维普中文期刊产品整合服务
19篇 您的检索式:作者名="Shanjun Chen"
    题名 作者 年代 出处 被引量
1Selective Electrochemical Reduction of Nitrogen to Ammonia by Adjusting the Three-Phase Interface显示文摘The electrochemical nitrogen reduction reaction(NRR)provides a sustainable and alternative avenue to the Haber-Bosch process for ammonia(NH_(3))synthesis.Despite the great efforts made on catalysts and electrolytes,unfortunately,current NRR suffers from low selectivity due to the overwhelming competition with the hydrogen evolution reaction(HER).Here,we present an adjusted three-phase interface to enhance nitrogen(N_(2))coverage on a catalyst surface and achieve a record-high Faradic efficiency(FE)up to 97%in aqueous solution.The almost entirely suppressed HER process combined with the enhanced NRR activity,benefiting from the efficient three-interface contact line,is responsible for the excellent selectivity toward NH_(3),as evidenced by the theoretical and experimental results.Our strategy also demonstrates the applicability to other catalysts that feature strong H adsorption ability,to boost the FE for NH_(3) synthesis above 90%and to improve the NRR activity by engineering the catalysts.Haiyan Wang Yuzhuo Chen Ruxue Fan Jiadong Chen Zhe Wang Shanjun Mao Yong Wang 2019Research2019,,1:4
2into the Role of Additives in Catalytic Synthesis of Insight Cyclohexylamine from Nitrobenzene显示文摘Cyclohexylamine is a versatile intermediate in various chemical industries,which can be expediently synthesized via hydrogenation of aniline or nitrobenzene.However,such processes always suffer from side reactions.Many reports have found that specific additives can suppress the formation of side products,but the mechanism is still not clear.In this work,results suggest that it is the hydroxide ion of alkali metal hydroxides,rather than the cations,which plays a key role in suppressing the side reactions on supported Ru-based catalysts.With the assistance of LiOH,the selectivity toward cy- clohexylamine increased from 85.4% to 100%.Side products,such as dicyciohexylamine,cyclohexanol and N-isopropyl cyclohexylamine,could no longer be detected.Theoretical calculations further disclosed that addition of alkali metal hydroxides inhibited the dissociation of enamine and decreased the adsorption energy of cyclohexylamine,which might be the reasons for a better selectivity.However,the addition of alkali metal hydroxides reduced the activity of nitrobenzene hydrogenation by unfolding the condensation reaction route.To recover or even further enhance the catalytic performance,a second metal component was introduced and the resultant RuNi/AC exhibited a significant improvement in activity compared with Ru/AC.Xuefeng Li Zhe Wang Shanjun Mao Yiqing chen Minghui Tang Haoran Li Yong Wang 2018Chinese Journal of Chemistry2018,36,12:4
3雷公藤红素通过靶向核受体Nur77促进损伤线粒体自噬而抑制炎症反应显示文摘文章简介线粒体在细胞死亡、自噬、免疫和炎症中起着不可或缺的作用。前期研究发现,孤儿核受体Nur77通过靶向线粒体诱导细胞凋亡。本文报道了Nur77作为具有抗炎作用的雷公藤红素的直接靶点,介导雷公藤红素通过自噬清除损伤线粒体,抑制炎症反应而达到治疗炎症疾病包括肥胖症的功能。Mengjie Hu Qiang Luo Gulimiran Alitongbieke Shuyi Chong Chenting Xu Lei Xie Xiaohui Chen Duo Zhang Yuqi Zhou Zhaokai Wang Xiaohong Ye Lijun Cai Fang Zhang Huibin Chen Fuquan Jiang Hui Fang Shanjun Yang Jie Liu Maria T.Diaz-Meco Ying Su Hu Zhou Jorge Moscat Xiangzhi Lin 张晓坤 2018科学新闻2018,0,4:3
4Cooperative Assembly of Asymmetric Carbonaceous Bivalve-Like Superstructures from Multiple Building Blocks显示文摘Te assembly of superstructures from building blocks is of fundamental importance for engineering materials with distinct morphologies and properties,and deepening our understanding of self-assembly processes in nature.Up to now,it is still a great challenge in materials science to construct multiple-component superstructure with unprecedented architectural complexity and symmetry from molecular.Here,we demonstrate an improved one-pot hydrothermal carbonization of biomass strategy that is capable of fabricating unprecedented asymmetric carbonaceous bivalve-like superstructures with in suit generated solid particles and ordered porous polymers as two kinds of building blocks.In our system,diferent building blocks can be controllably generated,and they will assemble into complex superstructures through a proposed“cooperative assembly of particles and ordered porous polymers”mechanism.We believe that this assembly principle will open up new potential felds for the synthesis of superstructures with diverse morphologies,compositions,and properties.Lei Xie Haiyan Wang Chunhong Chen Shanjun Mao Yiqing Chen Haoran Li Yong Wang 2018Research2018,,1:2
