目的探讨超声监测脐动脉和大脑中动脉搏动指数(PI)、阻力指数(RI)、收缩期与舒张期流速比(S/D)和主动脉峡部收缩指数(ISI)、峡部血流指数(IFI)与胎儿生长受限(FGR)的关系及对不良围产结局的预测价值。方法选择120例孕晚期孕妇,年龄21~41...目的探讨超声监测脐动脉和大脑中动脉搏动指数(PI)、阻力指数(RI)、收缩期与舒张期流速比(S/D)和主动脉峡部收缩指数(ISI)、峡部血流指数(IFI)与胎儿生长受限(FGR)的关系及对不良围产结局的预测价值。方法选择120例孕晚期孕妇,年龄21~41岁,平均年龄27.20岁(标准差5.19岁);孕周32~41周,平均孕周35.33周(标准差1.69周);产次1~3次,平均产次1.41次(标准差0.29次);高血压54例,糖尿病62例。将超声确诊为FGR的孕妇作为研究组(n=58),宫内胎儿正常发育孕妇作为对照组(n=62)。应用彩色多普勒超声监测子宫动脉、脐动脉及主动脉峡部血流参数。统计两组孕妇的妊娠结局。根据不同妊娠结局再次将研究组分为正常结局组和异常结局组,比较两组大脑中动脉、脐动脉及主动脉血流参数,并分析以上血流参数与新生儿体质量及新生儿Apgar评分的相关性。运用受试者工作特性(ROC)曲线分析血流参数对不良围产结局的预测价值。结果研究组脐动脉参数PI、RI及S/D值均较对照组明显偏高(1.23±0.15 vs 0.71±0.11、0.89±0.14 vs 0.52±0.08、3.67±0.33 vs 2.73±0.26。P<0.05)。大脑中动脉参数PI、RI及S/D值和主动脉峡部血流参数IFI、ISI值均明显低于对照组(1.11±0.13 vs 1.72±0.18、0.53±0.12 vs 0.87±0.14、2.43±0.26 vs 4.67±0.15、0.23±1.03 vs 1.26±0.05,-0.39±0.03 vs-0.39±0.03。P<0.05);研究组主动脉峡部舒张血流消失或反向发生率为34.48%,高于对照组(4.84%)(P<0.05)。研究组根据不同妊娠结局分为正常结局组31例和异常结局组27例,异常结局组新生儿体质量及Apgar评分均较正常结局组明显偏低[(3.18±0.35)分vs(3.97±0.34)分、(7.21±0.34)分vs(8.67±0.65)分。P<0.05]。异常结局组新生儿大脑中动脉PI、RI、S/D及IFI和ISI等血流参数均较正常结局组明显偏低(1.02±0.1 vs 1.33±0.17、0.53±0.07 vs 0.64±0.15、2.42±0.23 vs 2.52±0.14、0.08±0.01 vs 1.12±0.04、1.12±0.14 vs-0.32±0.01。P<0.05);异常结局组新生儿脐动脉PI、RI及S/D等血流参数显著高于正常结局组(1.46±0.17 vs 1.18±0.12、0.86±0.11 vs 0.72±0.03、3.91±0.45 vs 3.43±0.26。P<0.05)。新生儿大脑中动脉PI、RI及S/D值及主动脉IFI、ISI均与新生儿体质量和新生儿Apgar评分呈正相关,脐动脉PI、RI、S/D值与新生儿体质量和Apgar评分呈负相关(P<0.05)。ROC曲线分析显示,子宫中动脉、脐动脉及主动脉峡部血流参数联合诊断的曲线下面积最高,为0.968(95%CI 0.917~1.000)。结论子宫动脉、脐动脉及主动脉峡部血流参数异常均与FGR的发生密切相关,可辅助临床诊断FGR,联合检测3项血流参数诊断FGR的效能最高。超声监测脐动脉和大脑中动脉PI、RI、S/D和主动脉ISI、IFI可有效提高临床预测FGR预后的准确度。展开更多
The Chaotic Baseband Wireless Communication System(CBWCS)is expected to eliminate the Inter-Symbol Interference(ISI)caused by multipath propagation by using the optimal decoding threshold that is the sum of the ISI ca...The Chaotic Baseband Wireless Communication System(CBWCS)is expected to eliminate the Inter-Symbol Interference(ISI)caused by multipath propagation by using the optimal decoding threshold that is the sum of the ISI caused by past decoded bits and the ISI caused by future transmitting bits.However,the current technique is only capable of removing partial effects of the ISI,because only past decoded bits are available for the suboptimal decoding threshold calculation.The unavailability of the future information needed for the optimal decoding threshold is an obstacle to further improve the Bit Error Rate(BER)performance.In contrast to the previous method using Echo State Network(ESN)to predict one future bit,the proposed method in this paper predicts the optimal decoding threshold directly using ESN.The proposed ESN-based threshold prediction method simplifies the symbol decoding operation by avoiding the iterative prediction of the output waveform points using ESN and accumulated error caused by the iterative operation.With this approach,the calculation complexity is reduced compared to the previous ESN-based approach.The proposed method achieves better BER performance compared to the previous method.The reason for this superior result is twofold.First,the proposed ESN is capable of using more future symbols information conveyed by the ESN input to obtain more accurate threshold rather than the previous method in which only one future symbol was available.Second,the proposed method here does not need to estimate the channel information using Least Squared(LS)method,which avoids the extra error caused by inaccurate channel information estimation.Simulation results and experiment based on a wireless open-access research platform under a practical wireless channel show the effectiveness and superiority of the proposed method.展开更多
