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Partial Oxidation of Methane Over the Perovskite Oxides

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Chinese Chemical Letters 2001年第11期12卷 975-978页

作者： chu, WL tong, JH Yang, WS Lin, LW Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Ti0.2O3-delta oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.

关键词： methane oxidation Ba0.5Sr0.5Co0.8Fe0.2O3-delta Ba0.5Sr0.5Co0.8Ti0.2O3-delta perovskite

Mechanical property and anisotropy of as-extruded Mg-Zn-Y-Mn alloys with different volume fraction of long-period stacking ordered(LPSO) phase

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Journal of Rare Earths 2024年第12期42卷 2259-2269页

作者： Dahui Liang Mincong Chen chuanqiang Li Zhipei tong Yong dong dong Bian School of Materials and Energy Guangdong University of Technology Medical Research Institute Department of Orthopedics Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences) Southern Medical University

Effects of different volume fraction of long-period stacking ordered(LPSO) phase on the microstructure,mechanical property and anisotropy of the as-extruded Mg-xZn-yY-0.1Mn(x = 1 wt%, 2 wt%, 4 wt% and y = 2 wt%, 4 wt%, 8 wt%) alloys were studied by an optical microscope, a scanning electron microscope,texture analysis, a transmission electron microscope and tensile testing. The results reveal that the volume fraction of LPSO phase increases from ZW12 to ZW24 to ZW48 alloys with the elevating Zn and Y content but constant Y/Zn value, and the mechanical strength of the LPSO-containing Mg-Zn-Y-Mn system is gradually improved when increasing LPSO phases. With the highest volume fraction of LPSO phase, ZW48 alloy presents the highest ultimate tensile strength(UTS) of 427 MPa along the extrusion direction(ED) when compared with those of ZW12 alloy with the UTS of 307 MPa and ZW24 alloy with the UTS of 347 MPa. Moreover, the elongation ratio of ZW48 alloy is maintained to moderate 9.9%, which is also the highest among three studied alloys. On the other hand, texture analysis demonstrates that the basal texture of the a-Mg phase in the ZW48 alloy is significantly weakened by the generation of more LPSO phases. On the contrary, a high texture intensity of a-Mg phase and obvious mechanical anisotropy can be observed for the ZW12 alloy. However, mechanical anisotropy still exists in the ZW48 alloy containing massive LPSO phases, which is attributed primarily to the zonal distribution of large LPSO along the ED.

关键词： Microstructure Mg-Zn-Y-Mn alloy LPSO phase Texture Mechanical anisotropy Rare earths

Miniaturized time-of-flight neutron spin flipper using a high-TC superconductor

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Nuclear Science and Techniques 2022年第11期33卷 113-119页

作者： Yu-Chen dong Tian-Hao Wang Wolfgang Kreuzpaintner Xiao-Tao Liu Ze-Hui Li Yu-dong Kang Jun-Pei Zhang Long Tian chu-Yi Huang Bo Bai Xin tong Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Guangzhou Institute of Technology Xidian UniversityGuangzhou 510555China

A miniaturized neutron spin flipper based on a high-TC superconductor film,developed at the China Spallation Neutron Source(CSNS),is presented.A neutron spin flipper is an essential component for performing polarized neutron experiments and,as such,constitutes a high priority for developing CSNS’s polarized neutron *** provide the beamlines with a universal neutron spin flipper operating over a wide wavelength band,the neutron spin flipper utilizes non-adiabatic spin flipping during transit through opposite magnetic fields that are mutually shielded by the superconductor Meissner effect.A compact vacuum heat shield and a low-power consumption sterling refrigerator maintained the superconducting condition while reducing the size and power input of the *** prototype device was tested at the CSNS BL-20,which demonstrated a flipping efficiency of 99%at 4 A°.

