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Growth mechanisms of interfacial carbides in solid-state reaction between single-crystal diamond and chromium

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Journal of Materials Science & Technology 2023年第13期144卷 138-149页

作者： zhuo liu Wei Cheng Dekui Mu Qiaoli Lin Xipeng Xu Han Huang Institute of Manufacturing Engineering Huaqiao UniversityXiamen 361021China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730000China School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia

Interfacial bonding is one of the most challenging issues in the fabrication,and hence comprehensively influences the properties of diamond-based metal matrix composites(MMCs)*** this work,solid-state(S/S)interface reaction between single-crystal synthetic diamond and chromium(Cr)metal was critically examined with special attention given to unveil the role of crystal orientation in the for-mation and growth of interfacial *** has been revealed that catalytically converted carbon(CCC)was formed prior to chromium carbides,which is counterintuitive to previous *** 7 C 3 was the first carbide formed in the S/S interface reaction,aided by the relaxation of diamond lattices that re-duces the interfacial *** Cr 7 C 3 and Cr 3 C 2 carbides were formed at 600 and 800℃,respectively,with the growth preferred on diamond(100)plane,because of its higher density of surface defects than(111)*** strain distribution was quasi-quantitively measured using windowed Fourier Transform-Geometric Phase Analysis(WFT-GPA)analysis and an ameliorated strain concentration was found after the ripening of interfacial *** morphologies of Cr_(3)C_(2) grown on diamond(100)and(111)planes were perceived after S/S interface reaction at 1000℃,which is reported for the first *** underlying mechanisms of Cr-induced phase transformation on diamond surface,as well as the crystal orientation dependent growth of interfacial carbides were unveiled using the first-principles *** formation and growth mechanisms of Cr_(3)C_(2) were elucidated using SEM,TEM and XRD ***,an approach for tailoring the interfacial microstructure between synthetic diamond and bonding metals was proposed.

关键词： Solid-state Interface reaction Synthetic diamond Phase transformation Chromium carbide

Envafolimab combined with chemotherapy in the treatment of combined small cell lung cancer: A case report

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World Journal of Clinical Cases 2023年第5期11卷 1115-1121页

作者： Mei-Hong liu Yan-Xia Li zhuo liu Department of Pulmonary and Critical Care Medicine First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Combined small cell lung cancer(C-SCLC) is a special subtype of small cell lung cancer that is relatively rare, aggressive, and prone to early metastasis and has a poor prognosis. Currently, there are limited studies on C-SCLC, and there is no uniform standard treatment, especially for extensive C-SCLC, which still faces great challenges. In recent years, the development and progress of immunotherapy have provided more possibilities for the treatment of C-SCLC. We used immunotherapy combined with first-line chemotherapy to treat extensive-stage C-SCLC to explore its antitumor activity and *** SUMMARY We report a case of C-SCLC that presented early with adrenal, rib, and mediastinal lymph node metastases. The patient received carboplatin and etoposide with concurrent initiation of envafolimab. After 6 cycles of chemotherapy, the lung lesion was significantly reduced, and the comprehensive efficacy evaluation showed a partial response. No serious drug-related adverse events occurred during the treatment, and the drug regimen was well *** Envafolimab combined with carboplatin and etoposide in the treatment of extensive-stage C-SCLC has preliminary antitumor activity and good safety and tolerability.

关键词： Combined small cell lung cancer Envafolimab Carboplatin Etoposide Prognosis Case report

Lanthanide-doped nanocrystals in high-Q microtoroids for stable on-chip white-light lasers

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Photonics Research 2022年第7期10卷 1594-1601页

作者： LIMIN JIN zhuo liu YUQI ZHANG YUNKAI WU YILIN liu HUACHUN DENG QINGHAI SONG SHUMIN XIAO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Pengcheng Laboratory Shenzhen 518055China

The plentiful energy states of lanthanide(Ln^(3+))-doped nanomaterials make them very promising for on-chip integrated white-light *** the rapid progresses,the Ln^(3+)-based white upconversion emissions are strongly restricted by their low upconversion quantum efficiency and the color ***,we combine the CaF_(2):Yb_(35)Tm_(1.5)Er_(0.5)nanocrystals and the high-Q microtoroids,and experimentally demonstrate the chip-integrated stable white-light *** optimizing the sizes,density,and distributions of Ln^(3+)-doped nanocrystals,the Q factors of Ln^(3+)-doped microtoroids are maintained as high as 5×10^(5).The strong light matter interaction in high-Q microtoroids greatly enhances the upconversion emission and dramatically reduces the laser thresholds at 652 nm,545 nm,and 475 nm to similarly low values(1.89-2.10 m J cm^(-2)).Consequently,robust white-light microlaser has been experimentally achieved from a single *** research has paved a solid step toward the chip-scale integrated broadband microlasers.

