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Channel Capacity and Power Allocation of MIMO Visible light Communication System

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China Communications 2023年第2期20卷 122-138页

作者： Shuai Ma Ruixin Yang guanjie Zhang Hang li Wen Cao linqiong Jia Yanyu Zhang Shiyin li Peng Cheng Laboratory Shenzhen 518055China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China Shenzhen Research Institute of Big Data Shenzhen 518172China School of Electronics and Control Engineering Chang’an UniversityXi’an 710064China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China National Digital Switching System Engineering&Technological Research Center Zhengzhou 450000China

In this paper,the channel capacity of the multiple-input multiple-output(MIMO)visible light communication(VLC)system is investigated under the peak,average optical and electrical power *** the channel capacity of MIMO VLC is shown to be a mixed integer programming *** address this open problem,we propose an inexact gradient projection method to find the channel capacity-achieving discrete input distribution and the channel capacity of MIMO *** we derive both upper and lower bounds of the capacity of MIMO VLC with the closed-form ***,by considering practical discrete constellation inputs,we develop the optimal power allocation scheme to maximize transmission rate of MIMO VLC *** results show that more discrete points are needed to achieve the channel capacity as SNR *** the upper and lower bounds of channel capacity are tight at low SNR *** addition,comparing the equal power allocation,the proposed power allocation scheme can significantly increase the rate for the low-order modulation inputs.

关键词： visible light communication MIMO discrete constellation inputs power allocation

Refined Spatialization of 10-Day Precipitation in China Based on GPM IMERG Data and Terrain Decomposition Using the BEMD Algorithm

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Journal of Meteorological Research 2023年第5期37卷 690-709页

作者： Xiaochen ZHU Qiangyu li Yan ZENG guanjie JIAO Wenya GU Xinfa QIU Ailifeire WUMAER School of Applied Meteorology Nanjing University of Information Science&TechnologyNanjing 210044 Key Laboratory of Transportation Meteorology China Meteorological AdministrationNanjing 210041 Jiangsu Institute of Meteorological Sciences Nanjing 210041 Nanjing Joint Institute for Atmospheric Sciences Nanjing 210041 School of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044 School of Mathematics and Statistics Nanjing University of Information Science&TechnologyNanjing 210044 School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing 210044

Continuous high spatial-resolution 10-day precipitation data are essential for crop growth services and phenological *** this study,we first use the bidimensional empirical mode decomposition(BEMD)algorithm to decompose the digital elevation model(DEM)data and obtain high-frequency(OR3),intermediate-frequency(OR5),and low-frequency(OR8)margin ***,we propose a refined precipitation spatialization model,which uses ground-based meteorological observation data,integrated multi-satellite retrievals for global precipitation measurement(GPM IMERG)satellite precipitation products,DEM data,terrain decomposition data,prevailing precipitation direction(PPD)data,and other multisource data,to construct China's high-resolution 10-day precipitation data from2001 to *** decomposition results show mountainous terrain from fine to coarse scales;and the influences of altitude,slope,and aspect on precipitation are better represented in the model after topography is ***,terrain decomposition data can be added to the model simulation to improve the quality of the simulation product;the simulation quality of the model in summer is better than that in spring and autumn,and is relatively poor in winter;and OR5 and OR8 can be improved in the simulation,with better OR5 and OR8 dynamically *** addition,preprocessing the data before precipitation spatialization is particularly *** example,adding 0.01to the 0 value of precipitation,multiplying the small value of precipitation less than 1 by 10,and performing the normal distributions transform(e.g.,Yeo–Johnson)on the data can improve the simulation quality.

关键词： bidimensional empirical mode decomposition(BEMD)algorithm 10-day precipitation terrain decomposition digital elevation model(DEM) integrated multi-satellite retrievals for global precipitation measurement(GPM IMERG)

Sustainable and biocompatible Zn-based batteries

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National Science Review 2023年第4期10卷 8-9页

作者： guanjie He Ivan P.Parkin Department of Chemical Engineering University College London Christopher Ingold Laboratory Department of Chemistry University College London

Next-generation and functional batery technologies beyond the li-ion are emerging [1]. Sustainable and biocompatible bateries are needed for certain applications, including implantable medical devices [2]. Zinc-based bateries(ZBs) are encouraging technologies with low cost, high theoretical capacity and high safety features [3].

