Laser particles with omnidirectional emission for cell tracking

The ability to track individual cells in space over time is crucial to analyzing heterogeneous cell populations.Recently,microlaser particles have emerged as unique optical probes for massively multiplexed single-cell tagging.However,the microlaser far-field emission is inherently direction-dependent,which causes strong intensity fluctuations when the orientation of the particle varies randomly inside cells.Here,we demonstrate a general solution based on the incorporation of nanoscale light scatterers into microlasers.Two schemes are developed by introducing either boundary defects or a scattering layer into microdisk lasers.The resulting laser output is omnidirectional,with the minimum-to-maximum ratio of the angle-dependent intensity improving from 0.007(-24 dB)to>0.23(-6dB).After transfer into live cells in vitro,the omnidirectional laser particles within moving cells could be tracked continuously with high signal-to-noise ratios for 2 h,while conventional microlasers exhibited frequent signal loss causing tracking failure.     

Direct quantification of topological protection in symmetry-protected photonic edge states at telecom wavelengths

Topological on-chip photonics based on tailored photonic crystals(PhCs)that emulate quantum valley-Hall effeas has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information.We present a direct quantitative evaluation of topological photonic edge eigenstates and their transport properties in the telecom wavelength range using phase-resolved near-field optical microscopy.Experimentally visualizing the detailed sub-wavelength structure of these modes propagating along the interface between two topologically non-trivial mirror-symmetric lattices allows us to map their dispersion relation and differentiate between the contributions of several higher-order Bloch harmonics.Selective probing of forward-and backward-propagating modes as defined by their phase velocities enables direct quantification of topological robustness.Studying near-field propagation in controlled defects allows us to extract upper limits of topological protection in on-chip photonic systems in comparison with conventional PhC waveguides.We find that protected edge states are two orders of magnitude more robust than modes of conventional PhC waveguides.This direct experimental quantification of topological robustness comprises a crucial step toward the application of topologically protected guiding in integrated photonics,allowing for unprecedented error-free photonic quantum networks。     

一种消除小直径管道焊接应力技术的数值分析

小直径管道的应力腐蚀问题一直是工程界较难解决的问题，作者针对这一难题，提出了一种新型的消除应力方法——温差形变处理技术。利用MSC．Marc大型通用非线性有限元分析软件，对小直径管道环缝焊接接头的原始残余应力及温差形变法消除残余应力进行了有限元模拟，得到了一系列关于加热位置、加热宽度和加热持续时间的数据和规律。结果表明，采用温差形变处理技术，在内外表面的焊缝处都可以得到零值左右的残余应力，从而为进一步的试验分析工作和工程应用奠定了基础。     

阿钦斯克氧化铝联合企业采用无污水排泄的供水系统

阿钦斯克氧化铝联合企业大多数生产部门都是用水大户。全苏铝镁设计研究院所做的设计中规定主要生产部门采用循环供水。循环供水系统(第一、第二集水站中的水)含有一定     

三水铝石与一水软铝石的自行析出

当把浓铝土矿矿浆加热到160℃时,一水软铝石即析出,并在溶出阶段的热交换器器壁上结疤。在赤泥分离状态下,三小铝石便析出在不含一水软铝石的赤泥里。只有一水软铝石存在于赤泥中,始能析出。在赤泥中含有各种矿物时,针铁矿会对三水铝石的析出显示出最大的种子作用。钙的各种化合物都能控制三水铝石的析出,但不能控制一水软铝石的析出。     

大型铝电解槽停槽后的起动工艺

铝厂生产过程中,由于某些原因供电可能突然中断,引起电解槽事故断电或停槽。而用已知的通电焙烧和二次起动电解槽的方法,即使对中型电解槽,工作量也是非常大的。     

論上部导电电解槽阳极质量的改进

大容量上部导电铝电解槽的阳极质量目前还不如侧部导电电解槽。上部导电电解槽阳极质量降低的主要原因之一,是存在着所谓“二次阳极”或“塞子”的问题,以及与此有关的在阳极底掌上形成的凹坑和裂纹。凹坑和裂纹非但能缩小阳极截面,且能使阳极电流密度提高4～8％及增加阳极糊和瀝清漏入电解质的     

大容量上部导电铝电解槽的自动调整

全苏铝镁研究院、《有色冶金自动装置》设计局和伏尔加格勒铝厂(原斯大林格勒铝厂)进行了大容量上部导电铝电解槽自动化的工作。电解槽的集中自动调整和检测系统于1965年完成,并在该厂的第二系列中推广应     

从铝土矿制取氧化铝时钾碱对焙烧和脱硅过程的影响

综合处理霞石时能制得生产成品之一的苏打和钾碱的混合物,故而有必要研究用以代替烧结法从铝土矿中生产氧化铝所需的苏打的可能性问题。过去曾就钾碱在烧结法各个工序中的性状问题进行了一系列的研究。