Cu/SiO2 catalysts prepared by a convenient and efficient method using the urea hydrolysis deposition-precipitation （UHDP） technique have been proposed focusing on the effect of copper loading.The texture,structure a...Cu/SiO2 catalysts prepared by a convenient and efficient method using the urea hydrolysis deposition-precipitation （UHDP） technique have been proposed focusing on the effect of copper loading.The texture,structure and composition are systematically characterized by ICP,FTIR,N 2-physisorption,N2O chemisorption,TPR,XRD and XPS.The formation of copper phyllosilicate is observed in Cu/SiO2 catalyst by adopting UHDP method,and the amount of copper phyllosilicate is related to copper loading.It is found the structure properties and catalytic performance is profoundly affected by the amount of copper phyllosilicate.The excellent catalytic activity is attributed to the synergetic effect between Cu0 and Cu ＋.DMO conversion and EG selectivity are determined by the amount of Cu0 and Cu＋,respectively.The proper copper loading （30 wt%） provides with the highest ratio of Cu ＋ /Cu0,giving rise to the highest EG yield of 95% under the reaction conditions of p=2.0 MPa,T=473 K,H2/DMO=80 and LHSV=1.0h-1.展开更多
An actively water-cooled limiter has been designed for the long pulse operation of an HT-7 device, by adopting an integrated structure-doped graphite and a copper alloy heat sink with a super carbon sheet serving as a...An actively water-cooled limiter has been designed for the long pulse operation of an HT-7 device, by adopting an integrated structure-doped graphite and a copper alloy heat sink with a super carbon sheet serving as a compliant layer between them. The behaviors of the integrated structure were evaluated in an electron beam facility under different heat loads and cooling conditions. The surface temperature and bulk temperature distribution were carefully measured by optical pyrometers and thermocouples under a steady state heat flux of 1 to 5 MW/m^2 and a water flow rate of 3 m^3/h, 4.5 m^3/h and 6 m^3/h, respectively. It was found that the surface temperature increased rapidly with the heat flux rising, but decreased only slightly with the water flow rate rising. The surface temperature reached approximately 1200℃ at 5 MW/m^2 of heat flux and 6 m^3/h of water flow. The primary experimental results indicate that the integrated design meets the requirements for the heat expelling capacity of the HT-7 device. A set of numerical simulations was also completed, whose outcome was in good accord with the experimental results.展开更多
Recently a research team at Ohio University,USA,conducted a unique full-scale feld load test to simulate the aeration pipe installations at a copper extraction mine operated in Chile.The overliner material taken from ...Recently a research team at Ohio University,USA,conducted a unique full-scale feld load test to simulate the aeration pipe installations at a copper extraction mine operated in Chile.The overliner material taken from the mine was used in recreating the in situ conditions.Electric heaters were utilized to raise the temperature inside each pipe to simulate the essential element of the copper extraction process.The maximum vertical deflection reached by the test pipes was close to 20%,when the simulated heap pile height was 80 m.The plastic pipes and the overliner material were also tested in the laboratory.Based on the results,the maximum heap pile fll depth was recommended for the aeration system.The results indicated that the vertical deflection was the primary performance index for the aeration pipes installed in heap piles at mines.Lastly,the pipe made of polypropylene resin was super.展开更多
