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oe1(光电查) - 科学论文

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出版时间
  • 2019
  • 2018
研究主题
  • parasitic patches
  • Direct coupled
  • gap coupled
  • hybrid coupled
  • composite mode
  • Pumped hydro storage
  • Reliability
  • Particle swarm optimization
  • Hybrid system
  • photovoltaic power
应用领域
  • Electrical Engineering and Automation
  • Electronic Science and Technology
机构单位
  • State Grid Sichuan Electric Power Research Institute
  • SVKM’s DJSCE
  • University of Electronic Science and Technology of China
  • State Grid Sichuan Electric Power Company
  • DIAT
  • Aalborg University
  • Tsinghua Sichuan Energy Internet Research Institute
844 条数据
?? 中文（中国） ▾

  • Influence of silane coupling agent on the properties of UV curable SiO2-PMMA hybrid nanocomposite

    摘要： This work reports the preparation of UV-curable organic–inorganic hybrid nanocomposites synthetized by sol–gel method with the aim of obtaining highly transparent anti-abrasive coatings with long-term storage and stability for the protection of organic light emitting diodes (OLEDs). The inorganic phase is composed of tetraethoxysilane (TEOS) condensed under acid catalysis and mixed with tetrafunctional acrylate monomer and oligomer. Vinyltriethoxysilane (VTES), 3-methacryloxypropyltrimethoxysilane (MEMO), and 3-mercaptopropyltriethoxysilane (MTMO) are used as silane coupling agent and hybrid network modifier. Among the various parameters influencing the structure and properties of the hybrid, this work focuses on the nature and amount of coupling agent and their influence in terms of transparency, mechanical properties, and stability of the formulation. An optimum can be found in the silica to coupling agent ratio. Low level of functionalization leads to hybrids displaying poor optical performances and stability due to the coalescence of silica domains. On the contrary, an excess of functionalization reduces the abrasion resistance and the silica network formation. Changing the organic pendant of coupling agents greatly influences the properties of the coating by promoting the organic–inorganic balance. Dense and flexible as well as mechanically resistant coatings can be obtained from similar formulation by simply tuning the nature of the coupling agent depending of the needs of the application.

    关键词： Sol–gel,Abrasion resistance,Nanocomposite,Hybrid coatings,UV-curable

    更新于2025-09-04 15:30:14

  • The structure of PA-Se-S-Cd composite materials probed with FTIR spectroscopy

    摘要： Composite organic-inorganic functional materials are of significant importance in various applications of science and technology. In this work, PA-Se-S and PA-Se-S-Cd composite materials obtained by employing the sorption-diffusion method are discussed. A single precursor – K2SeS2O6 – was used as the source of both sulfur and selenium. In the aqueous solution, SeS2O6 2? and its decomposition products diffused into the polymer where they reacted with Cd2+ ions so that to form cadmium chalcogenide particles. Fourier-transform infrared (FTIR) spectroscopy was used to characterize the interactions between polyamide 6 and inorganic constituents, namely, K2SeS2O6, CdS and CdSe. The spectral behavior of amide I, II, A and B bands evidenced the competing formation of complex bonding structures based on the formation of covalent, electrostatic and hydrogen bonding between the PA 6 amide (NHCO) groups and the inorganic constituents. The number and the type of the formed bonds depend on the polyamide 6 exposure time in the K2SeS2O6 precursor solution. Such a complex interaction induces obvious conformational changes of the polyamide 6 chains. A possible bonding mechanism has been proposed to explain the observed spectral phenomena.

    关键词： Inorganic-organic hybrid materials,Cadmium chalcogenides,Polyamide 6,Infrared spectra,Potassium selenotrithionate

    更新于2025-09-04 15:30:14

  • AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Preliminary tests of an integrated gas turbine-solar particle heating and energy storage system

