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基于CCL2-CCR2信号轴探索松萝酸对胃癌细胞恶性行为的影响
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作者 滕晓丽 时昭红 +4 位作者 孟庆彬 周晓黎 廖艳 万莹 杨健 《中国免疫学杂志》 CAS CSCD 北大核心 2024年第8期1665-1670,共6页
目的:探讨松萝酸(UA)调节CC趋化因子配体2-CCL2受体(CCR2)信号轴对胃癌细胞恶性行为的影响。方法:以生长良好的人胃癌细胞系SGC-7901细胞为研究对象,通过不同浓度的UA处理,设为UA低浓度(UA-L)组(62.5μmol/L UA)、UA中浓度(UA-M)组(125... 目的:探讨松萝酸(UA)调节CC趋化因子配体2-CCL2受体(CCR2)信号轴对胃癌细胞恶性行为的影响。方法:以生长良好的人胃癌细胞系SGC-7901细胞为研究对象,通过不同浓度的UA处理,设为UA低浓度(UA-L)组(62.5μmol/L UA)、UA中浓度(UA-M)组(125μmol/L UA)、UA高浓度(UA-H)组(250μmol/L UA);同时对细胞转染CCL2过表达载体(pc DNA3.1 CCL2)、空载体(pc DNA3.1)、沉默CCL2(si CCL2)及阴性对照(si control),并采用250μmol/L UA处理SGC-7901细胞,标记为UA-H+pc DNA3.1 CCL2组、UA-H+pc DNA3.1组、UA-H+si CCL2组、UA-H+si control组,另取未处理的SGC-7901细胞作为对照组。流式细胞术、MTT及qRT-PCR检测细胞凋亡、增殖及CCL2、CCR2 mRNA表达水平;Western blot检测PD-L1、凋亡蛋白(Bax)、增殖蛋白(CyclinD1、CCL2、CCR2)、免疫逃逸相关蛋白(B7H1)表达水平;与体外分离培养的CD8+T细胞共培养后,ELISA检测上清液中IL-4、IFN-γ、IL-10水平。将各组细胞与活化的外周血单个核细胞(PBMC)1∶1共培养72 h,比较各组胃癌细胞对T细胞介导的杀伤敏感性。结果:与对照组相比,UA-L组、UA-M组、UA-H组细胞增殖率、IL-10水平、CyclinD1、PD-L1、CCL2、CCR2、B7H1蛋白及mRNA表达、与活化的PBMC 1∶1共培养72 h后的细胞计数显著降低,细胞凋亡率、IL-4、IFN-γ水平、Bax蛋白表达显著升高(P<0.05);与UA-H+pc DNA3.1组相比,UA-H+pc DNA3.1 CCL2组细胞增殖率、IL-10水平、CyclinD1、PDL1、CCL2、CCR2蛋白及mRNA表达、与活化的PBMC 1∶1共培养72 h后的细胞计数显著增加,细胞凋亡率、IL-4、IFN-γ水平、Bax蛋白表达显著降低(P<0.05);与UA-H+si control组相比,UA-H+si CCL2组细胞增殖率、IL-10水平、CyclinD1、PD-L1、CCL2、CCR2蛋白及mRNA表达、与活化的PBMC 1∶1共培养72 h后的细胞计数显著降低,细胞凋亡率、IL-4、IFN-γ水平、Bax蛋白表达显著升高(P<0.05)。结论:UA可抑制胃癌细胞增殖、免疫逃逸,诱导其凋亡,可能与抑制CCL2-CCR2信号轴有关。 展开更多
关键词 松萝酸 ccl2-CCR2信号轴 胃癌细胞 增殖 凋亡 免疫逃逸
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IL-21和CCL19修饰可提高NKP30 CAR-T细胞对肺癌的杀伤效率并促进其肿瘤浸润
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作者 周智锋 柳硕岩 +7 位作者 李洁羽 陈明秋 林辉 陈宇杰 陈伟杰 林军鹏 周航 郑庆丰 《南方医科大学学报》 CAS CSCD 北大核心 2024年第10期1926-1936,共11页
目的探讨细胞因子IL-21和趋化因子CCL19修饰的NKP30 CAR-T细胞是否增强对肺癌的杀伤和浸润作用。方法在NKP30 CAR基础上融合基因IL-21和CCL19构建IL-21-CCL19 NKP30 CAR;CAR-T细胞的培养使用CD3CD28单抗及细胞因子IL-2刺激;流式细胞术... 目的探讨细胞因子IL-21和趋化因子CCL19修饰的NKP30 CAR-T细胞是否增强对肺癌的杀伤和浸润作用。方法在NKP30 CAR基础上融合基因IL-21和CCL19构建IL-21-CCL19 NKP30 CAR;CAR-T细胞的培养使用CD3CD28单抗及细胞因子IL-2刺激;流式细胞术检测免疫细胞表型;迁移实验检测IL-21对免疫细胞的迁移作用;乳酸脱氢酶(LDH)及成球实验检测CAR-T细胞的杀伤及浸润能力;酶联免疫斑点技术(ELISPOT)检测IFN-γ的分泌数量;ELISA检测IL-21及CCL19的分泌情况;体内实验中,将肿瘤细胞显微注射到斑马鱼卵黄囊,构建斑马鱼移植瘤模型,24 h后将免疫细胞注射至同样部位,体式荧光显微镜拍摄荧光。结果NKP30配体(B7H6)在正常组织及血液细胞不表达,在肺癌细胞上高表达(90%以上)。IL-21-CCL19 NKP30 CAR-T细胞与NKP30 CAR-T细胞和常规T细胞相比,具有更强的增殖能力、迁移能力及中心记忆T细胞的形成(P<0.001),免疫抑制分子CTLA4与PD1显著降低(P<0.005),对肺癌细胞具有更强的杀伤能力(P<0.001),伴随IFN-γ数量明显增加(P<0.001)。IL-21-CCL19 CAR-T细胞杀伤肺癌细胞中产生大量细胞因子IL‑21(3152.33±526.74 pg/mL)和趋化因子CCL19(1853±211.95 pg/mL)。体内实验中,CAR-T细胞和普通T细胞比较,具有较强的杀伤能力和增殖能力,但2种CAR-T细胞无明显差异(P>0.05)。结论IL-21-CCL19 NKP30 CAR-T细胞更容易浸润到肿瘤内部,有效杀伤肿瘤细胞,同时产生更多的记忆T细胞。 展开更多
关键词 肺癌 NKP30 嵌合抗原受体基因修饰T淋巴细胞 IL-21 ccl19
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乌司他丁调节CCL2-CCR2信号轴对胃癌细胞上皮-间质转化和免疫逃逸的影响分析
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作者 王芳 胡洁琼 +1 位作者 冯彦虎 何东 《中国免疫学杂志》 CAS CSCD 北大核心 2024年第2期305-311,共7页
目的:探讨乌司他丁(UTI)调节CC趋化因子配体2(CCL2)-C-C趋化因子受体2(CCR2)信号轴对胃癌(GC)细胞上皮-间质转化(EMT)和免疫逃逸的影响。方法:qRT-PCR、Western blot分别检测GC组织/细胞中CCL2、CCR2 mRNA及蛋白表达水平;以不同浓度的UT... 目的:探讨乌司他丁(UTI)调节CC趋化因子配体2(CCL2)-C-C趋化因子受体2(CCR2)信号轴对胃癌(GC)细胞上皮-间质转化(EMT)和免疫逃逸的影响。方法:qRT-PCR、Western blot分别检测GC组织/细胞中CCL2、CCR2 mRNA及蛋白表达水平;以不同浓度的UTI(0、100、200、400、800 U/ml)干预细胞,MTT法检测细胞增殖情况;将AGS细胞分为control组、UTI组、pcDNA组、pcDNA-CCL2组,平板克隆和Transwell小室分别检测细胞增殖、迁移、侵袭。AGS细胞和CD8+T细胞共培养后,将CD8+T分为T细胞组、共培养组、UTI组、pcDNA组、pcDNA-CCL2组,流式细胞仪检测CD8+T细胞凋亡,ELISA检测CD8+T细胞上清中IFN-γ、IL-2、TNF-α水平;Western blot检测基质金属蛋白酶-2(MMP-2)、E-钙黏蛋白(E-cadherin)、波形蛋白(Vimentin)、程序性死亡配体1(PD-L1)及CCL2-CCR2信号通路蛋白表达。结果:在GC组织/细胞中,CCL2、CCR2蛋白及mRNA表达水平升高(P<0.05);UTI显著抑制AGS细胞的增殖、迁移、侵袭及EMT,降低AGS细胞中MMP-2、Vimentin、PD-L1、CCL2、CCR2蛋白表达,升高E-cadherin蛋白表达(P<0.05);过表达CCL2可逆转UTI对细胞增殖、迁移、侵袭及EMT的抑制作用;与T细胞组比较,共培养组CD8+T细胞IFN-γ、IL-2、TNF-α水平降低,细胞凋亡率升高(P<0.05);与共培养组比较,UTI组CD8+T细胞IFN-γ、IL-2、TNF-α水平升高,细胞凋亡率降低(P<0.05);与pcDNA组比较,pcDNA-CCL2组CD8+T细胞上述指标变化均显著逆转(P<0.05)。结论:UTI可能通过抑制CCL2-CCR2信号通路抑制AGS细胞的EMT和免疫逃逸。 展开更多
关键词 乌司他丁 ccl2-CCR2信号轴 胃癌 上皮间质转化 免疫逃逸
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CCL4在肿瘤微环境中影响免疫逃逸的研究进展
