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Solid-liquid extraction for yttrium recovery using porous polymeric resin(XAD-7) functionalized with D_(2)EHpA

Journal of rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： p.A.Martínez-Montoya r.g.Sanchez-Alvarado D.Y.Medina-Velazquez M.L.Carrera-Jota p.garnica-Chávez A.de J.Morales-ramirez Higher School of Chemical Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metropolitan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for research and Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is proposed by applying a solid-liquid extraction process using di-2-ethyl hexylphosphoric acid(D2EHpA) as extracting *** extracting agents were supported on a macro porous polymeric resin XAD-7(solid phase).Yttrium ions extraction and discharge tests were performed,firstly from a synthetic aqueous solution of 100 mg/L Y(liquid phase) at 25℃ with *** effects of pH of aqueous solutions bearing yttrium,volume fraction of extracting agents and the solid/liquid(S/L)ratio on the yttrium recovery were *** most favorable conditions for yttrium ions extraction are;20 vol% D_(2)EHpA functionalized resin,pH=1.5 and an S/L ratio of 10 mg/mL The discharge of yttrium ions was done under the same conditions of extraction stage,using a 2 mol/L [H_(2)SO_(4)] as stripping *** to 80% yttrium is extracted,while 75% yttrium is recovered in the striping *** all experiments,the reaction equilibrium is reached after 20 min,and the kinetics for the extraction stage was determined as a second-order ***,experiments were carried out to discharge the yttriumloaded resins,and it has been determined that the best pH value to strip the Y ions is *** tests of extraction and discharge for yttrium ions show that the functionalized resin can work at least five cycles without decreasing its ***,the proposed process was tested in a real solution with Y ions fro m a waste fluorescent la mp powder leached in H_(2)SO_(4),demonstrating the ability to effectively recover yttrium,separating it from various metals from the studied residue.

关键词： Yttrium recovery rare earth solid-liquid extraction XAD-7 resin Fluorescent lamps recycling Solid-liquid kinetics extraction

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A novel diurnal and seasonal variation analysis of BTEX in Bengaluru urban area

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research in Cold and Arid regions 2024年第1期16卷 14-19页

作者： H.N.Sowmya M.Dinamani g.p.Shivashankara H.K.ramaraju B.S.Surendra Vijaya V.Shanbhag r.prajwal Department of Civil Engineering Dayananda Sagar College of EngineeringBangalore 560078India Department of Chemistry Dayananda Sagar College of EngineeringBangalore 560078India Department of physics GFGCVijayanagarBengaluru 560040India

In the urban atmosphere of Bengaluru, various volatile organic compounds(VOCs), particularly Benzene,Toluene, Ethylbenzene, and Xylene(BTEX), have shown an increasing trend in concentration. The present research was conducted during summer and monsoon seasons, focusing on Kadubeesanahalli, a high-traffic area within the Bengaluru Metropolitan City. Hourly sample data was collected using a BTEX analyzer(Model gC955-600) and subsequently transformed into daily, monthly, and seasonal values. The study revealed distinct patterns in benzene concentrations. Benzene levels were lowest during the early morning hours, specifically from 1:00 *** 7:00 a.m.. Concentrations then increased from 7:00 a.m. to 9:00 a.m. and again from 4:00 p.m. to 11:00 p.m.,corresponding to the morning and evening peak traffic hours. However, between 10:00 a.m. and 4:00 p.m., the concentration decreased due to reduced traffic levels. These diurnal variations in benzene concentration are influenced by meteorological parameters. Comparing the two seasons, higher concentrations of Benzene, EthylBenzene, and mp-xylene were observed during the summer season. This increase is attributed to the elevated temperatures during summer, which promote the vaporization of BTEX compounds. Conversely, lower BTEX concentrations were recorded during the monsoon season due to the wet deposition process. The observed positive correlation(r > 0.5) among BTEX parameters strongly suggests a common source, most likely originating from vehicular emissions.

