material physics and chemistry meaning in English
材料物理与化学
Examples
- Materials physics and chemistry
材料物理与化学 - Zhang liji ( material physics and chemistry ) directed by professor xie xiaoming this paper is intended to solve problems for those who are designing , using pbgas . failure mechanism , as well as cycles to failure of two groups of pbga samples ( with / without underfill ) for thermal cycling conditions in the range of - 40 ~ 125 , were presented . the experiment shows that solder ball in the samples without underfill cracked after 500 times cycle , no crack was found in the underfilled samples even after 2700 cycles
通过一系列的实验，得到以下实验结果： ?在本论文设定的温度循环条件下，未充胶pbga样品的热疲劳品寿命在500周左右，充胶样品的焊点寿命高于2700周； ?对于未充胶器件，中心距( dnp )是决定焊点应力、应变大小的最主要因素，裂纹总是从中心距较大处萌生并向中心处扩展； ?温度循环的过程中焊盘附近焊料组织明显粗化。 - Jiulin wang ( materials physics and chemistry ) directed by naixin xu , jun yang and jingying xie due to its abundant resources , low toxicity and the highest charge capacity in all known cathode materials , elemental sulfur is a promising cathode material for the next generation of high - performance lithium batteries
单质硫因具有很高的理论能量密度、丰富的自然资源和无毒性等多种优势，成为下一代锂电池中替代licoo _ 2的首选正极材料之一。可是目前报道的li / s电池面临着一系列严重的问题，包括活性物质利用率低，循环性能差等。