PC与单片机系统网络硬件电路设计

随着单片机的发展,其应用以从单机逐渐向多机或联网,而多机应用的关键又在于微机之间的相互通讯,互传数据信息。文章应用AT89C52单片机实现与计算机,多机之间主从式的串行通讯。并且在Visual Basic开发环境下,运用VB提供的通信控件,实现PC机与AT89C52单片机之间的串行通讯。     

WPBL教学法与PBL教学法在生理学教学中的比较研究

目的在前期研究问题为基础的学习（problem-based learning,PBL）基础上,进行基于网络的以问题为基础的学习（web problem-based learning,WPBL）与PBL教学法的比较研究,以为教学改革的研究提供实践基础和理论依据.方法2011级药学2、3班各54人共108人,分为WPBL教学组和PBL教学组.WPBL教学组对教学内容采用WPBL教学法实施教学,PBL教学组对教学内容采用PBL教学法实施教学.课程结束后,对两组学生的考试成绩进行统计学分析,并对教学方法和教学效果通过问卷调查方式进行评价.结果WPBL组与PBL组比较,学生的考试成绩优于对照组（P＜0.01）,及格率两者比较差异不显著（P＞0.05）;教学方法和效果评价方面,WPBL法比PBL法在提高学生分析解决问题的能力、学习的主观能动性和积极性,有效信息的摄取和师生间的交流方面存在更大的优越性（P＜0.05或P＜0.01）.结论WPBL教学法在生理学教学的应用中比PBL法有更大的优越性,值得推广.     

民办中等职业学校的发展研究——以海南省为例

民办中等职业学校曾经为中等职业教育的发展做出过重要贡献。在中等职业教育全免费时代即将来临之际,试以海南省为例,总结民办中等职业学校发展现状,分析其存在的主要问题,提出进一步发展的策略,显得尤为迫切。     

Novel mutation c.980_983delATTA compound with c.986C>A mutation of the FRMD7 gene in a Chinese family with X-linked idiopathic congenital nystagmus

Objective

To screen mutations in FERM domain-containing protein 7 (FRMD7) gene in two Chinese families with X-linked idiopathic congenital nystagmus (XLICN).

Methods

Common ophthalmic data and peripheral blood of two Chinese XLICN families (families A and B) were collected after informed consent. Genomic DNA was prepared from the peripheral blood of members of the two families and from 100 normal controls. Mutations in the FRMD7 gene were determined by directly sequencing polymerase chain reaction (PCR) products.

Results

We identified a novel mutation c.980_983delATTA compound with c.986C>A mutation in the 11th exon of FRMD7 in family B, and a previously reported splicing mutation c.782G>C (p.R261G) in family A. The mutations were detected in patients and female carriers, while they were absent in other relatives or in the 100 normal controls.

Conclusions

Our results expand the spectrum of FRMD7 mutations in association with XLICN, and further confirm that the mutations of FRMD7 are the underlying molecular mechanism for XLICN.     

Improvement of enamel bond strengths for conventional and resin-modified glass ionomers: acid-etching vs. conditioning

Objective:This study deals with the effect of phosphoric acid etching and conditioning on enamel micro-tensile bond strengths(μTBSs)of conventional and resin-modified glass ionomer cements(GICs/RMGICs).Methods:Forty-eight bovine incisors were prepared into rectangular blocks.Highly-polished labial enamel surfaces were either acid-etched,conditioned with liquids of cements,or not further treated(control).Subsequently,two matching pre-treated enamel surfaces were cemented together with one of four cements[two GICs:Fuji I(GC),Ketac Cem Easymix(3M ESPE);two RMGICs:Fuji Plus(GC),RelyX Luting(3M ESPE)]in preparation forμTBS tests.Pre-treated enamel surfaces and cement-enamel interfaces were analyzed by scanning electron microscopy(SEM).Results:Phosphoric acid etching significantly increased the enamelμTBS of GICs/RMGICs.Conditioning with the liquids of the cements produced significantly weaker or equivalent enamelμTBS compared to the control.Regardless of etching,RMGICs yielded stronger enamelμTBS than GICs.A visible hybrid layer was found at certain enamelcement interfaces of the etched enamels.Conclusions:Phosphoric acid etching significantly increased the enamelμTBSs of GICs/RMGICs.Phosphoric acid etching should be recommended to etch the enamel margins before the cementation of the prostheses such as inlays and onlays,using GICs/RMGICs to improve the bond strengths.RMGICs provided stronger enamel bond strength than GICs and conditioning did not increase enamel bond strength.     

西部地区高校图书馆特色馆藏建设现状分析与对策研究

在西部地区高校图书馆中,绝大多数图书馆重视特色馆藏建设,但仍存在对特色馆藏重视不足、馆际合作有待加强、学科相关的特色资源较少、获取的赠送资源少等问题.西部地区高校图书馆应成立专门的特色馆藏负责部门,开展特色馆藏建设的馆际合作,合理规划特色馆藏资源,加强特色馆藏的宣传,从而优化特色馆藏建设.表1.参考文献8.     

Gender,Sports, and New Media: Predictors of Viewing during the 2008 Beijing Olympics

The 2008 Beijing Olympics was the most watched television event in U.S. television history, and represented a broad expansion and emphasis on online sports content. This study examined audience's multiplatform experience with the 2008 Beijing Games, particularly the interactions between and among gender groups, viewing the Olympics, and use of new media. Results indicate that although men and women were significantly different in sports viewing and media use in general, they shared similarities in seeking Olympic content on various media platforms.     

微博机制和转发预测研究

微博机制和转发预测是当前学术研究的一个热点,具有重要的科学研究意义和经济社会价值.本文总结了基于图论的微博机制,对微博转发优化查询算法和预测技术的最新进展进行了系统归纳,明确指出了微博转发预测中用户特征所涉及的用户关系、用户影响力和用户兴趣算法等关键问题;以微博内容特征为切入点,分析了统计学方法、机器学习方法和网络拓扑分析方法的最新模型和技术应用框架;最后,提出了"六度分隔"理论范式、多层耦合网络中的微博用户行为预测、面向微博的"大数据"算法创新与知识挖掘等微博转发预测亟待突破的前沿性研究课题.     

关联科学核心词汇规范:提出、优化及展望

关联数据等技术的发展以及科学数据等科学资源共享制度的初步建立催生了关联科学这种全新的科学研究支撑方式。关联科学核心词汇规范(Linked Science Core Vocabulary Specification,LSC)为关联科学的实现提供了技术路径,但该规范还需要优化和扩展。为了实现关联科学核心词汇规范的功能,还需要解决开放科学数据、科学资源版权保护以及用LSC将科学研究模型化的主体等问题。     

国内外图书馆文化研究述评

基于对国内外图书馆文化研究文献的基本情况、研究方法、研究类型的文献计量统计,应用知识图谱分析确定3个研究主题,分别是图书馆文化的内涵研究、构建研究和测量与评价研究,总结国内外已有研究的成果和不足,比较分析国内外研究的差异,最后提出我国图书馆文化研究未来应重点关注本土化、文化建设过程和文化对图书馆组织发展的影响。