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Facile fabrication of graphene/g-C_(3)N_(4) for electromagnetic wave absorption

Nano Research 2024年第3期17卷 1687-1698页

作者： Qiang Su yunfei He Dongdong Liu Daguang Li Long xia xiaoxiao Huang Bo Zhong School of Materials Science and Engineering Harbin Institute of Technology WeihaiWeihai 264209China Weihai Yunshan Technology Co. Ltd.Weihai 264200China State Key Laboratory on Integrated Optoelectronics College of Electronic Science&EngineeringJilin UniversityChangchun 130012China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

With the development of the miniaturization of electronic equipment and lightweight weapon equipment,there are new requirements for electromagnetic wave absorption material(EMWAM).EMWAM has outstanding electromagnetic wave absorption properties and lightweight characteristics become an important direction of research.In this study,graphene/g-C_(3)N_(4)(GGCN)EMWAM was first synthesized in situ by simple heat treatment,in which the g-C_(3)N_(4) had a porous structure and dispersed on the surface of graphene.The impedance matching of the GGCN was well adjusted by decreasing the dielectric constant and attenuation constant due to the g-C_(3)N_(4) semiconductor property and the graphite-like structure.The EMW loss mechanism of GGCN was also analyzed by simulating GGCN’s electric field mode distribution and resistance loss power density.The analysis result shows that the distribution of g-C_(3)N_(4) among GGCN sheets can produce more polarization effects and relaxation effects by increasing the lamellar spacing.Furthermore,the polarization loss of GGCN could be increased successfully by porous g-C_(3)N_(4).Ultimately,the EMW absorption property of GGCN is optimized significantly,and GGCN exhibits excellent EMW absorption performance.When the thickness is 2 mm,the effective absorption bandwidth(EAB)can reach 4.6 GHz,and when the thickness is 4.5 mm,the minimum reflection loss(RLmin)at 4.56 GHz can reach-34.69 dB.Moreover,the practical application of EMWAM was studied by radar cross-section(RCS)simulation,showing that GGCN has a good application prospect.

关键词： graphene/g-C_(3)N_(4) impedance matching simulation analysis dielectric loss excellent electromagnetic wave absorption

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Direct capture efficiency of range hoods in the confined kitchen space

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Building Simulation 2022年第10期15卷 1799-1813页

作者： Changsheng Cao Wuhao Xie yunfei xia Jun Gao School of Mechanical Engineering Tongji UniversityShanghai 200092China

Range hood is a local ventilation device applied widely in residential kitchen for maintaining healthy environment. This study firstly defines the direct capture efficiency (DCE) based on the two-zone model in a confined kitchen space. A mass flux ratio of the secondary captured pollutant to the entrained pollutant from the room zone is proposed for the determination of DCE, where the distribution coefficient is firstly solved, and then its sensitivity analysis on the DCE is carried out. To validate the mass flux ratio and concisely identify the DCE, a virtual purification method that artificially sets the escaped pollutant to zero, is further applied. Compared with the newly developed DCE, the existing indexes, such as contaminant removal efficiency (CRE), total capture efficiency (TCE), fail to differentiate the direct capture from the total capture. Finally, the effects of such factors as makeup airflow pattern, exhaust flow rate, cooking source temperature and the individual occupied/unoccupied on the DCE are fully studied. It is confirmed that different makeup airflow pattern results in distinguished airflow distribution, which makes a significant difference of more than 30% in DCE. Over 50% increase of DCE can be achieved when the exhaust flow rate is increased from 300 to 600 m3/h. About 30% decrease of DCE is observed with the increased cooking source temperature from 100 to 300 °C, and 10% increase of DCE is appeared in the individual occupied case. This reasonable definition and determination of DCE would help to improve the real capture performance of range hoods.

