Content of Results of NSFC in our journal

Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Nonlinear Numerical Stability of  θ-One-Leg Methods WANG Wen-Qiang, YU Yue-Xin journal6    2004, 25 (4): 1-3.   Abstract （1831）      PDF（pc） （852KB）（1229）       Knowledge map    Save  According to   algebraic stability and (k,p,q)-algebraic stability of general linear methods, the algebraic conditions of mumerical stability of θ-one-leg methods are obtained,i.e.,θ-one-leg methods is  algebraically  stable and diagonally stable under the constraint  θ≥1/2,and  θ-one-leg methods is  (1,0,2θ -1-ε)-algebraically  stable for any constant ε ≥ 0. Reference | Related Articles | Metrics | Comments（0） Select Model Identification and Fault Diagnosis for Nonlinear Dynamic Networks /Systems (N/S) XIE Hong, PENG Wei-Shao, HE Yi-Gang journal6    2004, 25 (4): 4-9.   Abstract （1903）      PDF（pc） （1474KB）（1040）       Knowledge map    Save By applying block-pulse function transform (BPFT) the hybrid model (H1,B) for a class of nonlinear dynamic N/S was identified in the paper.The relative formulas for calculating the hybrid model   (H1,B) and discrete recursive formulas for computing Volterra series resolution of model of N/S were derived.Based on above a fault diagnosis method of multiple preset models for N/S was also proposed.This method can judge and classify the faults occurring in N/S by checking the matching degree between each preset model and the current working state of N/S.There is no need for computing the current model of N/S and analyzing the features on line.So the method can largely reduce the computational cost and the fault diagnosis can be realized on line.An example of fault diagnosis was given here.The results show that the accuracy of fault diagnosis reaches 80-90 percent by this means. Reference | Related Articles | Metrics | Comments（0） Select Optimization the Inversion Model of Atmospheric Parameter Using Radio Occulation Data SHENG Zheng, HUANG Si-Xun, FANG Han-Xian journal6    2004, 25 (4): 10-13.   Abstract （2104）      PDF（pc） （715KB）（1426）       Knowledge map    Save To sound water vapor precisely in the atmosphere is essential for weather phenomenon research,global climate change research and numerical weather forecast.The main purpose of this paper is to develop an inverse model for atmospheric parameter profiles using radio occulation data.This paper demonstrates the deficiency of the old retrieval model and some atmospheric parameter profiles are obtained.Through the linear retrieval and using the ECMWF’S temperature,the new retrieval model is established,and some atmospheric parameter profiles are given.Then the author analyses the bug in the atmospheric parameter profiles;and finally,brings forward the next way to optimize the retrieval model. Reference | Related Articles | Metrics | Comments（0） Select Extracting Indium From Reduced Solution With Adding Manganese in the Hydrometallurgy of Zinc Without Producing Iron Residue LI Shi-Qing, LIU Wei-Feng, TANG Mo-Tang, HE Jing, LU Jun-Le- Journal of Jishou University(Natural Sciences Edition)    2004, 25 (4): 14-18.   Abstract （2461）      PDF（pc） （650KB）（1613）       Knowledge map    Save The extraction of the cations such as Fe2+,Mn2+,Zn2+ and In3+ in the simulated sulfate solution by P204 has been examined from a technology solution-reduction solution with adding manganese,that was obtained by reduction of the high leached solution in the hydrometallurgy of zinc without iron residue.The optimum separation conditions have been determined as:(1) component of the organic phase being 30% kerosene+ 70% sulfidized kerosene,(2) extraction temperature being 20 ℃,（3）progressions being 3,(4) ratio of O/A being 3∶1,and (5) extration time being 5 min.Under the optimum extraction conditions,the extration rate of indium is not less than 99.4%.the saturated capacities of P204 on In3+,Zn2+ and Mn2+ were measured for 54.0 mg·mL-1，22.0　mg·mL-1　and 2.0　mg·mL-1respectively.The direct recovery rate of indium for the whole flow sheet arrived at 77.58% and the total recovery rate reached 95.0%,In comparision with the traditional flow sheet the total recovery rate of indium was higher than 20%. Reference | Related Articles | Metrics | Comments（0） Select A Review of Heavy Metal Accumulation and Tolerance by Plants of Different Ecotype PENG Shao-Lin, DU Wei-Bing, LI Zhi-An journal6    2004, 25 (4): 19-26.   