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Investigation of tungsten halogen lamp for possible usage as heat source for testing solar collector

Energy and Built Environment 2024年第4期5卷 517-528页

作者： Rapeepong Peamsuwan Pathiwat Waramit Ittipon Worapun Bundit Krittacom Tanakorn Phoo-Ngernkham Ratinun Luampon Department of Applied Physics Faculty of Science and Liberal ArtsRajamangala University of Technology Isan744Suranarai Rd.Nai mueangMueangNakhon Ratchasima 30000Thailand Department of Mechanical Engineering Faculty of Engineering and TechnologyRajamangala University of Technology Isan744Suranarai Rd.Nai mueangMueangNakhon Ratchasima 30000Thailand Department of Civil Engineering Faculty of Engineering and TechnologyRajamangala University of Technology Isan744Suranarai Rd.Nai mueangMueangNakhon Ratchasima 30000Thailand Development in Technology of Porous Materials Research Laboratory:DiTo-Lab Thailand

Artificial sunlight is a heat source in solar collector testing,where the light intensity and ambient conditions are controlled to provide uniformity in each *** this study,twenty-five tungsten halogen lamps of 300 W 220 V were investigated for possible usage as the heat *** experiment was conducted by varying the height of the lamps to the light field(H_(d)).The EN-12975-2 Standard was used to control the quality of the heat source on the light *** results showed that the average light intensity(I_(avg))decreased with an increase in *** H_(d) was low,the%uniformity values(%u_(xy))met the *** small light field area met the EN-12975-2 Standard better than the large area.A comparison of solar collector testing under a heat source from tungsten halogen lamps and natural sunlight was subsequently performed,and the experimental results were in accordance with the EN-12975-2 Standard.A single-channel flat plate solar collector was used as the test device and air was used as the working *** experimental results revealed that the solar collector thermal efficiency(η_(avg))trends were similar for both the heat source from tungsten halogen lamps and natural sunlight testing.A low%u_(xy) resulted in a𝜂avg that was more similar to that of natural sunlight.

关键词： Solar simulator EN-12975-2 Standard Light intensity Uniformity value Thermal efficiency

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TiZrHfNb refractory high-entropy alloys with twinning-induced plasticity

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Journal of Materials science & technology 2024年第20期187卷 72-85页

作者： Shubin Wang Da Shu Peiying Shi Xianbing Zhang Bo Mao Donghong Wang Peter.K.Liaw Baode Sun Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA

The twinning-induced plasticity(TWIP)effect has been widely utilized in austenite steels,β-Ti alloys,and recently developed face-centered-cubic(FCC)high-entropy alloys(HEAs)to simultaneously enhance the tensile strength and *** this study,for the first time,the TWIP effect through hierarchical{332}<113>mechanical twinning has been successfully engineered into the TiZrHfNb refractory HEAs by decreasing temperature and tailoring the content of Nb to destabilize the BCC *** cryogenic tem-perature,the comprehensive hierarchical{332}<113>mechanical twins are activated in TiZrHfNb_(0.5) alloy from micro-to nanoscale and progressively segment the BCC grains into nano-scale islands during de-formation,ensuring sustainable strain hardening capability and eventually achieving a substantial 35%uniform tensile *** addition,at 77 K,the tensile strength and uniform elongation of TiZrHfNbx alloys can further be adjusted by a moderate increase of *** results above shed new light on the de-velopment of high-performance refractory HEAs with a high and adjustable strength and ductility com-bination down to the cryogenic temperature.

关键词： Refractory high-entropy alloys Cryogenic temperature Twinning induced plasticity Hierarchical twins Tensile properties

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Influence of the topological Lifshitz transition on the superconductivity of the high-pressure electride Li4Pd

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Physical Review B 2025年第10期111卷 L100505-L100505页

作者： Zhiyao Guan Tian Cui Da Li State Key Lab of Superhard Materials and Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun 130012 People's Republic of China School of Physical Science and Technology Ningbo University Ningbo 315211 People's Republic of China