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作者 陈然 杨新月 +2 位作者 刘倩 张树才 马丽 《中国肺癌杂志》 CAS CSCD 北大核心 2024年第8期613-621,共9页
免疫治疗已成为当下恶性肿瘤治疗的基石。然而,不同患者对免疫治疗的反应具有较大异质性,并非都能从中获益。当下亟需寻找能高效预测免疫治疗疗效的生物标志物。C-C趋化因子配体4(C-C chemokine ligand4,CCL4)是一种细胞因子,隶属于炎症... 免疫治疗已成为当下恶性肿瘤治疗的基石。然而,不同患者对免疫治疗的反应具有较大异质性,并非都能从中获益。当下亟需寻找能高效预测免疫治疗疗效的生物标志物。C-C趋化因子配体4(C-C chemokine ligand4,CCL4)是一种细胞因子,隶属于炎症性CCL亚家族,主要由免疫细胞、肿瘤细胞分泌,在正常组织中不表达或者弱表达,在多种恶性肿瘤组织中异常高表达。CCL4与其受体C-C趋化因子受体5(C-C chemokine receptor type 5,CCR5)结合后可招募并介导免疫细胞迁移,破坏肿瘤微环境(tumor microenvironment,TME)的稳定性,参与致癌并促进肿瘤发展。在肿瘤免疫微环境中,CCL4可介导并募集单核细胞、巨噬细胞、自然杀伤(natural killer,NK)细胞、T细胞等关键免疫细胞定向迁移,成为影响免疫治疗疗效的潜在重要元素,而具有特定的价值。本文就CCL4在TME中影响免疫逃逸的研究进展进行综述,以期为基础研究及临床诊疗提供线索和参考。 展开更多
关键词 ccl4 免疫治疗 肿瘤微环境 免疫应答 免疫逃逸
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基于CCL2/CCR2信号轴的肿瘤免疫治疗药物的研究进展 被引量:3
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作者 崔珍珍 赵一凡 +3 位作者 孙玉 孟佳怡 康迪 胡立宏 《中国药科大学学报》 CAS CSCD 北大核心 2024年第1期36-44,共9页
趋化因子配体2(C-C motif chemokine ligand 2,CCL2)及其受体CCR2与肿瘤的发生、发展密切相关。CCL2/CCR2信号轴通过多种机制促进肿瘤进展,一方面CCL2与肿瘤细胞表面的CCR2结合促进肿瘤的生长/存活和转移;更为重要的是CCL2可以招募多种... 趋化因子配体2(C-C motif chemokine ligand 2,CCL2)及其受体CCR2与肿瘤的发生、发展密切相关。CCL2/CCR2信号轴通过多种机制促进肿瘤进展,一方面CCL2与肿瘤细胞表面的CCR2结合促进肿瘤的生长/存活和转移;更为重要的是CCL2可以招募多种免疫抑制细胞在肿瘤微环境中聚集,抑制免疫细胞的功能和活性,促进肿瘤进展。本文综述了CCL2/CCR2信号轴以及其在肿瘤及肿瘤微环境中的作用,并重点介绍了靶向CCL2/CCR2信号轴药物的临床研究进展,以期深入并全面了解CCL2/CCR2信号轴在肿瘤进展中的作用机制,开发更有效的肿瘤免疫治疗药物。 展开更多
关键词 ccl2 CCR2 肿瘤免疫治疗 肿瘤微环境 免疫抑制细胞
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High‑Entropy Layered Oxide Cathode Enabling High‑Rate for Solid‑State Sodium‑Ion Batteries 被引量:3
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作者 Tianxun Cai Mingzhi Cai +5 位作者 Jinxiao Mu Siwei Zhao Hui Bi Wei Zhao Wujie Dong Fuqiang Huang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第1期160-171,共12页
Na-ion O3-type layered oxides are prospective cathodes for Na-ion batteries due to high energy density and low-cost.Nevertheless,such cathodes usually suffer from phase transitions,sluggish kinetics and air instabilit... Na-ion O3-type layered oxides are prospective cathodes for Na-ion batteries due to high energy density and low-cost.Nevertheless,such cathodes usually suffer from phase transitions,sluggish kinetics and air instability,making it difficult to achieve high performance solid-state sodium-ion batteries.Herein,the high-entropy design and Li doping strategy alleviate lattice stress and enhance ionic conductivity,achieving high-rate performance,air stability and electrochemically thermal stability for Na_(0.95)Li_(0.06)Ni_(0.25)Cu_(0.05)Fe_(0.15)Mn_(0.49)O_(2).This cathode delivers a high reversible capacity(141 mAh g^(−1)at 0.2C),excellent rate capability(111 mAh g^(−1)at 8C,85 mAh g^(−1)even at 20C),and long-term stability(over 85%capacity retention after 1000 cycles),which is attributed to a rapid and reversible O3–P3 phase transition in regions of low voltage and suppresses phase transition.Moreover,the compound remains unchanged over seven days and keeps thermal stability until 279℃.Remarkably,the polymer solid-state sodium battery assembled by this cathode provides a capacity of 92 mAh g^(−1)at 5C and keeps retention of 96%after 400 cycles.This strategy inspires more rational designs and could be applied to a series of O3 cathodes to improve the performance of solid-state Na-ion batteries. 展开更多
关键词 High-entropy High-rate performance Li-TM interaction Air stability O3 layered oxide cathode
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Significantly Improved High-Temperature Energy Storage Performance of BOPP Films by Coating Nanoscale Inorganic Layer 被引量:2
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作者 Tiandong Zhang Hainan Yu +5 位作者 Young Hoon Jung Changhai Zhang Yu Feng Qingguo Chen Keon Jae Lee Qingguo Chi 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第2期30-38,共9页
