一类自由边界问题解的渐近性

讨论一类抛物积微分方程自由边界问题解的渐近性．利用偏微分方程的渐近性理论,证明在无界区域上一类抛物积微分方程自由边界问题的解,以及当时间趋于无穷大时,收敛于稳态的积微分方程自由边界问题的解．这一结论可用于解释期权定价中带跳扩散模型,当执行日期趋于无穷大时,美式期权价格及最佳实施边界收敛于永久美式期权价格及最佳实施边界．     

基于Bates模型的欧式离散障碍期权定价

在标的资产价格满足Bates模型下讨论离散时间情形的欧式障碍期权定价.应用半鞅It?公式、随机过程在不同时间点上的多维联合特征函数、Girsanov测度变换以及Fourier反变换等随机分析方法,给出离散时间情形的欧式障碍期权价格的封闭式解,并利用数值计算实例分析了波动率参数对障碍期权价格的影响.研究结论对连续时间情形的障碍期权定价或其他路径依赖型期权定价十分有借鉴作用.     

倒向随机微分方程在欧式看涨期权中的应用

利用倒向随机微分方程解的有关理论及Ocone鞅的性质,分析欧式看涨期权的完全套期保值性,给出了欧式看涨期权确定价格的概率解。     

期货与期权的组合在套期保值策略中的应用

讨论了同时使用期货与期权的套期保值策略。每个投资者根据不同的需求对未来价格变化有不同的预期和不同的风险承受力，对此可用概率论和金融定价理论，根据目前的期货价格、各种不同敲定价的期权价格，以及投资人的风险承受力和对价格走势的估计，找出最优投资组合。最优的标准是在一定的风险范围内使收益的数学期望达到最大。     

具有随机波动率的美式期权定价

为了更好地解决期权定价中存在的问题,研究了带有Heston随机波动率模型的期权定价问题,对美式期权的最佳实施边界及其提前执行的条件进行了分析和讨论。鉴于美式期权不存在解析定价公式,通过离散化参数空间将带有Heston随机波动率的美式期权价格所满足的随机偏微分方程转化为相应的差分方程,进而采用高阶紧式有限差分方法进行求解,得到了期权价格的数值解。通过数值实验对理论结果进行验证和模拟,对带有常数波动率和随机波动率条件下的两种最佳实施边界进行比较,发现最佳实施边界也具有随机波动性;在设定参数下对波动率的行为和性质进行分析,模拟出波动率曲线,并对高阶紧差分方法的计算结果进行比较,得到了期权的数值解,验证了算法的有效性。此方法对解决随机波动率下的期权定价其他问题,如:随机波动率下的多标的资产期权定价、障碍期权定价的研究具有借鉴价值。     

有限差分方法在期权定价中的应用

偏微分方程的有限差分解法是通过将偏微分方程离散化为差分方程，求得微分方程的近似解。通过研究在期权定价中，价格是随机的期权定价方程的有限差分解法，并与二叉树图法、标准的Black-Scholes定价模型求得的解相比较，得出3种方法的解具有相似性的结论。     

具有不确定执行价格的期权定价模型

利用随机微分方程和鞅方法，讨论了具有不确定执行价格的欧式期权的定价模型，获得具有不确定执行价格的欧式看涨期权及欧式看跌期权定价公式．     

Heston模型的欧式任选期权定价与对冲策略

本文考虑标的股价满足Heston随机波动率模型的任选期权定价.应用Girsanov变换、多维随机变量的特征函数和Fourier反变换等方法,得到欧式任选期权价格的显示解,进一步利用计算实例分析了任选期权价格和△对冲策略受波动率参数的影响.     

Hull-White随机波动率模型的欧式障碍期权

假定标的股票服从Hull-White随机波动率模型,应用鞅方法、条件分布的性质以及Black-Scholes模型的下降敲出欧式看涨障碍期权价格的Taylor展开式获得了期权价格的近似显示解.最后,通过对偶MonteCarlo模拟法比较了近似显示解的准确性,分析了波动率参数对期权价格的影响.     

微分对策在期权定价中的应用:数值分析

研究了期权定价的微分对策方法中得到的偏微分方程的数值解法．通过微分对策的离散化,并运用离散时间动态规划原则得到了原偏微分方程的有限差分逼近．基于粘性解的概念证明了有限差分方程的解一致收敛于原偏微分方程的解．给出了计算机仿真结果,并讨论了期权价格的性质．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.