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Recent progress on excitation and manipulation of spin-waves in spin Hall nano-oscillators

Chinese Physics B 2020年第11期29卷 117-130页

作者： Liyuan Li Lina Chen Ronghua Liu youwei Du National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China New Energy Technology Engineering Laboratory of Jiangsu Provence&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China

Spin Hall nano oscillator(SHNO),a new type spintronic nano-device,can electrically excite and control spin waves in both nanoscale magnetic metals and insulators with low damping by the spin current due to spin Hall effect and interfacial Rashba *** spin-wave modes have been excited successfully and investigated substantially in SHNOs based on dozens of different ferromagnetic/nonmagnetic(FM/NM)bilayer systems(e.g.,FM=Py,[Co/Ni],Fe,CoFeB,Y3Fe5O12;NM=Pt,Ta,W).Here,we will review recent progress about spin-wave excitation and experimental parameters dependent dynamics in *** nanogap SHNOs with in-plane magnetization exhibit a nonlinear self-localized bullet soliton localized at the center of the gap between the electrodes and a secondary high-frequency mode which coexists with the primary bullet mode at higher *** in the nanogap SHNOs with out of plane magnetization,besides both nonlinear bullet soliton and propagating spin-wave mode are achieved and controlled by varying the external magnetic field and current,the magnetic bubble skyrmion mode also can be excited at a low in-plane magnetic *** spin-wave modes show thermal-induced mode hopping behavior at high temperature due to the coupling between the modes mediated by thermal magnon mediated ***,thanks to the perpendicular magnetic anisotropy induced effective field,the single coherent mode also can be achieved without applying an external magnetic *** strong nonlinear effect of spin waves makes SHNOs easy to achieve synchronization with external microwave signals or mutual synchronization between multiple oscillators which improve the coherence and power of oscillation modes *** waves in SHNOs with an external free magnetic layer have a wide range of applications from as a nanoscale signal source of low power consumption magnonic devices to spin-based neuromorphic computing systems in the field of artificial intelligence.

关键词： spin–orbit torque spin Hall nano-oscillator spin-waves synchronization

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Hydrocarbon Generation and Expulsion of the Upper Triassic T3x5Source Rocks in the Western Sichuan Depression: Assessment for Unconventional Natural Gas

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 175-186页

作者： GUO Yingchun SONG Yan PANG Xiongqi WANG youwei YANG Keming LI Boyuan State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Institute of Unconventional Natural Gas China University of Petroleum Research Institute of Petroleum Exploration and Development PetroChina Southwest Branch Company China Petroleum and Chemical Corporation

Tight-sand gas in the Jurassic and shale gas within the fifth member of Xujiahe Formation （T3xs） in the Western Sichuan Basin （WSD） are currently regarded as the most prolific emerging unconventional gas plays in China. This study conducted a conventional evaluation of T3x5 source rocks in the WSD, and investigated their hydrocarbon generation and expulsion characteristics, including intensity, efficiency and amount. The results show that, the T3x5 source rocks are thick （generally 〉200 m）, and have a high total organic content （TOC）, ranging from 2.5 to 4.5 wt%. It is thus indivative of a great hydrocarbon generation potential when they underwent high thermal evolution （Ro〉1.2%） in the area. In addition, an improved method of hydrocarbon generation potential is applied, indicating that the source rocks reached a hydrocarbon expulsion threshold with vitrinite reflectance （Ro） reaching 1.06%. and that the comprehensive hydrocarbon expulsion efficiency is about 60%. The amount of hydrocarbon generation and expulsion from Tax5 source rocks is 3.14x10^10 t and 1.86x10^10 t, respectively, with a residual amount of 1.28x10^10t within them. Continuous-type tight-sand gas is predicted to have developed in the Jurassic in the Chengdu Sag of the WSD because of the good source-reservoir configuration; the Jurassic sandstone reservoirs are tight, and the gas expelled from the T3xs source rocks migrates for very short distances vertically and horizontally. The amount of gas accumulation in the Jurassic reservoirs derived from T3x5 source rocks is up to 9.3x10s t. Geological resources of shale gas are up to 1.05x10TM t. Small differences between the amounts calculated by the volumetric method and those obtained by hydrocarbon generation potential method may be due to other gas accumulations present within interbedded sands associated with gas shales.

