检索结果-南通市图书馆

Zn-Zr-Al oxides derived from hydrotalcite precursors for ethanol conversion to diethyl carbonate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第4期40卷 515-522,M0002页

作者： Jian Zhang tingting yan Yusen yang Jialue Sun yanjun Lin Min Wei State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Ethanol conversion to high-value-added products has attracted considerable attention in both academic research and industrial *** this study,we synthesized a series of tunable acid–base bifunctional Zn-Zr-Al metal oxides(represented as Zn2ZrxAl-MMO)in light of the structural topotactic transformation of Zn2ZrxAl-hydrotalcite precursors(Zn2ZrxAl-LDH).The resulting Zn2ZrxAl-MMO catalysts were employed in the conversion of ethanol to diethyl *** Zr^4+ ion content of the LDH precursor plays a key role in modulating the acid-base properties and determining catalytic performance:the Zn2Zr0.1Al-MMO sample exhibits the optimal catalytic behavior with a diethyl carbonate(DEC)yield of 42.1%,which is the highest reported for metal oxide ***-property correlation investigations revealed that the synergic catalysis between medium-strong basic sites and weak acid sites plays a predominant role in the catalytic ***,in situ Fourier transform infrared measurements showed that the weak acidic site promotes activation adsorption of the reactant(urea)and the intermediate product(ethyl carbamate),while the medium-strong basic site accelerates ethanol ***,the Zn2Zr0.1Al-MMO catalyst has the advantages of cost effectiveness,good stability,and ***,the acid-base bifunctional catalysts developed in this work can be employed as promising candidates in acid-base catalytic reactions such as ethanol conversion.

关键词： Hydrotalcite Metal oxides Acid-base catalytic reactions Ethanol conversion

Magmatic-tectonic response of the South China Craton to the Paleo-Pacific subduction during the Triassic:a new viewpoint based on Well NK-1

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第1期42卷 58-89页

作者： Chan WANG Hao LIU Gang LI Zhen SUN tingting GONG Li MIAO Xiaowei ZHU Yunying ZHANG Weihai XU Wen yan Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir of Ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China College of Earth Science Chengdu University of TechnologyChengdu 610059China University of Chinese Academy of Sciences Beijing 100049China

The Nansha Block(NB)is one of the blocks separated from the southern margin of the South China Craton(SCC)by the western Pacific subduction,which contains rich information of geodynamic and tectonic *** reveal the essence of western Paleo-Pacific subduction during the Triassic period,Well NK-1 in this block was selected for petrographic study,and published research data from other cooperative teams were compared.A double-cycle pattern of basic to neutral magmatic volcanism was established,and 36 lithological rhythmic layers and representative cryptoexplosive breccia facies and welded tuff bands were *** with a reanalysis of published geochronological data,geochemical elements,and isotope geochemistry,we found that the rock assemblages could be divided into an intermediate-acid dacite(DA)series(SiO_(2)>65%)and basaltic(BA)series(Co<40μg/g),which was formed during the early Late Triassic((218.6±3.2)–(217.9±3.5)Ma).BA exhibits obvious calc-alkaline island-arc magmatic properties:(^(87)Sr/^(86)Sr)_i ratio ranging 0.70377–0.71118(average:0.70645),^(147)Sm/^(144)Nd ratio ranging 0.119–0.193(average:0.168),and chondrite-normalized rare earth element(REE)curves being flat,while DA exhibits remarkable characteristics of subducted island-arc andesitic magma:(^(87)Sr/^(86)Sr)_i ratio(0.70939–0.71129;average:0.71035),εNd(t)value(-6.2–-4.8;average:-5.6)andε_(Hf)(t)value(-2.9–-1.7,average:-2.2)show obvious crust-mantle mixing *** and DA reveal typical characteristics of island-arc magma systems and typeⅡenriched mantle(EM-Ⅱ)*** magma was likely resulted from the process whereby the continental crust frontal accretionary wedge was driven by the Paleo-Pacific slab subduction into the deep and began to melt,resulting in a large amount of melt(fluid)joined the asthenosphere on the side of the continental *** contrast,DA magma was likely resulted from the process whereby the plate front was forced to bend with increasing subducti

