Showing papers by "Nanjing University published in 1989"
TL;DR: A newly formed northwest-dipping subduction zone during the Sinian-early Paleozoic time was situated on the Shangyu-Zhenghe-Dapu-Lufeng fractural zone to the southeast of the Northwest Fujian terrane as discussed by the authors.
145 citations
TL;DR: Two methods for determination of the acoustic nonlinearity parameter B/A in biological media are presented, including the finite amplitude insert-substitution method (FAIS) and the improved thermodynamic method (ITD), based on the measurement of phase shifts in the acoustic wave due to the change of ambient pressure.
Abstract: Two methods for determination of the acoustic nonlinearity parameter B/A in biological media are presented One is the finite amplitude insert‐substitution method (FAIS), considering the influence of both the sound attenuation of samples and the diffraction of the transducer on the experimental measurement The other is the improved thermodynamic method (ITD), based on the measurement of phase shifts in the acoustic wave due to the change of ambient pressure The nonlinearity parameter B/A has been measured for various biological solutions and soft tissues using these two methods Some results of dependence of B/A values on the concentration and temperature are also presented here
113 citations
TL;DR: The NEJXO with a N.E.-S.W. elongation occurs in the mid-Lower Qigong Group, under which lies the Jiuling Group (1401 Ma) and above which lies Shangshu Group (817 ± 87 Ma).
37 citations
TL;DR: The concept of a caustic is shown to be an excellent way of characterizing SAW focusing by a circular-arc interdigital transducer on YZ-LiNbO/sub 3/.
Abstract: Using the angular spectrum theory and experimental velocity data of surface acoustic waves (SAW) on YZ-LiNbO/sub 3/, the focusing characteristics of a circular-arc interdigital transducer have been demonstrated. The calculated results show that the depth of focus is long and the compressed acoustic beam width is very narrow. The concept of a caustic is shown to be an excellent way of characterizing SAW focusing by a circular-arc interdigital transducer on YZ-LiNbO/sub 3/. Comparison between theoretical and experimental results shows good agreement. >
36 citations
TL;DR: The Huanghe River played a major role in controlling the chenier development by either providing sediment supply or cutting off the supply through shifting of its course as discussed by the authors, which may be used to determine the coastal development and dynamic processes.
36 citations
TL;DR: A new type of superlattice, a Fibonacci acoustic superlATTice, is presented, which is excited by the piezoelectric effect and its ultrasonic spectrum has been studied theoretically and experimentally.
Abstract: A new type of superlattice, a Fibonacci acoustic superlattice, is presented. Its ultrasonic spectrum, which is excited by the piezoelectric effect, has been studied theoretically and experimentally. The results are in good agreement with each other.
31 citations
TL;DR: In this paper, the effects of the pretreatment of copper in benzimidazole solutions on the anodic reactions have been observed by using the infrared reflection-absorption technique and X-ray photoelectron spectroscopy.
28 citations
TL;DR: In this article, the authors measured the internal friction, frequency, electrical resistance and zero point movement of the torsion pendulum in near equi-atomic NiTi alloy in order to clarify the mechanism for the relaxation peak near 200 K.
26 citations
TL;DR: XPS and AES was used to detect phosphorus on electropolished copper obtained using different hydroxyethylidenediphosphonic acid HEDP) concentrations, different pH, and various solutions (H 3 PO 4, HEDPs, and HEDPS+H 3PO 4 ) as mentioned in this paper.
Abstract: XPS and AES was used to detect phosphorus on electropolished copper obtained using different hydroxyethylidenediphosphonic acid HEDP) concentrations, different pH, and various solutions (H 3 PO 4 , HEDP, and HEDP+H 3 PO 4 ). Since no phosphorus was detected on the copper surface, the viscous liquid film that formed could be easily eliminated by washing. The viscous liquid film obtained from the H 3 PO 4 +HEDP solution possesses very good film forming characteristics. The composition of viscous film was established from the constant composition region of the depth profile curve and is considered to be a polynuclear coordination polymeric compound with a structural unit approximately of [Cu 4 (PO 4 ) (HEDP)] n
26 citations
TL;DR: In this paper, the velocity and attenuation versus temperature of ultrasonic longitudinal waves propagating along two directions in the a-b plane at 10° to the a and b axes were measured for a Bi 2 Sr 2 Ca 1 Cu 2 O 8 single crystal.
