随着新型电力系统建设持续推进,直流微电网将成为配电网的重要组成部分。直流微电网接入交流负载时,振荡型功率会进入直流系统,影响分布式储能系统功率分配。为此,给出了储能系统功率分配综合原则,并以此提出一种无互联通信网络的功率...随着新型电力系统建设持续推进,直流微电网将成为配电网的重要组成部分。直流微电网接入交流负载时,振荡型功率会进入直流系统,影响分布式储能系统功率分配。为此,给出了储能系统功率分配综合原则,并以此提出一种无互联通信网络的功率分配方法。该方法以荷电状态作为“信息载体”,各储能单元仅需本地荷电状态(state of charge,SOC)信息即可完成自适应调整,在实现SOC均衡控制的同时,还能够让振荡型功率合理分配。此外,从等效输出阻抗的角度出发,对不同控制算法的分配效果展开了详细的分析讨论,表明了所提控制算法可以满足综合原则的要求。最后,通过实验验证了所提分布式储能控制策略的有效性。展开更多
Objective To investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. Methods Orchiectomized and ovariectomized rat models are used to investigate sex hormone deficiency related ost...Objective To investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. Methods Orchiectomized and ovariectomized rat models are used to investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. A rat vertebral body can be longitudinally divided into central portion, which contain more trabecular bone, and para-endplate portions which contain more compact bone. In matured male and female Wistar and Sprague-Dawley rat lumbar spines, we investigated baseline bone mineral density （BMD） characteristics and the differential segmental responses in bone loss within the lumbar vertebral body post gonadal surgery with clinical multidetector computed tomography. Results Para-endplate sections had a higher BMD than central sections. The cephalad para-endplate sections had a higher BMD than the caudad para-endplate sections. Eight weeks after gonadal removal, there was more bone loss in central sections than para-endplate sections. The relative difference of bone loss between para-endplate and central sections was more apparent in male rats than in female rats. There was more bone loss in caudad sections than cephalad sections; this lead to a further increase of BMD difference between caudad para-endplate sections and cephalad para-endplate sections post gonadal surgery. Conclusion The approach described in this study provided a consistent way to study BMD change within predominantly compact bone portion and trabecular bone portion of the vertebral body.展开更多
[Objective] The research aimed to clarify the genetic mechanism of special wide compatibility of GC13.[Method] The clustering analyses of GC13,five indica,five japonica and five wide compatibility varieties were carri...[Objective] The research aimed to clarify the genetic mechanism of special wide compatibility of GC13.[Method] The clustering analyses of GC13,five indica,five japonica and five wide compatibility varieties were carried out by using 70 SSR primers.[Result] GC13 was clustered into japonica group and had far genetic relationship with indica and wide compatibility variety.Two fertility loci were detected in GC13,in which one closely linked to RM225 on chromosome 6.According to the position on the chromosome,it speculated that this locus was allelic to S5.GC13 carried the allelic gene S5-n at this locus.The other locus closely linked to RM408 on chromosome 8 and was provisionally designated as Sg(t).At this locus,GC13 carried Sg(t)-i allelic gene,which was consistent with IR36.The effect of S5 locus was stronger than that of Sg(t).[Conclusion] The research laid the good foundation for using the wide compatibility line GC13 to breed the hybrid between subspecies.展开更多
Intense wide-band photoluminescence(PL)with high stability to ultraviolet(UV)light irradiation has been observed in a wide temperature range from a polycrystalline SiC sintered from graphite and melt Si at high temper...Intense wide-band photoluminescence(PL)with high stability to ultraviolet(UV)light irradiation has been observed in a wide temperature range from a polycrystalline SiC sintered from graphite and melt Si at high temperature over 1500°C.X-ray diffraction results showed that the sintered material consists of mainly cubic and 6H-SiC crystallites oriented randomly and a smallamount of graphite with(002)preferential orientation.PLspectra of the samples were measured under excitation of the incident UV light beam from an He-Cd laser(325 nm,l0mW)in the temperature range from 10 to 300 K.The PL spectra were found to be a single wide-band centered around 2.2 eV at room temperature and to be divided into a much more intensive blue band and a lessintensive red band at low temperature.The low temperature PL bands consist of several luminescence peaks that change in intensities relatively with variation of temperature.展开更多
