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Development of barium@alginate adsorbents for sulfate removal in lithium refining

Frontiers of Chemical Science and engineering 2021年第1期15卷 198-207页

作者： lisa Xu Kaifei Chen George Q.Chen Sandra e.Kentish Gang(Kevin)Li Department of Chemical engineering The University of MelbourneParkvilleVIC 3010Australia

The demand for lithium has been steadily growing in recent years due to the boom of electric *** purity lithium is commonly used in the manufacture of battery grade lithium *** residuals originating from acid leaching of lithium ores must be limited to below 20 mg·L^(−1) during *** are methods to remove sulfate such as membrane processing and chemical precipitation using barium ***,membrane separation is unable to achieve the required purity while chemical precipitation often causes secondary contamination with barium and requires extra filtration processes that lead to increased processing *** this study,we developed a polymeric matrix entrapped with barium ions as a novel adsorbent to selectively adsorb sulfate in aqueous *** adsorbent was prepared by dropwise injection method where alginate droplets were crosslinked with barium to form hydrogel *** a typical scenario,the microcapsules had a diameter of 3 mm and contained 5 wt-%*** microcapsules could successfully reduce sulfate concentration in a solution from 100 to 16 mg·L^(−1),exceeding the removal ***,the microcapsules were mechanically unstable in the presence of an excess amount of ***,calcium ions were added as a secondary crosslinking agent to improve the integrity of the *** two-step Ca/Ba@alginate microcapsules showed an exceptional adsorption performance,reducing the sulfate concentration to as low as 0.02 mg·L^(−1).Since the sulfate selective microcapsules can be easily removed from the aqueous system and do not result in secondary barium contamination,these Ca/Ba@alginate adsorbents will find applications in ultra-refining of lithium in industry.

关键词： barium@alginate microcapsules dropwise injection sulfate removal lithium

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Merging bound states in the continuum in an open acoustic resonator

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem S.Pilipchuk Sibo Huang Chen Shen Almas F.Sadreev Yong Li Andrey e.Miroshnichenko School of Physics and electronic Sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of Physics Department of Mechanical engineering Rowan University School of engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

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MICROSTRUCTURe CHARACTeRIZATION OF LiCoO_2 COATINGS FOR MOLTeN CARBONATe FUeL CeLLS COMPONeNTS

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Chinese Journal of Mechanical engineering 2002年第2期15卷 182-185页

作者： Klein lisa College of Materials Science and engineering Fuzhou University Fuzhou 350002China ***

The sol-gel process, sing aqueous solutions, is used for dip coating ontosubstrates of 316L stainless steel. A suitable coating of Li CoO_2 is achieved by varying thethickness and heat treating at 650 deg C for 3 h. Thermal analysis, X-ray diffraction analysis andSeM are carried out to characterize the microstructure of the coatings. The results show that thecoating transforms from an amorphous gel to crystalline phases above 350 deg C, and show a porousstructure. The phase transition mechanism is discussed.

关键词： Molten carbonate fuel cells Sol-gel LiCoO_2 coating Crystalline phasetransition

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Some Remarks on the Boundedness and Convergence Properties of Smooth Sliding Mode Controllers

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International Journal of Automation and computing 2009年第2期6卷 154-158页

作者： wallace Moreira Bessa Federal University of Rio Grande do Norte Department of Mechanical Engineering

Conventional sliding mode controllers are based on the assumption of switching control, but a well-known drawback of such controllers is the chattering phenomenon. To overcome the undesirable chattering effects, the discontinuity in the control law can be smoothed out in a thin boundary layer neighboring the switching surface. In this paper, rigorous proofs of the boundedness and convergence properties of smooth sliding mode controllers are presented. This result corrects flawed conclusions previously reached in the literature. An illustrative example is also presented in order to confirm the convergence of the tracking error vector to the defined bounded region.

关键词： Convergence analysis Lyapunov methods nonlinear control sliding mode.