关键词： source rocks evaluation hydrocarbon generation and expulsion tight-sand gas shale gas,resource assessment Upper Triassic Western Sichuan Depression

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Electrospun polyporous VN nanofibers for symmetric all-solid-state supercapacitors

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Journal of Advanced Ceramics 2018年第3期7卷 246-255页

作者： Dandan ZHANG Jing LI Zhen SU Sanyuan HU Heping LI youwei YAN State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

To promote the energy density of symmetric all-solid-state supercapacitors(SCs),efforts have been dedicated to searching for high-performance electrode materials recently. In this paper,vanadium nitride(VN) nanofibers with mesoporous structure have been fabricated by a facile electrospinning method. Their crystal structures and morphology features were characterized by X-ray diffraction,scanning electron microscopy,and transmission electron microscopy. The mesoporous structure of VN nanofibers,which can provide short electrolyte diffusion routes and conducting electron transport pathways,is beneficial to their performance as a supercapacitor electrode. Under a stable electrochemical window of 1.0 V,VN nanofibers possess an excellent mass specific capacitance of 110.8 F/g at a scan rate of 5 mV/s. Moreover,the VN nanofibers were further assembled into symmetric all-solid-state SCs,achieving a high energy density of 0.89 mW·h/cm^3 and a high power density of 0.016 W/cm^3 over an operating potential range from 0 to 1.0 V. These results demonstrate that VN nanofibers could be potentially used for energy storage devices.

关键词： vanadium nitride(VN) mesoporous structure nanofiber supercapacitors(SCs) electrospinning

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Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第1期68卷 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

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基于WOA优化FNN-PID的单晶硅加热炉炉温控制

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半导体技术 2025年第1期50卷 86-94页

作者：周佳凯张洪江南大学机械工程学院江苏无锡214000 江苏省食品先进制造装备技术重点实验室江苏无锡易214000

针对单晶硅加热炉炉温控制的大惯性、强耦合、长调节时间等问题,提出了基于鲸鱼优化算法(WOA)的优化模糊神经网络(FNN)比例-积分-微分(PID)算法。通过测试实验装置的温度推算出模型表达式,采用WOA进行选代寻优,得到合适的PID参数,利用FN... 详细信息

针对单晶硅加热炉炉温控制的大惯性、强耦合、长调节时间等问题,提出了基于鲸鱼优化算法(WOA)的优化模糊神经网络(FNN)比例-积分-微分(PID)算法。通过测试实验装置的温度推算出模型表达式,采用WOA进行选代寻优,得到合适的PID参数,利用FNN对PID参数进行实时调整,以实现动态解耦。通过仿真软件进行仿真验证,并在搭建的模型上分别进行阶跃响应实验和信号跟随实验。仿真结果表明,相较于传统的PID算法和FNN-PID算法,基于WOA的优化FNN-PID算法有效提升了系统的升温速度且无超调。对加热炉进行升温实验,结果表明温度超调量最高为0.9℃,恒温区温控精度保持在±0.3℃,表明该方法可有效提升系统升温速度和稳定性。

关键词：多温区温度控制鲸鱼优化算法(WOA) 模糊神经网络(FNN) 比例-积分-微分(PID) 单晶硅加热炉

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Single source precursor derived SiBCNHf ceramic with enhanced high-temperature microwave absorption and antioxidation

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Journal of Materials Science & Technology 2022年第31期126卷 215-227页

