最低的频率

The influence on absorption coefficient brought from shape choice with cylindrical or cone-shaped cavity, square or hexagonal profile, from different closure as air or water, from different material properties and structure sizes, are analyzed based on the numerical calculations. Some general characteristics are summarized. It shows that lowest resonance frequency of sound absorbent coefficient is inversely proportional to volume of cavity and sound absorbent coefficient is proportional to perforated percentage.

2通过数值方法研究了吸声结构内腔为圆柱腔和圆锥腔、基材的剖面形状为正四边形和正六边形、不同背衬、基材材料特性、尺寸大小对整体吸声效果的影响，总结了这些情况下非旋转对称吸声结构的声学特性变化规律，得出腔体体积越大，吸声系数最低共振频率越低；穿孔率越大，吸声系数越大的结论。

Use of Chinese young learners is in the medium range;(2) among the six strategy categories metacognitive strategies are the most frequently used whereas compensation strategies are theleast frequently used;(3) there exists statistically significant difference between female and male young learners in language learning strategy use; and (4) there is a positive correlation between young learners' language learning strategy use and their language proficiency.

其中，元认知策略的使用频率最高，补偿策略的使用频率最低；(2)男、女生在学习策略的使用上存在显著差异，无论是在总体上还是六种策略的使用上，女生都比男生的使用频率高；(3)成功的英语学习者学习策略的使用频率最高，其次是水平一般的学习者，不成功的学习者学习策略的使用频率最低。

The minimum coefficient of nonlinear and intermodulation distortion, precision, stability and range of frequency are limited only by quality of the used sound card.

最低系数的非线性和互调失真，精确，稳定和一系列的频率是有限的，只有高质量的用於声卡。

In this study,two SNPs of chicken FASN gene were chosen to analyze genetic diversity and their associations with chicken growth and carcass traits by using a F_2 designed resource population.Results showed that:(1) In the PCR-RFLP site of HaeⅢ,allelic frequencies differed much among different chicken breeds,as B frequencies are the highest in Red Jungle Fowl(0.85),and the lowest in Taihe and Yugan Black(both 0.21).In the PCR-RFLP site of PstⅠ,A frequencies are the highest in Chongren Partridge(0.5),and the lowest in Naked Neck chicken(0.19),and the difference of gene frequencies was small among chicken breeds.

研究了脂肪酸合成酶(Fatty acid synthase， FASN )基因最后1个内含子2个突变的多样性，并运用资源参考家系研究了这2个突变对鸡体重、脂肪沉积性状的影响，结果表明：(1)红色原鸡Hae Ⅲ-PCR-RFLP位点B基因频率为最高(0.85)，泰和鸡及余干乌黑鸡为最低(0.21)，品种间差异较大，但未发现肉用与蛋用鸡种间的差异；在Pst I-PCR-RFLP位点上， A基因频率在崇仁麻鸡中表现为最高(0.5)，在裸颈鸡为最低(0.19)，品种间差异较小。

Intravoneous injection of 0.5mg/kgBW jingsongling cause the 60 minutesrelaxation of goat gastric motor.The effects of jingsongling on the gastric motor ofgoat is major of effects of α2 -adrenoceptor agonist,as well as that of α1 -adrenoceptor agonist,the effects of α1 -adrenoceptor agonist concentrate at thecardic and pylorus;the function of α2 -adrenoceptor exit widely at cardic,pylorus,rumen,reticulum,omasum and abomasum,the function at different part is not the same.The lowestdose of jingsonglinginhibiting the amplitude and frequency of the gastricmyoelectric is 0.01mg/kgBW;the influence of jingsonglingto the gastricmotility of goat is dose-dependent,and the amplitude regain after the frequency ofgastric myoelectriv wave.When the goat revived,the gastric motor function is notreach the level of the normal;the major reason ofjingsongling cause the goat gastricrelaxation is the amplitude renew slowly.The intravoneous injection ofjingsonglingfirst,after 5 minutes,intravoneous injection the antagonist,the effect of prazosin and idazoxan mixed is best,which can fast reversal of theinhibition of jingsongling on the gastric motor of goat,the effects of idazoxan isgood,and the prazosin block the effection of jingsongling is better than that ofxylazine,especially at cardia and pylorus.When intravoneous injection of0.5mg/kgBW idazoxan and/or prazosin only,the amplitude of gastric myoelectric ingoat increases at a certain degree,but the frequency is not changed.

