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Adsorption of rare earth elements on organic matter in coal

Journal of Rare Earths 2023年第7期41卷 1108-1115,I0005页

作者： xiaorui wang Wei Cheng Renda Xu College of Mining Guizhou UniversityGuiyang 550025China National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas Guiyang 550025China Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025China

The occurrence modes of rare earth elements(lanthanide and yttrium,abbreviated as REY) in coal are impo rtant both for coal geochemistry studies and the application potential of REY as a by-product of coalbased *** this study,the adsorption behaviors of REY on organic matter in coal were investigated by leaching tests using REY solution and ultra-low ash coal *** this basis,the adsorption mechanism of REY on organic matter in coal was also studied by molecular simulation *** leaching tests show that the organic matter in coal has a relatively strong adsorption capacity for REY,and that the average adsorption rate or the net adsorption amount of heavy rare earth elements(HREY:Gd,Tb,Y,Dy,Ho,Er,Tm,Yb and Lu) is always higher than that of the light rare earth elements(LREY:La,Ce,Pr,Nd,Sm and Eu).A molecular model of humic acid(HA) was constructed and the adsorption amount between REY and HA was *** results show that the theoretical adsorption rate of HREY(84.88%) is higher than that of the LREY(84.00%).The analysis of the adsorption distances between REY atoms and various functional groups on HA molecules shows that the minimum adsorption distance of LREY is 0.372 nm on average,which is larger than that of HREY(0.368 nm),indicating that the adsorption capacity of the latter is *** addition,a coal molecule(C_(18)H_(22)O) was also constructed to investigate the adsorption characteristics of various REY atoms on the *** a result,it is found that the average binding ene rgy and bond length between the hydroxyl functional group and LREY atoms are 0.12469 Ha(Hartree,the unit of energy in the atomic unit system) and 0.1407 nm,respectively,while for HREY,0.12883 Ha and 0.1121 nm,*** confirms that HREY is more stable than LREY in binding on organic matter in *** conclude,both leaching tests and molecular simulation calculations reveal that REY has a strong adsorption affinity for organic matter in coal,and

关键词： Coal Rare earth elements Adsorption characteristics Leaching Molecular simulation

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Analytic S-Shaped Temperature Dependence of Peak Positions of the Localized-State Ensemble Luminescence and Application in the Analysis of Luminescence in Non-and Semi-Polar InGaN/GaN Quantum-Wells Micro-Array

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Chinese Physics Letters 2022年第10期39卷 50-54页

作者： xiaorui wang Shijie Xu Department of Physics and Shenzhen Institute of Research and Innovation(HKU-SIRI)The University of Hong KongPokfulam RoadHong KongChina Department of Optical Science and Engineering School of Information Science and TechnologyFudan UniversityShanghai 200438China

Two analytic expressions of temperature-dependent peak positions employing the localized-state ensemble(LSE)luminescence model are deduced for the cases ofΔE=E_(a)−E_(0)>0 and<0,respectively,under the firstorder approximation of Taylor’s ***,the deduced formulas are applied to examine the experimental variable-temperature photoluminescence data of non-and semi-polar InGaN/GaN quantum-wells(QWs)array by jointly considering the monotonic bandgap shrinking described by Passler’s empirical formula.S-shaped temperature dependence of luminescence peaks of both non-and semi-polar QWs is well reproduced with the analytic *** a result,the localization depths are found to be 31.5 and 32.2 meV,respectively,for nonand semi-polar QWs.

