期刊文献+
共找到29篇文章
< 1 2 >
每页显示 20 50 100
高面板坝三维真非线性地震反应分析方法及模型试验验证 被引量:34
1
作者 赵剑明 汪闻韶 +1 位作者 常亚屏 陈宁 《水利学报》 EI CSCD 北大核心 2003年第9期12-18,共7页
基于所建立的土石料三维黏弹塑性动力本构模型,并采用新型三维各向异性有厚度薄单元来模拟面板和堆石的接触面特性,结合考虑孔隙水压力的消散和扩散的有效应力分析方法,开发了高面板堆石坝地震反应分析的三维真非线性有效应力分析方法... 基于所建立的土石料三维黏弹塑性动力本构模型,并采用新型三维各向异性有厚度薄单元来模拟面板和堆石的接触面特性,结合考虑孔隙水压力的消散和扩散的有效应力分析方法,开发了高面板堆石坝地震反应分析的三维真非线性有效应力分析方法。通过典型坝例分析,比较了真非线性分析与等效线性分析结果的差异,表明真非线性方法较真实地反应了结构的地震反应,而且能够直接计算出坝体的残余变形,在理论上更为合理。采用模型坝土石料低应力状态下实测的静力和动力特性参数,对三维模型坝进行了地震反应分析,并与相应的大型振动台模型试验结果进行了对比分析,两者结果相当一致,验证了研究所提出的计算方法的可靠性。 展开更多
关键词 高面板堆石坝 动力本构模型 地震反应 真非线性 模型试验
下载PDF
龙首二级面板堆石坝三维真非线性地震反应分析和评价 被引量:5
2
作者 赵剑明 常亚屏 陈宁 《岩土力学》 EI CAS CSCD 北大核心 2004年第z2期388-392,396,共6页
基于土石料三维粘弹塑性动力本构模型,并采用新型三维各向异性有厚度薄单元来模拟面板和堆石的接触面特性,建立了高面板堆石坝地震反应分析的三维真非线性动力分析方法。利用坝料动力特性的大型三轴试验成果,分析计算了龙首二级(西流水... 基于土石料三维粘弹塑性动力本构模型,并采用新型三维各向异性有厚度薄单元来模拟面板和堆石的接触面特性,建立了高面板堆石坝地震反应分析的三维真非线性动力分析方法。利用坝料动力特性的大型三轴试验成果,分析计算了龙首二级(西流水)面板堆石坝的地震反应,主要包括加速度反应、堆石体应力反应及坝体单元抗震安全系数、面板应力反应和变形及接缝位移、高趾墙动力反应等。为大坝的抗震设计提供了有力的技术依据。 展开更多
关键词 面板堆石坝 动力本构模型 三维真非线性 地震反应分析
下载PDF
土工建筑物动力真非线性分析的量化记忆模型 被引量:8
3
作者 迟世春 刘怀林 《水利学报》 EI CSCD 北大核心 2003年第10期51-59,共9页
运用量化记忆模型,将土工建筑物的动力真非线性分析中滞回圈上任意点的塑性模量映射为简单的分段线性关系,通过量化记忆和插值计算无量纲距离δ,进而确定塑性模量,从而使土工建筑物的动力真非线性分析简单易行。量化记忆(以下简称SM)模... 运用量化记忆模型,将土工建筑物的动力真非线性分析中滞回圈上任意点的塑性模量映射为简单的分段线性关系,通过量化记忆和插值计算无量纲距离δ,进而确定塑性模量,从而使土工建筑物的动力真非线性分析简单易行。量化记忆(以下简称SM)模型先以弹塑性理论为基础,将单调加载情况下的应力-应变曲线的非线性剪切模量映射为量化模量在几何空间上的分段线性分布,再以Masing准则为基础,在循环加载情况下,对这种简化的几何分布进行变化调整,使其生成非线性变化的剪切模量。将非线性问题转化为线性问题进行处理,大大简化了非线性计算的复杂性。通过对某筑坝爆破料动力三轴试验曲线的拟合,可以看出量化记忆模型能很好地模拟土的滞回特性。 展开更多
关键词 滞回圈 量化记忆模型 土的动力真非线性分析
下载PDF
非线性元件算法的建模与仿真
4
作者 王葵 商莹 《电网与清洁能源》 2010年第12期34-37,46,共5页
介绍了一种电力系统电磁暂态仿真非线性元件算法。针对在电力系统电磁暂态领域广泛应用的EMTP(电磁暂态程序)和EMTDC(直流电磁暂态程序)技术存在一定的局限性,在此技术基础上提出了一种新的算法,并对非线性元件二极管进行算例证明。新... 介绍了一种电力系统电磁暂态仿真非线性元件算法。针对在电力系统电磁暂态领域广泛应用的EMTP(电磁暂态程序)和EMTDC(直流电磁暂态程序)技术存在一定的局限性,在此技术基础上提出了一种新的算法,并对非线性元件二极管进行算例证明。新算法为所有非线性元件提供了一种真非线性元件算法,解决了补偿法求解过程中遇到的假非线性元件精度低和拓扑约束的问题,即可求解任意拓扑结构的非线性网络。 展开更多
关键词 电磁暂态 EMTP EMTDC 真非线性 非线性 拓扑
下载PDF
非线性元件算法研究
5
作者 王葵 潘贞存 +1 位作者 陈毅苇 商莹 《电子测量技术》 2008年第10期8-11,34,共5页
本文介绍一种电力系统电磁暂态仿真非线性元件算法。目前在电力系统电磁暂态领域应用最广泛的是EMTP(电磁暂态程序)和EMTDC(直流电磁暂态程序)技术,但是此技术还存在一定的局限性。本文在此技术的基础上提出了一种新的算法,并对非线性... 本文介绍一种电力系统电磁暂态仿真非线性元件算法。目前在电力系统电磁暂态领域应用最广泛的是EMTP(电磁暂态程序)和EMTDC(直流电磁暂态程序)技术,但是此技术还存在一定的局限性。本文在此技术的基础上提出了一种新的算法,并对非线性元件二极管进行算例证明。新算法为所有非线性元件提供了一种真非线性元件算法,解决了补偿法求解过程中遇到的假非线性元件精度低和拓扑约束的问题,即可求解任意拓扑结构的非线性网络。 展开更多
关键词 电磁暂态 EMTP EMTDC真非线性 非线性 拓扑
下载PDF
软弱层几何特性与剪切波速对场地反应谱的影响研究 被引量:5
6
作者 刘方成 杨峻 武景芳 《防灾减灾工程学报》 CSCD 北大核心 2016年第5期773-784,共12页
场地土层结构对地震动的影响一直备受关注。针对含有一层软弱土层的匀质场地展开非线性地震反应分析,研究了软弱土层的几何分布特性和剪切波速变化对地表反应谱的影响。结果表明:1软弱层使得场地反应谱特征周期延长,长周期段曲线升高并... 场地土层结构对地震动的影响一直备受关注。针对含有一层软弱土层的匀质场地展开非线性地震反应分析,研究了软弱土层的几何分布特性和剪切波速变化对地表反应谱的影响。结果表明:1软弱层使得场地反应谱特征周期延长,长周期段曲线升高并出现多峰值现象,含软弱层场地的反应谱与无软弱层场地的反应谱差值比远大于工程可接受的误差范围。2软弱层所引起的最大反应谱差值比随软弱层厚度和埋深的增加而近似线性增大,随软弱层剪切波速的减小而非线性增加,在本文算例中,最大反应谱差值比接近12倍。3反应谱最大差值比所对应的敏感周期随着软弱层厚度、埋深和输入加速度幅值的增加而增大,随剪切波速的减小而增大。分析表明,软弱层中的剪应变远大于邻近正常土层中的剪应变,这是引起地表加速度反应谱发生改变的主要原因。 展开更多
关键词 反应谱 软弱土层 场地效应 真非线性地震反应分析 土的滞回模型 非线性动力特性
下载PDF
Modeling and Simulation of the Characteristics of Pneumatic Cushion Cylinders 被引量:6
7
作者 江泽民 张百海 +2 位作者 王涛 彭光正 王海涛 《Journal of Beijing Institute of Technology》 EI CAS 2002年第2期129-132,共4页
The analysis of the characteristics of the cushion process of the pneumatic cushion cylinder is presented, and the nonlinear model of pneumatic cushion cylinders is built in the form of nonlinear differential equation... The analysis of the characteristics of the cushion process of the pneumatic cushion cylinder is presented, and the nonlinear model of pneumatic cushion cylinders is built in the form of nonlinear differential equations. Besides, through the simulation of the pressure in the cushion chamber, the characteristics of the pneumatic cushion cylinder are obtained, which helps to understand the performance of the pneumatic cushion cylinder and improve or design the better cushion structure. 展开更多
