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31.
分析了当前国内外典型中小型特种飞机的特点和应用方向,阐述了中小型特种飞机系统的技术发展趋势。通过分析典型的特种通用飞机的性能和平台构型特点,详细描述了基于典型中小型特种飞机平台的机载侦察监视应用系统的组成、原理、主要性能及技术难点,并结合实际工程应用,介绍了系统的应用成果。应用分析表明,基于中小型特种飞机平台的机载平台的应用系统有较大的应用范围和市场前景。 相似文献
32.
High‐performance work systems and workplace performance in small,medium‐sized and large firms 下载免费PDF全文
Ning Wu Kim Hoque Nicolas Bacon Juan Carlos Bou Llusar 《Human Resource Management Journal》2015,25(4):408-423
This article draws on the Organisational Growth and Development (OGD) life cycle model to explore the relationship between high‐performance work systems (HPWS) and performance in firms of different size, thereby extending understanding of congruence or ‘best fit’ theory within strategic HRM debates. With reference to management control theory, economies of scale and the availability of specialist managerial skills, the article hypothesises that while an HPWS–performance relationship might exist in small, medium‐sized and large firms, the relationship will be stronger in large firms than in both small and medium‐sized firms, and stronger in medium‐sized firms than in small firms. Analysis of data from the British Workplace Employment Relations Survey demonstrates, however, that there is no association between HPWS and workplace performance in medium‐sized firms, in contrast to the positive relationship between HPWS and performance found in large firms and between HPWS and labour productivity in small firms. 相似文献
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以小叶章的茎段作外植体,采用正交设计法,考察6-BA、TDZ、NAA三种激素对小叶章初代培养产生的影响,确定适宜的激素种类及水平,优化筛选出适宜小叶章的诱导培养基.研究表明,激素6-BA是茎段诱导的关键因素;适宜小叶章初代培养的培养基配方为:1/2MS+6-BA0.5 mg·L~(-1)+TDZ0.1mg·L~(-1)+NAA0.1 mg·L~(-1)。 相似文献
34.
The financial disintermediation mechanism known as “loan-based-crowdfunding” has recently come under regulation in several countries. This competitive investment and finance vehicle is already well established in the US and British markets.By compiling empirical data from a reference crowdfunding platform, this article compares loan-based crowdfunding with traditional investment vehicles such as investment funds, equities or pension funds.The conclusion of the study is that saving through crowdfunding allows the optimization of a portfolio comprising both institutional and retail investors. 相似文献
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系统建立了三维仿真框架,建立了三维空间属性模型和非空间属性模型,分别对空间数据和非空间数据进行储存和管理。并建立了Hardy-Cross迭代模型和离散反馈型神经网络模型优化通风网络模型。并以C#语言来实现系统的功能。 相似文献
36.
We study parametric and non‐parametric approaches for assessing the accuracy and coverage of a population census based on dual system surveys. The two parametric approaches being considered are post‐stratification and logistic regression, which have been or will be implemented for the US Census dual system surveys. We show that the parametric model‐based approaches are generally biased unless the model is correctly specified. We then study a local post‐stratification approach based on a non‐parametric kernel estimate of the Census enumeration functions. We illustrate that the non‐parametric approach avoids the risk of model mis‐specification and is consistent under relatively weak conditions. The performances of these estimators are evaluated numerically via simulation studies and an empirical analysis based on the 2000 US Census post‐enumeration survey data. 相似文献
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Most of the existing pricing models of variance derivative products assume continuous sampling of the realized variance processes, though actual contractual specifications compute the realized variance based on sampling at discrete times. We present a general analytic approach for pricing discretely sampled generalized variance swaps under the stochastic volatility models with simultaneous jumps in the asset price and variance processes. The resulting pricing formula of the gamma swap is in closed form while those of the corridor variance swaps and conditional variance swaps take the form of one‐dimensional Fourier integrals. We also verify through analytic calculations the convergence of the asymptotic limit of the pricing formulas of the discretely sampled generalized variance swaps under vanishing sampling interval to the analytic pricing formulas of the continuously sampled counterparts. The proposed methodology can be applied to any affine model and other higher moments swaps as well. We examine the exposure to convexity (volatility of variance) and skew (correlation between the equity returns and variance process) of these discretely sampled generalized variance swaps. We explore the impact on the fair strike prices of these exotic variance swaps with respect to different sets of parameter values, like varying sampling frequencies, jump intensity, and width of the monitoring corridor. 相似文献
40.
中小企业融资难问题已成为制约我国市场经济体制改革的重要因素。对主要发达国家经验的梳理,可以得到解决该问题的一般规律。基于我国中小企业发展的特点、金融系统结构失衡、政府职能错位三个方面的解读,可以发现我国中小企业融资难问题具有特殊性。本文提出的建议,包括构建"银政合作"模式,推进金融体制改革,创建中小型金融机构。 相似文献