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气流分选技术研究进展

洁净煤技术 2024年第1期30卷 22-30页

作者：朱学帅孙涛宋昭严书劢阮乐怡柏思航徐慧远韦鲁滨中国矿业大学(北京)化学与环境工程学院北京100083 宜宾天原科创设计有限公司综合管理部四川宜宾644000

双碳背景下,气流分选技术因污染低、成本低、不用水、投资省、工艺简单等优势备受关注。为提升气流分选技术在多领域、多地区、多工况的适应性,解决气流分选物料适用范围窄、细粒分选效率低、设备大型化难等问题迫在眉睫。围绕气流分选... 详细信息

双碳背景下,气流分选技术因污染低、成本低、不用水、投资省、工艺简单等优势备受关注。为提升气流分选技术在多领域、多地区、多工况的适应性,解决气流分选物料适用范围窄、细粒分选效率低、设备大型化难等问题迫在眉睫。围绕气流分选理论、技术应用和技术改进3方面系统评述气流分选技术研究进展。首先,介绍了气流分选技术原理,分析气流分选过程颗粒受力及分选理论进展;其次,综述了气流分选在固废、矿业、农业等领域的应用进展,并评析了技术优势和技术短板;再次,系统分析了气流分选供风方式优化和设备结构优化等技术改进进展;最后,给出了通过单体并联和相似放大准则提高设备处理量,通过预干燥、分选干燥一体化、改进入料方式提高潮湿物料适应性与分散性,通过窄粒级分选和保持物料形状一致性的预处理过程提高细粒和薄片物料分选效率等路径。展望了未来气流分选技术在线检测与控制智能化、分选装备大型化、分选效率精细化、分选工艺联合化等方面的发展方向,为气流分选技术进一步研究和推广应用提供重要依据。

关键词：气流分选技术结构优化相似放大准则分选干燥一体化窄粒级

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我国梅树上病毒及类病毒的检测和鉴定

植物保护 2024年第1期50卷 152-158页

作者：张煜泓徐惠媛战斌慧卢美光李世访张志想中国农业科学院植物保护研究所植物病虫害综合治理全国重点实验室北京100193

目前,我国梅树上的病毒种类及发生情况仍不完全清楚。本研究从北京、武汉、南京和无锡的梅园中采集了64份疑似感染病毒的叶片样品,通过RT-PCR和斑点杂交,对7种病毒和2种类病毒进行了检测。共检测到6种病毒和1种类病毒。其中,李属坏死环... 详细信息

目前,我国梅树上的病毒种类及发生情况仍不完全清楚。本研究从北京、武汉、南京和无锡的梅园中采集了64份疑似感染病毒的叶片样品,通过RT-PCR和斑点杂交,对7种病毒和2种类病毒进行了检测。共检测到6种病毒和1种类病毒。其中,李属坏死环斑病毒(prunus necrotic ringspot virus, PNRSV)和桃潜隐花叶类病毒(peach latent mosaic viroid, PLMVd)为我国梅树上的首次检出。PNRSV、亚洲李属病毒2号(Asian prunus virus 2, APV2)、桃叶痘伴随病毒(peach leaf pitting-associated virus, PLPaV)的检出率高于30%。综合考虑病毒的分布及检出率,PLPaV、APV2、PNRSV和李树皮坏死茎痘伴随病毒(plum bark necrosis stem pitting-associated virus, PBNSPaV)是武汉、南京和无锡梅树上的主要病毒。此外,通过克隆和测序,获得了PLMVd和梅树病毒A(mume virus A, MuVA)的基因组,PLPaV的RNA1组分和PNRSV外壳蛋白(CP)基因序列。序列比较分析显示,我国PLMVd梅分离物和PNRSV梅分离物与我国桃分离物亲缘关系最近,表明PLMVd和PNRSV可能在梅和桃树间交互侵染;我国MuVA梅分离物序列与日本梅分离物序列的相似性高达98.56%;PLPaV梅分离物与我国桃分离物之间序列变异较大。上述结果不仅进一步明确了我国梅树上的病毒及类病毒种类和分布情况,而且有助于深入了解它们的流行与传播。

