共查询到20条相似文献,搜索用时 265 毫秒
1.
2.
以轻重离子4He散射作为手段,对16O原子核的集团结构进行了检验.并与传统的核子结构模型做了对比.本文结果对16O集团结构提供一个支持. 相似文献
3.
4.
5.
在三体模型的基础上,采用汤川作用势,进行变分计算,进一步研究了晕核11Li,14Be和17B的基态性质,给出了晕中子密度分布的一个解析表达式.理论计算结果与最新的实验数据一致. 相似文献
6.
利用整个中能区的质子总截面和朝前散射振幅作为手段,对原子核12C和16O的α粒子结构模型进行了检验.讨论了4He的总截面.结果是对12C和16O的α粒子结构观点提供了一个有力的支持. 相似文献
7.
对基于12C的两种不同的结构模型建立起的描述12C+12C的散射模型进行了对比.比较表明,12C的α粒子结构模型能给出更好的结果. 相似文献
8.
本文研究了一个mπ≠0时改进的Skyrme模型,计算了核子的静态性质,结果表明,和原先Skyrme模型的预言[3]醋酸纤维,绝大部分数据有了改进,特别是2>1/2的值增大了一倍,为0.56fm,已接近实验值. 相似文献
9.
利用148Nd(9Be, 5n)152Gd重离子熔合蒸发反应, 对152Gd(Z=64, N=88)核的高自旋态进行了研究. 在152Gd核中发现了10多个新的高自旋能级和一个新的S带结构. 实验中首次观察到152Gd核完整的第一个带交叉, 与推转壳模型计算结果和邻近核实验结果的比较显示带交叉是由一对i13/2中子的顺排造成的. 通过对152Gd核运动学转动惯量的分析, 得到152Gd核的形状随着自旋变化的实验证据. 相似文献
10.
11.
In this study, we investigate three kinds of fractional differential models (distributed-order model, variable-order model and random-order model) for characterization of anomalous diffusion. The characteristics, physical advantages and potential applications of each model are highlighted. The numerical simulations also validate our analytical and comparison results. Furthermore, a generalized distributed-variable-order model and a more generalized distributed-variable-random-order model are proposed to combine the advantages of distributed-order model, variable-order model and random-order model. 相似文献
12.
A Simplified Neuronal Model for the Instigation and Propagation of Cortical Spreading Depression 下载免费PDF全文
Huaxiong Huang Robert M. Miura & Wei Yao 《advances in applied mathematics and mechanics.》2011,3(6):759-773
In this paper, we construct a simplified neuronal model that is capable
of simulating the instigation of cortical spreading depression (CSD) and
propagation of a CSD wave. Our model is a simplification and extension of
a single neuron model proposed in the literature for studying the instigation
of CSD. Using the simplified neuronal model, we construct a network of these
simplified neurons. This network model shows that the propagation of a CSD
wave occurs naturally after it is instigated electrically or chemically.
Although the model is simple, the speed of the CSD wave predicted by our
model is consistent with experimentally observed values. Finally, our model
allows us to investigate the effects of specific ion channels on the spread
of a CSD wave. 相似文献
13.
A dual-model method is proposed for correcting the calibration model. In the method, a primary calibration model is built using the spectra of a primary instrument and a correction model is established to describe the ratios between the predicted results from the spectra of different instruments. The prediction for the spectra of secondary instrument can be achieved by correcting the prediction of the primary model. A mathematical proof is described for the existence of the correction model, and the model is investigated using a near-infrared spectroscopic dataset of plant leaf samples measured on two instruments. The results show that a precise correction model is obtained and the model can be used to correct the predictions of the primary model. The correlation coefficients between the predicted and the reference ratios are above 0.9, and the prediction error after the correction is at the same level of the primary model. 相似文献
14.
