检索结果-南通市图书馆

Service Function Chain Deployment Algorithm Based on Multi-Agent Deep Reinforcement Learning

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第9期80卷 4875-4893页

作者： Wanwei Huang qiancheng zhang Tao Liu YaoliXu Dalei zhang College of Software Engineering Zhengzhou University of Light IndustryZhengzhou450007China Henan Jiuyu Tenglong Information engineering Co. Ltd.Zhengzhou450052China Henan Xin’an Communication Technology Co. Ltd.Zhengzhou450007China

Aiming at the rapid growth of network services,which leads to the problems of long service request processing time and high deployment cost in the deployment of network function virtualization service function chain(SFC)under 5G networks,this paper proposes a multi-agent deep deterministic policy gradient optimization algorithm for SFC deployment(MADDPG-SD).Initially,an optimization model is devised to enhance the request acceptance rate,minimizing the latency and deploying the cost SFC is constructed for the network resource-constrained ***,we model the dynamic problem as a Markov decision process(MDP),facilitating adaptation to the evolving states of network ***,by allocating SFCs to different agents and adopting a collaborative deployment strategy,each agent aims to maximize the request acceptance rate or minimize latency and *** agents learn strategies from historical data of virtual network functions in SFCs to guide server node selection,and achieve approximately optimal SFC deployment strategies through a cooperative framework of centralized training and distributed *** simulation results indicate that the proposed method,while simultaneously meeting performance requirements and resource capacity constraints,has effectively increased the acceptance rate of requests compared to the comparative algorithms,reducing the end-to-end latency by 4.942%and the deployment cost by 8.045%.

关键词： Network function virtualization service function chain Markov decision process multi-agent reinforcement learning

Ferric ion-triggered surface oxidation of galena for efficient chalcopyrite-galena separation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 261-267页

作者： qiancheng zhang Limin zhang Feng Jiang Honghu Tang Li Wang Wei Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Changsha 410083China School of Resource and Environment Hunan University of Technology and BusinessChangsha 410083China

The efficient separation of chalcopyrite(CuFeS2)and galena(PbS)is essential for optimal resource ***,find-ing a selective depressant that is environmentally friendly and cost effective remains a *** various techniques,such as mi-croflotation tests,Fourier transform infrared spectroscopy,scanning electron microscopy(SEM)observation,X-ray photoelectron spec-troscopy(XPS),and Raman spectroscopy measurements,this study explored the use of ferric ions(Fe^(3+))as a selective depressant for *** results of flotation tests revealed the impressive selective inhibition capabilities of Fe^(3+)when used *** analysis showed that Fe^(3+)significantly reduced the adsorption of isopropyl ethyl thionocarbamate(IPETC)on the galena surface while having a minimal impact on *** analysis using SEM,XPS,and Raman spectra revealed that Fe^(3+)can oxidize lead sulfide to form compact lead sulfate nanoparticles on the galena surface,effectively depressing IPETC adsorption and increasing surface *** findings provide a promising solution for the efficient and environmentally responsible separation of chalcopyrite and galena.

关键词： galena chalcopyrite ferric ions flotation separation surface oxidation

Cooperative effect of sodium lauryl sulfate collector and sodium pyrophosphate depressant on the flotation separation of lead oxide minerals from hematite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 1975-1984页

作者： Honghu Tang Bingjian Liu Mengshan Li qiancheng zhang Xiongxing zhang Feng Jiang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Central South UniversityChangsha 410083China

As a cornerstone of the national economy,the iron and steel industry generates a significant amount of sintering dust containing both valuable lead resources and deleterious *** is a promising technique for lead recovery from sintering dust,but efficient separation from Fe_(2)O_(3) is still *** study investigated the cooperative effect of sodium lauryl sulfate(SLS,C_(12)H_(25)SO_(4)Na)and sodium pyrophosphate(SPP,Na_(4)P_(2)O_(7))on the selective flotation of lead oxide minerals(PbOHCl and PbSO_(4))from hematite(Fe_(2)O_(3)).Optimal flotation conditions were first identified,resulting in high recovery of lead oxide minerals while inhibiting Fe_(2)O_(3) *** potential measurements,Fourier transform infrared spectroscopy(FT-IR)analysis,adsorption capacity analysis,and X-ray photoelectron spectroscopy(XPS)studies offer insights into the adsorption behaviors of the reagents on mineral surfaces,revealing strong adsorption of SLS on PbOHCl and PbSO_(4) surfaces and remarkable adsorption of SPP on Fe_(2)O_(3).The proposed model of reagent adsorption on mineral surfaces illustrates the selective adsorption behavior,highlighting the pivotal role of reagent adsorption in the separation *** findings contribute to the efficient and environmentally friendly utilization of iron ore sintering dust for lead recovery,paving the way for sustainable resource management in the iron and steel industry.

