Field experiments were carried out to study the effect of different foliar fertilizer treatments on the agronomic traits,yield,and quality of Brassica napus L.for both vegetable and oil dual-use rape.The seedlings of...Field experiments were carried out to study the effect of different foliar fertilizer treatments on the agronomic traits,yield,and quality of Brassica napus L.for both vegetable and oil dual-use rape.The seedlings of‘Youtai 929’,‘Jinyoutai 1’,and‘Zhongshuang 11’were sprayed with potassium dihydrogen phosphate,naphthylacetic acid,and selenium fertilizer,and the agronomic traits,yield,and quality were determined.The results showed that the naphthylacetic acid treatment had the highest indexes before winter,followed by the selenium fertilizer treatment.At the harvesting stage,the plant height,number of siliquae,yield per plant,and number of effective branches on the main stem of the three varieties were the highest in the naphthylacetic acid treatment,followed by those in the potassium dihydrogen phosphate treatment.The fresh shoot quality was the best in the selenium fertilizer treatment and the second in the naphthylacetic acid treatment.‘Jinyoutai 1’applied with naphthylacetic acid had the highest economic benefit of 4971.78 CNY/667m^(2),which was 642.32 CNY/667m^(2) higher than that of the control.The findings suggested that naphthylacetic acid was suitable to be used as the foliar fertilizer for the seedlings of B.napus varieties for both vegetable and oilseed,and the additional application of selenium fertilizer demonstrated better effect.展开更多
On April 20,the LANTING Chinese Calligraphy Culture Salon Calligraphy Exhibition and Workshop,jointly organized by China Cultural Center in Mexico and the Carranza Museum,was held in Mexico City.The exhibition present...On April 20,the LANTING Chinese Calligraphy Culture Salon Calligraphy Exhibition and Workshop,jointly organized by China Cultural Center in Mexico and the Carranza Museum,was held in Mexico City.The exhibition presents works copied and created by calligraphers such as Fang Fang,Qiu Xiaoqi,Jiang Yan,Shi Yongxin,Wang Hexuan,Dong Jie,Yan Da and Yan Kan,as well as the calligraphy works of Mexican calligraphy enthusiast Miriam and other friends.展开更多
Since the official operation of the BeiDou Global Navigation Satellite System (BDS-3), it has played a vitalrole in the national economy, national defence and security, and to enhance the people’s productivity and li...Since the official operation of the BeiDou Global Navigation Satellite System (BDS-3), it has played a vitalrole in the national economy, national defence and security, and to enhance the people’s productivity and life. Basedupon the three main characteristics, route design inheritance and development, highly integrated services, and “spiraling”incremental development, this paper introduces the service composition of BeiDou Navigation Satellite System (BDS)and summarizes the evolution of four types of BDS services, that include Positioning, Navigation and Timing (PNT),message communications, navigation augmentation, and international Search and Rescue (SAR). Moreover, the designfeatures and performance of each service are discussed in detail, and the development trend of BDS services is examinedin the light of the latest round of changes in the Global Navigation Satellite System (GNSS). Finally, developmentproposals are proposed, namely, stable operation of the system, enhancement of service performance, and empowermentthrough integration of multiple means.展开更多
