| 1. | The critical concentration and critical particle surface area in constant rate section is studied . the floc density pa and the floc equivalent diameter da are calculated on the basis of experimental data and theoretic analysis
研究了等速段的临界浓度、临界颗粒表面积；分析计算了絮团密度_ 、泥沙絮团当量直径d _ 。 |
| 2. | 5 . the injury degree of so2 on plant is a funition of the exposure time and so2 concentration . the injury critical concentration depends on the exposure time , and the time length is closely relevant to so2 concentration
植物受so _ 2的伤害程度是暴露时间和so _ 2浓度的函数，其中伤害的临界浓度取决于暴露时间，而其时间的长短与so _ 2浓度密切相关。 |
| 3. | Under different al concentrations , there are same change curves of sce rates hi cv . 2000 - 2 and cv . humai 16 , but their critical concentrations , which can induce the highest sce rates , were significantly different from each other
经不同铝浓度处理，这两个品种的sce率具有相类似的变化曲线，但两者的临界浓度(诱导sce率最高的浓度)显著不同(分别为10和320 mol l ) 。 |
| 4. | In this paper , it was mainly studied that the penetration capacity and critical content of chloride ions in concrete with different water / binder ratio , fly ash and slag under immersion and cycle of dry and wet conditions
本文着重研究了全浸泡条件下和干湿循环条件下，氯离子在不同水胶比和不同掺量的粉煤灰、矿渣粉混凝土中的渗透性能，以及混凝土内钢筋腐蚀的氯离子临界浓度。 |
| 5. | The presence of calcium is beneficial to obtain higher tryptophanase activity . the activity of tryptophanse expressed by addition of appropriate concerntration of iptg is 91 - fold higher than that of no induction . the highest specific activity was
0 . 2mmiptg对菌体的生长有抑制作用，在细胞对数生长期前期诱导抑制最强烈， 0 . 1mmiptg基本不抑制生长；临界浓度0 . 15mm的iptg和37ac是比较好的组合。 |
| 6. | The critical concentration of mannitol stress is 0 . 8 - 0 . 9mol - l - 1 . the maximal level of aba accumulation is attached after 5 hours " treat with 0 . 9mol - l - 1 mannitol solution . cell wall plays important roles in tobacco cells perception to osmotic stress
渗透胁迫诱导aba积累的水平与胁迫处理的浓度和时间相关，胁迫处理的有临界浓度为0 . 8 ? 0 . 9mol ? l ~ ( - 1 ) ， aba积累水平在胁迫处理5小时后达到最大。 |
| 7. | Test results show chloride ions critical content in immersion conditions is always larger than that in cycle of dry and wet for the same concrete , that is , test conditions affects chloride ions critical content value . in the same conditions , water / binder ratio obviously affects chloride ions critical content , but the influence of fly ash or slag on chloride ions critical content is not obvious . it is obtained the equation that chloride ions critical content change with water / binder ratio through linear fitting experiment data
结果表明，同技术条件的混凝土试件，在全浸泡条件下的氯离子临界浓度均要大于干湿循环条件下的，即临界浓度大小受到试验条件的影响；相同的试验条件下，水胶比对氯离子临界浓度大小有显著地影响，而掺入适量的粉煤灰或矿渣粉对氯离子临界浓度无明显地影响。 |
| 8. | Abstract : methanesulfonic acid method was used to prepare five acylated chitins . except heptanoyl chitin , four of them , i . e . acetyl chitin , propionyl chitin , butyryl chitin and hexanoyl chitin , had high degree of substitution ( from 1 . 5 to 2 . 0 ) and exhibited lyotropic liquid crystalline behavior and cholesteric phase . as the length of the side chain increased the critical concentration ( w / w ) somewhat increased from 0 . 21 to 0 . 26 because the chain rigidity dropped . the critical concentration values of all the four derivatives were much higher than that of chitin ( 0 . 12 ) due to the decrease of intramolecular hydrogen bonds . the four acylated chitin can form typical banded texture after being sheared . there minimum concentrations to form banded texture of them were evidently different , varied from 0 . 25 ( for acetyl chitin ) to 0 . 37 ( for hexanoyl chitin ) . these results further indicated that liquid crystallinity decreased while the length of flexible side substituents increased
文摘:四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相.临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释.四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少 |
| 9. | In this paper , rebar corrosion state was judged with three electrochemical nondestructive measuring technologies , i . e . half - cell potential , a . c . impedance and time potential . when the rebar was transformed from passivation to depassivation , it can obtain the chloride ions corrosion critical content through taking and analyzing chloride ions content around the rebar
本文利用半电池电位法、交流阻抗法和时间电位法三种电化学无损检测技术判断评估试件在试验过程中钢筋腐蚀状况，当钢筋由钝化状态转为活化状态时，取样分析钢筋周围氯离子含量，得到了不同技术条件混凝土的氯离子临界浓度。 |
| 10. | Some cubic perovskites are good cases in point such as srtio3 and ktao3 . experimental results show that when ba2 + and li + are doped into the above materials respectively and at the same time the impurity content is higher than their critical concentration , the impurity induced ferroe lectric phase transition occurs
Srtio _ 3和ktao _ 3是典型的量子顺电体，实验表明当两者分别掺杂ba ~ ( 2 + )和li ~ +且杂质浓度超过各自的临界浓度时，顺电相不再稳定，出现由杂质导致的铁电相变。 |