A functionally graded material-based actively water-cooled tungsten-copper mockup with a dimension of 30 mm×30 mm×25 mm was designed and fabricated by infiltration-brazing method.The thicknesses of the pure ...A functionally graded material-based actively water-cooled tungsten-copper mockup with a dimension of 30 mm×30 mm×25 mm was designed and fabricated by infiltration-brazing method.The thicknesses of the pure W layer and W/Cu graded layer were 2 and 3 mm,respectively.High heat flux tests were performed on the mockup using an e-beam device.There is no damage occurring on the joint after heat loading at 5 MW/m2.The temperature on the pure W surface is less than 500°C after irradiation for 100 s at 5 MW/m2,while the temperature on the brazing seam/copper surface is around 200°C.展开更多
Objective To investigate whether curcumin can regulate mitochondrial apoptosis pathway to alleviate liver fibrosis in copper-loaded rats with Wilson disease.Methods Thirty Wistar rats were randomly divided into the no...Objective To investigate whether curcumin can regulate mitochondrial apoptosis pathway to alleviate liver fibrosis in copper-loaded rats with Wilson disease.Methods Thirty Wistar rats were randomly divided into the normal,model,curcumin middle-dose and high-dose groups.展开更多
The ballistic properties of a low solid loading composite solid propellant family （Butalites） was studied experimentally by using propellant formulations based on hydroxy-terminated polybutadiene pre-polymer （HTPB...The ballistic properties of a low solid loading composite solid propellant family （Butalites） was studied experimentally by using propellant formulations based on hydroxy-terminated polybutadiene pre-polymer （HTPB） as fuel binder main backbone, mono and bi-modal system ammonium perchlorate oxidizer （AP）, copper chromite （CC） as burning rate accelerator and aluminum powder （A1） as metallic fuel. Higher pressures and AP contents as well as smaller AP particle size were found to increase burning rate. The same behavior verified with AI and CC addition. A significant increase of burning rate was recorded when CC added to the aluminized formulations compared with the non-aluminized of the same oxidizer solid loading and particle size.展开更多
目的:观察肝豆状核变性(WD)铜负荷模型大鼠肠道菌群特征,探索肝豆扶木汤改善WD铜负荷模型大鼠肝纤维化的可能微生物机制,为中医有效方药的应用提供证据支持。方法:选取2月龄SD大鼠随机分为模型组、青霉胺组(0.13 g/kg)、肝豆扶木汤低剂...目的:观察肝豆状核变性(WD)铜负荷模型大鼠肠道菌群特征,探索肝豆扶木汤改善WD铜负荷模型大鼠肝纤维化的可能微生物机制,为中医有效方药的应用提供证据支持。方法:选取2月龄SD大鼠随机分为模型组、青霉胺组(0.13 g/kg)、肝豆扶木汤低剂量组(13 m L/kg)、肝豆扶木汤中剂量组(26 m L/kg)、肝豆扶木汤高剂量组(52 m L/kg),另设空白组,每组10只;应用硫酸铜负荷饮食法[含硫酸铜(1 g/kg)饲料和硫酸铜(0.185%)水溶液]建立WD铜负荷大鼠模型;HE染色进行肝脏组织病理学观察;原子吸收分光光度法检测血清、脑组织Cu~(2+)含量;于治疗第7、14、28天每组随机收集3只模型大鼠的粪便样本行16S r DNA测序。结果:各组WD铜负荷模型大鼠的肠道菌群存在差异。与空白组比较,其余各组Corynebacterium菌属的相对丰度显著升高(P<0.05),Lactobacillus菌属相对丰度显著下降(P<0.05),肝豆扶木汤高剂量组较模型组、青霉胺组及肝豆扶木汤低、中剂量组Corynebacterium菌属相对丰度显著升高(P<0.05);与模型组、青霉胺组比较,肝豆扶木汤中、高剂量组Ligilactobacillus菌属相对丰度显著升高(P<0.05);与空白组比较,青霉胺组及肝豆扶木汤中、高剂量组Akkermansia菌属的相对丰度显著下降(P<0.05)。青霉胺组及肝豆扶木汤低、中、高剂量组较模型组的微生物网络复杂性、网络连接度、路径长度和聚类系数明显升高,以肝豆扶木汤中剂量组为著。结论:WD铜负荷大鼠模型存在肠道微生物群落失衡,随着排铜治疗的启动,其肠道微生物群落存在特征性表现;肝豆扶木汤可能通过调节肠道菌群的方式改善WD铜负荷大鼠模型肝纤维化进程。展开更多
In this study,non-thermal plasma(NTP)was employed to modify the Cu/TiO_(2)adsorbent to efficiently purify H_(2)S in low-temperature and micro-oxygen environments.The effects of Cu loading amounts and atmospheres of NT...In this study,non-thermal plasma(NTP)was employed to modify the Cu/TiO_(2)adsorbent to efficiently purify H_(2)S in low-temperature and micro-oxygen environments.The effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were investigated.The NTP modification successfully boosted the H_(2)S removal capacity to varying degrees,and the optimized adsorbent treated by air plasma(Cu/TiO_(2)-Air)attained the best H_(2)S breakthrough capacity of 113.29 mg H_(2)S/gadsorbent,which was almost 5 times higher than that of the adsorbent without NTP modification.Further studies demonstrated that the superior performance of Cu/TiO_(2)-Air was attributed to increased mesoporous volume,more exposure of active sites(CuO)and functional groups(amino groups and hydroxyl groups),enhanced Ti-O-Cu interaction,and the favorable ratio of active oxygen species.Additionally,the X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)results indicated the main reason for the deactivationwas the consumption of the active components(CuO)and the agglomeration of reaction products(CuS and SO_(4)^(2−))occupying the active sites on the surface and the inner pores of the adsorbents.展开更多