5Alkali-metal(Li, Na, and K)-adsorbed MoSi_(2)N_(4) monolayer: an investigation of its outstanding electronic, optical, and photocatalytic properties显示文摘Single-layer MoSi_(2)N_(4),a high-quality two-dimensional material,has recently been fabricated by chemical vapor deposition.Motivated by this latest experimental work,herein,we apply first principles calculations to investigate the electronic,optical,and photocatalytic properties of alkali-metal(Li,Na,and K)-adsorbed MoSi_(2)N_(4) monolayer.The electronic structure analysis shows that pristine MoSi_(2)N_(4) monolayer exhibits an indirect bandgap(E_(g)=1.89 eV).By contrast,the bandgaps of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.73 eV,1.61 eV,and 1.75 eV,respectively.Moreover,the work function of MoSi_(2)N_(4) monolayer(4.80 eV)is significantly reduced after the adsorption of alkali metal atoms.The work functions of one Li-,Na-,and K-adsorbed MoSi_(2)N_(4) monolayer are 1.50 eV,1.43 eV,and 2.03 eV,respectively.Then,optical investigations indicate that alkali metal adsorption processes substantially increase the visible light absorption range and coefficient of MoSi_(2)N_(4) monolayer.Furthermore,based on redox potential variations after alkali metals are adsorbed,Li-and Na-adsorbed MoSi_(2)N_(4) monolayers are more suitable for the water splitting photocatalytic process,and the Li-adsorbed case shows the highest potential application for CO_(2) reduction.In conclusion,alkali-metal-adsorbed MoSi_(2)N_(4) monolayer exhibits promising applications as novel optoelectronic devices and photocatalytic materials due to its unique physical and chemical properties.Zhiyuan Sun Jing Xu Nsajigwa Mwankemwa Wenxing Yang Xianwen Wu Zao Yi Shanjun Chen Weibin Zhang 2022Communications in Theoretical Physics2022,74,1:1
6Transactivation of rat apical sodium-dependent bile acid transporter and increased bile acid transport by 1,25-Dihydroxyvitamin D3 via the vitamin D receptor显示文摘Xianghai Chen Frank Chen Shanjun Liu 2006Mol Pharmacol2006,69,6:1
7Studies on the phase separation of polyetherimide - modified epoxy resin, 2: Effect of molecular weight of PE1 on the structure formation显示文摘Jun Cui Wenjie Chen Shanjun Li 1997Macromolecular Chemistry and Physics1997,198,10:1
8A scalable cyberinfrastructure and cloud computing platform for forest aboveground biomass estimation based on the Google Earth Engine显示文摘Earth observation(EO)data,such as high-resolution satellite imagery or LiDAR,has become one primary source for forests Aboveground Biomass(AGB)mapping and estimation.However,managing and analyzing the large amount of globally or locally available EO data remains a great challenge.The Google Earth Engine(GEE),which leverages cloud-computing services to provide powerful capabilities on the management and rapid analysis of various types of EO data,has appeared as an inestimable tool to address this challenge.In this paper,we present a scalable cyberinfrastructure for on-the-fly AGB estimation,statistics,and visualization over a large spatial extent.This cyberinfrastructure integrates state-of-the-art cloud computing applications,including GEE,Fusion Tables,and the Google Cloud Platform(GCP),to establish a scalable,highly extendable,and highperformance analysis environment.Two experiments were designed to demonstrate its superiority in performance over the traditional desktop environment and its scalability in processing complex workflows.In addition,a web portal was developed to integrate the cyberinfrastructure with some visualization tools(e.g.Google Maps,Highcharts)to provide a Graphical User Interfaces(GUI)and online visualization for both general public and geospatial researchers.Zelong Yang Wenwen Li Qi Chen Sheng Wu Shanjun Liu Jianya Gong 2019International Journal of Digital Earth2019,12,9:1
9Prediction of Newhall navel orange internal quality based on digital microscopy显示文摘The traditional technology for internal quality detection of citrus fruit is believed to be destructive,inefficient,and error-prone.To address these issues,a novel method has been developed to evaluate nondestructively the sugar-acid ratio(SAR)of soluble solids by using the oil glands density(OGD).In this study,a total of 584 samples with different widths were collected.The sample data were correlated that the SAR and OGD decreased with time during storage.The relevance with time was significant between SAR and OGD of citrus positively correlated in the calibration group(R2=0.82),which indicated that OGD could be used to predict the internal quality of citrus.It indicated that a new generation of digital microscopy could provide an alternative to predict nondestructively the internal quality of citrus fruit,as well as some theoretical insight for further studies of online quality detection in the future.Shumin Gao Cong Cao Dingyi Hu Rangwei Xu Yunjiang Cheng Hong Chen Ming Zhu Shanjun Li 2021International Journal of Agricultural and Biological Engineering2021,14,6:0
