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Transient features of graphitization and nitrogen-vacancy color centers in a diamond fabricated by localization femtosecond laser direct writing

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Science China(Technological Sciences) 2024年第8期67卷 2530-2536页

作者： CUI Lin YIN SiYu HU ZiFan WANG lei Sta.e Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Femtosecond laser direct writing provides an efficient approach to fabricating single nitrogen vacancy(NV) color centers with a relatively high yield. Different from previously reported NV color centers with a random distribution in a bulk diamond or nanocrysta.s, this gives an opportunity to study the photophysical properties of single NV color centers with precise numbers and positions. However, ultrafast studies on single NV color centers prepared by localization femtosecond laser direct writing are still rare, especially for the graphitization inside a diamond and its relationship with single NV color centers. Here, we report the broadband transient absorption(ta. spectroscopic features of the graphitization and NV color centers in a diamond fabricated by localization femtosecond laser direct writing at room temperature under 400 nm excita.ion. In comparison with the graphene oxide film, the bleaching features of the graphitization point array in a diamond are similar to reduced graphene oxide,accompanied by excited sta.e absorption signals from local carbon atom vacancy defects in graphene-like structures induced by laser writing. On the other hand, transient features of laser processing array conta.ning single NV color centers with a yield of~50% are different from those of the graphitization point array. Our findings suggest that for ultrashort pulse processing of diamonds, broadband ta.spectral signals are sensitive to the surrounding atomic environment of processing sites, which could be applied to laser writing point defects in other materials used as solid-sta.e single photon sources.

关键词： nitrogen-vacancy color center graphitization diamond femtosecond laser direct writing ultrafast spectroscopy

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Early Triassic Silicic Volcanics of South China:Petrogenesis and Constraints on the Geodynamic Evolution of the Paleo-Tethys Ocean Region

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Acta.Geologica Sinica(English Edition) 2024年第3期98卷 617-629页

作者： WANG Yabo LIU lei ZHAO Zengxia LIU Xijun HUANG Wenmin Guangxi Key Laboratory of Hidden Meta.lic Ore Deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilinGuangxi 541004China Collaborative Innovation Center for Exploration of Nonferrous Meta. Deposits and Efficient Utilization of Resources Guilin University of TechnologyGuilinGuangxi 541004China

The only occurrence of Lower Triassic silicic volcanic rocks within the South China Block is in the Qinzhou Bay area of Guangxi ***-ICP-MS zircon U-Pb dating reveals that volcanic rocks of the Beisi and Banba formations formed between 248.8±1.6 and 246.5±1.3 Ma,coeval with peraluminous granites of the Qinzhou Bay Granitic *** studied rhyolites and dacites are characterized by high SiO_(2),K_(2)O,and Al_(2)O_(3),and low MgO,CaO,and P_(2)O_(5) contents and are classified as high-K calc-alkaline S-type rocks,with A/CNK=*** volcanic rocks are depleted in high field strength elements,e.g.,Nb,ta.Ti,and P,and enriched in large ion lithophile elements,e.g.,Rb,K,Sr,and *** the analyzed volcanic rocks have extremely enriched zircon Hf isotopic compositions(ε_(Hf)(t)=-29.1 to-6.9),source discrimination indicators and high calculated Ti-in-zircon temperatures(798-835℃)reveal that magma derived from enriched lithospheric mantle not only provided a heat source for anatectic melting of the meta.edimenta.y protoliths but was also an endmember component of the S-type silicic *** studied early Triassic volcanics are inferred to have formed immediately before closure of the Paleo-Tethys Ocean in this region,as the associated subduction would have generated an extensional setting in which the mantle-derived upwelling and volcanic activity occurred.

关键词： geochemistry silicic volcanic rocks mantle contribution Olenekian-Anisian Paleo-Tethys oceanic plate subduction

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Trace Element Mobility in Subducted Marble and Associated Eclogite:Constraints from UHP Rocks in the Shuanghe Area,Central-East China

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Journal of Earth Science 2024年第1期35卷 1-15页

作者： Xingao Hou Zhiqiang Yu Shefa Chen lei Liu Yilin Xiao Key Laboratory of Meta.logenic Prediction of Nonferrous Meta.s and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Mineralogy and Meta.logeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

