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高铁酸盐体系中高价铁氧中间体对双酚A的降解研究

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现代化工 2024年第4期44卷 164-168,174页

作者：林洋仟杨学珂李贤胜杨盈殷翰墨徐西蒙昆明理工大学建筑工程学院云南昆明650500 昆明清源自来水有限责任公司云南昆明650217

以典型内分泌干扰物双酚A(BPA)为目标污染物,研究了高铁酸钾[Fe(Ⅵ)]对其的去除效果及机理。通过高效液相色谱仪、离子色谱仪等手段考察了pH、Fe(Ⅵ)投加量和共存离子等因素对BPA去除效果的影响。结果表明,在pH为8.0、Fe(Ⅵ)与BPA浓度比... 详细信息

以典型内分泌干扰物双酚A(BPA)为目标污染物,研究了高铁酸钾[Fe(Ⅵ)]对其的去除效果及机理。通过高效液相色谱仪、离子色谱仪等手段考察了pH、Fe(Ⅵ)投加量和共存离子等因素对BPA去除效果的影响。结果表明,在pH为8.0、Fe(Ⅵ)与BPA浓度比为30∶1时,反应10 min后BPA的降解率达到81.5%。Cl^(-)、SO_4^(2-)、NO^(-)_(3)、HCO^(-)_(3)等共存阴离子未影响Fe(Ⅵ)体系的氧化能力,但Ca^(2+)和Mg^(2+)因加速了Fe(Ⅵ)自分解而抑制了BPA降解。通过淬灭实验对体系中的活性氧物种进行识别,Fe(Ⅵ)及其高价铁氧中间体Fe(Ⅴ)/Fe(Ⅳ)在氧化BPA中起主导作用。在实际水体(自来水、市政二级出水和地下水)中,Fe(Ⅵ)氧化体系对BPA的降解未受到明显影响,证实其具有较高的环境适应性。

关键词：高铁酸钾双酚A 影响因素共存离子实际水体

Enhanced electrochemical performance of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3−δ)cathode via Ba-doping for intermediate-temperature solid oxide fuel cells

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Nano Research 2022年第4期15卷 3264-3272页

作者： Changkun Cai Manyi Xie ke xue Yu Shi Shuting Li Yuanyuan Liu Shengli An Hong Yang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China Inner Mongolia key Laboratory of Advanced Ceramic Materials and Devices Inner Mongolia University of Science and TechnologyBaotou 014010China School of Engineering The University of Western AustraliaPerthWA 6009Australia

La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)is recognized as one of the most promising cathode materials for the highly-desired intermediatetemperature solid oxide fuel cell(IT-SOFC)***,it is still challenged by polarization losses due to reduced operation *** this work,a series of Ba^(2+)-doped La0.6-xBaxSr0.4Co0.2Fe0.8O3-δ(LBSCFx,x=0.05,0.10,0.15,and 0.20)materials are successfully synthesized and their electrochemical performances are evaluated as a cathode for IT-SOFC *** study shows that,compared to the un-doped LSCF,the Ba^(2+)-doped LBSCF possess higher electrical conductivities at 500-800℃ and display lower polarization resistances to oxygen adsorption/*** a result,the Ni-SDC|SDC|LBSCF0.20 cell(SDC=samarium-doped cerium,Sm_(0.2)Ce_(0.8)O_(1.9))delivers a high maximum power density of 0.704 W/cm^(2)at 750℃,which is>30%higher than the Ni-SDC|SDC|LSCF *** work reveals that Ba^(2+)-doping is effective in enhancing oxygen catalytic activity of LSCF-based cathode materials,demonstrating a new and commercial-feasible strategy in developing high performance cathode materials for the IT-SOFC technology.

关键词： solid oxide fuel cell(SOFC) intermediate-temperature perovskite oxide Ba-doping La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3−δ)(LSCF)

The Changhsingian Foraminiferal Fauna of the Meishan D Section, Zhejiang, China, and their Ecostratigraphic Implications

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1299-1323页

作者： ke xue LUO Liang WEI Yi KOU Xiaohu ZHANG Zongyan HE Weihong Institute of Geological Survey China University of Geosciences China Geological Survey Chengdu Center Safety Engineering College North China Institute of Science & Technology China Geological Survey Wuhan Center School of Earth Sciences China University of Geosciences

Samples were collected continuously and systematically from Beds 2 to 30 of the Meishan D section, and nearly 4,000 foraminiferal specimens were recognized. In total, 72 species （partially including undetermined species and conformis species） in 34 genera of foraminifers were identified. Twelve foraminiferal community zones were established from Beds 2 to 27 based on the abundance, dominance, diversity, and equitability of the foraminiferal fauna and a functional morphological analysis of the dominant and characteristic species. The habitat type indicated by each community zone and the sedimentary features were used to determine the paleo-water depths and the relative changes in sea level. We generated curves of both the habitat type and the hydrodynamic conditions, which together indicate the relative changes in the paleo-water depth and the substrate features in the studied area during the Changhsingian. This study discusses the possible relationship between the foraminiferal community zones and the sea-level changes based on a statistical analysis of the foraminiferal community zones.

