在考核电力/电子设备抗强电磁脉冲性能的千安培(kA)级脉冲电流注入试验中,注入环通过感性耦合的方式将脉冲源输出能量加载到受试设备端口,是注入试验平台的重要组成部分.为解决kA级电流注入环的时域电路仿真难题,本文以Montena IC3B型...在考核电力/电子设备抗强电磁脉冲性能的千安培(kA)级脉冲电流注入试验中,注入环通过感性耦合的方式将脉冲源输出能量加载到受试设备端口,是注入试验平台的重要组成部分.为解决kA级电流注入环的时域电路仿真难题,本文以Montena IC3B型注入环为例,采用多段集总参数电路串联的方法,建立了考虑分布参数因素的kA级注入环SPICE(Simulation Program with Integrated Circuit Emphasis,SPICE)电路模型;并依据注入环磁芯材料特性,对端口阻抗测试数据进行了分频段拟合,采用粒子群优化算法求取了电路模型参数;最后将该模型应用于kA级脉冲电流注入平台的整体电路仿真,并进行了实验验证,结果表明该模型具有较高的时域仿真精度,可用于电力/电子设备强电磁脉冲电流注入试验的设计、分析、效果预估等工作.展开更多
保证光伏电池始终输出最大功率的前提是准确定位光伏电池最大功率点,为此研究基于仿真电路模拟器(simulation program with integrated circuit emphasis,SPICE)模型与互信息的光伏电池最大功率点定位算法。通过基于SPICE模型的光伏电...保证光伏电池始终输出最大功率的前提是准确定位光伏电池最大功率点,为此研究基于仿真电路模拟器(simulation program with integrated circuit emphasis,SPICE)模型与互信息的光伏电池最大功率点定位算法。通过基于SPICE模型的光伏电池建模方法,将光伏电池电路网表、最大功率点电压、最大功率点电流、开路电压、短路电流数据输入SPICE模型,构建光伏电池模型,仿真拟合光伏电池运行状态;由基于最大互信息的最大功率点定位算法,将最大互信息值设成最大功率点定位的测度指标,使用改进新型狮群算法,检索光伏电池模型电路中满足最大互信息值约束条件的最大功率点。研究表明,此算法可利用SPICE模型准确仿真分析电池运行状态;最大功率点定位时,定位偏差最大值仅有0.1 W;在光伏电池功率调控任务中,此算法辅助定位后,光伏电池功率调控振荡较小,说明定位精度可满足使用需求。展开更多
Spices and aromatic plants are products of plant origin used in food. They are used for the preparation of remedies, for seasoning dishes or for preserving food. This review takes stock of the diversity of spices and ...Spices and aromatic plants are products of plant origin used in food. They are used for the preparation of remedies, for seasoning dishes or for preserving food. This review takes stock of the diversity of spices and aromatic herbs, the chemical composition, the different properties and forms of use of six spices and aromatic herbs commonly used in Benin and around the world. These are Zingiber officinalis (ginger), Curcuma longa (curcuma), Syzygium aromaticum (clove) and three aromatic herbs Petroselinum crispum (parsley), Rosmarinus officinalis (rosemary), and Laurus nobilis (laurel). The methodology used is that of documentary research oriented towards the consultation of previous scientific documents that have highlighted the different pharmacological activities of the different species of spices and aromatic plants targeted. It is important to note that more than twenty plant species are used as spices and aromatic plants in Benin and around the world. Chemically, these different spices and aromatic herbs contain certain secondary metabolites such as flavonoids, tannins, coumarins, alkaloids, steroids, terpenes, saponins, and polyphenols. This diversity of secondary metabolites alone or in a possible synergy may be responsible for many beneficial properties attributed to spices and aromatic herbs.展开更多
Frankincense is also called“Fumigated land,”“Horsetail spice,”and“Godsend spice.”The alias“Fumigated land”shows its strong fragrance that can cover the whole land.The name of“Horsetail spice”implies its morp...Frankincense is also called“Fumigated land,”“Horsetail spice,”and“Godsend spice.”The alias“Fumigated land”shows its strong fragrance that can cover the whole land.The name of“Horsetail spice”implies its morphologic characteristics and mild effects,and another name of“Godsend spice”indicates its functions of relieving swelling and pain,healing sore,and growing muscle,as if it is the grace donated by God.The name of“Frankincense”displays its complex productive progress.With thick quality and strong fragrance,frankincense acts as daily supplies for religious activities and folk activities due to its low price and a wide range of uses in medicine and daily life.Frankincense shows the infinite charm of spice culture along the Silk Road from the distant Western Regions to the East.At the same time,it enriches the treasure house of traditional Chinese medicine and becomes one of the most popular spices in both eastern and western,nobility and common.展开更多
