A series of Mn-promoted 15 wt-% Ni/Al2O3 catalysts were prepared by an incipient wetness impreg- nation method. The effect of the Mn content on the activity of the Ni/Al2O3 catalysts for CO2 methanation and the co- me...A series of Mn-promoted 15 wt-% Ni/Al2O3 catalysts were prepared by an incipient wetness impreg- nation method. The effect of the Mn content on the activity of the Ni/Al2O3 catalysts for CO2 methanation and the co- methanation of CO and CO2 in a fixed-bed reactor was investigated. The catalysts were characterized by N2 physisorption, hydrogen temperature-programmed reduc- tion and desorption, carbon dioxide temperature-pro- grammed desorption, X-ray diffraction and high- resolution transmission electron microscopy. The presence of Mn increased the number of CO2 adsorption sites and inhibited Ni particle agglomeration due to improved Ni dispersion and weakened interactions between the nickel species and the support. The Mn-promoted 15 wt-% Ni/ Al2O3 catalysts had improved CO2 methanation activity especially at low temperatures （250 to 400 ℃）. The Mn content was varied from 0.86% to 2.54% and the best CO2 conversion was achieved with the 1.71Mn-Ni/Al2O3 catalyst. The co-methanation tests on the 1.71Mn-Ni/ Al2O3 catalyst indicated that adding Mn markedly enhanced the CO2 methanation activity especially at low temperatures but it had little influence on the CO methanation performance. CO2 methanation was more sensitive to the reaction temperature and the space velocity than the CO methanation in the co-methanation process.展开更多
The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that on...The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO2/Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO2/Cu as photocatalysts is approxi- mately 68 times higher than that obtained with only TiO2.展开更多
In a previous article, we reported tho syntheses of some bioactive polyacryloc esters and the coupling of trypsin or serum protein onto polyaerylie esters by the active ester method of N-hydroxy compounds. We have obs...In a previous article, we reported tho syntheses of some bioactive polyacryloc esters and the coupling of trypsin or serum protein onto polyaerylie esters by the active ester method of N-hydroxy compounds. We have observed that a hydrophobic and rigid benzene ring as a spacing group between the main chain and the protein seems to be a dominant factor for the high biologieal activity of the immobilized enzyme. Poly (N-p-methaeryloxybenzoloxy-5-norbornene-2, 3-diearboxhnide)-trypsin [P (MBONB)-try-psin] matrix exhibited a bioactivity around three times that of the poly (N-metha-展开更多
Inner Mongolia Sanwei ResourcesGroup Co.,Ltd.and Hong Kong JBGroup signed an agreement on the co-operation in a 1.2 million t/a methanolproject in Inner Mongolia on July 25.Wushen Banner of Inner Mongolia an-nounced o...Inner Mongolia Sanwei ResourcesGroup Co.,Ltd.and Hong Kong JBGroup signed an agreement on the co-operation in a 1.2 million t/a methanolproject in Inner Mongolia on July 25.Wushen Banner of Inner Mongolia an-nounced only in April this year that itwill construct a 1.0 million t/a metha-展开更多
Henan Longyu Coal Chemical Company Limited,un-der Yongcheng Coal and Electric Power Group Corporation,has put into operation of a new metha-nol facility in Yongcheng of Henan province.
China Development Bank Shaanxi Branch andShaanxi Provincial Investment Group Co.,Ltd.signed a loan contract in Xi’an on September 20th.In the next three years,China Development BankShaanxi Branch will issue a loan to...China Development Bank Shaanxi Branch andShaanxi Provincial Investment Group Co.,Ltd.signed a loan contract in Xi’an on September 20th.In the next three years,China Development BankShaanxi Branch will issue a loan totaling RMB1.展开更多
Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabol...Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabolites and perchloric acid was used to extract water-soluble metabolites. Fur- thermore, a dual phase extraction method using methanol-chloroform and water was used to obtain both water and lipid fractions simultaneously. All metabolite extractions were analyzed on a 9.4T high-resolution nuclear magnetic resonance spectrometer. Metabolite resonance peaks were as- signed in the acquired spectra according to the chemical shift, and the extraction efficiency of dif- ferent methods was compared. Results showed that in the spectra of water-soluble extracts, major metabolites comprised low molecular weight metabolites, including lactate, acetic acid, fatty acids, threonine, glutamic acid, creatine, choline and its derivatives, while in the spectra of lipid-soluble extracts, most metabolites were assigned to fatty acids. Among the different extraction procedures, perchloric acid was more efficient in extracting water-soluble metabolites and methanol-chloroform was efficient in extracting organic components compared with the dual phase extraction method. Nuclear magnetic resonance spectroscopy showed that as low as 0.7 mg organic yield was enough to obtain clear resonance peaks, while about 6.0 mg water-soluble yield was needed to obtain rela- tively favorable spectral lines. These results show that the efficiency of extracting water and lipid fractions is higher using perchloric acid and methanol-chloroform compared with dual phase ex- traction and that nuclear magnetic resonance spectroscopy is highly sensitive for analyzing lipid-soluble extracts.展开更多
