Influence of Brownian Motion, Thermophoresis and Magnetic Effects on a Fluid Containing Nanoparticles Flowing over a Stretchable Cylinder

The influence of Brownian motion and thermophoresis on a fluid containing nanoparticles flowing over a stretchable cylinder is examined.The classical Navier-Stokes equations are considered in a porous frame.In addition,the Lorentz force is taken into account.The controlling coupled nonlinear partial differential equations are transformed into a system of first order ordinary differential equations by means of a similarity transformation.The resulting system of equations is solved by employing a shooting approach properly implemented in MATLAB.The evolution of the boundary layer and the growing velocity is shown graphically together with the related profiles of concentration and temperature.The magnetic field has a different influence(in terms of trends)on velocity and concentration.

On the sub-mixed fractional Brownian motion

Let {S t H, t ≥ 0） be a linear combination of a Brownian motion and an independent sub-fractional Brownian motion with Hurst index 0 〈 H 〈 1. Its main properties are studied. They suggest that SH lies between the sub-fractional Brownian motion and the mixed fractional Brownian motion. We also determine the values of H for which SH is not a semi-martingale.

Pricing Perpetual American Put Option in theMixed Fractional Brownian Motion

Under the assumption of the underlying asset is driven by the mixed fractional Brownian motion, we obtain the mixed fractionalBlack-Scholes partial differential equation by fractional Ito formula, and the pricing formula of perpetual American put option bythis partial differential equation theory.

Estimating the shareholder's terminal payoff based on insurer's solvency ratio in mixed fractional Brownian market

This paper studies the insurer’s solvency ratio model in a class of mixed fractional Brownian motion(MFBM) market, where the prices of assets follow a Wick-It? stochastic differential equation driven by the MFBM, by the method of the stochastic calculus of the MFBM and the pricing formula of European call option for the MFBM, the explicit formula for the expected present value of shareholders’ terminal payoff is given. The model extends the existing results.

Critical Exercise Price for American Floating Strike Lookback Option in a Mixed Jump-Diffusion Model

This paper studies the critical exercise price of American floating strike lookback options under the mixed jump-diffusion model. By using It formula and Wick-It-Skorohod integral, a new market pricing model established under the environment of mixed jumpdiffusion fractional Brownian motion. The fundamental solutions of stochastic parabolic partial differential equations are estimated under the condition of Merton assumptions. The explicit integral representation of early exercise premium and the critical exercise price are also given, then the American floating strike lookback options factorization formula is obtained, the results is generalized the classical Black-Scholes market pricing model.

混合分数Brownian运动下美式期权定价

在混合分数Brownian运动驱动的Black-Scholes模型下,研究了美式期权定价问题。利用自融资策略和财富过程的交易费用,给出了一个结构更简单、使用更灵活的美式看跌期权近似定价公式。

混合次分数布朗运动跳扩散环境下可转债定价研究

【目的】为了体现可转债标的资产长记忆性和跳跃性的特点,解决资产收益率增量的不平稳性,提出混合次分数布朗运动跳扩散环境下可转债定价模型。【方法】首先令可转债标的资产的价格变化符合混合次分数布朗运动跳扩散环境;然后利用随机分析理论和随机偏微分方程方法,推导出混合次分数布朗运动跳扩散环境下可转债定价模型,并进一步给出定价模型的参数估计方式;最后运用遗传算法估计参数,选取国内可转债市场的实际数据进行实证分析,结合不同定价模型做对比分析。【结果】本模型对实际价格的拟合效果比传统的布莱克-斯科尔斯模型均方误差平均减少0.34%;通过对遗传算法得到的参数进行定价的拟合效果,比使用历史数据得到的参数进行定价的拟合效果,均方误差平均减少约0.31%。【结论】本模型能在实际市场上为可转债的首日及每日定价决策提供较可靠的理论依据。

基于MFBM模型对亚式期权模拟定价的研究

为了对两资产亚式看涨期权模拟定价问题展开研究,提出基于混合分数布朗运动(mixed fractional Brownian motion,MFBM)模型。首先,基于无套利原理,构造出包含2个自变量的偏微分方程;其次,使用变量变换,对微分方程进行证明并给出其解析解;最后,通过R语言模拟给出数值结果,并分析了Hurst指数、波动率等参数对期权价格的影响。结果表明,在混合分数布朗运动环境下所构造的偏微分方程对亚式期权的定价合理且有效,该模型的建立为多资产期权的定价问题提供了参考。

Effectiveness of heat and mass transfer on mixed convective peristaltic motion of nanofluid with irreversibility rate

Entropy generation is one of the key features in analysis as it exhibits irreversibility of the system. Therefore, the present study investigates the entropy generation rate in a mixed convective peristaltic motion of a reactive nanofluid through an asymmetrical divergent channel with heat and mass transfer characteristics. The endorsed nanofluid model holds thermophoresis and Brownian diffusions. Mathematical modeling is configured under the effects of mixed convection, heat generation/absorption and viscous dissipation. A chemical reaction is also introduced for the description of mass transportation. The resulting system of differential equations is numerically tackled by employing the Shooting method. The findings reveal that entropy generation rises by improving the Brownian motion and thermophoresis parameters. The temperature of the nanofluid decreases due to rising buoyancy forces caused by the concentration gradient. The concentration profile increases by increasing the chemical reaction parameter. The velocity increases by enhancing the Brownian motion parameter.

