Showing papers in "Wuhan University Journal in 2003"

Structures and Properties of Chitosan-Starch-Sodium Benzoate Blend Films

Abstract: The chitosan-starch-sodium benzoate blend films were prepared by solution method, and then characterized by FT-IR, XRD, transmittancy, percent water absorption, measurement of mechanical properties and antimicrobial activity. The results suggested that there was some strong interaction and good compatibility in the blend films. The starch content in the blend films can improve the mechanical properties of them, the tensile strength values increased by 31.9% in dry state and 26.4% in wet state when the chitosan content was 60%. The antimicrobial activity of blend films increased as sodium benzoate was added to the films, In one week, the antimicrobial activity against St.aureus and E.coli of the blend films increased by 10.4% and 31.2% each when the chitosan content was 80%.

Analysis of Water Environment Characteristics and Purification Ability of Honghu Lake Wetland in Jianghan Plain

Abstract: Based on the monitoring data of water quality in Honghu Lake wetland, this paper analyzed the current situation of water environment in Honghu Lake The research results indicated that the water quality of Honghu Lake keep in good state according to the criterion of grade of surface water Owing to the frequent water exchange and growing hydrophytes, these provide the good condition of increasing the capacity of water dilution and purification and digesting the pollutant

Antimicrobial Activity of Chitosan in Combination with Thymol

Abstract: The minimum inhibitory concentration(MIC) of chitosan, thymol and their complexes were evaluated against Staphylococcua aureus, Staphylococcua epidermis, Corynebact xerosics, Escherichia coli, Bacterium aeruginosa and Candida albicans. The effect of conditions such as concentration, pH value, emulsion were also studied. Results showed that, the complex 0.5 g/L chitosan and 0.125 g/L thymol could inhibit growth of all the tested microorganisms, and the inhibitory time of the complex is longer than that of chitosan and thymol. These resluts demonstrated that the complexes of chitosan and thymol significantly impoved the antimicrobial activity. The effect of conditions indicated that the complexes of 0.5 g/L chitosan and 0.125 g/L or 0.25 g/L thymol inhibited growth of all the microorganisms tested for a longer time. The complexes of chitosan and thymol had stronger inhibitory effects normally in weak acid condition. Inhibitory effects of thymol emulsion made by adding tween-80 and the complexes of chitosan and thymol emulsion were better than those made by adding span-20.

Quick Trickle Permutation

Abstract: In this paper, several characteristics of quick trickle permutation is introduced A method for constructing new quick trickle permutations from given one via conjugate transformation is shown The number of quick trickle permutation which order is less than 17 is given

An Improved Edge Detection Algorithm of SAR Images

Abstract: Ratio edge detector for SAR images can provide high overall edge\|detection probability. But it has defects on the accuracy of edge\|position determination. This paper works deeply on how to determinate the threshold of Ratio edge detector. Then we present a new detector aiming at detecting “weak” edges with threshold of it. A new combined algorithm including both of the two detectors is presented. Its processing results of actual SAR images show wonderful edge\|detection performance and high accuracy of edge\|position determination.

Investigation on the Pattern for Construction of Reusable Test Cases in Object-Oriented Software

Abstract: Reuse as one of the targets in software development can alter the current situation of low development efficiency and poor reliability in the production of software The reusable test can similarly resolve the problems arising from the repeated development in the process of using reuse and so as to advance the applications of reuse in the software development process In this paper, at first, we analyze the common characteristics of test cases, and then, divide them into two classes: state inspection test cases and state comparison test cases based on their designing methods And after that, we get a detail description of the two classes And we provide a theoretical model for generating and executing pattern, and make the test cases being independent of the software to be tested and reach the testing reuse target

The Real-Time DSP System Design of the Ionospheric Oblique Backscattering Sounding System

Abstract: s: Develop a real\|time synchronous DSP scheme which is used in the Ionospheric Oblique Backscattering Sounding System(IOBSS)IOBSS adopts discontinous wave mechanism and has no blind areaIt runs well in experienceCompared with the STUDIO system,IOBSS has better precision,higher speed and greater sounding distanceAnd more,IOBSS has adopted more software components which make it much more adaptable

Synthesis of Tris(Trimethyl Siloxy) Methacryloxypropylsilane

Abstract: Three methods have been established for the synthesis of 1,1,1-tris (trimethylsiloxy) methacryloxypropyl silane,which was characterized by ~(1)H NMR spectrum and IR spectrum. Compared with other reported methods, the one-pot method can increase the yield by 10% and decrease the producing costs by 30%. Under conditions of this one-pot method,the yield of the product is over 60% and the purity is over 98%.

