检索结果-南通市图书馆

Correlation and Pathway Analysis of the Carbon,Nitrogen,and Phosphorus in Soil-Microorganism-Plant with Main Quality Components of Tea(Camellia sinensis)

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第3期93卷 487-502页

作者： Chun Mao Ji He Xuefeng Wen yangzhou Xiang Jihong Feng Yingge Shu College of Agriculture Guizhou UniversityGuiyangChina school of Geography and Resources Guizhou Education UniversityGuiyangChina

The contents of carbon(C),nitrogen(N),and phosphorus(P)in soil-microorganisms-plant signiﬁcantly affect tea quality by altering the main quality components of tea,such as tea polyphenols,amino acids,and ***,few studies have quantiﬁed the effects of these factors on the main quality components of *** study aimed to explore the interactions of C,N,and P in soil-microorganisms-plants and the effects of these factors on the main quality components of tea by using the path analysis *** results indicated that(1)The contents of C,N,and P in soil,microorganisms,and tea plants were highly correlated and collinear,and showed signiﬁcant correlations with the main quality components of tea.(2)Optimal regression equations were established to esti-mate tea polyphenol,amino acid,catechin,caffeine,and water extract content based on C,N,and P contents in soil,microorganisms,and tea plants(R^(2)=0.923,0.726,0.954,0.848,and 0.883,respectively).(3)Pathway analysis showed that microbial biomass phosphorus(MBP),root phosphorus,branch nitrogen,and microbial biomass carbon(MBC)were the largest direct impact factors on tea polyphenol,catechin,water extracts,amino acid,and caffeine content,*** carbon,root phosphorus,and leaf nitrogen were the largest indirect impact factors on tea polyphenol,catechin,and water extract content,*** carbon indirectly affected tea polyphenol content mainly by altering MBP *** phosphorus indirectly affected catechin content mainly by altering soil organic carbon *** nitrogen indirectly affected water extract content mainly by altering branch nitrogen *** research results provide the scientiﬁc basis for reasonable fertilization in tea gardens and tea quality improvement.

关键词： Soil-microorganisms-plant system carbon nitrogen phosphorus tea quality path analysis

Mapping and resource evaluation of deep high-temperature geothermal resources in the Jiyang Depression,china

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

Energy Geoscience

Energy Geoscience 2024年第4期5卷 142-155页

作者： Shaozheng Wang Yaoqi Zhou Xin Zhang yangzhou Wang Yonghong Yang Yuehan Shang Yang Chen Xiaoxin Shi school of Geosciences China University of Petroleum(East China)QingdaoShandong266580China Shandong Energy Group Co. Ltd.JinanShandong250101China Research Institute of Petroleum Exploration and Developement Shengli OilfieldDongyingShandong257000China

In china,geothermal resource utilization has mainly focused on resources at shallow and medium ***,the exploration of deep,high-temperature geothermal resources holds significant importance for achieving the“dual carbon”goals and the transition of energy *** Jiyang Depression in the Bohai Bay Basin has vast potential for deep,high-temperature geothermal *** analyzing data from 2187 wells with temperature logs and 270 locations for temperature measurement in deep strata,we mapped the geothermal field of shallow to medium-deep layers in the Jiyang Depression using ArcGIS and predicted the temperatures of deep layers with a burial depth of 4000 *** stochastic modeling and numerical simulation,a reservoir attribute parameter database for favorable deep,high-temperature geothermal areas was developed,systematically characterizing the spatial distribution of geothermal resources within a play fairway of 139.5 km2 and estimating the exploitable deep geothermal resource potential by using the heat storage method and Monte Carlo data *** study reveals that the Fan 54 well block in the Boxing-Jijia region is of prime significance to develop deep,high-temperature geothermal resources in the Jiyang *** from the Cenozoic to the Upper Paleozoic are identified as effective cap layers for these deep geothermal *** Lower Paleozoic capable of effectively storing thermal energy and possessing an exploitable resource volume up to 127 million tons of standard coal,is identified as a target system for the development of deep high-temperature geothermal resources,providing significant insights for the efficient development of geothermal resources in the Jiyang Depression.

