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Renewable conversion of coal gangue to 13-X molecular sieve for Cd^(2+)-containing wastewater adsorption performance

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Rare Metals 2024年第2期43卷 702-710页

作者： Le Kang Si-Fan Liu Da-Wei Yi Kai Wang Hui-ling du Hao-Qi Huang Peng Chen College of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an710054China School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao266000China School of Metallurgy Northeastern UniversityShenyang110819China School of Materials and Chemical Engineering Tongren UniversityTongren554300China

Using coal gangue(CG)as raw material,a new type of all solid-waste-based 13-X molecular sieve material was controllably prepared by alkali fusion-hydrothermal method.The synthetic molecular sieve was used as a solid adsorbent to treat Cd^(2+)-containing wastewater,and its adsorption behavior on Cd^(2+)in aqueous solution was studied and analyzed.The microstructure and morphology of the molecular sieve were investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM)and specific surface area analyzer.The results show that the synthesized 13-X molecular sieve has higher Brunauer–Emmett–Teller(BET)specific surface area with higher crystallinity and higher adsorption capacity for the heavy metal Cd^(2+).The adsorption process of Cd^(2+)by molecular sieve conforms to the Langmuir isotherm adsorption equation and Lagergren pseudo-second-order rate equation.Combined with thermodynamic calculation,it can be concluded that the adsorption process is physically monolayer,spontaneous and exothermic.In this study,a low-cost and naturally available synthesis method of 13-X molecular sieve is reported.Combined with its adsorption mechanism for Cd^(2+),it provides a feasible and general method for removing heavy metal ions from coal gangue and also provides a new way for the utilization of coal gangue with high added value.

关键词： Coal gangue Hydrothermal synthesis 13-X molecular sieve Adsorption Wastewater containing Cd^(2+)

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非线性广义时滞Markov跳变系统的H_(∞)滑模控制

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东北大学学报（自然科学版） 2024年第2期45卷 153-159页

作者：杨冬梅杜玲秀祝春霞东北大学理学院辽宁沈阳110819

研究了一类转移速率部分未知的广义时滞Markov跳变系统的H_(∞)滑模控制问题.首先,对广义时滞Markov跳变系统设计了积分型滑模面,并求出对应的等效控制器.之后,构建Lyapunov泛函,通过线性矩阵不等式方法得到闭环系统随机容许且满足H_(∞... 详细信息

研究了一类转移速率部分未知的广义时滞Markov跳变系统的H_(∞)滑模控制问题.首先,对广义时滞Markov跳变系统设计了积分型滑模面,并求出对应的等效控制器.之后,构建Lyapunov泛函,通过线性矩阵不等式方法得到闭环系统随机容许且满足H_(∞)性能γ的充分条件,运用加减项方法以及引入自由权矩阵,使得到的结果降低了保守性;对滑模力学分析,设计了滑模控制器,使得系统能在有限时间内到达滑模面上.最后,通过数值算例与仿真验证了理论的可行性.

关键词： Markov跳变系统时滞系统滑模控制广义系统线性矩阵不等式

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Pathways of meridional atmospheric moisture transport in the central Arctic

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Acta Oceanologica Sinica 2020年第5期39卷 55-64页

作者： Daohuan Xu ling du Jingkai Ma Huangyuan Shi Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

Atmospheric moisture transport plays an important role in latent heat release and hydrologic interactions in the Arctic.In recent years,with the rapid decline in sea ice,this transport has changed.Here,we calculated the vertically integrated atmospheric moisture meridional transport(AMTv)from two global reanalysis datasets,from1979–2015,and found moisture pathways into the central Arctic.Four stable pathways showed an occurrence frequency greater than 70%,and these pathways exhibited a perennial seasonal pattern in the atmosphere above the Laptev Sea Pathway(LSP),Canadian Arctic Archipelago Pathway(CAAP),both sides of the Greenland plateau.Another seasonal pathway appeared above the east of the Chukchi Sea(CSP)during the melting/freezing months(March to September).Through these pathways,AMTv contributed a total moisture exchange of60%–80%—averaged over a 75°N circle—and focused on the low troposphere.Transports across the LSP,CSP and CAAP pathways likely create an enclosed moisture route.Meridional moisture fluxes are intensified in the Pacific sector of Arctic(PSA),especially during melting/freezing months.AMTv interannual variabilities are illustrated mainly in the Laptev Sea and the east Greenland pathway.Results indicate that accompanying a tendency for a stronger Beaufort Sea High in this sea level pressure field,AMTv through PSA pathways,switched from output to input,and approximately 960 km^3 of equivalent liquid water was transferred into the central Arctic during each decade.The detrended AMTv increment is highly correlated with the rapid decline of old ice areas(correlation coefficient is–0.78)for their synchronous fluctuations in the 1980 s and the last decade.

