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Anomalous metastable hcp Ni nanocatalyst induced by non-metal N doping enables promoted ammonia borane dehydrogenation

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Journal of Energy Chemistry 2023年第4期79卷 72-82页

作者： Ping li Yuqi Huang Quhua Huang Ran Chen jixin li Shuanghong Tian School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275GuangdongChina

Developing high-performing non-noble transition metal catalysts for H_(2) evolution from chemical hydrogen storage materials is of great significance for the hydrogen economy system, yet challenging. Herein,we present for the first time that anomalous metastable hexagonal close-packed Ni nanoparticles induced by heteroatom N doping encapsulated in carbon(N-hcp-Ni/C) can exhibit admirable catalytic performance for ammonia borane(AB) dehydrogenation, prominently outperforming conventional fcc Ni counterpart with similar morphology and favorably presenting the state-of-the-art *** experimental and theoretical studies unravel that unusual hcp phase engineering of Ni together with N doping could induce charge redistribution and modulate electronic structure, thereby facilitating H_(2)O adsorption and expediting H_(2)O dissociation(rate-determining step). As a result, AB dehydrogenation can be substantially boosted with the assistance of N-hcp-Ni/C. Our proposed strategy highlights that unconventional crystal phase engineering coupled with non-metal heteroatom doping is a promising avenue to construct advanced transition metal catalysts for future renewable energy technologies.

关键词： Hcp Ni Non-metal doping Phase engineering Electronic regulation Ammonia borane dehydrogenation

Dimensional reduction enhances photocatalytic carbon dioxide reduction performance of metal-organic frameworks

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Nano Research 2024年第5期17卷 3653-3659页

作者： Kaiyue Ma jixin li Jinlu liu Chunguang li Zhan Shi Shouhua Feng State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

Metal-organic frameworks(MOFs)have shown significant potential as *** has been widely assumed that all catalytic active sites within MOFs are functional in photocatalytic reactions but for a three-dimensional MOF,whether the internal catalytic active sites can effectively absorb light and actively contribute to photocatalytic reactions remains to be *** this context,we synthesized a two-dimensional nanosheet MOF(2D-MOF)and a three-dimensional bulk MOF(3D-MOF)composed of Zr^(6) clusters and tetracarboxylic porphyrin(TCPP)by the approach described in the ***(bpy)(CO)^(3)Cl(bpy=2,2’-bipyridine),which has remarkable CO_(2) photoreduction ability,was introduced to the two MOFs to create two new photocatalysts 2D-MOF-Re and 3D-MOF-Re,*** CO_(2) reduction experiments show that based on the equal number of catalytic active sites,the CO turnover number(TON)of 2D-MOF-Re reaches 27.8 in 6 h,which is 50 times that of *** result shows that certain catalytic active sites inside the bulk MOF are inactive due to the inability to absorb *** study illuminates the potential of the dimensional reduction approach in the design of photocatalysts to exploit the capabilities fully.

关键词： photocatalysis CO_(2)reduction metal-organic frameworks(MOFs) nanosheets light absorption

Comparative assessment of phenolics,antioxidant and antiproliferative activities between Hippophae rhamnoides *** and *** leaf in Qinghai-Tibet Plateau

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Food Bioscience 2022年第2期46卷 148-157页

作者： Juan Wei Tingting Su Hailan Su Yumei Jiang jixin li Yang Bi College of Food Science and Engineering Gansu Agricultural UniversityLanzhou730070China

Hippophae rhamnoides ***(Rha)and ***(Tib)are two species of sea buckthorn which distribute in Qinghai-Tibet *** results showed that both sea buckthorn leaf exhibited high total phenolic and flavonoid content,and Rha leaf showed much higher *** addition,66 phenolic compounds were detected,belonging to classes of benzoic acid derivatives,flavonols,flavanols,flavanones,and so *** of benzoic acid derivatives and flavonols were most abundant,among them ellagic acid and rutin were the most and second abundant ***,methyl gallate,2,6-dihydroxybenzoic acid,4-hydroxybenzoic acid,gentisic acid,narcissin,astragalin,nicotiflorin,prunin,procyanidin B3,cyanidin 3-O-rutinoside chloride,delphinidin 3-glucoside,gallocatechin,taxifolin,aromadendrin and trans-3,3′,4′,5,5′,7-Hexahydroxyflavanone were the first time to be identified in SBT ***,significant free radical scavenging effects of ABTS and DPPH,ferric reducing antioxidant ability,cellular antioxidant properties and anti-proliferation activity against HepG2 cells were observed in the aqueous ethanol extracts of sea buckthorn *** Rha showed stronger inhibitory effects,which might due to the higher content of total phenolic and flavonoid *** finding clearly supported that Rha leaf as a wild and non-pollution plant could be a better choice as a healthy food resource.

