Solar air heaters are at the centre of interest owing to their widespread use for various purposes.In the study,thermal performance analysis of a solar air heater that can be easily produced from daily waste materials...Solar air heaters are at the centre of interest owing to their widespread use for various purposes.In the study,thermal performance analysis of a solar air heater that can be easily produced from daily waste materials is done.The system has a low-cost structure with both waste material use and a simple design.The proposed system is tested under different climatic conditions,and the energetic and the exergetic performance figures are obtained for the first time in literature.It is observed from the experimental tests that the results are stable and coherent as well as in good accordance with the similar attempts in literature with some cost reductions and performance improvements.Thermodynamic performance analyses indicate that the maximum energy efficiency of the system is about 21%,whereas the exergy efficiency is 1.8%.The energetic and exergetic outputs of the system are also determined to be 27 W and 3 W,respectively,which is promising.展开更多
The environmental issues associated with packaging materials have been attracting increasing attention.Life cycle assessment( LCA) is currently the main method used worldwide for evaluating green packaging materials. ...The environmental issues associated with packaging materials have been attracting increasing attention.Life cycle assessment( LCA) is currently the main method used worldwide for evaluating green packaging materials. In this study,the LCA method was used to evaluate the environmental impact of Baosteel’s newly developed process for manufacturing film-laminated steel packaging materials,from raw material mining,production,and processing to their storage,consumption,recycling,and final disposal. The environmental performance and main influencing factors were analyzed and compared. In addition,the life cycle environmental characteristics of film-laminated steel cans,tin-plated steel cans,and aluminum cans were compared. Of the main environmental indicators of the life cycle of the film-laminated steel can,the environmental load of the substrate accounts for the largest proportion,follow ed by electricity. The environmental impact of the production of film materials cannot be ignored. The overall environmental performance of film-laminated steel cans is better than that of aluminum cans.展开更多
目的通过对比分析去肾神经术(renal denervation,RD)和药物治疗对急性心肌梗死(acute myocardial infarction,AMI)后心力衰竭(heart failure,HF)大鼠模型心功能、肾素-血管紧张素-醛固酮系统、交感神经系统和心脏自主神经系统的影响,探...目的通过对比分析去肾神经术(renal denervation,RD)和药物治疗对急性心肌梗死(acute myocardial infarction,AMI)后心力衰竭(heart failure,HF)大鼠模型心功能、肾素-血管紧张素-醛固酮系统、交感神经系统和心脏自主神经系统的影响,探究RD与抗HF药物的疗效差异、最佳治疗时机以及疗效机制。方法 140只雄性Wistar大鼠,随机分为对照组、AMI组(心肌梗死组)、RD组(去肾神经组)、MI-1d+RD组(AMI后1天行RD)、MI-1d+Drugs组(AMI后1天予以药物治疗)、MI-4w+RD组(AMI后4周行RD)、MI-4w+Drugs组(AMI后4周予以药物治疗),每组各20只。AMI后1天及4周后分别行RD、β受体阻滞剂(β-blocker)+血管紧张素受体拮抗剂(ACEI)药物联合治疗。检测并记录AMI后8周各组大鼠模型的心功能、血浆脑钠尿肽(brain natriuretic peptide,BNP)、肾素、血管紧张素Ⅱ(Ang Ⅱ)、醛固酮(aldosterone,ALD)、去甲肾上腺素(norepinephrine,NE)水平,梗死心肌NE含量,心率和5 min内NN间期标准差(standard deviation of NN intervals,SDNN)。结果 AMI后8周,对照组、AMI组、RD组、MI-1d+RD组、MI-1d+Drugs组、MI-4w+RD组、MI-4w+Drugs组大鼠的左心室射血分数(left ventricular ejection fraction,LVEF)分别为85%、36%、82%、77%、65%、53%、45%。AMI组大鼠较对照组LVEF显著下降( P <0.05),血浆BNP、肾素、Ang Ⅱ、ALD、NE水平均显著增加( P <0.05),梗死心肌NE水平、HR显下降( P <0.05),SDNN显著增加( P <0.05)。MI-1d+RD组大鼠较AMI及MI-1d+Drugs组LVEF显著增加( P <0.05),血浆BNP、肾素、Ang II、ALD、NE水平均显著下降( P < 0.05 )。MI-1d+RD组、MI-1d+Drugs组大鼠较AMI组梗死心肌NE含量、心率显著均增加( P <0.05),SDNN显著下降( P <0.05);MI-4w+RD组、MI-4w+Drugs组大鼠较AMI组梗死心肌NE、心率及SDNN差异均无统计学意义( P >0.05)。结论 AMI后早期行RD改善心功能的疗效强于β受体阻滞剂与血管紧张素转化酶抑制剂联合治疗,其疗效机制包括抑制交感神经系统、肾素-血管紧张素-醛固酮系统活性以及调节心脏交感-迷走神经功能平衡。展开更多
