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Two‑Dimensional Cr_(5)Te_(8)@Graphite Heterostructure for Efficient Electromagnetic Microwave Absorption

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Nano-Micro Letters 2024年第3期16卷 407-422页

作者： liyuan Qin Ziyang Guo Shuai Zhao Denan Kong Wei Jiang Ruibin liu Xijuan Lv Jiadong Zhou Qinghai Shu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081People’s Republic of China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081People’s Republic of China Tangshan Research Institute Beijing Institute of TechnologyTangshan 063099People’s Republic of China

Two-dimensional(2D)transition metal chalcogenides(TMCs)hold great promise as novel microwave absorption materials owing to their interlayer interactions and unique magnetoelectric ***,overcoming the impedance mismatch at the low loading is still a challenge for TMCs due to the restricted loss pathways caused by their high-density ***,an interface engineering based on the heterostructure of 2D Cr_(5)Te_(8) and graphite is in situ constructed via a one-step chemical vapor deposit to modulate impedance matching and introduce multiple attenuation ***,the Cr_(5)Te_(8)@EG(ECT)heterostructure exhibits a minimum reflection loss of up to−57.6 dB at 15.4 GHz with a thin thickness of only 1.4 mm under a low filling rate of 10%.The density functional theory calculations confirm that the splendid performance of ECT heterostructure primarily derives from charge redistribution at the abundant intimate interfaces,thereby reinforcing interfacial polarization ***,the ECT coating displays a remarkable radar cross section reduction of 31.9 dB m^(2),demonstrating a great radar microwave scattering *** work sheds light on the interfacial coupled stimulus response mechanism of TMC-based heterogeneous structures and provides a feasible strategy to manipulate high-quality TMCs for excellent microwave absorbers.

关键词： Chemical vapor deposition Interface polarization engineering Cr_(5)Te_(8)-graphite heterojunctions Microwave absorption

人白细胞介素-26慢病毒表达质粒与基因敲除质粒的构建及其在HEK293T细胞中的活性验证

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中国生物制品学杂志 2024年第2期37卷 151-159页

作者：周海金吴珊刘丽媛蒋丹许涛蓝华滔舒纬童徐广贤广东医科大学医学技术学院医学检验系广东东莞523000 宁夏医科大学临床医学院宁夏银川750004

目的构建人白细胞介素(interleukin,IL)-26慢病毒表达质粒与基因敲除质粒,为研究IL-26基因在细胞信号通路及细胞自噬中的功能奠定基础。方法利用RT-PCR从人外周血单个核细胞中扩增IL-26基因序列,克隆至pCDH-CMV-MCS-EF1-copGFP真核表... 详细信息

目的构建人白细胞介素(interleukin,IL)-26慢病毒表达质粒与基因敲除质粒,为研究IL-26基因在细胞信号通路及细胞自噬中的功能奠定基础。方法利用RT-PCR从人外周血单个核细胞中扩增IL-26基因序列,克隆至pCDH-CMV-MCS-EF1-copGFP真核表达载体中,构建过表达质粒;并根据IL-26外显子序列设计4个敲除靶点Exon1sgRNA1、Exon1sgRNA2、Exon3sgRNA1、Exon3sgRNA2,利用CRISPR/Cas9技术构建至lentiCRISPRv2载体中,构建基因敲除质粒。将过表达质粒和基因敲除质粒分别瞬时转染至HEK293T细胞,利用RT-qPCR和Western blot验证IL-26 mRNA和蛋白的表达情况。并对IL-26进行氨基酸序列分析、结构预测及亚细胞定位观察。结果通过酶切、测序鉴定及生物信息学分析显示,IL-26全长516 bp,编码171个氨基酸。IL-26过表达质粒转染的HEK293T细胞与正常对照组相比,IL-26 mRNA水平升高了656.789倍,蛋白质水平升高了1.978倍,差异均有统计学意义(t分别为17.976和7.859,P分别<0.000 1和<0.001)。4个敲除靶点Exon1sgRNA1、Exon1sgRNA2、Exon3sgRNA1、Exon3sgRNA2质粒转染至HEK293T细胞中后,IL-26的表达水平分别下降了0.930、0.980、0.523 3和0.316 9倍,其中Exon3-sgRNA2质粒能够显著下调IL-26的表达(t=7.440,P <0.001)。IL-26蛋白的前22个氨基酸存在信号肽结构,且具有一定的跨膜功能,IL-26存在于细胞质中。结论成功构建了IL-26过表达和基因敲除质粒,为后续IL-26功能的研究奠定了基础。

