Showing papers by "University of Science and Technology of China published in 1987"
TL;DR: It is shown that below the ''knee'' in the isotherm, however, the peak height in lead stearate decreases slowly with increasing area, implying a first-order melting transition.
Abstract: We have used synchrotron radiation to study organic monolayers on water (''Langmuir films''). At high monolayer pressures, lead stearate (Pb(C/sub 17/H/sub 35/COO)/sub 2/) shows a powder peak at 1.60 A/sup -1/, implying an area per unit cell of 17.8 A/sup 2/ if the lattice is triangular. The correlation length is about 250 A. Lignoceric acid (C/sub 23/H/sub 47/COOH) shows a similar peak even though no heavy ions are attached. When the pressure is reduced, the peak in lead stearate does not observably move or broaden; below the ''knee'' in the isotherm, however, the peak height decreases slowly with increasing area, implying a first-order melting transition.
199 citations
TL;DR: Reduction of the maximal firing rate from 55 to 40 pps showed that although minimization of fatigue at a cost of 10 percent reduction in the maximal force is possible, the correlation of the force response to the input signal remains high and linear.
Abstract: A computer-controlled, dual-channel neuromuscular stimulation system capable of manipulating skeletal muscle force with a wide range of action potential firing rates and motor-unit recruitment control strategies was designed and evaluated on the m. gastrocnemius muscle of the cat. The muscle force could be controlled with control strategies in which motor unit recruitment accounted for from 50 percent and up to 100 percent of the initial muscle force while firing rate induced the remaining force segment. The force response to linearly increasing recruitment was linear, whereas a saturation nonlinearity was evident in response to the firing rate input. Initial and terminal nonlinear force segments during 100 percent recruitment range were shown to be due to the viscoelastic components of the muscle fibers and their tendons. Recruitment of the muscle's motor units at rates that generated from 36 percent/s and up to 360 percent/s of the maximal force range was shown to correlate linearly to the input stimulus (R 0.9889). Reduction of the maximal firing rate from 55 to 40 pps showed that although minimization of fatigue at a cost of 10 percent reduction in the maximal force is possible, the correlation of the force response to the input signal remains high (R 0.9929) and linear. Some preliminary conclusions about rehabilitative applications were drawn based on the data presented in conjunction with previous studies.
88 citations
TL;DR: In this article, a strong patch test is used to establish a general formulation to generate incompatible element functions, and a consistency condition for the incompatible elements is suggested, and then various convergence criteria are obtained naturally.
79 citations
TL;DR: Results for this bonding in Au $T-Al chemical bonding are in good agreement with the arguments presented by Pauling [The Nature of the Chemical Bond, Cornell Univ. Press, Ithaca, NY, 1960), pp. 431-435].
Abstract: We present ${L}_{2}$ and ${L}_{3}$ x-ray absorption spectroscopy measurements on all of the $5d$ transition-metal ($T$) elements and selected $T{\mathrm{Al}}_{2}$ intermetallic compounds. For the $5d$ elements we discuss the general trends in the strength of the near-edge "white-line" (WL) feature, the manifestations of the spin-orbit effects, and the dearth of WL strength for Pt and Au. The changes in the intensity of the $L$-edge WL's in the intermetallic compounds $T{\mathrm{Al}}_{2}$ ($T=\mathrm{Au}\mathrm{and}\mathrm{Pt}$) are discussed in terms of strong $T$-Al chemical bonding. Interestingly, our results for this bonding in Au${\mathrm{Al}}_{2}$ are in good agreement with the arguments presented by Pauling [The Nature of the Chemical Bond (Cornell Univ. Press, Ithaca, NY, 1960), pp. 431-435].
64 citations
TL;DR: In this article, it is proved that the minimum L 1 norm estimator is asymptotically normal under very weak conditions and that the condition imposed on {xi} is exactly the same which ensures the normality of least-squares estimate.
