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Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow‑Electrode capacitive Deionization

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Nano-micro Letters 2025年第2期17卷 1-17页

作者： Ziquan Wang Xiangfeng chen Yuan zhang Jie ma Zhiqun Lin Amor Abdelkader maria‑magdalena Titirici Libo Deng college of chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Research center for Environmental Functional materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China Department of chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore Department of Engineering Faculty of Science and TechnologyBournemouth UniversityTalbot CampusFern BarrowPooleEngland BH125BBUK Institut de chimie de Nice UniversitéCôte d’AzurUMR CNRS 727228 Av.Valrose06108 NiceFrance Department of chemical Engineering Imperial College LondonSouth Kensington CampusExhibition RdLondon SW72AZUK

Low-electrode capacitive deionization(FcDI)is an emerging desalination technology with great potential for removal and/or recycling ions from a range of ***,it still suffers from inefficient charge transfer and ion transport kinetics due to weak turbulence and low electric intensity in flow electrodes,both restricted by the current ***,a new tip-array current collector(designated as T-cc)was developed to replace the conventional planar current collectors,which intensifies both the charge transfer and ion transport *** effects of tip arrays on flow and electric fields were studied by both computational simulations and electrochemical impedance spectroscopy,which revealed the reduction of ion transport barrier,charge transport barrier and internal *** the voltage increased from 1.0 to 1.5 and 2.0 V,the T-cc-based FcDI system(T-FcDI)exhibited average salt removal rates(ASRR)of 0.18,0.50,and 0.89μmol cm^(-2) min^(-1),respectively,which are 1.82,2.65,and 2.48 folds higher than that of the conventional serpentine current collectors,and 1.48,1.67,and 1.49 folds higher than that of the planar current ***,with the solid content in flow electrodes increased from 1 to 5 wt%,the ASRR for T-FcDI increased from 0.29 to 0.50μmol cm^(-2) min^(-1),which are 1.70 and 1.67 folds higher than that of the planar current ***,a salt removal efficiency of 99.89%was achieved with T-FcDI and the charge efficiency remained above 95%after 24 h of operation,thus showing its superior long-term stability.

关键词： Flow-electrode capacitive deionization current collector Tip effect Desalination

Recent advances and future challenges for mobile network virtualization

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Science china(Information Sciences) 2017年第4期60卷 5-16页

作者： Xiaofeng TAO Yan HAN Xiaodong XU Ping zhang Victor c.m.LEUNG National Engineering Lab for mobile Network Technologies Beijing University of Posts and Telecommunications State Key Lab of Networking & Switching Technology Beijing University of Posts and Telecommunications Department of Electrical and computer Engineering The University of British Columbia

Recently, network function virtualization(NFV) was proposed as a paradigm shift in the telecommunication industry. Both industry and academia have drawn significant attention in mobile network *** decouples the software implementation of network functions from the underlying hardware, leading to considerable reductions in operating expenses(OPEX) and capital expenses(cAPEX), and facilitating the network deployment. However, as an emerging technology, NFV brings both challenges and opportunities in developing new architectures, applying and deployment. In this paper, we first survey the related work of NFV, and then propose promising research directions in this area.

关键词： network function virtualization mobile networks software defined networking network functions 5G network slicing

Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for cr(Ⅵ) and P(Ⅴ) removal

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Journal of Environmental Sciences 2014年第12期26卷 2379-2386页

作者： Wei Yao Pinhua Rao Irene m.c.Lo Wenqi zhang Wenrui Zheng School of chemistry and chemical Engineering Shanghai University of Engineering Science Department of civil and Environmental Engineering The Hong Kong University of Science and Technology

