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重力驱动的水滴在土壤毛孔内非稳态运动研究
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作者 童燕 杨青山 +1 位作者 张玉龙 王秋玲 《安徽农业科学》 CAS 2016年第15期143-145,149,共4页
重力驱动下的水滴入渗是多孔介质特别是土壤中水分运移的一个基本问题,理论研究中常常用毛细管内的液塞(slug)运动来模拟。考虑前端液面的动态接触角效应,建立包含接触角参数的描述液塞非稳态运动过程的动力学模型,并对该模型进行了试... 重力驱动下的水滴入渗是多孔介质特别是土壤中水分运移的一个基本问题,理论研究中常常用毛细管内的液塞(slug)运动来模拟。考虑前端液面的动态接触角效应,建立包含接触角参数的描述液塞非稳态运动过程的动力学模型,并对该模型进行了试验验证。应用该模型,研究多孔介质物理性质如斥水性、毛细管内径和液塞初始长度等参数对液塞运动过程的影响。结果表明:接触角的增加能显著影响毛管内液塞的下落速度,表明斥水性增加将显著降低土壤等多孔介质的导渗率;液塞在大管径毛管中平均速度较大,但能够到达的最终深度较小;相反地,液塞在小管径毛管中的平均下落速度较小,但能到达的最终深度较大。综合得出,在考虑孔隙结构统计分布的基础上,该模型可用于宏观入渗过程的模拟研究。 展开更多
关键词 土壤孔隙 液塞动力学 薄膜 垂直毛细管 非稳态 接触角
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Coronary Artery Vasospasm with Acute Myocardial Infarction in a Male Patient: Case Report 被引量:1
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作者 Angelo Alencar Mello Savoldi Alexandre Mello Savoldi +2 位作者 Gustavo Alexandre Dutra Shirley Katherine Tinajero Enriquez Gregue Marques Leite Costa 《Journal of Pharmacy and Pharmacology》 2018年第5期495-501,共7页
We present a 48-year-old male patient with a history of classic precordialgia, ST-segment elevation in inferior leads (II, III and aVF), with t:oponin m:d CK-MB (creatine kinase-MB) elevated on the day of admiss... We present a 48-year-old male patient with a history of classic precordialgia, ST-segment elevation in inferior leads (II, III and aVF), with t:oponin m:d CK-MB (creatine kinase-MB) elevated on the day of admission that received conventional anti-ischemic treatment. Hemodynamically stable, symptom-free, is referred to cardiac catheterization. In the selective catheterization of the left coronary artery, a moderate lesion was observed in the middle third of the anterior descending coronary artery; in the right coronary artery, a subocclusive proximal lesion with TIMI (thrombolysis in myocardial infarction) II. We performed a single projection m:d opted for angioplasty. Before, it was decided to re-evaluate the left coronary artery, m:d it was observed in the contrast test that anterior descending artery was occluded. Intra-coronary nitroglycerin and new contrast injection were performed, which showed totally open descending artery with TIMI III, without obstructive lesions as initially suggested, and improvement of pain. It was a severe coronary vasospasm. When a new contrast injection was performed in the right coronary, with a therapeutic catheter, the disappeaxance of the subocclusive lesion and the presence of a normal coronary flow were observed, although there was a moderate plaque in its proximal third, which motivated the maintenance of angioplasty with stent placement in a proxhnal third of right coronary artery. During the passage of the intracoronary guidewire it was once again evident that diffuse coronary artery vasoreactivity was present; the procedure was successfully completed. 展开更多
关键词 Angina pectoris VARIANT acute myocardial infarction.
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