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Energy-efficient computation offloading assisted by RIS-based UAV

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 37-48页

作者： li linpei Zhao Chuan Su Yu Huo Jiahao Huang Yao li haojin School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Research Department of 5G and Drone China Mobile(Chengdu)Institute of Research and DevelopmentChengdu 610200China College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China Research and Development Center Sony(China)LimitedBeijing 100027China

The new applications surge with the rapid evolution of the mobile *** explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local *** is essential to innovate the computation offloading methods to alleviate the local computing burden and improve the offloading *** edge computing(MEC)assisted by reflecting intelligent surfaces(RIS)-based unmanned aerial vehicle(UAV)is a promising method to assist the users in executing the computation tasks in proximity at low *** this paper,we propose an energy-efficient MEC system assisted by RIS-based UAV,where the UAV with RIS mounted relays the computation tasks to the MEC *** energy efficiency maximization problem is formulated by jointly optimizing the UAV's trajectory,the transmission power of all users,and the phase shifts of the reflecting elements placed on the *** that the optimization problem is non-convex,we propose a deep deterministic policy gradient(DDPG)-based *** combining the DDPG algorithm with the energy efficiency maximization problem,the optimization problem can be ***,the numerical results are illustrated to show the performance of the system and the superiority compared with the benchmark schemes.

关键词： mobile edge computing unmanned aerial vehicle reflecting intelligent surface

高硬度六亚甲基四胺基无金属钙钛矿单晶及其高性能X射线探测

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Science China Materials 2024年第4期67卷 1348-1355页

作者：宋鑫李特伦李昊瑾林舒怡殷骏赵奎 Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China Advanced Membranes and Porous Materials Center(AMPM) King Abdullah University of Science and Technology(KAUST)Physical Sciences and Engineering Division(PSE)Thuwal 23955-6900Saudi Arabia Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China

无金属卤化物钙钛矿(MFHaP)因其出色的光电性质、化学兼容性、轻量级特征和环保性能,受到了广泛关注.传统的MFHaPs材料主要是在A位采用DABCO^(2)+(1,4-二氮杂二环[2.2.2]辛烷)及其衍生物和B位采用铵根离子组成的,这种结构一般都有较低... 详细信息

无金属卤化物钙钛矿(MFHaP)因其出色的光电性质、化学兼容性、轻量级特征和环保性能,受到了广泛关注.传统的MFHaPs材料主要是在A位采用DABCO^(2)+(1,4-二氮杂二环[2.2.2]辛烷)及其衍生物和B位采用铵根离子组成的,这种结构一般都有较低的硬度和高的离子迁移.为了克服这些难题,我们通过在A位引入了笼状有机阳离子六亚甲基四胺(hmta^(2+)),成功合成了具有较高机械硬度(1.5 GPa)的hmtaNH_(4)Br_(3)单晶.这主要得益于hmta-NH_(4)Br_(3)单晶中较短的氢键和更接近1的容忍因子.此外,hmta-NH_(4)Br_(3)单晶还表现出优异的结构稳定性和环境稳定性.采用低缺陷hmta-NH_(4)Br_(3)单晶构建的X射线探测器不仅大幅减少了离子迁移,还实现了150μC Gyair^(-1)cm^(-2)的高灵敏度,展现了其在高能辐射检测领域的巨大潜力.

关键词：六亚甲基四胺离子迁移金属卤化物有机阳离子环境稳定性 X射线探测钙钛矿高能辐射

淀粉包覆改性市政污泥用于制备新型纸板材料及其性能

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材料科学与工程学报 2024年第3期42卷 468-477页

作者：李昊津郑君卫灵君孙昊王亚玲董春好江苏省食品先进制造装备技术重点实验室江南大学机械工程学院江苏无锡214000 天津塘沽中法供水有限公司天津300000 清华苏州环境创新研究院江苏苏州215000

将无害化处理后的市政污泥作为造纸填料替代纤维应用于纸基材料可以有效缓解木质原材料的紧张状况,但是这种纸基材料机械性能较差。为解决这一问题,本研究采用不同含量的阳离子淀粉、玉米淀粉和马铃薯淀粉对市政污泥进行包覆改性,并测... 详细信息