关键词： stability light Lanthanide

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生态湿地蓄洪区水土保持方案探讨

黑龙江水利科技 2024年第08期52卷 35-38+89页

作者：姚天启刘卓玛姐邵永昌安徽省水利水电勘测设计研究总院股份有限公司

文章以巢湖十八联圩生态湿地蓄洪区为研究对象，通过分析工程现状及主体设计内容，确定水保方案执行的水土流失防治标准，制定防治措施总体布局，全面界定主设中水保措施，并在方案中进行补充设计，同时对防治效果进行预测，使项目区水... 详细信息

文章以巢湖十八联圩生态湿地蓄洪区为研究对象，通过分析工程现状及主体设计内容，确定水保方案执行的水土流失防治标准，制定防治措施总体布局，全面界定主设中水保措施，并在方案中进行补充设计，同时对防治效果进行预测，使项目区水土流失得到有效治理，生态环境得到改善，以期为同类项目的水保方案设计带来一些参考。

关键词：生态湿地蓄洪区水保方案水保措施巢湖十八联圩

Construction and application of bionic antifouling coatings inspired by soft coral

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Biosurface and Biotribology 2022年第3期8卷 244-253页

作者： Wei Bing EJin Limei Tian Huichao Jin zhuo liu Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchunChina School of Chemistry and Life Science Changchun University of TechnologyChangchunChina College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhouChina Weihai Institute for Bionics‐Jilin University WeihaiChina Department of the Lymphatic and Vascular Surgery Key Laboratory of Lymphatic Surgery Jilin ProvinceChina‐Japan Union Hospital of Jilin UniversityChangchunChina

Marine biofouling will bring a series of environmental and social problems,which restrict the development and utilisation of marine ***,how to prevent biofouling has become a global *** the exploration of antifouling methods,bionic antifouling technology with environmentally friendly,broad‐spectrum,and long‐term advantages has gradually attracted people's *** by the antifouling strategy of soft coral(Sarcophyton trocheliophorum),the silicone rubber(RTV‐2)with similar elasticity to coral skin was selected as the *** composite structure of the upper transparent layer and the lower porous layer was prepared by simulating the structure of soft coral as the structural factors of the bionic antifouling ***,several organic antifouling components with high content contained in soft coral were added to the transparent layer and porous layer,respectively,as the component factors of biomimetic *** bionic antifouling coatings,which are highly consistent with the coral structure,obtained the best antifouling performance under static and dynamic *** above results provide new ideas for the synthesis of environmentally friendly bionic antifouling coatings.

关键词： antifouling bacteria bionics soft coral silicon rubber

认同、同化、排异——《反美阴谋》中的美国梦文化记忆与国民身份形塑

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外语教育研究 2024年第2期12卷 58-64页

作者：刘卓范依烨孙郑一夫东北大学外国语学院沈阳110819

菲利普·罗斯在《反美阴谋》中以儿童菲利普的视角追忆了一段纳粹美国的虚构历史,揭示了美国梦作为盎格鲁-撒克逊中心主义的文化记忆对国民身份的多重形塑作用。美国梦不仅是美国犹太人建立美利坚民族身份认同的记忆支点,而且是反犹政... 详细信息

菲利普·罗斯在《反美阴谋》中以儿童菲利普的视角追忆了一段纳粹美国的虚构历史,揭示了美国梦作为盎格鲁-撒克逊中心主义的文化记忆对国民身份的多重形塑作用。美国梦不仅是美国犹太人建立美利坚民族身份认同的记忆支点,而且是反犹政府推行强制同化的手段。在WASP主流文化的倾轧之下,美国犹太人在美国性与犹太性之间痛苦挣扎,其中拒绝美国化的犹太人成为美国官方和犹太族群离弃的“残体”。通过揭露美国梦文化记忆的霸权本质,罗斯暗示了同化政策与德国纳粹的暧昧同谋,批判了等级森严的群体国民身份机制给犹太人造成的无法磨灭的创伤。

关键词：《反美阴谋》美国梦文化记忆国民身份 WASP 残体

纳米Ce_(1-4x)(FeAlCoLa)_(x)O_(2-δ)固溶体微观光谱特征及氧化还原性能研究

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光谱学与光谱分析 2024年第7期44卷 1883-1888页