关键词： BTEX Summer variation Meteorological parameters Correlation

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Expression of inducible nitric oxide synthase in human gastric cancer

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World Journal of gastroenterology 1999年第5期5卷 430-431页

作者： Jun Y Fei g Ebert mp Malfertheiner p Department of gastroenterology Hepatology and Infectious Diseases University Hospital of Magdeburg Germany

INTrODUCTIONInducible nitric oxide synthase (iNOS) is an enzyme that catalyzes the formation of nitric oxide (NO) from L-arginine. iNOS expression and activity results in the production of high levels of NO[1]. The generation of physiological levels of NO is important for mucosal function and it also exerts a cytoprotective effect on the gastrointestinal mucosa. However, increased iNOS expression has been observed in patients with chronic inflammatory diseases of the gastrointestinal tract, such as ulcerative colitis[2,3], and gastritis[4] and it has been speculated that increased NO may induce DNA damage[5,6] and angiogenesis[7]. Nonetheless, the role of iNOS in human gI neoplasia is largely unkown. previous studies have demonstrated increased iNOS expression in breast cancer[8,9], and increased iNOS activity and protein levels have been demonstrated in colorectal cancer[10] and adenocarcinoma of the esophagus[11]. However, to date, the role of iNOS in gastric carcinogenesis has not been elucidated.

关键词： stomach neoplasms nitric oxide synthase nitric oxide

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“机械灌注+”应用于扩大标准供肝移植--肝尽其用

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Engineering 2024年第1期32卷 29-40页

作者： Zhoucheng Wang Jack martin Jiongjie Yu Kai Wang Kourosh Saeb-parsy Xiao Xu Zhejiang University School of Medicine Hangzhou 310058China Key Laboratory of Integrated Oncology and Intelligent Medicine of Zhejiang province Hangzhou 310006China Department of Surgery Cambridge University Hospitals&NHS Foundation TrustCambridge CB22QQ UK Department of Surgery University of Cambridge&NIHR Cambridge Biomedical Research CentreCambridge CB22QQUK Institute of Organ Transplantation Zhejiang UniversityHangzhou 310003China

Transplantation represents the most effective treatment for end-stage liver diseases but is limited by the shortage of healthy donor *** criteria donor(ECD)liver grafts are increasingly utilized in clinical practice to mitigate this ***,impaired ischemic tolerance of these grafts jeopardizes organ viability during cold *** perfusion(mp)was designed to improve organ preservation and reduce posttransplant ***,it is increasingly evident that mp alone may not preserve ECD grafts *** emphasis has thus been placed on modified mp strategies,including the use of different perfusates,modified perfusion modalities,and different therapeutic ***,we introduce a novel term,"mp plus,"denoting these additional strategies that are designed to restore organ function and potentially enable regeneration of ECD *** this review,we summarize the existing and potential modified mp strategies and discuss their advantages in reconditioning different ECD grafts in clinical settings.

关键词： Liver transplantation Extended criteria donor Machine perfusion plus Organ shortage

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Facilitated prediction of Micropollutant Degradation via UV-AOps in Various Waters by Combining Model Simulation and portable Measurement

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Engineering 2024年第6期37卷 87-95页

作者： Yanyan Huang Mengkai Li Zhe Sun Wentao Li James r.Bolton Zhimin Qiang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Department of Civil and Environmental Engineering University of AlbertaEdmontonAB T6G 1H9Canada State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The degradation of micropollutants in water via ultraviolet(UV)-based advanced oxidation processes(AOps)is strongly dependent on the water *** reactive radicals(rrs)formed in UV-AOps have different reaction selectivities toward water matrices and degradation efficiencies for target ***,process selection and optimization are *** study developed a facilitated prediction method for the photon fluence-based rate constant for micropollutant degradation(K′_(p,mp))in various UV-AOps by combining model simulation with portable *** methods for measuring the scavenging capacities of the principal rrs(rrSCs)involved in UV-AOps(i.e.,HO^(·),SO_(4)^(·-),and Cl^(·))using a mini-fluidic photoreaction system were *** simulation models consisted of photochemical,quantitative structure–activity relationship,and radical concentration steady-state approximation *** rrSCs were determined in eight test waters,and a higher rrSC was found to be associated with a more complex water ***,by taking sulfamethazine,caffeine,and carbamazepine as model micropollutants,the k′_(p,mp) values in various UV-AOps were predicted and further verified experimentally.A lower k′_(p,mp) was found to be associated with a higher rrSC for a stronger rr competition;for example,k′_(p,mp) values of 130.9 and 332.5 m^(2) einstein^(–1),respectively,were obtained for carbamazepine degradation by UV/H_(2)O_(2) in the raw water(rrSC=9.47×10^(4) s^(-1))and sand-filtered effluent(rrSC=2.87×10^(4) s^(-1))of a drinking water treatment *** developed method facilitates process selection and optimization for UV-AOps,which is essential for increasing the efficiency and cost-effectiveness of water treatment.

