期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
硝酸体系中Pt催化N_(2)H_(4)还原U(Ⅵ)制备U(Ⅳ)的反应动力学及反应历程 被引量:1
1
作者 张晓腾 郝帅 +4 位作者 唐菲菲 李斌 周贤明 刘利生 夏良树 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第5期813-822,I0012,共11页
为明确反应机理和反应历程,优化反应工艺,本文研究了硝酸环境下Pt催化N_(2)H_(4)还原U(Ⅵ)制备U(Ⅳ)的反应动力学,通过电子自旋共振法确定了硝酸氧化性影响范围,研究了硝酸、肼、U(Ⅵ)浓度以及催化剂用量对反应的影响,同时利用密度泛函... 为明确反应机理和反应历程,优化反应工艺,本文研究了硝酸环境下Pt催化N_(2)H_(4)还原U(Ⅵ)制备U(Ⅳ)的反应动力学,通过电子自旋共振法确定了硝酸氧化性影响范围,研究了硝酸、肼、U(Ⅵ)浓度以及催化剂用量对反应的影响,同时利用密度泛函理论对反应过程进行了模拟.结果表明,硝酸浓度在0.5 mol/L以下氧化性对实验主反应影响有限,在0.5 mol/L浓度范围内反应动力学方程为:-dc(UO_(2)^(2+))/dt)=kc^(0.5323)(UO_(2)^(2+))c^(0.2074)(N_(2)H_(5)^(+))c^(-0.2009)(H^(+));当温度为50℃,催化剂固液比为r=0.0667 g/mL时,反应的动力学速率常数k为k=0.00199(mol/L)^(0.4712)/min;在20~80℃之间,反应速率随温度的升高而逐渐增大,并由化学控制转变为扩散控制.通过密度泛函理论模拟进一步深入了解了各种因素对反应过程的影响,并结合反应动力学和模拟结果确定了反应机理. 展开更多
关键词 反应动力学 电子自旋共振法 密度泛函理论
下载PDF
China cardiovascular diseases report 2015: a summary 被引量:47
2
作者 Wei-Wei CHEN Run-Lin GAO +10 位作者 li-sheng liu Man-Lu ZHU Wen WANG Yong-Jun WANG Zhao-Su WU Hui-Jun LI Dong-Feng GU Yue-Jin YANG Zhe ZHENG Li-Xin JIANG Sheng-Shou HU 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2017年第1期1-10,共10页
关键词 心血管病 中国 心血管疾病 城市化进程 发生变化 生活方式 上升趋势 CVD
下载PDF
China cardiovascular diseases report 2018: an updated summary 被引量:55
3
作者 Li-Yuan MA Wei-Wei CHEN +9 位作者 Run-Lin GAO li-sheng liu Man-Lu ZHU Yong-Jun WANG Zhao-Su WU Hui-Jun LI Dong-Feng GU Yue-Jin YANG Zhe ZHENG Sheng-Shou HU 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2020年第1期1-8,共8页
1 Introduction Rapid socioeconomic progress has greatly affected the lifestyle in China.Consequently,owing to lifestyle changes,urbanization,and accelerated population aging,the risk of cardiovascular diseases(CVD)has... 1 Introduction Rapid socioeconomic progress has greatly affected the lifestyle in China.Consequently,owing to lifestyle changes,urbanization,and accelerated population aging,the risk of cardiovascular diseases(CVD)has increased.The incidence of CVD has been increasing continuously and this upward trend is projected to continue in the next decade.The growing burden of CVD has become a major public health issue. 展开更多
关键词 Cardiovascular diseases Heart failure Risk factors
下载PDF
Twenty-four-hour ambulatory blood pressure changes in older patients with essential hypertension receiving monotherapy or dual combination antihypertensive drug therapy 被引量:2
4
作者 Pei-Pei LU Xu MENG +9 位作者 Ying ZHANG Yan-Qi LI Shu WANG li-sheng liu Wen WANG Yu-Ling LI Yu-Qing ZHANG Ai-Hua HU Xian-Liang ZHOU Li-Hong MA 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2019年第4期354-361,共8页
Objective To evaluate the differences in 24-hour ambulatory blood pressure (BP) in older patients with hypertension treated with the five major classes of antihypertensive drugs,as monotherapy or dual combination ther... Objective To evaluate the differences in 24-hour ambulatory blood pressure (BP) in older patients with hypertension treated with the five major classes of antihypertensive drugs,as monotherapy or dual combination therapy,to improve daytime and nighttime BP control. Methods We enrolled 1920 Chinese community-dwelling outpatients aged ≥ 60 years and compared ambulatory BP values and ambulatory BP control (24-hour BP < 130/80 mmHg;daytime mean BP < 135/85 mmHg;and nighttime mean BP < 120/70 mmHg),as well as nighttime BP dip patterns for monotherapy and dual combination therapy groups. Results Patients’ mean age was 71 years,and 59.5% of