    摘要： Worldwide research efforts are aiming to push the operating temperature limit of CSP systems to improve efficiency and, as a result, the levelized cost of electricity. Furthermore, with higher operating temperatures, a number of new concepts become feasible, the most important of which are supercritical CO2 cycles and air Brayton cycles. Hybrid CSP-fossil fuel systems fall within the air Brayton family of concepts, where the solar field is used to preheat air, while a fossil fuel is burned to bring the air temperature to the firing temperature of a gas-fired Brayton turbine. To make this approach more attractive and environmentally friendly, it is desirable to maximize the solar “contribution” and minimize fuel assistance. This can be done by using novel receivers that increase the air temperature significantly and/or employing a recuperator, where the operating pressure and temperature are lower than conventional Brayton cycles. This paper presents information about an experimental integrated gas turbine-solar particle heating system that uses the hybrid approach. The system is located on the campus of King Saud University in Riyadh, Saudi Arabia and has a peak thermal power of 300 kW. In addition to providing details about the individual components and how they are integrated, the paper explains the start-up procedure, which consists of preheating the system with the heliostat field, followed by additional heating from the turbine itself until the nominal heat exchanger operating temperature is reached, at which point on-sun operation can commence. The study shows that solar preheating requires one to two days to complete, followed by a few hours of heating by the turbine to bring the temperature to about 560°C. Furthermore, with a temperature rise of up to 180°C in the particle heating receiver (and a drop of 10°C in the particle conveyor), the maximum particle temperature will approach 730°C, making the solar contribution significant. As larger scale systems will naturally allow for larger particle drop heights and higher temperature rises in the receiver, it is envisaged that maximum particle tempertures in those systems will approach the firing temperatures of recuperated turbines, making this solution technically, economically, and environmentally worth considering.

    关键词： solar preheating,CSP systems,particle heating receiver,hybrid CSP-fossil fuel systems,gas turbine

    更新于2025-09-04 15:30:14

  • Fuzzy Based Network Assignment and Link-Switching Analysis in Hybrid OCC/LiFi System

    摘要： In recent times, optical wireless communications (OWC) have become attractive research interest in mobile communication for its inexpensiveness and high-speed data transmission capability and it is already recognized as complementary to radio-frequency (RF) based technologies. Light fidelity (LiFi) and optical camera communication (OCC) are two promising OWC technologies that use a photo detector (PD) and a camera, respectively, to receive optical pulses. These communication systems can be implemented in all kinds of environments using existing light-emitting diode (LED) infrastructures to transmit data. However, both networking layers suffer from several limitations. An excellent solution to overcoming these limitations is the integration of OCC and LiFi. In this paper, we propose a hybrid OCC and LiFi architecture to improve the quality-of-service (QoS) of users. A network assignment mechanism is developed for the hybrid system. A dynamic link-switching technique for efficient handover management between networks is proposed afterward which includes switching provisioning based on user mobility and detailed network switching flow analysis. Fuzzy logic (FL) is used to develop the proposed mechanisms. A time-division multiple access (TDMA) based approach, called round-robin scheduling (RRS), is also adopted to ensure fairness in time resource allocation while serving multiple users using the same LED in the hybrid system. Furthermore, simulation results are presented taking different practical application scenarios into consideration. The performance analysis of the network assignment mechanism, which is provided at the end of the paper, demonstrates the importance and feasibility of the proposed scheme.

    关键词： fuzzy logic,network assignment,hybrid system,optical wireless communications,QoS,LiFi,OCC,link-switching

    更新于2025-09-04 15:30:14

  • Hybrid transmission of unicast and broadcast signals without optical filter for WDM systems

    摘要： This paper proposes and experimentally demonstrates the hybrid transmission of unicast and broadcast signals without using optical filters for the WDM systems. The dual-wavelength generated from a laser source are modulated by a phase modulator (PM) with a broadcast signal. Then, the central carriers and side-bands are separated by using a polarization beam splitter (PBS) and modulated with unicast data using Mach-Zender modulator (MZM). After combining side-bands (broadcast data) and central carriers (unicast data) using PBS, the hybrid data are transmitted through 25 km single mode fiber (SMF) to the remote node (RN). By probably adjusting the polarization controller (PC), the central carriers and side-bands are separated by PBS into two orthogonal polarization states. After transmission over 25 km SMF, the measured bit error rate (BER) curves and eye diagrams show that the performance of the proposed system is excellent to simultaneously transmit both unicast and broadcast signals. Moreover, only two modulators are required, which is cost-effective and also FBG or optical filter is not required due to sensitivity to temperature that decreases the system stability.

    关键词： Wavelength-division-multiplexing (WDM) system,Hybrid signal Transmission,Optical filter,Broadcast signal,Unicast signal

    更新于2025-09-04 15:30:14

  • Tailoring the Linear and Second-Order Nonlinear Optical Responses of the Titanium-MIL-125 Metal-Organic Framework through Ligand Functionalization: A First Principles Study