Salim Barakat is a Kurdish author, yet his works are highly regarded for their mastery of Arabic. To achieve his impossible goal of presenting a true picture of the dire condition of the Syrian Kurdish communities, sp...Salim Barakat is a Kurdish author, yet his works are highly regarded for their mastery of Arabic. To achieve his impossible goal of presenting a true picture of the dire condition of the Syrian Kurdish communities, specifically the Yazidis’ genocide in his novel The Captives of Sinjar, he resorts to Latin American magical realism and a convoluted writing style. Characters are not what they seem and every natural thing is a sentient being. The narrative traces the ghostly lives and deaths of five captive Yazidi girls and their five ISIS fighter-masters. The protagonist, Sarat, a fictional image of Barakat, is a painter, who lives and works by a secluded lakeside in Sweden. His work is influenced by the horrific imaginations of famous European artists. This paper accents the novel’s deep structure of collective memories of individuals and communities as addressed by the modern philosophers: Theodor Adorno, Maurice Blanchot, and Maurice Halbwachs.展开更多
目的分析近年来全球循证护理研究态势,了解国内外发展差距,为我国循证护理发展提供参考。方法基于Webof Science,以主题=[(evidence based nursing)or(evidence-based nursing)]或主题=[(nursing or nurse)and(system reviewor systemat...目的分析近年来全球循证护理研究态势,了解国内外发展差距,为我国循证护理发展提供参考。方法基于Webof Science,以主题=[(evidence based nursing)or(evidence-based nursing)]或主题=[(nursing or nurse)and(system reviewor systematic review)]或主题=[(nursing or nurse)and(RCT or randomized controlled trail)]进行文献检索,时间跨度为2007年至2013年6月15日。结果近年来全球循证护理研究文献发表呈上升趋势,美国在该领域具有绝对优势,加拿大、英国、澳大利亚也是主要的研究国家;加拿大阿尔伯塔大学是最重要的研究机构;最新的研究热点是卫生保健及健康服务、职业安全及职业教育、护理实践等。中国大陆论文发表量排名第10,主要贡献来自香港地区,内地主要来自第二军医大学、山东大学、复旦大学、四川大学、北京大学等,但被引频次都较低。结论中国循证护理研究形势不容乐观,与国际主流的差距较大,需要强化循证观念,加强护士的教育培训。展开更多
结合国内图书馆普遍开展的论文引证检索服务的实际需求,在大量工作实践的基础上,设计并实现了一款基于ISI Web of Knowledge平台检索结果引证检索统计报告的软件,能够根据不同的统计指标,对检索结果进行快速统计。实践证明,该软件提高...结合国内图书馆普遍开展的论文引证检索服务的实际需求,在大量工作实践的基础上,设计并实现了一款基于ISI Web of Knowledge平台检索结果引证检索统计报告的软件,能够根据不同的统计指标,对检索结果进行快速统计。实践证明,该软件提高了工作效率的同时,保证了正确率。展开更多
目的:探讨代谢综合征不同中医证型中胰岛素抵抗的差异性。方法:通过对100例代谢综合症的患者进行中医证型的分类,并观察不同中医证型中胰岛素抵抗(胰岛素敏感指数)的差异性。结果:发现MS各组患者的胰岛素敏感指数(insul in sensitivity ...目的:探讨代谢综合征不同中医证型中胰岛素抵抗的差异性。方法:通过对100例代谢综合症的患者进行中医证型的分类,并观察不同中医证型中胰岛素抵抗(胰岛素敏感指数)的差异性。结果:发现MS各组患者的胰岛素敏感指数(insul in sensitivity index ISI)显著低于正常对照组(P<0.01)。而中医各证型均存在不同程度的胰岛素抵抗水平降低的现象,其值随证型的演变而变化。具体为气阴两虚证<阴虚热盛证<痰瘀互结证<痰浊阻遏(P<0.05)。结论:ISI可反映MS的严重程度,可将ISI作为代谢综合征的中医辨证的客观指标,具有较好的特异性。展开更多
The general situation of Web of Science,a new product of Institute for Scientific Information,USA,is introduced,including its coverage,characteristics and new collections.Its functions are also assessed.