patients were women. Calcium channel blockers (CCBs) constituted the most common (60.3% of patients) monotherapy,and renin–angiotensin system (RAS) blockers combined with CCBs was the most common (56.5% of patients) dual combination therapy. Monotherapy with beta-blockers (BB) provided the best daytime BP control. The probabilities of having a nighttime dip pattern and nighttime BP control were higher in patients receiving diuretics compared with CCBs (OR = 0.52,P = 0.05 and OR = 0.41,P = 0.007,respectively). Patients receiving RAS/diuretic combination therapy had a higher probability of having controlled nighttime BP compared with those receiving RAS/CCB (OR = 0.45,P = 0.004). Compared with RAS/diuretic therapy,BB/CCB therapy had a higher probability of achieving daytime BP control (OR = 1.27,P = 0.45). Conclusions Antihypertensive monotherapy and dual combination drug therapy provided different ambulatory BP control and nighttime BP dip patterns. BB-based regimens provided lower daytime BP,whereas diuretic-based therapies provided lower nighttime BP,compared with other antihypertensive regimens. 展开更多
关键词 Aging AMBULATORY blood pressure monitoring ANTIHYPERTENSIVE drugs BETA-BLOCKERS DIURETICS
下载PDF
Anemia in patients with Takayasu arteritis: prevalence, clinical features, and treatment 被引量:2
5
作者 Ying ZHANG Di ZHANG +11 位作者 Yi QU Peng FAN Ya-Xin liu Hui-Min ZHANG Lei SONG Wen-Jun MA Hai-Ying WU Jun CAI Fang LUO Xian-Liang ZHOU De-Yu ZHENG li-sheng liu 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2019年第9期689-694,共6页
Background Anemia is a common comorbidity of patients with Takayasu arteritis(TA). This study evaluated the prevalence, clinical characteristics, and treatment in Chinese TA patients with anemia. Methods This retrospe... Background Anemia is a common comorbidity of patients with Takayasu arteritis(TA). This study evaluated the prevalence, clinical characteristics, and treatment in Chinese TA patients with anemia. Methods This retrospective study included 533 consecutive patients hospitalized for TA from January 2009 to April 2018. Anemia was diagnosed on the basis of hemoglobin level, according to World Health Organization criteria. Results A total of 194 patients(36.4%) were diagnosed with anemia. Most had mild anemia(177, 91.2%). Female patients were predominant(92.8% of anemic patients). Normocytic anemia(62.9%) was the most common pattern. Anemic patients were more likely than non-anemic patients to have dizziness(29.4% vs. 21.2%), low body mass index(22.0 ± 3.6 vs. 22.9 ± 3.4 kg/m2), and active disease stage(64.9% vs. 50.1%);pulmonary involvement(12.4% vs. 26.8%), pulmonary hypertension(12.9% vs. 20.1%) and pulmonary hypertensive-target drugs(2.8% vs. 11.6%) were less common among anemic than non-anemic patients(all P < 0.05). Larger left ventricular end-diastolic diameter and lower left ventricular ejection fraction were observed in anemic patients. Over a median follow-up of four months, the increase of hemoglobin in anemic patients was associated with the use of iron supplementation. Conclusions Anemia is a very common concurrent condition in TA, especially in young, female patients. Patients with anemia are more likely to be in the active disease stage. Iron supplementation helps increase hemoglobin. 展开更多
关键词 ANEMIA Disease activity ORAL iron supplementation TAKAYASU ARTERITIS
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部