Investigation was carried out of the crack growth rate in weld metal and heat affected zone (HAZ)of offshore structural steels,homemade steel 36Z together with foreign steel A537 of similar strength grade by compariso...Investigation was carried out of the crack growth rate in weld metal and heat affected zone (HAZ)of offshore structural steels,homemade steel 36Z together with foreign steel A537 of similar strength grade by comparison,in artificial sea water undergone fatigue with different frequencies.The crack growth rate in weld metal and HAZ of steel 36Z fatigued at low fre- queney may be 3—5 and 4—10 times as high as that at high frequency respectivley.The crack growth rate for steel 36Z may fairly match that of A537,The crack growth model and frac- ture of weld metal in corrosive medium were also discussed.展开更多
Objective:To explore the differences in the central response after acupuncture and moxibusbution at Zusanli(足三里ST36) in treatment of functional dyspepsia(FD) based on the analysis of fractional amplitude of low fre...Objective:To explore the differences in the central response after acupuncture and moxibusbution at Zusanli(足三里ST36) in treatment of functional dyspepsia(FD) based on the analysis of fractional amplitude of low frequency fluctuation(fALFF) of resting-state functional magnetic resonance imaging(rfMRI).Methods:A total of 60 patients with FD were randomized into an acupuncture group and a moxibustion group,30 cases in each one.In the acupuncture group,acupuncture was applied to bilateral ST36.In the moxibustion group,moxibustion was exerted at bilateral ST36.The treatment was given once a day,5 times a week,totally for 4 weeks in each group,including 20 treatments with acupuncture or moxibustion.Separately,before and at the end of treatment,rfMRI scanning was conducted in two groups.Using data processing assistant for resting-state fMRI(DPARSF) software and MATLAB data platform,rfMRI data were collected for preprocessing and fALFF analysis.Results:Compared with the data before treatment,after treated with acupuncture at ST36 in FD patients,fALFF value was reduced in the right superior frontal gyrus,left superior frontal gyrus,left inferior frontal gyrus,right cuneus,left precuneus,right middle occipital gyrus,left middle occipital gyrus,etc.,and it was increased in the left parahippocampus,right parahippocampus,left cerebellum,etc(all P <0.01).After treated with moxibustion,the remarkable increase of fALFF was not discovered in brain areas,but fALFF decreased significantly in the left superior parietal gyrus(P <0.01).Compared with moxibustion at ST36,after acupuncture at ST36 in FD patients,the increase of fALFF appeared in the right putamen and the decrease of it occurred in the middle occipital gyrus,indicating the statistical significance(both P <0.05).Conclusion:The differences in central function responses are induced in treamtent with acupuncture and moxibustion,which is probably related to the resting-state default network associated with targeted regulation and ventral attention of brain areas in functional dyspepsia.展开更多
With narrow red photoluminescence (PL) bands, tetravalent Mn^(4+) doped phosphors show promising prospect in commercial application to effectively expand color gamut of phosphor converted LED displays. Here, we report...With narrow red photoluminescence (PL) bands, tetravalent Mn^(4+) doped phosphors show promising prospect in commercial application to effectively expand color gamut of phosphor converted LED displays. Here, we report a type of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) phosphors with regular cage-like micro-spherical morphologies. The micron size spherical precursors were synthesized with a propylene oxide (PO) driven fast sol–gel method. The cage -like spherical morphology is beneficial to efficiently trapping much incident light to enhance the PL of the phosphors. Being calcined at 1300 ℃, Sr_(2)MgAl_(21.978)O_(36):0.022Mn^(4+) only exhibits the internal quantum efficiency (IQE) of 24.91%. With the Mg^(2+)-Mn^(4+) codoping and Y^(3+)/Sr^(2+) substituting strategies, to fulfill charge balance and produce John-Teller distortion, IQE of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) can be further improved up to 36.45%. The CIE color coordinates of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) under near ultraviolet excitation can be stably fixed to (0.723, 0.227) at deep red region. It thus finds a potential application as pc-LED display with much broader color gamut than that of the NTSC standard. Therefore, Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) micron size spheres can be employed as promising red phosphors for high performance LED displays.展开更多