Conditional Source-term Estimation (CSE) is a closure model for turbulence–chemistry interactions. This model uses the first-order CMC hypothesis to close the chemical reaction source terms. The conditional scalar field is estimated by solving an integral equation using inverse methods. It was originally developed and has been used extensively in non-premixed combustion. This work is the first application of this combustion model for a premixed flame. CSE is coupled with a Trajectory Generated Low-Dimensional Manifold (TGLDM) model for chemistry. The CSE-TGLDM combustion model is used in a RANS code to simulate a turbulent premixed Bunsen burner. Along with this combustion model, a similar model which relies on the flamelet assumption is also used for comparison. The results of these two approaches in the prediction of the velocity field, temperature and species mass fractions are compared together. Although the flamelet model is less computationally expensive, the CSE combustion model is more general and does not have the limiting assumption underlying the flamelet model. 相似文献
15.
Ya Bo Wu Ming Hui Fu Fang Yuan Cheng Huan Huan Fu 《General Relativity and Gravitation》2009,41(8):1677-1693
In this paper a more general phenomenological model is proposed on the basis of the Hobbit model in Cardone et al. (Phys Rev
D 69:083517, 2004). The main purpose of constructing our model is to make this model can not only mimic the ΛCDM model, but
also describe a four-phase smooth transition of the universe, namely the inflationary phase, a radiation-dominated phase,
a matter-dominated phase and a de Sitter-like phase. In order to check whether this model is a viable one, the evolutions
of the universe are respectively discussed in the two cases, and the possible physical interpretations for this model are
also respectively shown by using the scalar fields. Finally, the structure formations in our model are simply discussed for
the both cases, and the results given by us reconfirm that our model can be regarded as a fit to the ΛCDM model, if we choose
the proper conditions. 相似文献
16.
17.
锂离子电池的电化学模型对于电池特性分析和电池管理具有重要意义,但是准二维(P2D)模型复杂度太高,为了在保证模型精度的基础上尽量降低复杂度,本文提出了一种包含液相简化的P2D (LSP2D)模型,该模型首先基于电化学平均动力学将电池端电压化简成为仅耦合固相Li+浓度c_s和液相Li+浓度c_e的方程,然后进一步对表达c_s和c_e演化规律的偏微分方程进行抛物线近似化简,使得最终的模型由多项式组成.COMSOL仿真表明在放电倍率为1C时该模型与单粒子(SP)模型的估算精度和速度相当,但在放电倍率为3C时,该模型的估算时间比P2D模型减少了99.73%,与SP模型相当,估算精度相比SP模型有大幅度提升. 相似文献
18.
In the present paper, the two-dimensional Ising model with anisotropic nearest-neighbor, next-nearest-neighbor and four-spin interactions has been studied. The ground states and energy of the model have been obtained. The model is equivalent to an eight-vertex model on its dual lattice. In some special cases, the model can be solved exactly as a zero-field eight-vertex model or a free-fermion model. Explicit phase diagrams are obtained exactly. 相似文献
19.
In the last few decades, nanoindentation has gained widespread acceptance as a technique for materials properties characterization at micron and submicron length scales. Accurate and precise characterization of material properties with a nanoindenter is critically dependent on the ability to correctly model the response of the test equipment in contact with the material. In dynamic nanoindention analysis, a simple Kelvin–Voigt model is commonly used to capture the viscoelastic response. However, this model oversimplifies the response of real viscoelastic materials such as polymers. A model is developed that captures the dynamic nanoindentation response of a viscoelastic material. Indenter tip-sample contact forces are modelled using a generalized Maxwell model. The results on a silicon elastomer were analysed using conventional two element Kelvin–Voigt model and contrasted to analysis done using the Maxwell model. The results show that conventional Kelvin–Voigt model overestimates the storage modulus of the silicone elastomer by ~30%. Maxwell model represents a significant improvement in capturing the viscoelastic material behaviour over the Voigt model. 相似文献
20.
This paper presents a car-following model that considers the asymmetric characteristic of the velocity differences of the vehicles in a traffic stream. The problems of the prevalent general force (GF) model and the full velocity difference (FVD) model were solved. Furthermore, the optimal velocity (OV) model, the GF model, and the FVD model are proved to be the special cases of the proposed asymmetric full velocity difference (AFVD) model. The mathematical model is presented, followed by simulation analysis which demonstrates the properties of the AFVD model. 相似文献