关键词： Sea buckthorn Phenolic compounds Flavonoids Antioxidant capacity Antiproliferation activity

Sarcaglarols A-D, lindenane-Monoterpene Heterodimers from Sarcandra glabra Based on Molecular Networks

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Chinese Journal of Chemistry 2021年第1期39卷 129-136页

作者： Yongyue Wang Zhirong Cui Jun Chi Pengfei Tang Meihui Zhang jixin li Yongyi li Hao Zhang Jun Luo lingyi Kong Jingsu Key laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Taditional Chinese PharmacyChina Pharmaceutical UniversityNanjingJiangsu 210009China

Sarcaglarols A-D(1-4),two pairs of lindenane-monoterpene heterodimers fused by a 1,2-dioxane moiety,were discovered and isolated from the leaves of Sarcandra glabra guided by MS/MS molecular networking-based *** planar structures,absolute configurations of basic skeleton and flexible polyhydric side chain were established by analysis of HRESIMS,NMR spectroscopic data,ECD spectrum,and the X-ray diffraction study of isopropylidene *** intermolecular[2+2+2]cycloaddition may play a key role in the biosynthesis pathway of the 1,2-dioxane moiety fused lindenane-monoterpene heterodimer skeleton,which can be recognized as the biogenetic precursors of our previous reported lindenane-normonoterpene *** addition,compounds 1,3 and 4 exhibited moderate inhibitory effects of lipid accumulation in free fatty acid-exposed L02 cells.

关键词： Sarcandra glabra Molecular networks Natural products Structural elucidation Peroxides

Chlospicenes A and B,cyclopropane cracked lindenane sesquiterpenoid dimers with anti-nonalcoholic steatohepatitis activity from Chloranthus henryi

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Chinese Chemical Letters 2022年第9期33卷 4257-4260页

作者： jixin li Zhirong Cui Yongyi li Chunhua Han Yanqiu Zhang Pengfei Tang Letian Cui Hao Zhang Jun Luo lingyi Kong Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

Guided by MS/MS molecular networks strategy,chlospicenes A and B(1 and 2),the first example of cyclopropane moiety cracked lindenane sesquiterpene Michael addition dimers,along with their biogenetic analogues(3 and 4),were targetedly discovered from the roots of Chloranthus *** structures including absolute configurations were characterized by NMR,ECD and X-ray diffraction *** plausible biogenic pathway speculation indicated that cyclopropylcarbinyl rearrangement may dominate the key crack of cyclopropane *** addition,compounds 1 and 2 showed significant anti-nonalcoholic steatohepatitis(NASH)activity in free fatty acid(FFA)-induced HepG2 cells by decreasing intracellular lipid accumulation.

关键词： Chloranthus henryi. lindenane sesquiterpenoid dimer Molecular networks Cyclopropylcarbinyl rearrangement Anti-nonalcoholic steatohepatitis

Spirolindemers A and B,lindenane Sesquiterpenoid Oligomers Equipped with Oxaspiro[4.5]decane from Chloranthus henryi

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Chinese Journal of Chemistry 2022年第5期40卷 603-608页

作者： jixin li Jun Chi Pengfei Tang Yunpeng Sun Weijia Lu Wenjun Xu Yongyue Wang Jun Luo lingyi Kong Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjingJiangsu210009 China

Spirolindemers A and B,unprecedented lindenane sesquiterpenoid dimer(1)and trimer(2)equipped with oxaspiro[4.5]decane unit,were discovered from the medicinal plant Chloranthus *** structures including absolute configurations were achieved by HRMS,NMR,ECD,X-ray diffraction analyses,and quantum chemical ***,hetero-and homo-Diels-Alder additions may dominate the formation of oxaspiro[4.5]decane and spiro[4.5]decane skeletons,*** 1 showed anti-inflammatory activity by inhibiting the expression of iNOS and COX-2.

