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Power Allocation and Antenna Selection for Heterogeneous Cellular Networks

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China Communications 2023年第8期20卷 220-233页

作者： Lingyi kong Yulong Zou Yuhan Jiang Jia Zhu School of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China

In this paper,we investigate the system performance of a heterogeneous cellular network consisting of a macro cell and a small cell,where each cell has one user and one base station with multiple *** macro base station(MBS)and the small base station(SBS)transmit their confidential messages to the macro user(mu)and the small user(SU)over their shared spectrum *** enhance the system sum rate(SSR)of MBS-mu and SBS-SU transmission,we propose joint antenna selection combined with optimal power allocation(JAS-OPA)scheme and independent antenna selection combined with optimal power allocation(IAS-OPA)*** JAS-OPA scheme requires to know the channel state information(CSI)of transmission channels and interference channels,while the IAS-OPA scheme only needs to know the CSI of transmission *** addition,we carry out the analysis for conventional round-robin antenna selection combined with optimal power allocation(RR-OPA)as a benchmark *** formulate the SSR maximization problem through the power allocation between MBS and SBS and propose iterative OPA algorithms for JAS-OPA,IAS-OPA and RR-OPA schemes,*** results show that the OPA schemes outperform the equal power allocation in terms of ***,we provide the closed-form expression of the system outage probability(SOP)for IAS scheme and RR scheme,it shows the SOP performance can be significantly improved by our proposed IAS scheme compared with RR scheme.

关键词： heterogeneous networks antenna selection inter-interference power allocation

multi-functional roles of TaSSI2 involved in Fusarium head blight and powdery mildew resistance and drought tolerance

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Journal of Integrative Agriculture 2018年第2期17卷 368-380页

作者： HU Li-qin mu Jing-jing SU Pei-sen WU Hong-yan YU Guang-hui WANG Gui-ping WANG Liang MA Xin LI An-fei WANG Hong-wei ZHAO Lan-fei kong Ling-rang State Key Laboratory of Crop Biology/Shandong Key Laboratory of Crop Biology/College of Agronomy Shandong Agricultural University Tai'an 271018 P.R.China Agriculture Bureau of Rushan Rushan 264500 P.R. China Shandong Agricultural University Fertilizer Science Technology Co. Ltd. Feicheng 271600 P.R. China College of Resources and Environmental Sciences China Agricultural University Beijing 100193 P. R.China

The mutation of the gene encoding a stearoyl-acyl carrier protein fatty acid desaturase（ssi2） has been proved to enhance pathogen resistance in several plants, while it＇s potential to regulate biotic and abiotic stresses in wheat is still unclear. In this study, we cloned TaSSI2 gene in wheat and provided several evidences of its involvement in multiple biological functions. By using barley stripe mosaic virus（BSMV）-induced gene silencing（VIGS） in wheat, it was found that TaSSI2 negatively regulated both powdery mildew and Fusarium head blight（FHB） resistance, which was consistent with the phenotype observed in knock-out mutants of Kronos. The expression of TaSSI2 was down-regulated by in vitro treatments of methyl jasmonate（Me JA）, but positively regulated by salicylic acid（SA） and abscisic acid（ABA）, implying the cross-talk between different hormone signaling pathways involved in wheat to regulate biotic stresses is still to be elucidated. Furthermore, the up-regulated expression of PR4 and PR5 indicated that TaSSI2 probably regulated FHB resistance by depressing the SA signaling pathway in wheat. In addition, the over-expression of TaSSI2 increased the content of linolenic acid（18：3） and subsequently enhanced drought tolerance of transgenic Brachypodium. This phenomenon might be associated with its subcellular localization in the whole cytosol, partly overlapping with Golgi apparatus and the secreted vesicles. As a stearoyl-acyl carrier protein fatty acid desaturase, TaSSI2 was proposed to be involved in cell lipid metabolism and carried targets out of the cell from membrane or wax synthesis, resulting in enhanced drought tolerance in plant.

