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JBL CADP2声压图和数据分析
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作者 吴晓路 《艺术科技》 2001年第1期45-47,共3页
关键词 JBL CADP2 音响系统 场设计 计算机辅助设计软件 声压图 数据分析
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带有环球影像镜头后视镜对汽车气动噪声的影响研究 被引量:1
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作者 郭思媛 胡春红 王之丰 《机械设计与制造》 北大核心 2017年第7期212-215,共4页
为探究带环球影像镜头后视镜对汽车气动噪声的影响,运用Lighthill-Curle声类比方法,对带环球影像镜头后视镜尾部气流的流动以及汽车前侧窗处声场进行研究分析。分析表明:车辆在高速行驶条件下,带有镜头方案的后视镜尾部气流相对于原方... 为探究带环球影像镜头后视镜对汽车气动噪声的影响,运用Lighthill-Curle声类比方法,对带环球影像镜头后视镜尾部气流的流动以及汽车前侧窗处声场进行研究分析。分析表明:车辆在高速行驶条件下,带有镜头方案的后视镜尾部气流相对于原方案发生较大变化,同时通过计算得到声压频谱图可知,频率在中高频段时,带有镜头方案的前侧窗区域的气动噪声相对于原方案的声压级有所增大。最后,为探究带有镜头后视镜对驾驶舱内气动噪声的影响,对带镜头方案和原方案分别进行噪声风洞试验。试验结果表明:带有镜头方案舱内声压级高于原方案,同时测得舱内语言清晰度也有所下降。试验结果与数值分析一致,验证了数值分析的正确性,为汽车后视镜气动噪声地控制提出了理论依据,有利改善司乘人员乘坐的舒适性。 展开更多
关键词 车外后视镜 流场 气动噪 频谱 环球影像镜头
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Assessment of Left Atrial Function by Full Volume Real-time Three-dimensional Echocardiography and Left Atrial Tracking in Essential Hypertension Patients with Different Patterns of Left Ventricular Geometric Models 被引量:9
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作者 Yang Wang Lin Gao +1 位作者 Jian-bai Li Chao Yu 《Chinese Medical Sciences Journal》 CAS CSCD 2013年第3期152-158,共7页
Objective To evaluate left atrial function in essential hypertension patients with different patterns of left ventricular geometric models by real-time three-dimensional echocardiography (RT-3DE) and left atrial tra... Objective To evaluate left atrial function in essential hypertension patients with different patterns of left ventricular geometric models by real-time three-dimensional echocardiography (RT-3DE) and left atrial tracking (EAT). 展开更多
关键词 essential hypertension left atrial function three-dimensional echocardiography left atrial tracking
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Effects of terlipressin on systolic pulmonary artery pressure of patients with liver cirrhosis: An echocardiographic assessment
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作者 Engin Altintas Necdet Akkus +3 位作者 Ramazan Gen M.Rami Helvaci Orhan Sezgin Dilek Oguz 《World Journal of Gastroenterology》 SCIE CAS CSCD 2004年第15期2278-2280,共3页
AIM:Portopulmonary hypertension is a serious complication of chronic liver disease.Our aim was to search into the effect of terlipressin on systolic pulmonary artery pressure among cirrhotic patients. METHODS:Twelve p... AIM:Portopulmonary hypertension is a serious complication of chronic liver disease.Our aim was to search into the effect of terlipressin on systolic pulmonary artery pressure among cirrhotic patients. METHODS:Twelve patients(6 males and 6 females)with liver cirrhosis were recruited in the study.Arterial blood gas samples were obtained in sitting position at rest.Contrast enhanced echocardiography and measurements of systolic pulmonary artery pressure were performed before and after the intravenous injection of 2 mg terlipressin. RESULTS:Of 12 patients studied,the contrast enhanced echocardiography was positive in 5,and the positive findings in contrast enhanced echocardiography were reversed to normal in two after terlipressin injection.The mean systolic pulmonary artery pressure was 25.5±3.6 mmHg before terlipressin injection,and was 22.5+2.5 mmHg after terlipressin(P=0.003).The systolic pulmonary artery pressure was above 25 mmHg in seven of these 12 patients. After the terlipressin injection,systolic pulmonary artery pressure was<25 mmHg in four of these cases(58.3% vs 25%,P=0.04). CONCLUSION:Terlipressin can decrease the systolic pulmonary artery pressure in patients with liver cirrhosis. 展开更多
关键词 Blood Pressure ADULT Antihypertensive Agents ECHOCARDIOGRAPHY Female Humans Liver Cirrhosis Lypressin derivatives Male Middle Aged Pulmonary Artery
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内燃机表面的振动噪声 被引量:1
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作者 袁兆成 史广宝 李轫 《吉林工业大学学报》 CSCD 1997年第3期6-11,共6页
以492Q汽油机为例,对其表面噪声分布进行了比较详细的试验分析,绘制了该机上表面、左右侧表面和前端面的噪声三维分布图,并结合测点的声压频谱图对各表面产生振动和噪声的根源进行了分析。
关键词 内燃机 振动 表面噪 频谱
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