作者： Yan Song Ziyu Liu Xicheng Zhang Runqiu Zhu youwei Zhang Pinggui Liu Lihua He Jie Kong MOE Key Laboratory of Space Applied Physics and Chemistry School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China AECC Beijing Institute of Aeronautical Materials Beijing 100095China

Electromagnetic(EM)wave-absorbing materials with high-temperature-resistance are urgently desirable to eliminate EM interference in extreme *** derived ceramics(PDC)route is being evolved as an effective strategy to solve the ***,a single source hyperbranched polyborosi-lazane precursor containing hafnium(hb-PBSZ-Hf)is introduced and the SiBCNHf ceramic is obtained by further *** micro-sized tissues including HfC,SiC,HfB 2 nanocrystals and segregated carbons are in situ generated during annealing which not only increase EM wave absorption ability(minimum re-flection coefficient(RC_(min))is-56.71 dB with a thickness of 2.5 mm,effective absorption bandwidth(EAB)is 3.4 GHz),but also improve antioxidation property(less than 2 wt.%mass fluctuation at 1400℃in air).Theoretical simulation of complex permittivity suggests that SiBCNHf ceramic has an RC_(min)of less than-5 dB for the whole X-band even at 1100℃.Such SiBCNHf ceramic with superior high-temperature-resistance and antioxidation performance derived from single source precursors possesses great potential for EM wave absorbing coatings in high-temperature and harsh environments.

关键词： hb-PBSZ-Hf precursor SiBCNHf ceramic EM wave absorption Antioxidation performance

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Application of a catch-based method for stock assessment of three important fisheries in the East China Sea

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Acta Oceanologica Sinica 2018年第2期37卷 102-109页

作者： ZHANG Kui ZHANG Jun XU youwei SUN Mingshuai CHEN Zuozhi YUAN Meng South China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Key Laboratory of Open-Sea Fishery Development Ministry of Agriculture

Most fisheries in China do not have maximum sustainable yield（MSY） estimates due to limited and poor ***, finding a common method to estimate MSY or total allowable catch（TAC） for fishery management is necessary. MSYs of three important fisheries in the East China Sea were evaluated through a catch-based *** for intrinsic rate of increase（r） and five levels of process error were considered. Results showed hairtail Trichiurus japonicas（Temminck and Schlegel） and small yellow croaker Larimichthys polyactis（Bleeker） fisheries experienced overfishing from the mid-1990 s to the early 2000 s, and the suggested TACs were 55.8×10^4 t and9.06×10^4 t, respectively. Decades of overfishing in wintering and spawning grounds of large yellow croaker Larimichthys crocea（Richardson） caused the fishery＇s collapse in the 1980 s, and it has not recovered until *** Catch–MSY model generated similar estimated MSYs with other methods and may be a useful choice for the assessment of regional stocks in China.

关键词： Catch-MSY model fisheries in the East China Sea intrinsic rate of increase maximum sustainable yield overfishing

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Zircon U-Pb Ages and Sr-Nd-Hf Isotopic Characteristics of the Huichizi Granitic Complex in the North Qinling Orogenic Belt and Their Geological Significance

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Journal of Earth Science 2018年第3期29卷 492-507页

作者： youwei Chen Ruizhong Hu Xianwu Bi Shaohua Dong Yue Xu Ting Zhou State Key Laboratory of Ore Deposit Geochemistry Chinese Academy of Sciences