关键词： atmospheric moisture transport meridional moisture pathway AMTv during melting/freezing months Pacific Arctic sector

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基于QCA方法的企业绿色创新水平影响机制研究

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物流工程与管理 2024年第4期46卷 102-107页

作者：杜玲福州理工学院商学院福建福州350506

绿色创新已成为新时期各地区经济高质量发展的助推器,然而,对于如何促进企业取得高水平绿色创新一直没有得到有效解决。通过搜索国内30个省(市、自治区)的数据资料,采用定性比较分析方法(QCA)对创新资源、外部压力与环保意愿3个层面的7... 详细信息

绿色创新已成为新时期各地区经济高质量发展的助推器,然而,对于如何促进企业取得高水平绿色创新一直没有得到有效解决。通过搜索国内30个省(市、自治区)的数据资料,采用定性比较分析方法(QCA)对创新资源、外部压力与环保意愿3个层面的7个条件进行整合分析,发现高绿色创新水平的驱动机制包括资源推动型、政策依赖型以及环保意愿型等三种类型。对于企业高绿色创新投入以及政府扶持力度大的地区,环境规制是提升绿色创新水平的重要条件。而对于企业自身绿色环保意识较强的地区,省际研发技术溢出或者外商投资的数量是影响当地企业绿色创新的主要因素,此时环境规制作用并不显著。研究结果为进一步优化创新资源配置、营造治理环境从而灵活促进各区域绿色创新水平提供了借鉴和参考。

关键词：绿色创新水平创新资源外部压力环保意愿定性比较分析

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A new encryption scheme for surveillance videos

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Frontiers of Computer Science 2015年第5期9卷 765-777页

作者： Xiaochun CAO Meili MA Xiaojie GUO ling du Dongdai LIN School of Computer Science and Technology Tianjin University Tianjin 300072 China SKL Of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China

In this paper, we propose a novel framework to encrypt surveillance videos. Although a few encryption schemes have been proposed in the literature, they are not sufficiently efficient due to the lack of full consideration of the characteristics of surveillance videos, i.e., intensive global redundancy. By taking advantage of such redundancy, we design a novel method for encrypting such videos. We first train a background dictionary based on several frame observations. Then every single frame is parsed into the background and foreground components. Separation is the key to improve the efficiency of the proposed technique, since encryption is only carried out in the foreground, while the background is skillfully recorded by corresponding background recovery coefficients. Experimental results demonstrate that, compared to the state of the art, the proposed method is robust to known cryptanalytic attacks, and enhances the overall security due to the foreground and background separation. Additionally, our encryption method is faster than competing methods, which do not conduct foreground extraction.

关键词： surveillance videos video encryption background and foreground separation

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产苦马豆素的疯草内生真菌研究进展

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草地学报 2024年第2期32卷 358-368页

作者：李丹卢萍袁博杜玲李玉玲高峰姜凯内蒙古师范大学生命科学与技术学院内蒙古呼和浩特010020 内蒙古自治区高等学校蒙古高原生物多样性保护与可持续利用重点实验室内蒙古呼和浩特010020

含苦马豆素(Swainsonine, SW)的棘豆属(Oxytropis DC.)和黄芪属(Astragalus L.)植物称为疯草,其共生着一种疯草内生真菌(Alternaria Section Undifilum oxytropis)。疯草中的SW由其内生真菌产生,而非由宿主植物产生。SW是一种吲哚里西... 详细信息

含苦马豆素(Swainsonine, SW)的棘豆属(Oxytropis DC.)和黄芪属(Astragalus L.)植物称为疯草,其共生着一种疯草内生真菌(Alternaria Section Undifilum oxytropis)。疯草中的SW由其内生真菌产生,而非由宿主植物产生。SW是一种吲哚里西啶类生物碱,牲畜食用疯草后引起中毒,严重者死亡,对我国畜牧业危害巨大。本文对棘豆属疯草的分类与分布,疯草内生真菌的分类、分布、传播方式及形态学差异,不同真菌中SW的合成相关酶及合成途径的研究进展进行综述,讨论了SW合成途径及其关键酶的作用,旨在为疯草内生真菌的研究、利用及SW合成途径的明晰提供参考。

关键词：疯草内生真菌苦马豆素次级代谢产物棘豆属植物疯草

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Polarization control of above-threshold ionization spectrum in elliptically polarized two-color laser fields

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Chinese Physics B 2024年第4期33卷 136-144页

作者：金发成杨慧慧宋晓红李飞杜玲玲薛红杰魏丽敏白悦刘浩翔王兵兵杨玮枫 Faculty of Science Xi'an Aeronautical InstituteXi'an 710077China School of Physics and Optoelectronic Engineering Hainan UniversityHaikou 570288China Center for Theoretical Physics Hainan UniversityHaikou 570288China Laboratory of Optical Physics Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China College of Science Shantou UniversityShantou 515063China University of Chinese Academy of Sciences Beijing 100049China

We study the above-threshold ionization(ATI)process of atoms exposed to fundamental and high-frequency lasers with arbitrary ellipticity by applying the frequency-domain theory.It is found that the angular-resolved ATI spectrum is sensitive to ellipticities of two lasers and emitted angles of the photoelectron.Particularly for the photon energy of the highfrequency laser more than atomic ionization potential,the width of plateau tends to a constant with increasing ellipticity of fundamental field,the dip structure disappears with increasing ellipticity of the high-frequency field.With the help of the quantum channel analysis,it is shown that the angular distribution depends mainly on the ellipticity of high-frequency field in the case that its frequency is high.Moreover,one can see that the maximal and minimal energies in quantum numerical results are in good agreement with the classical prediction.Our investigation may provide theoretical support for experimental research on polarization control of ionization in elliptically polarized two-color laser fields.

