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Confined cobalt single-atom catalysts with strong electronic metal-support interactions based on a biomimetic self-assembly strategy

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Carbon Energy 2024年第9期6卷 156-171页

作者： Bowen Guo Zekun Wang Lei Zheng guang mo Hongjun Zhou Dan Luo State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Biogas Upgrading UtilizationCollege of New Energy and MaterialsChina University of Petroleum(Beijing)BeijingChina Beijing Key Laboratory of Micro-Nano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina School of Chemical Engineering Shandong Institute of Petroleum and Chemical TechnologyDongyingShandongChina School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina Institute of High Energy Physics Chinese Academy of SciencesBeijingChina

Designing high-performance and low-cost electrocatalysts for oxygen evolu-tion reaction(OER)is critical for the conversion and storage of sustainable energy *** by the biomineralization process,we utilized the phosphorylation sites of collagen molecules to combine with cobalt-based mononuclear precursors at the molecular level and built a three-dimensional(3D)porous hierarchical material through a bottom-up biomimetic self-assembly strategy to obtain single-atom catalysts confined on carbonized biomimetic self-assembled carriers(Co SACs/cBSC)after subsequent high-temperature *** this strategy,the biomolecule improved the anchoring efficiency of the metal precursor through precise functional groups;meanwhile,the binding-then-assembling strategy also effectively suppressed the nonspecific adsorption of metal ions,ultimately preventing atomic agglomeration and achieving strong electronic metal-support interactions(EMSIs).Experimental characterizations confirm that binding forms between cobalt metal and carbonized self-assembled substrate(Co–O_(4)–P).Theoretical calculations disclose that the local environment changes significantly tailored the Co d-band center,and optimized the binding energy of oxygenated intermediates and the energy barrier of oxygen *** a result,the obtained Co SACs/cBSC catalyst can achieve remarkable OER activity and 24 h durability in 1 M KOH(η10 at 288 mV;Tafel slope of 44 mV dec-1),better than other transition metal-based catalysts and commercial IrO_(2).Overall,we presented a self-assembly strategy to prepare transition metal SACs with strong EMSIs,providing a new avenue for the preparation of efficient catalysts with fine atomic structures.

关键词： biomimetic self-assembly support electronic metal-support interactions oxygen evolution reaction single atoms catalysts

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贵州黔南地区泡制酸菜中酵母菌的分离鉴定及特性研究

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粮食与油脂 2024年第9期37卷 103-108页

作者：全昌彬刘丽萍龙应霞莫光友张明泽黔南民族师范学院贵州都匀558000

从黔南地区非盐渍泡制酸菜中筛选出6株酵母菌,通过耐受试验、发酵特性分析等,分析其在黔南地区非盐渍泡制酸菜发酵及存储中的作用,并通过26S rDNA D1/D2区序列分析对菌株进行鉴定。结果显示:菌株SH2、SH3能耐受pH 3.0,且在白菜汁培养基... 详细信息

从黔南地区非盐渍泡制酸菜中筛选出6株酵母菌,通过耐受试验、发酵特性分析等,分析其在黔南地区非盐渍泡制酸菜发酵及存储中的作用,并通过26S rDNA D1/D2区序列分析对菌株进行鉴定。结果显示:菌株SH2、SH3能耐受pH 3.0,且在白菜汁培养基和非盐渍泡制酸菜发酵液中形成白膜。菌株SH5、SH6还原糖消耗多,产乙醇能力强,能耐受pH 2.5和50 g/L NaCl,菌株SH6能降低白菜汁培养基的腐胺、尸胺、精胺含量。经分子生物学鉴定,菌株SH1、SH2属毕赤酵母属(Pichia),SH3属地霉属酵母(Geotrichum),SH4、SH5、SH6属哈萨克斯坦酵母(Kazachstania)。结果表明,菌株SH5、SH6可适用于非盐渍泡制酸菜的发酵,菌株SH2、SH3对非盐渍泡制酸菜发酵及存储危害较大。

关键词：非盐渍泡制酸菜酵母菌菌株鉴定发酵特性

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A novel SAXS/XRD/XAFS combined technique for in-situ timeresolved simultaneous measurements

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Nano Research 2023年第1期16卷 1123-1131页

作者： Zhonghua Wu Yunpeng Liu Xueqing Xing Lei Yao Zhongjun Chen guang mo Lirong Zheng Quan Cai Hao Wang Jiajun Zhong Yuecheng Lai Lixiong Qian Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China

