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氧气和硫化钠对赤铜矿浮选的影响及作用机理

Transactions of Nonferrous Metals Society of China 2023年第4期33卷 1233-1243页

作者：贾晓东宋凯伟蔡锦鹏苏超徐晓会马印禹申培伦刘殿文昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室昆明650093 昆明理工大学云南省战略金属矿产资源绿色分离与富集重点实验室昆明650093 华北理工大学研究生院唐山063210 山东黄金集团有限公司济南250100

通过浮选试验、场发射扫描电子显微镜(FESEM)、电子探针(EPMA)以及X射线光电子能谱(XPS)等研究氧气和硫化钠对赤铜矿浮选的影响。浮选试验表明,用适量的硫化钠预处理赤铜矿表面后可大幅提升赤铜矿的可浮性。FESEM显示硫化后的赤铜矿表... 详细信息

通过浮选试验、场发射扫描电子显微镜(FESEM)、电子探针(EPMA)以及X射线光电子能谱(XPS)等研究氧气和硫化钠对赤铜矿浮选的影响。浮选试验表明,用适量的硫化钠预处理赤铜矿表面后可大幅提升赤铜矿的可浮性。FESEM显示硫化后的赤铜矿表面覆盖有大量碎片,在Na_(2)S浓度为5.0×10^(−4)mol/L时,这些碎片的形状更加规则和完整。结合EPMA和EDS分析发现,这些碎片是新形成的铜硫化物,是促进赤铜矿高效浮选的关键。XPS分析表明,赤铜矿暴露于空气中表面极易被氧化成CuO,硫化钠优先与表面的CuO膜发生氧化还原反应,此过程中,Cu^(2+)被还原为Cu^(+),S^(2-)主要被氧化为(S_(2))^(2-)和(S_(n))^(2−)。

关键词：赤铜矿硫化浮选硫化机理氧化硫化铜

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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

Pronounced impact of size and shape effects on creep rupture life of a K439B superalloy combustion chamber casting simulator

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China Foundry 2025年

作者： wen-tong liu Yi-dong Wu Lei Gao Jing-yang Chen Cheng-bo Xiao Xi-dong Hui State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The size and shape effect(SSE) of components has become a critical issue for mechanical properties, application reliability, and processing. In this study, the creep rupture life(CRL) of components with different wall thicknesses and positions in a combustion chamber casing simulator made of K439B superalloy was investigated. The intrinsic mechanisms of the SSE were explored from the dendrite structure, volume fraction and size of the γ' phase, and element segregation, etc. It is shown that this casting exhibits a strong SSE of creep rupture life, characterized by a significant difference in the CRL values up to 60% with the variation of wall thickness and position in the casing. In terms of casting technology, the influence of SSE on CRL is actually determined by the cooling rate. The SSE on the creep rupture life originates from the dendrite structure(such as the secondary dendrite arm spacing), volume fraction size of the γ' phase in the dendrite trunk, and elements segregation rate. This work may have implications for the design and application of engineering components with large sizes and complex structures.

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A self-adaptive inorganic in-situ separator by particle crosslinking for nonflammable lithium-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 469-480页

作者： Jiarui Yang Jiuzhou liu wenrui Cai Ziyu Zhao Shan Wang Lu He Shanshan Lv Zhiwei Zhu Zhongfeng Ji Guojiang wen Hua Li Yuanming Zhai Xuewei Fu Wei Yang Yu Wang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University

