浓度

Presents some equations describing tracer gas concentration decay as a base for the experiment, analyses various factors influencing air changes in the room, effectiveness of the technique and its proper implementation, and concludes that the room layout and open-and-shut state of windows and doors in the space measured have a major effect on air changes.

提要 用示踪气体浓度衰减法对某会议室的自然通风作了实测研究，分析了影响换气次数的各种因素、示踪气体浓度衰减法的有效性及其正确应用。揭示出不同的房间布置及不同的门窗开启情况对换气次数有很大影响，而示踪气体浓度衰减法是对此进行实验研究的有效手段。

Considering non-spherical particles, starting from particle size distribution, the concept of the number of equivalent spherical particles was put forward, and the theory formula to calculate mass concentration of non spherical panicles was derived. The validity of the formula for non-spherical particles was verified. On this basis, aerosol mass concen-trations algorithm baaed on the number of equivalent spherical particles was proposed.

考虑非球形颗粒，从颗粒群粒度分布概念出发，提出了统计意义上的等效球形颗粒数概念，给出了非球形颗粒物质量浓度的理论公式，并利用该理论公式阐明了OPC测量非球形颗粒物质量浓度计算公式的合理性，进而给出了基于等效球形颗粒数的悬浮颗粒物的质量浓度算法。

The high viscosity of polymer solution can improve the mobility ratio between oil phase and aqueous phase. Therefore, it can expand sweep efficiency of displacing fluid. In the model of multi-polymer commixing flooding mechanism, each polymer flows in the porous media on its own ability, and the enhanced oil recovery process is resulted from the total concentration of all the polymers.

在多种分子量聚合物溶液混合驱油机理数学模型中，每一种分子量聚合物在油藏中流动满足各自独立的物质传输规律，在驱油机理上表现为多种分子量聚合物溶液浓度之和的总浓度总体驱油过程，驱油机理数学模型中的参数表示为各种分子量聚合物相应参数浓度加权平均的形式。

We observed the correlation between the dynamic change of the serumconcentration of NOS and hemodynamics index,found the serum concentration ofNOS was depressed observably after lung contused and NOS was actived and arrivedpeak at 24h after injected LPS.L-arigin can improve hemodynamics index andthe lung wet/dry index in lung contusion phase; Aminoguanidine can improvehemodyamics index and the lung wet/dry index obviously in ARDSphase.

通过观察ARDS动物模型血清一氧化氮合酶浓度的动态变化以及与血气指标和血液动力学监测指标的关系，发现肺挫伤早期NOS的浓度明显降低，ARDS发生后NOS的浓度明显升高，并在24h达到其峰值，肺挫伤早期给予NOS促进剂、ARDS发生过程中给予NOS阻滞剂可明显改善血气及血液动力学指标、肺湿/干比。

At much higher concentration s, carbon dioxide displaces the oxygen in air below levels necessary to support life.

在更高的浓度下，二氧化碳取代了空气中的氧，氧浓度降到维持生命所必须的浓度以下。

With the increasing of NO3- concentration, the biomass, root absorbability and root absorbing area declined under NaNO3 treatment. The biomass was gradually increased with NO3- concentration increasing under Ca(NO3)2 and KNO3 treatments, while NO3- concentration excessed 98 mmol·L-1, the fresh weight of cucumber seedlings was gradually decreased.

NaNO3处理条件下，随着NO3-浓度增加，黄瓜幼苗生物量降低、根系吸收能力及吸收面积下降；而低浓度Ca(NO3)2及KNO3处理下，黄瓜幼苗生物量随着NO3-浓度增加而增加，当大于98 mmol·L-1时，黄瓜幼苗鲜重逐渐降低。

At the situation of keeping the concentration of inocula constant, comparing the influence of two concentrations, 6% and 7.5%, on COD removal rate, volume gasproduction rate and total gas yield, the results indicate that the concentration of 7.5% is better.

在接种物浓度一定的条件下，通过比较6％、7.5％两种不同发酵液浓度对COD去除率、容积产气率及总产气量的影响，结果表明，从整个反应过程变化趋势来看，发酵液浓度为7.5％的处理产气效果好。

In the medium scale experiment line, the best concentration of coagulation was about72% It was showed that the increasing of the concentration of was good for decreasing surface puckers and made the cross-section shapes tend to circle.

在中试线上，最佳凝固浴浓度为72%左右。对凝固浴浓度与纤维表面形态的研究表明：凝固浴浓度的升高有利于降低纤维表面沟槽，截面更趋于圆形。

In the silk of "yedan 12", iron content increase a little after silking, but the change was gently for the silk of""yedan 19; in the cob, the content of iron decline gradually, and there was a calm trend after silking.

吐丝后掖单12花丝中的铁元素浓度有所增加，而掖单19中的变化较平稳；穗轴中的铁浓度呈现出逐渐下降的趋势，吐丝后的浓度变化较稳定。

The Perennial ryegrass, Tall fescue and Red fescue have the largest seed germination rate under the 8 grades NaCl concentration stress. With the concentration increasing, the seed germination of turfgrass sharply decreased. Most of the turfgrass seeds couldn germinate under the NaC1 stress which concentration was above 0.1%, besides the Zoysia, Alkali grass and Creeping bentgrass got a good germination rate.

利用8个梯度（0％，0.2％，0.4％，0.6％，0.8％，1.0％，1.2％，1.4％）的NaCl胁迫处理试验发现，低盐浓度下（培养液〈=0.2％NaCl）草种发芽率以多年生黑麦草、高羊茅最高；随着盐浓度的增加，各草种发芽率迅速下降，当盐浓度达到1.0％时，大部分草种不能发芽或发芽很少，只有结缕草、碱茅及匍匐翦股颖等草种有较好的发芽表现。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！