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Efficient enrichment and selective recovery of rare earths from sulfate leachate of ion-adsorption type rare earth ore by extraction with HPOAc

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Journal of Rare Earths 2024年第11期42卷 2156-2165,I0006页

作者： Jinglu Han Yanling li songsong li Wuping liao State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China

The efficient enrichment and separation of rare earth elements(REEs) from sulfate leachates of ionadsorption type rare earth ore(IATREO) is still a *** work presents a novel extractant 2-(bis((2-ethylhexyl)oxy)phosphoryl)-2-hydroxyacetic acid(HPOAc) for the selective extraction and efficie nt enrichment of REEs from sulfate leachates of *** exhibits higher extraction ability for all fifteen REEs(Ⅲ) than naphthenic acid(NA) at pH_(ini)=1,***,it has no drawbacks of di-(2-ethylhexyl) phosphoric acid(P204) and 2-ethylhexyl phosphoric acid mono-2-ethylhexylester(P507)such as weak extraction ability towards light REEs(Ⅲ) and high stripping acidity for heavy REEs(Ⅲ).It has better separation performance for metal ion impurities than P204 and P507,especially for the typical impurity Al(Ⅲ).Furthermore,the HPOAc system has better phase separation behavior and extraction pheno mena.A simulated operation with two-stage counte r-current extraction and single-stage stripping of REEs was carried out using unsaponified *** recovery of REEs reaches 98.7%.The concentration of REEs increases from 0.44 to 130.35 g/L,indicating a nearly 300-fold ***,the content of REEs increases from 77.8 wt% to 97.6 wt%.So HPOAc has the potential to selectively recover REEs from sulfate leachates of IATREO.

关键词： Rare earths Solvent extraction Enrichment Separation Extractants

Strong stability of Nash equilibria in load balancing games

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Science China Mathematics 2014年第7期57卷 1361-1374页

作者： CHEN Bo li songsong ZHANG YuZhong Centre for Discrete Mathematics and Its Applications Warwick Business SchoolUniversity of Warwick School of Management Qufu Normal University

We study strong stability of Nash equilibria in load balancing games of m(m 2)identical servers,in which every job chooses one of the m servers and each job wishes to minimize its cost,given by the workload of the server it chooses.A Nash equilibrium(NE)is a strategy profile that is resilient to unilateral *** an NE in such a game is ***,an NE assignment is not stable against coordinated deviations of several jobs,while a strong Nash equilibrium(SNE)*** study how well an NE approximates an *** any job assignment in a load balancing game,the improvement ratio(IR)of a deviation of a job is defined as the ratio between the pre-and post-deviation *** NE is said to be aρ-approximate SNE(ρ1)if there is no coalition of jobs such that each job of the coalition will have an IR more thanρfrom coordinated deviations of the *** it is already known that NEs are the same as SNEs in the 2-server load balancing game,we prove that,in the m-server load balancing game for any given m 3,any NE is a(5/4)-approximate SNE,which together with the lower bound already established in the literature yields a tight approximation *** closes the final gap in the literature on the study of approximation of general NEs to SNEs in load balancing *** establish our upper bound,we make a novel use of a graph-theoretic tool.

关键词： load balancing game Nash equilibrium strong Nash equilibrium approximate strong Nash equilibrium

Theoretical probe into universal tetrad effect for complexation discrepancy between lanthanide elements and organophosphoric extractant diethyl phosphoric acid

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Journal of Rare Earths 2024年第6期42卷 1142-1148,I0006页

作者： Haifeng Zheng Yanling li Xuyi Zhang Jinglu Han songsong li Guolong Wu Qingshi liu Xiaojuan liu Wuping liao State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China University of Science and Technology of China Hefei230026China School of Chemistry and Chemical Engineering Nanchang UniversityNanchang330031China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China

The deep understanding of 4f-correlated electron motion behavior is experimentally limited due to similar physicochemical properties of rare earth elements(REEs).While the solvent extraction behavior originating from the continuous occupation of 4f electrons along the lanthanide family provides a particular platform to probe the 4f electrons motion behavior and its correlations to their versatile ***,the complexation between REEs and the prototypical extractant of diethyl phosphoric acid(DEP)was substantially studied based on quantum mechanical *** results firstly show that the average bond lengths between Ln and six coordinated oxygen atoms are consistent with lanthanide contraction phenomenon,and gadolinium break effect is also obviously ***,the"tetrad effect"is figured out based on the subtle discrepancy of 4f electrons occupation,namely La-Nd,Sm-Eu,Gd-Dy and ***,the main composition is 4f5d6p for La-Nd,while the discrepancy is due to the increasing electrons in the 5d shell,while it is 4f5d for *** Gd-Dy,their 4f orbitals accept little electrons and the donating electrons flow into 6s5d subshells due to the half-filled stability and the enhancement of shielding *** electrons donate into 5d6p subshells due to multiply electrons occupation of 4f orbitals for *** detailed analyses obviously clarify the"tetrad effect"along the lanthanide family due to the different variation of 4f orbital *** is expected that these microscopic understandings provide important guidance for the separation of REEs and the design of new extractants.

