检索结果-南通市图书馆

Distribution patterns and industry planning of commonly used traditional chinese medicinal plants in China

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2022年第3期44卷 255-261页

作者： Zhang-Jian Shan Jian-Fei Ye Da-Cheng Hao Pei-Gen Xiao Zhi-Duan Chen An-Ming Lu State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China University of chinese academy of sciences Beijing 100049China China National Botanical Garden Beijing 100093China Biotechnology Institute School of Environment and Chemical EngineeringDalian Jiaotong UniversityDalian 116028China Institute of Medicinal Plant Development Chinese Academy of Medical SciencesBeijing 100193China

Medicinal plants are the primary material basis for disease prevention and treatment in traditional chinese medicine(TCM).The conservation and sustainable utilization of these medicinal plants is critical for the development of the TCM ***,wild medicinal plant resources have sharply declined in recent *** ameliorate the shortage of medicinal plant resources,it is essential to explore the development potential of the TCM industry in different geographical *** this purpose,we examined the spatial distribution of commonly used medicinal plants in China,the number of chinese medicinal material markets,and the number of TCM decoction piece ***,multispecies superimposition analysis and Thiessen polygons were used to reveal the optimal range for planting bulk medicinal plants and the ideal regions for building chinese medicinal material markets,***,we quantitatively analyzed mismatches between the spatial distribution of commonly used medicinal plant richness,chinese medicinal material markets,and TCM decoction piece *** found that the areas suitable for growing commonly used medicinal plants in China were mainly distributed in Hengduan Mountain,Nanling Mountain,Wuling Mountain,and Daba Mountain *** Thiessen polygon network based on chinese medicinal material market localities showed there are currently fewer markets in southwestern,northwestern,and northeastern China than in central and southern *** decoction piece enterprises are concentrated in a few provinces,such as Hebei and *** found that the distribution of commonly used medicinal plants,chinese medicinal material markets and TCM decoction piece enterprises are mismatched in Henan,Shaanxi,Hunan,Hubei,Zhejiang,Fujian,Chongqing,and *** recommend strengthening development of the TCM industry in Henan,Hunan,Zhejiang,Shaanxi,Hubei,Chongqing,Fujian,and Xizang;building more chinese medicinal material markets in southw

关键词： Medicinal plant Distribution pattern Traditional chinese medicine industry Thiessen polygon

A pH-regulated stimuli-responsive strategy for RNA-cleaving DNAzyme

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第3期63卷 404-410页

作者： Shasha Lu Shuang Wang Jiahui Zhao Jian Sun Xiurong Yang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Science and Technology of China Hefei 230026China University of chinese academy of sciences Beijing 100049China

RNA-cleaving DNAzymes possess important roles in DNAzymes and have been widely used in the biosensors,DNA nanomachines owing to their ion-specific ***,there are still challenges in constructing universal but versatile stimuli-responsive strategies of RNA-cleaving ***,a stimuli-responsive strategy for RNA-cleaving DNAzyme is proposed by the artful design of hairpin nanostructure,in which the activities of DNAzyme(Pb2+-dependent DNAzyme as a model)in the hairpin’s loop are p H-regulated by using the triplex stem as the"lock".Upon introducing the"key",p H values,the DNAzyme will be activated and fragment the substrate of it in the presence of Pb2+,accompanied by the turn-on of the fluorescence quenched by fluorescence resonance energy transfer(FRET).The regulation ability of p H can be controlled by the length and sequence of the triplex stem,and the wide p H regulation range may be helpful for the application of DNAzymes in biological medicine delivery systems.