关键词： kitchen ventilation capture efficiency air distribution local exhaust makeup airflow

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Void fraction for random loose packing of the cylindrical particles considering filling rate,material and shape

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Particuology 2022年第4期20卷 35-46页

作者： Chengquan Zhang Jun Gao Yukun Xu yunfei xia xiaobin Wei Xing Su Lingjie Zeng School of Mechanical Engineering Tongji UniversityShanghaiChina

Particle packing is widely applied in organic pollutant adsorption,catalytic reaction.biomass combustion,nuclear cooling,and other scenarios.Due to the complexity of the shape,the studies on the void fraction of the cylindrical particles are not as thorough as the spherical particles.This study investigated the influence of the flling rate,material properties and sphericity on the void fraction of cylinders through experiments and simulation.DEM(discrete element method)was validated by the internal structures of the packing obtained by CT(computed tomography).Based on the logarithmic correlation between the void fraction and flling rate,an ingenious framework for predicting the void fraction of cylindrical particles was presented with two intermediate coefficients.By correlating the coefficients with the material property and sphericity,a novel void-fraction prediction model was established with R-squared of 0.996.The mechanism of void fraction under random loose packing for cylinders was eventually found in this study.

关键词： Void fraction Random loose packing Cylindrical particles Prediction model DEM

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Mannose metabolism and immune regulation:Insights into its therapeutic potential in immunology-related diseases

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BIOCELL 2023年第11期47卷 2535-2546页

作者： QINGPAN BU PING LI yunfei xia XINPEI WEI KAI SONG School of Life Sciences Changchun Normal UniversityChangchun130032China

Mannose,a different isomer of the hydroxyl group at the C-2 position of glucose,shares the same transport carrier protein with glucose to enter cells and participate in the regulation of glucose metabolism.It affects cell growth,differentiation,and function and plays an active role in tumor immunity and inflammatory processes.This paper provides theoretical support for expanding the clinical applications of mannose by exploring its constitution,metabolic pathways,and role in regulating immune cell function and treating immunology-related diseases.

关键词： Mannose Metabolism Immune cell Immune regulation

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改良全埋垂直褥式减张缝合与皮内连续缝合对儿童手术切口愈合以及瘢痕形成的影响

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临床小儿外科杂志 2024年第4期23卷 377-381页

作者：夏云菲施佳上海交通大学医学院附属新华医院妇科上海上海交通大学医学院附属新华医院儿普外科上海

目的皮内连续缝合(intradermic continuous suture, ICS)是临床上常用的缝合方法之一, 但因减张效果不足容易导致瘢痕增生;改良全埋垂直褥式减张缝合(modified fully buried vertical mattress suture, MFBVMS)在整形外科应用广泛, 具... 详细信息

目的皮内连续缝合(intradermic continuous suture, ICS)是临床上常用的缝合方法之一, 但因减张效果不足容易导致瘢痕增生;改良全埋垂直褥式减张缝合(modified fully buried vertical mattress suture, MFBVMS)在整形外科应用广泛, 具有良好的减张效果;本研究旨在比较MFBVMS和ICS对伤口愈合以及瘢痕形成的影响。方法本研究为前瞻性研究, 选择2022年1月至8月于上海交通大学医学院附属新华医院儿普外科行开放手术的70例患儿作为研究对象, 使用信封法随机分为观察组和对照组, 每组各35例;观察组采取MFBVMS, 对照组采取ICS, 比较两组患儿缝合时间、切口愈合等级、术后1个月、6个月所测量瘢痕宽度以及温哥华评估量表(vancouver scar scale, VSS)评分结果, 观察两组患儿切口不良反应发生情况。结果观察组缝合时间(16.66±6.35)min, 长于对照组的(7.20±3.48)min, 差异有统计学意义(t=-7.729, P<0.001)。术后6个月观察组瘢痕宽度(1.13±0.53)mm, 小于对照组的(2.49±1.03)mm, 差异有统计学意义(t=6.920, P<0.001);VSS评分(3.69±1.13)分, 小于对照组的(5.49±1.25)分, 差异有统计学意义(t=6.352, P<0.001)。观察组手术后无一例切口不良反应发生, 与对照组11.43%的切口不良反应率相比, 差异有统计学意义(χ2=4.242, P<0.05);观察组切口愈合时间(6.77±0.55)d, 小于对照组的(7.83±2.47)d, 差异有统计学意义(t=2.475, P<0.05)。结论 MFBVMS应用于儿童手术能明显减少切口瘢痕形成, 改善切口愈合质量。

