A review of liquid crystal spatial light modulators:devices and applications

Spatial light modulators,as dynamic flat-panel optical devices,have witnessed rapid development over the past two decades,concomitant with the advancements in micro-and opto-electronic integration technology.In particular,liquid-crystal spatial light modulator(LC-SLM)technologies have been regarded as versatile tools for generating arbitrary optical fields and tailoring all degrees of freedom beyond just phase and amplitude.These devices have gained significant interest in the nascent field of structured light in space and time,facilitated by their ease of use and real-time light manipulation,fueling both fundamental research and practical applications.Here we provide an overview of the key working principles of LC-SLMs and review the significant progress made to date in their deployment for various applications,covering topics as diverse as beam shaping and steering,holography,optical trapping and tweezers,measurement,wavefront coding,optical vortex,and quantum optics.Finally,we conclude with an outlook on the potential opportunities and technical challenges in this rapidly developing field.

Preliminary Exploration on Design of Green Landscape of Urban Streets: A Case Study of Guangchang East Road in Xihu District of Nanchang City

Urban streets are the main public places for outdoor activities in urban areas. Urban street landscape is the core content of urban landscape,and urban street greening is an essential part of urban landscape streets. With the rapid development of cities,humans have higher and higher requirements for surrounding environment. To this end,this paper makes a preliminary exploration on the green landscape of urban streets. Based on the analysis of the basic concepts and components of green landscape of urban streets,this paper puts forward the role of green landscape of urban streets: practical function,landscape creation function and environment optimization function. Taking the Guangchang East Road in Xihu District of Nanchang City as an example,through field survey,observation and data collection,it found that the main problems of Guangchang East Road,and came up with the recommendations that the design of the greening landscape of Guangchang East Road in the planting and color block matching. It is expected to provide references for the planning and design of urban street greening landscape in the future.

A novel synthetic method of porous and nanoflower-like Al_(2)O_(3)/MoS_(2)catalyst for reduction of SO_(2)to elemental sulfur

MoS_(2)nanoflowers are favored for their potential in the production of elemental sulfur due to abundant surface area and good catalytic performance for reducing SO_(2).A novel synthetic strategy of porous Al_(2)O_(3)supported on the MoS_(2)with nanoflower structure was proposed.The effects of preparation concentration,calcination atmosphere,Al_(2)O_(3)contents on the growth of catalysts with nanoflower structure were systematically studied via X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),Fourier transform infrared(FTIR)spectroscopy,Brunauer–Emmett–Teller(BET).The surface area was increased to 295.502 m^(2)/g and the amount of Lewis acid on the surface of the Al_(2)O_(3)/MoS_(2)catalyst was increased by adjusting the ratio of Al/Mo.The porous and nanoflower structures of Al_(2)O_(3)/MoS_(2)catalysts promoted the sulfur selectivity without inhibiting the catalytic performance of MoS_(2).The conversion of SO_(2)and the selectivity of sulfur were 100%and 92%after 100 h life evaluation.

Practice of reperfusion in patients with ST-segment elevation myocardial infarction in China:findings from the Improving Care for Cardiovascular Disease in China–Acute Coronary Syndrome project

Background:Reperfusion therapy is fundamental for ST-segment elevation myocardial infarction(STEMI).However,the details of contemporary practice and factors associated with reperfusion therapy in China are largely unknown.Therefore,this study aimed to explore reperfusion practice and its associated factors among hospitalized patients with STEMI in China.Methods:Patients with STEMI who were admitted to 159 tertiary hospitals from 30 provinces in China were included in the Improving Care for Cardiovascular Disease in China–Acute Coronary Syndrome project from November 2014 to December 2019.The associations of the characteristics of patients and hospitals with reperfusion were examined using hierarchical logistic regression.The associations between therapies and in-hospital major adverse cardiovascular events were examined with a mixed effects Cox regression model.Results:Among the 59,447 patients,37,485(63.1%)underwent reperfusion,including 4556(7.7%)receiving fibrinolysis and 32,929(55.4%)receiving primary percutaneous coronary intervention(PCI).The reperfusion rate varied across geographical regions(48.0%–73.5%).The overall rate increased from 60.0%to 69.7%from 2014 to 2019,mainly due to an increase in primary PCI within 12 h of symptom onset.Timely PCI,but not fibrinolysis alone,was associated with a decreased risk of inhospital major adverse cardiovascular events compared with no reperfusion,with an adjusted hazard ratio(95%confidence interval)of 0.64(0.54,0.76)for primary PCI at<12 h,0.53(0.37,0.74)for primary PCI at 12 to 24 h,0.46(0.25,0.82)for the pharmaco-invasive strategy,and 0.79(0.54,1.15)for fibrinolysis alone.Conclusions:Nationwide quality improvement initiatives should be strengthened to increase the reperfusion rate and reduce inequality in China.Trial registration:www.ClinicalTrials.gov,NCT02306616。