关键词： DNAzymes hairpin nanostructure triplex pH Pb2+ FRET

Vacuum current-carrying tribological behavior of MoS2-Ti films with different conductivities

在线全文

学校读者我要写书评

暂无评论

chinese Physics B 2022年第6期31卷 563-571页

作者： Lu-Lu Pei Peng-Fei Ju Li Ji Hong-Xuan Li Xiao-Hong Liu Hui-Di Zhou Jian-Min Chen Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Aerospace Equipment Manufacture Shanghai 200245China

Current-carrying sliding is widely applied in aerospace equipment,but it is limited by the poor lubricity of the present materials and the unclear tribological *** study demonstrated the potential of MoS_(2)-based materials with excellent lubricity as space sliding electrical contact materials by doping Ti to improve its *** tribological behavior of MoS_(2)-Ti films under current-carrying sliding in vacuum was studied by establishing a simulation evaluating ***,the noncurrent-carrying sliding and static current-carrying experiments in vacuum were carried out for comparison to understand the tribological *** addition to mechanical wear,the current-induced arc erosion and thermal effect take important roles in accelerating the *** erosion is caused by the accumulation of electric charge,which is related to the conductivity of the *** the current-thermal effect softens the film,causing strong adhesive wear,and good conductivity and the large contact area are beneficial for minimizing the thermal *** the moderate hardness and good conductivity of MoS_(2)-Ti film contribute to its excellent current-carrying tribological behavior in vacuum,showing a significant advantage compared with the traditional ones.

关键词： MoS2-Ti films conductivity current-carrying tribological behavior vacuum

Effects of chemical energy accommodation on nonequilibrium flow and heat transfer to a catalytic wall

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Aeronautics 2022年第10期35卷 165-175页

作者： Shunliang ZHANG Zhihui WANG School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

The accurate prediction of the aeroheating performance of hypersonic vehicles requires more detailed modeling of the catalysis process,rather than merely employing a catalytic *** this paper,the theoretical modeling,as well as the direct simulation Monte Carlo method,is used to preliminarily study the incomplete chemical energy accommodation effects,that is,only a part of the potential energy released in the heterogenous recombination reaction is transferred to the surface,while the remaining is retained as the vibrational energy of the desorbed *** integrated model is proposed to describe the contribution of each energy mode in the rarefied nonequilibrium heat and mass transfer *** on the model and several Damko?hler numbers,an analytical formula is derived,and is also shown to compare well with the numerical *** account of the incomplete accommodations of the chemical and vibrational energy on the wall,a variation up to 20%is observed in predicting the stagnation point heat flux under typical nonequilibrium flow *** study could enrich our understanding of the nonequilibrium heat transfer phenomenon and also shows a potential practical value.

关键词： Catalytic reaction Energy accommodation Heat transfer Nonequilibrium flow Stagnation point

“Nanocompoundsite”:Nano phased polymer dispersed in inorganic matrix via covalent bonds

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第7期15卷 6582-6589页

作者： Xiang Guo Pengfei Li Guoming Liu Ye Tian Zongbo Zhang Caihong Xu Lei Jiang CAS Key Laboratory of Science and Technology on High-tech Polymer Materials Institute of ChemistryChinese Academy of Sciences(ICCAS)Beijing 100190China University of chinese academy of sciences(UCAS) Beijing 100049China CAS Key Laboratory of Engineering Plastics Institute of ChemistryChinese Academy of Sciences(ICCAS)Beijing 100190China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of Sciences(TIPCCAS)Beijing 100190China Research Institute for Frontier Science Beihang UniversityBeijing 100191China

Herein we demonstrate a new strategy to construct inorganic–organic“nanocompoundsite”,i.e.,a material that nano phased polymer is dispersed in consecutive inorganic matrix via covalent bonds,which is different from the conventional nanocomposite with polymer as matrix and inorganic nanomaterials as dispersed *** a representative system,SiOx/polydimethylsiloxane(PDMS)nanocompoundsite was prepared from a polymeric precursor of perhydropolysilazane(PHPS)modified by carbohydroxyl end-capped PDMS(HOC-PDMS),through a room-temperature vacuum ultraviolet(VUV)irradiation *** adjusting HOC-PDMS/PHPS ratio below 20%,PDMS fully binds to the PHPS derived SiOx matrix via Si-O-C bond to form the inorganic-organic SiOx/PDMS nanocompoundsite(ISPN)without noticeable phase *** introduction of PDMS into ISPN renders its initial decomposition temperature increase over 110℃.The remarkable enhancement of thermal stability for PDMS is due to the restriction of terminal hydroxyl induced back-biting reaction and main chain degradation by the inorganic matrix and the covalent binding between PDMS and *** novel strategy can further extend to hydroxyl terminated PDMS,polyethylene glycol,and acrylic resin,with the initial decomposition temperature of each polymer increasing by over 110,150 and 100℃,*** importantly,the nanocompoundsite combines the characteristics of inorganic matrix and *** coating based on SiOx/PDMS nanocompoundsite exhibits good flexibility,outstanding interfacial binding strength,ultra-high hardness as well as excellent hydrophobicity.