Biaxially oriented polypropylene(BOPP)is one of the most commonly used commercial capacitor films,but its upper operating temperature is below 105℃due to the sharply increased electrical conduction loss at high tempe... Biaxially oriented polypropylene(BOPP)is one of the most commonly used commercial capacitor films,but its upper operating temperature is below 105℃due to the sharply increased electrical conduction loss at high temperature.In this study,growing an inorganic nanoscale coating layer onto the BOPP film's surface is proposed to suppress electrical conduction loss at high temperature,as well as increase its upper operating temperature.Four kinds of inorganic coating layers that have different energy band structure and dielectric property are grown onto the both surface of BOPP films,respectively.The effect of inorganic coating layer on the high-temperature energy storage performance has been systematically investigated.The favorable coating layer materials and appropriate thickness enable the BOPP films to have a significant improvement in high-temperature energy storage performance.Specifically,when the aluminum nitride(AIN)acts as a coating layer,the AIN-BOPP-AIN sandwich-structured films possess a discharged energy density of 1.5 J cm^(-3)with an efficiency of 90%at 125℃,accompanying an outstandingly cyclic property.Both the discharged energy density and operation temperature are significantly enhanced,indicating that this efficient and facile method provides an important reference to improve the high-temperature energy storage performance of polymer-based dielectric films. 展开更多
关键词 coating layer energy storage interfacial barrier polymer films
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Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion 被引量:2
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作者 Bangzhao Yin Jinge Liu +7 位作者 Bo Peng Mengran Zhou Bingchuan Liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian Yufeng Zheng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第4期1367-1385,共19页
Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical parts.Layer thickness(LT)is of great significance to the L-PBF process but has not... Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical parts.Layer thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg alloys.In this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were fabricated.The required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous scaffolds.Porosity tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy input.For thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the porosity.All the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy input.The increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain texture.With the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural change.The effect of layer thickness on the compressive properties of porous scaffolds was limited.However,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases. 展开更多
关键词 Magnesium alloy WE43 Laser powder bed fusion layer thickness Process optimization
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Investigation of anisotropic strength criteria for layered rock mass 被引量:1
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作者 Shuling Huang Jinxin Zhang +4 位作者 Xiuli Ding Chuanqing Zhang Gang Han Guoqi Yu Lulu Qu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第4期1289-1304,共16页
Layered rock mass is a type of engineering rock mass with sound mechanical anisotropy,which is generally unfavorable to the stability of underground works.To investigate the strength anisotropy of layered rock,the Moh... Layered rock mass is a type of engineering rock mass with sound mechanical anisotropy,which is generally unfavorable to the stability of underground works.To investigate the strength anisotropy of layered rock,the Mohr-Coulomb and Hoek-Brown criteria are introduced to establish the two transverse isotropic strength criteria based on Jaeger's single weak plane theory and maximum axial strain theory,and parameter determination methods.Furthermore,the sensitivity of strength parameters(K 1,K 2,and K 3)that are used to characterize the anisotropy strength of non-sliding failure involved in the strength criteria and confining pressure are investigated.The results demonstrate that strength parameters K 1 and K 2 affect