关于N(2,2,0)代数的弱幂零元的若干结果(英文)

引入了N(2,2,0)代数的弱幂元的概念,讨论了其弱幂元的若干性质.     

一种基于关系视频盲水印算法

针对视频水印的特征,提出一种利用视频帧采样点均值曲线相交性确定嵌入帧的方法：在水印信息嵌入时,利用嵌入帧三个亮度最大分块位置关系和DC值大小实现每帧2bit信息的嵌入。实验证明,该算法对常规攻击具有良好的鲁棒性。     

半B-(E,F)-凸规划的性质

研究了半B-(E,F)-凸规划的可行解集、最优解集的基本性质,随后研究了在半B-(E,F)-凸性条件的限制下使得局部最优解成为全局最优解及全局最优解的唯一性,这些结论对于半B-(E,F)-凸规划的最优性条件的研究提供了必要的理论支持。     

基于灰色模型的建筑物沉降预测方法

针对灰色模型在建筑物沉降预测中存在的不足,对传统的灰色模型进行改进,提出利用时间差法和Newton插值法将非等间距的原始数据序列转换为等间距数据序列,然后采用GM（1,1）模型和两种加权法对等间距数据进行建模的预测方法。并通过实例进行精度分析,实例证明利用Newton插值法构造等间距数据,采用基于时间加权的模型对沉降进行预测具有较高的精度。采用该模型对建筑物沉降趋势进行预测,为施工决策起到良好的参考作用。     

卫星定位系统多径实时抑制技术研究

全球卫星导航系统给交通带来极大便利。地面接收到的卫星信号存在多径,给定位导航带来不利影响。本文在前期研究多径抑制技术的基础上,为了提高多径抑制的实时性,提出了若干加快多径抑制的方案。     

Watching MOOCs together: investigating co-located MOOC study groups

Research suggests that massive open online course (MOOC) students prefer to study in groups, and that social facilitation within the study groups may render the learning of difficult concepts a pleasing experience. We report on a longitudinal study that investigates how co-located study groups watch and study MOOC videos together. The study was conducted with on-campus flipped classroom students. Our subjects reported an overall high satisfaction with the study group style. The research reveals that students like to stay synchronized in the group while watching MOOC videos. However, they have to find a balance between synchronization, video interaction, and the amount of conversation. Watching MOOCs on a shared display addresses the need of synchronicity, and the distribution of control can increase the video interactivities.     

匹伐他汀钙对高胆固醇血症患者动脉粥样硬化的影响（英文）

目的:观察匹伐他汀钙对高胆固醇血症患者外周血管的影响。创新点:首次在国内发现匹伐他汀钙能够改善高胆固醇血症患者肱动脉和颈动脉血管内皮功能而且延缓其动脉粥样硬化发展,并首次证实改善内皮功能是匹伐他汀钙延缓其动脉粥样硬化发展的重要原因。方法:按照入选排除标准,选取本院高胆固醇血症患者(HC),完成超声心动图检查的40例。根据剂量不同,分为两个剂量组:1 mg剂量组20例(男性5例,女性15例,平均年龄(55.20±8.35)岁),2 mg剂量组20例(男性9例,女性11例,平均年龄(57.56±6.09)岁)。访视结束后完成超声心动图检查的HC组36例,两个剂量组分别有2人失访。治疗后1 mg剂量组18例(男性3例,女性15例,平均年龄(56.00±7.85)岁),2 mg剂量组18例(男性7例,女性11例,平均年龄(57.79±6.46)岁)。选择本院同期体检中心30例正常人作为对照(年龄和性别均与病例组匹配,男性14例,女性16例,平均年龄(54.94±6.90)岁)。所有研究对象,均经隔夜禁食12~14小时,次日清晨抽取空腹肘静脉血,测定临床生化指标。采用Sequia512彩色多普勒超声诊断仪,应用高分辩率外周血管超声技术,检测HC治疗前后肱动脉血流介导性舒张功能(FMD)、颈动脉结构和功能。结论:经匹伐他汀钙治疗8周后,高胆固醇血症患者血管功能明显改善,表现为FMD升高,僵硬度减小;颈动脉僵硬度和内中膜厚度(IMT)延缓进展与其内皮功能改善密切相关。     

信息技术在小学教育体育专业田径普修课教学中的应用

信息技术应用于小学教育体育专业田径普修课教学是提高教学质量的有效方法。优化教学内容和拓宽教学时空应加强开发互联网资源,发挥理论指导实践及两者相互渗透应制作田径多媒体课件,提高学生参与主动性应使用视频图像技术记录和分析学生技能表现,实现对学生进行过程性评价应充分利用计算机管理优势。     

Removal of aqueous phenol compound by vacuum membrane distillation

1.IntroductionPhenolisanimportantchemicalindustrymaterial,butitalsoaboundswithserioushazardtoenvironmentandthreatstohumanhealth.Rigidruleshavebeenmadeoutonthephenoldischargeconcentration.Researchesonthetreatmentofphenolwastewaterwerecarriedoutinvariouscountries[1-5].Membraneseparationmethodsincludingreverseosmosis,ultrafiltrationandpervaporationhaveattractedmuchattentionforphenolwastewatertreatment,withcelluloseacetate(CA)membraneemployedmostly[6].Membranedistillationisanewmembraneseparation…     

Effect of interrupted endogenous BMP/Smad signaling on growth and steroidogenesis of porcine granulosa cells

Bone morphogenetic proteins (BMPs) play a critical role in the growth and steroidogenesis of granulosa cells (GCs). BMP signals act through membrane-bound heteromeric serine/threonine kinase receptors. Upon ligand binding, BMPs activate intracellular Smad proteins and regulate growth and apoptosis in various cell types. The objective of this study was to demonstrate the effects of BMP/Smad signal on growth and steroidogenesis of porcine GCs. A strategy of RNA interference (RNAi)-mediated ‘gene silencing’ of Smad4, a core molecule mediating the intracellular BMP/Smad signal transduction pathways, was used to interrupt endogenous BMP/Smad signaling. Results indicate that Smad4-small interfering RNA (siRNA) caused specific inhibition of Smad4 mRNA and protein expression after transfection. Interrupted endogenous BMP/Smad signaling significantly inhibited growth, and induced apoptosis of porcine GCs, while decreasing estradiol production. In addition, interrupted BMP/Smad signaling significantly (P<0.05) changed the expression of Cyclin D2, CDK4, Bcl-2, and Cyp19a1. These findings provide new insights into how BMP/Smad signaling regulates the growth and steroidogenesis of porcine GCs.