关键词：外科伤口伤口缝合技术瘢痕治疗结果儿童

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Anti-wear beam effects on gas-solid hydrodynamics in a circulating fluidized bed

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Particuology 2015年第2期13卷 173-184页

作者： yunfei xia Leming Cheng Chunjiang Yu Linjie Xu Qinhui Wang Mengxiang Fang State Key Laboratory of Clean Energy Utilization Zhejiang University

Anti-wear beams installed on water walls of circulating fluidized bed （CFB） boilers are one of the most effective ways to protect against water-wall erosion. Beam effects from, for example, beam size and superficial gas velocity were investigated on gas-solid hydrodynamics in a CFB test rig using CFD simulations and experimental methods. The downward flow of the wall layer solids is observed to be disrupted by the beam but is then restored some distance further downstream. When falling solids from the wall layer hit the anti-wear beam, the velocity of the falling solids decreases rapidly. A fraction of the solids accumulates on the beam. Below the beams, the falling solids have reduced velocities but upward-moving solids were observed on the wall. The effect of the beam increases with width and superficial gas velocity. Wear occurs mainly above the beam and its variation with width is different above to below the beam. There is an optimum width that, when combined with beam height, results in less erosion.

关键词： Circulating fluidized bed Gas-solid hydrodynamics Anti-wear beam

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Revalidation of a prognostic score model based on complete blood count for nasopharyngeal carcinoma through a prospective study

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Chinese Journal of Cancer Research 2016年第5期28卷 467-477页

作者： xiaohui Li Hui Chang Yalan Tao xiaohui Wang Jin Gao Wenwen Zhang Chen Chen yunfei xia Department of Radiation Oncology Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South China Collaborative Innovation Center of Cancer Medicine Guangzhou 510060 China Department of Oncology the 421 Hospital of Chinese People's Liberation Army Guangzhou 510318 China Department of Radiation Oncology Anhui Provincial Hospital Affiliated to Anhui Medical University Hefei 230001 China

Objective： In our previous work, we incorporated complete blood count （CBC） into TNM stage to develop a new prognostic score model, which was validated to improve prediction efficiency of TNM stage for nasopharyngeal carcinoma （NPC）. The purpose of this study was to revalidate the accuracy of the model, and its superiority to TNM stage, through data from a prospective study.Methods： CBC of 249 eligible patients from the 863 Program No. 2006AA02Z4B4 was evaluated. Prognostic index （PI） of each patient was calculated according to the score model. Then they were divided by the PI into three categories： the low-, intermediate-and high-risk patients. The 5-year disease-specific survival （DSS） of the three categories was compared by a log-rank test. The model and TNM stage （Tth edition） were compared on efficiency for predicting the 5-year DSS, through comparison of the area under curve （AUC） of their receiver-operating characteristic curves.Results： The 5-year DSS of the low-, intermediate- and high-risk patients were 96.0%, 79.1% and 62.2%, respectively. The low- and intermediate-risk patients had better DSS than the high-risk patients （P〈0.001 and P〈0.005, respectively）. And there was a trend of better DSS in the low-risk patients, compared with the intermediate-risk patients （P=0.049）. The AUC of the model was larger than that of TNM stage （0.726 vs. 0.661, P：0.023）. Conclusions： A CBC-based prognostic score model was revalidated to be accurate and superior to TNM stage on predicting 5-year DSS of NPC.

关键词： Complete blood count score model revalidadon disease-specific survival nasopharyngeal carcinoma

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无背索斜拉桥混凝土斜塔施工方法研究

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北方交通 2024年第5期 4-8页

作者：夏云飞王帅河南省交通规划设计研究院股份有限公司郑州市450000

斜塔施工是无背索斜拉桥施工技术的重难点之一。若施工方案选择不当,会存留安全隐患甚至导致严重的工程质量问题。为研究无背索斜拉桥斜塔合理施工方法,首先对混凝土斜塔的施工难点、自重受力以及模板和支架受力进行分析,随后从安全性... 详细信息

