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Co_2O_3-doping Effect on the Formation of 3CaO 3Al_2O_3 CaSO_4

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Journal of Wuhan University of Technology(Materials Science) 2013年第2期28卷 347-351页

作者：郭惠玲谢峻林 tan chang YU Youjia RAO Chengcheng Department of Pharmacy College of Bioengineering Hubei University of Technology Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education Wuhan University of Technology

The Co2O3-doping effect on the formation of 3CaO · 3A12O3· CaSO from CaCO3-A12O3-CaSO4, 2H20 mixtures was investigated by means of SO2 emission behavior, chemical analysis, X-ray diffraction, differential thermal analysis and scanning electron microscopy. The experimental results show that CO2O3 addition increases the reactivity of the CaCO3-A12O3-CaSO4·2H2O system significantly, by reducing SO2 emissions in combustion andf-CaO contents in the clinkers, promoting the nucleation and growth of 3CaO·3A12O3-CaSO4, and intensifying the formation of 3CaO·3A12O3·CaSO4. Moreover, CO2O3 addition lowers the formation temperature of 3CaO·3A12O3·CaSO4 by 18 ℃, and similarly increases the thermal stability of it at a wider temperature range.

关键词： 3CaO · 3A12O3· CaSO Co2O3 SO2 emission thermal analysis

Computation of the Rational Representation for Solutions of High-dimensional Systems

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Communications in Mathematical Research 2010年第2期26卷 119-130页

作者： tan chang ZHANG SHU-GONG Institute of Mathematics Jilin University Changchun 130012

This paper deals with the representation of the solutions of a polynomial system, and concentrates on the high-dimensional case. Based on the rational univari- ate representation of zero-dimensional polynomial systems, we give a new description called rational representation for the solutions of a high-dimensional polynomial sys- tem and propose an algorithm for computing it. By this way all the solutions of any high-dimensional polynomial system can be represented by a set of so-called rational- representation sets.

关键词： rational univariate representation high-dimensional ideal maximally independent set rational representation irreducible component

A Statistical Study of Rapid Sunspot Structure change Associated with Flares

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Chinese Journal of Astronomy and Astrophysics 2007年第5期7卷 733-742页

作者： Wei-Zhong Chen chang Liu Hui Song Na Deng chang-Yi tan Hai-Min Wang Center for Solar-Terrestrial Research New Jersey Institute of Technology University Heights Newark N J 07102-1982 USA

We reported recently some rapid changes of sunspot structure in white-light （WL） associated with major flares. We extend the study to smaller events and present here results of a statistical study of this phenomenon. In total, we investigate 403 events from 1998 May 9 to 2004 July 17, including 40 X-class, 174 M-class, and 189 C-class flares. By monitoring the structure of the flaring active regions using the WL observations from the Transition Region and Coronal Explorer （TRACE）, we find that segments in the outer sunspot structure decayed rapidly right after many flares; and that, on the other hand, the central part of sunspots near the flare-associated magnetic neutral line became darkened. These rapid and permanent changes are evidenced in the time profiles of WL mean intensity and are not likely resulted from the flare emissions. Our study further shows that the outer sunspot structure decay as well as the central structure darkening are more likely to be detected in larger solar flares. For X-class flares, over 40% events show distinct sunspot structure change. For M- and C-class flares, this percentage drops to 17% and 10%, respectively. The results of this statistical study support our previously proposed reconnection picture, i.e., the flare-related magnetic fields evolve from a highly inclined to a more vertical configuration.

关键词： Sun activity -- Sun flares -- Sun magnetic fields -- sunspots

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一种不须停电且无电量损失的电能表更换方法

农村电气化 2024年第7期 91-92页

作者：许继东巴德彧谭畅刘国强国网东丰县供电公司吉林东丰136300

现有电能表更换技术普遍存在若干问题,实用性较差。为此,文章提出一种实用性很强的电能表更换方法,该方法基本步骤是通过换表线先行并入新表,然后拆离旧表,最后装上新表。该方法具有不须用户停电、不存在电量损失、电量交接简单、绝缘... 详细信息

现有电能表更换技术普遍存在若干问题,实用性较差。为此,文章提出一种实用性很强的电能表更换方法,该方法基本步骤是通过换表线先行并入新表,然后拆离旧表,最后装上新表。该方法具有不须用户停电、不存在电量损失、电量交接简单、绝缘防护完善等优点。

关键词：电能表更换不停电电量损失鳄鱼夹螺纹杆热缩管

Fourth-order phase-field modeling for brittle fracture in piezoelectric materials

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 837-856页

作者： Yu tan Fan PENG chang LIU Daiming PENG Xiangyu LI State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Science Chang'an UniversityXi'an 710064China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Failure analyses of piezoelectric structures and devices are of engineering and scientific *** this paper,a fourth-order phase-field fracture model for piezoelectric solids is developed based on the Hamilton *** typical electric boundary conditions are involved in the present model to characterize the fracture behaviors in various physical situations.A staggered algorithm is used to simulate the crack *** polynomial splines over hierarchical T-meshes(PHT-splines)are adopted as the basis function,which owns the *** numerical simulations are performed to study the influence of the electric boundary conditions and the applied electric field on the fracture behaviors of piezoelectric *** electric boundary conditions may influence crack paths and fracture loads *** present research may be helpful for the reliability evaluation of the piezoelectric structure in the future applications.

