Showing papers by "Wuhan University published in 1993"
TL;DR: The classical theory of elasticity describing three- and lower-dimensional systems is generalized to higher-dimensional spaces and the elastic properties of quasicrystals can be derived from this theory, appropriately.
Abstract: The classical theory of elasticity describing three- and lower-dimensional systems is generalized to higher-dimensional spaces. The elastic properties of quasicrystals can be derived from this theory, appropriately. The practical application is given to pentagonal, octagonal, dodecagonal, and icosahedral quasicrystals. The explicit form is obtained for all elastic equations including Hooke's law, equilibrium equation, etc., in all the cases mentioned above.
279 citations
TL;DR: Synthesis of Thermal Phase Separation Reactive Polymers and their Applications in Immobilized Enzymes as discussed by the authors is a well-known technique for separating reactive polymers and reactive enzymes.
Abstract: Synthesis of Thermal Phase Separating Reactive Polymers and Their Applications in Immobilized Enzymes
101 citations
TL;DR: In this article, the effect of the preparation temperature (T p ) on the gelation of xanthan-locust bean gum (LBG) mixtures has been investigated and it has been observed that gelation occurs at all T p, even when T p T m. At a given ionic strength, increasing T p leads to an increase in the measured storage modulus.
77 citations
TL;DR: With group-representation theory all quadratic invariants and the expressions of elastic energy have been derived for quasicrystals with cubic point-group symmetry and the generalized Hooke's law and equilibrium for cubic quasICrystals are obtained.
Abstract: With group-representation theory all quadratic invariants and the expressions of elastic energy have been derived for quasicrystals with cubic point-group symmetry Using the generalized elasticity theory of quasicrystals, we have also obtained the expressions of the generalized Hooke's law and equilibrium for cubic quasicrystals
58 citations
TL;DR: This paper considers parallelism across time, explores a proposal made in an earlier paper [2], and reports on some tests made on that method.
35 citations
TL;DR: A carbon fibre microelectrode was modified by electrodeposition of a thin copper-heptacyanonitrosylferrate (CuHNF) film on its surface that showed the ability to catalyse electrochemical oxidation of ascorbic acid.
31 citations
TL;DR: Dislocations in an Al62Cu25.5Fe12.5 face-centered icosahedral quasicrystal were studied by means of the contrast experiment and defocus convergent-beam electron diffraction technique to determine the indices of the six-dimensional Burgers vector of the dislocations.
Abstract: Dislocations in an Al62Cu25.5Fe12.5 face-centered icosahedral quasicrystal were studied by means of the contrast experiment and defocus convergent-beam electron diffraction technique. The indices of the six-dimensional Burgers vector of the dislocations were determined to be 1/2[1-11-100]. The projection b(parallel-to) of this six-dimensional Burgers vector in the three-dimensional physical space is exactly parallel to a twofold axis of the icosahedron. The magnitude \b(parallel-to)\ = 0.291 nm was calculated when a = 0.896 nm is taken for the lattice constant of the face-centered icosahedral phase.
26 citations
TL;DR: In this article, a novel inorganic film modified electrodes have been prepared by electrodeposition of a thin copper-heptacyanonitrosylferrate (CuHNF) film on electrode surfaces.
24 citations
TL;DR: A modified nickel hexacyanoferrate film glassy carbon electrode is prepared by the electrochemical deposition technique as mentioned in this paper, which is very stable upon voltammetric scanning in the potential range of 1.0 to −0.5 V and an oxidation peak occurs at 0.35 V (vs. SCE) (1 mol/l NaNO3).
Abstract: A modified nickel hexacyanoferrate film glassy carbon electrode is prepared by the electrochemical deposition technique. The film is very stable upon voltammetric scanning in the potential range of 1.0 to −0.5 V (vs. SCE) and an oxidation peak occurs at 0.35 V (vs. SCE) (1 mol/l NaNO3). The effects of electrolyte, solvent, coexisting ions and other variables on the voltammetric behaviour of the modified film have been studied. The thickness of the resulting film can be controlled by changing the number of voltammetric cycles and the concentrations of nickel(II) and hexacyanoferrate(III) ions. The film shows catalytic activity towards electrooxidation of thiosulfate with a peak potential +0.5 V (K−-containing media). This oxidation potential of thiosulfate on the modified electrode is shifted negatively by about 550 mV as compared to the naked glassy carbon electrode. For practical application, the modified electrode can be used for the determination of thiosulfate in concentrations from 5.0×10−5 to 1.0×10−1 mol/l. This method has been successfully applied to the determination of thiosulfate in photographic waste effluents.
23 citations
TL;DR: In this paper, a Palladium/Carbon catalyst was prepared by the reduction of PdI 2 which was precipitated on the surface of activated carbon, and the effects of preadsorption of different halogen ions and reduction of temperature on Pd particle size and the crystal structure were studied by transmission electron microscopy and selected area diffraction (SAD) methods.
TL;DR: In this article, the edge dislocations in the Al-Pd-Mn icosahedral phase have been first studied by electron diffraction contrast analysis and convergent-beam electron difforescence (CBED).
