分布式静止串联补偿器(distributed static series compensator,DSSC)通过调节注入线路的电压可改变线路功率,优化电网潮流分布。针对现有交流线路保护算法难以适应DSSC串入线路运行的问题,提出了抑制DSSC对线路保护影响的方法。首先,...分布式静止串联补偿器(distributed static series compensator,DSSC)通过调节注入线路的电压可改变线路功率,优化电网潮流分布。针对现有交流线路保护算法难以适应DSSC串入线路运行的问题,提出了抑制DSSC对线路保护影响的方法。首先,分析了DSSC对交流线路保护的影响,证明了DSSC注入电压可能改变距离保护的阻抗测量值,导致距离保护有拒动或误动的风险。然后,提出了利用DSSC本体过流保护快速将DSSC旁路、或基于故障辅助判据主动将DSSC注入电压降为0的方法,以抑制不同类型的线路故障时DSSC对线路保护的影响。最后,基于硬件在环RTDS实时仿真平台以及浙江湖州DSSC示范工程现场进行试验,验证了所提抑制DSSC对交流线路保护影响的方法的有效性。展开更多
有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)...有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)的方法实现对非理想电网电压条件下网侧电压的处理,得到平衡无畸变的电网电压,并对负载电流处理,得到准确的基波电流正序分量。然后对传统p-q法进行改进,得到了基于MAF-ANF的谐波检测方法,该方法较传统方法谐波检测精度提高,取得了更好的补偿效果。最后通过Simulink仿真证明了在非理想电网电压条件下所提检测算法的正确性和有效性。展开更多
Saurichthys dawaziensis sp. nov., from the third member of the Gejiu Formation （Anisian of Middle Triassic） in the vicinity of Luoping, Yunnan Province, is a small to mediumsized saurichthyid fish. It is characteriz...Saurichthys dawaziensis sp. nov., from the third member of the Gejiu Formation （Anisian of Middle Triassic） in the vicinity of Luoping, Yunnan Province, is a small to mediumsized saurichthyid fish. It is characterized by the efferent pseudobranchial arteries penetrating on the parasphenoid and the mandible sensory canal with a branch in the angular. The new species is more derived than the Lower Triassic species in having a relatively narrow postorbital region, short preopercular, single ossification of the sclerotic ring, small haemal arches between the pelvic fins and the anal fin without ossified spines, and in the absence of quadratojugal. It is more primitive than the Middle and Upper Triassic Saurichthys in having fringing fulcra and numerous segments in the unpaired fins, and the presence of both prae- and post-zygapophyses in the neural arches. Some anatomic changes related to the vertebral column and unpaired fins of the genus are also discussed.展开更多
Objective： To construct the recombinant adenovirus expressing small RNA of rats caspase-3 and observe the down-regulation effect of caspase-3 in neurons induced by lipopolysaccharide（LPS） in vitro. Methods： pShutt...Objective： To construct the recombinant adenovirus expressing small RNA of rats caspase-3 and observe the down-regulation effect of caspase-3 in neurons induced by lipopolysaccharide（LPS） in vitro. Methods： pShuttleHl-siCas3 containing Oligo DNA of the targeting sequences and pEGFPC1-Cas3 containing caspase-3 and EGFP sequences were constructed respectively, pShuttleH 1-siCas3 and pEGFPC 1-Cas3 were co-transfected to the 293 cells by liposomes to determine interfering efficacy by flow cytometry, pShuttleHl-siCas3 was linearized and transformed into E. coli B J5183 cells containing backbone plasmid pAdEasy-1. The recombinant plasmid was transfected into 293 cells to package the adenovirus Ad-siCas3. The titers of adenovirus were determined by the specific 50% tissue culture infection dosage method. After virus infected the cultured hippocampus neurons, LPS-induced apoptosis and caspase-3 mRNA expression were observed. Results： It was identified that the sequence of target gene was correctly inserted into the genome of virus. The expression of green fluorescence protein was reduced by pShuttleHl-siCas3 in 293 cells. The titer of recombinant adenovirus was 1.06×10^10pfu/ml. After virus infection, caspase-3 mRNA was greatly reduced and neurons apoptosis was suppressed. Conclusion： The recombinant adenovirus expressing rats caspase-3 siRNA were successfully constructed, which may probably be further used in pain therapy by its anti-apoptosis effect.展开更多
