SUBSTITUTE CALIBRATION APPLIED TO ISOTOPIC RATIO MEASUREMENT OF ERBIUM

ＳＵＢＳＴＩＴＵＴＥ　ＣＡＬＩＢＲＡＴＩＯＮ　ＡＰＰＬＩＥＤ　ＴＯ　ＩＳＯＴＯＰＩＣ　ＲＡＴＩＯ　ＭＥＡＳＵＲＥＭＥＮＴ　ＯＦ　ＥＲＢＩＵＭＳＵＢＳＴＩＴＵＴＥＣＡＬＩＢＲＡＴＩＯＮＡＰＰＬＩＥＤＴＯＩＳＯＴＯＰＩＣＲＡＴＩＯＭＥＡＳＵＲＥＭＥＮＴＯ...     

STUDY OF ACTIVE MATERIALS FOR THE RARE EARTH ION SELECTIVE ELECTRODES

The research work on preparation process of active materials of the rare earth ion selective electrodes and the valence of the electrode membrane were reported. The active materials were characterized by infrared spectrum, elemental analysis and XPS.We had studied the rare earth ion selective electrodes in which the active materials consist of functional polymers[1-3]. In this paper, the research work on preparation process and the valence of the electrode membrane were reported, which has not been seen in literature yet.     

POLYMER-SUPPORTED RARE EARTH CATALYSTS FOR STYRENE POLYMERIZATION

The neodymium complex supported on styrene-maleic anhydride copolymer (SMA·Nd) has been prepared for the first time and found to be a highly effective catalyst for the polymerization of styrene. The SMA·Nd polymeric complex is characterized by IR and its catalytic activity, and the polymerization features have been investigated in comparison with that of the conventional Ziegler-Natta catalysts. When [Nd]=1×10~(-3) mol/L, [M]=5mol/L, Al/Nd=170(mol ratio) and CCl_4/Nd=50(mol ratio), the polymerization conversion of styrene gets to 51.6% in six hours, and the catalytic activity reaches 1852 gPS/gNd, which is much higher than that of conventional rare earth catalysts. The polymerization reaction has an induction period and shows some characteristics of chain polymerization. The polymerization rate is the first order with respect to the concentration of styrene monomer. Addition of FeCl_3 does not suppress the polymerization.     

TO GIVE FULL DEVELOPMENT TO CHINA''''S RARE EARTH INDUSTRY FOR THE FOUR MODERNIZATIONS

The initial issue of the Journal of The Chinese Rare Earth Society has been published. The publication of this journal will expedite the development of scientific technology,production and applications of rare earths.It will also promote the academic exchange at home and abroad and give impetus to better understanding and cooperation of the rare     

STUDY OF THE INFLUENCE OF HUMIC SUBSTANCES ON THE SORPTION OF RARE EARTH ELEMENTS AT THE KAOLINITE AND BENTONITE SURFACES

ＳＴＵＤＹＯＦＴＨＥＩＮＦＬＵＥＮＣＥＯＦＨＵＭＩＣＳＵＢＳＴＡＮＣＥＳＯＮＴＨＥＳＯＲＰＴＩＯＮＯＦＲＡＲＥＥＡＲＴＨＥＬＥＭＥＮＴＳＡＴＴＨＥＫＡＯＬＩＮＩＴＥＡＮＤＢＥＮＴＯＮＩＴＥＳＵＲＦＡＣＥＳＤＵＪｉｎｚｈｏｕ；ＹＡＮＧＹｏｎｇｐｉｎｇ；...     

STUDIES ON THE ELECTROANALYTICAL CHEMISTRY OF RARE EARTH ELEMENTS——POLAROGRAPHIC CATALYTIC WAVE OF EUROPIUM-XYLENOL ORANGE SYSTEM

A sensitive catalytic wave of Eu~(3 )-XO in derivative single-sweep polarography is pro-posed. The detective limit is 5×10~(-8)M Eu, and the linear range is 1×10~(-7)M-1×10~(-5)M. The mechanism of this catalytic wave has been studied by several experimental methods.It is proved that the catalytic wave behaves as an adsorptive-complex wave as well as an ECcatalytic wave in which free radical formed by the reduction of XO acts as an oxidizingagent. For this reason, Eu~( 3)-XO is the most sensitive catalytic wave among the rareearths.     