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Exploring the mathematic equations behind the materials science data using interpretable symbolic regression

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Interdisciplinary Materials 2024年第5期3卷 637-657页

作者： guanjie Wang Erpeng Wang Zefeng li Jian Zhou Zhimei Sun School of Materials Science and Engineering Beihang UniversityBeijingChina School of Integrated Circuit Science and Engineering Beihang UniversityBeijingChina

Symbolic regression(SR),exploring mathematical expressions from a given data set to construct an interpretable model,emerges as a powerful computational technique with the potential to transform the“black box”machining learning methods into physical and chemistry interpretable expressions in material science *** this review,the current advancements in SR are investigated,focusing on the underlying theories,fundamental flowcharts,various techniques,implemented codes,and application *** predominantly,the challenging issues and future opportunities in SR that should be overcome to unlock the full potential of SR in material design and research,including graphics processing unit accelera-tion and transfer learning algorithms,the trade-off between expression accuracy and complexity,physical or chemistry interpretable SR with generative large language models,and multimodal SR methods,are discussed.

关键词： explainable machine learning material database materials science representation learning symbolic regression

地衣芽孢杆菌YDY高产吲哚乙酸发酵条件的优化

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河南科学 2018年第1期36卷 70-76页

作者：李冠杰王文丽岳丹丹赵俊杰杨金星慕琦河南科学院生物研究所有限责任公司郑州450008 河南省微生物工程重点实验室郑州450008 河南省确山县第二高级中学河南驻马店463200

为了得到地衣芽孢杆菌YDY高产吲哚乙酸最佳发酵条件,通过单因素实验和正交实验分别对碳源,氮源,金属离子等培养基各成分进行了优化筛选,确定最适的培养基成分及含量,同时还对其温度、pH、培养时间、接种量等培养条件进行了优化,确定了... 详细信息

为了得到地衣芽孢杆菌YDY高产吲哚乙酸最佳发酵条件,通过单因素实验和正交实验分别对碳源,氮源,金属离子等培养基各成分进行了优化筛选,确定最适的培养基成分及含量,同时还对其温度、pH、培养时间、接种量等培养条件进行了优化,确定了最适的培养条件.结果表明,通过优化得到了最佳培养基配方和培养条件:培养基为麦芽糖10 g/L、蛋白胨15 g/L、CaCl_20.1 g/L、pH为8.0,最适培养温度37℃,培养时间3 d,最佳接种量为1%.在最佳培养条件下,吲哚乙酸产量可达40μg/mL以上,与优化前相比,吲哚乙酸产量提高了约17μg/mL,达到了预期目的.

关键词：地衣芽孢杆菌吲哚乙酸发酵条件优化

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硅灰石在环氧树脂道路修补材料中的应用研究

非金属矿 2024年第5期47卷 24-27页

作者：孙艳刚刘丹阳王敬维许守岩李冠杰雒锋长春市城建维护集团股份有限公司吉林长春130062 吉林省先进道路材料校企联合技术创新实验室吉林长春130119 吉林大学材料与科学工程学院吉林长春130021

为减少环氧树脂基修补材料中环氧树脂胶凝材料的用量,降低原材料成本,对硅灰石作为掺和料在环氧树脂基修补材料中的应用效果开展研究。结果表明,硅灰石掺量为100%时,修补材料流动度为130 mm,抗压强度和抗折强度优于对比试样,1 d和28 d... 详细信息

为减少环氧树脂基修补材料中环氧树脂胶凝材料的用量,降低原材料成本,对硅灰石作为掺和料在环氧树脂基修补材料中的应用效果开展研究。结果表明,硅灰石掺量为100%时,修补材料流动度为130 mm,抗压强度和抗折强度优于对比试样,1 d和28 d抗压强度较对比试样分别提高56.4%和5.5%。硅灰石-环氧树脂修补砂浆28 d收缩率下降26.18%,且抗冰冻和抗盐冻性条件下,强度损失分别降低17.31%和13.04%。硅灰石-环氧树脂基道路修补材料满足JC/T 2381—2016《修补砂浆》性能要求,拓展了硅灰石的应用领域。

关键词：硅灰石环氧树脂抗压强度修补材料收缩率抗冻性能

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应用小分子干扰RNA技术以慢病毒为载体抑制乳腺癌淋巴管生成因子VEGF-C的实验研究

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中国现代医药杂志 2018年第5期20卷 17-21页

作者：罗国庆周晶晶李关杰梁计焕刘秋华李思文胡宁东夏旭广州医科大学附属第六医院清远市人民医院胸心外科广东清远511518

目的研究VEGF-C特异性小干扰RNA(small interference RNA,si RNA)对乳腺癌淋巴管生成因子-血管内皮生长因子C(vascular endothelial growth factor C,VEGF-C)表达水平及乳腺癌细胞转移能力的影响。方法实验分为感染RNAi靶点病毒的细胞组... 详细信息