Pollutants that exist in anionic species are issues of concern in water treatment. compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties（Qm-chitosan） was prepared and employed to remove chromium（VI） and phosphorus（V）（cr（VI） and P（V）） from aqueous environments. The Qm-chitosan was characterized by Fourier transform infrared spectrometry（FT-IR）,thermogravimetric analysis（TGA）, energy dispersive X-ray（SEm-EDX） and zeta *** experiments show that Qm-chitosan can effectively remove cr（VI） and P（V）, and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of cr（VI） and P（V） removal. The adsorption isotherms of both cr（VI） and P（V） on the Qm-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P（V）（2.783 mmol/g） was found to be higher than that of cr（VI）（2.323 mmol/g）, resulting from the size of the H2PO-4ions being smaller than that of the Hcr O-4ions. However, the theoretical calculation and experimental results showed that Qm-chitosan had a stronger affinity for cr（VI） than P（V）. The adsorption–desorption of the Qm-chitosan was evaluated, and high regeneration rates were demonstrated.

关键词： magnetic chitosan Quaternary ammonium cr(VI) P(V) Adsorption

Evolution of deformation twins with strain rate in a mediummanganese wear-resistant steel Fe-8mn-1c-1.2cr-0.2V

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Journal of Iron and Steel Research International 2019年第9期26卷 983-990页

作者： J. chen J.J.Wang H.zhang W.G.zhang c.m.Liu Key Laboratory for Anisotropy and Texture of materials Ministry of EducationNortheastern UniversityShenyang 110819LiaoningChina School of materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Baosteel Special Steel co. Ltd.Shanghai 200940China Northeastern Institute of metal materials co. Ltd.Shenyang 110108LiaoningChina

microstructure evolutions of the medium-manganese wear-resistant steel Fe-8mn-1c-1.2cr-0.2V (in wt.%) with stacking-fault energy of 22 mJ m-2 during deformation at strain rate ranging of 10^-2-1 s^-1 were analyzed by means of X-ray diffraction, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The results indicate that the twinning-induced plasticity effect is the main strengthening mechanism of the studied steel, whilst the transformation-induced plasticity effect only occurs at high strain rate. With an increase in strain rate, volume fraction of the deformation twins, in particular that of the secondary twins, increases significantly along with decreasing average size. When applied strain rate is higher than 10^-1 s^-1, the parallel deformation twins are turned into a crossing morphology, and the original straight twin boundaries exhibit a ladder feature, which is attributed to the interactions between regular dislocations and twin dislocations at the twin boundary. The critical strain, a key indicator of the initiation of deformation twin, decreases with increasing strain rate. In addition, the ductility and strength of medium-manganese wear-resistant steel Fe-8mn-1c-1.2cr-0.2V are mainly determined by the shape and volume fraction of deformation twins.

关键词： medium-manganese wear-resistant steel Stacking fault Twinning-induced plasticity effect Secondary twin Strain hardening rate

单宁酸改性互穿网络水凝胶促进断裂跟腱术后的组织重塑

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中国组织工程研究 2025年第4期29卷 721-729页

作者：张博张振江东北京大学第三医院运动医学科北京市100191

背景:跟腱断裂术后的再生与重塑是临床治疗的难点,组织工程水凝胶材料为促进跟腱修复提供了可能。目的:探究单宁酸改性互穿网络水凝胶对大鼠断裂跟腱组织再生与重塑的作用。方法:①通过蓝光照射及caSO4溶液浸泡交联制备单宁酸改性互穿... 详细信息

