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SSRN 2022年

作者： Zhang, Dian Kanezashi, Masakoto Tsuru, Toshinori Yamamoto, Kazuki Gunji, Takahiro Adachi, Yohei Ohshita, Joji Smart Innovation Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8527 Japan Chemical Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8527 Japan Department of Pure and Applied Chemistry Faculty of Science and Technology Tokyo University of Science Chiba278-8510 Japan Education and Research Center Hiroshima University Higashi-Hiroshima739-0046 Japan

Reverse osmosis (RO) membranes with polysilsesquioxane (PSQ) framework having high NaCl rejection and favorable resistance to heat and chlorine were prepared by the copolymerization of 3-glycidyloxypropyl-POSS (GPOSS) and bis[3-(triethoxysilyl)propyl]amine (BTESPA). It was found that NaCl rejection and liquid permeability were significantly improved by the introduction of GPOSS-derived units to the BTESPA-based membranes, yielding NaCl rejection of approximately 99% and liquid permeability of 5.5 × 10 -13 m/s·Pa. These PSQ RO membranes with GPOSS-derived units also demonstrated excellent resistance to heat treatment of up to 100 °C and favorable resistance to chlorine in that no obvious RO performance change was observed after exposure to NaOCl aqueous solution (1000 ppm) for 10 h. © 2022, The Authors. All rights reserved.

关键词： Desalination

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Eu3+ Doped Na2O-Gd2O3-BaO-B2O3-P2O5 glasses for x-ray scintillator application

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Optik 2023年 292卷

作者： Khrongchaiyaphum, F. Wantana, N. Kansirin, S. Pakawanit, P. Vittayakorn, N. Kothan, S. Chanthima, N. Kim, H.J. Kaewkhao, J. Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Synchrotron Research and Applications Division 111 University Avenue Muang District Nakhon Ratchasima30000 Thailand Advanced Materials Research Unit School of Science King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand

The Na2O-BaO-B2O3-P2O5 doped with varying concentrations of Gd2O3 and Na2O-Gd2O3-BaO-B2O3-P2O5 glasses were doped with varying concentrations of Eu2O3 (referred to as Eu:NGBaPB) and prepared using the melt-quenching technique. These glasses were analyzed comprehensively in the physical, optical, chemical groups and photo-/radio- luminescence properties. Furthermore, the X-ray imaging was operated to indicate the practical radiation detection of glass. The addition of Eu2O3, the density and refractive index of Eu:NGBaPB glasses increased, while the molar volume decreased. The glass exhibited photon absorption in the UV-NIR regions. Excitation from various sources such as X-ray, ultraviolet, and visible light resulted in a reddish-orange emission at approximately 613 nm, originating from the 5D0→7F2 radiation state of Eu3+. Energy transfer occurred from Gd3+ to Eu3+ within the glass. These findings highlight the intriguing potential of the glass for applications as an X-ray scintillator. © 2023 Elsevier GmbH

关键词： Energy transfer

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Observation of possible excitonic charge density waves and metal-insulator transitions in atomically thin semimetals

arXiv

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arXiv 2024年

作者： Gao, Qiang Chan, Yang-Hao Jiao, Pengfei Chen, Haiyang Yin, Shuaishuai Tangprapha, Kanjanaporn Yang, Yichen Li, Xiaolong Liu, Zhengtai Shen, Dawei Jiang, Shengwei Chen, Peng Shenyang National Laboratory for Materials Science Shanghai Center for Complex Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China College of Engineering International Advanced Technology Program National Taiwan University of Science and Technology Taiwan Chinese Academy of Sciences Shanghai200050 China National Synchrotron Radiation Laboratory University of Science and Technology of China 42 South Hezuohua Road Hefei Anhui230029 China

Charge density wave (CDW) is a collective quantum phenomenon with a charge modulation in solids1-2. Condensation of electron and hole pairs with finite momentum will lead to such an ordered state3-7. However, lattice symmetry breaking manifested as the softening of phonon modes can occur simultaneously, which makes it difficult to disentangle the origin of the transition8-14. Here, we report a condensed phase in low dimensional HfTe2, whereas angle-resolved photoemission spectroscopy (ARPES) measurements show a metal-insulator transition by lowering the temperature in single triatomic layer (TL) HfTe2. A full gap opening, renormalization of the bands, and emergence of replica bands at the M̅ point are observed in the low temperatures, indicating formation of a CDW in the ground state. Raman spectroscopy shows no sign of lattice distortion within the detection limit. The results are corroborated by first-principles calculations, demonstrating the electronic origin of the CDW. By adding more layers, the phase transition is suppressed and completely destroyed at 3 TL because of the increased screening around the Fermi surface. Interestingly, a small amount of electron doping in 1 TL film during the growth significantly raises the transition temperature (TC), which is attributed to a reduced screening effect and a more balanced electron and hole carrier density. Our results indicate a CDW formation mechanism consistent with the excitonic insulator phase in low dimensional HfTe2 and open up opportunity for realization of novel quantum states based on exciton condensation. © 2024, CC BY.

