Hydrogen trapping behavior has been investigated by means of thermal desorption spectroscopy(TDS) for a high strength steel after it was tempered at the temperatures of 430 °C, 500 °C and 520 °C, respec...Hydrogen trapping behavior has been investigated by means of thermal desorption spectroscopy(TDS) for a high strength steel after it was tempered at the temperatures of 430 °C, 500 °C and 520 °C, respectively. The loss of ductility was characterized by slow strain rate test(SSRT) and microscopic observation. It shows that with hydrogen charging the fracture feature transfers from ductile to brittle, resulting in the loss of ductility. Undeformed microstructure immediately beneath the fracture surface in charged specimen corresponds to badly ductility compared to the obviously streamline plastic deformation in uncharged specimen. The activation energies for the peaks present in the TDS analysis are calculated for all tested steel and the activation energies for all temperature peaks are similar, corresponding to the similar types of hydrogen traps.展开更多
For swarm robots moving in a harsh or uncharted outdoor environment without GPS guidance and global communication,algorithms that rely on global-based information are infeasible.Typically,traditional gene regulatory n...For swarm robots moving in a harsh or uncharted outdoor environment without GPS guidance and global communication,algorithms that rely on global-based information are infeasible.Typically,traditional gene regulatory networks(GRNs)that achieve superior performance in forming trapping pattern towards targets require accurate global positional information to guide swarm robots.This article presents a gene regulatory network with Self-organized grouping and entrapping method for swarms(SUNDER-GRN)to achieve adequate trapping performance with a large-scale swarm in a confined multitarget environment with access to only local information.A hierarchical self-organized grouping method(HSG)is proposed to structure subswarms in a distributed way.In addition,a modified distributed controller,with a relative coordinate system that is established to relieve the need for global information,is leveraged to facilitate subswarms entrapment toward different targets,thus improving the global multi-target entrapping performance.The results demonstrate the superiority of SUNDERGRN in the performance of structuring subswarms and entrapping 10 targets with 200 robots in an environment confined by obstacles and with only local information accessible.展开更多
Spin trapping technique was employed to study the mechanism of photocatalyticdehydrogenation of alcohol during in situ irradiation of Rh<sub>2</sub>O<sub>3</sub>/CdS powder which is sus-pended ...Spin trapping technique was employed to study the mechanism of photocatalyticdehydrogenation of alcohol during in situ irradiation of Rh<sub>2</sub>O<sub>3</sub>/CdS powder which is sus-pended in aqueous aicohol solution.Evidence for production of ·OH radical is presentedand the rate of·OH radical formation corresponds to the rate of H<sub>2</sub> evolution.On the ba-sis of the above results,it is suggested that water cleavage is an intermediate step in this reac-tion.展开更多
This article studies a class of nonlinear Kirchhoff equations with exponential critical growth,trapping potential,and perturbation.Under appropriate assumptions about f and h,the article obtained the existence of norm...This article studies a class of nonlinear Kirchhoff equations with exponential critical growth,trapping potential,and perturbation.Under appropriate assumptions about f and h,the article obtained the existence of normalized positive solutions for this equation via the Trudinger-Moser inequality and variational methods.Moreover,these solutions are also ground state solutions.Additionally,the article also characterized the asymptotic behavior of solutions.The results of this article expand the research of relevant literature.展开更多
目的研究桂皮醛对激素诱导的体外破骨细胞增殖分化及骨吸收功能增强的保护作用及分子机制。方法RANKL联合M-CSF体外诱导RAW264.7细胞分化为破骨细胞,分为对照组、地塞米松处理组和不同浓度(11.6、23.2、46.4μg·L-1)桂皮醛(cinnami...目的研究桂皮醛对激素诱导的体外破骨细胞增殖分化及骨吸收功能增强的保护作用及分子机制。方法RANKL联合M-CSF体外诱导RAW264.7细胞分化为破骨细胞,分为对照组、地塞米松处理组和不同浓度(11.6、23.2、46.4μg·L-1)桂皮醛(cinnamic alde byde,CA)干预组;TRAP染色试剂盒鉴定成熟破骨细胞;MTT法观察地塞米松和桂皮醛在不同时间点对破骨细胞增殖的抑制作用;ELISA法检测细胞培养液上清中TRACP5b的表达水平;RT-PCR分析破骨细胞相关转录因子(RANK、NFATc1)mRNA的表达状态。结果地塞米松处理后,破骨细胞的增殖分化及骨吸收功能明显增强(P<0.05);而经不同浓度桂皮醛干预后,与地塞米松组相比,细胞增殖活性、上清液中TRACP-5b的含量以及RANK、NFATc1mRNA的表达水平随药物浓度的增加呈剂量依赖性降低(P<0.05)。结论桂皮醛可有效抑制激素诱导的破骨细胞的增殖及骨吸收功能,其作用机制可能是通过下调RANK以及下游NFATc1基因的表达。展开更多
基金Project(TZ-J110302)supported by Luoyang Sunrui Special Equipment Co.Ltd.China
文摘Hydrogen trapping behavior has been investigated by means of thermal desorption spectroscopy(TDS) for a high strength steel after it was tempered at the temperatures of 430 °C, 500 °C and 520 °C, respectively. The loss of ductility was characterized by slow strain rate test(SSRT) and microscopic observation. It shows that with hydrogen charging the fracture feature transfers from ductile to brittle, resulting in the loss of ductility. Undeformed microstructure immediately beneath the fracture surface in charged specimen corresponds to badly ductility compared to the obviously streamline plastic deformation in uncharged specimen. The activation energies for the peaks present in the TDS analysis are calculated for all tested steel and the activation energies for all temperature peaks are similar, corresponding to the similar types of hydrogen traps.