Abstract （2998）      PDF（pc） （828KB）（1874）       Knowledge map    Save Phytoremediation is now regarded as one of the most important techniques to clean soil of heavy metal contamination.It is a key for phytoremediation to select proper plants.Concept of species in taxonomy is not enough in identifying plants for ecological restoration.Rather,consideration must be taken at the level of ecotype.Plants of different ecotype often have large difference in accumulating and tolerating heavy metal,although they are classified as the same species in taxonomy.They could respond differently to variation of concentration,ion form,and interaction of heavy metals.Difference in accumulating heavy metals is mainly attributed to the difference of heavy metal transporter,detoxication and genetics.Difference in enduring heavy metals is due to the difference in genetics,enzyme system and sequestration in cell of different ecotypic plants,while phytochelatins (PC) is not a key factor.Plants of different ecotype are ideal materials in study of hyperaccumulation,toleration and detoxication of heavy metals.This paper introduces the concept,origination and classification of ecotype.It also reviews research progress in heavy metal accumulation and toleration of different ecotypic plants. Reference | Related Articles | Metrics | Comments（0） Select Ultrastructural Observations on Programmed Cell Death of the Nucellar Cells in Doritis pulcherrima WU Cheng-Hou, XIA Kuai-Fei, LIANG Cheng-Ye, YE Xiu journal6    2004, 25 (4): 27-29.   Abstract （2046）      PDF（pc） （409KB）（1431）       Knowledge map    Save Ultrastructral observations on programmed cell death of the nucellar cells in Doritis pulcherrima showed some distinct characteristics,that is,demonstrated condensation of the chromatin;decreased quantity of mitochondria or the loss of their cristae;increased amount of vacuoles,and some of which contained residum of organelles or membrane structures. Reference | Related Articles | Metrics | Comments（0） Select Necessary and Sufficient Conditions for Strongly　Convergence of  Iterative Sequence of Asymptotically Pseudo-Contraction Mapping NI Ren-Xing journal6    2004, 25 (3): 1-5.   Abstract （2189）      PDF（pc） （2173KB）（1201）       Knowledge map    Save Some necessary and sufficient conditions for strongly convergence of Ishikawa iterative sequence with random errors of fixed points for asymptotically pseudo-contraction mappings and asymptotically non-expansive mapping in real Banach spaces were given .The results include,extend,and improve some recent results given by Zhang Shi-sen,Liu Q H，etc. Reference | Related Articles | Metrics | Comments（0） Select On the Second Power Mean of Dirichlet L-function GAO Li, Zhao-Zhen journal6    2004, 25 (3): 6-9.   Abstract （2127）      PDF（pc） （1671KB）（1133）       Knowledge map    Save The main purpose of this paper is using the classical estimation of Kloostermann sum and the analytic method to study the second power mean of Dirichlet L-functions with the weight of general Kloostermann sums,and give an interesting second mean value theorem. Reference | Related Articles | Metrics | Comments（0） Select A Universal Method of Analysis And Research on Fault Diagnosis for Nonlinear Dynamic Networks XIE Hong, HE Yi-Gang, LI Yi-Fu, WEN Zheng-Quan journal6    2004, 25 (3): 10-14.   Abstract （2038）      PDF（pc） （667KB）（1261）       Knowledge map    Save By using method of canonical piece-wise linearization and fundamental knowledge of circuit theory,a set of canonical piece-wise-linear equations for nonlinear dynamic networks is presented.This analysis method neednt calculate the time when the response crosses a boundary.The another advantage of this method is that the calculation of dynamic response is converted to algebraic recursive computation.Because the dynamic response can easily be resolved by computer simulation,a basic idea of fault diagnosis method of nonlinear dynamic networks based on wavelet-neural network is also briefly decribed. Reference | Related Articles | Metrics | Comments（0） Select One Dimensional Simulation of Mold Filling in PowderInjection Molding LI Mao, XIE Gui-Liang, CAI Hai-Tao journal6    2004, 25 (3): 15-17.   Abstract （2060）      PDF（pc） （1011KB）（1449）       Knowledge map    Save The filling of strip mold with thin wall cavity is simplified as one dimensional problem,a routine is worked out for the numerical simulation of the field variables such as temperature and velocity,and valuable results are generated for the mold filling process including the moving front and the datas of coupling fields. Reference | Related Articles | Metrics | Comments（0） Select Security Control System of Distributed Application Software Based on Extended Client/Server Model NING Wei, ZHANG Bo, XU Shi-He, YU Yong-Chun journal6    2004, 25 (3): 18-22.   