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Hyperbranched polyborosilazanes derived SiBCN ceramic for high-temperature wave-transparent performance 认领 引用 被引量：6
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作者 Zhen Yu Mingwei Ma +4 位作者 Ziyu Liu Zhengyi Zhang Chunjia Luo Tiantian Zhang Jie Kong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第29期162-170,共9页
Polymer-derived ceramics(PDCs)is a promising way to prepare ceramic-based electromagnetic functional materials,which can conveniently modulate the composition and dielectric properties of the ceramics.In this paper,Si... Polymer-derived ceramics(PDCs)is a promising way to prepare ceramic-based electromagnetic functional materials,which can conveniently modulate the composition and dielectric properties of the ceramics.In this paper,SiBCN ceramic matrix composites with excellent high-temperature wave-transparent performance were prepared through PDC method.Three hyperbranched polyborosilazanes(PBSZs)were prepared by adjusting the type of chlorosilane monomers containing different numbers of methyl groups.The carbon element of pyrolytic ceramics was tuned by adjusting the molecular structure of the precursor and the pyrolysis temperature.The lower the methyl number and pyrolysis temperature,the lower the dielectric constant of the polymer-derived SiBCN ceramics,which is favorable for electromagnetic wave(EMW)transmittance.The average EMW transmittance of SiBCN-C pyrolyzed from hyperbranched PBSZ using trichlorosilane at 1000℃ was 90.56%at room temperature.More excitingly,the excellent wave-transparent performance was also maintained in the temperature range of 100-800℃.At the test temperature of 800℃,SiBCN-C-1000 still had excellent wave-transparent performance with minimum and average EMW transmittance of 76.13%and 88.96%,respectively.This paper provided a new idea for the preparation of high-temperature wave-transparent SiBCN composite ceramics. 展开更多
关键词 Polymer-derived ceramic SiBCN Low carbon content High temperature wave-transparent materials
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ZnO/nitrogen-doped carbon nanocomplex with controlled morphology for highly efficient electromagnetic wave absorption 认领 引用 被引量：8
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作者 Zhen Yu Rui Zhou +4 位作者 Mingwei Ma Runqiu Zhu Peng Miao Pei Liu Jie Kong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第19期206-214,共9页
In this work,zeolitic imidazolate framework-8(ZIF-8)with yolk-shell and hollow structures were pre-pared by a convenient chemical etching method.A subsequent pyrolysis of ZIF-8 enabled one to pro-duce ZnOitrogen-doped... In this work,zeolitic imidazolate framework-8(ZIF-8)with yolk-shell and hollow structures were pre-pared by a convenient chemical etching method.A subsequent pyrolysis of ZIF-8 enabled one to pro-duce ZnOitrogen-doped carbon nanocomplexes with original ZIF-8 morphology,where hollow struc-ture showed superior electromagnetic wave absorption capacity and was responsible for matching the impedance of free space.The minimum reflection coefficients of hollow ZnOitrogen-doped carbon nanocomplexes were-51.2 dB(700℃)and-52.4 dB(800℃),respectively,whereas the effective ab-sorption band width was as large as 4 GHz and the content of pyrolyzed hollow ZIF-8 was 15 wt%,which was inferior to the level among similar electromagnetic wave(EMW)absorption materials.The conve-nient and facile strategy paves the way toward designing hierarchical structures for highly efficient and light-weight electromagnetic wave absorbers. 展开更多
关键词 Zeolitic imidazolate framework Electromagnetic wave absorption Yolk-shell structure Hollow structure Lightweight materials
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Magnetic-Field-Induced Spin Nematicity in FeSe1-xSxand FeSe1-yTeySuperconductor Systems 认领 引用 被引量：1
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作者 Shaobo Liu Jie Yuan +9 位作者 Sheng Ma Zouyouwei Lu Yuhang Zhang Mingwei Ma Hua Zhang Kui Jin Li Yu Fang Zhou Xiaoli Dong Zhongxian Zhao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2021年第8期102-109,共8页
