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New muonic He atom HFS measurements at J-PARC MUSE

Interactions 2024年第1期245卷 1-6页

作者： Goto, Yu Fukumura, Seiso Strasser, Patrick Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Department of Physics Nagoya University Nagoya Japan Tsukuba Japan Materials and Life Science Division J-PARC Center Tokai Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI Tsukuba Japan Kobayashi-Maskawa Institute Nagoya University Nagoya Japan Tokai Japan Graduate School of Science and Engineering Ibaraki University Mito Japan School of Science The University of Tokyo Tokyo Japan

Muonic He (μHe) is a hydrogen-like atom composed of a helium atom with one of its electrons replaced by a negative muon. Measurements of the ground-state hyperfine structure (HFS) interval of the μHe atom is a sensitive tool to test the three-body atomic system, bound-state quantum electrodynamics (QED) theory, and determine fundamental constants of the negative muon magnetic moment and mass. It allows a test of the CPT theorem in muons by comparing these constants with positive muons. Precise measurements of the ground-state HFS interval using a microwave magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration. Furthermore, a new experimental approach to recover the muon polarization lost during the muon cascade process is being investigated by repolarizing μHe atoms using a spin-exchange optical pumping (SEOP) technique. The first laser repolarization experiment was recently performed. An overview of the different features of these new μHe atom HFS measurements and the latest results are presented. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Atoms

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Precision measurements of muonium and muonic helium hyperfine structure at J-PARC

arXiv

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arXiv 2025年

作者： Strasser, Patrick Abe, Mitsushi Asai, Kanta Fukumura, Seiso Fushihara, Mahiro Goto, Yu Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Powell, Adam Sasaki, Ken-Ichi Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Yamanaka, Takashi Yamazaki, Takayuki 1-1 Oho Ibaraki Tsukuba305-0801 Japan Materials and Life Science Division J-PARC Center 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI 1-1 Oho Ibaraki Tsukuba305-0801 Japan 1-1 Oho Ibaraki Tsukuba305-0801 Japan Graduate School of Science Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Department of Physics Niigata University 8050 Ikarashi 2-no-cho Nishi-ku Niigata-shi Niigata950-2181 Japan Facility for Rare Isotope Beams Michigan State University 640 South Shaw Lane East LansingMI48824 United States Kobayashi-Maskawa Institute Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Graduate School of Science and Engineering Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Faculty of Arts and Science Kyushu University 744 Motooka Nishi Fukuoka819-0395 Japan

At the J-PARC Muon science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world’s most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. Copyright © 2025, The Authors. All rights reserved.

关键词： Microwave spectroscopy

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Perspective on the perovskite quantum dots for flexible photovoltaics

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Journal of Energy Chemistry 2021年第11期30卷 505-507,I0011页

作者： Jiabei Yuan Nopporn Rujisamphan Wanli Ma Jianyu Yuan Youyong Li Shuit-Tong Lee Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123JiangsuChina Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina Nanoscience and Nanotechnology Graduate Program Faculty of ScienceKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand

Owing to the ever-increasing charging demand for portable electronics,display devices and wearable electronic textiles,flexible and lightweight solar cells are highly urgent to be ***-generation solution-processable photovoltaic(PV)devices attracted great attentions due to their unique properties of low-cost,lightweight,and large-area printing compatibility with flexible substrates[1].

关键词： printing perovskite compatibility

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Loss Allocation in AC OPF-Based Financial Transmission Rights Auction Models

Loss Allocation in AC OPF-Based Financial Transmission Right...

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North American Power Symposium (NAPS)

作者： Alburidy, Abdullah Fan, Lingling Taiwan International Graduate Program Academia Sinica and National Taiwan University Taiwan Department of Materials Science and Engineering National Chung Hsing University Taichung Taiwan

ISBN: (纸本)9781538626993

This paper presents two models of AC optimal power flow based Financial Transmission Rights (FTRs) allocation auction. Both models were compared with the conventional DC optimal power flow (DC-OPF) based model. Considering an FTR between two nodes as a real power injection at the source node and a power withdrawal at the sink node;the first model assumes that the net power due to FTRs equals zero. FTRs do not consider loss and the slack node is compensating for the total system losses. In the second model, it is suggested that each FTR's source node is taking care of a portion of the system loss by introducing a power injection. The portion of loss compensation is proportional to each FTR allocated amount, i.e., if one FTR is to use the grid more, then it should compensate more for the loss. To show the validity of all models and the advantages of the new suggested model, numerical examples of a 3-bus system and the IEEE 14-bus system are presented. All results are compared and explained.