关键词：白细胞介素-26 过表达质粒基因敲除质粒生物信息学

Nanosize-effect on the distribution of heavy metals in copper smelting dust:Based on sophisticated dust sorting approach

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Nano Research 2024年第1期17卷 312-320页

作者： Ken Li Zuwu Liao Hengdi Ye Qingzhu Li Fenghua Shen Qian Li Hui liu Qingwei Wang Xu Yan Zhang Lin liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China National Engineering Research Center of Sintering and Pelletizing Equipment System Zhongye Changtian International Engineering Co.LtdChangsha 410205China

Dust particles emitted from smelters can be hazardous to ecosystems and humans,as they are often enriched in metallic ***,we combined multi-method mineralogical analysis with a sophisticated size sorting approach for copper smelting dust to study the nanosize-effect on heavy metal distribution,which has hitherto been *** types of dust were collected from a copper flash smelter and then size-sorted using a Dekati low-pressure *** showed that all three samples could easily sort out nanoscale dust particles(<1μm,grades 10–2)and even those smaller than 100 nm(grades 5–2).Especially for electrostatic precipitators dust,the mass fraction of nanoscale dust(<1μm)could reach 10.71%.The presence of heavy metals(Pb,Zn,Cu,and As)and their mineral species in dust was examined at various particle *** was discovered that different heavy metals are enriched on nanoparticles in specific *** micron-sized particles,heavy metals are generally found in discrete phases(e.g.,CuSO_(4),PbSO_(4),and As_(2)O_(3)).In nanoscale particles,the dominant phase is Fe_(3)O_(4),while heavy metals are mostly found in lattice substitution(e.g.,CuFe_(2)O_(4)and ZnFe_(2)O_(4)).Two distinct nano-dust morphologies were found:One with irregular mesh or chain structures consisting of particles of a few nanometers,and the other with polygonal crystals in larger sizes of hundreds of *** enrichment of heavy metals in the latter morphology is more pronounced,possibly because lattice substitution of heavy metals is more likely to occur when polycrystalline particles are formed.

关键词： copper flue dust size-sorted heavy metal distribution morphology nano-sized effects

Recombinant adeno-associated virus 8 vector in gene therapy:Opportunities and challenges

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Genes & Diseases 2024年第1期11卷 283-293页

作者： liyuan Zhao Zixuan Yang Minhui Zheng Lei Shi Mengyun Gu Gang liu Feng Miao Yan Chang Fanghua Huang Naping Tang Anhui University of Traditional Chinese Medicine HefeiAnhui 230000China Yangtze Delta Drug Advanced Research Institute Yangtze Delta Pharmaceutical CollegeNantongJiangsu226133China Shanghai Innostar Bio-Technology Co. LtdChina State Institute of Pharmaceutical IndustryShanghai 201203China Innostar Bio-tech Nantong Co. Ltd.NantongJiangsu 226133China Center for Drug Evaluation National Medical Products AdministrationBeijing 100022China

In recent years,significant breakthroughs have been made in the field of gene ***-associated virus(AAV)is one of the most promising gene therapy vectors and a powerful tool for delivering the gene of *** the AAV vectors,AAV serotype 8(AAv8)has attracted much attention for its efficient and stable gene transfection into specific ***,recombinant AAv8 has been widely used in gene therapy research on a va-riety of diseases,including genetic diseases,cancers,autoimmune diseases,and viral diseases.