关键词： sintering dust flotation separation sodium lauryl sulfate sodium pyrophosphate selective adsorption

Development of multifunctional lightweight cellular metals through interdisciplinary efforts

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第20期54卷 3844-3846页

作者： LU Tian Jian zhang qiancheng MOE Key Laboratory for Strength and Vibration School of Aerospace Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

In spite of her phenomenal economic achievement since the historically imperative implementation of the 'open door' policy in

关键词：金属蜂窝多学科多功能轻质保护环境能源资源金融危机工业化

Ultralight X-type lattice sandwich structure(I):Concept,fabrication and experimental characterization

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第8期52卷 2147-2154页

作者： zhang qiancheng HAN YunJie CHEN ChangQing LU TianJian State Key Laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China MOE Key Laboratory for Strength and Vibration School of AerospaceXi’an Jiaotong UniversityXi’an 710049China Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China

A new type of ultra-lightweight metallic lattice structure (named as the X-type structure) is reported. This periodic structure was formed by two groups of staggered struts in the traditional pyramid structure, and fabricated by folding expanded metal sheet along rows of offset nodes and then brazing the folded structure (as the core) with top and bottom facesheets to form sandwich panels. The out-of-plane compressive and shear properties of the X-type lattice sandwich structure were investigated experimentally and compared to those of the sandwich having a pyramidal truss core. It is found that the formation of the 2-dimensional staggered nodes can effectively make the X-type structure more resistant to inelastic and plastic buckling under both compression and shear loading than the pyramidal lattice truss. Obtained results show that the compressive and shear peak strengths of the X-type lattice structure are about 30% higher than those of the pyramidal lattice truss having the same relative density.

关键词： sandwich panel lattice structure X-type structure brazing plastic yielding

Three-point bending of honeycomb sandwich beams with facesheet perforations

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2018年第4期34卷 667-675页

作者： Pengbo Su Bin Han Zhongnan Zhao qiancheng zhang Tian Jian Lu State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University MOE Key Laboratory for Multifunctional Materials and Structures Xi'an Jiaotong University School of Mechanical Engineering Xi'an Jiaotong University

A novel square honeycomb-cored sandwich beam with perforated bottom facesheet is investigated under threepoint bending,both analytically and *** square holes in the bottom facesheet are characterized by the area ratio of the hole to intact facesheet（perforation ratio）.While for large-scale engineering applications like the decks of cargo vehicles and transportation ships,the perforations are needed to facilitate the fabrication process（e.g.,laser welding）as well as service maintenance,it is demonstrated that these perforations,when properly designed,can also enhance the resistance of the sandwich to *** illustration,fair comparisons among competing sandwich designs having different perforation ratios but equal mass is achieved by systematically thickening the core ***,the perforated sandwich beam is designed with a relatively thick facesheet to avoid local indention failure so that it mainly fails in two competing modes：（1）bending failure,i.e.,yielding of beam cross-section and buckling of top facesheet caused by bending moment;（2）shear failure,i.e.,yielding and buckling of core webs due to shear *** sensitivity of the failure loads to the ratio of core height to beam span is also discussed for varying perforation *** the perfo-ration ratio is increased,the load of shear failure increases due to thickening core webs,while that of bending failure decreases due to the weakening bottom *** of a sandwich beam with optimal perforation ratio is realized when the two failure loads are equal,leading to significantly enhanced failure load（up to 60%increase）relative to that of a non-perforated sandwich beam with equal mass.

关键词： Honeycomb sandwich Facesheet perforation Three-point bending Analytical model

Strength optimization of ultralight corrugated-channel-core sandwich panels

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第8期62卷 1467-1477页

作者： ZHAO ZhenYu LI Lang WANG Xin zhang qiancheng HAN Bin LU TianJian State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Nanjing Center for Multifunctional Lightweight Materials and Structures (MLMS) Nanjing University of Aeronautics and Astronautics Nanjing 210016 China School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 China

Novel ultralight sandwich panels, which are comprised of corrugated channel cores and are faced with two identical solid sheets,subjected to generalized bending are optimally designed for minimum mass. A combined analytical and numerical(finite element) investigation is carried out. Relevant failure mechanisms such as face yielding, face buckling, core yielding and core buckling are identified, the load for each failure mode derived, and the corresponding failure mechanism maps constructed. The analytically predicted failure loads and failure modes are validated against direct finite element simulations, with good agreement achieved. The optimized corrugated channel core is compared with competing topologies for sandwich construction including corrugations, honeycombs and lattice trusses, and the superiority of the proposed structure is demonstrated. Corrugated-channel-core sandwich panels hold great potential for multifunctional applications, i.e., simultaneous load bearing and active cooling.