关键词 pneumatic cushion cylinder nonlinear model SIMULATION
下载PDF
RESEARCH ON NONLINEAR DISTORTION IN AMPLIFIERS 被引量:2
8
作者 王成华 包骅 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2000年第2期182-187,共6页
Transistors are nonlinear devices, which can produce nonlinear distortion in amplifier while amplifying signals. For weak nonlinear distortion, the expressions of total harmonic distortion (THD), the second order in... Transistors are nonlinear devices, which can produce nonlinear distortion in amplifier while amplifying signals. For weak nonlinear distortion, the expressions of total harmonic distortion (THD), the second order intermodulation distortion(IM2 ), the third order intermodulation distortion(IM 3) and intercept point(IP 3) are deduced. With the aid of software Multisim, we simulate transistor common emitter amplifier, transistor common emitter amplifier with resistor in emitter, differential amplifier and differential amplifier with resistor between emitters. The simulational results and theoretical analyses are almost the same. 展开更多
关键词 nonlinear distortion intermodulation distortion intercept point negative feedback differential amplifier
下载PDF
Multi-domain modeling and simulation of proportional solenoid valve 被引量:3
9
作者 刘艳芳 戴振坤 +1 位作者 徐向阳 田亮 《Journal of Central South University》 SCIE EI CAS 2011年第5期1589-1594,共6页
A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equation... A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equations of the valve were derived in the form of nonlinear state equations.By comparing the simulated and measured data,the simulation model is validated with a deviation less than 15%,which can be used for the structural design and control algorithm optimization of proportional solenoid valves. 展开更多
关键词 fluid mechanics proportional solenoid valve dynamic characteristic multi-domain modeling SIMULATION
下载PDF
Fully Coupled Time-Domain Simulation of Dynamic Positioning Semi-Submersible Platform Using Dynamic Surface Control 被引量:1
10
作者 LIANG Haizhi LI Luyu OU Jinping 《Journal of Ocean University of China》 SCIE CAS 2014年第3期407-414,共8页
A fully coupled 6-degree-of-freedom nonlinear dynamic model is presented to analyze the dynamic response of a semi-submersible platform which is equipped with the dynamic positioning(DP) system. In the control force d... A fully coupled 6-degree-of-freedom nonlinear dynamic model is presented to analyze the dynamic response of a semi-submersible platform which is equipped with the dynamic positioning(DP) system. In the control force design, a dynamic model of reference linear drift frequency in the horizontal plane is introduced. The dynamic surface control(DSC) is used to design a control strategy for the DP. Compared with the traditional back-stepping methods, the dynamic surface control combined with radial basis function(RBF) neural networks(NNs) can avoid differentiating intermediate variables repeatedly in every design step due to the introduction of a first order filter. Low frequency motions obtained from total motions by a low pass filter are chosen to be the inputs for the RBF NNs which are used to approximate the low frequency wave force. Considering the propellers' wear and tear, the effect of filtering frequencies for the control force is discussed. Based on power consumptions and positioning requirements, the NN centers are determined. Moreover, the RBF NNs used to approximate the total wave force are built to monitor the disturbances. With the DP assistance, the results of fully coupled dynamic response simulations are given to illustrate the effectiveness of the proposed control strategy. 展开更多
关键词 dynamic positioning system coupled analysis dynamic surface control RBF NNs adaptive control
下载PDF