the strength of layered rock samples at all bedding angles except for the bedding angle of 90°and the angle range that can cause the shear sliding failure along the bedding plane.The strength of samples at any bedding angle decreases with increasing K 1,whereas the opposite is for K 2.Except for bedding angles of 0°and 90°and the bedding angle range that can cause the shear sliding along the bedding plane,K 3 has an impact on the strength of rock samples with other bedding angles that the specimens'strength increases with increase of K 3.In addition,the strength of the rock sample increases as confining pressure rises.Furthermore,the uniaxial and triaxial tests of chlorite schist samples were carried out to verify and evaluate the strength criteria proposed in the paper.It shows that the predicted strength is in good agreement with the experimental results.To test the applicability of the strength criterion,the strength data of several types of rock in the literature are compared.Finally,a comparison is made between the fitting effects of the two strength criteria and other available criteria for layered rocks. 展开更多
关键词 layered rock Strength anisotropy Strength criterion Experimental verification
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超低介电损耗、超低CTE的高耐热CCL的开发
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作者 罗成 孟运东 +2 位作者 陈勇 张华 颜善银 《覆铜板资讯》 2024年第2期30-36,共7页
运用全碳氢结构树脂,通过配方设计,制备了具有超低低介损耗,超低CTE(X/Y/Z)、高耐热特性的高速覆铜板。测试了粘结片的固化反应性及流变特性,并对覆铜板的各项性能进行了测试。结果表明,所制备的覆铜板具有良好的综合性能,玻璃化温度Tg... 运用全碳氢结构树脂,通过配方设计,制备了具有超低低介损耗,超低CTE(X/Y/Z)、高耐热特性的高速覆铜板。测试了粘结片的固化反应性及流变特性,并对覆铜板的各项性能进行了测试。结果表明,所制备的覆铜板具有良好的综合性能,玻璃化温度Tg为252℃、10GHz频率下介电损耗角正切Df为0.00094、Z-CTE的50~260℃尺寸变化率为0.86%,Y-CTE为15ppm/℃,插损为-0.65dB/inch,能够满足单通道数据传输速率为112Gbps的材料需求。 展开更多
关键词 超低介电损耗 超低CTE 高耐热 ccl
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Variation in the permafrost active layer over the Tibetan Plateau during 1980–2020 被引量:1
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作者 Jinglong Huang Chaofan Li +2 位作者 Binghao Jia Chujie Gao Ruichao Li 《Atmospheric and Oceanic Science Letters》 CSCD 2024年第5期34-39,共6页
The active layer,acting as an intermediary of water and heat exchange between permafrost and atmosphere,greatly influences biogeochemical cycles in permafrost areas and is notably sensitive to climate fluctuations.Uti... The active layer,acting as an intermediary of water and heat exchange between permafrost and atmosphere,greatly influences biogeochemical cycles in permafrost areas and is notably sensitive to climate fluctuations.Utilizing the Chinese Meteorological Forcing Dataset to drive the Community Land Model,version 5.0,this study simulates the spatial and temporal characteristics of active layer thickness(ALT)on the Tibetan Plateau(TP)from 1980 to 2020.Results show that the ALT,primarily observed in the central and western parts of the TP where there are insufficient station observations,exhibits significant interdecadal changes after 2000.The average thickness on the TP decreases from 2.54 m during 1980–1999 to 2.28 m during 2000–2020.This change is mainly observed in the western permafrost region,displaying a sharp regional inconsistency compared to the eastern region.A persistent increasing trend of ALT is found in the eastern permafrost region,rather than an interdecadal change.The aforementioned changes in ALT are closely tied to the variations in the surrounding atmospheric environment,particularly air temperature.Additionally,the area of the active layer on the TP displays a profound interdecadal change around 2000,arising from the permafrost thawing and forming.It consistently decreases before 2000 but barely changes after 2000.The regional variation in the permafrost active layer over the TP revealed in this study indicates a complex response of the contemporary climate under global warming. 展开更多
关键词 Active layer thickness PERMAFROST Tibetan plateau Climatological characteristics
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Probabilistic analysis of tunnel face seismic stability in layered rock masses using Polynomial Chaos Kriging metamodel 被引量:2
