Table of Content

20 April 2012 Volume 25 Issue 2

  

Content

Neighborhood conditions of maximally local edge connected and super local edge connected bipartite digraphs

GAO Jing-Zhen, SHAO Guang-Feng

J4. 2012, 25(2):  1-7.  doi:10.3976/j.issn.1002-4026.2012.02.001

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We prove that a n-order bipartite digraph D is maximally local-edge-connected if the minimum degree δ≥3 and min (N+(x)∪N+(y)|，|N-(x)∪N-(y)|}≥(n+3)/4 for each pair of vertices x and y  in the same part, and is super-edge-connected if δ≥4 and min{N⁺(x)∪N⁺(y)|,|N^-(x)∪N^-(y)|}>(n/4)+1 for each pair of vertices and y in the same part. We also prove that the best possibility of the conditions and the independence of the results  from the primitive ones.

The uniqueness of the C［0，1］ positive solution of the two-point boundary value problem of the sublinear Emden-Fowler equations

LIU Bing, YAN Bao-Jiang

J4. 2012, 25(2):  8-11.  doi:10.3976/j.issn.1002-4026.2012.02.002

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       Two-point boundary value problem of the sublinear Emden-Fowler equations has been addressed in many literatures, but the uniqueness of the C［0，1］ positive solution has not been investigated. We employ monotone iterative method to address such problem and derive the uniqueness of the C［0，1］ positive solution of the boundary value problem of such equations.

Existence of positive solutions of third-order nonlinear semipositone differential equations with integral boundary value conditions

YU Kang, LIU Yan-Sheng

J4. 2012, 25(2):  12-16.  doi:10.3976/j.issn.1002-4026.2012.02.003

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We address the existence of positive solutions of third-order semipositone differential equations with integral boundary value conditions by fixed point theorem of cone extension and compression.

Oscillation criteria of third-order nonlinear dynamic equations on a time scale

WANG Jun-Jun, YAN Lei

J4. 2012, 25(2):  17-19.  doi:10.3976/j.issn.1002-4026.2012.02.004

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We present the oscillation criteria of third-order nonlinear neutral dynamic equations on a time scale  T. We also generalize some known oscillation results of third-order equations.

Molecular dynamics analysis of allosteric inhibitor system of HIV-1 protease

SUN De-Fu, WANG Jia-Lei, ZHANG Shao-Long, ZHANG Qiang-Gang, ZHANG Yi-Ci

J4. 2012, 25(2):  20-25.  doi:10.3976/j.issn.1002-4026.2012.02.005

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We performed 8 ns of molecular dynamics simulation for the allosteric inhibitor and active site inhibitor system of HIV-1 protease. We also calculated their binding free energy with MM-PBSA. The free energy of inhibitor binding to protease is -90.30 kcal/mol in allosteric inhibitor system and the energy is -59.58 kcal/mol in active site inhibitor system. Molecular fragment 4DX stuck at protease exo site reduces the scope of residue activities near the active site in allosteric inhibitor system. It has favorable effect on the binding of inhibitor. Allosteric inhibitor makes a system more rigid and stable and the inhibitor binding to protease more firm.

Identification of  Glehnia littoralis  by ¹³CNMR fingerprint

LIU Jing, Dan Staerk, SUN Qing-Lei, LI En-Xia, ZHAO Mei, MA Guang-Cun, JIANG Ting, LV Rui-Min

J4. 2012, 25(2):  26-29.  doi:10.3976/j.issn.1002-4026.2012.02.006

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      We employed a universial extract approach to obtain Glehnia littoralis extracts reflecting the their total characteristics. We further applied a Fourier transform nuclear magnetic resonance spectrometer to determine the Carbon-13  Nuclear Magnetic Resonance (¹³CNMR) fingerprints of different Glehnia littoralis extracts and calculated their similarities with vectorial angle method. Results show that the resonant peaks of many components exist in the fingerprints of different Glehnia littoralis extracts. The characteristic resonant peaks of their active components exhibit better repeatability and characteristics. A joint analysis of ¹³CNMR fingerprints and their characteristic peaks would provide an identification basis for Glehnia littoralis.

Determination of Se content in wild boar meat with atomic fluorescence spectrometry

CHENG Yan, LIU Jing, ZHAO Chang-Cheng, LI Jing-Chao

J4. 2012, 25(2):  30-32.  doi:10.3976/j.issn.1002-4026.2012.02.007

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      We employed an atomic fluorescence spectrometer with wet digestion to determine  Se content in wild boar meat. Its recovery rate is 96.1 %~103.6 %, and its relative standard deviation is 3.02 %. Results show that Se content in wild boar meat is 1.3 times more than that in domestic pork, and several dozens times more than that in fresh vegetables and fruits. This provides a simple and reliable approach for determining the trace elements in wild boar meat and a scientific basis for fostering Se rich wild boars.

