Showing papers by "Nankai University published in 1995"
76 citations
TL;DR: The results of bioaccumulation of TBT by algae revealed that accumulation through the food chain was very important, and the risk evaluation for humans was made.
59 citations
TL;DR: In this article, the Tchebychev operator has properties similar to the shape operator in Euclidean differential geometry and equiaftine differential geometry, respectively, and is studied.
Abstract: In this paper we study an interesting operator, the Tchebychev operator, which has properties similar to the shape operator in Euclidean differential geometry and equiaftine differential geometry, respectively.
44 citations
TL;DR: Phenolic polymerization was carried out by enzymatic catalysis in organic media, and its kinetics was studied by using high-pressure liquid chromatography (HPLC), and the reaction rate of either the para-substituted substrate or meta- Substantial substrate was higher than that of ortho-substantiated substrate.
Abstract: Phenolic polymerization was carried out by enzymatic catalysis in organic media, and its kinetics was studied by using high-pressure liquid chromatography (HPLC). Phenols and aromatic amines with electron-withdrawing groups could hardly be polymerized by HRP catalysis, but phenols and aromatic amines with electron-donating groups could easily be polymerized. The reaction rate of either the para-substituted substrate or meta-substituted substrate was higher than that of ortho-substituted substrate. When ortho-position of hydroxy group of phenols was occupied by an electron-donating group and if another electron-donating group occupied para-position of hydroxy group, the reaction rate increased. Horseradish peroxidase and lactoperoxidase could easily catalyze the polymerization, but chloroperoxidase and laccase failed to yield polymers. Metallic ions such as Mn2+, Fe2+, or Fe3+, and Cu2+ could poison horseradish peroxidase to various extents, but ions such as Co2+, Cd2+, Zn2+, and K+ were not found to inhibit the reaction. © 1995 John Wiley & Sons, Inc.
38 citations
17 Sep 1995
TL;DR: A new method for proving converses is developed, called "the inherently typical subset lemma", which goes considerably beyond the "entropy characterization" the "image size characterization," and its extensions.
Abstract: A new coding problem is introduced for a correlated source (X/sup n/,Y/sup n/)/sub n=1//sup /spl infin//. The observer of X/sup n/ can transmit data depending on X/sup n/ at a prescribed rate R. Based on these data the observer of Y/sup n/ tries to identify whether for some distortion measure /spl rho/ (like the Hamming distance) n/sup -1/ /spl rho/(X/sup n/,Y/sup n/)/spl les/d, a prescribed fidelity criterion. We investigate as functions of R and d the exponents of two error probabilities, the probabilities for misacceptance, and the probabilities for misrejection. In the case where X/sup n/ and Y/sup n/ are independent, we completely characterize the achievable region for the rate R and the exponents of two error probabilities; in the case where X/sup n/ and Y/sup n/ are correlated, we get some interesting partial results for the achievable region. During the process, we develop a new method for proving converses, which is called "the inherently typical subset lemma". This new method goes considerably beyond the "entropy characterization" the "image size characterization," and its extensions. It is conceivable that this new method has a strong impact on multiuser information theory.
36 citations
TL;DR: The optimal conditions for adsorbing Candida cylindracea lipase (CCL) were studied and some rules were found for the influence of pore structure such as specific surface area, average pore diameter, and pore volume on the immobilization of CCL.
33 citations
TL;DR: It is suggested that SCS is a predictor of symptomatic cerebral infarct in patients with AF and it is thought to be important to diagnose SCS using cranial MRI or computed tomography and to keep patients with SCS under close surveillance.
Abstract: To clarify whether silent cortical strokes (SCS) could be a predictor of symptomatic stroke in patients with atrial fibrillation (AF), 72 patients with AF (50 with chronic AF, 22 with paroxysmal AF) were studied. Patients with mitral stenosis, history of myocardial infarction, or dilated cardiomyopathy were excluded from this study. Using cranial magnetic resonance imaging (MRI), the patients were divided into those with SCS (23 patients, Group 1) and those without SCS (49 patients, Group 2). The incidence of symptomatic stroke was then compared between the two groups. Three patients (13%) in Group 1 developed symptomatic brain infarction; this is statistically significant (p < 0.05), compared with the patients in Group 2, none of whom experienced symptomatic stroke. We suggest that SCS is a predictor of symptomatic cerebral infarct in patients with AF. Therefore, it is thought to be important to diagnose SCS using cranial MRI or computed tomography and to keep patients with SCS under close surveillance.
33 citations
18 Aug 1995
TL;DR: In this article, the threshold effect of incident light intensity for the photorefractive light-induced scattering in LiNbO3:Fe, Mg crystals is reported.
Abstract: In this paper, we report a new effect -- the threshold effect of incident light intensity for the photorefractive light-induced scattering in LiNbO3:Fe, Mg crystals, which could be used as a simple, effective technique to suppress the photorefractively light-induced scattering and is useful for us to get the noise-free photorefractive devices.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
31 citations
TL;DR: A theoretical analysis of beam propagation in thick nonlinear media by using the Gaussian decomposition method and considering a thick medium as a stack of thin media and good agreement is obtained with a distributed-lens model.