Objective:To explore the difference in the anti-fatigue effect of moxibustion at different acupoints through observing the impacts of moxibustion at"Shènshù(肾俞BL23)","Zúsānlǐ(足三里ST...Objective:To explore the difference in the anti-fatigue effect of moxibustion at different acupoints through observing the impacts of moxibustion at"Shènshù(肾俞BL23)","Zúsānlǐ(足三里ST36)","Guānyuán(关元CV4)"and"Shénquè(神阙CV8)"on energy metabolic indexes in the one-off exhausted rats.Methods:A total of 56 SPF male rats were randomized into 7 groups,named a blank group,a model group,a non-acupoint group,a"BL23"group,a"ST36"group,a"CV4"group and a"CV8"group,8 rats in each group.The one-off exhaustion model was established by weight-bearing swimming experiment.Right after the exhaustive swimming of rats in each intervention group,the mild moxibustion was applied at the corresponding acupoints for 15 min immediately.4 h after the exhaustive swimming,the blood was collected from the femoral artery and the quadriceps femoris of the left hindlimb was stripped.The levels of blood lactate(BLD),lactate dehydrogenase(LDH),creatine kinase(CK)and blood urea nitrogen(BUN),the expressions of adenosine triphosphatease(ATP),fructose-6-phosphofructokinase(PFK)and malomdialdehyde(MDA)in the quadriceps femoris and the activity of superoxide dismutase(SOD)and catalase(CAT)were detected.Results:Compared with the model group and the non-acupoint group,the levels of serum BLD,LDH,CK and BUN were all lower those in the"BL23"group,the"ST36"group,the"CV4"group and the"CV8"group,indicating a statistical significance(all P<0.05).Compared with the model group and the nonacupoint group,PFK was higher in the"BL23"group,indicating a statistical significance(both P<0.05).Compared with the model group and the non-acupoint group,PFK was higher in the"ST36"group and the"CV4"group,indicating a statistical significance(all P<0.05).Conclusion:It was found in the research that moxibustion at"BL23""ST36""CV4"and"CV8"regulated the energy metabolism in the one-off exhausted rats so as to bring the anti-fatigue effect into play and the effect was different among the acupoints.Moxibustion at"CV8"may work on the prevention of the protein decomposition in the skeletal muscle and moxibustion at"BL23"may be against the oxidation in the skeletal muscle.展开更多
文摘Investigation was carried out of the crack growth rate in weld metal and heat affected zone (HAZ)of offshore structural steels,homemade steel 36Z together with foreign steel A537 of similar strength grade by comparison,in artificial sea water undergone fatigue with different frequencies.The crack growth rate in weld metal and HAZ of steel 36Z fatigued at low fre- queney may be 3—5 and 4—10 times as high as that at high frequency respectivley.The crack growth rate for steel 36Z may fairly match that of A537,The crack growth model and frac- ture of weld metal in corrosive medium were also discussed.
基金Supported by Changsha Outstanding Innovation Youth Training Project:kq1905036Open Fund Project of First-Class Discipline in Traditional Chinese Medicine of Hunan University of Chinese Medicine:2018ZYX04。
文摘Objective:To explore the differences in the central response after acupuncture and moxibusbution at Zusanli(足三里ST36) in treatment of functional dyspepsia(FD) based on the analysis of fractional amplitude of low frequency fluctuation(fALFF) of resting-state functional magnetic resonance imaging(rfMRI).Methods:A total of 60 patients with FD were randomized into an acupuncture group and a moxibustion group,30 cases in each one.In the acupuncture group,acupuncture was applied to bilateral ST36.In the moxibustion group,moxibustion was exerted at bilateral ST36.The treatment was given once a day,5 times a week,totally for 4 weeks in each group,including 20 treatments with acupuncture or moxibustion.Separately,before and at the end of treatment,rfMRI scanning was conducted in two groups.Using data processing assistant for resting-state fMRI(DPARSF) software and MATLAB data platform,rfMRI data were collected for preprocessing and fALFF analysis.Results:Compared with the data before treatment,after treated with acupuncture at ST36 in FD patients,fALFF value was reduced in the right superior frontal gyrus,left superior frontal gyrus,left inferior frontal gyrus,right cuneus,left precuneus,right middle occipital gyrus,left middle occipital gyrus,etc.,and it was increased in the left parahippocampus,right parahippocampus,left cerebellum,etc(all P <0.01).After treated with moxibustion,the remarkable increase of fALFF was not discovered in brain areas,but fALFF decreased significantly in the left superior parietal gyrus(P <0.01).Compared with moxibustion at ST36,after acupuncture at ST36 in FD patients,the increase of fALFF appeared in the right putamen and the decrease of it occurred in the middle occipital gyrus,indicating the statistical significance(both P <0.05).Conclusion:The differences in central function responses are induced in treamtent with acupuncture and moxibustion,which is probably related to the resting-state default network associated with targeted regulation and ventral attention of brain areas in functional dyspepsia.