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Parrondo's paradox for chaos control and anticontrol of fractional-order systems

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Chinese Physics B 2016年第1期25卷 507-513页

作者： Marius-F Danca wallace K S Tang Department of Mathematics and Computer Science Avram Iancu University Romanian Institute for Science and Technology Department of electronic engineering City University of Hong Kong

We present the generalized forms of Parrondo＇s paradox existing in fractional-order nonlinear systems. The gener- alization is implemented by applying a parameter switching （PS） algorithm to the corresponding initial value problems associated with the fractional-order nonlinear systems. The PS algorithm switches a system parameter within a specific set of N 〉 2 values when solving the system with some numerical integration method. It is proven that any attractor of the concerned system can be approximated numerically. By replacing the words ＂winning＂ and ＂loosing＂ in the classical Parrondo＇s paradox with ＂order＂ and ＂chaos＂, respectively, the PS algorithm leads to the generalized Parrondo＇s paradox： chaos1 ＋ chaos2 ＋..- ＋ chaosN = order and order1 ＋ order2 ＋.-. ＋ orderN = chaos. Finally, the concept is well demon- strated with the results based on the fractional-order Chen system.

关键词： Parrondo's paradox chaos control parameter switching algorithm fractional-order Chen system

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Assessing bioactivity of environmental water samples filtered using nanomembrane technology and mammalian cell lines

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eco-environment & Health 2024年第3期3卷 347-354页

作者： Sarah e.Morgan lisa A.DeLouise Department of environmental Medicine University of Rochester Medical CenterRochesterNY 14642USA Department of Biomedical engineering University of RochesterRochesterNY 14627USA Department of Dermatology University of Rochester Medical CenterRochesterNY 14642USA Lake Ontario Center for Microplastics and Human Health in a Changing environment University of Rochester Medical CenterRochesterNY 14642USA

This project reports on the use of a novel nanomembrane filtering technology to isolate and analyze the bioactivity of microplastic(MP)-containing debris from Lake Ontario water *** MPs are a complex mixture of polymers and sorbed chemicals that are persistent and can exhibit a wide range of toxic *** human exposure to MPs is unavoidable,it is necessary to characterize their bioactivity to assess potential health *** work seeks to quantify MP presence in the nearshore waters of Lake Ontario and begin to characterize the bioactivity of the filtrate containing *** utilized silicon nitride(SiN)nanomembrane technology to isolate debris sized between 8 and 20μm from lake water samples collected at various times and *** were identified with Nile red ***-based assays were conducted directly on the filtered debris to test for cell viability,aryl hydrocarbon receptor(AhR)activity,and interleukin 6(IL-6)levels as a measure of proinflammatory *** samples contained *** of the isolated debris impacted cell ***,AhR activity and IL-6 levels varied over ***,no associations were observed between the amount of plastic and *** differences in activity are likely due to variations in the physiochemical properties of debris between *** results highlight the need for increased sampling to fully characterize the bioactivity of MPs in human cells and to elucidate the role that sample physiochemical and spatiotemporal properties play in this activity.

关键词： Microplastics SiN nanomembranes Lake Ontario Aryl hydrocarbon receptor(AhR)activity IL-6 levels Bioactivity

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Scale up of reactors for carbon dioxide reduction

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Frontiers of Chemical Science and engineering 2023年第1期17卷 116-122页

作者： Andrew Nattestad Klaudia Wagner Gordon G.wallace Intelligent Polymer Research Institute and ARC Centre of excellence for electromaterials Science University of WollongongWollongong NSW 2522Australia School of Chemistry Monash UniversityClayton VIC 3800Australia

In recent times there has been a great deal of interest in the conversion of carbon dioxide into more useful chemical *** the other hand,the translation of these developments in electrochemical reduction of carbon dioxide from the laboratory bench to practical scale remains an underexplored *** we examine some of the major challenges,demonstrating some promising strategies towards such scale-up,including increased electrode area and stacking of electrode pairs in different *** observed that increasing the electrode area from 1 to 10 cm^(2) led to only a 4%drop in current density,with similarly small penalties realised when stacking sub-cells together.

