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在超声
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  under ultrasound
     Under ultrasound irradiation, the pinacol coupling of aromatic aldehydes with Mn-NH 4Cl or Mn-MnCl 2 in aqueous THF was achieved in 30%~95% yields at room temperature for 2~3 h.
     在超声辐射下 ,Mn NH4Cl THF∶H2 O ( 1∶4,V∶V)或Mn MnCl2 THF∶H2 O ( 1∶4,V∶V)体系中 ,于室温 2~ 3h内可使芳香醛还原偶联成邻二醇 ,收率为 3 0 %~ 95 % .
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     To establish VX 2 liver cancer model in rabbit, the VX 2 tissue was cut into strip shape about 1 mm×1 mm×3 mm, and were inoculated into the liver of 60 New Zealand rabbits guided under ultrasound. The successful rate of the animal model were observed 2 weeks later.
     为研制适合于超声等影像学监测和介入治疗研究的肝癌动物模型 ,将兔后腿肌肉内的 VX2 肿瘤组织剪成 1 mm× 1 mm× 3 mm条状瘤块 ,在超声引导下将 VX2 肿瘤块接种60只新西兰白兔肝脏 ,2周后测定新西兰白兔肝肿瘤接种成功率。
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     Different doses of ~(90)Y glass microspheres weres injected into the livers of rabbits under ultrasound guidance to observe the distribution of isotope in the body and the histologic alteration in the liver.
     在超声引导下将不同剂量~(90)Y玻璃微球(~(90)YGM)注入兔肝内,以观察局部注射后同位素的体内分布及注射区肝脏的组织学变化。
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     Part2:Studies on Cannizzaro reaction of aromatic aldehydes under ultrasound.
     第二部分:在超声辐射下,对芳香醛的Cannizzaro反应进行了研究,取得了比较满意的结果。
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     We firstly studied Knoevenagel condensation of malononitrile with aromatic aldehydes catalyzed by Montmorillonite K10-ZnCl_2 under ultrasound irradiation to synthesize arylmethylenemalononitrile.
     在超声辐射下,由蒙脱土K10/ZnCl_2催化的丙二腈和芳醛缩合生成芳亚甲基丙二腈的反应,在2~10min完成,并得到较高收率的Knoevenagel缩合产物。 此方法具有操作简便,催化剂价廉易得、活性高、对环境友好、可回收重复使用等优点。
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     Under the conditions of ultrasound intensity 4.97 W/cm~2, H_2O_2 initial concentration 300 mg/L,catalyst dosage 1 g/L and the temperature 30 ℃,the higher efficency of phenol degradation can be achieved in ultrasound/H_2O_2/CuO compared with other catalytic systems.
     在超声声强4.97 W/cm2、H2O2加入量300 mg/L、催化剂的加入量均为1 g/L、溶液温度30℃的处理条件下,3种体系中超声/H2O2/CuO组合对苯酚的去除效果最好。
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     Results The thrombolysis rate was improved in the thrombi clotting for 2 h, 6 h and 12 h with the ultrasound insonation of 10 min(P<0.05)and in those clotting for 2 h with the insonation of 10 min, 20 min, 30 min and 60 min(P<0.01).
     结果凝龄2,6,12h的体外血栓在超声辐照10min条件下,溶栓率显著提高(P<0.05); 超声辐照凝龄2h的体外血栓10,20,30,60min,溶栓率显著提高(P<0.01)。
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     Multiphoton Ionization and Dissociation of Mn_2(CO)_(10) in a Supersonic Molecular Beam
     在超声分子束条件下Mn_2(CO)_(10)的多光子电离解离
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     Objective To evaluate the ultrasonic manifestation of the gallbladder tension and bladder wall thickness in diagnosis of acute cholecystitis.
     目的探讨和完善急性胆囊炎的超声表现特点,明确早期急性胆囊炎胆囊张力与胆囊壁厚度在超声诊断中的价值。
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     Nanosized WO3 particles were prepared by CTAB/C4H9OH/C6H12/aqueous solution dissolved with Na2WO4 or HCl under ultrasonic processing condition.
     在超声振荡条件下,将两份分别增溶有Na2WO4和HCl水溶液的十六烷基三甲基溴化铵(CTAB)/正丁醇(C4H9OH)/环己烷(C6H12)的微乳液进行混合反应,制备了WO3纳米粒子.
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  相似匹配句对
     Ultrasonic Flowmeters
     超声流量计
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     Ultrasonics for Testing
     检测超声
     The Value of High-frequency Ultrasound in Diagnosing Mumps
     高频超声流行性腮腺炎的应用
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     Recent Development of Ultrasonic Motors
     超声电机国外的发展
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  under ultrasound
Interaction between Ti-gel and silver, copper, as well as nickel compounds under ultrasound irradiation
      
The interactions of Ti-gel with silver, copper and nickel ions under ultrasound irradiation are very different, although these ions can be dispersed very well in titania.
      
aspiration performed under ultrasound guidance revealed purulent fluid in all and 23 were verified surgically.
      
The catheter was inserted into the contralateral internal jugular vein under ultrasound guidance in the remaining four cases.
      
All had protocol renal transplant biopsies performed under ultrasound control at 7 days post-transplant, and those with DGF had further biopsies weekly until the graft functioned.
      
