Furong, Hunan, is a large tin orefield discovered in China in recent years, which is mainly of the skarn-greisen-chlorite type. On the basis of the geological characteristics of the orefield, 40Ar-39Ar dating was perf...Furong, Hunan, is a large tin orefield discovered in China in recent years, which is mainly of the skarn-greisen-chlorite type. On the basis of the geological characteristics of the orefield, 40Ar-39Ar dating was performed on muscovite from greisen-type tin ore and biotite from related amphibole-biotite granite, which yielded three sets of age data, i.e., a plateau age of 157.5±0.3 Ma and an isochron age of 156.9±3 Ma for amphibole-biotite granite; a plateau age of 156.1±0.4 Ma and an isochron age of 155.7±1.7 Ma for the Sanmen greisen-type tin ore; and a plateau age of 160.1±0.9 Ma and an isochron age of 157.5±1.5 Ma for the Taoxiwo greisen-type tin ore. The three sets of age data coincide well with each other. They not only accurately reflect the timing of rock and ore formation but also indicate close relations between granite and tin deposits. In addition, the plateau ages of all three sets suggest that no subsequent thermal perturbation event occurred after the formation of granite and tin deposits. The Furong tin orefield is a component part of the southern Hunan large tungsten-tin polymetallic deposit concentration area and also a representative deposit formed in the time interval of 160-135 Ma in four peaks of Mesozoic tungsten-tin mineralization in the South China region. They might still correspond to the middle and late stages of the major geodynamic transition from a N-S- to an E-W-direction in eastern China.展开更多
Objective: to investigate the expression of Umbilical vein catheterization in premature infants. The nursing effect of UVC was studied and analyzed. Methods: analysis in November 2020 to October 2021 income children w...Objective: to investigate the expression of Umbilical vein catheterization in premature infants. The nursing effect of UVC was studied and analyzed. Methods: analysis in November 2020 to October 2021 income children with neonatal intensive care unit in our data, aim for 88 cases of premature infants screening study standard implementation of contrast experiment, with income time difference can be divided into control group 29 cases, 59 cases of study group, and in its treatment, respectively, in the process of implementation of peripheral venous indwelling surgery nursing, UVC. The incidence of nosocomial infection and complications, weight gain and length of stay were used as evaluation indexes to analyze the nursing effect. Results: compared with the incidence of nosocomial infection, complications and length of stay, the level of indicators in the study group was lower than that in the control group, and the differences in indicators were statistically significant (P<0.05). Compared with the weight gain of children, the index level of the study group was higher than that of the control group, and the differences in the indexes were statistically significant (P<0.05). Conclusion: UVC nursing is a simple and safe nursing treatment technology. When applied in the treatment of premature infants, the weight gain of infants is more ideal, and the risk of infection and complications can be reduced while promoting their early discharge, which has further promotion and application value.展开更多
An MCM-41/mordenite composite with two- fold porous structure and stepwise-distributed acidity was prepared for the first time by using zeolite mordenite as the silica-alumina source. The composite molecular sieve has...An MCM-41/mordenite composite with two- fold porous structure and stepwise-distributed acidity was prepared for the first time by using zeolite mordenite as the silica-alumina source. The composite molecular sieve has been investigated and compared with a mechanical mixture of mordenite and MCM-41 for their structure, acidity and catalytic activity by means of XRD, N2 adsorption and desorption, HRTEM, DTG, NH3-TPD and catalytic reaction. The characterization results show that the structure and property of the composite molecular sieve are quite different from those of the mechanical mixture, which might be ascribed to the incorporation of secondary building units characteristic of zeolite mordenite into the mesoporous walls of the composite which gives rise to the thicker mesoporous walls, the higher hydrothermal stability and more strong acid sites. Furthermore, the new strategy could be used as a new general method for the preparation of catalysts for the reaction system with multifold large molecules, and the results were well confirmed by the dealkylation of C10+ aromatic hydrocarbon.展开更多
文摘Furong, Hunan, is a large tin orefield discovered in China in recent years, which is mainly of the skarn-greisen-chlorite type. On the basis of the geological characteristics of the orefield, 40Ar-39Ar dating was performed on muscovite from greisen-type tin ore and biotite from related amphibole-biotite granite, which yielded three sets of age data, i.e., a plateau age of 157.5±0.3 Ma and an isochron age of 156.9±3 Ma for amphibole-biotite granite; a plateau age of 156.1±0.4 Ma and an isochron age of 155.7±1.7 Ma for the Sanmen greisen-type tin ore; and a plateau age of 160.1±0.9 Ma and an isochron age of 157.5±1.5 Ma for the Taoxiwo greisen-type tin ore. The three sets of age data coincide well with each other. They not only accurately reflect the timing of rock and ore formation but also indicate close relations between granite and tin deposits. In addition, the plateau ages of all three sets suggest that no subsequent thermal perturbation event occurred after the formation of granite and tin deposits. The Furong tin orefield is a component part of the southern Hunan large tungsten-tin polymetallic deposit concentration area and also a representative deposit formed in the time interval of 160-135 Ma in four peaks of Mesozoic tungsten-tin mineralization in the South China region. They might still correspond to the middle and late stages of the major geodynamic transition from a N-S- to an E-W-direction in eastern China.
文摘Objective: to investigate the expression of Umbilical vein catheterization in premature infants. The nursing effect of UVC was studied and analyzed. Methods: analysis in November 2020 to October 2021 income children with neonatal intensive care unit in our data, aim for 88 cases of premature infants screening study standard implementation of contrast experiment, with income time difference can be divided into control group 29 cases, 59 cases of study group, and in its treatment, respectively, in the process of implementation of peripheral venous indwelling surgery nursing, UVC. The incidence of nosocomial infection and complications, weight gain and length of stay were used as evaluation indexes to analyze the nursing effect. Results: compared with the incidence of nosocomial infection, complications and length of stay, the level of indicators in the study group was lower than that in the control group, and the differences in indicators were statistically significant (P<0.05). Compared with the weight gain of children, the index level of the study group was higher than that of the control group, and the differences in the indexes were statistically significant (P<0.05). Conclusion: UVC nursing is a simple and safe nursing treatment technology. When applied in the treatment of premature infants, the weight gain of infants is more ideal, and the risk of infection and complications can be reduced while promoting their early discharge, which has further promotion and application value.
基金supported by the National Natural Science Foundation of China(Grant Nos.20173039 and 20476060)the National Basic Research Program of China(Grant No.2004CB2 17806)the Petrochina Chemical Company Limiled.
文摘An MCM-41/mordenite composite with two- fold porous structure and stepwise-distributed acidity was prepared for the first time by using zeolite mordenite as the silica-alumina source. The composite molecular sieve has been investigated and compared with a mechanical mixture of mordenite and MCM-41 for their structure, acidity and catalytic activity by means of XRD, N2 adsorption and desorption, HRTEM, DTG, NH3-TPD and catalytic reaction. The characterization results show that the structure and property of the composite molecular sieve are quite different from those of the mechanical mixture, which might be ascribed to the incorporation of secondary building units characteristic of zeolite mordenite into the mesoporous walls of the composite which gives rise to the thicker mesoporous walls, the higher hydrothermal stability and more strong acid sites. Furthermore, the new strategy could be used as a new general method for the preparation of catalysts for the reaction system with multifold large molecules, and the results were well confirmed by the dealkylation of C10+ aromatic hydrocarbon.