Abstract: Edge dislocations in the Al-Pd-Mn icosahedral phase have been first studied by electron diffraction contrast analysis and convergent-beam electron diffraction (CBED). Because of the severe residual...
TL;DR: In this article, the relationship between the flowability of ground powders and particle shape was investigated, and the effect of the particle shape on the surface roughness of particles was studied.
Abstract: It is empirically known that the flowability of ground powders varies with the types of mill. In this study, five kinds of test powders of the same size made from the same raw material were prepared by five different types of mills and classifiers. The flowability of these powders was measured and the difference between each result identified. Then, the relationship between the flowability of the powder and particle shape was investigated. The circularity, Wadell's working sphericity, the fractal dimension of particle perimeters and the specific surface area ratio of the test powders were measured, and the effect of the particle shape on the flowability index was studied. The result was that the particle shape, especially the surface roughness of particles, had a very great effect on the flowability of the powders produced in different types of mill.
TL;DR: In this paper, the electrocatalysis of three water-soluble porphyrins (tetrakis (4-trimethylammoniumphenyl) porphrin (H 2 TMAP) and its cobalt complex (CoTMAP) for the electro-oxidation of some small molecules is reported.
19 Oct 1993
TL;DR: This paper focuses on applying the probabilistic model into the full-text retrieval system and shows how this model can be implemented on a small scale trial basis in indexing retrieval systems.
Abstract: Full-text retrieval has the advantages of searching documents over a wide range of words and accessing original text directly. However, because of the inadequate processing speed and insufficient memory capacity, there has been little work done on full text retrieval systems in the past. With the emergence of very large capacity compact disk ROM (CD ROM), research in full-text retrieval systems is becoming increasingly important. Practical systems based on Boolean retrieval models have appeared. However, in spite of its ability to process structured queries, the Boolean model has been criticised for its inability to provide ranked output as all retrieved documents are considered equally important. Probabilistic models have been proposed by some scholars to solve this problem and have successfully been implemented on a small scale trial basis in indexing retrieval systems. This paper focuses on applying the probabilistic model into the full-text retrieval system. >
TL;DR: The preliminary results show that, when measuring the serum antibody response to SjAg in female mice over 10 weeks, the polyphosphate (I) exhibited strong adjuvant activity.
Abstract: New biodegradable and biocompatible polyphosphate based on L-Tyr–L-Tyr or L-Ser–L-Tyr dipeptide as the recurring units were synthesized One of these polyphosphates was chosen for the study of adjuvanticity in conjunction with the soluble antigen extracted from adult Schistosoma japonicum (SjAg) The preliminary results show that, when measuring the serum antibody response to SjAg in female mice over 10 weeks, the polyphosphate (I) exhibited strong adjuvant activity
TL;DR: In this paper, a general formula to define the onset wind velocity for 2-D coupled galloping oscillations of tower buildings with square section is presented, and several important conclusions are obtained, such as: if the two fundamental natural frequencies of a tower building in two mutually orthogonal horizontal principal axes are the same, galloping may take place in the two axial directions at the same time.
TL;DR: In this article, the metabolic thermograms and heat output of mitochondria isolated from musculus liver tissue have been determined by using an LKB 2277 bioactivity monitor; the recovery rate constant k 1 (of the activity recovery phase) and the decline rate constant K 2 (of activity decline phase) have been calculated.
TL;DR: A desolavation device was connected to a microcolumn (40 mm × 3.0 mm i.d.) in which 8-hydroxyquinoline-5-sulphonic acid was immobilized on the substrate of active carbon-silica gel.
TL;DR: In this article, the secondary structure of Turnip Mosaic virus (TuMV) coat protein was studied using both normal Raman spectroscopy (NRS) and surface enhanced Raman Spectrography (SERS).
TL;DR: In this paper, surface-enhanced resonance Raman scattering (SERRS) spectra of α,β,γ,δ-tetra-(4-trimethyl ammonium phenyl) porphyrin [T(4-TAP)P] were obtained.
Abstract: In the present study, surface-enhanced resonance Raman scattering (SERRS) spectra of α,β,γ,δ-tetra-(4-trimethyl ammonium phenyl) porphyrin [T(4-TAP)P] were obtained. With increasing pH, the relative intensities of the bands at 890 and 1244 cm−1 decreased. These bands were attributed to γ(C-H) and δ(Cm-phenyl), respectively. The bands at 420 and 576 cm−1, which were assigned to γ(phenyl-ring), were enhanced. The molecular symmetry of T(4-TAP)P is discussed in terms of group theory. The bands at 1554 and 1496 cm−1 could be attributed to the vibrational modes of the porphyrin macrocycle; the bands at 1460, 1362, and 1330 cm−1 were assigned to v(C-C) + δ(C-H), v(C-N) + δ(C-H), and v(C-N), respectively. All these bands change in band intensities, positions and widths, with the potential changing from +0.2 V to −0.2 V. It was concluded that the adsorbed porphyrins underwent partial incorporation with Ag from the electrode, and the adsorbate assumed a flat orientation on the silver electrode as well as the Ag colloid surface.
