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UAV-assisted cooperative offloading energy efficiency system for mobile edge computing

Digital Communications and Networks 2024年第1期10卷 16-24页

作者： Xue-Yong Yu wen-Jin niu Ye Zhu Hong-Bo Zhu Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing210003China Engineering Research Centerof Health Service System Based on Ubiquitous Wireless Networks Ministry of EducationNanjng Universityof Posts and Telecommunications Nanjing210003China

Reliable communication and intensive computing power cannot be provided effectively by temporary hot spots in disaster areas and complex terrain ground *** this has greatly developed the application and integration of UAV and Mobile Edge Computing(MEC)to the Internet of Things(loT).However,problems such as multi-user and huge data flow in large areas,which contradict the reality that a single UAV is constrained by limited computing power,still *** to allowing UAV collaboration to accomplish complex tasks,cooperative task offloading between multiple UAVs must meet the interdependence of tasks and realize parallel processing,which reduces the computing power consumption and endurance pressure of *** the computing requirements of the user terminal,delay constraint of a computing task,energy constraint,and safe distance of UAV,we constructed a UAV-Assisted cooperative offloading energy efficiency system for mobile edge computing to minimize user terminal energy ***,the resulting optimization problem is originally nonconvex and thus,difficult to solve *** tackle this problem,we developed an energy efficiency optimization algorithm using Block Coordinate Descent(BCD)that decomposes the problem into three convex ***,we jointly optimized the number of local computing tasks,number of computing offloaded tasks,trajectories of UAV,and offloading matching relationship between multi-UAVs and multiuser *** results show that the proposed approach is suitable for different channel conditions and significantly saves the user terminal energy consumption compared with other benchmark schemes.

关键词： Computation offloading Internet of things(IoT) Mobile edge computing(MEC) Block coordinate descent(BCD)

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Heteroepitaxial growth of Au@Pd core–shell nanocrystals with intrinsic chiral surfaces for enantiomeric recognition

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Rare Metals 2024年第1期43卷 225-235页

作者： Feng-Xia Wu Feng-Hua Li Xia-Li Lv Qi-Xian Zhang Guo-Bao Xu wen-Xin niu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Shaoxing Institute of Technology Shanghai UniversityShaoxing 312000China University of Science and Technology of China Hefei 230026China School of Materials Science and Engineering Shanghai UniversityShanghai 200436China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314113China University of Chinese Academy of Sciences Beijing 100039China

Noble metal surfaces with intrinsic chirality serve as an ideal candidate for investigating enantioselective chemistry due to their superior chemical durability and high catalytic ***,significant advance has been made in synthesizing metal nanocrystals with intrinsic ***,the majority reports are limited to ***,through a heteroepitaxial growth strategy,the synthesis of metal nanocrystals with intrinsic chirality to palladium was extended for the first time and their application in enantioselective recognition was *** heteroepitaxial growth strategy allows for transferring the chirality of homochiral Au nanocrystals to Au@Pd core–shell *** employing the chiral Au@Pd nanocrystals as enantiomeric recognizing elements,a series of electrochemical sensors for chiral discrimination were *** optimal conditions,the peak potential between D-dihydroxyphenylalanine(D-DOPA)and L-dihydroxyphenylalanine(L-DOPA)is about 80 m V,and the peak current of D-DOPA is 2 times as much as that of L-DOPA,which enables the determination of the enantiomeric excess(EE,%)of ***,this report not only introduces a heteroepitaxial growth strategy to synthesize metal nanocrystals with intrinsic chirality,but also demonstrates the superior capability of integrating intrinsic chirality and catalytic properties into metal nanocrystals for chiral recognition.

关键词： Core–shell nanostructures Chirality transfer Electrochemical sensors Chiral recognition Chiroplasmonics

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Mycoplasma hominis Pneumonia Presented as a Cavitary Mass with a Halo Sign in an Immunocompetent Adult Male:A Case Report

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Infectious Diseases & Immunity 2024年第3期4卷 142-145页

作者： Pan-Pan Xie Yao Yao Ning Yang wen-Kai niu Xin Yuan Department of Respiratory and Critical Care Diseases Senior Department of Infectious Diseasesthe Fifth Medical Center of Chinese PLA General HospitalNational Clinical Research Center for Infectious DiseasesBeijing 100039China Anhui Medical University PLA 307 Clinical College Beijing 100039China.

Mycoplasma hominis is an opportunistic microorganism that colonizes the genitourinary tract and causes genitourinary ***,pulmonary infections caused by *** have rarely been reported in immunocompetent ***,we report a rare case of an immunocompetent adult male with *** pneumonia who presented with multiple pulmonary nodules that progressed to a cavitary mass with a halo *** presence of *** infection was confirmed using multiplex polymerase chain reaction(mPCR)of the bronchoalveolar lavage *** patient demonstrated no response to the initial levofloxacin therapy;however,the symptoms subsequently improved after the administration of *** may be an underestimated causative agent of community-acquired pneumonia of unknown etiology in immunocompetent adults,and the involvement of the organism should be especially suspected in sexually active *** diagnostic methods,such as mPCR,can be used to identify the etiology of atypical *** antibiotics are crucial for effective treatment.

