Table of Content

20 August 2012 Volume 25 Issue 4

  

Content

Degree sequence conditions of maximally and super-local-edge-connected digraphs depending on a clique number

GAO Jing-Zhen, YANG Hua-Mei

J4. 2012, 25(4):  1-5.  doi:10.3976/j.issn.1002-4026.2012.04.001

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        We present the degree sequence conditions of maximally and super-local-edge-connected digraphs  depending  on a clique number with the theorem of Turán. Different cases show that these conditions are the most  possible.

Conditional chromatic number of several special types of graphs

LIU Ting, SUN Lei

J4. 2012, 25(4):  6-9.  doi:10.3976/j.issn.1002-4026.2012.04.002

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       Conditional (k,r) coloring of a graph G is a map c:V(G)→{1,2,…,k}  for positive integers k and  r. It satisfies two conditions that if  u,v∈V(G)  are adjacent vertices in  G, then c(u)≠c(v), and that |c(N(v))|≥ min{|N(v)|,r} for any v∈V(G). The conditional chromatic number of a graph G,χ_r(G), is the smallest k that makes G have a proper(k,r)coloring. We address the conditional chromatic number of several special types of graphs when r is 3.

Existence of a positive solution for boundary value problem of a coupled  system on a half-line

WANG Ming-Gao, TANG Qiu-Yun

J4. 2012, 25(4):  10-12.  doi:10.3976/j.issn.1002-4026.2012.04.003

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        This paper addresses the existence of a positive solution for boundary value problem of a coupled system of nonlinear differential equations on a half-line with fixed point theorem of cone expansion and compression.

Research on the regulation of laser polarization direction to the photodetachment of a negative hydrogen ion near a metal surface

ZHU Guang-Qiao, ZHANG Yong-Sheng, WANG De-Hua

J4. 2012, 25(4):  13-17.  doi:10.3976/j.issn.1002-4026.2012.04.004

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      This paper investigates the impact of the laser polarization direction on the photodetachment of a negative hydrogen  ion near a metal surface with the theory of closed orbit. Experimental results show that oscillating amplitude of the photodetachment cross section is maximal when the laser polarization direction is vertical to a metal surface. However, the oscillation amplitude is almost zero when the laser polarization direction is parallel to a metal surface. The oscillation amplitude  is between zero and maximum when the laser polarization direction is between parallel and vertical. The experimental results have certain referential value for the photodetachment of negative ions near a surface.

Theoretical research on the structures and decomposition mechanism  of N₄O_n(n=3~5) clusters

HU Feng, ZHANG Tao, LIU Xiao-Xia, ZHAO Xin-Zhou, MA Wan-Yong, ZHOU Jian-Hua

J4. 2012, 25(4):  18-21.  doi:10.3976/j.issn.1002-4026.2012.04.005

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        We optimized possible geometrical structures of N₄O_n(n=3~4) clusters at the B3LYP/6-31G* level and obtained  five isomers of N₄O₃ and N₄O₄. We also addressed the possibility of N₄O_n(n=3~4) clusters, high energy density materials. We further discovered five transitional states of the dissociation reaction of N₄O₃ (A3, A4), N₄O₄ (B3, B4) and N₄O₅ (Z8) clusters with functoinals B3LYP, BB1K and MPWB1K and the basis set 6-31G* and analyzed their composition mechanism. Energy barrier of functional B3LYP is much lower than that of the other two functionals. Energy barriers of functionals BB1K and MPWB1K are similar to each other and are more reliable than that of functional B3LYP. Therefore, functionals BB1K and MPWB1K are two better methods to calculate the transitional state.

Determination of hydrolase activity of  Cyathus  spp. and  Nidula  spp.

YANG He-Tong, CHEN Kai, LI Ji-Shun, ZHOU Hong-Zi, ZHAO Xiao-Yan

J4. 2012, 25(4):  22-26.  doi:10.3976/j.issn.1002-4026.2012.04.006

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         We determined the activities of five kinds of hydrolases from nine Cyathus  and six  Nidula  isolates for the proper utilization and evaluation of bird's nest fungi. Experimental results show that there are significant differences for the same hydrolase activity among different isolates, as well as for the same isolate among different hydrolase activities.  Nidula  spp. 134 shows the highest chitinase activity of 122.1 U/mL.  Cyathus spp. 24 shows the highest β-1, 3 glucanase activity of 143.7 U/mL. Cyathus spp. 185, cultured at 25℃, shows the highest cellulase activity of 62.3U/mL. It also shows the highest cellulase activity of 137.6 U/mL when cultured at 35℃. The cellulase activities of all isolates cultured at 35℃ for 4 weeks are higher than those cultured at 25℃ for 2 weeks. Nidula spp. 134 shows the highest xylanase activity of 464.8 U/mL when cultured at 25℃. Cyathus spp. 185 shows the highest xylanase activity of 745.6 U/mL when cultured at 35℃. The xylanase activity of all isolates cultured at 35℃ for 4 weeks are higher than those cultured at 25℃ for 3 weeks. Cyathus spp. 150 shows the highest lignin peroxidase activity of 0.297 U/mL when cultured at 25℃. Cyathus spp. 185 shows higher complex hydrolase activities, as compared with other isolates. It may be desirable for the degradation of plant straw.

