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Rare earth metals sorption recovery from uranium in situ leaching process solutions

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Rare Metals 2015年第3期34卷 195-201页

作者： N.M.shokobayev C.Bouffier T.s.Dauletbakov Department of Uranium and Associated Elements LLP Institute of High Technologies Department of Nonferrous Metals Metallurgy Kazakh National Technical University Named After K.I.Satpayev

sorption characteristics of ion exchange resins 001 × 7, 005 × 8, D72 regarding rare earth metals （REM） during extraction from barren solution of uranium sorption in dynamic conditions were investigated. It was identified that D72 resin capacity on analyzed REM was 2.46 ***-3 after passing 220 BV （bed volume） of initial solution with 95 % recovery of element of REM with the lowest affinity. Researches on REM desorption in dynamic conditions from investigated ion exchange resins by solution of 1.7 mol.L-1 HNO3 and 8.0 mol.L-1 NHnNO3 with 0.2 mol.L-1 HNO3 passing were carded out. It was identified that using desorption solution based on ammonium nitrate allows to achieve acceptable recovery degree of REM from the resin. The possibility of organization of a circulating desorption solution system increases the perspectives of nitrate ammonium solution usage.

关键词： Uranium in situ leaching sorption Co-recovery Rare earth metals

FOREIGN DIRECT INVEsTMENT AND ITs IMPACT ON CHINA's ECONOMY: A REsEARCH APPRAIsAL

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Journal of Geographical sciences 1997年第1期7卷 33-45页

作者： Xiaojian Li Department of Geography, Henan University, Kaifeng 475001 People’s Republic of China

Foreign direct investment (FDI) and the development of the hosted nations is a major issue facing researchers in many disciplines, especially in economic geography. This paper reviews the current available literature pertaining to the impact of FDI on the economic development in China, and emphasizes four points. First, although China is the second largest of FDI recipient and one of the fastest growing nations in the world, it has not drawn enough attention of researchers on the topic. And very few publications are found specifically focusing on the economic impact of FDI. second, many areas of the impact of FDI have remained untouched. Particularly, there are needs for further studies to address the impact of FDI on efficient use of resources and overall competitiveness of the country. Third, in the theoretical aspect, research should explore the nature of bargaining power of all participants. Finally, it is suggested to select a number of case study areas and foreign funded enterprises for in depth studies.

关键词： Foreign Direct Investment development China.

CHINA's URBAN HOUsING sYsTEM IN TRANsITION

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Journal of Geographical sciences 1995年第1期5卷 10-30页

作者： Gu Chaolin (Institute of Geography, CAs, Beijing 100101People’s Republic of China)

This paper discusses transition of urban housing system andhousing policy issues in China. It focuses on China's urban housing systemand future housing policies some of the main contexts to be discussed are:(1) the process and characterstics of housing development in new China, (2)the weaknesses of the old urban housing system; (3) reforms of the urbanhousing system; (4) China's housing markets in transition; (5) Current urbanhousing reform policy dilemmas; (6) experiences from developed countries;(7) main housing policy issues in the western world, and (8) ways to dealwith the dilemmas.

关键词： urban housing system reform of the urban housing system urban housing market urban housing policy China

Photoluminescence properties of a novel orange-red emitting Ba_2CaZn_2si_6O_(17):sm^(3+)phosphor

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Journal of Rare Earths 2016年第6期34卷 576-582页

作者： G.Annadurai s.Masilla Moses Kennedy V.sivakumar Department of Physics S.S.N.College of EngineeringRajiv Gandhi SalaiKalavakkam-603 110ChennaiTamil NaduIndia saveetha Engineering College Thandalam-602105ChennaiIndia

