随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time l...随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time linear equalizer,CTLE),该均衡器采用2级级联结构来补偿信道衰减,并提高接收信号的质量。此外,自适应模块通过采用符号-符号最小均方误差(sign-sign least mean square,SS-LMS)算法,使抽头系数加快了收敛速度。仿真结果表明,当传输速率为16 Gbit/s时,均衡器可以补偿-15.53 dB的半波特率通道衰减,均衡器系数在16×10^(4)个单元间隔数据内收敛,并且收敛之后接收误码率低于10^(-12)。展开更多
This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 ...This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 steel plates of 9 mm, 10 mm, and 12 mm thicknesses. The ballistic limit velocity was calculated using two standard methods, MIL-STD-662F and NIJ-STD-0101.06, and additionally using a support vector machine algorithm. The results show a linear relationship between the plate thickness and ballistic limit velocity. Further, the relative penetration performance among five different small caliber projectiles was analyzed using the Penetration Performance Ratio(PPR) introduced in this study, which suggests the potential of PPR to predict the ballistic limit velocity of other untested materials and/or different projectiles.展开更多
目的对比逐层匀场技术(iShim-DWI)与单次激发平面回波成像(SS-EPI)应用于肺部占位性病变MR检查中成像质量的差异。方法前瞻性收集2017年9月至2023年3月经CT检查证实存在肺占位病变的患者的MR图像。所有患者均使用3.0 T MRI检查仪行SS-EP...目的对比逐层匀场技术(iShim-DWI)与单次激发平面回波成像(SS-EPI)应用于肺部占位性病变MR检查中成像质量的差异。方法前瞻性收集2017年9月至2023年3月经CT检查证实存在肺占位病变的患者的MR图像。所有患者均使用3.0 T MRI检查仪行SS-EPI、iShim-DWI及T 2WI扫描。以T 2WI-haste图像为参考,由2名放射科医生采用五分法对2种DWI图像整体质量评分,Kappa检验用来评价2名医生评分的一致性,Wilcoxon秩和检验比较两种DWI序列对图像整体质量显示的差异。2名放射科诊断医生共同对肺占位性病变进行定量参数的测量,计算肺占位性病变图像的信噪比(SNR)、对比噪声比(CNR)及病变的前后径(AP)、左右径(RL)的几何变形率(GDR),另测量肺占位性病变的表观扩散系数值(ADC),使用配对样本t检验比较两序列测得定量参数的差异。结果共收集肺占位病变的患者56例,其中肺癌23例,转移瘤33例。2名放射科医生对2种DWI序列图像整体质量评分的一致性较好(Kappa>0.75)。两序列得分之间的差异有统计学意义(P<0.001)。iShim-DWI和SS-EPI显示肺占位性病变的SNR、CNR分别为23.683、39.803和15.525、21.261,2种序列间SNR、CNR差异有统计学意义(P<0.001)。iShim-DWI和SS-EPI测量肺占位性病变前后、左右方向的GDR分别为6.914、6.879和27.827、25.859,iShim-DWI对肺占位性病变GDR较SS-EPI显著降低(P<0.001)。在iShim-DWI和SS-EPI中测量病变的ADC值分别为1.097×10^(-3)、1.105×10^(-3) mm 2·s^(-1),差异无统计学意义(P>0.05)。结论在肺占位性病变的检查中,iShim-DWI可以明显提高DWI的图像质量。展开更多
156 one-day-old broiler chicks were divided into control and treatment groups with 6 replicates for each group to determine the effects of xylanase supplementation(1‰)on performances and SS mRNA expression of broiler...156 one-day-old broiler chicks were divided into control and treatment groups with 6 replicates for each group to determine the effects of xylanase supplementation(1‰)on performances and SS mRNA expression of broilers fed with wheat basal diet.The results showed that xylanase significantly increased ADG(average daily gain) by 4.81%(P<0.01),While decreased F/G(feed/gain)by 5.00%(P<0.05).Semi-quantitative RT-PCR results showed a significant down-regulation of SS mRNA expression in duodenum(16.45%,P<0.05),but not in jejunum of treated chicken.In addition,a clear difference in the abundance of SS mRNA expression was shown between duodenum and jejunum in the control chickens.This result indicates that the expression of SS mRNA is regulated differently in different segments of small intestine in the chicken and xylanase may affect the duodenal expression SS mRNA to achieve its growth promoting effects in broiler chickens fed on wheat basal diet.展开更多
