|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A case study of spatial heterogeneity of soil moisture in the Loess Plateau,western China:A geostatistical approach显示文摘Soil moisture distribution shows highly variation both spatially and temporally. This study assesses the spatial heterogeneity of soil moisture on a hill-slope scale in the Loess Plateau in West China by using a geostatistical approach. Soil moisture was measured by time-domain reflectometry(TDR) in 313 samples. Two kinds of sampling scales were used(2 x 2 m and 20 x 20 m) at two soil layers(0-30 cm and 30-60 cm). The general characteristics of soil moisture were analyzed by a classical statistics method,and the spatial heterogeneity of soil moisture was analyzed using a geostatistical approach. The results showed that the spherical model is the best-fit model to simulate soil moisture on the experimental hill-slope. The parameters of this model indicated that the spatial dependence of soil moisture in the selected hill-slope was moderate. Even the 2 x 2 m sampling scale was too coarse to show the detailed spatial variances of soil moisture in this area. The dependent distance increased from 27.4 m to 494.16 m as the sampling scale became coarse(from 2 x 2 m to 20 x 20 m). A map of soil moisture was generated by using original soil moisture data and interpolated values determined by the Kriging method. The average soil moisture(area weighted) in the different layers of soil was calculated on the basis of this map(10.94% for the 0-30 cm soil layer,11.88% for the 30-60 cm soil layer). This average soil moisture is lower than the corresponding average effective soil moisture,which suggests that the soil moisture is not sufficient to support vegetation in this area. | BI Huaxing LI Xiaoyin LIU Xin GUO Mengxia LI Jun | 2009 | International Journal of Sediment Research2009，24，1： | 15 |
| 2 | Transition metal-nitrogen-carbon nanostructured catalysts for the oxygen reduction reaction: From mechanistic insights to structural optimization显示文摘在阴极加速限制率的氧减小反应(ORR ) 为燃料房间的商品化仍然是最前的问题。转变 metal-nitrogen-carbon (M-N/C, M = Fe,公司,等等) nanostructures 在实际燃料房间应用与令人满意的活动和稳定性是非宝贵的金属催化剂(NPMC ) 的最有希望的班。然而,活跃地点的长争论的性质并且逃犯结构表演关联阻碍 M-N/C 材料的进一步的开发。在这评论,我们阐明的现在的最近的努力由采用可以提供 M-N/C 催化剂的深刻机械学的理解的许多物理化学的技术的活跃地点的实际结构。然后,我们为控制结构的一致性并且在催化材料最大化活跃地点的数字与定制的先锋体系结构和修改合成线路为 M-N/C 材料在结构的优化策略集中于惊人进步。恰好活跃的中心的识别和 nanostructures 的地点特定的工程为设计有益的 M-N/C 催化剂提供未来方向。 | Mengxia Shen Changting Wei Kelong Ai Lehui Lu | 2017 | Nano Research2017，10，5： | 8 |
| 3 | Simulation of large-scale numerical substructure in real-time dynamic hybrid testing显示文摘A solution scheme is proposed in this paper for an existing RTDHT system to simulate large-scale finite element(FE) numerical substructures. The analysis of the FE numerical substructure is split into response analysis and signal generation tasks, and executed in two different target computers in real-time. One target computer implements the response analysis task, wherein a large time-step is used to solve the FE substructure, and another target computer implements the signal generation task, wherein an interpolation program is used to generate control signals in a small time-step to meet the input demand of the controller. By using this strategy, the scale of the FE numerical substructure simulation may be increased significantly. The proposed scheme is initially verified by two FE numerical substructure models with 98 and 1240 degrees of freedom(DOFs). Thereafter, RTDHTs of a single frame-foundation structure are implemented where the foundation, considered as the numerical substructure, is simulated by the FE model with 1240 DOFs. Good agreements between the results of the RTDHT and those from the FE analysis in ABAQUS are obtained. | Zhu Fei Wang Jinting Jin Feng Zhou Mengxia Gui Yao | 2014 | Earthquake Engineering and Engineering Vibration2014，13，4： | 7 |
