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Comparative studies on Y(Ⅲ)and Dy(Ⅲ)extraction from hydrochloric and nitric acids by Cyanex 572 as a novel extractant

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Journal of Rare Earths 2018年第12期36卷 1342-1350页

作者： N.E.El-hefny m.S.Gasser sh.sh.Emam W.h.mahmoud h.F.Aly hot laboratories Centre Atomic Energy Authority Faculty of Science Ain Shams University

Extraction of Y(III) and Dy(III) from hydrochloric and nitric acids by Cy-572 in kerosene was studied. The factors affecting the extraction were separately investigated. The stoichiometry of the extracted species was deduced on the basis of slope analysis method. Evaluation of extraction equilibrium and stripping investigation was studied as well as saponification effect of Cy-572. The composition of the extracted metal species in the organic phase was found to be [mA·(hA)] for Y(III) or Dy(III) in both media.1.0 mol/l hCI is the best stripping agent for each metal ion from the studied acidic media in one *** Cy-572 does not exhibit any selectivity towards the extraction of Y(III) or Dy(III) from both hCI and hNOsolutions. Based on the obtained results, the data were compared and the separation feasibility between lanthanides and Y(III) in the two media was discussed.

关键词： Extraction Cyanex-572 Yttrium lanthanides Separation factor Saponification

Prediction of yttrium, lanthanum, cerium, and neodymium leaching recovery from apatite concentrate using artificial neural networks

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Journal of University of Science and Technology Beijing 2008年第4期15卷 367-374页

作者： E. Jorjani A.h. Bagherieh sh. mesroghli S. Chehreh Chelgani Department of mining Engineering Research and Science Campus Islamic Azad University Poonak Hesarak Tehran Iran

The assay and recovery of rare earth elements （REEs） in the leaching process is being determined using expensive analytical methods： inductively coupled plasma atomic emission spectroscopy （ICP-AES） and inductively coupled plasma mass spectroscopy （ICP-mS）. A neural network model to predict the effects of operational variables on the lanthanum, cerium, yttrium, and neodymium recovery in the leaching of apatite concentrate is presented in this article. The effects of leaching time （10 to 40 min）, pulp densities （30% to 50%）, acid concentrations （20% to 60%）, and agitation rates （100 to 200 r/min）, were investigated and optimized on the recovery of REEs in the laboratory at a leaching temperature of 60℃. The obtained data in the laboratory optimization process were used for training and testing the neural network. The feed-forward artificial neural network with a 4-5-5-1 arrangement was capable of estimating the leaching recovery of REEs. The neural network predicted values were in good agreement with the experimental results. The correlations of R=l in training stages, and R=0.971, 0.952, 0.985, and 0.98 in testing stages were a result of Ce, Nd, la, and Y recovery prediction respectively, and these values were usually acceptable. It was shown that the proposed neural network model accurately reproduced all the effects of the operation variables, and could be used in the simulation of a leaching plant for REEs.

关键词： apatite neural networks rare earth elements leaching recovery

lanthanide amino acid Schiff base complexes:synthesis,spectroscopic characterization,physical properties and in vitro antimicrobial studies

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Journal of Rare Earths 2013年第7期31卷 715-721页

作者： Samir Alghool m.sh.Zoromba hanan F.Abd El-halim Department of Chemistry Faculty of SciencePort Said UniversityPort Said 42521Egypt Department of Chemistry Faculty of PharmacyMisr International UniversityIsmailia RoadKm 28 CairoEgypt

Complexes of la （III）, Nd（III）, Gd（III）, Sm（III）, and Ce（IV） were synthesized with Schiff base [（3,5-di-tert-butyl-2-hy- droxybenzyl） amino] acetic acid （h3l）. The ligand and its complexes were synthesized and characterized based on the following analysis： elemental analyses, FAB-mass, molar conductance measurements, magnetic measurement, UV-visible, IR, and NmR spectral studies. The spectral data revealed that the ligand acted as a neutral tridentate coordinating to metal ion through ONO donor sequence. Thermal degradation studies of the ligand and its complexes showed that the previous lanthanide complexes were more thermally stable than the ligand itself. The Schiff base and its complexes were screened for their antibacterial （Escherichia coli, Staphylococcus aureus） and antifungal （Aspergillus flavus and Candida Albicans）.

关键词： lanthanide Schiffbase complexes physical properties biological activity rare earths

Radiation of Ultra low Frequency Electromagnetic Waves from Atmosphere under the Influence of Strong shock Waves

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Chinese Physics letters 2015年第3期32卷 39-41页

作者： A. R. Aramyan S. A. Aramyan S. G. Bilen l. sh. Grigoryan h. F. Khachatryan Institute of Applied Problems of Physics National Academy of Sciences of Armenia Yerevan 0014 Republic of Armenia International Scientific and Educational Center National Academy of Sciences of Armenia Yerevan 0019 Republic of Armenia Pennsylvania State University University Park PA USA

We present preliminary results from the experimental investigation of the response of the atmosphere due to the impact of powerful shock waves. The response is evidenced as ultra low frequency electromagnetic wave radiation at frequency of 2-5 khz and in duration of 3 7s. We hypothesize that this radiation appears due to the following process： the shock wave ionizes the neutral particles in the air and these charged and neutral particles continue their vertical motion, which forms in the trail of the shock wave. Such motion can cause the cyclotron-like radiation measured.