关键词： foraminifera Habitat type Changhsingian ecostratigraphy Meishan D section

Comprehensive recovery of Fe,Zn,Ag and In from high iron-bearing zinc calcine

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Journal of Central South University 2017年第5期24卷 1082-1089页

作者： PENG Bing PENG Ning LIU Hui xue ke LIN Dong-hong Institute of Environmental Science and Engineering School of Metallurgical Science and EngineeringCentral South UniversityChangsha 410083China Chinese National Engineering Research Centre for Control&Treatment of Heavy Metal Pollution Changsha 410083China

A beneficiation-metallurgy combination process is developed to recover Zn, Fe and to enrich In, Ag from high iron-bearing zinc calcine based on our former researches. In gaseous reductive roasting process, the roasting conditions were tested by magnetic separation of roasted product. It is found that the V_(CO)(P_(CO)/(P_(CO+CO_2)) in roasting atmosphere should be maintained below 30% to avoid the generation of zinc iron solid solution(Fe_(0.85-x)Zn_xO), which can bring a decrease of iron recovery in magnetic separation. After roasting, acid leaching and multistage magnetic separation are carried out for the recovery of Zn, Fe and enrichment of Ag and In. About 90% of zinc is extracted and 83% of iron is recovered in the whole process. The Ag mainly enters the tailings with a recovery of 76%, the Ag grade increases from 0.12 g/t in raw materials to 1.18 g/t in the tailings. However, the In mainly enters the iron concentrations and the recovery reaches 86%. This process was proved to be technically feasible and may be a favorable option in the treatment of high iron-bearing zinc material with high Ag or In content.

关键词： high iron-bearing zinc calcine reductive roasting multistage magnetic separation silver recovery indium recovery

基于多时间尺度建模自动特征提取和通道注意力机制的锂离子电池健康状态估计

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储能科学与技术 2024年第9期13卷 3059-3071页

作者：柯学洪华伟郑鹏李智诚范培潇杨军郭宇铮蒯春光武汉大学电气与自动化学院湖北武汉430072 国家电网福建省电力有限公司营销服务中心福建福州350001 国家电网福建省电力有限公司福建福州350001 国家电网福建省电力有限公司电力科学研究院福建福州350007

准确估计锂离子电池(lithium-ion battery,LIB)的健康状态(state of health,SOH)对于确保储能电站的安全稳定运行至关重要。然而,现有的数据驱动方法通常依赖手工特征提取,并且特征的时间尺度比较单一,很难进行高效且精确的电池健康状... 详细信息

准确估计锂离子电池(lithium-ion battery,LIB)的健康状态(state of health,SOH)对于确保储能电站的安全稳定运行至关重要。然而,现有的数据驱动方法通常依赖手工特征提取,并且特征的时间尺度比较单一,很难进行高效且精确的电池健康状态评估。为了解决这些问题,提出了一种基于多时间尺度建模自动特征提取和通道注意力机制的健康状态估计模型。该模型首先将充电过程信息输入多个并行的膨胀卷积模块(dilation convolution module,DCM),从不同时间尺度进行自动特征提取,获得丰富且全面的特征表示。随后,不同尺度的特征通过融合后结合门控循环单元(gated recurrent unit,GRU)提取时间序列的长期依赖关系。模型进一步融入通道注意力机制(efficient channel attention,ECA),对历史信息进行相关性动态权重分配,关注显著特征。最后,在两个公开数据集上验证了本方法的优越性,并与其他常用深度学习模型进行了比较。结果表明,本模型具有较高的SOH估计精度和良好的迁移性,两个数据集上的均方根误差分别仅为0.0110和0.0095,在跨数据集的迁移实验中均方误差仅为0.0092。

关键词：锂离子电池健康状态卷积神经网络注意力机制时间序列

Fine-scale structures and material flows of quiescent filaments observed by the New Vacuum Solar Telescope

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Research in Astronomy and Astrophysics 2015年第10期15卷 1725-1734页

作者： Xiao-Li Yan Zhi-ke xue Yong-Yuan Xiang Li-Heng Yang Yunnan Observatories Chinese Academy of Sciences key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of Sciences

Study of the small-scale structures and material flows associated with solar quiescent filaments is very important for understanding the formation and equilibrium of solar filaments. Using high resolution Ha data observed by the New Vacuum Solar Telescope, we present the structures of barbs and material flows along the threads across the spine in two quiescent filaments on 2013 September 29 and on 2012 November 2, respectively. During the evolution of the filament barb, several paral- lel tube-shaped structures formed and the width of the structures ranged from about 2.3 Mm to 3.3 Mm. The parallel tube-shaped structures merged together accompanied by material flows from the spine to the barb. Moreover, the boundary between the barb and surrounding atmosphere was very neat. The counter-streaming flows were not found to appear alternately in the adjacent threads of the filament. However, the large-scale patchy counter-streaming flows were detected in the filament. The flows in one patch of the filament have the same direction but flows in the adjacent patch have opposite direction. The patches of two opposite flows with a size of about 10＂ were alternately exhibited along the spine of the filament. The velocity of these material flows ranged from 5.6 km s^-1 to 15.0 km s^-1. The material flows along the threads of the filament did not change their direction for about two hours and fourteen minutes during the evolution of the filament. Our results confirm that the large-scale counter- streaming flows with a certain width along the threads of solar filaments exist and are coaligned well with the threads.