Analytical solution of vacuum preloading technology combined with electroosmosis coupling considering impacts of distribution of soil’s electrical potential 被引量:2
11
作者 FENG Jian-ting SHEN Yang +1 位作者 XU Jun-hong SHI Wen 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2544-2555,共12页
Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods.Many studies indicate that the soil electrical potential i... Combining vacuum preloading technology and electroosmosis can improve the treatment effect of soft soil foundation by utilizing the advantages of both methods.Many studies indicate that the soil electrical potential is non-linearly distributed in the treatment process by the combined method.However,in the previous theoretical study,the non-linear-distribution impacts of soil’s electrical potential on soft soil foundation treatment have not been considered.It is always assumed to be linear distribution,which is different from the experimental results.In this paper,the coupling consolidation model of this technology under the two-dimensional plane strain condition is initially established;and the well resistance effect,the vacuum load decreasing along the soil depth and the non-linear variation of electrical potential in the soil are considered.Then,the analytical solutions of the average excess pore water pressure and soil’s consolidation degree in the anode affected area are acquired based on the soil’s electrical potential distribution.Finally,the rationality of the analytical solution is testified by conducting an experimental model test,which proves the scientificity of the analytical solution.The analytical solution is adopted to better predict the dissipation of excess pore water pressure and soil consolidation degree when using the combined technology.This study can provide a reference with more accuracy for the engineering practices of this combined technology in the future. 展开更多
关键词 vacuum preloading-electroosmosis non-linear distribution 2D plane strain coupling consolidation model pore water pressure
下载PDF
A New Chaotic Parameters Disturbance Annealing Neural Network for Solving Global Optimization Problems 被引量:15
12
作者 MAWei WANGZheng-Ou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第4期385-392,共8页
Since there were few chaotic neural networks applicable to the global optimization, in this paper, we propose a new neural network model ? chaotic parameters disturbance annealing (CPDA) network, which is superior to ... Since there were few chaotic neural networks applicable to the global optimization, in this paper, we propose a new neural network model ? chaotic parameters disturbance annealing (CPDA) network, which is superior to other existing neural networks, genetic algorithms, and simulated annealing algorithms in global optimization. In the present CPDA network, we add some chaotic parameters in the energy function, which make the Hopfield neural network escape from the attraction of a local minimal solution and with the parameter annealing, our model will converge to the global optimal solutions quickly and steadily. The converge ability and other characters are also analyzed in this paper. The benchmark examples show the present CPDA neural network's merits in nonlinear global optimization. 展开更多
关键词 Hopfield neural network global optimization chaotic parameters disturbance simulated annealing
下载PDF
Simulation of Vapor Flows Between Two Closed Surfaces of Evaporation and Condensation at High Vacuum
13
作者 张旭斌 许春建 周明 《Transactions of Tianjin University》 EI CAS 2003年第2期101-108,共8页
