查询词典 positrons

However, it is unclear whether these positrons can escape from the stellar debris in sufficient quantity to explain the size of the observed cloud.

然而，尚不清楚是否有足够数量的正电子能够逃离恒星残骸以解释观察得到云团的大小。

Some astronomers have suggested that exploding stars could produce the positrons.

一些天文学家猜测爆炸的恒星能够产生这些正电子。

Beta particles are either electron s or positrons.

粒子可以是电子或正电子。

Indeed, the team found that, at the highest energies they could measure, the ratio of positrons to electrons was far higher than at lower energies.

实际上，该研究团发现，在他们所能测量的高能范围内，正电子与电子的比例要比低能范围内的高得多。

At lower temperature, positrons detected also negative ions as positron shallow traps.

另外，在低温下形变样品中还存在正电子浅捕获态。

After that, they discovered high- energy positrons — the Grande Latte'' of subatomic particles – which, they deduced, must have been produced from dark matter.

在此之后，他们发现高能量正电子-的大铁''的亚原子粒子-其中，他们推断，必须从已生产出了暗物质。

The longest lifetime component in PALS results is ascribed to the annihilation of positronium in cavities of PS sample. It is found that 80% of the positrons implanted in PS film have formed positronium atoms. PALS results show that the lifetime of ortho-Positronium has small value when the sample was in oxygen gas medium compared with those in other medium.

正电子湮没寿命谱测试结果表明，样品中存在长达40ns的电子偶素湮没成分，并且进入多孔硅膜层的正电子约有80%形成电子偶素，具有非常高的电子偶素产额；在氧气气氛下，由于气体导致o-Ps发生自旋转化猝灭是使多孔硅样品中电子偶素寿命缩短的主要原因。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。