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Demonstration of electrically injected vertical-cavity surface-emitting lasers with post-supported high-contrast gratings

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Photonics Research 2022年第5期10卷 1170-1176页

作者： JING zHANG chenxi Hao WANHUA zHENG DIETER BIMBERG ANJIN LIU State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Bimberg Chinese-German Center for Green Photonics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Institute of Solid State Physics and Center of Nanophotonics Technische Universitat Berlin10623 BerlinGermany

We experimentally demonstrate for the first time to our knowledge electrically injected vertical-cavity surfaceemitting lasers(VCSELs) with post-supported high-contrast gratings(HCGs) at 940 nm. The HCG-VCSELs have two posts to support the air-suspended HCGs, which are realized by simple fabrication without critical point drying. The HCG-VCSEL achieves a threshold current of about 0.65 m A and a side-mode suppression ratio of 43.6 d B under continuous-wave operation at 25℃. Theoretically the HCG-VCSEL with a λ∕2-cavity for the transverse magnetic polarization has a smaller effective mode length of 1.38 ·(λ∕n). Thus, the relaxation resonance frequency can be increased by 16% compared with that of the conventional VCSEL. The modulation speed of 100 Gbit/s for the HCG-VCSEL is expected in the on–off keying modulation format. Our easy design of HCGVCSELs has great potential for applications in optical interconnects, sensing, illumination, and so on.

关键词： polarization cavity surface

Construction of dual z-scheme Bi2WO6/g-C_(3)N_(4)/black phosphorus quantum dots composites for effective bisphenol A degradation

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Journal of Environmental Sciences 2023年第2期124卷 617-629页

作者： Fuyou Du zhan Lai Huiyang Tang Haiyan Wang chenxi z.ao College of Biological and Environmental Engineering Changsha UniversityChangsha 410022China

In this work,a novel dual z-scheme Bi_(2)WO_(6)/g-C_(3)N_(4)/black phosphorus quantum dots(Bi_(2)WO_(6)/g-C_(3)N_(4)/BPQDs)composites were fabricated and utilized towards photocatalytic degradation of bisphenol A(BPA)under visible-light *** the content of g-C_(3)N_(4) and BPQDs in Bi_(2)WO_(6)/g-C_(3)N_(4)/BPQDs composites to a suitable mass ratio can enhance the visible-light harvesting capacity and increase the charge separation efficiency and the transfer rate of excited-state electrons and holes,resulting in much higher photocatalytic activity for BPA degradation(95.6%,at 20 mg/L in 120 min)than that of Bi2WO6(63.7%),g-C_(3)N_(4)(25.0%),BPQDs(8.5%),and Bi_(2)WO_(6)/g-C_(3)N_(4)(79.6%),*** trapping experiments indicated that photogenerated holes(h+)and superoxide radicals(•O_(2)−)played crucial roles in photocatalytic BPA ***,the possible degradation pathway and photocatalytic mechanism was proposed by analyzing the BPA *** also demonstrated that the Bi2WO6/g-C_(3)N_(4)/BPQDs as effective photocatalystswas stable and have promising potential to remove environmental contaminants from real water samples.

关键词： Dual z-scheme Bi_(2)WO_(6) Graphitic carbon nitride(g-C_(3)N_(4)) Black phosphorus quantum dots (BPQDs) Bisphenol A(BPA)

Stem cell-based bone and dental regeneration: a view of microenvironmental modulation

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International Journal of Oral Science 2019年第3期11卷 161-175页

作者： chenxi zheng Ji Chen Shiyu Liu Yan Jin State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases Center for Tissue Engineering School of Stomatology The Fourth Military Medical University

In modern medicine,bone and dental loss and defects are common and widespread morbidities,for which regenerative therapy has shown great *** stem cells,obtained from various sources and playing an essential role in organ development and postnatal repair,have exhibited enormous potential for regenerating bone and dental ***,mesenchymal stem cells (MSCs)-based bone and dental regeneration mainly includes two strategies: the rescue or mobilization of endogenous MSCs and the application of exogenous MSCs in cytotherapy or tissue ***,the efficacy of MSCbased regeneration is not always fulfilled,especially in diseased ***,the diseased microenvironment not only impairs the regenerative potential of resident MSCs but also controls the therapeutic efficacy of exogenous MSCs,both as donors and ***,approaches targeting a diseased microenvironment have been established,including improving the diseased niche to restore endogenous MSCs,enhancing MSC resistance to a diseased microenvironment and renormalizing the microenvironment to guarantee MSC-mediated ***,the application of extracellular vesicles (EVs) as cell-free therapy has emerged as a promising therapeutic *** this review,we summarize current knowledge regarding the tactics of MSC-based bone and dental regeneration and the decisive role of the microenvironment,emphasizing the therapeutic potential of microenvironment-targeting strategies in bone and dental regenerative medicine.