斜塔施工是无背索斜拉桥施工技术的重难点之一。若施工方案选择不当,会存留安全隐患甚至导致严重的工程质量问题。为研究无背索斜拉桥斜塔合理施工方法,首先对混凝土斜塔的施工难点、自重受力以及模板和支架受力进行分析,随后从安全性、经济性及适用性角度出发,确定斜塔施工方法和需要注意的问题。研究认为,倾角α较小时,若工期和地基条件满足要求,应当优先选用满堂支架法;倾角α较大时,需进行多方案比选。

关键词：无背索斜拉桥斜塔施工技术受力分析

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Recent advances in high-loading catalysts for low-temperature fuel cells: From nanoparticle to single atom

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SusMat 2021年第4期1卷 569-592页

作者： Lixiao Shen Miao Ma Fengdi Tu Zigang Zhao yunfei xia Kokswee Goh Lei Zhao Zhenbo Wang Guangjie Shao College of Environment and Chemical Engineering State Key Laboratory of Metastable Materials Science and TechnologyHebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseYanshan UniversityQinhuangdaoP.R.China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Lab of Urban Water Resource and EnvironmentSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinP.R.China

Low-temperature fuel cells(LTFCs)are considered to be one of the most promising power sources for widespread application in sustainable and renew-able energy conversion technologies.Although remarkable advances have been made in the mass activity of catalysts,mass transport impedance needs to be urgently addressed at a well-designed membrane electrode assembly(MEA)scale.Increasing the loading of electrocatalysts is conducive to prepare thinner and more efficient MEAs owing to the resulting enhanced reactant permeability,better proton diffusion,and lower electrical resistance.Herein,recent progress in high-loading(≥40 wt.%)Pt nanoparticle catalysts(NPCs)and high-loading(≥2 wt.%)single-atom catalysts(SACs)for LTFC applications are reviewed.A summary of various synthetic approaches and support materials for high-loading Pt NPCs and SACs is systematically presented.The influences of high surface area and appropriate surface functionalization for Pt NPCs,as well as coordina-tion environment,spatial confinement effect,and strong metal-support interac-tions(SMSI)for SACs are highlighted.Additionally,this review presents some ideas regarding challenges and future opportunities of high-loading catalysts in the application of LTFCs.

关键词： high-loading catalysts low-temperature fuel cells membrane electrode assembly nanoparticle catalysts single-atom catalysts

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Target delineation and dose prescription of adaptive replanning intensity-modulated radiotherapy for nasopharyngeal carcinoma

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Cancer Communications 2019年第1期39卷 174-177页

作者： Dehuan Xie Wanqin Cheng Shaowen Lv Rui Zhong Lei Wang Jiang Hu Mingli Wang Shaomin Huang Yong Su yunfei xia Department of Radiation Oncology Sun Yat-Sen University Cancer CenterState Key Laboratory of Oncology in Southern ChinaCollaborative Innovation Center for Cancer Medicine651 Dong Feng Road EastGuangzhou 510060GuangdongP.R.China Department of Oncology Shunde Hospital of Southern Medical UniversityFoshan 528399GuangdongP.R.China Department of Radiation Oncology Hainan General HospitalHaikou 570100HainanP.R.China Department of Radiation Oncology National Cancer Center/Cancer Hospital&Shenzhen HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeShenzhen 518116GuangdongP.R.China

Dear Editor,Intensity-modulated radiotherapy(IMRT)has a distinct advantage of high conformity and is an appropriate tech-nique for treating nasopharyngeal carcinoma(NPC).Pre-vious studies have demonstrated that anatomical changes in the external contour,shape,and location of the target and critical structures are significant and result in dosi-metric changes[1,2].Patients’quality of life and clini-cal outcomes might be improved by IMRT replanning[3].Therefore,replanning strategies should be consid-ered instead of single-planning strategies throughout the entire course of radiotherapy.However,there are sub-stantial controversies on(1)the appropriate time for tar-get redelineation,(2)how to modify the target volumes,and(3)how to evaluate the modified plans.The present study provides a new perspective in replanning with regard to these three aspects.

关键词： radiotherapy nasopharyngeal prescription

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