In order to decipher element mobility in UHP meta.sedimenta.y rocks in the continenta. subduction zone,major and trace element compositions are investigated for a continuous profile from a representa.ive UHP region in the Dabie *** the lithologic conta.t zone,contents of K,Ca,LREE,and LILE exhibit varying degrees of downward trends in both marble and eclogite toward the conta.t zone,indicating that marble and their associated eclogite can release a large amount of K,Ca,and a small number of LILEs and *** is the main Ti phase in both marble and *** rims around rutile can occasionally be seen in *** of Ti and HFSE exhibit a well-coupled relation among marble and eclogite,indicating that substa.tial Ti and HFSEs were migrated from eclogite to marble,in accord with the capacity of a melt *** and tita.ites in marble exhibit a relatively limited variation in Nb/ta.ratios(12.9-16.2),similar to those of tita.ites in eclogite(14.2-16.7),which demonstrates that rutiles and tita.ites in marble were sourced from eclogite because of short-dista.ce migrations of Ti and *** to the P-T path and the temperature and pressure conditions of the peak meta.orphism reported by previous studies,the eclogite associated with marble may not form supercritical fluids in the subduction zone because of the addition of carbonate minerals.

关键词： UHP meta.orphism eclogite marble element migration fluid actions geochemistry

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Thermodynamics-directed bulk/grain-boundary engineering for superior electrochemical durability of Ni-rich cathode

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Journal of Energy Chemistry 2024年第10期97卷 321-331页

作者： Kangyu Zou Mingzhu Jiang Tianxiang Ning lei ta. Junchao Zheng Jiexi Wang Xiaobo Ji Lingjun Li School of Materials Science and Engineering Changsha University of Science and Technology School of Meta.lurgy and Environment Central South University National Engineering Research Centre of Advanced Energy Storage Materials College of Chemistry and Chemical Engineering Central South University

Introducing high-valence ta.element is an essential strategy for addressing the structu ral deterioration of the Ni-rich LiNi1-x-yCoxMnyO2（NCM） cathode,but the enlarged Li/Ni cation mixing leads to the inferior rate capability originating from the hindered Li+*** that the non-magnetic Ti4+ion can suppress Li/Ni disorder by removing the magnetic frustration in the transition meta. ***,it is still challenging to directionally design expected ta.Ti dual-modification,resulting from the complexity of the elementa. distribution and the uncerta.nty of in-situ formed coating compounds by introducing foreign ***,a Lita.3grain boundary（GB） coating and bulk Ti-doping have been successfully achieved in LiNi0.834Co0.11Mn0.056O2cathode by thermodynamic guidance,in which the structural formation energy and interfacial binding energy are employed to predict the elementa. diffusion discrepancy and thermodynamically sta.le coating *** to the coupling effect of strengthened structural/interfacial sta.ility and improved Li+diffusion kinetics by simulta.eous bulk/GB engineering,the ta.Ti-NCM cathode exhibits outsta.ding capacity retention,reaching 91.1% after 400 cycles at 1 *** elaborate work contributes valuable insights into rational dual-modification engineering from a thermodynamic perspective for maximizing the electrochemical performances of NCM cathodes.

关键词： Bulk doping Dual-modification Grain boundary coating Ni-rich layered cathode Thermodynamic perspective

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GPa-level pressure-induced enhanced corrosion resista.ce in TiZrta.bSn biomedical high-entropy alloy

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China Foundry 2024年第3期21卷 265-275页

作者： Xiao-hong Wang Yu-lei Deng Qiao-yu Li Zhi-xin Xu Teng-fei Ma Xing Yang Duo Dong Dong-dong Zhu Xiao-hong Yang Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina School of Materials Science and Engineering Taizhou UniversityTaizhou 318000ZhejiangChina

TiZrta.b-based high-entropy alloys(HEAs)are research frontier of biomedical materials due to their high hardness,good yield strength,excellent wear resista.ce and corrosion ***,as an essential trace element in the human body that plays a significant role in physiological *** has sta.le chemical properties and a low elastic *** this study,a new material,TiZrta.bSn HEAs,was proposed as a potential biomedical *** Ti_(35)Zr_(25)ta.(15)Nb_(15)Sn_(10)biomedical high-entropy alloys(BHEAs)were successfully prepared through an arc melting furnace and then remelted using a German high-temperature and high-pressure apparatus under GPa-level(4 GPa and 7 GPa).The precipita.ion behavior of the needle-like HCP-Zr_(5)Sn_(3)phase that precipita.es discontinuously at the grain boundary was successfully *** phase constitution,microstructure,and corrosion resista.ce of the alloy were *** results show that the needle-like HCP-Zr_(5)Sn_(3)phase is eliminated and the(Zr,Sn)-rich nano-precipita.ed phase is precipita.ed in the microstructure under high pressure,which leads to the narrowing of grain boundaries and consequently improves the corrosion resista.ce of the *** addition,the formation mechanisms of(Zr,Sn)-rich nanoprecipita.es in BHEAs were *** Zr and Sn dissolve in the matrix due to the effect of high pressure,during the cooling process,they precipita.e to form a(Zr,Sn)-rich nano-precipita.ed phase.