关键词： AAV8 Adeno-associated virus Gene therapy Primates

火箭贮箱侧壁法兰结构TIG焊接变形仿真与顺序优化

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焊接 2024年第1期 21-26页

作者：尹宣赵艳秋王建峰王磊磊刘力源鄢东洋占小红南京航空航天大学南京211106 中国运载火箭技术研究院北京100071

文中针对火箭贮箱侧壁法兰结构TIG焊接的变形情况开展有限元分析,建立2A14铝合金贮箱侧壁法兰结构TIG焊接有限元模型,采用双椭球模型模拟马鞍形焊缝的焊接热输入情况,并根据焊接过程温度检测结果及焊缝宏观形貌校核热源模型,重点探究焊... 详细信息

文中针对火箭贮箱侧壁法兰结构TIG焊接的变形情况开展有限元分析,建立2A14铝合金贮箱侧壁法兰结构TIG焊接有限元模型,采用双椭球模型模拟马鞍形焊缝的焊接热输入情况,并根据焊接过程温度检测结果及焊缝宏观形貌校核热源模型,重点探究焊接起始位置、焊接顺序对关键部位(焊缝、密封槽)焊接变形的影响。模拟结果表明,焊后变形主要集中在焊缝区域,密封槽变形较小;焊缝与密封槽的焊接变形分布趋势相近,均在B(B')点出现变形峰值。此外,与改变焊接起点相比,改变焊接顺序对焊接变形的影响更为显著。贮箱侧壁法兰结构焊接顺序优化结果显示,在盖面反向焊(方案四)下,焊接变形分布较为均匀,焊缝和密封槽焊接变形最小。在这种情况下,焊缝最大变形量为1.022 mm,密封槽最大变形量为0.505 mm。

关键词：焊接变形数值模拟焊接顺序 TIG焊马鞍形焊缝

China’s synergy in the implementation of international conventions on chemicals and waste

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Emerging Contaminants 2021年第1期7卷 132-138页

作者： liyuan liu Guanglong Wu Yong Ren Yang Chen Qinzhong Feng College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China Foreign Environmental Cooperation Center Ministry of Ecology and Environment of People’s Republic of ChinaBeijing100035China

The international environmental conventions have become the main effective ways to solve the global environmental issues,which are also the most active convention mechanisms in the *** paper studies development trend and the implementation of the international environmental conventions on chemicals and wastes in China,such as Basel Convention,Rotterdam Convention,Stockholm Convention and Minamata *** on the Multilateral Synergy of International Conventions on Chemicals and Wastes,gaps and needs of the management of chemicals and wastes in China,this article put forward proposals for China to implement the coordinated development of these four conventions in the future..

关键词： Chemicals and wastes International conventions Multilateral synergy

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燃煤烟气脱汞金属氧化物材料研究现状与进展

环境保护科学 2024年第5期50卷 49-57页

作者：杨世童冯钦忠刘俐媛王凯月陈俊王通哲郭剑波陈扬中国科学院大学北京100049 国家环境保护汞污染防治工程技术中心北京100049 重庆科技学院重庆401331

燃煤烟气中单质汞极难溶于水,并且具有很高的挥发性,利用现有装置难以对其进行脱除,这也是造成环境污染的主要因素,因此控制烟气中单质汞的排放成为当前人们研究的重点。金属氧化物吸附法是目前控制燃煤烟气单质汞排放研究中较多的一种... 详细信息

