穿孔的

Using transfer matrix method to analyze microperforated panel absorber s acoustic characteristic;2. The possibility and the significance of replacing fibred absorption materials by fibreless materials,especially by microperforated panels,are discussed.

简要地介绍了吸声材料的基本特点，阐述了无纤维性吸声材料（特别是微穿孔板吸声结构）取代传统的纤维性吸声材料的可能性及其重要意义，较详细地介绍了近年来德国以及我国科研人员在无纤维吸声材料研究上所取得的进展。

To study the expression, purification and bioactivity of human augmenter of liver regeneration in Pichia Pastoris, the expression plasmid pPICZαA- ALR was constructed and transformed into P. Pastoris by the method of electroporation transformation. Induced with 0.5% methanol, the 30 kD protein in the culture supernatant of recombinant P. Pastoris was confirmed to be rhALR by SDS-PAGE and Western blot. Quantitative analysis showed that the target protein was in a level of 66% of the total protein of the culture supernatant, with a yield of 40mg/L.we had performed DEAE anion exchange chromatography two times with excessive and regular adsorption quantity consecutively, and then the rhALR above 95% purity and 52% protein recovery could be obtained by G75 molecular sieve chromatography at last step. The bioactivity assay of the purified product showed that rhALR could stimulate the proliferation of HepG2, SMMC-7721 and NIH-3T3 in vitro.

为在毕赤酵母中分泌表达人肝再生增强因子，以色谱法分离纯化后进行体外活性研究，构建表达载体pPICZαA- ALR，经电穿孔转入毕赤酵母中，用0.5％甲醇诱导表达；重组酵母培养上清经SDS-PAGE电泳和western blot鉴定后表明， rhALR以分子量为30kD的二聚体为主；定量分析结果表明，重组酵母培养上清中rhALR约占总蛋白的66％，表达量约为40mg/L；经DEAE柱和G75柱纯化后，获得的rhALR纯度大于95％，得率为52％；体外生物学活性实验表明，rhALR能明显促进HepG2、SMMC-7721和NIH-3T3细胞的增殖。

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。

Hwoever,on third and fifth induced day,mIL-2+B16 PELs and 22.8% and 23.1%cytotoxicity,distinct expression of perforin and granzymeA genes,many granules in cytoplasm.

在这一天〓细胞诱导的PEL与上述结果相同。2.mIL-2〓细胞诱导三天时，取得的PEL则有明显的粒酶A和穿孔素基因表达，其细胞毒活性也达22.8%，电镜下的PEL胞浆中可观察到杀伤颗粒。

In three of the patients with partial GSV occlusion, the source of reflux was a large incompetent perforator leading into the patent portion of the GSV.

在三个部份GSV 封锁的患者中，逆流的来源是一个大的穿孔，导致GSV的开放性部份。

It is found that the stiffness of the beam is inadequate, which result in two gaps between the central beams of the moving beam; there are two weak strength sections where existing in the tie rod cylindrical hole and chamfering nearby the perforation cylinder.

通过分析发现横梁的刚度不足，致使中梁之间有两处开缝；强度较薄弱存在两处，分布在拉杆的圆柱孔边和穿孔缸附近的倒角处。

RESULTS: Of 1271 patients with perforated peptic ulcers included in the study, 2.4% used tramadol only, 38.9% used NSAIDs and 7.9% used both. Thirty-day mortality was 28.7% overall and 48.4% among users of tramadol alone.

结果：本研究中的1271位穿孔性消化性溃疡患者，2.4%仅使有曲马多，38.9%仅服用了NSAIDs ，7.9％使用了上述两种药物。1271位患者30天的总死亡率是28.7%，单独使用曲马多的为48.4%。

The pneumatic percussive steerable mole adopts the percussion part of the underground mole, which has a bi-stable steering head updated from the old symmetrical stepped head. So it can construct along a curve path and implement deviation correction.

其中，气动冲击式轨迹可控穿孔机采用了地下穿孔机的冲击部分，并将其原来的对称式阶梯形冲击头改进为具有导向功能的双稳式导向穿孔头，从而使穿孔机可以进行曲线轨迹施工以及当发生偏离时可以进行纠偏。

Piano that uses a roll of perforated paper to activate the keys.

用滚动的穿孔纸激活键盘的自动演奏的钢琴。

OMG I loved that movie but I want to know y king xerxes has so many piercings I've tried to look it up all over history and the internet and it doesn't say anything about it can you tell me why he does and for what purpose?

OMG我喜欢这部电影，但我想知道的辎国王薛西斯有这麼多穿孔我试图寻找它的历史和各地的互联网，并没有说是怎麼回事，你能告诉我，为什麼他不为了什麼目的是什麼？

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。