10Towards the selectivity distinction of phenol hydrogenation on noble metal catalysts显示文摘Selective hydrogenation of phenol to cyclohexanone is intriguing in chemical industry.Though a few catalysts with promising performances have been developed in recent years,the basic principle for catalyst design is still missing owing to the unclear catalytic mechanism.This work tries to unravel the mechanism of phenol hydro-genation and the reasons causing the selectivity discrepancy on noble metal catalysts under mild conditions.Results show that different reaction pathways always firstly converge to the formation of cyclohexanone under mild conditions.The selectivity discrepancy mainly depends on the activity for cyclohexanone sequential hy-drogenation,in which two factors are found to be responsible,i.e.the hydrogenation energy barrier and the competitive chemisorption between phenol and cyclohexanone,if the specific co-catalyzing effect of H 2 O on Ru is not considered.Based on the above results,a quantitative descriptor,E b(one/pl)/E a,in which E a can be further correlated to the d band center of the noble metal catalyst,is proposed by the first time to roughly evaluate and predict the selectivity to cyclohexanone for catalyst screening.Shanjun Mao Zhe Wang Zhirong Chen Kejun Wu Kaichao Zhang Qichuan Li Huihuan Yan Guofeng Lü Guodong Huang Yong Wang 2023Nano Materials Science2023,5,1:0
11Highly performed platinum nanosheets synthesized under in situ reaction conditions for hydrogen generation显示文摘Surface properties of a catalyst, especially exposed crystal facets and coordination states, directly affect the catalyst's performance. Herein, we illustrate how reaction conditions direct the fabrication of a wellbehaved catalyst with desired structures in the case of hydrogen evolution reaction(HER). Stable adsorbed PtClxions on CNTs are in situ electrochemically reduced into a unique Pt nanosheet structure enclosed by high-index(311) and low-index(200) and(111) facets during HER process. Experimental results and density functional theory(DFT) calculation disclose the function mechanism between these unique structures and reactants. The adsorbed H2 O and reactive species act as capping agents protecting the(311) facet where the dissociation of water molecule is promoted, and the produced H*intermediates favorably combine and release on the nearby low-index Pt sites. The joint collaborations of these active sites afford Pt nanosheets comparable activity to 20 wt% Pt/C and a 12.7-fold over mass activity. These findings provide novel insight into the synthesis of heterogeneous catalysts with high specificity.Xiaobing Bao Yutong Gong Xiaozhong Zheng Jiayi Chen Shanjun Mao Yong Wang 2020Journal of Energy Chemistry2020,29,12:0
12Oral administration of Bacillus coagulans TQ-35 alleviates allergic responses in OVA-sensitive BALB/c mice显示文摘Bacillus coagulans has been extensively studied so far,but there has been a lack of research on its usage in allergy.In this study,we designed to assess the effect of different concentrations of B.coagulans on food allergy in a BALB/c mouse model of ovalbumin(OVA)-induced food allergy and its effect on gut microbes.The assessment of symptoms,specific immunoglobulin E(IgE),T-cell differentiation,and related gene expression levels in sensitized mice by assay indicated that high doses of oral B.coagulans could alleviate allergic symptoms.Treatment with B.coagulans,in the high-dose group,significantly reduced IgE and IgG1 levels and modulated the balance of T helper type 1 cell(Th1)and Th2 and the expression of relevant genes in the spleen.16S rRNA analysis showed that probiotics improved the structure of the microbiota,in particular by boosting the percentage of Clostridia,Bacteroides vulgatus and Enterococcus faecium,and by increasing the abundance of microbial species,thereby modulating the immune system.Therefore,this study can provide insights into the practical application of B.coagulans doses to alleviate OVA allergy.Yifan Wang Shanjun Chen Chong Wang Yi Zhang Hongliang Zeng Linglin Fu Yanbo Wang 2024Food Science and Human Wellness2024,13,3:0
