基于KL25的UART通信UHM构件研究与实现

基于KL25 MCU,研究并探讨海明码校验技术在该类芯片中UART通信的应用实现方式,将海明码校验技术与UART通信一起组合并形成构件,由UART通信的初始化、接收和发送三种基本操作封装成三个独立对外的功能函数。加强UART通信的校验纠错性能,使得通信更稳定更可靠,并进行构件化,使得UART这种简洁通信方式有一个更好的应用前景。为了检测PC机与KL25 MCU以海明码校验技术通信的可行性,利用C#语言,运用海明码技术和串口控件进行编写PC端的程序,然后与KL25 MCU的评估板联机测试,完成了测试任务。该测试实例有利于辅助学生理解掌握海明码技术概念,所以该测试实例还被应用在硬件实验课上。     

Intangible assets and firm heterogeneity: Evidence from Italy

The positive impact of intangible assets on several measures of economic performance is well documented in the literature. Less clear is what initially leads firms to invest in intangible assets. The latter is particularly important because, at least for the Italian manufacturing sector, firms exhibit strong heterogeneity in their investments in intangible assets. In line with the capability-based theory of the firm, we argue that the firm's propensity to invest in intangible assets can be explained by factors that are internal and specific to the firm. Making use of a rich dataset, we test and provide support for our hypotheses. In particular, we find that the propensity to invest in intangible assets increases with the firm's size, human capital, and historical intangible asset base. This points towards the existence of a cumulative process of intangible asset accumulation, which may account for most of the heterogeneity observed in the data. The paper adds to the previous literature in two ways: first, it highlights the existence of strong intra-industry heterogeneity in intangible asset investments, and second, it offers an explanation for such heterogeneity.     

Periodic solutions for p-Laplacian neutral Liénard equation with a sign-variable coefficient

Using Lu's continuation theorem, the extension one of Manásevich-Mawhin, we study the existence of periodic solutions for p-Laplacian neutral Liénard equation of the form

(?_p(x(t)-cx(t-σ))^′)^′+f(x(t))x^′(t)+β(t)g(x(t-τ(t))=e(t).     

Do R&D subsidies affect SMEs’ access to external financing?

Many countries spend sizeable sums of public money on R&D grants to alleviate debt and equity gaps for small firms’ innovation projects. In making such awards, knowledgeable government officials may certify firms to private financiers. Using a unique Belgian dataset of 1107 approved requests and a control group of denied requests for a specific type of R&D grant, we examine the impact of subsidies on small firms’ access to external equity, short term and long term debt financing. We find that obtaining an R&D subsidy provides a positive signal about SME quality and results in better access to long-term debt.     

New product introduction and product tenure: What effects on firm growth?

This study contributes to the recent empirical literature on the innovation-firm performance relationship by investigating the effect of product introduction on firm growth in a sample of Italian firms from 2000 to 2006. We adopted a novel approach that exploits the interpretative content of the tenure of the last product introduced (i.e., the number of years since its first introduction) as an additional variable into the explanatory scheme of firm sales growth rate. This variable aims to capture peculiar characteristics of new goods, such as their novelty and complexity. The estimated results confirmed the relevance of this model specification and helps in understanding the reason why previous studies have failed to find a statistically robust relationship between product innovation and growth. Moreover, we found the following: first, the release of a new product enhances growth opportunity among multiproduct firms; second, product development promotes the growth of firms belonging to sectors with stronger commitment to research and development; and third, new product development enhances firm growth substantially in those sectors that absorb externally originated patents.     

On dynamic behavior of a hyperbolic system derived from a thermoelastic equation with memory type

In this paper, we study the Riesz basis property of the generalized eigenfunctions of a one-dimensional hyperbolic system in the energy state space. This characterizes the dynamic behavior of the system, particularly the stability, in terms of its eigenfrequencies. This system is derived from a thermoelastic equation with memory type. The asymptotic expansions for eigenvalues and eigenfunctions are developed. It is shown that there is a sequence of generalized eigenfunctions, which forms a Riesz basis for the Hilbert state space. This deduces the spectrum-determined growth condition for the C₀-semigroup associated with the system, and as a consequence, the exponential stability of the system is concluded.     

利用微生物转化维生素D3的研究(Ⅰ)--25(OH)D3的生物转化

根据目标菌株的生物学特征等筛选出若干菌株，还成功地利用入选菌株将维生素D3转化成为活性维生素D3——25(OH)D3，并采用已建立的薄层层析和高效液相色谱等检测方法对入选菌株的活性进行了鉴定。结果表明：放线菌菌株TN-955具有把维生素D3转化成为活性维生素D3——25(OH)D3的功能。     

Survivor: The role of innovation in firms’ survival

This paper explores the relationship between innovation and the survival probability of manufacturing firms in the Netherlands, conditional on firm age and size. The empirical analysis combines firm level data on innovation, derived from the second Community Innovation Survey, and on the date of exit, from the Business Register of all firms active in the Netherlands. To estimate the survival probability of a firm we use a non-parametric approach, based on the calculation of Transition Probability Matrices over different time periods. The results show that innovation has a positive and significant effect on the probability of firms’ survival. This effect increases over time and is conditional on firm age and size; we observe that small and young firms are the most exposed to the risk of exit, as found in earlier studies, but also those that most benefit of innovation to survive in the market, especially in the longer term.     

少儿古筝学习心理的把握与调适

古筝是我国传统音乐艺术宝库中最具代表性的器乐。弘扬古筝艺术，不仅是继承传统艺术的必须，也是落实民族文化大省建设，提高青少年文化素质的有效途径。少儿古筝学习热潮的掀起对艺术事业是一件好事。要提高古筝教育水平，促进这股热潮的蓬勃发展和长盛不衰，需要教学工作者孜孜不倦的热忱和深入细致的研究。科学把握和适时调整学习心理，则是这种研究工作的重要内容。     

发动机电子控制器的辐射骚扰测试研究

对发动机电子控制器的辐射骚扰测试方法进行分析,研究如何获得较理想的电磁场背景。介绍如何根据控制器的功能和电路特点来进行测试从而获得准确的测试数据。