关键词： UV-AOps Micropollutant degradation reactive radicals Water matrix Model simulation

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physico-Mechanical Characteristics of Earth Bricks Stabilized with Cement and padouk Sawdust residues

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Open Journal of Applied Sciences 2024年第7期14卷 1788-1806页

作者： gabin Alex Nouemssi Bennis Amine martin Ndibi Mbozo’O Bonaventure Djeumako Doko K. Valery guy Edgar Ntamack LA2mp: Laboratory of Mechanics Materials and Photonics National School of Agro-Industrial Sciences ENSAI Ngaoundr Cameroun Department of Mechanical and production Engineering National School of Agro-Industrial Sciences ENSAI Ngaoundr Cameroun LMTM: Laboratory of Mechanics Materials and Thermal National School of Mineral Industry ENIM Rabat Morocco LEMA: Laboratory of Energertic and Applied Mechanics University of Abomey-Calavi Cotonou Benin gMMA: group of Mechanics Materials and Acoustics Department of Physics Faculty of Sciences-EGCIM Ngaoundr Cameroun

The objective of this work is to improve the physical and mechanical properties of stabilized earth blocks (BTC) used in construction in the Ndé department of Cameroon. To achieve this, two stabilizers, cement and sawdust, were used at varying percentages of 0%, 4%, 6%, and 8%. physical characterization tests, including natural water content, specific weight, jar test, protor, and Atterberg limits, were conducted. Additionally, mechanical tests, such as compression and three-point bending, were performed. The results show that as the amount of stabilizer increases, the density of BTC decreases. The samples with 8% sawdust have the highest density, while those without stabilizers have the lowest. porosity decreases as sawdust and cement content increases, with smaller values observed in samples with 8% sawdust or cement. Our tests indicate that blocks stabilized with cement have slightly higher compressive strength than those stabilized with sawdust. However, the water absorption rate increases with higher sawdust content.

关键词： Earth block Cement Sawdust physico-mechanical Characteristics Bangante West Cameroon

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rainfall Sensitivity to Microphysics and planetary Boundary Layer parameterizations in Convection-permitting Simulations over Northwestern South America

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Journal of Meteorological research 2024年第4期38卷 805-825页

作者： K.Santiago HErNANDEZ Sebastian gOMEZ-rIOS Juan J.HENAO Vanessa rOBLEDO Alvaro rAMirEZ-CArDONA Angela M.rENDON geolimna Escuela AmbientalFacultad de IngenieriaUniversidad de AntioquiaMedellin 050010Colombia grupo de Ingenieria y gestion Ambiental(gIgA) Escuela AmbientalFacultad de IngenieriaUniversidad de AntioquiaMedellin 050010Colombia Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512USA

Convection-permitting modeling allows us to understand mechanisms that influence rainfall in specific ***,microphysics parameterization(mp) and planetary boundary layer(pBL) schemes remain an important source of uncertainty,affecting rainfall intensity,occurrence,duration,and ***,we study the sensitivity of rainfall to three mp [Weather research and Forecasting(WrF) Single-Moment 6-class(WSM6),Thompson,and Morrison] and two pBL [the Yonsei University(YSU) and Mellor–Yamada Nakanishi Niino(MYNN)] schemes with a convection-permitting resolution(4 km) over northwestern South America(NWSA).Simulations were performed by using the WrF model and the results were evaluated against soundings,rain gauges,and satellite data,considering the spatio-temporal variability of rainfall over diverse regions prone to deep convection in *** and pBL schemes largely influenced simulated rainfall,with better results for the less computationally expensive WSM6 mp and YSU pBL *** rain gauges and satellite estimates,simulations with Morrison mp overestimated rainfall,especially westward of the Andes,whereas the MYNN pBL underestimated precipitation in the Amazon–Savannas *** found that the uncertainty in the rainfall representation is highly dependent on the region,with a higher influence of mp in the Colombian pacific and pBL in the Amazon–Savannas *** analyzing rainfall-related processes,the selection of both mp and pBL parameterizations exerted a large influence on the simulated lower tropospheric moisture flux and moisture *** schemes significantly influenced the downward shortwave radiation,with MYNN simulating a greater amount of low clouds,which decreased the radiation ***,latent heat fluxes were greater for YSU,favoring moist convection and *** schemes had a marked impact on vertical ***,Morrison mp showed stronger convection and higher precipitation rates,which is assoc