Synchrotron radiation based combined technique can provide multiple structural information simultaneously,which is an important development direction of structural *** this study,a novel small-angle X-ray scattering/X-ray diffraction/X-ray absorption fine structure(SAXS/XRD/XAFS)combined setup was constructed,where an area detector,a curved detector,and a point detector are,respectively,used for the measurements of SAXS,XRD,and XAFS signals.A detailed description about the combined setup was given.A minitype diamond detector coupled to a SAXS beamstop was used to record the transmitted X-ray intensity,making the scattering(SAXS and XRD)signal measurement compatible with the absorption(XAFS)signal measurement,avoiding mechanical *** two-way sampling strategy was used to acquire XAFS signals,shortening the non-counting *** two-way and one-way sampling strategies were ***-frequency sampling scheme was used to collect experimental signals,improving the measurement efficiency and signal-to-noise ratio.A detailed description and discussion about the high-frequency scheme were also given in this *** the rotation of monochromator,there is no mechanical movement in measurements,time resolution may reach the level of *** this SAXS/XRD/XAFS combined setup,SAXS,XRD,and XAFS signals can be acquired *** some in-situ sample environment system,the newlydeveloped combined technique can be used to track the structure evolution in complex *** the formation processes of(BiO)2CO3 and ZnAPO-34 particles,the changes of in-situ experimental data with reaction time demonstrate that SAXS/XRD/XAFS combined technique is feasible to track the dynamic process.

关键词： SAXS/XRD/XAFS combined technique in-situ time-resolution

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Bioinspired Closed-loop CPG-based Control of a Robotic Manta for Autonomous Swimming

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Journal of Bionic Engineering 2024年第1期21卷 177-191页

作者： Yiwei Hao Yonghui Cao Yingzhuo Cao Xiong mo Qiaogao Huang Lei Gong guang Pan Yong Cao School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Unmanned Vehicle Innovation Center Ningbo Institute of NPUNingbo 315103China Key Laboratory of Unmanned Underwater Vehicle Technology of Ministry of Industry and Information Technology Xi'an 710072China

Fish in nature exhibit a variety of swimming modes such as forward swimming,backward swimming,turning,pitching,etc.,enabling them to swim in complex scenes such as coral *** is still difficult for a robotic fish to swim autonomously in a confined area as a real ***,we develop an untethered robotic manta as an experimental platform,which consists of two flexible pectoral fins and a tail fin,with three infrared sensors installed on the front,left,and right sides of the head to sense the surrounding *** generate multiple swimming modes of the robotic manta and online switching of different modes,we design a closed-loop Central Pattern Generator(CPG)controller based on distance information and use a combination of phase difference and amplitude of the CPG model to achieve stable and rapid adjustment of yaw *** verify the autonomous swimming ability of the robotic manta in complex scenes,we design an experimental scenario with a concave *** experimental results show that the robotic manta can achieve forward swimming,backward swimming,in situ turning within the concave obstacle,and finally exit from the area safely while relying on the perception of external obstacles,which can provide insight into the autonomous exploration of complex scenes by the biomimetic robotic ***,the swimming ability of the robotic manta is verified by field tests.

关键词： Biomimetic robotic manta Central Pattern Generator Closed-loop control Backward swimming

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Correction of distorted X-ray absorption spectra collected with capillary sample cell

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Nuclear Science and Techniques 2023年第7期34卷 179-188页

作者： Hao Wang Yue-Cheng Lai Jia-Jun Zhong Yun-Peng Liu Lei Yao Li-Xiong Qian Xue-Qing Xing Zhong-Jun Chen guang mo Zhong-Hua Wu Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

In certain exceptional cases,capillary samples must be used to measure X-ray absorption spectra(XAS).However,the inho-mogeneous thickness of capillary samples causes XAS *** study discusses the distortion and correction of the XAS curve caused by the inhomogeneous thickness of capillary *** relationship between the distorted XAS curveμ′d_(eq)(measured values)and the real absorption coefficientμ_(s)d_(eq)(true values)of the sample was *** distortion was slight and negligible when the vertical size(2h)of the X-ray beam spot was smaller than 60%of the capillary tube’s inner diameter(2R_(in)).When h/R_(in)>1,X-ray leakage is inevitable and should be avoided during *** X-ray leakage caused by an X-ray beam spot size larger than the inner diameter of the capillary tube leads to serious compressed distortion of the XAS *** h/R_(in)<1,the distorted XAS data were well *** errors and their influence on the corrected XAS are also *** and corrections for distortions verify the feasibility and effectiveness of the corrected method.

