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Designing g-c_(3)N_(4)/N-Rich carbon Fiber composites for High-Performance Potassium-Ion Hybrid capacitors

Energy & Environmental Materials 2021年第4期4卷 638-645页

作者： Qing Shen Pengjie Jiang Hongcheng He Yanhong Feng Yong cai Danni Lei Mengqiu cai Ming Zhang Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and DevicesSchool of Physics and ElectronicsHunan UniversityChangsha 410082China State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-Sen(Zhongshan)UniversityGuangzhou 510275China Synergetic Innovation center for Quantum Effects and Applications(SIcQEA) Hunan Normal UniversityChangsha 410081China

Potassium-based energy storage devices(PEDS)are considered as hopeful candidates for energy storage applications b.c.use of the abundant potassium resources in nature and high mobility in the *** carbon materials show great potential for potassium-ion storage,poor rate performance,and unsatisfactory cycle lifespan in existing carbon-based PIbs anode,it also cannot match the dynamics and stability of the capacitor *** doping has been proven to be a effective modification strategy to improve the electrochemical performance of carbon ***,we prepare carbon nanofibers and g-c_(3)N_(4)composites with high nitrogen contents(19.78 at%);moreover,the sum of pyrrolic N and pyridinic N is up to 59.51%.It achieves high discharge capacity(391 m Ah g^(-1)at0.05 A g^(-1)),rate capacity(141 m Ah g^(-1)at 2 A g^(-1)),and long cycling performance(201 m Ah g^(-1)at 1 A g^(-1)over 3000 cycles)when as an anode for ***,it can deliver promising discharge capacity of132 m Ah g^(-1)at 0℃.Moreover,as battery anode for potassium-ion hybrid capacitors(PIHc)device with an active carbon cathode,it delivers energy/power density(62 and 2102 W kg^(-1))as well as high reversible capacity(106 m Ah g^(-1)at 1 A g^(-1)).

关键词： carbon nitride pyrrolic n pyridinic n potassiumion battery potassium-ion hybrid capacitor

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MIcROSTRUcTURE AND MEcHANIcAL PROPERTIES OF(Nb,Ti)c-NIcKEL bASE SUPERALLOY

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中国有色金属学会会刊：英文版 1998年第2期8卷 98-101页

作者： cai, Kefeng Nan, cewen Min, Xinmin Wuhan Univ of Technology Wuhan China

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦ（Ｎｂ，Ｔｉ）ＣＮＩＣＫＥＬＢＡＳＥＳＵＰＥＲＡＬＬＯＹ①ＣａｉＫｅｆｅｎｇ，ＮａｎＣｅｗｅｎａｎｄＭｉｎＸｉｎｍｉｎＳｔａｔｅＫｅｙＬ... 详细信息

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦ（Ｎｂ，Ｔｉ）ＣＮＩＣＫＥＬＢＡＳＥＳＵＰＥＲＡＬＬＯＹ①ＣａｉＫｅｆｅｎｇ，ＮａｎＣｅｗｅｎａｎｄＭｉｎＸｉｎｍｉｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＡｄｖａｎｃ...

关键词： mechanical properties microstructure titanium carbide

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Assays for RNA synthesis and replication by the hepatitis c virus

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Frontiers in biology 2012年第3期7卷 233-245页

作者： c. cheng KAO baochang FAN Sreedhar cHINNASWAMY Hui cai c.T. RANJITH-KUMAR Jerome DEVAL Department of Molecular & cellular biochemistry Indiana University Bloomington IN 47405 USA National Institute of biomedical Genomics (NIbMG) NSS Kalyani WB-74125L India Alios bioPharma lnc. South San Francisco CA 94080 USA

At least six major genotypes of Hepatitis c virus （HcV） cause liver diseases worldwide. The efficacy rates with current standard of care are about 50% against genotype 1, the most prevalent strain in the United States, Europe and Japan. Therefore more effective pan-genotypic therapies are needed. HcV RNA replication provides a number of validated targets for virus-specific and potentially pan-genotypic inhibitors. In vitro assays capturing the different steps of RNA synthesis are needed not only to identify new inhibitors, but also to examine their mechanisms of action. This review attempts to provide a comprehensive summary of the biochemical, cell-based and animal model systems to assess HcV polymerase activity and HcV RNA replication that should be useful for both basic research and applied studies.

