In order to improve the weldability of duplex stainless steels,obtaining more secondary austenite in the weld metal is an effective way.Therefore,optimizing the secondary austenite by changing its morphology,volume fr...In order to improve the weldability of duplex stainless steels,obtaining more secondary austenite in the weld metal is an effective way.Therefore,optimizing the secondary austenite by changing its morphology,volume fraction and stability may be expected to enhance the ductility of the weld.The secondary austenite morphologies in the fusion zone of the laser continuously heat treated welds of 2205 duplex stainless steel were investigated.The secondary austenite morphologies were found to be influenced by different laser power level.The secondary austenite with penniform,freely grown and dendritic shape appeared in the course of 4,6 and 8 kW continuous heat treatment,respectively.It was found that there were three kinds of morphologies of secondary austenite in the fusion zone treated by different power,i.e.,widmannst¨atten austenite,grain boundary austenite and intragranular austenite.The results demonstrated that the mechanism of the secondary austenite formation was a displacement mechanism during the initial austenite lath formation and a diffusion mechanism during cooling.The nitrides provided the nitrogen for the transformation and at the same time acted as nucleation sites for the secondary austenite.展开更多
OBJECTIVE: To evaluate the effect of electroacupuncture as an adjuvant treatment with first-line medications on bone metabolism biomarkers and interleukin-17(IL-17) in the peripheral blood of patients with rheumatoid ...OBJECTIVE: To evaluate the effect of electroacupuncture as an adjuvant treatment with first-line medications on bone metabolism biomarkers and interleukin-17(IL-17) in the peripheral blood of patients with rheumatoid arthritis(RA).METHODS: Sixty RA patients were randomized into three groups. The control group was treated with methotrexate plus leflunomide(MTX + LEF),the acupuncture group was treated with simple needling plus MTX + LEF, and the patients in the electroacupuncture(EA) group were treated with EA plus MTX + LEF. EA or acupuncture was applied every other day for a total of 10 times over a treatment period of 8 weeks.RESULTS: In all three treatment groups, serum levels of the bone metabolism markers PICP, N-MID,and B-ALP were elevated and the concentrations of the inflammatory markers β-CTx, IL-17, CRP, and TRACP-5b were reduced after treatment. These differences were significant for the EA group but not the other groups(P < 0.05).CONCLUSION: EA could effectively reduce the suffering and improve the quality of life of RA patients. It is a promising adjuvant therapy for enhancing the effectiveness of clinical therapeutics.展开更多
Fault detection and diagnosis(FDD)plays a significant role in ensuring the safety and stability of chemical processes.With the development of artificial intelligence(AI)and big data technologies,data-driven approaches...Fault detection and diagnosis(FDD)plays a significant role in ensuring the safety and stability of chemical processes.With the development of artificial intelligence(AI)and big data technologies,data-driven approaches with excellent performance are widely used for FDD in chemical processes.However,improved predictive accuracy has often been achieved through increased model complexity,which turns models into black-box methods and causes uncertainty regarding their decisions.In this study,a causal temporal graph attention network(CTGAN)is proposed for fault diagnosis of chemical processes.A chemical causal graph is built by causal inference to represent the propagation path of faults.The attention mechanism and chemical causal graph were combined to help us notice the key variables relating to fault fluctuations.Experiments in the Tennessee Eastman(TE)process and the green ammonia(GA)process showed that CTGAN achieved high performance and good explainability.展开更多
基金support from the National Basic Research Program of China(973 Program,No. 2010CB630800)the Shanghai Municipal Science and Technology Commission Foundation of China (Grant No. 0852nm02500)
文摘In order to improve the weldability of duplex stainless steels,obtaining more secondary austenite in the weld metal is an effective way.Therefore,optimizing the secondary austenite by changing its morphology,volume fraction and stability may be expected to enhance the ductility of the weld.The secondary austenite morphologies in the fusion zone of the laser continuously heat treated welds of 2205 duplex stainless steel were investigated.The secondary austenite morphologies were found to be influenced by different laser power level.The secondary austenite with penniform,freely grown and dendritic shape appeared in the course of 4,6 and 8 kW continuous heat treatment,respectively.It was found that there were three kinds of morphologies of secondary austenite in the fusion zone treated by different power,i.e.,widmannst¨atten austenite,grain boundary austenite and intragranular austenite.The results demonstrated that the mechanism of the secondary austenite formation was a displacement mechanism during the initial austenite lath formation and a diffusion mechanism during cooling.The nitrides provided the nitrogen for the transformation and at the same time acted as nucleation sites for the secondary austenite.
基金Supported by funding from the Traditional Chinese Medicine Project of Chongqing to Y.J.(Grant number ZY201602140)
文摘OBJECTIVE: To evaluate the effect of electroacupuncture as an adjuvant treatment with first-line medications on bone metabolism biomarkers and interleukin-17(IL-17) in the peripheral blood of patients with rheumatoid arthritis(RA).METHODS: Sixty RA patients were randomized into three groups. The control group was treated with methotrexate plus leflunomide(MTX + LEF),the acupuncture group was treated with simple needling plus MTX + LEF, and the patients in the electroacupuncture(EA) group were treated with EA plus MTX + LEF. EA or acupuncture was applied every other day for a total of 10 times over a treatment period of 8 weeks.RESULTS: In all three treatment groups, serum levels of the bone metabolism markers PICP, N-MID,and B-ALP were elevated and the concentrations of the inflammatory markers β-CTx, IL-17, CRP, and TRACP-5b were reduced after treatment. These differences were significant for the EA group but not the other groups(P < 0.05).CONCLUSION: EA could effectively reduce the suffering and improve the quality of life of RA patients. It is a promising adjuvant therapy for enhancing the effectiveness of clinical therapeutics.
基金support of the National Key Research and Development Program of China(2021YFB4000505).
文摘Fault detection and diagnosis(FDD)plays a significant role in ensuring the safety and stability of chemical processes.With the development of artificial intelligence(AI)and big data technologies,data-driven approaches with excellent performance are widely used for FDD in chemical processes.However,improved predictive accuracy has often been achieved through increased model complexity,which turns models into black-box methods and causes uncertainty regarding their decisions.In this study,a causal temporal graph attention network(CTGAN)is proposed for fault diagnosis of chemical processes.A chemical causal graph is built by causal inference to represent the propagation path of faults.The attention mechanism and chemical causal graph were combined to help us notice the key variables relating to fault fluctuations.Experiments in the Tennessee Eastman(TE)process and the green ammonia(GA)process showed that CTGAN achieved high performance and good explainability.
