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| 1 | Key techniques for 5G wireless communications:network architecture, physical layer,and MAC layer perspectives显示文摘The fourth generation(4G) mobile communication systems are offering service worldwide steadily.Although 4G systems could be loaded with much more services and data than previous systems, there is still a dramatic gap between the people's practical requirements and what can be offered by the 4G technologies.Consequently, the research and development for the fifth generation(5G) systems have already been started. This article presents an overview of potential network architecture and highlights several promising techniques which could be employed in the future 5G systems. These techniques include non-orthogonal multiple access(NOMA),massive multiple input and multiple output(MIMO), cooperative communications and network coding, full duplex(FD), device-to-device(D2D) communications, millimeter wave communications, automated network organization, cognitive radio(CR), and green communications. The state-of-art and implementation issue of these techniques are also addressed. | MA Zheng ZHANG ZhengQuan DING ZhiGuo FAN PingZhi LI HengChao | 2015 | Science China(Information Sciences)2015，58，4： | 49 |
| 2 | The suction force effect analysis of large civil aircraft ditching显示文摘The research on ditching is indispensable for civil airplanes made in China to obtain the airworthiness certificates.The suction force effect in the ditching process is a hot and difficult research topic.In this paper,the explicit method is employed to solve the discrete Lagrangian finite element equations.The Eulerian finite volume method(FVM) is used to solve the Eulerian control equations;the fluid-solid coupling is realized through the general coupling method.The model of large civil airplane ditching is simulated by Dytran and the model test in tank is carried out in the same condition.Based on the analysis on the impacts and generation of the suction force and a numerical example,we obtain the accurate ditching pressure and pitch angle,as well as the results from the simulation and test.The estimated pressure and pitch angles are consistent with the results in the test.In the simulation,where the suction force is considered,the attitude-time history curve is very similar to the one of the tests,whereas the attitudes in the calculation without suction force is far different from the test.It can be concluded from the results that the suction force is the key impact in ditching calculation and can be simulated by general coupling method.In addition,different weight characteristics and different initial pitch angles both result in different pressures of ditching. | ZHANG Tao LI Shu DAI HengChao | 2012 | Science China(Technological Sciences)2012，55，10： | 5 |
| 3 | Influence of using amorphous silicon stack as front heterojunction structure on performance of interdigitated back contact-heterojunction solar cell (IBC-HJ)显示文摘交错的背接触异质接面(IBC-HJ ) 太阳能电池能有超过 25% 的变换效率。然而,前面表面钝化和结构在 IBC-HJ 太阳能电池的性质上有大影响。在这份报纸,详细说明了数字模拟被执行了调查做的 n 类型和内在的非结晶的硅(a-Si ) 层的栈在 IBC-HJ 的前面表面上提供的前面表面地(FSF ) 的潜力太阳能电池。模拟结果清楚地显示 FSF 的电场应该是足够强壮的排斥少数带并且在前面表面附近堆积主要搬运人。然而,在强壮上的电场趋于驾驶电子进 a-Si 层,导致严重再结合损失。n 类型做的非结晶的硅(n-a-Si ) 层以做水平和厚度被优化了。优化的内在的非结晶的硅(i-a-Si ) 层应该与精力乐队差距是尽可能薄的(E 比 1.4 eV 大的 g ) 。另外,有关接口缺点的模拟强烈建议 FSF 是必要的前面表面什么时候没完美地被使钝化。没有 FSF, IBC-HJ 太阳能电池可以变得更敏感连接缺点密度。 | Rui JIA Ke TAO Qiang LI Xiaowan DAI Hengchao SUN Yun SUN Zhi JIN Xinyu LIU | 2017 | Frontiers in Energy2017，11，1： | 1 |
| 4 | Application of time series analysis to thcrmal error modeling on NC machine tools 显示文摘 | Li Yongxiang Tong Hengchao Cao Hongtao | 2006 | Journal of Sichuan University:Engineering Science Edition2006，38，2： | 1 |
| 5 | Bayesian wavelet shrinkage with heterogeneity-adaptive threshold for SAR image despeckling based on generalized gamma distribution显示文摘 | Li Hengchao Hong Wen Wu Yiyong | 2013 | IEEE Trans on Geoscience and Remote Sensing2013，51，4： | 1 |
| 6 | Geology, environment, and life in the deepest part of the world’s oceans显示文摘The hadal zone,mostly comprising of deep trenches and constituting of the deepest part of the world’s oceans,represents the least explored habitat but one of the last frontiers on our planet.The present scientific understanding of the hadal environment is still relatively rudimentary,particularly in comparison with that of shallower marine environments.In the last 30 years,continuous efforts have been launched in deepening our knowledge regarding the ecology of the hadal trench.However,the geological and environmental processes that potentially affect the sedimentary,geochemical and biological processes in hadal trenches have received less attention.Here,we review recent advances in the geology,biology,and environment of hadal trenches and offer a perspective of the hadal science involved therein.For the first time,we release highdefinition images taken by a new full-ocean-depth manned submersible Fendouzhe that reveal novel species with an unexpectedly high density,outcrops of mantle and basaltic rocks,and anthropogenic pollutants at the deepest point of the world’s ocean.We advocate that the hydration of the hadal lithosphere is a driving force that influences a variety of sedimentary,geochemical,and biological processes in the hadal trench.Hadal lithosphere might host the Earth’s deepest subsurface microbial ecosystem.Future research,combined with technological advances and international cooperation,should focus on establishing the intrinsic linkage of the geology,biology,and environment of the hadal trenches. | Mengran Du Xiaotong Peng Haibin Zhang Cong Ye Shamik Dasgupta Jiwei Li Jiangtao Li Shuangquan Liu Hengchao Xu Chuanxu Chen Hongmei Jing Hongzhou Xu Jun Liu Shunping He Lisheng He Shanya Cai Shun Chen Kaiwen Ta | 2021 | The Innovation2021，2，2： | 0 |
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