蓝细菌体系中外噪音维持的生物钟

采用数值模拟方法 ,研究了外部色噪音对蓝细菌生物钟体系的影响。结果表明,外噪音可以在体系的确定性稳态区诱导产生振荡和相干共振;在确定性振荡区,外噪音对振荡起到了破坏性作用,但是振荡的周期并没有随着外噪音的增加而明显变化,说明体系对外噪音具有鲁棒性;而在右侧分叉点附近的确定性振荡区,也发现了外噪音诱导相干共振现象。另外,研究了噪音相关时间的影响,发现其与噪音强度起相反的作用。     

从感知到思考探究 从探究到实践

主动变换角色,让学生成为学习的主人,我变成引导和辅助的地位。课堂主体的变更——课堂教学核心的定位。变＂给＂为＂得＂,由思而得——教学改革的必由之路。     

网络舆情群体极化动力模型与仿真分析

分析了网络舆情群体极化现象,提出网络舆情群体极化包括4种现象:单极聚化、两极裂化、多极碎化和零极淡化。研究网络舆情群体极化的影响因素,揭示群体极化影响因素之间的动力关系,构建网络舆情群体极化动力模型。通过对模型仿真的结果分析,验证模型的有效性,为政府和企业监管网络舆情提供了决策思路和方法指导。     

DPSK调制格式在40 Gbit/s单信道中传输特性分析

分析了DPSK调制格式的产生方式和频域特性,在分别考虑色散、PMD和非线性效应的情况下,通过求解非线性薛定谔方程,仿真了NRZ-DPSK,33%RZ-DPSK,50%RZ-DPSK和CSRZ-DPSK调制格式在40 Gbit/s单信道中的传输特性.仿真结果表明,在单独考虑色散和PMD的情况下,33%RZ-DPSK调制格式特性较好,在综合考虑色散、PMD和非线性效应情况下,CSRZ-DPSK调制格式特性更好.     

电磁感应透明物理机制的解释

利用半经典理论,以A型三能级原子系统为例,研究了电磁感应透明的物理机制．通过暗态、缀饰态和密度矩阵方程三种理论,解释了当激光场与原子系统相互作用时,原子在光场诱导的跃迁通道间发生量子相干效应是出现电磁感应透明的原因．     

喙尾琵琶甲流浸膏的镇痛及抗炎作用研究

目的：观察喙尾琵琶甲流浸膏对小鼠的镇痛及抗炎作用。方法：用热板法和醋酸扭体法测定小鼠的痛阈值,二甲苯耳肿胀法测定抗炎作用。结果：喙尾琵琶甲流浸膏高、低剂量组均能提高扭体小鼠痛阈值,高剂量组能显著提高热板实验小鼠痛阈值;喙尾琵琶甲抗炎作用不明显。结论：喙尾琵琶甲流浸膏具有明显的镇痛作用,抗炎作用不明显。     

基尔霍夫定律在感生电场中的应用

处于感生电场中的导体可以引入电势的概念,利用磁电型电压表对该电势（差）进行测量时,电压表连接的位置或方式不同,则测量结果亦不同。利用基尔霍夫定律能够正确和方便地解释这个现象,并计算这个电势（差）。     

The effect of toxicity on COVID-19 news network formation in political subcommunities on Reddit: An affiliation network approach

Political polarization remains perhaps the “greatest barrier” to effective COVID-19 pandemic mitigation measures in the United States. Social media has been implicated in fueling this polarization. In this paper, we uncover the network of COVID-19 related news sources shared to 30 politically biased and 2 neutral subcommunities on Reddit. We find, using exponential random graph modeling, that news sources associated with highly toxic – “rude, disrespectful” – content are more likely to be shared across political subreddits. We also find homophily according to toxicity levels in the network of online news sources. Our findings suggest that news sources associated with high toxicity are rewarded with prominent positions in the resultant network. The toxicity in COVID-19 discussions may fuel political polarization by denigrating ideological opponents and politicizing responses to the COVID-19 pandemic, all to the detriment of mitigation measures. Public health practitioners should monitor toxicity in public online discussions to familiarize themselves with emerging political arguments that threaten adherence to public health crises management. We also recommend, based on our findings, that social media platforms algorithmically promote neutral and scientific news sources to reduce toxic discussion in subcommunities and encourage compliance with public health recommendations in the fight against COVID-19.     

Bio-inspired untethered fully soft robots in liquid actuated by induced energy gradients

Soft robotics with new designs, fabrication technologies and control strategies inspired by nature have been totally changing our view on robotics. To fully exploit their potential in practical applications, untethered designs are preferred in implementation. However, hindered by the limited thermal/mechanical performance of soft materials, it has been always challenging for researchers to implement untethered solutions, which generally involve rigid forms of high energy-density power sources or high energy-density processes. A number of insects in nature, such as rove beetles, can gain a burst of kinetic energy from the induced surface-energy gradient on water to return to their familiar habitats, which is generally known as Marangoni propulsion. Inspired by such a behavior, we report the agile untethered mobility of a fully soft robot in liquid based on induced energy gradients and also develop corresponding fabrication and maneuvering strategies. The robot can reach a speed of 5.5 body lengths per second, which is 7-fold more than the best reported, 0.69 (body length per second), in the previous work on untethered soft robots in liquid by far. Further controlling the robots, we demonstrate a soft-robot swarm that can approach a target simultaneously to assure a hit with high accuracy. Without employing any high energy-density power sources or processes, our robot exhibits many attractive merits, such as quietness, no mechanical wear, no thermal fatigue, invisibility and ease of robot fabrication, which may potentially impact many fields in the future.     

大学生群体极化现象的社会心理学分析

群体极化现象是指群体成员一开始具有某种偏向,在经过讨论后群体朝偏向的方向继续移动,直至形成极端的结果。大学生是一个特殊的群体,他们朝气蓬勃、富于激情,看重个人名誉,充满正义感,具备较强的集体观念,组织性纪律性强。大学生的这些特征也使得这一群体在事实上更加容易发生极端化的情况。防治大学生群体极化要从重视传统,加强极端化后果教育,注重观点和意见的多样性与平衡,融入协商民主理念等多个方面共同着手。