Analysis of water pollution caused by the development of three industries in Nansi Lake basin

PENG Li-Min, YAN Zhong-Yue, SHAO Bo, ZHAO Jian-Jian

J4. 2012, 25(2):  33-37.  doi:10.3976/j.issn.1002-4026.2012.02.008

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        We selected the higher pertinent and quantifiable parameters and regression modeling analysis to address the development trend of water pollution caused by three different industries in Nansi Lake basin. Analysis shows that water pollution is significantly reduced in the secondary industry due to the strict control over pollutant. Reduction of water pollution  is not obvious in primary and tertiary industries due to the lack of strict government control. We present some policies and suggestions, taking the water pollution government in Nasi Lake basin as an example.

Individual and combined toxicity of Cu²⁺, Cd²⁺ and Se⁴⁺ to Daphnia magna

DONG Xiao-Xiao, LIU Teng-Teng, KONG Qiang, LU Jiang, FU Rong-Shu

J4. 2012, 25(2):  38-43.  doi:10.3976/j.issn.1002-4026.2012.02.009

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         We addressed the individual and combined toxicity of Cu²⁺, Cd²⁺ and Se⁴⁺ to Daphnia magna with a static test method. We also employed additive index method to evaluate their combined toxicity. Individual toxicity experiment shows that the toxicity of Cu²⁺, Cd²⁺ and Se⁴⁺ is degressive. Combined toxicity experiment shows that complex toxicity effect exhibits for different concentration ratios of Cu²⁺, Cd²⁺ and Se⁴⁺. Especially, the combined toxicity effect changed from antagonistic response to synergistic response with the increase of exposure time for equal concentration ratio of Cu²⁺ and Cd²⁺.

Design of the mooring system of SBF3-2 wave buoy

SUN Jin-Wei, ZHENG Shan-Shan, FAN Xiu-Tao, QI Yong, WAN Xiao-Zheng, LI Xuan-Qun

J4. 2012, 25(2):  44-48.  doi:10.3976/j.issn.1002-4026.2012.02.010

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         The horizontal mooring system of SBF3-2 wave buoy includes an anchor, a chain, two nylon wires and a surface pontoon, in which the mooring line connected the buoy always keep horizontal. We employed multi segment  catenary  theory to calculate its line tensions and catenary shape. Analysis results show that this mooring system is available for the sea area of high current velocity. It can improve its wave following, and also anti overturn performance and the measurment accuracy.

A long term water quality monitoring system embedded in a large buoy

LIU Hai-Feng, DONG Da-Sheng, ZHANG Shu-Wei, FAN Xiu-Tao, CHENG Qun, LIU Shi-Xuan, LI Min

J4. 2012, 25(2):  49-52.  doi:10.3976/j.issn.1002-4026.2012.02.011

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          This paper presents a new ocean environment continuous monitoring system to solve marine biofouling problem and to increase the lifetime of oceanographic instrumentations. The system is embedded in a large ocean data buoy and pumps seawater into a container to measure data with seawater sampling method. The system then washes the container and sensors with disinfectant and fresh water. The monitoring data is transmitted to a onshore control center and compared with that of the common instrumentations. Experiments show that the system can extend the lifetime of a water quality  sensor  to at least one year and improve its long term accuracy and reliability.

A Wide dynamic range highspeed receiving circuit applied to a pulse laser rangefinder

WANG Qiang, SUN Zhi-Hui, NI Jia-Sheng, LIU Yong-Ning, ZHANG Yan, WEI Wei, CHANG Jun

J4. 2012, 25(2):  53-58.  doi:10.3976/j.issn.1002-4026.2012.02.012

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        We design a receiving circuit for a pulse laser rangefinder with the control over bias voltage of APD and  amplifier  gain to improve its range accuracy. Simulation results show that the circuit can receive greater echo power of  dynamic  range of 80 dB and implement output voltage of 0.5~2 V and valid bandwidth of 58 MHz. Test results  demonstrate  that the design is feasible.

A survey of security architecture of ZigBee protocol stack

HUANG Tai-Bo, ZHAO Hua-Wei, PAN Jin-Qiu, NIE Pei-Yao, YANG Ze-Jun

J4. 2012, 25(2):  59-66.  doi:10.3976/j.issn.1002-4026.2012.02.013

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         ZigBee, an emerging wireless sensor network technology, has wide application and its security is increasingly significant. This paper presents its security architecture, security service, security model, security components, security keys and trust center and security policy of each layer. The paper also gives its security implementation steps. The paper eventually proposes a new idea for its key management, which is favorable to its security enhancement.