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作者 Jianhong Man Tingting Zhang +1 位作者 Hongwei Huang Daniel Dias 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2678-2693,共16页
Face stability is an essential issue in tunnel design and construction.Layered rock masses are typical and ubiquitous;uncertainties in rock properties always exist.In view of this,a comprehensive method,which combines... Face stability is an essential issue in tunnel design and construction.Layered rock masses are typical and ubiquitous;uncertainties in rock properties always exist.In view of this,a comprehensive method,which combines the Upper bound Limit analysis of Tunnel face stability,the Polynomial Chaos Kriging,the Monte-Carlo Simulation and Analysis of Covariance method(ULT-PCK-MA),is proposed to investigate the seismic stability of tunnel faces.A two-dimensional analytical model of ULT is developed to evaluate the virtual support force based on the upper bound limit analysis.An efficient probabilistic analysis method PCK-MA based on the adaptive Polynomial Chaos Kriging metamodel is then implemented to investigate the parameter uncertainty effects.Ten input parameters,including geological strength indices,uniaxial compressive strengths and constants for three rock formations,and the horizontal seismic coefficients,are treated as random variables.The effects of these parameter uncertainties on the failure probability and sensitivity indices are discussed.In addition,the effects of weak layer position,the middle layer thickness and quality,the tunnel diameter,the parameters correlation,and the seismic loadings are investigated,respectively.The results show that the layer distributions significantly influence the tunnel face probabilistic stability,particularly when the weak rock is present in the bottom layer.The efficiency of the proposed ULT-PCK-MA is validated,which is expected to facilitate the engineering design and construction. 展开更多
关键词 Tunnel face stability layered rock masses Polynomial Chaos Kriging(PCK) Sensitivity index Seismic loadings
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Unique double-layer solid electrolyte interphase formed with fluorinated ether-based electrolytes for high-voltage lithium metal batteries 被引量:2
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作者 Ruo Wang Jiawei Li +11 位作者 Bing Han Qingrong Wang Ruohong Ke Tong Zhang Xiaohu Ao Guangzhao Zhang Zhongbo Liu Yunxian Qian Fangfang Pan Iseult Lynch Jun Wang Yonghong Deng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第1期532-542,I0012,共12页
Li metal batteries using high-voltage layered oxides cathodes are of particular interest due to their high energy density.However,they suffer from short lifespan and extreme safety concerns,which are attributed to the... Li metal batteries using high-voltage layered oxides cathodes are of particular interest due to their high energy density.However,they suffer from short lifespan and extreme safety concerns,which are attributed to the degradation of layered oxides and the decomposition of electrolyte at high voltage,as well as the high reactivity of metallic Li.The key is the development of stable electrolytes against both highvoltage cathodes and Li with the formation of robust interphase films on the surfaces.Herein,we report a highly fluorinated ether,1,1,1-trifluoro-2-[(2,2,2-trifluoroethoxy)methoxy]ethane(TTME),as a cosolvent,which not only functions as a diluent forming a localized high concentration electrolyte(LHCE),but also participates in the construction of the inner solvation structure.The TTME-based electrolyte is stable itself at high voltage and induces the formation of a unique double-layer solid electrolyte interphase(SEI)film,which is embodied as one layer rich in crystalline structural components for enhanced mechanical strength and another amorphous layer with a higher concentration of organic components for enhanced flexibility.The Li||Cu cells display a noticeably high Coulombic efficiency of 99.28%after 300 cycles and Li symmetric cells maintain stable cycling more than 3200 h at 0.5 mA/cm^(2) and 1.0m Ah/cm^(2).In addition,lithium metal cells using LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) and Li CoO_(2) cathodes(both loadings~3.0 m Ah/cm^(2))realize capacity retentions of>85%over 240 cycles with a charge cut-off voltage of 4.4 V and 90%for 170 cycles with a charge cut-off voltage of 4.5 V,respectively.This study offers a bifunctional ether-based electrolyte solvent beneficial for high-voltage Li metal batteries. 展开更多