The angular-dependent magnetoresistance(AMR)of the ab plane is measured on the single crystals of ironchalcogenide FeSe1-xSx(x=0,0.07,0.13 and 1)and FeSe1-yTey(y=0.06,0.61 and 1)at various temperatures und... The angular-dependent magnetoresistance(AMR)of the ab plane is measured on the single crystals of ironchalcogenide FeSe1-xSx(x=0,0.07,0.13 and 1)and FeSe1-yTey(y=0.06,0.61 and 1)at various temperatures under fields up to 9 T.A pronounced twofold-anisotropic carrier-scattering effect is identified by AMR,and attributed to a magnetic-field-induced spin nematicity that emerges from the tetragonal normal-state regime below a characteristic temperature Tsn.This magnetically polarized spin nematicity is found to be ubiquitous in the isoelectronic FeSe1-xSxand FeSe1-yTeysystems,no matter whether the sample shows an electronic nematic order at Ts≤Tsn,or an antiferromagnetic order at TN<Tsn,or neither order.Importantly,we find that the induced spin nematicity shows a very different response to sulfur substitution from the spontaneous electronic nematicity:The spin-nematic Tsnis not suppressed but even enhanced by the substitution,whereas the electronicnematic Tsis rapidly suppressed,in the FeSe1-xSxsystem.Furthermore,we find that the superconductivity is significantly suppressed with the enhancement of the induced spin nematicity in both FeSe1-xSxand FeSe1-yTeysamples. 展开更多
关键词 substitution attributed
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Fe1+yTexSe1-x:A Delicate and Tunable Majorana Material 认领 引用
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作者 杨发枝 Giao Ngoc Phan +10 位作者 张任杰 赵金 李佳俊 鲁邹有为 John Schneeloch 钟瑞丹 马明伟 顾根大 董晓莉 钱天 丁洪 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第1期48-52,共5页
We report the observation for the pz electron band and the band inversion in Fe1+yTexSe1-xwith angleresolved photoemission spectroscopy. Furthermore, we found that excess Fe(y>0) inhibits the topological band inver... We report the observation for the pz electron band and the band inversion in Fe1+yTexSe1-xwith angleresolved photoemission spectroscopy. Furthermore, we found that excess Fe(y>0) inhibits the topological band inversion in Fe1+yTexSe1-x,which explains the absence of Majorana zero modes in previous reports for Fe1+yTexSe1-xwith excess Fe. Based on our analysis of different amounts of Te doping and excess Fe, we propose a delicate topological phase in this material. Thanks to this delicate phase, one may be able to tune the topological transition via applying lattice strain or carrier doping. 展开更多
关键词 spectroscopy material topological
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Electronic Phase Separation in Iron Selenide(Li,Fe)OHFeSe Superconductor System 认领 引用 被引量：1
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作者 Yiyuan Mao Jun Li +14 位作者 Yulong Huan Jie Yuan Zi-an Li Ke Chai Mingwei Ma Shunli Ni Jinpeng Tian Shaobo Lin Huaxue Zhou Fang Zhoul, Jianqi Lil, Guangming Zhang Kui Jin Xiaoli Dong Zhongxian Zhao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2018年第5期123-128,共6页
The phenomenon of phase separation into antiferromagnetic（AFM） and superconducting（SC） or normal-state regions has great implication for the origin of high-temperature（high-T_c） superconductivity. However, the o... The phenomenon of phase separation into antiferromagnetic（AFM） and superconducting（SC） or normal-state regions has great implication for the origin of high-temperature（high-T_c） superconductivity. However, the occurrence of an intrinsic antiferromagnetism above the T_c of（Li,Fe）OHFe Se superconductor is questioned. Here we report a systematic study on a series of（Li,Fe）OHFe Se single crystal samples with T_c up to ～41 K. We observe an evident drop in the static magnetization at T_（afm） ～ 125 K, in some of the SC（T_c 38 K, cell parameter c■9.27 ？） and non-SC samples. We verify that this AFM signal is intrinsic to（Li,Fe）OHFe Se. Thus, our observations indicate mesoscopic-to-macroscopic coexistence of an AFM state with the normal（below T_（afm）） or SC（below T_c） state in（Li,Fe）OHFe Se. We explain such coexistence by electronic phase separation, similar to that in high-T_c cuprates and iron arsenides. However, such an AFM signal can be absent in some other samples