Journal of Hebei University(Natural Science Edition)

Analysis of Ground Movements Due to Shallow Tunnel Excavation in Soft Soil Strata

LI Wen-xiu,YANG Chang-min,ZHENG Xiao-ping,WEN Lei,LIU Xiao-min

2009, 29(6): 561-563. DOI: 10.3969/j.issn.1000-1565.2009.06.001

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The two-dimensional elastic model for the analysis of the ground surface subsidence due to shallow tunnel excavation is established based on elastic mechanics theory. And the theoretical formula of ground surface subsidence due to shallow tunnel excavation in soft soil strata is given and is applied to the analysis of ground subsidence due to shallow tunnel excavation in soft soil strata. The Matlab is used to solve the calculation of the numerical integration and drawing of the figure in the course of the analysis. The agreement of the theoretical results with the field measurements shows that the model is satisfactory.

New Characters and Applications of E-quasiconvex Functions

PENG Zai-yun,LIN Zhi,LIU Ya-wei

2009, 29(6): 564-566,569. DOI: 10.3969/j.issn.1000-1565.2009.06.002

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A class of important generalized convex functions-E-quasiconvex function is futher discussed in this paper. First,an important example is given in part one, which show that E-quasiconvex functions is exist. Secondly, some new characters and two criteria of E-quasiconvex functions are given.Thirdly, two results for the extremum problemwhich the objective function is E-quasiconvex function are presented.

Properties of Subideals of 3-Lie Algebras

BAI Rui-pu,WEI Ji-qing

2009, 29(6): 567-569. DOI: 10.3969/j.issn.1000-1565.2009.06.003

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The paper mainly concerns subideals of 3-Lie algebras. The solvability and nilpotency of subideals of 3-Lie algebras are studied. And the relation theorem on the derived series of 3-Lie algebras and the derived series of subideals is proved.

Generating Function with the Random Walk Model

ZHANG Guo-chun,WANG Liang,CHEN Ya-ting

2009, 29(6): 570-573,590. DOI: 10.3969/j.issn.1000-1565.2009.06.004

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A special model of random walk with bilateral absorbent boundaries on the plane is studied, and the generating function is used in the model. By the generating function, the formula for computing the probability which the point reaches the absorbent boundaries in special case is presented.

Multi-point Boundary Value Problems for Second-order Differential Equations in Banach Spaces

ZHANG Hong-ye

2009, 29(6): 574-576. DOI: 10.3969/j.issn.1000-1565.2009.06.005

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By using the Sadovskii fixed point theorem, the second-order multi-point boundary value problem in a Banach space is studied.The sufficient condition for existence of at least one solution is obtained.

Amendment to the Multiferroic Landau Model of BiFeO_3

WANG Ying-long,WANG Xing-yuan,DING Xue-cheng,LIANG Wei-hua,DENG Ze-chao,CHU Li-zhi,FU Guang-sheng

2009, 29(6): 577-581. DOI: 10.3969/j.issn.1000-1565.2009.06.006

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Considering both Landau free energy at thermodynamic equilibrium state should be stable and every order parameter should be real in extensive Landau-type phenomenological theory, we have obtained Landau expansion coefficients of BiFeO_3 materials. The magnetization hysteresis loop, polarization hysteresis loop, and the magnetic field dependence of the magnetoelectric coefficient are calculated, which are in good agreement with experimental data reported in previous literatures.

Growth of Silicon Nanowires via Vapor-Liquid-Solid Mechanism and Its Structural Characteristics

BAI Zhen-hua,FAN Zhi-dong,CHENG Xu,PENG Ying-cai

2009, 29(6): 582-586. DOI: 10.3969/j.issn.1000-1565.2009.06.007

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Silicon nanowires were synthesized on n-Si (111) substrates using Au film as catalyst and SiH4 gas as a vapor phase reactant based on vapor-liquid-solid mechanism. The measurement of scanning electron microscopy shows that their diameters mainly range from 20～200 nm and their lengths are from several micrometers to dozens of micrometers. The composition is measured with energy-dispersive X-ray spectrometry. The effects of the growth temperature, SiH_4 flow rate ,thickness of Au film and growth time on the formation and structures of Si nanowires were discussed.

