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Table of Content

      
    16 January 2016
    Volume 51 Issue 1
    The application of flame combustion synthesis in the preparation of metal oxide and supported noble metal catalysts
    LI Jia-qi, DENG Yu-zhou, LIU Gang, YUE Ren-liang, YANG Jun, CHEN Yun-fa
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  1-13.  doi:10.6040/j.issn.1671.9352.5.2015.004
    Abstract ( 244 )   PDF (2388KB) ( 176 )   Save
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    Flame combustion synthesis (FCS) is widely used to produce nanoparticles on a large scale, and has been applied in the preparation of carbon black and fumed silica. FCS is a versatile technique to be used but not limited in the specific field of catalyst preparation, gas sensor fabrication, luminant materials and antibacterial materials. In the review, we focus on the recent advances in using FCS for the catalyst preparation, including metal oxides and supported noble metals, and in the last section, we make some perspetives for the future developments of this promising synthetic technique.
    Assembled nanostructures of ZnO nanorods prepared by seed growth method
    ZHANG Yao-jun, WAN Gang-qiang, YAN Lei, MA Qing-chang, LI Dong-xiang, ZHAO Ji-kuan
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  14-19.  doi:10.6040/j.issn.1671-9352.0.2015.079
    Abstract ( 481 )   PDF (2424KB) ( 612 )   Save
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    Herein, various assembled nanostructures of ZnO nanorods were prepared by microwave synthesis from zinc acetate precursor in presence of Zn-Al hydrotalcite seeds and characterized by SEM and XRD. It was found that the flower-like nanostructures of ZnO nanorods were prepared at a relative low seed usage, in which ZnO nanorods had a length of several hundred nanometer to two micrometer and a diameter of 100-300 nanometer. Whereas, the hierarchical nanostructures of large Zn-Al hydrotalcite plates with “two-side” attached ZnO nanorods or nanotubules were easily obtained as adding a large amount of seed solution.
    The optical properties of N doped rutitle TiO2: first-principles calculations
    LIN Xue-ling, PAN Feng-chun, CHEN Huan-ming
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  20-26.  doi:10.6040/j.issn.1671-9352.0.2015.262
    Abstract ( 670 )   PDF (2148KB) ( 371 )   Save
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    The electronic structure and optical properties of N doped rutile TiO2 systems were investigated by the first-principles calculations of LDA+U method with U for Ti-3d and O-2p (UTi-3d=7 eV,UO-2p=4 eV). The calculations results show that the impurity energy level is introduced due to the coupling between O-2p and N-2p, and the band-gap is reduced because of the N dopant, which both can increase the TiO2 absorption edge to the visible region, and therefore facilitate the enhancement of the photocatalytic efficiency. The coupling of O-2p and N-2p states near the Fermi level forms the π bonds. The energy difference between the occupied π bonds and unoccupied σ bonds is 0.4 eV, which implies that the optical absorption-edge is in the infrared region. In other words, the N dopant makes the absorption-edge red shift.
    Influences of phenolic acids on soil nitrification in poplar plantation
    YI Wen-hui, WANG Yan-ping, WANG Hua-tian, MA Xue-song, WANG Wen-bo
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  27-35.  doi:10.6040/j.issn.1671-9352.0.2015.073
    Abstract ( 408 )   PDF (2831KB) ( 367 )   Save
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    Take the non-rhizosphere soils of the first generation stands in poplar plantation as test material by the method of appalling NH4-N into soil samples with gradient concentration of exogenous phenolic acids, and cultured in a period of time in laboratory. The influences of different concentration phenolic acids to NO3-N and NH4-N in nitrification process was analyzed. Dynamic equations of NO3-N and NH4-N in nitrification process was used to elucidate the influence to soil nitrogen cycle. Results show that as the concentration of phenolic acids increased, accumulate asymptotic values of NO3-N and consume asymptotic values of NH4-N both decreased gradually, maximum accumulating speeds of NO3-N decreased gradually, maximum consuming speeds of NH4-N has no significant differences, the time to reach maximum accumulating and consuming speeds of NO3-N and NH4-N was both postponed, the increase amplitude of soil pH was enhanced and the recovery rate of nitrification decreased gradually, the inhibition to nitrification ability was strengthen.