关键词： Theoretical calculation Rare earths 4f electron Tetrad effect Gadolinium break

LGFFN-GHI: A Local-Global Feature Fuse Network for Gastric Histopathological Image Classification

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Journal of Computer and Communications 2022年第11期10卷 91-106页

作者： songsong li Wenzhong liu Sichuan University of light Chemical Industry Zigong China

Gastric cancer remains the third most common cause of cancer-related death. Histopathological examination of gastric cancer is the gold standard for the diagnosis of gastric cancer. However, manual pathology examination is time-consuming and laborious. Computer-aided diagnosis (CAD) systems can assist pathologists in diagnosing pathological images, thus improving the efficiency of disease diagnosis. In this paper, we propose a two-branch network named LGFFN-GHI, which can classify histopathological images of gastric cancer into two categories: normal and abnormal. LGFFN-GHI consists of two parallel networks, ResNet18 and Pvt-Tiny, which extract local and global features of microscopic gastric tissue images, respectively. We propose a feature blending module (FFB) that fuses local and global features at the same resolution in a cross-attention manner. This enables ResNet18 to acquire the global features extracted by Pvt-Tiny, while enabling Pvt-Tiny to acquire the local features extracted by ResNet18. We conducted experiments on a novel publicly available subsize image database of gastric histopathology (GasHisSDB). The experimental results show that LGFFN-GHI achieves an accuracy of 96.814%, which is 2.388% and 3.918% better than the baseline methods ResNet18 and Pvt-Tiny, respectively. Our proposed network exhibits high classification performance, demonstrating its effectiveness and future potential for the gastric histopathology image classification (GHIC) task.

关键词： Deep Learning Gastric Cancer Screening Histopathological Images Transformer

The roles and mechanism of cocatalysts in photocatalytic water splitting to produce hydrogen

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Chinese Journal of Catalysis 2020年第4期41卷 642-671页

作者： Nan Xiao songsong li Xuli li Lei Ge Yangqin Gao Ning li State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum BeijingBeijing 102249China Department of Materials Science and Engineering College of New Energy and MaterialsChina University of Petroleum BeijingBeijing 102249China

Photocatalytic hydrogen(H2)evolution via water spilling over semiconductors has been considered to be one of the most promising strategies for sustainable energy supply in the future to provide non-pollution and renewable *** key to efficient conversion of solar-chemical energy is the design of an efficient structure for high charge separation and ***,cocatalysts are necessary in boosting photocatalytic H2 *** date,semiconductor photocatalysts have been modified by various cocatalysts due to the extended light harvest,enhanced charge carrier separation efficiency and improved *** review focuses on recent developments of cocatalysts in photocatalytic H2 evolution,the roles and mechanism of the cocatalysts are discussed in *** cocatalysts can be divided into the following categories:metal/alloy cocatalysts,metal phosphides cocatalysts,metal oxide/hydroxide cocatalysts,carbon-based cocatalysts,dual cocatalysts,Z-scheme cocatalysts and MOFs *** future research and forecast for photocatalytic hydrogen generation are also suggested.

关键词： Cocatalysts Photocatalytsts Hydrogen evolution Charge separation Water splitting

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台语系词的来源及演变

语言科学 2024年第5期23卷 492-508页

作者：吕嵩崧百色学院文学与传媒学院广西百色533000

台语系词很可能在唐宋产生,但当时未发展成熟,这是台语系词中固有词与汉语借词共存的主要原因。台语系词大致有:1)源于“(打)中”义动词的固有词;2)源于“成为”义动词的固有词;3)汉语借词“着”;4)汉语借词“正”;5)汉语借词“是”;以... 详细信息

台语系词很可能在唐宋产生,但当时未发展成熟,这是台语系词中固有词与汉语借词共存的主要原因。台语系词大致有:1)源于“(打)中”义动词的固有词;2)源于“成为”义动词的固有词;3)汉语借词“着”;4)汉语借词“正”;5)汉语借词“是”;以及来源不明的l?~3/le~1。它们产生(借入)时间顺序很可能是:源于“(打)中”义动词的系词→源于“成为”义动词的系词→汉语借词“正”→汉语借词“是”/“着”。l?~3/le~1具有系词功能的时间难以判断。“(打)中”义词、“正确”义词、系词同形,很可能是部分语言的共同特征。几个汉语借词中,“正”“着”的系词功能来自对壮语相应词的语义复制;“是”则是直接以系词功能借入。固有词是否演变成系词,与相应区域受汉语影响深浅紧密相关。