静脉注射0.5mk/kgBW的静松灵引起山羊胃蠕动弛缓长达60分钟；静脉注射0.5mg/kgBW的静松灵对山羊胃蠕动机能的影响是以α2肾上腺素受体作用为主的，兼有α1肾上腺素受体的作用，而且静松灵的α1肾上腺素受体的作用主要集中在幽门和贲门；α2肾上腺素受体的作用广泛存在于贲门、瘤胃、网胃、瓣胃、皱胃和幽门中，不同部位间有功能上的差异；静注0.01mg/kgBW的静松灵是对山羊的贲门、瘤胃、网胃、瓣胃、皱胃和幽门的肌电波频率和振幅均产生影响的最低剂量；静注一定剂量的静松灵对山羊胃蠕动的抑制作用与剂量呈相关性；而且山羊胃肌电波振幅的恢复比肌电波频率的恢复慢；苏醒时山羊的胃蠕动机能尚未恢复到正常状态；静松灵引起山羊胃弛缓的主要原因是由于胃肌电波的振幅恢复慢；静注0.5mg/kgBW的静松灵，5分钟后静注0.5mg/kgBW的拮抗剂时，咪唑克生+哌唑嗪的作用最好，能迅速地逆转静松灵对山羊胃蠕动的抑制作用，咪唑克生也有很强的拮抗作用，而哌唑嗪对静松灵的拮抗效果好于对隆朋的拮抗；单独静注0.5mg/kgBW的咪唑克生和/或哌唑嗪时，山羊的瘤胃、网胃、瓣胃、皱胃、贲门和幽门的肌电波振幅有一定程度的增强，而肌电波频率未见变化。

The minimum fluidization velocity has a minimum value when the frequency of sound waves is 120Hz and it will decrease as the sound pressure level increases. The degree of sound attenuation will increase while bed material is higher and the fluidization quality of fine particles will become poor and the minimum fluidization velocity will increase. Compared with TiO2, the SiO2 fine particles have a better quality of fluidization at the same fluidized conditions.The cluster/subcluster model and oscillators model are used to describe the fluidization characteristics of fine particles in a sound-assisted fluidized bed. The theoretical calculations show that the minimum fluidization velocity umf is decreased with the SPL increased at the same frequency of sound and the quality of fluidization is better.

论文还系统的考察了声压和频率对纳米SiO2和TiO2颗粒流化特性的影响，结果表明：在频率一定的情况下，声压越高，流化床中形成的聚团尺寸越小，最小流化速度越低，流化质量越好；当声压低于120dB时，声场对超细颗粒流化特性的影响减小，当声压大于130dB时，则能显著改善流化效果，使流化床内的颗粒聚团明显减小，最小流化速度明显降低，粉体带出减小；声压一定，频率为120Hz左右时，最小流化速度最低，此时流化床中形成的聚团尺寸最小，流化效果最好；超细颗粒达到较好的流化状态存在一个最佳频率范围，随着声压增高，这个频率范围将增大。

Lowest fixed frequency 2.0Hz,endwise and crosswise rate of damp respectively are 0.1~0.15,applying to passive vibration of precise apparatus and motor、compressor etc. With high vibration requirement and high resonance requirement in crosswise to do the active vibration.

型：最低固有频率2.0Hz，竖向和水平向阻尼比均为0.1~0.15，适用于精密仪器设备的被动隔振和发动机、压缩机等隔振要求较高、且对水平向抑制通过共振要求较严的设备作主动隔振

The December issue reports that stage 3 to 5 CKD is found in 4% to 5% of the adult population in the United Kingdom, most often in elderly individuals who have comorbidities for which they are prescribed several drugs. The authors remind practitioners that patients with impaired renal function have decreased drug clearance by the kidney and may be more susceptible to certain nephrotoxic drugs. They advise:"Whenever possible, should take steps to minimize these risks, by avoiding the drugs, using reduced doses or administrative frequency, or increasing the monitoring of renal function" by measuring estimated glomerular filtration rate.

12月号的报导刊载了英国人口中，有4%至5%是CKD第3至5级，大部分是老年人，且这些病患经常使用多种药物；作者提醒执业医疗人员，肾脏功能不全病患其肾脏排除药物的清除率下降，而且更可能受到某些具有肾毒性药物的伤害；他们建议，当情况允许时，执业人员应该将这些风险降到最低，透过避免使用部分药物，或是降低剂量、或频次，或是增加监测肾丝球廓清率的频率来评估肾脏功能。

Here the brainwaves are of the greatest amplitude and slowest frequency .

它是振幅最大、频率最低的一种脑电波。

For the FA, the results indicated that the VPD calculation using mean of 24 hourly temperature values as saturation vapor pressure, and wet-bulb depression as actual vapor pressure yielded the lowest error, the least range, and the most frequency with the highest WI. These outcomes were as well as the SIA with the lowest EMSE, R^2 higher than 0.99 and the highest CE.

分析结果显示，以频率分析法而言，各地农业气候分区均呈现，VPD计算式以24个时温度日平均为饱和蒸汽压力，与湿球下陷量为实际蒸汽压力，具误差最少、全距最小、出现频率最多及最高权重指数，性能表现最佳，这样的结果，对照统计指标法之检测评估，同样具最低RMSE、R^2值0.99以上及最大CE，性能表现优於其他所有VPD计算式，两者，结果一致。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。