The new 75 kt/a BDO constructed at Sanwei Group in Shanxi province has adopted the technology for hydrogenation of maleic anhydride to manufacture BDO licensed by the British Davy Process Technology(DOT) Company It is...The new 75 kt/a BDO constructed at Sanwei Group in Shanxi province has adopted the technology for hydrogenation of maleic anhydride to manufacture BDO licensed by the British Davy Process Technology(DOT) Company It is learned that this catalytic technique is the fourth generation technology (Mark 4b) that is the latest catalyst system at present time.This technology uses maleic anhydride,hydrogen展开更多
BACKGROUND Subsidence is one of the concerning early complications in cementless femoral stem.Few publications have studied the influencing factors for subsidence in short cementless stems,due to their metaphyseal anc...BACKGROUND Subsidence is one of the concerning early complications in cementless femoral stem.Few publications have studied the influencing factors for subsidence in short cementless stems,due to their metaphyseal anchoring without diaphyseal invasion,they might demonstrate different subsidence patterns than with the conventional stems.AIM To analyze the factors associated with significant subsidence in short stems,including any radiographic parameters.METHODS The digitized radiographs of 274 consecutive short stem total hip arthroplasties were retrospectively reviewed.Subsidence,neck-filling ratio(NFR),seating height and lateral stem contact were evaluated after a minimum of two years follow-up.A threshold of subsidence>3 mm was considered a clinically significant migration.RESULTS For the entire cohort,subsidence occurred in 75 cases(27.4%)with the mean stem subsidence of 0.5 mm.(0-12.7,1.68).Twelve hips(4.4%)had significant subsidence(>3 mm).The univariate regression analysis demonstrated that age,diagnosis,BMI,Dorr’s type B,NFR,and seating height had no significant influence on significant subsidence,whereas insufficient lateral stem contact(≥1 mm)did have a statistically significant influence[Odds ratio(OR)=5.02;95%CI:1.3-18.9;P=0.017].The multivariate regression analysis also demonstrated that insufficient lateral stem contact was a statistically significant influencing factor(OR=5.5;95%CI:1.4-21.4;P=0.014).There was no femoral stem revision for aseptic loosening in our cohort.CONCLUSION This study demonstrated that insufficient lateral stem contact was a statistically significant influencing factor on significant subsidence.Therefore,it is a particularly important step to create proper lateral cortical contact when performing the short stem total hip arthroplasty.展开更多
Ⅰ. INTRODUCTION The metal chelates of thiosemicarbazone have been observed to be pharmacologically active against virous protozoa, small pox and certain kinds of tumors, and we have found that the chelates of the sul...Ⅰ. INTRODUCTION The metal chelates of thiosemicarbazone have been observed to be pharmacologically active against virous protozoa, small pox and certain kinds of tumors, and we have found that the chelates of the sulphur-containing schiff bases are an oxygen carrier, too. Some of the metal chelates of HPMBP (enolic form) have been shown that there is a shift reagent展开更多
文摘A series of Mn-promoted 15 wt-% Ni/Al2O3 catalysts were prepared by an incipient wetness impreg- nation method. The effect of the Mn content on the activity of the Ni/Al2O3 catalysts for CO2 methanation and the co- methanation of CO and CO2 in a fixed-bed reactor was investigated. The catalysts were characterized by N2 physisorption, hydrogen temperature-programmed reduc- tion and desorption, carbon dioxide temperature-pro- grammed desorption, X-ray diffraction and high- resolution transmission electron microscopy. The presence of Mn increased the number of CO2 adsorption sites and inhibited Ni particle agglomeration due to improved Ni dispersion and weakened interactions between the nickel species and the support. The Mn-promoted 15 wt-% Ni/ Al2O3 catalysts had improved CO2 methanation activity especially at low temperatures （250 to 400 ℃）. The Mn content was varied from 0.86% to 2.54% and the best CO2 conversion was achieved with the 1.71Mn-Ni/Al2O3 catalyst. The co-methanation tests on the 1.71Mn-Ni/ Al2O3 catalyst indicated that adding Mn markedly enhanced the CO2 methanation activity especially at low temperatures but it had little influence on the CO methanation performance. CO2 methanation was more sensitive to the reaction temperature and the space velocity than the CO methanation in the co-methanation process.
文摘The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO2/Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO2/Cu as photocatalysts is approxi- mately 68 times higher than that obtained with only TiO2.
