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Fe^(3+)对细粒菱锌矿和方解石分散行为的影响

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中国有色金属学报 2024年第3期34卷 923-933页

作者：马子龙潘文峰廖寅飞曹亦俊李树磊陈小国中国矿业大学国家煤加工与洁净化工程技术研究中心徐州221116 中国矿业大学化工学院徐州221116 郑州大学化工学院郑州450001

方解石矿泥的覆盖和高价金属阳离子的存在是影响粒径−20μm细粒菱锌矿浮选效果的关键因素,两者通过改变菱锌矿的表面性质而恶化其分散性和浮选环境。本文选择菱锌矿浮选中常见的Fe^(3+)为研究对象,通过吸附试验、Zeta电位、XPS分析,DLV... 详细信息

方解石矿泥的覆盖和高价金属阳离子的存在是影响粒径−20μm细粒菱锌矿浮选效果的关键因素,两者通过改变菱锌矿的表面性质而恶化其分散性和浮选环境。本文选择菱锌矿浮选中常见的Fe^(3+)为研究对象,通过吸附试验、Zeta电位、XPS分析,DLVO理论计算等考察Fe^(3+)对菱锌矿和方解石的分散行为规律和作用机理。结果表明:两种矿物对Fe^(3+)的吸附行为基本一致,但Fe^(3+)对菱锌矿分散行为的影响程度大于Fe^(3+)对方解石分散行为的影响。当Fe^(3+)浓度为5×10^(−4)mol/L时,菱锌矿分散行为被完全破坏。溶液化学及DLVO理论计算结果表明,Fe^(3+)吸附在矿物表面形成了羟基络合物或Fe(OH)3,导致菱锌矿颗粒间作用力小于方解石的,这是Fe^(3+)破坏菱锌矿分散行为、影响粒径−20μm细粒菱锌矿浮选的主要原因。

关键词： Fe^(3+) 细粒菱锌矿方解石分散行为

Structural and electronic properties of bastnaesite and implications for surface reactions in flotation

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Journal of Rare Earths 2020年第3期38卷 332-338页

作者： Shiming Cao Yijun Cao zilong ma Yinfei Liao Xiaolin Zhang School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhau 221116China Henan Province Industrial Technology Research Institute of Resources and materials Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Complex Nonferrous Meal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China

The structural and electronic properties of bastnaesite were studied by using the first-principles method based on the density functional theory(DFT).The geometry structure of bastnaesite was first optimized,and then the Mulliken populations,electron density and density of states were calculated and further analyzed in *** calculation results reveal that it mainly ruptures along the ionic Ce-O and Ce-F bonds during the cleavage of bastnaesite,leaving≡Ce^+,≡F^-and≡CO3^-dangling bonds exposed on the cleavage surface of *** with contact angle measurement,surface complexation theory and XPS analysis,the implications of structural and electronic properties on bastnaesite flotation reactions were *** hydration of exposed strong ionic bond on cleavage surface results in hydrophilic *** to surface complexation theory,the formed surface groups are≡CeOH^0,≡CO3 H^0 and≡FH^0 *** investigated metal ions and flotation reagents complex with surface≡CeOH^0 groups,while≡CO3H^0 and≡FH^0 groups are not involved in the *** high activity of Ce atoms facilitates these surface reactions.

关键词： Bastnaesite Density functional theory calculation Electronic property Flotation Rare earths

Biochar increases soil microbial biomass with changes in extra-and intracellular enzyme activities:a global meta-analysis

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Biochar 2020年第1期2卷 65-79页

作者： Prem Pokharel zilong ma Scott X.Chang Department of Renewable Resources University of Alberta442 Earth Sciences BuildingEdmonton T6G 2E3Canada

