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Investigating the use of an ionic liquid for rare earth mineral flotation

journal of Rare Earths 2021年第7期39卷 866-874,I0004页

作者： R.li C.Marion E.R.l.Espirtu R.Multani Xiaoqi Sun K.E.Waters Department of Mining and Materials Engineering McGill University3610 Rue University.MontrealQuebecH3A 0C5Canada Vale Ontario Operations(Base Metals)18 Rink St.Copper CliffOntario POM 1N0Canada Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences155 Yangqiao Road WestFuzhou 350002China

Common collectors for rare earth mineral(REM) flotation,which include carboxylates and hydroxamates,face problems such as being non-selective and sensitive to impurity ions.A type of ionic liquid(Il),tetraethylammonium mono-(2-ethylhexyl)2-ethylhexyl phosphonate([N_(2222)][EHEHP]),has been investigated previously for rare earth elements(REE) solvent extraction,and was proven to be selective and *** this work,[N_(2222)][EHEHP] was evaluated as a collector in bastnasite(a primary REM source for REE production) flotation for the first *** results were compared with quartz and hematite,two common gangue minerals in REM *** potential measurements and Fouriertransform infrared spectroscopy(FT-IR) were completed to investigate the surface chemical properties involved in the flotation of these minerals using this *** findings were compared with microflotation ***-IR and zeta potential measurements suggest adsorption of the collector’s phosphonate group onto bastnäsite and hematite,likely through chemisorption;whereas for quartz,the minimum micro flotation recovery is likely due to no adsorption of Il on its *** flotation re sults show higher collectability of [N_(2222)] [EHEHP] for hematite than bastnasite,the latter only shows appreciable recovery at pH 5 with elevated dosage of Il(500 g/t).To achieve better separation,a two-stage flotation scheme was designed and evaluated by bench scale flotation on a synthetic mineral *** concentrates and tails were analyzed by magnetic separation,and it is found that bastnasite recovery over 90% with maximum upgrade ratio 1.7 can be achieved with elevated collector dosage.

关键词： Ionic liquid Rare earth Bastnasite Flotation FT-IR Zeta potential

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Eye and Vision 2019年第1期6卷 322-330页

作者： Ke Cao Srujana Sahebjada Andrea j.Richardson Paul N.Baird Centre for Eye Research Australia Royal Victorian Eye and Ear HospitalMelbourneAustralia. Department of Surgery OphthalmologyThe University of Melbourne32 Gisborne StreetEast MelbourneVIC 3000Australia

Background:Keratoconus(KC)is a common corneal condition with an unknown gender *** numerous studies have investigated the genetic component of KC,no specific genes have yet been attributed to the *** recently reported posterior segment changes occurring in the eyes of KC ***,it is not clear whether these changes are part of KC pathogenesis or reflect changes in anatomical features of the eye manifested by changes at the *** retinal changes represent the main characteristics observed in agerelated macular degeneration(AMD)and that pleiotropy has been demonstrated between different eye diseases,we wished to assess if known AMD associated genes were also associated with ***:A total of 248 KC subjects and 366 non-KC(control)subjects were recruited from public and private clinics in Melbourne for this *** single nucleotide polymorphisms(SNPs)previously associated with AMD,including rs10490924(ARMS2/HTRA1),rs10737680(CFH),rs13278062(TNFRSF10A),rs1864163(CETP),rs2230199(C3),rs3130783(IER3/DDR1),rs334353(TGFBR1),rs3812111(COl10A1),rs429608(C2/CFB),rs4420638(APOE),rs4698775(CFI),rs5749482(TIMP3),rs6795735(ADAMTS9),rs8017304(RAD51B),rs8135665(SlC16A8),rs920915(lIPC),rs943080(VEGFA),rs9542236(B3GAlTl)and rs13081855(COl8A1/FIlIP1l),were genotyped in this *** regression was applied to evaluate the association between these SNPs and KC on both genders together,as well as each gender *** regression was also applied to assess the association between SNPs and corneal *** correction was applied to adjust for multiple ***:Genotyping data were available for 18 *** SNP,rs6795735(ADAMTS9)was significantly associated with KC(p=3.5×10−4)when both genders were assessed,whereas rs5749482(TIMP3)was only associated in males(p=7.7×10−4)following Bonferroni multiple ***,when the covariates of age and gender were included,the associations became non-sign

