目的评价远程心脏康复对慢性心力衰竭患者的康复效果。方法计算机检索PubMed、Web of Science、Cochrane Library、Embase、中国生物医学数据库、知网、万方、维普数据库中有关远程心脏康复应用于慢性心力衰竭患者的随机对照试验,检索...目的评价远程心脏康复对慢性心力衰竭患者的康复效果。方法计算机检索PubMed、Web of Science、Cochrane Library、Embase、中国生物医学数据库、知网、万方、维普数据库中有关远程心脏康复应用于慢性心力衰竭患者的随机对照试验,检索时限为建库至2023年9月。采用RevMan 5.3软件进行统计分析。结果共纳入13项研究,涉及1674例患者。Meta分析结果显示,远程心脏康复可改善慢性心力衰竭患者6 min步行距离、峰值摄氧、N末端脑钠肽前体和生活质量(均P<0.05),但在改善左室射血分数方面,差异无统计学意义(P>0.05)。结论远程心脏康复可改善慢性心力衰竭患者的运动耐力和生活质量,为患者提供了一种新的康复方式。展开更多
For the purpose of developing an immune function on production accidents in a petrochemical enterprise, a new cultivation-evolution approach of preventive mechanism is suggested by analyzing various factors relating t...For the purpose of developing an immune function on production accidents in a petrochemical enterprise, a new cultivation-evolution approach of preventive mechanism is suggested by analyzing various factors relating to immune deficiency syndrome and by referring to immunity genetic algorithm and relevant concepts applied in medicine science. Accident-immunity system for highly hazardous petrochemical enterprise, which is made up of its productive system＇s Safety Organ and Safety Organization, is typically an evolution-cultivation progress for immune function, The new B immune cell is generated after several layers＇ screening, clone expanding, receptor editing, organizing in immune system of work accident in petrochemical enterprise. There is a B immune cell with high appetency and a manipulative function chain for accident-immunity. Taking the antigen of accidents in industry as the target function and the immune antibody as the solution, the authors carried out a computation diagram for prediction of appetency between the antigen and antibody.展开更多
The low-strength and high-brittleness of AZ91 cast magnesium alloy mainly result from the coarse divorced eutectic phase. To solve these problems, the annealing treatment of AZ91 cast magnesium alloy was carried out a...The low-strength and high-brittleness of AZ91 cast magnesium alloy mainly result from the coarse divorced eutectic phase. To solve these problems, the annealing treatment of AZ91 cast magnesium alloy was carried out at 415 ℃ and held for 24 h in this study and the alloy was then slowly cooled to room temperature in furnace. The microstructures of the alloy were observed using a metallographic microscope, a transmission electron microscopy and an emission scanning electron microscopy, respectively. The phase analysis was performed using the X-ray diffraction, and the tensile test of the specimen at ambient temperature was performed on a material test machine. The results indicate that the coarse divorced eutectic phase dissolves into the Mg matrix during the isothermal process, and the lamellarβ-Mg17AI12 phase precipitates from the magnesium solid solution with a type of pearlite precipitation during furnace cooling. Consequently, the spheroidizing treatment was carried out at 320℃ for 20 h following the annealing process and the lamellar β-Mg17A12 phase was spheroidized. Compared with the as-cast alloy, the strength and ductility of the AZ91 magnesium alloy are increased obviously after annealing treatment; the yield strength and tensile strength are increased to 137.8 MPa and 240.4 MPa from 102.9 MPa and 199.3 MPa, respectively; and the elongation is improved to 6.12% from 4.35%. After being spheroidized, the strength and hardness decrease a little, but the ductility is elevated to 7.23%. The nucleation, growth and spheroidizing mechanism of the lamellarβ-Mg12TAI12 phase were also discussed.展开更多
文摘For the purpose of developing an immune function on production accidents in a petrochemical enterprise, a new cultivation-evolution approach of preventive mechanism is suggested by analyzing various factors relating to immune deficiency syndrome and by referring to immunity genetic algorithm and relevant concepts applied in medicine science. Accident-immunity system for highly hazardous petrochemical enterprise, which is made up of its productive system＇s Safety Organ and Safety Organization, is typically an evolution-cultivation progress for immune function, The new B immune cell is generated after several layers＇ screening, clone expanding, receptor editing, organizing in immune system of work accident in petrochemical enterprise. There is a B immune cell with high appetency and a manipulative function chain for accident-immunity. Taking the antigen of accidents in industry as the target function and the immune antibody as the solution, the authors carried out a computation diagram for prediction of appetency between the antigen and antibody.
基金supported by the National Science&Technology Pillar Program of China(Grant No.2006BAE04B05-1)the Natural Science Foundation of Shanxi Province(Grant No.2012JQ6020)the Doctor Foundation of Xian University of Science & Technology of China(2011QDJ017)
文摘The low-strength and high-brittleness of AZ91 cast magnesium alloy mainly result from the coarse divorced eutectic phase. To solve these problems, the annealing treatment of AZ91 cast magnesium alloy was carried out at 415 ℃ and held for 24 h in this study and the alloy was then slowly cooled to room temperature in furnace. The microstructures of the alloy were observed using a metallographic microscope, a transmission electron microscopy and an emission scanning electron microscopy, respectively. The phase analysis was performed using the X-ray diffraction, and the tensile test of the specimen at ambient temperature was performed on a material test machine. The results indicate that the coarse divorced eutectic phase dissolves into the Mg matrix during the isothermal process, and the lamellarβ-Mg17AI12 phase precipitates from the magnesium solid solution with a type of pearlite precipitation during furnace cooling. Consequently, the spheroidizing treatment was carried out at 320℃ for 20 h following the annealing process and the lamellar β-Mg17A12 phase was spheroidized. Compared with the as-cast alloy, the strength and ductility of the AZ91 magnesium alloy are increased obviously after annealing treatment; the yield strength and tensile strength are increased to 137.8 MPa and 240.4 MPa from 102.9 MPa and 199.3 MPa, respectively; and the elongation is improved to 6.12% from 4.35%. After being spheroidized, the strength and hardness decrease a little, but the ductility is elevated to 7.23%. The nucleation, growth and spheroidizing mechanism of the lamellarβ-Mg12TAI12 phase were also discussed.