| 4 | Hybrid Precoding for mm Wave Massive MIMO Systems with Different Antenna Arrays显示文摘In this paper, the performance of hybrid precoding is investigated for mmWave massive MIMO systems with different antenna arrays. The hybrid precoding with partially connected architecture (PCA) is adopted. The spectral efficiency (SE) and received energy efficiency (EE) are investigated by considering four types of antenna arrays, including uniform linear array (ULA), uniform rectangular planar array (URPA), uniform hexagonal planar array (UHPA), and uniform circular planar array (UCPA), respectively. We focus on analysis at the antenna response vector and utilize the idea of orthogonal matching pursuit algorithm to seek the optimal hybrid precoder. Furthermore, the trade-off of precoding architectures is studied between SE and received EE. Simulation results show that if the uniform planar array antenna is more concentrated, the SE and receive EE will be higher. Considering SE and received EE, the performance of planar arrays outperform linear array. There exist different optimal radio-frequency chain numbers to maximize the SE for planar array and linear array. In addition, the PCA can achieve relatively higher received EE while the SE is close to the fully connected architecture and the full digital architecture. | Qingfeng Ding Yuqian Deng Xinpeng Gao Mengxia Liu | 2019 | China Communications2019，16，10： | 6 |
| 5 | Chemoselective hydrogenolysis of tetrahydrofurfuryl alcohol to 1,5-pentanediol over Ir-MoO_x/SiO_2 catalyst显示文摘In this work, MoOx promoted Ir/SiO2 catalysts were prepared and used for the selective hydrogenolysis of tetrahydrofurfuryl alcohol(THFA)to 1,5-pentanediol in a continuous flow reactor. The effects of different noble metals(Ir, Pt, Pd, Ru, Rh), supports and Ir contents were screened.Among the investigated catalysts, 4 wt%Ir-MoOx/SiO2 with a Mo/Ir atomic ratio of 0.13 exhibited the best catalytic performance. The synergy between Ir particles and the partially reduced isolated MoOx species attached on them is essential for the excellent catalytic performance of Ir-MoOx/SiO2. The catalyst exhibited a better hydrogenolysis efficiency of THFA with the selectivity of 1,5-pentanediol of 65%–74% at a conversion of THFA of 70%–75% when the initial THFA concentration is ranging from 20 wt% and 40 wt%. And higher system pressure was also in favor of the conversion of THFA. During a stability test, the conversion of THFA and 1,5-pentanediol yield over Ir-MoOx/SiO2 decreased with reaction time, which can be explained by the leaching of Mo species during the reaction. | Zhiqiang Wang Boonrat Pholjaroen Mengxia Li Wenjun Dong Ning Li Aiqin Wang Xiaodong Wang Yu Cong Tao Zhang | 2014 | Journal of Energy Chemistry2014，23，4： | 6 |
| 6 | Recent advances in screening of enzymes inhibitors based on capillary electrophoresis显示文摘Capillary electrophoresis with many advantages plays an important role in pharmaceutical analysis and drug screening. This review gives an overview on the recent advances in the developments and applications of capillary electrophoresis in the field of enzyme inhibitor screening. The period covers 2013 to 2017. Both the pre-capillary enzyme assays and in-capillary enzyme assays which include electrophoretically mediated microanalysis(EMMA) and immobilized enzyme microreactor(IMER) are summarized in this article. | Mengxia Cheng Zilin Chen | 2018 | Journal of Pharmaceutical Analysis2018，8，4： | 5 |
| 7 | Facile microwave-assisted ionic liquid synthesis of sphere-like BiOBr hollow and porous nanostructures with enhanced photocatalytic performance显示文摘In this work, two kinds of self-assembled hierarchical BiOBr microcrystals were rapidly synthesized through a simple microwave-assisted route in the presence of reactable ionic liquid 1-hexadecyl-3-methylimidazolium bromide([C_(16)mim]Br). These porous and hollow BiOBr microspheres were obtained via a facile solvothermal method with or without polyvinyl pyrrolidone(PVP), respectively. During the synthetic process, ionic liquid [C_(16)mim]Br played as solvent, reactant and template at the same time. Moreover, the BiOBr hollow and porous microspheres exhibited outstanding photocatalytic activities for the degradation of rhodamine B(RhB) under visible light irradiation. A possible photocatalytic mechanism was also discussed in detail. It can be assumed that the higher photocatalytic activities of BiOBr porous microspheres materials could be ascribed to the novel structure, larger specific surface area, narrower band gap structure and smaller particle size. | Zhigang Chen Jie Zeng Jun Di Dexiang Zhao Mengxia Ji Jiexiang Xia Huaming Li | 2017 | Green Energy & Environment2017，2，2： | 5 |