Abstract （1945）      PDF（pc） （573KB）（1571）       Knowledge map    Save By combining three-tier Client/Server application software security control system model, this paper puts forward a kind of security control system model of distributed application software based on extended Client/Server, adds application interface tier and data interface tier to original model, and screens fuzzy boundary between the tiers in the original model. This design makes every logical tier change alone, and helps to build model of architecture and to implement consistency of the system, further strengthens the retractility and flexibility of distributed application, then designs the frame of the security control system by using the model based on four-tier Client/Server. Finally, the security verification is implemented on Web by using extended Web server of the system. Reference | Related Articles | Metrics | Comments（0） Select The Ferns in Arsenic-Rich Areas in Shimen County of Hunan Province——Vegetation Restoration in Polluted Environment in Arsenic-Rich Areas YAN Yue-Hong, CHEN Hong-Feng, LI Chang-Han, HUANG Zhong-Liang, XING Fu-Wu journal6    2004, 25 (3): 23-28.   Abstract （2420）      PDF（pc） （435KB）（1369）       Knowledge map    Save Base on our recent study,22 species of ferns and their companion plants in an arsenic-rich area in Hunan are reported in this paper.And the analyses on the systematic relationship,frequence and abundance,and the adaptability of these ferns are given in order to find more arsenic-accumulating ferns.The result shows that there is a little more species in Pteridoid series,Thelypteridoid-Asplenioid series and Dryopterioid series than that in the other groups.The species with higher abundance and higher frequence in the arsenic-rich area are Pteris vittata,P.multifida,Cyclosorus acuminatus and Cyrtomium fortunei.The growth relationship and the biohabits of the ferns in the arsenic-rich areas of in Shimen and other reported arsenic-accumulating ferns show that there are new arsenic accumulation in Pteridoid series. Reference | Related Articles | Metrics | Comments（0） Select On Divisibility of Euler Numbers LE Mao-Hua journal6    2004, 25 (2): 1-2.   Abstract （1744）      PDF（pc） （133KB）（1319）       Knowledge map    Save Let pbe an odd prime,we give a necessary and sufficient condition for Ｅｔ≡０（ｍｏｄ　ｐ）,where ｔ＝２[ｐ／４]，Ｅｔis the  ｔ－ｔｈ　Euler number.In particular,if ｐ≡５（ｍｏｄ　８）,then Ｅｔ０（ｍｏｄ　ｐ）. Reference | Related Articles | Metrics | Comments（0） Select A Schrodinger Formulation for Paraxial Light Beam Propagation LIU Cheng-Yi, YIN Jian-Ling, HU Wei journal6    2004, 25 (2): 3-9.   Abstract （2539）      PDF（pc） （1787KB）（1457）       Knowledge map    Save This paper is a summary of the theory of the Schr??dinger formulation, together with the interrelated works.With the in- depth study of this theory, it has extended from the propagat ion in the real refractive index to the propagation in the complex refractive index, from the ABCD system to the effective ABCD system, and from the spatial coordinatesystem to the time coordinate system, etc. Reference | Related Articles | Metrics | Comments（0） Select Numerical Procedures of Numerical Global Weather Forecast on Spectral Method GONG Xi-Ping, LI Jin-Cai, ZHAO Wen-Tao, SUN An-Xiang journal6    2004, 25 (2): 10-14.   Abstract （2077）            Knowledge map    Save This paper studies the numerical caculat ion process of global weather forecast model which is based on spectral method.The model use the Eulerian U- V model. The atmosphere is divided into NLEN layers and these layers are defined by the pressures at the interfaces between the / half- levels0. The prognostic variables are presented by their values at / full- level0 pressures. Spectral method to discretize is used in horizontal direction and a semi- implicit correction is used to dicretize in time. Reference | Related Articles | Metrics | Comments（0） Select Damage Identification of Actual Bridge Based on Subspace Rotation Algorithm ZHONG Wei-Qiu, GONG Jin-Xin, LIU Yi journal6    2004, 25 (2): 15-20.   