HS-SPME-GC-MS analysis of volatile components in fresh and dried leaves of  Artemisia argyi

WANG Li, ZHAO Xian-En, WANG Xiao, GENG Yan-Ling, LIU Jian-Hua, LIU Wei

J4. 2012, 25(4):  27-31.  doi:10.3976/j.issn.1002-4026.2012.04.007

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        We analyzed volatile components in fresh and dried leaves of Artemisia argyi Levl. et Vant. with headspace solid phase microextraction ( SPME) and GC-MS. We also investigated the impacts of different SPME fibers and extraction temperature on the extracts. Results demonstrate that 65 μm PDMS /DVB fibre and temperature of 60 ℃ exhibit good extraction effect．We employed peak area normalization method to determine the volatile components. Fifty-eight compounds are identified in the fresh and dried leaves of Artemisia argyi, which include alkanes，alkenes and alcohols，and whose area exceeds 90% of the total peak area. Results also show that fresh and dried leaves of Artemisia argyi not only contain identical volatile compounds such as Camphene, 1-Octen-3-ol, alpha Phellandrene, Benzene, 1-methyl-2 (1-methylethyl) Eucalyptol and Caryophyllene, but also contain their own unique volatile compounds. This shows that their volatile  components  change after dryness.

Research on negative impacts of vitrification of Salvia miltiorrhiza Bge.f.alba plantlets

QI Cui-Ying, WANG Ning, LI Xu-Xia, WANG Feng-Xiang, LI Feng-Sheng, ZHU Fu-You

J4. 2012, 25(4):  32-35.  doi:10.3976/j.issn.1002-4026.2012.04.008

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          This paper addresses the impacts of different culture conditions on the vitrification of Salvia miltiorrhiza Bge.f.alba seedlings. We investigated the influences of KT/NAA ratio, active carbon and agar concentration on the prevention of vitrification of tissue culture seedlings with the tender stems of Salvia miltiorrhiza Bge. f.alba C.Y. Wu et H.W.Li.‘ buyu’ as the explants and MS as basic medium. Experimental results show that the tissue culture seedlings has higher bud multiplication coefficient and lower vitrification rate when KT concentration of 1.5 mg·L^-1, NAA concentration of 0.5 mg·L^-1, active carbon of 0.3% and agar concentration of 0.8% are employed. Therefore, the MS+KT 1.5 mg·L^-1 +NAA 0.5 mg·L^-1 + agar 0. 8% +active carbon 0.3% medium can effectively prevent vitrification of plantlets.

Failure analysis of early fracture of the combination rib in a change wheel of ADC14 aluminium alloy

XU Na, LI En-Xia, SHI Jun-Bo, GUO Wei-Min, MA Hong, LI Yong-De

J4. 2012, 25(4):  36-39.  doi:10.3976/j.issn.1002-4026.2012.04.009

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          We analyzed early fracture cause for the combination rib in a change wheel of ADC14 aluminium alloy with chemical composition analysis, SEM observation and metallographic examination. Results show that inhomogeneous distribution of thick massive primary silicon, intergranular distribution of massive brittle phase, acicular brittle iron phase and more casting defects of porosities in the matrix can make the plasticity reduction and the brittleness increase, and further cause early brittle fracture of the rib. We therefore present the improved methods for casting technique.

Partition based image restoration with improved Wiener filtering

JIANG Shu-Ming, DUAN Cai-Yan, WEI Zhi-Qiang, LIU Xiang-Yang, YU Jun, LIU Xiao-Hui, ZHAO Liang

J4. 2012, 25(4):  40-44.  doi:10.3976/j.issn.1002-4026.2012.04.010

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       Image restoration is a key issue in digital image processing. Image quality will decline due to camera defous, relative motion between a camera and an objective and noise. This paper presents partition based image restoration approach with improved Wiener filtering for the constraint of classical Wiener filtering. The method can not only perform pseudo morph attenuation and noise suppression, but also preserve the edge of an image. We evaluate the signal to noise ratio (SNR) of the peak values of a processed image by the two methods. Experimental results show that the peak SNR of an image processed by improved restoration method is higher than that of an image processed by the classical method.

A PLC and converter based pulsed ropeway control system

ZHANG Lei, WANG Ren-Zheng, YIN Yan-Hua, YIN Bing-Lai

J4. 2012, 25(4):  45-48.  doi:10.3976/j.issn.1002-4026.2012.04.011

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         This paper presents a control system for a frequency control based single pulsed ropeway. We give the composition and control theory of its main circuit. We also devise a detailed acceleration and deceleration control algorithm for a high power pulsed ropeway and achieve a touch screen and real time display and memory of all kinds of faults. The system  can replace the traditional mode that high power pulsed ropeway is drived by DC device only and has been applied to many projects.