Pediatric autoimmune neuropsychiatric disorders associated with group A streptococcal infections (PANDAS) is a concept that is used to characterize a subset of children with neuropsychiatric symptoms, tic disorders, o...Pediatric autoimmune neuropsychiatric disorders associated with group A streptococcal infections (PANDAS) is a concept that is used to characterize a subset of children with neuropsychiatric symptoms, tic disorders, or obsessive-compulsive disorder (OCD), whose symptoms are exacerbated by group A streptococcal (GAS) infection. PANDAS has been known to cause a sudden onset of reward deficiency syndrome (RDS). RDS includes multiple disorders that are characterized by dopaminergic signaling dysfunction in the brain reward cascade (BRC), which may result in addiction, depression, avoidant behaviors, anxiety, tic disorders, and/or OCD. According to research by Blum et al., the dopamine receptor D2 (DRD2) gene polymorphisms are important prevalent genetic determinants of RDS. The literature demonstrates that infections like Borrelia and Lyme, as well as other infections like group A beta-hemolytic streptococcal (GABHS), can cause an autoimmune reaction and associated antibodies target dopaminergic loci in the mesolimbic region of the brain, which interferes with brain function and potentially causes RDS-like symptoms/behaviors. The treatment of PANDAS remains controversial, especially since there have been limited efficacy studies to date. We propose an innovative potential treatment for PANDAS based on previous clinical trials using a pro-dopamine regulator known as KB220 variants. Our ongoing research suggests that achieving “dopamine homeostasis” by precision-guided DNA testing and pro-dopamine modulation could result in improved therapeutic outcomes.展开更多
文摘Solar air heaters are at the centre of interest owing to their widespread use for various purposes.In the study,thermal performance analysis of a solar air heater that can be easily produced from daily waste materials is done.The system has a low-cost structure with both waste material use and a simple design.The proposed system is tested under different climatic conditions,and the energetic and the exergetic performance figures are obtained for the first time in literature.It is observed from the experimental tests that the results are stable and coherent as well as in good accordance with the similar attempts in literature with some cost reductions and performance improvements.Thermodynamic performance analyses indicate that the maximum energy efficiency of the system is about 21%,whereas the exergy efficiency is 1.8%.The energetic and exergetic outputs of the system are also determined to be 27 W and 3 W,respectively,which is promising.
文摘The environmental issues associated with packaging materials have been attracting increasing attention.Life cycle assessment( LCA) is currently the main method used worldwide for evaluating green packaging materials. In this study,the LCA method was used to evaluate the environmental impact of Baosteel’s newly developed process for manufacturing film-laminated steel packaging materials,from raw material mining,production,and processing to their storage,consumption,recycling,and final disposal. The environmental performance and main influencing factors were analyzed and compared. In addition,the life cycle environmental characteristics of film-laminated steel cans,tin-plated steel cans,and aluminum cans were compared. Of the main environmental indicators of the life cycle of the film-laminated steel can,the environmental load of the substrate accounts for the largest proportion,follow ed by electricity. The environmental impact of the production of film materials cannot be ignored. The overall environmental performance of film-laminated steel cans is better than that of aluminum cans.
