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38篇 您的检索式:作者名="Xiangxin Li"
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1Cloning of 9-cis-epoxycarotenoid dioxygenase (NCED) gene encoding a key enzyme during abscisic acid (ABA) biosynthesis and ABA-regulated ethylene production in detached young persimmon calyx显示文摘Unlike the typical climacteric fruits, persimmons (Diospyros kaki Thunb.) produce higher levels of ethylene when they are detached from trees at a younger stage. In order to obtain detailed information on the role of abscisic acid (ABA) in ripening, we cloned the DKNCED1, DKACS2, and DKACO1 genes from the calyx. Water loss was first noted in the calyx lobe, and DKNCED1 was highly expressed 1 d after the fruits were detached, coinciding with an increase in the ABA content. Then, the DKACS2 and DKACO1 genes were expressed after some delay. In the calyx, the ABA peak was observed 2 d after the fruits were harvested, and this peak preceded the ethylene peak observed on day 3. The fruit firmness rapidly decreased on day 4, and the fruits softened completely 6 d after they were harvested. The increases in the expressions of ABA, ethylene, and the genes in the calyxes occurred earlier than the corresponding increases in the pulp, although the 3 increases occurred on different days. Exogenous ABA treatment increased ABA concentration, induced expression of both ACS and ACO, and promoted ethylene synthesis and young-fruit softening; by contrast, treatment with NDGA inhibited the gene expressions and ethylene synthesis and delayed young-fruit softening. These results indicate that ethylene biosynthesis in the detached young persimmon fruits is initially triggered by ABA, which is induced by water loss in the calyx, through the induction of DKACS2 and DKACO1 expressions. The ethylene produced in the calyx subsequently diffuses into the pulp tissue, where it induces autocatalytic ethylene biosynthesis, resulting in an abrupt increase in ethylene production.LENG Ping ZHANG GuangLian LI XiangXin WANG LiangHe ZHENG ZhongMing 2009Chinese Science Bulletin2009,54,16:13
2A novel true triaxial test system for microwave-induced fracturing of hard rocks显示文摘This study introduces a test system for microwave-induced fracturing of hard rocks under true triaxial stress.The test system comprises a true triaxial stress loading system,an open-ended microwaveinduced fracturing system,a data acquisition system,an acoustic emission(AE)monitoring system,and an auxiliary specimen loading system.Microwave-induced surface and borehole fracturing tests under true triaxial stress were fulfilled for the first time,which overcomes the problem of microwave leakage in the coupling loading of true triaxial stress and microwave.By developing the dynamic monitoring system,the thermal response and fracture evolution were obtained during microwave irradiation.The monitoring system includes the infrared thermometry technique for monitoring rock surface temperature,the distributed optic fiber sensing technique for monitoring temperature in borehole in rock,the AE technique and two-dimensional digital speckle correlation technique for monitoring the evolution of thermal damage and the rock fracturing process.To validate the advantages of the test system and investigate the characteristics of microwave-induced fracturing of hard rocks,the study demonstrates the experimental methods and results for microwave-induced surface and borehole fracturing under true triaxial stress.The results show that thermal cracking presented intermittent characteristics(calm eactiveecalm)during microwave-induced surface and borehole fracturing of basalt.In addition,true triaxial stress can inhibit the development and distribution of thermal cracks during microwave-induced surface fracturing.When microwave-induced borehole fracturing occurs,it promotes the distribution of thermal cracks in rock,but inhibits the width of cracks.The results also prove the reliability of the test system.Xia-Ting Feng Jiuyu Zhang Chengxiang Yang Jun Tian Feng Lin Shiping Li Xiangxin Su 2021Journal of Rock Mechanics and Geotechnical Engineering2021,13,5:5
