Vegetation plays an important role in the environmental transport behavior of organic pollutants,however,the different roles of crops and natural vegetation have been ignored in most previous studies.In this study,we ...Vegetation plays an important role in the environmental transport behavior of organic pollutants,however,the different roles of crops and natural vegetation have been ignored in most previous studies.In this study,we developed the BETR-Urban-Rural-Veg model to quantitatively evaluate the influences of both natural vegetation and crops on the multimedia transport processes of Phenanthrene(PHE)and Benzo(a)pyrene(BaP)in mainland of China.The geographic distribution of polycyclic aromatic hydrocarbon(PAH)emissions and concentrations were consistent,displaying higher levels in northern China while lower levels in southern China.Under seasonal simulations,for both natural vegetation and crops,PAH concentrations in winter and spring were 1.5 to 27-fold higher than in summer and autumn,especially for PHE.Owing to the higher leaf area index(LAI)of natural vegetation and harvesting of crops,the filter and sequestration effect of natural vegetation was stronger than crops,while the seasonal changes of PAH concentrations in crops were more significant than natural vegetation.Temperature,precipitation rates and LAI might have important influences on seasonal concentrations and overall persistence of PAHs.PHE was more sensitive to the impacts of seasonal environmental parameters.Under different landscape scenarios,average annual PAH concentrations in natural vegetation were always a little higher than those in crops,and the overall persistence of BaP was greatly affected increasing by 15.15%-16.47%.This improved model provides a useful tool for environmental management.The results of this study are expected to support land use plans and decision-making in China's mainland.展开更多
针对瞬态电压抑制二极管(Transient Voltage Suppressors,TVS)器件浪涌能量密度提升困难、负阻最低点不稳定的问题,研究了电子辐照工艺对TVS参数的影响。电子辐照可有效降低基区少子寿命。负阻TVS器件辐照剂量越大,残压越大,浪涌能量密...针对瞬态电压抑制二极管(Transient Voltage Suppressors,TVS)器件浪涌能量密度提升困难、负阻最低点不稳定的问题,研究了电子辐照工艺对TVS参数的影响。电子辐照可有效降低基区少子寿命。负阻TVS器件辐照剂量越大,残压越大,浪涌能量密度越低。TVS负阻程度越高,残压越低,浪涌能量密度越高。文章创新提出了短基区深负阻结合低剂量辐照的方案,使产品兼具高浪涌能量密度和稳定残压的特性。展开更多
本文以芒果TV为研究对象,基于AARRR模型探讨其营销模式,旨在分析和优化芒果TV的营销策略。研究方法包括市场分析、用户行为研究以及竞争对手比较。结果表明,在用户获取阶段,芒果TV通过与中国移动、淘宝天猫等品牌的合作以及品牌推广活动...本文以芒果TV为研究对象,基于AARRR模型探讨其营销模式,旨在分析和优化芒果TV的营销策略。研究方法包括市场分析、用户行为研究以及竞争对手比较。结果表明,在用户获取阶段,芒果TV通过与中国移动、淘宝天猫等品牌的合作以及品牌推广活动,成功吸引了大量新用户。在用户激活方面,芒果TV利用其在综艺节目制作方面的优势,通过紧扣时事热点的内容制作,有效促进了用户的参与和消费决策。在用户留存方面,通过定制会员节目和举办互动活动,芒果TV显著增加了用户黏性。商业变现方面,主要通过会员订阅和广告收入实现,其中会员业务和广告收入是平台的主要收入来源。研究显示,这些策略有效提升了用户参与度和平台盈利,为在线视频平台的营销提供了有价值的见解。然而,研究也指出芒果TV在受众群体单一化、自制内容类型单一以及用户沟通渠道欠缺等方面存在的问题,需要进一步解决以实现更广泛的市场渗透和用户忠诚度提升。This paper takes Mango TV as the research subject and explores its marketing model based on the AARRR model, aiming to analyze and optimize the marketing strategies of Mango TV. The research methods include market analysis, user behavior research, and competitor comparison. The results indicate that during the user acquisition phase, Mango TV has successfully attracted a large number of new users through brand cooperation and promotional activities. In terms of user activation, Mango TV effectively promotes user participation and consumption decisions by creating content that closely follows current hot topics. Regarding user retention, Mango TV has significantly increased user stickiness by offering customized membership programs and hosting interactive activities. In terms of monetization, the main sources of revenue are membership subscriptions and advertising income, with membership services and advertising being the platform’s primary sources of revenue. The study shows that these strategies have effectively enhanced user engagement;however, it also points out that Mango TV faces issues such as a singular audience group, a limited variety of self-produced content, and a lack of user communication channels. These issues need to be further addressed to achieve broader market penetration and enhance user loyalty.展开更多
基金supported by the National Natural Science Foundation of China(Nos.42107420,U23A20157,and U1910207)Shanxi Province Science Foundation for Young Scholars(No.20210302124363).