The Huichizi granite complex is the largest Paleozoic 1-type intrusion located in the North Qinling orogenic belt （NQB）. In this study, we present systematic geochemical element data, zircon U-Pb ages, Ln-Hf isotopic data, and Sr-Nd isotopic data for the Huichizi granites. In terms of mineral and chemical compositions, these granites are biotite monzonitic and alkali-feldspar granites, both of which are characterized by high SiO2 and total alkali contents and low MgO, TiO2, and TFeO contents. These granites are weakly peraluminous （A/CNK values are 1-1.06 for biotite mon- zonitic granites and 1.04-1.09 for alkali-feldspar granites） and possess the geochemical characteristics of adakitic rocks, e.g., high Sr contents （319 ppm-633 ppm）, Sr/Y ratios （18.5-174）, and （La/Yb）N ratios （17.6-57） and low MgO （0.04 wt.%-0.83 wt.%）, Y （3.0 ppm-17.2 ppm）, and heavy rare-earth element （HREE） contents. This indicates that these rocks were most likely derived from the partial melting of a thickened lower crust. In situ zircon U-Pb dating of these granites yields Early Caledonian ages （437 Ma for biotite monzonitic granites and 424 Ma for alkali-feldspar granites）, indicating that the Huichizi granitic complex is the product of multi-periodic magmatism. The positive but varying zircon tHe（t） values （＋0.6 to ＋8.5） suggest that this thickened lower crust was mainly juvenile, i.e., accreted from depleted mantle during the Neo-Mesoproterozoic Period, but involved the ancient recycled crust. Biotite monzonitic granites formed during crust thickening at the extrusion stage, whereas the alkali granites formed during crust thickening at the extension stage （post extrusion）. The Huichizi granite complex witnessed the process of extrusion to extension because of the collision between the NCB and the Qinling microcontinent in the Caledonian.

关键词： U-Pb age Sr-Nd-Hf isotope Huichizi granitic complex adakitic granite North Qinling orogen.

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An experimental study of tin partition between melt and aqueous fluid in F/Cl-coexisting magma

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Chinese Science Bulletin 2009年第6期54卷 1087-1097页

作者： HU XiaoYan BI XianWu SHANG LinBo HU RuiZhong CAI GuoSheng CHEN youwei State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Guizhou Bureau of Nonferrous Metal Geological Exploration Guiyang 550002 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

为了调查听矿石的形成机制，与忍受 F 花岗石联系了，在忍受 F 之间的听分区的试验性的研究花岗石融化，共存的忍受 HCl 水的液体与接近 NNO 的 fo 2 在 850 ° C 和 100MPa 被进行。锡的 Geochemical 行为被变化在以不同氧化铝浸透索引... 详细信息

为了调查听矿石的形成机制，与忍受 F 花岗石联系了，在忍受 F 之间的听分区的试验性的研究花岗石融化，共存的忍受 HCl 水的液体与接近 NNO 的 fo 2 在 850 ° C 和 100MPa 被进行。锡的 Geochemical 行为被变化在以不同氧化铝浸透索引 ASI 开始稳固的材料跟踪，在 F 内容并且在开始各种各样的 HCl 集中的液体。结果显示出那 D 有 ASI 的 Sn 增加融化并且每铝土融化为进在 F/Cl-coexisting 系统的水的液体的听分区是有利的。更高的 HCl 集中的水的液体为锡的丰富是有益的。而且，在玻璃跑产品的氯内容在岩浆与 F 和 Cl 内容断然相关。在 F/Cl-coexisting 系统，花岗石在能为听矿石的形成用作一座水库的 melt 与内容(>∼1 wt%) 能提取并且充实的高 F 融化锡。然而，当在 melt 的 F 内容在 1 wt% 下面时，锡的分配系数将显著地增加。因此， F 内容的减少对进有高 HCl 内容的水的液体的锡的分区有利，因此支持热水的听矿石的免职。

关键词：共存系统孔子分区实验岩浆水人机交互融化

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The secondary periodic element ■ and its applications

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Science China Mathematics 2025年第1期 207-222页

作者： Jianguo hong Xiangjun Wang Yu Zhang Science College Shijiazhuang University School of Mathematical Sciences Nankai University Center for Applied Mathematics Tianjin University

Let p≥7 be a *** prove that ■ survives to E∞in the Adams-Novikov spectral ***,using the Thom map Φ:■,we can see that h0h3also survives to E∞in the classical Adams spectral *** an application of these results,we ...

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