文摘随着新型电力系统建设持续推进,直流微电网将成为配电网的重要组成部分。直流微电网接入交流负载时,振荡型功率会进入直流系统,影响分布式储能系统功率分配。为此,给出了储能系统功率分配综合原则,并以此提出一种无互联通信网络的功率分配方法。该方法以荷电状态作为“信息载体”,各储能单元仅需本地荷电状态(state of charge,SOC)信息即可完成自适应调整,在实现SOC均衡控制的同时,还能够让振荡型功率合理分配。此外,从等效输出阻抗的角度出发,对不同控制算法的分配效果展开了详细的分析讨论,表明了所提控制算法可以满足综合原则的要求。最后,通过实验验证了所提分布式储能控制策略的有效性。
基金Supported by GRF of Hong Kong SAR (project no. 464508)a direct grant for research from the Chinese University of Hong Kong (project no.2041501)
文摘Objective To investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. Methods Orchiectomized and ovariectomized rat models are used to investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. A rat vertebral body can be longitudinally divided into central portion, which contain more trabecular bone, and para-endplate portions which contain more compact bone. In matured male and female Wistar and Sprague-Dawley rat lumbar spines, we investigated baseline bone mineral density （BMD） characteristics and the differential segmental responses in bone loss within the lumbar vertebral body post gonadal surgery with clinical multidetector computed tomography. Results Para-endplate sections had a higher BMD than central sections. The cephalad para-endplate sections had a higher BMD than the caudad para-endplate sections. Eight weeks after gonadal removal, there was more bone loss in central sections than para-endplate sections. The relative difference of bone loss between para-endplate and central sections was more apparent in male rats than in female rats. There was more bone loss in caudad sections than cephalad sections; this lead to a further increase of BMD difference between caudad para-endplate sections and cephalad para-endplate sections post gonadal surgery. Conclusion The approach described in this study provided a consistent way to study BMD change within predominantly compact bone portion and trabecular bone portion of the vertebral body.
基金Supported by Guangxi Natural Science Fund Item(2010GXNSFD013035)Guangxi Science Fund Item(Guikeqing0832063)+1 种基金Guangxi Science Research and Technology Development Planning Item(Guikegong1123001-3C)National Science and Technology Support Planning Item(2007BAD68B01)
文摘[Objective] The research aimed to clarify the genetic mechanism of special wide compatibility of GC13.[Method] The clustering analyses of GC13,five indica,five japonica and five wide compatibility varieties were carried out by using 70 SSR primers.[Result] GC13 was clustered into japonica group and had far genetic relationship with indica and wide compatibility variety.Two fertility loci were detected in GC13,in which one closely linked to RM225 on chromosome 6.According to the position on the chromosome,it speculated that this locus was allelic to S5.GC13 carried the allelic gene S5-n at this locus.The other locus closely linked to RM408 on chromosome 8 and was provisionally designated as Sg(t).At this locus,GC13 carried Sg(t)-i allelic gene,which was consistent with IR36.The effect of S5 locus was stronger than that of Sg(t).[Conclusion] The research laid the good foundation for using the wide compatibility line GC13 to breed the hybrid between subspecies.
基金Supported by the National Natural Science Foundation of China under Grant No.69876030.
文摘Intense wide-band photoluminescence(PL)with high stability to ultraviolet(UV)light irradiation has been observed in a wide temperature range from a polycrystalline SiC sintered from graphite and melt Si at high temperature over 1500°C.X-ray diffraction results showed that the sintered material consists of mainly cubic and 6H-SiC crystallites oriented randomly and a smallamount of graphite with(002)preferential orientation.PLspectra of the samples were measured under excitation of the incident UV light beam from an He-Cd laser(325 nm,l0mW)in the temperature range from 10 to 300 K.The PL spectra were found to be a single wide-band centered around 2.2 eV at room temperature and to be divided into a much more intensive blue band and a lessintensive red band at low temperature.The low temperature PL bands consist of several luminescence peaks that change in intensities relatively with variation of temperature.