关键词： Paleo-Pacific tectonic domain tectonic evolution rift volcanic rock Nansha Block South China Craton

Efficient photocatalytic degradation of statin via optimization on ZnIn_(2)S_(4)/Bi_(2)WO_(6) Z-scheme heterostructure

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2024年第4期14卷 104-114页

作者： tingting Liu Libing Cao Mengge yan Yushan Hu Tianlong Ren Zheng Wu School of Environmental and Chemical Engineering Xi’an Key Laboratory of Textile Chemical Engineering Auxiliaries Engineering Research Center of Biological Resources Development and Pollution Control Universities of Shaanxi Province Key Laboratory of Textile Dyeing Wastewater Treatment Universities of Shaanxi Province Xi’an Polytechnic University No.19Jin Hua RoadXi’an710048P.R.China Key Laboratory of Northwest Water Resource Environment and Ecology MOE Xi’an University of Architecture and Technology No.13Yan Ta RoadXi’an710055P.R.China Northwest Branch of Beijing CCI Architectural Design Co. Ltd No.26Gao Xin RoadXi’an 710065P.R.China Xi’an Capital Water Company Limited No.368 Kun Ming RoadXi’an 710086P.R.China

Statins are widely used in the treatment of hyperlipidemia disease,which are refractory in the municipal sewage treatment *** photocatalytic degradation of statins by the Z-scheme heterostructured photocatalyst is confirmed,but the degradation mechanism of statins needs to be further *** this study,the effects of photocatalyst dosage,solution pH and humic acid(HA)on the photocatalysis of fluvastatin by ZnIn_(2)S_(4)/Bi_(2)WO_(6) Z-scheme heterostructured photocatalyst(ZIS/BWO photocatalyst)were investigated and the degradation mechanism was *** showed that adsorption of fluvastatin was improved with the increase of photocatalyst dosage,but photoinduced desorption and light scattering resulted in the decrease of the removal of fluvastatin with high dosage.0.2 g/L of the ZIS/BWO photocatalyst was optimal dosage.65.21%of fluvastatin was removed at pH=9,because high concentration of OH^(-)was conducive to produce·*** change of pH,competition of photons and active sites,and trapping of reactive oxygen species(ROS)by carboxyl group of HA combined to inhibit the photocatalysis of fluvastatin in the presence of *** C–C,C=C and C–N bonds of fluvastatin were attacked by a variety of ROS to generate degradable intermediates that were easily mineralized to H_(2)O and CO_(2).

关键词： Fluvastatin photocatalytic technology Z-scheme heterostructured photocatalyst reaction condition degradation mechanism

Heavy-atom-free orthogonal configurative dye 1,7-di-anthra-aza-BODIPY for singlet oxygen generation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 291-294页

作者： yan Zhu Jia Liu Meiheng Lv tingting Wang Dongxiang Zhang Rong Shang Xin-Dong Jiang Jianjun Du Guiling Wang Liaoning&Shenyang Key Laboratory of Functional Dye and Pigment Shenyang University of Chemical TechnologyShenyang 110142China Department of Cell Biology China Medical UniversityShenyang 110122China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China Department of Chemistry Graduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 7398526Japan

Spin-orbit,charge-transfer intersystem crossing(SOCT-ISC)can directly overcome the disadvantages of the traditional heavy-atom effect and improve the generation efficiency of reactive oxygen species(ROS).Since orthogonal molecular orbitals of donor-acceptor(D-A)pairs favor the SOCT-ISC transition,herein aza-borondipyrromethenes(aza-BODIPYs)with 1,7-di-anthracyl groups(An-azaBDP)was successfully prepared,owing to steric hindrance to produce a big dihedral angle between the two molecular orbital(MO)***,according to density functional theory(DFT)and time-dependent density functional theory(TDDFT),the energy difference between the S1-T1orbitals of An-aza BDP is small and more inclined towards ***-aza BDP can effectively generate singlet oxygen under light ***-aza BDP with light irradiation can induce apoptosis in SW620 cells,and can serve as a potential candidate for the treatment of cancer cells and tumors.

