Fibrous particulate precursor was obtained by precipitation transformation in the ternary solution system of ammonium oxalate, nickel chloride and ammonia. The composition and morphology of precursor were characterize...Fibrous particulate precursor was obtained by precipitation transformation in the ternary solution system of ammonium oxalate, nickel chloride and ammonia. The composition and morphology of precursor were characterized by XRD, SEM, IR and DTA/TGA analyses. The results show that the chemical composition and morphology of precursor precipitates at pH=8.4？8.8 are different from those of precursor precipitates at pH=6.0, and the mechanisms of the thermal decomposition of the precursors are different. The effects of various conditions in the process of thermal decomposition, including precursor morphology, atmosphere, temperature and time on the morphology and dispersion degree of obtained nickel powders were studied in detail. The final product inherits the morphology of precursor when the thermal decomposition is conducted under a weakly reducing atmosphere at temperature range of 400？440 °C for 30 min. Fibrous nickel powder can be produced with good dispersion, and its shape changes from smooth, straight and compact fiber into loose and curved fiber with rough surface.展开更多
In Na_2O–CaO–SiO_2–H_2O system,systematic investigations of phase and morphology of calcium silicate in hydrothermal conditions were concisely conducted for high-value utilization of silicon resource in high-alumin...In Na_2O–CaO–SiO_2–H_2O system,systematic investigations of phase and morphology of calcium silicate in hydrothermal conditions were concisely conducted for high-value utilization of silicon resource in high-alumina fly ash(HAFA).The results show that crystal composition and phase may be affected by relatively low concentration of NaOH,and sodium ions are rearranged into the structure to form NaCaHSiO_4 and Na_2Ca_3H_8Si_2O_(12) with different C/S ratio at high concentration of Na OH.In addition,phases in wollastonite group possess the morphology of nano fiber.Formation of nano fiber is attributed to the difference of surface energies between axial and radial direction,and higher temperatures lead to easier growth along radial direction.The preparation of C–S–H with different phases and morphologies can guide for the application of silicate solution with high alkalinity with different purposes.展开更多
Objective To optimize the therapeutic dosage of tetrandrine （Tet） in rat hepatic fibrosis roodel. Methods 50 Wistar rats were divided into 5 groups at random including normal control, model control, Tettreated model...Objective To optimize the therapeutic dosage of tetrandrine （Tet） in rat hepatic fibrosis roodel. Methods 50 Wistar rats were divided into 5 groups at random including normal control, model control, Tettreated model groups of 10mg· kg^ - 1· d^ - 1, 5mg· kg^ - 1· d^ - 1 and 2.5mg· kg^ - 1· d^ - 1（ n = 10 in each group ）. All rats, except for the normal controls, were injected with axenic porcine serum （0. 5ml each time, twice a week） intraperitoneally for 8 weeks to establish hepatic fibrosis. After the 8th week, rats of Tet-treated model groups were given by gavage once a day with different doses of Tet for another 8 weeks. Then the liver function, serum levels of hyaluronic acid （ HA ）, laminin （ LM）, and procollagen type Ⅲ （PCⅢ） were tested. Collagen type 1 and Ⅲ, pathological changes in liver tissue were also assessed. Results Most indices of liver function including alanine minotransferase （ALT）, aspartate aminotransferase （AST）, albumin （ ALB）, albumin/globulin ratio （ A/G） and alkaline phosphatase （ALP） improved significantly in Tet-treated groups with the exception of γ-glutamyl transpeptidase （γ- GT） and total bilirubin （TBIL）. Secondly, markedly lowered levels of HA, LM and collagen type I, III were also detected by radioimmunology and immunohistochemistry in the 5 mg· kg^ - 1· d^ - 1 Tet-treated model group. Moreover, pathologi- cal findings confirmed the statistically significant improvement in hepatofibrotic degree resulted from the treatment of 5mg· kg^ - 1· d^ - 1 rather than other doses of Tet. Conclusion For experimental Wistar rats, Tet exhibited an anti-hepatofibrotic action in doses within the range of 2.5mg· kg^ - 1· d^ - 1 to 10mg· kg^ - 1· d^ - 1 and 5mg· kg^ - 1· d^ - 1 may be the optimum one among all doses.展开更多
Food diversification is a way to strengthen national food security, for example by reducing the dependence on wheat flour as a main raw material of various food products through the use of cassava flour. Cassava flour...Food diversification is a way to strengthen national food security, for example by reducing the dependence on wheat flour as a main raw material of various food products through the use of cassava flour. Cassava flour, a rich source of carbohydrates, can be used in the making of flakes. In this study, the Virgin coconut oil （VCO） waste flour was added in cassava flour to produce gluten-free cassava flour flakes with high dietary fiber contents. The six different formulas of flakes were used in this study with addition of 0% （control）, 10%, 20%, 30%, 40% and 50% coconut waste flour, respectively. Then, the chemical and microbiological characteristics of the flakes were measured. Based on the proximate data, both flours have a good quality. The microbiological analysis shows cassava flour and coconut waste flour have good sanitation and food safety. Results showed that flakes with 80% cassava flour and 20% coconut waste flour are gluten-free and contain 2.52% water, 2.27% ash, 14.40% fat, 4.50% protein, 76.31% carbohydrate, 8.56% dietary fiber. Therefore, it can be said that cassava flour flakes can serve as gluten-free and rich dietary fiber ready-to-eat food.展开更多
Concrete, as an essential construction material in the construction industry, is the main component of solid waste. To improve the strength and durability of concrete, some additives can be added into concrete to repl...Concrete, as an essential construction material in the construction industry, is the main component of solid waste. To improve the strength and durability of concrete, some additives can be added into concrete to replace parts of cement. Carbon fiber and silica powder are the most common additives. Under a series of experiments, the effects of temperature, carbon fiber and silica powder on the mechanical properties of concrete were studied under normal circumstances. In this paper, a conclusion on the effects was drawn up mainly through some experimental analyses, so as to discuss the effect laws and provide a reference to manufacture the concrete of high strength and properties.展开更多
基金Project(2010FJ3012)supported by the Science and Technology Plan Foundation of Hunan Province,China
文摘Fibrous particulate precursor was obtained by precipitation transformation in the ternary solution system of ammonium oxalate, nickel chloride and ammonia. The composition and morphology of precursor were characterized by XRD, SEM, IR and DTA/TGA analyses. The results show that the chemical composition and morphology of precursor precipitates at pH=8.4？8.8 are different from those of precursor precipitates at pH=6.0, and the mechanisms of the thermal decomposition of the precursors are different. The effects of various conditions in the process of thermal decomposition, including precursor morphology, atmosphere, temperature and time on the morphology and dispersion degree of obtained nickel powders were studied in detail. The final product inherits the morphology of precursor when the thermal decomposition is conducted under a weakly reducing atmosphere at temperature range of 400？440 °C for 30 min. Fibrous nickel powder can be produced with good dispersion, and its shape changes from smooth, straight and compact fiber into loose and curved fiber with rough surface.
