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Semi-implicit FDTD TW scheme for modelling effective surface plasmons
摘要： A semi-implicit finite-difference time-domain thin-wire (TW) scheme with a relaxed stability condition is proposed for modelling effective surface plasmons in waveguide metamaterials. Its formulation is based on introducing the Newmark-Beta method into the TW formulation based on the contour-path integral of Maxwell’s equations around a wire. The resultant scheme is magnetically implicit. Its stability, accuracy and efficiency are assessed in the application to a wire-added parallel-plate waveguide perturbed with a small gap.
关键词： Newmark-Beta method,surface plasmons,semi-implicit FDTD,thin-wire scheme,waveguide metamaterials
更新于2025-09-04 15:30:14
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In situ synthesis of Z-scheme BiPO4/BiOCl0.9I0.1 heterostructure with multiple vacancies and valence for efficient photocatalytic degradation of organic pollutant
摘要： Design and construction of Z-scheme photocatalyst has been attracted much attention, which is a great challenge to develop highly efficient photocatalyst without the external redox mediators. Herein, a novel efficient redox-mediator-free Z-scheme BiPO4/BiOCl0.9I0.1 heterojunction is synthesized in situ via a mild 90℃ water bath reaction. The as-synthesized BiPO4/BiOCl0.9I0.1 heterostructure exhibits outstanding photocatalytic performance for degradation of phenol and Rhodamine B, approximately 2.6 and 4.3 times higher than that of BiOCl0.9I0.1, respectively. The BiPO4/BiOCl0.9I0.1 heterostructure have multiple vacancies and valence, such as Bi5+, Bi3+, Bi(3-x)+, I-, I3-, and IO3-, which could facilitate the charge separation and transfer in the photocatalytic process. The higher photocatalytic activity of redox-mediator-free Z-scheme BiPO4/BiOCl0.9I0.1 heterostructure could be attributed to the strong redox ability, multiple charge transfer channels via the various defects, and tight contact due to in situ synthesis. The finding provides some new insights for the design of effective direct Z-scheme photocatalyst with multiple defects.
关键词： direct Z-scheme heterojunction,photocatalysis,BiOCl0.9I0.1/BiPO4,redox-mediator-free,multiple defects
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Information and Communication Technology Convergence (ICTC) - Jeju Island, Korea (South) (2018.10.17-2018.10.19)] 2018 International Conference on Information and Communication Technology Convergence (ICTC) - IoT lighting address scheme and profile API design for interoperability
摘要： As IoT becomes a hot topic, IoT lighting that can be controlled remotely by smartphones or internet is expanding. Because lighting suppliers are using proprietary CMS and proprietary lighting protocols or existing lighting protocols, interoperability is becoming an important issue when applying IoT lighting. In this paper, we designed the address scheme and profile API and applied it to support interoperability even if IoT lighting and CMS are made by other vendors. In addition, the designed address scheme and profile APIs can be used to support energy savings, user friendliness, control diversity, IoT lighting status consistency and automated maintenance. We have proved that existing lighting and IoT lighting can interoperate by interworking with control devices developed by different companies and five kinds of gateways.
