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52nd IEEE Photovoltaic Specialist Conference, PVSC 2024

作者： Shimasaki, Takashi Watanabe, Kentaroh Sodabanlu, Hassanet Nakano, Yoshiaki Sugiyama, Masakazu The University of Tokyo Department of Electrical Engineering Tokyo1138656 Japan Research Center for Advanced Science and Technology The University of Tokyo Tokyo1538904 Japan

ISBN: (纸本)9781665464260

4-junction solar cells were fabricated by surface activated bonding (SAB) of inverted metamorphic triple-junction solar cells(IMM3J) and In0.53Ga0.47As single junction solar cells. 4- junction solar cells clearly improved Voc compared to IMM3J, ensuring the function as 4-junction solar cells. However, current mismatches between IMM3J and In0.53Ga0.47As, resulting in the decrease of maximum power. Thin type of IMM3J was also tried to relieve the current mismatch, and 4-junciton solar cell composed of thin IMM3J and front hetero junction In0.53Ga0.47As was the closest to the current match condition under AM0 illumination, showing the possibility of application for space. © 2024 IEEE.

关键词： III-V semiconductors

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Multidimensional regulation of Ti-Zr-Cr-Mn hydrogen storage alloys via Y partial substitution

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Nano research 2024年第5期17卷 4211-4220页

作者： Haixiang Xiu Wanqiang Liu Dongming Yin Nan Ding Wenfeng Qiao Shaolei Zhao Long Liang Cong Liu Shaohua Wang Qingshuang Wang Bingbing Chen Limin Wang Yong Cheng School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816China National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China College of Life Science and Technology Changchun University of Science and TechnologyChangchun 130022China

High density and safe storage of hydrogen are the preconditions for the large-scale application of hydrogen ***,the hydrogen storage properties of Ti_(0.6)Zr_(0.4)Cr_(0.6)Mn_(1.4) alloys are systematically studied by introducing Y element instead of Ti element through vacuum arc *** the partial substitution of Y,a second phase of rare earth oxide is added in addition to the main suction hydrogen phase,C14 Laves *** to the unique properties of rare earth elements,the partial substitution of Y can not only improve the activation properties and plateau pressure of the alloys,but also increase the effective hydrogen storage capacity of the *** comprehensive properties of hydrogen storage alloys are improved by multidimensional regulation of rare earth *** them,Ti_(0.552)Y_(0.048)Zr_(0.4)Cr_(0.6)Mn_(1.4) has the best comprehensive *** alloy can absorb hydrogen without activation at room temperature and 5 MPa,with a maximum hydrogen storage capacity of 1.98 wt.%.At the same time,it reduces the stability of the hydride and the enthalpy change value,making it easier to release *** theoretical analysis and first-principle simulation,the results show that the substitution of Y element reduces the migration energy barrier of hydrogen and the structural stability of the system,which is conducive to hydrogen *** alloy has superior durability compared to the original alloy,and the capacity retention rate was 96.79%after 100 hydrogen absorption/desorption cycles.

关键词： AB_(2)-type hydrogen storage alloy rare earth element first-principles simulation multidimensional regulation

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Crystal-Collapse-Induced Synthesis of High-Capacitance LaCoO_(x)/Co-Doped Carbon-Based Supercapacitors

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Transactions of Tianjin University 2025年第1期31卷 29-41页

作者： Zhihao Deng Yuanbo Wang Wu Shao Jingwen He Jie Sheng Ronghao Cen Yufei Fu Wenjun Wu Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Shanghai Key Laboratory of Functional Materials ChemistryFeringa Nobel Prize Scientist Joint Research CenterInstitute of Fine ChemicalsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