Quantum Effect in the Mesoscopic RLC Circuits

DING Zhen-jun,MA Jin-ying,YAN Zhan-yuan,GU Lian-zhong

2009, 29(6): 587-590. DOI: 10.3969/j.issn.1000-1565.2009.06.008

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A series of heat sensitive crosslinked P(MMA-CO-BA) microcapsules were synthesized by emulsion polymerization with leucocompound as a core material and crosslinked P(MMA-CO-BA) as a wall material. The microcapsules with different glass-transition temperatures were obtained by changing the BA mass fraction in the monomer. The size distribution, surface morphology, thermal stability and glass-transition temperature(t_g) of the resultant microcapsules were characterized using Malvern particle size analysis, scanning electron microscopy(SEM), thermo-gravimetric analysis(TG) and differential scanning calorimetry(DSC), respectively. The results indicated that the microcapsules showed higher thermal stabilities. The microcapsules with smooth surface and spherical shape were prepared at different BA mass fractions. The mean particle size of the prepared microcapsules decreased with the increasing BA mass fraction in the monomer. t_g of the microcapsules were 115.0,110.3 and 94.3 ℃ when BA mass fractions were 5.0%, 10.0% and 15.0%, respectively.

Dangling Chains in the Polycondensation Reaction of A_a-B_bC_c Type

YAO Ning,LI Yuan-feng,SONG Jian-min,WANG Yun-ming

2009, 29(6): 605-608. DOI: 10.3969/j.issn.1000-1565.2009.06.012

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For the gel network formed in the polycondensation of A_a-B_bC_c type, two different methods are proposed to calculate the number of dangling chains. The corresponding numerical results are also presented by taking the A_4-B_2C_2 reaction system as an example. It is shown that at a low conversion, the dandling chains display mainly the treelike structure with many branched chains, but these branched chains decrease at a high conversion. The present result can provide a possible clue for understanding the viscoelastic properties of polymer gel material.

Preparation of Orange-red Emitting Phosphors Sr_2MgSi_3O_9:Eu~(3+) for White LEDs and Its Photoluminescent Properties

ZHAI Yong-qing,FENG Shi-hua,ZHANG Zhang,NIU Qiang

2009, 29(6): 609-613. DOI: 10.3969/j.issn.1000-1565.2009.06.013

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Novel phosphors Sr_2MgSi_3O_9:Eu~(3+) synthesized by gel-combustion method in weak reductive environment.The as-synthesized phosphors were investigated by XRD, SEM and Fluorescence spectrophotometer. The results show that Sr_2MgSi_3O_9: Eu~(3+) phosphor possesses the similar tetragonal crystal structure as that of Sr_2MgSi_2O_7. The initial particles of as-synthesized phosphors are nearly spherical in shape, and the particle size is about 100 nm in diameter. The excitation spectrum of Sr_2MgSi_3O_9:Eu~(3+) sample presents wide band absorption between 220～300 nm, which is ascribed to the charge transfer between Eu~(3+)-O~(2-). The sharp peaks after 300 nm belong to f→f transition of Eu~(3+), and the strongest sharp peak is located at 400 nm, which is ascribed to the transition from the ground state of Eu~(3+) to ~5L_6 excited state. Therefore, samples can be efficiently excited by ultraviolet radiation from InGaN chip. The emission spectrum consists of two emission peaks at 592 nm and 618 nm, which are ascribed to ~5D_0→~7F_1 and ~5D_0→~7F_2 respectively. Moreover, it is found that co-doped Ti~(4+) with the proper content can make the emitting colour shift from orange-red to red, and improve intensity of luminescence effectively.

Separation and Analysis of Thiadiazole in Cefazolin Sodium

HA Jing,BIAO Ya-nan,ZHANG Ya-li,LIU Yang,ZHAO Xian-ping

2009, 29(6): 614-617. DOI: 10.3969/j.issn.1000-1565.2009.06.014

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The impurity thiadiazole was separated from cefazolin sodium by chemical method, and the separated thiadiazole was identified using thin layer chromatography(TLC), high performance liquid chromatography(HPLC) and infrared absorption spectroscopy(IR) method;The residue of thiadiazole in cefazolin sodium was detected according to the relative retention time;The content of thiadiazole in cefazolin sodium was calculated through peak area ratio between its area in test solution and cefazolin sodium area in 1.0 % reference solution according to European Pharmacopoeia.The results shown that the separated thiadiazole was residual raw material. The proposed method was suitable for the qualitative and quantitative analysis of the residual thiadiazole in cefazolin sodium.The method has been applied to the determination of thiadiazole in several samples and the results show that the contents comply with security specification(not more than 1.0 %).