关键词： assay RNA synthesis and replication hepatitis c virus

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Preparation and Anti-oxidation Mechanism of Mullite/Yttrium Silicate coatings on c/Sic composites

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Journal of Wuhan University of Technology(Materials Science) 2016年第6期31卷 1284-1288页

作者：马青松 cai lihui Science and lechnology on Advanced ceramic Pibers &composites Laboratory National University of Defense Technology Changsha 410073 China

In order to enhance the oxidation resistance of c/Si c composites, mullite/yttrium silicate coatings were fabricated on c/Si c composites through dip-coating route. Al_2O_3-SiO_2 sol with high solid content was selected as the raw material for mullite and ＂silicone resin ＋ Y_2O_3 powder＂ slurry was used to synthesize yttrium silicate. The microstructure and phase composition of coatings were characterized, and the investigation on oxidation resistance and anti-oxidation mechanism was emphasized. The as-fabricated coatings consisting of SiO_2-rich mullite phase and Y_2Si_2O_7 phase show high density and favorable bonding to c/Si c composites. After oxidized at 1 400 ℃ and 1 500 ℃ for 30 min in static air, the coating-containing c/Si c composites possess 91.9% and 102.4% of the original flexural strength, respectively. The desirable thermal stability of coatings and the further densification of coatings due to viscous flow of rich SiO_2 and Y-Si-Al-O glass are responsible for the excellent oxidation resistance. In addition, the coating-containing composites retain 99.0% of the original flexural strength and the coatings exhibit no cracking and desquamation after 12 times of thermal shock from 1 400 ℃ to room temperature, which are ascribed to the combination of anti-oxidation mechanism and preferable physical and chemical compatibility among c/Si c composites, mullite and Y_2Si_2O_7. The carbothermal reaction at 1 600 ℃ between free carbon in c/Si c substrate and rich SiO_2 in mullite results in severe frothing and desquamation of coatings and obvious degradation in oxidation resistance.

关键词： anti-oxidation coatings mullite yttrium silicate c/Sic composites

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没伞的孩子要努力奔跑

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2018年

作者： (美)b.c. 福布斯

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Predicting chromatographic Retention Time of c10-chlorinated Paraffins in Gas chromatography-Mass Spectrometry Using Quantitative Structure Retention Relationship

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chemical Research in chinese Universities 2015年第2期31卷 192-197页

作者： XIA Zhenzhen cai Wensheng SHAO Xueguang collaborative Innovation center of chemical Science and Engineering(Tianjin) State Key Laboratory of Medicinal Chemical Biology Research Center for Analytical Sciences College of Chemistry Nankai University Tianjin 300071 P. R. China

chlorinated paraffins（cPs） are potential persistent organic pollutants（POPs）, which threat the safety of environment and organisms. However, the analysis of cPs is a difficult task due to their complex composition containing thousands of congeners. In the present work, quantitative structure retention relationship（QSRR） of cPs was studied. A total of 470 molecular descriptors were generated, for describing the structures of 28 cPs and 12 descriptors relevant to retention time of the cPs were selected by stepwise regression. Then, QSRR models between retention time on the one hand and the selected descriptors on the other hand were established by multiple linear regres- sion（MLR）, partial least squares（PLS） and least square support vector regression（LS-SVR）. The result shows that PLS model is better than MLR and LS-SVR, obtaining a squared correlation coefficient（r2） of 0.9996 and a root mean squared error（RMSE） of 0.015. The PLS model was then used to predict the retention time of 49 c10-cPs. Three of them were investigated by gas chromatography coupled with mass spectrometry（Gc-MS）. A well-defined correlation was found between the measured retention time and the predicted value.

关键词： chlorinated paraffin Multivariate calibration Retention time Quantitative structure retention relationship

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A better Semi-online Algorithm for Q3/s_1=s_2≤s_3/c_(min) with the Known Largest Size

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Acta Mathematicae Applicatae Sinica 2012年第1期28卷 111-116页

作者： Sheng-yi cai Qi-fan YANG Department of Mathematics Zhejiang UniversityHangzhou 310027China School of Mathematics&Information Science Wenzhou UniversityWenzhou 325035China

This paper investigates the semi-online machine covering problem on three special uniform machines with the known largest size. Denote by sj the speed of each machine, j = 1, 2, 3. Assume 0 〈 s1 = s2 = r 〈 t = s3, and let s = t/r be the speed ratio. An algorithm with competitive ratio max（2, 3s＋6/s＋6 is presented. We also show the lower bound is at least max（2, 38 3s/s＋6）. For s ≤ 6, the algorithm is an optimal algorithm with the competitive ratio 2. besides, its overall competitive ratio is 3 which matches the overall lower bound. The algorithm and the lower bound in this paper improve the results of Luo and Sun.

