Research and Development of Plasma-based Low-energy Ion Implantation;
等离子体基低能离子注入技术的研究与发展
Plasma-based low-energy ion implantation, including plasma source ion nitriding and plasma source ion carburizing, has been emerged as a low-temperature, low-pressure modification approach for steel.
等离子体基低能离子注入是一种钢的低温、低压表面改性方法，它包括等离子体源离子渗氮和等离子体源离子渗碳两种工艺等离子体基低能离子注入的主要传质机制是低能离子注入一同步热扩散，即在低脉冲负偏压作用下的离子首先完成不依赖于工艺温度的低能离子注入，然后己注入的原子在较低的工艺温度下发生足够的热扩散等离子体热扩散吸收具有补充的传质作用，但由于工艺温度较低，这种作用很小连续的热扩散过程有利于改善注入吸收条件，等离子体湮没也可以防止已注入原子的反向逸出，二者对传质过程具有促进作用。
Taking advantage of the complex interplay between low-energy ion beam and organism,the process is intended to improve,modify and reconstruct the genetic materials in the cells,which is a great breakthrough in the genetic improvement and gene transfer of crops and microorganism,thus paving the way for ion beam bioengineering.
20世纪80年代中期,我国科学家发现了离子注入生物学效应,并以低能离子与生物体之间存在复杂的相互作用为基础,有目的地对生物体内的遗传物质进行加工、修饰、重组,开辟了农作物、微生物的遗传改良及转基因的新途径,由此开创了离子束生物工程学的先河。
16 cm diameter low energy broad beam ion source;
16厘米低能强流宽束离子源
In the paper a series of multicusp low energy broad beam ion sources are described.
由于采用新型多会切磁场和优化的引出系统,该系列源在薄膜辅助沉积的能量(200~1000eV)范围内,具有良好的低能特性和束流分布均匀性,可使用反应气体或惰性气体工作。
The microstructure and mechanical properties of 1 250 MPa grade new type bainite wear resistance steel plate were studied as hot rolling and low temperature tempering.
研究了热轧、低温回火状态1 250 MPa级新型贝氏体耐磨钢板的组织和力学性能,测试了埋弧焊和CO2焊焊接接头的力学和机械加工性能。
Throught several powerful shot peening contrast tests of carbonitriding gears,the effect of powerful shot peening with different parameter,and the influence of low temperature tempering to contact fatigue strength of bearing surface were researched.
通过对碳氮共渗齿轮试片进行了多次强力喷丸试验 ,研究了不同喷丸参数下的强力喷丸的效果及喷丸后的低温回火处理对提高齿轮试片表面接触疲劳强度的影响。
A kind of low temperature tempering treatment is designed to increase the hardness of 50CrV steel.
设计了低温回火工艺 ,使 5 0CrV钢的硬度提高 。
Of less than normal intellect.
低能的低于正常智力的
high-and-low-energy wet scrubber
高能及低能湿式洗涤器
Saturnian low-energy thermal plasmas
土星低能热等离子体
low-energy electrostatic photoelectron spectrometer
低能静电光电子谱仪
low-energy X-ray space detector
低能x射线空间探测器
Great stupidity or foolishness.
愚蠢极大的愚蠢或低能
He was Born suBnormal and will never learn to speak.
他天生低能，学不会讲话。
Low Energy & Low Emission Cement with High Performance & Low Hydration Heat and Its Concrete Application
低能耗、低排放、高性能、低热硅酸盐水泥及混凝土的应用
could detect only the merest whisper.
只能听到低低的私语
She had to duck her head to get through the low doorway.
她不得不低下头才能穿过低矮的门口。
Can you take 5 pounds off the price?
你能把价钱降低5镑吗？
Can you lower the light a little?
你能把灯放低一些吗?
Possibly fromMiddle Low German.
可能源自中古低地德语。
Water reduces the potency of vodka.
水能降低伏特加的强度。
low stacking fault energy crystal
低堆垛层错能的晶体
low in price, But good in function (performance)
价格低廉，性能良好
lowest acceptable rate of return
能接受的最低收益率
Disappointment could only create bad feeling.
失望只能使情绪低落。