Table of Content

20 April 2011 Volume 24 Issue 2

  

Content

A neighborhood condition of a super -λ_k trianglefree graph

HUANG Li, GAO Jing-Zhen

J4. 2011, 24(2):  1-5. 

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Let  k be a positive integer, and G be a connected trianglefree graph of order n≥2k. We prove that  G is a super -λ_k graph or K_k+1,n-k-1 if each pair of nonadjacent vertices u,v satisfy |N(u)∩N(v)|≥k+1.This result can be applied to the analysis of network reliability.

Linear Recursive Sequences and Polynomial Ring

SONG Guang-Ai

J4. 2011, 24(2):  6-7. 

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      This paper presents an intrinsic relation between a linear recursive sequences and a polynomial ring,and give out a correspondence between linear recursive sequences and an idea of polynomial ring with one variable.

Function mechanism of two estrogen receptors and an inhibitor

LI Long-Fei, SUN De-Fu, ZHANG Shao-Long, ZHANG Qing-Gang

J4. 2011, 24(2):  8-13. 

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       We performed 12 ns molecular dynamics simulation for estrogen receptor ERα and ERβ and inhibitor 244. We also calculated their binding free energy with the method of MMPBSA. Such energy of inhibitor 244 and receptor ERα is -30.11 kJ/mol, and the energy of inhibitor 244 and receptor ERβ is -33.32 kJ/mol. Electrostatic repulsion between Met421 side chain in of ERα and the inhibitor changes the conformation of Met421 Leu346 and Phe425. This causes bigger binding cavity and further decreases the binding of ERα and the inhibitor. Free energy decomposition calculation indicates the contribution of individual residue to the free energy.

A molecular phylogenetic analysis of the endolichenic fungi of Umbilicariales

LI Ming, WANG Hai-Ying, ZHAO Zun-Tian

J4. 2011, 24(2):  14-20. 

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        We acquired 33 melanized fungi isolated from 21 specimens of 13 Umbilicariales from China and U.S. ITS nrDNA sequences based analysis indicates that all these fungi belong to 12 Capronia species. Analysis results also show that these fungi may be constant endophytic fungi and some selections exist between them and their host fungi. Different members of the same species of endophytic fungus may colonize in identical lichen for many times. Most of these endophytic fungi are close relatives of freeliving saxicolous fungi, not the extenders of endophytic fungi in lichen.

 

Research on pollen submorphology of Lilium

YANG De-Kui

J4. 2011, 24(2):  21-23. 

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        We investigate pollen morphology of 3 species and 1 variety of Lilium L.with scanning electron microscope (SEM). Results show that these pollen grains are ellipse and monocolpate and that significant distinction exists in size and exine sculpture among different species.

Research on nutrient components of different species of Chaenomeles speciosa Nakal

ZHANG Heng, GENG Yan-Ling, WANG Dai-Jie, LIU Jian-Hua, WANG Xiao, DU Jin-Hua, LI Sheng-Bo

J4. 2011, 24(2):  24-27. 

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         We determined and analyzed protein,total sugar,total acid,pectin, vitamin,amino acids,inorganic salt and mineral elements of 14 species of Chaenomeles speciosa Nakal. The content of their total sugar is in the range of 1.3~3.5 g/100 g; the content of their amino acid is rich and can reach 0.26 g/100 g~0.50 g/100 g; the content of their vitamin C is in the range of 68.8~159.3 mg/100 g, significantly higher than other common fruits. The content of their mineral elements is richhigher kalium and lower sodium. The content of these nutrient components in Jinbao is significantly superior to the other species. Experimental results show the content of nutrient components of Chaenomeles speciosa Nakal is rich and these fruits are worth being explored and utilized, especially for Jinbao.

Isolation and identification of a carbendazim-degrading strain and its degrading characteristics

HUANG Yu-Jie, ZHANG Xin-Jian, REN Yan, LI Ji-Shun, ZHANG Guang-Zhi, YANG He-Tong

J4. 2011, 24(2):  28-34. 