关键词：梅树核果类果树病毒类病毒检测

Organic-Inorganic Interaction Recorded by Polycyclic Aromatic Steranes in Continental Epithermal Ore Deposits

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 327-336页

作者： xu huiyuan LIU Quanyou JIN Zhijun ZHU Dongya MENG Qingqiang LI Pengpeng ZHU Biqing State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Petroleum Exploration&Production Research Institute SINOPECBeijing 100083China Institute of Energy School of Earth cand Space SciencesPeking UniversityBeijing 100871China

Continental epithermal ore deposits are commonly associated with sedimentary organic matter,oils or solid *** organics embedded in mineral deposits can convey valuable information of the ore ***,the extent to which the formation of ore minerals was recorded by organic compounds remains largely unknown,as also is how metal-rich ores interfere with the molecular proxies in the temperature regime envisaged for hydrothermal *** molecular compositional changes of various polycyclic aromatic steranes and polycyclic aromatic hydrocarbons and compounds derived from the Jinding Pb/Zn deposit,SW China provide new *** regular steranes are present as *** transformation from polycyclic aromatic steranes to unsubstituted polycyclic aromatic hydrocarbons is observed to show an increased trend with increasing hydrothermal alteration levels;this is consistent with the transformation from unsubstituted polycyclic aromatic hydrocarbons to heterocyclic ***(aromatization)of polycyclic biological compounds and hydrodecyclization(dearomatization)of polycyclic aromatic compounds are two important reaction pathways in hydrothermal systems with moderate *** detailed investigation of organicinorganic interactions of two groups of polycyclic compounds with metal-rich ores provides insights into the questions on how and to what extent the formation of Pb/Zn deposits can be recorded by *** work will improve our understanding of carbon reduction,oxidation or condensation in the deep Earth and the carbon exchange between the Earth's crust and mantle,and may shed light on the processes for ultra-deep hydrocarbon exploration.

关键词： petroleum resources organic-inorganic interaction biomarker polycyclic compounds hydrothermal environment

信道估计误差下的深度人工噪声预编码生成方法

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太赫兹科学与电子信息学报 2024年第1期22卷 39-45页

作者：宋晓岩刘友江徐慧远霍飞向中国工程物理研究院电子工程研究所四川绵阳621999

基于人工噪声的物理层安全通信系统,传统人工噪声通常采用推导得到的闭式表达式或最优化方法数值求解生成,要求输入准确的传输信道矩阵信息,才能保证通信系统的保密性。但实际环境中存在的信道估计误差会导致人工噪声预编码误差,从而降... 详细信息

基于人工噪声的物理层安全通信系统,传统人工噪声通常采用推导得到的闭式表达式或最优化方法数值求解生成,要求输入准确的传输信道矩阵信息,才能保证通信系统的保密性。但实际环境中存在的信道估计误差会导致人工噪声预编码误差,从而降低通信系统保密容量。为此提出一种基于深度学习的人工噪声预编码生成方法,通过将有误差的信道估计信息作为输入,与无估计误差情况下传统数值求解得到的预编码矩阵进行拟合,训练得到可适应信道估计误差的深度神经网络。仿真表明,该方法在信道估计有误差时的保密性能与鲁棒性优于传统人工噪声生成系统;相比于其他深度学习方法在物理层安全的应用,所提方法具有更快的收敛速度。

关键词：人工噪声深度学习物理层安全预编码

Tuning redox activity through delithiation induced protective layer and Fe-O coordination for Li-rich cathode with improved voltage and cycle performance

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Journal of Energy Chemistry 2022年第8期31卷 266-276,I0008页

