Effects of Rare Earth Ions on NMR Spectrum of Anticoagulation Factor from Snake Venom

Ｔｈｅａｎｔｉｃｏａｇｕｌａｔｉｏｎｆａｃｔｏｒ (ＡＣＦ)ｆｒｏｍｔｈｅｖｅｎｏｍｏｆＡｇｋｉｓｔｒｏｄｏｎａｃｕｔｕｓｉｎＳｏｕｔｈｅｒｎＡｎｈｕｉ,Ｃｈｉｎａ ,ｐｏｓｓｅｓｓｅｓｍａｒｋｅｄａｎｔｉｃｏａｇｕｌａｎｔａｃｔｉｖｉｔｙ[1] .Ｔｈｅ1Ｈ 1 ＤＮＭＲａｎｄ1Ｈ 2 Ｄｓｈｉｆｔ ｅｄｃｏｒｒｅｌａｔｅｄ (ＣＯＳＹ 90 )ｓｐｅｃｔｒａｏｆＡＣＦｈａｖｅｂｅｅｎｄｅｔｅｒｍｉｎｅｄ ,ａｎｄｔｈｅαＨａｎｄβＨｏｆｔｈｅＡｌａｓｉｄｅｃｈａｉｎｉｎＡＣＦｈａｖｅｂｅｅｎａｓｓｉｇｎｅｄ[2 ] .Ｔｈ…     

Effect of Rare Earth Element Cerium on Mechanical Properties and Morphology of TiN Coating Prepared by Arc Ion Plating

TiN coatings were deposited on polished substrates of W18Cr4V high speed steel by means of vacuum arc ion plating. The effect of cerium on adhesion between TiN coating and substrate was studied. The microstructures and composition of TiN coatings were also investigated by means of scanning electron microscope (SEM), Auger electron spectroscopy (AES), and X-ray diffraction (XRD) technique. It was found that cerium is an effective modifying agent and the addition of suitable amount of cerium to TiN coatings can produce relatively excellent properties such as micro-hardness, wear resistance, oxidation resistance and porosity. The experimental results show that the added cerium in TiN coatings makesa contribution to form the preferred direction along with a (111 ) or (222) close packed face, which may be one of the reasons that improves some properties mentioned above.     

Study on Extracting Rare Earth from Sulfate System by Long-Chain Fatty Acid

The extraction of rare earths by long-chain fatty acid in kerosene from sulphate system was described.It was demonstrated from the experimental results that the ratio of kerosene: fatty acid: isooctanol = 55 : 30: 15 ( V/V),By the saturation capability method and the slope method, the extracted reaction mechanism of the extraction of rare earth was studied.It is shown that the extraction reaction conform to the cation exchange reaction mechanism.The extracted sequence of rare earth was determined in this system and it is shown that there is no tetrad effect and the position of yttrium is between lanthanum and cerium.     

Study on Y-Base Rare Earth Alloy in Ultra-High Hardfacing

The effect of Y-base rare earth alloy in ultra-high hardfacing was observed by means of OM, SEM and XRD. Precipitated carbide can be metamorphosed and spheroidized in surfacing by adding Y-base rare earth alloy, which contributes to the increase of precipitated carbide. Rare earth combined with oxygen and sulfur can improve the morphology of slag inclusion as well as purify surfacing. The result shows proper rare earth alloy in surfacing can fine its microstmcture, improve hardness and impact toughness.     

富集稀土磷酸溶液中稀土的萃取研究

研究了P204从富集稀土磷酸溶液中稀土元素钇、镧、钕的萃取行为,并考察了初始水相中P_2O_5浓度、萃取相比、萃取剂浓度、萃取时间对稀土萃取效果的影响。结果表明,低磷酸浓度、较大相比、较高萃取剂浓度和较长萃取时间有利于萃取稀土,并得到了萃取优化条件:初始水相中P_2O_5浓度10%、萃取相比V_0/V_1=3/1、萃取时间15min、P204浓度30%,在室温下萃取钇、镧、钕3种稀土,单级萃取率均可达到90%以上。     

The Effect of Lanthanide and Transition Metal Ions on the Fluorescence Spectra for the Anticoagulation Factor of Snake Venom

The effect of lanthanide and transition metal ions on the fluorescence spectra of theanticoagulation factor(ACF)of snake venom has been studied.It is postulated that the quenching oftryptophan residue fluorescence by lanthanide and transition metal ions is caused by the metal ion-inducedconformation change of ACF.     