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       We obtained a strain dj1-11 from carbendazimcontaminated soil, which had better carbendazim degradation function. It was identified as Rhodococcus erythropolis through physiological and biochemical identification and contrast analysis of 16S rDNA sequences. Experimental results show that trace nitrogen source adding can improve carbendazim degradation. Carbendazim can serve as its unique carbon source and degradation rate can reach 99.15% under the condition of incubation in mineral salt medium of 1000 μg/mL carbendazim , temperature 28℃ and 48h shake bed.It can effectively degrade carbendazim at the pH value of 4~9 and temperature 20~30℃ (optimal degradation temperature).

Selection and cooperative functionality of two groups of cellulose degrading microbial communities MC-1 and MC-1 with different degradation effects

ZHANG Rui-Qing, YUAN Tang-Yu, SUN Yan-Xia, LIU Ke-Ning

J4. 2011, 24(2):  35-40. 

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         We screen two groups of composite microbial systems, MC-A1 and MC-N1, with stronger cellulose degrading capabilities from homemade compost heap and several natural fermentation materials by regular regeneration during incubation. MC-A1 is a composite thermophilic aerobic cellulolytic microbial community which is acquired by a subculture technique of shakeflaskfermentation broth, while MC-N1 is another composite microbial community with thermophilic anaerobic cellulolytic capability which is obtained by static cultivation and regular regeneration. It is discovered that the degradation rates of communities MC-A1 and MC-N1 for wheatstraw powder can reach 42% and 38% within 96 h. Their quickest degradation rates occur between 48 h and 96 h, but these rates steeply decline after 96 h.This degradation rate can reach 47% by incubation of MC-A1 through 96 h shakeflaskfermentation and then incubation of MC-N1 through 96 h static cultivation. This demonstrates that these two cellulolytic microbial communities show cooperative function in the course of the degradation of nonnatural cellulose.

Research on coal mine cloud connection platform of fiber internet of things

HOU Pei-Hu, FU Xiao-Ning, WANG Ying, CHENG Zhi-Yong, NI Jia-Sheng, LIU Tong-Yu, WANG Hong-Chun

J4. 2011, 24(2):  41-46. 

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       We originally propose and design a universal interface for fiber internet of things in view of the issue of difficult fiber sensors fusion in a fiber sensor system in coal mine safety detection. We also construct a cloud connection platform for fiber internet of things with photoelectronic detection, embedded electronics and communications technology. Many optic fiber sensors can be communicated and fused by this platform, so we can construct a coal mine internet of things to improve the level of coal mine safety detection.

A new optical fiber pressure sensor for oil well application

LV Jing-Sheng, GUO Shi-Sheng, WANG Chang, YAN Bo

J4. 2011, 24(2):  47-50. 

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       Temperature and pressure are two significant reasons directly affecting oil production rate. This paper presents a new Fiber Bragg Grating (FBG) based pressure sensor for oil well application.This sensor breaks through domestic laboratory limitations for the oil well application of a pressure sensor and is quite significant for the increase of oil production rate. Its performance parameters are measurement range of greater than 50 MPa, working temperature of -20～170℃, measurement accuracy of 0.5％FS, and pressure coefficient of up to 41.92 pm/MPa after encapsulation. This sensor has such positives as online, realtime and longterm detection for the temperature and pressure in an oil well, simple structure, high measurement accuracy, intrinsic safety and easy networking.It has been applied to the Tianjin experimental well of China National Offshore Oil Corporation (CNOOC).

Application of wavelet analysis based ant colony algorithm in image edge extraction

ZHU Li-Qi, GAO Kang-Lin, GAO Ming-Jun

J4. 2011, 24(2):  51-55. 

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        Object edge, an important image characteristic, is quite significant in the processing and recognition of an image. Noise and multiple interferences overlaid in the acquisition of an image blur the edge of the image and impair the extraction effect. We therefore present an adaptive median filtering and wavelet decomposition and reconstruction based ant colony algorithm for edge extraction of an image in practice. Vast experiments show that the algorithm can well suppress noise and has better edge extraction effect.

An ontology based information retrieval approach

XING Xiao-Hui, MU Yi-Jun

J4. 2011, 24(2):  56-60. 