关键词： InGaN/GaN luminescence Polar

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Oxygen vacancy-boosted thermocatalytic CO_(2) hydrogenation:Engineering strategies,promoting effects and mediating mechanisms

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Journal of Energy Chemistry 2024年第12期99卷 393-408页

作者： Guiming Xie xiaorui wang Xianfeng Li Yunming Fang Runduo Zhang Zhou-jun wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry&Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaChina

Thermocatalytic CO_(2) hydrogenation with"green"H_(2) is one of the most promising carbon-negative technologies,wherein oxygen vacancy engineering serves as a novel strategy to boost the catalytic performance of oxide-containing *** provide theoretical guidance and promote technical progress in this important field,the status and prospect of oxygen vacancy-boosted thermocatalytic CO_(2) hydrogenation have been thoroughly reviewed ***,fundamentals including origin,construction,characterization,and function of oxygen vacancies will be systematically summarized and oxygen vacancy-boosted hydrogenation reactions including methanation,reverse water-gas shift(RWGS),methanol synthesis,and other hydrogenation processes will be comprehensively *** addition,challenges and opportunities from the perspective of engineering strategies,promoting effects,and mediating mechanisms of oxygen vacancies will be succinctly ***,this review is expected to gain more insights into the role of oxygen vacancies and shed new light on the design of efficient oxide-containing catalysts.

关键词： Oxygen vacancies Carbon dioxide Hydrogen Thermocatalysis Oxide-containing catalysts

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Supercapacitors as redox mediators for decoupled water splitting

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Chinese Chemical Letters 2023年第2期34卷 481-484页

作者： Mingrui Guo Jing Zhan Zekun wang xiaorui wang Zhang Dai Ting wang College of Chemistry and Chemical Engineering Institute for Sustainable Energy and ResourcesQingdao UniversityQingdao 266071China National Engineering Research Center for Colloidal Materials School of Chemistry and Chemical EngineeringShandong UniversityJi'nan 250100China Shandong Shengtong Optical Materials Technology Co. Ltd.Dongying 257500China

With the help of the redox mediator, decoupled water-splitting allows O_(2)and H_(2)to be produced at different times, at different rates, and even in different cells, which promotes both the operation safety and the utilization of renewable power sources. However, the current densities and stabilities of these redox mediators are commonly low, which require further improvements for practical applications. Here, we propose to use supercapacitors as solid state redox mediators for decoupled water splitting. For demonstration, Na_(0.5)MnO_(2)(pseudocapacitor) and active carbon(double layer capacitor), are both used as the redox mediator. These supercapacitors show superior current density(1 A/cm^(2)) and ultralong cycle-life(8000 cycles) compared with commonly investigated battery-based mediators(NiOOH/Ni(OH)_(2)). Our research proves supercapacitors can be used as redox relay with high current density and stability, which may bring new insights in the design of decoupled water splitting systems.

关键词： Decoupled water splitting Redox mediators Supercapacitors High current density Ultralong cycle-life

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Observation of two-times self-focusing of femtosecond laser beam in ZnO crystal by two-photon luminescence

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Science Bulletin 2018年第21期63卷 1392-1396页

作者： xiaorui wang Honggang Ye Zhicheng Su Dapeng Yu Shijie Xu Department of Physics and Shenzhen Institute of Research and Innovation (HKU-SIRI)The University of Hong KongHong KongChina Department of Physics Southern University of Science and TechnologyShenzhen 518055China Department of Applied Physics Xi'an Jiaotong UniversityXi'an 710049China

By ‘‘seeing" the green two-photon luminescence, two separate focusing points are observed on the propagation axis of a converging femtosecond laser beam in a ZnO single crystal rod. It is found that the selffocusing effect makes a significant contribution to the formation of the first focusing point, while the second focusing point is caused by self-refocusing. The position of the first focusing point is in good agreement with the value predicted by a model developed by Chin and his co-workers. These experimental findings could be the unprecedented evidence for the self-focusing and refocusing effect of the femtosecond laser filament propagation in nonlinear media.

