Results 1 to 10 of about 1,325,673 (158)

编码通信简述

open access: yesGuangtongxin yanjiu, 1975
<正> 在一对通信线路上进行多路通信的方法基本上分作两类;一类是把各路话音信号用不同频率调制,使其置于不同的频段,然后合并起来传送 ...
王振瀛
doaj   +2 more sources

基于多路CMP信号产生及延时控制的波束成形技术研究

open access: yesGuangtongxin yanjiu, 2019
针对相控阵雷达带宽的扩展,文章提出了一种基于多路啁啾微波脉冲(CMP)信号产生及延时控制的新型波束成形系统。该系统由多个平行的具有二阶相位特性的微波光子滤波器(MPF)构成,且MPF均通过非均匀抽头延时重构获得。通过将超宽带信号输入该多路MPF系统,即可产生多路CMP信号并输入各个阵列天线阵子,借助于光纤色散,通过调谐MPF重构所需要的光载波波长即可实现脉冲信号的延时控制,从而实现信号的波束成形。仿真结果表明,该系统可以产生多路CMP信号,且信号延时量可以得到控制,并实现了波束指向的控制 ...
陈大雷, 李晓峰, 凌霄, 唐蓉
doaj   +2 more sources

基于四波混频同时传输基带信号的ROF系统

open access: yesGuangtongxin yanjiu, 2010
文章分析了用四波混频产生边带并传输基带信号的光纤无线通信(ROF)系统。该系统中心站处产生两对载波抑制边带,一对传输下行链路信号,另一对承载基带信号并在基站传输上行链路信号。通过仿真得到的系统光谱图、误码率曲线表明:加入基带信号传输后,下行信号的能量损耗不变,基带信号和上行信号却有较好的抗色散能力。
张倩, 肖赵栋
doaj   +2 more sources

Effect of Tropomyosin of Macrobrachium nipponense on Mouse Macrophage Polarization Based on Transcriptomic Analysis(基于转录组学分析日本沼虾原肌球蛋白对小鼠巨噬细胞极化的影响) [PDF]

open access: yesShipin kexue jishu xuebao, 2022
To study the effect of tropomyosin of Macrobrachium nipponense on macrophage polarization, the differential analysis of gene expression during tropomyosin-induced macrophage polarization was analyzed by transcriptomic analysis.
HU Xin(胡昕)   +4 more
doaj   +1 more source

Use of carrion fly iDNA metabarcoding to monitor invasive and native mammals

open access: yesConservation Biology, Volume 37, Issue 5, October 2023., 2023
Abstract Severely fragmented habitats increase the risk of extirpation of native mammal populations through isolation, increased edge effects, and predation. Therefore, monitoring the movement of mammal populations through anthropogenically altered landscapes can inform conservation. We used metabarcoding of invertebrate‐derived DNA (iDNA) from carrion
Kristen Fernandes   +5 more
wiley   +1 more source

Wnt/β-catenin信号通路在结直肠癌中的研究进展

open access: yesZhongguo shiyan zhenduanxue, 2021
结直肠癌(CRC)是目前消化系统常见的恶性肿瘤之一,近年来结直肠癌的发病率逐年上升,结直肠癌的高发病率、死亡率严重影响着人类的健康[1]。而与结直肠癌相关的细胞信号转导通路有多条,如Wnt/β-catenin信号通路、TGF-β/Smads信号通路、Hedgehog信号通路等,其中Wnt通路的异常激活是导致结直肠癌发生、发展的主要原因。研究显示,在结直肠癌的发生、发展、转移、复发及相关治疗的过程中,Wnt/β-catenin信号通路的异常激活起到了重要作用,大部分结直肠癌存在Wnt/β ...
焉秀章   +3 more
doaj  

基于微阵列芯片数据分析中国人冠心病的关键基因和信号通路

open access: yesZhongguo shiyan zhenduanxue, 2023
目的 基于微阵列数据分析筛选中国人冠心病(CHD)的关键基因和信号通路,以期为临床探究潜在的发病机制与治疗靶点。方法 以CHD为检索关键词从基因表达图谱(GEO)数据库下载GSE71226微阵列芯片数据进行进一步分析,利用R Studio软件中“limma”包筛选冠心病患者与正常健康人群的差异基因并对其进行可视化处理,利用R Studio软件中“clusterProfiler”包和“org.Hs.eg.db”包对差异基因进行基因本体(GO)功能富集分析和京都基因与基因组百科全书(KEGG)通路富集分析 ...
王星   +5 more
doaj  

電力線搬送通信信号が誘導によりVDSL通信に与える影響の研究 [PDF]

open access: yes, 2006
電力線搬送通信(PLC)は家庭内の配電線を通信線としても利用するため,新たに通信線を配線する必要がないといった利点があるが,通信目的として設計されていない電力線を使用するため,他の通信-の影響を検討する必要がある.通信に影響を及ぼす経路としては放射,伝導,誘導によるものが考えられるが,本論文では,通信線に誘導したPLC信号が同じ周波数帯域を使用するVDSL通信へ与える影響について検討を行った.まず,電力線から通信線に誘導する電圧を ...
クワバラ, ノブオ   +13 more
core   +2 more sources

Advanced Electrospun Nanofiber Epidermal Electronics for Electrophysiological Monitoring: From Conformal Interfaces to Multimodal Closed‐Loop Systems

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Epidermal bioelectronics is a transformative technology for continuous health monitoring and human‐computer interaction. However, the mechanical and physiological mismatch at the skin–device interface limits its long‐term application. Electrospun nanofiber membranes (ENMs), with their unique three‐dimensional hierarchical porous network and ...
Jiahua Ni   +7 more
wiley   +1 more source

Ultrasound‐Driven Dual Piezocatalytic–Electrical Scaffold Synergistically Promotes Osteoporotic Bone Healing

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT The regeneration of osteoporotic bone defects is severely hampered by compromised endogenous healing capacity, demanding advanced strategies that actively orchestrate pro‐osteogenic microenvironments. Here, we report an integrated, self‐powered osteo‐regenerative system that uniquely leverages a dual ultrasound‐responsive piezoelectric ...
Bing Tan   +6 more
wiley   +1 more source

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