文摘Cu/SiO2 catalysts prepared by a convenient and efficient method using the urea hydrolysis deposition-precipitation （UHDP） technique have been proposed focusing on the effect of copper loading.The texture,structure and composition are systematically characterized by ICP,FTIR,N 2-physisorption,N2O chemisorption,TPR,XRD and XPS.The formation of copper phyllosilicate is observed in Cu/SiO2 catalyst by adopting UHDP method,and the amount of copper phyllosilicate is related to copper loading.It is found the structure properties and catalytic performance is profoundly affected by the amount of copper phyllosilicate.The excellent catalytic activity is attributed to the synergetic effect between Cu0 and Cu ＋.DMO conversion and EG selectivity are determined by the amount of Cu0 and Cu＋,respectively.The proper copper loading （30 wt%） provides with the highest ratio of Cu ＋ /Cu0,giving rise to the highest EG yield of 95% under the reaction conditions of p=2.0 MPa,T=473 K,H2/DMO=80 and LHSV=1.0h-1.
基金The project partially supported by National Natural Science Foundation of China (No. 10275069)
文摘An actively water-cooled limiter has been designed for the long pulse operation of an HT-7 device, by adopting an integrated structure-doped graphite and a copper alloy heat sink with a super carbon sheet serving as a compliant layer between them. The behaviors of the integrated structure were evaluated in an electron beam facility under different heat loads and cooling conditions. The surface temperature and bulk temperature distribution were carefully measured by optical pyrometers and thermocouples under a steady state heat flux of 1 to 5 MW/m^2 and a water flow rate of 3 m^3/h, 4.5 m^3/h and 6 m^3/h, respectively. It was found that the surface temperature increased rapidly with the heat flux rising, but decreased only slightly with the water flow rate rising. The surface temperature reached approximately 1200℃ at 5 MW/m^2 of heat flux and 6 m^3/h of water flow. The primary experimental results indicate that the integrated design meets the requirements for the heat expelling capacity of the HT-7 device. A set of numerical simulations was also completed, whose outcome was in good accord with the experimental results.
文摘Recently a research team at Ohio University,USA,conducted a unique full-scale feld load test to simulate the aeration pipe installations at a copper extraction mine operated in Chile.The overliner material taken from the mine was used in recreating the in situ conditions.Electric heaters were utilized to raise the temperature inside each pipe to simulate the essential element of the copper extraction process.The maximum vertical deflection reached by the test pipes was close to 20%,when the simulated heap pile height was 80 m.The plastic pipes and the overliner material were also tested in the laboratory.Based on the results,the maximum heap pile fll depth was recommended for the aeration system.The results indicated that the vertical deflection was the primary performance index for the aeration pipes installed in heap piles at mines.Lastly,the pipe made of polypropylene resin was super.
基金supported by the National Natural Science Foundation of China (No.10805073)the National Magnetic Confinement Fusion Program of China (No.2010GB109000)
文摘A functionally graded material-based actively water-cooled tungsten-copper mockup with a dimension of 30 mm×30 mm×25 mm was designed and fabricated by infiltration-brazing method.The thicknesses of the pure W layer and W/Cu graded layer were 2 and 3 mm,respectively.High heat flux tests were performed on the mockup using an e-beam device.There is no damage occurring on the joint after heat loading at 5 MW/m2.The temperature on the pure W surface is less than 500°C after irradiation for 100 s at 5 MW/m2,while the temperature on the brazing seam/copper surface is around 200°C.