文摘目的通过对比分析去肾神经术(renal denervation,RD)和药物治疗对急性心肌梗死(acute myocardial infarction,AMI)后心力衰竭(heart failure,HF)大鼠模型心功能、肾素-血管紧张素-醛固酮系统、交感神经系统和心脏自主神经系统的影响,探究RD与抗HF药物的疗效差异、最佳治疗时机以及疗效机制。方法 140只雄性Wistar大鼠,随机分为对照组、AMI组(心肌梗死组)、RD组(去肾神经组)、MI-1d+RD组(AMI后1天行RD)、MI-1d+Drugs组(AMI后1天予以药物治疗)、MI-4w+RD组(AMI后4周行RD)、MI-4w+Drugs组(AMI后4周予以药物治疗),每组各20只。AMI后1天及4周后分别行RD、β受体阻滞剂(β-blocker)+血管紧张素受体拮抗剂(ACEI)药物联合治疗。检测并记录AMI后8周各组大鼠模型的心功能、血浆脑钠尿肽(brain natriuretic peptide,BNP)、肾素、血管紧张素Ⅱ(Ang Ⅱ)、醛固酮(aldosterone,ALD)、去甲肾上腺素(norepinephrine,NE)水平,梗死心肌NE含量,心率和5 min内NN间期标准差(standard deviation of NN intervals,SDNN)。结果 AMI后8周,对照组、AMI组、RD组、MI-1d+RD组、MI-1d+Drugs组、MI-4w+RD组、MI-4w+Drugs组大鼠的左心室射血分数(left ventricular ejection fraction,LVEF)分别为85%、36%、82%、77%、65%、53%、45%。AMI组大鼠较对照组LVEF显著下降( P <0.05),血浆BNP、肾素、Ang Ⅱ、ALD、NE水平均显著增加( P <0.05),梗死心肌NE水平、HR显下降( P <0.05),SDNN显著增加( P <0.05)。MI-1d+RD组大鼠较AMI及MI-1d+Drugs组LVEF显著增加( P <0.05),血浆BNP、肾素、Ang II、ALD、NE水平均显著下降( P < 0.05 )。MI-1d+RD组、MI-1d+Drugs组大鼠较AMI组梗死心肌NE含量、心率显著均增加( P <0.05),SDNN显著下降( P <0.05);MI-4w+RD组、MI-4w+Drugs组大鼠较AMI组梗死心肌NE、心率及SDNN差异均无统计学意义( P >0.05)。结论 AMI后早期行RD改善心功能的疗效强于β受体阻滞剂与血管紧张素转化酶抑制剂联合治疗,其疗效机制包括抑制交感神经系统、肾素-血管紧张素-醛固酮系统活性以及调节心脏交感-迷走神经功能平衡。
文摘Pediatric autoimmune neuropsychiatric disorders associated with group A streptococcal infections (PANDAS) is a concept that is used to characterize a subset of children with neuropsychiatric symptoms, tic disorders, or obsessive-compulsive disorder (OCD), whose symptoms are exacerbated by group A streptococcal (GAS) infection. PANDAS has been known to cause a sudden onset of reward deficiency syndrome (RDS). RDS includes multiple disorders that are characterized by dopaminergic signaling dysfunction in the brain reward cascade (BRC), which may result in addiction, depression, avoidant behaviors, anxiety, tic disorders, and/or OCD. According to research by Blum et al., the dopamine receptor D2 (DRD2) gene polymorphisms are important prevalent genetic determinants of RDS. The literature demonstrates that infections like Borrelia and Lyme, as well as other infections like group A beta-hemolytic streptococcal (GABHS), can cause an autoimmune reaction and associated antibodies target dopaminergic loci in the mesolimbic region of the brain, which interferes with brain function and potentially causes RDS-like symptoms/behaviors. The treatment of PANDAS remains controversial, especially since there have been limited efficacy studies to date. We propose an innovative potential treatment for PANDAS based on previous clinical trials using a pro-dopamine regulator known as KB220 variants. Our ongoing research suggests that achieving “dopamine homeostasis” by precision-guided DNA testing and pro-dopamine modulation could result in improved therapeutic outcomes.