    Fabrication of a three-dimensional fish collagen scaffold and its biocompatibility characterization
    YUAN Xiao-long, XU Bin, FAN Ting-jun
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  36-42.  doi:10.6040/j.issn.1671-9352.0.2015.219
    Abstract ( 457 )   PDF (2860KB) ( 485 )   Save
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    To verify the feasibility of deep-sea fish collagen to be utilized in fabrication of the scaffold for tissue-engineered cornea, a novel three-dimensional(3D)collagen scaffold was produced using fish skin collagen for the first time and its biocompatibility was evaluated in this study. After freeze dried fish skin collagen, purified from the skin of Gadus microcephalus, was cross-linked using N-(3-Dimethylaminopropyl)-N' -ethylcarbodiimide hydrochloride crystalline(EDC)/N-Hydroxysuccinimide(NHS), a 3D-collagen scaffold was obtained. Its transparency and histological structure were detected and identified by macroscopy, photospectrometry, hematoxylin-eosin(HE)staining of frozen sections, scanning electron microscope. After DiI(1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate)-labeled human corneal stromal(HCS)cells were inoculated onto the scaffold, the immigration and distribution of the cells were identified by HE staining of frozen sections and fluorescent microscopy. The biocompatibility of the scaffold to HCS cells was characterized by MTT assay and immunocytofluorescent microscopy to examine the cell viability and expression patterns of marker protein and functional proteins. Our results showed that the fabricated 3D-collagen scaffold had an excellent transparency, uniform organized reticular structure with pore size of 50-130 μm. After HCS cells were 山 东 大 学 学 报 (理 学 版)第51卷 - 第1期袁晓龙,等:三维鱼类胶原支架的制备及其生物相容性研究 \=-inoculated onto the scaffold, a lot of the cells could migrate into the scaffold, and the inoculated HCS cells distributed regularly in the scaffold 3 days after cultured in vitro. Moreover, the extracts of the scaffold had no obvious adverse effects on the viability of HCS cells. The inoculated HCS cells still maintained the positive expression of the marker protein of vimentin, cell junction proteins of integrin β1, E-cadherin and connexin-43, membrane transport protein of Na+-K+-ATPase, and anti-UV protein of acetaldehyde dehydrogenase. In conclusion, the 3D-collagen scaffold fabricated from G.macrocephalus skin collagen, in good transparency and histological structure, was suitable for HCS cell immigration, and has good biocompatibility to these cells. The 3D-collagen scaffold has promising potentials to be used in the in vitro construction of tissue-engineered cornea.
    Research on classification for Chinese short film reviews
    MA Li-fei, MO Qian, DU Hui
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  52-57.  doi:10.6040/j.issn.1671-9352.1.2015.062
    Abstract ( 496 )   PDF (1400KB) ( 567 )   Save
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    Aiming at the problems of film reviews that the sentences are short and characteristics matrix is sparse, a method using ontology to expand the matrix was proposed. Through comparison and analysis of traditional and developmental text classification methods, a suitable way for Chinese short film reviews classification was found. The experiment results proved that the decision tree is better than the SVM, Bayes and KNN in this essay, and the decision tree classifier was further used to classify the feature vectors of the ontology expanding. The results of experiment showed that the effect of Chinese short film reviews classification based on the ontology expanding was 3% higher than the traditional methods, and the classification accuracy reached 90.1%.
    Extraction of opinion targets and opinion words from Chinese sentences based on word alignment model
    CHEN Xing-jun, WEI Jing-jing, LIAO Xiang-wen, JIAN Si-yuan, CHEN Guo-long
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  58-64.  doi:10.6040/j.issn.1671-9352.1.2015.035
    Abstract ( 649 )   PDF (1754KB) ( 752 )   Save
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    This paper proposed an approach to extract opinion targets and opinion words based on the idea of statistical machine translation. This method extracted the associations between opinion targets and opinion words by using word alignment model, whose strength was estimated with word co-occurrence. To model these associations, the approach constructed a bipartite graph. Then a domain relevance measure was used, and random-walk algorithm was applied to calculate the confidence of each opinion target candidates and opinion word candidates. The method was evaluated on the labeled corpus of task 3 in COAE2011.The experiment results showed that it could effectively improve the accuracy by employing the model of word-alignment to extract opinion targets and opinion words, and the method could extract more targets and words simultaneously.
    A text clustering algorithm based on find of density peaks
    LIU Ying-ying, LIU Pei-yu, WANG Zhi-hao, LI Qing-qing, ZHU Zhen-fang
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  65-70.  doi:10.6040/j.issn.1671-9352.1.2015.042
    Abstract ( 531 )   PDF (1510KB) ( 932 )   Save
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    A text clustering algorithm based on find of density peak was proposedin this paper. The algorithm was implemented by the calculation of text distance and density,which was in accordance with calculation of the text vector similarity. VSM(Vector Space Model)was used to express ducument to obtain the similarity calculation with cosine formula. The cucument work was to find the local density and the distance from points of higher density of each ducument, remove the noise points and select the cluster center. The remainednon-centralpoints were assigned into the cluster which was the nearest to the cluster center. According to several sets of contrast experiments, the density-based text clustering was improved to have an advantage of reliability and robustness.
