基于SPMC75F2413A的感应电机开环V/F控制

给出了一种基于SPMC75F2413A的感应电机开环V/F控制的一种实现方法。SPMC75F2413A接收来自键盘或是PC机通信接口的控制信息产生相应的SPWM驱动信号,实现AC变频马达的V/F开环变频驱动功能。     

CIP-I智能人工腿步速控制系统硬件设计

CIP-I Leg是国内首个智能仿生人工腿原型机。针对智能仿生人工腿应能模仿人体健康腿的运动方式且步行速度可自然、随意地跟随截肢者步行速度的变化而变化的重要特点,同时考虑到高精度、低功耗和抗干扰能力强等,设计了一种基于新型超低功耗微处理器MSP430F149的人工腿步速控制系统硬件电路。实验结果表明,所设计的步速控制系统运行可靠、功耗低、精度高,可有效地用于自行设计的CIP-I Leg的控制。     

基于以太网的嵌入式系统网络接口模块设计及应用

嵌入式系统已经广泛应用在工厂自动化、测绘、水电、环保、国防等领域,但它们大都不具备网络互连能力,极大限制了设备使用、控制和数据交换性能,因而急需网络接口模块。结合最新计算机技术、网络技术、通讯技术,介绍了设计此嵌入式系统网络接口模块所需要的核心以太网控制器CS8900A,分析网络底层工作机理,采用高速高性能的C8051F005微控制器与以太网控制器CS8900A和接口芯片MAX232相连接实现网络接口模块设计,对接口电路作了详细的阐述,并对系统控制软件进行了具体的分析。该模块用途广泛,具有良好的应用前景。     

Technology and the generation of international knowledge spillovers: An application to Spanish manufacturing firms

In the continuing debate about the positive versus negative effects of inward investments in a host economy, a new perspective has arisen from new firms’ strategy nowadays to internationalise their activity. One aspect is that knowledge that is not completely appropriable by foreign affiliates abroad may spill over into domestic firms. In the absence of conclusive evidence, two questions can be put forward: the first concerns the role played by technology in the generation of those external effects; the second, the micro-assessment of the dynamics of technological spillovers. In this paper, results show that benefits for domestic firms in Spain differ across industries by their technological content. The hypothesis of spillover dynamics is tested and supported by the availability of panel data for manufacturing firms in the 1990s.     

泰山苋的名实问题

发现泰山苋 A．taishanensis F．Z．Li et C．K．Ni即为源于美洲的合被苋 A．Polygonoides L .,故于归并。     

Resources, capabilities, risk capital and the creation of university spin-out companies

The commercialization of university research has become an increasingly important issue, given concerns regarding licensing and the university's desire to maximize the returns to intellectual property (IP). In this paper, we assess the impact of university resources and routines/capabilities on the creation of spin-out companies. We find that both the number of spin-out companies created and the number of spin-out companies created with equity investment are significantly positively associated with expenditure on intellectual property protection, the business development capabilities of technology transfer offices and the royalty regime of the university. These results highlight the importance not just of resource stocks, but also of developing appropriate capabilities of technology transfer officers in spinning-out companies. The results suggest that universities and policy-makers need to devote attention to the training and recruitment of technology officers with the broad base of commercial skills.     

TMS320F2812在运动控制器中的应用

在运动控制技术分析的基础上,实现了基于PCI总线和DSP运动控制系统的硬件设计。以开放式运动控制器为例,详细介绍了以F2812DSP为核心的外围电路设计和PCI总线通讯接口设计,包括DSP的PCI接口设计和PCI通讯局部总线设计等。     

Interregional inventor networks as studied by patent coinventorships

We study the structure of the interregional inventor networks in Sweden by examining the residence of inventors and coinventors involved in Swedish patent applications to the European Patent Office. Several factors are found to influence the spatial affinity of regions. We find that spatial affinity extends beyond the region if it has less own R&D-related resources (business R&D, university R&D and patenting); if it is close to the other region and if it is relatively small. The resources of that other region plays a positive role if, in analogue fashion, that region has more R&D-related resources.     

How to allocate R&D (and other) subsidies: An experimentally tested policy recommendation

This paper evaluates the typically applied rules for awarding R&D subsidies. We identify two sources of inefficiency: the selection based on a ranking of individual projects, rather than complete allocations, and the failure to induce competition among applicants in order to extract and use information about the necessary funding. In order to correct these inefficiencies we propose mechanisms that include some form of an auction in which applicants bid for subsidies. Our proposals are tested in a simulation and in controlled lab experiments. The results suggest that adopting our proposals may considerably improve the allocation.     

丹瓜方对转基因糖尿病小鼠心脏损伤的作用

探讨丹瓜方对转基因糖尿病小鼠心脏组织的影响。32只ApoE-/-小鼠数字随机等分为模型组、丹瓜方组、联合用药组(丹瓜方+吡格列酮)、吡格列酮组。喂以普通饲料,各组分别给药12周。小鼠处死,取心脏、匀浆,免疫组化测心脏血清反应因子(SRF)含量;解剖冠状动脉,光镜观察比较。结果:与模型组比较,联合用药组与丹瓜方组SRF阳性率降低有显著性差异(P<0.01);形态学观察,丹瓜方组与联合用药组冠状动脉内膜大部分无增厚。结果表明:丹瓜方对糖尿病小鼠心脏具有保护作用。