关键词： Deep high-temperature geothermal resource Geological modeling Resource assessment Lower Paleozoic Jiyang Depression

ELECTROCHEMICAL SYNTHESIS AND PROPERTIES OF POLY(AZURE B)

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 Journal of Polymer Science 2001年第4期19卷 359-370页

作者： Dan Shan Shao-lin Mu Department of Chemistry school of sciences, yangzhou university yangzhou 225002, china 扬州大学江苏扬州

A blue poly(azure B) film has been synthesized using repeated potential cycling between -0.25 and 1.10 V (versus SCE). The electrolytic solution consisted of 2.5 mmol dm(-3) azure B, 0.5 mol dm(-3) NaCl and 0.2 mol dm(-3) NaH2PO4 at the pH range of 2.0 to 11.0. The in situ visible spectrum during electrolysis of azure B shows that the intensity at 740 nm peak increases with increasing numbers of potential cycles, which is attributable to the formation of poly(azure B). The wavelength of its corresponding absorption peak is 98 nm longer than that of azure B. The polymerization rate is strongly affected by pH values. The anodic peak potential and cathodic peak potential of the poly(azure B) in a solution of pH 3.0 are not affected by increasing the scan rate from 25 to 600 mV s(-1). Poly(azure B) has good electrochemical reversibility and fast charge transfer characteristic in the pH range of 2.0 and 11.0. The conductivity of poly(azure B) is 1.5 x 10(-4) S cm(-1) According to the differences between FTIR spectra of poly(azure B) and azure B, an electrochemical polymerization mechanism of azure B is proposed in this paper.

关键词： azure B electrochemical polymerization electrochemical properties conductivity in situ UV-visible spectra FTIR spectra

THE ELECTROCHEMICAL PREPARATION OF POLYPHENOL WITH CONDUCTIBILITY

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2002年第4期20卷 309-316页

作者： Chuan-xiang Chen Shao-lin Mu Department of Chemistry school of sciences yangzhou university yangzhou 225002 china Department of Chmeistry School of Sciences Yangzhou University Yangzhou 225002

Polyphenol film deposited on platinum foil can continuously grow with time during the electrolysis of a phenol solution consisting of 0.1 mol L-1 phenol, 3 mol L-1 NaOH and 0.5 mol L-1 Na2SO4, as has been proved by the methods of sweep potential, constant potential and constant current, and visible spectra during the electrolysis of phenol. A polyphenol film with thickness of 0.11 mm was obtained by the electrolysis of phenol at a constant potential of 0.70 V (versus Ag/AgCl with saturated KCl solution). Polyphenol film is inactive and stable in 2 mol L-1 H2SO4 solution, neutral solution and 3 mol L-1 NaOH solution and in the potential range between -0.95 and 1.35 V. The usable potential range is dependent on the pH value. Polyphenol has an ESR signal with a g factor of 2.0049. The conductivity of polyphenol is 1.2 x 10(-4) S cm(-1). In the solution of polyphenol dissolved in DMSO, the mobility of polyphenol anions is 8 x 10(-9) m(2) s(-1) V-1 at 20degreesC.

关键词： phenol concentrated alkaline solution electrochemical polymerization polyphenol electrochemical properties mobility spectra of FTIR and ESR

UNIFORM BLOWUP PROFILES FOR DIFFUSION EQUATIONS WITH NONLOCAL SOURCE AND NONLOCAL BOUNDARY1

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2004年第3期24卷 443-450页

作者： LinZhigui LiuYurong schoolofmathematicalScience YangzhouUniversityYangzhou225002China

Long time behavior of solutions to semilinear parabolic equations with nonlo-cal nonlinear source ut-Δu=∫Ωg(u)dx in Ω×(0, T) and with nonlocal boundary con-dition u(x, t)=∫Ωf(x, y)u(y,t)dy on эΩ×(0, T) is studied. The authors establish local existence, global existence and nonexistence of solutions and discuss the blowup properties of solutions. Moveover, they derive the uniform blowup estimates for g(s)= s^p(p＞1) and g(s)=e^э under the assumption ∫Ωf(x,y)dy＜1 for x∈эΩ.

