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Effects of Al and Co doping on the structural stability and high temperature cycling performance of LiNi_(0.5)Mn_(1.5)O_(4) spinel cathode materials

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Chinese Journal of Chemical Engineering 2023年第9期61卷 201-209页

作者： Jianfeng Cheng Meixuan Li Yutong wang Jiexiang Li Jiawei Wen chunxia wang Guoyong Huang College of New Energy and Materials China University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(Beijing)Beijing 102249China

The poor structural stability and capacity retention of the high-voltage spinel-type LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)limits their further ***,Al and Co were doped in LNMO materials for a more stable structure and *** LNMO,LiNi_(0.45)Al_(0.05)Mn_(1.5)O_(4)(LNAMO)and LiNi_(0.45)Co_(0.05)Mn_(1.5)O_(4)(LNCMO)were synthesized by calcination at 900℃ for 8 h,which was called as solid-phase method and applied universally in ***,FT-IR and CV test results showed the synthesized samples have cation disordering Fd-3m space group ***,the incorporation of Al and Co increased the cation disordering of LNMO,thereby increasing the transfer rate of Li+.The SEM results showed that the doped samples performed more regular and *** EDS elemental analysis confirmed the uniform distribution of each metal element in the ***,the doped samples showed better electrochemical properties than undoped *** LNAMO and LNCMO samples were discharged with specific capacities of 116.3 mA·h·g^(-1)and 122.8 mA·h·g^(-1)at 1 C charge/discharge rate with good capacity retention of 95.8% and 94.8% after 200 cycles at room temperature,*** capacity fading phenomenon of the doped samples at 50℃ and 1 C rate was significantly ***,cations doping also enhanced the rate performance,especially for the LNCMO,the discharge specific capacity of 117.9 mA·h·g^(-1)can be obtained at a rate of 5 C.

关键词： High voltage spinel Al/Co doping High temperature cycling stability

Studies and Properties of Ceramics with High Thermal Conductivity

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Journal of Rare Earths 2006年第z1期24卷 189-192页

作者： Chen Guangle Fan Shigang Zhao chunxia wang Kun Xia Shuqin Research Institute of Synthetic Crystals Research and Development Center Beijing 100018 China Research Institute of Synthetic Crystals Research and Development Center Beijing 100018 China Research Institute of Synthetic Crystals Research and Development Center Beijing 100018 China Research Institute of Synthetic Crystals Research and Development Center Beijing 100018 China Research Institute of Synthetic Crystals Research and Development Center Beijing 100018 China

The sintering technology of the AlN ceramics power were discussed. It is discussed that the compound sintering aids is consistent with the enhancement of the the thermal conductivity of AlN ceramics, and sintering technics is helped to the improvement of density. It is analyzed how to sinter machinable AlN ceramics with high thermal conductivity. And the microstructure of compound ceramics based on AlN was studied.

关键词： sintering aids hot-pressed high thermal conductivity machinable composite ceramics

Effects of autumn plowing on the movement and correlation of moisture,heat and nitrate nitrogen in seasonal freeze-thaw soil

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 143-152页

作者： Kai Sun chunxia wang Hongguang Liu Fei Liang Yaqin wang College of Water Conservancy&Architectural Engineering ShiheziUniversityShihezi 832000XinjiangChina Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production&Construction Group Shihezi UniversityShihezi 832000XinjiangChina Xinjiang Academy of Agricultural Reclamation Shihezi 832000XinjiangChina

A two-year experiment was established in northern Xinjiang to investigate the effects of autumn plowing methods on nitrate nitrogen accumulation,spring-sown soil conditions and cotton emergence rate,and to explore the response relationship between soil water,heat and nitrate *** experiment included five autumn plowing treatments,namely,plough tillage(FG),no-tillage(MG),ridge and furrow alternation(LG),plough tillage with straw mulch(FJ)and plough tillage with activated charcoal mulch(FH).The results showed that both FH and FJ treatments were beneficial to promote the nitrate-nitrogen accumulation in topsoil,while FG,MG and LG treatments aggravated the nitrate nitrogen leaching in *** the freezing period,FH and FJ treatments were beneficial to reduce soil heat loss and facilitate the coordinated upward migration of soil water and nitrate *** the thawing period,FH and FJ treatments favored suppressing the synergistic downward transport of soil water and nitrate-nitrogen and motivated the synergistic upward migration of heat and nitrate nitrogen in deep *** regression analysis suggested that the interaction between water,heat and nitrate nitrogen under FH and FJ treatments showed a highly significant *** and FJ treatments showed obvious advantages in regulating soil conditions and optimizing soil water,heat and nitrate nitrogen co-transport *** the spring sowing period,the FH and FJ treatments increased the average soil temperature by 0.99℃and 1.29℃,and the average soil moisture content by 6.01%and 8.70%,and the average soil nitrate content by 10.20 mg/kg and 10.47 mg/kg,in the 0-25 cm soil layer,*** and FJ treatments significantly grew the emergence rate of cotton,which can be used as the main autumn tillage strategies in arid areas of northern Xinjiang.