| 8 | Determination and vertical distribution of nitrogen species in sediments of Funan Rivers, Chengdu City, China显示文摘 | Yi WU Tingting WANG Qing XU Mengxia LIAO Tianong DENG | 2006 | Chinese Journal Of Geochemistry2006，25，B08： | 4 |
| 9 | Expression Analysis of Genes Related to Auxin Metabolism at Different Growth Stages of Pak Choi显示文摘Pak choi is a low-temperature vernalized plant that readily undergoes premature bolting during spring, but little is known about the governing molecular regulation of vernalization. In order to enhance our understanding of mechanism about premature bolting, we discussed the relationship between auxin(indole-3-acetic acid, IAA) and flowering of pak choi. During vernalization, hormone metabolism is an important regulatory pathway, and IAA plays a specific role. IAA metabolism has been studied in Arabidopsis thaliana and other plants, but not in pak choi. In this paper, the IAA content in pak choi shoot apices during vernalization and different growth stages was compared. The IAA content decreased significantly after low-temperature treatment(4 °C) and then increased rapidly during vegetative growth. During floral bud initiation,the IAA content decreased rapidly and was the lowest. Expressions of genes encoding key IAA metabolic enzymes were analyzed, and a major synthetase-encoding gene was downregulated, while a key degrading enzyme-encoding gene was upregulated during each comparison period,resulting in decreased IAA content. Expressions of four genes(Bra034975, Bra030246, Bra012239 and Bra040296) were consistent with changes in the IAA content. The functions of differentially expressed genes(DEGs) were analyzed, and 15 DEGs were found to be related to IAA metabolism.The findings illuminated the molecular mechanism regulating IAA content during vernalization in pak choi. | Yuxiang Hou Xueting Wang Zhujun Zhu Mengxia Sun Meilan Li Leiping Hou | 2020 | Horticultural Plant Journal2020，6，1： | 4 |
| 10 | A putative bHLH transcription factor is a candidate gene for male sterile 32,a locus affecting pollen and tapetum development in tomato显示文摘The tomato(Solanum lycopersicum)male sterile 32(ms32)mutant has been used in hybrid seed breeding programs largely because it produces no pollen and has exserted stigmas.In this study,histological examination of anthers revealed dysfunctional pollen and tapetum development in the ms32 mutant.The ms32 locus was fine mapped to a 28.5 kb interval that encoded four putative genes.Solyc01g081100,a homolog of Arabidopsis bHLH10/89/90 and rice EAT1,was proposed to be the candidate gene of MS32 because it contained a single nucleotide polymorphism(SNP)that led to the formation of a premature stop codon.A codominant derived cleaved amplified polymorphic sequence(dCAPS)marker,MS32D,was developed based on the SNP.Real-time quantitative reverse-transcription PCR showed that most of the genes,which were proposed to be involved in pollen and tapetum development in tomato,were downregulated in the ms32 mutant.These findings may aid in marker-assisted selection of ms32 in hybrid breeding programs and facilitate studies on the regulatory mechanisms of pollen and tapetum development in tomato. | Xiaoyan Liu Mengxia Yang Xiaolin Liu Kai Wei Xue Cao Xiaotian Wang Xiaoxuan Wang Yanmei Guo Yongchen Du Junming Li Lei Liu Jinshuai Shu Yong Qin Zejun Huang | 2019 | Horticulture Research2019，6，1： | 3 |
| 11 | Bilinear approach to N=2 supersymmetric KdV equations显示文摘The N=2 supersymmetric KdV equations are studied within the framework of Hirota bilinear method. For two such equations, namely N=2, a=4 and N=2, a=1 supersymmetric KdV equations, we obtain the corresponding bilinear formulations. Using them, we construct particular solutions for both cases. In particular, a bilinear Bcklund transformation is given for the N=2, a=1 supersymmetric KdV equation. | ZHANG MengXia LIU QingPing SHEN YaLi WU Ke | 2009 | Science China Mathematics2009，52，9： | 2 |