of（Li,Fe）OHFe Se, particularly it is never observed in the SC samples of T_c 38 K, owing to a spatial scale of the phase separation too small for the macroscopic magnetic probe. For this case, we propose a microscopic electronic phase separation. The occurrence of two-dimensional AFM spin fluctuations below nearly the same temperature as T_（afm）, reported previously for a（Li,Fe）OHFe Se（T_c ～ 42 K） single crystal, suggests that the microscopic static phase separation reaches vanishing point in high T_c（Li,Fe）OHFe Se. A complete phase diagram is thus established. Our study provides key information of the underlying physics for high-T_c superconductivity. 展开更多
关键词 Li,Fe)OHFeSe Superconductor System Fe Electronic Phase Separation in Iron Selenide AFM
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Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals 认领 引用
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作者 Yiyuan Mao Zian Li +12 位作者 Huaxue Zhou Mingwei Ma Ke Chai Shunli Ni Shaobo Liu Jinpeng Tian Yulong Huang Jie Yuan Kui Jin Xiaoli Dong Fang Zhou Jianqi Li ZhongxianZhao 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期492-496,共5页
We synthesize a series of Mn substituted （Li, Fe）OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z （the atomic ratio of Mn：Se） ranging from 0 to 0.07. The distr... We synthesize a series of Mn substituted （Li, Fe）OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z （the atomic ratio of Mn：Se） ranging from 0 to 0.07. The distribution homogeneity of the Mn element incorporated into the lattice of （Li, Fe）OHFeSe is checked by combined measurements of high-angle- annular-dark-field （HAADF） imaging and electron energy-loss spectroscopy （EELS）. Interestingly, we find that the superconducting transition temperature Tc and unit cell parameter c of the Mn-doped （Li, Fe）OHFeSe samples display similar V-shaped evolutions with the increasing dopant concentration z. We propose that, with increasing doping level, the Mn dopant first occupies the tetrahedral sites in the （Li, Fe）OH layers before starting to substitute the Fe element in the su- perconducting FeSe layers, which accounts for the V-shaped change in cell parameter c. The observed positive correlation between the Tc and lattice parameter c, regardless of the Mn doping level z, indicates that a larger interlayer separation, or a weaker interlayer coupling, is essential for the high-Tc superconductivity in （Li, Fe）OHFeSe. This agrees with our previous observations on powder, single crystal, and film samples of （Li, Fe）OHFeSe superconductors. 展开更多
关键词 FeSe-based superconductors Mn doping effect correlation between superconductivity and interlayer separation
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Protonation induced high-T_c phases in iron-based superconductors evidenced by NMR and magnetization measurements 认领 引用 被引量：11
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作者 Yi Cui Gehui Zhang +14 位作者 Haobo Li Hai Lin Xiyu Zhu Hai-Hu Wen Guoqing Wang Jinzhao Sun Mingwei Ma Yuan Li Dongliang Gong Tao Xie Yanhong Gu Shiliang Lie Huiqian Luo Pu Yu Weiqiang Yu 《Science Bulletin》 SCIE EI CAS CSCD 2018年第1期11-16,共6页
Chemical substitution during growth is a well-established method to manipulate electronic states of quantum materials, and leads to rich spectra of phase diagrams in cuprate and iron-based superconductors. Here we rep... Chemical substitution during growth is a well-established method to manipulate electronic states of quantum materials, and leads to rich spectra of phase diagrams in cuprate and iron-based superconductors. Here we report a novel and generic strategy to achieve nonvolatile electron doping in series of(i.e.11 and 122 structures) Fe-based superconductors by ionic liquid gating induced protonation at room temperature. Accumulation of protons in bulk compounds induces superconductivity in the parent compounds, and enhances the Tclargely in some superconducting ones. Furthermore, the existence of proton in the lattice enables the first proton nuclear magnetic resonance(NMR) study to probe directly superconductivity. Using Fe S as a model system, our NMR study reveals an emergent high-Tcphase with no coherence peak which is hard to measure by NMR with other isotopes. This novel electric-fieldinduced proton evolution opens up an avenue for manipulation of competing electronic states(e.g.Mott insulators), and may provide an innovative way for a broad perspective of NMR measurements with greatly enhanced detecting resolution. 展开更多