目的研究VEGF-C特异性小干扰RNA(small interference RNA,si RNA)对乳腺癌淋巴管生成因子-血管内皮生长因子C(vascular endothelial growth factor C,VEGF-C)表达水平及乳腺癌细胞转移能力的影响。方法实验分为感染RNAi靶点病毒的细胞组(KD组)、感染阴性对照病毒的细胞组(NC组)和未感染任何病毒的细胞组(CON组)。以慢病毒为载体将靶向VEGF-C基因的si RNA导入体外培养的乳腺癌MDA-MB-231细胞系,应用Real-time PCR和Western blot技术检测各组细胞VEGF-C m RNA水平和蛋白水平表达差异,通过小室侵袭实验观察各组细胞侵袭能力。结果与细胞体外共培养3d后慢病毒具有较高的感染效率,在荧光显微镜下观察其感染效率达70%以上。与NC组、CON组比较,KD组细胞VEGF-C在m RNA水平表达明显降低,抑制率达60%以上,差异有统计学意义(P<0.05);在蛋白水平,KD组也受到明显抑制,条带明显模糊变淡。小室侵袭实验显示,KD组较NC组、CON组侵袭能力明显降低,差异有统计学意义(P<0.05)。结论以慢病毒为载体,特异性si RNA能够有效抑制VEGF-C的表达及乳腺癌细胞的侵袭能力,为预防与治疗乳腺癌淋巴道转移提供实验依据,同时也为下一步动物实验奠定基础。

关键词：乳腺癌 RNA干扰淋巴管新生血管内皮生长因子C

Fate of organophosphate esters from the Northwestern Pacific to the Southern Ocean:Occurrence,distribution,and fugacity model simulation

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Journal of Environmental Sciences 2024年第3期137卷 347-357页

作者： Tengda Shi Ruijing li Jie Fu Chao Hou Hui Gao guanjie Cheng Haibo Zhang Shuaichen Jin liang Kong Guangshui Na College of Marine Technology and Environment Dalian Ocean UniversityDalian 116023China Laboratory for coastal marine eco-environment process and carbon sink of Hainan province/Yazhou Bay Innovation Institute Hainan Tropical Ocean UniversitySanya 572022China National Marine Environmental Monitoring Center Dalian 116023China College of Marine Ecology and Environment Shanghai Ocean UniversityShanghai 201306China NCS Testing Technology Co. Ltd.Beijing 10081China

Eleven organophosphate esters(OPEs)in the air and seawater were investigated from the northwestern Pacific Ocean to the Southern Ocean during the 2018 Chinese 34th Antarctic Scientific *** concentration of total OPEs ranged from 164.82 to 3501.79 pg/m~3in air and from 4.54 to 70.09 ng/L in *** halogenated OPEs,tri(chloropropyl)phosphate(TCPP)and tri(2-chloroethyl)phosphate(TCEP),were generally more abundant than the non-halogenated OPEs.A levelⅢfugacity model was developed to simulate the transfer and fate of seven OPEs in the air and seawater regions of the central Ross *** model results indicate that OPEs are transferred from the air to the seawater in the central Ross Sea in summer,during which the Ross Sea acts as a final OPE *** and wet deposition dominated the processes involving OPE transfer to *** OPE degradation process was also found to be more pervasive in the atmosphere than in the seawater *** findings highlights the importance of long-range transport of OPEs and their air–seawater interface behavior in the Antarctic.

关键词： Organophosphate esters(OPEs) Long-range transport Fugacity model Antarctic Fate

海藻酸钠固定化包埋对枯草芽孢杆菌有机磷降解效果的影响

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中国农学通报 2014年第18期30卷 84-88页

作者：甄静王继雯李冠杰刘莹莹陈国参杨文玲河南省微生物工程重点实验室郑州450008 河南省科学院生物研究所有限责任公司郑州450008

为了得到菌株最佳的固定化包埋条件,采用海藻酸钠和氯化钙对枯草芽孢杆菌包埋固定化,以固定化枯草芽孢杆菌对有机磷降解率为主要指标,通过与未固定化细胞有机磷降解效果的比较,研究枯草芽孢杆菌的最佳固定化包埋条件。结果表明:当海藻... 详细信息

为了得到菌株最佳的固定化包埋条件,采用海藻酸钠和氯化钙对枯草芽孢杆菌包埋固定化,以固定化枯草芽孢杆菌对有机磷降解率为主要指标,通过与未固定化细胞有机磷降解效果的比较,研究枯草芽孢杆菌的最佳固定化包埋条件。结果表明:当海藻酸钠浓度为4%、CaCl2浓度为3%、包菌量为2%、固定化时间为2 h、达到最佳包埋效果,此时细胞表现出较好的降解性能。并且与没有包埋的细胞相比,包埋固定化细胞对pH、温度表现出很强的环境耐受性。

关键词：枯草芽孢杆菌固定化海藻酸钠温度 pH