THE COLUMINESCENCE EFFECT OF RARE EARTH COMPLEXES IN LANGMUIR－BLODGETT FILMS

ＴＨＥＣＯＬＵＭＩＮＥＳＣＥＮＣＥＥＦＦＥＣＴＯＦＲＡＲＥＥＡＲＴＨＣＯＭＰＬＥＸＥＳＩＮＬＡＮＧＭＵＩＲ－ＢＬＯＤＧＥＴＴＦＩＬＭＳ￥ＧｕｏＬｕｎＺＨＯＮＧ；ＲｅｎＪｉｅＺＨＡＮＧ；ＫｏｎｇＺｈａｎｇＹＡＮＧ；ａｎｄＧｕｉＹｕｎＺＨＵ（Ｉｎｓｔｉｔ...     

THE QUENCHING OF EXCITED STATES OF HYPOCRELLIN A BY RARE EARTH IONS

The quenching processes of prompt and delayed fluorescence of hypocrellin A by rareearth ions were investigated. It is demonstrated that the prompt fluorescence of HA can bequenched efficiently by RE in methanol via a static quenching process including a groundstate complex formation. The thermally induced delayed fluorescence of HA can also bequenched effectively by complex formed, which quenching is of dynamic quenching behavior.The fluorescence quenching of HA in various micellar systems which protect the quenchingby the compartmentalization of micelles is discussed as well.     

STUDY ON THE BEHAVIOR OF RARE EARTH IONS BY PHOSPHORESCENT PROBE METHOD

ＳＴＵＤＹＯＮＴＨＥＢＥＨＡＶＩＯＲＯＦＲＡＲＥＥＡＲＴＨＩＯＮＳＢＹＰＨＯＳＰＨＯＲＥＳＣＥＮＴＰＲＯＢＥＭＥＴＨＯＤ￥ＧｕｉＢｉｎＭＡ；ＦｅｉＧＡＯ；ＬｉａｎｇＣＨＥＮａｎｄＰｉｎＹＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｓｈａｎｘｉ...     

EFFECT OF RARE EARTH OXIDES ON Ni/Al_2O_3 CATALYST FOR THE STEAM REFORMING OF METHANE

Microreactor-chromatography and XRD technique have been used to investigate the proper-ties of Ni/Al_2O_3 catalyst impregnated with rare earth oxides for the steam reforming of methane.Theresults of the study have shown that the stability of catalytic activity and the ability of resistance to ox-idation of high temperature steam are improved.     

STUDIES ON THE ELECTROANALYTICAL CHEMISTRY OF RARE EARTHS——THE ADSORPTIVE-COMPLEX WAVE OF THE COMPLEXES OF N, N'-DI-(2-HYDROXY-5-SULPHOPHENYL)-C-CYANFORMAZAN (DSPCF) AND LIGHT RARE EARTH ELEMENTS

The sensitive adsorptive-complex wave of the complexes formed by light rare earth elements and DSPCF is studied in this paper. The electroactivities of the complexes of light (La-Eu) and heavy rare earth elements (Gd-Lu), are quite different, so we can determine a certain light rare earth element or the total amounts of light rare earths without separating them from heavy rare earths. The mechanism of the adsorptive-complex wave and the reason why heavy rare earths could not form the electroactive complexes have been studied as well.     

RARE EARTH IONS EXCHANGED HZSM-5 AS SUPPORTS FOR METHANE NON-OXIDATIVE AROMATIZATION CATALYST

Ｔｈｅｄｅｃｌｉｎｉｎｇｃｒｕｄｅｏｉｌｒｅｓｅｒｖｅｓｈａｓｌｅｄｔｏｎａｔｕｒａｌｇａｓｂｅｉｎｇｃｏｎｓｉｄｅｒｅｄａｓａｎａｌｔｅｒｎａｔｉｖｅｓｕｐｐｌｙｔｏｐｒｏｄｕｃｅｉｍｐｏｒｔａｎｔｏｒｇａｎｉｃｒａｗｍａｔｅｒｉａｌｓｓｕｃｈａ...     

NMR AND INFRARED SPECTROSCOPIC STUDY ON THE INTERACTION OF RARE EARTH WITH L-METHIONIHE

Five solid complexes of rare earth with L-methionine have been prepared. The interaction of rare earth with the ligand has been studied by NMR and IR spectroscopy.     

