科创中国

Lesser kestrels Falco naumanni are migratory central-place foragers that breed in dynamic arable landscapes. After arriving from migration, kestrels have no knowledge of the distribution of crops, and consequently prey, around their colony. The energy demand of pairs increases as breeding season progresses, but at the same time prey abundance, and their knowledge on prey distribution, also increases. Wind can have a strong influence on flight cost and kestrels should try to reduce energy expendi- ture when possible. When prey abundance is low, kestrels have little knowledge of prey distribution, and pairs have no chicks, they could reduce foraging flight cost by leaving the colony with tailwinds. When prey is abundant, knowledge on prey distribu- tion has increased, and chick demand is high, kestrels should fly to the most favorable foraging patches. We analyzed foraging trips directions in a lesser kestrel colony along the breeding season and in relation to wind speed and direction. We recorded 664 foraging trips from 19 individuals using GPS-dataloggers. We found that outward flights direction changed from uniform to a concentrated distribution along the season, as prey abundance and individual experience increased. We also found a temporal trend in the angular difference between outward flights and wind directions, with low values early in the season and then increa- sing as expected, but again low values at the end, contrary to expectation. Results suggest changes in kestrels foraging strategy along the season in relation to wind. Kestrels depart more with tailwinds in exploratory flights early in the season, while there is a spurious coincidence in direction to preferred foraging patches and dominant wind direction at the end [Current Zoology 60 (5): 604-615, 2014].

针对弹载加速度数据记录仪在侵彻环境下受到高冲击力易变形或损坏导致测试失败的问题,提出弹载加速度数据记录仪两级缓冲保护结构,一级为高强度钢的机械外壳防护,二级为薄壁金属管填充泡沫铝的缓冲装置。通过实体弹侵彻3层混凝土试验,弹载加速度记录仪能够可靠存储并回读实验数据,证明了在100000 gn 高冲击环境下记录仪的工作可靠性。

汽车行驶记录仪是对车辆行驶速度、时间、里程以及车辆行驶等相关状态信息进行记录、存储并可与其他设备进行通信的数字式电子记录装置。本文基于高效软硬件来构建能够满足更实用需求的汽车行驶记录仪。系统主控采用低功耗、高性能且集成ARM Cortex-M3内核的32位微处理器,其片上资源十分丰富、外围接口电路简单可靠,同时搭配主流外围电路模块,包括展现良好人机交互界面的 T FT 真彩触摸显示屏、GPS定位模块、测量行驶车速的传感器等;软件编程使用丰富的软件函数库以及能够高效管理多任务且免费开源的实时操作系统(RTOS)CooCox CoOS 。

1970年1月生,博士,教授,博士生导师.现任中北大学仪器与电子学院副院长.刘文怡教授主要从事测试计量技术及仪器领域的教学和研究工作,近几年主要针对测量系统从事分布式数据记录系统、无线传感网络、无损压缩编码、数据加密、多功能结构以及新型高速数据传输总线研制工作.在科研方面,承担并完成国家自然科学基金项目、总装备部基础研究项目、兵科院预先研究项目等纵向项目7项,主持和负责企业横向合作项目

影响磁悬浮寻北仪精度的因素可分为高频噪声干扰和低频大能量干扰,为消除基座扰动对磁悬浮寻北仪精度的影响,采用小波预处理消除系统内部高频噪声影响;并提出基于EMD分解干扰点检测的三次样条插值包络均值滤波结合抗差估计的新算法,以有效消除外界低频大能量干扰.对比分析算数均值滤波和最小二乘法的寻北结果精度,计算结果表明,存在外界异常干扰时,提出的处理算法可以得到更高的寻北精度.

频率捷变雷达综合测试仪工作在射频捷变状态,可产生雷达所需的目标回波信号,其跟踪精度将直接影响雷达的测试准确度。本文介绍了捷变参数测试原理,根据系统设计方法将频率跟踪精度的检定在中频进行,并提出了捷变参数检定仪的设计方案。同时对检定仪进行了测试,得到的测频精度优于10 kHz 。

2012年8月2日,慕尼黑-罗德与施瓦茨公司是首个提供3GPPLTE上行MIMO信号测试解决方案的仪器仪表厂商,新发布的R&SFS-K103PC软件选件,配合R&SFSV,R&SFSQ和R&SFSW信号与频谱分析仪,帮助芯片厂商开发未来终端所需的组件.R&SFS-K103PC软件选件满足3GPPLTE标准演进

The?ecological?consequences?of?climate?extreme?events?are?still?poorly?understood,?especially?those?related?to?cold?episodes.?Winter?cold?spells?might?imperil?the?energy?balance?of?small?passerines,?thus?compromising?their?survivorship.?Here?we?analyze?how?the?abundance?and?habitat?use?of?three?tree-gleaning?passerine?species?wintering?in?a?montane?oakwood?of?central?Spain?at?ca.?1,300?m?a.s.1,?was?influenced?by?the?cold?wave?that?hit?Europe?in?February?2012.?We?monitored?temperature,?wind?and?the?relative?abundance?of?great?tit?Parus?major,?blue?tit?Cyanistes?caeruleus?and?long-tailed?tit?Aegithalos?caudatus?in?15?plots?throughout?three?periods:?before,?during?and?after?the?cold?wave.?Our?results?clearly?rule?out?widespread?mortality?and?temporal?migration?of?the?studied?passerine?populations,?as?the?abundance?of?these?species?did?not?diminish?during?the?cold?wave.?Moreover,?the?species?usually?foraging?higher?in?the?tree?canopy?-and?thus?more?exposed?to?windmoved?to?the?less?windy?woodland?plots?(long-tailed?tit)?and?reduced?their?foraging?height?above?ground?during?the?cold?wave?(long-tailed?tit?and?blue?tit),?probably?to?mitigate?the?deleterious?effects?of?wind?chill.?Therefore,?these?forest?birds?were?able?to?cope?with?a?dry?cold?wave?that?was?statistically?extreme?in?terms?of?temperature?and?wind?chill,?according?to?the?historic?climate?records?of?the?region.?It?seems?that,?at?least?when?foraging?substrates?are?not?heavily?covered?by?snow?or?ice,?Mediterranean?birds?can?resist?an?extreme?cold?wave?[Current?Zoology?60?(4):?429-437,?2014].

学术论文作为记载和传承人类文明的载体,其表达的规范性是体现其学术质量的重要组成部分.结构严谨,层次清楚,用词准确,语言通顺,文风清新,表达规范,可读性强的论文,有利于学术信息的交流、传播、存储,是提高学术信息记录质量和促进其有效传播的可靠保证.

为了杜绝部分司机在油罐车运输途中,私自从储油罐中卸油,以STC12C5A60S2单片机为核心,结合阀门开关监测、油量监测、SD卡录像等模块,开发了多功能、智能化的油罐车工况监测仪器.主要介绍了油罐车工况监测仪的硬件和软件设计.按该方案设计的监测仪已投入实际应用,实现了油罐车运输过程中违规卸油的监测和记录,以小票形式打印记录的参数.该监测仪具有良好的功能和性能,界面良好,工作稳定,记录参数稳定可靠,可以满足预期要求.