3Effects of grazing disturbance of spatial distribution pattern and interspecies relationship of two desert shrubs显示文摘Grazing significantly affects the distribution,growth,and productivity of shrubs.In this study,we evalu-ated the effects of grazing disturbance on the spatial distri-bution patterns and interspecific relationships of two desert shrubs,Ammopiptanthus mongolicus and Sarcozygium xan-thoxylon.Three types of grazing conditions were considered,including enclosed area(EA),seasonal rotational grazing area(SRGA),and grazing area(GA)(100 m×100 m),in the West Ordos Nature Reserve of Inner Mongolia,China.The results showed that A.mongolicus and S.xanthoxylon populations were uniformly distributed at a small scale,and the distribution in EA and SRGA became gradually ran-dom.In GA,A.mongolicus population showed aggregated distribution but S.xanthoxylon population showed random distribution at a small scale. Moreover, both A. mongolicus and S. xanthoxylon populations at the 5-7 m scale showed random distribution. At the small and intermediate scales, the two species showed positive interspecific relationships of GA. However, no interspecific relationship was noted between the two species in EA and SRGA. A significant positive relationship (P < 0.01) was noted between the two species at 2-9 m and a negative relationship (P < 0.01) at 13-17 m scales in GA. Positive relationship (P < 0.01) was noted between the two species at 6-13 m scales and a sig-nificant negative relationship (P < 0.01) at 14-24 m scales in SRGA. The two species of desert shrubs showed posi-tive interspecific relationships at the small scale, and they showed negative relationships as the interspecific compe-tition intensified in the presence of grazing disturbance. When the grazing intensity exceeds a certain threshold, the interspecific relationships become weak. Therefore, moder-ate grazing would facilitate interspecific competition and species succession, whereas excessive grazing would disrupt natural competition causing desertification ultimately.Lei Zhang Yong Gao Jinrong Li Chao Zhang Minyu Li Zhao Hu Xiangxin Cui 2022Journal of Forestry Research2022,33,2:3
4Dendrite-structured FeF_(2) consisting of closely linked nanoparticles as cathode for high-performance lithium-ion capacitors显示文摘Lithium-ion capacitors(LICs)are regarded as a good choice for next-generation energy storage devices,which are expected to exhibit high energy densities,high power densities,and ultra-long cycling stability.Nevertheless,only a few battery-type cathode materials with limited kinetic properties can be employed in LICs,and their electrochemical properties need to be optimized urgently.Here,we exploit a new dendrite-structured FeF_(2) consisting of closely linked primary nanoparticles using a facile solvothermal method combined with the subsequent annealing treatment.This particular architecture has favorable transport pathways for both lithium ions and electrons and exhibits an ultrafast chargedischarge capability with high reversible capacities.Furthermore,a well-designed LIC employing the prepared dendrite-structured FeF_(2) as the battery-type cathode and commercialized activated carbon(AC)as supercapacitor-type anode was constructed in an organic electrolyte containing Li ions.The LIC operates at an optimal voltage range of 1.1-3.8 V and shows a maximum high energy density of 152 W h kg^(-1) and a high power density of 4900 W kg^(-1) based on the total mass of cathode and anode.Long-term cycling stability(85%capacity retention after 2000 cycles)was achieved at 1 A g^(-1).This work suggests that the dendrite-structured FeF_(2) is a prime candidate for high-performance LICs and accelerates the development of hybrid ion capacitor devices.Huanyu Liang Zhengqiang Hu Zhongchen Zhao Dong Chen Hao Zhang Huaizhi Wang Xia Wang Qiang Li Xiangxin Guo Hongsen Li 2021Journal of Energy Chemistry2021,30,4:3