作者： Kanghui Hu Li Ren Weifeng Fan Bing Zhang Meihua Zuo Yanhui Zhang Genpin Lv huiyuan xu Wei Xiang Xiaodong Guo College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059SichuanChina Yibin Libode New Materials Co. Ltd.Yibin 644200SichuanChina Shaoguan HEC Technology R&D Co. Ltd.Ruyuan 512000GuangdongChina Yibin Tianyuan Grp Co. Ltd.Yibin 644200SichuanChina School of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina

Li-rich layered transition metal oxides are one of the most promising cathode materials for their high energy ***,the cathodes usually suffer from severe potential dropping and capacity fading during cycling,which are associated with the surface oxygen release and accompanied by cation densification and structural ***,an integrative approach of simultaneous constructing uniform 3d Fe-ion doping in the transition metal layer and Li-rich Li_(5)FeO_(4) shell to grab the oxygen and prevent interfacial side reactions is *** introduction of Fe induces higher redox potential and stronger 3 d Fe-O_(2)p covalent bond,triggering reversible anionic redox via a reductive coupling *** the delithiated product of Li-rich Li_(5)FeO_(4) not only acts as a protective layer alleviating the side reactions but also enhances the surface kinetic *** the benefit of promoted reversibility of oxygen redox and enhanced surface stability,the cathode exhibits high reversible capacity and superior cycle *** function theory calculation indicates that the O_(2)p non-bonding state in the cathode incorporated with Fe sits at a lower energy band,resulting in higher energy storage voltage and improved oxygen ***,the modified cathode exhibits a discharge specific capacity of 307 m A h g^(-1)(1 C=250 m A g^(-1)),coulombic efficiency of 82.09%in the initial cycle at 0.1 C and 88.34%capacity retention after 100 cycles at 1 *** work illustrates a strategy that could simultaneously enhance oxygen redox reversibility and interface stability by constructing lattice bond coordination and delithiation induced protective layer to develop Li-rich materials with high reversible capacity and long lifespan.

关键词： Li-rich cathode Lattice oxygen evolution Tuning redox activity Interface modification

Catalytic properties of Cu/Co/Zn/Zr oxides prepared by various methods

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Journal of Natural Gas Chemistry 2008年第4期17卷 397-402页

作者： Limin Shi Wei Chu Siyu Deng huiyuan xu School of Chemical Engineering Sichuan University Chengdu 610065 Sichuan China

The new Cu-Co based （Cu/Co/Zn/Zr） catalysts for higher-alcohol synthesis were prepared using coprecipitation method, plasma enhanced method and reverse coprecipitation method under ultrasound irradiation. The catalysts were investigated by the means of BET, SEM, XRD, H2-TPR and XPS. Catalytic properties of the catalysts prepared by various methods were examined using CO hydrogenation reaction. It was found that plasma enhanced method and reverse coprecipitation method under ultrasound irradiation were both effective in enhancing the catalytic properties of Cu/Co/Zn/Zr mixed oxides. The small particle size, high dispersion of active components, the improvement of specific surface area and surface contents of active phases could account for the excellent performance of the experimental Cu/Co/Zn/Zr catalysts.

关键词： higher alcohols reverse coprecipitation plasma catalytic activity

Promoter effect of La2O3 on gold catalyst with different textural structures

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Journal of Energy Chemistry 2016年第5期25卷 854-860页

作者： huiyuan xu Jingjie Luo Shenying xu Denglei Zhu Wei Chu Department of Chemical Engineering Yibin UniversityYibin 644000 SichuanChina Department of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina

Silica supported gold nanoparticles were synthesized and promoted by lanthanum oxide as dopant. The influences of LaOand silica textural structure on the gold dispersion, formation of active species, crystalline composition and the reacting role of dopants were studied in detail. The characterization results suggested that the dispersion of gold nanoparticles depended on the textural structure of silica without lanthanum oxide doping where small mesopores are more preferable to disperse gold nanoparticles. The addition of lanthanum oxide largely increased the dispersion of gold nanoparticles and oxygen active sites independent of the textural structure of silica support. The interaction between lanthanum oxide and silica enhanced by the synergy facilitated the release of oxygen vacancies and transition of active oxygen species. In addition, the chemical properties were greatly changed after lanthanum oxide addition which was only inconspicuously impacted by the initial textural structure of silica supports, shedding light on the further design of economic gold catalyst based on simple synthesis method.