Abstract: Consider the standard linear model where x x ,x 2 … are assumed to be the known p-vectors, β the unknown p-vector of regression coefficients, and e 1 , e 2 , …the independent random error sequence, each having a median zero Define the minimum L 1 norm estimator as,the solution of the minimization problem inf It is proved in this paper that is asymptotically normal under very weak conditions In particular, the condition imposed on {xi} is exactly the same which ensures the asymptotic normality of least-squares estimate:
49 citations
TL;DR: In this article, magnetic susceptibility, Hall effect and superconductivity for single phase Ba 2 YCu 3 O 7− δ oxides are reported, showing that the carriers of the sample are hole-like in normal state and its concentration is about 1.1×10 21 cm -3 at room temperature.
37 citations
TL;DR: In this article, a systematic investigation for the phase properties of squeezed states has been given using a phase operator formalism and exact general results are derived and are used for discussing some special cases.
32 citations
01 Jan 1987
TL;DR: In this paper, the results of some studies of the composition of an aqueous phase in equilibrium with various three-phase assemblages in the system K2O-Al2O3-SiO2 were presented.
Abstract: In this article we present the results of some studies of the composition of an aqueous phase in equilibrium with various three-phase assemblages in the system K2O-Al2O3-SiO2 (figure 1) such as quartz-feldspar-muscovite, muscovite-leucite-corundum, and several others. We interpret the results as indicating that the solutes are dominantly uncharged species, specifically alkali-alumina and alkalialumina- silica species.
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Figure 1
The system K2O-Al2O3-SiO2 and the solid phases used in this study.
31 citations
TL;DR: In this article, a modified Riemann problem in which the initial and boundary conditions are constants is considered for plane waves in a half space occupied by an elastic solid, and wave curves for simple waves and shock waves are used to construct the solution.
31 citations
TL;DR: In this article, the authors studied the relationship between the growth of the means M P (r, ǫ) and M P(r,ǫ), and the multiplicative transformation of ƒ defined by Stoll (J. Math. Anal. Appl., 93 1983, 109, 127) in the bounded symmetric domain of C n.
27 citations
TL;DR: The fresh cross sections of the interface between Mg- or Zn-montmorillonite as a solid electrolyte and V 2 O 5 as a cathode in Mg′V 2 O O 5 and Zn′V O 5 cell have been investigated by SEM and EMP as mentioned in this paper.
TL;DR: In this paper, the photoreflectance spectrum of doping superlattices has mainly first derivative functional lineshapes, which is caused by the subband shift in doping super-attices.
TL;DR: In this paper, the authors give a new proof of the sharp upper bound for the indices of convergence of n x n irreducible Boolean matrices with period p, and characterize the matrix with the largest index.
TL;DR: In this article, it was shown that the sum of the SAFs of the ligands of the lanthanide coordination compounds are mainly in the region SAS = 0.78, σ = σ 0.02 and a standard deviation of 0.015.
TL;DR: In this article, the convergence of the TRUNC element for an arbitrary mesh geometry is proved and the error bounds for both moments and displacements are derived, and it is shown that the new element uses the same finite element space as Zienkiewicz's incompatible cubic element, but its variational formulation is different through the application of numerical integrations to a certain part of the stiffness matrix.
Abstract: The paper establishes a detailed mathematical analysis of the TRUNC element proposed by Bergan et al. [3] and developed further by Argyris et al. [1, 2]. It is shown that the new element uses the same finite element space as Zienkiewicz's incompatible cubic element [4], but its variational formulation is different through the application of numerical integrations to a certain part of the stiffness matrix. The convergence of the TRUNC element for an arbitrary mesh geometry is proved here and the error bounds for both moments and displacements are derived.
TL;DR: In this paper, the fractal-like structures, or irregular holes, appear in silicate film after the crystallization of a-Si when the annealing temperature reaches 400-500 °C.
TL;DR: A stable and reproducible superconductivity transition has been observed through a.c. magnetic susceptibility and electrical resistivity measurements in the (Srx Y1−x)CuO3−Y with x=0.375, 0.4, and 0.5 as discussed by the authors.
TL;DR: A new distributed breadth-first-search algorithm for graphs with worst-case communication and time complexities are both O(|V|2), where |V| is the number of vertices.
