To extend the service life of the clinched joint,a reconditioning process conducted with an additional tubular rivet was proposed in this work.Different reconditioning forces were employed to produce dissimilar recond...To extend the service life of the clinched joint,a reconditioning process conducted with an additional tubular rivet was proposed in this work.Different reconditioning forces were employed to produce dissimilar reconditioned joints by experimental method.The experimental results indicated that the neck fracture was the common failure mode of both original clinched and reconditioned joints.Compared with the original clinched joint,the shearing strength of the reconditioned joint produced by a reconditioning force of 40 kN increased from 1810.5 to 1986.47 N,and the energy absorption increased from 2.34 to 3.46 J.The range of effective reconditioning force was from 35 to 40 kN and 40 kN was the best choice for reconditioning the AA5052 failed joints.The mechanical properties of the reconditioned joints are obviously better than those of the original clinched joints,which fully demonstrates that the reconditioning method proposed in this work has a broad prospect of industrial application.展开更多
Efficient bifunction electrocatalyst is extremely interesting for electrochemical overall water splitting(OWS).Herein,a new RuO_(2)-Ru/MoO_(2)@CC(RRM/CC)bifunctional electrocatalyst was prepared via a solid phase reac...Efficient bifunction electrocatalyst is extremely interesting for electrochemical overall water splitting(OWS).Herein,a new RuO_(2)-Ru/MoO_(2)@CC(RRM/CC)bifunctional electrocatalyst was prepared via a solid phase reaction strategy.To obtain a suitable precursor for SPR,MoS_(2)nanosheets and RuO_(2)nanoparticles(NPs)were sequentially loaded onto carbon cloth conductive substrate.Subsequently,the prepared RuO_(2)/MoS_(2)/CC precursor was sealed in a furnace and annealed in Ar to trigger the redox SPR.After SPR,active RuO_(2)-Ru/MoO_(2)units containing metal–metal oxide interfaces were formed on CC substrate uniformly.The optimized RRM/CC sample annealed at 400℃exhibited a overpotential of 13 m V for hydrogen evolution reaction(HER)and 231 mV for oxygen evolution reaction(OER)at 10 mA·cm^(-2)under alkaline condition,respectively,which can be deduced to the modulated electronic structure and unique hierarchica structure.In addition,a low cell voltage of 1.48 V for OWS was required at 10 mA·cm^(-2)under alkaline condition Meanwhile,RRM/CC exhibited excellent pH-independent durability.展开更多
The continually-discovered large volumes of marine hydrocarbons indicate a huge exploration potential within the carbonate rocks of Ordovician in the Tarim Basin,northwestern China.The Middle-Upper Ordovician(O2+3)car...The continually-discovered large volumes of marine hydrocarbons indicate a huge exploration potential within the carbonate rocks of Ordovician in the Tarim Basin,northwestern China.The Middle-Upper Ordovician(O2+3)carbonate source rocks are at a highly mature stage.These rocks presently contain a low amount of total organic carbon(TOC_(pd)≤0.5%)(TOC_(pd) means the present-day TOC).A mass balance approach is used to identify the source rocks that have expelled hydrocarbons.The characteristics and origin of hydrocarbon expulsion from low-TOC_(pd) source rocks are studied,which are significant for oil exploration in the basin.The results showed that a low-TOC_(pd) O2+3 source rock having expelled hydrocarbons was type I and had a very narrow oil window.With a high rock maturity and a high original TOC(TOCo)value exceeding 1%,nearly 80%of the generated hydrocarbons were expelled.The content of gammacerane and C28 steranes in the oil and source rock extracts were relatively lean,with a V-shaped distribution of regular steranes,suggesting a possible genetic relation between the low-TOC_(pd) source rocks and the marine oil in the Tabei area.Hydrogenrich planktonic algae or acritarchs were the main hydrocarbon parent materials,distributed in the subsiding platform-slope facies.Organic matter was preserved under reducing conditions,and source rocks were formed with a favorable kerogen type and a moderate hydrocarbon generation potential.This study illustrates the hydrocarbon expulsion of low TOC_(pd) source rocks in northern Tarim Basin,which is greatly significant for analyzing the genesis of marine crude oil in Tarim Basin,and evaluating the distribution of marine source rocks.This research method is theoretically significant for oil and gas exploration in the same type of highlymature carbonate paleobasins.展开更多
基金financial supports from the National Natural Science Foundation of China (No. 51805416)the Young Elite Scientists Sponsorship Program by CAST, China (No. YESS20200279)+3 种基金the Natural Science Foundation of Hunan Province, China (No. 2020JJ5716)the Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University, China (No. ZZYJKT2019-01)the Hunan Provincial Natural Science Foundation for Excellent Young Scholars, China (No. 2021JJ20059)the Huxiang High-Level Talent Gathering Project of Hunan Province, China (No. 2019RS1002)。
文摘To extend the service life of the clinched joint,a reconditioning process conducted with an additional tubular rivet was proposed in this work.Different reconditioning forces were employed to produce dissimilar reconditioned joints by experimental method.The experimental results indicated that the neck fracture was the common failure mode of both original clinched and reconditioned joints.Compared with the original clinched joint,the shearing strength of the reconditioned joint produced by a reconditioning force of 40 kN increased from 1810.5 to 1986.47 N,and the energy absorption increased from 2.34 to 3.46 J.The range of effective reconditioning force was from 35 to 40 kN and 40 kN was the best choice for reconditioning the AA5052 failed joints.The mechanical properties of the reconditioned joints are obviously better than those of the original clinched joints,which fully demonstrates that the reconditioning method proposed in this work has a broad prospect of industrial application.