High-pressure electride (HPE) superconductors often maintain structural symmetry over a wide pressure range, whereas their interstitial anion electrons (IAEs) undergo significant changes in topology and energy levels, potentially resulting in topological Lifshitz transitions in their Fermi surfaces. These Lifshitz transitions can play critical roles in influencing superconducting properties. However, their impact on the superconductivity of HPEs remains largely unexplored. To address this gap, we investigate a novel HPE, Li4Pd, which features distinct Fermi surfaces, including a hole ellipsoid and a warped electron rectangular cylinder. This combination satisfies the conditions for a Kohn anomaly, suggesting that Li4Pd may be a potential HPE superconductor. Our theoretical calculations reveal that under high pressures, the Fermi surface of Li4Pd undergoes a Lifshitz transition that affects the momentum distribution of electrons on the Fermi surface, leading to changes in the energy provided by phonons for forming Cooper pairs. Moreover, this transition modifies the phonon frequencies involved in electron-phonon coupling. The superconducting transition temperature of Li4Pd is calculated to be 34.5 K at 250 GPa, which is comparable to that of Li6P (39.3 K at 270 GPa). Our findings indicate that the formation of closed Fermi surfaces with extended spatial scales is a general feature that could be leveraged to design new classes of high-temperature superconductors among HPEs.

关键词： Fermi surface

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Copper-catalyzed C–C bond cleavage coupling with C≡N bond formation toward mild synthesis of lignin-based benzonitriles

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Journal of Environmental sciences 2025年第5期151卷 505-515页

作者： Qi Luo Shenglong Tian Qian Qiang Fei song Wentao Su Haiyan He Qingda An Changzhi Li Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Science Beijing 100049China

N-participated lignin depolymerization is of great importance for the transformation of waste lignin into value-added *** vast majority of developed strategies employ organic amines as nitrogen source,and considerablemethods rely on excessive use of strong base,which suffers severe environmental ***,benzonitrile derivatives are synthesized from oxidized ligninβ-O-4 model compounds in the presence of solid nitrogen source(NH_(4))_(2)CO_(3)under mild,base-free conditions over commercially available copper *** studies suggest the transformation undergoes a one-pot,highly coupled cascade reaction path involving oxidative C-C bond cleavage and in-situ formation of C≡N *** which,Cu(OAc)2 catalyzes the transfer of hydrogen from C_(β)(C_(β)-H)to C_(α),leading to the cleavage of C_(α)-C_(β)bonds to offer benzaldehyde derivative,this intermediate then reacts in-situ with(NH_(4))_(2)CO_(3)to afford the targeted aromatic nitrile *** iodide(TBAI),acting as a promoter,plays a key role in breaking the C_(α)-C_(β)bonds to form the intermediate benzaldehyde *** this protocol,the feasibility of the production of value-added syringonitrile from birchwood lignin has been *** transformation provides a sustainable approach to benzonitrile chemicals from renewable source of lignin.

关键词： Lignin β-O-4 model compounds Benzonitrile derivatives Copper catalyst Mild conditions

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Low-loading gold in situ doped with sulfur by biomolecule-assisted approach for promoted electrochemical carbon dioxide reduction

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Nano Research 2023年第2期16卷 2059-2064页

作者： Meijie Tan Xiaoqian Han Sen Ru Chao Zhang Zhouru Ji Zhaolin Shi Guomeng Qiao Yunying Wang Ruixue Cui Qiquan Luo Jiqing Jiao Yaguang Li Tongbu Lu MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China College of Materials Science and Engineering State Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266071China Hebei Key Lab of Optic-electronic Information and Materials College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China

For electrochemical carbon dioxide reduction(CO_(2)RR),CO_(2)-to-CO conversion is considered an ideal route towards carbon neutrality for practical ***(Au)is known as a promising catalyst with high selectivity for CO;however,it suffers from high cost and low mass-specific *** this study,we design and prepare a catalyst featuring uniform S-doped Au nanoparticles on N-doped carbon support(denoted as S-Au/NC)by an in situ synthesis strategy using *** S-Au/NC displays high activity and selectivity for CO in CO_(2)RR with a Au loading as low as 0.4 wt.%.The Faradaic efficiency of CO(FECO)for S-Au/NC is above 95%at−0.75 V(***);by contrast,the FECO of Au/NC(without S)is only 58%.The Tafel slope is 77.4 mV·dec−1,revealing a favorable kinetics ***,S-Au/NC exhibits an excellent long-term stability for CO_(2)*** functional theory(DFT)calculations reveal that the S dopant can boost the activity by reducing the free energy change of the potential-limiting step(formation of the*COOH intermediate).This work not only demonstrates a model catalyst featuring significantly reduced use of noble metals,but also establishes an in situ synthesis strategy for preparing high-performance catalysts.