The steady multi component vapor flows between two closed surfaces of evaporation and condensation are investigated numerically by the nonlinear Bhatnagar Gross Krook equation. The mathematical model will make it poss... The steady multi component vapor flows between two closed surfaces of evaporation and condensation are investigated numerically by the nonlinear Bhatnagar Gross Krook equation. The mathematical model will make it possible to determine the profiles of the process variables between two surfaces of evaporation and condensation if the conditions of evaporation and condensation surfaces are taken into consideration. It is used to simulate the vapor behaviors of the pure dibutylphthalate and the ethylhexyl phthalate ethylhexyl sebacate mixture. The effects of the liquid composition of the evaporation surface, the evaporation temperature, the condensation temperature and the distance between evaporation and condensation surfaces on the evaporation efficiency and separation factor are discussed. 展开更多
关键词 Bhatnagar Gross Krook equation numerical simulation rarefied gas SEPARATION
下载PDF
Design of Dispersion Compensation and Nonlinear Distortion Self-compensationin Co -network Transmission Systems 被引量:1
14
作者 DANG Ming-rui, WANG Xue-qiang (Institute of Optical Fiber Communications, Chongqing University of Posts and Telecommunications, Chongqin g 400065, CHN) 《Semiconductor Photonics and Technology》 CAS 2000年第4期224-230,共7页
Dispersion and nonlinear distortion have an effect on transmission performanc es of optic al fiber transimission systems. The schemes of dispersion compensation and nonli near distortion self-compens ation in telecom-... Dispersion and nonlinear distortion have an effect on transmission performanc es of optic al fiber transimission systems. The schemes of dispersion compensation and nonli near distortion self-compens ation in telecom-CATV co-network transmission systems are reported, followed by investigation on (1) the impact of dispersion compensation fiber (DCF) on fi ber nonlinear effects with a cascade of erbium-doped fiber amplifiers (EDFAs) an d different dispersion compensation schemes, (2) the impact of the complex on th e total nonlinear distortion induced by EDFA gain tilt and the light source. As a result , dispersion compensation optimal scheme and EDFA negative gain tilt are suggest ed as a solution to dispersion compensation and the nonlinear distortion self-c ompensation. 展开更多
关键词 Dispersion compensation Nonlinear distortion Co-network EDFAs Telecom-CATV
下载PDF
Simulation analysis for O-cell test of pile and the interaction of upper pile and lower pile
15
作者 郑英杰 张克绪 张尔其 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第4期541-547,共7页
In this paper,the soil-pile system of O-cell test of pile is simplified as an axi-symmetric problem.By using aggregation of quadrilateral isoparametric elements to simulate pile and soil,setting Goodman's elements... In this paper,the soil-pile system of O-cell test of pile is simplified as an axi-symmetric problem.By using aggregation of quadrilateral isoparametric elements to simulate pile and soil,setting Goodman's elements between pile and soils,a method of numerical simulation analysis on O-cell test of pile is presented with the consideration of nonlinear mechanical behavior of soils and pile-soil interface.The method is applied to the analysis of a case of O-cell test of pile.The load-displacement curves and axial force curves of upper pile and lower pile obtained from the O-cell test of pile are fitted,and parameters of the mechanical model of soils and interface are determined.Analysis results validate that the numerical simulation analysis method put forward in this paper is applicable.Furthermore,the interaction and influence of upper pile and lower pile in the O-cell test are also studied with the method.The result shows that if load box is located in a soil layer with fine mechanical behavior,the interaction of upper pile and lower pile in O-cell test can be ignored generally. 展开更多
关键词 O-cell test of pile simulation analysis nonlinear behavior p-s curve interaction
下载PDF
Multi-motor Drive System Based on Adjacent Coupling Error Strategy
16