Abstract: We present a theoretical analysis of beam propagation in thick nonlinear media by using the Gaussian decomposition method and considering a thick medium as a stack of thin media. Simple analytic solutions of Z-scan characteristics and optical limiting with thick nonlinear media are obtained. Comparisons of these results with those obtained by use of a distributed-lens model and Gaussian–Laguerre mode decomposition are made. Good agreement is obtained with a distributed-lens model.
30 citations
TL;DR: It is shown that during the time evolution, the intrinsic decoherence in the atom-field interaction suppresses these nonclassical behaviors in the JCM.
Abstract: In this paper, we study the multiphoton Jaynes-Cummings model (JCM) governed by the Milburn equation [G. J. Milburn, Phys. Rev. A 44, 5401 (1991); 47, 2415 (1993)], which models the decoherence of a quantum system as the quantum system evolves through intrinsic mechanisms beyond conventional quantum mechanics. We give an exact solution of this equation for the multiphoton Jaynes-Cummings Hamiltonian and apply it to investigate the influence of the intrinsic decoherence on nonclassical effects (atomic inversion, oscillations of the photon-number distribution, squeezing of the cavity field, and photon antibunching) in the JCM. It is shown that during the time evolution, the intrinsic decoherence in the atom-field interaction suppresses these nonclassical behaviors in the JCM.
29 citations
TL;DR: In this paper, the magnetic susceptibility measurements (4.2 −300 K) of Cu(oxap)Gd(phen)2(ClO4)3 indicate a weak ferromagnetic interaction between the copper(II) and gadolinium(III) ions, with the exchange integral JCuGd = 2.25 cm−1.
17 Sep 1995
TL;DR: This work considers the problem of hypothesis testing for AVS in the same way for DMS, and determines the best asymptotic exponent of the second kind of the error probability when the first kind ofThe error probability is (1) fixed (2) less than 2/sup -nr/.
Abstract: The problem of hypothesis testing, which is to decide between two alternative explanations for the observed data, is one of the standard problems in statistics. A discrete memoryless source (DMS) is a sequence of i.i.d random variables. The distribution of the DMS is either P/sub 1/ or P/sub 2/. When a sample is emitted from the source, the observer attempts to decide which hypothesis of H/sub 1/:P/sub 1/ or H/sub 2/:P/sub 2/ is correct. The main concern of this problem is to determine the best asymptotic exponent of the second kind of the error probability when the first kind of the error probability is (1) fixed (2) less than 2/sup -nr/. These are specified by (1) the well-known lemma of Stein (Blahut 1974) the theorem of Hoeffding (1965), Blahut (1974), Csiszar and Longo (1971) for the hypothesis testing problem with exponential-type constraint. DMS is an ideal model. A more robust model is an arbitrarily varying source (AVS), where the source distribution may vary within a certain set of distribution from one time instant to the next. The varying behavior of the distribution of AVS is not known exactly, and there are only two alternatives. We consider the problem of hypothesis testing for AVS in the same way for DMS, and determine the best asymptotic exponent of the second kind of the error probability when the first kind of the error probability is (1) fixed (2) less than 2/sup -nr/.
TL;DR: In this article, the effect of the cathodic current density on the chemical composition, surface morphology of the Ni/Fe/Mo alloys, and current efficiency of the deposition process was determined.
TL;DR: In this article, the application of cyclic voltammetry to biosensor devices based on solid supported bilayer lipid membranes (s-BLMs) for the detection of ligand-receptor contact reaction was investigated.
TL;DR: In this article, the hydrogen storage electrode (MH) has been investigated by a.c. impedance measurements, and the electrode impedance has been measured by superimposing an a.k.a. voltage of 5 mV amplitude ranging between 104 and 10−2 Hz.
TL;DR: An experimental study of holographic recording and signal light amplification through higherorder diffracted waves from holographic gratings recorded in an acceptor-donor-substituted azobenzene-doped poly(methyl methacrylate) thin film is reported.
Abstract: We reported an experimental study of holographic recording and signal light amplification through higher-order diffracted waves from holographic gratings recorded in an acceptor–donor-substituted azobenzene-doped poly(methyl methacrylate) thin film.
TL;DR: Theoretical and experimentally study phase contrast using a photorefractive LiNbO(3):Fe crystal sheet and realize the high-performance phase contrast operation using C-cut LiNBO( 3): Fe crystal sheets in which the photovoltaic effect plays an important role.
Abstract: We theoretically and experimentally study phase contrast using a photorefractive LiNbO3:Fe crystal sheet and realize the high-performance phase contrast operation using C-cut LiNbO3:Fe crystal sheets in which the photovoltaic effect plays an important role. We estimate the maximum photovoltaic field in LiNbO3:Fe using the phase contrast method.