关键词： Sun: filaments prominences -- Sun: activity -- Sun: corona

Magnetostratigraphy and Anisotropy of Magnetic Susceptibility of the Lulehe Formation in the Northeastern Qaidam Basin

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Acta Geologica Sinica(English Edition) 2013年第2期87卷 576-587页

作者： ke xue JI Junliang ZHANG kexin KOU Xiaohu SONG Bowen WANG Chaowen Institute of Geophysics and Geomatics China University of Geosciences State key Laboratory of Biogeology and Environmental Geology China University of Geosciences China Geological Survey Nanjing Center Faculty of Earth Sciences China University of Geosciences Geological Survey of China University of Geosciences

The timing of onset of deposition of the Lulehe Formation is a significant factor in understanding the genesis of the Qaidam basin and the evolution of the Tibetan Plateau. Here, we describe a detailed magnetostratigraphic and magnetic fabric study of the middle and lower parts of the Lulehe Formation. A total of 234 samples were collected from 117 sites throughout a thickness of almost 460 m of fluvial and lacustrine deposits at the Xitieshan section in the northeastern Qaidam basin. Out of these sites, 94 sites yielded well-defined characteristic remanent magnetization components by stepwise thermal demagnetization and were used to establish the magnetostratigraphy of the studied section. Based on correlation with the geomagnetic polarity timescale, the studied section spans the period from 53.8 Ma to 50.7 Ma. Our results show a three-fold decrease in sedimentation rates as well as marked change in facies from braided river to delta and shore-shallow lake around 52.6 Ma, which suggests tectonic uplift of the northeastern Qaidam basin margin ridge was rapid at the onset of formation of the Qaidam basin and subsequently weakened after 52.6 Ma. The anisotropy of magnetic susceptibility results indicate that tectonic compression stress had reached the northeastern Tibetan Plateau by the early stages of Indo-Eurasian plate collision and that the direction of stress in the study area was NE-SW. Furthermore, a weakening of tectonic compression stress around 52.6 Ma is consistent with sedimentary records. The age of initial deposition of the Qaidam basin （around 53.8 Ma） was almost synchronous with that of the Qiangtang, Hoh Xil, Xining, and Lanzhou basins, which implies that stress was transferred rapidly through the Tibetan Plateau during or immediately after the onset of Indo-Eurasian collision.

关键词： magnetostratigraphy magnetic anisotropy Lulehe Formation Qaidam basin TibetanPlateau

Radiolarian and Detrital Zircon in the Upper Carboniferous to Permian Bancheng Formation,Qinfang Basin,and the Geological Significance

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Journal of Earth Science 2018年第3期29卷 594-606页

作者： xue ke Zongyan Zhang Jianghai Yang Huazhou Yao Likuan Zhu Weihong He Institute of Geological Survey China University of GeosciencesWuhan 430074China Wuhan Center of China Geological Survey Wuhan 430205China State key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China Zhengzhou Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological SciencesZhengzhou 450006China

The Bancheng Formation exposed along the Shift Reservoir nearby Bancheng Town, Qinfang Basin, southern Guangxi, is mainly composed of thin-bedded chert. The radiolarian assemblages in the studied section suggest it was a pelagic setting and the age of the Bancheng Formation is Late Carboniferous to Early Permian. The detrital zircon U-Pb ages from the section are characterized by a Permian peak at -282 Ma. Detrital zircon provenance analysis suggests that the Permian detrital zircons in the Bancheng Formation were likely from volcanic-magmatic arc rocks related to the subducfton of the Paleo-Tethyan Ocean. The long-lived deposition （from Upper Devonian to Middle Permian, about 125 Ma） of the radiolarian cherts in the Qinfang Basin was comparable with that deposited in Ailaoshan Ocean. The radiolarian assemblages in Qinfang Basin show a Tethyan affinity. Together with the Permian subduction-related arc volcanic rocks and the E-MORB type basalts to the northwest of the study area, our data support the existence of a Permian arc-related basin in the Qinfang area.

关键词： Qinfang Basin Bancheng Formation detrital zircon radiolarian Permian arc-related basin.

Improved Five-Parameter Exponential-Type Potential Energy Model for Diatomic Molecules

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Communications in Theoretical Physics 2019年第1期71卷 103-106页

作者： ke-xue Fu Meng Wang Chun-Sheng Jia Chengdu Shishi High School Xindu No.1 Middle School State key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

The dissociation energy and equilibrium bond length as explicit parameters are used to establish an improved five-parameter exponential-type potential energy model for diatomic molecules. We demonstrate that the five-parameter exponential-type potential is identical to the Tietz potential for diatomic molecules. It is observed that the improved five-parameter exponential-type potential can well model the internuclear interaction potential energy curve for the ground electronic state of the carbon monoxide molecule by the utilization of the experimental values of three molecular constants.

关键词： interaction potential energy improved five-parameter exponential-type potential carbon monoxide