关键词： Keratoconus Gender Genetic Age-related macular degeneration

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Intraseasonal oscillation of the southwest monsoon over Sri lanka and evaluation of its subseasonal forecast skill

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Atmospheric and Oceanic Science letters 2021年第6期14卷 7-13页

作者： l.A.D Buddika Bandurathna lu Wang Xuan Zhou Yifeng Cheng lin Chen Key laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjingChina laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina

Sri lanka,a small island country located near the southernmost end of the Indian subcontinent,is controlled by the southwest monsoon(SWM)during May to September,when it suffers the most accumulated rainfall in a *** with extensive studies on the intraseasonal oscillation(ISO)of the Indian monsoon,less attention has been paid to the ISO of the SWM over Sri *** on observational data,this study reveals that the leading mode of SWM rainfall shows a significant variability on a 10-35-day time scale,and it accounts for 66%of the fractional *** development of the intraseasonal rainfall anomaly is associated with a westward propagating anomalous cyclonic ***,the skill of current dynamic models in simulating the SWM on the subseasonal time scale was evaluated by using the ECMWF(European center for Medium-Range Weather Forecasts)reforecast data from S2S(the Subseasonal to Seasonal Prediction project).In general,the model is more skillful in predicting the monsoonal wind index than the monsoonal rainfall index,with the skill for the former being beyond 30 days and the latter about two *** forecast skills exhibit prominent interannual differences for both *** is suggested that a correct simulation of the large-scale circulation response to tropical convection is crucial for the subseasonal prediction of monsoonal rainfall over Sri lanka.

关键词： Intraseasonal oscillation Sri lanka Southwest monsoon Subseasonal forecast

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Interference from HONO in the measurement of ambient air NO2 via photolytic conversion and quantification of NO

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journal of Environmental Sciences 2021年第9期33卷 184-193页

作者： Nicholas j.Gingerysty Charles A.Odame-Ankrah Nick jordan Hans D.Osthoff Department of Chemistry University of CalgaryCalgary AB T2N 1N4Canada Global Analyzer Systems ltd. Calgary AB T2E 7L6Canada

The reference method to quantify mixing ratios of the criteria air pollutant nitrogen dioxide(NO_(2)) is NO-O_(3) chemiluminescence(Cl), in which mixing ratios of nitric oxide(NO) are measured by sampling ambient air directly, and mixing ratios of NO_(x)(= sum of NO and NO_(2))are measured by converting NO_(2) to NO using, for example, heated molybdenum catalyst or,more selectively, photolytic conversion(P-Cl).In this work, the nitrous acid(HONO) interference in the measurement of NO_(2) by P-Cl was *** with two photolytic NO2 converters are *** first used radiation centered at 395 nm, a wavelength region commonly utilized in *** second used light at 415 nm, where the overlap with the HONO absorption spectrum and hence its photolysis rate are *** ratios of NO_(2),NO_(x) and HONO entering and exiting the converters were quantified by Thermal Dissociation Cavity Ring-down Spectroscopy(TD-CRDS).Both converters exhibited high NO_(2) conversion efficiency(CF_(NO2);> 90%) and partial conversion of *** of CF against flow rate were consistent with photolysis frequencies of 4.2 s^(-1) and 2.9 s^(-1) for NO_(2) and 0.25 s^(-1) and 0.10 s^(-1) for HONO at 395 nm and 415 nm, *** larger than predicted from the overlap of the emission and HONO absorption *** results imply that measurements of NO2 by P-Cl marginally but systematically overestimate true NO_(2) concentrations,and that this interference should be considered in environments with high HONO:NO_(2) ratios such as the marine boundary layer or in biomass burning plumes.

