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Recent progress of in situ/operando characterization techniques for electrocatalytic energy conversion reaction

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Chinese Chemical Letters 2024年第9期35卷 92-101页

作者： Zhao Li Huimin Yang wenjing cheng Lin Tian School of Materials and Chemical Engineering Xuzhou University of TechnologyXuzhou 221018China University and College Key Lab of Natural Product Chemistry and Application in Xinjiang School of Chemistry and Environmental ScienceYili Normal UniversityYining 835000China

Catalysts can significantly promote the reaction dynamics and are therefore considered crucial components for achieving high electrochemical energy conversion ***,the active sites of the catalysts,particularly for nano-level and atomic-level catalysts commonly undergo reconstruction under practical ***,obtaining an in-depth and systematic understanding on the real active sites through in situ/operando characterization techniques is a prerequisite for establishing the structureperformance relationship and guiding the future design of more efficient ***,we summarize the recent progress of in situ/operando characterization techniques for identifying the nature of active sites of electrocatalysts when used in electrocatalytic energy conversion ***,our focus lies in the fundamental principles of various in situ/operando characterization techniques,with particular emphasis on their applications for electrocatalytic *** that,the challenges and perspective insights are also added in the final section to highlight the future direction of this important field.

关键词： In situ techniques Electrocatalysis Active sites Energy conversion

Agricultural Vulnerability to Drought in China's Agro-pastoral Ecotone:A Case Study of Yulin City,Shaanxi Province

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Chinese Geographical Science 2023年第5期33卷 934-945页

作者： LI Yuheng cheng wenjing ZUO Wenjie ZHANG Lingyue Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of the Chinese Academy of SciencesBeijing 100049China College of Public Administration and Law Northeast Agricultural UniversityHarbin 150030China College of Economics and Management Northwest A&F UniversityYangling 712100China

Agro-pastoral ecotone of northern China is the prominent area for agricultural production,but it is also the most typical ecological fragile area with frequent drought *** Yulin City at Shaanxi Province in China as the case area,the paper aims to investigate the spatio-temporal changes of agricultural vulnerability to drought in China’s agro-pastoral ecotone in the period 2000 *** results show that:1)the agricultural vulnerability to drought in Yulin City has shifted from high vulnerability in the period2000–2010 to low vulnerability in the period 2011–2020.2)There exist obvious spatio-temporal differences of the agricultural vulnerability to drought in Yulin City during the research period.3)Four sensitive events and 14 resilient events were identified in the research and the crops of Yulin had become more resilient to ***,the paper put forward with policy implications to make adaptive strategies of agriculture to climate change in China’s agro-pastoral ecotone in the future,e.g.,carrying out agricultural zoning based on agricultural production conditions,intensifying the construction of disaster prevention and relief system,and integrating with modern agricultural technology to develop new type agriculture.

关键词： climate change agricultural vulnerability drought agro-pastoral ecotone Yulin City,China

Synthesis of Submicrometer-sized Sn-MCM-41 Particles and Their Catalytic Performance in Baeyer-ViUiger Oxidation

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Chemical Research in Chinese Universities 2015年第1期31卷 138-143页

作者： CHEN Na JIANG Yanqiu cheng wenjing LIN Kaifeng XU Xianzhu State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 P. R. China Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology Harbin 150080 P. R. China

Submicrometer-sized tin-containing MCM-41 particles with a size of several hundred nanometers（Sn-MCM-41/SMPs） were rapidly prepared with tin chloride as tin source and tetraethyl orthosilicate as silicon source via a dilute solution route in sodium hydroxide medium at room temperature. The characterization results show the highly ordered hexagonal mesopores and tetrahedral Sn species in Sn-MCM-41/SMPs. The material proved to be active and selective for Baeyer-Villiger oxidation of adamantanone with aqueous H2O2. Notably, Sn-MCM-41/ SMPs displayed a higher initial reaction rate and turnover number（TON） than common micrometer-sized Sn-MCM-41 large particles（Sn-MCM-41/LPs）, mainly attributed to the accelerated diffusion of the reactants and enhanced accessibility to the catalytic Sn species via shorter mesopore channels in Sn-MCM-41/SMPs. Furthermore, Sn-MCM-41/SMPs could be reused without the loss of activity after five runs, indicating that Sn active sites in the submicrometer-sized particles are remarkably stable. The study shows that decreasing particle size of Sn-MCM-41 in submicrometer scale is an effective way to achieve catalysts for Baeyer-Villiger oxidations with improved catalytic performance.