文摘在考核电力/电子设备抗强电磁脉冲性能的千安培(kA)级脉冲电流注入试验中,注入环通过感性耦合的方式将脉冲源输出能量加载到受试设备端口,是注入试验平台的重要组成部分.为解决kA级电流注入环的时域电路仿真难题,本文以Montena IC3B型注入环为例,采用多段集总参数电路串联的方法,建立了考虑分布参数因素的kA级注入环SPICE(Simulation Program with Integrated Circuit Emphasis,SPICE)电路模型;并依据注入环磁芯材料特性,对端口阻抗测试数据进行了分频段拟合,采用粒子群优化算法求取了电路模型参数;最后将该模型应用于kA级脉冲电流注入平台的整体电路仿真,并进行了实验验证,结果表明该模型具有较高的时域仿真精度,可用于电力/电子设备强电磁脉冲电流注入试验的设计、分析、效果预估等工作.
文摘保证光伏电池始终输出最大功率的前提是准确定位光伏电池最大功率点,为此研究基于仿真电路模拟器(simulation program with integrated circuit emphasis,SPICE)模型与互信息的光伏电池最大功率点定位算法。通过基于SPICE模型的光伏电池建模方法,将光伏电池电路网表、最大功率点电压、最大功率点电流、开路电压、短路电流数据输入SPICE模型,构建光伏电池模型,仿真拟合光伏电池运行状态;由基于最大互信息的最大功率点定位算法,将最大互信息值设成最大功率点定位的测度指标,使用改进新型狮群算法,检索光伏电池模型电路中满足最大互信息值约束条件的最大功率点。研究表明,此算法可利用SPICE模型准确仿真分析电池运行状态;最大功率点定位时,定位偏差最大值仅有0.1 W;在光伏电池功率调控任务中,此算法辅助定位后,光伏电池功率调控振荡较小,说明定位精度可满足使用需求。
文摘Spices and aromatic plants are products of plant origin used in food. They are used for the preparation of remedies, for seasoning dishes or for preserving food. This review takes stock of the diversity of spices and aromatic herbs, the chemical composition, the different properties and forms of use of six spices and aromatic herbs commonly used in Benin and around the world. These are Zingiber officinalis (ginger), Curcuma longa (curcuma), Syzygium aromaticum (clove) and three aromatic herbs Petroselinum crispum (parsley), Rosmarinus officinalis (rosemary), and Laurus nobilis (laurel). The methodology used is that of documentary research oriented towards the consultation of previous scientific documents that have highlighted the different pharmacological activities of the different species of spices and aromatic plants targeted. It is important to note that more than twenty plant species are used as spices and aromatic plants in Benin and around the world. Chemically, these different spices and aromatic herbs contain certain secondary metabolites such as flavonoids, tannins, coumarins, alkaloids, steroids, terpenes, saponins, and polyphenols. This diversity of secondary metabolites alone or in a possible synergy may be responsible for many beneficial properties attributed to spices and aromatic herbs.
文摘Frankincense is also called“Fumigated land,”“Horsetail spice,”and“Godsend spice.”The alias“Fumigated land”shows its strong fragrance that can cover the whole land.The name of“Horsetail spice”implies its morphologic characteristics and mild effects,and another name of“Godsend spice”indicates its functions of relieving swelling and pain,healing sore,and growing muscle,as if it is the grace donated by God.The name of“Frankincense”displays its complex productive progress.With thick quality and strong fragrance,frankincense acts as daily supplies for religious activities and folk activities due to its low price and a wide range of uses in medicine and daily life.Frankincense shows the infinite charm of spice culture along the Silk Road from the distant Western Regions to the East.At the same time,it enriches the treasure house of traditional Chinese medicine and becomes one of the most popular spices in both eastern and western,nobility and common.