The development of high-performance,reproducible carbon(C)-based supercapacitors remains a significant challenge because of limited specific ***,we present a novel strategy for fabricating LaCoO_(x) and cobalt(Co)-doped nanoporous C(LaCoO_(x)/Co@ZNC)through the carbonization of Co/Zn-zeolitic imidazolate framework(ZIF)crystals derived from a PVP-Co/Zn/La *** unique ZIF structure effectively disrupted the graphitic C framework,preserved the Co active sites,and enhanced the electrical *** synergistic interaction between pyridinic nitrogen and Co ions further promoted redox *** addition,the formation of a hierarchical pore structure through zinc sublimation facili-tated electrolyte *** resulting LaCoO_(x)/Co@ZNC exhibited exceptional electrochemical performance,delivering a remarkable specific capacitance of 2,789 F/g at 1 A/g and outstanding cycling stability with 92%capacitance retention after 3,750 *** findings provide the basis for a promising approach to advancing C-based energy storage technologies.

关键词： Supercapacitor High capacitance Carbon electrode Doping Crystal-collapse

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Exceptional catalytic effect of novel rGO-supported Ni-Nb nanocomposite on the hydrogen storage properties of MgH_(2)

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Journal of Materials science & technology 2024年第5期172卷 83-93页

作者： Samuel Guemou Liuting Zhang Shuai Li Yiqun Jiang Tao Zhong Zichuan Lu Ren Zhou Fuying Wu Qian Li School of Energy and Power Instrumental Analysis CenterJiangsu University of Science and TechnologyZhenjiang 212003China National Engineering Research Center for Magnesium Alloys&National Key Laboratory of Advanced Casting Technologies&College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Institute of New Energy Storage Materials and Equipment Chongqing 401135China Max Planck Institute for Iron Research Düsseldorf 40237Germany

The design of an excellent active catalyst to improve the sluggish kinetic and thermodynamic properties of magnesium hydride(MgH_(2))remains a great challenge to achieve its practical *** this study,a novel Ni-Nb/rGO nanocomposite catalyst was successfully prepared by one-spot hydrothermal and sub-sequent calcination *** novel Ni-Nb/rGO nanocomposite exhibits an exceptional catalytic effect on improving MgH_(2) sorption ***,the onset desorption temperature of MgH_(2)+10 wt%Ni-Nb/rGO composite is reduced to 198℃,much lower than that of undoped MgH_(2)(330℃).In-terestingly,the composite can release 5.0,5.9,and 6.0 wt%H_(2) within 10 min at 245,260,and 275℃,***,the dehydrogenated MgH_(2)+10 wt%Ni-Nb/rGO composite starts to absorb hydrogen even at room temperature with approximate 2.75 wt%H_(2) uptake at 75℃under 3 MPa H_(2) pressure within 30 min and exhibits excellent stability by maintaining 6.0 wt%hydrogen content after 20 cycles at 300℃.Chou’s model suggests that the de/hydrogenation kinetics of Ni-Nb/rGO-modified MgH_(2) switches from surface penetration model to diffusion model at lower ***,the ac-tivation energies(E a)for the de/hydrogenation of MgH_(2)+10 wt%Ni-Nb/rGO are reduced to 57.8 kJ/mol and 33.9 kJ/mol,which are significantly lower than those of undoped MgH_(2).The work demonstrates that the addition of a novel ternary Ni-Nb/rGO catalyst is an effective strategy to not only boost the sorption kinetics of MgH_(2) but also maintain its cycling property.

关键词： Hydrogen storage materials Magnesium hydride Ni-Nb/rGO Kinetic analysis Catalytic mechanism

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Suppressed concentration quenching and tunable photoluminescence in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2) phosphors for full-spectrum lighting

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Light(science & Applications) 2024年第11期13卷 2688-2698页

作者： Ming Zhao Yeping Ge Yurong Li Xiaoyan Song Zhiguo Xia Xinping Zhang Institute of Information Photonics Technology School of Physics and Optoelectronic EngineeringBeijing University of TechnologyBeijing 10083China College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 10083China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Physics and OptoelectronicsSouth China University of TechnologyGuangzhou 510641China

Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources,and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield(PLQY).However,the constraint of concentration quenching poses a great challenge for improving the ***,we propose a fundamental design principle by separating activators and prolonging their distance in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2)phosphors to inhibit concentration quenching,in which different quenching rates are controlled by the Eu distribution at various crystallographic *** blue-violet-emitting Rb_(3)Y(PO_(4))2:xEu(x=0.1%–15%)phosphors,with the occupation of Rb1,Rb2 and Y sites by Eu^(2+),exhibit rapid luminescence quenching with optimum external PLQY of 10%due to multi-channel energy ***,as the Eu concentration increases above 20%,Eu^(2+)prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances,resulting in green emission with suppressed concentration quenching,achieving an improved external PLQY of 41%.Our study provides a unique design perspective for elevating the efficiency of Eu^(2+)-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

关键词： quenching lighting concentration

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Consciously drifting: Exploratory design practices that embrace influences from local community 24

Consciously drifting: Exploratory design practices that embr...

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18th Biennial Participatory Design Conference - Reaching Out: Connecting Beyond Participation, PDC 2024

作者： Akasaka, Fumiya Sakakura, Kyosuke Miki, Yuko Human Augmentation Research Center National Institute of Advanced Industrial Science and Technology Japan Faculty of Urban Studies Tokyo City University Japan

ISBN: (纸本)9798400706547

The practice of Community-Based Co-Design (CBCD) strongly depends on the relationship with local communities. This study draws attention to the encounters and engagement with a local community, often framed as backstage activities in a CBCD, and explores how CBCD practices are shaped through complex and contingent relationships with the local community. In this study, we describe our experiences and reflections from a long-term CBCD practice in a local residential area in Tokyo. Based on the case, we argue for the importance of "consciously drifting,"a design approach that emphasizes the oscillation between passive drifting and active exploration through the entire engagement with local community. Consciously drifting requires a mindset that is open to and ready to respond to new possibilities for designing by actively and positively embracing the influences from a local community throughout the entire engagement with the community. © 2024 Owner/Author.

关键词： Design

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Dielectric Patch Resonator and Antenna

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China Communications 2023年第8期20卷 209-219页

作者： Jianxin Chen Xueying Wang Shichang Tang Yongle Wu School of Information Science and Technology and Research Center for Intelligent Information TechnologyNantong UniversityNantong 226019China Nantong Research Institute for Advanced Communication Technologies Chongchuan DistrictNantong 226019China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

This paper presents an overview of dielectric patch(DP)antennas developed in recent *** employed DP resonator composed of a DP and a bottom substrate is analyzed comprehensively here,enabling the easy realization of a quasi-planar DP *** combines the dual advantages of the conventional microstrip patch(MP)antenna and dielectric resonator(DR)antenna in terms of profile,gain,bandwidth,radiation efficiency,and design ***,the DP antenna inherits the multi-mode characteristic of the DR antenna,thus it has a large number of high-order modes,including TMmn mode and TEmn *** high-order modes are widely applied,for example,by combining with the dominant TM10 mode to expand the bandwidth,or selecting multiple higher-order modes to implement a high-gain ***,the non-radiation high-order modes are also utilized to produce natural radiation null in filtering antenna *** this paper,the design theories and techniques of DP antenna are introduced and investigated,including calculation and control methods of the resonant mode frequencies,analysis of the radiation mechanism,and applications of the multi-mode *** overview could provide guidance for the subsequent antenna design,thus effectively avoid time-consuming optimization.

关键词： dielectric patch(DP)resonator DP antenna radiation mechanism multi-mode characteristic

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Meter-scale geologic heterogeneity in the near surface explains seismic speckle scattering noise

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Leading Edge 2023年第10期42卷 683-693页

作者： Bakulin, Andrey Ramdani, Ahmad Neklyudov, Dmitry Silvestrov, Ilya Saudi Aramco EXPEC Advanced Research Center Dhahran Saudi Arabia Ali Al-Naimi Petroleum Engineering Research Center King Abdullah University of Science and Technology Saudi Arabia Institute of Petroleum Geology and Geophysics SB RAS Novosibirsk Russia