文摘分布式静止串联补偿器(distributed static series compensator,DSSC)通过调节注入线路的电压可改变线路功率,优化电网潮流分布。针对现有交流线路保护算法难以适应DSSC串入线路运行的问题,提出了抑制DSSC对线路保护影响的方法。首先,分析了DSSC对交流线路保护的影响,证明了DSSC注入电压可能改变距离保护的阻抗测量值,导致距离保护有拒动或误动的风险。然后,提出了利用DSSC本体过流保护快速将DSSC旁路、或基于故障辅助判据主动将DSSC注入电压降为0的方法,以抑制不同类型的线路故障时DSSC对线路保护的影响。最后,基于硬件在环RTDS实时仿真平台以及浙江湖州DSSC示范工程现场进行试验,验证了所提抑制DSSC对交流线路保护影响的方法的有效性。
文摘有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和i_p-i_q法无法准确实现对负荷综合补偿。为此文中引入基于滑动平均滤波器-自适应陷波滤波器(MAF-ANF)的方法实现对非理想电网电压条件下网侧电压的处理,得到平衡无畸变的电网电压,并对负载电流处理,得到准确的基波电流正序分量。然后对传统p-q法进行改进,得到了基于MAF-ANF的谐波检测方法,该方法较传统方法谐波检测精度提高,取得了更好的补偿效果。最后通过Simulink仿真证明了在非理想电网电压条件下所提检测算法的正确性和有效性。
基金supported by theNSFC(grants no.40572004 and 40702001)
文摘Saurichthys dawaziensis sp. nov., from the third member of the Gejiu Formation （Anisian of Middle Triassic） in the vicinity of Luoping, Yunnan Province, is a small to mediumsized saurichthyid fish. It is characterized by the efferent pseudobranchial arteries penetrating on the parasphenoid and the mandible sensory canal with a branch in the angular. The new species is more derived than the Lower Triassic species in having a relatively narrow postorbital region, short preopercular, single ossification of the sclerotic ring, small haemal arches between the pelvic fins and the anal fin without ossified spines, and in the absence of quadratojugal. It is more primitive than the Middle and Upper Triassic Saurichthys in having fringing fulcra and numerous segments in the unpaired fins, and the presence of both prae- and post-zygapophyses in the neural arches. Some anatomic changes related to the vertebral column and unpaired fins of the genus are also discussed.
文摘Objective： To construct the recombinant adenovirus expressing small RNA of rats caspase-3 and observe the down-regulation effect of caspase-3 in neurons induced by lipopolysaccharide（LPS） in vitro. Methods： pShuttleHl-siCas3 containing Oligo DNA of the targeting sequences and pEGFPC1-Cas3 containing caspase-3 and EGFP sequences were constructed respectively, pShuttleH 1-siCas3 and pEGFPC 1-Cas3 were co-transfected to the 293 cells by liposomes to determine interfering efficacy by flow cytometry, pShuttleHl-siCas3 was linearized and transformed into E. coli B J5183 cells containing backbone plasmid pAdEasy-1. The recombinant plasmid was transfected into 293 cells to package the adenovirus Ad-siCas3. The titers of adenovirus were determined by the specific 50% tissue culture infection dosage method. After virus infected the cultured hippocampus neurons, LPS-induced apoptosis and caspase-3 mRNA expression were observed. Results： It was identified that the sequence of target gene was correctly inserted into the genome of virus. The expression of green fluorescence protein was reduced by pShuttleHl-siCas3 in 293 cells. The titer of recombinant adenovirus was 1.06×10^10pfu/ml. After virus infection, caspase-3 mRNA was greatly reduced and neurons apoptosis was suppressed. Conclusion： The recombinant adenovirus expressing rats caspase-3 siRNA were successfully constructed, which may probably be further used in pain therapy by its anti-apoptosis effect.