背景:跟腱断裂术后的再生与重塑是临床治疗的难点,组织工程水凝胶材料为促进跟腱修复提供了可能。目的:探究单宁酸改性互穿网络水凝胶对大鼠断裂跟腱组织再生与重塑的作用。方法:①通过蓝光照射及caSO4溶液浸泡交联制备单宁酸改性互穿网络水凝胶,表征水凝胶的微观形貌、力学性能、黏附性能、体外释药性能与生物相容性。②取30只SD大鼠,采用随机数字表法分为假手术组、手术组与水凝胶组,每组10只,后2组建立右后肢跟腱断裂模型,手术组采用改良Kessler法将断裂跟腱重新缝合,水凝胶组采用相同术式缝合断裂跟腱后将单宁酸改性互穿网络水凝胶贴片完全缠绕包裹于断端接合处。术后4周,对断裂跟腱进行影像学检查、组织学评价、生物力学测试及炎症因子水平检测。结果与结论:①扫描电镜下可见单宁酸改性互穿网络水凝胶呈多孔微观结构,孔径为3-10μm,并且水凝胶具备良好的体外释药性能、黏附强度与拉伸强度;ccK-8检测与活/死染色显示,该水凝胶对大鼠骨髓间充质干细胞增殖活性无明显影响,具备良好的生物相容性。②mRI成像显示,与手术组比较,水凝胶组大鼠跟腱呈均一低信号,跟腱前后径厚度减小,与周围组织分界更为明确,表现更接近假手术组。苏木精-伊红与masson染色显示,手术组大鼠跟腱纤维排列松散混乱,细胞密度增加且排布杂乱,伴有明显炎性细胞浸润,部分区域出现腱内骨化;水凝胶组大鼠跟腱纤维排列有序,细胞密度降低且排布规整,炎性细胞浸润明显减少。手术组大鼠跟腱的拉伸强度低于假手术组(PmRNA表达升高(PmRNA表达降低。③结果表明,单宁酸改性互穿网络水凝胶可显著抑制局部炎症反应、促进断裂跟腱组织重塑。

关键词：单宁酸水凝胶互穿网络跟腱断裂组织重塑组织再生

SImULATION OF STEEL cOIL HEAT TRANSFER IN HPH FURNAcE

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Acta metallurgica Sinica(English Letters) 2005年第5期18卷 647-652页

作者： m. Y. Gu G. chen m. c. zhang X. c. Dai School of mechanical and Power Engineering Shanghai Jiaotong University Shanghai 200240 China School of metallurgy and material Anhui University of TechnologyMaanshan 243002 China Bao Shan Iron and Steel corporation Ltd. Shanghai 201900 China

The mathematical model has been estublished for the simulation of steel coil＇s heat transfer during annealing thermal process in HPH （high performance hydrogen） furnace. The equivalent radial thermal conductivity is adopted by statistical analysis regression approach through the combination of a large quantity of production data collected in practice and theoretical analyses. The effect of the number of coils on circulating flow gas is considered for calculating the convection heat transfer coefficient, The temperature within the coil is predicted with the developed model during the annealing cycle including heating process and cooling process. The good consistently between the predicted results and the experimental data has demonstrated that the mathematical model established and the parameters identified by this paper are scientifically feasible and the effective method of calculation for coil equivalent radial heat transfer coefficient and circulating gas flow has been identified successfully, which largely enhances the operability and feasibility of the mathematic- model. This model provides a theoretical basis and an effective means to conduct studies on the impact that foresaid factors may imposed on the steel coil＇s temperature field, to analyze the stress within coils, to realize online control and optimal production and to increase facilily output by increasing heating and cooling rates of coils without producing higher thermal stress.

关键词： furnace equivalent radial thermal conductivity convection heat transfer coefficient simulation

Quaternion Quasi-chebyshev Non-local means for color Image Denoising

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chinese Journal of Electronics 2023年第3期32卷 397-414页

作者： XU Xudong zhang Zhihua m.James c.crabbe School of mathematics Shandong University Wolfson college University of Oxford

Quaternion non-local means(QNLm) denoising algorithm makes full use of high degree self-similarities inside images to suppress the noise, so the similarity metric plays a key role in its denoising *** this study, two improvements have been made for the QNLm: 1) For low level noise, the use of quaternion quasi-chebyshev distance is proposed to measure the similarity of image patches and it has been used to replace the Euclidean distance in the QNLm algorithm. Since the quasi-chebyshev distance measures the maximal distance in all color channels, the similarity of color images measured by quasi-chebyshev distance can capture the structural similarity uniformly for each color channel; 2) For high level noise, quaternion bilateral filtering has been proposed as the preprocessing step in the QNLm algorithm. Denoising simulations were performed on 110 images of landscape, people, and architecture at different noise levels. compared with QNLm, quaternion non-local total variation(QNLTV), and non-local means(NLm)variants(NLTV, NLm after wavelet threshold preprocessing, and the color adaptation of NLm), our novel algorithm not only improved PSNR/SSIm(peak signal to noise rate/structural similarity) and figure of merit values by an average of 2.77 dB/8.96% and 0.0491 respectively, but also reduced processing time.