关键词： electrochemical CO_(2)reduction nanocomposites heterogeneous catalyst in situ sulfured heteroatoms

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Edge Passivation:Considerable Improvement in Photovoltaic Performance of Perovskite/Silicon Tandem Solar Cells

Edge Passivation:Considerable Improvement in Photovoltaic Pe...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Bingbing Chen Mengnan Cui Xinru Wang Hao Meng Yuhua Bai Wenheng Li Xiao Wang Xuning Zhang Jianhui Chen Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei University

Edge recombination is considered hard to avoid entirely in silicon（Si） solar cells as well as Si-base solar cells,hindering their future commercialization. However,such an important issue in perovskite/silicon（PK/Si） tandem solar cells have not attracted much ***,a low-temperature,non-vacuum liquid-based edge passivation strategy（LEPS） to improve the power conversion efficiency（PCE） of PK/Si tandem solar cells is proposed. The minority carrier lifetime(τ) of the PK/Si tandem sample with 495.8 μs significantly enhances to 739.7 μs after passivating the Si sub-cell edge *** open circuit voltage(V) of the PK/Si tandem solar cell increases by up to +3.8% abs from the initial state after LEPS treatment due to edge passivation,leading to the PCE of the PK/Si tandem solar cell increases by up to +1.2%***,a monolithic PK/Si tandem cell with a PCE of 29.48% was achieved by further utilizing the LEPS,which opened up a simple and effective avenue for enhancing the PCE of PK/Si tandem solar cells and further promoting a higher photovoltaic output power of tandem modules.

关键词： Passivating edge Perovskite/silicon tandem solar cells lateral surface

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Surface hardness,thermal,optical,and photon attenuation coefficients assessment for dysprosium-doped tellurite glasses

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Journal of Rare Earths 2023年第7期41卷 1083-1090,I0004页

作者： Hesham M.H.Zakaly D.E.Abulyazied H.A.Saudi B.M.Alotaibi Shams A.M.Issa Institute of Physics and Technology Ural Federal UniversityYekaterinburg620002Russia Faculty of Science Al-Azhar UniversityAssuit BranchAssuit71524Egypt Polymer Lab Department of PetrochemicalsEgyptian Petroleum Research InstituteNasr CityCairoEgypt Department of Physics Faculty of ScienceUniversity of TabukTabukSaudi Arabia Physics Department Faculty of ScienceAl-Azhar University(Girls Branch)Nasr CityCairoEgypt Department of Physics College of SciencePrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia

Using a melt-cooling process with the host glass,Dy_(2)O_(3)(1 wt%,2 wt%,3 wt%,and 4 wt%) doped tellurite glasses were produced.A(65-x)TeO_(2)-20B_(2)O_(3)-10Al_(2)O_(3)-SGeO_(2)-xDy_(2)O_(3) glass system was analyzed by Xray *** patterns have a hump at 2θ=27°-29° and no sharp peaks,indicating that all the glass samples are *** Vickers microhardness determines how resistant a glass is to persistent deformation produced by a harder *** scanning calorimetry(DSC) at 300-550℃ was used to evaluate the thermal properties of the Dy_x glass *** glass transition temperature T_g(small endothermic peak),start crystallization temperature T_x and crystallization temperature T_c can all be seen on the DSC thermogram(exothermic peaks).The UV-Vis transmittance and absorption spectra were *** optical data show that the values of E_d^(ir),E_g^(Ind) and E_U decrease as the amount of Dy_(2)O_(3)increases,indicating a narrowing of the tails due to localized states in the forbidden gap.A concentration quenching event occurs when Dy^(3+) concentrations are above a certain threshold(1%).The addition of Dy_(2)O_(3) increases glass density,while the addition of other Dy(Ⅲ) oxides increases sample *** radiation shielding values change as a consequence of density *** sample with the highest amount of Dy_(2)O_(3)(Dy_(4)) has stronger radiation shielding characteristics;hence,it is superior in terms of shielding outcomes at all energy *** Dy_x samples can be used in various forms of ionizing radiation shielding.

