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Innovative pilot-scale process for sustainable rare earth oxide production from coal byproducts:A comprehensive environmental impact assessment

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Journal of Rare Earths 2025年第2期43卷 397-404,I0006页

作者： Mohsen Rabbani Joshua Werner Ario Fahimi Ehsan Vahidi department of Mining and Metallurgical Engineering Mackay School of Earth Sciences and EngineeringUniversity of NevadaRenoNV USA department of Mining Engineering University of KentuckyLexingtonKY USA

This study developed a pilot-scale process feeding with two different materials resulting from a column leaching process and acid mine drainage(AMD)streams to recover rare earth elements(REEs).A life cycle assessment(LCA)study was done to evaluate the environmental impacts of rare earth production from deleterious material in the form of highly contaminated leachate(HCL)and low-contaminated leachate(LCL).The results indicate that the main contributors to environmental categories that produce RE-hydroxide stages are NaOH and ***,oxalic acid,Na_(2)CO_(3),and hydrochloric acid significantly contribute to the production stage of individual rare earth oxides(REOs),including solvent extraction(SX)and precipitation *** HCL route has higher environmental impacts than LCL due to higher chemical/energy and H_(2)SO_(4)usage,so 468 and 292 kg of carbon dioxide are generated to produce1 t of individual REOs from HCL and LCL routes,***,the carbon dioxide emitted from the process,including the RE-hydroxide production,SX,and REOs production,is less than 10 t CO_(2).A sensitivity analysis was also performed to assess the changeability of the environmental footprints of the main inputs in the SX process,as the main stage has a higher contribution to the whole *** LCA study is the first step toward understanding the environmental influence of new processing methods to produce REEs from coal by-products through a developed pilot-scale process.

关键词： Environmental impacts Rare earth elements Precipitation Rare earth oxide Life cycle assessment Coal by-products

Sharp Isolated Toughness Bound for Fractional(k,m)-Deleted Graphs

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Acta Mathematicae Applicatae Sinica 2025年第1期41卷 252-269页

作者： Wei GAO Wei-fan WANG Yao-jun CHEN School of Mathematics Hohai UniversityNanjing 210098China department of Mathematics Zhejiang Normal UniversityJinhua 321004China department of Mathematics Nanjing UniversityNanjing 210093China

A graph G is a fractional(k,m)-deleted graph if removing any m edges from G,the resulting subgraph still admits a fractional *** k≥2 and m≥1 be ***[2m/k]^(*)=[2m/k]if 2m/k is not an integer,and[2m/k]^(*)=[2m/k]-1 if 2m/k is an *** this paper,we prove that G is a fractional(k,m)-deleted graph if δ(G)≥k+m and isolated toughness meets I(G)>{3-1/m,if k=2 and m≥3,k+[2m/k]^(*)m+1-[2m/k]^(*);***,we show that the isolated toughness bound is tight.

关键词： graph isolated toughness fractional k-factor fractional(k,m)-deleted graph

P2Y1 receptor in Alzheimer’s disease

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Neural Regeneration Research 2025年第2期20卷 440-453页

作者： Shan Luo Yifei Wang Tatsuhiro Hisatsune department of Integrated Biosciences The University of TokyoKashiwaJapan

Alzheimer’s disease is the most frequent form of dementia characterized by the deposition of amyloid-beta plaques and neurofibrillary tangles consisting of hyperphosphorylated *** amyloid-beta plaques has been a primary direction for developing Alzheimer’s disease treatments in the last ***,existing drugs targeting amyloid-beta plaques have not fully yielded the expected results in the clinic,necessitating the exploration of alternative therapeutic *** evidence unravels that astrocyte morphology and function alter in the brain of Alzheimer’s disease patients,with dysregulated astrocytic purinergic receptors,particularly the P2Y1 receptor,all of which constitute the pathophysiology of Alzheimer’s *** receptors are not only crucial for maintaining normal astrocyte function but are also highly implicated in neuroinflammation in Alzheimer’s *** review delves into recent insights into the association between P2Y1 receptor and Alzheimer’s disease to underscore the potential neuroprotective role of P2Y1 receptor in Alzheimer’s disease by mitigating neuroinflammation,thus offering promising avenues for developing drugs for Alzheimer’s disease and potentially contributing to the development of more effective treatments.

