期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
A New Strategy for Dynamic Channel Allocation in CR-WMN Based on RCA
1
作者 Kaleem Arshid Jianbiao Zhang +3 位作者 muhammad yaqub Mohammad Daud Awan Habiba Ijaz Imran Shabir Chuhan 《Computers, Materials & Continua》 SCIE EI 2023年第9期2631-2647,共17页
Channel assignment has emerged as an essential study subject in Cognitive Radio-basedWireless Mesh Networks(CR-WMN).In an era of alarming increase in Multi-Radio Multi-Channel(MRMC)network expansion interference is de... Channel assignment has emerged as an essential study subject in Cognitive Radio-basedWireless Mesh Networks(CR-WMN).In an era of alarming increase in Multi-Radio Multi-Channel(MRMC)network expansion interference is decreased and network throughput is significantly increased when non-overlapping or partially overlapping channels are correctly integrated.Because of its ad hoc behavior,dynamic channel assignment outperforms static channel assignment.Interference reduces network throughput in the CR-WMN.As a result,there is an extensive research gap for an algorithm that dynamically distributes channels while accounting for all types of interference.This work presents a method for dynamic channel allocations using unsupervisedMachine Learning(ML)that considers both coordinated and uncoordinated interference.Unsupervised machine learning uses coordinated and non-coordinated interference for dynamic channel allocation.To determine the applicability of the proposed strategy in reducing channel interference while increasingWMNthroughput,a comparison analysis was performed.When the simulation results of our proposed algorithm are compared to those of the Routing Channel Assignment(RCA)algorithm,the throughput of our proposed algorithm has increased by 34%compared to both coordinated and non-coordinated interferences. 展开更多
关键词 Carrier sensing interference coordination overlapping channels orthogonal channels
下载PDF
腐植酸产品特性及其对真菌和植物生长的影响 被引量:2
2
作者 Asma Lodhi Shermeen Tahir +8 位作者 Zafar Iqbal Ansar Mahmood muhammad Akhtar Tariq Mahmood Qureshi muhammad yaqub Asif Naeem 董心亮 管天玉 林启美 《腐植酸》 2014年第2期33-39,共7页
天然腐植酸主要来自风化煤和褐煤等,其产品主要有Pak腐植酸盐、腐植酸盐肥料、PakHumax、Hum-kara和Humide等,它们在使用之前必须了解其功效。本研究比较了4种腐植酸肥料的理化性质、光学特性以及对小麦(栽培品种Sehr)、绿豆(绿豆... 天然腐植酸主要来自风化煤和褐煤等,其产品主要有Pak腐植酸盐、腐植酸盐肥料、PakHumax、Hum-kara和Humide等,它们在使用之前必须了解其功效。本研究比较了4种腐植酸肥料的理化性质、光学特性以及对小麦(栽培品种Sehr)、绿豆(绿豆-54)、玉米(C-12)和田菁种子萌发和生长的影响,同时研究了它们对4种真菌的影响。4种腐植酸肥料的含水量为52%~71.11%,溶解度为30.2%~98.2%,密度为1.67~4.17g/mL,2%腐植酸肥料水溶液pH值为5.39~10.11,EC值为3.140~1.143mS/cm。4种腐植酸肥料的碳含量为22.95%~36.56%、氮含量为0.658%~1.183%,相应的C/N比为30.91~44.16。将4种腐植酸肥料用0.1mol/LNaOH溶液溶解,分离获得腐植酸和黄腐酸,按含碳量计算,含碳量40.3%~77.5%的为腐植酸,含碳量22.5%~59.7%的为黄腐酸。对腐植酸在400nm、500nm、600nm和700nm下的光学性质进行了研究,并对465nm和665nm条件下的吸光度进行测量,计算其比值E4/E6(即消光系数)。结果表明,E4/E6比值变化在3.64~5.48之间,且光密度随着波长的增加而降低,与腐殖质的碳含量具有显著相关性。供试的4株真菌中,根据菌落直径观察,Tricho-dermaharzianum,T.hamatum和Alternariaalternate3种真菌在0.025%腐植酸培养基上生长最好。4种腐植酸肥料对小麦、玉米、绿豆种子萌发都有抑制作用,但对田菁种子萌发具有促进作用;对小麦和玉米的根具有促进生长的作用,同时可以提高小麦和玉米芽的干物质含量,而对绿豆和田菁没有影响。研究发现,巴基斯坦市场上销售的腐植酸肥料差异很大,为保障使用者的利益,对这些肥料进行质量监测十分必要。 展开更多
关键词 腐植酸 光密度 真菌 植物生长
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部