基金Project supported by the National Natural Science Foundation of China (51872255,51672243)。
文摘With narrow red photoluminescence (PL) bands, tetravalent Mn^(4+) doped phosphors show promising prospect in commercial application to effectively expand color gamut of phosphor converted LED displays. Here, we report a type of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) phosphors with regular cage-like micro-spherical morphologies. The micron size spherical precursors were synthesized with a propylene oxide (PO) driven fast sol–gel method. The cage -like spherical morphology is beneficial to efficiently trapping much incident light to enhance the PL of the phosphors. Being calcined at 1300 ℃, Sr_(2)MgAl_(21.978)O_(36):0.022Mn^(4+) only exhibits the internal quantum efficiency (IQE) of 24.91%. With the Mg^(2+)-Mn^(4+) codoping and Y^(3+)/Sr^(2+) substituting strategies, to fulfill charge balance and produce John-Teller distortion, IQE of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) can be further improved up to 36.45%. The CIE color coordinates of Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) under near ultraviolet excitation can be stably fixed to (0.723, 0.227) at deep red region. It thus finds a potential application as pc-LED display with much broader color gamut than that of the NTSC standard. Therefore, Sr_(2-z)Mg_(1+y)Y_(z)Al_(22-x)O_(36):xMn^(4+) micron size spheres can be employed as promising red phosphors for high performance LED displays.
基金Supported by Key Research Projects of Higher Education in Hebei Province:ZD2019061
文摘Objective:To explore the difference in the anti-fatigue effect of moxibustion at different acupoints through observing the impacts of moxibustion at"Shènshù(肾俞BL23)","Zúsānlǐ(足三里ST36)","Guānyuán(关元CV4)"and"Shénquè(神阙CV8)"on energy metabolic indexes in the one-off exhausted rats.Methods:A total of 56 SPF male rats were randomized into 7 groups,named a blank group,a model group,a non-acupoint group,a"BL23"group,a"ST36"group,a"CV4"group and a"CV8"group,8 rats in each group.The one-off exhaustion model was established by weight-bearing swimming experiment.Right after the exhaustive swimming of rats in each intervention group,the mild moxibustion was applied at the corresponding acupoints for 15 min immediately.4 h after the exhaustive swimming,the blood was collected from the femoral artery and the quadriceps femoris of the left hindlimb was stripped.The levels of blood lactate(BLD),lactate dehydrogenase(LDH),creatine kinase(CK)and blood urea nitrogen(BUN),the expressions of adenosine triphosphatease(ATP),fructose-6-phosphofructokinase(PFK)and malomdialdehyde(MDA)in the quadriceps femoris and the activity of superoxide dismutase(SOD)and catalase(CAT)were detected.Results:Compared with the model group and the non-acupoint group,the levels of serum BLD,LDH,CK and BUN were all lower those in the"BL23"group,the"ST36"group,the"CV4"group and the"CV8"group,indicating a statistical significance(all P<0.05).Compared with the model group and the nonacupoint group,PFK was higher in the"BL23"group,indicating a statistical significance(both P<0.05).Compared with the model group and the non-acupoint group,PFK was higher in the"ST36"group and the"CV4"group,indicating a statistical significance(all P<0.05).Conclusion:It was found in the research that moxibustion at"BL23""ST36""CV4"and"CV8"regulated the energy metabolism in the one-off exhausted rats so as to bring the anti-fatigue effect into play and the effect was different among the acupoints.Moxibustion at"CV8"may work on the prevention of the protein decomposition in the skeletal muscle and moxibustion at"BL23"may be against the oxidation in the skeletal muscle.