Abstract （1820）      PDF（pc） （705KB）（1214）       Knowledge map    Save Structural damage identification is critical to the reliability evaluation of structures. Now damage identification method based on parameters of structural model is one of the research hotspots. Subspace Rotation Algorithm introduced in this paper belongs to the damage identification method based on parameters of structural model. Subspace Rotation Algorithm is based on finite element method of structures,use the matrix transform method and separates the damage location and damage extent problems and is computationally inexpensive. Subspace Rotation Algorithm is used to detect damage of an actual bridge in this paper and practice testifies that Subspace Rotation Algorithm only needs the first order frequency and shape mode to identify the main damage location and damage extent of the actual bridge so that it is simple in calculation and feasible. Reference | Related Articles | Metrics | Comments（0） Select Preparation of Superfine Powder by Hydrothermal Method and Its Applying Prospect on Polishing Powder XU Zhao-Di, ZHOU Xin-Mu, LI Yong-Xiu, TAN Hong-Yu journal6    2004, 25 (2): 21-24.   Abstract （2228）      PDF（pc） （395KB）（1285）       Knowledge map    Save The characterist ics and react ion dynamics of hydrothermal condition are shown, and various hydrothermal methods processing superfine powder are all summarized. It is illustrated that most chararteristics are excellent ,whether physical property or chemical property,materials and crystals on technologic field can be prepared. Its application will be more extensive. Excellent polishing powder too are prepared by hydrothermal method.Therefore, hydrothermal method has applicat ion foreground for preparation of polishing powder. Reference | Related Articles | Metrics | Comments（0） Select On Dynamic Change and Driving Forces for Eco- Environmental Quality of Jiangsu Province YANG Xiu-Chun, ZHU Xiao-Hua journal6    2004, 25 (2): 25-29.   Abstract （2088）            Knowledge map    Save Based on the AHP method and the Gray theory, the change and driving forces for eco- environmental quality of Jiangsu Province, China are studied. Some conclusions are drawn as the followings. ( 1)The maximum and minimum indexes of eco- environmental quality of 11 cities of Jiangsu Province appear in different time, which shows the regional character. ( 2)The eco- environmental quality of Jiangsu Province is meliorated as a whole in 1990s??. ( 3)The mechanism of eco- environmental quality change of 11 cities of Jiangsu Province is different. ( 4)The main factors driving the eco- environmental quality of Jiangsu Province come from nature, populat ion growth and its pressure on the land.In a word, this research is useful to improve and manage the eco- environment of Jiangsu Province. Reference | Related Articles | Metrics | Comments（0） Select Reliability Method on How to Handle the Expert Advices Comprehensively YANG Xiao, YANG Zhi-Min journal6    2004, 25 (2): 30-34.   Abstract （2009）      PDF（pc） （1372KB）（1312）       Knowledge map    Save This paper researches the reliability method on how to handle the expert advices comprehensively. It introduces definitions of reliability and comprehensive reliability of the expert. Based on them, the reliability method of comprehensively handling expert advices is studied. It also explains the application of this method by using some real examples. Reference | Related Articles | Metrics | Comments（0） Select A Jacobi Symbol Concerning the Exponential Diophantine Equation ax+by=cz LE Mao-Hua journal6    2004, 25 (1): 1-2.   Abstract （2116）      PDF（pc） （648KB）（1683）       Knowledge map    Save   Let r be an odd integer with r > 1 , and let u, v be positive integers such that 2 | u gcd ( u, v ) and u > 2r v????, Further let a, b, c be positive integers satisfying a + b - 1 = ( u + v - 1) r and c = u2 + v2 . The value of Jacobi symbol ( b/ v ) / ( a/ u) is determined. This result can be used for solving the exponential diophantine equation ax+by=cz Reference | Related Articles | Metrics | Comments（0） Select Asymptotic Stability of Runge- Kutta Methods for Delay Differential Equations With a Bounded Delay WANG Wen-Qiang, XIAO Fei-Yan journal6    2004, 25 (1): 3-6.   Abstract （2045）      PDF（pc） （1670KB）（1332）       Knowledge map    Save This paper discusses the nonlinear stability of Runge- Kutta methods for delay different ial dquations with a bounded delay. It is proved that a ( k , l ) - algebraically stable Runge- Kutta methods with linear interpolation procedure is asymptotically stable. Reference | Related Articles | Metrics | Comments（0） Select The Almost Periodic Solution of Two Order Neutral Differential Equation With Piecewise Constant Argument WANG Xin, HE Ming-Ke journal6    2004, 25 (1): 7-12.   