关键词： Sn-MCM-41 Submicrometer-sized particle Shorter mesopore channel Baeyer-Villiger oxidation

Mesoporous TiO_2/Carbon Beads: One-Pot Preparation and Their Application in Visible-Light-Induced Photodegradation

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Nano-Micro Letters 2015年第3期7卷 243-254页

作者： Xiaowei Li Yanqiu Jiang wenjing cheng Yudong Li Xianzhu Xu Kaifeng Lin Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology

Mesoporous Ti O2/Carbon beads have been prepared via a facile impregnation-carbonization approach, in which a porous anion-exchange resin and K2 Ti O(C2O4)2were used as hard carbon and titanium source, *** results reveal that the self-assembled composites have disordered mesostructure, uniform mesopores,large pore volumes, and high surface areas. The mesopore walls are composed of amorphous carbon, well-dispersed and confined anatase or rutile nanoparticles. Some anatase phase of Ti O2 was transformed to rutile phase via an increase of carbonization temperature or repeated impregnation of the resin with Ti O(C2O4)22-species. X-ray photoelectron spectroscopy, carbon, hydrogen, and nitrogen element analysis, and thermal gravity analysis results indicate the doping of carbon into the Ti O2 lattice and strong interaction between carbon and Ti O2 nanoparticles. A synergy effect by carbon and Ti O2 in the composites has been discussed herein on the degradation of methyl orange under visible light. The dye removal process involves adsorption of the dye from water by the mesopores in the composites, followed by photodegradation on the separated dye-loaded catalysts. Mesopores allow full access of the dye molecules to the surface of Ti O2 ***, the bead format of such composite enables their straightforward separation from the reaction mixture in their application as a liquid-phase heterogeneous photodegradation catalyst.

关键词： Ti O2nanoparticles Mesoporous carbon Composite bead Visible light Easy separation

Paraventricular Nucleus P2X7 Receptors Aggravate Acute Myocardial Infarction Injury via ROS-Induced Vasopressin-V1b Activation in Rats

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Neuroscience Bulletin 2021年第5期37卷 641-656页

作者： wenjing cheng Yinggang Sun Qin Wu Kokwin Ooi Yi Feng Chunmei Xia Danian Zhu Department of Physiology and Pathophysiology School of Basic Medical SciencesFudan UniversityShanghai 200032China Department of Cardiovascular Diseases Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Medical Technology Jiangsu Vocational College of MedicineYancheng 224005China Department of Integrative Medicine and Neurobiology School of Basic Medical SciencesFudan UniversityShanghai 200032China

The present study was designed to investigate the mechanisms by which P2X7 receptors(P2X7Rs)mediate the activation of vasopressinergic neurons thereby increasing sympathetic hyperactivity in the paraventricular nucleus(PVN) of the hypothalamus of rats with acute myocardial ischemia(AMI). The left anterior descending branch of the coronary artery was ligated to induce AMI in rats. The rats were pretreated with BBG(brilliant blue G, a P2X7R antagonist), nelivaptan(a vasopressin V1b receptor antagonist), or diphenyleneiodonium(DPI) [an nicotinamide adenine dinucleotide phosphate(NADPH)oxidase inhibitor]. Hemodynamic parameters of the heart were monitored. Myocardial injury and cardiomyocyte apoptosis were assessed. In the PVN of AMI rats, P2X7R mediated microglial activation, while reactive oxygen species(ROS) and NADPH oxidase 2(NOX2) were higher than in the sham group. Intraperitoneal injection of BBG effectively reduced ROS production and vasopressin expression in the PVN of AMI rats. Moreover, both BBG and DPI pretreatment effectively reduced sympathetic hyperactivity and ameliorated AMI injury, as represented by reduced inflammation and apoptosis of ***, microinjection of nelivaptan into the PVN improved cardiac function and reduced the norepinephrine(AE) levels in AMI rats. Collectively, the results suggest that, within the PVN of AMI rats, P2X7R upregulation mediates microglial activation and the overproduction of ROS, which in turn activates vasopressinergic neuron V1b receptors and sympathetic hyperactivity, hence aggravating myocardial injury in the AMI setting.

关键词： PVN P2X7 receptor Vasopressin Reactive oxygen species c-fos Myocardial ischemia

Identification and validation of novel prognostic fatty acid metabolic gene signatures in colon adenocarcinoma through systematic approaches

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Oncology Research 2024年第2期32卷 297-308页

作者： HENG ZHANG wenjing cheng HAIBO ZHAO WEIDONG CHEN QIUJIE ZHANG QING-QING YU Department of Laboratory Shandong Daizhuang HospitalJining272051China Jining No.1 People’s Hospital Shandong First Medical UniversityJining272000China

