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Construction of flower-like MoS_(2)decorated on Cu doped CoZn-ZIF derived N-doped carbon as superior microwave absorber

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Nano Research 2024年第9期17卷 8250-8260页

作者： yun han Di Lan Mengjun han Zihao Xia Jiaxiao Zou Zirui Jia College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China

The rational design of composition nanostructures and morphologies of the carbon-based composites materials has a significant potential for tuning electromagnetic parameters and thereby improving their performance as electromagnetic wave(EMW)*** this work,the flower-like Cu/Co-NC/MoS_(2)(NC=N-doped carbon skeleton)composites were successfully prepared by employing CuCoZn-ZIF(ZIF=zeolitic imidazolate framework)as precursor with subsequent annealing and hydrothermal *** unique flower-like morphology and electromagnetic synergy strategy between components enable the as-obtained Cu/Co-NC/MoS_(2)composites to exhibit outstanding microwave absorption ***,the minimum reflection loss of Cu/Co-NC/MoS_(2)reaches-54.36 dB at 2.7 *** the thickness reduces to 2.2 mm,the maximum effective absorption bandwidth can be achieved as large as 6.72 *** research develops useful ideas for optimizing multicomponent microwave absorbing materials.

关键词： ternary metal-organic frameworks(MOFs) MoS_(2) flower-like morphology microwave absorption

Dynamic Installation Behaviors of A New Hybrid Plate Anchor in Layered Marine Clay

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China Ocean Engineering 2021年第5期35卷 736-749页

作者： LAI Ying ZHU Bin CHEN Chuan HUANG yun-han MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Jiangsu Ocean University Lianyungang 222005China

Layered soil profiles create challenges for foundation installation and detrimentally affect the foundation *** research explored the free-fall penetration behavior of a new dynamically installed plate anchor,the Flying Wing Anchor?,in layered soil *** new concept anchor combines the advantages of low-cost installation of torpedo piles and high efficiency of plate *** is initially installed through free-fall like a torpedo pile,and followed by drag embedment like a plate *** methodology is to perform free-fall penetration tests with a model anchor in a variety of test beds containing marine clays with different profiles of undrained shear strength versus depth.A calibrated prediction model accounting for the effects of strain-rate and stiff layer produces results similar to those from the model *** design curves were developed based on the calibrated analytical model,and are valuable to estimate the impact velocity thresholds of prototype anchor to penetrate through stiff *** free-fall penetration tests indicated that the penetration ability of FWA?increases with the increased impact *** new dynamically embedded plate anchor can penetrate through the stiff layers that would cause problems for the conventional plate anchor,such as the drag embedded anchor,plowing on the top of stiff layer instead of breaking into ***,the new dynamically embedded plate anchor can provide a possible solution for layered soil profiles in deep water.

关键词： layered soils penetration hybrid anchors dynamically installed anchors plate anchors

Free-Fall Penetration Behaviors of A New Dynamically Installed Plate Anchor in Marine Clay

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China Ocean Engineering 2020年第6期34卷 795-805页

作者： LAI Ying HUANG yun-han CHEN Chuan ZHU Bin MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China College of Civil and Harbour Engineering Jiangsu Ocean UniversityLianyungang 222005China

A new dynamically installed plate anchor, the Flying Wing Anchor~?, has been developed as a sustainable anchor concept for deep-water offshore wind turbines. The anchor is firstly installed by free-fall penetration and then followed by drag embedment. If the anchor is subjected to environmental loads, it dives deeper to mobilize a higher capacity. This study presents a series of free-fall penetration tests with model anchors in different weights to assess the anchor behavior during the free-fall penetration performance in one-layer soil with a constant shear strength profile. Anchor velocities and embedment depths were measured by a magnetometer. An energy-based model and a force-based model were calibrated against the test results of model anchors with different weights. Based on the calibrated force-based model, a series of design charts were developed to estimate the embedment depth of anchors in different sizes and with different impact velocities in various marine clays. The framework to plot design charts presented herein can be potentially applied to other dynamically installed anchors to predict embedment depth in engineering practice.