Studies on Controlled Release of Protein Drugs from Chitosan Nanoparticles with Low Molecular Weight

Abstract: Chitosan nanoparticles have promising potential application for the administration of therapeutic protein, gene and antigens by various routes. The preparation of chitosan nanoparticles of low molecular weight, based on ionic crosslinking process of chitosan with polyanion sodium tripolyphosphate(TPP), was performed, which was under a certain concentration and volume ratio and extremely mild condition at room temperature. The morphological examination was performed by transmission electron microscopy (TEM), FT-IR and X-ray diffraction pattern to characterize the structure of the nanoparticles. The effects of adding PEG in crosslinking medium on the size, encapsulating, loading and release properties of nanoparticles were studied. The results indicate that the nanoparticles have a high BSA encapsulation efficiency, which is about 90%, and provides a slow continuous release for the entrapped protein using bovine serum albumin (BSA) as a model protein drug. BSA release is up to 8 days in pH 7.4 phosphate buffer saline. Chitosan nanoparticles with low and high molecular weight are about 20 nm and 210 nm in size, 91.1% and 93.2% in encapsulation efficiency of BSA, 73.9% and 17.6% in total release percent in 8 days respectively. Adding PEG decreases encapsulation efficiency of BSA and accelerates release rate.

Fluorescent Receptor Containing Diaminothiourea Branches: Synthesis and Anion Recognition

Abstract: A novel fluorescent receptor was synthesized and characterized by ~1H NMR,MS,IR and Element Analysis. The binding properties for anions were studied by fluorescent titration method. The results show that the fluorescent receptor has a high selectivity and fluorescence responsibility to AcO~-. (It's) binding abilities to several anions follow the order: AcO~-p-NO_2C_6H_4OPO~(2-)_3,H_2PO~-_4Cl~-.

Effect of Molecular Structure on Moisture Absorption and Retention Capacity of 2-Hydroxypropyltrimethyl Ammonium Chloride Chitosan

Abstract: A series of 2-Hydroxypropyltrimethyl Ammonium Chloride Chitosan(HACC) with different degree of quaternarization and molecular weight were prepared Molecular weight and structure of HACC was characterized by gel permeation chromatography, infrared spectrum and 13C NMR The moisture absorption and moisture retention properties of HACC were found similar to those of hyaluronic acid The moisture absorbability increased with decreasing in molecular weight and moisture retention capacity increased with increasing in molecular weight The moisture absorption and moisture retention ability decreased when degree of quaternarization was less than 43%

The Fractal Dimension of Shanghai Stock Market Based on RBF Neural Networks

Abstract: This paper tests the fractal dimension of Shanghai stock market through the neural networks from the point view of forecasting. Through a data experiment of radial basis function neural network, we find that the optimal embedding dimension is 6. As a result the fractal dimension of Shanghai stock market is about in the interval between 2 and 3. Therefore, the stock market is a chaotic system, and we must take the nonlinear analytical instruments. Finally, we discuss the effect and the reliability of the stock prediction based on chaotic characteristic.

Jing-Chu Culture: Essential Spirit and Features

Abstract: The Jing-Chu culture mostly covers today's middle reaches of Yangtze River in territory. It was considered as the representative of South Culture in the Chinese ancient culture, and attracted world attention for occupying the advanced position in the Chinese modern culture. This essay makes a thorough inquiry into the essential spirit and features of this culture. According to the author, The opening, compatibility, enterprising spirit, together with the characteristic of romance and multiplex value orienting constitute the essential spirit and features of the Jing-Chu culture.

Data Reduction Based on DSM

Abstract: By defining the significance and the uniformity of the attributes, and analyzing the elements md ij s ij in DSM, the important principle of the optimization knowledge reduction and a new data reduction method are put forwardThe method can reduce the superfluous data while preserving the consistency of classifications This data reduction method based on DSM is employed to analyze databases from UCI reposity Through comparing the reducing result of DSM method and Rough set theory method, it show that DSM method can obtain higher reduction rate of instances The DSM method is effective in reducing information systems with its higher validity by using leave-one-out' to examine

Current Status and Prospect of Nano Absorbing Materials

Abstract: The absorbing properties and mechanism of nano absorbing materials are summarized in this paper. The current status and future trend of the nano absorbing materials, including nano metal-alloy absorbing materials, nano ceramic absorbing materials, nano oxide absorbing materials, nano composite absorbing materials and transition metal sulfide nano absorbing materials are introduced. It is presented that the nano composite absorbing materials is the future research tendency of nano absorbing materials.