关键词： astrocytes neuroinflammation P2Y1 receptor purinergic receptor

Application of feedforward and recurrent neural networks for model-based control systems

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Control Theory and Technology 2025年第1期23卷 91-104页

作者： Marek Krok Wojciech P.Hunek Szymon Mielczarek Filip Buchwald Adam Kolender department of Control Science and Engineering Opole University of TechnologyOpolePoland

In this paper,a new study concerning the usage of artificial neural networks in the control application is *** is shown,that the data gathered during proper operation of a given control plant can be used in the learning process to fully embrace the control ***,the instances driven by neural networks have the ability to outperform the original analytically driven *** different control schemes,namely perfect,linear-quadratic,and generalized predictive controllers were used in the theoretical *** addition,the nonlinear recurrent neural network-based generalized predictive controller with the radial basis function-originated predictor was obtained to exemplify the main results of the paper regarding the real-world application.

关键词： Predictive control Linear-quadratic control Inverse problems Feedforward network Recurrent neural network Optimization

Effects of spatial heterogeneity on pseudo-static stability of coal mine overburden dump slope,using random limit equilibrium and random finite element methods:A comparative study

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 83-99页

作者： Madhumita Mohanty Rajib Sarkar Sarat Kumar Das department of Civil Engineering Indian Institute of Technology(ISM)DhanbadDhanbad 826004India

Sudden and unforeseen seismic failures of coal mine overburden(OB)dump slopes interrupt mining operations,cause loss of lives and delay the production of *** of the spatial heterogeneity of OB dump materials is imperative for an adequate evaluation of the seismic stability of OB dump *** this study,pseudo-static seismic stability analyses are carried out for an OB dump slope by considering the material parameters obtained from an insitu field *** heterogeneity is simulated through use of the random finite element method(RFEM)and the random limit equilibrium method(RLEM)and a comparative study is *** of horizontal and vertical spatial correlation lengths were considered for simulating isotropic and anisotropic random fields within the OB dump *** performances of the slope have been reported through the probability of failure and reliability *** was observed that the RLEM approach overestimates failure probability(P_(f))by considering seismic stability with spatial *** P_(f)was observed to increase with an increase in the coefficient of variation of friction angle of the dump ***,it was inferred that the RLEM approach may not be adequately applicable for assessing the seismic stability of an OB dump slope for a horizontal seismic coefficient that is more than or equal to 0.1.

关键词： coal mine overburden dump slope random limit equilibrium method random finite element method seismic slope stability spatial heterogeneity

Intestinal microbiota and type 2 diabetes:from mechanism insights to therapeutic perspective

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World Journal of Gastroenterology 2014年第47期20卷 17737-17745页

作者： Jun-Ling Han Hui-Ling Lin department of Endocrinology and metabolism the 187~(th) Hospital of PLA

The incidence of type 2 diabetes(T2DM)is rapidly increasing ***,the pathogenesis of T2DM has not yet been well *** evidence suggests that the intestinal microbiota composition is associated with obesity and *** this review,we provide an overview about the mechanisms underlying the role of intestinal microbiota in the pathogenesis of *** is clear evidence that the intestinal microbiota influences the host through its effect on body weight,bile acid metabolism,proinflammatory activity and insulin resistance,and modulation of gut *** gut microbiota with the use of probiotics,prebiotics,antibiotics,and fecal microbiota transplantation may have benefits for improvement in glucose metabolism and insulin resistance in the *** studies are required to increase our understanding of the complex interplay between intestinal microbiota and the host with *** studies may be able to boost the development of new effective therapeutic approaches for T2DM.