TL;DR: Two hybrid optical/digital systems for access control applications in real-time fingerprint identification are presented, and initial experimental results show that the incoherent system achieves better performance at the expense of additional equipment.
Abstract: Two hybrid optical/digital systems for access control applications in real-time fingerprint identification are presented. Both involve fingerprint acquisition with a prism, optical Fourier transformation by a lens, data reduction using a wedge-ring detector (WRD), and decision making with a digital computer. One, called the coherent system, performs the Fourier transformation on a coherent fingerprint image introduced directly from a prism, and the other, called the incoherent system, acquires an incoherent fingerprint image, performs preprocessing in a digital computer, and incoherent-to-coherent image conversion before coherent processing. Both systems use the total internal reflection obtained in a prism to introduce the fingerprint image. Decision making is performed by a computer on the WRD output, a feature vector of 64 component digital values. In our experiment, discrimination and error-tolerance performance associated with our two access control systems were tested with four different fingerprints. Initial experimental results show that the incoherent system achieves better performance at the expense of additional equipment.
TL;DR: In this paper, the addition of elemental selenium to CO-bridged anions (μ-RS) gave new selenido-branched intermediates, and the structure of the product with R=Ph was confirmed by X-ray crystallography.
TL;DR: In this paper, a simple approach to the synthesis of macrocyclic dioxotetraamine ligands bearing pendent coordinating groups is described, and the ligands can be triprotonated including the phenolate.
TL;DR: In this paper, the surface treatment by HF acid solution was found to significantly improve the electrocatalytic activity and activation behavior of the Zr(V 0.2 Mn 0.6 ) 2.4 alloy electrode.
TL;DR: In this paper, an improved synthetic procedure for pentabenzylcyclopentadiene Bz5C5H was developed and six new organomolybdenum and organotungsten halides were syntesized through the reaction of η5-Bz5c5Mo(CO)3I with PCl3, PBr3 or I2 and characterized by elemental analysis, IR and 1H NMR spectroscopy.
TL;DR: In this article, a novel method of generating optical phase conjugation using an azo-doped liquid crystal valve is proposed for the first time, and its response time, diffraction efficiency, and threshold intensity are measured.
Abstract: A novel method of generating optical phase conjugation using an azo-doped liquid crystal valve is proposed for the first time. Its response time, diffraction efficiency, and threshold intensity are measured. The resolution of the device is discussed. An observation of diffraction rings caused by self-phase modulation when a low-power laser beam passes through the azo-doped liquid crystal valve is reported. Finally, these phenomena are shown to be results of the reorientation of liquid crystal molecules driven by the photoinduced isomerization, not merely an azo dye effect or a local heating effect.
TL;DR: The optimum chromatographic separation conditions for Co(II, Ni(II), and Fe(III) chelates with 2-(2-thiazolylazo)-5-dimethylaminophenol (TAM) were investigated and the possible structure of chelate was given.
TL;DR: In this article, two trinuclear complexes have been synthesized based on IR, elemental analyses, conductivity measurements and electronic spectra, and the complexes are proposed to have extended oxamido-bridged structures.
TL;DR: In this article, fine particles of MmNi5 (Mm: abbreviation for mischmetal) multicomponent hydrogen storage alloys were encapsulated with a thin layer of nickel about 0.5 μm thick using a special chemical plating method.
TL;DR: In this article, a starting configuration of the distribution is generated with randomly positioned Si,Al. After the simulated annealing procedure, some orderings appear in the optimized configurations of the system and lead to a series of consequences.
TL;DR: In this paper, the electrochemical capacities and cycle lives of all the alloys were determined; the influences of nickel content on capacity were also studied; and microencapsulated the alloy powder with nickel or copper.
TL;DR: The authors showed that the geometry about the germanium atom was a distorted trigonal bipyramid and showed that it was possible to obtain good yields of 72 and 94% for the two classes of sesquioxides.
Abstract: The title compounds were prepared by the reaction of germanium sesquioxides with diethyl N,N-bis(2-hydroxyethyl)aminomethylphosphonate in good yields (72–94%). The X-ray analyses showed that the geometry about the germanium atom was a distorted trigonal bipyramid. © John Wiley & Sons, Inc.
TL;DR: Five patients with systemic lupus erythematosus were perfused through an extracorporeal shunt filled with DNA-immunoadsorbent, and the symptoms of patients, i.e., long-term severe joint pain, severe edema, hydropericardium, and ascites were relieved considerably.
Abstract: Five patients with systemic lupus erythematosus (SLE) were perfused through an extracorporeal shunt filled with DNA-immunoadsorbent (DNA immobilized on carbonized resin beads). High concentrations of anti-DNA antibodies (36.4-67.0%) (binding percentage with 125I-DNA) in the serum of SLE patients were reduced to 13.8-53.0%, respectively. The highest removal percentage was 62.1%. Although the decline levels varied, the symptoms of patients, i.e., long-term severe joint pain, severe edema, hydropericardium, and ascites were all relieved considerably. The immunoadsorbent showed satisfactory blood compatibility.