be critical of 爱挑毛病的,批评的; 对----表示谴责,对-----感到不满; 对......持批评态度; 对...爱挑剔的; 对……批评; 批评的
critical adj. 1.批判的,批评的;(在某方面)有鉴定力的 (in)。 2.吹毛求疵的;爱挑剔别人的 (of, about)。 3.危机的,危急的;决定性的,重大的;急需的(物资等);【医学】危象的;极期的。 4.【数,物】临界的;中肯的;足够发生连锁反应的。 I am nothing, if not critical. 只有这张刻薄的嘴,是我的长处。 be critical about 爱挑剔。 adv. -ly
critical of 对...感到不满,对...表示谴责; 对…持批评态度的;对…苛求的; 对…挑剔; 与…相反
volume n. 1.卷,册;书籍;【历史】书卷,卷轴。 2.〔常 pl. 〕大块,大量,许多。 3.体积;容积;分量,额;【物、乐】音量;强度,响度。 a novel in three volumes 一部总共有三卷的小说。 volumes of vapour 大量的水蒸气,蒸汽弥漫。 atomic volume 原子体积。 the volume of retail sales 商品零售额。 express volumes 说得意义很充实[很有内容]。 gather volume (程度)增大 ( Her anger was gathering volume. 她越来越生气了)。 pour out volumes of abuse 破口大骂。 speak volumes = express volumes. speak volumes for 足够证明,有力地说明。 tell volumes = express volumes.
The resistivity - temperature curve can be predicted by using this mathematical model , which was in good agreement with the experimental data when the cb volume fraction is close to the critical volume fraction 利用这个数学模型,还对两种ptc材料的阻温曲线进行了预测,与实测结果比较发现,当炭黑含量在渗流阈值附近时,预测值与实测数据吻合很好。
It shows there was a critical volume fraction . only when the initial pore volume fraction of the perform equal to the critical volume fraction , the free si was fully replaced with the mosi2 particles . otherwise . there would be free c and free si in the infiltrated materials 结果表明,坯体的初始空隙率存有一个临界值。只有当坯体的初始空隙率等于此值时,材料中的游离硅才可能被mosi _ 2完全取代。
Through the research of crosslinking of matrix resin , heating treatment of composite and mixing of different polymer , we draw some conclusions : 1 、 percolation theory can explain the phenomenon of the jump of resistance when the content of cb reach a critical volume ; 2 、 based on ohm conduct theory , abounded to the percolation the wbibull statistical theory and other theory , an adapted theory was obtained to explain the jump of resistance and the other phenomenon ; 3 、 the ntc phenomenon was eliminated by crosslinking the matrix of conductive composite , at the same time the stability of composite was improved 通过对基体树脂的交联、复合材料的热处理、聚合物共混物的研究得出了如下的结论: 1 、渗滤理论能够很好的解释导电粒子含量达到某一值时电导率剧增的问题; 2 、在欧姆导电模型的基础上,综合应用了weibull统计理论模型,结合原来的体积膨胀等理论,成功的解释了ptc复合材料在基体材料熔点附近的跳变问题、 ntc现象以及热循环稳定性等问题; 3 、有机ptc导电复合材料经硅烷交联以后能够消除ntc现象,改善了导电复合材料的稳定性能。
By using this model , the contribution of the thermal volume expansion of the matrix to the ptc transition of the composite is quantitatively estimated . the theory and experiment revealed that the conductive mechanism of abrupt resistivity increase at ptc transition region was equivalent as abrupt resistivity increase at the percolation curve close the critical volume fraction 可以利用这个模型,对基体体积膨胀对ptc转变的贡献进行了定量分析,表明ptc转变区的电阻突变与渗流曲线在临界体积分数附近的电阻率突变在导电机制上是相同的。