关键词： TaSSI2 powdery mildew Fusarium head blight drought

无标度立体Koch网络的建立及其结构性质研究

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物理学报 2010年第4期59卷 2244-2249页

作者：刘甲雪孔祥木曲阜师范大学物理工程学院曲阜273165

根据经典Koch曲线的构造,利用四面体作为迭代基元构造了一种立体Koch网络并对其结构性质做了研究,给出了该网络的度分布函数,计算了该网络的团簇系数、平均最短路径长度以及度关联函数.结果表明,所构建的网络是无标度网络,度分布临界指... 详细信息

根据经典Koch曲线的构造,利用四面体作为迭代基元构造了一种立体Koch网络并对其结构性质做了研究,给出了该网络的度分布函数,计算了该网络的团簇系数、平均最短路径长度以及度关联函数.结果表明,所构建的网络是无标度网络,度分布临界指数γ≈3.32;其团簇系数趋向于常数值0.870435;平均路径长度与网络尺寸的对数呈正比关系,说明该网络具有小世界网络特性.另外,计算结果表明knn(k)随k的变化而变化,说明该Koch网络具有一定的度关联性.

关键词：复杂网络无标度度关联 Koch网络

multilevel carbon architecture of subnanoscopic silicon for fast‐charging high‐energy‐density lithium‐ion batteries

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Carbon Energy 2024年第4期6卷 256-268页

作者： Meisheng Han Yongbiao mu Lei Wei Lin Zeng Tianshou Zhao Shenzhen Key Laboratory of Advanced Energy Storage Southern University of Science and TechnologyShenzhenChina SUSTech Energy Institute for Carbon Neutrality Southern University of Science and TechnologyShenzhenChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhenChina

Silicon(Si)is widely used as a lithium‐ion‐battery anode owing to its high capacity and abundant crustal ***,large volume change upon cycling and poor conductivity of Si cause rapid capacity decay and poor fast‐charging capability limiting its commercial ***,we propose a multilevel carbon architecture with vertical graphene sheets(VGSs)grown on surfaces of subnanoscopically and homogeneously dispersed Si–C composite nanospheres,which are subsequently embedded into a carbon matrix(C/VGSs@Si–C).Subnanoscopic C in the Si–C nanospheres,VGSs,and carbon matrix form a three‐dimensional conductive and robust network,which significantly improves the conductivity and suppresses the volume expansion of Si,thereby boosting charge transport and improving electrode *** VGSs with vast exposed edges considerably increase the contact area with the carbon matrix and supply directional transport channels through the entire material,which boosts charge *** carbon matrix encapsulates VGSs@Si–C to decrease the specific surface area and increase tap density,thus yielding high first Coulombic efficiency and electrode compaction ***,C/VGSs@Si–C delivers excellent Li‐ion storage performances under industrial electrode *** particular,the full cells show high energy densities of 603.5 Wh kg^(−1)and 1685.5 Wh L^(−1)at 0.1 C and maintain 80.7%of the energy density at 3 C.

关键词： fast charging high energy densities lithium‐ion batteries multilevel carbon architecture subnanoscopic silicon anode

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车辆的长度和速度对单车道混合交通流的影响

物理学报 2007年第2期56卷 740-746页

作者：肖瑞杰孔令江刘慕仁广西师范大学物理与电子工程学院桂林541004

在NaSch交通流模型的基础上,建立了单车道上由两种长度不一样、可分别以不同最大速度行驶的车辆构成的混合交通流模型.在周期性边界条件下,通过计算机模拟研究了车辆的长度、最大速度和混合比例系数对混合交通流的影响.

关键词：元胞自动机混合交通流计算机模拟

Biflavone Ginkgetin,a Novel Wnt Inhibitor,Suppresses the Growth of Medulloblastoma

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Natural Products and Bioprospecting 2015年第2期5卷 91-97页

作者： Zhen-Nan Ye mu-Yuan Yu Ling-Mei kong Wei-Hua Wang Yuan-Feng Yang Jie-Qing Liu Ming-Hua Qiu Yan Li State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina University of Chinese Academy of Sciences Beijing 100049China

Medulloblastoma(MB)is a form of malignant brain tumor that predominantly arises in infants and children,of which approximately 25%is due to upregulation of canonical Wnt pathway with mainly mutations in ***,Wnt inhibitors could offer rational therapeutic strategies and chemoprevention for this malignant *** our present study,we undertook a screening for antagonists of Wnt signaling from 600 natural compounds,and identified Ginkgetin,a biflavone isolated from Cephalotaxus fortunei *** inhibited Wnt pathway with an IC50 value around 5.92 lM and structure–activity relationship analysis suggested the methoxy group in Ginkgetin as a functional *** Ginkgetin showed obvious cytotoxicity in Daoy and D283 MB *** cycle analysis by flow cytometry showed that Ginkgetin induced efficiently G2/M phase arrest in Daoy *** mechanism studies showed that Ginkgetin reduced the expression of Wnt target genes,including Axin2,cyclinD1 and survivin in MB *** phosphorylation level of b-catenin also decreased in a time-and concentration-dependent ***,our data suggest that Ginkgetin is a novel inhibitor of Wnt signaling,and as such warrants further exploration as a promising antimedulloblastoma candidate.