19 citations
TL;DR: In this article, the authors show the continuity of the feasibility set with respect to the reliability levels and the distribution of the random elements of a stochastic program with probabilistic constraints.
Abstract: In this paper, we show the continuity of the feasibility set with respect to the reliability levels and with respect to the distribution of the random elements of a stochastic program with probabilistic constraints. Continuity is then used to obtain stability results for this type of stochastic program. An easy criterion is given for checking the conditions which guarantee the continuity of the feasibility set.
TL;DR: In this paper, it was shown that a planar homoclinic loop of a nongeneric cubic Hamiltonian has cyclicity two under arbitrary quadratic perturbations.
Abstract: New conditions for a planar homoclinic loop to have cyclicity two under multiple parameter perturbations have been obtained. As an application it is proved that a homoclinic loop of a nongeneric cubic Hamiltonian has cyclicity two under arbitrary quadratic perturbations.
TL;DR: In this paper, X-ray topographic observations showed that three types of dislocations can be observed in a (111) growth sector of a barium nitrate crystal, i.e., edge dislocation with b = 〈110〉, mixed dislocational with b < 0, and screw dislocated with b ≥ 0, which can be distinguished by polarizing microscopy.
TL;DR: In this article, internal friction and elastic modulus on Bi-Sr-Ca-Cu-O system reveal that a certain kind of phase transition take place a few tens degrees higher than Tc.
Abstract: Measurements of internal friction and elastic modulus on Bi–Sr–Ca–Cu–O system reveal that a certain kind of phase transition take place a few tens degrees higher than Tc. X-ray diffraction measurements show that the symmetry remains unchanged from room temperature to 77 K but the lattice parameters jump at the transition temperatures. Ferroelastic loop were measured around the temperatures mentioned above, which indicates the existence of movable boundaries and elastic softening. It is considered that the instability favor the superconducting transition followed.
TL;DR: For a typical anisotropic magnetic superlattice, magnetic polaritons and magnetostatic spin waves in the Voigt geometry are analyzed in the framework of the vector potential representation as discussed by the authors.
Abstract: For a typical anisotropic magnetic superlattice, magnetic polaritons and magnetostatic spin waves in the Voigt geometry are analyzed in the framework of the vector potential representation. Special emphasis is given to the new frequency window of the polaritons characteristic of this anisotropic superlattice. Unique features of the spectra in contrast to those found in usual structures are examined.
TL;DR: In this article, the velocity and attenuation vs temperature of ultrasonic longitudinal wave propagated along two directions in the c-plane at 10° to the a and b axes were measured for a Bi2Sr2CA1Cu2O8 single crystal.
Abstract: The velocity and attenuation vs temperature of ultrasonic longitudinal wave propagated along two directions in the c-plane at 10° to the a and b axes were measured for a Bi2Sr2CA1Cu2O8 single crystal. The anisotropic elasticity in the c-plane is manifested. One direction shows obvious softening minimum around 250 K, the other reveals only monotonic stiffening down to Tc. The origin of the overall trend of elastic stiffening and some discrepancies appearing in the measurements so far for high Tc materials are analyzed or clarified. Attenuation peaks at 95K, 150K, and 250K are attributed to phase-like transition of first order.
TL;DR: In this article, the first single crystal structure of a complex of bis-benzo-15-crown-5 with a rigid meta-phenylene bridge is reported, where the bridging units essentially retain their flat rigid structure in the complex.
TL;DR: In this article, the Monte-Carlo simulation method is used to simulate the growth of the fcc (111) crystal surface, on which emerged the outcrop of a stacking fault bounded by two partial dislocations and a dipole of screw disllocations, respectively.
TL;DR: The Linchang Composite Granite Batholith (LCGB) of west Yunnan is an important constituent of the collision-related granite belt of a Permian-Triassic suture zone in this area.
TL;DR: In this article, the annealing temperature dependence and the composition dependence of phase components were discussed together with the correlation between magnetic properties and the structure of rapidly quenched amorphous alloys.
TL;DR: The propagation and interaction of light in the two-dimensional optical superlattice were investigated by the dynamical theory with the four-wave approximation, which is based on an incident beam that satisfies Bragg conditions in two orthogonal directions.