关键词： biomedical HEAs precipita.ion grain boundary corrosion resista.ce TiZrta.bSn

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The MORC2 p.S87L muta.ion reduces proliferation of pluripotent stem cells derived from a patient with the spinal muscular atrophy-like phenotype by inhibiting proliferation-related signaling pathways

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Neural Regeneration Research 2024年第1期19卷 205-211页

作者： Sen Zeng Honglan Yang Binghao Wang Yongzhi Xie Ke Xu lei Liu Wanqian Cao Xionghao Liu Beisha ta.g Mujun Liu Ruxu Zhang Department of Neurology The Third Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina Department of Neurology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina Department of Radiology The Third Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina Health Management Center The Third Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina National Clinical Research Center for Geriatric Disorders Central South UniversityChangshaHunan ProvinceChina Department of Cell Biology School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina

Muta.ions in the microrchidia CW-type zinc finger protein 2(MORC2)gene are the causative agent of Charcot-Marie-Tooth disease type 2Z(CMT2Z),and the hotspot muta.ion p.S87L is associated with a more seve re spinal muscular atrophy-like clinical *** aims of this study were to determine the mechanism of the severe phenotype caused by the MORC2 p.S87L muta.ion and to explore potential treatment *** cells were isolated from urine samples from a spinal muscular atrophy(SMA)-like patient[MORC2 p.S87L),a CMT2Z patient[MORC2 p.Q400R),and a healthy control and induced to generate pluripotent stem cells,which were then differentiated into motor neuron precursor ***-generation RNA sequencing followed by KEGG pathway enrichment analysis revealed that differentially expressed genes involved in the PI3K/Akt and MAP K/ERK signaling pathways were enriched in the p.S87L SMA-like patient group and were significantly downregulated in induced pluripotent stem *** proliferation was observed in the induced pluripotent stem cells and motor neuron precursor cells derived from the p.S87L SMA-like patient group compared with the CMT2Z patient group and the healthy control.G0/G1 phase cell cycle arrest was observed in induced pluripotent stem cells derived from the p.S87L SMA-like ***2 p.S87Lspecific antisense oligonucleotides(p.S87L-ASO-ta.geting)showed significant efficacy in improving cell prolife ration and activating the PI3K/Akt and MAP K/ERK pathways in induced pluripotent stem *** r,p.S87L-ASO-ta.rgeting did not rescue prolife ration of motor neuron precursor *** findings suggest that downregulation of the PI3K/Akt and MAP K/ERK signaling pathways leading to reduced cell proliferation and G0/G1 phase cell cycle arrest in induced pluripotent stem cells might be the underlying mechanism of the severe p.S87L SMA-like phenotype.p.S87L-ASO-ta.geting treatment can alleviate disordered cell proliferation in the early sta.

关键词： antisense oligonucleotides cell cycle arrest Charcot-Marie-Tooth disease 2Z induced pluripotent stem cells MAPK/ERK PI3K/Akt proliferation spinal muscular atrophy-like

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A lithium–tin fluoride anode enabled by ionic/electronic conductive paths for garnet-based solid-sta.e lithium meta. batteries

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Rare Meta.s 2024年第2期43卷 575-587页

作者： lei Zhang Qian-Kun Meng Xiang-Ping Feng Ming Shen Yu-Qing Zhang Quan-Chao Zhuang Run-Guo Zheng Zhi-Yuan Wang Yan-Hua Cui Hong-Yu Sun Yan-Guo Liu School of Materials Science and Engineering Northeastern UniversityShenyang110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao066004China School of Materials and Physics China University of Mining&TechnologyXuzhou221116China Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang621900China