Complex scattering in the near surface can introduce significant distortions in deep reflection data. To model and explain these effects, a multiplicative random noise model based on the speckle mechanism of small-scale scattering has been proposed. While this model effectively captures the observed phenomena in field data, it has been considered rather abstract as it relies on random mathematical clutter to replicate the distortions. This study goes beyond by delving into the analysis of the actual meter-scale geologic heterogeneity found in carbonate formations from desert environments. By employing elastic wave propagation simulations, we show that geologic heterogeneity is equally capable of generating the observed speckle noise in field data when compared to idealized mathematical clutter. Our simulations reveal that the phase perturbations exhibit a quasi-random nature and follow a symmetric near-normal distribution, thereby supporting the validity of the multiplicative noise model and aligning with field observations. Furthermore, we discover that the spread or standard deviation of phase perturbations increases with frequency. This finding provides a plausible explanation for the loss of higher frequencies commonly seen in our data. By considering the complex waveform distortions induced by near-surface heterogeneity, our new noise model represents a significant advancement over residual statics that only account for the kinematic aspect. In summary, our study shows that geologic heterogeneity can easily generate the speckle noise observed in field data. The complex waveform distortions can be captured using quasi-random phase perturbations, as the multiplicative noise model outlines. This advancement leads to a more comprehensive understanding of the influence of near-surface heterogeneity on seismic data. Consequently, this understanding serves as a foundation for despeckling deep reflection data and enhancing the resolution of seismic imaging. These findi

关键词： Normal distribution

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Efficient anisotropic Migdal-Eliashberg calculations with an intermediate representation basis and Wannier interpolation

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Physical Review B 2024年第6期110卷 064505-064505页

作者： Hitoshi Mori Takuya Nomoto Ryotaro Arita Elena R. Margine Department of Physics Applied Physics and Astronomy 2-1 Hirosawa Wako 351-0198 Japan Research Center for Advanced Science and Technology Department of Physics

In this study, we combine the ab initio Migdal-Eliashberg approach with the intermediate representation of the Green's function, enabling accurate and efficient calculations of the momentum-dependent superconducting gap function while fully considering the effect of the Coulomb retardation. Unlike the conventional scheme that relies on a uniform sampling across Matsubara frequencies, demanding hundreds to thousands of points, the intermediate representation works with fewer than 100 sampled Matsubara Green's functions. The developed methodology is applied to investigate the superconducting properties of three representative low-temperature elemental metals: aluminum, lead, and niobium. The results demonstrate the power and reliability of our computational technique to accurately solve the ab initio anisotropic Migdal-Eliashberg equations even at extremely low temperatures below 1 K.

关键词： Electron-phonon coupling Superconducting gap Superconductivity Low-temperature superconductors Eliashberg theory First-principles calculations Green's function methods Methods in superconductivity

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Enhanced electrical property of graphite/Al_(2)O_(3) composite fabricated by reductive sintering of gel-casted body using cross-linked epoxy polymer

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Journal of advanced Ceramics 2022年第4期11卷 523-531页

作者： Yoshiaki FUNAHASHI Yunzi XIN Kunihiko KATO Huu Hien NGUYEN Takashi SHIRAI Department of Life Science and Applied Chemistry Graduate School of EngineeringNagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan Advanced Ceramics Research Center Nagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan

In the present study,graphite/alumina composites are fabricated via reductive sintering of gel-casted green bodies with structurally controlled cross-linked epoxy polymers for the first *** cross-linking degrees of polymers are tuned by the amount ratio of epoxy monomer/polyvinyl alcohol cross-linker utilized in gel-casting *** electrical properties with respect to 5-fold enhanced electrical conductivity and 2-fold higher carrier mobility are successfully achieved in graphite/alumina composite fabricated from cross-linked epoxy polymer,whose phenomenon is attributed to the excellent conductive path in ceramic matrix established by highly uniform network with improved graphitization degree.

关键词： ceramic composite gel-casting reductive sintering cross-linking electrical property graphitization

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