Table of Content

20 February 2012 Volume 25 Issue 1

  

Content

The condition of the block numerical range of a block operator matrix equal to its spectrum

ZHAI Fa-Hui, HAN Jie

J4. 2012, 25(1):  1-4.  doi:10.3976/j.issn.1002-4026.2012.01.001

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Let H_i（i=1,2,…,n） be unitary space. Let A be a linear operator on H=H₁⊕H₂⊕…⊕H_n with block matrix expression (［A_ij］_n×n,n≤dim H_i<∞). This paper presents a necessary and sufficient condition of the block numerical range of matrix A equal to its spectrum: a set of complex numbers λ₁,λ₂,…,λ_m,（m≤n） exist and A_ii=μ_iI（i=1,2,…,n）. Moreover, the set of all μ_i is equal to {λ₁,λ₂,…,λ_m}, and can be transformed into an upper triangular block matrix by some elementary row operations and the corresponding elementary column operations.

Research on derivative dependent global bifurcation problem

LI Pan-Pan, YAN Bao-Qiang

J4. 2012, 25(1):  5-8.  doi:10.3976/j.issn.1002-4026.2012.01.002

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We address such non-linear two-point boundary value problem as -u″(t)=f(u(t),u′(t)),0k/f₀,θ) with Rabinowitz bifurcation theorem. We allow the existence of a derivative subterm in the nonlinear term. This greatly expands the scope of the nonlinear term.

L(2,1)-labeling of the complement graphs of a class of 2-sparse graphs

LUO Jin-Mei, ZUO Lian-Cui

J4. 2012, 25(1):  9-12.  doi:10.3976/j.issn.1002-4026.2012.01.003

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This paper constructs two different island sequences of the complement graphs of a class of 2-sparse connected graphs with the hole index ρ(G)≥1

Analysis of volatile components of four species of Chaenomeles speciosa Nakai

XU Shuang-Shuang, GENG Yan-Ling, SUN Yu, ZHANG Heng, WANG Xiao

J4. 2012, 25(1):  13-18.  doi:10.3976/j.issn.1002-4026.2012.01.004

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We employed headspace solid phase microextraction (SPME) and GC-MS to analyze the volatile components of four different species of Chaenomeles speciosa Nakai. We also investigated the effects of different SPME fibers and extraction positions on extraction results. Experimental results show that 65 μm PDMS/DVB fiber exhibits better extraction result.The pericarp and flesh of different positions have not significant influence on their volatile components. We further employed peak area normalization method to determine the relative content of each volatile component. We identified 60 volatile components, which mainly included esters, alkanes and alkenes whose total content exceeded 90%. The varieties and relative contents of the volatile components of these Chaenomeles speciosa Nakai were different. This method is rapid and accurate, so it can provide reference for further development and utilization of Chaenomeles speciosa Nakai resources.

Fast determination of maize starch content in cornflour

YU Lu-Hao, YANG Jun-Hui, MENG Qing-Jun, YANG Yan, MA Yao-Hong

J4. 2012, 25(1):  19-23.  doi:10.3976/j.issn.1002-4026.2012.01.005

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        This paper employs phenol-sulfuric acid, DNS and reducing sugar analyzer methods to determine the starch content in cornflour. We comprehensively compare their operation processes and the acquired data. Results show that reducing sugar analyzer method can determine maize starch content more conveniently and rapidly.

Mycelial growth of fermentation medium of white Hypsizigus marmoreus and the optimization of exopolysaccharides medium

FANG Lu, QI Qiu-Yue, LI Bin, JIA Ze-Feng

J4. 2012, 25(1):  24-31.  doi:10.3976/j.issn.1002-4026.2012.01.006

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The optimum liquid medium of white  Hypsizigus marmoreus can provide the fundamental data for its extensive cultivation. We optimized fermentation medium with L₉(3⁴) orthogonal test, the main ingredients of glucose, yeast powder, KH₂PO₄ and MgSO₄, and exopolysaccharides content and mycelial biomass as test indexes. We also separated mycelia by extraction and filtering, dried and weighted them, and calculated their biomass. Phenol sulfuric acid was then employed to determine the content of exopolysaccharides. Weighted evaluation of exopolysaccharides content and mycelial biomass shows that the optimum liquid medium is composed of glucose of 3%, yeast powder of 0.15%, KH₂PO₄ of 0.30% and MgSO₄ of 0.20%.