关键词：台语系词来源演变

Novel PtPd alloy nanoparticle-decorated g-C_3N_4 nanosheets with enhanced photocatalytic activity for H_2 evolution under visible light irradiation

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Chinese Journal of Catalysis 2019年第3期40卷 352-361页

作者： Nan Xiao songsong li Shuang liu Boran Xu Yandong li Yangqin Gao Lei Ge Guiwu Lu State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing Beijing 102249 China College of New Energy and Materials China University of Petroleum Beijing Beijing 102249 China

PtPd bimetallic alloy nanoparticle (NP)-modified graphitic carbon nitride (g-C3N4) nanosheet photocatalysts were synthesized via chemical deposition precipitation. Characterization of the photocatalytic H2 evolution of the g-C3N4 nanosheets shows that it was significantly enhanced when PtPd alloy NPs were introduced as a co-catalyst. The 0.2 wt% PtPd/g-C3N4 composite photocatalyst gave a maximum H2 production rate of 1600.8 μmol g^–1 h^–1. Furthermore, when K2HPO4 was added to the reaction system, the H2 production rate increased to 2885.0 μmol g^–1 h^–1. The PtPd/g-C3N4 photocatalyst showed satisfactory photocatalytic stability and was able to maintain most of its photocatalytic activity after four experimental photocatalytic cycles. In addition, a possible mechanism for the enhanced photocatalytic activity was proposed and verified by various photoelectric techniques. These results demonstrate that the synergistic effect between PtPd and g-C3N4 helps to greatly improve the photocatalytic activity of the composite photocatalyst.

关键词： g-C3N4 nanosheets PtPd alloy nanoparticles H2 evolution Photocatalysis

玻色玻色-爱因斯坦凝聚体中三体和四体相互作用对自旋压缩和量子纠缠的影响研究

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量子电子学报 2023年第4期40卷 519-527页

作者：李嵩松南昌师范学院物理系江西南昌330032

自旋压缩和量子纠缠在量子信息处理中有着极为重要而广泛的应用,因此利用玻色-爱因斯坦凝聚中的多体相互作用产生自旋压缩和量子纠缠具有重要意义。研究了玻色-爱因斯坦凝聚的密度较大时,三体相互作用和四体相互作用对自旋压缩和量子纠... 详细信息

自旋压缩和量子纠缠在量子信息处理中有着极为重要而广泛的应用,因此利用玻色-爱因斯坦凝聚中的多体相互作用产生自旋压缩和量子纠缠具有重要意义。研究了玻色-爱因斯坦凝聚的密度较大时,三体相互作用和四体相互作用对自旋压缩和量子纠缠的影响,利用短时近似解析计算了自旋压缩参数和两种不同的纠缠参数。结果表明:在动力学过程中,三体相互作用和四体相互作用能诱导产生自旋压缩和量子纠缠;且四体相互作用比三体相互作用能产生更强的自旋压缩和更好的量子纠缠。

关键词：量子光学量子纠缠自旋压缩短时近似玻色-爱因斯坦凝聚

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基于各向异性冷轧纯钛薄带的屈服行为研究

稀有金属材料与工程 2023年第9期52卷 3213-3220页

作者：李伟于辉李松松杨柳罗许燕山大学机械工程学院河北秦皇岛066004 攀钢集团攀枝花钢铁研究院有限公司四川攀枝花617000

传统冷轧薄带理论中常将轧件假设为理想的各向同性材料,往往以RD-TD面内屈服应力进行轧制计算,而并未考虑薄带存在各向异性的问题。为此基于单轴拉伸试验和晶体粘塑性自洽模型(VPSC)开展了纯钛薄带的屈服行为研究,利用等塑性功和屈服准... 详细信息

传统冷轧薄带理论中常将轧件假设为理想的各向同性材料,往往以RD-TD面内屈服应力进行轧制计算,而并未考虑薄带存在各向异性的问题。为此基于单轴拉伸试验和晶体粘塑性自洽模型(VPSC)开展了纯钛薄带的屈服行为研究,利用等塑性功和屈服准则构建了以RD拉伸屈服应力为参考的屈服轨迹,并通过冷轧过程模拟探究了各向屈服应力的差异对轧制变形区特征的影响规律。结果表明:基面双峰织构纯钛薄带的屈服应力依次为ND最大、TD次之、RD最小,而屈服应力各向异性导致传统薄带轧制理论的计算结果与实际结果之间存在很大误差。为方便应用以RD拉伸屈服应力为参考,基于Hill48各向异性屈服准则对传统冷轧薄带理论中的Fleck轧制模型进行修正,并通过轧制试验验证了修正结果的必要性和可靠性。

关键词：纯钛薄带各向异性屈服应力屈服准则变形区特征