关键词： stem cells cytotherapy microenvironment

铁尾矿砂蒸压加气轻质混凝土的制备与孔隙结构研究

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矿业研究与开发 2024年第3期44卷 232-238页

作者：王圣杰顾晓薇王屾宇廖晨曦陈明志王青东北大学资源与土木工程学院辽宁沈阳110819 东北大学智慧水利与资源环境科技创新中心辽宁沈阳110819

为改善因铁尾矿砂过量掺入而导致的蒸压加气轻质混凝土宏观孔隙结构劣化问题,研究发气剂(铝粉)掺量、发气剂与稳泡剂(羟丙基甲基纤维素)质量比对铁尾矿砂蒸压加气轻质混凝土宏观孔隙结构的调节作用,以及对试样抗压强度、体积密度、导热... 详细信息

为改善因铁尾矿砂过量掺入而导致的蒸压加气轻质混凝土宏观孔隙结构劣化问题,研究发气剂(铝粉)掺量、发气剂与稳泡剂(羟丙基甲基纤维素)质量比对铁尾矿砂蒸压加气轻质混凝土宏观孔隙结构的调节作用,以及对试样抗压强度、体积密度、导热性能的影响。结果表明,在发气剂和稳泡剂质量比为1∶5的情况下,发气剂掺量为0.09%时,铁尾矿砂蒸压加气轻质混凝土具有适中的抗压强度与体积密度,接近《蒸压加气混凝土砌块》(GB/T 11968—2020)规定的强度等级A2.5、体积密度等级B05的要求。在此基础上,进一步提高稳泡剂掺量至发气剂和稳泡剂质量比为1∶7可以有效提高小微孔隙(孔隙面积≤0.5mm^(2))占比,改善孔隙均匀性,降低孔隙联通率,使铁尾矿砂蒸压加气轻质混凝土单位体积密度下所能承受的压力提高5.19%,导热系数降低6.8%,具备更为优良的抗压及隔热性能。

关键词：铁尾矿砂蒸压加气轻质混凝土稳泡剂羟丙基甲基纤维素孔隙结构

Multi-layer-structured bioactive glass nanopowder for multistage-stimulated hemostasis and wound repair

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Bioactive Materials 2023年第7期25卷 319-332页

作者： Yidan Wang Meng luo Ting Li chenxi Xie Sihua Li Bo Lei Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an710054China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an710054China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710054China Instrument Analysis Center Xi’an Jiaotong UniversityXi’an710054China

Current treatments for full-thickness skin injuries are still unsatisfactory due to the lack of hierarchically stimulated dressings that can integrate the rapid hemostasis,inflammation regulation,and skin tissue remodeling into the one system instead of single-stage *** this work,a multilayer-structured bioactive glass nanopowder(BGN@PTE)is developed by coating the poly-tannic acid andε-polylysine onto the BGN via facile layer-by-layer assembly as an integrative and multilevel dressing for the sequential management of *** comparison to BGN and poly-tannic acid coated BGN,BGN@PTE exhibited the better hemostatic performance because of its multiple dependent approaches to induce the platelet adhesion/activation,red blood cells(RBCs)aggregation and fibrin network ***,the bioactive ions from BGN facilitate the regulation of the inflammatory response while the poly-tannic acid and antibacterialε-polylysine prevent the wound infection,promoting the wound healing during the inflammatory *** addition,BGN@PTE can serve as a reactive oxygen species scavenger,alleviate the oxidation stress in wound injury,induce the cell migration and angiogenesis,and promote the proliferation stage of wound ***,BGN@PTE demonstrated the significantly higher wound repair capacity than the commercial bioglass dressing Dermlin™.This multifunctional BGN@PTE is a potentially valuable dressing for full-thickness wound management and may be expected to extend to the other wounds therapy.

关键词： Bioactive materials Bioceramics Bioactive glass nanoparticles Wound repair

Afterglow Carbon Dots:From Fundamentals to Applications

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Research 2021年第1期2021卷 330-356页

作者： chenxi Peng Xue Chen Meiling Chen Shenci Lu Yu Wang Suli Wu Xiaowang Liu Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Shaanxi Key Laboratory of Flexible ElectronicsXi’an Key Laboratory of Flexible ElectronicsXi’an Key Laboratory of Biomedical Materials&EngineeringXi’an Institute of Flexible ElectronicsInstitute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an710072 ShaanxiChina International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsChina State Key Laboratory of Fine Chemicals Dalian University of Technology2nd Linggong RoadDalian 116024China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjingChina Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China

The ability of carbon dots(CDs)to emit afterglow emission in addition to fluorescence in response to UV-to-visible excitation allows them to be a new class of luminescent *** compared with traditional organic or inorganic afterglow materials,CDs have a set of advantages,including small size,ease of synthesis,and absence of highly toxic metal *** addition,high dependence of their afterglow color output on temperature,excitation wavelength,and aggregation degrees adds remarkable flexibility in the creation of multimode luminescence of CDs without the need for changing their intrinsic *** characteristics make CDs particularly attractive in the fields of sensing,anticounterfeiting,and data *** this review,we first describe the general attributes of afterglow CDs and their fundamental afterglow *** then highlight recent strategic advances in the generation or activation of the afterglow luminescence of *** emphasis is placed on the summarization of their emergent afterglow properties in response to external *** further highlight the emerging applications of afterglow CDs on the basis of their unique optical features and present the key challenges needed to be addressed before the realization of their full practical utility.