    Emotional contagion in Twitter
    ZHANG Shao-qun, WEI Jing-jing, LIAO Xiang-wen, JIAN Si-yuan, CHEN Guo-long
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  71-76.  doi:10.6040/j.issn.1671-9352.1.2015.053
    Abstract ( 630 )   PDF (1317KB) ( 460 )   Save
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    It is a problem to be solved in social science whether there exists the phenomenon of emotional contagion in Twitter. The emotion time series of 106 641 users in the Twitter social network were got by the LIWC2007. Then a serious of unit root tests were used to validate that the time series are stable. Through the Granger causality test, the emotion variable of the users' followees in the past time was added to the regression equation to predict the users' emotion and then the statistical hypothesis tests was used to prove the regression coefficient of the variable was significantly not equal to 0, which indicated that the users' emotion could be influenced by their followees' emotional expression in the past time, which meaned that the emotion expressed by users' followees was the Granger cause of the emotion expressed by users. At the same time, the same method proved that the emotion expressed by users was not the Granger cause of the emotion expressed by users followees. Since the social selection was a type of bidirectional relationship, this phenomenon was caused by emotional contagion. Furthermore, the statistical results showed that most of the unidirectional followees in Twitter were not acquaintances in real life but most of the bidirectional followees in Twitter were acquaintances in real life. The results of the Granger causality also suggested that the people, either acquaintances or not acquaintances, could spread their emotion to others in Twitter.
    A bilingual word alignment method of Vietnamese-Chinese based on deep neural network
    MO Yuan-yuan, GUO Jian-yi, YU Zheng-tao, MAO Cun-li, NIU Yi-tong
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  77-83.  doi:10.6040/j.issn.1671-9352.3.2014.289
    Abstract ( 707 )   PDF (1557KB) ( 514 )   Save
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    It is difficult to achieve auto-alignment between Vietnamese and Chinese, because their syntax and structure are quite different. In this case, we present a novel method for the Vietnamese-Chinese word alignment based on DNN(deep neural network). Firstly, we should convert Vietnamese-Chinese bilingual word into word embedding, and as the input within DNN. Secondly, DNN-HMM word alignment model is constructed by expanding HMM model, which also integrating the context information. The basic model of the experiments are HMM and IBM4. The results of large-scale Vietnamese-Chinese bilingual word alignment task show that this method not only significantly improved its accuracy and recall rate than the two basic models, but also greatly reduced word alignment error rate.
    An improved self-adaptive harmony search optimization algorithm
    GE Yan-qiang, WANG Xiang-zheng
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  84-88.  doi:10.6040/j.issn.1671-9352.1.2015.076
    Abstract ( 456 )   PDF (997KB) ( 410 )   Save
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    Based on the traditional harmony search optimization algorithm, a search optimization algorithm of self-adaptive gemini harmonies was proposed. By establishing two primary harmony and secondary harmony libraries, iterative searching along positive and negative directions, and adaptively adjusting two important parameters of pitch adjusting rate and band width of optimization algorithm, the algorithms dynamic adaptive ability and the coordination ability between local search and global search was improved. Two primary harmony and secondary harmony were constructed that were in different directions and cooperative, which made full use of the hidden information in the search domain, enhanced the searching area, and realized the global optimal. Three complex functions was tested in experiment, the results show that the algorithm had better global search ability and convergence rate compared with the original algorithm, the search ability of the optimal value was improved to some extent, which achieved the anticipated effects.
    Trust-aware product recommendation based on factorization machine
    GAO Xiao-bo, FANG Xian-mei, LI Shi-jun
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  89-94.  doi:10.6040/j.issn.1671-9352.1.2015.106
    Abstract ( 465 )   PDF (1438KB) ( 937 )   Save
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    The personalized recommender system suffers from sparse data and slow recommendation speed. A score prediction model based on Factorization Machine(FM)was proposed. The FM model utilizes users access history, identifies user-interested contents based on their scoring records and integrates trusts among different users. FM has a linear time complexity and excellent learning capability for sparse data, so it can quickly recommend. The results showed that the proposed FM model based on product recommendation approach was significantly more accurate than the traditional methods.
    Text topic mining of archives research based on SVD
    FENG Guo-he, WANG Dan-di, LI Mei-chan
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  95-100.  doi:10.6040/j.issn.1671-9352.1.2015.C03
    Abstract ( 415 )   PDF (1127KB) ( 344 )   Save
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    The data of National Social Science Fund Project on Archives Field from 2010 to 2014 were collected, the words of the project title are separated, and the term-document matrix was obtained. According to the importance level of the terms, local and whole weight was designed, local weight was integrated with whole weight, which obtained the weight value of the term-document matrix. Feature dimension reduction was implemented by SVD, the recent National Social Science Archives Project themes in different dimensions were studied. Eventually, seven research topics of social science archives were obtained by visually analyzing, which were the intangible cultural heritage protection, electronic document management, digital resource construction, value and research of the archival information resource, archival information protecting system, research of the archives, security of the archival information.