将无害化处理后的市政污泥作为造纸填料替代纤维应用于纸基材料可以有效缓解木质原材料的紧张状况,但是这种纸基材料机械性能较差。为解决这一问题,本研究采用不同含量的阳离子淀粉、玉米淀粉和马铃薯淀粉对市政污泥进行包覆改性,并测试了用此包覆污泥作为填料制备的纸基材料的机械性能,分析比较了纯纤维、添加包覆填料和未包覆填料纸基材料的化学组分、微观形貌和热稳定性能,探索了阳离子淀粉的包覆机理以及纸基材料力学性能增强机制。结果表明,阳离子淀粉添加量为2.5%时,对污泥包覆改性效果最佳,由其制备的纸板材料的性能最优:填料留着率为79.58%,与未包覆试样相比提高了66.76%;抗张指数为8.99 N·m·g^(-1),比纯纤维试样高42.25%、比未包覆试样高45.71%。这是由于淀粉包覆可以促进污泥填料表面与纤维之间形成更多的氢键,从而增加了填料的留着率,增强了材料的机械性能和热稳定性能。污泥基填料经淀粉包覆改性后,可用于制备高留着、高性能的纸板材料,研究结果为将市政污泥作为新型造纸填料的开发利用提供理论与技术支持,开拓了造纸行业低碳循环发展的新途径。

关键词：淀粉包覆改性市政污泥新型填料机械性能资源再利用

重症超声指导下血流动力学治疗在重症肺炎患者治疗中的应用效果分析

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中国社区医师 2024年第14期40卷 37-39页

作者：韩波朱云祥李昊晋广元市中心医院四川广元628000

目的:分析重症超声指导下血流动力学治疗在重症肺炎患者治疗中的应用效果。方法:选取2019年10月—2022年10月广元市中心医院收治的120例重症肺炎患者作为研究对象,通过随机数字表法分为常规组和重症超声组,各60例。常规组实施常规监测... 详细信息

目的:分析重症超声指导下血流动力学治疗在重症肺炎患者治疗中的应用效果。方法:选取2019年10月—2022年10月广元市中心医院收治的120例重症肺炎患者作为研究对象,通过随机数字表法分为常规组和重症超声组,各60例。常规组实施常规监测下血流动力学治疗,重症超声组实施重症超声指导下血流动力学治疗。比较两组液体复苏量、液体正平衡量、尿量、乳酸水平、肺水肿发生情况。结果:两组液体复苏量、液体正平衡量比较,治疗6 h<治疗24 h<治疗48 h<治疗72 h,但重症超声组少于常规组,差异有统计学意义(P<0.001)。两组尿量比较,治疗6 h<治疗24 h<治疗48 h<治疗72 h,且重症超声组多于常规组,差异有统计学意义(P<0.001)。治疗后,两组乳酸水平低于治疗前,且重症超声组低于常规组,差异有统计学意义(P<0.001)。重症超声组肺水肿发生率低于常规组,差异有统计学意义(P=0.028)。结论:重症超声指导下血流动力学治疗在重症肺炎患者治疗中的应用效果显著,可改善液体复苏量、液体正平衡量、尿量,纠正乳酸水平,预防肺水肿。

关键词：重症超声血流动力学重症肺炎

Lead-free molecular one-dimensional perovskite for efficient X-ray detection

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Journal of Energy Chemistry 2022年第1期31卷 209-213,I0007页

作者： haojin li Xin Song Chuang Ma Zhuo Xu Nuo Bu Tinghuan Yang Qingyue Cui lili Gao Zhou Yang Fei Gao Guangtao Zhao Zhaolai Chen Zicheng Ding Kui Zhao Shengzhong(Frank)liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)University of Science and Technology of ChinaHefei 230026AnhuiChina State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinan 250100ShandongChina

In recent years,great progress has been achieved for organicinorganic halide perovskites due to their excellent optoelectronic properties and stability for photovoltaics,light emitting diodes,and high-energy radiation detection[1-5].One-dimensional(1D)perovskites,as an important derivative of three-dimensional(3D)perovskites,exhibit low exciton dissociation efficiency,which can produce strong quantum confinement and form self-trapping excited state[6],In addition,the hydrophobic properties and the inhibition of ion migration from large organic cations improve the moisture and thermal stability for optoelectronic devices.