Research on the properties of diamond like carbon films prepared on magnesium alloy substrate

LI Qing-Gang, LUO Qing-Li, WANG Xiu-Chun, LUO Qing-Gang

J4. 2012, 25(2):  67-71.  doi:10.3976/j.issn.1002-4026.2012.02.014

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         We employed the new technology of chromium free chemical conversion surface treatment and plasma  enhanced  chemical vapor deposition (PECVD) to prepare diamond like carbon (DLC) films by two steps. We initially formed a porous structure on Mg alloy substrate and took a high adhesion film as the transitional layer. We further employed PECVD technology to prepare DLC films with Si-DLC. Scanning electron microscope and Raman spectroscopy demonstrate that the films are uniform, smooth and compact, and composed of layered compounds of C, Si and H. The films also have the same characteristics as DLC. Observation through an atomic force microscope (AFM) shows that  Si-DLC films are more compact than un-doping Si-DLC films. Si-DLC films are the most compact and completely cover the chemical conversion coating. Performance test shows that the intermediate layer between chemical conversion coating and Si-DLC film significantly improves the bond strength between Mg alloy substrate and DLC film. The intermediate layer also dramatically improves wear resistance, high temperature resistance and corrosion resistance capabilities of Mg alloy.

Design of a high precision temperature measurement circuit

LIU Meng-De, HE Hai-Jing, DU Li-Bing

J4. 2012, 25(2):  72-75.  doi:10.3976/j.issn.1002-4026.2012.02.015

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       We design a high precision temperature measurement circuit excited by a constant current source with RTD and thermistor commonly employed in ocean environment detection. We also reduce the measurement error caused by current variation and self heating. Scene test shows that the circuit satisfies the requirement of ocean environment  detection.

Design of the temperature measurement and control system of a rubber extruder

LI Xiang-Rong, YU Yang

J4. 2012, 25(2):  76-79.  doi:10.3976/j.issn.1002-4026.2012.02.016

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       We designed a temperature measurement and control system for rubber production. We employed pulse  interference suppression average filtering approach based on average filtering and median filtering to process temperature data in a temperature data collection and processing module. We used an integral separation PID algorithm in its output. Experiment shows that the system has high stability, short temperature adjustment time,and a control accuracy of 0.5℃ for a temperature signal.

Application of SQLite in an embedded fiber Bragg grating system

ZHAO Lin, MIN Li, LI Shu-Juan

J4. 2012, 25(2):  80-82.  doi:10.3976/j.issn.1002-4026.2012.02.017

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     We explain SQLite encapsulation steps from open source database code to callable dynamic link library object with realistic examples for satisfying the requirements of portable temperature measurement of high voltage switch cabinet and fiber Bragg grating sensing technology. We also implement an embedded fiber Bragg grating system with SQLite. Test results show that SQLite exhibits better performance in embedded database query and memory  occupation.

A capacitive sensor based fuel level measurement approach for a lorry

WANG Chun-Yan

J4. 2012, 25(2):  83-86.  doi:10.3976/j.issn.1002-4026.2012.02.018

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     We presented a capacitive sensor based fuel level measurement approach to compensate the defect of  traditional  float variable resistor measurement approach. It detects fuel level based on the better linear relationship between fuel level and the capacitance of a capacitive sensor. Experimental results show that better linear relationship exists between  fuel level and the capacitance of a capacitive sensor, less than ±5% measurement error. It has such benefits as less power consumption and long lifetime.

 A novel high accuracy dynamic weighing system

JIANG Jing-Sai, LI Chun-Jie

J4. 2012, 25(2):  87-91.  doi:10.3976/j.issn.1002-4026.2012.02.019

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 We design a μC/OS-II based vehicle dynamic weighing system. It can detect vehicle direction through two pairs of pressure sensors and effectively reduce the weighing error caused by sensor nonlinearity and vehicle speed. The system can also rapidly and accurately weight vehicles, perform realtime calculation, storage and display, and be easily controlled on demand. Weighing experiment shows that the system is accurate and reliable, as compared with other weighing systems.

Design of monitoring software for PLC in an eddy current test system

MENG Ling-Hua, LIU Pin-Xiao, MA Jian, DONG Xin, ZHAO Hong-Xian

J4. 2012, 25(2):  92-95.  doi:10.3976/j.issn.1002-4026.2012.02.020

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         We developed a PLC host monitoring software kit with Visual Basic as a platform and realized the  communications between a PC and a PLC. The monitoring software is also applied to an eddy current test system. It has better humancomputer interaction and can update information promptly.

A PLC based domestic appliance performance test manipulator and its control system

LIU Jie, TUN Cheng-Xuan, QU Jun-Le, WANG Xiu-Fen

J4. 2012, 25(2):  96-98.  doi:10.3976/j.issn.1002-4026.2012.02.021

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       We devise a PLC based domestic appliance performance test manipulator and its control scheme to improve the efficiency and accuracy of hinge fatigue endurance test of domestic appliance door. We also present its hardware and software design scheme. Realistic test results show that the manipulator is stable and reliable.