DAYU3D is a modern three-dimensional(3D)computer code for thermal-hydraulic design and accident analysis in hightemperature gas-cooled reactors(HTGRs),developed by the Institute of Nuclear and New Energy Technology(IN...DAYU3D is a modern three-dimensional(3D)computer code for thermal-hydraulic design and accident analysis in hightemperature gas-cooled reactors(HTGRs),developed by the Institute of Nuclear and New Energy Technology(INET)at Tsinghua University.Compared to the traditional codes like TINTE,the DAYU3D code has advantages due to its refined framework,improved models,and more efficient algorithms.It is able to simulate the continuous movement of control rods and is more rigorous in treating radiation heat transfer and the break mass flow.Advanced computational methods significantly improve the computational efficiency of DAYU3D,achieving a time reduction of over 60%compared to TINTE.Extensive verification and validation with more than 100 cases demonstrate that DAYU3D is promising for HTGR 3D thermal-hydraulic design and accident analyses.展开更多
目的探讨星状神经节阻滞(SGB)通过长链非编码RNA(lncRNA)牛磺酸上调基因1(TUG1)-NOD样受体热蛋白结构域相关蛋白3(NLRP3)轴在体外脑缺血再灌注模型中对炎症反应和自噬溶酶体形成的调节作用。方法培养大鼠海马神经元细胞系H19-7,并将细...目的探讨星状神经节阻滞(SGB)通过长链非编码RNA(lncRNA)牛磺酸上调基因1(TUG1)-NOD样受体热蛋白结构域相关蛋白3(NLRP3)轴在体外脑缺血再灌注模型中对炎症反应和自噬溶酶体形成的调节作用。方法培养大鼠海马神经元细胞系H19-7,并将细胞分为8组:(i)正常对照组:正常培养的神经元细胞;(ii)氧-糖剥夺/复氧(OGD/R)组:采用氧-糖剥夺/复氧法模拟脑缺血再灌注损伤;(iii)OGD/R+SGB组:OGD/R联合麻醉药0.5%布比卡因用于体外模拟SGB;(iv)OGD/R+SGB+TUG1过表达阴性对照组:OGD/R联合布比卡因并联合TUG1过表达阴性对照质粒转染细胞;(v)OGD/R+SGB+TUG1过表达组:OGD/R联合布比卡因并联合TUG1过表达质粒转染细胞;(vi)OGD/R+SGB+TUG1过表达+MCC950组:OGD/R联合布比卡因、TUG1过表达质粒转染及NLRP3抑制剂MCC950处理细胞;(vii)OGD/R+TUG1过表达组:OGD/R联合TUG1过表达质粒转染细胞;(viii)OGD/R+MCC950组:OGD/R联合NLRP3抑制剂MCC950处理细胞。进一步通过实时定量PCR(Quantitative Real Time PCR,qRTPCR)实验检测细胞中lncRNATUG1的表达;利用Western blot法检测细胞中NLRP3、微管相关蛋白1轻链3(LC3)-I、LC3-II、自噬相关基因5(Atg5)、苄氯素1(beclin1)、自噬接头蛋白(p62)、溶酶体相关膜蛋白1(LAMP1)的表达水平;利用透射电镜(TEM)检测自噬溶酶体的数量;并用酶联免疫吸附测定(ELISA)法检测细胞培养上清中白细胞介素(IL)-1β、IL-6、IL-18、肿瘤坏死因子(TNF)-α的含量。结果与正常对照组相比,OGD/R组lncRNA TUG1、NLRP3、Atg5、beclin1、p62、LAMP1的表达水平以及LC3-II/I比值均显著上调(^(均)P<0.05),自噬溶酶体数量增加(P<0.05),IL-1β、IL-6、IL-18、TNF-α的含量显著升高(^(均)P<0.05)。与OGD/R组相比,OGD/R+SGB组的上述指标均显著下调(P<0.05)。与OGD/R+SGB+TUG1过表达阴性对照组相比,OGD/R+SGB+TUG1过表达组的lncRNA TUG1、NLRP3、Atg5、beclin1、p62、LAMP1的表达水平以及LC3-II/I比值均显著上调(^(均)P<0.05),自噬溶酶体数量增加(P<0.05),IL-1β、IL-6、IL-18、TNF-α的含量显著升高(^(均)P<0.05),然而,加入NLRP3的抑制剂MCC950后,除lncRNA TUG1外其余指标均显著下调(^(均)P<0.05)。另外,与OGD/R组比,OGD/R+TUG1过表达组的上述指标进一步上调(^(均)P<0.05)。与OGD/R组比,OGD/R+MCC950组则抑制了除lncRNA TUG1外的其余指标(^(均)P<0.05)。结论星状神经节阻滞通过调节lncRNA TUG1-NLRP3轴有效减轻体外脑缺血再灌注损伤引起的炎症反应和自噬溶酶体形成,提示其可能作为治疗缺血性脑损伤的潜在策略。展开更多