Paal-Knorr Condensation for the Synthesis of Pyrrole Derivatives Under Ultrasound Irradiation

ZHANG Shu-wen,ZHANG Xing,WEI Bao-jun,HAO Peng-peng

2009, 29(6): 618-622. DOI: 10.3969/j.issn.1000-1565.2009.06.015

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Polysubstituted pyrroles were synthesized via ultrasonic-assisted Paal-Knorr condensation of 1,4-diketone with aromatic amines at room temperature. Compared with conventional heating method, the ultrasonic-assisted reaction showed certain practical value for it's higher yield, shorter reaction time, mild reaction condition, simple procedure and so on.

Method of Removal the Remaining Active Ingredient Oxytetracycline Residue

SUN Hong-li,LIU Zhi-qin,WANG Jun,YAN Zheng

2009, 29(6): 623-626. DOI: 10.3969/j.issn.1000-1565.2009.06.016

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The effective method of removal the remaining active ingredient in oxytetracycline residues is studied. The influence of hydrochloride acid, calcium oxide, methanol and heating temperature on the removal of the remaining ingredient in oxytetracycline residue is investigated. In the process, the residue is firstly immersed by 2.0 mol/L HCl with mechanical stirring in a water bath of 95 ℃, and then it is cooled to room temperature accompany with adding methanol, mechanical stirring and leaching reaction solution. The filter residue is mixed by adding distilled water, adjusting the pH to 5.0 by CaO, stirring in a water bath of 95 ℃ and filtering, and then the filter residue is dried at 95 ℃. The average result of oxytetracycline residues titer after treated is 430.0 U/g and the elimination factor is 96.9%.

A New Species of the Genus Pardosa (Araneae: Lycosidae) from China

XU Chun-hua,ZHU Ming-sheng

2009, 29(6): 627-629,672. DOI: 10.3969/j.issn.1000-1565.2009.06.017

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Pardosa quadridentata sp. nov. is described and illustrated basing on material from Ningxia, China. In addition, the diagnoses of genus Pardosa are also given. All measurements given are in mm. Types are deposited in the Museum of Hebei University.

Determination and Analysis of Adult Nourishment Component of Epicauta chinensis

LI Ya-lin,REN Guo-dong

2009, 29(6): 630-633. DOI: 10.3969/j.issn.1000-1565.2009.06.018

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Adult nourishment component of Epicauta chinensis was determined in this research, in total it contains 7 kinds of trace elements,and Zn and Fe reached 0.038 28% and 0.041 47% respectively in experimentation sample. The proportion of unsaturated fatty acid(P) and saturated fatty acid(S) is 2.78,the content of C_(18:2) and C_(18:3) in fatty acid is the 28.5% and 36.2% respectively, the content of amino acid in experimentation sample is 50.15%,the content of Glu is the highest,reached 7.19%. Analysed result showed that E. chinensis contained high protein,low fat and abundant trace elements.

System Computation of Lactococcus lactis Fermentation

MA Zhai-pu,WU Ling,ZHAO Jian-hua,SHI Chang-can,ZHANG Chun-quan

2009, 29(6): 634-639. DOI: 10.3969/j.issn.1000-1565.2009.06.019

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Based on Lactococcus lactis metabolic pathway, the standardized reaction rate equations of the metabolites could be created automatically, and system model was builded. At the situation of assuming parameters, the varied curves of metabolites concentration was computed, the metabolic process of Lactococcus lactis was quantified. The results showed that 1)when the enzyme concentration was enough, the different initial value of glucose didn't influence the time that reaction reached balance and the occurrence of the extremum; 2)the revised model could apply to mutative strain, then could provide guidance of selecting strain , the complicacy and blindness of experiments can be reduced.

