For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope.
比如，与焦距为1000mm的望远镜相比，2000mm焦距望远镜的放大率和视场范围分别是前者的2倍和1/2。
By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
National focal points often have limited authority and very little access to a country's true power base.
国家归口单位的权限往往十分有限，极少可以接近国家的真正权力基础。
The effects on kerf width and quality made by laser facula diameter, focal point position, cutting speed, laser power and other technological parameters were studied.
研究了激光光斑直径及离焦量、切割速度、激光功率等工艺参数对齿轮切缝宽度及加工质量的影响。
CO2 lasers is conducted to cutting die - board with the aim of discussing the relationship between cutting depth and parameters such as laser power, cutting speed and focal position.
采用CO2激光切割模切板，研究激光功率、切割速度、焦点位置等参数和切割深度之间的相互关系，研究如何确定最大切割速度和优化切割速度。
Crater depth versus pulse power density, average laser power, pulse repetition frequency and focal distances are built up through experiment.
试验建立起了凹坑深度与脉冲功率密度、激光平均功率、脉冲重复频率和离焦量之间的关系曲线。
When a target is placed in the focal plane of a focused aperture antenna, the backscattered power from the target may be greatly enhanced by properly choosing the aperture distribution.
当目标处于聚焦天线焦平面上时，可通过选择口径分布来提高目标的后向散射功率。
The important factors for laser depth-microdrilling are the sufficient power density, suitable focal length, determination of the best image plane and refocusing etc.
足够的功率密度、用适当的焦距并确定最好象面、再聚焦方法等是激光深微孔加工的重要因素。
Administrative emergency power is an important part of the state emergency power and is the focal point in emergency law.
行政紧急权力是国家紧急权力中的重要部分，是紧急状态法制的核心问题。
Wide-Angle lens: lens with wide covering power. It has a focal length which is less than the diagonal of the film format with which it is being used.
广角镜头：覆盖范围广阔的镜头。它的焦距长度短于所用菲林格式的对角线长度。
Adopting noise initiation mode of stimulated Brillion scattering (SBS), the influence of focal length on optical limiting power and energy is numerically simulated.
采用受激布里渊散射(SBS)噪声起源理论模型，数值模拟了透镜焦距对SBS光限幅功率特性和能量特性的影响。
The gas turbine generating sets for co-production of power and heat is introduced as a focal point.
重点介绍了利用燃气轮机组实现热电联供。
Conclusion Low power laser irradiation in nasal cavity can improve the focal rCBF and cerebral function of the patients with brain infarction, which is similar to that of the ILIB.
结论低强度激光鼻腔内照射能改善脑梗死患者局部病灶脑血流量，激活脑细胞功能，有着较为广泛的临床应用前景。
In that case, Fourier transform system with long focal length and high power lens and method of linear decision are proposed.
以肺癌细胞筛选为例，提出用长焦距、高倍率的傅里叶变换系统和线性判别处理。
This method is simple and practical, it is applicable especially for the measurement of thermal focal length of high power laser.
此方法简单可行，特别适用于高功率激光器热焦距的测量。
The experiment shows that the higher the pump power is, the smaller the thermal focal length is, and the worse the thermal effect influent the output beam quality.
实验结果表明，抽运功率越高，热焦距越小，热效应对输出光束质量影响越严重。
With SOPC technology uncooled focal plane infrared(IR)imaging system has smaller size, lower power consumption and better performance.
采用SOPC技术可使非制冷焦平面红外成像系统体积更小、功耗更低、性能更稳定。
And measure the thermal focal length of the material on the work in certain input power and output power.
并且，在一定的输入功率下，对工作物质的热焦距进行测量。
Seizure control:Acute focal epilepsy could be effectively controlled when the thermocoagulation power and duration is 4U/1S.
癫痫控制情况：在4U/1S组的热凝，能有效地控制急性局灶性癫痫。
The result power spectrum analyses of focal spot show that the smoothing effect is caused by middle and high frequency intensity suppression.
对焦斑点功率谱的分析表明谱色散平滑通过抑制焦斑中高频的频谱强度达到平滑效果。
In order to reduce power consumption of uncooled infrared focal plane arrays, the readout circuit of temperature stabilizer eliminated thermoelectric coolers (TEC) was studied.
为了降低非制冷红外焦平面阵列的功耗，研究了去除热电制冷器(TEC)等温度稳定装置的读出电路。
In order to reduce power consumption of uncooled infrared focal plane arrays, the readout circuit of temperature stabilizer eliminated thermoelectric coolers (TEC) was studied.
为了降低非制冷红外焦平面阵列的功耗，研究了去除热电制冷器(TEC)等温度稳定装置的读出电路。
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