基金Supported by the National Natural Science Foundation of China(51304184)the Coal Based Key Scientific and Technological Project of Shanxi Province(MC2014-06)
文摘In Na_2O–CaO–SiO_2–H_2O system,systematic investigations of phase and morphology of calcium silicate in hydrothermal conditions were concisely conducted for high-value utilization of silicon resource in high-alumina fly ash(HAFA).The results show that crystal composition and phase may be affected by relatively low concentration of NaOH,and sodium ions are rearranged into the structure to form NaCaHSiO_4 and Na_2Ca_3H_8Si_2O_(12) with different C/S ratio at high concentration of Na OH.In addition,phases in wollastonite group possess the morphology of nano fiber.Formation of nano fiber is attributed to the difference of surface energies between axial and radial direction,and higher temperatures lead to easier growth along radial direction.The preparation of C–S–H with different phases and morphologies can guide for the application of silicate solution with high alkalinity with different purposes.
文摘Objective To optimize the therapeutic dosage of tetrandrine （Tet） in rat hepatic fibrosis roodel. Methods 50 Wistar rats were divided into 5 groups at random including normal control, model control, Tettreated model groups of 10mg· kg^ - 1· d^ - 1, 5mg· kg^ - 1· d^ - 1 and 2.5mg· kg^ - 1· d^ - 1（ n = 10 in each group ）. All rats, except for the normal controls, were injected with axenic porcine serum （0. 5ml each time, twice a week） intraperitoneally for 8 weeks to establish hepatic fibrosis. After the 8th week, rats of Tet-treated model groups were given by gavage once a day with different doses of Tet for another 8 weeks. Then the liver function, serum levels of hyaluronic acid （ HA ）, laminin （ LM）, and procollagen type Ⅲ （PCⅢ） were tested. Collagen type 1 and Ⅲ, pathological changes in liver tissue were also assessed. Results Most indices of liver function including alanine minotransferase （ALT）, aspartate aminotransferase （AST）, albumin （ ALB）, albumin/globulin ratio （ A/G） and alkaline phosphatase （ALP） improved significantly in Tet-treated groups with the exception of γ-glutamyl transpeptidase （γ- GT） and total bilirubin （TBIL）. Secondly, markedly lowered levels of HA, LM and collagen type I, III were also detected by radioimmunology and immunohistochemistry in the 5 mg· kg^ - 1· d^ - 1 Tet-treated model group. Moreover, pathologi- cal findings confirmed the statistically significant improvement in hepatofibrotic degree resulted from the treatment of 5mg· kg^ - 1· d^ - 1 rather than other doses of Tet. Conclusion For experimental Wistar rats, Tet exhibited an anti-hepatofibrotic action in doses within the range of 2.5mg· kg^ - 1· d^ - 1 to 10mg· kg^ - 1· d^ - 1 and 5mg· kg^ - 1· d^ - 1 may be the optimum one among all doses.
文摘Food diversification is a way to strengthen national food security, for example by reducing the dependence on wheat flour as a main raw material of various food products through the use of cassava flour. Cassava flour, a rich source of carbohydrates, can be used in the making of flakes. In this study, the Virgin coconut oil （VCO） waste flour was added in cassava flour to produce gluten-free cassava flour flakes with high dietary fiber contents. The six different formulas of flakes were used in this study with addition of 0% （control）, 10%, 20%, 30%, 40% and 50% coconut waste flour, respectively. Then, the chemical and microbiological characteristics of the flakes were measured. Based on the proximate data, both flours have a good quality. The microbiological analysis shows cassava flour and coconut waste flour have good sanitation and food safety. Results showed that flakes with 80% cassava flour and 20% coconut waste flour are gluten-free and contain 2.52% water, 2.27% ash, 14.40% fat, 4.50% protein, 76.31% carbohydrate, 8.56% dietary fiber. Therefore, it can be said that cassava flour flakes can serve as gluten-free and rich dietary fiber ready-to-eat food.
文摘Concrete, as an essential construction material in the construction industry, is the main component of solid waste. To improve the strength and durability of concrete, some additives can be added into concrete to replace parts of cement. Carbon fiber and silica powder are the most common additives. Under a series of experiments, the effects of temperature, carbon fiber and silica powder on the mechanical properties of concrete were studied under normal circumstances. In this paper, a conclusion on the effects was drawn up mainly through some experimental analyses, so as to discuss the effect laws and provide a reference to manufacture the concrete of high strength and properties.