13Highly efficient and anti-poisoning single-atom cobalt catalyst for selective hydrogenation of nitroarenes显示文摘Developing non-precious metal catalysts to selectively reduce functionalized nitroarenes with high efficiency is urgently desirable for the production of value-added amines.Herein,we report a novel,efficient,anti-poisoning single-atom cobalt catalyst(Co-NAC)for the highly selective hydrogenation of the nitro to amino group for nitroarenes baring various functional groups,including vinyl,cyano,and halogen.Using a combination of structure characterization techniques,we have confirmed that the cobalt species are predominantly present in the form of four-coordinated Co single sites anchored on nitrogen-assembly carbon(NAC)as the ordered mesoporous support.Co-NAC catalysts enable the full conversion and>99%selectivity with molecular H2 as a green reductant under mild conditions(80℃,2 MPa H2).As for the selective hydrogenation of 3-nitrostyrene,Co-NAC catalyst affords high catalytic productivity(19.7 h-1),which is superior to the cobalt nanoparticles(NPs)catalysts and most of the recently reported Co-based catalysts.This is attributed to the highly accessible atomically-dispersed Co active sites,the high surface area with ordered-mesoporous morphology and the prominent high content of nitrogen dopants.Notably,Co-NAC catalyst displays resistance towards sulfur-containing poisons(20 equivalents)and strong non-oxidizing acid(8 M),showing great potential for continuous application in the chemical industry.Yuemin Lin Renfeng Nie Yuting Li Xun Wu Jiaqi Yu Shaohua Xie Yajing Shen Shanjun Mao Yuzhuo Chen Dan Lu Zongbi Bao Qiwei Yang Qilong Ren Yiwen Yang Fudong Liu Long Qi Wenyu Huang Zhiguo Zhang 2022Nano Research2022,15,12:0
14Fundamental aspects of alkyne semi-hydrogenation over heterogeneous catalysts显示文摘Alkyne semi-hydrogenation is extremely significant for the production of polymer-grade ethylene and lots of fine chemicals in modem industry.Many efforts had been devoted to regulate the electronic and geometric structure of active ensembles for suppressing side reactions,including over-hydrogenation and oligomerization.Several strategies,such as alloying,surface decoration,atomization of metal centers,and others,were developed to promote the selective production of target alkenes in alkyne hydrogenation.In this review,the basic principles within reaction mechanisms and catalyst optimization would be discussed in detail.And an updated perspective to the fabrication of next-generation catalysts for alkyne semi-hydrogenation is also provided.Zhe Wang Qian Luo Shanjun Mao Chunpeng Wang Jinqi Xiong Zhirong Chen Yong Wang 2022Nano Research2022,15,12:0
15Decoupling gene functions from knockout effects by evolutionary analyses显示文摘Genic functions have long been confounded by pleiotropic mutational effects.To understand such genetic effects,we examine HAP4,a well-studied transcription factor in Saccharomyces cerevisiae that functions by forming a tetramer with HAP2,HAP3 and HAP5.Deletion of HAP4 results in highly pleiotropic gene expression responses,some of which are clustered in related cellular processes(clustered effects)while most are distributed randomly across diverse cellular processes(distributed effects).Strikingly,the distributed effects that account for much of HAP4 pleiotropy tend to be non-heritable in a population,suggesting they have few evolutionary consequences.Indeed,these effects are poorly conserved in closely related yeasts.We further show substantial overlaps of clustered effects,but not distributed effects,among the four genes encoding the HAP2/3/4/5 tetramer.This pattern holds for other biochemically characterized yeast protein complexes or metabolic pathways.Examination of a set of cell morphological traits of the deletion lines yields consistent results.Hence,only some deletion effects of a gene support related biochemical understandings with the rest being often pleiotropic and evolutionarily decoupled from the gene’s normal functions.This study suggests a new framework for reverse genetic analysis.Li Liu Mengdi Liu Di Zhang Shanjun Deng Piaopiao Chen Jing Yang Yunhan Xie Xionglei He 2020National Science Review2020,7,7:0
16Reversible Data Hiding in Encrypted Images Based on Prediction and Adaptive Classification Scrambling显示文摘Reversible data hiding in encrypted images(RDH-EI)technology is widely used in cloud storage for image privacy protection.In order to improve the embedding capacity of the RDH-EI algorithm and the security of the encrypted images,we proposed a reversible data hiding algorithm for encrypted images based on prediction and adaptive classification scrambling.First,the prediction error image is obtained by a novel prediction method before encryption.Then,the image pixel values are divided into two categories by the threshold range,which is selected adaptively according to the image content.Multiple high-significant bits of pixels within the threshold range are used for embedding data and pixel values outside the threshold range remain unchanged.The optimal threshold selected adaptively ensures the maximum embedding capacity of the algorithm.Moreover,the security of encrypted images can be improved by the combination of XOR encryption and classification scrambling encryption since the embedded data is independent of the pixel position.Experiment results demonstrate that the proposed method has higher embedding capacity compared with the current state-of-the-art methods for images with different texture complexity.Lingfeng Qu Hongjie He Shanjun Zhang Fan Chen 2020Computers, Materials & Continua2020,,12:0