关键词： M.hominis Halo sign Cavitary pneumonia Extragenital infections Case report

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同期声和现场声在电视新闻采访编辑制作中的运用

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电视技术 2024年第7期48卷 85-87页

作者：牛雯河南广播电视台河南郑州450008

在新闻传播高度发展的时代背景下,介绍同期声和现场声在电视新闻中的重要性及其应用现状。探讨同期声和现场声在电视新闻采访编辑制作中的具体运用,包括其作用、存在的不足以及针对性的运用技巧等内容。

关键词：电视新闻采访编辑制作同期声现场声

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衬板叠轧Mg/Al复合板基体组织演变优化强塑性机制

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Journal of Central South University 2024年第2期31卷 369-383页

作者：张安鑫李峰牛文涛高融合孙璐 School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification&Green Forming Technology Harbin 150040China

Mg/Al复合板兼并了镁合金的轻质性及铝合金的可塑性、耐腐蚀等性能,显著增强了其综合性能,但制造周期长、工艺要求高等不足制约了异质复合板成形技术的快速发展。为此,本文提出一种衬板辅助叠轧成形新方法。研究结果表明:3ARB时Mg/Al复... 详细信息

Mg/Al复合板兼并了镁合金的轻质性及铝合金的可塑性、耐腐蚀等性能,显著增强了其综合性能,但制造周期长、工艺要求高等不足制约了异质复合板成形技术的快速发展。为此,本文提出一种衬板辅助叠轧成形新方法。研究结果表明:3ARB时Mg/Al复合板抗拉强度可达235 MPa,伸长率为14.7%,镁板中出现明显的韧窝,呈韧性断裂特征,综合性能为最佳。由于此时Mg板基面滑移与非基面滑移同时开动,促进了动态再结晶的生成,此时Mg板再结晶比例为77.21%。随着累积叠轧的进行,大角度晶界增加和晶粒细化明显,原始晶粒已经基本破碎细化成等轴晶,Mg、Al基体硬度波动逐渐减小,复合板内部结构逐渐趋于稳定。本研究可为高性能异质复合板成形制造提供了一种新思路。

关键词：衬板叠轧 Mg/Al复合板再结晶晶粒细化强塑性

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李达社会革命思想的形成和发展

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山西大同大学学报（社会科学版） 2024年第4期38卷 17-21页

作者：牛文慧海南师范大学马克思主义学院海南海口570100 山西大同大学云冈学学院山西大同037009

李达在回答“中国向何处去”、探寻“中国的出路”的历史进程中形成了较为丰富的社会革命思想。李达运用马克思主义基本原理,系统研究中国社会革命进程中的历史性变革,形成了逻辑严密、内涵深刻的社会革命思想体系。这一思想体系经历了... 详细信息

李达在回答“中国向何处去”、探寻“中国的出路”的历史进程中形成了较为丰富的社会革命思想。李达运用马克思主义基本原理,系统研究中国社会革命进程中的历史性变革,形成了逻辑严密、内涵深刻的社会革命思想体系。这一思想体系经历了萌芽、形成、成熟和继续发展四个阶段。建党初期,李达实现了从民主主义者向马克思主义者的转变,社会革命思想初步萌芽;大革命失败后,李达结合中国革命实际,深入剖析中国社会革命核心问题,社会革命思想逐渐成形;新中国成立前夕,李达提出了一系列涉及哲学、政治、经济、文化等诸多方面的革命性观点,社会革命思想日渐成熟;新中国成立后,李达提出了诸多关于社会主义改造与建设的观点与主张,社会革命思想继续发展。

关键词：李达社会革命马克思主义中国化时代化

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可变二维码印制要点研究

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中国标准化 2024年第7期 148-151页

作者：牛文慧邯郸市标准化所

为了提升可变二维码的首读率,提高数据共享效率,更好地发挥可变二维码数据共享中的作用,特开展可变二维码印制质量研究。本文采用试验分析法,研究可变二维码生成软件参数设置、承印基材表面处理技术要求、喷印设备控制对其质量等级的影... 详细信息

为了提升可变二维码的首读率,提高数据共享效率,更好地发挥可变二维码数据共享中的作用,特开展可变二维码印制质量研究。本文采用试验分析法,研究可变二维码生成软件参数设置、承印基材表面处理技术要求、喷印设备控制对其质量等级的影响。确定了可变二维码印制前承印材料预处理应达到的要求,承印材料光学特性参数不透明度、符号反差、最小边缘反差预测值。通过优化可变二维码设计、严格承印材料表面处理和控制喷码过程,可有效提升可变二维码印制质量。