Biochar application to soil has been proposed as a potential management strategy to enhance soil carbon(C)sequestration,reduce greenhouse gas emission,improve soil quality,and increase crop *** effects of biochar on soil microbial and enzyme activities are integrally linked to the potential of biochar in achieving these *** conducted a global meta-analysis to assess the effects of biochar on soil microbial biomass C and nitrogen(N)and the activities of 12 enzymes,and identify key factors affecting those soil microbial properties using 964 data points from 72 *** found that biochar effects on enzyme activities vary widely with soil type,biochar property and the type of enzyme *** significantly increased microbial biomass C(MBC)and urease,alkaline phosphatase and dehydrogenase activities by 21.7%,23.1%,25.4%and 19.8%,respectively,with no significant negative effects on any of the enzymes analyzed in this *** application was more effective in increasing MBC and enzyme activities in soils with low pH(10)and low C/N ratio(matic *** study also shows that biochars can be designed to achieve specif

关键词： Edaphic factor Nutrient mineralization Pyrolysis Soil health Soil management

滨海基岩型城市三维地质模型建设方法对比分析——以青岛市为例

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吉林地质 2024年第2期43卷 109-116页

作者：徐锐张志芹王洋马子龙解小东夏伟强何鹏青岛地质工程勘察院(青岛地质勘查开发局) 山东青岛266100 中国石油大学(华东)地球科学与技术学院山东青岛266100 自然资源部滨海城市地下空间地质安全重点实验室山东青岛266100

三维地质模型建设在地质环境评价、深部地质找矿以及城市地下空间开发与安全利用方面扮演着越来越重要的作用,其技术突破为透明城市和智慧城市的发展提供了重要的地质支撑。青岛市作为滨海基岩型城市的代表先后采用剖面交互式建模、Bent... 详细信息

三维地质模型建设在地质环境评价、深部地质找矿以及城市地下空间开发与安全利用方面扮演着越来越重要的作用,其技术突破为透明城市和智慧城市的发展提供了重要的地质支撑。青岛市作为滨海基岩型城市的代表先后采用剖面交互式建模、Bentley MicroStation v8i平台建模、显式构造界面建模和隐式建模四种方法探究三维地质模型建设方法的优劣,得出显式构造界面建模方法是目前最为成熟的建模方法,模型建设效果较好,但修改更新困难;隐式建模方法发展较晚,模型更新速度较快,结合实际地质情况调整和完善算法后会成为未来的主流建模理论方法。此外,三维地质建模标准地层和模型尺度的约束不够明确,应尽快出台相应规范进行说明。

关键词：滨海基岩型城市三维地质模型隐式建模方法显式建模方法

The IDD Transcription Factors:Their Functions in Plant Development and Environmental Response

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Phyton-International Journal of Experimental Botany 2024年第1期93卷 63-79页

作者： Jing Liu Defeng Shu zilong Tan Mei ma Huanhuan Yang Ning Guo Shipeng Li Dayong Cui School of Life Sciences Qilu Normal UniversityJinan250200China School of Life Sciences Shandong Normal UniversityJinan250014China

INDETERMINATE-DOmaIN proteins(IDDs)are a plant-specific transcription factor family characterized by a conserved ID domain with four zinc finger *** studies have demonstrated that IDDs coordinate a diversity of physiological processes and functions in plant growth and development,including floral transition,plant architecture,seed and root development,and hormone *** this review,we especially summarized the latest knowledge on the functions and working models of IDD members in Arabidopsis,rice,and maize,particularly focusing on their role in the regulatory network of biotic and abiotic environmental responses,such as gravity,temperature,water,and *** these mechanisms underlying the function of IDD proteins in these processes is important for improving crop yields by manipulating their ***,the review offers valuable insights into the functions and mechanisms of IDD proteins in plants,providing a foundation for further research and potential applications in agriculture.

关键词： INDETERMINATE DOmaIN flowering time root development shoot gravitropism plant immunity hormonal signaling environmental responses

Propagation of positive, negative, and recoil leaders in upward lightning flashes

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Earth and Planetary Physics 2019年第2期3卷 102-110页

作者： XiuShu Qie ShanFeng Yuan HongBo Zhang RuBin Jiang ZhiJun Wu MingYuan Liu ZhuLing Sun YunJiao Pu JinLiang Li Abhay Srivastava zilong ma GaoPeng Lu Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO) Institute of Atmospheric Science Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of information Science & Technology College of Earth and Planetary Science University of Chinese Academy of Sciences Fujian Meteorological Service Center Fujian Meteorological Bureau