混合双分数布朗运动驱动的信用风险模型

介绍一种新的随机过程—混合双分数布朗运动,给出一些基本性质,并研究其在信用风险中的应用。在假设公司价值服从几何混合双分数布朗运动的情形下,分别研究违约概率、票息债券与股票的价值以及公司的信用价差,利用Matlable绘出各种情形下的图形,并对其进行了分析。

混合分数布朗运动环境下短期利率服从vasicek模型的欧式期权定价

本文研究了混合分数布朗运动环境下欧式期权定价问题.运用混合分数布朗运动的Ito公式,得到了Black-Scholes偏微分方程.同时,通过求解Black-Scholes方程,得到了欧式看涨、看跌期权的定价公式。推广了Black-Scholes模型有关欧式期权定价的结论.

混合分数布朗运动环境下的欧式期权定价

基于混合分数布朗运动为金融市场驱动模型的情况下,给出了完备的混合型Black-Scholes市场下欧式看涨期权的定价公式。

混合分数布朗运动下亚式期权定价

运用混合分数布朗运动的It^o公式,将几何平均亚式期权定价化成一个偏微分方程求解问题,通过偏微分方程求解获得了几何平均型亚式看涨期权的定价公式.

混合分数布朗运动环境下欧式期权定价

假设股票价格变化过程服从混合分数布朗运动,建立了混合分数布朗环境下支付连续红利的欧式股票期权的定价模型.利用混合分数布朗运动的It-公式,将支付连续红利的欧式股票期权的定价问题转化为一个偏微分方程,通过偏微分方程求解获得了混合分数布朗运动环境下支付连续红利的欧式股票看涨期权的定价公式.

混合分数布朗运动驱动的幂期权定价模型

假设标的资产遵循由混合分数布朗运动驱动的随机微分方程,建立了混合分数布朗运动环境下的金融数学模型.利用拟鞅方法,获得了欧式幂期权定价公式的解析式及其平价公式.最后阐述了分数布朗运动只是混合布朗运动的一种特殊情形.

基于混合分数布朗运动下欧式障碍期权的模糊定价研究

金融市场经常受到一些不确定因素的影响,使得障碍期权的定价具有模糊性,同时资产价格的变化具有长记忆性和“尖峰厚尾”的特征.本文将金融市场的长记忆性特征纳入到模糊环境下的欧式向下敲出看涨障碍期权定价模型中,用混合分数布朗运动刻画资产价格的变化过程.通过引入三角直觉模糊数来刻画期权价格估计的不确定性,构建了在混合分数布朗运动下的Black-Scholes模型下欧式向下敲出看涨障碍期权的定价模型,给出了障碍期权三角直觉模糊价格截集.重点研究了长记忆性指标Hurst指数H对期权价格的影响,通过数值实验对模型的灵敏性和稳健性进行了分析,结果表明:在模糊环境下考虑长记忆性特征所得到的欧式向下敲出看涨障碍期权定价模型更符合金融市场.

不同利率下服从混合分数布朗运动的亚幂期权定价

Black-Scholes期权定价模型的2个重要假设是标的资产服从几何布朗运动和利率为不变的常数,这不符合实际的金融市场环境,针对此问题,将利率分别为常数、非随机函数和服从Hull-White利率模型的随机函数,应用到混合分数布朗运动驱动的Black-Scholes模型中,基于风险中性等价鞅测度得到亚幂期权的定价公式,从而推广了Black-Scholes模型的应用。

混合分数布朗运动下欧式回望期权定价

利用混合分数布朗运动的Itó公式研究了一类奇异欧式回望期权的定价问题.利用该公式获得混合分数布朗运动环境下所满足的抛物型微分方程;深入地研究了浮动执行价情形下的定价问题,证明了欧式浮执行价格的看涨回望期权和看跌回望期权定价公式.

混合跳-扩散分数布朗运动下欧式回望期权定价的数值方法

利用有限差分方法对混合跳-扩散分数布朗运动模型所满足的随机微分方程作了差分近似,得到了欧式回望看跌期权定价模型数值解问题的递推公式,最后给出了数值模拟,验证了解法的有效性.

混合双分数布朗运动下欧式期权的定价

提出一种新的不具有平稳增量的随机过程—混合双分数布朗运动,用来刻画标的资产的价格,进行欧式期权定价的研究.假设标的资产由混合双分数布朗运动驱动,运用对冲原理建立混合双分数布朗运动环境下的欧式期权价值所满足的偏微分方程,并采用边界条件和变量代换的方法得到该偏微分方程的解,即欧式期权的定价公式,其结果可看作是混合分数布朗运动和双分数布朗运动驱动下的一种推广.