关键词：二维码设计基材处理印制

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金花清感颗粒联合布地奈德、沙丁胺醇、异丙托溴铵三联雾化吸入疗法在儿童肺炎支原体肺炎中的应用观察

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中国现代医学杂志 2024年第5期34卷 89-94页

作者：牛文泽张红强常熟市第二人民医院儿科江苏常熟215500 常熟市第二人民医院影像中心江苏常熟215500

目的分析金花清感颗粒联合布地奈德、沙丁胺醇、异丙托溴铵三联雾化吸入治疗儿童肺炎支原体肺炎(MPP)的效果。方法前瞻性选取2022年2月—2023年2月常熟市第二人民医院收治的114例MPP患儿为研究对象,按照随机数字表法分为对照组、研究组... 详细信息

目的分析金花清感颗粒联合布地奈德、沙丁胺醇、异丙托溴铵三联雾化吸入治疗儿童肺炎支原体肺炎(MPP)的效果。方法前瞻性选取2022年2月—2023年2月常熟市第二人民医院收治的114例MPP患儿为研究对象,按照随机数字表法分为对照组、研究组,每组57例。对照组给予布地奈德、沙丁胺醇、异丙托溴铵三联雾化吸入治疗,研究组在对照组基础上给予金花清感颗粒,连续治疗10 d评估效果。比较两组症状改善情况、肺功能、临床疗效、气道重塑指标、炎症因子、T淋巴细胞亚群及药物不良反应发生情况。结果研究组发热消退时间、咳嗽消失时间、肺部啰音消失时间均短于对照组(P0.05)。结论金花清感颗粒联合布地奈德、沙丁胺醇、异丙托溴铵三联雾化吸入治疗儿童MPP疗效显著,可改善肺功能,抗气道重塑,抑制炎症反应,改善T淋巴细胞亚群,且安全性良好。

关键词：肺炎支原体肺炎儿童金花清感颗粒布地奈德沙丁胺醇异丙托溴铵效果

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Synergistic strengthening mechanism of gradient structure AZ31 magnesium alloy plate in hard plate rolling

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Progress in Natural Science:Materials International 2023年第5期33卷 652-659页

作者： wen Tao niu Feng Li Jia Yang Zhang Chao Li Lu Sun School of Materials Science and Chemical Engineering Harbin University of Science and Technology Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification & Green Forming Technology Harbin University of Science and Technology

Compared with homogeneous structural materials, gradient structural materials are easier to realize the strengthductility optimization. Research on the strengthening mechanism of different gradient structure materials is a meaningful way to broaden the application of gradient structure materials. In this paper, the AZ31 magnesium alloy plate was rolled by hard plate rolling. The gradient structure was controlled by changing the initial plate thickness. When the initial plate thickness was 4 mm, AZ31 magnesium alloy shows excellent strength and ductility, the tensile strength was 282.2 MPa, and the ductility was 28.4 %. The change of the initial plate thickness changes the stress state which forming a gradient structure with different characteristic layers. The extra strengthening between different characteristic layers improves the properties of gradient structure, which makes the magnesium alloy change from a uniaxial stress state to a multi-axial stress state during the tensile process. The increase of the characteristic layer induces more geometrically necessary dislocation accumulation, improving the gradient structure’s strength and ductility. This research provides a new design strategy for the forming and performance optimization of gradient structure magnesium alloy plate by hard plate rolling, which has good industrial production and application potential.

关键词： Hard plate rolling Gradient structure AZ31 magnesium alloy Extra strengthening Geometrically necessary dislocation

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Microstructure Characteristics and Corrugation Interface Behavior of Al/Mg/Al Composite Plate Rolled Under Large Strain

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 827-838页

作者： Peng-Da Huo Feng Li wen-Tao niu Rong-He Gao&An-Xin Zhang School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin150040China Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin150001China Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin150001China

Traditional rolled(TR)aluminum(Al)/magnesium(Mg)/aluminum(Al)composite plates have many bottlenecks such as multiple passes,low interlaminar strength,and weak mechanical *** this paper,the hard-plate rolling(HPR)method was used to prepare Al/Mg/Al composite plates under a single pass reduction of 60%.The results show that the ultimate tensile strength(UTS)of the composite plate obtained by hard-plate rolling is 262.3 MPa,and the percentage of total elongation at fracture(At)is 12.3%,which is 31.6%and 37.4%higher than that of the traditional rolling,*** is attributed to the unique corrugated interlocking structure of the interface of the composite plate caused by hard-plate *** shear texture produced by the Mg plate weakens the strong-basal *** the same time,the strong basal slip and the large amount of energy stored in the deformed grains provide favorable conditions for dynamic recrystallized(DRX)*** microstructure is deeply refined by DRX,and the strength and plasticity of the composite plate are improved *** provides scientific guidance for the development of high-performance lightweight composite plates and the research on hard-plate rolling technology and also has good industrial production and application potential.

关键词： Hard-plate rolling Al/Mg/Al composite plate Corrugated interface Strength-plasticity Strengthening mechanism

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