The 3GPP multimedia broadcast/multicast services(MBMS) standard takes Raptor codes as a way of channel coding and puts forward an efcient enhanced Gaussian elimination(EGE) for the Raptor decoder. However, the standar...The 3GPP multimedia broadcast/multicast services(MBMS) standard takes Raptor codes as a way of channel coding and puts forward an efcient enhanced Gaussian elimination(EGE) for the Raptor decoder. However, the standard decoding method is not the most efcient. A few of researchers made some changes based on the standard decoding method and achieved considerable performance. In this paper, a synthetic decoding method is presented according to the existing enhanced decoding method and the simulation shows that the syn- thetic way outperforms any other ways.展开更多
The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and ...The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and transportation in a superfluid^(4)He(SFHe,He-Ⅱ)source accurately.This limitation arose from the absence of an^(4)He upscattering mechanism and the absorption of^(3)He.And the provided source energy distribution in MCUCN is different from that in SFHe source.This study introduced enhancements to MCUCN to address these constraints,explicitly incorporating the^(4)He upscattering effect,the absorption of^(3)He,the loss caused by impurities on converter wall,UCN source energy distribution in SFHe,and the transmission through negative optical potential.Additionally,a Python-based visualization code for intermediate states and results was developed.To validate these enhancements,we systematically compared the simulation results of the Lujan Center Mark3 UCN system by MCUCN and the improved MCUCN code(iMCUCN)with UCNtransport simulations.Additionally,we compared the results of the SUN1 system simulated by MCUCN and iMCUCN with measurement results.The study demonstrates that iMCUCN effectively simulates the storage and transportation of ultracold neutrons in He-Ⅱ.展开更多
深度视频编码中最优深度划分和模式选择过程具有非常高的计算复杂度。提出了基于多类支持向量机(MSVM,multi-class support vector machine)的深度视频帧内编码快速算法。该算法包括离线模型训练和快速编码2个部分。在离线模型训练中,...深度视频编码中最优深度划分和模式选择过程具有非常高的计算复杂度。提出了基于多类支持向量机(MSVM,multi-class support vector machine)的深度视频帧内编码快速算法。该算法包括离线模型训练和快速编码2个部分。在离线模型训练中,用深度视频最大编码单元(LCU,largest coding unit)的最优划分深度作为标签,当前LCU的空域复杂度、空域相邻LCU的最优划分深度和彩色视频对应LCU的最优划分深度作为特征去构造MSVM模型。在编码时,提取LCU的特征,根据MSVM模型得到划分深度的预测值。根据该预测值提前终止编码单元递归划分和模式选择过程。实验结果表明,提出的算法在几乎不影响虚拟视点质量的情况下,平均节省35.91%的总体编码时间和40.04%的深度编码时间。展开更多