文摘随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time linear equalizer,CTLE),该均衡器采用2级级联结构来补偿信道衰减,并提高接收信号的质量。此外,自适应模块通过采用符号-符号最小均方误差(sign-sign least mean square,SS-LMS)算法,使抽头系数加快了收敛速度。仿真结果表明,当传输速率为16 Gbit/s时,均衡器可以补偿-15.53 dB的半波特率通道衰减,均衡器系数在16×10^(4)个单元间隔数据内收敛,并且收敛之后接收误码率低于10^(-12)。
文摘This study presents the ballistic limit velocity of small caliber projectiles against SS400 steel plate derived from live-fire ballistic experiments. Four different small caliber projectiles were tested against SS400 steel plates of 9 mm, 10 mm, and 12 mm thicknesses. The ballistic limit velocity was calculated using two standard methods, MIL-STD-662F and NIJ-STD-0101.06, and additionally using a support vector machine algorithm. The results show a linear relationship between the plate thickness and ballistic limit velocity. Further, the relative penetration performance among five different small caliber projectiles was analyzed using the Penetration Performance Ratio(PPR) introduced in this study, which suggests the potential of PPR to predict the ballistic limit velocity of other untested materials and/or different projectiles.
文摘目的对比逐层匀场技术(iShim-DWI)与单次激发平面回波成像(SS-EPI)应用于肺部占位性病变MR检查中成像质量的差异。方法前瞻性收集2017年9月至2023年3月经CT检查证实存在肺占位病变的患者的MR图像。所有患者均使用3.0 T MRI检查仪行SS-EPI、iShim-DWI及T 2WI扫描。以T 2WI-haste图像为参考,由2名放射科医生采用五分法对2种DWI图像整体质量评分,Kappa检验用来评价2名医生评分的一致性,Wilcoxon秩和检验比较两种DWI序列对图像整体质量显示的差异。2名放射科诊断医生共同对肺占位性病变进行定量参数的测量,计算肺占位性病变图像的信噪比(SNR)、对比噪声比(CNR)及病变的前后径(AP)、左右径(RL)的几何变形率(GDR),另测量肺占位性病变的表观扩散系数值(ADC),使用配对样本t检验比较两序列测得定量参数的差异。结果共收集肺占位病变的患者56例,其中肺癌23例,转移瘤33例。2名放射科医生对2种DWI序列图像整体质量评分的一致性较好(Kappa>0.75)。两序列得分之间的差异有统计学意义(P<0.001)。iShim-DWI和SS-EPI显示肺占位性病变的SNR、CNR分别为23.683、39.803和15.525、21.261,2种序列间SNR、CNR差异有统计学意义(P<0.001)。iShim-DWI和SS-EPI测量肺占位性病变前后、左右方向的GDR分别为6.914、6.879和27.827、25.859,iShim-DWI对肺占位性病变GDR较SS-EPI显著降低(P<0.001)。在iShim-DWI和SS-EPI中测量病变的ADC值分别为1.097×10^(-3)、1.105×10^(-3) mm 2·s^(-1),差异无统计学意义(P>0.05)。结论在肺占位性病变的检查中,iShim-DWI可以明显提高DWI的图像质量。
文摘156 one-day-old broiler chicks were divided into control and treatment groups with 6 replicates for each group to determine the effects of xylanase supplementation(1‰)on performances and SS mRNA expression of broilers fed with wheat basal diet.The results showed that xylanase significantly increased ADG(average daily gain) by 4.81%(P<0.01),While decreased F/G(feed/gain)by 5.00%(P<0.05).Semi-quantitative RT-PCR results showed a significant down-regulation of SS mRNA expression in duodenum(16.45%,P<0.05),but not in jejunum of treated chicken.In addition,a clear difference in the abundance of SS mRNA expression was shown between duodenum and jejunum in the control chickens.This result indicates that the expression of SS mRNA is regulated differently in different segments of small intestine in the chicken and xylanase may affect the duodenal expression SS mRNA to achieve its growth promoting effects in broiler chickens fed on wheat basal diet.
