能量异构传感器网络中的分布式数据收集算法

针对无线传感器网络分簇过程中簇头耗能过快问题,提出了一种综合节点剩余能量和节点位置进簇头选取的分布式数据收集算法.在每轮的簇头选取中,算法考虑了簇内节点的剩余能量和所有节点的平均剩余能量,并依据节点的位置优化簇头的选择.算法在保证网络最优簇头个数的同时,避免了能量较低的节点当选为簇头.仿真结果表明,本算法与LEACH和...     

网络在线教育中情感模型的设计

随着计算机网络与通信、心理学、人工智能等技术的飞速发展,人们的生活、学习及工作方式也随之改变,利用网络进行在线教育的模式越来越受到人们的欢迎。在在线教育中通过对情感进行建模,可以感知到学习者在学习过程中的情感状态,并实时地映射出教学的指导状态,使教师在教学过程中更好地对学生进行指导,通过对情感感知模块进行功能测试验证该...     

Radon变换与功率谱结合的PSA图像倾斜度自动校正算法

针对卟啉传感阵列(PSA)图像中卟啉点阵列可能发生倾斜的现象,设计了一种自动校正算法.算法之初对图像进行滤波、对比度增强操作,并求得图像的二值形态学边界,利用此二值边界图像作为求取倾斜角度运算的输入,减少了噪声的影响,同时也降低了时间的花费;而后利用radon变换与功率谱结合的方法来求取倾斜角度,解决了单纯的radon...     

科学史上"真理沉睡"的原因及启示

科学史上,有不少"真理沉睡"的事例,分析发现:既有内在原因,也有外在原因;内在原因是理论自身表述不够完善,缺乏应有的实践指称,相关学科发展滞后,仪器技术水平落后等;外在原因是意识形态的遏制、权威的压制、范式理论的束缚和时代认识水平的限制等.从中可以得到如下启示:作为年轻的科学工作者要敢于冲破范式理论的束缚,学术上应该追求完善,面对权威和习俗的阻力需要策略和冷静;作为知名科学前辈要有与时俱进的思想品格和精心育人的意识.     

Application of microscopical techniques in the study of autolysosome dynamics in PC12 neurites

Autophagy is a principal degradation pathway for the turnover of intracellular proteins or cytoplasmic organelles in response to starvation. During autophagic activation, autophagosomes fuse with lysosomes to form autolysosomes where incorporated materials are degraded. However, the dynamics of autolysosomes in neurites of live cells was still poorly known. In this study, various subsets of microscope were applied to analyse the autophagy induction and highly dynamic transport of autolysosomes in rat PC12 neurites. Beading formation was found in degenerating PC12 neurites under phase contrast light microscope after serum deprivation. The monomeric red fluorescence protein‐green fluorescence protein‐light chain 3–labelled autolysosomes accumulated throughout PC12 neurites after 18 h of serum deprivation as revealed by fluorescence microscope analysis. The single‐membrane autolysosomes were also visualized in PC12 cells under transmission electron microscope. Moreover, fluorescence recovery after photobleaching experiment, which was conducted by confocal laser scanning microscope, demonstrated that autolysosomes were motile vesicles and moved along PC12 neurites during starvation. The directional transport of monomeric red fluorescence protein ‐labelled autolysosomes in neurites was further monitored by a motorized video microscope. Both anterograde and retrograde transport of autolysosomes were observed. In addition, the autolysosomes were precisely mapped by using 2D Gaussian fitting and then their highly dynamic movement was robustly tracked by using multidimensional assignment. Collectively, by using different microscopical techniques, our results confirmed the dynamic transport of autolysosomes in starved PC12 neurites and may provide valuable insight into understanding the biophysical characteristics of autolysosomes in neurites under physiological and pathological conditions.     

基于GPS的配电变压器缺相故障快速定位系统

针对配电变压器缺相故障带来的危害与影响,提出基于GPS的配电变压器缺相故障快速定位系统。根据监测变压器副边电压的大小来确定变压器是否发生缺相故障,缺相故障信息由GSM网络发送到监控中心,监控中心收到信息后,在负责人的GPS位置中计算出距离该台缺相变压器最近的责任人,并通过监控中心的GSM模块发送缺相信息给相应的负责人,实现变压器缺相故障快速定位的目的。     

Er3+2.79μm激光器转镜调Q系统的特性分析

当YSGG、GGG、GSGG、YAG、YLF作为基质材料时，Er3+的4I11/2 能级和4I13/2 能级之间能够跃迁产生2.7~3μm的激光，该波段激光在医疗、军事等方面有着重要的应用价值。在790nm泵浦光作用下，Er:YSGG作为工作物质可产生2.79μm激光。通过构建Er:YSGG能级跃迁的速率方程，对转镜调Q激光器的系统特性进行了理论分析，并在此基础上进行数值模拟，得出了在给定激光工作物质参数的情况下，系统的各个变量对转镜调Q激光器性能的影响。这些结论将为类似实验的设计和改进提供理论指导。     

天然裂缝凝析气藏水平井试井模型研究

根据凝析气在多孔介质中渗流时的相变特征,建立凝析油气两相渗流方程,利用凝析油气两相拟压力函数,将渗流方程线性化;建立适合于凝析气藏水平井实际情况的三区复合油气渗流模型,求出井底压力解;绘制不同水平、顶底边界下的样板曲线,分析井底压力动态变化及其影响因素.该模型符合凝析气藏水平井开采过程的实际情况,对天然裂缝凝析气藏开采具有指导意义.     

轮胎硫化循环水压力控制

介绍了采用主管路直接调节取代旁路调节的方法，控制轮胎硫化循环水的压力，以满足工艺要求，且节能效果显著。