5Development Status and Research Progress in Rare Earth Hydrometallurgy in China显示文摘Characteristic and hydrometallurgy processes for Baotou mixed-type rare earth concentrate, bastnasite, and ionic adsorption deposit in China were reviewed. The R & D circumstance and new progresses in extraction and separation of RE element in China were introduced. Moreover, the development trend of RE hydrometallurgy was predicted. The direction and emphasised fields of research and development are also brought forward as: to R & D high efficient green progresses in hydrometallurgy and separation of RE ore, resolve the waste pollution problem of water, slagand gas, reduce the chemical material consumption and improve comprehensive efficiency of resources; to R & D preparation technology for RE compounds with ultra high-purity and special physical property for extending application fields of RE.Huang Xiaowei Li Hongwei Xue Xiangxin Zhang Guocheng 2006Journal of Rare Earths2006,24,2:2
6Effects of boron number per unit volume on the shielding properties of composites made with boron ores from China显示文摘The total macroscopic removal cross sections,deposited energies and the absorbed doses of three new shielding composites loaded with specific boron-rich slag,boron concentrate ore and boron mud of China for 252Cf neutron source were investigated by experimental and Monte Carlo calculation.The results were evaluated by boron mole numbers per unit volume in composites.The half value layers of the composites were calculated and compared with that of Portland concrete,indicating that ascending boron mole numbers per unit volume in the composites can enhance the shielding properties of the composites for 252Cf neutron source.LI Zhefu XUE Xiangxin LIU Sulan LI Yong DUAN Peining 2012Nuclear Science and Techniques2012,23,6:2
7Sandwiched N-carbon@Co_(9)S_(8)@Graphene nanosheets as high capacity anode for both half and full lithium-ion batteries显示文摘Transition metal sulfides(TMSs) are promising candidates for replacing graphite anode in LIBs. However,the low conductivity and structural collapse caused by the large volume change during lithium insertion and extraction greatly limit its application. Herein, we report a unique design of a two-dimensional(2 D) sandwich structure of N-doped carbon@Co9 S8@graphene(N–C@Co9 S8@G) with multilayer structure. Electrochemical tests reveal that the N–C@Co9 S8@G nanosheets possess a high reversible capacity(1009 mAhg^(-1) at 0.1 Ag^(-1)), and excellent rate capability(422mAhg^(-1) at 10 Ag^(-1)) and long cycle life(853 m Ahg^(-1) at 1Ag^(-1) for 500 cycles). Experimental studies reveal that capacitive storage contributes to the high reversible capacity. The lithium storage kinetics are studied by Galvanostatic intermittent titration technique(GITT) and electrochemical impedance spectroscopy(EIS). Meanwhile, the potential of N–C@Co9 S8@G anode in a full cell using Li Co O2 as the cathode is also demonstrated, exhibiting a high reversible capacity of 300mAhg^(-1) cycles at 0.1Ag^(-1). The strategy proposed in this work paves the way to engineering high performance anodes in LIBs.Ningning Li Li Sun Kai Wana Sheng Xu Jun Zhang Xiangxin Guo Xianghong Liu 2020Journal of Energy Chemistry2020,29,12:2
8Multilayered structure of N-carbonenvelopediron oxide/graphene nanocomposites as an improved anode for Li-ion battery显示文摘Transition metal oxides with high capacity are considered a promising electrode material for lithium-ion batteries(LIBs).Nevertheless,the huge volume expansion and poor conductivity severely hamper their practical application.In this work,a carbon riveting method is reported to address the above issues by designing multilayered N-doped carbon(N-carbon) enveloped Fe3O4/graphene nanosheets.When evaluated as a negative electrode,the N-carbon/Fe3O4/graphene nanocomposites demonstrate greatly enhanced electrochemical properties compared with Fe3O4/graphene.The N-carbon/Fe3O4/graphene presents a superior reversible capacity(807 mAh/g) over Fe3O4/graphene(540 mAh/g).Furthermore,it affords a considerable capacity of 550 mAh/g at 1 A/g over 700 cycles,indicating supe rb cycling stability.The structure-property correlation studies reveal that the carbon riveting layer is essential for enhancing the lithium diffusion kinetics.The good electrochemical properties and effective structure design make the carbon riveting strategy quite general and reliable to manipulate high performance electrodes for future LIBs.Li Sun Kai Wang Ningning Li Jun Zhang Xiangxin Guo Xianghong Liu 2020Chinese Chemical Letters2020,31,9:2
