Showing papers by "Nanjing University published in 1986"
TL;DR: The Yellow River is noted for its small water discharge and huge sediment load, which amounts to about11 × 108 tons every year, contributing 17% of the world's fluvial sediment discharge to the ocean as mentioned in this paper.
261 citations
TL;DR: A fermion dynamical symmetry model is presented in this paper, which can account for a multitude of nuclear collective phenomena, such as nuclear singularity and nuclear nuclear nuclear magnetic resonance.
72 citations
TL;DR: The Yalu, Luan, the Yellow, Changjiang and Pearl Rivers discharge 90% of China's total annual input of 2014 × 10 8 t of sediment to the sea as mentioned in this paper.
Abstract: The Yalu, Luan, the Yellow, Changjiang and Pearl Rivers, discharge 90% of China’s total annual input of 2014 × 10 8 t of sediment to the sea This huge volume of sediment is deposited in the river mouths and in the vicinity of the inner shelves in the form of deltas or submarine sandy ridges depending upon the dominant processes or dynamics of the area Even though the continental shelves of the China Seas were coastal plains during the Late Pleistocene, modern river sediments rarely extend to the outer shelves except in response to changes in sea level
59 citations
TL;DR: In this paper, a radiofrequency heated Czochralski technique was used to obtain LiTaO3 crystals with a modulated structure (periodic laminar ferroelectric domains).
42 citations
TL;DR: In this paper, a 1-D quasiperiodic Nb-Cu metallic superlattices have been prepared by magnetron sputtering and the X-ray diffraction pattern may be indexed by the projection method from the high-dimensional periodic structure.
42 citations
TL;DR: First-order correlation functions of the electric field and photon-number probabilities in the case of a three-level atom interacting with two-mode radiation field are obtained and it is found that double stimulation will cause the field to approach its initial coherent state and the oscillation of the photon- number probabilities to collapse and revive.
Abstract: First-order correlation functions of the electric field and photon-number probabilities in the case of a three-level atom interacting with two-mode radiation field are obtained to investigate the coherent properties of the stimulated emission under different initial conditions. It is found that double stimulation will cause the field to approach its initial coherent state and the oscillation of the photon-number probabilities to collapse and revive.
24 citations
01 Jan 1986
24 citations
TL;DR: A fermion dynamical symmetry model is shown to yield the particle-rotor model and the basic features of high-spin physics in this article, which is the basis for our work.
23 citations
TL;DR: In this paper, Fourier transform infrared spectroscopy (FT-IR) was used to study chemical reactions in the epoxy-functional silane hydrolyzate bulk, and the kinetics of these reactions were studied, and relative reaction rates were obtained.
Abstract: Chemical reactions in the epoxy-functional silane hydrolyzate bulk have been studied by Fourier transform infrared spectroscopy (FT-IR). It was found that the silanol group opened the epoxy ring upon heating, concurrently with the silanol condensation. The kinetics of these reactions were studied, and the relative reaction rates were obtained.
21 citations
TL;DR: In this article, the high temperature Morin transition in iridium doped hematite crystals was studied and the strong single-ion anisotropy of Ir 4+ ions was found to be due to strong single ion anisotropic properties.
20 citations
TL;DR: In this article, the behavior of magnetocrystalline anisotropy of Mn ions in a hexaferrite was investigated and it was shown that Mn occupies 12k and 2a sites and noncollinear spin structure occurs when x > 1.0.
TL;DR: In this article, the Staebler-Wronski effect in GD undoped microcrystalline Si:H (μc-Si:H) was investigated and an interpretation based on two phase structure with the contribution of grain boundary defects was discussed.
TL;DR: In this paper, the pyridine side group was found to react with the epoxy group, forming networks which contain pyridone and cyclic amide structures, and this reaction was observed also in the interfacial region of poly(vinylpyridine) and γ-glycidoxypropyltrimethoxysilane hydrolyzate coatings on poly(ethylene terephthalate) fiber substrates.
Abstract: Chemical reactions of poly(vinyl pyridine)s and epoxy compounds were studied both in homogeneous solution and in solid state by Fourier transform infrared spectroscopy and other techniques. The pyridine side group was found to react with the epoxy group, forming networks which contain pyridone and cyclic amide structures. This reaction was observed also in the interfacial region of poly(vinyl pyridine) and γ-glycidoxypropyltrimethoxysilane hydrolyzate coatings on poly(ethylene terephthalate) fiber substrates.
Die Reaktion zwischen Polyvinylpyridinen und Epoxyverbindungen wurde sowohl in homogenen Losungen als auch im festen Zustand mit Hilfe der Fourier-Transform-Infrarotspektroskopie und anderer Techniken untersucht. Es wurde beobachtet, das die Pyridinseitengruppe mit den Epoxygruppen unter Bildung von Netzwerken, die Pyridon- und cyclische Amidstrukturen enthalten, reagiert. Diese Reaktion wurde ebenso in der Grenzflachenregion zwischen Polyvinylpyridin und Uberzugen aus γ-Glycidoxypropyltrimethoxysilanhydrolysat auf Poly(ethylenterephthalat)-Fasern beobachtet.