关键词： Photolytic conversion of NO_(2) HONO interference

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Radiographic Comparisons between Middle Phalanx of the Third Finger and Cervical Vertebrae Maturation for the Assessment of Skeletal Maturity

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journal of Forensic Science and Medicine 2016年第3期2卷 141-145页

作者： Meghana HC Sri Charan KN Pramod GV Ashok l Department of Oral Medicine and Radiology A J institute of Dental Sciences Department of Internal Medicine A J Institute of Medical ScienceMangalore Department of Oral Medicine and Radiology Bapuji Dental College and HospitalDavangereKarnatakaIndia

Sexual maturation characteristics,chronologic age,dental,and skeletal development are some of the more commonly used means to identify stages of *** wrist radiograph and cervical vertebrae maturation index(CVMI)are more reliable for skeletal development *** study was conducted to compare the skeletal maturity using the maturational stages of middle phalanx of the third finger(MP3)with cervical vertebrae and then to evaluate the reliability of MP3 as a sole skeletal maturity assessment *** age group of the 112 subjects was 8-16 years for females and 10-18 years for males were selected for the *** cephalometry and intra oral peri‑apical radiograph of MP3 of the left hand of each patient were ***,statistically it was correlated which was highly *** maturation of MP3 and cervical vertebrae stages progress with advancing chronological *** subjects were advanced on an average of 2 years earlier than male subjects at every stages of growth *** results suggest that MP3 can substitute CVMI for skeletal maturity evaluation to determine optimal treatment time for various orthodontic *** developmental stages of the MP3 could be used as a sole indicator in assessing the skeletal maturity.

关键词： Cervical vertebrae maturation index stages middle phalanx of the third finger stages skeletal maturity

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屠呦呦研究员获诺贝尔生理学或医学奖的启示

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中国科学：生命科学 2015年第11期45卷 1153-1155页

作者：张伯礼张俊华中国中医科学院北京100700 天津中医药大学循证医学中心天津300193

屠呦呦研究员发现了青蒿素,有效降低了疟疾患者的死亡率,获得2015年诺贝尔生理学或医学奖.这是中国科学家的本土研究成果首次获诺贝尔科学奖,书写了多个第一.喜讯传遍全国,振奋人心,颂贺如潮.媒体和大众的极大关注,也引起了各方的深度... 详细信息

屠呦呦研究员发现了青蒿素,有效降低了疟疾患者的死亡率,获得2015年诺贝尔生理学或医学奖.这是中国科学家的本土研究成果首次获诺贝尔科学奖,书写了多个第一.喜讯传遍全国,振奋人心,颂贺如潮.媒体和大众的极大关注,也引起了各方的深度解读和讨论,甚至是争论.众说纷纭,观点激荡,也并非无意义的喧哗,真理越辩越明,争论促进共识的形成.比如,屠呦呦是青蒿素的发现者,

关键词：屠呦呦青蒿素疟疾患者诺贝尔科学奖中医药科技研究成果原创性成果医学研究疾病医学先进科学技术

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Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts

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journal of Energy Chemistry 2020年第8期29卷 1-9,I0001页

作者： A.Emamdoust V.la Parola G.Pantaleo M.l.Testa S.Farjami Shayesteh A.M.Venezia Nanostructure lab Department of PhysicsUniversity of GuilanRashtIran Istituto per lo Studio dei Materiali Nanostrutturati(ISMN-CNR) Via Ugo La Malfa 153PalermoItaly

Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS analyses and they were tested in partial oxidation of methane(CPO). The catalytic reaction was carried out at atmospheric pressure in a temperature range of 400–800℃ with a feed gas mixture containing methane and oxygen in a molecular ratio CH4/O2=2. The Ni catalyst exhibited 60% methane conversion with 60% selectivity to CO already at 500℃. On the contrary, the Ni–Ce catalyst was inert to CPO up to 700℃. Moreover, the former catalyst reproduced its activity at the descending temperatures maintaining a good stability at 600℃, over a reaction time of 80 h, whereas the latter one completely deactivated. Test of CH4 temperature programmed surface reaction(CH4-TPSR) revealed a higher methane activation temperature(> 100℃) for the Ni–Ce catalyst as compared to the Ni one. Noticeable improvement of the ceria containing catalyst occurred when the reaction test started at a temperature higher than the methane decomposition temperature. In this case, the sample achieved the same catalytic behavior of the Ni catalyst. As confirmed by XPS analyses, the distinct electronic state of the supported nickel was responsible for the differences in catalytic behavior.