关键词： Self-focusing Self-refocusing ZnO rod Two-photon luminescence

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An integrated microfluidic device for the simultaneous detection of multiple antibiotics

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Chinese Chemical Letters 2023年第8期34卷 287-290页

作者： xiaorui wang Gaowa Xing Nan Li Yaoshuang Xie Ling Lin Department of Bioengineering Beijing Technology and Business UniversityBeijing 100048China College of Chemistry and Chemical Engineering Lanzhou UniversityLanzhou 730000China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 100029China

Residual antibiotics in food pose a serious long-term threat to human ***,an on-site visualization method for antibiotic detection is ***,the requirements of traditional antibiotic testing methods in terms of operator proficiency and equipment cost hinder the rapid point-of-caretesting detection of suspected ***,we reported an integrated microfluidic device combining a microfluidic chip containing cruciform valves with immunochromatographic strips for the rapid detection of multiple antibiotics in *** rapid qualitative and quantitative analysis of four types of antibiotics(sulfonamides,β-lactams,streptomycin,and tetracyclines)was performed using mobile phone photography and mobile phone application *** detection time was maintained at 10 *** limits of detection(LODs)for the four antibiotics were 0.15,0.12,0.25,and 0.29 ng/mL,respectively,and the selectivity for the different antibiotics was observed even in a highly complex *** device successfully integrated separation and real-time detection onto a chip and might provide a promising perspective for the detection of multiple antibiotics in milk.

关键词： Residual antibiotics Microfluidic chip Cruciform valves Point-of-care-testing(POCT) Simultaneous detection

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Modes of occurrence and pre-concentration of rare earth elements in No.17 coal in Liupanshui coalfield,China

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Journal of Rare Earths 2022年第8期40卷 1323-1332页

作者： Bo Yang Chen Cheng Yuanxin Li Wei Cheng Jingkun Zang Xiangping Lai xiaorui wang College of Mining Guizhou UniversityGuiyang 550025China National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas Guiyang 550025China Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources Guiyang 550025China Guizhou Panjiang Clean Coal Co. Ltd.Liupanshui 553000China

Rare earth elements(lanthanide and yttrium,abbreviated as REY) provide important support for national security,energy production,environmental protection and economic *** recent years,many studies have shown that the content of REY in some coal or coal by-products is close to or even higher than that in traditional REY ore,which makes coal a potential source of *** study took the No.17 coal of Panzhou mining area in Liupanshui coal field as the research object,and the content and occurrence modes of REY in raw coal and 7 density fraction samples were *** results show that the content of REY in the raw coal reaches 220.67 μg/g,which is significantly higher than the average REY content in the world coal and Chinese coal as reported in the *** separation has a certain pre-enrichment effect on REY and the fraction sample> 1.8 g/cm~3 has the highest REY of 426.27 μg/g(equal to rare earth oxide 0.1%).Study on correlation between REY and ash yields reveals that the organic affinity of the light rare earth is higher than that of the medium rare earth and the heavy rare *** shown by X-ray diffraction(XRD) and X-ray flouresence spectroscopy(XRF),the major minerals in coal are kaolinite,quartz and calcite,and the content of REY in coal is significantly related to Al,Si and kaolinite,which implies that REY occur mainly in *** ablation inductively coupled plasma mass spectroscopy(LA-ICP-MS) was adopted to determine chemical composition of micro-zone in kaolinite in coal and the results show that there is no obvious correlation between REY and the contents of Al and *** indicates that the REY occur probably in the form of *** research results provide a scientific reference for the potential extraction of the associated REY in the coal.

关键词： Coal Rare earth elements Occurrence mode Kaolinite Pre-concentration

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Information Transfer Model of Virtual Machine Based on Storage Covert Channel

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Wuhan University Journal of Natural Sciences 2013年第5期18卷 377-384页

作者： wang xiaorui wang Qingxian GUO Yudong LU Jianping Fourth Department PLA Information Engineering University State Key Laboratory of Mathematical Engineering and Advanced Computing Department of Communication Command Chongqing Communication Institute

Aiming at the problem that virtual machine information cannot be extracted incompletely, we extend the typical information extraction model of virtual machine and propose a perception mechanism in virtualization system based on storage covert channel to overcome the affection of the semantic gap. Taking advantage of undetectability of the covert channel, a secure channel is established between Guest and virtual machine monitor to pass data directly. The Guest machine can pass the control information of malicious process to virtual machine monitor by using the VMCALL instruction and shared memory. By parsing critical information in process control structure, virtual machine monitor can terminate the malicious processes. The test results show that the proposed mechanism can clear the user-level malicious programs in the virtual machine effectively and covertly. Meanwhile, its performance overhead is about the same as that of other mainstream monitoring mode.

