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71.
数字电路系统设计与制作的一般方法   总被引:1,自引:0,他引:1  
介绍一种数字电路系统设计与制作的一般方法。分析数字电路系统的各组成电路作用和设计原则,把复杂的数字电路系统逐步划分成不同层次、相对独立的子系统;通过对子系统的逻辑关系、时序等的分析,选用合适的各种中大规模集成数字电路器件来实现;按照由大到小,由整体到局部,再由小到大,由局部到整体的设计方法进行系统设计,实现利用现有的数字电路器件来设计与制作具有各种复杂逻辑关系的数字电路系统。  相似文献   
72.
While some governments in Sub-Saharan Africa have abolished tuition to achieve universal primary education (UPE), few studies have examined the impacts of the UPE policy beyond school enrolment. This study estimates the impact of the UPE policy in Uganda on overall primary education attainments by using data including 940 rural households. We find that UPE has decreased delayed enrolments and increased grade completion rates up to the fifth grade and its effects are especially large among girls in poor households. Yet, schools in Uganda still face further challenges in terms of low internal efficiency and the unequal quality of education.  相似文献   
73.
已成为PC标准的通用串行总线USB为多点数据采集提供了很大的便利。利用USB可以实现较传统方式更有效、更经济、点数更多的数据采集。本文介绍了如何利用USB接口来实现多点数据采集。  相似文献   
74.
本文从分析墨子"兼爱"和"利"这两个基本概念出发,得出墨子提出这两个概念的内在逻辑一致性,这就为"兼相爱"与"交相利"的关系埋下了伏笔。继而从墨子主张"兼爱"为什么要言"利"以及墨子解决问题的逻辑和表述逻辑出发,得出"兼相爱"是本,"交相利"是末的结论,从而对"墨子哲学为功利主义"的论断提出作者的看法。  相似文献   
75.
设计了一种简单的实验装置,可同时测量分子间相互作用的势能和普适气体常量R。其实验曲线符合理论值,误差分析后的补偿曲线所得结果可较为精确地与理论结果吻合。该实验常温下即可进行,且精度较高。该装置可用于课堂教学,有利于学生对热学问题的深入理解。  相似文献   
76.
The National Broadband Plan (NBP) recently announced by the Federal Communication Commission visualizes a significantly enhanced commitment to public computing centers (PCCs) as an element of the Commission's plans for promoting broadband availability. In parallel, the National Telecommunications and Information Administration (NTIA) has channelized part of the Broadband Technology Opportunities Program (BTOP) funding to PCCs. However, BTOP funding was the result of an unprecedented economic crisis, and is unlikely to be repeated. Future programs will need to evolve criteria for selecting projects for funding that maximize their cost-effectiveness. We argue in this paper that basing funding for PCCs on broadband availability (or non-availability), is not as cost-effective as considering a broader array of factors related to demand for internet access at public computer centers. We use data on public libraries from the National Center of Educational Statistics to identify factors predicting high demand for internet access at PCCs. Based on this analysis, we argue that low demand markets may benefit more from consumer outreach and digital literacy programs, than from infrastructure deployment. Also, we argue that markets with high availability, should receive more funding if there is high demand as well, as predicted by our model.  相似文献   
77.
USB技术释析     
USB( Universal Serial Bus) ,“通用串行总线”接口 ,是一种简单的计算机外围接口标准。它具有即插即用、方便扩展等优点 ,已成为计算机的必备接口。本文论述了 USB的系统拓扑结构、数据传输方式及USB接口的应用和发展前景。  相似文献   
78.
通用串行总线USB为多点数据采集提供了很大的便利,它可以实现较传统方式更有效、更经济、点数更多的数据采集。  相似文献   
79.
With equal access requirements and increasing rates of enrolment of students with disabilities in higher education, universities must find appropriate and efficient ways to create accessible materials which benefit and support all students. In response to cuts to disability funding, issues relating to the provision of an inclusive curriculum are now dominating institutional policy and educational discourses. This paper reports on a trans-Atlantic project which utilised student employees to convert and develop inclusive learning materials for their peers, with the expressed purpose of piloting a sustainable intervention method generalisable to meeting similar needs of diverse universities for inclusive material provision and a future workforce aware of disability issues and accommodations. Qualitative in-depth interviews with ten students (eight UK and two US) find that involving student employees in the delivery of inclusive materials improves partnerships and attitudes around disability and accessibility measures.  相似文献   
80.
SWOT即Strength优势、Weakness劣势、Opportunities机会、Threats威胁的简称,SW是内部因素,OT是外部因素。本文拟对邢台采取SWOT分析,对邢台经济增长背后所具备的优势、劣势以及所面临的机会与威胁进行分析,以便提升邢台经济的核心竞争力、持续竞争力、国际竞争力,从而为邢台的经济进一步发展提出建议和对策。以盼邢台能够更快更好的发展。  相似文献   
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