关键词： Financial Transmission Rights FTR Allocation auction considering loss DCOPF ACOPF MATLAB Optimization Toolbox fmincon

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Excitations in layered materials from a non-empirical Wannier-localized optimally-tuned screened rangeseparated hybrid functional

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npj Computational materials 2024年第1期10卷 132-140页

作者： María Camarasa-Gómez Stephen E.Gant Guy Ohad Jeffrey B.Neaton Ashwin Ramasubramaniam Leeor Kronik Department of Molecular Chemistry and Materials Science Weizmann Institute of ScienceRehovoth7610001Israel Department of Physics University of CaliforniaBerkeleyCA94720USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Kavli Energy NanoSciences Institute at Berkeley University of CaliforniaBerkeleyCA94720USA Department of Mechanical and Industrial Engineering University of Massachusetts AmherstAmherstMA01003USA Materials Science and Engineering Graduate Program University of MassachusettsAmherstAmherstMA01003USA

Accurate prediction of electronic and optical excitations in van der Waals(vdW)materials is a long-standing challenge for density functional *** recent Wannier-localized optimally-tuned screened range-separated hybrid(WOT-SRSH)functional has proven successful in non-empirical determination of electronic band gaps and optical absorption spectra for covalent and ionic ***,for vdW materials the tuning of the material-and structure-dependent functional parameters has only been attained ***,we present a non-empirical WOT-SRSH approach applicable to vdW materials,with the optimal functional parameters transferable between monolayer and *** apply this methodology to prototypical vdW materials:black phosphorus,molybdenum disulfide,and hexagonal boron nitride(in the latter case including zero-point renormalization).We show that the WOT-SRSH approach consistently achieves accuracy levels comparable to experiments and many-body perturbation theory(MBPT)calculations for band structures and optical absorption spectra,both on its own and as an optimal starting point for MBPT calculations.

关键词： theory optimal functional

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Nanostethoscopy: Atomic force microscopy probe contact force versus measured amplitude of cardiomyocytic contractions

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Journal of Bionanoscience 2017年第4期11卷 319-322页

作者： Vyas, Varun Nagarajan, Neerajha Zorlutuna, Pinar Huey, Bryan D. Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Aerospace and Mechanical Engineering Bioengineering Graduate Program University of Notre Dame Notre DameIN46556 United States

Cardiomyocytes are one of the most active cells in the human body. Understanding their mechanical contractions via nanostethoscopy has given us better insight into the subtleties of contractions. There is extensive data available on the temporal behavior of contraction in a cardiomyocytes but little is known about how contact force of the AFM probe influences the measurement force of contractions i.e., mean beat force. This investigation suggests that in order to accurately measure mean beat force nanostethoscopy data should be analyzed from the lowest to the highest contact force. In this study optimal contact force was varied from 10 nN to 500 nN and it was observed that the maximum contraction i.e., mean beat force was highest at contact force of 250 nN. © 2017 American Scientific Publishers.

关键词： Atomic force microscopy

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LZS/Al2O3 glass-ceramic composites sintered by fast firing

LZS/Al2O3 glass-ceramic composites sintered by fast firing

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作者： Arcaro, Sabrina Nieto, Maria Isabel Moreno, Rodrigo Salvador, Maria Dolores Borrell, Amparo Moreno, Berta Chinarro, Eva De Oliveira, Antonio Pedro Novaes Laboratory of Glass-Ceramic Materials VITROCER Federal University of Santa Catarina - UFSC Florianópolis SC88040-900 Brazil Graduate Program in Materials Science and Engineering - PGMAT Federal University of Santa Catarina - UFSC Florianópolis SC88040-900 Brazil Institute of Ceramics and Glass - CSIC Madrid Spain Institute of Materials Technology Polytechnic University of Valencia Spain

In this work, nanometric Al2O3 (1-5 vol.%) particles (13 nm, 100 m2/g) were added to a 19.58Li2O•11.10ZrO2•69.32SiO2 (mol%) (3.5 µm, 2.5 m2/g) parent glass-ceramic matrix to prepare composites with the purpose of studying the influence of Al2O3 on their structure, microstructure, mechanical, thermal and electrical properties when sintered by fast firing. The parent glass-ceramic was prepared by melting and fast cooling (in water) to obtain a glass frit. The resulting glass frit was milled according to a two-step procedure consisting on a dry milling stage followed by a long wet milling step down. Each composition was wet homogenized and then dried at 110 ºC for 48 h for disaggregation. The obtained powders were uniaxially pressed (100 MPa) and compacts sintered by fast firing (175 ºC/min) between 800 and 900 ºC for 30 min. The composites, with relative densities ranging from 89% to 93%, showed zircon and β-spodumene as main crystalline phases. The hardness and Young's modulus varied from 4.5 to 6.5 GPa, and from 65 to 102 GPa, respectively. The formation of β-spodumene in the obtained composites leads to reduce the CTEs, whose values ranged from 13 to 7 x 10-6 ºC-1 © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Sintering

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Development of a Tricalcium Silicate-Based Endodontic Repair Cement with ZnO: Evaluation of Radiopacity, Setting Behavior, and Cytotoxicity

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Ceramics International 2025年