Abstract （2175）      PDF（pc） （2183KB）（1067）       Knowledge map    Save In this paper the authors investigate the almost periodic solution of two order neutral functional differential equation with piecewise constant argument . By using fixed point theorem and constructing almost periodic sequence solution for difference equation, the authors get the sufficient condit ions for the existence of the almost periodic solution. Reference | Related Articles | Metrics | Comments（0） Select Asymptotic Stability of Linear - Methods for Volterra Integral- Delay Equations YU Yue-Xin, WANG Wen-Qiang journal6    2004, 25 (1): 13-15.   Abstract （2183）      PDF（pc） （1404KB）（1304）       Knowledge map    Save This paper is concerned with the asymptotic stability of linear-methods for Volterra integral- delay equations. It is shown that linear-methods are asymptotically stable if 1/ 21. Reference | Related Articles | Metrics | Comments（0） Select Some Results on Parameter Estimation In a Linear Model With Mixed Coefficents LI Hui, LIU Jian-Zhou journal6    2004, 25 (1): 16-21.   Abstract （1966）      PDF（pc） （2160KB）（1265）       Knowledge map    Save For the problem of est imating parameters, under quadratic loss and matrix loss, in a linear model with mixed coefficients, it has been given that there exist the necessary and sufficient condit ions of the uniformly minimum risk unbias (UMRU) estimators and the uniformly minimum risk equivariant( UMRE) estimators of regression coeff icients under an affine group of transformations, and the necessary and sufficient condit ions of the UMRE estimators under a transitive group of transformations respect ively.Admissibility is derived for the general least square ( GLS) estimators of regression coefficients. Reference | Related Articles | Metrics | Comments（0） Select A Method for Generating Straight Beam Element Shape Functions by Means of Its Properties LOU Ping, ZHENG Zu-Yong, ZENG Qing-Yuan journal6    2004, 25 (1): 22-25.   Abstract （2569）      PDF（pc） （657KB）（2009）       Knowledge map    Save A method for generating straight beam element shape functions by means of its propert ies is presented. The procedures for generating straight beam element shape function are following. Firstly, the shape functions with unknown constants at j th node in beam element are constructed by means of the properties of the shape function in remaining nodes in the same element; Secondly, the shape functions at the j th node are obtained by using the properties of this shape function at j th node; Lastly, the above steps are repeated, and then the functions at other node are found. The approach is illustrated by generating shape functions of three- node straight beam element with six degrees of freedom.The shape funct ions of two- node straight beam element with six degrees of freedom and two- node straight beam element with eight degrees of freedom are given. Compared with the classical method, the proposed method decreases the amount of work for solving shape functions obviously. Reference | Related Articles | Metrics | Comments（0） Select Study on Fast Propagation of Juj ube C. V. Jidanzao by Tissue Culture WU Cheng-Hou, HE Ye-Hua, XIE Bi-Xia, HU Fang-Ming journal6    2004, 25 (1): 26-28.   Abstract （2091）      PDF（pc） （517KB）（1518）       Knowledge map    Save The induct ion of adventit ious buds from stem segments and the forming of plantlets in vitro were studied in Jidanzao jujube .The results showed that adventitious buds could be induced from stem segments on the culture medium of MS+ ZT 1. 75 mg?L-1+ KT 2. 0 mg?L-1. The addition of low concentrations of NAA to the medium made higher induction rates of advent itious buds and 4. 2 times, the optimal proliferation number,was gotten on the medium of MS+ ZT 1. 75 mg?L-1+ KT 2. 0 mg?L-1+ NAA 0. 05 mg?L-1. When the shoots formed in vitro got length of 3~ 4 cm, they were used for the induction of adventitious roots.The optimal medium for this purpose was 1??2MS+ IBA 0. 8 mg?L-1 and the forming rate of plantlets was over 95. 0%. In addition, the sterilization of explants and the transplant of plantlets were also studied. Reference | Related Articles | Metrics | Comments（0）