关键词： Methane catalytic partial oxidation(CPO) Ni catalyst NiCe SiO2 supported catalysts

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Iron–doped bismuth oxybromides as visible-light-responsive Fenton catalysts for the degradation of atrazine in aqueous phases

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journal of Environmental Sciences 2024年第3期137卷 321-332页

作者： Yong-li Cai Yu-Hang Xu ji-Zun Xiang Zhi-Qiang Zhang Qiu-Xiang He Ya-Feng li jian lü Fujian Provincial Key laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Pesticides and its degradation products,being well–known residues in soil,have recently been detected in many water bodies as pollutants of emerging concerns,and thus there is a contemporary demand to develop viable and cost–effective techniques for the removal of related organic pollutants in aqueous ***,a visible-light-responsive Fenton system was constructed with iron–doped bismuth oxybromides(Fe–BiOBr)as the *** the advantage of sustainable Fe(Ⅲ)/Fe(Ⅱ)conversion and optimized H_(2)O_(2)utilization,the optimal Fe–BiOBr–2 catalyst showed an excellent atrazine removal efficiency of 97.61%in 120 min,which is superior than the traditional homogeneous Fenton and the majority of heterogeneous processes documented in the *** this photo–Fenton system,hydroxyl(·OH)and superoxide(·O_(2)^(-))radicals were dominant active species contributed to the oxidative degradation of *** to the production of various active radicals,five degradation pathways were proposed based on the identification of intermediates and degradation ***,this work not only demonstrates a fundamental insight into creating highly efficient and atom economic photo-Fenton systems,but also provides a complementary strategy for the treatment of organic pollutants in water.

关键词： Bismuth oxybromide Photo–Fenton Atrazine Catalytic degradation

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Central nervous system vasculitis and polyneuropathy as first manifestations of hepatitis C

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World journal of Gastroenterology 2012年第2期18卷 188-191页

作者： Roberto j Carvalho-Filho janaína luz Narciso-Schiavon luciano Hl Tolentino leonardo l Schiavon Maria lucia G Ferraz Antonio Eduardo B Silva Division of Gastroenterology Hepatitis SectionFederal University of Sao Paulo04037-003 Sao PauloBrazil

Sensory or motor peripheral neuropathy may be observed in a significant proportion of hepatitis C virus (HCV)-infected ***,central nervous system (CNS) involvement is uncommon,especially in cryoglobulin-negative *** describe a case of peripheral neuropathy combined with an ischemic CNS event as primary manifestations of chronic HCV infection without *** improvement was observed after antiviral *** discuss the spectrum of neurological manifestations of HCV infection and review the literature.

关键词： Hepatitis C Central nervous system Poly-neuropathy Interferon-α

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The effects of prosodic phrase boundary on the pitch lowering of downstep and focus

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Chinese journal of Acoustics 2019年第3期38卷 340-352页

作者： GUO jingyi HUANG Xianjun lüShinan YANG jinchen Beijing Key laboratory of learning and Cognition and Department of Psychology Capital Normal UniversityBeijing 100048 Institute of Acoustics Chinese Academy of SciencesBeijing 100190 BrainCo Inc.Somerville MassachusettsUSA

The effects of prosodic phrase(PP)boundary on the pitch lowering of downstep and focus,as well as the domains of them were investigated in Chinese Putonghua,by using designed sentences which consist of two prosodic phrases(i.e.,PP1,PP2).The results showed that:(1)The PP boundary blocked the downstep effect in the preceding phrase,indicating that PP is the domain of downstep.(2)The post-focus F0 lowering effect in PP1 spread across the PP boundary and lower the FO contour of *** there is a downstep effect in PP2,the postboundary compression effect of the prior focus will accumulate with the downstep,producing further lowered ***,the domain of focus is an intonational phrase(IP).(3)When there is one contrastive focus in each phrase,the outstanding pitch reset elicited by the second focus will block the FO lowering effect of PP1 onto PP2,and the two foci are realized independently.

关键词： domain The effects of prosodic phrase boundary on the pitch lowering of downstep and focus

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