9Use of the Jiaolong manned submersible for accurate mapping of deep-sea topography and geomorphology显示文摘High-resolution bathymetric side-scan sonar(BSSS) performs the functions of traditional side-scan sonar, while also providing a depth-sounding function that allows simultaneous measurement of seafloor topography and geomorphology. Submarine microtopography and microgeomorphology detection ability and advanced underwater acoustic digital communication are important technical capabilities of the Jiaolong manned submersible. High resolution BSSS achieved accurate detection of seafloor topography and geomorphology at a depth of 7000 m, and successful mapping of local microtopography and microgeomorphology in the Mariana Trench.Tongwei ZHANG Jialing TANG Zhengguang LI Yubin ZHOU Xiangxin WANG 2018Science China Earth Sciences2018,61,8:2
10Cloning and functional analysis of 9-cis-epoxycarotenoid dioxygenase (NCED) genes encoding a key enzyme during abscisic acid biosynthesis from peach and grape fruits显示文摘Zhang Mei Leng Ping Zhang Guanglian Li Xiangxin 0,,:1
11CombinedFluidized Bed Retorting and Circulating Fluidized BedCombustion System of Oil Shale显示文摘HAN Xiangxin LI Qingyou NIU Mengting 2014Oil Shale2014,31,1:1
12Application of the en- tropy weight and TOPSIS method in safety evaluation of coal mines 显示文摘Li Xiangxin Wang Kongsen Liu Liwen 2011Procedia Engineering2011,26,3:1
13Etching-courtesy NH_(4)^(+) pre-intercalation enables highly-efficient Li^(+) storage of MXenes via the renaissance of interlayer redox显示文摘Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building,superior advantages are afforded via fabricating the NH_(4)+ions pre-intercalated Mo_(2)CT_(x) MXene(Mo_(2)CT_(x)-N)in a mixed solution of NH_(4)F and HCl via a simple one-step hydrothermal method.As a result of the synergistic effects of pillared structure,immobilizing-F groups and unlocking Mo-based redox,the Mo_(2)CT_(x)-N remarkably delivered a reversible capacity of 384.6 mAh ^(g-1) at 200 mA g^(-1) after 100 cycles.Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.Junyan Li Wei Zhang Xin Ge Ming Lu Xiangxin Xue Zizhun Wang Nailin Yue Junkai Zhang Xingyou Lang Qing Jiang Weitao Zheng 2022Journal of Energy Chemistry2022,31,9:1
14Tungsten oxide thin films for highly sensitive triethylamine detection显示文摘Metal oxide semiconductor(MOS)thin films are promising sensing layer for integration in gas sensor devices for detecting toxic and harmful molecules.Herein,tungsten oxide(WO_(3))thin films are deposited on interdigital electrodes by vacuum thermal evaporation to realize batch fabrication of high-performance gas sensors.Subsequent annealing at different temperatures allows for regulation of the concentration of oxygen vacancies in the WO_(3) films,which has been found to exert a great influence on the sensor properties.In addition,the surface structure of WO_(3) films is also highly dependent on the annealing temperature.Gas sensing investigations show that the WO_(3) sensor annealed at 500℃ pos-sesses the best sensing properties for detecting triethylamine(TEA)including very high response,good selectivity,fast response,and low limit of detection(63 ppb).The excellent sensor performances are attributed to the enhanced adsorption of oxidative oxygen species due to the presence of abundant oxygen vacancies.The scalable fabrication of WO_(3) thin film gas sensors and the oxygen vacancy engi-neering strategy proposed herein may shed some light to developing high performance environmental sensors.Guanglu Lei Zishuo Li Guocai Lu Jinyuan Hu Haochuan Shang Xiaolei Zhang Xianghong Liu Jun Zhang Xiangxin Guo 2022Journal of Materiomics2022,8,2:1