关键词： lindenane sesquiterpenoid oligomers Chloranthus henryi Natural products Structure elucidation Biological activity

Extracts from Chinese Seabuckthorn Berry Have Antimicrobial Activity in vitro

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Agricultural Science & Technology 2016年第6期17卷 1277-1280,1284页

作者： Ruojun DING Yang BI jixin li Yumei JIANG College of Food Science & Engineering Gansu Agricultural University

Chinese seabuckthorn berry contains functional components. The berry was extracted by ethanol-water solution. MTT assay and growth rate method were applied to determine antibacterial ability in vitro of the extract solution. The antibacterial and antifungal assay indicated that the extract exhibited different degree of inhibitory activity. The result showed that the extract at a concentration of 1 250 mg/L had the maximum inhibitory effect against Escherichia coli, Bacillus subtilis, and Staphylococcus aureus. Inhibitory effect against B. subtilis was much larger than that against the other two bacterial species. MIC values(minimum inhibitory concentration) of the extract on three bacterial species were 5 000, 1 250, and 1 000 mg/L respectively. IC_(50)(50% inhibiting concentration) evaluation of Trichoderma viride, Rhizopus stolonifer, Aspergillus niger, Penicillium expansum, and Vintage Red indicated that the berry had the strongest inhibitory effect against P. expansum(5 520 mg/L), while it had the weakest inhibitory effect against R. stolonifer(18 870 mg/L). The results proved that seabuckthorn berry had highly effective and comprehensive antimicrobial function.

关键词： Chinese seabuckthorn Antibacterial activity Bacteria Fungus

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一种红外空空导弹全向制导律设计与仿真

弹箭与制导学报 2014年第6期34卷 25-28页

作者：李记新中国空空导弹研究院河南洛阳471009

为实现全向攻击,红外空空导弹需要解决全向制导律设计问题。基于虚拟目标算法和大离轴制导律,提出了一种三维空间全向制导律。全向制导律与大离轴制导律具有统一的形式,但越肩发射初始转弯段和末制导段的制导信息来源不同。针对几种典... 详细信息

为实现全向攻击,红外空空导弹需要解决全向制导律设计问题。基于虚拟目标算法和大离轴制导律,提出了一种三维空间全向制导律。全向制导律与大离轴制导律具有统一的形式,但越肩发射初始转弯段和末制导段的制导信息来源不同。针对几种典型攻击条件进行了数字仿真。分析表明,全向制导律具有良好的越肩发射或擦肩发射性能,能够应用于红外空空导弹全向攻击制导设计。

关键词：空空导弹全向攻击越肩发射擦肩发射制导律

Measurement Research Based on Bayesian Structural Equation Cognitive Model

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Journal of Applied Mathematics and Physics 2024年第4期12卷 1163-1177页

作者： Shuixian Fei Sanzhi Shi jixin li Jiali Zheng Xinyi Yu Yifan Huang Xiang li School of Mathematics and Statistics Changchun University of Science and Technology Changchun China

The Bayesian structural equation model integrates the principles of Bayesian statistics, providing a more flexible and comprehensive modeling framework. In exploring complex relationships between variables, handling uncertainty, and dealing with missing data, the Bayesian structural equation model demonstrates unique advantages. Therefore, Bayesian methods are used in this paper to establish a structural equation model of innovative talent cognition, with the measurement of college students’ cognition of innovative talent being studied. An in-depth analysis is conducted on the effects of innovative self-efficacy, social resources, innovative personality traits, and school education, aiming to explore the factors influencing college students’ innovative talent. The results indicate that innovative self-efficacy plays a key role in perception, social resources are significantly positively correlated with the perception of innovative talents, innovative personality tendencies and school education are positively correlated with the perception of innovative talents, but the impact is not significant.

关键词： Bayesian Structural Equation Model Innovative Talents Measure of Cognition Innovative Self-Efficacy Social Resources