    Color constancy using hierarchy segments
    WANG Lei, XIE Jiang-ning
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  101-105.  doi:10.6040/j.issn.1671-9352.0.2015.357
    Abstract ( 466 )   PDF (3066KB) ( 456 )   Save
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    Color constancy is the ability to measure colors of objects independent of the color of the light source. A well-known color constancy method is based on the gray-world assumption which assumes that the average reflectance of surfaces in the world is achromatic. In this paper, instead of applying gray world method on the entire image, the images was segment into a lot of segments using a hierarchical segmentation method, and the simple gray world approach was applied on each segments. Then, estimated results from different segments were clustered together to get a final result. Experiment results show that the proposed algorithm outperforms the original gray world method. The mean error is reduced to 36.0% with respect to the original gray world method and the median error is reduced to 63.5%. Our method outperforms state-of-the-art color constancy algorithms and produces comparable results with the best published scores on the same dataset.
    A community mining algorithm based on core nodes expansion
    LIU Jing-lian, WANG Da-ling, ZHAO Wei-ji, FENG Shi, ZHANG Yi-fei
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  106-114.  doi:10.6040/j.issn.1671-9352.1.2015.121
    Abstract ( 463 )   PDF (2828KB) ( 638 )   Save
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    Based on the connections between the nodes in a network and the influence of each node, a community mining algorithm based on expansion of core nodes was proposed in this paper. The algorithm was divided into three stages. Firstly, the top-k core nodes were expanded to their neighbors until most nodes were covered in the network, that the core nodes and its neighbors formed candidate initial communities. Secondly, candidate initial communities were overlap processed, the overlap degree of each candidate initial communities pair was calculated, and the small candidate initial community was deleted if the overlap degree is greater than a given threshold. The left communities formed the initial communities. Finally, the connection degree for the overlap nodes between the initial communities and the nodes outside the communities to each candidate initial communitiy was calculated, and the node with maximum connection degree was added to the corresponding initial community. These operations were repeated until all nodes were assigned to the respective community. Experiment results showed the effectiveness and flexibility of the proposed algorithm in this paper. Compared with the GN and FN algorithm, our algorithm could divide the network accurately. Due to the overlap operation of the candidate initial communities, our algorithm was not sensitive within a certain range compared with Hub and TopLeaders algorithms.
    Analysis of an SEQIHRS epidemic model with media coverage
    WU Jing-yuan, SHI Rui-qing
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  115-122.  doi:10.6040/j.issn.1671-9352.0.2016.117
    Abstract ( 494 )   PDF (956KB) ( 361 )   Save
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    An SEQIHRS epidemic model is proposed for the transmission dynamics of an infectious disease with quarantine and isolation control strategies. Firstly, we obtain the effective reproduction number RC of the system. Secondly, simple calculations indicate that the system always exists a disease-free equilibrium, and it is locally asymptotically stable if RC<1, whereas it is unstable if RC>1. Thirdly, by use of central manifold theory, it is established that as RC passes through unity, transcritical bifurcation occurs in the system and the unique endemic equilibrium is asymptotically stable. In addition, mathematical results indicate that infectiousness of hospitalized individuals will determine how the government takes control measures.
    Nehari manifold and application to blow-up for a class of semilinear parabolic equations
    LIU Yang, DA Chao-jiu, LI Fu-ming
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  123-127.  doi:10.6040/j.issn.1671-9352.0.2015.003
    Abstract ( 387 )   PDF (925KB) ( 268 )   Save
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    The initial boundary value problem for a class of semilinear parabolic equations with positive initial energy is studied. The finite time blow-up of solutions is obtained by the Nehari manifold and the convexity method. Moreover, the relationship between initial energy and finite time blow-up of solutions is described.
    The stability of stochastic SIQS epidemic model with saturated incidences
    LIN Qing-teng, WEI Feng-ying
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2016, 51(1):  128-134.  doi:10.6040/j.issn.1671-9352.0.2015.001
    Abstract ( 560 )   PDF (1427KB) ( 369 )   Save
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    A kind of stochastic SIQ epidemic model with saturated incidences is investigated. By using of the stop time and Ito formula, the existence-and-uniqueness of global positive solution for the model is obtained. By constructing suitable Lyapunov function, the exponential stability and ergodicity of the solution are derived under some moderate conditions. And numerical simulations are carried out to illustrate our results.