翻转课堂教学模式已经成为近年来教育界关注的热点,各类有关翻转课堂的文献大量涌现。为了更加清楚地掌握该模式的研究现状,本文以翻转课堂的文献为研究对象,以国内的学术期刊数据库CNKI和国外的"ISI Web of Science"两个大...翻转课堂教学模式已经成为近年来教育界关注的热点,各类有关翻转课堂的文献大量涌现。为了更加清楚地掌握该模式的研究现状,本文以翻转课堂的文献为研究对象,以国内的学术期刊数据库CNKI和国外的"ISI Web of Science"两个大型数据库作为数据来源,利用文献计量方法对翻转课堂相关文献的年载文量和年增长、文献来源、研究内容、著者分布、文献被引频次等进行分析,以期为翻转课堂的深入研究与广泛应用提供借鉴和参考。展开更多
文摘目的探讨超声监测脐动脉和大脑中动脉搏动指数(PI)、阻力指数(RI)、收缩期与舒张期流速比(S/D)和主动脉峡部收缩指数(ISI)、峡部血流指数(IFI)与胎儿生长受限(FGR)的关系及对不良围产结局的预测价值。方法选择120例孕晚期孕妇,年龄21~41岁,平均年龄27.20岁(标准差5.19岁);孕周32~41周,平均孕周35.33周(标准差1.69周);产次1~3次,平均产次1.41次(标准差0.29次);高血压54例,糖尿病62例。将超声确诊为FGR的孕妇作为研究组(n=58),宫内胎儿正常发育孕妇作为对照组(n=62)。应用彩色多普勒超声监测子宫动脉、脐动脉及主动脉峡部血流参数。统计两组孕妇的妊娠结局。根据不同妊娠结局再次将研究组分为正常结局组和异常结局组,比较两组大脑中动脉、脐动脉及主动脉血流参数,并分析以上血流参数与新生儿体质量及新生儿Apgar评分的相关性。运用受试者工作特性(ROC)曲线分析血流参数对不良围产结局的预测价值。结果研究组脐动脉参数PI、RI及S/D值均较对照组明显偏高(1.23±0.15 vs 0.71±0.11、0.89±0.14 vs 0.52±0.08、3.67±0.33 vs 2.73±0.26。P<0.05)。大脑中动脉参数PI、RI及S/D值和主动脉峡部血流参数IFI、ISI值均明显低于对照组(1.11±0.13 vs 1.72±0.18、0.53±0.12 vs 0.87±0.14、2.43±0.26 vs 4.67±0.15、0.23±1.03 vs 1.26±0.05,-0.39±0.03 vs-0.39±0.03。P<0.05);研究组主动脉峡部舒张血流消失或反向发生率为34.48%,高于对照组(4.84%)(P<0.05)。研究组根据不同妊娠结局分为正常结局组31例和异常结局组27例,异常结局组新生儿体质量及Apgar评分均较正常结局组明显偏低[(3.18±0.35)分vs(3.97±0.34)分、(7.21±0.34)分vs(8.67±0.65)分。P<0.05]。异常结局组新生儿大脑中动脉PI、RI、S/D及IFI和ISI等血流参数均较正常结局组明显偏低(1.02±0.1 vs 1.33±0.17、0.53±0.07 vs 0.64±0.15、2.42±0.23 vs 2.52±0.14、0.08±0.01 vs 1.12±0.04、1.12±0.14 vs-0.32±0.01。P<0.05);异常结局组新生儿脐动脉PI、RI及S/D等血流参数显著高于正常结局组(1.46±0.17 vs 1.18±0.12、0.86±0.11 vs 0.72±0.03、3.91±0.45 vs 3.43±0.26。P<0.05)。新生儿大脑中动脉PI、RI及S/D值及主动脉IFI、ISI均与新生儿体质量和新生儿Apgar评分呈正相关,脐动脉PI、RI、S/D值与新生儿体质量和Apgar评分呈负相关(P<0.05)。ROC曲线分析显示,子宫中动脉、脐动脉及主动脉峡部血流参数联合诊断的曲线下面积最高,为0.968(95%CI 0.917~1.000)。结论子宫动脉、脐动脉及主动脉峡部血流参数异常均与FGR的发生密切相关,可辅助临床诊断FGR,联合检测3项血流参数诊断FGR的效能最高。超声监测脐动脉和大脑中动脉PI、RI、S/D和主动脉ISI、IFI可有效提高临床预测FGR预后的准确度。
文摘The Chaotic Baseband Wireless Communication System(CBWCS)is expected to eliminate the Inter-Symbol Interference(ISI)caused by multipath propagation by using the optimal decoding threshold that is the sum of the ISI caused by past decoded bits and the ISI caused by future transmitting bits.However,the current technique is only capable of removing partial effects of the ISI,because only past decoded bits are available for the suboptimal decoding threshold calculation.The unavailability of the future information needed for the optimal decoding threshold is an obstacle to further improve the Bit Error Rate(BER)performance.In contrast to the previous method using Echo State Network(ESN)to predict one future bit,the proposed method in this paper predicts the optimal decoding threshold directly using ESN.The proposed ESN-based threshold prediction method simplifies the symbol decoding operation by avoiding the iterative prediction of the output waveform points using ESN and accumulated error caused by the iterative operation.With this approach,the calculation complexity is reduced compared to the previous