关键词： IoT lighting,IoT Interoperability,profile,API,address scheme,smart lighting
更新于2025-09-04 15:30:14
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Designed of bifunctional Z-scheme CuSnO3@Cu2O heterojunctions film for photoelectrochemical catalytic reduction and ultrasensitive sensing nitrobenzene
摘要： A direct Z-scheme CuSnO3@Cu2O heterojunctions photo-electroactive material were reasonably designed and fabricated by electrodeposited Cu2O on fluoride doped tin oxide (FTO) substrate followed anchoring 3D CuSnO3 microspheres onto Cu2O film. The novel 3D architectures can favor the mass transfer, provide multiple active sites and improve light absorption during the photoelectrocatalytic reactions. The artificial heterogeneous Z-scheme photoelectrochemical (PEC) system further prolong electrons path, promote the separation of photogenerated charge carriers and maintain high redox ability. As expected, the constructed Z-scheme CuSnO3@Cu2O as the photocathode show excellent dual functional properties which can not only detect the trace nitrobenzene (NB) but also undergo catalytic reduction of NB to less toxic species (aniline, AN) under visible light irradiation. Based on CuSnO3@Cu2O photocathode, the photocurrent was linearly proportional to the concentration of NB ranging from 0.5 nmol L-1 to 100 μmol L-1, and the detection limit (S/N = 3) was 0.43 nmol L-1. The fabricated sensor was successfully used to sensing the trace NB in real samples and it showed excellent anti-interference ability, good reproducibility and high stability. Besides, CuSnO3@Cu2O exhibited high PEC activity for NB reduction, 85.70% reduction efficiency was achieved within irradiation for 2.5 h. Thus, this study may provide insights into designing advanced photoeletrocatalysts for energy conversion and render a tunable platform in photoelectrochemistry for the monitor and clean-ups of environmental pollutants.
关键词： Photoelectrochemical sensor,Z-scheme,Nitrobenzene,Photoelectroreduction,CuSnO3@Cu2O heterojunctions
更新于2025-09-04 15:30:14
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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
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Proposal and Implementation of Personal Authentication Method by Visual Secret Sharing Scheme Using Smart Glasses
摘要： Personal authentication by password only is major, however it has some security risks. As a new approach to personal authentication, several methods by Visual Secret Sharing Scheme have been proposed. We propose a personal authentication method by Visual Secret Sharing Scheme using smart glasses, that improve the methods in previous studies. The method is secure against shoulder surfing, eavesdropping, and leakage of information from the server. Moreover, in the method, an encrypted one-time password is decrypted automatically. Furthermore, by it is conducting implementations and evaluation experiments, found that the method has high convenience in operating time, operability, and ease of learning operation.
关键词： smart glasses,security,Visual Secret Sharing Scheme,one-time password,personal authentication
更新于2025-09-04 15:30:14
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Z-Scheme Photocatalytic CO2 Reduction on a Heterostructure of Oxygen-Defective ZnO/Reduced Graphene Oxide/UiO-66-NH2 under Visible Light
摘要： The construction of a Z-scheme heterojunction is an effective way to isolate photogenerated electron-holes and enhance the activity of the semiconductor photocatalysts. However, the Z-scheme heterojunctions based on metal organic framework (MOF) were rarely reported. Herein, a novel oxygen-defective ZnO (O-ZnO)/reduced graphene oxide (rGO)/UiO-66-NH2 Z-scheme heterojunction has been prepared by a facile solvothermal route. The morphologies, structures and photoelectric characteristics of the acquired materials were characterized in detail. The photocatalytic activity of the O-ZnO/rGO/UiO-66-NH2 heterostructure was assessed by photocatalytic CO2 reduction. The results indicated that the O-ZnO/rGO/UiO-66-NH2 heterostructure could efficiently reduce CO2 to CH3OH and HCOOH, and its activity was significantly superior to that of O-ZnO/UiO-66-NH2 and ZnO/rGO/UiO-66-NH2. Under illumination of visible light, the yield of CH3OH and HCOOH over O-ZnO/rGO/UiO-66-NH2 heterostructure reached 34.83 and 6.41 μmol·g-1·h-1, respectively. The high photoactivity of O-ZnO/rGO/UiO-66-NH2 heterostructure should be caused by the effective spatial separation of photogenerated electrons and holes via a Z-scheme charge transfer. This research may well present an insight into the design and fabrication of novel Z-scheme photocatalytic systems for environmental remediation and energy conversion.