关键词： Wnt signaling Medulloblastoma Inhibitor Biflavone Ginkgetin

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长程作用下Gauss系统的临界温度

物理学报 2005年第9期54卷 4365-4369页

作者：王春阳孔祥木曲阜师范大学物理系曲阜273165

利用傅里叶变换的方法,严格求解了d维(d=1,2和3)超立方晶格和二维三角晶格上具有长程相互作用的Gauss模型(这里考虑的长程作用有幂指数、指数和对数三种形式).得到了这些情况下系统的临界点(温度),并对不同形式的长程作用对临界点的影... 详细信息

利用傅里叶变换的方法,严格求解了d维(d=1,2和3)超立方晶格和二维三角晶格上具有长程相互作用的Gauss模型(这里考虑的长程作用有幂指数、指数和对数三种形式).得到了这些情况下系统的临界点(温度),并对不同形式的长程作用对临界点的影响进行了比较.结果表明,长程相互作用的存在,使得系统的临界温度有了一定程度的升高,它们对系统临界温度的影响与其衰减的快慢有关.

关键词： Gauss模型临界点超立方晶格三角晶格临界温度长程作用系统长程相互作用傅里叶变换立方晶格

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特殊钻石型等级晶格上S^4模型的临界性质

物理学报 2006年第9期55卷 4901-4905页

作者：尹训昌尹慧孔祥木曲阜师范大学物理系安庆师范学院物理系安庆246011

应用实空间重整化群和累积展开的方法,研究了外场中特殊钻石型等级晶格上S^4模型的相变和临界性质,求出了系统的临界点和临界指数.结果表明,此系统除了存在一个Gauss不动点外,还存在一个Wilson-Fisher不动点,与该等级晶格上的Gauss模型... 详细信息

应用实空间重整化群和累积展开的方法,研究了外场中特殊钻石型等级晶格上S^4模型的相变和临界性质,求出了系统的临界点和临界指数.结果表明,此系统除了存在一个Gauss不动点外,还存在一个Wilson-Fisher不动点,与该等级晶格上的Gauss模型相比较,系统的临界指数发生了变化.

关键词：钻石型等级晶格 S^4模型重整化群临界性质

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膨胀土原位孔内剪切试验与强度响应特征

岩土力学 2017年第2期38卷 453-461页

作者：李晶晶孔令伟穆坤中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049

针对膨胀土堑坡防护工程中不同的施工工序和降水入渗诱发灾害频发现象,基于原位孔内剪切试验,通过施加不同法向应力水平,以及成孔后注水浸泡等工况下的现场剪切试验,获得南阳某堑坡膨胀土强度特性随荷载施加方式与浸水条件的变化规律。... 详细信息

针对膨胀土堑坡防护工程中不同的施工工序和降水入渗诱发灾害频发现象,基于原位孔内剪切试验,通过施加不同法向应力水平,以及成孔后注水浸泡等工况下的现场剪切试验,获得南阳某堑坡膨胀土强度特性随荷载施加方式与浸水条件的变化规律。结果表明:膨胀土孔内剪切试验所得的剪应力-剪切位移曲线总体上呈现弱硬化变形特征;浸水对抗剪强度影响很大,最大降幅达56.9%,主要表现为黏聚力的降低,最大值达18.1 k Pa。预加载荷对浸水软化效应具有一定抑制作用,但当预加载荷超过某一应力水平时,难以发挥更大的抑制效果。黏聚力与预加载荷呈线性正相关;内摩擦角与预加载荷呈线性负相关,但降幅甚微。在实际工程中,膨胀土边坡稳定性分析应考虑降雨入渗对强度参数的影响,同时充分利用抗剪强度参数和预加载荷的线性关系,可根据工程要求达到的安全系数反推出所需的预加载荷大小,从而指导实际工程施工。该研究可为膨胀土工程场地评价、参数选取与灾害评价提供技术依据和参考。

关键词：孔内剪切试验膨胀土抗剪强度荷载施加方式浸水