三维高效视频编码(three-dimensional high efficiency video coding,3D-HEVC)是立体视频编码扩展的国际标准化组织(Joint Collaborative Team on 3D Video Coding Extension Development,JCT-3V)推出的目前最新的3D视频编码标准,基于3D...三维高效视频编码(three-dimensional high efficiency video coding,3D-HEVC)是立体视频编码扩展的国际标准化组织(Joint Collaborative Team on 3D Video Coding Extension Development,JCT-3V)推出的目前最新的3D视频编码标准,基于3D-HEVC的三维视频编码技术的研究推动了其应用并成为目前三维视频编码技术的研究热点.在回顾3D视频编码标准发展基础上,描述了基于3D-HEVC的三维视频编码方案,对其中最为关键的三维视频纹理图与深度图编码方法与研究进展进行了重点分析与阐述.首先,对目前借助视频序列中纹理特性的三维视频纹理图编码方法展开了综述并说明其存在的问题.然后,对基于纹理特性和区域的三维视频深度图编码方法展开了分析和论述.最后,结合近年来最新的研究成果,展望了三维视频编码技术的发展并提出了新的研究课题.展开更多
文摘DAYU3D is a modern three-dimensional(3D)computer code for thermal-hydraulic design and accident analysis in hightemperature gas-cooled reactors(HTGRs),developed by the Institute of Nuclear and New Energy Technology(INET)at Tsinghua University.Compared to the traditional codes like TINTE,the DAYU3D code has advantages due to its refined framework,improved models,and more efficient algorithms.It is able to simulate the continuous movement of control rods and is more rigorous in treating radiation heat transfer and the break mass flow.Advanced computational methods significantly improve the computational efficiency of DAYU3D,achieving a time reduction of over 60%compared to TINTE.Extensive verification and validation with more than 100 cases demonstrate that DAYU3D is promising for HTGR 3D thermal-hydraulic design and accident analyses.
文摘目的探讨星状神经节阻滞(SGB)通过长链非编码RNA(lncRNA)牛磺酸上调基因1(TUG1)-NOD样受体热蛋白结构域相关蛋白3(NLRP3)轴在体外脑缺血再灌注模型中对炎症反应和自噬溶酶体形成的调节作用。方法培养大鼠海马神经元细胞系H19-7,并将细胞分为8组:(i)正常对照组:正常培养的神经元细胞;(ii)氧-糖剥夺/复氧(OGD/R)组:采用氧-糖剥夺/复氧法模拟脑缺血再灌注损伤;(iii)OGD/R+SGB组:OGD/R联合麻醉药0.5%布比卡因用于体外模拟SGB;(iv)OGD/R+SGB+TUG1过表达阴性对照组:OGD/R联合布比卡因并联合TUG1过表达阴性对照质粒转染细胞;(v)OGD/R+SGB+TUG1过表达组:OGD/R联合布比卡因并联合TUG1过表达质粒转染细胞;(vi)OGD/R+SGB+TUG1过表达+MCC950组:OGD/R联合布比卡因、TUG1过表达质粒转染及NLRP3抑制剂MCC950处理细胞;(vii)OGD/R+TUG1过表达组:OGD/R联合TUG1过表达质粒转染细胞;(viii)OGD/R+MCC950组:OGD/R联合NLRP3抑制剂MCC950处理细胞。进一步通过实时定量PCR(Quantitative Real Time PCR,qRTPCR)实验检测细胞中lncRNATUG1的表达;利用Western blot法检测细胞中NLRP3、微管相关蛋白1轻链3(LC3)-I、LC3-II、自噬相关基因5(Atg5)、苄氯素1(beclin1)、自噬接头蛋白(p62)、溶酶体相关膜蛋白1(LAMP1)的表达水平;利用透射电镜(TEM)检测自噬溶酶体的数量;并用酶联免疫吸附测定(ELISA)法检测细胞培养上清中白细胞介素(IL)-1β、IL-6、IL-18、肿瘤坏死因子(TNF)-α的含量。结果与正常对照组相比,OGD/R组lncRNA TUG1、NLRP3、Atg5、beclin1、p62、LAMP1的表达水平以及LC3-II/I比值均显著上调(^(均)P<0.05),自噬溶酶体数量增加(P<0.05),IL-1β、IL-6、IL-18、TNF-α的含量显著升高(^(均)P<0.05)。与OGD/R组相比,OGD/R+SGB组的上述指标均显著下调(P<0.05)。与OGD/R+SGB+TUG1过表达阴性对照组相比,OGD/R+SGB+TUG1过表达组的lncRNA TUG1、NLRP3、Atg5、beclin1、p62、LAMP1的表达水平以及LC3-II/I比值均显著上调(^(均)P<0.05),自噬溶酶体数量增加(P<0.05),IL-1β、IL-6、IL-18、TNF-α的含量显著升高(^(均)P<0.05),然而,加入NLRP3的抑制剂MCC950后,除lncRNA TUG1外其余指标均显著下调(^(均)P<0.05)。另外,与OGD/R组比,OGD/R+TUG1过表达组的上述指标进一步上调(^(均)P<0.05)。与OGD/R组比,OGD/R+MCC950组则抑制了除lncRNA TUG1外的其余指标(^(均)P<0.05)。结论星状神经节阻滞通过调节lncRNA TUG1-NLRP3轴有效减轻体外脑缺血再灌注损伤引起的炎症反应和自噬溶酶体形成,提示其可能作为治疗缺血性脑损伤的潜在策略。