关键词： Orthogonal configuration Anthracene Heavy-atom-free Aza-BODIPY Singlet oxygen

在线全文

学校读者我要写书评

暂无评论

加拿大高校图书馆学习支持服务研究

图书馆学研究 2019年第1期 94-100,F0003页

作者：阎婷婷南京师范大学图书馆

加拿大高校图书馆学习支持服务发展较成熟,通过对加拿大著名高校学习支持服务从学习政策支持、学习资源支持、信息素养与学习能力培养支持、学习空间支持四大方面的分析,借鉴其经验并结合我国国情得到以下启示:高校图书馆应将学习支持... 详细信息

加拿大高校图书馆学习支持服务发展较成熟,通过对加拿大著名高校学习支持服务从学习政策支持、学习资源支持、信息素养与学习能力培养支持、学习空间支持四大方面的分析,借鉴其经验并结合我国国情得到以下启示:高校图书馆应将学习支持服务上升到战略层面,与校内各方建立有效持久的伙伴关系,同时深化和创新学习支持服务内容,制定相应的学习空间使用政策并配套相应服务,除此之外还要重视对学习支持服务的评估与研究。

关键词：学习支持服务加拿大高校图书馆

Ca^(2+)-independent ZmCPK2 is inhibited by Ca^(2+)-dependent ZmCPK17 during drought response in maize

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第7期66卷 1313-1333页

作者： Xiaoying Hu Jinkui Cheng Minmin Lu tingting Fang Yujuan Zhu Zhen Li Xiqing Wang Yu Wang yan Guo Shuhua yang Zhizhong Gong State Key Laboratory of Plant Environmental Resilience Frontiers Science Center for Molecular Design BreedingCenter for Crop Functional Genomics and Molecular BreedingCollege of Biological SciencesChina Agricultural UniversityBeijing 100193China College of Life Sciences Institute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China

Calcium oscillations are induced by different ***-dependent protein kinases(CDPKs/CPKs)are one major group of the plant calcium decoders that are involved in various processes including drought *** CPKs are ***,we identified ZmCPK2 as a negative regulator of drought resistance by screening an overexpression transgenic maize *** found that ZmCPK2 does not bind calcium,and its activity is mainly inhibited during short term abscisic acid(ABA)treatment,and dynamically changed in prolonged ***,ZmCPK2 interacts with and is inhibited by calcium-dependent ZmCPK17,a positive regulator of drought resistance,which is activated by ***17 could prevent the nuclear localization of ZmCPK2 through phosphorylation of ***2 interacts with and phosphorylates and activates ZmYAB15,a negative transcriptional factor for drought *** results suggest that drought stress-induced Ca^(2+)can be decoded directly by ZmCPK17 that inhibits ZmCPK2,thereby promoting plant adaptation to water deficit.

关键词： CDPK drought response phosphorylation stomatal movement transcriptional regulation

Crosstalk between CYP2E1 and PPARα substrates and agonists modulate adipose browning and obesity

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2022年第5期12卷 2224-2238页

作者： Youbo Zhang tingting yan Tianxia Wang Xiaoyan Liu Keisuke Hamada Dongxue Sun Yizheng Sun yanfang yang Jing Wang Shogo Takahashi Qiong Wang Kristopher W.Krausz Changtao Jiang Cen Xie Xiuwei yang Frank J.Gonzalez State Key Laboratory of Natural and Biomimetic Drugs and Department of Natural Medicines School of Pharmaceutical SciencesPeking UniversityBeijing 100191China Laboratory of Metabolism Center for Cancer ResearchNational Cancer InstituteNational Institutes of HealthBethesdaMD 20892USA School of Life Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Department of Physiology and Pathophysiology School of Basic Medical SciencesPeking Universitythe Key Laboratory of Molecular Cardiovascular ScienceMinistry of EducationBeijing 100191China

