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Search Results: 1 - 10 of 42531 matches for " MA Ji "
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Signal analyser, the software support for education of signal processing
ma Ji?í
Acta Montanistica Slovaca , 2003,
Abstract: The paper deals with the software that is supporting signal-processing lectures given for students of mechanical engineering. An application, named Signal Analyser is written in Visual Basic 6.0 language so it is working under Windows operating systems. The main idea is to demonstrate spectral analysis of signals that are taken from measurements in industry or synthesised by an incorporate signal generator.
The matching energy of graphs with given edge connectivity
Shengjin Ji,Hongping Ma
Mathematics , 2014,
Abstract: Let G be a simple graph of order $n$ and $\mu_1,\mu_2,\ldots,\mu_n$ the roots of its matching polynomial. The matching energy of $G$ is defined as the sum $\sum_{i=1}^n|\mu_i|$. Let $K_{n-1,1}^k$ be the graph obtained from $K_1\cup K_{n-1}$ by adding $k$ edges between $V(K_1)$ and $V(K_{n-1})$. In this paper, we show that $K_{n-1,1}^k$ has maximum matching energy among all connected graph with order $n$ and edge connectivity $k$.
Multispectral Imaging for Authenticity Identification and Quality Evaluation of Flos carthami  [PDF]
Cuiying Hu, Qingxia Meng, Ji Ma, Qichang Pang, Jing Zhao
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.33037

The identification and quality evaluation of Flos carthami were studied using tunable liquid spectral imaging instrument, to discuss the application range and advantages of spectral imaging technology in Chinese medicine identification and quality control field. The Flos carthami was indentified by extracting the normalized characteristic spectral curves of Flos carthami, Crocus sativus and Dendranthema morifolium, which were standard samples supplied by National Institute for Drug Control. The qualities of Flos carthamies collecting from different pharmacies were evaluated by extracting their normalized characteristic spectral curves. The imaging spectrum testing system was designed independently. The spectral resolution was 5 nm, and the spectral range was from 400 nm to 680 nm. The results showed that the normalized characteristic spectral curve of Flos carthami was significantly different from those of Crocus sativus and Dendranthema

Application of Multispectral Imaging Method in Rapid Identification and Analysis of Chinese Herbal Medicine Powders  [PDF]
Cuiying Hu, Qingxia Meng, Qichang Pang, Ji Ma, Jing Zhao
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32024

Five kinds of traditional flower Chinese medicine powders (TFCMD) were identified using tuneable liquid spectral imaging instrument, to discuss the application range and advantages of spectral imaging technology in Chinese medicine identification and analysis field. The testing system is the liquid crystal multispectral imaging system designed by ourselves. All the tests are standard samples supplied by National Institute for Drug Control. The spectral cubes of Campsis grandiflora, Carthamus tinctorius, Albizzia julibrissin, Dendranthema morifolium, and Dendranthema indicum were captured, and then the normalized characteristic spectral curves of them were picked up. The spectral resolution is 5 nm, and the spectral range is 400 nm - 650 nm. The result shows that different TFCMD has different normalized characteristic fluorescence spectral curve. Spectral imaging technology can be used to identify TFCMD, and the testing course is convenient, quick, noninvasive and without pre-treatment.

Investigation on resonant laser ablation spectrum of Fe in 281.5–285.5 nm wavelength region
Ma Jing,Ji Xuehan,Cui Zhifeng
Optica Applicata , 2008,
Abstract: Laser ablation of solid Ti samples has been studied using a tunable pulsed dye laser. Six resonant laser ablation (RLA) spectral lines of Fe in the Ti sample are firstly measured in the 281.5–285.5 nm wavelength region. The initial state of the RLA spectral lines is a5F, the resonant states are z5H0, x5P0 and y5G0, respectively. The influence of laser power density on the intensities of RLA spectrum is discussed. The relationship between the laser wavelength and the photo-ionization cross sections of the resonant state 5G0 is analyzed.
The roles of p38mAPK and caspase-3 in dads-induced apoptosis in human HepG2 cells
Chunxiao Ji,Heng Ma,Ren Fenglian
Archives of Biological Sciences , 2010, DOI: 10.2298/abs1002245c
Abstract: The roles of p38MAPK and caspase-3 in DADS-induced apoptosis in human HepG2 cells were investigated. After the human HepG2 cells were treated with DADS, the cell viability, apoptosis and the activity changes of p38MAPK and caspase-3 were measured. The results indicated that DADS can activate p38MAPK and caspase-3. The results showed that p38MAPK and caspase-3 are involved in the process of DADS-induced apoptosis in human HepG2 cells and interact with each other.
Preparation and Characterization of TiO2 Photocatalytic Thin Film and Its Compounds by Micro-Arc Oxidation Technique  [PDF]
Qun Ma, Lili Ji, Yinchang Li, Tingting Jiang, Junxia Wang, Fei Li, Hongyun Jin, Yongqian Wang
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.38044