All-safe liquid-state lithium-ion batteries(ASLS-LIBs) is of great interest as they can potentially combine the safety of all-solid-state batteries with the high performance and low manufacturing cost of traditional liquid-state LIBs. However, the practical success of ASLS-LIBs is bottlenecked by the lack of advanced separator technology that can simultaneously realize high performances in puncturing-tolerability,fire-resistance, and importantly, wetting-capability with non-flammable liquid-electrolytes. Here, we propose a concept of inorganic in-situ separator(IISS) by hybrid-sol physical crosslinking directly onto the electrode surface to address the above challenges. Particularly, the hybrid-sol is designed with silica nanoparticles as the building block and poly(vinylidene difluoride) nanoparticles as the crosslinking agent. The critical factors for controlling the IISS microstructures and properties have been systematically investigated. The advantages of the IISS have been confirmed by its fast wetting with various fireresistant liquid-electrolytes, customizable thickness and porous structures, robust interface with planar or three-dimensional(3D)-structured electrodes, and importantly, unexpected self-adaptability against puncturing. Enabled by the above merits, a fire-resistant ASLS-LIB is successfully assembled and demonstrated with stable electrochemical performance. This sol-crosslinked IISS may open an avenue for the studies on the next-generation separator technology, cell assembling, solid electrolyte processing as well as non-flammable secondary batteries.

关键词： Silica nanoparticles

Intelligent interaction system based on multimodal conformal triboelectric nanogenerator patch for disabled sports and life

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Science China Technological Sciences 2025年

作者： Yuzhang wen Mengqi ZHANG Zhenning XIE Zida AN Bing liu Fengxin SUN Tianming ZHAO Zuojun YU Fei WANG Yupeng MAO Physical Education Department Northeastern University(Shenyang) Faculty of Robot Science and Engineering Northeastern University Criminal Investigation Police University of China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences China Ice Sports College Beijing Sport University

Intelligent interaction technology based on advanced sensing units has become a research hotspot. In this paper, an intelligent interaction system (IIS) based on a multimodal conformal triboelectric nanogenerator patch (MCTP) is reported for sports monitoring and life promotion of the disabled. This IIS consists of a cloud-based smart sports recognition program and a smart life application. The porous micro-reinforced structure of polyurethane (PU) Sponge&Ecoflex, and the surface modification of PTFE by coating it with MXene endows the MCTP with excellent electrical properties. It shows good angle and force sensitivities of 1.1 V/°and 1.61 V/N, respectively, and has an ultra-fast response time of 15 ms, meeting the needs of human motion monitoring. The MCTP can also capture the mechanical energy, producing a maximum output power of 139μ*** with the commercial inertial measuring unit (IMU), the MCTP shows better consistency in human joint angle sensing. A precise analysis of wheelchair curling sports monitoring points is achieved by combining the MCTP and the human anatomy model. The cloud-based smart sports recognition program utilizes machine learning to achieve visual feedback on the three throwing technologies of draw, takeout and clearing. In addition, the developed smart life application uses a highsensitivity MCTP-sensor array design to achieve a variety of smart home interactions through simple finger touches. Overall,the IIS integrates the three major functions of smart sports sensing, energy capture, and smart home control, providing important application prospects in the fields of smart sports and human-computer interaction for the disabled.

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Polarization-encoded neural networks with simplified grating patch

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Science China Technological Sciences 2025年

作者： Chengyan ZHONG Xiang WANG Lingfei LI Yuanchi CUI Lei XIAO Dawei SONG Junxiong GUO wen HUANG Yufeng GUO Yu liu College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation Centre Zhejiang University Nanjing Mumusili Technology Co. LTD School of Integrated Circuits Tsinghua University Institute of Advanced Study School of Electronic Information and Electrical Engineering Chengdu University State Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of China

Optical neural networks (ONNs) offer a promising solution for high-performance, energy-efficient artificial intelligence hardware by leveraging the parallelism and speed of light. However, the large-scale implementation of ONNs remains challenging due to the bulky footprint and complex control of optical synapses. In this work, we propose and simulate a plasmonic polarized synaptic architecture that overcomes the diffraction limit and enables ultra-compact ONNs. By tuning the polarization state of incident light, the optical transmittance through each plasmonic unit can be dynamically adjusted to represent a synaptic weight. Our plasmonic structures, with features as small as 40 nm, operate well below this limit in the visible spectrum (400–750 nm). Compared with diffraction and interference-based circuit designs, our proposed method achieves a substantial reduction in synaptic density by factors of 150000-fold and 1500-fold, respectively. Furthermore, we successfully demonstrate a proof-of-concept plasmonic ONN applied to the Canadian Institute for Advanced Research—10classes (CIFAR-10) dataset using a Visual Geometry Group network with 16 layers (VGG16) model. After training for 80epochs, the network achieves an accuracy of 93%. The polarization-tunable plasmonics paves the way towards scalable ONNs for next-generation artificial intelligence (AI) accelerators and smart sensors.