关键词： sandwich panel corrugated channel generalized bending optimization

在线全文

学校读者我要写书评

暂无评论

高氧浓度恢复对HIIT训练后糖代谢影响

基因组学与应用生物学 2018年第9期37卷 4180-4185页

作者：张前成成都师范学院

为探讨高强度间歇训练后于恢复期吸入高浓度氧气（90%O2）对于葡萄糖耐量、胰岛素敏感度、皮质醇浓度以及血糖浓度的影响。本研究选取40名大学男子足球队队员（年龄（21±3.3）岁,身高（177.9±3.9）cm,体重（72.5±5.9）kg）接受单次... 详细信息

为探讨高强度间歇训练后于恢复期吸入高浓度氧气（90%O2）对于葡萄糖耐量、胰岛素敏感度、皮质醇浓度以及血糖浓度的影响。本研究选取40名大学男子足球队队员（年龄（21±3.3）岁,身高（177.9±3.9）cm,体重（72.5±5.9）kg）接受单次高强度间歇训练（high-intensity interval training,HIIT）,以120%-140%无氧阈值速度作为的运动强度,运动2 min,间隔休息1 min,重复7次,单次运动时间90 min,于HIIT后以高浓度氧气（90%O2）及常氧（21%O2）进行恢复90 min,于隔天交换恢复介入方式。运动前后分别对运动员进行口服葡萄糖给药,并测定给药后不同时间段的葡萄糖耐受度测试,以及分析血糖、胰岛素、皮质醇浓度。研究发现血糖值于运动后高氧恢复显著低于运动前与运动后常氧恢复,并达显著差异（p〈0.05）。胰岛素敏感度于运动前以及运动后高氧、常氧状态下恢复均未达显著差异（p〉0.05）。运动后高氧状态下恢复于第60 min、90 min之皮质醇浓度明显低于训练后常氧状态下恢复（p〈0.05）。所以单次HIIT后于高浓度氧气状态下恢复90 min,有助于减缓运动后生理压力和提升运动后肌肉细胞对葡萄糖吸收能力,是运动员进行训练时较为有效的一种运动模式。

关键词：高氧浓度运动恢复葡萄糖耐量糖代谢

Enhanced visible-light photocatalytic oxidation capability of carbon-doped TiO_2 via coupling with fly ash

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2018年第12期39卷 1890-1900页

作者： Ning An Yuwei Ma Juming Liu Huiyan Ma Jucai Yang qiancheng zhang Key Lab of Industrial Catalysis of the Inner Mongolia Autonomous Region School of Chemical EngineeringInner Mongolia University of TechnologyHuhhot 010051Inner MongoliaChina School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Energy and Power Engineering Inner Mongolia University of TechnologyHuhhot 010051Inner MongoliaChina

A carbon‐doped TiO2/fly ash support(C‐TiO2/FAS)composite photocatalyst was successfully synthesized through sol impregnation and subsequent *** carbon dopants were derived from the organic species generated during the synthesis of the C‐TiO2/FAS composite.A series of analytical techniques,such as scanning electron microscopy(SEM),attenuated total reflection‐Fourier transform infrared(ATR‐FTIR)spectroscopy,X‐ray photoelectron spectroscopy(XPS),and ultraviolet‐visible diffuse reflectance spectroscopy(UV‐Vis DRS),were used to characterize the properties of the prepared *** results indicated that C‐TiO2 was successfully coated on the FAS *** between C‐TiO2 and FAS resulted in the formation of Si–O–C and Al–O–Ti bonds at their *** formation of Si–O–C and Al–O–Ti bonds gave rise to a positive shift of the valence band edge of C‐TiO2 and enhanced its oxidation capability of photogenerated holes as well as photodegradation efficiency of methyl ***,the C‐TiO2/FAS photocatalyst exhibited favorable reusability and *** work may provide a new route for tuning the electronic band structure of TiO2.

关键词： Fly ash TiO2 Carbon doping Visible‐light photocatalysis Photocatalytic oxidation