关键词： Melt-cooling process DSC Dysprosium(Ⅲ)oxides Surface hardness Photon attenuation Rare earths

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Precise mode control of laser-written waveguides for broadband,low-dispersion 3D integrated optics

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Light(science & Applications) 2024年第6期13卷 1186-1195页

作者： Yuying Wang Lijing Zhong Kuen Yao Lau Xuhu Han Yi Yang Jiacheng Hu Sergei Firstov Zhi Chen Zhijun Ma Limin Tong Kin Seng Chiang Dezhi Tan Jianrong Qiu College of Optical Science and Engineering Zhejiang University310027HangzhouChina Institute of Light+X Science and Technology College of Information Science and EngineeringNingbo University315211NingboChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University215006SuzhouChina Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center38 Vavilov str.Moscow119333Russia Zhejiang Lab 311121HangzhouChina College of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and Technology650093KunmingYunnanChina Department of Electrical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina School of Materials Science and Engineering Zhejiang University310027HangzhouChina

Three-dimensional(3D)glass chips are promising waveguide platforms for building hybrid 3D photonic circuits due to their 3D topological capabilities,large transparent windows,and low coupling *** present,the key challenge in scaling down a benchtop optical system to a glass chip is the lack of precise methods for controlling the mode field and optical coupling of 3D waveguide ***,we propose an overlap-controlled multi-scan(OCMS)method based on laser-direct lithography that allows customizing the refractive index profile of 3D waveguides with high spatial precision in a variety of *** the basis of this method,we achieve variable mode-field distribution,robust and broadband coupling,and thereby demonstrate dispersionless LP21-mode conversion of supercontinuum pulses with the largest deviation of<0.1 dB in coupling ratios on 210 nm *** approach provides a route to achieve ultra-broadband and low-dispersion coupling in 3D photonic circuits,with overwhelming advantages over conventional planar waveguide-optic platforms for on-chip transmission and manipulation of ultrashort laser pulses and broadband supercontinuum.

关键词： waveguide mode dispersion

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Experimental measurement of bipartite entanglement using parameterized quantum circuits

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science China(physics,Mechanics & Astronomy) 2022年第8期65卷 73-84页

作者： Shunzhong Xue Yulei Huang Dafa Zhao Chao Wei Jun Li Ying Dong Jiancun Gao Dawei Lu Tao Xin Gui-Lu Long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen518055China Research Center for Quantum Sensing Zhejiang LabHangzhou311121China Frontier Science Center for Quantum Information Beijing100084China Beijing National Research Center for Information Science and Technology Beijing100084China Beijing Academy of Quantum Information Sciences Beijing100193China

Entanglement in quantum systems plays a crucial role in various quantum information tasks. Measuring entanglement has been an important issue in both experiments and theories. In this work, we use parameterized quantum circuits(PQCs) to diagonalize density matrices of quantum states and obtain entanglement by only measuring the diagonal elements. With this method, full quantum state tomography can be bypassed, greatly reducing the number of measurements. A comprehensive characterization of entanglement was performed by using Rényi entropy and partially transposed moments. Mutual information, calculated from entropy is also used to characterize dynamical quantum phase transitions. We experimentally demonstrated the method on a four-qubit nuclear magnetic resonance quantum simulator. Our results agree with the theoretical descriptions. The measurement complexity of our PQC-based method grows linearly with the number of diagonal elements in the density matrix, a square root reduction over the full quantum tomography. The proposed method can have great potential in quantum systems with a large number of particles.

关键词： quantum information entanglement characterization quantum tomography

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Comparative analysis of several electric propulsion systems that can be used as propulsion systems for mini/micro satellites 4

Comparative analysis of several electric propulsion systems ...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Jiang, Wen-Jia Jian-Ning, Sun Li-Qiu, Wei Shang-Min, Wang Harbin Institute of Technology School of Energy Science and Engineering Harbin China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China

ISBN: (纸本)9781728171494

With the development of technology, combined with the design concept of high integration, integration, modularization, and functional software, some missions that used to be performed by large satellites, such as those used for remote sensing, scientific experiments, and technical verification, has been possible through low-cost, short-cycle, high-performance small satellites and even mini/micro-satellites greatly increased the "functional density. "Under such a background, the commercial space company has an unprecedented development opportunity. In the past, there were no laws and regulations that required satellites to carry derailment devices. Some small satellites could go into orbit without any deorbit devices, which would lead to more space trash. With the introduction of regulatory policies, microsatellites, including CubeSat, are required to install deorbit devices before they enter orbit. Some orbits even require satellites to have the ability of active orbit transfer. Passive deorbit such as the deorbit-sail will be excluded. Therefore, in order to meet the new demand, it is urgent to develop an active orbit transfer system for microsatellites. This paper will take the power as the mainline, analyze several common electric propulsion systems with the parameters of thrust, specific impulse, total impulse, volume, and so on, and then give their applicable conditions. © 2021 IEEE.

关键词： Orbits

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