关键词： Blowup nonlocal source nonlocal boundary condition 35K50 35B40

SYNTHESIS OF POLYCATECHOL WITH ELECTROCHEMICAL ACTIVITY AND ITS PROPERTIES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2002年第6期20卷 517-524页

作者： Yong Kong Shao-lin Mu Bing-wei Mao Department of Chemistry school of sciences, yangzhou university yangzhou 225002, china State Key Laboratory of Physical Chemistry of the Solid Surface, Xiamen university,Xiamen 361005, china Department of Chemistry School of Sciences Yangzhou University Yangzhou 225002 Xiamen university State Key Laboratory of Physical Chemistry of the Solid Surface Xiamen 361005

The electrochemical polymerization of catechol on platinum has been carried out using repeated potential cycling between -0.2 and 1.1 V (versus SCE). The electrolytic solution consisted of 0.2 mol dm(-3) catechol, 0.5 mol dm(-3) NaCl and 0.1 mol dm(-3) Na2HPO4 with pH 8.72. Catechol can not be polymerized at pH greater than or equal to 10.12. Polycatechol has an electrochemical lactivity at pH less than or equal to 4. The anodic and cathodic peak potentials of polycatechol shift towards more negative values as the pH of the solution increases from 1 to 4. The electrochemical activity of polycatechol hardly changes in this pH region, but it decreases slowly with time. This is caused by oxygen in air, which leads to an irreversible oxidation of polycatechol. This property is favorable for protecting metals from corrosion. Raman and FTIR spectra of polycatechol and catechol are quite different. AFM images of polycatechol films provide evidence that the image of the oxidized state of polycatechol is markedly different from that of the reduced one. This difference is caused by doping and dedoping of polycatechol.

关键词： catechol polycatechol electrochemical activity Raman spectra FTIR spectra AFM images

LIFE SPAN OF A SMOOTH SOLUTION FOR THE SURFACE DIFFUSION FLOW

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2003年第3期24卷 331-342页

作者： LIU ZUHAN Department of Mathematics, yangzhou university, yangzhou 225002, Jiangsu, china. Department of Mathematics Yangzhou University Yangzhou 225002 Jiangsu China

Consider the motion of immersed hypersurfaces driven by surface diffusion flow and give anlower bound on the life span of a smooth immersed solution, which depends only on how muchthe curvature of the initial surface ... 详细信息

关键词： Surface diffusion flow Mean curvature Second fundamental form Fourth order equation

Local formations in which every subformation of type N_(P) has a complement

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第5期42卷 364-368页

作者： GUO WenbinDepartment of Mathematics, yangzhou university, yangzhou 225002, china Department of Mathematics Yangzhou University Yangzhou China

ALL the groups considered in this note are finite. Definitions and notations are the same

关键词： group formation local formation algebra of formations.

Reaction of [(μ -RE)(μ -CO)Fe_2(CO)_6]-[Et_3NH]^+ (E=S, Se, Te)Salts with Benzenesulfinyl Chloride and Carbon Disulfide

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1999年第11期10卷 973-974页

作者： Chao Guo YAN(Department of Chemistry, yangzhou university, yangzhou 225002) Department of Chemistry Yangzhou University Yangzhou 225002 China

The salts of [(μ -RE)(μ-CO)Fe2(CO)6] -[Et3NH]+(E = S. Se, Te) react withbenzenesulfinyl chloride to give the μ -sulfinyl group bridged complexes (μ-RE)(μ- PhS=O)Fe2(CO6), in good yields. Whereas the salts [(μ -RS)(μ -CO)Fe2(CO)6]-[Et_3NH]+(R =t- Bu, Ph) react with carbon disulfide to yield the dithioformato-bridged anionic salts [(μ -RS)(μ- S=C-S)Fe2(CO)6]-[Et3NH], which react in situ at the exo-sulfur atom of the dithioformato-groupwith diverse α.β-unsaturated carbonyl compounds to give Michael addition products inmoderate yields.

关键词： Cluster carbonyl iron sulfur selenium synthesis.