关键词： Perovskite Molecular one-dimensional perovskite X-ray detection Self-trapped emission

A unique subseafloor microbiosphere in the Mariana Trench driven by episodic sedimentation

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Marine life Science & Technology 2024年第1期6卷 168-181页

作者： Jiwen liu Da-Wei li Xinxin He Ronghua liu haojin Cheng Chenglong Su Mengna Chen Yonghong Wang Zhongsheng Zhao Hanyue Xu Zhangyu Cheng Zicheng Wang Nikolai Pedentchouk David J.Lea-Smith Jonathan D.Todd Xiaoshou liu Meixun Zhao Xiao-Hua Zhang Frontiers Science Center for Deep Ocean Multispheres and Earth System and College of Marine Life SciencesOcean University of ChinaQingdao 266003China Laboratory for Marine Ecology and Environmental Science Laoshan LaboratoryQingdao 266237China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationOcean University of ChinaQingdao 266100China Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education/College of Marine GeosciencesOcean University of ChinaQingdao 266100China Key Laboratory of Physical Oceanography Ministry of Education/Research Vessel CentreOcean University of ChinaQingdao 266100China School of Environmental Sciences University of East AngliaNorwich NR47TJUK School of Biological Sciences University of East AngliaNorwich NR47TJUK

Hadal trenches are characterized by enhanced and infrequent high-rate episodic sedimentation events that likely introduce not only labile organic carbon and key nutrients but also new microbes that significantly alter the subseafloor ***,the role of high-rate episodic sedimentation in controlling the composition of the hadal subseafloor microbiosphere is ***,analyses of carbon isotope composition in a~750 cm long sediment core from the Challenger Deep revealed noncontinuous deposition,with anomalous ^(14)C ages likely caused by seismically driven mass transport and the funneling effect of trench *** community composition and diverse enzyme activities in the upper~27 cm differed from those at lower depths,probably due to sudden sediment deposition and differences in redox condition and organic matter *** lower depths,microbial population numbers,and composition remained relatively constant,except at some discrete depths with altered enzyme activity and microbial phyla abundance,possibly due to additional sudden sedimentation events of different *** is provided of a unique role for high-rate episodic sedimentation events in controlling the subsurface microbiosphere in Earth’s deepest ocean floor and highlight the need to perform thorough analysis over a large depth range to characterize hadal benthic *** depositional processes are likely crucial in shaping deep-water geochemical environments and thereby the deep subseafloor biosphere.

关键词： Hadal subseafloor Deep water sediment Mariana Trench Radiocarbon Microbial community Redox potential

纳米TiO_(2)硅氧烷含氟聚醚树脂复合涂料的制备及性能研究

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化工新型材料 2023年第S2期51卷 231-236,243页

作者：黎浩劲卢锡洪李厚志文浩王荣峰广东省肇庆市质量计量监督检测所肇庆526070 中山大学化学学院广州510275

在丙烯酸酯乳胶涂料中接枝聚全氟甲基异丙基醚、四甲基铵基笼型聚倍半硅氧烷和纳米TiO_(2)制备了纳米TiO_(2)硅氧烷含氟聚醚树脂复合涂料。采用傅里叶变换红外光谱仪、配置能量色散谱仪的场发射扫描电子显微镜、X射线衍射仪、电感耦合... 详细信息

在丙烯酸酯乳胶涂料中接枝聚全氟甲基异丙基醚、四甲基铵基笼型聚倍半硅氧烷和纳米TiO_(2)制备了纳米TiO_(2)硅氧烷含氟聚醚树脂复合涂料。采用傅里叶变换红外光谱仪、配置能量色散谱仪的场发射扫描电子显微镜、X射线衍射仪、电感耦合等离子体发射光谱仪、X射线荧光波谱仪等对复合涂料的形貌、结构、成分进行表征和测试。通过L_(9)(3^(4))正交试验设计得到最佳的复合涂料配方:80%丙烯酸酯+5g聚全氟甲基异丙基醚(相对分子质量3300)+2.0g四甲基铵基笼型聚倍半硅氧烷+0.8g纳米TiO_(2),纯净水作为100g复合涂料的补充溶剂。采用该配方制备的复合涂料耐强酸腐蚀效果最好。