关键词： CO2 reduction,metal organic framework,photocatalytic,oxygen-defective,Z-scheme
更新于2025-09-04 15:30:14
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Approximate quantum state reconstruction without a quantum channel
摘要： We investigate the optimal quantum state reconstruction from the cloud to many spatially separated users by a measure-broadcast-prepare scheme without the availability of the quantum channel. The quantum state equally distributed from the cloud to an arbitrary number of users is generated at each port by an ensemble of known quantum states with assistance from classical information of measurement outcomes by broadcasting. The obtained quantum state for each user is optimal in the sense that the ?delity universally achieves the upper bound. We present the universal quantum state distribution by providing physical realizable measurement bases in the cloud as well as the reconstruction method for each user. The quantum state reconstruction scheme works for arbitrary many identical pure input states in the general dimensional system.
关键词： measure-broadcast-prepare scheme,quantum channel,quantum state reconstruction,optimal ?delity
更新于2025-09-04 15:30:14
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A Metal‐Organic‐Framework‐Derived g‐C3N4/α‐Fe2O3 Hybrid for Enhanced Visible‐Light‐Driven Photocatalytic
摘要： As one of the most efficient systems for photocatalytic hydrogen evolution, the Z-scheme system consisting of different semiconductors with a reversible donor-acceptor pair has attracted great attention. Considering for the nontoxicity and low cost of photocatalysts, a series of g-C3N4/α-Fe2O3 hybrids were rationally constructed based on the Z-scheme mechanism for the first time using a metal-organic framework template approach that can fine-tune the compositions and properties of the hybrids. An optimized hybrid, g-C3N4/α-Fe2O3-2, exhibited prominent photocatalytic water splitting performance with a visible light response. Under irradiation of visible light (λ > 420 nm), the hybrid shows a high durability and superior hydrogen production rate of 2066.2 μmol g-1 h-1 from water splitting, which is approximately three times greater than that of bulk g-C3N4 because of the effective separation of photo-excited charge carriers by two narrow bandgap semiconductors tightly coupled with the Z-scheme structural feature.
关键词： Z-scheme system,hydrogen evolution,g-C3N4/α-Fe2O3 hybrid,metal-organic frameworks
更新于2025-09-04 15:30:14
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<i>In situ</i> topotactic fabrication of direct Z-scheme 2D/2D ZnO/Zn <sub/>x</sub> Cd <sub/>1?x</sub> S single crystal nanosheet heterojunction for efficient photocatalytic water splitting
摘要： Direct Z-scheme heterojunction can effectively enhance the photocatalytic activity due to its low carrier recombination rate and high redox ability. In this study, a 2D/2D ZnO/ZnxCd1?xS single crystal nanosheet heterojunction is synthesized in situ by topotactic sulfurization/oxidization pyrolysis of Zn/Cd/Al layer double hydroxides (LDHs). Its unique structure provides not only numerous intimate interfaces but also a direct Z-scheme junction. The in situ topotactic fabrication of ZnO by the oxidation process causes some Zn ions to dissolve out from the Zn0.67Cd0.33S solid solution nanosheets with increase in annealing temperature and time. The longer the time for oxidation, the more ZnO is obtained. The formation of ZnO yields 2D/2D ZnO/ZnxCd1?xS single crystal nanosheet heterojunction, which increases the visible light absorption and boosts the separation of photogenerated carriers. The ZnO/ZnxCd1?xS-4 single crystal nanosheet heterojunction presents the highest photocatalytic activity under visible light irradiation (38.93 mmol h?1 g?1), which is nearly 16.93 times higher than that of Zn0.67Cd0.33S-300, and an external quantum efficiency of 40.97% at λ = 420 nm. The proposed synthetic route for the construction of 2D/2D ZnO/ZnxCd1?xS single crystal nanosheet provides a direct Z-scheme structure with highly efficient photocatalytic hydrogen evolution activity.
关键词： 2D/2D ZnO/ZnxCd1?xS,photocatalytic water splitting,Zn/Cd/Al layer double hydroxides,Direct Z-scheme heterojunction,topotactic sulfurization/oxidization pyrolysis
更新于2025-09-04 15:30:14