关键词： Metal insulator transition

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Wave mixing and high-harmonic generation enhancement by a two-color field driven dielectric metasurface[Invited]

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Chinese Optics Letters 2021年第12期19卷 124-129页

作者： Weifeng Yang Yichong Lin Xueyi Chen Yuxuan Xu Hongdan Zhang Marcelo Ciappina Xiaohong Song School of Science Hainan UniversityHaikou 570228China Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Institute of Mathematics Shantou UniversityShantou 515063China Physics Program Guangdong Technion-Israel Institute of TechnologyShantou 515063China Technion-Israel Institute of Technology Haifa 32000Israel

High-harmonic generation in metasurfaces,driven by strong laser fields,has been widely *** to plasma,all-dielectric nanoscale metasurfaces possess larger nonlinearity response and higher damage ***,it can strongly localize the driven field,greatly enhancing its peak *** this work,we adopt a Fano resonant micronano structure with transmission peaks at different wavelengths and explore its nonlinear response by both single and twocolor pump *** to the high-order harmonics induced by the first resonant wavelength,the intensity of the high-harmonic radiation results is enhanced by one order of magnitude,when the metasurface is driven by various resonant and non-resonant wavelength combinations of a two-color field.

关键词： metamaterial nanostructure Fano resonance high-harmonic generation two-color field

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Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals

arXiv

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arXiv 2024年

作者： Guo, Qiangbing Wu, Yun-Kun Zhang, Di Zhang, Qiuhong Guo, Guang-Can Alù, Andrea Ren, Xi-Feng Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Centre for Advanced 2D Materials Graphene Research Centre National University of Singapore Singapore Singapore CAS Key Laboratory of Quantum Information CAS Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei China Hefei National Laboratory University of Science and Technology of China Hefei China Photonics Initiative Advanced Science Research Center City University of New York New York United States Physics Program Graduate Center City University of New York New York United States The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics TEDA Applied Physics Institute Nankai University Tianjin China School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China

Polarization entanglement holds significant importance for photonic quantum technologies. Recently emerging subwavelength nonlinear quantum light sources, e.g., GaP and LiNbO3 thin films, benefiting from the relaxed phase-matching constraints and volume confinement, has shown intriguing properties, such as high-dimensional hyperentanglement and robust entanglement anti-degradation. Van der Waals (vdW) NbOCl2 crystal, renowned for its superior optical nonlinearities, has emerged as one of ideal candidates for ultrathin quantum light sources [Nature 613, 53 (2023)]. However, polarization-entanglement is inaccessible in NbOCl2 crystal due to its unfavorable nonlinear susceptibility tensor. Here, by leveraging the twist-stacking degree of freedom inherently in vdW systems, we showcase the preparation of tunable polarization entanglement and quantum Bell states. Our work not only provides a new and tunable polarization-entangled vdW photon-pair source, but also introduces a new knob in engineering the entanglement state of quantum light at the nanoscale. © 2024, CC BY-NC-ND.

关键词： Van der Waals forces

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Dynamic Radio Map Using Statistical Hypothesis Testing

Dynamic Radio Map Using Statistical Hypothesis Testing

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作者： Katagiri, Keita Sato, Koya Inage, Kei Fujii, Takeo Advanced Wireless and Communication Research Center University of Electro-Communications Tokyo182-8585 Japan Department of Electrical Engineering Tokyo University of Science Tokyo125-8585 Japan Electrical and Electronics Engineering Program Tokyo Metropolitan College of Industrial Technology Tokyo140-0011 Japan

Private fifth-generation mobile communication networks (5G) have garnered considerable attention for providing various communication services. In private 5G systems, such as those employed in smart factories, it is necessary to appropriately manage the interference power among diverse systems because each nonpublic operator deploys a gNodeB in the local area and utilizes a similar allocated frequency. Several researchers have discussed the use of a radio map, which stores the spatial distribution of received signal power values as a tool for managing intra-system interference. Radio maps are typically applied to television white space, where the location of the base station (BS) is fixed and the average value of the received signal power exhibits time-invariant characteristics. However, in private 5G networks, the estimation accuracy using a conventional radio map is lowered because the location of the BS may be changed when the factory is rearranged. In this study, a database server is used to infer a significant difference in the average values of the received signal power by means of Welch's ${t}$ -test;the server then updates the radio map based on the test results. The simulation results indicate that the proposed method can detect changes in the BS location and update the radio map accurately. © 2015 IEEE.