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       This paper presents an ontology based information retrieval model and further increases the comprehension capability of a system to a natural language document by constructing a domain ontology. This paper also introduces design and use of its three abstract layers. This paper eventually employs a polymerization function to consolidate and assess an inquiry result in order to acquire a wellmatched document with the result.

Research advances of biodiesel green production techniques

JIN Fu-Qiang, LI Yan, WANG Jian-Mei, HU Su-Qin, CAI Fei-Peng, LIU Qiang

J4. 2011, 24(2):  61-64. 

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        This paper surveys some biodiesel production techniques. We emphasize the green production technique of biodiesel. It includes heterogeneous catalyzed transesterification, supercritical fluid process, hydrodeoxygenation and its refining process oriented vacuum distillation, molecular distillation, supercritical fluid extractionfractionation, microfiliration membrane separation and ionexchange absorption. We also give some predictions on the development tendencies of biodiesel.

Complex network based reliability analysis of urban road networks

YAN Wen-Cai, ZHANG Yu-Lin, ZHAO Mao-Xian, SONG Wei

J4. 2011, 24(2):  65-70. 

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        This paper employs the method of dual topology to convert a road segment into a node and an intersection into an edge of a network (topology structure conversion of a real road network) for the importance analysis of the roads in urban road networks.We further employ such parameters as node degrees of complex networks, edge betweenness and network reliability to assess the structure characteristics of an urban road system. We eventually put this evaluation method into practice for the connection reliability analysis of Jinan urban road system under these conditions of deliberate attack and random failure.

DSP based analysis of a dualloopcontrolled inverter

KONG Xiang-Mei, REN Lan-Jie

J4. 2011, 24(2):  71-74. 

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        This paper presents a high performance controller DSP based inverter, which is a dualloopcontrolled (current and voltage loop controlled) system.Experimental results show that it has such advantages as small volume, high static accuracy and quick dynamic response.

Performance optimization approach of a 4DOF palletizing robot

LI Xiang-Dong, ZHI Jian-Bin, LIU Guang-Liang, ZHANG Yan-Fang, LIU Cheng-Ye, LI Qian

J4. 2011, 24(2):  75-77. 

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        A palletizing robot is a most commonly used robot in an automation workshop.Reasonable deployment scheme and logic control can effectively improve the performance of such a robot,and further improve the production efficiency.This paper addresses the performance optimization approach of 4DOF palletizing robot from optimal path based deployment scheme and average velocity based control.

Design of a C8051F020 based threeelectrode analysis device

GAO Guang-Heng, LI Xue-Mei, ZHENG Hui, ZHANG Li-Qun

J4. 2011, 24(2):  78-80. 

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       We design a lowcost and highprecision threeelectrode analysis device. It includes frontend analog circuit, digital circuit and PCsoftware. Its frontend analog circuit consists of TLV2262, TLV2264and ICL7650S.Chip C8051F020 performs voltage feedback control, current signal sampling and communication with PC. Experimental data of potassium ferrocyani oxidation peak show that this device is stable and can be used in similar experiments.

A PIC singlechip computer controlled leakage circuit breaker test system

WANG Xiu-Fen, ZHANG Shu-Wei, LV Bin, WU Cheng-Xuan, QU Jun-Le

J4. 2011, 24(2):  81-83. 

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        This paper presents the software and hardware design for a leakage circuit breaker test system. This system employs a resistor and an inductor as a load simulator, a PIC singlechip computer to control the connection and disconnection of a leakage circuit breaker. This system can also automatically terminate an experiment. Repetitive mechanical fatigue test shows that a circuit breaker can not be damaged and can work normally.

Analysis of possible failure and its solutions[HJ0] of an automotive electronic system

LI Yan-Qiang, LI Yang, WANG Zhi-Xue, YU Liang-Jie

J4. 2011, 24(2):  84-87. 

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         An automotive electronic system is widely applied to engine management, safety management, comfort management, information and entertainment because of the requirement of a modern car for safety,reliability, comfort and environment protection.Its safety and reliability therefore become concerned issues. This paper presents its possible failure reasons from software failure, chip failure, electromagnetic interference and manufacturing technology and some basic solutions of eliminating possible failures.