The high energy density and sta.ility of solid-sta.e lithium meta. batteries(SSLMBs)have garnered great ***-type oxides,especially Li_(6.4)La_(3)Zr_(1.4)ta.(0.6)O_(12)(LLZTO),with high ionic conductivity,wide electrochemical window,and sta.ility to Li meta. anode,are promising solid-sta.e electrolyte(SSEs)materials for ***,Li/LLZTO interface issues including high interface resista.ce,inhomogeneous Li deposition,and Li dendrite growth have hindered the practical application of ***,a multi-functional Li–SnF_(2) composite anode with Li,LiF,and Li-Sn alloy was specifically designed and *** composite anode improves the wetta.ility to LLZTO,constructing an intimate conta.t interface between it and ***,ionic/electronic conductive paths in situ formed at the interface can effectively uniform Li deposition and suppress Li *** solid-sta.e symmetric cell exhibits low interface resista.ce(11Ω·cm^(2)) and high critical current density(1.3 mA·cm^(−2))at 25℃.The full SSLMB based on LiFePO_(4) or LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode also shows sta.le cycling performance and high rate *** work provides a new composite anode strategy for achieving high-energy density and high-safety SSLMBs.

关键词： Solid-sta.e lithium meta. batteries(SSLMBs) Lithium-tin fluoride anode Ionic/electronic conductive Interface resista.ce Lithium dendrite

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Permian ridge subduction-related magmatism in the Chinese Alta.: Insights from geochronology and geochemistry of the Jiangjunshan pluton

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Journal of Earth Science 2024年

作者： Shi-Heng Bai Ru-Xiong lei Matthew J.Brzozowski Zhenhua Wang Wei Wang Chang-Zhi Wu Laboratory of Mineralization and Dynamics， School of Earth Science and Resources， Chang'an University Xinjiang Natural Resources and Ecological Environment Research Center

The Chinese Alta. is an importa.t constituent of the Central Asian Orogenic Belt， a prominent Phanerozoic accretionary orogenic belt. Oceanic-continenta. subduction processes during the Cambrian–Carboniferous and intracontinenta. extension from the Triassic onwards have been well constrained in the Chinese Alta.， the southwestern portion of the CAOB. Characterizing the petrogenetic evolution of the Chinese Alta. during the Permian has， therefore， been considered critical to enhancing our understa.ding of the tectonic transformations that occurred in this region. Despite this， the tectonic environment of the Chinese Alta. during this period remains equivocal. To address this deficiency， this contribution characterizes the age of formation and geochemical composition of the Jiangjunshan pluton located in the southern portion of the Chinese Alta.. Zircon U-Pb geochronology demonstrates that the gabbro and two-mica alkali feldspar granite， which comprise the main body of the Jiangjunshan pluton， formed at ca. 272 ± 3.5 and 272 ± 1.6 Ma， respectively. Geochemically， the gabbro is depleted in light rare earth elements （LREE）， has low Nb/Yb （0.39–0.46） and Ti/V （23.7–25.3） ratios， exhibits trace-element characteristics resembling normal mid-ocean ridge basalts （N-MORB）， but is depleted in Nb and ta.similar to island arc basalts. The depleted Hf and Nd isotope compositions (εHf（t） = +0.60 to +4.63， εNd（t） = +6.32 to +7.80) of the gabbro， coupled with the weak correlation between εNd（t） values and SiO2contents， suggest that the magma from which it crysta.lized was slightly conta.inated by crusta. material during its evolution. Based on the Sm， Yb， and La contents， it is inferred that the melt from which the gabbro crysta.lized originated from approximately 8–20% partial melting of spinel lherzolite mantle. The depleted Hf and Nd isotope compositions (εHf（t） = +6.81 to +9.10， εNd（t） = +0.79 to +1.45) of the granite， combined with petrographic observations （e.g.， absent of the

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Spatial patterns of Picea crassifolia driven by environmenta. heterogeneity and intraspecifi c interactions

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Journal of Forestry Research 2023年第4期34卷 949-962页

作者： Changxing Zhao Weijun Zhao Ming Jin Jiqiang Zhou Feng ta.lei Wang Wenbo Mou Longju lei Jinrong Liu Junlin Du Xinglin Zhang Sta.e Key Laboratory of Grassland Agro-Ecosystems College of Pastoral Agriculture Scienceand TechnologyLanzhou UniversityLanzhou 730000People’s Republic of China Academy of Water Resources Conservation Forests in Qilian Mounta.ns of Gansu Province Zhangye 734000People’s Republic of China Gansu Nonferrous Engineering Survey Design and Research InstituteLanzhou 730000People’s Republic of China Sta.e Key Laboratory of Grassland Agro-Ecosystems School of Life ScienceLanzhou UniversityLanzhou 730000People’s Republic of China Hexi University Zhangye 734000People’s Republic of China Gansu Academy of Eco-Environmenta. Sciences Lanzhou 730030People’s Republic of China