关键词： CO_(2)reduction electrochemical cell electrosynthesis upscaling

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The Neglected Role of Risk Mitigation Perception in the Risk Governance of Underground Technologies——The example of Induced Seismicity

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International Journal of Disaster Risk Science 2020年第5期11卷 630-639页

作者： lisa Haemmerli Michael Stauffacher D-USYS Transdisciplinarity Lab Department of Environmental Systems Science(D-USYS)ETH Zurich(Swiss Federal Institute of Technology/Eidgenossische Technische Hochschule)8092 ZurichSwitzerland

Subsurface technologies,such as geothermal energy and carbon capture and storage,are options to help limit global *** tech no logies involve the risk of induced *** successful implementation of these technologies depends on the public perception of these *** governance frameworks propose assessing the level of public concern and designing adapted risk mitigation *** propose that concerns should not only be investigated with respect to the perceived risks but also with respect to the potential mitigation *** explore this by analyzing the perception of risk mitigation measures for different subsurface *** an online survey(N=808)in Switzerland we analyzed four technologies(in-between subject design)and four mitigation measures(within subject design).We found that risk mitigation measures are perceived differently,within and across ***,public concerns about risk mitigation really *** suggest that future research should focus on how risk mitigation measures can be applied and communicated to realize the full potential of risk governance frameworks.

关键词： Carbon capture and storage enhanced geothermal systems Induced seismicity Risk mitigation perception Shale gas Switzerland

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enhancing perianal disease management with integrated physical and psychological approaches

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World Journal of Clinical Cases 2025年第2期13卷 59-63页

作者： Uchenna e Okpete Haewon Byeon Department of Digital Anti-aging Healthcare(BK21) Inje UniversityGimhae 50834South Korea

This article provides a comprehensive analysis of the study by Hou et al,focusing on the complex interplay between psychological and physical factors in the postoperative recovery(POR)of patients with perianal *** study sheds light on how illness perception,anxiety,and depression significantly influence recovery *** et al developed a predictive model that demonstrated high accuracy in identifying patients at risk of poor *** article explores the critical role of pre-operative psychological assessment,highlighting the need for mental health support and personalized recovery plans in enhancing POR quality.A multidisciplinary approach,integrating mental health professionals with surgeons,anesthesiologists,and other specialists,is emphasized to ensure comprehensive care for *** study’s findings serve as a call to integrate psychological care into surgical practice to optimize outcomes for patients with perianal diseases.

关键词： Perianal disease Post-operative recovery Anxiety Depression Pain management emotional well-being Multidisciplinary approach

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Lowland tapir (Tapirus terrestris) distribution, activity patterns and relative abundance in the Greater Madidi-Tambopata Landscape

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Integrative Zoology 2012年第4期7卷 407-419页

作者： Robert wallace Guido AYALA Maria VISCARRA Wildlife Conservation Society(WCS) Greater Madidi-Tambopata LandscapeLa PazBolivia WCS New YorkUSA

Lowland tapir distribution is described in northwestern Bolivia and southeastern Peru within the Greater Madidi-Tambopata Landscape,a priority Tapir Conservation Unit,using 1255 distribution points derived from cam-era trapping efforts,field research and interviews with park guards from 5 national protected areas and hunt-ers from 19 local communities.A total of 392 independent camera trapping events from 14 camera trap surveys at 11 sites demonstrated the nocturnal and crepuscular activity patterns(86%)of the lowland tapir and provide 3 indices of relative abundance for spatial and temporal *** rates for lowland tapirs were not significantly different between camera trapping stations placed on river beaches versus those placed in the *** tapir capture rates were significantly higher in the national protected areas of the region versus in-digenous territories and unprotected portions of the *** rates through time suggested that low-land tapir populations are recovering within the Tuichi Valley,an area currently dedicated towards ecotourism activities,following the creation(1995)and subsequent implementation(1997)of the Madidi National Park in *** on our distributional data and published conservative estimates of population density,we calcu-lated that this transboundary landscape holds an overall lowland tapir population of between 14540 and 36351 individuals,of which at least 24.3%are under protection from national and municipal *** such,the Great-er Madidi-Tambopata Landscape should be considered a lowland tapir population stronghold and priority con-servation efforts are discussed in order to maintain this population.

关键词： Amazon Bolivia camera trapping Peru population stronghold

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