关键词： analysis of algorithms scheduling machine covering semi-online competitive ratio

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Visible light-mediated c—P bond formation reactions

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Science bulletin 2019年第5期64卷 337-350页

作者： bao-Gui cai Jun Xuan Wen-Jing Xiao Anhui Province Key Laboratory of chemistry for Inorganic/Organic Hybrid Functionalized Materials College of Chemistry & Chemical Engineering Anhui University Key Laboratory of Pesticide & chemical biology Ministry of Education College of Chemistry Central China Normal University

Organophosphorus compounds have attracted continuous attention in materials science, agrochemical and pharmaceutical fields due to their unique bioactivities. Thus, the development of novel and robust manners for the construction new c—P bond has therefore gained great interests in synthetic organic chemistry. b.c.use of their intrinsic sustainability and green chemistry character, visible light-induced photoredox catalysis has been widely applied in the construction of new chemical bonds, including the formation of c—P bond. In this review, we summarized recent achievements in c—P bond formation reactions initiated by visible light-induced photoredox catalysis, which mainly focusing on the discussion of reaction design and the mechanism.

关键词： c-P bond formation Organophosphorus compounds Photoredox catalysis Visible light

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Net-c18:A Predicted Two-Dimensional Planar carbon Allotrope and Potential for an Anode in Lithium-Ion battery

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Energy & Environmental Materials 2021年第3期4卷 458-464页

作者： Xing Hong cai Qiang Yang Shaohui Zheng Min Wang chongqing Key Laboratory for Advanced Materials and Technologies of clean Energies School of Materials and EnergySouthwest UniversityChongqing 400715China

Net-c18,a predicted two-dimensional(2D)graphene-like carbon allotrope,is investigated via first-principles *** space group is *** are 18 carbon atoms per ***-c18 has five-,six-,and eight-membered ***-c18 may be formed by adding even pairs of carbon atoms on the top of hexagons to reconstruct new five-and eight-membered rings,extending the strategy of *** to that of graphene(-9.28 e V atom^(-1)),the total energy of net-c18(-9.15 e V atom^(-1))is only 0.13 e V atom^(-1)higher,revealing that net-c18 is energetically *** calculations of phonon and ab initio molecular dynamics(AIMD)demonstrate dynamical and thermal stability of *** independent elastic constants of net-c18 meet the criterial for the mechanical stability of 2D *** in-plane stiffness along x or y axis is comparably *** AIMD results reveal that net-c18 has good thermal stability at 1500 *** band structure also demonstrates that it is ***,the diffusion of Li atoms on net-c18 has a low energy barrier(0.32 e V),and net-c18 has a low open-circuit voltage(0.024 V)and a high theoretical specific capacity(403 m Ah g^(-1)).Thus,net-c18 may provide high-temperature resistant,flexible electrode in electronics and a promising metallic anode in lithium-ion *** proposed formation of net-c18 may open a new pattern defect for the designs of new carbon allotropes.

关键词： anode material first-principles calculations Li ion batteries two-dimensional materials

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Novel catalytic Hydrodechlorination of ccl_2F_2 over Supported Pdcl_2-(n-c_4H_9)_4N^+cl^- Molten salts

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chinese chemical Letters 2001年第6期12卷 533-536页

作者： Yu cai cAO Xuan Zhen JIANG Department of chemistry Zhejiang UniversityHangzhou 310027

A novel supported liquid phase film catalyst: Supported Pdcl2-(n-c4H9),N+cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of ccl2F2 (cFc-12) to its alternatives cH2F2 and cHclF2. Addition of cocl2, Gacl3 and cucl2 to Pdcl2-(n-c4H9),N+cl- modifies the catalytic performance of supported molten salts.

关键词： Liquid film catalyst palladium chloride tetrabutylammonium chloride molten salts cFc-12 hydrodechlorination HFc-32 HcFc-22

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