基金financially supported by Henan Provincial University Science and Technology Innovation Team(No.24IRTSTHN008)。
文摘Efficient bifunction electrocatalyst is extremely interesting for electrochemical overall water splitting(OWS).Herein,a new RuO_(2)-Ru/MoO_(2)@CC(RRM/CC)bifunctional electrocatalyst was prepared via a solid phase reaction strategy.To obtain a suitable precursor for SPR,MoS_(2)nanosheets and RuO_(2)nanoparticles(NPs)were sequentially loaded onto carbon cloth conductive substrate.Subsequently,the prepared RuO_(2)/MoS_(2)/CC precursor was sealed in a furnace and annealed in Ar to trigger the redox SPR.After SPR,active RuO_(2)-Ru/MoO_(2)units containing metal–metal oxide interfaces were formed on CC substrate uniformly.The optimized RRM/CC sample annealed at 400℃exhibited a overpotential of 13 m V for hydrogen evolution reaction(HER)and 231 mV for oxygen evolution reaction(OER)at 10 mA·cm^(-2)under alkaline condition,respectively,which can be deduced to the modulated electronic structure and unique hierarchica structure.In addition,a low cell voltage of 1.48 V for OWS was required at 10 mA·cm^(-2)under alkaline condition Meanwhile,RRM/CC exhibited excellent pH-independent durability.
基金supported by the Joint Funds of National Natural Science Foundation of China(Grant number U19B6003-02-04)the CNPC Science and Technology Major Project of the Fourteenth Five-Year Plan(Grant number 2021DJ0101)the Science Foundation of China University of Petroleum(Beijing)(Grant number 2462022YXZZ007).
文摘The continually-discovered large volumes of marine hydrocarbons indicate a huge exploration potential within the carbonate rocks of Ordovician in the Tarim Basin,northwestern China.The Middle-Upper Ordovician(O2+3)carbonate source rocks are at a highly mature stage.These rocks presently contain a low amount of total organic carbon(TOC_(pd)≤0.5%)(TOC_(pd) means the present-day TOC).A mass balance approach is used to identify the source rocks that have expelled hydrocarbons.The characteristics and origin of hydrocarbon expulsion from low-TOC_(pd) source rocks are studied,which are significant for oil exploration in the basin.The results showed that a low-TOC_(pd) O2+3 source rock having expelled hydrocarbons was type I and had a very narrow oil window.With a high rock maturity and a high original TOC(TOCo)value exceeding 1%,nearly 80%of the generated hydrocarbons were expelled.The content of gammacerane and C28 steranes in the oil and source rock extracts were relatively lean,with a V-shaped distribution of regular steranes,suggesting a possible genetic relation between the low-TOC_(pd) source rocks and the marine oil in the Tabei area.Hydrogenrich planktonic algae or acritarchs were the main hydrocarbon parent materials,distributed in the subsiding platform-slope facies.Organic matter was preserved under reducing conditions,and source rocks were formed with a favorable kerogen type and a moderate hydrocarbon generation potential.This study illustrates the hydrocarbon expulsion of low TOC_(pd) source rocks in northern Tarim Basin,which is greatly significant for analyzing the genesis of marine crude oil in Tarim Basin,and evaluating the distribution of marine source rocks.This research method is theoretically significant for oil and gas exploration in the same type of highlymature carbonate paleobasins.