TL;DR: The electronic structures of a set of species (BaxY1−x)CuO3 have been investigated by means of X-ray photoelectron spectroscopy as discussed by the authors.
TL;DR: In this article, the intercalation produced by the insertion of Mg2+ into V2O5 was investigated and it was found that there were three phases similar closely to that of Li and one of them was a more stable state.
01 Jan 1987
TL;DR: In this article, the theoretical and observational aspects for the topology of the universe are discussed to show that the significances of topology in present observations can shed some light on the properties of universe in the quantum cosmological era.
Abstract: Topology of the universe is the remains of quantum cosmology. The theoretical and observational aspects for the topology of the universe are discussed to show that the significances of topology of the universe in present observations can shed some light on the properties of the universe in the quantum cosmological era.
TL;DR: In this paper, room temperature photoreflectance was made on a selectively doped GaAs/n-AlxGa1-xAs two-dimensional electron gas grown by molecular beam epitaxy (MBE).
Abstract: Room temperature photoreflectance were made on a selectively doped GaAs/n-AlxGa1-xAs two-dimensional electron gas grown by molecular beam epitaxy (MBE). The lineshapes can be made fit by Aspnes' theory, and the results explained with a simple model.
TL;DR: In this paper, the propagation reaction of 4′-methylenespiro[2-benzofuran]-2,2′-(1,3-dioxolane) initiated by a free radical initiator was studied by analysis of the polymer structure and by kinetic investigation.
Abstract: The propagation reaction of 4′-methylenespiro[2-benzofuran-2,2′-(1,3-dioxolane)] (2), initiated by a free radical initiator, was studied by analysis of the polymer structure and by kinetic investigation. The results indicate that the polymer has the structure of poly [methylene-spiro[2-benzofuran-2,2′-(1,3-dioxolane)]-4′-ylidene-co-(2-oxotrimethylene)] (10). A reasonable propagation mechanism is proposed.
TL;DR: In this paper, a Monte Carlo calculation of slow secondary electrons (SE) was performed with a hybrid model of the exponential decay law and cascade process, where the contributions of both valence electron excitation and core electron excitations were considered.
Abstract: SUMMARY
Monte Carlo calculation of slow secondary electrons (SE) has been performed with a hybrid model of the exponential decay law and cascade process. The contributions of both valence electron excitation and core electron excitation have been considered. The calculated yield, energy distribution, angular distribution and depth distribution for Au, Ag and Cu (28 keV, at normal incidence) are in agreement with the experimental results and better than those previously reported.
TL;DR: In this paper, a microdimension measurement system, using one-dimensional CCD as the sensor, was developed for measuring thin wire or slit, based on Fraunhofer's diffraction.
TL;DR: In this article, two independent and mutually complementary formulae which hold in the regions λ > Λ and λ Λ is a material dependent parameter and its definition will be given in the paper.
TL;DR: In this paper, the specific heat anomaly Δc at 90K (about 3.2% of total specific heat) approximately, due to superconducting transition was measured using non-adiabatic method between 4.2K and 120K.
TL;DR: In this paper, the applicable ranges of one-equation and twoequation turbulence models with the viewpoint of similar theory are discussed, and the criterions of determining the applicable range of these models are given.
Abstract: Here, we are discussing the applicable ranges of one-equation and two-equation turbulence models with the viewpoint of similar theory. The criterions of determining the applicable ranges of these models are given.
01 Jan 1987
TL;DR: In this article, complete samples of galaxies and clusters of galaxies were used to analyze the power indices of the two-point correlation function of galaxy-galaxy and cluster-cluster with power indices about −1.8.
Abstract: Analyses for complete samples of galaxies and clusters of galaxies showed that the two-point correlation function of galaxy-galaxy and cluster- cluster have form of power law with power indices about −1.8 (Peebles, 1980; Bahcall and Soneira, 1983). Because the completeness of a sample means that we have observed completely the objects brighter than a given apparent magnitude in certain sky region. But, we know that a complete sample will be lack of faint objects at distant region. If we attempt to avoid the influences of any non-intrinsic properties on the analysis, we have to use the samples which are complete in certain interval of absolute magnitude.