文摘The 3GPP multimedia broadcast/multicast services(MBMS) standard takes Raptor codes as a way of channel coding and puts forward an efcient enhanced Gaussian elimination(EGE) for the Raptor decoder. However, the standard decoding method is not the most efcient. A few of researchers made some changes based on the standard decoding method and achieved considerable performance. In this paper, a synthetic decoding method is presented according to the existing enhanced decoding method and the simulation shows that the syn- thetic way outperforms any other ways.
基金the National Key R&D Program of China(No.2024YFE0110001)the National Natural Science Foundation of China(U1932219)the Mobility Programme endorsed by the Joint Committee of the Sino-German Center(M0728)。
文摘The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and transportation in a superfluid^(4)He(SFHe,He-Ⅱ)source accurately.This limitation arose from the absence of an^(4)He upscattering mechanism and the absorption of^(3)He.And the provided source energy distribution in MCUCN is different from that in SFHe source.This study introduced enhancements to MCUCN to address these constraints,explicitly incorporating the^(4)He upscattering effect,the absorption of^(3)He,the loss caused by impurities on converter wall,UCN source energy distribution in SFHe,and the transmission through negative optical potential.Additionally,a Python-based visualization code for intermediate states and results was developed.To validate these enhancements,we systematically compared the simulation results of the Lujan Center Mark3 UCN system by MCUCN and the improved MCUCN code(iMCUCN)with UCNtransport simulations.Additionally,we compared the results of the SUN1 system simulated by MCUCN and iMCUCN with measurement results.The study demonstrates that iMCUCN effectively simulates the storage and transportation of ultracold neutrons in He-Ⅱ.
文摘三维高效视频编码(three-dimensional high efficiency video coding,3D-HEVC)是立体视频编码扩展的国际标准化组织(Joint Collaborative Team on 3D Video Coding Extension Development,JCT-3V)推出的目前最新的3D视频编码标准,基于3D-HEVC的三维视频编码技术的研究推动了其应用并成为目前三维视频编码技术的研究热点.在回顾3D视频编码标准发展基础上,描述了基于3D-HEVC的三维视频编码方案,对其中最为关键的三维视频纹理图与深度图编码方法与研究进展进行了重点分析与阐述.首先,对目前借助视频序列中纹理特性的三维视频纹理图编码方法展开了综述并说明其存在的问题.然后,对基于纹理特性和区域的三维视频深度图编码方法展开了分析和论述.最后,结合近年来最新的研究成果,展望了三维视频编码技术的发展并提出了新的研究课题.
