Along with the growing integration of renewable energy resources,the new power systems,which are dominated by inverter-based resources(IBRs),are facing critical challenges in both planning and operation stages.The con...Along with the growing integration of renewable energy resources,the new power systems,which are dominated by inverter-based resources(IBRs),are facing critical challenges in both planning and operation stages.The conventionally used system strength metric,short-circuit ratio(SCR),exhibits limitations in assessing connections of new IBRs due to their unique dynamic behaviour and control interactions.In this paper,the definition of system strength is reviewed.The underlying principles of conventional SCR and its variants are then discussed,with their constraints explained.To describe the system strength in a more comprehensive way,this paper further classifies system strength into three categories:quasi-static,small-signal,and large-signal.For each category,relevant metrics are introduced and their relative merits are discussed.Electromagnetic transient simulations are presented to illustrate key insights.展开更多
IBRS-2细胞出现分化变异影响使用,为不影响正常的科学研究,本研究采用单细胞克隆的方法重新提纯,用96孔板经过3周的独立培养后,将具有代表性的4株进行扩增,然后用已知毒价的口蹄疫病毒(foot and mouth disease virus,FM-DV)弱毒分别对...IBRS-2细胞出现分化变异影响使用,为不影响正常的科学研究,本研究采用单细胞克隆的方法重新提纯,用96孔板经过3周的独立培养后,将具有代表性的4株进行扩增,然后用已知毒价的口蹄疫病毒(foot and mouth disease virus,FM-DV)弱毒分别对其进行接毒试验和TCID50测定。结果表明,B1株克隆细胞的病变最为理想,其TCID50为7.60,比提纯前的4.52更接近实际毒价7.85,且和实际毒价无显著差异。展开更多
牛传染性鼻气管炎(IBR)是牛的一种严重传染病,遍及世界各地,我国大部分地区有此病流行,其病原是一种α疱疹病毒.该病毒在自然界存在许多毒株,其差异可以通过 DNA 酶切图谱、多肽图谱及单克隆抗体加以区分.IBR 病毒 DNA 被两个反向重复...牛传染性鼻气管炎(IBR)是牛的一种严重传染病,遍及世界各地,我国大部分地区有此病流行,其病原是一种α疱疹病毒.该病毒在自然界存在许多毒株,其差异可以通过 DNA 酶切图谱、多肽图谱及单克隆抗体加以区分.IBR 病毒 DNA 被两个反向重复序列分割成一长的单一序列(LS)和一短的单一序列(SS),两个重复序列及夹在中间的 SS 序列可以沿轴旋转180度,使病毒 DNA 分子具有两种异构体.SS 区与病毒的致病性及免疫原性均有关系,因此,这一区域的变异将对病毒的弱化及疫苗株的培育具有重要意义.本试验将在 MDBK(牛肾)细胞上繁殖的 IBR 病毒 LA 株接种到猫肾传代细胞上连续传7代后,直接从感染的细胞中按 Pignatti 等的方法抽提病毒 DNA,用限制性内切酶展开更多
文摘Along with the growing integration of renewable energy resources,the new power systems,which are dominated by inverter-based resources(IBRs),are facing critical challenges in both planning and operation stages.The conventionally used system strength metric,short-circuit ratio(SCR),exhibits limitations in assessing connections of new IBRs due to their unique dynamic behaviour and control interactions.In this paper,the definition of system strength is reviewed.The underlying principles of conventional SCR and its variants are then discussed,with their constraints explained.To describe the system strength in a more comprehensive way,this paper further classifies system strength into three categories:quasi-static,small-signal,and large-signal.For each category,relevant metrics are introduced and their relative merits are discussed.Electromagnetic transient simulations are presented to illustrate key insights.
文摘IBRS-2细胞出现分化变异影响使用,为不影响正常的科学研究,本研究采用单细胞克隆的方法重新提纯,用96孔板经过3周的独立培养后,将具有代表性的4株进行扩增,然后用已知毒价的口蹄疫病毒(foot and mouth disease virus,FM-DV)弱毒分别对其进行接毒试验和TCID50测定。结果表明,B1株克隆细胞的病变最为理想,其TCID50为7.60,比提纯前的4.52更接近实际毒价7.85,且和实际毒价无显著差异。
文摘牛传染性鼻气管炎(IBR)是牛的一种严重传染病,遍及世界各地,我国大部分地区有此病流行,其病原是一种α疱疹病毒.该病毒在自然界存在许多毒株,其差异可以通过 DNA 酶切图谱、多肽图谱及单克隆抗体加以区分.IBR 病毒 DNA 被两个反向重复序列分割成一长的单一序列(LS)和一短的单一序列(SS),两个重复序列及夹在中间的 SS 序列可以沿轴旋转180度,使病毒 DNA 分子具有两种异构体.SS 区与病毒的致病性及免疫原性均有关系,因此,这一区域的变异将对病毒的弱化及疫苗株的培育具有重要意义.本试验将在 MDBK(牛肾)细胞上繁殖的 IBR 病毒 LA 株接种到猫肾传代细胞上连续传7代后,直接从感染的细胞中按 Pignatti 等的方法抽提病毒 DNA,用限制性内切酶