关键词： virtualization safety protection information extraction of virtual machine covert channel process control structure

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Bearing Fault Diagnosis with DDCNN Based on Intelligent Feature Fusion Strategy in Strong Noise

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Computers, Materials & Continua 2023年第12期77卷 3423-3442页

作者： Chaoqian He Runfang Hao Kun Yang Zhongyun Yuan Shengbo Sang xiaorui wang College of Electronic Information and Optical Engineering Taiyuan University of TechnologyTaiyuan030024China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan030024China

Intelligent fault diagnosis in modern mechanical equipment maintenance is increasingly adopting deep learning ***,conventional bearing fault diagnosis models often suffer from low accuracy and unstable performance in noisy environments due to their reliance on a single input ***,this paper proposes a dual-channel convolutional neural network(DDCNN)model that leverages dual data *** DDCNN model introduces two key ***,one of the channels substitutes its convolution with a larger kernel,simplifying the structure while addressing the lack of global information and shallow ***,the feature layer combines data from different sensors based on their primary and secondary importance,extracting details through small kernel convolution for primary data and obtaining global information through large kernel convolution for secondary *** experiments conducted on two-bearing fault datasets demonstrate the superiority of the two-channel convolution model,exhibiting high accuracy and robustness even in strong noise ***,it achieved an impressive 98.84%accuracy at a Signal to Noise Ratio(SNR)of−4 dB,outperforming other advanced convolutional models.

关键词： Fault diagnosis dual-data dual-channel feature fusion noise-resistance

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Structural characterization and mechanisms of macrophage immunomodulatory activity of a novel polysaccharide with a galactose backbone from the processed Polygonati Rhizoma

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Journal of Pharmaceutical Analysis 2024年第7期14卷 1076-1090页

作者： Hongna Su Lili He Xina Yu Yue wang Li Yang xiaorui wang Xiaojun Yao Pei Luo Zhifeng Zhang Faculty of Chinese Medicine State Key Laboratory of Quality Research in Chinese MedicineMacao University of Science and TechnologyMacao999078China Tibetan Plateau Ethnic Medicinal Resources Protection and Utilization Key Laboratory of National Ethnic Affairs Commission of the People's Republic of China Southwest Minzu UniversityChengdu610041China Centre for Artificial Intelligence Driven Drug Discovery Faculty of Applied SciencesMacao Polytechnic UniversityMacao999078China

A purified polysaccharide with a galactose backbone(SPR-1,Mw 3,622 Da)was isolated from processed Polygonati Rhizoma with black beans(PRWB)and characterized its chemical *** backbone of SPR-1 consisted of[(4)-b-D-Galp-(1]9/4,6)-b-D-Galp-(1/4)-a-D-GalpA-(1/4)-a-D-GalpA-(1/4)-aD-Glcp-(1/4,6)-a-D-Glcp-(1/4)-a/b-D-Glcp,with a branch chain of R1:b-D-Galp-(1/3)-b-D-Galp-(1/connected to the/4,6)-b-D-Galp-(1/via O-6,and a branch chain of R2:a-D-Glcp-(1/6)-a-D-Glcp-(1/connected to the/4,6)-a-D-Glcp-(1/via *** assays showed that the SPR-1 significantly activated macrophages,and increased secretion of NO and cytokines(i.e.,IL-1b and TNF-a),as well as promoted the phagocytic activities of ***,isothermal titration calorimetry(ITC)analysis and molecular docking results indicated high-affinity binding between SPR-1 and MD2 with the equilibrium dissociation constant(KD)of 18.8 *** was suggested that SPR-1 activated the immune response through Toll-like receptor 4(TLR4)signaling and downstream *** research demonstrated that the SPR-1 has a promising candidate from PRWB for the TLR4 agonist to induce immune response,and also provided an easily accessible way that can be used for PR deep processing。

关键词： Polygonati Rhizoma Polysaccharide Structural properties Immunoregulatory

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