关键词： dynamic anchor dynamic installation plate anchor scale effect design chart

Analysis of retarding effect on α to γ transformation in Fe–C alloy by addition of dispersed particles

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Progress in Natural Science:Materials International 2015年第3期25卷 236-241页

作者： Liang Chen yun han Bin Zhou Jie Gong Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong University Research Institute of Technology Shougang Corporation Schools of Electrical Computer and Energy EngineeringArizona State University

The effects of dispersed second phase particles on α-ferrite(α) to austenite(γ) transformation at 1140 K in Fe–C alloy were studied by means of phase field simulation. According to the simulated results, it was found that the particle could retard the migration of α/γ interface. Importantly,both the morphology of particles and the interfacial energy of particle/matrix(α or γ) interface affect the magnitude of the retarding effect. More specifically, the particles with smaller aspect ratio bring stronger retarding force, and when the interfacial energy of particle/γ interface is larger than that of particle/α interface, the retarding effect also becomes significant. These phenomena could be explained from the viewpoint of change in the total amount of the interfacial energy of the simulation system.

关键词： α/γ Interface Retarding effect Particle morphology Interfacial energy

Kinematics of Non-axially Positioned Vesicles through a Pore

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Chinese Journal of Polymer Science 2020年第7期38卷 776-783,I0008页

作者： yun-Long han Ming-Ming Ding Rui Li Tong-Fei Shi School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

We employ finite element method to investigate the kinematics of non-axially positioned vesicles through a *** complete the coupling between fluid flow and the vesicle membranes,we use the fluid structure interactions with the arbitrary Lagrangian Eulerian *** results demonstrate that the vesicles show different deformations in migration process,in turn an oblique ellipse-shape,slipper-shape,*** find that the rotation angle of non-axially positioned vesicles mainly shows the trend of increase,besides the small fluctuation induced by deformation ***,when the vesicles move towards the axis of the channel,the rotation angle exhibits a decrease because of the decrease of the shear ***,rotation of axially positioned vesicles hardly occur due to symmetrical shear *** results further indicate that the rotation is faster nearby the pore for non-axially positioned *** work answers the mapping between the positions of vesicles and deformed states,as well as the change of rotation angle and rotation velocity,which can provide helpful information on the utilization of vesicles in pharmaceutical,chemical,and physiological processes.

关键词： Vesicles Narrow pore Rotation angle Rotation velocity

Lensing clusters of galaxies in the SDSS-Ⅲ

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Research in Astronomy and Astrophysics 2011年第10期11卷 1185-1198页

作者： Zhong-Lue Wen Jin-Lin han yun-Ying Jiang National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We identify new strong lensing clusters of galaxies from the Sloan Digital Sky Survey Ⅲ （SDSS DR8） by visually inspecting color images of a large sample of clusters of galaxies. We find 68 new clusters showing giant arcs in addition to 30 known lensing systems. Among 68 cases, 13 clusters are ＂almost certain＂ lensing systems with tangential giant arcs, 22 clusters are ＂probable＂ and 31 clusters are ＂pos- sible＂ lensing systems. We also find two exotic systems with blue rings. The giant arcs have angular separations of 2.0jj - 25.7j~ from the bright central galaxies. We note that the rich clusters are more likely to be lensing systems and the separations between the arcs and the central galaxies increase with cluster richness.

关键词： galaxies clusters general -- gravitational lensing

Effect of initial ammonium concentration on a one-stage partial nitrification/anammox biofilm system:Nitrogen removal performance and the microbial community

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Journal of Environmental Sciences 2024年第9期143卷 176-188页

作者： Mengyu Zhou yun han Yang Zhuo Fen Yu Gaoyuan Hu Dangcong Peng School of Municipal and Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Key Laboratory of Northwest Water Resource Environment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China