作者 李艳 何勇 李慧敏 《Journal of Donghua University(English Edition)》 EI CAS 2009年第4期344-349,共6页
A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the ... A new control strategy named adjacent coupling error strategy is proposed to multi-motor drive system. The adjacent coupling error control scheme is developed considering the tracking speed error in one motor and the synchronous error among adjacent motors simultaneously. In the strategy, due to non-linear effects of the two mentioned errors to the motion control of motor i, an adaptive fuzzy logic controller is designed to decide the control variable of the motor drive system. The multi-motor drive system is modeled and simulated by SIMULINK. The simulated researches show that the proposed strategy improves the synchronization, stabilization, and convergence of the multi-motor system. 展开更多
关键词 multi-motor synchronous control adjacent coupling error strategy adaptive fuzzy contrvller biclosed loop control system
下载PDF
Nonlinear distortion analysis for multisine excitation constrained by power spectral density
17
作者 ZHOU Kun-li QU Ji-feng ZHOU Zhen-yu 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2016年第4期350-357,共8页
Nonlinear distortion introduced by an amplifier when subjected to a multisine excitation decreases the measurement accuracy in many metrological and measurement areas. In this paper, we performed qualitative and quant... Nonlinear distortion introduced by an amplifier when subjected to a multisine excitation decreases the measurement accuracy in many metrological and measurement areas. In this paper, we performed qualitative and quantitative analyses of the nonlinear distortion with the multisine excitations constrained by a constant power spectral density. We present the numerical results with respect to different tone spacings,nonlinear orders, harmonic phases and tone distributions. Moreover, three as-pects of contributions are made to further reveal the distortion mechanism. First, we find that the type Ⅱ components for Schr- oeder-phase multisines distribute uniformly but not all in anti-phase to the type I components for the second order nonlinearity. Second,we simulate the variance of the type I and Ⅱ components and their summation to explain the principle of reducing the type Ⅱ distortion by averaging the results obtained using multiple realizations of random-phase multisines. Third, we observe a special distortion distribution mechanism for the Schroeder-phase multisine excitation The results contribute to a better estima-tion and understanding of the nonlinear distortion. 展开更多
关键词 multisine excitation nonlinear distortion power spectral density type I and contributions
下载PDF
All-Digital Self-Interference Cancellation in Zero-IF Full-Duplex Transceivers 被引量:4
18
作者 Lu Tian Shuai Wang +1 位作者 Zhiheng Cheng Xiangyuan Bu 《China Communications》 SCIE CSCD 2016年第11期27-34,共8页
In this paper,a general scheme in digital self-interference cancellation at baseband for zero-IF full-duplex transceivers is presented. We model the self-interference signals specifically with only the nonlinear disto... In this paper,a general scheme in digital self-interference cancellation at baseband for zero-IF full-duplex transceivers is presented. We model the self-interference signals specifically with only the nonlinear distortion signals falling in receiving band considered. A joint estimation algorithm is proposed for compensating the time delay and frequency offset taking into account the IQ amplitude and phase imbalances from mixers. The memory effect and nonlinear distortion are adaptively estimated by the de-correlated normalized least mean square(DNLMS) algorithm. Numerical simulation results demonstrate that the proposed self-interference cancellation scheme can efficiently compensate the self-interference and outperform the existing traditional solutions. 展开更多