The Basic Concepts and Existence of Birth and Death Process in Random Environment

Abstract: We introduce the concepts of random transition matrix, random density matrix and Markov process in random environment, especially, random birth and death q \|matrix and birth and death process in random environment in this paper. Finally, we prove the existence of birth and death process in random environment.

The Model of Firewall Based on the Principle of Immunology

Abstract: A new model of firewall according to Computer Immunology is presented.The structure of this model includes two layers. The traditional techology of firewall is used in the first layer.The second layer is based on the principle of Computer Immunology. The rule tree detector is used in the second layer,self-studying,producing dynamic rule and solving the flaw of the first layer in self-adaptation way.The rule tree detector is evolved by GA and GP.The new model of firewall has the characters of self-adaptation and dynamic.

Comparison of Genetic Differences in Groups of Amygdalus persica Revealed by RAPD

Abstract: accessions in Amygdalus were studied by RAPD(random amplified polymorphic DNA) technology, of which the rootstock group and the shouxingtao group, bitao group, weeping peach group, red-leaf peach group, crisp peach group, mitao group, honey peach group, pantao group, nectarine group and yellow peach group(A. persica) were analyzed with polymorphic bands, marker frequency of loci, variant coefficient and correlated coefficient. The results indicated that the shouxingtao group, weeping peach group, red-leaf peach group and bitao group were more original, while the crisp peach group, mitao group, honey peach group, pantao group, nectarine group and yellow peach group more evaluated. As for the genetic diversity, the rootstock group was highest, and the red leaf peach group, mitao group, pantao group and yellow peach group were the next; while the shouxingtao group, bitao group, weeping peach group, crisp peach group and honey peach group were the lowest.

Study on the Gelation of Cationic Guar Gum and Xanthan Gum

Abstract: There are synergistic interactions between the ammonium hydroxy-propyl-trimethyl chloride of the polysaccharide guar gum and xanthan gum which makes them form gels. The effects of the quantitative ratio of them, mixed temperature,incubation time,balk salt ion concentration and pH value on gelation have been studied.It has been observed that there was a gel strength maximum when the quantitative ratio was 20∶80,the mixed temperature was 60℃, the incubation time was 30 min, the salt ion concentration was 1.0 mol·L -1; and the optimal pH value was 7.0. Interation between molecules of these two polysaccharides was investigated by FTIR spectrometry.

The Study on the Three Zoning Treatment Ray Tracing Method and Its Application

Abstract: Starting from the vector ray equation, according to the smoothness of the variation of the refraction angle and the group path of the ray, a ray path is divided into three zones, which are the smooth zone, the minimal dielectric constant zone and the inflexion zone of the changing speed of the dielectric constant Thus the three zoning treatment method is put forward In the case of the smoothness of the ray is destroyed at the inflexion zone and the minimal dielectric constant zone, the special treatment is needed On the basis of existing Vogler HF channel model, one theoretical HF channel simulation and one ray tracing HF channel simulation have been developed During the ray tracing HF channel simulation the three zoning treatment method is adapted to calculate the ray's group delay and incidence angle This model can be applied to the narrow band or wideband HF channel with all kinds of spherically stratified ionospheric profiles and the results' coherence with the Vogler model and merit are described in this paper

On Neural Network Method for Extraction of Blind Signals

Abstract: By using neural network method, under the condition of that some information about rank of the mixture matrix is known, we present a condition of extraction. By using the condition, one can extract some blind signals from the observed signals, when the number of observed signals less than the number of blind signals. A theoretical necessary and sufficient condition of extractability is given. The structure of the neural network and the method of extraction are proposed in detail.

Study on the Dongting Lake's Sedimentation and Flood Disaster Environment Gestation in Decades

Abstract: The evolution of the Dongting Lake affected by both natural process and human activity, and it also influence the eco-environmental safety of the middle Yangtze River region. Sedimentation makes lake change to shallow and capacity decreased. Sediment was recovered by 22 vibrocores in different lake sectors, high sedimentation rates revealed by ~(210)Pb measurement in different subfacies of the lake, the highest up to 2.33 cm/a. primarily due to siltation by Yangtze sediment. In the late 19~(th) century, a major flood induced channel avulsion resulted in the coupling of the Four-Tributary' sub-basin to Dongting Lake, causing a massive increase in sediment supply into the lake since then. Hydrological data demonstrate that about 83% of the lake's annual sediment influx is derived from the Yangtze. In addition, pressures from a growing population and associated human activities, such as reclamation, embanking, aquaculture, forming on slope and deforestation, the Dongting Lake has lost almost two thirds of its total area in the past century, and loss the storage capacity of the Yangtze floods.