Research on biological characteristics and genetic diversity of rhizobia of Glycine soja in the Yellow River Delta

QI Wen-Jing, HE Dong-Hua, XIA Zhi-Jie, DAI Mei-Xue

J4. 2012, 25(1):  32-37.  doi:10.3976/j.issn.1002-4026.2012.01.007

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Wild soybeans (Glycine soja) have such positive characteristics as salinealkali resistance, cold tolerance and disease resistance, so they play a significant role in the research on soybean gene evolution and the improvement of soybean quality and yield. We collected 227 wild soybeans from 26 sites of 14 rural towns in the Yellow River Delta, and isolated and purified rhizobia strains from wild soybean nodules. We then performed physiological and biochemical experiments, stress tolerance experiments, nodulation ability determination, nodulation wide spectrum analysis, 16S rDNA sequence determination and RAPD analysis. We isolated and purified 100 rhizobia strains from Glycine soja. Strains 3D-21, 3D-24, 3K-8 and 3K-23VS had strong tolerance against acid, alkali, salt, antibiotics, high and low temperature and stronger nodulation capability. Strain 7K-8 had stronger nodulation capability and strain K-5 had stronger stress tolerance capability. 16S rDNA sequence analysis shows that all the isolated strains belong to 3 genera and 7 species, and that RAPD analysis of similar strains exhibits obvious polymorphism. Results indicate that rich diversity exists in the rhizobia of wild soybean in the Yellow River Delta. Some strains have strong nodulation ability and/or stress tolerance ability. This research lays a foundation for the excavation and utilization of better strain resources.

The microbial communities in anaerobic granular sludge and their research advances

ZHANG Qiang, CHEN Cheng-Cheng, LIU Tong-Jun, CHEN Guan-Hong, PEI Zhen-Hong

J4. 2012, 25(1):  38-43.  doi:10.3976/j.issn.1002-4026.2012.01.008

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        Anaerobic granular sludge is a definitive factor in anaerobic effluent treatment. This paper addresses the main microbial communities in anaerobic granular sludge, especially the methanogen community. This paper also surveys the application of such modern molecular biotechnology as FISH, RTPCR, DGGE, 16S rRNA and T-RFLP in the research of microbial communities of anaerobic granular sludge. We eventually present the development prospect for the formation of the granular sludge, its growth process and the regulation of microbial communities in granular sludge.

Comparisons of mineral element contents of different organs of different species of  Trichosanthes kirilowii  Maxim

LIU Wei, FANG Lei, WANG Xiao, LI Jing-Chao, MA Zhi-Liang, ZHANG Yong-Qing

J4. 2012, 25(1):  44-46.  doi:10.3976/j.issn.1002-4026.2012.01.009

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        We determined the contents of such mineral elements as Ca, Mg, Fe, Mn, Cu and Zn in different organs of  Trichosanthes  kirilowii  Maxim, a Shandong local medicine. We also addressed the mineral element contents of snakegourd roots from two different sexes. Results show that there is no significant difference for mineral element contents in their skins and seeds, but the distinction exists in the distribution of mineral elements. Calcium content is 0.25%~0.28% in the skin, and 0.1% in the seed. However, the content of other mineral elements are higher in the seed. Moreover, the mineral element contents of female snakegourd root are higher than those of male snakegourd root, which indicates that female snakegourd root has higher capability to absorb and preserve mineral elements.

Research on principle component analysis based pharmacological effect  evaluation method for a kind of Chinese herbal medicine, Baikal skullcap root

CHENG Wei, HOU En-Guang, LI Ke, LI Shu-Bin, ZHAO Bo-Nian, XU Zong-Yuan

J4. 2012, 25(1):  47-50.  doi:10.3976/j.issn.1002-4026.2012.01.010

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       We employ the algorithm of principal component analysis (PCA) to process the acquired chromatographic  fingerprint and inhibitory rate by dimensionality reduction to realize chromatographic fingerprint and pharmacological effect correlation mode based comprehensive quality evaluation for Baikal skullcap root. Test results demonstrate its advances and higher reliability. This method provides us a new and referable idea for the quality evaluation of traditional Chinese herbal medicine.