关键词： Gold catalysis Catalyst design Au-metal synergy CO oxidation

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地球多层圈有机—无机相互作用的资源效应

天然气地球科学 2024年第5期35卷 741-762页

作者：刘全有朱东亚孟庆强宋玉财吴小奇李鹏许汇源彭威龙黄晓伟刘佳宜魏永波金之钧北京大学能源研究院北京100871 中国石化石油勘探开发研究院北京102206 中国地质科学院地质研究所北京100037 中国科学院地质与地球物理研究所北京100029

地球内部不同层圈相互作用过程中的物质循环和能量传递对浅层盆地内部多种类型资源的形成及富集具有显著影响。深部地质作用过程与浅部资源效应这一核心科学问题备受关注,其中在深部流体/熔体物质传输影响下的有机—无机相互作用及资源... 详细信息

地球内部不同层圈相互作用过程中的物质循环和能量传递对浅层盆地内部多种类型资源的形成及富集具有显著影响。深部地质作用过程与浅部资源效应这一核心科学问题备受关注,其中在深部流体/熔体物质传输影响下的有机—无机相互作用及资源效应是关键所在。梳理了地球多层圈有机—无机相互作用对盆内多种资源的影响机理。在深部流体/熔体活动背景下,有机—无机相互作用主要通过形成利于富有机质烃源岩发育的沉积环境、提供促进生烃的物质能量、产生改造储层性质的流体环境和影响油气组分的聚集效果的方式控制油气资源的形成和聚集;深部流体携带地球深部的气体组分(CH_(4)、H_(2)、CO_(2)等)和热能进入盆地促使了天然氢气和地热资源潜力的形成;深部物质为铀矿提供铀源,富铀流体在生物作用和含烃流体作用下形成砂岩型铀矿;深部流体活动对煤矿资源的形成和变质也产生了较大影响。未来针对地球多层圈有机—无机相互作用的研究应当突破盆地限制,在地球系统的背景下围绕层圈物质和能量传输、盆内与盆外一体化展开。重点对非生物烷烃气成因、工业聚集和天然富(含)氢气藏的成因、富集、潜在勘探区评价、地质储存开展深入研究,助力推进中国能源转型和绿色发展。

关键词：有机—无机相互作用深部流体油气天然氢地热资源固体矿产资源

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Influence of MgO contents on silica supported nano-size gold catalyst for carbon monoxide total oxidation

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Journal of Natural Gas Chemistry 2011年第5期20卷 498-502页

作者： huiyuan xu Weiyi Li Shuyong Shang Chunrong Yan Department of Chemical Engineering Yibin University Yibin 644000 Sichuan China Department of Chemical Engineering Stchuan University Chengdu 610065 Sichuan China

A series of nano-size gold catalysts were prepared by deposition-precipitation method using silica material promoted with different amounts of MgO as the carrier. The influences of MgO addition on the structure and property of the nano-size gold catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, O2 temperature-programmed desorption （O2-TPD）, and inductively coupled with plasma atomic emission spectroscopy （ICP-AES） techniques. The total oxidation of CO was chosen as the probe reaction. The results suggest that for the gold catalysts supported on the silica material after MgO modification, the size of the gold particles is pronouncedly reduced, the oxygen mobility is enhanced, and the catalytic activity for low-temperature CO oxidation is greatly improved. The gold catalyst modified by 6 wt% MgO （Mg/SiO2 weight ratio） shows higher CO oxidation activity, over which the temperature of CO total oxidation is lower about 150 K than that over the silica directly supported gold catalyst.

关键词： new nano-size gold catalyst CO oxidation MgO SiO2 structure activity relationship