关键词： XAS Capillary Compression distortion Correction Python

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Mesoporous Cu_(3−x)Zn_(x)(BTC)_(2)nanocubes synthesized in deep eutectic solvent and their catalytic performances

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Nano Research 2023年第3期16卷 3703-3708页

作者： Jingyang Hu Jianling Zhang Xiuniang Tan Xiuyan Cheng Zhuizhui Su Lixiong Qian Mingzhao Xu Yufei Sha Yanyue Wang Yisen Yang Yunpeng Liu guang mo Xueqing Xing Zhonghua Wu Beijing National Laboratory for molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

To develop high-performance metal-organic frameworks(moFs)for catalysis is of great ***,we synthesized the mesoporous Cu_(3−x)Zn_(x)(BTC)_(2)(BTC=benzene-1,3,5-tricarboxylate)nanocubes in a deep eutectic solvent of ZnCl_(2)/ethylene glycol *** route can proceed at room temperature and the reaction time needed is shortened to be 30 min,which is superior to the conventional solvothermal route that usually needs high temperature and long reaction *** formation mechanism of the mesoporous Cu_(3−x)Zn_(x)(BTC)_(2)nanocubes in deep eutectic solvent(DES)was investigated by in situ synchrotron X-ray diffraction/small angle X-ray scattering/X-ray absorption fine structure conjunction *** mesoporous Cu_(3−x)Zn_(x)(BTC)_(2)nanocubes exhibit high catalytic activity and reusability for cyanosilylation reaction of benzaldehyde and aerobic oxidation reaction of benzylic alcohol.

关键词： bimetallic metal-organic framework(moF) mesoporous nanocubes deep eutectic solvent formation mechanism catalytic performance

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Silicon PIN photodiode applied to acquire high-frequency sampling XAFS spectra

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Nuclear Science and Techniques 2022年第7期33卷 15-24页

作者： Yun-Peng Liu Lei Yao Bing-Jie Wang Jia-Jun Zhong Hao Wang Li-Xiong Qian Zhong-Jun Chen guang mo Xue-Qing Xing Wei-Fan Sheng Zhong-Hua Wu Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing100049China

Experimental techniques based on SR facilities have emerged with the development of synchrotron radiation(SR)***,detector miniaturization has become significant for the development of SR experimental *** this study,the miniaturization of a detector was achieved by coupling a commercial silicon PIN photodiode(SPPD)into a beamstop,aiming for it not only to acquire X-ray absorption fine structure(XAFS)spectra,but also to protect the subsequent two-dimensional detector from high-brilliance X-ray radiation damage in certain combination *** mini SPPD detector coupled to a beamstop was used as the rear detector in both the conventional sampling scheme and novel high-frequency(HF)sampling scheme to collect the transmission XAFS *** ion chambers were also used to collect the transmission XAFS spectra,which were used as the *** XAFS spectra were quantitatively analyzed and compared;the results demonstrated that the XAFS spectra collected by this SPPD in both the conventional sampling scheme and HF sampling scheme are *** study provides a new detector-selection scheme for the acquisition of the quick-scanning XAFS(QXAFS)and HF sampling XAFS *** SPPD detector presented in this study can partially meet the requirements of detector miniaturization.

关键词： Silicon PIN photodiodes Beamstop XAFS High frequency sampling

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Analyzing the service availability of mobile cloud computing systems by fluid-flow approximation

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Frontiers of Information Technology & Electronic Engineering 2015年第7期16卷 553-567页

作者： Hong-wu LV Jun-yu LIN Hui-qiang WANG guang-sheng FENG mo ZHOU College of Computer Science and Technology Harbin Engineering University Harbin 150001 China

mobile cloud computing （MCC） has become a promising technique to deal with computation- or data-intensive tasks. It overcomes the limited processing power, poor storage capacity, and short battery life of mobile devices. Providing continuous and on-demand services, MCC argues that the service must be available for users at anytime and anywhere. However, at present, the service availability of MCC is usually measured by some certain metrics of a real-world system, and the results do not have broad representation since different systems have different load levels, different deployments, and many other random factors. Meanwhile, for large-scale and complex types of services in MCC systems, simulation-based methods （such as monte- Carlo simulation） may be costly and the traditional state-based methods always suffer from the problem of state-space explosion. In this paper, to overcome these shortcomings, fluid-flow approximation, a breakthrough to avoid state-space explosion, is adopted to analyze the service availability of MCC. Four critical metrics, including response time of service, minimum sensing time of devices, minimum number of nodes chosen, and action throughput, are def＇med to estimate the availability by solving a group of ordinary differential equations even before the MCC system is fully deployed. Experimental results show that our method costs less time in analyzing the service availability of MCC than the Markov- or simulation-based methods.