Effects of Al-Ti-C-B master alloy on the microstructure and mechanical properties of high aluminum zinc based alloy

TIAN Chang-Wen

J4. 2012, 25(1):  51-55.  doi:10.3976/j.issn.1002-4026.2012.01.011

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             This paper addressed the effects of Al6.53Ti0.3C0.46B master alloy (Ti∶[KG-*2]C＞4∶[KG-*2]1) on the microstructure and mechanical properties of high aluminumzincbased alloy. Experimental results show that the addition of the master alloy can significantly refine the microstructure of the high aluminum zinc based alloy. The shape of a primary α phase grain changes from coarse dendrite into fine and uniform equiaxed crystal. The average size of equiaxed crystal is 30~50 μm. The extension rate of the alloy increases from 1.7% to 10.0% and the tensile strength is about 410 MPa in the condition of sand casting (SC). The extension rate of the alloy increases from 1.0% to 16.0% and the tensile strength is about 407 MPa  in the condition of permanent mold casting (PMC). Its tensile strength does not significantly increase though its microstructure is obviously refined. Its refinement mechanism is the increase of heterogeneous nucleus due to the addition of Al-Ti-C-B master alloy.

Effects of austempering on residual austenite content of dual phase ADI

JIANG Li-Kun, LIU Yun-Teng, TIAN Chang-Wen, ZHAO De-Gang, LI Wei-Hong, ZHOU Ji-Xue, ZHAN Cheng-Wei

J4. 2012, 25(1):  56-58.  doi:10.3976/j.issn.1002-4026.2012.01.012

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        The residual austenite has significant influence on the mechanical properties of Dual Phase Austempered Ductile Iron (ADI). We address the effects of austenitizing temperature on the content of retained austenite in ADI with X-ray method to investigate the relationship between process, organization and performance. Results show that the content of retained austenite gradually increases with the increase of austenitizing temperature.

Hardware design of ARM9 based sea floor observatory network node circuit

LV Bin, DU Li-Bin, HE Hai-Jing, QU Jun-Le, WANG Xiu-Fen

J4. 2012, 25(1):  59-64.  doi:10.3976/j.issn.1002-4026.2012.01.013

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       The paper devises a control system for ARM9 based sea floor observatory network node circuit to satisfy the real time  acquisition requirement of submarine observation data. This system employs the modular design method of an embedded system to construct a circuit system including extended UART communications circuit, analog to digital conversion circuit, ethernet communications circuit, voltage level conversion circuit and USB interface circuit. Simulation and application results prove that this node circuit system has better stability and reliability, and easy to be monitored and maintained by a shore station.

CFD based flow field analysis of a seabed monitoring platform

LIU Jie, TUN Cheng-Xuan, LV Bin, LI Zheng-Bao

J4. 2012, 25(1):  65-68.  doi:10.3976/j.issn.1002-4026.2012.01.014

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       We employed computational fluid dynamics (CFD) to numerically simulate the flow field surrounding a seabed monitoring platform. We also employed a software, FLUENT, to construct a CFD model for the flow field, and performed its mesh division and determination of its boundary conditions based on the external structure of the seabed monitoring platform. We further analyzed the numerical simulated results of the velocity and pressure field of the outside sea current of the platform. This research can provide a reference for the structure design and improvement of a seabed monitoring platform, and can lay foundation for the thorough research.

A robot tool frame calibration method

LIU Cheng-Ye, LI Wen-Guang, MA Shi-Guo, ZHI Jian-Bin, LIU Guang-Liang, WU Hao

J4. 2012, 25(1):  69-74.  doi:10.3976/j.issn.1002-4026.2012.01.015

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        We present a simple and effective calibration method for robot tool frame calibration. This method is based on the kinematic computation of a stacking robot, and recognizes the relative position of the tool frame to the end of the robot without the aid of extra measurement equipment. The method then recognizes the orientation of the robot tool frame based on the derived relative position. This method only employs the linear least square algorithm, so it is easy to be realized. We employ MATLAB and Virtual Robot Simulator to simulate the proposed method. Results show that the method is feasible and can be applied to practical environments to reduce the offline time and improve the level of automation.