关键词： autumn plowing seasonal freeze-thaw nitrate nitrogen accumulation water-heat-nitrogen interaction Xinjiang

Palladium-catalyzed 2-pyridylmethyl-directed β-C(sp^3)—H activation and cyclization of aliphatic amides with gem-dibromoolefins:A rapid access to γ-lactams

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Chinese Chemical Letters 2018年第1期29卷 191-193页

作者： Danni Zhou chunxia wang Mingliang Li Zheng Long Jingbo Lan Key Laboratory of Green Chemistry and Technology of Ministry of Education College of ChemistrySichuan University

The direct Pd-catalyzed β-C（sp3）--H activation and cyclization of aliphatic amides bearing a removable 2-pyridylmethyl directing group with gem-dibromoolefins is described for the first time to construct a variety of γ-lactams, The resulting products with Z- and E-configurations can be easily separated and purified after the reaction, demonstrating the effectiveness and applicability of the method herein developed.

关键词： C(spS)-H activationPalladium-catalyzedgem-DibromoolefinsRemovable directing groupγ-Lactams

Reduced graphene oxide supported Pd-Cu-Co trimetallic catalyst:synthesis,characterization and methanol electrooxidation properties

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Journal of Energy Chemistry 2019年第2期28卷 72-78页

作者： Fan Yang Bing Zhang Sen Dong chunxia wang Andong Feng Xiaoxu Fan Yongfeng Li State Key Laboratory of Heavy oil Processing China University of Petroleum

Trimetallic palladium-copper-cobalt nanoparticles supported on reduced graphene oxide(PdCuCo/RGO)with different molar ratios of Pd,Cu and Co can be synthesized by facile chemical reduction with NaBH_4 as reductant and cetrimonium bromide as *** morphology,structure and composition of the as-synthesized catalysts are characterized by transmission electron microscopy,X-ray diffraction and Xray photoelectron *** cyclic voltammetry and chronoamperometry are utilized to investigate the electrochemical activities and stabilities of the as-obtained *** results demonstrate that the PdCuCo/RGO catalyst shows superior catalytic activity and stability for methanol electrooxidation in alkaline media compared with PdCu/RGO,PdCo/RGO,and Pd/RGO *** findings suggest that the PdCuCo/RGO catalyst possesses a great potential as a promising anode catalyst for direct methanol fuel cells.

关键词： Trimetallic nanoparticles Reduced graphene oxide Methanol oxidation

The RING-H2 gene LdXERICO plays a negative role in dormancy release regulated by low temperature in Lilium davidii var. unicolor

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Horticulture Research 2023年第4期10卷 135-146页

作者： Xinyue Fan Xiaoman Zou Linlan Fu Yue Yang Min Li chunxia wang Hongmei Sun Key Laboratory of Protected Horticulture of Education Ministry College of HorticultureShenyang Agricultural UniversityShenyang 110866China National and Local Joint Engineering Research Center of Northern Horticultural Facilities Design and Application Technology Shenyang 110866China

Dormancy regulation is the basis of the sustainable development of the lily ***,basic research on lily dormancy is crucial for innovation in lily cultivation and *** studies revealed that dormancy release largely depends on abscisic acid(ABA)***,the key genes and potential regulatory network remain *** used exogenous ABA and ABA inhibitors to elucidate the effect of ABA on lily *** on the results of weighted gene coexpression network analysis(WGCNA),the hub gene LdXERICO was identified in modules highly related to endogenous ABA,and a large number of coexpressed genes were *** was induced by exogenous ABA and expressed at higher levels in tissues with vigorous physiological *** LdXERICO increased the low-temperature sensitivity of bulblets and accelerated bulblet *** rescued the ABA insensitivity of xerico mutants during seed germination in Arabidopsis,suggesting that it promotes seed dormancy and supporting overexpression studies on lily *** significant increase in ABA levels in transgenic Arabidopsis expressing LdXERICO indicated that LdXERICO played a role by promoting ABA *** generated three transgenic lines by overexpressing LdICE1 in Arabidopsis thaliana and showed that,in contrast to LdXERICO,LdICE1 positively regulated dormancy ***,qRT-PCR confirmed that LdXERICO was epistatic to LdICE1 for dormancy *** propose that LdXERICO,an essential gene in dormancy regulation through the ABA-related pathway,has a complex regulatory network involving temperature *** study provides a theoretical basis for further exploring the mechanism of bulb dormancy release.

