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In 1961 they published the first carrier will be injected into the semiconductor PN junction to achieve the "injection laser" exposition and demonstration in the tunnel diodes as high as in Jane and the PN junction to achieve population inversion (which is Produced by stimulated emission of the necessary conditions for) the possibility, but also that active high-density areas around the most active carrier of the border areas on both sides of the refractive index of a difference, creating optical waveguide effect.

他们又于1961年最先公开发表将载流子注入半导体PN结以实现"注入激光器"的论述，并论证了在如隧道二极管中那样高度简并的PN结中实现粒子数反转(这是产生受激发射的必要条件)的可能性，而且还认为有源区周围高密度的多数载流子造成有源区边界两边的折射率有一差值，因而产生光波导效应。

The rotation was stable during that period. The coma morphology can be interpreted by the model with one nucleus and two active regions. The two-nuclei model is not necessary to be introduced.

模拟表明只用一个彗核和两个源就可以解释观测到的彗发结构，不需要加入双核等因素。

In order for any process to take place it is necessary for the system to pass through an active state.

为了使任何过程发生，就需要使该系统通过一个活化状态。

So it is necessary to explore the real time changes of active substances in order to comprehend the life.

因此，要真正了解生命，必须了解生物各种活性物质的实时变化。

Thereby, with the establishing and developing of market economy, while people pay more and more attention to the transaction security and order, credits are facing enormous challenge. So it is necessary to provide more safety to the activeness.

因此，随着市场经济的建立和完善，交易安全和交易秩序越来越受到人们的关注，诚信面临巨大的挑战的情况下，需要给动的安全以更多的保护。

To 90 minutes of physical activity may be necessary.

可能需要60到90分钟的身体运动。

Now, if the actualist is right in claiming that

这是一个an aposteriori necessary truth。

But in actuality, it is not necessary to change our feelings in order to take action.

但实际上，它不是要改变我们的感情，以便采取行动。

To actuate all valves it is necessary to provide certain data to assure proper sizing and prevent damage to the system.

为了驱动所需的阀门，有必要提供某些参数，以保证能够恰当选择所需的执行机构，防止损坏系统。

Several parammeters contribute to the determination of the force necessary to actuate the relay, among them

有几个参数决定了激励继电器所需的强度，其中包括

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。