作者：孙世龙张国芳束俊郭瑞华李一鸣刘卓承许剑轶葛启录内蒙古科技大学材料与冶金学院内蒙古包头014010 钢铁研究总院功能材料所北京100081

采用水热法合成Fe^(3+)、Al^(3+)、Co^(2+)及La^(3+)共掺杂纳米Ce_(1-4x)(FeAlCoLa)_(x)O_(2-δ)(x=0.00~0.05)固溶体,利用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外吸收光谱(UV)、荧光光谱(PL)、拉曼光谱(Raman)以及与H2的程序升温还原反应(TPR)等方法对固溶体的微观结构、形貌、光谱特征和氧化还原活性进行系统表征及分析。XRD结果表明,Ce_(1-4x)(FeAlCoLa)_(x)O_(2-δ)固溶体均呈CeO_(2)立方萤石结构,当掺杂量增加到x=0.04时,在36.6°处出现了微弱的Co_(3)O_(4)杂相,可以确定掺杂离子在CeO_(2)晶格中的固溶度x<0.04。样品的(111)衍射峰位向高角度偏移,表明掺杂离子引起晶格发生畸变。TEM及SEM结果显示样品为球形纳米颗粒,掺杂离子引起晶面间距变小。紫外吸收光谱表明,与纯CeO_(2)相比,掺杂样品的吸收边逐渐红移,在560~780 nm范围观察到掺杂离子的紫外吸收峰。掺杂引起样品能隙降低,从2.84 eV(纯CeO_(2))逐渐降低至2.10 eV(x=0.05)。其原因可归结为掺杂离子在CeO_(2)的价带和导带之间形成新的杂质能级,允许电子从价带跃迁到较低的杂质能级上,继而降低了跃迁能隙。由于掺杂离子引起晶格内部发生畸变以及氧空位比例增大,阻碍了电子的高能跃迁,也可引起能隙减小。荧光光谱证明,掺杂样品的发射峰强度明显降低。Raman光谱表明,掺杂引起F_(2g)峰位发生偏移,峰强减小,峰宽变大。同时,对应于氧空位峰的相对强度逐渐提高。荧光光谱及Raman光谱均证明掺杂离子引起固溶体晶格畸变程度增加,氧空位浓度提高。H_(2)-TPR测试表明,掺杂可以有效降低CeO_(2)的氧化还原反应温度,提高氧化还原活性,当x=0.03的样品表面还原温度最低,还原峰的面积最大,即氧化还原反应活性最佳,表明样品的氧化还原性能与晶粒尺寸、晶格缺陷及氧空位浓度密切相关。通过以上研究证明,四种离子共掺杂CeO_(2)能够有效修饰微观晶体结构,在较低掺杂浓度下即可显著改善样品的催化活性。

关键词：纳米Ce_(1-4x)(FeAlCoLa)_(x)O_(2-δ)固溶体共掺杂氧空位氧化还原活性

共点多极化电磁法对复杂地形条件下隧道断层的识别

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勘察科学技术 2024年第1期 52-56页

作者：赵虎刘卓徐勇谭建秋张泉四川省公路规划勘察设计研究院有限公司成都市610041

该文介绍了采用一种新型大地电磁方法—多极化大地电磁法,对复杂地形条件下的隧道进行勘察。该方法采用空间共点多极化同频观测方法,有效压制了静态效应,提高了山区大地电磁的勘探效率,改善了探测断层的准确度。在西昌至香格里拉高速新... 详细信息

该文介绍了采用一种新型大地电磁方法—多极化大地电磁法,对复杂地形条件下的隧道进行勘察。该方法采用空间共点多极化同频观测方法,有效压制了静态效应,提高了山区大地电磁的勘探效率,改善了探测断层的准确度。在西昌至香格里拉高速新山隧道工程应用中,该方法对隧道多处断裂构造位置及地质特征反映准确快速,为后续隧道设计及地勘工作起到了较好的指导作用,表明多极化大地电磁法,在复杂地形条件下的隧道断层识别中,具有较好的效果。

关键词：多极化大地电磁法复杂地形隧道断层

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河湖长制背景下复苏河湖生态环境路径探析

中国水利 2024年第10期 42-46页

作者：王冠军刘卓戴向前庞靖鹏刘啸水利部发展研究中心北京100038 中国水利经济研究会北京100052

河湖长制是一项基于我国政治制度和国家治理结构而设计的重大制度创新,实施7年多来,取得了显著成效。复苏河湖生态环境是推动新阶段水利高质量发展的六条实施路径之一,不仅涉及工程技术问题,更重要的是面临着理念、制度和管理层面突破... 详细信息

河湖长制是一项基于我国政治制度和国家治理结构而设计的重大制度创新,实施7年多来,取得了显著成效。复苏河湖生态环境是推动新阶段水利高质量发展的六条实施路径之一,不仅涉及工程技术问题,更重要的是面临着理念、制度和管理层面突破创新的挑战。在分析河湖长制制度效能的基础上,从体制机制、保护治理和制度政策3个维度探讨了复苏河湖生态环境的路径选择问题。研究建议:以河湖长制为复苏河湖生态环境的有力手段和重要的体制机制保障,将河湖长制的制度优势转化为河湖治理效能,统筹各方力量共同推进河湖保护治理;以建设幸福河湖为目标,通过系统治理、综合治理、源头治理,推动复苏河湖生态环境各项任务落实;将健全复苏河湖生态环境的制度和标准体系作为复苏河湖生态环境的政策制度路径。

关键词：河湖长制制度效能复苏河湖生态环境路径选择幸福河湖