多孔和铸装高能推进剂的燃烧转爆轰

为研究多孔和铸装高能推进剂的危险性能，设计加工了燃烧转爆轰的实验装置，并建立了以光电管为主的测试系统。经实验发现，多孔装药在燃烧向爆轰的转变过程中有冲击波／爆轰波的回传现象，而铸装药则没有

Optimization Electrode of GaN-Based Light-Emitting Diode

针对以蓝宝石为衬底的GaN基发光二极管出现的电流扩展不均的问题,采用有限元方法建立了GaN基发光二极管的三维网络模型,并对四种常见结构的器件进行数值模拟,发现影响二极管电流的因素不仅与发光二极管电极的位置有关,而且依赖于器件的结构参数。以电流扩展不均为指标确定出这四种器件中最佳的电极位置分布,同时对最佳电极位置分布的器件进行了结构参数优化,结果表明当p型金属层方块电阻与n型GaN的方块电阻接近时,电流扩展均匀性最好,且p-GaN的接触电阻和厚度越小,电流扩展越不均匀。A 3D networks model of GaN-based LED on sapphire substrate was built by finite element analysis to simulate the non-uniformity current spreading.Analog modeling was done on the four normal device structures,it was found that the factors effected the current of LED were the position of electrode and the parameters of device structure.Considering the practical structures of GaN-based LED,four LED designs were modeled and the optimal electrode distribution was obtained,meanwhile the structure parameters were optimized.It reveals that the smaller contact resistances and the thickness of p-GaN are,the more non-uniformity of current distribution is.国家自然科学基金(60276029);; 国家863计划(2004AA311020和2006AA032409);; 福建省科技项目和基金(2006H0092,A0210006,2005HZ1018

Analysis of genetic effects for grain quality characters in late indica hybrid rice

以6个籼型野败三系不育系为母本,5个晚籼恢复系为父本,进行不完全双列杂交设计,对籼型杂交晚稻稻米品质性状的遗传效应进行分析.结果表明:糙米率、精米率、垩白粒率、碱消值和胶稠度等5个性状同时受到种子遗传效应和细胞质遗传效应的控制,但细胞质遗传效应都大于种子遗传效应.整精米率、垩白度和透明度等3个性状只受到种子遗传效应的控制,并且都以种子显性遗传效应为主.直链淀粉含量同时受到种子遗传效应和母体植株遗传效应的控制,但以种子显性遗传效应为主.粒长和长宽比同时受到母体植株加性遗传效应和母体植株显性遗传效应的控制.不育系451A、全丰A、长丰A及恢复系蜀恢527、科恢752、岳恢94是配制优质杂交晚稻组合的优异亲本.Six CMS(Fuyi A etc.) and 5 late-restorers(Minghui 63 etc.) were used in partial diallel crosses to analyse the genetic effects of grain quality characters in late indica hybrid rice,using seed quantitative traits genetic models and analysis methods developed by Zhu Jun in cereal crops.The results showed that the 5 characters were simultaneously controlled by seed genetic effects and cytoplasmic genetic effects in percentage of brown rice,percentage of milled rice,percentage of chalky grain,gelatinization temperature and gel consistency,but the cytoplasmic genetic effects were all higher than the seed genetic effects.The 3 traits were only controlled by seed genetic effects in percentage of head rice,chalkiness and translucency,and the effects were all mainly come from seed dominance genetic effects.Amylose content was controlled by seed genetic effects and maternal genetic effects,but was mainly controlled by seed dominance genetic effects.The 2 traits were simultaneously controlled by maternal additive genetic effects and maternal dominance genetic effects in kernel length and length/breadth ratio.The 6 materials were available parents for breeding late indica hybrid rice combinations with good quality,which included the CMS of 451 A,Quanfeng A and Changfeng A,the restorers of Shuhui 527,Kehui 752 and Yuehui 94.福建省自然科学基金资助项目(B0310020

Approaches to remove size effect due to indenter roundness in nano-indentation

The results of indentation are hard to interpret because the effects of indenter roundness and material's intrinsic properties coexist, especially when the indentation depth is within one hundred nanometers.The effect of indenter roundness is inevitable and un

推进剂的撞击损伤状态对其燃烧转爆轰的影响

设计加工了燃烧转爆轰的实验装置，并建立了相应的测试系统，旨在研究NEPE推进剂颗粒装药的燃烧转爆轰形成机理。并以大型落锤为加载手段，撞击NEPE推进剂试样，经实验发现，损伤明显地促进了颗粒装药燃烧向爆轰的转变，增加了该推进剂使用的危险性

Measurement of mechanical properties of MEMS materials

微电子机械系统（MEMS）技术的迅速崛起，推动了所用材料微尺度力学性能测试技术的发展，首先按作用方式将实验分成压痕／划痕、弯曲、拉伸、扭转四大类，系统介绍检测MEMS材料微尺度力学性能的微型试样、测试方法及其实验结果。测试材料主要有硅、氧化硅、氮化硅和一些金属。实验结果主要包括基本的力学性能参数如弹性模量、残余应力、屈服强度、断裂强度和疲劳强度等。最后，简要分析了未来的发展需求

NLRP3炎性反应小体在缺血再灌注急性肾损伤大鼠肾组织中的表达研究

目的:研究NLRP3炎性反应小体在缺血再灌注急性肾损伤大鼠肾组织中的表达。方法:选取SD雄性大鼠14只,平均分为缺血再灌注组(A组)和假手术组(B组),对比两组之间血肌酐、尿素氮变化及NLRP3表达的差异情况。结果:A组大鼠血肌酐、尿素氮水平明显高于B组大鼠,差异有统计学意义(P<0.05);免疫组化显示缺血再灌注急性肾损伤组大鼠肾小管上皮细胞NLRP3的表达显著增强;病理学检查显示缺血再灌注组大鼠肾小管间质损伤较严重。结论:缺血再灌注急性肾损伤会伴随血肌酐水平升高以及肾组织NLRP3表达增强。厦门市科技局2016科技惠民项目[项目编号:3502Z20164060

百纳米以下压入硬度规律的科学意义和挑战

仪器化压入是广泛应用的微/纳米力学测试方法,可靠的百纳米以下压入硬度尺寸效应的规律及其机理是其中尚未完全认识清楚的问题.本文总结了课题组近期在百纳米以下压入硬度的实验和模拟方面的进展:通过精确控制试样晶向状态和表面粗糙度,表征压头尖端曲率,在大规模分子模拟中引入压头曲率参数,实现了实验和模拟的衔接和相互校核,获得了可靠的百纳米以下的压入硬度规律,并揭示了两种相反的尺寸效应的机理,即常规的随压入深度减小而增大的硬度尺寸效应来源于压头下方材料中位错的形核和传播,而与压入初始阶段的相反尺寸效应来源于压头尖端曲率和材料弹性行为之间的耦合效应;针对压入过程中的位错演化,系统对比了分子动力学和分子静力学的结果可靠性和计算效率与弛豫时间和能量收敛精度参数的关系,提出了选取模拟方法和模拟参数的依据