包钢尾矿回收稀土的试验研究

对包钢尾矿坝的稀土进行了选矿工艺研究,在实验室里探索用串级闭路工艺回收包钢尾矿坝中的稀土,为白云鄂博矿稀土的可持续发展寻找新的资源综合利用方向。所阐述的工艺可以使稀土的品位达到60%,回收率达到87%,完全可以达到工业生产的标准,并且同时对萤石做了一定的工作,为下一步萤石的回收提出了看法。     

Bio-Effect of Rare Earths in RE-High Background Region I. Some Blood Biochemical Indices from Population Resided in Light REE District

Bio-Effect of Rare Earths in RE-High Background Region I. Some Blood Biochemical Indices from Population Resided in Light REE District     

Study on Preparation and Properties of PVC Film Modified by Rare Earth

The transparent PVC films were prepared by tape casting. In the process of preparation, rare earth nitrate, as a kind of modifier, was added to the solution of PVC and THF. These PVC films were tested after being crosslinked by ultraviolet light. It is found that the mechanical and physical properties of all the PVC films modified by rare earth nitrate are greatly enhanced.     

含铀钍氯化稀土溶液中离子交换法提铀

提出了一种利用铀酰离子与Cl-的络合,从高稀土低铀的含氯体系浸出液中分离提取铀而将大部分的稀土元素和钍留在浸出液中的离子交换法。研究了离子吸附过程中体系pH和氯离子浓度等对吸附效果的影响。结果表明,在反应pH=0~1、Cl-浓度7 mol/L的优化条件下,饱和树脂对铀的吸附量能够达到43.34 mg/g。后续采用7 mol/L HCl溶液酸洗和去离子水淋洗,回收钍和稀土的同时实现了铀的分离提取。该技术不改变传统稀土提取工艺流程,仅增加铀提取工艺技术单元,可实现铀的分离与浓缩,具有工艺流程短、不影响原有稀土提取工艺和矿产最大化利用的特点。     

低氯根晶型少钕碳酸稀土研究

在不同的工艺条件下能生产出晶型型貌不同的少钕碳酸稀土。在适宜条件下可以生产出氯根含量较低、晶型晶貌为珠菊状的少钕碳酸稀土,可满足客户要求。     

Study on Adsorption of Rare Earth Elements by Kaolinite

Rareearthelements (REEs)werewidelyappliedtotracingthesourcesofmaterialsandtostudyingtheirevolutionprocessesinmanyfieldsofearthscienceinconsiderationoftheirsimilarityandsystematicdiffer enceinchemicalproperties .Furthermore ,lanthanidesarebothimportantprod…     

Study on Lithium Fast Ion Conductors of Li3x La0.67-x Iny Ti1-2y Py O3 System

Awidevarietyofsolidelectrolytes (alsobecalledfastionconductors)withhighionicconductivityhasbeendiscoveredforthelasttwodecades[1] .LithiumionconductorsareamongthemostattractivebecauseLisystemholdsthegreatpromiseofhighenergydensi tybatteries ,duetoreasonablecost,highopencircuitvoltagesandlowequivalentweights .However ,theconductivitiesaretoolowtobeputintopractice .Therefore ,moreandmoreattentionsarefocusedonfindinghighconductivitylithiumsolidelectrolytesthatcanbeemployedinthefullsolid statebatte…     

三烷基氧化膦萃取稀土元素的研究

研究了国产三烷基氧化膦(混合)对稀土元素La～Gd及Y硝酸盐的萃取.试验了30%三烷基氧化膦(TRPO)-煤油-硝酸体系中水相酸度0.5mol/L～7mol/L范围内轻稀土元素的分配比和相邻两稀土元素的分离因子,测定了TRPO稀土萃合物的组成,探讨了γ射线辐照对稀土元素萃取性能的影响.     