关键词： Intestinal microbiota Type 2 diabetes Body weight Bile-acid metabolism Insulin resistance Intestinal microbiota modulation

Few-shot learning for screening 2D Ga_(2)CoS_(4-x) supported single-atom catalysts for hydrogen production

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Journal of Energy Chemistry 2025年第1期100卷 665-673页

作者： Nabil Khossossi Poulumi Dey department of Mechanical Engineering(ME) Delft University of Technology2628 CD DelftThe Netherlands

Hydrogen generation and related energy applications heavily rely on the hydrogen evolution reaction(HER),which faces challenges of slow kinetics and high *** electrocatalysts,particularly single-atom catalysts (SACs) on two-dimensional (2D) materials,are *** study presents a few-shot machine learning (ML) assisted high-throughput screening of 2D septuple-atomic-layer Ga_(2)CoS_(4-x)supported SACs to predict HER catalytic ***,density functional theory (DFT)calculations showed that 2D Ga_(2)CoS4is inactive for ***,defective Ga_(2)CoS_(4-x)(x=0–0.25)monolayers exhibit excellent HER activity due to surface sulfur vacancies (SVs),with predicted overpotentials (0–60 mV) comparable to or lower than commercial Pt/C,which typically exhibits an overpotential of around 50 m V in the acidic electrolyte,when the concentration of surface SV is lower than 8.3%.SVs generate spin-polarized states near the Fermi level,making them effective HER *** demonstrate ML-accelerated HER overpotential predictions for all transition metal SACs on 2D Ga_(2)CoS_(4-x).Using DFT data from 18 SACs,an ML model with high prediction accuracy and reduced computation time was *** intrinsic descriptor linking SAC atomic properties to HER overpotential was *** study thus provides a framework for screening SACs on 2D materials,enhancing catalyst design.

关键词： Hydrogen production Electrocatalyst 2D material Density functional theory Machine learning Surface sulfur vacancy

Bi-predual Spaces of Generalized Campanato Spaces with Variable Growth Condition

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Acta Mathematica Sinica,English Series 2025年第1期41卷 273-303页

作者： Satoshi Yamaguchi Eiichi Nakai Katsunori Shimomura department of Mathematics Ibaraki UniversityMitoIbaraki 310–8512Japan

In this paper we extend the duality(C_(comp)^(∞)(R^(d))^(BMO(R^d))))^(∗)=H^(1)(R^(d))to generalized Campanato spaces with variable growth condition Lp,φ(R^(d))instead of BMO(R^(d)).We also extend the characterization of C_(comp)^(∞)(R^(d))BMO(Rd)by Uchiyama(1978)to C_(comp)^(∞)(R^(d))L _(p,φ)(R^(d)).Moreover,using this characterization,we prove the boundedness of singular and fractional integral operators on C_(comp)^(∞)(R_(d))L_(p,φ)(R^(d)).The function space L_(p,φ)(R^(d))treated in this paper covers the case that it is coincide with Lip_(α) on one area,with BMO on another area and with the Morrey space on the other area,for example.

关键词： Campanato space variable growth condition predual singular integral fractional integral

Exploring catalyst developments in heterogeneous CO2 hydrogenation to methanol and ethanol:A journey through reaction pathways

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Journal of Energy Chemistry 2025年第2期101卷 345-384页

作者： Rasoul Salami Yimin Zeng Xue Han Sohrab Rohani Ying Zheng department of Chemical and Biochemical Engineering Western University Canmet MATERIALS Natural Resources Canada

The pursuit of alternative fuel generation technologies has gained momentum due to the diminishing reserves of fossil fuels and global warming from increased *** the proposed methods,the hydrogenation of CO2to produce marketable carbon-based products like methanol and ethanol is a practical approach that offers great potential to reduce *** significant volumes of methanol are currently produced from CO2,developing highly efficient and stable catalysts is crucial for further enhancing conversion and selectivity,thereby reducing process *** in-depth examination of the differences and similarities in the reaction pathways for methanol and ethanol production highlights the key factors that drive C-C *** these factors guides us toward developing more effective catalysts for ethanol *** this paper,we explore how different catalysts,through the production of various intermediates,can initiate the synthesis of methanol or *** catalytic mechanisms proposed by spectroscopic techniques and theoretical calculations,including operando X-ray methods,FTIR analysis,and DFT calculations,are summarized and *** following discussion explores the structural properties and composition of catalysts that influence C-C coupling and optimize the conversion rate of CO2into ***,the review examines recent catalysts employed for selective methanol and ethanol production,focusing on single-atom catalysts.

关键词： CO 2 hydrogenation Methanol Ethanol Catalytic mechanism Operando techniques Single atom catalyst Tandem catalyst