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Evaluating Arterial Stiffness in Type 2 Diabetes Patients Using Ultrasonic Radiofrequency 被引量:1
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作者 李朝军 刘阳 +1 位作者 杜联芳 罗向红 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2016年第3期442-448,共7页
Differences in arterial stiffness between the two sides of the carotid arteries were investigated using ultrasonic radiofrequency in 88 patients with type 2 diabetes and 70 controls. The compliance coefficient(CC), ... Differences in arterial stiffness between the two sides of the carotid arteries were investigated using ultrasonic radiofrequency in 88 patients with type 2 diabetes and 70 controls. The compliance coefficient(CC), pulse wave velocity(PWV), intima-media thickness(CIMT) and diameter(CCAD) of the common carotid arteries(CCAs) were measured. The ratio of the left to right CCAs was calculated to provide four indexes: CC ratio, PWV ratio, CIMT ratio and CCAD ratio. In the diabetes group, the PWV on the left side was significantly higher than that on the right side, while the CC on the left side was significantly lower than that on the right side. The bilateral CIMT was thicker and CCAD was wider, the left PWV traveled faster, and the right CC was higher in the diabetes group than in the control group. The PWV ratio between the two groups was significantly different and correlated positively with duration of diabetes and systolic blood pressure(SBP). The differences between the two sides of CCAs in patients with diabetes suggested that disease duration and SBP were important risk factors for arterial stiffness. Identifying the difference could potentially lead to the much earlier diagnosis of arteriosclerosis. 展开更多
关键词 type 2 diabetes intima-media thickness stiffness pulse wave velocity
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Experimental Investigation of a Single-Stage Four-Valve Pulse Tube Refrigerator
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作者 王坤 鲁雪生 顾安忠 《Journal of Shanghai Jiaotong university(Science)》 EI 2007年第1期96-99,105,共5页
In order to simplify the structure of the cold end of the pulse tube refrigerator (PTR) and have a better utilization of the cold energy of the system, a one-stage four-valve pulse tube refrigerator (FVPTR) with an &q... In order to simplify the structure of the cold end of the pulse tube refrigerator (PTR) and have a better utilization of the cold energy of the system, a one-stage four-valve pulse tube refrigerator (FVPTR) with an "L" type pulse tube structure and two orifice valves at the hot end of pulse tube has been constructed. Verification experiments show that the two orifice valve structure performs better than one orifice valve structure. A lowest temperature of 67.5 K was obtained at a frequency of 2.5 Hz under a system average pressure of 1.5 MPa with 200 mesh bronze screens as regenerator material, 80 mesh copper screens as stuffing material of heat exchanger. Due to the difficulty in manufacturing the thin "L" type pulse tube, the wall thickness of the pulse tube in the experiment was relatively difficult for us to reach 0.5 mm as that of the ordinary pulse tube, which resulted in relatively big system loss and affected the minimum temperature of the system to some degree. 展开更多
关键词 pulse tube refrigerator(PTR) "L" type pulse tube two orifice valves experimental investigation
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PRI modulation recognition and sequence search under small sample prerequisite 被引量:2
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作者 ZHANG Chunjie LIU Yuchen SI Weijian 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第3期706-713,共8页
Pulse repetition interval(PRI)modulation recognition and pulse sequence search are significant for effective electronic support measures.In modern electromagnetic environments,different types of inter-pulse slide rada... Pulse repetition interval(PRI)modulation recognition and pulse sequence search are significant for effective electronic support measures.In modern electromagnetic environments,different types of inter-pulse slide radars are highly confusing.There are few available training samples in practical situations,which leads to a low recognition accuracy and poor search effect of the pulse sequence.In this paper,an approach based on bi-directional long short-term memory(BiLSTM)networks and the temporal correlation algorithm for PRI modulation recognition and sequence search under the small sample prerequisite is proposed.The simulation results demonstrate that the proposed algorithm can recognize unilinear,bilinear,sawtooth,and sinusoidal PRI modulation types with 91.43% accuracy and complete the pulse sequence search with 30% missing pulses and 50% spurious pulses under the small sample prerequisite. 展开更多
关键词 inter-pulse slide pulse repetition interval(PRI)modulation type bi-directional long short-term memory(BiLSTM)network sequence search
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