Study on Inhibition Effects of Rare Earths on Superoxide Anion Radical by Using Pulse Radiolysis

Study on Inhibition Effects of Rare Earths on Superoxide Anion Radical by Using Pulse Radiolysis     

Study on Spectral Overlap Model for Energy Transfer between J-Multiplets in Rare Earth-Doped Crystals

Based on the experimental data of KY3F10：Tm3^ reported by Dial, Kushida‘s spectral overlap model (SOM) of energy transfer between J-multiplets was studied. Firstly, with the help of the Inokuti-Hirayama and Yokota-Tanimoto models, the luminescence decay curve of ^3H4 of Tm^3 ion was fitted, and the fitted values of corresponding interaction parameters CDA of energy transfer and CDD of energy migration were obtained. Secondly, by compared with Kushida‘‘s SOM in which the relevant Judd-Ofelt approximative transition rates are known, the average overlap integrals of SOD and SDA were obtained. For S DD, how to treat the contribution of the electronic-dipole (ED) crystal field transition forbidden by C4v site symmetry in the calculation of SDD was discussed. For SDA we suggested that, by including the contribution of the phonon sidebands in the analysis of oscillator strength of transition, Kushida‘‘s SOM of ED-ED resonant energy transfer rate can be extended to non-resonant phonon-assisted D-A energy transfer. The strengths and widths of phonon sidebands in this example were discussed, and the results were reasonably good.     

Study on Rare Earth-Containing Phases in TiAl Based Alloys Prepared by Non-Equilibrium Solidification Processing

Ｍｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏｒａｐｉｄｓｏ ｌｉｄｉｆｉｃａｔｉｏｎ (ＲＳ)ｔｅｃｈｎｉｑｕｅｓｓｉｎｃｅＤｕｗｅｚｉｎ ｖｅｎｔｅｄ“ｇｕｎ”ｍｅｌｔｉｎｇｔｅｃｈｎｉｑｕｅｗｈｉｃｈｏｂ ｔａｉｎｅｄｃｏｏｌｉｎｇｒａｔｅｓａｓｈｉｇｈａｓ 1 0 7Ｋ·ｓ-1ｉｎ1 96 0ｓ[1] .Ａｓｐｏｔｅｎｔｉａｌｓｔｒｕｃｔｕｒｅｍａｔｅｒｉａｌｕｓｅｄａｔｅｌｅｖａｔｅｄｔｅｍｐｅｒａｔｕｒｅｓ ,ＴｉＡｌｂａｓｅｄａｌｌｏｙｓｈａｖｅｂｅｅｎｌａｉｄｍｕｃｈｅｍｐｈａｓｉｓｉｎｔｈｅｌａｓ…     

Study on Heterogeneous Nuclei in Cast H13 Steel Modified by Rare Earth

Ｔｈｅｐｏｏｒｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｃａｓｔｍａｔｅｒｉａｌｓ ,ｅｓｐｅｃｉａｌｌｙｌｏｗｔｏｕｇｈｎｅｓｓ ,ｉｓａｍａｉｎｆａｃｔｏｒｌｉｍｉｔｉｎｇｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｐｒｅｃｉｓｅｃａｓｔｄｉｅｓ[1] .ＴｈｒｏｕｇｈｔｈｅｍｏｄｉｆｉｃａｔｉｏｎｏｆｃａｓｔＨ1 3ｓｔｅｅｌｂｙＲＥ ,ｔｈｅｄｅｎｄｒｉｔｅｓｅｇｒｅｇａｔｉｏｎｏｆＣＨ1 3ｓｔｅｅｌｗａｓｉｍｐｒｏｖｅｄａｎｄｇｒａｉｎｂｏｕｎｄａｒｙｃａｒｂｉｄｅｗａｓａｌｓｏｕｎｄｅｒｃｏｎｔｒｏｌ.Ａｃｃ…     

氨基膦酸螯合树脂离子交换色层法分离重稀土的研究

采用离子交换色层法用氨基膦酸螯合树脂对重稀土铥、镱、镥富集物进行动态吸附和淋洗分离研究,考察了淋洗剂浓度、酸度、淋洗液流速、温度等因素对分离的影响。结果表明,在吸附柱中,以0.1mL/(cm2.min)的流速进料时能得到较大的吸附率;在淋洗液流速为0.3mL/(cm2.min)、温度30℃的条件下,用pH=8.0、浓度0.02mol/L的EDTA淋洗重稀土富集物,可实现铥、镱、镥三者的完全分离。