SYNTHESIS AND ANTI－HIV－1 ACTIVITY OF HETEROPOLY COMPLEXES OF TUNGSTOTITANOPHOSPHATES CONTAINING RARE EARTH ELEMENTS

ＳＹＮＴＨＥＳＩＳ　ＡＮＤ　ＡＮＴＩ－ＨＩＶ－１　ＡＣＴＩＶＩＴＹ　ＯＦ　ＨＥＴＥＲＯＰＯＬＹ　ＣＯＭＰＬＥＸＥＳ　ＯＦ　ＴＵＮＧＳＴＯＴＩＴＡＮＯＰＨＯＳＰＨＡＴＥＳ　ＣＯＮＴＡＩＮＩＮＧ　ＲＡＲＥ　ＥＡＲＴＨ　ＥＬＥＭＥＮＴＳＳＹＮＴＨＥＳＩＳＡ...     

THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST

(D, L)-Lactide (LA) was first polymerized with one component of rare earth cata-lysts [Nd(naph)_3, Nd(oct)_3, Nd(O-iPr)3, Nd(AcAc)_3, Y(AcAc)_3, Sm(AcAc)_3, Er(AcAc)_3)]respectively in solution and in melt state. The effects of [Cat]/[LA] molar ratio, solvents,polymerization time, temperature, various rare earth elements and ligands were investi-gated in detail. The results showed that both the conversion of polymerization and themolecular weight (MW) of poly (D, L-Lactide) (PLA) in melt polymerization are higherthan that in solution polymerization, but the polymerization rate in melt was lowr than insolution. The molecular weight distribution (MWD) of PLA is broader with increasing tem-perature. X-ray study indicated that PLA obtained by Nd(AcAc)_3 in melt polymerizationis an amorphous polymer.     

THE PARAMETER KERNELS FOR THE LINEAR INVERSION OF THE FREE OSCILLATION OF THE EARTH (Ⅰ)

In the linear inversion of the radial variation of the parameters of the Earth by usingthe observed frequencies of various normal modes of free oscillation of the earth, it is neces-sary to know the values of the kernels of the parameters ρ, μ and λ. This paper describesthe methods of the derivation of the formulas of these kernels. This is the first part of thepaper in which only the toroidal oscillations are considered. They are much simpler thanthose of the spheroidal ones, that we will consider in the second part of the paper. The data of the two types of oscillations are equally important in the solution of theinversion problem, and should be employed simultaneously, and we know that the toroidaloscillations are much simpler than the spheroidal ones, it seems wise to divide the whole programof the inversion problem into steps: first, by employing the toroidal data to correct the twoparameters ρ and μ in the mantle, then by using the spheroidal data to correct the remain-ing parameters, i.e. th     

THE PARAMETER KERNELS FOR THE LINEAR INVERSION OF THE FREE OSCILLATION OF THE EARTH (Ⅱ)

This is the second instalment of the paper, in which the method of derivation of the for-mulas of parameter kernels for the spheroidal oscillations are considered. The principle ofRayleigh is used to derive the formulas of the kernels of the two elastic parameters, i.e. μand λ. But for that of ρ, it is found very difficult to get satisfactory results. A new butsimpler approach is followed and very satisfactory results are obtained.     

CALCULATION OF THE TRANSITION MATRIX ELEMENTS FOR AN ATOM-DIATOMIC MOLECULE SCATTERING

In this article, the IOS and the GIOS approximate transition matrix elements and theirapplicable conditions, the potential energy condition, mass conditions and kinetic energycondition, have been derived by using the energy shift operator.     

THE DOUBLE POROSITY MODEL FOR MASS TRANSFER BETWEEN CAPILLARIES AND TISSUES IN LUNG MICROCIRCULATION

This paper proposes a double porosity model to deal with the mass transfer between capillaries and tissues in the lung microcirculation on the basis of Ref. [4]. Utilizing the analytic method of small parameter expansion and the numerical method, the nonlinear governing equations are solved. Comparison shows that the small parameter solution is accurate enough to illustrate the mass exchange between the lung capillary and tissues. Finally the results are used to discuss the mechanism of formation of lung edema.