| 12 | Composite thermal protection coating on woven silica fiber fabrics显示文摘A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber fabrics.Using a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,respectively.The phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetry/thermogravimetry,scanning electron microscopy,and tensile strength testing.Mullite whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification processes.The hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics. | LIU MengXia XUE Tao ZHAO YingNa LIU Shan LIU JiaChen | 2014 | Science China(Technological Sciences)2014，57，6： | 2 |
| 13 | Comparison of the interface reaction behaviors of CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) solid-state systems based on the diffusion couple method显示文摘The formation mechanism of calcium vanadate and manganese vanadate and the difference between calcium and manganese in the reaction with vanadium are basic issues in the calcification roasting and manganese roasting process with vanadium slag.In this work,CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion couples were prepared and roasted for different time periods to illustrate and compare the diffusion reaction mechanisms.Then,the changes in the diffusion product and diffusion coefficient were investigated and calculated based on scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) analysis.Results show that with the extension of the roasting time,the diffusion reaction gradually proceeds among the CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion couples.The regional boundaries of calcium and vanadium are easily identifiable for the CaO–V_(2)O_(5) diffusion couple.Meanwhile,for the MnO_(2)–V_(2)O_(5) diffusion couple,MnO_(2) gradually decomposes to form Mn_(2)O_(3),and vanadium diffuses into the interior of Mn_(2)O_(3).Only a part of vanadium combines with manganese to form the diffusion production layer.CaV_(2)O_(6) and MnV_(2)O_(6) are the interfacial reaction products of the CaO–V_(2)O_(5) and MnO_(2)–V_(2)O_(5) diffusion couples,respectively,whose thicknesses are 39.85 and 32.13μm when roasted for 16 h.After 16 h,both diffusion couples reach the reaction equilibrium due to the limitation of diffusion.The diffusion coefficient of the CaO–V_(2)O_(5) diffusion couple is higher than that of the MnO_(2)–V_(2)O_(5) diffusion couple for the same roasting time,and the diffusion reaction between vanadium and calcium is easier than that between vanadium and manganese. | Jing Wen Hongyan Sun Tao Jiang Bojian Chen Fangfang Li Mengxia Liu | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，5： | 2 |
| 14 | Characteristics of N^(6)-methyladenosine Modification During Sexual Reproduction of Chlamydomonas reinhardtii显示文摘The unicellular green alga Chlamydomonas reinhardtii(hereafter Chlamydomonas)possesses both plant and animal attributes,and it is an ideal model organism for studying fundamental processes such as photosynthesis,sexual reproduction,and life cycle.N^(6)-methyladenosine(m^(6)A)is the most prevalent mRNA modification,and it plays important roles during sexual reproduction in animals and plants.However,the pattern and function of m^(6)A modification during the sexual reproduction of Chlamydomonas remain unknown.Here,we performed transcriptome and methylated RNA immunoprecipitation sequencing(MeRIP-seq)analyses on six samples from different stages during sexual reproduction of the Chlamydomonas life cycle.The results show that m^(6)A modification frequently occurs at the main motif of DRAC(D=G/A/U,R=A/G)in Chlamydomonas mRNAs.Moreover,m^(6)A peaks in Chlamydomonas mRNAs are mainly enriched in the 30 untranslated regions(30 UTRs)and negatively correlated with the abundance of transcripts at each stage.In particular,there is a significant negative correlation between the expression levels and the m^(6)A levels of genes involved in the microtubule-associated pathway,indicating that m^(6)A modification influences the sexual reproduction and the life cycle of Chlamydomonas by regulating microtubule-based movement.In summary,our findings are the first to demonstrate the distribution and the functions of m^(6)A modification in Chlamydomonas mRNAs and provide new evolutionary insights into m^(6)A modification in the process of sexual reproduction in other plant organisms. | Ying Lv Fei Han Mengxia Liu Ting Zhang Guanshen Cui Jiaojiao Wang Ying Yang Yun-Gui Yang Wenqiang Yang | 2023 | Genomics, Proteomics & Bioinformatics2023，21，4： | 2 |