An Approximation Algorithm for Genome Rearrangement Problem

Abstract: In the paper we consider the problem of genome rearrangements of the unoriented gene by reversals in molecular biology.It is a NP-hard problem.Based on the concept of a breakpoint graph, we develop an approximation algorithm for problem.The algorithm has an O(max{b~3(π),nb(π)}) time complexity and an O(n) space complexity, where n is the number of genes in genome,π=(π_1,π_2,...,π_n) is a permutation of n genes and b(π) is the number of breakpoints in permutation π.The experiments show that in most cases, our approximation algorithm can find a better solution than the one obtained by the approximation algorithm of Kececioglu and Sankoff.

Analysis of Design for Mixcolumn Transformation of AES

Abstract: The definition of optimal invertible linear transformation is generalized to general field. The theorem of existence for optimal invertible linear transformation over general field, an invertible linear transformation is optimal if and only if every sub-matrix of its corresponding matrix is invertible, is given without any knowledge of code theory. A formula in the algorithm of Sugita, Kobara, Uehara, et al. for computing differential and truncated differential of word-oriented block cipher is simplified. A new property of AES, the system presents the same strength against differential attack when implementing the Mix-column transformation of AES with any optimal invertible circular matrix of suitable size, is found with this simplified formula. The design for Mix-column transformation of AES is reasonable since the Mix-column of AES is optimal invertible linear transformation and the entries (01, 02 and 03) in its corresponding matrix are easy to implement with software or hardware.

Nitrogen Oxides Chemical Sensors

Abstract: This paper aims at reviewing the development of nitrogen oxides(NO x) chemical sensors, which are classified into four main types: surface acoustic wave (SAW) NO x sensors, optical fiber NO x sensors,semiconductor NO x sensors and electrochemical NO x sensors. The emphasis is put on the electrochemical NO x sensors and the feasibility is dicussed for determination of nitrogen oxides using solid polymer electrolyte.

Spectrometric Study on the Interaction of Doxycycline Hyclate and Bovine Serum Albumin

Abstract: The binding characteristics of doxycycline hyclate(DH) and bovine serum albumin have been studied by fluorescence and absorption spectroscopy in aqueous solution The results show that DH has a powerful ability to quench the BSA fluorescence via a nonradiative energy transfer mechanism The fluorescence quenching data were analyzed according to Stern-Volmer equation The binding constant and distance of reaction were obtained From the synchronous spectum to some extent DH has effect on the conformation of BSA

The Breeding of Alkaline Protease High-Yielding Strain

Abstract: By mutagenizing with Co~(60)-γ-rays and subsequent enzyme production condition optimization, a mutant strain Bacillus licheniformis L106 was obtained from B. licheniformis C6. Around 19 000 U/mL of the enzyme productivity could usually be achieved by the strain, which was 1.9 fold higher than that achieved by the strain C6. Compared to the start strain C6, L106 has higher substantial application potential since it shortened the enzyme production period while still kept the merit of forming less spores during enzyme fermentation, and the optimal reaction pH and temperature of the produced enzyme were also unchanged.

Stably Convergence in Distribution About Wavelet Estimation in Semiparametric Regression Model——The Martingale Difference Error Sequence Case

Abstract: Consider the semiparameter regression modely_i=x_iβ+g(t_i)+e_i,1≤i≤n where β is a unknown parameter, g(t) is an unknown Borel function on \, x_i is a random design, random error sequences {e_i,1≤i≤n} is martingale difference sequences, {t_i} is constant sequence on\. In the paper, the estimators of β g(t) are established by wavelet method, and stably convergence to quasi-distribution function G in distribution about n(β∧-β) is studied.

A New Method to Estimate Signal Number by Echo’s Phase

Abstract: Due to the failure of tradional determination method of signal number,when using harmonic retrieval to detect target in frequency domain by HF ground wave radar,a new method to estimate the number of signal by echo’s phase is developed in this paper.The theory based on is presented,the processing procedure and results of real data are investigated at last.

Molecular Cloning and Sequence Analysis of Ribosomal Protein L15 (RPL15) cDNA Fragments Respectively from Coturnix coturnix japonica and Rana nigromaculata

Abstract: The cDNA fragments of ribosomal protein L15 (RPL15) were cloned respectively from Rana nigromaculata and Coturnix coturnix japonica by RT-PCR. The two cDNA fragments are individually composed of 467 bp and 408 bp, encoding a protein fragment of 155 aa and another one of 136 aa. Alignment analysis indicated that both the two nucleotide sequences and the deduced amino acid sequences show high identity to other known rpl15 sequences from vertebrates. The two cDNA sequences were used to construct phylogenetic trees with other known vertebrate rpl15 sequences, and the obtained trees demonstrated similar topology with the classical systematics.