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The electroencephalogram of the toad was found to be composed of a 2—6/sec slow rhythm and low voltage (10—20 μV), 12—18/sec fast waves. Irradiation of the brain with ultrasound (250 watts, 24 Kc) for three minutes could abolish or greatly depress the fast component of the electroencephalogram and leave the slow component essentially unaffected. The fast waves, however, would recover if the period of irradiation did not exceed three minutes. Prolonged exposure of the brain to ultrasound resulted in irreversible...

The electroencephalogram of the toad was found to be composed of a 2—6/sec slow rhythm and low voltage (10—20 μV), 12—18/sec fast waves. Irradiation of the brain with ultrasound (250 watts, 24 Kc) for three minutes could abolish or greatly depress the fast component of the electroencephalogram and leave the slow component essentially unaffected. The fast waves, however, would recover if the period of irradiation did not exceed three minutes. Prolonged exposure of the brain to ultrasound resulted in irreversible EEG changes. The depression of the fast component of EEG under the present conditions could not be attributed to the heat effect of the ultrasound, since the deliberate elevation of the brain temperature by some other means to a degree comparable to that produced by the ultrasound (about 1—2℃) failed to reproduce the EEG changes. Nor could it be interpreted as due to the vascular changes of the brain resulting from the ultrasonic irradiation, since direct observation of the brain surface with a dissecting microscope could not reveal any detectable change in caliber of the blood vessels during irradiation. It was thus concluded that the deleterious mechanical effect of the ultrasonic vibrations on the brain tissue was probably responsible for the observed EEG changes.

(一)蟾蜍的脑电图有快慢两种波型,快波的頻率为每秒12—18次,振幅为10—20微伏,慢波的頻率为每秒3—6次,振幅在30微伏以上,通常以快波为主。 (二)用輸出功率250瓦、頻率24千赫茲的超声波透射3分钟,可使蟾蜍脑电图受到阻抑,表現为快波減弱或完全消失,仅殘存不規則的慢波,但在超声停止作用后45分钟之內即行恢复。延长超声波透射的时間,則可使脑电图出現不可逆的变化。 (三)上述剂量的超声波,仅使蟾蜍脑温增高1—2℃,脑表层血管的血流状态和口径无任何可見的变化。 (四)用外部加温法使蟾蜍脑温自24℃增至35℃时,脑电图无显著变动。 (五)超声波对脑电图的阻抑性影响,不能以其热作用加以解释,可能是其机械作用所致。

This paper illustrated experimental study on the influence of ultrasonic vibration upon microstructure and emanation process of saturated rocks. It was found by scanning electron microscope observation that specimens under ultrasonic vibration, whether on the ultrasonically irradiated sides or on the non-ultrasonically irradiated sides, all show a large number of fissured traces, i. e. microcracks. So it can be inferred that under the ultrasonic vibration the development of microcracks provided an outward-diffusing...

This paper illustrated experimental study on the influence of ultrasonic vibration upon microstructure and emanation process of saturated rocks. It was found by scanning electron microscope observation that specimens under ultrasonic vibration, whether on the ultrasonically irradiated sides or on the non-ultrasonically irradiated sides, all show a large number of fissured traces, i. e. microcracks. So it can be inferred that under the ultrasonic vibration the development of microcracks provided an outward-diffusing "passage" for the sealed radon to take part in the emanation process.The results of the ultrasonically vibrating experiments indicate that the ultrasonic vibration made the amount of radon separating-out of rock obviously increased, and the amount would be as much as it was before vibration when the vibration stopped. The increment of separating radon depends on the times of ultrasonic vibration. These results obtained are consistent with the scanning electron microscope observation showing that the primary rock structures were certainly destroyed by ultrasonic vibration. During each vibration, new cracks appeared and the separating amount of radon was also increased correspondingly. For the first vibration, the amount of radon increased by a factor of 4.5 under the temperature-control condition (it will be 4.3 under temperature-uncontroi event). For the fourth vibration, it increased by a factor of 9.1 under temperature-control condition (it will be 11.2 under temperature-uncontroi condition). Among the increment of radon, absorbed radon accounts for 64-76 percent, sealed radon accounts for 24-36 percent. The contribution of the ultrasonic thermal effect to the separating radon accounts merely for 10-30 percent.The experiment results show that the rock emanation process was clearly related to the ultrasonic vibration. Its mechanism is rather complicated. It is reasonably considered that prior to the failure of rock the expensive microcracking produced accoustic emission, i. e. ultrasonic vibration, leading to a constant emanation from rocks in a significant amount which may be probably regarded as a precursory information of radon.

本文以实验为基础,得出了如下几点结论:(1)经超声振动的岩石样品,其微结构有明显的变化;(2)超声振动不仅可以破坏吸附氡的束缚状态,还能释放封闭氡;(3)在超声振动下,氡析出量非常可观,有可能作为氡前兆信息的物质基础。

This paper, describes design considerations for expenimentally incorporating high frequency SCR in the pulse generator of ultrasonic pulse-echo medical equipment used for measuring tissue characteristics, explains theoretically correlation and mutual effects of different parts of this device, and introduces and discusses formulas for the choice of various components. These considerations are also applicable to the design of other ultrasound instruments using the SCR.

本文叙述了教学实验中在超声脉冲回声组织特性测量装置脉冲发生器中应用高频可控硅的设计考虑,从理论上说明该装置各部件间的相互关系和影响,介绍和讨论了选用各元件的计算公式。这些考虑对应用可控硅的其他超声仪器的设计也是适用的。

 
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