Mesoporous TiO2 ceramic films have been prepared upon the Ti alloy substrate by the micro-arc oxidation (MAO) technology. To enhance the photo-catalytic property of the films, Eu2O3 particles were added into the electrolyte solution of Na2CO3/Na2SiO3. Scanning electron microscope (SEM), energy dispersive (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) are employed to characterize the modified films. Diffuse reflectance spectra (DRS) test, photo-generated current test and photo decomposition test are applied to evaluate the photo-catalytic property of the modified films. The results show that Eu2O3 transformed into one-dimensional (1-D) nano-wires embedded within the composite film, and the film has high photo-catalytic property.


A Preliminary Study on Spatial Spread Risk of Epidemics by Analyzing the Urban Subway Mobility Data  [PDF]
Bu Zhao, Shunjiang Ni, Nuo Yong, Xun Ma, Shifei Shen, Xuewei Ji
Journal of Biosciences and Medicines (JBM) , 2015, DOI: 10.4236/jbm.2015.39003

The prevention and treatment of epidemic is always an urgent problem faced by the human being. Due to the special space structure, huge passenger flow and great people mobility, the subway lines have become the areas with high epidemic transmission risks. However, there is no recent study related to epidemic transmission in the subway network on urban-scale. In this article, from the perspective of big data, we study the transmission risk of epidemic in Beijing subway network by using urban subway mobility data. By reintegrating and mining the urban subway mobility data, we preliminary assess the transmission risk in the subway lines from the passenger behaviors, station features, route features and individual case on the basis of subway network structure. This study has certain practical significance for the early stage of epidemic tracking and prevention.

On the minimal energy of conjugated unicyclic graphs with maximum degree at most 3
Hongping Ma,Yongqiang Bai,Shengjin Ji
Mathematics , 2014,
Abstract: The energy of a graph $G$, denoted by $E(G)$, is defined as the sum of the absolute values of all eigenvalues of $G$. Let $n$ be an even number and $\mathbb{U}_{n}$ be the set of all conjugated unicyclic graphs of order $n$ with maximum degree at most $3$. Let $S_n^{\frac{n}{2}}$ be the radialene graph obtained by attaching a pendant edge to each vertex of the cycle $C_{\frac{n}{2}}$. In [Y. Cao et al., On the minimal energy of unicyclic H\"{u}ckel molecular graphs possessing Kekul\'{e} structures, Discrete Appl. Math. 157 (5) (2009), 913--919], Cao et al. showed that if $n\geq 8$, $S_n^{\frac{n}{2}}\ncong G\in \mathbb{U}_{n}$ and the girth of $G$ is not divisible by $4$, then $E(G)>E(S_n^{\frac{n}{2}})$. Let $A_n$ be the unicyclic graph obtained by attaching a $4$-cycle to one of the two leaf vertices of the path $P_{\frac{n}{2}-1}$ and a pendent edge to each other vertices of $P_{\frac{n}{2}-1}$. In this paper, we prove that $A_n$ is the unique unicyclic graph in $\mathbb{U}_{n}$ with minimal energy.
Density-Based Region Search with Arbitrary Shape for Object Localization
Ji Zhao,Deyu Meng,Jiayi Ma
Computer Science , 2014, DOI: 10.1049/iet-cvi.2014.0442
Abstract: Region search is widely used for object localization. Typically, the region search methods project the score of a classifier into an image plane, and then search the region with the maximal score. The recently proposed region search methods, such as efficient subwindow search and efficient region search, %which localize objects from the score distribution on an image are much more efficient than sliding window search. However, for some classifiers and tasks, the projected scores are nearly all positive, and hence maximizing the score of a region results in localizing nearly the entire images as objects, which is meaningless. In this paper, we observe that the large scores are mainly concentrated on or around objects. Based on this observation, we propose a method, named level set maximum-weight connected subgraph (LS-MWCS), which localizes objects with arbitrary shapes by searching regions with the densest score rather than the maximal score. The region density can be controlled by a parameter flexibly. And we prove an important property of the proposed LS-MWCS, which guarantees that the region with the densest score can be searched. Moreover, the LS-MWCS can be efficiently optimized by belief propagation. The method is evaluated on the problem of weakly-supervised object localization, and the quantitative results demonstrate the superiorities of our LS-MWCS compared to other state-of-the-art methods.
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