15Development of rare earth hydromet2 allurgy technology in China显示文摘Huang Xiaowei Long Zhiqi Li Hongwei Ying Wei juan Zhang Guocheng Xue Xiangxin 0,,01:1
16Cloning and functional analysis of 9- cis -epoxycarotenoid dioxygenase (NCED) genes encoding a key enzyme during abscisic acid biosynthesis from peach and grape fruits显示文摘Mei Zhang Ping Leng Guanglian Zhang Xiangxin Li 2009Journal of Plant Physiology2009,,12:1
17Visible transparent,infrared stealthy polymeric films with nanocoating of ITO@MXene enable efficient passive radiative heating and solar/electric thermal conversion显示文摘Visible transparent yet low infrared-emissivity(ε)polymeric materials are highly anticipated in many applications,whereas the fabrication of which remains a formidable challenge.Herein,visible transparent,flexible,and low-εpolymeric films were fabricated by nanocoating decoration of indium tin oxide(ITO)and MXene on polyethylene terephthalate(PET)film surface through magnetron sputtering and spray coating,respectively.The obtained PET-ITO@MXene(PET-IM)film exhibits lowεof 24.7%and high visible transmittance exceeding 50%,endowing it with excellent visible transparent infrared stealthy by reducing human skin radiation temperature from 32 to 20.8°C,and remarkable zero-energy passive radiative heating capability(5.7°C).Meanwhile,the transparent low-εPET-IM film has high solar absorptivity and electrical conductivity,enabling superior solar/electric to thermal conversion performance.Notably,the three heating modes of passive radiative and active solar/electric can be integrated together to cope with complex heating scenarios.These visible transparent low-εpolymeric films are highly promising in infrared stealth,building daylighting and thermal management,and personal precision heating.Xingyuan Du Xiangxin Li Yuxuan Zhang Xinyi Guo Zhengji Li Yanxia Cao Yanyu Yang Wanjie Wang Jianfeng Wang 2023Nano Research2023,16,2:1
18Genipin- crosslinked electrospun chitosan nanofibers: Determination of crosslinking conditions and evaluation of cytocompatibility 显示文摘LI Qin WANG Xianliu LOU Xiangxin 2015Carbohydr Polym2015,130,2015:1
19Polydopamine-mediated synthesis of Si@carbon@graphene aerogels for enhanced lithium storage with long cycle life显示文摘The application of Si as the anode materials for lithium-ion batteries(LIBs) is still severely hindered by the rapid capacity decay due to the structural damage caused by large volume change(> 300%) during cycling. Herein, a three-dimensional(3 D) aerogel anode of Si@carbon@graphene(SCG) is rationally constructed via a polydopamine-assisted strategy. Polydopamine is coated on Si nanoparticles to serve as an interface linker to initiate the assembly of Si and graphene oxide, which plays a crucial role in the successful fabrication of SCG aerogels. After annealing the polydopamine is converted into N-doped carbon(N-carbon) coatings to protect Si materials. The dual protection from N-carbon and graphene aerogels synergistically improves the structural stability and electronic conductivity of Si, thereby leading to the significantly improved lithium storage properties. Electrochemical tests show that the SCG with optimized graphene content delivers a high capacity(712 m Ah/g at 100 m A/g) and robust cycling stability(402 m Ah/g at 1 A/g after 1500 cycles). Furthermore, the full cell using SCG aerogels as anode exhibits a reversible capacity of 187.6 m Ah/g after 80 cycles at 0.1 A/g. This work provides a plausible strategy for developing Si anode in LIBs.Ningning Li Yi Liu Xiaoyu Ji Jiaxin Feng Kai Wang Jiayue Xie Guanglu Lei Xianghong Liu Xiangxin Guo Jun Zhang 2021Chinese Chemical Letters2021,32,12:1
20GABAA receptor overexpression in the lateral hypothalamic area attenuatesgastric ischemia?reperfusion injury in rats显示文摘Lin Gao Tao Zhu Guilin Xie Xiangxin Lou Shibao Li Yan Zhou Zhenxu Deng Dechang Chu Jiyu Lou Dongshu Du 2015Molecular Medicine Reports2015,,2:1
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