燃煤烟气中单质汞极难溶于水,并且具有很高的挥发性,利用现有装置难以对其进行脱除,这也是造成环境污染的主要因素,因此控制烟气中单质汞的排放成为当前人们研究的重点。金属氧化物吸附法是目前控制燃煤烟气单质汞排放研究中较多的一种方法,能够开发出成本低、高效清洁的吸附剂是研究热点。文章综述了金属氧化物脱汞吸附剂研究现状与进展,综合叙述了目前常见金属氧化物脱汞吸附剂的类型及其作用机制,整理了金属氧化物吸附剂的传统制备方法与创新方法,提出了制备金属氧化物脱汞吸附剂的吸附性能指标并进行统计对比,分析了金属氧化物脱汞吸附剂在燃煤烟气中的应用条件,对金属氧化物吸附剂的研究做了总结、建议及展望,为烟气中单质汞的污染控制提供新的思路和方法。

关键词：燃煤烟气金属氧化物吸附剂脱汞研究进展

Molecularly Imprinted Micro-Solid-Phase Extraction for the Selective Determination of Phenolic Compounds in Environmental Water Samples with High Performance Liquid Chromatraphy

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Open Journal of Polymer Chemistry 2013年第3期3卷 54-62页

作者： Qinzhong Feng Yang Chen Diandou Xu liyuan liu Zhengjie Zhang Shenyang Academy of Environmental Sciences Shenyang China The National Center for Nano-Science and Technology Laboratory for Bio-Environmental Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences Beijing China

2,4,6-trichlorophenol molecularly imprinted suspension polymer has been prepared and applied to the molecularly imprinted micro-solid-phase extraction procedure for selective preconcentration of phenolic compounds from environmental water samples. The influence of functional monomer, cross-linker, polymerization condition, porogen, and the ratio of template molecule and functional monomer to cross-linker on the size of the obtained particles were investigated. It was found that methyacrylic acid as functional monomer, divinylbenzene as cross-linker, the molar ratio of template molecule and functional monomer to cross-linker was 1:4:20, the amount of AIBN was 100 mg, ultraviolet radiation at 365 nm were the optimal conditions, and at these conditions, the polymers had the best adsorption efficiency and had the monodispersity of 2 - 3 μm microsphere particles. The characteristics of the MIMSPE method were valid by high performance liquid chromatography. This MIMSPE-HPLC method has been successfully applied to the direct preconcentration and determination of phenolic compounds (phenol, 4-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, pentachlorophenol) in environmental water samples.

关键词： Suspension Polymerization Molecularly Imprinted Micro-Solid-Phase Extraction 2 4 6-Trichlorophenol Phenolic Compounds High Performance Liquid Chromatography

基于离散元法的集料针片状含量对行车振动噪声的影响

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同济大学学报（自然科学版） 2018年第9期46卷 1225-1233页

作者：刘力源陈长张翛山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室山西太原030006 同济大学道路与交通工程教育部重点实验室上海201804

为了给低噪沥青路面的设计与施工提供参考,研究了沥青路面的集料针片状颗粒含量对行车振动噪声的影响.通过理论分析、现场噪声测试和离散元模拟计算,论证了行车振动噪声与轮地接触压力的关系,提出利用轮地接触压力的波动性评价行车振动... 详细信息

为了给低噪沥青路面的设计与施工提供参考,研究了沥青路面的集料针片状颗粒含量对行车振动噪声的影响.通过理论分析、现场噪声测试和离散元模拟计算,论证了行车振动噪声与轮地接触压力的关系,提出利用轮地接触压力的波动性评价行车振动噪声的方法.采用离散元颗粒流软件PFC3D构建了4种不同针片状颗粒含量的沥青路面模型以及车轮模型,分别模拟车轮在不同车速下在这4种路面上的运动过程,并计算轮地接触压力,分析其波动性,进而评价行车振动噪声.研究结果表明,当针片状颗粒含量为0、10%和15%时,针片状颗粒含量与行车振动噪声之间没有明显的相关性;当针片状颗粒含量为20%时,其行车振动噪声要明显高于低针片状颗粒含量的路面.因此针片状颗粒含量过大,不仅会影响集料的施工和易性、降低混凝土强度等,还会导致较高的行车振动噪声.

关键词：沥青路面离散元针片状颗粒含量行车振动噪声