关键词： Service availability mobile cloud computing Fluid-flow approximation Ordinary differential equations

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硒结合蛋白2的表达及与FKBP38蛋白的相互作用

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现代生物医学进展 2024年第17期24卷 3205-3210页

作者：唐敏怡莫广财区家铭王帅吴晓丽赵子建李芳红广东工业大学生物医药学院广东广州510006 南方医科大学顺德医院广东佛山528300

目的:构建重组pcDNA3.1-6×HIS-mSELENBP2质粒并探讨SELENBP2蛋白与FKBP38蛋白的相互作用。方法:首先以小鼠肝脏总RNA为模板,根据小鼠SELENBP2基因CDS序列设计的引物通过RT-PCR扩增SELENBP2蛋白编码序列,通过基因工程技术进行限制性核... 详细信息

目的:构建重组pcDNA3.1-6×HIS-mSELENBP2质粒并探讨SELENBP2蛋白与FKBP38蛋白的相互作用。方法:首先以小鼠肝脏总RNA为模板,根据小鼠SELENBP2基因CDS序列设计的引物通过RT-PCR扩增SELENBP2蛋白编码序列,通过基因工程技术进行限制性核酸内切酶酶切、与pcDNA3.1-6×HIS载体连接并转化入JM108感受态大肠杆菌扩增,挑选阳性单克隆大肠杆菌并提取质粒后得到重组pcDNA3.1-6×HIS-mSELENBP2质粒。重组质粒经测序分析鉴定后,使用Lipofectamine 3000转染试剂转染至小鼠肝细胞--AML12细胞中培养30 h,采用Western blot法检测蛋白表达情况。使用AlphaFold-Multimer预测SELENBP2蛋白与FKBP38蛋白相互作用的可能性及可能相互作用的结构域。最后,将重组质粒转染入过表达FKBP38蛋白的AML12细胞中,培养30 h后收集细胞蛋白样品,进行免疫共沉淀实验。结果:重组pcDNA3.1-6×HIS-mSELENBP2质粒测序结果显示插入的SELENBP2蛋白编码序列与GenBank中SELENBP2基因CDS序列相同,且转染重组质粒后,AML12细胞能有效表达SELENBP2-HIS融合蛋白。AlphaFold-Multimer结果显示SELENBP2蛋白与FKBP38蛋白相互作用的可能性较高,且作用于FKBP38蛋白的TPR结构域。免疫沉淀实验结果显示,在AML12细胞中,SELENBP2蛋白与FKBP38蛋白存在相互作用。结论:重组pcDNA3.1-6×HIS-mSELENBP2质粒构建成功并能在AML12细胞中正确表达,为进一步研究SENELBP2蛋白的功能奠定了基础。SELENBP2蛋白与FKBP38蛋白相互作用,为SELENBP2蛋白的研究进一步拓宽了思路,为深入研究SELENBP2蛋白在肝脏中的生物学功能提供了新方向。

关键词： SELENBP2蛋白重组pcDNA3.1-6xHIS-mSELENBP2质粒 FKBP38蛋白免疫共沉淀肝脏

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发现歌德:德国学者对自然研究家歌德的研究

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同济大学学报（社会科学版） 2009年第4期20卷 6-13页

作者：莫光华四川大学文学与新闻学院成都610064

诗人歌德一生有50多年坚持不懈地研究自然并有大量著述,其自然研究著作和文学作品是一个有机的整体。然而直到19世纪末,大多数歌德学家仍然把诗人歌德与自然研究家歌德割裂开来,对其自然研究活动和著述视若无睹。20世纪初对自然研究家... 详细信息

诗人歌德一生有50多年坚持不懈地研究自然并有大量著述,其自然研究著作和文学作品是一个有机的整体。然而直到19世纪末,大多数歌德学家仍然把诗人歌德与自然研究家歌德割裂开来,对其自然研究活动和著述视若无睹。20世纪初对自然研究家歌德的发现与重估,开辟了全新的歌德学视角,大大拓展了歌德研究的范围。当代学者在新的科学与文化语境中,再度关注歌德与自然的关系,多方发掘自然研究家歌德及其著作体现的思维方式,为历史悠久的歌德学注入了新的活力。

关键词：歌德自然自然研究歌德学

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