Although the functions of metabolic enzymes and nuclear receptors in controlling physiological homeostasis have been established, their crosstalk in modulating metabolic disease has not been *** ablation of the xenobiotic-metabolizing cytochrome P450 enzyme CYP2 E1 in mice markedly induced adipose browning and increased energy expenditure to improve obesity. CYP2 E1 deficiency activated the expression of hepatic peroxisome proliferator-activated receptor alpha(PPARa) target genes,including fibroblast growth factor(FGF) 21, that upon release from the liver, enhanced adipose browning and energy expenditure to decrease obesity. Nineteen metabolites were increased in Cyp2 e1-null mice as revealed by global untargeted metabolomics, among which four compounds, lysophosphatidylcholine and three polyunsaturated fatty acids were found to be directly metabolized by CYP2 E1 and to serve as PPARa agonists, thus explaining how CYP2 E1 deficiency causes hepatic PPARa activation through increasing cellular levels of endogenous PPARa agonists. Translationally, a CYP2 E1 inhibitor was found to activate the PPARa-FGF21-beige adipose axis and decrease obesity in wild-type mice, but not in liver-specific Pparanull mice. The present results establish a metabolic crosstalk between PPARa and CYP2 E1 that supports the potential for a novel anti-obesity strategy of activating adipose tissue browning by targeting the CYP2 E1 to modulate endogenous metabolites beyond its canonical role in xenobiotic-metabolism.

关键词： CYP2E1 PPARa FGF21 Metabolic enzyme Nuclear receptor Obesity

Self-aldol condensation of aldehydes over Lewis acidic rare-earth cations stabilized by zeolites

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2021年第4期42卷 595-605页

作者： tingting yan Sikai Yao Weili Dai Guangjun Wu Naijia Guan Landong Li School of Materials Science and Engineering Nankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry of the Ministry of Education Nankai UniversityTianjin 300071China

The self-aldol condensation of aldehydes was investigated with rare-earth cations stabilized by[Si]Beta zeolites in parallel with bulk rare-earth metal *** catalytic performance was achieved with all Lewis acidic rare-earth cations stabilized by zeolites and yttrium appeared to be the best metal *** to the results of several complementary techniques,i.e.,temperature-programmed surface reactions,in situ diffuse reflectance infrared Fourier transform spectroscopy,ultraviolet-visible diffuse reflectance spectroscopy,the reaction pathway and mechanism of the aldehyde self-aldol condensation over Y/Beta catalyst were studied in more *** functional theory calculations revealed that aldol dehydration was the rate-limiting *** hydroxyl group at the open yttrium site played an important role in stabilizing the transition state of the aldol dimer reducing the energy barrier for its *** acidic Y(OSi)(OH)2 stabilized by zeolites in open configurations were identified as the preferred active sites for the self-aldol condensation of aldehydes.

关键词： Self-aldol condensation Aldehyde Rare-earth cations Zeolite Lewis acid

Establishing a new testing protocol of the electrochemical stability window for electric double-layer capacitors

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Ruilin Hou Xiaoxi Zhao tingting Liang Qingyun Dou Shan Xu Xingbin yan School of Materials Science and Engineering Sun Yat-sen University Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences College of Engineering and Applied Sciences Nanjing University Center of Industrial Analysis and Testing Guangdong Academy of Science

The electrochemical stability window (ESW) is crucial for determining the energy density of electric double-layer capacitors(EDLCs).However,current ESW testing protocols of EDLCs are strongly affected by artificial factors,thereby leading to unreliable *** solve this problem,we first identify the key shortcomings of the traditional protocols by analyzing their test ***,taking an aqueous carbon-based EDLC as an example,we design a side reaction descriptor to represent the response difference in the charging capacitance to side reactions between the cyclic voltammetry and galvanostatic chargedischarge *** the aid of this descriptor,we propose a new ESW testing protocol,which is not only able to completely avoid the adverse influence of subjective factors but also fully consider the operating condition *** protocol can be extended from the single electrode to the full *** work proposes a more rigorous definition of ESW and provides a reliable protocol for evaluating the ESW of EDLCs.

关键词：