关键词： sensitivity microphysics planetary boundary layer(pBL) Weather research and Forecasting(WrF) processes

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Driving factors behind multiple populations

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Science China(physics,Mechanics & Astronomy) 2024年第5期67卷 172-181页

作者： ruoyun Huang Baitian Tang Chengyuan Li Doug geisler Mario Mateo Ying-Yi Song Holger Baumgardt Julio A.Carballo-Bello Yue Wang Jundan Nie Bruno Dias Joség.Fernández-Trincado School of physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the guangdong-Hong Kong-Macao greater Bay Area Zhuhai 519082China Departamento de Astronomía Universidad de ConcepcionConcepcionChile Instituto de Investigación Multidisciplinario en Ciencia y Tecnología Universidad de La SerenaLa SerenaChile Departamento de Astronomía Facultad de CienciasUniversidad de La SerenaChile Department of Astronomy University of MichiganAnn Arbor 48109USA David A.Dunlap Department of Astronomy&Astrophysics University of TorontoToronto ON M5S 3H4Canada Dunlap Institute for Astronomy&Astrophysics University of TorontoToronto ON M5S 3H4Canada School of Mathematics and physics The University of QueenslandSt.Lucia QLD 4072Australia Instituto de Alta Investigación Universidad de TarapacáAricaChile CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Instituto de Astrofísica Departamento de Ciencias FísicasFacultad de Ciencias ExactasUniversidad Andres BelloSantiagoChile Instituto de Astronomía Universidad Católica del NorteAntofagastaChile

Star clusters were historically considered simple stellar populations,with all stars sharing the same age and initial chemical ***,the presence of chemical anomalies in globular clusters(gCs),called multiple stellar populations(mps),has challenged star formation theories in dense *** studies show that mass,metallicity,and age are likely controlling parameters for the manifestation of *** the limit between clusters with/without mps in physical parameter space is crucial to reveal the driving mechanism behind their *** this study,we look for mp signals in Whiting 1,which is traditionally considered a young *** the Magellan telescope,we obtained low-resolution spectra withinλλ=3850-5500?for eight giants of Whiting *** measured the C and N abundances from the CN and CH spectral indices.C and N abundances have variations comparable with their measurement errors(~0.1 dex),suggesting that mps are absent from Whiting *** these findings with literature studies,we propose a limit in the metallicity *** compactness index parameter space,which relatively clearly separates star clusters with/without mps(gCs/open clusters).This limit is physically *** a larger scale,the galactic environment determines cluster compactness and metallicity,leading to metal-rich,diffuse,old clusters formed ex *** proposed limit also impacts our understanding of the formation of the Sagittarius dwarf galaxy:star clusters formed after the first starburst(age≤8-10 gyr).These clusters are simple stellar populations because the enriched galactic environment is no longer suitable for mp formation.

关键词： stellar galactic galaxy

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镍基单晶超合金中孔洞长大的试验和有限元分析(英文)

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稀有金属材料与工程 2006年第1期35卷 39-42页

作者：王毅岳珠峰 Stein mp 西北工业大学郑州航空工业管理学院河南郑州450015 Institute of Materials Ruhr UniversityBochum 44801德国

在高温状态下,镍基单晶超合金的变形、损伤及断裂分析中,孔洞的长大都起着主要的作用。本研究进行了系列的蠕变、疲劳及热机械疲劳(TMF)试验。对试件的断面进行的 SEM 观察表明,所有的断面都是有许多小断面构成,在断面的中心,至少有一... 详细信息