Novel orange-red emitting Ba_2Ca_（1–x）Zn_2si_6O_（17）：x sm^（3＋）（0.02≤x≤0.08） phosphors were synthesized using conventional solid-state reaction method under air atmosphere. The phase formation of the samples was characterized by powder X-ray diffraction patterns. scanning electron microscopy（sEM） and photoluminescence properties were also investigated. The narrow excitation and emission spectra indicated the typical 4f-4f transitions of sm^（3＋）. The dominant excitation line was around 405 nm attributed to ~6H_（5/2）→ ~4F_（7/2） and the emission spectrum consisted of four emission peaks at 562, 600, 647, and 708 nm corresponding to the various transitions ~4G_（5/2） to ~6HJ（J=5/2, 7/2, 9/2 and 11/2） of the sm^（3＋） ions in the same order. The strongest emission band located at 600 nm was attributed to ~4G_（5/2）→~6H_（7/2） transition of sm^（3＋）, producing bright orange-red color emission. The optimal dopant concentration of sm3＋ ion in Ba_2CaZn_2si_6O_（17）：x sm^（3＋） phosphor was around 4 mol.% and the critical transfer distance（Rc） of sm^（3＋） was calculated to be 2.65 nm. Decay time varied with the sm^（3＋） concentrations in Ba_2 CaZn_2si_6O_（17） phosphors. In addition, the Commission International del＇Eclairagethe（CIE） chromaticity coordinates of Ba_2Ca_（0.96）Zn_2si_6O_（17）：0.04sm^（3＋） phosphor was located in the orange-red region（0.547, 0.450） and the correlated color temperature（CCT） was 2543 K. The present results indicated that sm^（3＋） activated Ba_2CaZn_2si_6O_（17） phosphors may be used as an orange-red emitting phosphor for near-ultraviolet（n-UV） based white light emitting diodes（WLEDs） applications.

关键词： sm^(3+) phosphors photoluminescence WLEDs rare earths

Carnosine and crocin ameliorate oxidative stress in rats with rhabdomyolysis-induced acute kidney injury through upregulating HO-1 gene expression

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Food Bioscience 2022年第5期49卷 904-914页

作者： Nahla E.El-Ashmawy Eman G.Khedr Ahmed s.Doghish Mohammed s.Elballal Department of Biochemistry Faculty of PharmacyTanta UniversityTantaEgypt Department of Biochemistry Faculty of PharmacyBadr University in Cairo(BUC)Badr CityCairo11829Egypt Department of Biochemistry and Molecular Biology Faculty of Pharmacy(Boys)Al-Azhar UniversityNasr CityCairo11651Egypt

We aimed to investigate whether carnosine(a natural dipeptide found in humans)and crocin(a natural product extracted from saffron and gardenia)can prevent the harmful effects of acute kidney injury(AKI)caused by glycerol-induced rhabdomyolysis with a focus on the role of the nuclear factor E2-related factor-2/heme oxygenase-1(Nrf2/HO-1)signaling ***-six male Wistar rats were divided into 6 groups:3 of them received saline,carnosine,and crocin IP for 7 days and the other 3 groups received the same treatment in addition to a single IM injection of 50%glycerol(10 ml/kg,divided between the two limb muscles)on 8th *** animals were sacrificed after 24 h of the IM *** samples,muscles,and kidneys were collected for further *** was evidenced by the histopathological alterations in muscle sections and increased levels of myoglobin in kidney tissue homogenate *** injury was characterized by increased creatinine,kidney injury molecule-1,malondialdehyde,nitric oxide,and decreased catalase *** injury also increased inflammatory markers and histopathological alterations in kidney *** these effects were corrected by pretreatment with carnosine and *** agents could also elevate HO-1 gene ***,both agents failed to restore the declined Nrf2 expression in glycerol-treated *** and crocin can effectively prevent rhabdomyolysis-induced AKI in rats through augmenting gene expression of HO-1 and antioxidant system and suppressing the generation of reactive oxygen species,lipid peroxidation,and inflammatory response.

关键词： Carnosine Crocin Acute kidney injury Rhabdomyolysis Antioxidant

Electromagnetic properties of the Pc(4312) pentaquark state

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Chinese Physics C 2021年第2期45卷 341-350页

作者： UlaşÖzdem Health services Vocational school of Higher Education Istanbul Aydin UniversitySefakoy-Kucukcekmece34295 IstanbulTurkey

Using the light-cone QCD sum rules,we evaluate the magnetic moment of the P_c(4312) pentaquark state by considering both the \bar D\sigma_c molecular and diquark-diquark-antiquark state,with quantum numbers J^P=2/1^(-1).In the calculations,we use the diquark-diquark-antiquark and molecular form of the interpolating currents for the P_(c4312) pentaquark and the distribution amplitudes of the *** numerical results for the magnetic moment obtained using the two different pictures are quite different from each other,which can be used to pin down the underlying structure of P_(c4312) .Any experimental measurement of the magnetic moment in the near future will provide an understanding of the internal structure of this pentaquark state.