Research on a FFT based FBG mechanical vibration monitoring system

ZHAO Lin, MIN Li, LI Shu-Juan

J4. 2012, 25(4):  49-52.  doi:10.3976/j.issn.1002-4026.2012.04.012

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         We designed a fiber grating mechanical vibration monitoring system with fiber Bragg grating sensor. The system realized multiple parameter monitoring and remote transmission of vibration frequency, acceleration, velocity and displacement by fast demodulation of real time vibration signal and could provide complete data analysis and display. Experimental results show that the system can be effectively applied to turbine engine and coal mine vibration monitoring, and can provide software support for the fault diagnosis of a mechanical equipment.

Research on short term traffic volume forecasting approaches for  the urbanized section of a freeway

ZHOU Wei, JIA Yuan-Hua, CHEN Feng

J4. 2012, 25(4):  53-57.  doi:10.3976/j.issn.1002-4026.2012.04.013

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         We construct a short term traffic volume forecasting model based on the analysis of the cause of the congestion of the urbanized section of a freeway and RBF neural network. It will provide basic theory and technical support for the evaluation of the service level and the traffic control and pilot of a freeway. We eventually verify the effectiveness of the model, taking Jingjintang freeway as an example. Result shows that the model is reasonable and feasible.

Research on limited capacity based co-evolution of road surface and urban traffic

XU Ming-Tao, WU Jian-Jun

J4. 2012, 25(4):  58-63.  doi:10.3976/j.issn.1002-4026.2012.04.014

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         Quite complicated co-evolution process exists between urban road surface and traffic. This paper constructs their co-evolution model based on constrained capacity. We also perform its stability analysis and simulation. Results demonstrate that the co-evolution model is steady and can reach balance under mutual feedback. Furthermore, parameter control adjustment can coordinate the co-evolution process.

Research on intelligent control of highway tunnel illumination

LUO Hai-Xing, YUAN Zhen-Zhou, KUANG Ai-Wu

J4. 2012, 25(4):  64-68.  doi:10.3976/j.issn.1002-4026.2012.04.015

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          We deployed velocity coils at some suitable locations and employed RBF neural network to predict the velocity between two adjacent coils for the implementation of such intelligent control technology as light following vehicle. We also constructed a tunnel characteristic based tunnel stopping sight distance model, which determined a realistic and safe light length. We eventually presented the idea of smart illumination control.The analysis of practical cases shows that energy saving rate is more than 90% when the traffic throughput is lower than 3 000 pcu a day.

Research on a Vensim simulation based prediction method of urban vehicle fuel consumption

HAN Yu, ZHANG Xi

J4. 2012, 25(4):  69-72.  doi:10.3976/j.issn.1002-4026.2012.04.016

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       Correct prediction of fuel consumption of urban cars has great significance to scientifically evaluate urban traffic environment pollution and even to formulate the relevant policies. This paper constructs the causal diagram and system flow chart of urban car fuel consumption with the theory and method of system dynamics. We quantify the factors influencing fuel consumption and present a predictive model. We eventually analyze fuel consumption of Beijing as a concrete example and verify its correctness with simulation software, Vensim.

Design of a PIC18F2520 based polarographic dissolved oxygen sensor

LV Bin, LEI Zhuo, LIU Jie, QU Jun-Le

J4. 2012, 25(4):  73-77.  doi:10.3976/j.issn.1002-4026.2012.04.017

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       We designed a dissolved oxygen sensor with the principle of polarographic dissolved oxygen and PIC18F2520 as a core controller. We also addressed the compensation algorithm of a DO sensor in temperature, pressure and salinity. Experiments show that a DO sensor has such advantages of simple structure and stable performance, temperature accuracy of ±0.3 ℃ and DO accuracy of ±0.07 mg/L.

Common data structure of a marine monitoring signal acquisition software system

CHENG Yan, MA Ran, ZHANG Ying-Ying

J4. 2012, 25(4):  78-82.  doi:10.3976/j.issn.1002-4026.2012.04.018

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        We design a data structure for a general oceanographic parameter online monitoring software system. It can flexibly configure the parameters of a data acquisition system and its connected sensors. It is programmed with Visual C++. We construct the corresponding class for the properties of data acquisition, sensors and collectors. Experiments show that the system has higher stability and reliability and strong expansion capability.

Electrical controll system of NUTM426 ultrasonic detection equipment

MENG Ling-Hua, ZHAO Hong-Xian

J4. 2012, 25(4):  83-86.  doi:10.3976/j.issn.1002-4026.2012.04.019

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        We present a control scheme and software design method of an online automatic ultrasonic detection equipment (an electrical control system) of NUTM426, based on S7-200PLC. The S7-200PLC based control system has such positive characteristics as better performance, higher reliablity and higher cost performance. Scene test shows that the system satisfies the requirements of ultrasonic flaw detection for a gas cylinder.