    摘要： Density functional theory calculations have been performed to investigate the linear and second order nonlinear optical (NLO) properties of titanium-based MIL-125 metal-organic frameworks in crystalline form, in which the 1,4-benzene-dicarboxylate (BDC) linkers are modified by introducing different functional groups or by extending BDC ligand to contain two (MIL-126) and three (MIL-127) benzene rings. Our results reveal that the functionalization of BDC linker tends to increase the dielectric constants and the magnitude of birefringence of MIL-125, especially for the aminated derivatives. Correspondingly, the incorporation of substituent group will improve the phase matching performance of MIL-125. As for the second harmonic generation (SHG) susceptibility, the SHG activity of the pristine MIL-125 is comparable to KDP, which can be attributed mostly to the contributions of TiO5(OH) octahedra. It is noted that after introducing substituent group into BDC linker, the organic part will have a remarkable influence on the SHG intensity. However, the specific effect on the NLO response is dependent on the type of functional group incorporated into BDC ligand, and only the inclusion of amine group that is strongly electron-donating can obviously enhance the SHG activity of MIL-125. In addition, MIL-126 and MIL-127 with longer aromatic linking unit are not suitable to act as NLO materials due to their poor phase matching abilities, but they are the promising candidates for the low dielectric constant materials. The present study can provide theoretical insights to design new second-order NLO materials based on MIL-125.

    关键词： Nonlinear Optical Properties,Density Functional Theory,Hybrid Materials,Ligand Functionalization,Metal-Organic Framework,Plasmonics,Optical,Magnetic

    更新于2025-09-04 15:30:14

  • HIGHLY INTERGRATED X-BAND LTCC RECEIVER MODULE

    摘要： A highly integrated X-band receiver module is designed based on a 10-layered low temperature co-fired ceramic (LTCC) substrate. A compact X-band bandpass filter (BPF), an intermediate frequency (IF) band hybrid and an IF band BPF are proposed for the receiver module. The measured gain parameter of the proposed receiver is higher than 51 dB, and noise figure (NF) and image rejection are better than 2.5 dB and 37 dB, respectively. The overall size of the receiver module is only 54 mm × 15 mm × 1 mm. Comparisons and discussions are also provided.

    关键词： receiver module,bandpass filter,LTCC,hybrid,X-band,image rejection

    更新于2025-09-04 15:30:14

  • The Effective Conjugation Length is Responsible for the Red/Green Spectral Tuning in the Cyanobacteriochrome Slr1393g3

    摘要： The origin of the spectral shift from a red- to a green-absorbing form in a cyanobacteriochrome, Slr1393g3, is identified by application of combined quantum mechanics/molecular mechanics simulations. This protein, related to classical phytochromes, carries the open-chain tetrapyrrole chromophore phycocyanobilin. Our calculations reveal that the effective conjugation length in the chromophore becomes shorter upon conversion from the red to the green form. This is related to the planarity of the entire chromophore. A large distortion is found for the terminal pyrrole rings A and D, however, the D ring contributes stronger to the photoproduct tuning, despite a larger change in the twist of the A ring. Our findings implicate that the D ring twist can be exploited to regulate absorption of the photoproduct. Hence, mutations that affect the D ring twist can lead to rational tuning of the photoproduct absorption that allows tailoring of cyanobacteriochromes for biotechnological applications such as optogenetics and bioimaging.

    关键词： Chromophore,Cyanobacteriochrome,Tetrapyrrole,Spectral Tuning,Hybrid QM/MM

    更新于2025-09-04 15:30:14

  • Low‐dimensional hybrid perovskites containing an organic cation with an extended conjugated system: tuning the excitonic absorption features

    摘要： Low-dimensional hybrid perovskites are receiving increased attention. One of the advantages of the low dimensional hybrids over their 3D counterparts is their greater structural flexibility towards the incorporation of bigger, more complex, organic cations. In this communication, we introduce a pyrene derivative as an organic cation containing an extended π-system for use in a variety of low dimensional hybrids. We show that materials with different excitonic absorption features can be obtained by tuning the iodide/lead ratio in the precursor solutions, using the same pyrene cation. In this way, hybrids with optical characteristics corresponding to 2D, 1D and 0D hybrid perovskites are obtained. The formation and thermal stability of the different hybrids is analysed and compared.

    关键词： excitons,stability,organic-inorganic hybrid composites,low-dimensional,perovskite phases

    更新于2025-09-04 15:30:14

  • in a hybrid trap

    摘要： We report on the production of a 41K-87Rb dual-species Bose-Einstein condensate in a hybrid trap, consisting of a magnetic quadrupole and an optical dipole potential. After loading both atomic species in the trap, we cool down 87Rb first by magnetic and then by optical evaporation, while 41K is sympathetically cooled by elastic collisions with 87Rb. We eventually produce two-component condensates with more than 105 atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.

    关键词： Bose-Einstein condensate,immiscibility,hybrid trap,dual-species,sympathetic cooling

    更新于2025-09-04 15:30:14