17Design and Experiments of a Human-Leg-Inspired Omnidirectional Robotic Leg显示文摘Bionic-based robotic legs enable the legged robots with elegant and agile mobility in multi-terrain environment,just like natural living beings.And the smart design could efficiently improve the performance of a robotic leg.Inspired by the simplified human leg structure,we present a 3-DOF robotic leg—OmniLeg,that is capable of making omnidirectional legged locomotion while keeping constant posture of the foot.Additionally,the concentrated drive mode,in which all the motor actuators are installed in the torso and do not move with the leg,minimizes the inertia of the robotic leg.In this paper,the modular design,the kinematics model,the structural analysis,the workspace,and the performance evaluation of the OmniLeg are discussed.Furthermore,we build a prototype based on the proposed design,and the precision of it is verified by the error calibration experiment which is conducted by tracking the trajectory of the prototype’s endpoint.Then,we present an OmniLeg-based single legged mobile robot.The capability of omnidirectional legged locomotion of the OmniLeg is demonstrated by the experiments.Yuze Xu Zirong Luo Xiangjuan Bai Huixiang Xie Yiming Zhu Shanjun Chen Jianzhong Shang 2023Journal of Bionic Engineering2023,20,6:0
18Numerical Analysis of Cold-Formed Thin-Walled Steel Short Columns with Pitting Corrosion during Bridge Construction显示文摘Pitting corrosion is harmful during bridge construction,which will lead to uneven roughness of steel surfaces and reduce the thickness of steel.Hence,the effect of pitting corrosion on the mechanical properties of cold-formed thin-walled steel stub columns is studied,and the empirical formulas are established through regression fitting to predict the ultimate load of web and flange under pitting corrosion.In detail,the failure modes and load-displacement curves of specimens with different locations,area ratios,and depths are obtained through a large number of non-linear finite element analysis.As for the specimens with pitting corrosion on the web,all the specimens are subject to local buckling failure,and the failure mode will not change with pitting corrosion,but the failure location will change with pitting corrosion location;the size,location,and area ratio of pitting corrosion have little influence on the ultimate load of cold-formed thin-walled steel short columns,but the loss rate of pitting corrosion section area has a greater impact on the ultimate bearing capacity.As for the specimen with flange pitting corrosion,the location and area ratio of pitting corrosion have less influence on the ultimate load of cold-formed thin-walled steel short columns,and the section area loss rate has greater influence on the ultimate bearing capacity;the impact of web pitting corrosion on the ultimate load is greater than that of flange pitting corrosion under the same condition of pitting corrosion section area.The prediction formulas of limit load which are suitable for pitting corrosion of web and flange are established,which can provide a reference for performance evaluation of corroded cold-formed thin-walled steel.Hongzhang Wang Jing Guo Shanjun Yang Chaoheng Cheng Jing Chen Zhihao Chen 2024Structural Durability & Health Monitoring2024,18,2:0
19Effect of GW8 Gene Editing on Appearance Quality of Erect-Panicle Type (dep1) Japonica Rice显示文摘Most high-yielding japonica rice varieties in China carry dep1,a multi-effective regulator of plant architecture and grain shape,resulting in erect panicle with short and round grain shape.However,its appearance quality needs to be improved since long-grain rice is favored by the market.GW8 is a dominant gene regulating grain shape,and its loss-of-function genotype leads to elongated grains with a better quality in appearance.MAO Ting CHEN Hongfa LI Xin LIU Yan ZHONG Shuncheng WANG Shiyu ZHAO Yizhou ZHANG Zhan NI Shanjun HUANG He LI Xu HU Shikai 2023Rice science2023,30,5:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费