高原农作物豌豆抗氧化和脂质过氧化研究

1材料与方法 1．1材料供试豌豆产于西宁互助,海拔3600m;供试小鼠体重18-22g,雌雄对半,由青海动物养殖场提供。     

基于实时性优化的内燃机燃烧分析系统研究

采用缸压传感器、数据采集卡、光电编码器和Lab VIEW软件,搭建在线缸压采集和实时燃烧分析系统平台,研究HCCI和RCCI燃烧模式的循环波动特性。针对单循环缸压测量过程中的通道效应干扰,基于频谱分析,采用FFT、线性插值法和IFFT等方法相结合的滤波方式,实现共振峰的在线自适应识别与实时滤波,较好地减少了单循环缸压的干扰误差,使单循环的实时燃烧分析成为可能。随后,基于实时滤波后的缸压曲线,计算得到内燃机的最大压力升高率、燃烧放热率、爆发压力等重要燃烧参数。利用程序算法中同步性良好的生产者/消费者运算模式提高数据的共享能力,实现了数据实时运算与数据快速储存的并行处理,提高了燃烧计算的实时性;针对发动机不同工作阶段采用了不同精度层次的计算方法,减少了进排气、压缩和膨胀阶段的计算耗时,在计算量较大的燃烧放热率计算部分,通过适当简化计算公式和公式节点运算模块来提高燃烧系统的实时性。最后,分析了燃烧分析系统的实时性,并进行了燃烧分析系统的实验验证。     

基于VLF/LF三维闪电探测系统的贵州省全闪分布特征分析

为进一步加强云闪分布特征分析,增强对雷暴云内物理过程的认识,利用2015—2017 年VLF/LF三维闪电探测系统的数据资料对贵州省闪电特征进行空间和时间分布特征分析。结果表明：无论云闪还是地闪,均以负闪为主;闪电发生主要集中在夏季,冬季闪电最少,闪电月际分布主要为单峰型,仅冬季Z比率大于1;闪电主要发生时段为16 时至次日凌晨2 时,Z比率与全闪频数随时间的变化呈正相关,相关系数0.618;全省闪电密度整体呈西高东低趋势,年均闪电密度为5.07 次/(a ·km2);云闪主要发生在高度2k~7 km,全年云闪高度呈下降趋势;雷电强度主要分布在5k~45 kA,平均陡度为7.34 kA/μs。本研究有利于对闪电特征开展更全面的探究和分析,同时对强对流天气监测和预警也有重要意义和价值。     

Inhibition study of red rice polyphenols on pancreatic α-amylase activity by kinetic analysis and molecular docking

This study sought to investigate the possible inhibition mechanism of red rice polyphenols (RRP) on pancreatic α-amylase (PA) activity. RRP showed strong inhibition against PA activity and the half-inhibitory concentration (IC₅₀) value was 3.61 μg/mL. The fluorescence quenching of PA by RRP was a combination of static quenching and dynamic quenching. RRP could aggregate with PA and the physiochemical properties of the aggregates were closely related to the concentration of RRP. Kinetic analysis suggested that the inhibition mode of RRP on PA was reversible inhibition, which was a mixing of competitive inhibition and noncompetitive inhibition. Molecular docking speculated that RRP could form hydrogen bonds with PA by binding to the catalytic active sites (ASP197, GLU233 and ASP300) and the microenvironments of TRP58 and TRP59 were altered, thus inhibiting PA activity.     

An Empirical Analysis of Intellectual Capital and Competitive Advantages of Architecture Design Enterprises

In the era of Knowledge-based Economy,Intellectual Capital(IC)increasingly plays more important role in creation of vale.IC is gradually becoming the core resources for Architecture Design Enterprises(ADEs) to establish their sustainable competitive advantages.On basis of the previous research and practical investigation,the authors summarize and identify the IC's connotation of ADEs in China,analyze inner relevancy between IC and competitive (advantages) of ADEs from systemic angle of view,and carry out empirical study by statistically analyzing 168 ADEs in Zhejiang Province.The results show that there are significant positive relations between IC and competitive advantages of ADEs.     

Effect of microwave radiation on dry bean seed infected with Xanthomonas axonopodis pv. phaseoli with and without the use of chemical seed treatment

Common bacterial blight (Xanthomonas axonopodis pv. phaseoli) is a seed-borne disease that is difficult to control in dry bean (Phaseolus vulgaris L.). Laboratory and field studies were conducted over a two-year period to determine the effect of microwave radiation on navy (cv. Navigator and Envoy) and pinto (cv. AC Ole) bean. Laboratory tests resulted in a 12 to 25% decrease in germination following 50–60 s of radiation, while less than a 10% loss was observed between 0 and 40 s. Pathogen viability was also tested, however the incidence of pathogen infection was low and no correlation was observed between exposure time and the incidence of colonization. In field studies conducted at Morden, MB (2012) and Ridgetown and Exeter, ON (2012–2013) microwave radiation and two chemical seed treatments (copper hydroxide 53.8% and pyraclostrobin + fluxapyroxad + metalaxyl) were evaluated for their effect on emergence, disease infection, seed pick, yield and return on investment. The application of microwave treatment decreased emergence by up to 7%, but did not impact the other parameters measured. Chemical treatment alone or in combination with microwave treatment also did not affect emergence, disease incidence, yield, seed pick, or return on investment.     

Analysis of the characteristic on HCCI autoignition and combustion process of diisobutylene

The homogeneous charge compression ignition (HCCI) characteristics of diisobutylene are studied numerically. Numerical results are in accord with the corresponding experimental data. The influence of some key parameters such as initial pressure, equivalence ratio and constituent on autoignition characteristics is discussed and combustion characteristics of diisobutylene in HCCI engine are analyzed. The results indicate that the ignition delay decreases with the increase of pressure and equivalence ratio. The maximum temperature increases with the rise of equivalence ratio, but it does not change with the variation of initial pressure. The 1 pentene isomer ignites significantly faster than the 2 pentene isomer and the ignition delay for the blend directly depends on the proportions of each isomer. It can be found that diisobutylene shows the single stage autoignition. The maximum heat production rate of the 2 pentene is lower than that of 1 pentene, but the 2 pentene still provides good power performance.     

IC卡技术在林区贮木场应用的研究

简述了ＩＣ卡技术在微机技术构成系统,该系统用于林区贮木场木材进出库管理,可提高汇总统计检验数据的速度及计算精度。效果良好。手持式ＩＣ卡读写器可脱机操作,且灵活方便检验队,小组或木材贸易２对检时可用其进行统计计算。     

鸡传染性鼻炎灭活油乳剂苗的研制

采用抗原性较好的Ａ型和Ｃ型菌株,以矿物油为佐剂制备成Ａ、Ｃ型二价油乳剂灭活菌苗,肌内接种健康鸡,玻片凝集试验表明,免疫后第七天产生凝集抗体,效价达到１：４以上,第十六天效价可达１;８,第二十四天效价高达１：１６,攻毒试验的结果表明,抗体效价达到１：１６时可以抵抗强毒的攻击,田间试验的结果表明,该苗的免疫原性好,安全。     

集成运算放大器非线性应用电路的快速分析方法

提出了分析集成运算放大器非线性应用电路的两条基本规律,介绍了集成运放非线性应用的重要特性——传输特性的快速画法.运用此两条规律和传输特性的快速画法,将使集成运放非线性应用电路的分析更为简捷清晰.文中还列举了许多实例加以论述。