关键词 Lithium metal batteries High-voltage layered oxides Fluorinated ether-based electrolytes Solid electrolyte interphase Cathode electrolyte interphase
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Multi-scale physics-informed neural networks for solving high Reynolds number boundary layer flows based on matched asymptotic expansions 被引量:1
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作者 Jianlin Huang Rundi Qiu +1 位作者 Jingzhu Wang Yiwei Wang 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2024年第2期76-81,共6页
Multi-scale system remains a classical scientific problem in fluid dynamics,biology,etc.In the present study,a scheme of multi-scale Physics-informed neural networks is proposed to solve the boundary layer flow at hig... Multi-scale system remains a classical scientific problem in fluid dynamics,biology,etc.In the present study,a scheme of multi-scale Physics-informed neural networks is proposed to solve the boundary layer flow at high Reynolds numbers without any data.The flow is divided into several regions with different scales based on Prandtl's boundary theory.Different regions are solved with governing equations in different scales.The method of matched asymptotic expansions is used to make the flow field continuously.A flow on a semi infinite flat plate at a high Reynolds number is considered a multi-scale problem because the boundary layer scale is much smaller than the outer flow scale.The results are compared with the reference numerical solutions,which show that the msPINNs can solve the multi-scale problem of the boundary layer in high Reynolds number flows.This scheme can be developed for more multi-scale problems in the future. 展开更多
关键词 Physics-informed neural networks(PINNs) MULTI-SCALE Fluid dynamics Boundary layer
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Physical Layer Encryption of OFDM-PON Based on Quantum Noise Stream Cipher with Polar Code 被引量:1
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作者 Xu Yinbo Gao Mingyi +3 位作者 Zhu Huaqing Chen Bowen Xiang Lian Shen Gangxiang 《China Communications》 SCIE CSCD 2024年第3期174-188,共15页
Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast e... Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast exposes the physical layer vulnerable to the threat of illegal eavesdropping. Quantum noise stream cipher(QNSC) is a classic physical layer encryption method and well compatible with the OFDM-PON. Meanwhile, it is indispensable to exploit forward error correction(FEC) to control errors in data transmission. However, when QNSC and FEC are jointly coded, the redundant information becomes heavier and thus the code rate of the transmitted signal will be largely reduced. In this work, we propose a physical layer encryption scheme based on polar-code-assisted QNSC. In order to improve the code rate and security of the transmitted signal, we exploit chaotic sequences to yield the redundant bits and utilize the redundant information of the polar code to generate the higher-order encrypted signal in the QNSC scheme with the operation of the interleaver.We experimentally demonstrate the encrypted 16/64-QAM, 16/256-QAM, 16/1024-QAM, 16/4096-QAM QNSC signals transmitted over 30-km standard single mode fiber. For the transmitted 16/4096-QAM QNSC signal, compared with the conventional QNSC method, the proposed method increases the code rate from 0.1 to 0.32 with enhanced security. 展开更多
关键词 physical layer encryption polar code quantum noise stream cipher