关键词：丙烯酸酯涂料正交试验设计耐强酸腐蚀

自来水厂尾泥的光催化改性及其制备的纸板材料性能

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材料科学与工程学报 2023年第4期41卷 665-671页

作者：张美珠卫灵君张依媛孙昊李昊津江苏省食品先进制造装备技术重点实验室江南大学机械工程学院江苏无锡214000 清华苏州环境创新研究院江苏苏州215000

为了缓解国内自来水厂尾泥的处置问题和造纸用原材料资源紧缺的现象,本研究提出了一种自来水厂尾泥光催化改性处理并应用于造纸填料的解决办法。首先对自来水厂尾泥进行成分和粒径分析,其次利用光催化技术处理自来水厂尾泥,探讨催化剂... 详细信息

为了缓解国内自来水厂尾泥的处置问题和造纸用原材料资源紧缺的现象,本研究提出了一种自来水厂尾泥光催化改性处理并应用于造纸填料的解决办法。首先对自来水厂尾泥进行成分和粒径分析,其次利用光催化技术处理自来水厂尾泥,探讨催化剂含量、光催化温度对其光催化反应效率的影响规律。最后,添加30%光催化改性处理后的自来水厂尾泥作为造纸填料制备新型低成本且高性能的纸包装材料。实验发现光催化处理可以有效减少尾泥21.5%有机化合物含量。光催化处理后的尾泥可以填充于纸纤维的空隙中,增强纤维之间的连接。光催化处理后尾泥制备的纸板的抗张指数为20.11 N·m·g^(-1),较纯纤维纸板的提高了19.28%,较未光催化处理的尾泥制备的纸板提高了34.43%。光催化处理后生物质填料的留着率为75.86%,较未处理尾泥的生物质填料提高了79.42%。光催化处理后尾泥制备后纸板也就具备优良的热稳定性。

关键词：自来水厂尾泥光催化造纸填料纸包装材料资源化利用

Low Trap Density Para-F Substituted 2D PEA_(2)PbI_(4)(X=Cl,Br,I)Single Crystals with Tunable Optoelectrical Properties and High Sensitive X-Ray Detector Performance

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研究(英文) 2023年第1期 273-283页

作者： Jiayu Di haojin li li Chen Siyu Zhang Yinhui Hu Kai Sun Bo Peng Jie Su Xue Zhao Yuqi Fan Zhenhua lin Yue Hao Peng Gao Kui Zhao Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University710071 XianChina Advanced Interdisciplinary Research Center for Flexible Electronics Academy of Advanced Interdisciplinary ResearchXidian University710071 Xi'anChina Key Laboratory of Applied Surface and Collid Chemistry National Ministry of EducationSchool of Materials Science and EngineeringShaanxi Normal University710119 Xi'anChina CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Exploring halogen engineering is of great significance for reducing the density of defect states in crystals of organic-inorganic hybrid perovskites and hence improving the crystal ***,high-quality single crystals of PEA_(2)PbI_(4)(X=CI,Br,I)and their para-F(p-F)substitution analogs are prepared using the facile solution method to study the effects of both p-F substitution and halogen anion *** p-F substitution,the triclinic PEA_(2)PbX_(4)(X=Cl,Br)and cubic PEA_(2)PbX_(4)(X=I)crystals unifies to monoclinic crystal structure for p-F-PEA_(2)PbX_(4)(X=Cl,Br,I)*** p-F substitution and halogen engineering,together with crystal structure variation,enable the tunability of optoelectrical ***,after the p-F substitution,the energy levels are lowered with increased Fermi levels,and the bandgaps of p-F-PEA_(2)PbX_(4)(X=Cl,Br,I)are slightly *** from the enhancement of the charge transfer and the reduced trap density by p-F substitution and halogen anion engineering,the average carrier lifetime of the p-F-PEA_(2)PbI_(4)is obviously *** with PEA_(2)PbI_(4)the X-ray detector based on p-F-PEA_(2)PbI_(4)single crystals exhibits higher radiation stability under high-dose X-ray irradiation,implying long-term operando stability.

关键词： properties stability substitution