A practical intelligent alarm prediction and processing system

KONG Fan-Ping, ZHANG Yuan-Yuan, LIU Xiang-Yang, JIANG Shu-Ming, WANG Lei

J4. 2012, 25(1):  75-80.  doi:10.3976/ j.issn.1002-4026.2012.01.016

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      We developed a practical intelligent alarm prediction and processing system in view of some negatives of a  traditional  security and protection system (SPS). This system can achieve realtime prediction for the intruder path of a surveillance object and alarm transmission in advance.The system can also automatically choose an optimum alarm processing strategy based on police distribution, alarm emergency priority and the risk control mechanism of a protection object, and then make active defense. The system can be applied to many regional SPS and improve the intelligent level of a SPS.

Real time database of a vehicleborne embedded remote surveillance system

WANG Shuai, LIU Lei, SUN Ming-Shan, LIU Xiang-Yang

J4. 2012, 25(1):  81-86.  doi:10.3976/j.issn.1002-4026.2012.01.017

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      We employ a Linux based embedded database to implement realtime data collection, remote access and maintenance in a vehicle borne remote surveillance system. This paper transplants embedded Web Server BOA and  embedded  database SQLite onto the platform, S3C2440. This paper also addresses the application of SQLite in real time data collection with a serial communications program as an example.

A virtual machine technology based construction model for a university laboratory

TIAN Gao-Cheng, YANG Feng

J4. 2012, 25(1):  87-91.  doi:10.3976/j.issn.1002-4026.2012.01.018

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       This paper presents a user oriented construction model for a university laboratory. We employ Vmware virtualization technology and this model to construct a new laboratory based on the original laboratory equipments. An  analysis shows that a model based laboratory construction has such advantages as low cost, lowcarbon emission and better performance.

Design of a motion control card based automatic optical source localization system

ZHANG Yan-Bo, XIE Zhao-Yan, GE Zhao-Bin, WANG Zhong-Min, SONG Sen-Sen

J4. 2012, 25(1):  92-95.  doi:10.3976/j.issn.1002-4026.2012.01.019

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       We developed an automatic optical source localization system with an industrial computer as a development platform, a motion control card as a systematic structure and Visual C++6.0 as a development language. Practice shows that the system has such advantages as high accuracy of 0.1 mm, higher reliability and better performance.

Symbian S60V5 operating system based application software for an off grid photovoltaic power system

YANG Gui-Hong, CHEN Ji-Wen, WANG Dong-Mei, HAN Wen-Dong, CHE Jin-Feng

J4. 2012, 25(1):  96-98.  doi:10.3976/j.issn.1002-4026.2012.01.020

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     We developed a Symbian S60V5 operating system based smartphone application software to facilitate  parameters  calculation of an off grid photovoltaic power system. It can implement on site rapid calculation for the parameters of an off grid photovoltaic power system.

Performance analysis of balcony hanging flat panel solar water heaters

GAO Li-Feng, SUN Yi-Xia, ZHANG Min, HE Mao-Tao, YANG Rong-Kun

J4. 2012, 25(1):  99-102.  doi:10.3976/j.issn.1002-4026.2012.01.021

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       We perform comparative tests for vertical and horizontal flow solar collectors. We further calculate and  comparatively analyze the heat performance of these two water heaters. Results show that the horizontal flat panel solar water heater is superior to the vertical one in instantaneous efficiency, average daily efficiency,  daily useful energy and warming performance.

Application of supramolecular inclusion technique in pharmaceutical development

ZHAO Mei, WANG Xiao-Dong, WANG Xiao, ZHANG Li-Li, LI En-Xia

J4. 2012, 25(1):  103-107.  doi:10.3976/j.issn.1002-4026.2012.01.022

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        In pharmaceutical research,the supramolecular inclusion hosts include crown ether, cyclodextrin, calixarene and cucurbituril. They all have cavity structure and can form supermolecules with other ions and neutral molecules by the noncovalent bonds,which can improve medical stability. This paper surveys application advances of these supramolecular hosts in the pharmaceutical development.It also presents the application prospect of supramolecular inclusion technique in new medicine development.