文摘Objective To investigate whether curcumin can regulate mitochondrial apoptosis pathway to alleviate liver fibrosis in copper-loaded rats with Wilson disease.Methods Thirty Wistar rats were randomly divided into the normal,model,curcumin middle-dose and high-dose groups.
文摘The ballistic properties of a low solid loading composite solid propellant family （Butalites） was studied experimentally by using propellant formulations based on hydroxy-terminated polybutadiene pre-polymer （HTPB） as fuel binder main backbone, mono and bi-modal system ammonium perchlorate oxidizer （AP）, copper chromite （CC） as burning rate accelerator and aluminum powder （A1） as metallic fuel. Higher pressures and AP contents as well as smaller AP particle size were found to increase burning rate. The same behavior verified with AI and CC addition. A significant increase of burning rate was recorded when CC added to the aluminized formulations compared with the non-aluminized of the same oxidizer solid loading and particle size.
文摘目的:观察肝豆状核变性(WD)铜负荷模型大鼠肠道菌群特征,探索肝豆扶木汤改善WD铜负荷模型大鼠肝纤维化的可能微生物机制,为中医有效方药的应用提供证据支持。方法:选取2月龄SD大鼠随机分为模型组、青霉胺组(0.13 g/kg)、肝豆扶木汤低剂量组(13 m L/kg)、肝豆扶木汤中剂量组(26 m L/kg)、肝豆扶木汤高剂量组(52 m L/kg),另设空白组,每组10只;应用硫酸铜负荷饮食法[含硫酸铜(1 g/kg)饲料和硫酸铜(0.185%)水溶液]建立WD铜负荷大鼠模型;HE染色进行肝脏组织病理学观察;原子吸收分光光度法检测血清、脑组织Cu~(2+)含量;于治疗第7、14、28天每组随机收集3只模型大鼠的粪便样本行16S r DNA测序。结果:各组WD铜负荷模型大鼠的肠道菌群存在差异。与空白组比较,其余各组Corynebacterium菌属的相对丰度显著升高(P<0.05),Lactobacillus菌属相对丰度显著下降(P<0.05),肝豆扶木汤高剂量组较模型组、青霉胺组及肝豆扶木汤低、中剂量组Corynebacterium菌属相对丰度显著升高(P<0.05);与模型组、青霉胺组比较,肝豆扶木汤中、高剂量组Ligilactobacillus菌属相对丰度显著升高(P<0.05);与空白组比较,青霉胺组及肝豆扶木汤中、高剂量组Akkermansia菌属的相对丰度显著下降(P<0.05)。青霉胺组及肝豆扶木汤低、中、高剂量组较模型组的微生物网络复杂性、网络连接度、路径长度和聚类系数明显升高,以肝豆扶木汤中剂量组为著。结论:WD铜负荷大鼠模型存在肠道微生物群落失衡,随着排铜治疗的启动,其肠道微生物群落存在特征性表现;肝豆扶木汤可能通过调节肠道菌群的方式改善WD铜负荷大鼠模型肝纤维化进程。
基金supported by the National Natural Science Foundation of China (Nos.52260013,51968034,and 21876071)the Yunnan Major Scientific and Technological Projects (No.202202AG050005).
文摘In this study,non-thermal plasma(NTP)was employed to modify the Cu/TiO_(2)adsorbent to efficiently purify H_(2)S in low-temperature and micro-oxygen environments.The effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were investigated.The NTP modification successfully boosted the H_(2)S removal capacity to varying degrees,and the optimized adsorbent treated by air plasma(Cu/TiO_(2)-Air)attained the best H_(2)S breakthrough capacity of 113.29 mg H_(2)S/gadsorbent,which was almost 5 times higher than that of the adsorbent without NTP modification.Further studies demonstrated that the superior performance of Cu/TiO_(2)-Air was attributed to increased mesoporous volume,more exposure of active sites(CuO)and functional groups(amino groups and hydroxyl groups),enhanced Ti-O-Cu interaction,and the favorable ratio of active oxygen species.Additionally,the X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)results indicated the main reason for the deactivationwas the consumption of the active components(CuO)and the agglomeration of reaction products(CuS and SO_(4)^(2−))occupying the active sites on the surface and the inner pores of the adsorbents.