Colorectal cancer(CRC)belongs to the class of significantly malignant tumors found in ***,dysregulated fatty acid metabolism(FAM)has been a topic of attention due to its modulation in cancer,specifically ***,the regulatory FAM pathways in CRC require comprehensive ***:The clinical and gene expression data of 175 fatty acid metabolic genes(FAMGs)linked with colon adenocarcinoma(COAD)and normal cornerstone genes were gathered through The Cancer Genome Atlas(TCGA)-COAD corroborating with the Molecular Signature Database v7.2(MSigDB).Initially,crucial prognostic genes were selected by uni-and multi-variate Cox proportional regression analyses;then,depending upon these identified signature genes and clinical variables,a nomogram was ***,to assess tumor immune characteristics,concomitant evaluation of tumor immune evasion/risk scoring were ***:A 8-gene signature,including ACBD4,ACOX1,CD36,CPT2,ELOVL3,ELOVL6,ENO3,and SUCLG2,was generated,and depending upon this,CRC patients were categorized within high-risk(H-R)and low-risk(L-R)***,risk and age-based nomograms indicated moderate discrimination and good *** data confirmed that the 8-gene model efficiently predicted CRC patients’***,according to the conjoint analysis of tumor immune evasion and the risk scorings,the H-R cohort had an immunosuppressive tumor microenvironment,which caused a substandard ***:This investigation established a FAMGs-based prognostic model with substantially high predictive value,providing the possibility for improved individualized treatment for CRC individuals.

关键词： Fatty acid metabolism Colorectal cancer Gene signatures Machine learning

Advances in pharmacological effects of tanshinone ⅡA on pain

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中国药理学与毒理学杂志 2023年第7期37卷 524-525页

作者： cheng wenjing CHEN Xi ZHANG Danshen JING Yongshuai College of Chemistry and Pharmaceutical Engineering Hebei University of Science and Technology

Pain is one of the most serious problems plaguing human health today. Drug therapy is one of the main ways to treat pain in clinic. The analgesic drugs commonly used in clinical treatment of pain are often accompanied by many side effects, the analgesic effect is still not ideal. Salvia miltiorrhiza is a traditional medicinal material with the same origin as food and medicine. It has the functions of promoting blood circulation and removing blood stasis, relieving pain through menstrual circulation, and contains many effective ingredients such as tanshinone and salvianolic acid. Tanshinone is a kind of rosin diterpenoid compound, which mainly consists of o-quinone type and p-quinone type parent nucleus, and tanshinone Ⅱ A is the representative compound. The pharmacological mechanism of tanshinone Ⅱ A in labor pain mainly includes:(1) Regulate inflammatory *** cytokines played an important role in the occurrence and progression of pain. It was found that the analgesic effect of tanshinone ⅡA was related to the antiinflammatory effect. Tanshinone Ⅱ A showed anti-injurious activity in various pain models, such as bone cancer pain and sciatic nerve ligation, and related studies found that tanshinone Ⅱ A could inhibit the expression of inflammatory factors TNF-α, IL-1β and IL-6 in the spinal cord of model rats. In the spinal nerve ligation model,tanshinone ⅡA also promoted the release of anti-inflammatory cytokine IL-10 in the spinal cord of rats.(2) Regulate signal pathways related to regulating spinal cord oxidation and apoptosis. Apoptosis and oxidation played an important role in the process of pain. When nerve injury was caused by stimulation, oxidative stress and apoptosis of nerve cells were involved in the mechanism of hyperalgesia. Tanshinone Ⅱ A sodium sulfonate could relieve pain by regulating apoptosis-related pathways. In neuralgia model, tanshinone ⅡA could reduce the apoptosis of spinal cord neurons by inhibiting oxidative stress response

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Simulating the resonance-mediated(1+2)-three-photon absorption enhancement in Pr3+ions by a rectangle phase modulation

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Chinese Physics B 2022年第6期31卷 285-290页

作者： wenjing cheng Yuan Li Hongzhen Qiao Meng Wang Shaoshuo Ma Fangjie Shu Chuanqi Xie and Guo Liang Henan Province Engineering Research Center of Microcavity and Photoelectric Intelligent Sensing School of Electronics and Electrical EngineeringShangqiu Normal UniversityShangqiu 476000China Department of Ophthalmology First People’s Hospital of ShangqiuShangqiu 476000China The Key Laboratory of Weak Light Nonlinear Photonics Nankai University of Ministry of Education Tianjin 300457China

Enhancing the upconversion luminescence of rare earth ions is crucial for their applications in the laser sources,fiber optic communications,color displays,biolabeling,and biomedical *** this paper,we theoretically study the resonance-mediated(1+2)-three-photon absorption in Pr^(3+) ions by a rectangle phase *** results show that the resonance-mediated(1+2)-three-photon absorption can be effectively enhanced by properly designing the depth and width of the rectangle phase modulation,which can be attributed to the constructive interference between on-resonant and near-resonant three-photon excitation ***,the enhancement efficiency of resonance-mediated(1+2)-threephoton absorption can be affected by the pulse width(or spectral bandwidth)of femtosecond laser field,final state transition frequency,and absorption *** research can provide a clear physical picture for understanding and controlling the multi-photon absorption in rare-earth ions,and also can provide theoretical guidance for improving the up-conversion luminescence.

关键词： coherent quantum control femtosecond pulse shaping three-photon absorption rare-earth ions

Weighted Wavelet Estimate in Semiparametric Models with Heteroscedastic Errors

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Weighted Wavelet Estimate in Semiparametric Models with Hete...