在高温状态下,镍基单晶超合金的变形、损伤及断裂分析中,孔洞的长大都起着主要的作用。本研究进行了系列的蠕变、疲劳及热机械疲劳(TMF)试验。对试件的断面进行的 SEM 观察表明,所有的断面都是有许多小断面构成,在断面的中心,至少有一个孔洞。孔洞的尺寸与加载的条件相关。使用晶体塑性有限元程序对单胞模型进行分析,模拟孔洞的长大规律。给出了蠕变和弹塑性两种条件下的模拟结果及不同的晶体取向对孔穴长大的影响结果。对孔洞长大的有限元分析有助于对实验结果的理解。

关键词：空洞长大镍基单晶超合金晶体有限元分析蠕变疲劳热机械疲劳(TMF)

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Associations between physical activity levels and ATpase inhibitory factor 1 concentrations in older adults

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Journal of Sport and Health Science 2024年第3期13卷 409-418页

作者： Jérémy raffin Yves rolland Annelise genoux guillaume Combes Mikael Croyal Bertrand perret Sophie guyonnet Bruno Vellas Laurent O.martinez philipe de Souto Barreto For the MApT/DSA group Institut du Vieillissement Gérontopôle de ToulouseCentre Hospitalo-Universitaire de ToulouseToulouse 31000France Centre d'Epidémiologie et de recherche en Santédes populations UnitéMixte de Recherche 1295Institut National de la Santéet de la Recherche MédicaleUniversitéToulouse-III-Paul-SabatierToulouse 31000France LimitAging Team Institut des Maladies Métaboliques et CardiovasculairesUnitéMixte de Recherche 1297Institut National de la Santéet de la Recherche MédicaleUniversitéToulouse III-Paul SabatierToulouse 31432France Service de Biochimie Pôle de biologieHôpital de PurpanCentre Hospitalo-Universitaire de ToulouseToulouse 31300France L'Institut du Thorax Institut National de la Santéet de la Recherche MédicaleCentre National de la Recherche ScientifiqueCentre Hospitalo-Universitaire de NantesNantes UniversitéNantes 44000France BioCore US16Structure Fédérative de Recherche BonamyInstitut National de la Santéet de la Recherche MédicaleCentre National de la Recherche ScientifiqueCentre Hospitalo-Universitaire de NantesNantes UniversitéNantes 44000France plate-forme de spectrométrie de masse Centre de Recherche en Nutrition HumaineOuestNantes 44000France 不详

Background:Adenosine triphosphatase inhibitory factor 1(IF1)is a key protein involved in energy ***1 has been linked to various agerelated diseases,although its relationship with physical activity(pA)remains ***,the apolipoprotein A-I(apoA-I),a pA-modulated lipoprotein,could play a role in this relationship because it shares a binding site with IF1 on the cell-surface ATp *** examined here the associations between chronic pA and plasma IF1 concentrations among older adults,and we investigated whether apoA-I mediated these ***:In the present work,1096 healthy adults(63.8%females)aged 70 years and over who were involved in the Multidomain Alzheimer prevention Trial study were ***1 plasma concentrations(square root of ng/mL)were measured at the 1-year visit of the Multidomain Alzheimer prevention Trial,while pA levels(square root of metabolic equivalent task min/week)were assessed using questionnaires administered each year from baseline to the 3-year *** linear regressions were performed to investigate the associations between the first-year mean pA levels and IF1 *** analyses were conducted to examine whether apoA-I mediated these *** linear regressions were carried out to investigate whether the 1-year visit IF1 concentrations predicted subsequent changes in ***:Multiple linear regressions indicated that first-year mean pA levels were positively associated with IF1 concentrations(B=0.021;SE=0.010;p=0.043).Mediation analyses revealed that about 37.7%of this relationship was mediated by apoA-I(B_(ab)=0.008;SE=0.004;p=0.023).Longitudinal investigations demonstrated that higher concentrations of IF1 at the 1-year visit predicted a faster decline in pA levels over the subsequent 2 years(time×IF1:B=0.148;SE=0.066;p=0.025).Conclusion:This study demonstrates that regular pA is associated with plasma IF1 concentrations,and it suggests that apoA-I partly med

关键词： Aging Apolipoprotein Bioenergetics Exerkine Mitochondria

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