Abstract: The propagation and interaction of light in the two-dimensional optical superlattice, a two-dimensional periodically modulated medium, were investigated by the dynamical theory with the four-wave approximation, which is based on an incident beam that satisfies Bragg conditions in two orthogonal directions. The excited fields and the intensities of exiting waves in the two-dimensional optical superlattice were calculated. The relation between relative intensities of the exiting waves and angular deviation of the incident beam as well as the index-modulated parameters of the superlattice was obtained. Also discussed are possible applications of the superlattices in optical communications.
TL;DR: In this article, the facile monoalkylation of 2-(P-tolylsulfonyl)acetate under solid-liquid phase transfer conditions is reported. But the facileness of the facili-
TL;DR: In this article, it was shown that the sub-step created on a (111) face of an fcc crystal by stacking fault makes the barrier for the two-dimensional (2D) heterogeneous nucleation on the surface about twice as low as that predicted by Ming et al.
TL;DR: Mise en evidence pour l'oxyde supraconducteur YBa 2 Cu 3 O x avec Fc≃60 K d'une instabilite elastique et/ou d'un transition martensitique pres de 80 K.
Abstract: Mise en evidence pour l'oxyde supraconducteur YBa 2 Cu 3 O x avec Fc≃60 K d'une instabilite elastique et/ou d'une transition martensitique pres de 80 K. On observe toujours un adoucissement de l'elasticite
25 Sep 1989
TL;DR: In this paper, the International Society for Optical Engineering (ISMFE) presented a method for growing organic nonlinear optical crystals. But this method was not suitable for the first assessment of properties.
Abstract: Organic nonlinear optical crystals offer extensive possibilities of materials engineering in many fields of solid state science They exhibit interesting potential uses in optoelectronics In the search for new organic nonlinear optical crystals, solution growth is suitable for rapidly preparing specimens for first assessment of properties Examples of apparatus and procedures for determining the solublilty vs temperature dependence, mapping the primary crystallization range in different solvents, as well as for growing crystals of several selected materials are described© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering Downloading of the abstract is permitted for personal use only
TL;DR: In this paper, a quasilinear second order ordinary differential equation with a small parameter is considered and an appropriate problem is constructed, and an iterative procedure is developed.
Abstract: In this paper we consider a quasilinear second order ordinary differential equation with a small parameter e. Firstly an appropriate problem is constructed. Then an iterative procedure is developed. Finally we give an algorithm whose accuracy is good for arbitrary e>0.
TL;DR: On etudie le mouvement des parois de domaines ferroelectriques dans un cristal TGS dans lequel la transition de phase ordre-desordre ferro-electrique du second ordre prend place a la temperature de Curie as mentioned in this paper.
Abstract: On etudie le mouvement des parois de domaines ferroelectriques dans un cristal TGS dans lequel la transition de phase ordre-desordre ferroelectrique du second ordre prend place a la temperature de Curie
TL;DR: In this paper, a program package is described which can compute ab-initio without the input of any complicated results the characters, subgroup-symmetry adapted projective (both single and double-valued) irreducible representations of the little co-group and the full representation matrices of the space group, the wavevector selection rules, the Clebsch-Gordan (CG) series and CG coefficients in 230 space groups, as well as the characters and irreducer representations and coefficients of the 32 point groups.
TL;DR: In this paper, the title compound (FCVFc) was found to have electrochemical properties of reversible one electron oxidation and two step one electron reduction, and the mechanisms of polymerization in two different potential ranges were proposed.
TL;DR: Two‐dimensional 119Sn exchange spectroscopy was applied to study the hydrolytic kinetics of the hexachloro‐stannate anion, SnCl62− to find the exchange rate constants and hydrolysis equilibrium constants.
Abstract: Two-dimensional 119Sn exchange spectroscopy was applied to study the hydrolytic kinetics of the hexachloro-stannate anion, SnCl62− Two 119Sn exchange spectra for SnCl4 · 5H2O solutions with various HCl concentrations are presented Magnetization exchanges, which are related to the hydrolysis processes, occur in the SnCl62− hydrolysis series The exchange rate constants, the hydrolysis rate constants and the hydrolysis equilibrium constants were evaluated