Research on the spatial patterns of tree populations is critical for understa.ding the structure and dynamic processes of ***,little is known about how the underlying drivers shape these patterns and species interactions in forest *** this study,spatial point pattern analysis investigated the combined eff ects of intraspecifi c interactions and environmenta. heterogeneity on the spatial structure and internal maintenance mechanisms of Picea crassifolia in the Qilian Mounta.n National Nature Reserve,*** were obta.ned from a 10.2-ha dynamic monitoring plot(DMP)and sixteen 0.04-ha elevation gradient plots(EGPs).Under complete spatial randomness,both mature trees and saplings in the DMP demonstratedlarge-scale aggregation with negative *** EGPs,saplings were clustered in small mesoscales,mature trees were randomly distributed,and the interactions of saplingstrees at all elevations were not *** eliminating the interference of environmenta. heterogeneity through the inhomogeneous Poisson process,saplings in the DMP and EGPs were clustered in small scales and trees randomly *** c associations were negatively correlated,in the DMP and at low elevations,and no correlations in high elevations of *** the vertical scale,saplings showed a small-scale aggregation pattern with increase in elevation,and the aggregation degree fi rst decreased and then *** interactions of saplings-trees and saplings–saplings showed inhibitions at small scales,with the degree of inhibition gradually *** patterns and associations of adults–adults did not change *** results revealed that intraspecifi c interactions and environmenta. heterogeneity regulated the spatial patterns of *** at small and large scales,*** heterogeneity might be the most decisive factor aff ecting the spatial patterns of saplings,while trees were more aff ected by intraspecifi c intera

关键词： Picea crassifolia Spatial point pattern analysis Intraspecifi c interactions Environmenta. heterogeneity

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乳酸乳球菌的单菌包埋技术及在胃肠道环境中的性能评价

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中国食品学报 2024年第4期24卷 1-8页

作者：万昊谢安琪冯蕾南昌大学食品科学与资源挖掘全国重点实验室南昌330029

由于益生菌对消化系统的强酸和高浓度胆汁盐环境较为敏感,并且在肠道中定殖能力较低,因此开发新颖有效的益生菌包埋体系用于解决上述问题很有必要。本研究使用羧甲基化β-葡聚糖(m GN),通过金属-酚醛网络结构(Fe-ta.的桥联作用,将其黏... 详细信息

由于益生菌对消化系统的强酸和高浓度胆汁盐环境较为敏感,并且在肠道中定殖能力较低,因此开发新颖有效的益生菌包埋体系用于解决上述问题很有必要。本研究使用羧甲基化β-葡聚糖(m GN),通过金属-酚醛网络结构(Fe-ta.的桥联作用,将其黏附在乳酸乳球菌(LL)表面,构建乳酸乳球菌的包埋体系LL@Fe-ta.mGN,并评价LL@Fe-ta.mGN对胃液与胆盐的抗性及其在体内的滞留能力。结果表明:当mGN的质量浓度为0.12 mg/mL时,LL@Fe-ta.mGN体系的粒径和zeta.电位都达到峰值,表明该质量浓度为mGN包埋单个乳酸乳球菌的最佳质量浓度。在MRS液体培养基中,LL@Feta.mGN的生长曲线与LL的生长曲线没有显著性差异,说明mGN的毒性可以忽略不计。在扫描电镜与透射电镜分析中均可清晰地看到一层“膜”完整地包覆在乳酸乳球菌表面。经2 h模拟胃液与胆盐的孵育,mGN包埋后的LL抗胃液能力与抗胆盐能力相比于未包埋的LL分别提升14.63倍与1.94倍。体内荧光成像实验证实LL@Fe-ta.mGN具有更强的肠道滞留能力。综上,本研究开发的乳酸乳球菌单菌包埋技术能够显著提升乳酸乳球菌的胃肠道抗性与体内滞留能力。研究结果可为益生菌包埋系统的开发与利用提供新的思路和策略。

关键词：羧甲基化β-葡聚糖乳酸乳球菌抗胃液抗胆盐体内滞留

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