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Wedge-shaped HfO_(2) buffer layer-induced field-free spin-orbit torque switching of HfO_(2)/Pt/Co structure 被引量:1
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作者 陈建辉 梁梦凡 +4 位作者 宋衍 袁俊杰 张梦旸 骆泳铭 王宁宁 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期662-667,共6页
Field-free spin-orbit torque(SOT)switching of perpendicular magnetization is essential for future spintronic devices.This study demonstrates the field-free switching of perpendicular magnetization in an HfO_(2)/Pt/Co/... Field-free spin-orbit torque(SOT)switching of perpendicular magnetization is essential for future spintronic devices.This study demonstrates the field-free switching of perpendicular magnetization in an HfO_(2)/Pt/Co/TaO_(x) structure,which is facilitated by a wedge-shaped HfO_(2)buffer layer.The field-free switching ratio varies with HfO_(2)thickness,reaching optimal performance at 25 nm.This phenomenon is attributed to the lateral anisotropy gradient of the Co layer,which is induced by the wedge-shaped HfO_(2)buffer layer.The thickness gradient of HfO_(2)along the wedge creates a corresponding lateral anisotropy gradient in the Co layer,correlating with the switching ratio.These findings indicate that field-free SOT switching can be achieved through designing buffer layer,offering a novel approach to innovating spin-orbit device. 展开更多
关键词 spin-orbit torque field-free switching HfO_(2) buffer layer
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Difficulties, strategies, and recent research and development of layered sodium transition metal oxide cathode materials for high-energy sodium-ion batteries 被引量:1
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作者 Kouthaman Mathiyalagan Dongwoo Shin Young-Chul Lee 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第3期40-57,I0003,共19页
Energy-storage systems and their production have attracted significant interest for practical applications.Batteries are the foundation of sustainable energy sources for electric vehicles(EVs),portable electronic devi... Energy-storage systems and their production have attracted significant interest for practical applications.Batteries are the foundation of sustainable energy sources for electric vehicles(EVs),portable electronic devices(PEDs),etc.In recent decades,Lithium-ion batteries(LIBs) have been extensively utilized in largescale energy storage devices owing to their long cycle life and high energy density.However,the high cost and limited availability of Li are the two main obstacles for LIBs.In this regard,sodium-ion batteries(SIBs) are attractive alternatives to LIBs for large-scale energy storage systems because of the abundance and low cost of sodium materials.Cathode is one of the most important components in the battery,which limits cost and performance of a battery.Among the classified cathode structures,layered structure materials have attracted attention because of their high ionic conductivity,fast diffusion rate,and high specific capacity.Here,we present a comprehensive review of the classification of layered structures and the preparation of layered materials.Furthermore,the review article discusses extensively about the issues of the layered materials,namely(1) electrochemical degradation,(2) irreversible structural changes,and(3) structural instability,and also it provides strategies to overcome the issues such as elemental phase composition,a small amount of elemental doping,structural design,and surface alteration for emerging SIBs.In addition,the article discusses about the recent research development on layered unary,binary,ternary,quaternary,quinary,and senary-based O3-and P2-type cathode materials for high-energy SIBs.This review article provides useful information for the development of high-energy layered sodium transition metal oxide P2 and O3-cathode materials for practical SIBs. 展开更多
关键词 O3-type P2-type Cathode materials Sodium-ion batteries layered structure
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Dynamic response and failure process of horizontal-layered fractured structure rock slope under strong earthquake 被引量:1