关键词： Radiation of Ultra low Frequency Electromagnetic Waves from Atmosphere under the Influence of Strong shock Waves

Fabrication of Silicon Quantum Wires by Conventional Silicon Processing

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high Technology letters 1995年第1期1卷 25-27页

作者： Yi, sh. Jianlin, l. Feng, W. Rong, Zh. Ping, h. shulin, G. shunming, Zh. Baohua, m. Youdou, Zh. Nanjing Univ Nanjing China

Ultra fine silicon quantum wires with the Si/SiO2 heterointerface have been fabricated successfully by using reactive ion etching, anisotropic wet chemical etching and subsequent thermal oxidation. The cross-sectional image of scanning electron microscope shows the silicon quantum wires of high quality with the linewidth down to 20nm. The present method has many remarkable advantages, which is important to the study of low-dimension quantum physics and devices.

关键词： Quantum wire Silicon Silicon dioxide Silicon technique

Essential commutant of analytic Toeplitz operators

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Chinese Science Bulletin 1997年第7期42卷 548-552页

作者： Ding, Xh Sun, sh Department of mathematics Sichuan Union University Chengdu China

lET Bn be the unit ball of Cn. The n-dimensional vector space over the complex field C, Sn=（?）Bn is the boundary of Bn. We use σ to denote the unique rotation-invariant probability measure on Sn. The lebesgue space... 详细信息

关键词： Toeplitz operators inner function essential commutant.

Induction of apoptosis by arsenic trioxide and hydroxycamptothecin in gastric cancer cells in vitro

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World Journal of Gastroenterology 2000年第4期6卷 532-539页

作者： Tu SP Zhong J Tan Jh Jiang Xh Qiao mm Wu YX Jiang sh shanghai Second med Univ Ruijin Hosp Dept Gastroenterol Shanghai 200025 Peoples R China

AIm To study the effects of arsenic trioxide andhCPT on different degrees of differentiated gastriccancer cells（SGC-7901,mKN-45,mKN-28）withrespect to both cytotoxicity and induction ofapoptosis in *** The cytotoxicity of As2O3 and hCPTon gastric cancer cells was determined by *** changes of apoptosis ofgastric cancer cells were observed by lightmicroscopy and transmission electron *** and cell cycle changes of gastric cancercells induced by hCPT and As2O3 were investigatedby TUNEl method and flow *** As2O3 and hCPT had remarkablecytotoxic effects on different degrees ofdifferentiated gastric cancer *** IC50ofAs2O3 on well differentiated gastric cancer cellmKN-28,moderately differentiated gastric cancercell SGC-7901,and poorly differentiated gastriccancer cell mKN-28 were 8.91 μmol/l,10.57μmol/l,and 11.65 μmol/l,*** IC50of hCPT on mKN-28,SGC-7901,and mKN-45 were9.35 mg/l,10.21 mg/l,and 12.63 mg/lrespectively after 48 h *** 12 h ofexposure to both drugs,gastric cancer cellsexhibited morphologic features of apoptosis,including cell shrinkage,nuclear condensation, and formation of apoptotic bodies.A typicalsubdiploid peak before G0/G1 phase was observedby flow *** apoptotic rates of SGC-7901,mKN-45,and mKN-28 were 13.84%,22.52%,and 9.68%,respectively after 48 hexposure to 10 μmol/l As2O3.The apoptotic ratesof SGC-7901,mKN-45,and mKN-28 were 21.88%,12.35%,and 30.26%,respectively after 48 hexposure to 10 mg/l *** apoptotic indicewere 7%-15% as assessed by TUNEl *** effect of As2O3 on SGC-7901 showedremarkable cell cycle specificity,which inducedcell death in G1 phase,and blocked G2/m *** also showed a remarkable cell cyclespecificity,by inducing cell death and a

关键词： gastric cancer apoptosis arsenic trioxide hydroxycamptothecin

Characterization of Genetic and Phenotypic Diversities in the Potato （Solanum tuberosum l.） Population in Kosovo

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Journal of Agricultural Science and Technology(B) 2011年第6期1卷 925-931页

作者： S. A. Aliu sh. sh. Fetahu I. R. Rusinovci B. h. Zogaj Department of Crop Science Faculty of Agriculture University of Prishtina Bill Clinton Street. N.N. 10000 Prishtina Kosovo

The presence and introduction of new potato cultivars in Kosovo has increased the yield per unit area but reduced the cultivation of native potato population. Indigenous potato is linked to specific adaptations to local fanning system and specific agro ecological conditions. This research was conducted in Prishtina region which is located in the Kosovo agro ecological region （42°38′97″ latitude and 21°08′45＂ longitude at 574 m.a.s.l ）. Plant material used in this research was 18 potato accessions with different origins. The experimental design was a randomized complete block （RCB） with three replicates, while the plot sizes were 4.20 m^2. All observation and analysis were carried out on 12 plants from each accession. All characters were measured in the field and laboratory at the normal harvest time. morphological diversity was characterized using standard descriptors. The genetic diversity studies of the investigated potato accessions showed significant genetic variation on 17 physiological and chemical parameters, which could be largely due to that they were of different origins. The genetic diversity of potato cultivars offers a wealth of natural resources from which breeders can select the most desirable genotypes based on their favorable traits.

关键词： Potato accession descriptors diversity minerals.

Assessment of microbial Diversity in Different sea areas by the method of T-RFlP

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Assessment of Microbial Diversity in Different sea areas by ...