空

The converter can be improved just by exchanging the position of the resonant inductance and the transformer such that the transformer is connected with the lagging leg. The improved converter has several advantages over its counterpart, e.g., the clamping diodes conduct only once in a switching period, and the resonant inductance current is smaller in zero state, leading to a higher efficiency and reduced duty cycle loss. The operation principle of the improved converter and the comparison with the original converter are analyzed in this paper. The effect of the blocking capacitor in series with the transformer or resonant inductance is discussed, and a best scheme is determined.The improved converter is adopted to design the DC/DC converter of secondary power supply in HVDC power system.

本文将谐振电感和变压器交换位置，使变压器与滞后桥臂相连，这样箝位二极管在一个开关周期中只导通一次，同时零状态时谐振电感电流较小，有利于提高变换效率和减小占空比丢失，本文分析改进后变换器的工作原理，并与改进前的变换器进行对比，讨论隔直电容在不同位置对变换器工作的影响，确定一种最佳工程方案。

The aroma components of blood orange fruit were extracted by headspace solid phase microextraction and investigated by gas chromatography-mass spectrometry with two GC columns of different polarity(HP-5 and DB-WAX).

采用顶空固相微萃取对血橙的香气成分进行提取，用两个不同极性的色谱柱(HP-5和DB-WAX)进行分离，利用气相色谱-质谱联用技术对香气成分进行分析。

Naive as Einstein never lose the bubbles blow, in the land of deep space, and constantly rising and bursting.

像永不失天真的爱因斯坦吹出的肥皂泡，在空冥的大地上，不断破灭又不断上升。

There they must face the blubbery monster Buyon, a hideous beast with only one thing on his mind, turning Goku into his next meal!

这样一来，他俩将不得不面对浑身肥肉的吸血怪。这个可怕的怪物满脑子只想着做一件事，就是把小悟空变成自己的下一顿美餐。

Very interesting that we found in this main board a lot of empty spot.

非常有意思的是，我们在这款主板上发现了很多空焊点。

The usually crowded boardwalk was deserted except for two people.

平时拥挤的木板人行道上只有两个人，空寂寂的。

Actually, the boathouse is empty.

事实上，船屋是空的。

Gray, following close behind me, had cut down the big boatswain ere he had time to recover from his lost blow.

紧跟在我身后出来的格雷，不等那大块头水手长刀子劈空后回过神来，就将他砍倒在了地上。

Check and bock all VIP rooms and prior to arrival.

在客人到达前，所有重要客人房间都必须经过检查并空出。

Based on the Boltzmann equation, governing equations are obtained by microscopic kinetic theory, in which the terms for mass and momentum transportations can be obtained directly by introducing some conclusions of bubble dynamics.

在推导过程中，结合空泡动力学中的研究成果，从微观角度考虑了泡径变化引起的质量和动量输运，直接推导出了相间输运源项。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。