Based on the understanding that the seismic fault system is a nonlinear complex system,Rundle(1995)introduced the nonlinear threshold system used in meteorology to analyze the ocean-atmosphere interface and the El Ni?...Based on the understanding that the seismic fault system is a nonlinear complex system,Rundle(1995)introduced the nonlinear threshold system used in meteorology to analyze the ocean-atmosphere interface and the El Ni?o Southern Oscillation into the study of seismic activity changes,and then proposed the PI method(Rundle et al.,2000a,b).Wu et al.(2011)modified the Pattern Informatics Method named MPI to extract the ionospheric anomaly by using data from DEMETER satellites which is suitable for 1–3 months short-term prediction.展开更多
人们越来越重视乘车的安全性和舒适性,而乘车舒适性与车辆NVH(Noise Vibration and Harshness,NVH)性能息息相关。车辆的NVH性能正在成为汽车开发过程中的最重要指标,白车身动刚度作为NVH性能关键指标之一,对其进行优化改善是车身开发...人们越来越重视乘车的安全性和舒适性,而乘车舒适性与车辆NVH(Noise Vibration and Harshness,NVH)性能息息相关。车辆的NVH性能正在成为汽车开发过程中的最重要指标,白车身动刚度作为NVH性能关键指标之一,对其进行优化改善是车身开发阶段研究的重要内容,对汽车稳定性、舒适性等具有十分重要的意义。在车身结构设计中,一些关键的安装接附点是向车身传递振动的主要来源。在车身实际开发中,对白车身动刚度的优化往往存在优化方向不明确和优化增重较多的问题,为此,提出基于原点动刚度IPI(Input Point Inertance,IPI)面积灵敏度分析方法。以某SUV车型发动机左悬置接附点Z向动刚度为研究对象,进行有限元仿真分析,并以白车身零件厚度作为变量,建立动刚度灵敏度分析模型,基于IPI面积法,计算出IPI曲线围成面积的零件厚度灵敏度和相对于质量的灵敏度,并根据灵敏度重新设计零件板厚,在车身重量不变的前提下,IPI曲线面积减小,动刚度性能整体提升,计算结果也达到设计的目标值(1/3倍频程),优化效果明显,同时证明了IPI面积灵敏度分析方法是可行有效的。展开更多
This study analyzed and predicted following aspects of isopentenyl py- rophosphate isomerases （IPIs） of five north medicinal plants using bioinformatics methods and tools： physical and chemical properties, hydropho...This study analyzed and predicted following aspects of isopentenyl py- rophosphate isomerases （IPIs） of five north medicinal plants using bioinformatics methods and tools： physical and chemical properties, hydrophobicity/hydrophilicity, trans-membrane domain, secondary structure, subcellular localization and so on. The results showed that： there was no notable difference among the physical and chem- ical properties of IPIs of the five north medicinal plants; the IPIs were mainly hy- drophilic; the IPIs were mainly located in chloroplasts by subcellular localization; serine phosphorylation sites were the most; the secondary structures mainly consist- ed of c^-helixes and random coils; no signal peptide existed, indicating that the pro- tein IPI was non-secreted protein; no trans-membrane domain existed; and one functional domain was shown, Le., Nudix Hydrolase Superfamily. This study is of great significance to research on IPI gene functions, deep research on north medic- inal plants, improvement of efficacy of north medicinal plants and rational develop- ment and utilization of medicinal plant resources.展开更多
基金supported by the Joint Funds of the National Natural Science Foundation of China(Grant No.U2039207)。
文摘Based on the understanding that the seismic fault system is a nonlinear complex system,Rundle(1995)introduced the nonlinear threshold system used in meteorology to analyze the ocean-atmosphere interface and the El Ni?o Southern Oscillation into the study of seismic activity changes,and then proposed the PI method(Rundle et al.,2000a,b).Wu et al.(2011)modified the Pattern Informatics Method named MPI to extract the ionospheric anomaly by using data from DEMETER satellites which is suitable for 1–3 months short-term prediction.
文摘人们越来越重视乘车的安全性和舒适性,而乘车舒适性与车辆NVH(Noise Vibration and Harshness,NVH)性能息息相关。车辆的NVH性能正在成为汽车开发过程中的最重要指标,白车身动刚度作为NVH性能关键指标之一,对其进行优化改善是车身开发阶段研究的重要内容,对汽车稳定性、舒适性等具有十分重要的意义。在车身结构设计中,一些关键的安装接附点是向车身传递振动的主要来源。在车身实际开发中,对白车身动刚度的优化往往存在优化方向不明确和优化增重较多的问题,为此,提出基于原点动刚度IPI(Input Point Inertance,IPI)面积灵敏度分析方法。以某SUV车型发动机左悬置接附点Z向动刚度为研究对象,进行有限元仿真分析,并以白车身零件厚度作为变量,建立动刚度灵敏度分析模型,基于IPI面积法,计算出IPI曲线围成面积的零件厚度灵敏度和相对于质量的灵敏度,并根据灵敏度重新设计零件板厚,在车身重量不变的前提下,IPI曲线面积减小,动刚度性能整体提升,计算结果也达到设计的目标值(1/3倍频程),优化效果明显,同时证明了IPI面积灵敏度分析方法是可行有效的。
基金Supported by Science and Technology Planning Project of Mudanjiang(G2015d1974)Funding Project of Training of Famous Teachers in Mudanjiang Normal University(2014QNGG1805)~~
文摘This study analyzed and predicted following aspects of isopentenyl py- rophosphate isomerases （IPIs） of five north medicinal plants using bioinformatics methods and tools： physical and chemical properties, hydrophobicity/hydrophilicity, trans-membrane domain, secondary structure, subcellular localization and so on. The results showed that： there was no notable difference among the physical and chem- ical properties of IPIs of the five north medicinal plants; the IPIs were mainly hy- drophilic; the IPIs were mainly located in chloroplasts by subcellular localization; serine phosphorylation sites were the most; the secondary structures mainly consist- ed of c^-helixes and random coils; no signal peptide existed, indicating that the pro- tein IPI was non-secreted protein; no trans-membrane domain existed; and one functional domain was shown, Le., Nudix Hydrolase Superfamily. This study is of great significance to research on IPI gene functions, deep research on north medic- inal plants, improvement of efficacy of north medicinal plants and rational develop- ment and utilization of medicinal plant resources.