文摘Vegetation plays an important role in the environmental transport behavior of organic pollutants,however,the different roles of crops and natural vegetation have been ignored in most previous studies.In this study,we developed the BETR-Urban-Rural-Veg model to quantitatively evaluate the influences of both natural vegetation and crops on the multimedia transport processes of Phenanthrene(PHE)and Benzo(a)pyrene(BaP)in mainland of China.The geographic distribution of polycyclic aromatic hydrocarbon(PAH)emissions and concentrations were consistent,displaying higher levels in northern China while lower levels in southern China.Under seasonal simulations,for both natural vegetation and crops,PAH concentrations in winter and spring were 1.5 to 27-fold higher than in summer and autumn,especially for PHE.Owing to the higher leaf area index(LAI)of natural vegetation and harvesting of crops,the filter and sequestration effect of natural vegetation was stronger than crops,while the seasonal changes of PAH concentrations in crops were more significant than natural vegetation.Temperature,precipitation rates and LAI might have important influences on seasonal concentrations and overall persistence of PAHs.PHE was more sensitive to the impacts of seasonal environmental parameters.Under different landscape scenarios,average annual PAH concentrations in natural vegetation were always a little higher than those in crops,and the overall persistence of BaP was greatly affected increasing by 15.15%-16.47%.This improved model provides a useful tool for environmental management.The results of this study are expected to support land use plans and decision-making in China's mainland.
文摘针对瞬态电压抑制二极管(Transient Voltage Suppressors,TVS)器件浪涌能量密度提升困难、负阻最低点不稳定的问题,研究了电子辐照工艺对TVS参数的影响。电子辐照可有效降低基区少子寿命。负阻TVS器件辐照剂量越大,残压越大,浪涌能量密度越低。TVS负阻程度越高,残压越低,浪涌能量密度越高。文章创新提出了短基区深负阻结合低剂量辐照的方案,使产品兼具高浪涌能量密度和稳定残压的特性。
文摘本文以芒果TV为研究对象,基于AARRR模型探讨其营销模式,旨在分析和优化芒果TV的营销策略。研究方法包括市场分析、用户行为研究以及竞争对手比较。结果表明,在用户获取阶段,芒果TV通过与中国移动、淘宝天猫等品牌的合作以及品牌推广活动,成功吸引了大量新用户。在用户激活方面,芒果TV利用其在综艺节目制作方面的优势,通过紧扣时事热点的内容制作,有效促进了用户的参与和消费决策。在用户留存方面,通过定制会员节目和举办互动活动,芒果TV显著增加了用户黏性。商业变现方面,主要通过会员订阅和广告收入实现,其中会员业务和广告收入是平台的主要收入来源。研究显示,这些策略有效提升了用户参与度和平台盈利,为在线视频平台的营销提供了有价值的见解。然而,研究也指出芒果TV在受众群体单一化、自制内容类型单一以及用户沟通渠道欠缺等方面存在的问题,需要进一步解决以实现更广泛的市场渗透和用户忠诚度提升。This paper takes Mango TV as the research subject and explores its marketing model based on the AARRR model, aiming to analyze and optimize the marketing strategies of Mango TV. The research methods include market analysis, user behavior research, and competitor comparison. The results indicate that during the user acquisition phase, Mango TV has successfully attracted a large number of new users through brand cooperation and promotional activities. In terms of user activation, Mango TV effectively promotes user participation and consumption decisions by creating content that closely follows current hot topics. Regarding user retention, Mango TV has significantly increased user stickiness by offering customized membership programs and hosting interactive activities. In terms of monetization, the main sources of revenue are membership subscriptions and advertising income, with membership services and advertising being the platform’s primary sources of revenue. The study shows that these strategies have effectively enhanced user engagement;however, it also points out that Mango TV faces issues such as a singular audience group, a limited variety of self-produced content, and a lack of user communication channels. These issues need to be further addressed to achieve broader market penetration and enhance user loyalty.
