A Novel Multi-Granularity Flexible-Grid Switching Optical-Node Architecture

A novel multi-granularity flexible-grid switching optical-node architecture is proposed in this paper.In our system,the photonic lanterns are used as mode division multiplexing/demultiplexing(MD-Mux/MD-Demux)for selecting mode.The wavelength division multiplexer/demultiplexer(WDMux/WD-Demux)and the fiber bragg gratings(FBGs)are used to select wavelength channels with the various grid.The experimental results show that the transmission bandwidth covers the C+L band,the average transmission loss is-13.4 dB,and the average crosstalk is-30.5 dB.The optical-node architecture is suit for mode division multiplexing(MDM)optical communication system.

Endoscopy demand among county people in southeast China:A cross-sectional study

Objective The popularization of gastroenteroscopy and the introduction of comfortable medical care have further promoted the growth of people's demand,especially the demand for painless endoscopy.This cross-sectional study aims to investigate the current situation and change in county people's demand for endoscopy to promote the development of endoscopy centers in county hospitals in southeast China.Methods From October to December 2021,patients and their family members who came to the Gastroenterology Department in Suichang County People's Hospital of Zhejiang Province were randomly selected to complete the questionnaire.A total of 838 valid questionnaires were collected.Additionally,the original software data of the Endoscopy Center were sampled and retrieved(from October to December every year from 2018 to 2021)for statistical analysis of real-world data.Those who would choose painless endoscopy the next time in the valid questionnaires were included in the painless endoscopy group,while those who would choose ordinary endoscopy the next time were included in the ordinary endoscopy group.Results The stepwise forward binary logistic regression model analysis showed that,patients with“secondhand smoke exposure”were more willing to choose painless endoscopy(OR=1.459,95%CI:1.050-2.028,p=0.025).However,patients with an education level of“primary and below”and“junior high school”,and patients who are suffering from“currently experiencing abdominal distension”,were more willing to choose ordinary endoscopy(OR=0.270,95%CI:0.149-0.488,p<0.001;OR=0.528,95%CI:0.330-0.845,p=0.008;OR=0.536,95%CI:0.334-0.861,p=0.010).Patients with previous experience in painless endoscopy tended to choose painless endoscopy the next time,while patients with previous experience in ordinary endoscopy tended to choose ordinary endoscopy the next time(χ^(2)=140.97,p<0.001).From 2018 to 2021,the proportion of painless endoscopy has increased yearly(p<0.001).Most patients indicated that they would“regularly review gastroenteroscopy”(477/838,56.9%).Conclusions With Suichang County of Zhejiang Province as the representative,the demand for painless endoscopy for people's gastrointestinal cancer detection in southeast China has been increasing yearly.The development of endoscopy centers in county-level hospitals can basically meet the demand growth.Meanwhile,advanced concepts such as comfortable medical care and regular follow-up are gradually popularized at the grassroots level in southeast China.

基于碳化钛衍生的一维纳米材料的制备与应用

碳化钛是一种具有二维层状结构的过渡金属碳化物.在已有研究中,二维碳化钛超薄纳米片易发生紧密堆积,减少了比表面积和可利用的活性位点,进而限制了性能的进一步提升.相比之下,碳化钛衍生的一维纳米结构具有较大的长径比、高比表面积、更多的活性位点,可有效避免紧密堆积、提高离子/电子定向传导能力、缩短响应时间及延长循环寿命.因此,本文归纳了基于碳化钛衍生的一维纳米材料(包括碳化钛纳米带、钛酸盐纳米带和二氧化钛纳米线)的制备和转化机理,详细总结了碳化钛衍生的一维纳米材料在能量存储(钠离子电池、钾离子电池、锂硫电池和超级电容器)、电催化和传感领域的应用,指出了目前研究中仍存在的问题,并对未来的发展进行了展望.

导电Ni3(HITP)2金属有机框架薄膜用于高倍率性能的柔性透明超级电容器

柔性透明超级电容器是智能便携式电子设备的一种关键储能元件.目前.开发具有高倍率性能的柔性透明电极仍面临着重要挑战.本文采用导电Ni3(HITP)2(HITP=2,3,6,7,10,11-六氨基三亚苯)金属有机框架薄膜作为柔性透明超级电容器的电极.当光学透光率为78.4%时,片电阻为51.3Ωsq-1.当电流密度为5μA cm^-2时,Ni3(HITP)2电极的面积电容达1.63 m F cm^-2.非对称Ni3(HITP)2//PEDOT:PSS超级电容器的光学透光率为61%.当电流密度为3μA cm^-2时,面积电容值为1.06 m F cm^-2,当电流密度提高至50倍时,面积电容值保有率为77.4%.Ni3(HITP)2薄膜具有的高导电性、短取向孔和大比表面积等特点,促使Ni3(HITP)2电极具有低扩散电阻和高离子可及性的协同优势,进而表现出高倍率性能.

Ultrathin Ti_(3)C_(2) nanowires derived from multi-layered bulks for high-performance hydrogen evolution reaction

One-dimensional ultrathin nanowires(NWs)offer a great deal of promising properties for electrochemical energy storage and conversion due to their nanoscale confinement effect and high surface-to-volume ratios.It is highly desirable to precisely design and synthesize ultrathin Ti_(3)C_(2)NWs in the aspect of size,crystalline structure and composition.Here,we report a simple alkalization strategy to design the ultrathin Ti_(3)C_(2)NWs for hydrogen evolution reaction(HER)by modulating the surface-active sites.The design principle can well improve the amount of the defect sites and ion accessibility to increase the interactions between Ti_(3)C_(2)NWs and H^(*).The optimized Ti_(3)C_(2)NWs achieve an overpotential of 476 mV at the current density of 10 mA/cm^(2)and a Tafel slope of 129 mV/dec for HER catalysis,which are superior to that of Ti_(3)C_(2)nanosheets and m-Ti_(3)C_(2).It paves an avenue for the rational transformation of MXene bulks to one-dimensional NWs catalysts for HER.