TL;DR: The experimental results of TGS crystal growth with modulated structure (periodic laminar of ferroelectric domains) is briefly discussed in this paper, where the DL-alanine additive is added to the solution of the TGS and the electric field during crystal growth is periodically varied.
TL;DR: Birefringence images of screw dislocations in gadolinium gallium garnet and yttrium aluminium garnet (YAG) have been studied in detail.
Abstract: Birefringence images of screw dislocations in gadolinium gallium garnet (GGG) and yttrium aluminium garnet (YAG) crystals have been studied in detail and birefringence images of screw dislocations viewed end-on have been observed for the first time. The one-to-one correspondence between birefringence images of screw dislocations viewed end-on and those viewed from the side is demonstrated. The contours of equal intensity for birefringence images of screw dislocation viewed end-on in GGG and YAG crystals are calculated and presented.
TL;DR: In this article, the surface orientation of polyester fibers has been studied by a modified sampling technique using Fourier transform infrared (FT-IR) diffuse reflectance spectroscopy.
Abstract: The surface orientation of polyester fibers has been studied by a modified sampling technique using Fourier transform infrared (FT-IR) diffuse reflectance spectroscopy. The fiber axes were arranged parallel to incident radiation first, and then perpendicular to it. The differences in total absorbance and relative intensity changes in the spectra obtained show the features of specular reflection. The technique has the advantage over ATR that there is no optical contact problem.
TL;DR: In this paper, the catalytic properties of the cumene cracking and o-xylene isomerization on SAPO-5 have been investigated, and compared with those of the AlPO 4 -5 and HZSM-5.
Abstract: The catalytic properties of the cumene cracking and the o-xylene isomerization on SAPO-5 have been investigated, and compared with those of the AlPO 4 -5 and HZSM-5. The catalyst poisoning has been carried out with pyridine. The results show that the SAPO-5 is catalytically active to these reactions while the AlPO 4 -5 is inactive. The hydroxyl groups and their acidic properties of SAPO-5 have been examined by means of IR spectroscopy with the adsorption of D 2 O and pyridine as a probe. Four hydroxyl groups characterized by the bands near 3745, 3677, 3630 and 3520 cm −1 are clearly observed and they are acidic. The experiments also indicate that both of Bronsted and Lewis acid sites are present on the SAPO-5. From TPD data it is found that the HZSM-5 contains two types of acid sites, medium and strong, while the SAPO-5 contains only one type of medium acid sites.
02 Apr 1986-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: Positron annihilation lifetime spectra have been used to study 12 MeV e−irradiated polypropylene No significant change in he intensity of the longest lifetime component has been found with increase in irradiation dose; in the range of 16 Mrad irradiation, the intensity of shortest lifetime component increases while that of the intermediate component decreases as the irradiation dosage increases as mentioned in this paper.
Abstract: Positron annihilation lifetime spectra have been used to study 12 MeV e−-irradiated polypropylene No significant change in he intensity of the longest lifetime component has been found with increase in irradiation dose; in the range of 16 Mrad irradiation dose the intensity of the shortest lifetime component increases while that of the intermediate component decreases as the irradiation dose increases However, for a dose of 32 Mrad the positron annihilation lifetimes are similar to those for the control sample This may be due to the synergistic action of the expansion of the free volumes and the formation of free radicals, as well as to various reactions or phase conversions occurring in the polypropylene during and subsequent to electron irradiation
TL;DR: In this article, the authors examined the real behaviour of solar activity during the period AD 1400-1600 and found that the distributions of the 20 naked-eye sunspot records are inhomogeneous.
Abstract: In this paper we have examined the real behaviour of solar activity during the period AD 1400–1600. The results are as follows: (l)the distributions of the 20 naked-eye sunspot records are inhomogeneous. There are 2 sightings in the 15th century and 18 sightings in the 16th century; (2) the distributions of auroral records are similar to sunspot. There are 33 records in the 15th century and 315 records in the 16th century; (3) the climatic fluctuations in China shows that the period AD 1430–1520 was cold while the period AD 1520–1620 was warm. These facts clearly demonstrate that the Sporer Minimum, if it extended from AD 1460 to 1550, could be a specious results and it, if its extent was AD 1400–1510, is a real feature of solar variability in that time.
TL;DR: In this article, the anomaly of LiNbO3 in the vicinity of 75°C has been studied by various X-ray diffraction methods and an abrupt change of axial ratio (c/a) was measured.
Abstract: The anomaly of LiNbO3 in the vicinity of 75°C has been studied by various X-ray diffraction methods. An abrupt change of axial ratio (c/a) was measured. Internal friction peak associated with this change shows characteristic of first order phase transition. A step-like change in all elastic constant Cij occurs near 75°C.
TL;DR: In this article, the chemical reaction between pyridine and epoxy compounds has been investigated, and a reaction scheme based on spectral studies has been proposed to obtain the order of reactivity for different derivatives.