关键词： above-threshold ionization two-color laser polarization control

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Semi-fragile watermarking for image authentication based on compressive sensing

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Science China(Information Sciences) 2016年第5期59卷 248-250页

作者： ling du Xiaochun CAO Wei ZHANG Xinpeng ZHANG Na LIU Jianguo WEI School of Computer Science and Technology Tianjin University School of Computer Shenyang Aerospace University State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences School of Communication and Information Engineering Shanghai University

Dear editor,With the aid of sophisticated photoediting software,multimedia content security is becoming increasingly prominent[1,2].The problems of verifying the integrity and recovering the alterations have been a major research topic for information security and multimedia[3–6].Semi-fragile watermarking techniques are more powerful in dealing with such cases,which are fragile to malicious modifications meanwhile robust to incidental

关键词： DCT Semi-fragile watermarking for image authentication based on compressive sensing

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用于恶性肿瘤治疗的^(225)Ac放射性药物的研究现状与展望

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核化学与放射化学 2024年第1期46卷 46-53,I0005页

作者：柳佳娣徐度玲李鸿岩张红中国科学院近代物理研究所医学物理研究室甘肃兰州730000 甘肃省同位素实验室甘肃兰州730300 中国科学院大学核科学与技术学院北京100039 先进能源科学与技术广东省实验室广东惠州516006 中国科学院重离子辐射生物学与医学重点实验室甘肃兰州730000

^(225)Ac具有半衰期较长(10 d)、射程短(<100μm)和高能量沉积(80~100 keV/μm)等优点,是重要的医用α核素之一。^(225)Ac衰变产生的高传能线密度α粒子可以导致肿瘤细胞的DNA双链断裂,具有重要的临床应用价值。本文综述了^(225)Ac的衰... 详细信息

^(225)Ac具有半衰期较长(10 d)、射程短(<100μm)和高能量沉积(80~100 keV/μm)等优点,是重要的医用α核素之一。^(225)Ac衰变产生的高传能线密度α粒子可以导致肿瘤细胞的DNA双链断裂,具有重要的临床应用价值。本文综述了^(225)Ac的衰变特性、生产来源以及^(225)Ac与靶向配体偶联的螯合剂,总结了^(225)Ac-前列腺特异性膜抗原(PSMA)-617、^(225)Ac-PMSA-I&T、^(225)Ac-1,4,7,10-四氮杂环十二烷-1,4,7,10-四羧酸(DOTA)-SP和^(225)Ac-1,4,7,10-四氮杂环十二烷-N,N′,N″,N-四乙酸d-苯丙氨酸1-酪氨酸3-奥曲肽(DOTATE)等药物在前列腺癌、脑胶质瘤、乳腺癌和肺癌治疗中的研究及临床应用进展,展望了^(225)Ac治疗药物研发面临的困难与挑战,以期为^(225)Ac放射性药物在恶性肿瘤治疗中的研究与应用提供参考。

关键词： ^(225)Ac α核素治疗癌症

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Multifactorial role of HIV-Vpr in cell apoptosis revealed by a naturally truncated 54aa variant

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Chinese Medical Journal 2021年第7期134卷 845-847页

作者： ling du Cui-Song Wu Jun Sun Tong Yu Pan-Pan Lyu San-Feng Han Chao Qiu Zhe-Feng Meng Key Laboratory of digestive cancer full cycle monitoring and precise intervention of Shanghai Municipal Health Commission Minhang HospitalFudan UniversityShanghai 201199China Department of infection the Third People’s Hospital of Zhenjiang CityZhenjiangJiangsu 212021China Institutes of Biomedical Sciences Shanghai Medical CollegeFudan UniversityShanghai 200032China.

Although antiretroviral therapy(ART)is effective at suppressing the human immunodeficiency virus type 1(HIV-1)replication,HIV-1 infection is still a global public health problem.HIV-1 accessory protein viral protein R(Vpr)is a multifunctional protein with a primary role in regulating cellular apoptosis.[1]The amino acid(aa)positions 52-96 in the C-terminus of Vpr were identified as the apoptosis-regulating domain.[2,3]In this study,we found a natural Vpr variant truncated at the 54 aa position(*54Vpr)from HIV patients in the acquired immune deficiency syndrome(AIDS)phase that mediated both pro-and antiapoptotic cellular effects by interacting with distinct adenine nucleotide translocator(ANT)isoforms.A novel apoptosis-regulating domain was further identified in the 23-37 aa position in the N-terminus of Vpr.

关键词： Vpr apoptosis HIV

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