关键词： pentaquarks magnetic moment molecular picture diquark-diquark-antiquark picture

Two-Phase Flow Modeling in a single Closed Loop Pulsating Heat Pipes

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Journal of Donghua University(English Edition) 2007年第4期24卷 439-444页

作者：杨洪海 sameer Khandekar sanka V. V.s. N.s. Manyam Manfred Groll College of Environmental science and Engineering Donghua University Institute of Nuclear Technology and Energy system University of Stuttgart70569 StuttgartGermany

Mathematical modeling of pulsating heat pipes through ‘first’ principles is a contemporary problem which remains quite elusive. simplifications and assumptions made in all the modeling approaches developed so far render them unsuitable for engineering design. In this paper, a more realistic modeling scheme is presented which provides considerable try for thought toward the next progressive step. At high enough heat flux level, closed loop pulsating heat pipes experience a bulk internal unidirectional fluid circulation. Under such a condition, conventional two-phase flow modeling in capillary tubes may be applied. This has been attempted for single-loop PHPs. A homogeneous model and a separated two-fluid flow model based on simultaneous conservation of mass, momentum and energy, have been developed for an equivalent ‘open flow’ system. The model allows prediction of two-phase flow parameters in each sub-section of the device thereby providing important insights into its operation. The concept of ‘void fraction constraint’ in pulsating heat pipe operation is introduced and its relevance to future modeling attempts is outlined.

关键词： Closed loop pulsating heat pipe flow modeling parametric influences

Materials databases for the computational materials scientist

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 303-308页

作者： Marcel H.F. sluiter Darko simonovic Emre s. Tasci Materials science and Engineering 3ME Delft University of Technology Materials innovation institute M2i Física de la Materia Condensada Universidad del Pais Vasco

Until recently, many computational materials scientists have shown little interest in materials databases. This is now changing be-cause the amount of computational data is rapidly increasing and the potential for data mining provides unique opportunities for discovery and optimization. Here, a few examples of such opportunities are discussed relating to structural analysis and classification, discovery of correlations between materials properties, and discovery of unsuspected compounds.

关键词： database systems materials data mining ab initio prediction structural analysis

Advances in the prognosis of soil sodicity under dryland and irrigated conditions

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International soil and Water Conservation Research 2014年第4期2卷 50-63页

作者： Ildefonso Pla sentís Universitat de Lleida LleidaSpain

salt-affected soils,both saline and sodic,may develop under both dryland and irrigated conditions,affecting the physical and chemical soil properties,with negative consequences in the environment,in crop production and in animal and human *** the development processes of salt-affected soils,the processes of sodification have generally received less attention and are less understood than the development of saline *** in both,hydrological processes are involved in their development,in the case of sodic soils we have to consider some additional chemical and physicochemical reactions,making more difficult their modeling and *** is especially true where we have to consider the effects of the groundwater level and *** this contribution there are presented three case studies:one related to the development of sodic soils in the lowlands of the Argentina Pampas,under dry-land conditions with sub-humid temperate climate and pastures for cattle production;the second deals with the development of sodic soils in the Colombia Cauca Valley,under irrigated conditions and tropical sub-humid climate,in lands used for sugarcane cropping dedicated to sugar and ethanol production;and the last one related to the sodification of soils in the Western Plains of Venezuela,under irrigated conditions,sub-humid tropical climate and continuous cropping of rice under *** development of sodicity in the surface soil is partially related to the composition and level of the ground-water,mainly affected in the Argentina case by drainage conditions,in the case of Colombia to the inefficient irrigation and inadequate drainage,and in the case of Venezuela to the soil management and irrigation *** is shown how the model sALsODIMAR,developed by the author,based on the balance of water and soluble components of both irrigation water and ground-water,under different water and land management conditions,may be successfully adapted for the diagnosis

关键词： sodicitiy Models Hydrology Ground water