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作者 WANG Tong LIU Xianfeng +5 位作者 HOU Zhaoxu XU Jiahang ZHANG Jun YUAN Shengyang JIANG Guanlu HU Jinshan 《Journal of Mountain Science》 SCIE CSCD 2024年第3期882-900,共19页
Rock slope with horizontal-layered fractured structure(HLFS)has high stability in its natural state.However,a strong earthquake can induce rock fissure expansion,ultimately leading to slope failure.In this study,the d... Rock slope with horizontal-layered fractured structure(HLFS)has high stability in its natural state.However,a strong earthquake can induce rock fissure expansion,ultimately leading to slope failure.In this study,the dynamic response,failure mode,and spectral characteristics of rock slope with HLFS under strong earthquake conditions were investigated based on the large-scale shaking table model test.On this basis,multiple sets of numerical calculation models were further established by UDEC discrete element program.Five influencing factors were considered in the parametric study of numerical simulations,including slope height,slope angle,bedding-plane spacing and secondary joint spacing as well as bedrock dip angle.The results showed that the failure process of rock slope with HLFS under earthquake action is mainly divided into four phases,i.e.,the tensile crack of the slope shoulder joints and shear dislocation at the top bedding plane,the extension of vertical joint cracks and increase of shear displacement,the formation of step-through sliding surfaces and the instability,and finally collapse of fractured rock mass.The acceleration response of slopes exhibits elevation amplification effect and surface effect.Numerical simulations indicate that the seismic stability of slopes with HLFS exhibits a negative correlation with slope height and angle,but a positive correlation with bedding-plane spacing,joint spacing,and bedrock dip angle.The results of this study can provide a reference for seismic stability evaluation of weathered rock slopes. 展开更多
关键词 Seismic behavior Horizontal layered Weathered rock slope Shaking table test Failure mode
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CCL11在大疱性类天疱疮中表达水平差异与中医证素相关性分析
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作者 原晋湘 王甜雪 +3 位作者 于研 李梦琳 郭涛 张峻岭 《皮肤科学通报》 2024年第3期318-322,共5页
目的通过检测大疱性类天疱疮(bullous pemphigoid,BP)患者皮损的嗜酸性粒细胞趋化因子11(CCL11)水平,探讨CCL11在BP不同中医证素间的水平差异,为BP的辨证分型及治疗提供有价值的分子靶标。方法纳入天津市中医药研究院附属医院2019年1月... 目的通过检测大疱性类天疱疮(bullous pemphigoid,BP)患者皮损的嗜酸性粒细胞趋化因子11(CCL11)水平,探讨CCL11在BP不同中医证素间的水平差异,为BP的辨证分型及治疗提供有价值的分子靶标。方法纳入天津市中医药研究院附属医院2019年1月—2021年1月共65例BP患者作为研究组及24例有美容需求的健康人群作为对照组,通过免疫组织化学对皮损组织中的CCL11进行染色,应用Image-pro Plus 6.0图像分析软件对阳性表达区域平均光密度值(average optical density,AOD)进行定量分析,应用SPSS26.0统计软件分析不同中医证素及健康对照组间CCL11的统计学差异。结果热毒证素、湿热证素、脾虚证素皮损的CCL11表达AOD值分别为0.34±0.12、0.29±0.13、0.25±0.12,较健康对照组0.09±0.09差异均有统计学意义(P<0.001),热毒证素与脾虚证素两组间差异有统计学意义(P=0.042),其余证素相互间差异无统计学意义。结论皮损中CCL11表达水平在不同中医证素中从高至低依次为热毒、湿热、脾虚,且热毒证素与脾虚证素的CCL11表达水平有统计学差异。 展开更多
关键词 大疱性类天疱疮 趋化因子 ccl11 证素 辨证论治
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牙龈卟啉单胞菌上调CCL20的表达对口腔鳞状细胞表型的影响
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作者 刘雪 许立明 +1 位作者 刘朗清 凌彬 《新疆医科大学学报》 CAS 2024年第3期322-328,共7页
目的 探讨牙龈卟啉单胞菌(Porphyromonas gingivalis,P.g)通过诱导CCL20的表达对人口腔鳞状细胞癌(Oral squamous cell carcinoma, OSCC)细胞增殖、迁移和侵袭的影响,进一步明确CCL20对口腔癌细胞表型的影响。方法 收集2021-2023年就诊... 目的 探讨牙龈卟啉单胞菌(Porphyromonas gingivalis,P.g)通过诱导CCL20的表达对人口腔鳞状细胞癌(Oral squamous cell carcinoma, OSCC)细胞增殖、迁移和侵袭的影响,进一步明确CCL20对口腔癌细胞表型的影响。方法 收集2021-2023年就诊于本院颌面肿瘤外科44例患者的临床资料、外周血和OSCC组织标本,另收集22例健康志愿者外周血作为对照组。通过免疫组化和ELISA检测人口腔鳞癌组织和血清中CCL20的表达。通过体外培养人口腔鳞状细胞癌CAL27和SCC25细胞,建立细胞细菌共培养模型,采用实时荧光定量聚合酶链式反应(qRT-PCR)和酶联免疫吸附实验(ELISA)检测CAL27、SCC25细胞和P.g组中CCL20表达情况;运用CCK-8、划痕和Transwell实验检测P.g和CCL20对各组细胞增殖、迁移和侵袭能力的影响。结果 人口腔鳞状细胞癌组织中CCL20的表达显著高于癌旁组织(P<0.05);与control组相比,感染P.g的CAL27和SCC25细胞中CCL20的mRNA和蛋白水平明显上调(P<0.05)。在P.g感染下,CAL27和SCC25细胞的增殖、迁移和侵袭能力均得到增强(P<0.05),而阻断CCL20表达后,P.g对口腔癌细胞的增殖、迁移和侵袭能力减弱(P<0.05)。结论 P.g通过上调CAL27和SCC25细胞中CCL20的表达来促进口腔鳞癌细胞的增殖、迁移和侵袭能力。 展开更多
关键词 肿瘤微环境 牙龈卟啉单胞菌 口腔鳞状细胞癌 ccl20 表型
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