关键词： Neutron Superconductor Scattering Spinflipper

Polysaccharides in Sipunculus nudus: Extraction Condition Optimization and Antioxidant Activities

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Journal of Ocean University of China 2017年第1期16卷 74-80页

作者： ZHANG Qin dong Lanfang tong tong WANG Qingchao XU Mingzhu Key Laboratory of Marine Biotechnology of Guangxi Guangxi Institute of Oceanology Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education) Ocean University of China

Marine organisms constitute unlimited resource of bioactive substances due to their high biodiversity and represent a valuable source of new compounds. This study optimized the alkali-extraction conditions and antioxidant activities of soluble polysaccharides from the body wall of Sipunculus nudus. The effects of solid-liquid ratio, extraction duration, extraction temperature, and alkali concentration on the yield of S. nudus polysaccharides(SNP) were examined, according to which the optimal combination of extraction parameters was obtained by an orthogonal test. The relative influencing importance of different extraction parameters on the yield of SNP followed the order as solid-liquid ratio > extraction temperature > alkali concentration > extraction duration. The highest extraction yield, 1.98%, was achieved under an optimal extraction condition: temperature 60℃, solid-liquid ratio 1:6 g mL^(-1), duration 5 h, and alkali(Na OH) mass fraction 6%. The in vitro antioxidant activities examination showed that extracted SNP under this optimized condition had strong power in reducing certain hydroxyl and superoxide radical scavenging abilities. The promising results showed that extracted SNP could be a potent natural antioxidant.

关键词： Sipunculus nudus polysaccharide extraction condition antioxidant activities

Targeting Erbin in B cells for therapy of lung metastasis of colorectal cancer

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Signal Transduction and Targeted Therapy 2021年第4期6卷 1302-1319页

作者： tong Shen Jing-Lin Liu chu-Yi Wang Youlutuziayi Rixiati Shi Li Ling-dong Cai Yuan-Yuan Zhao Jian-Ming Li Department of Pathology Soochow University Medical SchoolSuzhouChina Department of Pathology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhouChina

The mechanisms and key factors involved in tumor environments for lung metastasis of CRC are still ***,using clinical samples from lung metastases of CRC patients,we found that intestinal immune network for IgA production was significantly dysregulated in lung metastases of ***-cell RNA sequencing discovered a subtype of B cells positive for Erbin,one member of the leucine-rich repeat and PDZ domain(LAP)family,was involved in the lung *** deletion in B cells suppressed lung metastasis of CRC in ***,deletion of Erbin in B cells enhanced the killing effects of CD8+T cells on tumor ***,Erbin knockout attenuated TGFp-mediated suppression of migration of CXCR5+lgA+cells and STAT6-mediated PD1 *** study uncovered a key role of Erbin in regulating PD1+lgA+B cells in lung metastasis of *** Erbin as well as combined use of neutralizing B cells and antibodies neutralizing PD1 suppresses lung metastasis of CRC in mice,suggesting the potential option for treatment of lung metastasis of CRC.

关键词： PD1 metastasis lung

Application Research on Hydraulic Coke Cutting Monitoring System Based on Optical Fiber Sensing Technology

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Photonic Sensors 2014年第2期4卷 147-151页

作者： dong ZHONG Xinglin tong Key Laboratory of Fiber Optic Sensing Technology and Information Processing Wuhan University of TechnologyWuhan 430070 China Department of Electronic and Information Hubei University of Science and Technology Xianning 43 7100 China

With the development of the optical fiber sensing technology, the acoustic emission sensor has become one of the focal research topics. On the basis of studying the traditional hydraulic coke cutting monitoring system, the optical fiber acoustic emission sensor has been applied in the hydraulic coke cutting monitoring system for the first time, researching the monitoring signal of the optical fiber acoustic emission sensor in the system. The actual test results show that using the acoustic emission sensor in the hydraulic coke cutting monitoring system can get the real-time and accurate hydraulic coke cutting state and the effective realization of hydraulic coke cutting automatic monitoring in the Wuhan Branch of Sinopec.

