowire presents an additional loss channel for the nanodisk, we observed an increase in the local field strength within the nanodisk, as verified by rigorous full-wave simulations. Inversely, for the gap sizes that are smaller than ≈ 200 nm, we observe the influence of the nanoparticles on the propagation properties of the fundamental waveguide modes of the nanowire. The better understanding of the mutual influence of the Mie-resonant nanoparticles and waveguiding structures heralds integration of the former on photonic chips.
关键词： dielectric nanowire,third harmonic generation microscopy,silicon nanoparticles,Optical coupling
更新于2025-09-04 15:30:14
-
[IEEE 2017 International Conference on Computer, Electrical & Communication Engineering (ICCECE) - Kolkata (2017.12.22-2017.12.23)] 2017 International Conference on Computer, Electrical & Communication Engineering (ICCECE) - Particle Swarm Optimizations Based DG Allocation in Local PV Distribution Networks for Voltage Profile Improvement
摘要： It’s a important challenge in power system that to integrate Distribution Generation (DG) local radial distribution system. Optimal allocation of DGs in the network system leads to the minimization of the overall distribution power loss as well as the improvement of the overall voltage profile . Moreover the size of DG unit that alters reactive power flow and its path in a local radial distribution network can also have a substantial influence on voltage stability. This paper proposes an optimization methodology for identifying proper location and size of DG units in local distribution system. The optimization is implemented with the help of a particle swarm optimization technique. Results show the importance of selecting the location and size of DG units for enhancing the voltage stability of local radial distribution system.
关键词： Stability Index,Optimal allocation,Particle swarm optimization(PSO),Distribution Generation (DG)
更新于2025-09-04 15:30:14
-
[IEEE 2018 International Semiconductor Conference (CAS) - Sinaia, Romania (2018.10.10-2018.10.12)] 2018 International Semiconductor Conference (CAS) - Second Harmonic Generation: A Non-Destructive Characterization Method for Dielectric-Semiconductor Interfaces
摘要： This paper reviews the application of second harmonic generation (SHG) to characterize dielectric-semiconductor interfaces in microelectronics and photovoltaics. Based on non-linear optics, the method is non-destructive, so particularly advantageous for thin films. The theoretical background shows the possibility to access the electric field at interfaces and consequently to have a non-destructive measurement for interface state densities or fixed charges in oxides. Two more detailed examples of application of SHG characterization will be shown: passivation of silicon using thin film deposited alumina and interface analysis of silicon-on-insulator substrates.
关键词： interface states,dielectric-semiconductor interfaces,fixed oxide charges,interface electric field,second harmonic generation
更新于2025-09-04 15:30:14
-
A Robust Power Management Strategy with Multi-mode Control Features for an Integrated PV and Energy Storage System to take the Advantage of ToU Electricity Pricing
摘要： In this paper, a power management strategy (PMS) for an integrated residential solar photovoltaic (PV) and energy storage unit (ESU) is proposed for both grid-connected and islanded operations to take advantage of time-of-use pricing. This is an effective solution to integrate storage and renewable energy sources, such as solar PV, with the conventional grid to improve the reliability and efficiency of the power system and to reduce the total electricity cost for the consumer. An automatic switching control strategy is proposed to realize a smooth switching among the various operation modes of the proposed energy management strategy. The integrated PV-storage system is composed of a 5 kW PV arrays, a 3.5kWh ESU formed by 12V single lead acid batteries, and three power converters. The PMS ensures seamless switching of the ESU converter between the charging and the discharging mode and seamless switching between the inverting and the rectifying mode of the grid converter. It also ensures that the local loads are supplied when the grid fails. An experimental setup has been implemented in the laboratory using the real time FPGA GPIC (General Purpose Inverter Control) card from National Instrument to verify the practical feasibility of the proposed PMS under the various scenarios of the PV irradiation, load changings and the state of charge of the energy storage unit. The results show that the proposed PMS is effective and robust against various scenarios.
关键词： energy storage unit (ESU),photovoltaic (PV) generation,Power management system strategy (PMS)
更新于2025-09-04 15:30:14
-
A Comparative Study of Vertebrate Corneal Structure: The Evolution of a Refractive Lens
摘要： PURPOSE. Although corneal curvature plays an important role in determining the refractive power of the vertebrate eye, the mechanisms controlling corneal shape remain largely unknown. To address this question, we performed a comparative study of vertebrate corneal structure to identify potential evolutionarily based changes that correlate with the development of a corneal refractive lens. METHODS. Nonlinear optical (NLO) imaging of second-harmonic–generated (SHG) signals was used to image collagen and three-dimensionally reconstruct the lamellar organization in corneas from different vertebrate clades. RESULTS. Second-harmonic–generated images taken normal to the corneal surface showed that corneal collagen in all nonmammalian vertebrates was organized into sheets (?sh and amphibians) or ribbons (reptiles and birds) extending from limbus to limbus that were oriented nearly orthogonal (ranging from 77.78–88.28) to their neighbors. The slight angular offset (28–138) created a rotational pattern that continued throughout the full thickness in ?sh and amphibians and to the very posterior layers in reptiles and birds. Interactions between lamellae were limited to "sutural" ?bers in cartilaginous ?sh, and occasional lamellar branching in ?sh and amphibians. There was a marked increase in lamellar branching in higher vertebrates, such that birds (cid:2) reptiles > amphibians > ?sh. By contrast, mammalian corneas showed a nearly random collagen ?ber organization with no orthogonal, chiral pattern. CONCLUSIONS. Our data indicate that nonmammalian vertebrate corneas share a common orthogonal collagen structural organization that shows increased lamellar branching in higher vertebrate species. Importantly, mammalian corneas showed a different structural organization, suggesting a divergent evolutionary background.
关键词： stroma,nonlinear optical,collagen,cornea,second-harmonic generation
更新于2025-09-04 15:30:14
-
Piezotronics and piezo-phototronics with third-generation semiconductors
摘要： When uniform strain is applied to noncentrosymmetric semiconductor crystals, which are piezoelectric, static polarization charges are induced at the surface. If the applied strain is not uniform, these charges can even be created inside the crystal. The applied strain affects electronic transport and also photonic processes, and thus can be used to tune the material properties statically or dynamically. As a result, two new fields have emerged, namely piezotronics and piezo-phototronics. This article reviews the history of the two fields and gives a perspective on their applications. The articles in this issue of MRS Bulletin highlight progress in these two fields, and this article places this progress into perspective.
关键词： piezo-phototronics,piezoelectricity,piezotronics,semiconductor transport,third-generation semiconductors
更新于2025-09-04 15:30:14