Leader propagation is a fundamental issue in lightning physics. The propagation characteristics of positive leaders and negative leaders are summarized and compared based on data from high-speed camera and electromagnetic field in rocket-triggered lightning and tower-initiated lightning discharges; available channel base current data recorded in rocket-triggered lightning are also used. The negative leaders propagate in a stepped fashion accompanied by many branches. The stems ahead of the negative leader tip determine the manner and direction of the leader propagation, and even the branching and winding of the lightning channel. The impulsive current, electromagnetic field, and related optical images suggest that the positive leader may develop in a step-like fashion at its initial stage of triggered lightning. However, the stepping processes of the positive leader are obviously different from those of the negative leader. Tower-initiated lightning revealed that the most conspicuous characteristics of the stepwise positive leader involve the intermittent brush-like corona zone in front of the leader tip and the luminosity enhancement of the channel behind the tip. In rockettriggered lightning flashes, the charge transferred during an individual step for the negative leader was nearly an order greater than for the positive counterpart. The successive streamers ahead of the leader tip are essential for both negative and positive leader propagation, and the stems could be formed from one or more streamers in the previous negative streamer zone with the main leader channel dim. High-resolution observation of tower lightning also revealed a new type of bidirectional recoil leader, with polarity contrary to the traditional one, traversing in negative channels associated with tower-initiated and rocket-triggered lightning.

关键词： lightning propagation negative leader positive leader recoil leader

列主元SVD-QR方法修剪策略参数调整的D-FNN算法研究

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中山大学学报（自然科学版） 2013年第2期52卷 8-13页

作者：张德丰马子龙佛山科学技术学院计算机系广东佛山528000 哈尔滨工业大学电子工程系黑龙江哈尔滨150001

针对动态模糊神经网络,提出了列主元SVD-QR方法修剪策略与参数调整的新算法。其中采用列主元SVD-QR方法修剪策略从给定的规则库中提取最重要模糊规则,使得网络结构不会持续增长,避免了过拟合及过训练现象;采用扩展的卡尔曼滤波方法把全... 详细信息

针对动态模糊神经网络,提出了列主元SVD-QR方法修剪策略与参数调整的新算法。其中采用列主元SVD-QR方法修剪策略从给定的规则库中提取最重要模糊规则,使得网络结构不会持续增长,避免了过拟合及过训练现象;采用扩展的卡尔曼滤波方法把全局算法划分成线性和非线性部分,线性和非线性参数可以分别被更新,从而可以达到快速的学习速度。通过对血压的控制来验证所提出算法的有效性,结果证明了列主元SVD-QR方法修剪策略参数调整的D-FNN算法具有良好的性能。

关键词：动态模糊神经网络修剪策略参数调整血压控制

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高精度自动装料计量系统设计与实现

食品工业 2020年第7期41卷 182-184页

作者：马子龙广西机电职业技术学院南宁530007

食品机械自动计量系统具有速度快、精度高的优点,在食品包装生产中起着关键性作用。在分析食品机械自动计量系统工作原理的基础上,建立自动计量系统数学模型。基于迭代控制,提出了一种提前停止下料的控制策略,以减小空中余料对计量精度... 详细信息

食品机械自动计量系统具有速度快、精度高的优点,在食品包装生产中起着关键性作用。在分析食品机械自动计量系统工作原理的基础上,建立自动计量系统数学模型。基于迭代控制,提出了一种提前停止下料的控制策略,以减小空中余料对计量精度的影响。基于ARM处理器,搭建了计量系统电路,包括称重传感器、信号采集、信号滤波、信号转换、数据处理等单元。最后,进行试验研究。结果表明:所述自动计量系统精度比较高,最大偏差只有0.3 g,计量精度能够达到99.9%,可满足包装等行业对计量装置的要求。另外,自动计量系统效率比较高,每分钟计量次数可以达到160次,达到计量高精度标准。

关键词：自动计量迭代控制 ARM 食品机械

Characterization and evolution of conserved miRNA through duplication events in date palm(Phoenix dactylifera)

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Characterization and evolution of conserved miRNA through du...