TL;DR: In this paper, the coordination states of Fe3+, B3+ and Al3+ ions in the alkali-silicate glasses were determined and the structural effects of these cations coexisting in the glass, and the effects of the iron and boric oxide anomaly on glass density, were also analyzed.
Abstract: The coordination states of Fe3+, B3+ and Al3+ ions in the alkali-silicate glasses have been determined. The structural effects of these cations coexisting in the glass, and the effects of the iron and boric oxide anomaly on glass density, are also analysed.
TL;DR: The Kuiqi granite batholith as discussed by the authors outcrops in the vicinity of Fuzhou City, Fujian Province and constitutes one of the typical alkali granitic complexes in the Belt of Miarolitic Granites extending along the southeast coast of China.
Abstract: The Kuiqi granite batholith outcrops in the vicinity of Fuzhou City, Fujian Province and constitutes one of the typical alkali granitic complexes in the “Belt of Miarolitic Granites” extending along the southeast coast of China. The complex is believed to have been emplaced at higher levels of the crust in a tensional fault environment. Petrographically it is composed mainly of aegirine-arfvedsonite granites with early biotite granites scattered. Miarolitic structure and granophyric texture are commonly observed. The Rb-Sr isochron age of the complex is 107.65 m.y. Both petrological and petrochemical studies show that the Kuiqi granite is of A-type. Data on chemical composition, REE pattern and transition elements reveal that there is a close genetic connection between granites and associated volcanic rocks. Thus, syntexistype (I-type) granite, A-type granite and volcanic rocks form a cogenetic “trinity”, in which the A-type granite is usually the latest member of the volcanic-intrusive series.
TL;DR: In this article, a new type of blow up transformation called unitized momentum transformation has been introduced to overcome the difficulty of singularities in the problem of global solution of N-Body Problem.
Abstract: In the qualitative study of N-Body Problem, a new type of blow up transformation called Unitized Momentum Transformation has been introduced to overcome the difficulty of singularities in the problem of global solution. The concepts of total collision manifold defined by McGehee have been extended.
TL;DR: Mossbauer absorption spectroscopy was used to study the behavior of iron in varying concentrations and different reducing conditions in SiO 2 Na 2 OAl 2 O 3 ZnO glass systems as mentioned in this paper.
Abstract: Mossbauer absorption spectroscopy was used to study the behaviour of iron in varying concentrations and different reducing conditions in SiO 2 Na 2 OAl 2 O 3 ZnO glass systems. The results indicate that, for the glasses studied, the ferrous and ferric cations are in both tetrahedral and octahedral coordination in the matrix. The ratio of the number of Fe 2+ ions in tetrahedral to the total number of Fe 2+ ions is approximately constant to 0.6, and this ratio, similar to Fe 3+ ions, is not composition-dependent. In addition, the line width is not affected by varying iron content and reducing condition of the glass. Ferric iron is prodominantly octahedrally coordinated when the iron concentration is low. The results of Mossbauer analysis above are also well consistent with the ones of wet chemical analysis, which is greatly different from some results studied before.
01 Apr 1986
TL;DR: In this article, the lattice-structured adaptive noise canceller has been studied and a brief formula about the relation of its misadjustment to the step size and the number of stages has been found theoretically and checked experimentally.
Abstract: The lattice-structured adaptive noise canceller has been studied: a brief formula about the relation of its misadjustment to the step size and the number of stages has been found theoretically and checked experimentally, showing that the misadjustment increases exponentially with the number of stages, an optimized step size has been applied to multi-stage lattice filter, with drastic reduction in convergence time.
TL;DR: In this article, Fourier transform infrared (IR) diffuse reflectance optics have been applied to study molecular orientation of the surfaces of nylon, glass fibers and needle-like organic crystals.
TL;DR: Mossbauer spectroscopy is a dynamic field with applications ranging from physics to biology as mentioned in this paper, and about thirty groups are distributed all over China for both fundamental and practical aspects.
Abstract: Mossbauer spectroscopy is a dynamic field with applications ranging from physics to biology. This paper gives a review of Mossbauer spectroscopy activities carried out by different groups in China. About thirty groups are distributed all over China for both fundamental and practical aspects. In-beam Mossbauer setup was established at HIRAC accelerator in Lanzhou, and the nuclear scattering facility has already been planned at Shanghai Synchrotron Radiation Light Source. In this review, some recent developments and achievements are discussed, as examples: (1) Brownian motion in anisotropic media, (2) applications to archaeology, and (3) molecule-based magnetic materials.
TL;DR: In this article, the etching mechanism of polyimide films on silicon chips has been studied, where the polyion coils are expanded by electrostatic repulsion and the remaining gel contains 10% of original imide bonds and has a molecular weight of 12,000.
Abstract: The etching mechanism of polyimide films on silicon chips has been studied. As the film contacts with alkaline solution, the imide bonds hydrolyze quickly, resulting in the formation of polyions. The polyion coils are expanded by electrostatic repulsion. Within the etching time, most part of the polyimide dissolves into solution. The remaining gel contains 10% of original imide bonds and has a molecular weight of 12,000. The gel is not a classical one, but a physical gel which contains relatively small polymer molecules jointed by secondary forces.