查询词典 threshold frequency

The divide of the degree of auditory injury is basis on the dB decrease of equal number about pure tone of speaking frequency - testing threshold of audibility through air.

近年来，由于听觉脑干诱发电位不受被检者主观意识、睡眠、药物的影响，因此作为客观听力检测方法在法医学鉴定中已广泛应用。

Methods Pure-tone audiometry and statistical analysis of the hearing threshold of the speech frequency and high frequency were performed in 60～70 years old elders.

方法对 6 0～ 70岁有军事噪声暴露史的老年人 79例(15 8耳)及无军事噪声暴露史的老年人 36 4例(72 8耳)进行纯音测听，将言语听阈和高频听阈进行统计分析。

Phenological observation data of plant communities from 1982 to 1996 at 5 sites and a method for phenological cumulative frequency modeling were used to determine the beginning dates of local phenological seasons and their corresponding threshold values of normalized difference vegetation index in each year.

利用1982～1996年5个站点的植物群落物候观测数据和物候累积频率拟合法，划分各站逐年的植被物候季节，并确定各季节初日对应的当地归一化差值植被指数阈值。

Answer: Shoots the frequency wave is the wave band is the 40.67MHZ electromagnetic wave, causes through the different technique to shoot the frequency wave penetration surface layer base first floor the melanophore, depth of penetration 2mm-20mm, resonates the principle through a minute small water-kettle to cause the organization to heat up to the threshold value temperature 65 ℃-75 ℃, both affects to the collagen organization, and may affect to the fat, achieved dispels wrinkles the skin, dissolves the effect which the fat loses weight, does not have any damage to the epidermis.

答：射频波是波段为40.67MHZ的电磁波，通过不同的手法使射频波穿透表层基底层的黑色素细胞，穿透深度2mm-20mm，通过分水子共振原理使组织加热至阈值温度65℃-75℃，既作用于真皮层胶原组织，又可作用于脂肪，达到祛皱紧肤、溶脂减肥的功效，对表皮无任何损伤。

In the 65 recorded neurons, the results showed: Characteristic frequency , minimum threshold and response latency was between 18.9 and 76.7 kHz (42.94 ± 11.29), 29 and 80dB SPL (58.65 ± 12.62), 3.1 and 13.4 ms (6.10 ± 1.47), respectively; CFs increased with the recording depth, but CF and MT were not correlated; There were three different types of discharge patterns in the IC, including phasic pattern (73.9%), chopper (15.4%) and tonic (10.7%); The types of frequency tuning curves were all V-shaped, most of which were wide type and few were narrow type.

结果发现，在所得的65个下丘神经元中：特征频率在18.9～76.7kHz(42.94±11.29)之间，最小阈值在29～80dB SPL(58.65±12.62)之间，潜伏期在3.1～10.4ms(6.10±1.47)之间；特征频率随记录深度的增加而增大，与最小阈值之间没有显著相关性；发放类型包括相位型(73.9%)、梳齿型(15.4%)和紧张型(10.7%)3种基本类型；频率调谐曲线均为开峰型，多数神经元(72.3%)调谐曲线较宽阔，少数(27.7%)较狭窄，并且多数神经元的频率调谐曲线高频边比低频边陡。

Objective To probe into the effects of military noise on the hearing threshold of the speech frequency and high frequency in the elders.

目的 探讨军事噪声对老年人言语频率及高频听力的影响。

Feature evaluating function based document frequency with minimum term frequency threshold is present in the paper.

2针对文本关联分析中难以确定最小支持度阈值的问题，提出N个最频繁项集挖掘算法。

In noise-exposed ears, the occurrence of threshold changes in the high frequency range (10 to 20 kHz) is earlier than that in the low frequency range (0.5 to 6 kHz).

接触噪声的各年龄组10～18 kHz阈值随年龄的增长而升高；不同工龄组比较，6～10年工龄组的10～18 kHz阈值明显升高；不同噪声强度组的10～20 kHz阈值比较差异无显著性（P＞0.05）。

Then do wavelet transform using fast wavelet transform algorithm, and then facial feature is enhanced by three high frequency parts using different threshold to enhance high frequency.

然后用小波快速算法mallat算法对图像进行小波变换，并且针对小波变换之后的三个高频部分分别设定阈值进行增强。

Combined with the decorrelation technique by pulse-to-pulse carrier frequency hopping, the proposed algorithm is used for preprocessing and can greatly lower the SNR threshold of superresolution implemented in frequency domain.

在该算法的基础上，结合脉间跳频回波去相关的设计，我们提出了在频域实现超分辨处理的有效方法，从而大大降低了超分辨处理的SNR门限。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