文摘In a previous article, we reported tho syntheses of some bioactive polyacryloc esters and the coupling of trypsin or serum protein onto polyaerylie esters by the active ester method of N-hydroxy compounds. We have observed that a hydrophobic and rigid benzene ring as a spacing group between the main chain and the protein seems to be a dominant factor for the high biologieal activity of the immobilized enzyme. Poly (N-p-methaeryloxybenzoloxy-5-norbornene-2, 3-diearboxhnide)-trypsin [P (MBONB)-try-psin] matrix exhibited a bioactivity around three times that of the poly (N-metha-
文摘Inner Mongolia Sanwei ResourcesGroup Co.,Ltd.and Hong Kong JBGroup signed an agreement on the co-operation in a 1.2 million t/a methanolproject in Inner Mongolia on July 25.Wushen Banner of Inner Mongolia an-nounced only in April this year that itwill construct a 1.0 million t/a metha-
文摘Henan Longyu Coal Chemical Company Limited,un-der Yongcheng Coal and Electric Power Group Corporation,has put into operation of a new metha-nol facility in Yongcheng of Henan province.
文摘China Development Bank Shaanxi Branch andShaanxi Provincial Investment Group Co.,Ltd.signed a loan contract in Xi’an on September 20th.In the next three years,China Development BankShaanxi Branch will issue a loan totaling RMB1.
基金supported by the Key Program of the National Natural Science Foundation of China,No.30930027the National Natural Science Foundation of China,No.60971075the Foundation for Basic and Clinical Medicine (2010) of Shantou University Medical College,China
文摘Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabolites and perchloric acid was used to extract water-soluble metabolites. Fur- thermore, a dual phase extraction method using methanol-chloroform and water was used to obtain both water and lipid fractions simultaneously. All metabolite extractions were analyzed on a 9.4T high-resolution nuclear magnetic resonance spectrometer. Metabolite resonance peaks were as- signed in the acquired spectra according to the chemical shift, and the extraction efficiency of dif- ferent methods was compared. Results showed that in the spectra of water-soluble extracts, major metabolites comprised low molecular weight metabolites, including lactate, acetic acid, fatty acids, threonine, glutamic acid, creatine, choline and its derivatives, while in the spectra of lipid-soluble extracts, most metabolites were assigned to fatty acids. Among the different extraction procedures, perchloric acid was more efficient in extracting water-soluble metabolites and methanol-chloroform was efficient in extracting organic components compared with the dual phase extraction method. Nuclear magnetic resonance spectroscopy showed that as low as 0.7 mg organic yield was enough to obtain clear resonance peaks, while about 6.0 mg water-soluble yield was needed to obtain rela- tively favorable spectral lines. These results show that the efficiency of extracting water and lipid fractions is higher using perchloric acid and methanol-chloroform compared with dual phase ex- traction and that nuclear magnetic resonance spectroscopy is highly sensitive for analyzing lipid-soluble extracts.
文摘The new 75 kt/a BDO constructed at Sanwei Group in Shanxi province has adopted the technology for hydrogenation of maleic anhydride to manufacture BDO licensed by the British Davy Process Technology(DOT) Company It is learned that this catalytic technique is the fourth generation technology (Mark 4b) that is the latest catalyst system at present time.This technology uses maleic anhydride,hydrogen
文摘BACKGROUND Subsidence is one of the concerning early complications in cementless femoral stem.Few publications have studied the influencing factors for subsidence in short cementless stems,due to their metaphyseal anchoring without diaphyseal invasion,they might demonstrate different subsidence patterns than with the conventional stems.AIM To analyze the factors associated with significant subsidence in short stems,including any radiographic parameters.METHODS The digitized radiographs of 274 consecutive short stem total hip arthroplasties were retrospectively reviewed.Subsidence,neck-filling ratio(NFR),seating height and lateral stem contact were evaluated after a minimum of two years follow-up.A threshold of subsidence>3 mm was considered a clinically significant migration.RESULTS For the entire cohort,subsidence occurred in 75 cases(27.4%)with the mean stem subsidence of 0.5 mm.(0-12.7,1.68).Twelve hips(4.4%)had significant subsidence(>3 mm).The univariate regression analysis demonstrated that age,diagnosis,BMI,Dorr’s type B,NFR,and seating height had no significant influence on significant subsidence,whereas insufficient lateral stem contact(≥1 mm)did have a statistically significant influence[Odds ratio(OR)=5.02;95%CI:1.3-18.9;P=0.017].The multivariate regression analysis also demonstrated that insufficient lateral stem contact was a statistically significant influencing factor(OR=5.5;95%CI:1.4-21.4;P=0.014).There was no femoral stem revision for aseptic loosening in our cohort.CONCLUSION This study demonstrated that insufficient lateral stem contact was a statistically significant influencing factor on significant subsidence.Therefore,it is a particularly important step to create proper lateral cortical contact when performing the short stem total hip arthroplasty.
文摘Ⅰ. INTRODUCTION The metal chelates of thiosemicarbazone have been observed to be pharmacologically active against virous protozoa, small pox and certain kinds of tumors, and we have found that the chelates of the sulphur-containing schiff bases are an oxygen carrier, too. Some of the metal chelates of HPMBP (enolic form) have been shown that there is a shift reagent