关键词： Image color analysis Filtering Quaternions Noise reduction color Euclidean distance Filtering algorithms

Single-photon-level light storage with distributed Rydberg excitations in cold atoms

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Frontiers of physics 2022年第2期17卷 25-32页

作者： Hanxiao zhang Jinhui Wu m.Artoni G.c.La Rocca center for Quantum Sciences and School of Physics Northeast Normal UniversityChangchun 130024China Department of Engineering and Information Technology and Istituto Nazionale di Ottica(INO-cNR) Brescia University25133 BresciaItaly Scuola Normale Superiore and cNISm 56126 PisaItaly

We present an improved version of the superatom(SA)model to examine the slow-light dynamics of a few-photons signal field in cold Rydberg atoms with van der Waals(vdW)interactions.A main feature of this version is that it promises consistent estimations on total Rydberg excitations based on dynamic equations of SAs or *** consider two specific cases in which the incident signal field contains more photons with a smaller detuning or less photons with a larger detuning so as to realize the single-photon-level light *** is found that vdW interactions play a significant role even for the slow-light dynamics of a single-photon signal field as distributed Rydberg excitations are inevitable in the picture of dark-state ***,the stored(retrieved)signal field exhibits a clearly asymmetric(more symmetric)profile because its leading and trailing edges undergo different(identical)traveling journeys,and higher storage/retrieval efficiencies with well preserved profiles apply only to weaker and well detuned signal *** findings are crucial to understand the nontrivial interplay of single-photon-level light storage and distributed Rydberg excitations.

关键词： few-photons light storage distributed Rydberg excitation cold Rydberg atom improved superatom model

An improved pulse coupled neural networks model for semantic IoT

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Digital communications and Networks 2024年第3期10卷 557-567页

作者： Rong ma Zhen zhang Yide ma Xiping Hu Edith c.H.Ngai Victor c.m.Leung School of Information Science and Engineering Lanzhou UniversityLanzhou 730000China School of medical Technology Beijing Institute of TechnologyBeijing100081China Department of Electrical and Electronic Engineer The University of Hong KongHong Kong 999077China college of computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China Department of Electrical and computer Engineering the University of British ColumbiaVancouverBC V6T 1Z4Canada

In recent years,the Internet of Things(IoT)has gradually developed applications such as collecting sensory data and building intelligent services,which has led to an explosion in mobile data ***,with the rapid development of artificial intelligence,semantic communication has attracted great attention as a new communication ***,for IoT devices,however,processing image information efficiently in real time is an essential task for the rapid transmission of semantic *** the increase of model parameters in deep learning methods,the model inference time in sensor devices continues to *** contrast,the Pulse coupled Neural Network(PcNN)has fewer parameters,making it more suitable for processing real-time scene tasks such as image segmentation,which lays the foundation for real-time,effective,and accurate image ***,the parameters of PcNN are determined by trial and error,which limits its *** overcome this limitation,an Improved Pulse coupled Neural Networks(IPcNN)model is proposed in this *** IPcNN constructs the connection between the static properties of the input image and the dynamic properties of the neurons,and all its parameters are set adaptively,which avoids the inconvenience of manual setting in traditional methods and improves the adaptability of parameters to different types of *** segmentation results demonstrate the validity and efficiency of the proposed self-adaptive parameter setting method of IPcNN on the gray images and natural images from the matlab and Berkeley Segmentation *** IPcNN method achieves a better segmentation result without training,providing a new solution for the real-time transmission of image semantic information.

关键词： Internet of things(IoT) Semantic information Real-time application Improved pulse coupled neural network Image segmentation