The accession of Antoninus Pius saw a distinct change in imperial frontier policy in Britain. Upon taking power, Antoninus’ representative in Britain, Q. Lollius Urbicus,1 undertook the systematic re-occupation of lo...The accession of Antoninus Pius saw a distinct change in imperial frontier policy in Britain. Upon taking power, Antoninus’ representative in Britain, Q. Lollius Urbicus,1 undertook the systematic re-occupation of lowland Scotland and a new展开更多
目的观察iRoot Bp pIus在年轻恒牙创伤意外露髓后的疗效。方法选取2017年1月至2020年12月该院收治的年轻恒牙创伤意外露髓患者128例作为研究对象,采用随机数表法分为观察组和对照组,每组64例。对照组给予矿物三氧化聚合体直接盖髓填充...目的观察iRoot Bp pIus在年轻恒牙创伤意外露髓后的疗效。方法选取2017年1月至2020年12月该院收治的年轻恒牙创伤意外露髓患者128例作为研究对象,采用随机数表法分为观察组和对照组,每组64例。对照组给予矿物三氧化聚合体直接盖髓填充术治疗,观察组采用iRoot Bp pIus直接盖髓填充术治疗。比较两组患者临床疗效。结果两组患者术后3、6、12个月成功治愈率比较,差异均无统计学意义(P>0.05);观察组患者手术治疗、牙齿填充效果明显优于对照组,差异均有统计学意义(P<0.05)。结论在年轻恒牙创伤意外露髓后应用iRoot Bp pIus可改善患者症状,提高牙齿美观度,促进其早日康复。展开更多
互联网已经走进了小学生的日常生活，必须开发利用互联网带给他们的有益作用，改善或矫正负面影响。本研究针对北京城区高年级小学生互联网使用行为的特点以及“病理性互联网使用（Pathological Internet Use，简称PIU）”状况进行了抽...互联网已经走进了小学生的日常生活，必须开发利用互联网带给他们的有益作用，改善或矫正负面影响。本研究针对北京城区高年级小学生互联网使用行为的特点以及“病理性互联网使用（Pathological Internet Use，简称PIU）”状况进行了抽样调查和分析。调查结果显示：北京城区小学生普遍都有上网行为，使用者向低龄化发展趋势明显，每周上网时间较长、极少数有网吧上网经历、上网目的主要是娱乐。其中PIU学生的检出率为1．25％。小学生安全健康上网，还需要家长、学校、社会等多方积极引导。展开更多
For flat fast fading Multiple-Input Multiple-Output(MIMO) channels,this paper presents a sampling based channel estimation and an iterative Particle Filter(PF) signal detection scheme. The channel estimation is compri...For flat fast fading Multiple-Input Multiple-Output(MIMO) channels,this paper presents a sampling based channel estimation and an iterative Particle Filter(PF) signal detection scheme. The channel estimation is comprised of two parts:the adaptive iterative update on the channel distribution mean and a regular update on the "adaptability" via pilot. In the detection procedure,the PF is employed to produce the optimal decision given the known received signal and the sequence of the channel samples,where an asymptotic optimal importance density is constructed,and in terms of the asymptotic update order,the Parallel Importance Update(PIU) and the Serial Importance Update(SIU) scheme are performed respectively. The simulation results show that for the given fading channel,if an appropriate pilot mode is selected,the proposed scheme is more robust than the conventional Kalman filter based superimposed detection scheme.展开更多
文摘The accession of Antoninus Pius saw a distinct change in imperial frontier policy in Britain. Upon taking power, Antoninus’ representative in Britain, Q. Lollius Urbicus,1 undertook the systematic re-occupation of lowland Scotland and a new
文摘目的观察iRoot Bp pIus在年轻恒牙创伤意外露髓后的疗效。方法选取2017年1月至2020年12月该院收治的年轻恒牙创伤意外露髓患者128例作为研究对象,采用随机数表法分为观察组和对照组,每组64例。对照组给予矿物三氧化聚合体直接盖髓填充术治疗,观察组采用iRoot Bp pIus直接盖髓填充术治疗。比较两组患者临床疗效。结果两组患者术后3、6、12个月成功治愈率比较,差异均无统计学意义(P>0.05);观察组患者手术治疗、牙齿填充效果明显优于对照组,差异均有统计学意义(P<0.05)。结论在年轻恒牙创伤意外露髓后应用iRoot Bp pIus可改善患者症状,提高牙齿美观度,促进其早日康复。
文摘互联网已经走进了小学生的日常生活，必须开发利用互联网带给他们的有益作用，改善或矫正负面影响。本研究针对北京城区高年级小学生互联网使用行为的特点以及“病理性互联网使用（Pathological Internet Use，简称PIU）”状况进行了抽样调查和分析。调查结果显示：北京城区小学生普遍都有上网行为，使用者向低龄化发展趋势明显，每周上网时间较长、极少数有网吧上网经历、上网目的主要是娱乐。其中PIU学生的检出率为1．25％。小学生安全健康上网，还需要家长、学校、社会等多方积极引导。
基金the National Natural Science Foundation of China (No. 60672047)Shanghai Postdoctoral Scientific Program (No. 05R214110).
文摘For flat fast fading Multiple-Input Multiple-Output(MIMO) channels,this paper presents a sampling based channel estimation and an iterative Particle Filter(PF) signal detection scheme. The channel estimation is comprised of two parts:the adaptive iterative update on the channel distribution mean and a regular update on the "adaptability" via pilot. In the detection procedure,the PF is employed to produce the optimal decision given the known received signal and the sequence of the channel samples,where an asymptotic optimal importance density is constructed,and in terms of the asymptotic update order,the Parallel Importance Update(PIU) and the Serial Importance Update(SIU) scheme are performed respectively. The simulation results show that for the given fading channel,if an appropriate pilot mode is selected,the proposed scheme is more robust than the conventional Kalman filter based superimposed detection scheme.
