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 低频
 low frequency
 Study on Wideband Electromagnetic Characteristics of Stealth Targets in Low Frequency 隐身目标低频宽带电磁散射特性研究 短句来源 Experimental Study of Promoting Fracture Healing by Low Frequency Pulse Electrical Stimulator Combined with External Fixator 外固定架结合低频脉冲电刺激仪促进骨折愈合的实验研究 短句来源 Study on Polymer Reological Behavior and Structure-properties Prepared Via Low Frequency Vibration Injection Molding 低频振动注射对聚合物流变行为及试样结构与性能的研究 短句来源 Research on Low Frequency UWB-SAR Calibration Technique 低频UWB-SAR校准技术研究 短句来源 LOW FREQUENCY DISLOCATION INTERNAL FRICTION PEAKS WITH ANOMALOUS AMPLITUDE EFFECT IN Al-0.5% Cu ALLOY Al-0.5%Cu合金中表现反常振幅效应的低频位错内耗 短句来源 更多
 low-frequency
 Low-frequency beat noise for gas lasers 气体激光器的低频差拍噪声 短句来源 THE KERNEL FUNCTION METHOD FOR UNSTEADY TRANSONIC FLOW PAST LOW-FREQUENCY OSCILLATING BODIES OF REVOLUTION 绕低频振动旋成体的跨音速非定常流核函数方法 短句来源 THE LOW-FREQUENCY INTERNAL FRICTION ASSOCIATED WITH THE STRUCTURAL RELAXATION AND CRYSTALLIZATION PROCESSES IN THE METALLIC GLASS Fe_4Co_(66)V_2Si_8B_(20) Fe_4Co_(66)V_2Si_8B_(20)金属玻璃结构弛豫和晶化过程中低频内耗的研究 短句来源 THE DESIGN AND FABRICATION TECHNOLOGY OF LOW-FREQUENCY LOW-NOISE HIGH TRANSCONDUCTANCE JFET 3DJ415 低频低噪声高跨导JFET 3DJ415的设计与研制 短句来源 Experimental Investigation on Low-Frequency Noise Mechanism in GaAs MESFET Devices GaAs MESFET器件低频噪声机理的实验研究 短句来源 更多
 lf
 The low frequency (LF), high frequency (HF), ratio of low frequency and high frequency (LF/HF),total power (LF+HF), MAP, HR and SpO_2 were recorded before anesthesia (T0), after intubation (T1), incision of skin(T2), 1 h after the begining of operation(T3), after the completion of operation(T4) and extubation (T5). 监测麻醉前(T0)、插管后5min(T1)、切皮(T2)、手术开始后1h(T3)、术毕(T4)及拔管后(T5)低频(LF)、高频(HF)、低频高频比(LF/HF)和总功率(LF+HF)及MAP、HR、SpO2各值。 短句来源 The results showed that the values of low frequency (LF) and the ratio of low to high frequency (LF/HF) within initial 15 min of myocardial ischemia in survivor or SCD group respectively were significantly higher than those within initial 15 min of sham operated in sham group LF(ms 2/Hz):198.8±41 3 or 226 7±56 4 vs 65.4±19.6,all P <0.01; 结果显示存活组或SCD组大鼠于心肌缺血初始15min内的低频（LF）及低频／高频比值（LF／HF）较假手术组明显升高〔LF（ms2／Hz）：198．8±41．3或226．7±56．4vs65．4±19．6，P均＜0．01； 短句来源 Design of Three-phase Cydoconverter Based on TMS320LF2407A 基于TMS320LF2407A的三相低频电源设计 短句来源 The dielectric spectra of lithium tantalate-niobate crystals(LiTa_xNb_(1-x)O_3,x=0,0.02,0.06,0.59,0.92,1.00)have been investigated in LF and RFranges at room temperature. 研究了钽铌酸锂(LiTa_xNb_(1-x)O_3,x=0,0.02,0.06,0.59,0.92和1.00)晶体在室温的低频和射频介电谱。 短句来源 RESULTS:As compared with those at T0,LFnorm was significantly decreased at T2,T3,T4,T5 and T6 ( P <0.01),LF/HF reduced markedly at T1,T2,T3 and T4 ( P <0.05), but HFnorm,TP,HF and LF were no significant change at group CA. 结果 :与 T0相比 ,CA组标化低频值 (L Fnorm)在 T2 ,T3,T4,T5和 T6均显著降低 (P<0 .0 1) ,L F/ HF在 T1,T2 ,T3和 T4也均显著降低 (P<0 .0 1)。 短句来源 更多
 lower frequency
 Pb-doped Microwave Dielectric Ceramics in BaO-Nd_2O_3-TiO_2 System and Its Lower Frequency Test Experiment Pb掺杂BaO-Nd_2O_3-TiO_2系微波介质陶瓷及其低频测量方法的研究 短句来源 Nano-crystallization and Its Mechanism of Amorphous Alloy Fe_(78)Si_9B_(13) Treated in Lower Frequency Pulse Magnetic Field 低频脉冲磁场致非晶合金Fe_(78)Si_9B_(13)纳米晶化及机制 短句来源 The absorption band edge of the crystal lattice shifts to lower frequency area because of the dopant Co2+, and there is an absorption peak at 1.9THz and the absorption coefficient is more than 70cm-1, the force constant K of F--Co2+ ionic chemical bond stretch vibration calculated from this peak is 3.40×10-2 N/cm. Co掺杂使晶格吸收带边向低频移动,而且MgF2:Co晶体在1.9THz有吸收峰,吸收系数达到70cm-1,求出F--Co2+离子键伸缩振动的键力常数K为3.40×10-2N/cm。 短句来源 The group theory analysis shows that there are 9A_g , 10B_(1g), 11B_(2g), 12B_(3g) Ranam-active modes under approximation of neglecting internal vibration modws of D_2O in CMC. These Raman vibration modes have been measured in lower frequency range. 在忽略结晶水的内振动情况下,群论分析得出9A_g+10B_(1g)+11B_(2g)+12B_(3g),共有42支拉曼振动模,观测到这些振动模在实验中的低频部分。 短句来源 After correcting defocus and astigmatism,the average visual acuity of subjects is 1.0,the CSF value is about 52 for lower frequency 20 c/mm and about 1 for higher frequency 80 c/mm. 矫正了离焦与像散后,被测者的平均视锐度值达到了1.0,对比敏感度在低频(20 c/mm)处约为52,高频(80 c/mm)处约为1; 短句来源 更多