关键词 communication systems full-duplex transceivers self-interference cancellation IQ imbalance de-correlated normalized least mean square algorithm
全文增补中
The mathematical model and simulation of the electrostatic suspension system in the vertical direction
19
作者 Ku Shaoping Zhou Zude Hu Yefa 《Engineering Sciences》 EI 2008年第2期46-49,共4页
In order to research the vibration law of electrostatic suspension systems in the vertical direction, the mathematical model as a nonlinear differential equation is established. A series of simulation is carried out. ... In order to research the vibration law of electrostatic suspension systems in the vertical direction, the mathematical model as a nonlinear differential equation is established. A series of simulation is carried out. The results show that the solution of the differential equation is a periodic function. The amplitude becomes bigger with the original velocity increased. The period becomes smaller with the original velocity increasing. The numerical methods are presented to derive the amplitude and the frequency, and the results coincide with that of the simulation. The condition during which the simple harmonic vibration arises is pointed out. The expressions for the amplitude and the period of simple harmonic vibration are derived respectively, and the results are the same with that of the simulation. This study is helpful for researching the vibration characteristics of the electrostatic suspension system. The external disturb should be controlled to lower the amplitude and the frequency of the vibration. 展开更多
关键词 electrostatic suspension mathematical model SIMULATION
下载PDF
Cardinal temperatures and required biological days from sowing to emergence of three millet species (common, foxtail, pearl millet)
20
作者 Morteza Eshraghi Nejad Behnam Kamkar Atfshin Soltani 《Journal of Agricultural Science and Technology》 2009年第12期36-43,共8页
The modeling of germination and seedling emergence is required for the construction of a simulation model of three species of millet (panicum miliaceum, pennisetum galucum and setaria italica). This study provides t... The modeling of germination and seedling emergence is required for the construction of a simulation model of three species of millet (panicum miliaceum, pennisetum galucum and setaria italica). This study provides the necessary temperature parameters to model these processes. For this purpose, different non-linear regression models including fiat, logistic, quadratic, sigmoidal, dent-like, segmented, beta and curvilinear were used. Root Mean Square of Errors, coefficient of determination and regression coefficients of predicted values versus observed were used to find the appropriate model. Investigating regression coefficients indicated that dent-like model has the least RMSE and a coefficient (RMSE=0.000009, a=0.0006) and the biggest R2 and b coefficient (R2=0.96, b=0.98) in common millet. These coefficients were (RMSE=0.01, a=0.005) and (R2=0.94, b=0.97), and (RMSE=0.004, a=0.05) and (R2=0.99, b=0.99), for beta in foxtail and pearl millet, respectively. According to these coefficients, dent-like, was chosen as the best model to describe the response of common millet germination to temperature (Tb=7~C and Tc=49.50℃). Also beta, was chosen for foxtail millet (Tb=7℃, Tc=49.50℃). Beta, was chosen as the best model for pearl millet (Tb=6.5 ℃ and To=4 ℃ ). These parameters can be used in millet simulation models to predict sowing to emergence duration based on a thermal time concept. Also, required biological days from sowing to emergence using these models varied from 3.57, 4.29 and 5.54, for common millet, foxtail millet and pearl millet, respectively. 展开更多
关键词 cardinal temperature germination rate nonlinearfitting MILLET
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部