Screeing Experiments on Heavy Salt-tolerance Plants of the Yellow River Delta Tidal Flat

YU De-hua,CHANG Shang-lian,XU Hua-ling,LIU Yu-xin

2009, 29(6): 640-646. DOI: 10.3969/j.issn.1000-1565.2009.06.020

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The salt-tolerance capability of plants were studied by germination under NaCl stress. Brine irrigating in pot and field salt tolerant test in order to screen the salt-tolerance plants in the heavy salt soils of the Yellow river tidal flat. The results showed that high concentration NaCl stress had significant inhibiting effect on seed germination.The seed germination rate was inversely proportional to NaCl concentration.The order of the relative growth yield in seedling is Suaeda salsa L>Tamarix chinensis Lour>Atriplex centralasiatica Iljin>Liminium bicolor>Atriplex triangularis>Oenothera littaralic Jacq>Kosteletzkya vivginica>Sesbania cnnabina(Retz) Pers>Apocynum venetum L.The Tamarix chinensis and the Suaeda salsa (L.)Pall., their salt-tolerance capability were more than 20 g/kg,were selected.It provides the test plants for biology improvement of the heavy salt soil.

Using the Algorithm of Dual Layered PTS to Reduce PAPR in OFDM System

WANG Lan-xun,YANG Kang,XU Ya-tian,LI Ke-yi

2009, 29(6): 647-652. DOI: 10.3969/j.issn.1000-1565.2009.06.021

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For the problem that the peak-to-average-power ratio (PAPR) of the orthogonal freque- ntcy division multiplexing (OFDM) system is high, the dual layered phase sequencing (DLPS) method is made to reduce the PAPR. The method divides the sub-carrier into two layers and each layer uses the suboptimal PTS to reduce the PAPR, so the method reduces the PAPR of the whole OFDM system. The results of the simulation show that the algorithm of dual layered PTS greatly reduced the complexity of the system, while PAPR has been in a situation of better control.

A New Iterative Algorithm Based for Sample Selection

LIU Chun-rong,WU Bo

2009, 29(6): 653-657. DOI: 10.3969/j.issn.1000-1565.2009.06.022

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To overcome the drawbacks that nearest neighbour classification requires huge computation and memory storage, this paper proposes a improved algorithm (different iterative case filtering,DICF). In this algorithm, a set of samples with the poor classification ability is removed from the training set in each iteration until the training set is no longer getting smaller. It can be seen from analysis that time complexity of DICF is O (n~2). The experimental results on some real data sets demonstrate the effectiveness and the feasibility of the proposed algorithm. Compared to traditional methods, such as MCS,ICF and ENN, the condensed sets obtained by DICF is superior in storage and classification accuracy.

Density Based Spatial Clustering on Manifolds

TANG Hao,LIU Xi-yu

2009, 29(6): 658-662. DOI: 10.3969/j.issn.1000-1565.2009.06.023

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Density based clustering are effective and basic clustering techniques for data with spatial attributes. Although there are many proposed algorithms and applications for density a based spatial clustering, one of its widely used assumptions is that the data is distributed in a smooth space. Manifolds are approximately curved spaces which are locally like smooth spaces but not smooth spaces. The purpose of this paper is to propose new density based clustering algorithms on manifolds, that is, on curved spaces. The newly proposed algorithms will apply for nonlinear, non-uniform data distribution. A simple performance analysis is presented. Experimental data are given for testing the performances of the new algorithms.

Test Method of Key Qualifications for SO_2 Automatic Monitor Based on Ultraviolet Fluorescence Method

DONG Fang,LI Xiao-ting,LI Hong-lian

2009, 29(6): 663-666. DOI: 10.3969/j.issn.1000-1565.2009.06.024

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The test method of SO_2 automatic monitor based on ultraviolet fluorescence method is studied, for the first time. And the normalized method of the key qualifications is introduced. The experimental explanation is obtained by testing XHS2000 type SO_2 automatic monitor instrument. The method provides the theory basis for formulating the national metrology verification regulation of the gas online continuous monitoring system in our country, revising and improving the national environmental protection trade standards in the online detection, recheck, and calibration of field use.

Analysis on the Effects of Air-conditioning System on the Early-stage Fire Detection in a Clean Room

CHANG Li,DU Zhen-huang

2009, 29(6): 667-672. DOI: 10.3969/j.issn.1000-1565.2009.06.025

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Smoke movement is numerically simulated using FDS (Fire Dynamic Simulator) developed by NIST in a clean room with an upper-supply and bottom-exhaust air-conditioning system. The velocity field and temperature distribution in the early stage of a fire is analyzed. The effect of the air flow pattern on smoke movement as well as the effect on early stage fire detection are discussed. The temperature and concentrations near the ceiling are affected significantly and the detector activation time will be delayed for dozens of seconds compared with that of the room without air-conditioning systems.

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