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 low frequency
 It was found that grid turbulence reduced turbulence intensities in the shear layer and suppressed low frequency fluctuation. It was found that grid turbulence reduced low frequency fluctuation of the flame fronts, increased the small-scale wrinkles and elevated the mean temperature of the flame zone. The DACON instrument for studying the convection caused by low frequency microaccelerations aboard spacecraft is described. The Freja data with a high time resolution allow identification of the process of energy transport via a cascade from low frequency waves to high frequency waves accompanied by electron energization. The high light output (80-85 lm/W) at high power of 300-400 W and low frequency of 150 kHz is attained owing to low loss of power (4.5-6.5 W) in the magnetic circuit and inductance coil. 更多
 low-frequency
 The low-frequency terms in the expansion involve an independent fractional Brownian motion evaluated at discrete times or, alternatively, partial sums of a stationary fractional ARIMA time series. These decompositions have a multiscale structure, independent Gaussian random variables in high-frequency terms, and the random coefficients of low-frequency terms approximating the Gaussian stationary process itself. A piezoelectric actuated prestage driver of hydraulic servo valves for the low-frequency response of electrohydraulic servo valve electromagnetic prestage driver was presented. The identification of the geometrical character of a flaw is then given by the two dimensional inverse Born approximation in a low-frequency range. The results obtained indicate that free radicals generated in the field of ultrasonic cavitation play a decisive role in the inactivation of CAT, which takes place when its solutions are exposed to low-frequency ultrasound. 更多
 lf
 Let $0 \neq f\in \mathcal{S}(\mathbb{R}^+).$ We show that Lf(L)δ, the distribution kernel of the operator Lf(L), is an admissible function on G. Solutions of CAT were exposed to LF (20.8 kHz) ultrasound (specific power, 48-62 W/cm2). The two values were found to depend on USD frequency: Еact was higher in the case of inactivation with low-frequency ultrasound (LF-USD) than high-frequency ultrasound (HF-USD). This fact supports the conclusion that free radicals are involved in the mechanism of G6PDH inactivation in solutions exposed to LF-USD and HF-USD. Isolation and characterization of extracellular glucose oxidase from Penicillium adametzii LF F-2044.1 更多
 lower frequency
 After the modification, the lower frequency limit is 10-3 Hz for the generator, 10-2 for the spectrum analyzer, and zero (dc) for the oscilloscope. CpG, CpA, and TpG sites, which are potential targets for mutagenesis, were found at a much lower frequency in mobile elements than in structural genes. However, considering the concomitant diseases, in the corresponding industrial subgroup a clear trend towards lower frequency of rapid acetylators was demonstrated. This finding was consistent with theR7 allele distribution pattern in the populations of Eurasia, characterized by higher frequency in the West and lower frequency or absence of the allele in the East. The analysis of the frequencies of GSTT1 and GSTM1 polymorphisms among different age groups showed a lower frequency of negative genotypes in the older group, although not statistically confirmed. 更多
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