关键词： nanocomposite nanocompoundsite inorganic-organic molecular-level confinement thermal stability

Wide-field auroral imager onboard the Fengyun satellite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2019年第1期8卷 776-787页

作者： Xiao-Xin Zhang Bo Chen Fei He Ke-Fei Song Ling-Ping He Shi-Jie Liu Quan-Feng Guo Jia-Wei Li Xiao-Dong Wang Hong-Ji Zhang Hai-Feng Wang Zhen-Wei Han Liang Sun Pei-Jie Zhang Shuang Dai Guang-Xing Ding Li-Heng Chen Zhong-Su Wang Guang-Wei Shi Xin Zhang Chao Yu Zhong-Dong Yang Peng Zhang Jin-Song Wang National Satellite Meteorological Center China Meteorological AdministrationBeijingChina Key Laboratory of Space Weather National Center for Space WeatherChina Meteorological AdministrationBeijingChina Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina State Key Laboratory of Applied Optics Chinese Academy of SciencesChangchunChina Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina Institutions of Earth Science Chinese Academy of SciencesBeijingChina

The newly launched Fengyun-3D(FY-3D)satellite carried a wide-field auroral imager(WAI)that was developed by Changchun Institute of Optics,Fine Mechanics and Physics,chinese academy of sciences(CIOMP),which will provide a large field of view(FOV),high spatial resolution,and broadband ultraviolet images of the aurora and the ionosphere by imaging the N2 LBH bands of *** WAI consists of two identical cameras,each with an FOV of 68°in the along-track direction and 10°in the cross-track *** two cameras are tilted relative to each other to cover a fan-shaped field of size 130°×10°.Each camera consists of an unobstructed four-mirror anastigmatic optical system,a BaF2 filter,and a photon-counting imaging *** spatial resolution of WAI is ~10 km at the nadir point at a reference height of 110 km above the Earth’s *** sensitivity is>0.01 counts s^(−1) Rayleigh^(−1) pixel^(−1)(140-180 nm)for both cameras,which is sufficient for mapping the boundaries and the fine structures of the auroral oval during storms/*** on the tests and calibrations that were conducted prior to launch,the data processing algorithm includes photon signal decoding,geometric distortion correction,photometric correction,flatfield correction,line-of-sight projection and correction,and normalization between the two *** processed images are compared with DMSP SSUSI *** agreement between the images that were captured by two instruments demonstrates that the WAI and the data processing algorithm operate normally and can provide high-quality scientific data for future studies on auroral dynamics.

关键词： storm correction field

Long-term adaptive evolution of Shewanella oneidensis MR-1 for establishment of high concentration Cr(Ⅵ) tolerance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第1期14卷 65-75页

作者： Yong Xiao Changye Xiao Feng Zhao CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of chinese academy of sciences Beijing 100049China

