摘要 :
The topology and the control strategy of a novel sinusoidal very low frequency (VLF) high voltage generator are introduced in this paper. To minimize the influence of distributed parameter of High Frequency High Voltage transforme...
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The topology and the control strategy of a novel sinusoidal very low frequency (VLF) high voltage generator are introduced in this paper. To minimize the influence of distributed parameter of High Frequency High Voltage transformer, Series-parallel (LCC) resonant technology is applied to reduce the impact of the distributed parameters, decreasing the power loss and the volume of the transformer. The Closed-Loop control technology is adopted to reduce the influence by the combination of changing duty cycle and operating frequency. Simultaneously, the principle ofsegmental data processing is proposed to obtain different steady state operating points, greatly reducing the calculation of the Microcontroller Unit (MCU), improving the control accuracy. As a result, it was accomplished by MCU successfully. The test of the 35kV/0.1Hz power supply has been taken on a capacitor (1.5uF) which is equivalent to the XLPE cable on electrical character. Total harmonic distortion is less than 1% which can meet IEEE400.2 standard well. The results of the experiment verify the accuracy and feasibility of the control theory and the topology.
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摘要 :
We described the formation of self-organized two-dimensional (2D) assemblies of W-(2,3,5,6-tetrafluoro-4-iodophenyl)hexadecylamine and 1-dodecyl-imidazole at the liquid/HOPG interface. The two-dimensional assemblies showed a fishb...
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We described the formation of self-organized two-dimensional (2D) assemblies of W-(2,3,5,6-tetrafluoro-4-iodophenyl)hexadecylamine and 1-dodecyl-imidazole at the liquid/HOPG interface. The two-dimensional assemblies showed a fishbone-like pattern structure as revealed by high-resolution scanning tunneling microscopy. Although different interactions can drive the formation of 2D assemblies, as far as we know, this is the first report on halogen bond-driven 2D assemblies.
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摘要 :
Conclusion EVS is an important method for the treatment of esophagogastric variceal bleeding. Objective To evaluate the efficacy of endoscopic variceal sclerotherapy(EVS)for esophagogastric Variceal bleeding. Methods A retrospecti...
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Conclusion EVS is an important method for the treatment of esophagogastric variceal bleeding. Objective To evaluate the efficacy of endoscopic variceal sclerotherapy(EVS)for esophagogastric Variceal bleeding. Methods A retrospective analysis was made on 1010 patients with esophagogastric variceal bleeding who Underwent sclerotherapy, among whom there were 834 patients with cirrhosis, 160 with hepatocarcinoma, 12 with Budd-Chiari syndrome and 4 with congenital liver fibrosis. Totally, 3203 sessions of sclerotherapy were performed, including 602 sessions of emergency sclerotherapy and 2601 of selective surgery.
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