以乙醇为溶剂、RhCl3.3H2O为铑源、三苯基膦(PPh3)为配体及甲醛为羰基源,在常压回流条件下一步法合成目标铑膦配合物HRh(CO)(PPh3)3,考察了不同氢源(H2、NaBH4和KOH)对铑膦配合物结构的影响.利用FT-IR、31P CP MAS NMR和XPS等对不同氢...以乙醇为溶剂、RhCl3.3H2O为铑源、三苯基膦(PPh3)为配体及甲醛为羰基源,在常压回流条件下一步法合成目标铑膦配合物HRh(CO)(PPh3)3,考察了不同氢源(H2、NaBH4和KOH)对铑膦配合物结构的影响.利用FT-IR、31P CP MAS NMR和XPS等对不同氢源条件下制备的铑膦配合物产物的结构进行表征.结果显示:以H2为氢源时,铑膦配合物产物主要为trans-RhCl(CO)(PPh3)2;以NaBH4为氢源时,产物为trans-RhCl(CO)(PPh3)2和HRh(CO)(PPh3)3的混合产物,同时甲醛溶液的滴加速度对产物的组成也有着重要影响,通过控制甲醛溶液的滴加速度可以有效抑制产物中trans-RhCl(CO)(PPh3)2的含量;以KOH为氢源时,产物为目标产物HRh(CO)(PPh3)3.展开更多
Background: Attrition of health professionals from public health sectors is found to be a barrier to effectiveness of health systems and to provide essential health service to population. In Ethiopia, the public healt...Background: Attrition of health professionals from public health sectors is found to be a barrier to effectiveness of health systems and to provide essential health service to population. In Ethiopia, the public health system is the major provider of health care service to the people. In particular, the poor segment of community uses public hospital, health centers and clinic, since the private health facilities are inaccessible and unaffordable to them. The aim of this study was to determine the magnitude and factors associated with health professionals’ attrition from public health sectors in Bahir Dar city. Methods: A Facility based cross-sectional study was conducted in September-October 2012. All inclusive sampling techniques of five years document reviews were used to select 727 health professional documents. Quantitative and qualitative data were collected using structured questionnaires and indepth-interview guides respectively, by trained data collectors. Descriptive statistics (frequencies, proportion and chi square test) were used to describe the study population in relation to relevant variables. To identify independent predictors of attrition, only variables that were statistically significant during bivariate analysis were entered into multiple logistic regression models to control the effects of confounders. Pvalues sex, marital status, educational status, workplace, current salary, professional category and work experience were the main factors associated with health professionals’ attrition from public health sectors. Conclusion: The findings showed that the level of health professionals’ attrition is high in the study area. Policy makers and health mangers should design appropriate retention strategies for health professionals at public health sectors in terms of most associated factors with attritions of health professionals to reduce the prevalence of health professionals’ attrition from public health sectors in collaboration with development partners and concerned body.展开更多
To the Editor:The incidence of pulmonary atresia with intact ventricular septum(PA/IVS)is 1.9%in congential heart disease.The most serious manifestation is hypoplastic right heart syndrome(HRHS).HRHS and low birth wei...To the Editor:The incidence of pulmonary atresia with intact ventricular septum(PA/IVS)is 1.9%in congential heart disease.The most serious manifestation is hypoplastic right heart syndrome(HRHS).HRHS and low birth weight have been determined as the major risk factors of fetal death after birth.Fetal pulmonary valvuloplasty(FPV)could relieve obstruction of the right ventricular outflow tract,restore growth potential of right ventricle,and increase the chances of biventricular circulation.However,so far fewer than 70 HRHS cases have been reported at the International Fetal Cardiac Intervention Registry(http://www.ifcir.org/)and there is a lack of postnatal treatment experience.展开更多
文摘以乙醇为溶剂、RhCl3.3H2O为铑源、三苯基膦(PPh3)为配体及甲醛为羰基源,在常压回流条件下一步法合成目标铑膦配合物HRh(CO)(PPh3)3,考察了不同氢源(H2、NaBH4和KOH)对铑膦配合物结构的影响.利用FT-IR、31P CP MAS NMR和XPS等对不同氢源条件下制备的铑膦配合物产物的结构进行表征.结果显示:以H2为氢源时,铑膦配合物产物主要为trans-RhCl(CO)(PPh3)2;以NaBH4为氢源时,产物为trans-RhCl(CO)(PPh3)2和HRh(CO)(PPh3)3的混合产物,同时甲醛溶液的滴加速度对产物的组成也有着重要影响,通过控制甲醛溶液的滴加速度可以有效抑制产物中trans-RhCl(CO)(PPh3)2的含量;以KOH为氢源时,产物为目标产物HRh(CO)(PPh3)3.
文摘Background: Attrition of health professionals from public health sectors is found to be a barrier to effectiveness of health systems and to provide essential health service to population. In Ethiopia, the public health system is the major provider of health care service to the people. In particular, the poor segment of community uses public hospital, health centers and clinic, since the private health facilities are inaccessible and unaffordable to them. The aim of this study was to determine the magnitude and factors associated with health professionals’ attrition from public health sectors in Bahir Dar city. Methods: A Facility based cross-sectional study was conducted in September-October 2012. All inclusive sampling techniques of five years document reviews were used to select 727 health professional documents. Quantitative and qualitative data were collected using structured questionnaires and indepth-interview guides respectively, by trained data collectors. Descriptive statistics (frequencies, proportion and chi square test) were used to describe the study population in relation to relevant variables. To identify independent predictors of attrition, only variables that were statistically significant during bivariate analysis were entered into multiple logistic regression models to control the effects of confounders. Pvalues sex, marital status, educational status, workplace, current salary, professional category and work experience were the main factors associated with health professionals’ attrition from public health sectors. Conclusion: The findings showed that the level of health professionals’ attrition is high in the study area. Policy makers and health mangers should design appropriate retention strategies for health professionals at public health sectors in terms of most associated factors with attritions of health professionals to reduce the prevalence of health professionals’ attrition from public health sectors in collaboration with development partners and concerned body.
基金grants from the National Natural Science Foundation of China(No.81770316)the Research Fund for the Taishan Scholars Project(2018).
文摘To the Editor:The incidence of pulmonary atresia with intact ventricular septum(PA/IVS)is 1.9%in congential heart disease.The most serious manifestation is hypoplastic right heart syndrome(HRHS).HRHS and low birth weight have been determined as the major risk factors of fetal death after birth.Fetal pulmonary valvuloplasty(FPV)could relieve obstruction of the right ventricular outflow tract,restore growth potential of right ventricle,and increase the chances of biventricular circulation.However,so far fewer than 70 HRHS cases have been reported at the International Fetal Cardiac Intervention Registry(http://www.ifcir.org/)and there is a lack of postnatal treatment experience.