关键词： release Arabidopsis network

Effects of timing and duration under brackish water mulch drip irrigation on cotton yield in northern Xinjiang,China

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 115-122页

作者： wang chunxia Yang Guang Li Junfeng He Xinlin Xue Lianqing Long Aihua College of Water Conservancy and Architectural Engineering Shihezi UniversityShihezi 832003China Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production and Construction Corps Shihezi 832000China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China

The brackish water is an important potential water source and has frequently been utilized to drip-irrigate cotton due to the water shortage in the arid region of Xinjiang,northwestern of *** brackish water is usually saline water with salinity ranging from 1 g/L to 5 g/L,which is widely distributed in this area,so the reasonable use of that brackish water may not only play a vital role in the local agricultural production,but also save plenty of ***,irrigation with brackish water usually causes the reduction of crop yield and soil salinization which can negatively impact plants through three major components:osmotic,nutritious and toxic ***,a field experiment,with eight different time-series irrigation modes using brackish water(3.5±0.2)g/L and freshwater(<1 g/L),beneath a combined film and drip-irrigation system was carried out to study the changes of soil salt content and cotton yield aiming to search for a balanced method during the 2 cotton growing seasons in 2012 and *** results indicated that the time-series irrigation modes determined the soil salinity and moisture distribution based on observed spatio-temporal distribution of water content and electric conductivity,and soil salinity generally gathered at the depth of 0-10 cm and 60 cm of soil with the increase of irrigation ***,the results demonstrated that the yields of cotton which was grown using brackish water and freshwater were better than those only using freshwater and the soil salinity with reasonable irrigation timing was not accumulated obviously.

关键词： brackish water mulch drip irrigation timing and duration for irrigation irrigation scheduling cotton

Single copper sites dispersed on hierarchically porous carbon for improving oxygen reduction reaction towards zinc-air battery

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Nano Research 2021年第4期14卷 998-1003页

作者： Wenjie Wu Yan Liu Dong Liu Wenxing Chen Zhaoyi Song Ximin wang Yamin Zheng Ning Lu chunxia wang Junjie Mao Yadong Li State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of PetroleumBeijing 102249China Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Province Key Laboratory of Optoelectric Materials Science and Technology and Anhui Laboratory of Molecule-Based MaterialsAnhui Normal UniversityWuhu 241002China State key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemistry Tsinghua UniversityBeijing 100084China

The demand for high-performance non-precious-metal electrocatalysts to replace the noble metal-based catalysts for oxygen reduction reaction(ORR)is intensively ***,single-atomic copper sites supported on N-doped three-dimensional hierarchically porous carbon catalyst(Cu_(1)/NC)was prepared by coordination pyrolysis ***,the Cu_(1)/NC-900 catalyst not only exhibits excellent ORR performance with a half-wave potential of 0.894 V(***)in alkaline media,outperforming those of commercial Pt/C(0.851 V)and Cu nanoparticles anchored on N-doped porous carbon(CuNPs/NC-900),but also demonstrates high stability and methanol ***,the Cu_(1)/NC-900 based Zn-air battery exhibits higher power density,rechargeability and cyclic stability than the one based on Pt/*** experimental and theoretical investigations demonstrated that the excellent performance of the as-obtained Cu_(1)/NC-900 could be attributed to the synergistic effect between copper coordinated by three N atoms active sites and the neighbouring carbon defect,resulting in elevated Cu d-band centers of Cu atoms and facilitating intermediate desorption for ORR *** study may lead towards the development of highly efficient non-noble metal catalysts for applications in electrochemical energy conversion.

关键词： single atomic sites catalysts nitrogen-doped carbon materials oxygen reduction reaction carbon defect non-noble metal

Super enhancers:Pathogenic roles and potential therapeutic targets for acute myeloid leukemia(AML)

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Genes & Diseases 2022年第6期9卷 1466-1477页

作者： Ziyang Cao Yi Shu Jinxia wang chunxia wang Tienan Feng Li Yang Jingbo Shao Lin Zou Clinical Research Unit Shanghai Children’s HospitalShanghai Jiao Tong UniversityShanghai 200062PR China Institute of Pediatric Infection ImmunityCritical Care MedicineShanghai Jiao Tong University School of MedicineShanghai 200062PR China Center for Clinical Molecular Laboratory Medicine of Children’s Hospital of Chongqing Medical University Chongqing 400014PR China Clinical Research Institute Shanghai Jiao Tong University School of MedicineShanghai 200025PR China Department of Hematology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016PR China Department of Hematology/Oncology Shanghai Children’s HospitalShanghai Jiao Tong UniversityShanghai 200062PR China

Acute myeloid leukemia(AML)is a malignant hematological tumor with disordered oncogenes/tumor suppressor genes and limited *** potent anti-cancer effects of bromodomain and extra-terminal domain(BET)inhibitors,targeting the key component of super enhancers,in early clinical trials on AML patients,implies the critical role of super enhancers in ***,we review the concept and characteristic of super enhancer,and then summarize the current researches about super enhancers in AML pathogenesis,diagnosis and classification,followed by illustrate the potential super enhancer-related targets and drugs,and propose the future directions of super enhancers in *** information provides integrated insight into the roles of super enhancers in this disease.

关键词： Classification Leukemogenesis Super enhancer Therapy targets