关键词： mechanism excitation luminescence

Precipitation and hot deformation behavior of austenitic heat-resistant steels: A review

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Journal of Materials Science & Technology 2017年第12期33卷 1448-1456页

作者： Yinghui zhou Yongchang Liu Xiaosheng zhou chenxi Liu Jianxin Yu Yuan Huang Huijun Li Wenya Li State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science & Engineering Tianjin University School of Materials Science & Engineering Northwestern Polytechnical University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong University

The austenitic heat resistant-steels have been considered as important candidate materials for advanced supercritical boilers, nuclear reactors, super heaters and chemical reactors, due to their favorable combination of high strength, corrosion resistance, perfect mechanical properties, workability and low *** the precipitation behavior of the steels during long-term service at elevated temperature would lead to the deterioration of mechanical properties, it is essential to clarify the evolution of secondary phases in the microstructure of the steels. Here, a summary of recent progress in the precipitation behavior and the coarsening mechanism of various precipitates during aging in austenitic steels is made. Various secondary phases are formed under service conditions, like MX carbonitrides, M_（23）C_6 carbides, z phase, sigma phase and Laves phase. It is found that the coarsening rate of M_（23）C_6 carbides is much higher than that of MX carbonitrides. In order to understand the thermal deformation mechanism, a constitutive equation can be established, and thus obtained processing maps are beneficial to optimizing thermal processing parameters, leading to improved thermal processing properties of steels.

关键词： Austenitic steels Coarsening behavior Hot deformation Microstructure

miR-143-5p和miR-335-5p在宫颈癌组织中的表达及临床意义

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疑难病杂志 2024年第6期23卷 675-680页

作者：陈菁刘岩姜文静刘羽杨晨曦康复大学青岛中心医院/青岛市中心医院肿瘤妇科二科山东青岛266042 青岛市妇女儿童医院产科山东青岛266034 青岛市妇女儿童医院生殖医学中心山东青岛266034

目的分析微小核糖核酸-143-5p(miR-143-5p)和miR-335-5p在宫颈癌组织中的表达及其临床意义。方法选择2018年7月—2020年6月康复大学青岛中心医院/青岛市中心医院肿瘤妇科二科手术治疗的宫颈癌患者120例,随访期间失访5例,根据随访结果将... 详细信息

目的分析微小核糖核酸-143-5p(miR-143-5p)和miR-335-5p在宫颈癌组织中的表达及其临床意义。方法选择2018年7月—2020年6月康复大学青岛中心医院/青岛市中心医院肿瘤妇科二科手术治疗的宫颈癌患者120例,随访期间失访5例,根据随访结果将患者分为预后良好组78例和预后不良组37例;采用实时荧光定量PCR(RT-qPCR)法检测宫颈癌组织及其癌旁组织中miR-143-5p、miR-335-5p的相对表达量;多因素Logistic回归分析影响宫颈癌患者预后的因素;受试者工作特征(ROC)曲线分析miR-143-5p、miR-335-5p预测宫颈癌患者预后的价值。结果癌组织中miR-143-5p、miR-335-5p水平低于癌旁组织(t/P=22.710/z/P=2.346/0.019、2.601/0.009)。结论miR-143-5p、miR-335-5p在宫颈癌组织中呈下调表达,二者联合预测宫颈癌患者预后的价值较高。

关键词：宫颈癌微小核糖核酸-143-5p 微小核糖核酸-335-5p 预后

Local probing of the non-uniform distribution of ferrielectric and antiferroelectric phases

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Nano Research 2023年第2期16卷 3021-3027页

作者： Huimin Qiao Fangping zhuo zhen Liu Jinxing Wang Jeongdae Seo chenxi Wang Jinho Kang Bin Yang Yunseok Kim School of Advanced Materials and Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Research Center for Advanced Materials Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany Department of Physics College of ScienceNortheast Forestry UniversityHarbin 150040China Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin 150080China

Piezoresponse force microscopy(PFM)is an indispensable tool in the investigation of local electromechanical responses and polarization *** acquired data provide spatial information on the local disparity of polarization switching and electromechanical responses,making this technique advantageous over macroscopic *** its widespread application in ferroelectrics,it has rarely been used to investigate the ferrielectric(FiE)behaviors in antiferroelectric(AFE)***,the PFM was utilized to study the local electromechanical behavior and distribution of FiE,and the AFE phases of PbzrO_(3)thin-film were studied,where only the FiE behavior is observable using a macroscopic *** FiE region resembles a ferroelectric material at low voltages but exhibits a unique on-field amplitude response at high *** contrast,the AFE region only yields an observable response at high ***-field simulations reveal the coexistence of AFE and FiE states as well as the phase-transition processes that underpin our experimental *** work illustrates the usefulness of PFM as an analytical tool to characterize AFE/FiE materials and their phase-coexistence behavior,thereby providing insights to guide property modification and potential applications.

关键词： scanning probe microscopy ferrielectrics antiferroelectrics local electromechanical response