基金supported in part by National Key R&D Program of China(Grant Nos.2021ZD0111501,2021ZD0111502)the Key Laboratory of Digital Signal and Image Processing of Guangdong Province+8 种基金the Key Laboratory of Intelligent Manufacturing Technology(Shantou University)Ministry of Education,the Science and Technology Planning Project of Guangdong Province of China(Grant No.180917144960530)the Project of Educational Commission of Guangdong Province of China(Grant No.2017KZDXM032)the State Key Lab of Digital Manufacturing Equipment&Technology(grant number DMETKF2019020)National Natural Science Foundation of China(Grant Nos.62176147,62002369)STU Scientific Research Foundation for Talents(Grant No.NTF21001)Science and Technology Planning Project of Guangdong Province of China(Grant Nos.2019A050520001,2021A0505030072,2022A1515110660)Science and Technology Special Funds Project of Guangdong Province of China(Grant Nos.STKJ2021176,STKJ2021019)Guangdong Special Support Program for Outstanding Talents(Grant No.2021JC06X549)。
文摘For swarm robots moving in a harsh or uncharted outdoor environment without GPS guidance and global communication,algorithms that rely on global-based information are infeasible.Typically,traditional gene regulatory networks(GRNs)that achieve superior performance in forming trapping pattern towards targets require accurate global positional information to guide swarm robots.This article presents a gene regulatory network with Self-organized grouping and entrapping method for swarms(SUNDER-GRN)to achieve adequate trapping performance with a large-scale swarm in a confined multitarget environment with access to only local information.A hierarchical self-organized grouping method(HSG)is proposed to structure subswarms in a distributed way.In addition,a modified distributed controller,with a relative coordinate system that is established to relieve the need for global information,is leveraged to facilitate subswarms entrapment toward different targets,thus improving the global multi-target entrapping performance.The results demonstrate the superiority of SUNDERGRN in the performance of structuring subswarms and entrapping 10 targets with 200 robots in an environment confined by obstacles and with only local information accessible.
文摘Spin trapping technique was employed to study the mechanism of photocatalyticdehydrogenation of alcohol during in situ irradiation of Rh<sub>2</sub>O<sub>3</sub>/CdS powder which is sus-pended in aqueous aicohol solution.Evidence for production of ·OH radical is presentedand the rate of·OH radical formation corresponds to the rate of H<sub>2</sub> evolution.On the ba-sis of the above results,it is suggested that water cleavage is an intermediate step in this reac-tion.
基金Supported by National Natural Science Foundation of China(11671403,11671236)Henan Provincial General Natural Science Foundation Project(232300420113)。
文摘This article studies a class of nonlinear Kirchhoff equations with exponential critical growth,trapping potential,and perturbation.Under appropriate assumptions about f and h,the article obtained the existence of normalized positive solutions for this equation via the Trudinger-Moser inequality and variational methods.Moreover,these solutions are also ground state solutions.Additionally,the article also characterized the asymptotic behavior of solutions.The results of this article expand the research of relevant literature.
文摘目的研究桂皮醛对激素诱导的体外破骨细胞增殖分化及骨吸收功能增强的保护作用及分子机制。方法RANKL联合M-CSF体外诱导RAW264.7细胞分化为破骨细胞,分为对照组、地塞米松处理组和不同浓度(11.6、23.2、46.4μg·L-1)桂皮醛(cinnamic alde byde,CA)干预组;TRAP染色试剂盒鉴定成熟破骨细胞;MTT法观察地塞米松和桂皮醛在不同时间点对破骨细胞增殖的抑制作用;ELISA法检测细胞培养液上清中TRACP5b的表达水平;RT-PCR分析破骨细胞相关转录因子(RANK、NFATc1)mRNA的表达状态。结果地塞米松处理后,破骨细胞的增殖分化及骨吸收功能明显增强(P<0.05);而经不同浓度桂皮醛干预后,与地塞米松组相比,细胞增殖活性、上清液中TRACP-5b的含量以及RANK、NFATc1mRNA的表达水平随药物浓度的增加呈剂量依赖性降低(P<0.05)。结论桂皮醛可有效抑制激素诱导的破骨细胞的增殖及骨吸收功能,其作用机制可能是通过下调RANK以及下游NFATc1基因的表达。