作者： Giovane Augusto de Abreu Betinelli Anarela Bernardi Vassen Fabiano Raupp-Pereira Oscar Rubem Klegues Montedo Manuel Joaquim Ribeiro Tiago Bender Wermuth Sabrina Arcaro Graduate Program in Materials Science and Engineering (PPGCEM) Biomaterials and Nanostructured Materials Group Technical Ceramics Laboratory (CerTec) Universidade do Extremo Sul Catarinense (UNESC) 88806-000 Criciúma SC Brazil ProMetheus-Research Unit in Materials Energy and Environment for Sustainability Polytechnic Institute of Viana do Castelo (IPVC) Rua Escola Industrial e Comercial de Nun'Álvares Viana do Castelo Portugal

Calcium silicate-based cements are widely used in endodontics owing to their bioactive characteristics that stimulate tissue regeneration. However, finding an ideal material that meets the requirements of the physicochemical, mechanical, and biological properties for filling materials used in endodontics remains a significant challenge. This study aims to evaluate the physicochemical, mechanical and cytotoxic properties of a new nanostructured biocement based on tricalcium silicate (C 3 S) containing 20, 25, or 30 wt% ZnO synthesised through combustion at 600 ºC and subsequent heat-treatment at 1000 ºC. The C 3 S phase of the monoclinic polymorph, which is the most reactive among the available polymorphs, formed alongside a minority phase of dicalcium silicate. The concentrations were tested for setting time (Vicat), radiopacity (X-rays), endodontic flow (ISO 6876), compressive strength (ISO 9917), and antimicrobial activity using toxicity profiles (MTT). A complete characterisation of the crystal structure, functional groups, and morphology of the biocement was performed. The results indicate that the C 3 S-20% ZnO sample exhibits ideal characteristics for endodontic repairs with a short setting time (8.5 min), non-toxic cell viability in murine fibroblasts at concentrations of up to 25 wt% ZnO, and low endodontic flow (Ø=18.03 mm). These findings suggest that this new biomaterial can significantly improve endodontic treatments and contribute to advances in biomedicine. Future rheological research on biomaterials and animal models is essential to better understand their flow and interactions with biological tissues, broadening their clinical applicability.

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Stacking-fault networks with Lomer-Cottrell locks induced by carbon addition in a severely strained Cr-Co-Ni alloy

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Journal of Alloys and Compounds 2025年 1033卷

作者： Guilherme Cardeal Stumpf Gustavo Bertoli Francisco Gil Coury Augusta Cerceau Isaac Neta Luciano Andrey Montoro Roberto Braga Figueiredo Witor Wolf Graduate Program in Metallurgical Materials and Minning Engineering Federal University of Minas Gerais Belo Horizonte MG 31270-901 Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos Rod. Washington Luiz Km 235 São Carlos SP 13565-905 Brazil Department of Materials Engineering Federal University of São Carlos São Carlos SP 13565-905 Brazil Department of Metallurgical and Materials Engineering Federal University of Minas Gerais Av. Antônio Carlos 6627 Belo Horizonte MG 31270-901 Brazil Department of Chemistry Federal University of Minas Gerais Av. Antônio Carlos 6627 Belo Horizonte MG 31270-901 Brazil Department of Materials Engineering São Carlos School of Engineering University of São Paulo (EESC–USP) São Carlos SP 13563-120 Brazil

Face-centered cubic (FCC) Cr-Co-Ni multi-principal element alloys are among the toughest materials ever designed. The optimal trade-off between strength and ductility shown by these materials is tied with their deformation evolution. Typically, their plastic deformation starts with dislocation slip, followed by mechanical twinning (i.e., twinning induced plasticity, TWIP) and, as strain levels further increase, phase transformation induced by plasticity (TRIP). This work evaluates the deformation substructure of a highly strained (achieved with high-pressure torsion) Cr 40 Co 30 Ni 30 (at%) alloy with and without carbon alloying. After processing, the carbon-free alloy developed a typical substructure observed in FCC Medium/High-entropy alloys at later stages of straining, characterized by the presence of nanotwins and HCP lamellae, resulting in a 5.9 GPa hardness. In contrast, carbon addition induced grain refinement and suppression of the TWIP and TRIP effects. Notably, the Cr 39.6 Co 30 Ni 30 C 0.4 alloy developed networks of stacking faults with partial dislocations and Lomer-Cottrell locks, which primarily contributed to a stronger hardening capability, resulting in an increased hardness of 7.3 ± 0.8 GPa, 22 % (1.3 GPa) higher than the base alloy. These findings have important implications for better understanding the deformation substructure evolution of FCC multi-principal element alloys and can pave the way forward in regard to the design approaches for carbon-alloying in these materials.

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Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach

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Nano Research 2017年第9期10卷 3077-3091页

作者： Zhenxing Yin Seung Keun Song Sanghun Cho Duck-Jae You Jeeyoung Yoo Suk Tai Chang Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 08826 Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University Seou106974 Republic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-ro Yeongtong-gu Suwon-si Gyeonggi-do 16229 Republic of Korea

Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (R s = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R 0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (R rms = 14.36 nm).

关键词： curved Cu nanowires all-solution processes 20 μm patterns high performance transparent electrode

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