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清代大一统国家视野下的州县驿站财政

史学集刊 2025年第1期 63-74页

作者：刘文鹏中国人民大学清史研究所北京100872

清朝建立后意图以政府雇募的方式,取代明代以来驿站差役派诸民间的“民当”做法,为此对驿站财政进行了一番改革,但实际上,由于经费短缺,强制性摊派屡禁不绝。及至清代晚期,因大规模战争的压力,州县向百姓摊派更多的额外驿站差徭,使得州... 详细信息

清朝建立后意图以政府雇募的方式,取代明代以来驿站差役派诸民间的“民当”做法,为此对驿站财政进行了一番改革,但实际上,由于经费短缺,强制性摊派屡禁不绝。及至清代晚期,因大规模战争的压力,州县向百姓摊派更多的额外驿站差徭,使得州县驿站财政发生结构性变化。以河南为例,在官绅合作下,州县组建以车马局为代表的非正式机构,系统管理境内驿站差徭的摊派和使用,由此建立起国家制度之外的额外财政体系。驿站额外财政的产生和发展,是清中后期州县驿站财政转型的结果,它大幅提升了大一统国家汲取基层资源的能力,为近代州县地方财政的形成奠定了基础。

关键词：清代州县驿站财政车马局

肛泰软膏配合PPH加外痔剥离切除术治疗重度混合痔

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中国肛肠病杂志 2018年第1期38卷 21-22页

作者：周鹏飞田仓瑜琦刘佃温刘翔河南中医药大学河南郑州450000 浙江中医药大学浙江杭州310000 河南中医药大学第三附属医院河南郑州450000

为观察肛泰软膏配合PPH加外痔剥离切除术治疗重度混合痔的临床疗效,将重度混合痔患者40例随机分为治疗组和对照组,每组20例。2组均采用PPH切除内痔并剥离切除外痔,治疗组术后使用肛泰软膏常规换药,对照组给于复方多粘菌素B软膏换药,对... 详细信息

为观察肛泰软膏配合PPH加外痔剥离切除术治疗重度混合痔的临床疗效,将重度混合痔患者40例随机分为治疗组和对照组,每组20例。2组均采用PPH切除内痔并剥离切除外痔,治疗组术后使用肛泰软膏常规换药,对照组给于复方多粘菌素B软膏换药,对治疗后患者疗效进行总结分析。结果显示,治疗组总有效率为95.0%,对照组总有效率为60.0%,治疗组总有效率高于对照组(P<0.05)。治疗组术后在创面出血、疼痛、水肿方面优于对照组(P<0.05)。结果表明,肛泰软膏配合PPH加外痔剥离切除术治疗重度混合痔术后并发症少,远期疗效显著。

关键词：混合痔肛泰软膏吻合器痔上黏膜环切术外痔剥离切除术

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Extreme Wave Simulation with Iterative Adaptive Approach in Numerical Wave Flume

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China Ocean Engineering 2021年第1期35卷 61-71页

作者： liu dian-yong Naval Architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116023China

Extreme wave is highly nonlinear and may occur due to diverse reasons *** simulated results of extreme wave based on wave focusing,which were generated using high order spectrum method,are *** influences of the steepness,frequency bandwidth as well as frequency spectrum on focusing position shift were examined,showing that they can affect the wave focusing ***,controlled accurate generation of extreme wave at a predefined position in wave flume is a difficult but important *** this paper,an iterative adaptive approach is applied using linear dispersion theory to optimize the control signal of the *** performance of the proposed approach is numerically investigated for a wide variety of *** results demonstrate that this approach can reproduce accurate wave focusing effectively.

关键词： extreme wave wave focusing numerical wave flume iterative adaptive approach

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