Acclimation is the main method to enhance the productivity of microorganisms in environmental biotechnology,but it remains uncertain how microorganisms acquire resistance to high concentrations of pollutants during long-term *** oneidensis MR-1 was acclimated for 120 days with increasing hexavalent chromium(Cr(VI))concentrations from 10 to 190 mg/*** bacterium was able to survive from the highly toxic Cr(VI)environment due to its enhanced capability to reduce Cr(VI)and the increased cell membrane *** sequenced 19 complete genomes from 7 populations of MR-1,including the ancestral strain,the evolved strains in Cr(VI)environment on days 40,80 and 120 and their corresponding controls.A total of 27,49 and 90 single nucleotide polymorphisms were found in the Cr(VI)-evolved populations on days 40,80 and 120,*** substitutions were clustered according to gene functions,and the gene mutations related to integral components of the membrane,including efflux pumps and transporters,were the key determinants of chromate *** addition,MR-1 strengthened the detoxification of Cr(VI)through gene variations involved in adenosine triphosphate binding,electron carrier activity,signal transduction and DNA *** results provide an in-depth analysis of how Cr(VI)resistance of *** MR-1 is improved by acclimation,as well as a genetic understanding of the impact of longterm exposure of microorganisms to pollution.

关键词： Environmental biotechnology Acclimation Chromate resistance Efflux pumps Detoxification

Quantum confinement of carriers in the type-I quantum wells structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Physics B 2024年第9期33卷 553-558页

作者： Xinxin Li Zhen Deng Yang Jiang Chunhua Du Haiqiang Jia Wenxin Wang Hong Chen Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials andDevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChineseAcademy of SciencesBeijing 100190China Center of Materials and Optoelectronics Engineering University of Chinese Academy ofSciencesBeijing 100049China The Yangtze River Delta Physics Research Center Liyang 213000China Songshan Lake Materials Laboratory Dongguan 523808China

Quantum confinement is recognized to be an inherent property in low-dimensional ***,it is believed that the carriers trapped within the well cannot escape due to the discrete energy ***,our previous research has revealed efficient carrier escape in low-dimensional structures,contradicting this conventional *** this study,we review the energy band structure of quantum wells along the growth direction considering it as a superposition of the bulk material dispersion and quantization energy dispersion resulting from the quantum confinement across the whole Brillouin *** accounting for all wave vectors,we obtain a certain distribution of carrier energy at each quantized energy level,giving rise to the energy *** results enable carriers to escape from the well under the influence of an electric ***,we have compiled a comprehensive summary of various energy band scenarios in quantum well structures relevant to carrier *** a new interpretation holds significant value in deepening our comprehension of low-dimensional energy bands,discovering new physical phenomena,and designing novel devices with superior performance.

关键词： energy band quantum confinement type-I quantum wells low-dimensional structures

Intrinsically Anti-Flammable Apigenin-derived Epoxy Thermosets with High Glass Transition Temperature and Mechanical Strength

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Polymer Science 2022年第10期40卷 1259-1268,I0011页

作者： Hafezeh Nabipour Xin Wang Lei Song Yuan Hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

In this work,apigenin was chosen as a raw material to synthesize a novel epoxy monomer(DGEA),while the bio-based epoxy resin was further obtained after curing with 4,4’-diaminodiphenylmethane(DDM).The control samples were prepared by curing diglycidyl ether of bisphenol A(DGEBA)with *** non-isothermal differential scanning calorimeter(DSC)method was utilized to further investigate the curing behavior and curing kinetics of the DGEA/DDM *** no flame retardant active elements,the DGEA/DDM thermoset still exhibited exceptional ***,the DGEA/DDM thermoset reached a V-0 rating in the UL-94 test and owned a high limiting oxygen index(LOI)value of 37.0%,while DGEBA/DDM resins were consumed completely in the vertical combustion test with a low LOI of 23.0%.Furthermore,the microscale combustion calorimetry(MCC)results manifested that compared with DGEBA/DDM resins,both PHRR and THR values of the DGEA/DDM resins were dropped by 84.0%and 57.6%,***,the DGEA/DDM resin also presented higher storage modulus and tensile strength compared with DGEBA/DDM ***,in contrast with that of the cured DGEBA/DDM one(156℃),the DGEA/DDM thermoset displayed an extremely high glass transition temperature(232℃).This study breaks new ground on how to produce biobased monomers with aromatic structures and achieve high-performance thermosetting polymers.

关键词： Bio-based epoxy thermosets Apigenin Intrinsic anti-flammability