TL;DR: It is proved that the structures with k\ensuremath{\le}5 are quasiperiodic, and the projection method can be applied to deal with the pattern and indexing problem of its x-ray-diffraction spectrum.
Abstract: A one-dimensional k-component Fibonacci structure, with k different intervals, is the natural extension of the standard Fibonacci structure with two intervals. We prove that the structures with k\ensuremath{\le}5 are quasiperiodic, and the projection method can be applied to deal with the pattern and indexing problem of its x-ray-diffraction spectrum. For kg5, the resulting structures are no longer quasiperiodic, but they are still ordering. The analytically obtained results have been compared to experimental results for Ta-Al three-component Fibonacci superlattice structures and to numerical calculations.
TL;DR: The phase recognition mechanism of nine groups of position isomers on four crown ether polysiloxanes, OV-1701 and PEG 20M has been investigated by measuring various thermodynamic parameters as mentioned in this paper.
Abstract: The phase recognition mechanism of nine groups of position isomers on four crown ether polysiloxanes, OV-1701 and PEG 20M has been investigsated by measuring various thermodynamic parameters. The high selectivity of crown ether polysiloxane phases is due to hydrogen bonding and the extent of fitting between the analytes and the crown ethe cavity. The effects on selectivity of cavity size, heteroatoms and substituent groups on the crown ether are discussed.
TL;DR: In this article, a combined sensing system has been designed for the simultaneous measurement of oxygen and carbon dioxide, featuring a low temperature coefficient, good linearity and relatively fast response, which can be used for a variety of applications.
Abstract: Important problems for amperometric non-aqueous CO 2 sensors of microelectrode type have been studied, including electrocatalysis, temperature coefficient, oxygen interference and its removal. Based on these studies, a combined sensing system has been designed for the simultaneous measurement of oxygen and carbon dioxide, featuring a low temperature coefficient, good linearity and relatively fast response.
TL;DR: In this article, a large-angle convergent-beam electron diffraction (LACBED) was used to determine dislocations and dislocation pairs in the Al70Co15Ni15 decagonal phase.
Abstract: By means of high-temperature deformation, stacking faults, dislocations and dislocation pairs have been induced abundantly in the Al70Co15Ni15 decagonal phase. Burgers vector b , their directions, their senses and their magnitudes, of dislocations were determined by large-angle convergent-beam electron diffraction (LACBED). Moreover, three kinds of small-angle grain boundaries (SAGBs) were observed in an annealed Al70Co15Ni15 decagonal phase: (1) a tilt boundary consisting of an edge dislocation wall; (2) a twist boundary consisting of parallel screw dislocation pairs; and (3) a small-angle grain boundary consisting of a mixed dislocation network.
TL;DR: A piezoelectric crystal immunosensor for the detection of bovine haemoglobin has been developed in this paper, where the immobilizing process was monitored by determining the frequency shift of a quartz crystal microbalance (QCM).
Abstract: A piezoelectric crystal immunosensor for the detection of bovine haemoglobin has been developed The immobilizing process was monitored by determining the frequency shift of a quartz crystal microbalance (QCM) Bovine haemoglobin concentrations in the range of 0001 to 01 mg/ml could be detected by the system The influence of the liquid depth on the frequency of QCM was discussed The interference of bovine serum albumin was also studied
TL;DR: The most effective procedure for inducing triploidy was the treatment of eggs at 200–250 kg/cm and insemination for 10 min duration, which resulted in 76% triploids embryos, and high hatchability was also obtained.
TL;DR: Sealed minicells for microelectrode and spectroelectrochemical investigation of liquid cathode depolarizers of lithium batteries were developed in this article, and the applicability of these technique is illustrated with the results of the Li/SOCl2 and Li/ SO2Cl2 systems studies using these techniques.
01 Jan 1993
TL;DR: In this article, the authors investigated the effect of artificial ice coating on the dielectric strength of high voltage insulator string and found that the dielection strength drops greatly because of ice coating, and the outages due to flashover of ice coated insulators are frequently reported in many countries.
Abstract: The dielectric strength of high voltage insulator string drops greatly because of ice coating. The outages on HV transmission lines due to flashover of ice coated insulators are frequently reported in many countries. This paper gives information of investigation in icing on insulators in icing regions of China, and results of artificial ice coating and discharge tests on HV line insulator strings. On the basis of these, some views on the types and forming process of icing on insulators, flashover process and discharge voltage performance of ice coated insulator string are provided.
TL;DR: In this article, the three-gluon condensates at finite temperature were investigated in the framework of the grand partition function for a dilute instanton medium at finite (low) temperature, and found to decrease slowly with the temperature.
Abstract: The three-gluon condensates at finite temperature are found to be of two types. It turns out that these two types of gluon condensates differ only in sign. The value of these condensates is investigated in the framework of the grand partition function for a dilute instanton medium at finite (low) temperature, and found to decrease slowly with the temperature even for very low temperature and vanish nearly atT=240 MeV.