为研究冲击波作用下的人耳动态响应特性,设计并开展基于某单兵火箭类武器发射环境的有/无佩戴护听器装置试验研究。在分析发射冲击波特性的基础上,设计制作人耳测试装置模型,形成耳内冲击波防护试验测试方法。通过在射手位置处布设人耳...为研究冲击波作用下的人耳动态响应特性,设计并开展基于某单兵火箭类武器发射环境的有/无佩戴护听器装置试验研究。在分析发射冲击波特性的基础上,设计制作人耳测试装置模型,形成耳内冲击波防护试验测试方法。通过在射手位置处布设人耳测试装置模型以获取人耳内压力-时间变化曲线,并采用超压传感器测量对比位置处的自由场冲击波压力。利用小波分析法对测到的数据进行分析,对比分析2种发射冲击波安全限值的评价方法。研究结果表明:发射时的高声强冲击波具有不稳定性,超压峰值高,持续时间短,具有多个脉冲;高声强冲击波频带宽,成分复杂,有明显的低频率高声压特性;无护听器装置时耳内压力有所增强;佩戴护听器装置后可大幅度削弱冲击波对人耳的作用,正射手右耳超压峰值削弱95.7%、声压级峰值削弱14.8%;改进后的国家军用标准GJB 2A—1996“常规兵器发射或爆炸时脉冲噪声和冲击波对人员听觉器官损伤的限值”和美军标MIL-STD-1474E“Department of defense design criteria standard noise limits”中AHAAH模型2种方法得到的单日允许射击数范围接近,对佩戴护听器装置后的冲击波测量曲线评估的方法是可行的。研究结果可为单兵火箭类武器发射冲击波测试系统优化及改进提供理论基础和实践指导。展开更多
以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度...以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度为622.16 kg CO_(2)eq/t,其中直接碳排放强度为473.08 kg CO_(2)eq/t,间接碳排放强度为180.28 kg CO_(2)eq/t;碳汇减少的碳排放强度为31.20 kg CO_(2)eq/t。针对天然碱加工厂碳排放高的情况,提出以下对策:增加天然碱矿石与溶采液接触时间来提高碱卤浓度,减少卤水蒸发量,降低天然碱蒸发结晶工艺对热量的需求,减少燃煤热电联产蒸汽量;选择高效设备和电机,实现电耗源头控制;强化室内试验,优化工艺参数;实施天然碱加工与新能源融合,提高绿电利用率,减少网电间接碳排放;适当提高NaHCO3产能,增加CO_(2)回收利用量。展开更多
随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time l...随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time linear equalizer,CTLE),该均衡器采用2级级联结构来补偿信道衰减,并提高接收信号的质量。此外,自适应模块通过采用符号-符号最小均方误差(sign-sign least mean square,SS-LMS)算法,使抽头系数加快了收敛速度。仿真结果表明,当传输速率为16 Gbit/s时,均衡器可以补偿-15.53 dB的半波特率通道衰减,均衡器系数在16×10^(4)个单元间隔数据内收敛,并且收敛之后接收误码率低于10^(-12)。展开更多
文摘Field experiments were carried out to study the effect of different foliar fertilizer treatments on the agronomic traits,yield,and quality of Brassica napus L.for both vegetable and oil dual-use rape.The seedlings of‘Youtai 929’,‘Jinyoutai 1’,and‘Zhongshuang 11’were sprayed with potassium dihydrogen phosphate,naphthylacetic acid,and selenium fertilizer,and the agronomic traits,yield,and quality were determined.The results showed that the naphthylacetic acid treatment had the highest indexes before winter,followed by the selenium fertilizer treatment.At the harvesting stage,the plant height,number of siliquae,yield per plant,and number of effective branches on the main stem of the three varieties were the highest in the naphthylacetic acid treatment,followed by those in the potassium dihydrogen phosphate treatment.The fresh shoot quality was the best in the selenium fertilizer treatment and the second in the naphthylacetic acid treatment.‘Jinyoutai 1’applied with naphthylacetic acid had the highest economic benefit of 4971.78 CNY/667m^(2),which was 642.32 CNY/667m^(2) higher than that of the control.The findings suggested that naphthylacetic acid was suitable to be used as the foliar fertilizer for the seedlings of B.napus varieties for both vegetable and oilseed,and the additional application of selenium fertilizer demonstrated better effect.
文摘On April 20,the LANTING Chinese Calligraphy Culture Salon Calligraphy Exhibition and Workshop,jointly organized by China Cultural Center in Mexico and the Carranza Museum,was held in Mexico City.The exhibition presents works copied and created by calligraphers such as Fang Fang,Qiu Xiaoqi,Jiang Yan,Shi Yongxin,Wang Hexuan,Dong Jie,Yan Da and Yan Kan,as well as the calligraphy works of Mexican calligraphy enthusiast Miriam and other friends.