关键词 Ion liquid gating Protonation NMR Iron-based superconductors
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Neoadjuvent androgen deprivation for seminal vesicle reduction:The optimal portion of seminal vesicle included in the high-dose CTV in localized prostate cancer radiotherapy 认领 引用
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作者 Xin Qi Xianshu Gao +7 位作者 Xiaomei Li Shangbin Qin Xiaoying Li Mingwei Ma Yun Bai Jiayan Chen Xueying Ren Hongzhen Li 《Radiation Medicine and Protection》 CSCD 2023年第1期43-47,共5页
Objective:To clarify the length and volume reduction of seminal vesicles(SVs)after neo-adjuvant hormonal therapy(NHT),in order to help contour the optimal SV included into high-dose clinical target volume(CTV)for radi... Objective:To clarify the length and volume reduction of seminal vesicles(SVs)after neo-adjuvant hormonal therapy(NHT),in order to help contour the optimal SV included into high-dose clinical target volume(CTV)for radiotherapy in intermediate-and high-risk patients.Methods:MR images both before and after NHT(5.3±2.2 months)were collected from thirty-one patients with cT2-4N0M0 prostate cancer.SV volume was measured in axial T1WI,while SV length was obtained in a reconstructed oblique coronary plane through its long axial from a 3D sequence.Results:SVs showed evident reduction both in length and volume(length:median 12.1%,range 4.0%–28.0%;volume:median 39.9%,range 9.4%–66.2%).For SVs with and without MR detected involvement,length shortening were(16.7±4.8)%and(11.1±4.4)%(P<0.001);for involved SVs and lesions,volume reduction were(41.0±16.0)%and(66.3±14.4)%,respectively(P<0.001),both indicating a more sensitive response to NHT of the involved portion than normal SV.Conclusions:Both volume and length of the SV will be reduced after receiving NHT.Besides,the invaded segments shrink more than normal SV tissue,indicating that SV portion included within the CTV can be reduced. 展开更多
关键词 Prostate cancer Seminal vesicles Target volume delineation Neo-adjuvant hormonal therapy
A novel phage LTH02 for shiga toxin-producing Escherichia coli:Biological characteristics,whole genomic analysis,and preliminary application in food 认领 引用
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作者 Mingwei Ma Zhenhuan He +10 位作者 Xiaonan Yang Yinghao He Leiqian Huang Chang Liu Jing Mu Lei Lei Gonghe Li Wende Wu Min Zheng Mingxian Shi Jiafeng Ding 《Food Bioscience》 SCIE 2025年第9期1218-1230,共13页
Shiga toxin-producing E.coli(STEC)is a kind of crucial foodborne pathogen.At present,numerous studies have shown that phage can effectively eliminate foodborne pathogens as a novel antibacterial agent without affectin... Shiga toxin-producing E.coli(STEC)is a kind of crucial foodborne pathogen.At present,numerous studies have shown that phage can effectively eliminate foodborne pathogens as a novel antibacterial agent without affecting the nutrition and flavor of fresh food.This research aimed to investigate the biological characteristics and potential application in food products of a novel phage LTH02 for STEC.Host range determination based on single-layer plates,stability assay based on double-layer plates,lytic activity test,and whole genome analysis were utilized to evaluate the biological characteristics of phage LTH02.The results showed that phage LTH02 had a lysis rate of 85.00% and displayed stability across pH levels ranging from 5 to 7 and temperatures between 4℃ and 60℃.Besides,phage LTH02 inhibited STEC proliferation in a period of 30 h at an MOI of 102 and lacked antibiotic genes or virulence factors.The sterilization effect on the STEC-contaminated food was evaluated through bacterial counting.Phage LTH02 exhibited an effective elimination in the STEC-contaminated milk,raw beef,and lettuce at temperatures of 4℃ and 24℃.The effect of phage LTH02 on food quality was evaluated through the measurement of pH,lactose content,TVB-N content,color difference,and sensory score of food.The results showed that phage LTH02 prevented the reduction of food quality caused by STEC.In conclusion,the phage LTH02 may serve as a potential antibacterial agent for controlling STEC in the food industry to enhance food safety and quality. 展开更多