| 15 | SARS-CoV-2 Omicron RBD shows weaker binding affinity than the currently dominant Delta variant to human ACE2显示文摘Dear Editor,SARS-coronavirus-2(SARS-CoV-2)Omicron variant(B.1.1.529)is of great concern to the world due to its multiple mutations that may have an impact on transmissibility and immune evasion.1 Compared to the wild type(WT),Omicron carries as many as 30 single point mutations,3 deletion mutation and one insertion mutation on its spike protein.Strikingly,there are 15 mutations observed in the Omicron receptor-binding domain(RBD),10 of which are in the receptor-binding motif(RBM)that human angiotensin-converting enzyme 2(ACE2)and most monoclonal antibodies(mAbs)interact directly with.As a comparison,the currently dominant variant Delta(B.1.617.2)has only 2 mutations(L452R and T478K)in its RBM and additional K417N and E484K mutations sometimes.Therefore,Omicron variant may significantly impact the binding affinity to ACE2 and effectiveness of currently available mAbs.Consequently,Omicron mutant has aroused wide concern,many countries have taken measures on entry restrictions to prevent its rapid spread.However,the transmissibility and immune evasion risk of Omicron have not been properly evaluated. | Leyun Wu Liping Zhou Mengxia Mo Tingting Liu Chengkun Wu Chunye Gong Kai Lu Likun Gong Weiliang Zhu Zhijian Xu | 2022 | Signal Transduction and Targeted Therapy2022，7，2： | 2 |
| 16 | Agricultural soil monitoring of PCDD/Fs in the vicinity of a municipal solid waste incinerator in Eastern China:Temporal variations and possible sources显示文摘 | Xu Mengxia Yan Jianhua Lu Shengyong | 2009 | Journal of Hazardous Materials2009，166，： | 1 |
| 17 | L- Proline in an ionic liquid as an efficient and reusable catalyst for direct asymmetric -aminoxylation ofaldehydes and ketones显示文摘 | Guo Haiming Niu Hongying Xue Mengxia | 2006 | Green Chemistry2006，8，： | 1 |
| 18 | In-Situ Synthesis of CQDs/BiOBr Material via Mechanical Ball Milling with Enhanced Photocatalytic Performances显示文摘Designing simple, efficient, and environmentally friendly methods to construct high-efficient photocatalysts is an important strategy to promote the further development of the field of photocatalysis. Herein, flower-like carbon quantum dots(CQDs)/Bi OBr composite photocatalysts have been prepared via in-situ synthesis by mechanical ball milling in the existence of ionic liquid. The CQDs/Bi OBr composites exhibit higher photo-degradation performance for tetracycline(TC) than Bi OBr monomer and the commercial Bi_(2)O_(3) under visible light irradiation. For comparison, the different Br sources and synthetic methods are chosen to prepare Bi OBr and CQDs/Bi OBr composites. Photocatalysts prepared by ball milling and ionic liquid present significantly enhanced photocatalytic performance for removing TC. In addition, the introduction of CQDs could distinctly enhance the photocatalytic performances of pure Bi OBr. The reason is that CQDs as electron acceptor effectively separate electrons and holes and inhibit their recombination. The intermediates during photocatalytic degradation were tested using liquid chromatography-mass spectrometry(LC-MS) and possible degradation pathways were given. During degradation, ·OH, O_(2)^(·-)and h^(+) were identified to be the main active species based on electron spin resonance(ESR) spectra and free radical trapping experiments. A possible mechanism of CQDs/Bi OBr with enhanced photocatalytic performances was further proposed. | Xingwang Yan Bin Wang Mengxia Ji Qi Jiang Gaopeng Liu Pengjun Liu Sheng Yin Huaming Li Jiexiang Xia | 2022 | Chinese Journal of Structural Chemistry2022，41，8： | 1 |
| 19 | Vect0r-based Apel small interfering RNA enhances the sensitivity of human osteosarcoma ceils to endostatin in vivo显示文摘 | Wang Dong Zhong Zha~yang Li Mengxia | 2007 | Cancer Sci2007，98，12： | 1 |
| 20 | The influence of TiN content on erosion–corrosion behavior of Ti(C,N)-based cermets显示文摘 | Mengxia Liang Ji Xiong Zhixing Guo Weicai Wan Guangbiao Dong | 2013 | International Journal of Refractory Metals and Hard Materials2013，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员