关键词： isogeometric analysis(IGA) brittle fracture fourth-order phase-field model piezoelectric solid

Interfacial engineering of CdS for efficient coupling photoredox

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Chinese Chemical Letters 2023年第7期34卷 260-264页

作者： Ming-Hui Sun Ming-Yu Qi chang-Long tan Zi-Rong tang Yi-Jun Xu College of Chemistry State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350116China

Ternary composites of reduced graphene oxide(GR)-CdS-Pd have been successfully synthesized via solvothermal and photodeposition methods for photocatalytic selective conversion of benzyl alcohol(BA)coupled with hydrogen(H_(2))production, which exhibit significantly improved photoactivity and selectivity than bare CdS. Mechanistic studies unveil that the cooperative effect of the close interface contact and matched energy level alignment between electrical conducting GR nanosheets(NSs) and CdS nanoparticles(NPs) in GR-CdS-Pd composite not only benefits the separation and transfer of photogenerated carriers but also improves the photocorrosion resistance of CdS. The photodeposited Pd NPs further promote the photogenerated charge separation and accelerate the formation of intermediate products(α-hydroxybenzyl radicals), thereby contributing to enhanced conversion of BA. This work would facilitate the rational design of GR as cocatalyst to construct an efficient and stable CdS-based composite photocatalyst for cooperative coupling of fine chemical synthesis and H_(2) evolution.

关键词： CdS Reduced graphene oxide Pd Coupling photoredox reaction Hydrogen Alcohol oxidation

土壤微塑料与重金属复合污染机理及其植物生理效应研究进展

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湖南师范大学自然科学学报 2024年第4期47卷 104-112页

作者：黄硕霈谭长银涂晨曹雪莹杨佳邢倩雯马军张培育湖南师范大学地理科学学院中国长沙410081 长沙学院乡村振兴研究院中国长沙410022 中国科学院土壤环境与污染修复重点实验室(南京土壤研究所) 中国南京210008

微塑料能够吸附土壤中的重金属并形成复合污染,改变单一污染物的环境行为,进而影响植物生长发育。本研究综合评述了土壤微塑料与重金属的复合污染机理、关键控制因素及其对植物的生理影响。土壤中的微塑料可作为载体吸附重金属,影响重... 详细信息

微塑料能够吸附土壤中的重金属并形成复合污染,改变单一污染物的环境行为,进而影响植物生长发育。本研究综合评述了土壤微塑料与重金属的复合污染机理、关键控制因素及其对植物的生理影响。土壤中的微塑料可作为载体吸附重金属,影响重金属的生物有效性,改变重金属在土壤-植物系统中迁移行为,且该过程与微塑料种类、形貌、粒径、老化程度以及重金属种类、浓度、生物有效性等因素密切相关。土壤微塑料与重金属能够吸附在植物表面或进入植物体内,影响植物生长,改变光合作用强度,诱导氧化应激和抗氧化活性酶变化,影响植物代谢和营养吸收等。同时,植物体内富集的微塑料与重金属可沿食物链进行迁移,威胁人类生命健康。本文最后对土壤微塑料与重金属复合污染的研究进行了展望,以期为后续研究提供参考。

关键词：土壤-植物系统微塑料重金属复合污染生理效应

Metabolic bariatric surgery and type 2 diabetes mellitus:an endocrinologist's perspective

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The Journal of Biomedical Research 2015年第2期29卷 105-111页

作者： Sonali Ganguly Hong chang tan Phong Ching Lee Kwang Wei Tham The Obesity & Metabolic Unit Department of EndocrinologyLIFE CentreSingapore General Hospital

Traditional treatment of T2 DM consisting of modification of diet,an exercise regimen,and pharmacotherapy has problems of poor lifestyle modifications and fail tend of treatment over time,now bariatric surgery is recommended for treatment of obese patients with T2 DM because its great improvements on weight loss and *** this article,effects of bariatric surgery on diabetes and diabetes-related complications are reviewed.

关键词： type 2 diabetes mellitus metabolic bariatric surgery diabetes remission

Study of axial double layer in helicon plasma by optical emission spectroscopy and simple probe

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Plasma Science and Technology 2018年第7期20卷 106-111页

作者： Gao ZHAO Wanying ZHU Huihui WANGl Qiang CHEN chang tan Jiting OUYANG School of Physics Beijing Institute of TechnologyBeijing 100081People＇s Republic of China Laboratory of Plasma Physics ＆ Materials Beijing Institute of Graphic CommunicationBeijing 102600 People＇s Republic of China Shanxi Key Laboratory of Plasma Physics and Applied Technology Xi＇an Aerospace Propulsion InstituteXi＇an 710100People＇s Republic of China

In this work we used a passive measurement method based on a high-impedance electrostatic probe and an optical emission spectroscope （OES） to investigate the characteristics of the double layer （DL） in an argon helicon plasma. The DL can be confirmed by a rapid change in the plasma potential along the axis. The axial potential variation of the passive measurement shows that the DL forms near a region of strong magnetic field gradient when the plasma is operated in wave- coupled mode, and the DL strength increases at higher powers in this experiment. The emission intensity of the argon atom line, which is strongly dependent on the metastable atom concentration, shows a similar spatial distribution to the plasma potential along the axis. The emission intensity of the argon atom line and the argon ion line in the DL suggests the existence of an energetic electron population upstream of the DL. The electron density upstream is much higher than that downstream, which is mainly caused by these energetic electrons.

关键词： helicon discharge double layer plasma diagnosis plasma potential