关键词： 5G mobile communication systems

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Fabrication of PSf/P84-blended membranes with low P84 content: Characteristics and gas separation performance

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Case Studies in Chemical and Environmental Engineering 2024年 10卷

作者： Kayadoe, Victor Widiastuti, Nurul Gunawan, Triyanda Salleh, Wan Norhayati Wan Fansuri, Hamzah Romadiansyah, Taufik Qodar Pratama, Agus Wedi Department of Chemistry Faculty of Science and Data Analytical Institut Teknologi Sepuluh Nopember Chemistry Education Study Program Faculty of Teacher Training and Educational Pattimura University School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Advanced Membrane Technology Research Center (AMTEC) Universiti Teknologi Malaysia

The demand for efficient and sustainable gas separation technologies is ever-increasing in various industries, including petrochemicals, natural gas processing, and carbon capture. Polymer-based membranes offer a promising solution due to their potential for high selectivity and energy efficiency. However, achieving optimal gas separation performance often requires overcoming the limitations of individual polymers through modifications such as polymer blending. In this study, PSf/P84 blended membranes with low P84 content were fabricated using the phase separation technique with a mixture of N-methyl-2-pyrrolidone and tetrahydrofuran as solvents. The effect of varying the mass ratio of PSf to P84 on membrane characteristics and gas separation performance was investigated. Characterization techniques included FTIR, XRD, SEM, TGA, Water Contact Angle (WCA) measurement, and mechanical property testing. Gas permeation tests were conducted with single gases at room temperature and 1 bar pressure. The results revealed that the addition of P84 increased membrane thickness, Young's modulus, and thermal stability, while decreasing d-spacing, dense layer thickness, hydrophilicity, tensile strength, and elongation. The F_index values, indicating the competence of the blended membranes compared to the ideal quality, demonstrated the positive impact of P84 addition on gas separation performance compared to pure PSf membranes. The optimal gas separation selectivity was achieved with the PSf/P84 1:0.025 blended membrane for H₂/CH₄ (11.28, 58 % increase), H₂/CO₂ (6.25, 193 % increase), and H₂/N₂ (5.25, 35 % increase). The highest N₂/CH₄ selectivity (6.29, 253 % increase) was observed with the 1:0.10 composition. Regarding commercially relevant separations based on the 2008 Robeson curve, the PSf/P84 1:0.20 blend showed promise for H₂/CO₂ separation, while the 1:0.

关键词： Findex Low P84 content PSf/P84 blended membrane Robeson curve

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Recent advances in genome-scale engineering in Escherichia coli and their applications

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Engineering Microbiology 2024年第1期4卷 28-38页

作者： Hui Gao Zhichao Qiu Xuan Wang Xiyuan Zhang Yujia Zhang Junbiao Dai Zhuobin Liang Institute of Molecular Physiology Shenzhen Bay LaboratoryShenzhen 518132China CAS Key Laboratory of Quantitative Engineering Biology Guangdong Provincial Key Laboratory of Synthetic Genomics and Shenzhen Key Laboratory of Synthetic Genomics.Shenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Regenerative Medicine Program Bellvitge Institute for Biomedical Research(IDIBELL)and Program for Clinical Translation of Regenerative Medicine in Catalonia(P-CMRC)L’Hospitalet de LlobregatBarcelona 08908Spain Faculty of Pharmacy and Food Science Barcelona UniversityBarcelona 08028Spain College of Life Sciences Northwest A&F UniversityShaanxi 712100China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureKey Laboratory of Synthetic BiologyMinistry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China

Owing to the rapid advancement of genome engineering technologies,the scale of genome engineering has expanded *** editing has progressed from one genomic alteration at a time that could only be employed in few species,to the simultaneous generation of multiple modifications across many genomic loci in numerous *** development and recent advances in multiplex automated genome engineering(MAGE)-associated technologies and clustered regularly interspaced short palindromic repeats and their associated protein(CRISPR-Cas)-based approaches,together with genome-scale synthesis technologies offer unprecedented opportunities for advancing genome-scale engineering in a broader *** approaches provide new tools to generate strains with desired phenotypes,understand the complexity of biological systems,and directly evolve a genome with novel ***,we review the recent major advances in genome-scale engineering tools developed for Escherichia coli,focusing on their applications in identifying essential genes,genome reduction,recoding,and beyond.