文摘Since the official operation of the BeiDou Global Navigation Satellite System (BDS-3), it has played a vitalrole in the national economy, national defence and security, and to enhance the people’s productivity and life. Basedupon the three main characteristics, route design inheritance and development, highly integrated services, and “spiraling”incremental development, this paper introduces the service composition of BeiDou Navigation Satellite System (BDS)and summarizes the evolution of four types of BDS services, that include Positioning, Navigation and Timing (PNT),message communications, navigation augmentation, and international Search and Rescue (SAR). Moreover, the designfeatures and performance of each service are discussed in detail, and the development trend of BDS services is examinedin the light of the latest round of changes in the Global Navigation Satellite System (GNSS). Finally, developmentproposals are proposed, namely, stable operation of the system, enhancement of service performance, and empowermentthrough integration of multiple means.
文摘为研究冲击波作用下的人耳动态响应特性,设计并开展基于某单兵火箭类武器发射环境的有/无佩戴护听器装置试验研究。在分析发射冲击波特性的基础上,设计制作人耳测试装置模型,形成耳内冲击波防护试验测试方法。通过在射手位置处布设人耳测试装置模型以获取人耳内压力-时间变化曲线,并采用超压传感器测量对比位置处的自由场冲击波压力。利用小波分析法对测到的数据进行分析,对比分析2种发射冲击波安全限值的评价方法。研究结果表明:发射时的高声强冲击波具有不稳定性,超压峰值高,持续时间短,具有多个脉冲;高声强冲击波频带宽,成分复杂,有明显的低频率高声压特性;无护听器装置时耳内压力有所增强;佩戴护听器装置后可大幅度削弱冲击波对人耳的作用,正射手右耳超压峰值削弱95.7%、声压级峰值削弱14.8%;改进后的国家军用标准GJB 2A—1996“常规兵器发射或爆炸时脉冲噪声和冲击波对人员听觉器官损伤的限值”和美军标MIL-STD-1474E“Department of defense design criteria standard noise limits”中AHAAH模型2种方法得到的单日允许射击数范围接近,对佩戴护听器装置后的冲击波测量曲线评估的方法是可行的。研究结果可为单兵火箭类武器发射冲击波测试系统优化及改进提供理论基础和实践指导。
文摘以天然碱加工厂为研究对象,主体工艺流程采用“湿式分解—十水碱结晶—一水碱结晶—一水碱干燥—NaHCO3加工”,供能工艺采用“燃煤热电联产+网电”,构建了完整的天然碱加工厂碳排放核算方法。研究结果表明:天然碱加工厂产生的碳排放强度为622.16 kg CO_(2)eq/t,其中直接碳排放强度为473.08 kg CO_(2)eq/t,间接碳排放强度为180.28 kg CO_(2)eq/t;碳汇减少的碳排放强度为31.20 kg CO_(2)eq/t。针对天然碱加工厂碳排放高的情况,提出以下对策:增加天然碱矿石与溶采液接触时间来提高碱卤浓度,减少卤水蒸发量,降低天然碱蒸发结晶工艺对热量的需求,减少燃煤热电联产蒸汽量;选择高效设备和电机,实现电耗源头控制;强化室内试验,优化工艺参数;实施天然碱加工与新能源融合,提高绿电利用率,减少网电间接碳排放;适当提高NaHCO3产能,增加CO_(2)回收利用量。
文摘随着先进工艺和技术的不断进步,要想保证数据在高速传输中的正确性,均衡器需要有更高的补偿和更低的功耗,才能实现高效通信。基于12 nm互补金属氧化物半导体工艺,设计了一种高增益、低功耗的自适应连续时间线性均衡器(continuous time linear equalizer,CTLE),该均衡器采用2级级联结构来补偿信道衰减,并提高接收信号的质量。此外,自适应模块通过采用符号-符号最小均方误差(sign-sign least mean square,SS-LMS)算法,使抽头系数加快了收敛速度。仿真结果表明,当传输速率为16 Gbit/s时,均衡器可以补偿-15.53 dB的半波特率通道衰减,均衡器系数在16×10^(4)个单元间隔数据内收敛,并且收敛之后接收误码率低于10^(-12)。
