World famous colour TVs,such asSony,National and Toshiba,usedto monopolize China’s large-screencolour TV market.But recently the KingBrand colour TV made by the TCL ElectronicsGroup has begun to challenge them.In1995...World famous colour TVs,such asSony,National and Toshiba,usedto monopolize China’s large-screencolour TV market.But recently the KingBrand colour TV made by the TCL ElectronicsGroup has begun to challenge them.In1995,the TCL King Brand colour TV notonly ranked first for its sales volume on theChinese market among the domestically-produced TVs of its kind,but also展开更多
This paper proposes an estimation method of the directions of arrival(DOA) for the broadband signals received by a uniform planar antenna array including the mutual coupling effect. The process modeling of antenna arr...This paper proposes an estimation method of the directions of arrival(DOA) for the broadband signals received by a uniform planar antenna array including the mutual coupling effect. The process modeling of antenna array receiving dynamic signal is obtained accurately via building the array system electromagnetic space-time model, and the mutual coupling effect is included in the synthesis procedure automatically. The broadband signal is divided into several sub-bands, and the complex weight of these sub-bands frequencies is figured out using the least mean square iteration programming. In the proposed method, the mutual coupling effect is compensated at the different frequencies. The calculation results show that the method is suitable for the uniform linear and uniform circular array pattern integration, and it is commendably satisfied with the requirement of engineering design.展开更多
Cooperation between China’s largest education service provider and the creator of English proficiency tests for non-native speakers is unexpected given their difficult
1998年美国辉瑞公司研制成功抗阳痿的Viagra(正式译名:万可艾。俗称“伟哥”)成为当年的一大新闻。此药的研制成功,不仅为“痿哥”一扫心头的阴霾,而且为辉瑞公司赢得了巨大的利润。残酷的商业竞争令“一枝独秀”的商品成为短命。本文...1998年美国辉瑞公司研制成功抗阳痿的Viagra(正式译名:万可艾。俗称“伟哥”)成为当年的一大新闻。此药的研制成功,不仅为“痿哥”一扫心头的阴霾,而且为辉瑞公司赢得了巨大的利润。残酷的商业竞争令“一枝独秀”的商品成为短命。本文告诉我们,继Viagra之后。又有两种治阳痿的药物问世,它们是:美国另一家公司研制的Cialis以及德国拜耳公司研制的vardenafil。本文不仅可以让读者作语言学习之用,还让我们感受到商业竞争中的“刀光剑影”。本文的一句难句是: Krensavage predicted Viagra, with its familiar brand name and Pfizer'smarketing might behind it, will continue to enjoy growing sales even if vardenafil and Cialis are approved and become popular. 译文:Krensavage预言,由于Viagra已经打响的品牌和辉瑞公司的市场营销能力,Viagra的销售量将继续增长,即使vardenafil和Cialis获得核准并走红市场。 难点在于原句里的with+复合宾语的结构的理解: with its familiar brand name and Pfizer's marketing might behind it 句中的might用作名词,含义是“力量”,而不能理解为情态动词。展开更多
文摘World famous colour TVs,such asSony,National and Toshiba,usedto monopolize China’s large-screencolour TV market.But recently the KingBrand colour TV made by the TCL ElectronicsGroup has begun to challenge them.In1995,the TCL King Brand colour TV notonly ranked first for its sales volume on theChinese market among the domestically-produced TVs of its kind,but also
基金supported by the Chinese Natural Science Foundation (61401075)
文摘This paper proposes an estimation method of the directions of arrival(DOA) for the broadband signals received by a uniform planar antenna array including the mutual coupling effect. The process modeling of antenna array receiving dynamic signal is obtained accurately via building the array system electromagnetic space-time model, and the mutual coupling effect is included in the synthesis procedure automatically. The broadband signal is divided into several sub-bands, and the complex weight of these sub-bands frequencies is figured out using the least mean square iteration programming. In the proposed method, the mutual coupling effect is compensated at the different frequencies. The calculation results show that the method is suitable for the uniform linear and uniform circular array pattern integration, and it is commendably satisfied with the requirement of engineering design.
文摘第五代通信技术(5th-Generation,5G)为室内定位领域带来了新的可能性,超宽带(ultra wide band,UWB)定位技术与5G定位技术都具有带宽大、频率高的特性,但是定位性能却略有差异.针对单一传感器定位的准确性、稳定性差的问题,本文提出了5G+UWB的融合定位算法,构建了基于到达时间差(time difference of arrival,TDOA)的5G室内定位、基于三边定位算法的UWB室内定位以及基于融合定位算法的5G+UWB室内定位模型.首先验证了通过加权最小二乘(weighted least squares,WLS)算法得到的各单系统的初步定位结果,之后验证了结合Taylor级数展开法得到的改进后定位结果.在此基础上,进一步对通过融合算法将两个单系统定位结果进行融合后的组合定位结果进行实验验证.实验结果表明:UWB单系统定位结果呈现准确性较低、稳定性较高的特点,5G单系统定位结果呈现准确性较高、稳定性较低的特点,二者组合后可得到准确性和稳定性都相对较好的定位结果,组合系统定位精度最高可达0.22 m,最低可达0.73 m,可实现亚米级定位.
文摘Cooperation between China’s largest education service provider and the creator of English proficiency tests for non-native speakers is unexpected given their difficult
文摘1998年美国辉瑞公司研制成功抗阳痿的Viagra(正式译名:万可艾。俗称“伟哥”)成为当年的一大新闻。此药的研制成功,不仅为“痿哥”一扫心头的阴霾,而且为辉瑞公司赢得了巨大的利润。残酷的商业竞争令“一枝独秀”的商品成为短命。本文告诉我们,继Viagra之后。又有两种治阳痿的药物问世,它们是:美国另一家公司研制的Cialis以及德国拜耳公司研制的vardenafil。本文不仅可以让读者作语言学习之用,还让我们感受到商业竞争中的“刀光剑影”。本文的一句难句是: Krensavage predicted Viagra, with its familiar brand name and Pfizer'smarketing might behind it, will continue to enjoy growing sales even if vardenafil and Cialis are approved and become popular. 译文:Krensavage预言,由于Viagra已经打响的品牌和辉瑞公司的市场营销能力,Viagra的销售量将继续增长,即使vardenafil和Cialis获得核准并走红市场。 难点在于原句里的with+复合宾语的结构的理解: with its familiar brand name and Pfizer's marketing might behind it 句中的might用作名词,含义是“力量”,而不能理解为情态动词。
