查询词典 laboratory experiment

The Kibo laboratory segment that was deployed during space shuttle Discovery's trip to the ISS can be pressurized and contains racks of scientific experiment that will be used to explore how plants brace themselves against gravity and how water might be inhibited from freezing in cells under microgravity, as well as other experiments.

这一节在发现号航天飞机抵达国际空间站时展开的Kibo实验舱可以加压并进行一系列的科学实验，诸如研究植物如何对抗重力的作用反向生长，以及在微重力的情况下如何抑制细胞中的水结冰等等实验。

The Kibo laboratory segment being deployed during space shuttle Discovery's trip to the ISS can be pressurized and contains racks of scientific experiment that will be used to explore many things, including how plants brace themselves against gravity, and how water might be inhibited from freezing in cells under microgravity.

希望号试验舱的部分组建在发现号航天飞机此次国际空间站之旅展开的，舱内可以增压，并包含被用来研究许多新事物的科学仪器，其中包括植物如何逆重心生长，以及在微重力状态下细胞内的水分如何抑制凝结。每一条走过的路，都有它不得不这样蜿蜒盘旋的理由。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state. It is cheap and can be combined with the comb laser system in my laboratory.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁，其优点在於自制的外腔雷射之费用非常便宜，也有不错的输出功率，同时在实验中我利用市售的电子零件制作了一台脉冲产生器，可控制输出的频率、脉冲宽度以及相对的相位，且可同时控制四套需要TTL脉冲控制的系统或仪器，优点除了便宜之外，也非常稳定；为了隔绝磁场，利用了磁场隔绝金属箔，我也在实验室中建立了一组气体放电系统，其系统可以用脉冲产生器来控制开关时序，最后，我建造了一个氦原子能阶的量测系统，而且费用低廉，可与本实验室的另外一门研究光梳雷射系统做结合。

Two works guaranteed the fulfilment of this studies,(1)developing compressional - and shear - waves transducers with broadband which is key part of the system in the physics model experiment, and study of the special property and using skills of the transducers , groping the relative experience to develop transverse wave measurment and observation at laboratory.(2) establishing a suit of comprehensive testing system to observe the elastic wavefield in anisotropy media .

首先通过研制物理模型实验技术中的关键器件纵横波宽频带换能器，及对其性能和使用技巧的研究，积累实验室开展各向异性介质的测试经验，建立了一套较完整观测各向异性介质弹性波场的测试系统。

A laboratory incubation experiment was carried out to investigate effects of application of Chinese milk vetch shoot, black locust leaves, and pea stalks on acidity of an Ultisol from a tea garden, as affected by nitrogen transformation in these organic materials. Results show that the application increased soil pH to a varying extent compared with control.

采用室内培养试验方法研究了添加紫云英、刺槐叶和豌豆秸秆对酸性茶园红壤酸度的改良作用，探讨了培养期间豆科植物中氮形态转化对土壤酸度改良效果的影响。

Then a model to distinguish skin drag coefficient and form drag coefficient is established based on a floe drag experiment by using a wave-current tank in laboratory, and the quantitative relationship between skin/form drag coefficient and floe geometric parameters is established as a result.

水拖曳系数同海冰几何形态参数的关系才是提高拖曳系数适应性和准确性的最佳途径。

Search experiment at the Soudan Underground Laboratory, Minnesota, USA. A total

第一个新闻，其实已经有点老了，就是CDMS发现了暗物质粒子的迹象。

This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield,the pulse length and time jitter of the produced photon pulse were predicted theoretically from the parameters of the electron bunch and the laser pulse,and the scattering angle. Preliminary experiments were successfully carried out with a 16 MeV backward-traveling-wave accelerator and the ns-Q switched laser provided by China Academy of Engineering Physics. This paper also introduces the 1.6-cell electron gun that was fabricated on site and the experiment with high RF power including the measurement of the electron bunche parameters. Based on these,we have designed an X-ray source,which is now under construction.

介绍了清华大学加速器实验室近年来关于汤姆逊散射超短X射线源的研究工作；研究了在任意散射角度下电子束参数和激光束参数对散射光子参数的影响，给出了散射光子的参数如光子产额、脉冲长度、时间抖动等与电子束参数、激光束参数和散射角度的关系；利用实验室已有的16 MeV反波行波加速器与中国工程物理研究院激光聚变研究中心提供的ns调Q激光搭建了汤姆逊散射初步实验平台并开展了实验研究；加工了1.6-cell光阴极微波电子枪，搭建了高功率实验平台，对产生的电子束参数进行了初步测量；对汤姆逊散射超短X射线源进行了设计并开展了相关的平台建设工作，对产生的X射线脉冲参数进行了模拟。

It took Cockcroft and Walton five years to build a machine that worked. Finally, in April 1932, they had a machine that produced a steady stream of hydrogen nuclei with an energy of about half a million volts. They were carefully measuring the quality of the stream, in no hurry to begin doing nuclear experiments. On the morning of April 13, Rutherford came into their room, saw what they were doing, and lost his temper. He told them to stop wasting their time and do some science. The next day, Cockcroft was occupied with other business. Walton was alone in the laboratory, ready to do the first experiment, using his hydrogen nuclei to bombard a target made of the light metal lithium. The result was spectacular. The lithium nuclei were split in two and fell apart into pairs of helium nuclei.

用了五年时间，考克饶夫和华尔顿建造出了第一台能运行的加速器，最终，在1932年，他们制造出了能够提供稳定氢粒子流的加速器，粒子能量大约为50万伏特，他们并没有急着做核试验，而是精心测量了粒子流的性质，4月13日清晨，卢瑟福来到他们的房间，看到他们还在测量，大发雷霆，告诉他们停止浪费时间，开始科学研究，第二天，考克饶夫就被安排了其他事情，只剩华尔顿一个人在实验室里，准备做第一次实验，用他的氢粒子流轰击用轻质金属锂作的标靶，结果极为壮观，锂原子被分裂成两半形成一对氦原子，氦原子释放出的能量比氢原子注入的多达三十倍！

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。