关键词 stechost range determination Lth eliminate foodborne pathogens biological characteristics Shiga toxin producing E coli novel phage food products foodborne pathogenat
Bulk superconductivity in one-step grown Fe(Te,Se)crystals free of interstitial iron by minor Mn doping 认领 引用 被引量：1
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作者 Yadong Gu Menghu Zhou +11 位作者 Mengdi Zhang Yanwei Wu Binbin Ruan Xingyuan Hou Fan Zhang Peijie Jiang Qingsong Yang Geng Li Mingwei Ma Genfu Chen Lei Shan Zhian Ren 《Science China Materials》 SCIE EI CAS CSCD 2022年第9期2472-2478,共7页
The iron-based nontoxic chalcogenide superconductor Fe(Te,Se)has great potential for high magnetic field applications while it lacks a reliable method to produce bulk superconductor so far.Here we report a one-step sy... The iron-based nontoxic chalcogenide superconductor Fe(Te,Se)has great potential for high magnetic field applications while it lacks a reliable method to produce bulk superconductor so far.Here we report a one-step synthesis method to grow high-quality Fe(Te,Se)single crystals free of interstitial iron atoms through minor Mn doping.Bulk superconductivity is revealed in the as-grown centimetersized crystals with the optimal doping level of 1% Fe atoms substituted by Mn,which is systematically demonstrated by sharp electrical resistivity and magnetic susceptibility transitions,and large specific heat jumps.Compared with the undoped sample,the optimally doped one shows a significantly enhanced upper critical field,and a large self-field critical current density Jc of 4.5×105A cm-2 at 2 K(calculated by the Bean model),which maintains large values under high fields.The absence of interstitial iron atoms is testified by the scanning tunneling microscopy,and the effect of Mn doping is discussed.Our results provide a practical method by minor Mn doping to directly synthesize high-performance Fe(Te,Se)bulks that allow for future high-field superconducting applications. 展开更多
关键词 iron chalcogenide Fe(Te,Se) critical current density Mn doping
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短剧式分线剧情在高职《财务管理》课程思政中的融合路径与实践探究 认领 引用
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作者 马铭蔚 肖芳 《中国科学与技术学报》 2025年第3期180-184,共5页
随着新媒体技术的发展,短剧以其强烈的戏剧冲突、紧凑的叙事节奏和沉浸式的体验感,深受高职学生喜爱。本研究针对高职《财务管理》课程思政教学中存在的“硬融入”等问题,创新性地提出将“短剧式分线剧情”教学模式应用于课堂。通过设... 随着新媒体技术的发展,短剧以其强烈的戏剧冲突、紧凑的叙事节奏和沉浸式的体验感,深受高职学生喜爱。本研究针对高职《财务管理》课程思政教学中存在的“硬融入”等问题,创新性地提出将“短剧式分线剧情”教学模式应用于课堂。通过设计基于真实财务情境的“道德困境”或“价值选择”剧情主线,并设置不同决策导向的分支剧情,引导学生在“观看-思考-选择-体验”的互动过程中,主动构建知识体系,深刻领悟诚信守法、社会责任、风险意识、家国情怀等思政元素。论文系统阐述了该模式的理论基础、设计原则、具体实践路径,并辅以教学案例进行说明,最后对其实施效果与挑战进行了反思,以期为高职财经类专业课程的思政教学改革提供新思路。 展开更多
关键词 短剧教学 分线剧情 课程思政 财务管理 高职教育
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巨块型NSCLC质子部分立体定向消融推量放疗的剂量学优势 认领 引用 被引量：1
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作者 白赟 高献书 +15 位作者 马茗微 赵智磊 刘沛霖 曹汐 秦尚彬 刘思伟 高研 任雪盈 李洪振 张敏 李晓梅 吕峰 李晓颖 亓昕 陈佳琰 谢木 《中华放射肿瘤学杂志》 CSCD 北大核心 2022年第8期710-715,共6页
目的探索肿瘤长径>8 cm的巨块非小细胞肺癌(NSCLC)放疗中质子部分立体定向消融推量放疗(P-SABR)的剂量学优势。方法收集既往应用光子P-SABR治疗的9例巨块NSCLC的定位影像。在光子肿瘤推量靶区(光子GTVb)基础上逐步外扩,直到重要危及... 目的探索肿瘤长径>8 cm的巨块非小细胞肺癌(NSCLC)放疗中质子部分立体定向消融推量放疗(P-SABR)的剂量学优势。方法收集既往应用光子P-SABR治疗的9例巨块NSCLC的定位影像。在光子肿瘤推量靶区(光子GTVb)基础上逐步外扩,直到重要危及器官受量达3.0 Gy/次时停止,形成质子肿瘤推量靶区(质子GTVb),质子GTV、CTV范围同光子,分别制订光子固定野调强放疗(光子FF-IMRT)、光子容积调强弧形治疗(光子VMAT)、质子调强放疗(IMPT)计划。对比不同治疗技术的剂量学参数。结果光子GTVb和质子GTVb占GTV体积比分别为25.4%±13.4%和69.7%±30.0%(P<0.001)。光子IMRT、光子VMAT、IMPT的CTV平均剂量分别为(76.1±4.9)Gy、(78.2±3.6)Gy、(84.7±4.9)Gy,生物有效剂量(BED)≥90 Gy所包含肿瘤占GTV体积的百分比分别为70.7%±21.7%、76.8%±22.1%、97.9%±4.0%,质子较光子P-SABR计划显著提高了靶区剂量及BED(P<0.05)。质子较光子计划还降低了危及器官受量,其中光子FF-IMRT、光子VMAT和IMPT的双肺V5 Gy分别为49.2%±22.0%、56.8%±19.0%和16.1%±6.3%(P<0.001)。结论质子P-SABR较光子可在降低危及器官受量情况下,扩大肿瘤推量靶区范围并提高肿瘤内BED,有望进一步提高巨块NSCLC的局部控制率。 展开更多
关键词 放射疗法,质子 立体定向消融放射疗法 癌,非小细胞肺 巨块肿瘤
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