随着科学技术的快速发展,千兆以太网的普及和爆炸式增长,音频技术的创新和普及也步入了崭新的阶段。基于Dante技术,探讨了当前音频传输技术发展脉络趋势,并对音频信号的传输与分配的3个阶段进行分析比较。同时,透过Dante技术,简要分析了...随着科学技术的快速发展,千兆以太网的普及和爆炸式增长,音频技术的创新和普及也步入了崭新的阶段。基于Dante技术,探讨了当前音频传输技术发展脉络趋势,并对音频信号的传输与分配的3个阶段进行分析比较。同时,透过Dante技术,简要分析了Audio over Ethernet到Audio over IP技术的发展状况。展开更多
变延迟进动定制激发(Delays Alternating with Nutation for Tailored Excitation,DANTE)序列作为一种黑血预脉冲序列,通过连续施加小角度激发脉冲,以及结合散相梯度,使得流动物质和静态物质达到不同的稳态,从而抑制流动的血液.对于静...变延迟进动定制激发(Delays Alternating with Nutation for Tailored Excitation,DANTE)序列作为一种黑血预脉冲序列,通过连续施加小角度激发脉冲,以及结合散相梯度,使得流动物质和静态物质达到不同的稳态,从而抑制流动的血液.对于静态物质而言,施加DANTE序列后在图像等间隔的位置会出现暗条纹,暗条纹的宽度与梯度幅值和小单元持续时间乘积相关:乘积越大,暗纹宽度越小.对于动态物质而言,为达到较好的抑制效果,需要增加整个DANTE序列模块的准备时间,并且增大梯度幅值和小单元持续时间的乘积.因此,该方法对于梯度系统的要求较高,而实际梯度放大器(Gradient Amplifier,GPA)有一定的限额.在有限的GPA条件下,为使得DANTE序列具有更好抑制流动信号效果,本文在读出方向以及片层旋转两个方面进行了梯度优化,实现了更好的黑血效果.展开更多
目的探讨7.0 T磁共振上三维血管壁成像技术(DANTE-FLASH)进行ApoE-/-小鼠颈动脉粥样硬化斑块成像的可行性。方法通过数值仿真优化成像参数,实现血管腔-壁对比度最大化。6只ApoE-/-小鼠和3只野生型小鼠在7.0 T MRI均行DANTEFLASH和流入...目的探讨7.0 T磁共振上三维血管壁成像技术(DANTE-FLASH)进行ApoE-/-小鼠颈动脉粥样硬化斑块成像的可行性。方法通过数值仿真优化成像参数,实现血管腔-壁对比度最大化。6只ApoE-/-小鼠和3只野生型小鼠在7.0 T MRI均行DANTEFLASH和流入流出饱和带的多层2D RARE(2D-IOSB-RARE)两种扫描。在管壁信噪比(SNRwall)、管腔信噪比(SNRlumen)、壁-腔对比噪声比(CNR)、管腔面积(LA)、和管壁面积(WA)方面分别对2D-IOSB-RARE和DANTE-FLASH序列进行比较。对于LA与WA,使用线性回归分析评估MR图像与病理图像测量结果的相关性。结果根据数值仿真结果,小鼠实验的DANTE模块采用了15°翻转角与150脉冲链。相较于2D-IOSB-RARE,DANTE-FLASH的CNR轻微降低(P<0.001),但层分辨率显著提高。组内相关系数(LA:ICC=0.94,P<0.001;WA:ICC=0.93,P<0.001)和Bland-Altman图显示出DANTE-FLASH和2DIOSB-RARE在评估LA和WA测量结果方面具有良好的一致性。MR图像与病理图像在定量测量LA(P<0.0001)和WA(P<0.0001)中呈现较强相关性。结论在7.0 T磁共振上,三维DANTE-FLASH黑血MR序列,可实现各向同性高空间分辨率成像,有利于ApoE-/-小鼠颈动脉粥样硬化病变的灵活显示和定量评估。展开更多
This essay is twofold： the first part focuses on the interpretation of the concept of Hell in Dante＇s Inferno and Italian culture as depicted in Last Judgment scenes such as Giotto＇s in the Arena Chapel of Padua; S...This essay is twofold： the first part focuses on the interpretation of the concept of Hell in Dante＇s Inferno and Italian culture as depicted in Last Judgment scenes such as Giotto＇s in the Arena Chapel of Padua; Signorelli＇s in the Orvieto Cathedral; and Michelangelo＇s in the Sistine Chapel in Rome. The second part deals with the drawing illustrations for the text of Dante＇s Divine Comedy composed by the Florentine painters Sandro Botticelli, Giovanni Stradano, and Federico Zuccaro. Here the emphasis is on Dante＇s Inferno, which comments upon Neoplatonic personalities, Florentine politics, and current popular art. Comparisons with some of Botticelli＇s, Stradano＇s, and Zuccaro＇s drawing illustrations indicate the assimilation of classical artistic concepts such as Horace＇s ut pictura poesis [as is painting so is poetry] as well as Plato＇sfurorpoeticus [poetical inspiration] promoted in the writings of Marsilio Ficino, a Renaissance Neoplatonic philosopher.展开更多
文摘随着科学技术的快速发展,千兆以太网的普及和爆炸式增长,音频技术的创新和普及也步入了崭新的阶段。基于Dante技术,探讨了当前音频传输技术发展脉络趋势,并对音频信号的传输与分配的3个阶段进行分析比较。同时,透过Dante技术,简要分析了Audio over Ethernet到Audio over IP技术的发展状况。
文摘变延迟进动定制激发(Delays Alternating with Nutation for Tailored Excitation,DANTE)序列作为一种黑血预脉冲序列,通过连续施加小角度激发脉冲,以及结合散相梯度,使得流动物质和静态物质达到不同的稳态,从而抑制流动的血液.对于静态物质而言,施加DANTE序列后在图像等间隔的位置会出现暗条纹,暗条纹的宽度与梯度幅值和小单元持续时间乘积相关:乘积越大,暗纹宽度越小.对于动态物质而言,为达到较好的抑制效果,需要增加整个DANTE序列模块的准备时间,并且增大梯度幅值和小单元持续时间的乘积.因此,该方法对于梯度系统的要求较高,而实际梯度放大器(Gradient Amplifier,GPA)有一定的限额.在有限的GPA条件下,为使得DANTE序列具有更好抑制流动信号效果,本文在读出方向以及片层旋转两个方面进行了梯度优化,实现了更好的黑血效果.
文摘This essay is twofold： the first part focuses on the interpretation of the concept of Hell in Dante＇s Inferno and Italian culture as depicted in Last Judgment scenes such as Giotto＇s in the Arena Chapel of Padua; Signorelli＇s in the Orvieto Cathedral; and Michelangelo＇s in the Sistine Chapel in Rome. The second part deals with the drawing illustrations for the text of Dante＇s Divine Comedy composed by the Florentine painters Sandro Botticelli, Giovanni Stradano, and Federico Zuccaro. Here the emphasis is on Dante＇s Inferno, which comments upon Neoplatonic personalities, Florentine politics, and current popular art. Comparisons with some of Botticelli＇s, Stradano＇s, and Zuccaro＇s drawing illustrations indicate the assimilation of classical artistic concepts such as Horace＇s ut pictura poesis [as is painting so is poetry] as well as Plato＇sfurorpoeticus [poetical inspiration] promoted in the writings of Marsilio Ficino, a Renaissance Neoplatonic philosopher.