One-stage partial nitrification coupled with anammox(PN/A)technology effectively reduces the energy consumption of a biological nitrogen removal *** nitrite-oxidizing bacteria(NOB)is essential for this technology to maintain efficient nitrogen removal *** ammonium concentration(IAC)affects the degree of inhibited *** this study,the effect of the IAC on a PN/A biofilm was investigated in a moving bed biofilm *** results showed that nitrogen removal efficiency decreased from 82.49%±1.90%to 64.57%±3.96%after the IAC was reduced from 60 to 20 mg N/L,while the nitrate production ratio increased from 13.87%±0.90%to 26.50%±3.76%.NOB activity increased to1,133.86 mg N/m^(2)/day after the IAC decreased,approximately 4-fold,indicating that the IAC plays an important inhibitory role in *** rate-limiting step in the mature biofilm of the PN/A system is the nitritation process and is not shifted by the *** analysis of the microbial community structure in the biofilm indicates that the IAC was the dominant factor in changes in community *** and *** were the main anammox bacteria,and Nitrosomonas and Nitrospira were the main AOB and NOB,*** did not affect the difference in growth between *** and ***,modulating the IAC promoted the PN/A process with efficient nitrogen removal performance at medium to low ammonium concentrations.

关键词： Biological nitrogen removal Partial nitrification Anammox Ammonium concentration Biofilm

Homocysteine is associated with the progression of non-culprit coronary lesions in elderly acute coronary syndrome patients after percutaneous coronary intervention

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Journal of Geriatric Cardiology 2016年第4期13卷 299-305页

作者： Tian-Wen han Shan-Shan ZHOU Jian-Tao LI Feng TIAN Yang MU Jing JING yun-Feng han yun-Dai CHEN Department of Cardiology Chinese PLA General Hospital Beijing China

Background The influence of homocysteine （Hcy） on the migration and proliferation of vascular smooth muscle cells has been well established. However, the impact of Hcy levels on the progression of non-culprit coronary lesions （NCCLs） is controversial. This study aims to evaluate whether the plasma level of Hcy is related to the progression of NCCLs after percutaneous coronary stent implantation in elderly patients with acute coronary syndrome （ACS）. Methods A total of 223 elderly patients （〉 65 years old） with ACS undergoing stent im- plantation and follow-up coronary angiography were enrolled. Laboratory determination comprised of blood sample evaluation for Hcy was carried out before baseline coronary intervention. The patients were classified into two groups according to the blood Hcy tertiles （〉 15 mmol/L or 〈 15 mmol/L）. Patients were followed up for 12.2 months. NCCL progression was assessed by three-dimensional quantitative coronary angiography. Results A significantly higher ratio of NCCL progression was observed in the group with baseline Hcy concentrations above 15 mmol/L compared to the group with concentrations below 15 mmol/L （41/127, 32.3% vs. 14/96, 14.6%, P = 0.002）. Multivariate Cox regression analysis showed that Hcy and diabetes mellitus were independent risk factors for NCCL progression. The crude haz- ard ratio （HR） of NCCL progression for Hcy level was 1.056 （95% CI： 1.01-1.104, P = 0.015）. The adjusted HR of NCCL progression for Hcy level was 1.024 （95% CI： 1.007-1.042, P = 0.007）. The adjusted HR of NCCL progression for diabetes mellitus was 1.992 （95% CI： 1.15-3.44, P = 0.013）. Conclusions Hcy is an independent risk factor for NCCL progression after 12 months of follow-up in elderly patients with ACS who has undergone percutaneous coronary stenting.

关键词： Coronary angiography Elderly patients Homocysteine Non-culprit coronary lesion Percutaneous coronary intervention

A Modified CES Production Function Model and Its Application in Calculating the Contribution Rate of Energy and Other Influencing Factors to Economic Growth

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Journal of Systems Science and Information 2019年第2期10卷 161-172页

作者： Maolin CHENG Guojun SHI yun han School of Mathematics and Physics Suzhou University of Science and TechnologySuzhou 215009China School of Business Suzhou University of Science and TechnologySuzhou 215009China

In the analysis of economic growth factors, the constant elasticity of substitution(CES)production function model is used to calculate the contribution rates of influencing factors to economic growth. However, the traditional CES production function model fails to consider the staged characteristics of economic growth. Therefore, this study provides a modified model of the CES production function. With regard to its application, a new method for calculating the contribution rates of energy and other influencing factors to economic growth is proposed using a modified CES production function model. This work concludes by calculating the contribution rates of Chinese energy and other influencing factors to economic growth.

关键词： CES production function influencing factors economic growth contribution rate