ESN-based approach.The proposed method achieves better BER performance compared to the previous method.The reason for this superior result is twofold.First,the proposed ESN is capable of using more future symbols information conveyed by the ESN input to obtain more accurate threshold rather than the previous method in which only one future symbol was available.Second,the proposed method here does not need to estimate the channel information using Least Squared(LS)method,which avoids the extra error caused by inaccurate channel information estimation.Simulation results and experiment based on a wireless open-access research platform under a practical wireless channel show the effectiveness and superiority of the proposed method.
文摘Salim Barakat is a Kurdish author, yet his works are highly regarded for their mastery of Arabic. To achieve his impossible goal of presenting a true picture of the dire condition of the Syrian Kurdish communities, specifically the Yazidis’ genocide in his novel The Captives of Sinjar, he resorts to Latin American magical realism and a convoluted writing style. Characters are not what they seem and every natural thing is a sentient being. The narrative traces the ghostly lives and deaths of five captive Yazidi girls and their five ISIS fighter-masters. The protagonist, Sarat, a fictional image of Barakat, is a painter, who lives and works by a secluded lakeside in Sweden. His work is influenced by the horrific imaginations of famous European artists. This paper accents the novel’s deep structure of collective memories of individuals and communities as addressed by the modern philosophers: Theodor Adorno, Maurice Blanchot, and Maurice Halbwachs.
文摘目的分析近年来全球循证护理研究态势,了解国内外发展差距,为我国循证护理发展提供参考。方法基于Webof Science,以主题=[(evidence based nursing)or(evidence-based nursing)]或主题=[(nursing or nurse)and(system reviewor systematic review)]或主题=[(nursing or nurse)and(RCT or randomized controlled trail)]进行文献检索,时间跨度为2007年至2013年6月15日。结果近年来全球循证护理研究文献发表呈上升趋势,美国在该领域具有绝对优势,加拿大、英国、澳大利亚也是主要的研究国家;加拿大阿尔伯塔大学是最重要的研究机构;最新的研究热点是卫生保健及健康服务、职业安全及职业教育、护理实践等。中国大陆论文发表量排名第10,主要贡献来自香港地区,内地主要来自第二军医大学、山东大学、复旦大学、四川大学、北京大学等,但被引频次都较低。结论中国循证护理研究形势不容乐观,与国际主流的差距较大,需要强化循证观念,加强护士的教育培训。
文摘目的:探讨代谢综合征不同中医证型中胰岛素抵抗的差异性。方法:通过对100例代谢综合症的患者进行中医证型的分类,并观察不同中医证型中胰岛素抵抗(胰岛素敏感指数)的差异性。结果:发现MS各组患者的胰岛素敏感指数(insul in sensitivity index ISI)显著低于正常对照组(P<0.01)。而中医各证型均存在不同程度的胰岛素抵抗水平降低的现象,其值随证型的演变而变化。具体为气阴两虚证<阴虚热盛证<痰瘀互结证<痰浊阻遏(P<0.05)。结论:ISI可反映MS的严重程度,可将ISI作为代谢综合征的中医辨证的客观指标,具有较好的特异性。
文摘The general situation of Web of Science,a new product of Institute for Scientific Information,USA,is introduced,including its coverage,characteristics and new collections.Its functions are also assessed.
文摘翻转课堂教学模式已经成为近年来教育界关注的热点,各类有关翻转课堂的文献大量涌现。为了更加清楚地掌握该模式的研究现状,本文以翻转课堂的文献为研究对象,以国内的学术期刊数据库CNKI和国外的"ISI Web of Science"两个大型数据库作为数据来源,利用文献计量方法对翻转课堂相关文献的年载文量和年增长、文献来源、研究内容、著者分布、文献被引频次等进行分析,以期为翻转课堂的深入研究与广泛应用提供借鉴和参考。