关键词： Acoustic emission sensing hydraulic coke cutting monitoring system signal

A New Strategy for Restraining Dynamic Strain Aging in GH4169 Alloy During Tensile Deformation at High Temperature

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1895-1902页

作者： Xin-tong Lian Jin-Lan An Lei Wang Han dong School of Materials Scienceand Engineering Shanghai UniversityShanghai 200444China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China Key Lab for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The dynamic strain aging(DSA) behavior was investigated in GH4169 alloy during tensile deforming with electric-pulse current(EPC) at 750 ℃.The results show that DSA is restrained in the alloy when deformed with 40 *** size ofγ " phase inner grains increases obviously and δ phase is facilitated to precipitate on grain boundary in the alloy applied with EPC,due to the promotion effect of EPC on the diffusion and segregation of *** electron microscopy(TEM)results indicate that dislocations can cut through small γ" precipitate with the size of less than 10 nm,while dislocations can only bypass dislocations when γ " precipitate grow up over 20 *** growth of precipitates consumes large amounts of atoms as well as the velocity of dislocation increase,which makes dislocations difficult to be ***,when γ" precipitates grow up to a large size more than the critical size of dislocation pinning,DSA is significantly restrained in the alloy after necking deformed with EPC.

关键词： GH4169 alloy Electric-pulse current Dynamic strain aging Microstructure

Review of Mathematical Methodology for Electric Power Optimization Problems

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Journal of the Operations Research Society of China 2020年第2期8卷 295-309页

作者： dong Han Xiao-Jiao tong Department of Electrical Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Mathematics and Computational Science Hunan First Normal UniversityChangsha 410205China

Electric power system is a physical energy system consisting of power generation,substations,transmission,distribution,and *** objective of power system optimization is to improve power system security,economy,and *** paper summarizes the classical mathematical optimization methods and modeling techniques of power system optimization associated with system planning,operation,and *** with the development of electric power industry,the concept of Energy Internet is addressed,which consists of power network,gas network,and transportation *** such new environments,electric power optimization faces some challenging with respect to the cooperation of multi-energy *** to the design structure and operational characteristics of the Energy Internet,some research areas of electric power optimization are presented from the viewofmathematical optimization modeling and *** aim is to provide some optimization methodology to solve the optimal issues of power system under the background of Energy Internet.

关键词： Mathematical optimization Electric power system Energy Internet Modeling and algorithm

Effects of ultrasonic-assisted extraction on bioactive compounds,volatile flavors and antioxidant activities of vine tea water extracts

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Traditional Medicine Research 2025年第1期10卷 73-81页

作者： Xiao-Long Zhou Wei-Jin Jiang Ji Yu Mao-Jun Yao Yun-tong Li Hunan Provincial Key Laboratory of Research Resource Mining and High-valued Utilization on Edible&Medicinal PlantCollege of Chemistry and Chemical EngineeringJishou UniversityJishou 416000China Hunan Gaoge Dairy Co. Ltd.Changsha 410000China

Background:Ampelopsis grossedentata,vine tea,which is the tea alternative beverages in *** vine tea processing,a large amount of broken tea is produced,which has low commercial ***:This study investigates the influence of different extraction methods(room temperature water extraction,boiling water extraction,ultrasonic-assisted room temperature water extraction,and ultrasonic-assisted boiling water extraction,referred to as room temperature water extraction(RE),boiling water extraction(BE),ultrasonic assistance at room temperature water extraction(URE),and ultrasonic assistance in boiling water extraction(UBE))on the yield,dihydromyricetin(DMY)content,free amino acid composition,volatile aroma components,and antioxidant properties of vine tea ***:A notable influence of extraction temperature on the yield of vine tea extracts(P<0.05),with BE yielding the highest at 43.13±0.26%,higher than that of RE(34.29±0.81%).Ultrasound-assisted extraction significantly increased the DMY content of the extracts(P<0.05),whereas DMY content in the RE extracts was 59.94±1.70%,that of URE reached 66.14±2.78%.Analysis revealed 17 amino acids,with L-serine and aspartic acid being the most abundant in the extracts,nevertheless ultrasound-assisted extraction reduced total free amino acid *** chromatography-mass spectrometry analysis demonstrated an increase in the diversity and quantity of compounds in the vine tea water extracts obtained through ultrasonic-assisted ***,69 and 68 volatile compounds were found in URE and UBE extracts,which were higher than the number found in RE and BE *** vitro,antioxidant activity assessments revealed varying antioxidant capacities among different extraction methods,with RE exhibiting the highest DPPH scavenging rate,URE leading in ABTS•+free radical scavenging,and BE demonstrating superior ferric ion reducing antioxidant ***:The findings suggest that extraction methods signi

关键词： vine tea dihydromyricetin ultrasonic-assisted extraction volatile aroma components