关键词： Genome-scale engineering E.coli Recombineering CRISPR-Cas

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Glucocorticoid Enhances Presenilin1-Dependent Aβ Production at Er's Mitochondrial-Associated Membrane by Downregulating Rer1 in Neuronal Cells

SSRN

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SSRN 2023年

作者： Choi, Gee Euhn Park, Ji Yong Park, Mo Ran Yoon, Jee Hyeon Han, Ho Jae Laboratory of Veterinary Biochemistry College of Veterinary Medicine Veterinary Medical Research Institute Jeju National University Jeju63243 Korea Republic of Interdisciplinary Graduate Program in Advanced Convergence Technology & Science Jeju National University Jeju63243 Korea Republic of Department of Veterinary Physiology College of Veterinary Medicine Research Institute for Veterinary Science BK21 Four Future Veterinary Medicine Leading Education & Research Center Seoul National University Seoul08826 Korea Republic of

Stress-induced release of glucocorticoid is an important amyloidogenic factor that upregulates amyloid precursor protein (APP) and β secretase 1 (BACE1) levels. Glucocorticoid also contributes to the pathogenesis of Alzheimer’s disease (AD) by increasing ER-mitochondria connectivity, in which amyloid β (Aβ) processing occurs rigorously because of its lipid raft-rich characteristics. However, the mechanism by which glucocorticoid enhances γ-secretase activity in the mitochondrial-associated membrane of ER (MAM) and subsequent accumulation of mitochondrial Aβ is unclear. In this study, we determined how glucocorticoid enhances Aβ production in MAM using SH-SY5Y cells and ICR mice. First, we observed that cortisol-induced Aβ accumulation in mitochondria preceded its extracellular apposition by enhancing γ-secretase activity, which was the result of increased presenilin 1 (PSEN1) localization in MAM. Screening data revealed that cortisol selectively downregulated the ER retrieval protein Rer1, which triggered its maturation and subsequent entry into the endocytic secretory pathway of PSEN1. Accordingly, overexpression of RER1 reversed the deleterious effects of mitochondrial Aβ on mitochondrial respiratory function and neuronal cell viability. Notably, we found that cortisol guided the glucocorticoid receptor (GR) to bind directly to the RER1 promoter, thus trans-repressing its expression. Inhibiting GR function reduced Aβ accumulation at mitochondria and improved the outcome of a spatial memory task in mice exposed to corticosterone. Taken together, glucocorticoid enhances PSEN1-mediated Aβ generation at MAM by downregulating Rer1, which is a potential target at early stages of AD pathogenesis. © 2023, The Authors. All rights reserved.

关键词： Mitochondria

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A Hybrid System Combining Direct Contact Membrane Distillation (Dcmd) and Electrochemical Switched Ion Exchange (Esix) for Efficient Lithium Recovery from Simulated Brine

SSRN

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SSRN 2023年

作者： Gulied, Mona Zavahir, Sifani Elmakki, Tasneem Park, Hyunwoong Shon, Hokyong Han, Dong Suk Center for Advanced Materials Qatar University Doha Qatar Materials Science and Technology Program College of Arts and Science Qatar University Doha Qatar School of Energy Engineering Kyungpook National University Daegu41566 Korea Republic of ARC Research Hub for Nutrients in a Circular Economy Center for Technology in Water and Wastewater School of Civil and Environmental Engineering Faculty of Engineering and IT University of Technology SydneyNSW2007 Australia Department of Chemical Engineering College of Engineering Qatar University Doha Qatar

Recovering valuable elements such as lithium (Li) from seawater reverse osmosis (SWRO) brine is crucial for building a sustainable economy due to its high storage density, making it an ideal material for energy storage. In this study, a novel hybrid system that combines direct contact membrane distillation (DCMD) and electrochemical switched ion exchange (ESIX) was designed to achieve simultaneous SWRO brine enrichment and Li recovery. The DCMD process concentrated the SWRO brine using electrospun nanofiber membranes (ENMs) made of polyvinylidene fluoride (PVDF), with the incorporation of reduced graphene oxide (rGO) nanoparticles enhancing the morphological, thermal, and mechanical stability of the PVDF ENMs. The water contact angle (WCA) of the 1-rGO/PVDF ENM was 142.08°, indicating an improved hydrophobic property that resulted in the recovery of 12% freshwater from simulated SWRO brine and a 2.4-fold increase in Li+ concentration. The 1-rGO/PVDF ENM exhibited stable performance, with an 11% reduction in WCA after 15 hours of brine concentration. In the hybrid operation, a Li-selective LiAlO2 electrode, coupled with an activated carbon counter electrode, demonstrated remarkable Li recovery for Li capture solutions enriched by the rGO-PVDF membrane in the DCMD step. Compared to the Li concentration in the DCMD feed, sequential Li capture and release cycles recovered 91.8% of Li, highlighting the critical role of the hybrid mode operation in concentrating Li from simulated brine solutions. © 2023, The Authors. All rights reserved.

关键词： Hybrid systems

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