全文获取类型
收费全文 | 660篇 |
免费 | 62篇 |
国内免费 | 11篇 |
专业分类
化学 | 53篇 |
力学 | 10篇 |
综合类 | 14篇 |
数学 | 624篇 |
物理学 | 32篇 |
出版年
2023年 | 7篇 |
2022年 | 15篇 |
2021年 | 17篇 |
2020年 | 19篇 |
2019年 | 25篇 |
2018年 | 19篇 |
2017年 | 22篇 |
2016年 | 37篇 |
2015年 | 14篇 |
2014年 | 28篇 |
2013年 | 85篇 |
2012年 | 31篇 |
2011年 | 55篇 |
2010年 | 54篇 |
2009年 | 55篇 |
2008年 | 40篇 |
2007年 | 31篇 |
2006年 | 31篇 |
2005年 | 34篇 |
2004年 | 22篇 |
2003年 | 31篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 8篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1958年 | 1篇 |
1952年 | 1篇 |
排序方式: 共有733条查询结果,搜索用时 31 毫秒
41.
42.
本文探讨具有违约风险的人寿保险的最优定价.我们从Black-Scholes的期权定价模型出发,考虑风险管理和准备金的要求,根据一次支付和均衡支付这两种不同的假设分别建立两个优化模型,并且借助于优化技术获得最优解.数量化分析结果表明,两个模型的最优价格对于利息率参数以及非索赔成本的变化都不敏感.这说明这两个模型是稳定的,而且是实用的. 相似文献
43.
Thomas Nagel Margarethe Rammerstorfer 《Central European Journal of Operations Research》2009,17(2):111-129
Motivated by the frequently observed criticism of the regulatory practice arising from companies in the industries concerned,
we investigate the impact of regulation on investment behavior. Therefore, we model the investment timing and volume of a
firm acting in a regulated market. When capping prices, the regulatory authority imposes a price ceiling on market prices.
Accordingly, we use a real option approach where the price cap that limits possible future firm values enters the firm’s portfolio
in form of a short call option position. By comparing this framework to a competitive benchmark model, we derive an optimal
price setting rule for regulators. Moreover, it can be shown how deviations from this optimum affect the investment behavior
of firms.
相似文献
44.
45.
46.
In this paper we are concerned with finite element approximations to the evaluation of American options. First, following
W. Allegretto etc., SIAM J. Numer. Anal. 39 (2001), 834–857, we introduce a novel practical approach to the discussed problem, which involves the exact reformulation
of the original problem and the implementation of the numerical solution over a very small region so that this algorithm is
very rapid and highly accurate. Secondly by means of a superapproximation and interpolation postprocessing analysis technique,
we present sharp L
2-, L
∞-norm error estimates and an H
1-norm superconvergence estimate for this finite element method. As a by-product, the global superconvergence result can be
used to generate an efficient a posteriori error estimator.
This work was supported in part by the National Natural Science Foundation of China (10471103 and 10771158), the National
Basic Research Program (2007CB814906), Social Science Foundation of the Ministry of Education of China (Numerical Methods
for Convertible Bonds, 06JA630047), Tianjin Natural Science Foundation (07JCY-BJC14300), and Tianjin University of Finance
and Economics. 相似文献
47.
Mohamed El Otmani 《Journal of Theoretical Probability》2009,22(3):601-619
In this paper, we study the reflected solution of one-dimensional backward stochastic differential equation driven by Teugels
martingales and an independent Brownian motion. We prove the existence and uniqueness of the solution using a penalization
method combined with Snell envelope theory.
相似文献
48.
We derive in closed form distribution free lower bounds and optimal subreplicating strategies for spread options in a one-period static arbitrage setting. In the case of a continuum of strikes, we complement the optimal lower bound for spread options obtained in [Rapuch, G., Roncalli, T., 2002. Pricing multiasset options and credit derivatives with copula, Credit Lyonnais, Working Papers] by describing its corresponding subreplicating strategy. This result is explored numerically in a Black-Scholes and in a CEV setting. In the case of discrete strikes, we solve in closed form the optimization problem in which, for each asset S1 and S2, forward prices and the price of one option are used as constraints on the marginal distributions of each asset. We provide a partial solution in the case where the marginal distributions are constrained by two strikes per asset. Numerical results on real NYMEX (New York Mercantile Exchange) crack spread option data show that the one discrete lower bound can be far and also very close to the traded price. In addition, the one strike closed form solution is very close to the two strike. 相似文献
49.
We address asymptotic analysis of option pricing in a regime switching market where the risk free interest rate, growth rate and the volatility of the stocks depend on a finite state Markov chain. We study two variations of the chain namely, when the chain is moving very fast compared to the underlying asset price and when it is moving very slow. Using quadratic hedging and asymptotic expansion, we derive corrections on the locally risk minimizing option price. 相似文献
50.
Introducing a surrender option in unit-linked life insurance contracts leads to a dependence between the surrender time and the financial market. [J. Barbarin, Risk minimizing strategies for life insurance contracts with surrender option, Tech. rep., University of Louvain-La-Neuve, 2007] used a lot of concepts from credit risk to describe the surrender time in order to hedge such types of contracts. The basic assumption made by Barbarin is that the surrender time is not a stopping time with respect to the financial market.The goal of this article is to make the hedging strategies more explicit by introducing concrete processes for the risky asset and by restricting the hazard process to an absolutely continuous process.First, we assume that the risky asset follows a geometric Brownian motion. This extends the theory of [T. Møller, Risk-minimizing hedging strategies for insurance payment processes, Finance and Stochastics 5 (2001) 419–446], in that the random times of payment are not independent of the financial market. Second, the risky asset follows a Lévy process.For both cases, we assume the payment process contains a continuous payment stream until surrender or maturity and a payment at surrender or at maturity, whichever comes first. 相似文献