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非成岩水合物单喷嘴射流破碎规律实验研究 被引量:4
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作者 张计春 钟林 +5 位作者 王国荣 王雷振 李清平 付强 何玉发 陈雨 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2021年第2期607-613,共7页
为了提高单喷嘴射流破碎采掘水合物的效率,推进海洋非成岩水合物固态流化开采的商业化进程,基于非成岩水合物替代试样,设计非成岩天然气水合物单喷嘴射流破碎实验方案,搭建单喷嘴射流破碎实验系统,研究射流时间、射流靶距、射流压力和... 为了提高单喷嘴射流破碎采掘水合物的效率,推进海洋非成岩水合物固态流化开采的商业化进程,基于非成岩水合物替代试样,设计非成岩天然气水合物单喷嘴射流破碎实验方案,搭建单喷嘴射流破碎实验系统,研究射流时间、射流靶距、射流压力和喷嘴水平段直径等因素对替代样射流破碎深度和破碎体积的影响。研究结果表明:在所设的实验条件下,随时间增加,水合物破碎深度和破碎体积呈先增大后趋于平稳的趋势,水射流作用下达到极限破碎深度的时间为30 s;破碎体积和破碎深度与射流靶距呈反比例关系,与射流压力呈近似二次方正比例关系;破碎深度与水平段直径呈正比例线性关系,破碎体积与水平段直径呈二次方关系;在射流压力和直径的影响下,破碎相同体积所需要的耗能分别为0.91 W/cm^(3)和2.85 W/cm^(3),射流压力对非成岩水合物的射流破碎影响更大。该研究为海洋非成岩水合物的固态流化射流破碎缩扩型单喷嘴的设计及优化提供了实验依据。 展开更多
关键词 非成岩水合物 替代样 单喷嘴 破碎深度 破碎体积
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Andropause and the development of cardiovascular disease presentationmore than an epi-phenomenon 被引量:1
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作者 Emst R. Schwarz Anita Phan Robert D. Willix Jr 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2011年第1期35-43,共9页
Andropause refers to a generalized decline of male hormones, including testosterone and dehydroepiandrosterone in middle-aged and aging men. This decline in hormones has been associated with changes such as depression... Andropause refers to a generalized decline of male hormones, including testosterone and dehydroepiandrosterone in middle-aged and aging men. This decline in hormones has been associated with changes such as depression, loss of libido, sexual dysfunction, and changes in body composition. Aging has been associated with an abundance of concomitant diseases, in particular cardiovascular diseases, and although andropause is correlated to aging, a causal relationship between reduction of androgens and the development of chronic diseases such as atherosclerosis and heart failure has not been convincingly established yet. On the other hand, increasing data has emerged that revealed the effects of low levels of androgens on cardiovascular disease progression. As an example, low levels of testosterone have been linked to a higher incidence of coronary artery disease. Whether hormone replacement therapy that is used for andropausal men to alleviate symptoms of "male menopause" can halt progression of cardiovascular disease, remains controversially discussed, primarily due to the lack of well-designed, randomized controlled trials. At least for symptom improvement, the use of androgen replacement therapy in andropausal men may be clinically indicated, and with the appropriate supervision and follow up may prove to be beneficial with regard to preservation of the integrity of cardiovascular health at higher ages. 展开更多
关键词 ANDROPAUSE age ANDROGEN TESTOSTERONE heart disease heart failure hormone therapy
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