1 OverviewTrunking communication is an importantbranch in the mobile communications area.By adopting the PTT(Push-to-Talk)mode,half-duplex single calls and groupcalls can be directly set up.The trunkingtechnology is m...1 OverviewTrunking communication is an importantbranch in the mobile communications area.By adopting the PTT(Push-to-Talk)mode,half-duplex single calls and groupcalls can be directly set up.The trunkingtechnology is mainly employed in the field ofdedicated mobile communications.Like othermobile technologies,the development of trunkingtechnology undergoes a course from analogtechnology to digital technology and then to moreadvanced technologies,and its applied fieldsalso have been changed from dedicatednetworks to common networks.In 2002,ZTE organized its R&D institutes at展开更多
ZTE Corporation is China's largest listed telecommunication equipment manufacturer and a total solution provider. In the past 20 years ZTE has achieved a very rapid growth while in the past 3 years it attained an ...ZTE Corporation is China's largest listed telecommunication equipment manufacturer and a total solution provider. In the past 20 years ZTE has achieved a very rapid growth while in the past 3 years it attained an average annual growth rate of over 35%. In order to attain a continual growth in the coming years, ZTE is now strengthening up its globalization strategy. As a future-oriented technology, 3G has become the focus. Based on a brief introduction of 3G applications at home and abroad, this paper puts forward ZTE' s 3G development strategy.展开更多
Drought is projected to become more frequent and increasingly severe under climate change in many agriculturally important areas.However,few studies have assessed and mapped the future global crop drought risk—define...Drought is projected to become more frequent and increasingly severe under climate change in many agriculturally important areas.However,few studies have assessed and mapped the future global crop drought risk—defined as the occurrence probability and likelihood of yield losses from drought—at high resolution.With support of the GEPIC-Vulnerability-Risk model,we propose an analytical framework to quantify and map the future global-scale maize drought risk at a 0.5°resolution.In this framework,the model can be calibrated and validated using datasets from in situ observations(for example,yield statistics,losses caused by drought)and the literature.Water stress and drought risk under climate change can then be simulated.To evaluate the applicability of the framework,a global-scale assessment of maize drought risk under 1.5℃warming was conducted.At 1.5℃warming,the maize drought risk is projected to be regionally variable(high in the midlatitudes and low in the tropics and subtropics),with only a minor negative(-0.93%)impact on global maize yield.The results are consistent with previous studies of drought impacts on maize yield of major agricultural countries around the world.Therefore,the framework can act as a practical tool for global-scale,future-oriented crop drought risk assessment,and the results provide theoretical support for adaptive planning strategies for drought.展开更多
文摘1 OverviewTrunking communication is an importantbranch in the mobile communications area.By adopting the PTT(Push-to-Talk)mode,half-duplex single calls and groupcalls can be directly set up.The trunkingtechnology is mainly employed in the field ofdedicated mobile communications.Like othermobile technologies,the development of trunkingtechnology undergoes a course from analogtechnology to digital technology and then to moreadvanced technologies,and its applied fieldsalso have been changed from dedicatednetworks to common networks.In 2002,ZTE organized its R&D institutes at
文摘ZTE Corporation is China's largest listed telecommunication equipment manufacturer and a total solution provider. In the past 20 years ZTE has achieved a very rapid growth while in the past 3 years it attained an average annual growth rate of over 35%. In order to attain a continual growth in the coming years, ZTE is now strengthening up its globalization strategy. As a future-oriented technology, 3G has become the focus. Based on a brief introduction of 3G applications at home and abroad, this paper puts forward ZTE' s 3G development strategy.
基金supported by the National Natural Science Foundation of China(Grant No.41671501,41901046,91747201)。
文摘Drought is projected to become more frequent and increasingly severe under climate change in many agriculturally important areas.However,few studies have assessed and mapped the future global crop drought risk—defined as the occurrence probability and likelihood of yield losses from drought—at high resolution.With support of the GEPIC-Vulnerability-Risk model,we propose an analytical framework to quantify and map the future global-scale maize drought risk at a 0.5°resolution.In this framework,the model can be calibrated and validated using datasets from in situ observations(for example,yield statistics,losses caused by drought)and the literature.Water stress and drought risk under climate change can then be simulated.To evaluate the applicability of the framework,a global-scale assessment of maize drought risk under 1.5℃warming was conducted.At 1.5℃warming,the maize drought risk is projected to be regionally variable(high in the midlatitudes and low in the tropics and subtropics),with only a minor negative(-0.93%)impact on global maize yield.The results are consistent with previous studies of drought impacts on maize yield of major agricultural countries around the world.Therefore,the framework can act as a practical tool for global-scale,future-oriented crop drought risk assessment,and the results provide theoretical support for adaptive planning strategies for drought.
