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Significance of Tr.nsients in Soil Temperature Series

Pedosphere 2007年第6期17卷 766-775页

作者： X. zhou n. PErSAUD D. P. BELESKY r. B. CLArK Department of Crop ＆ Soil Sciences The Pennsylvania State University State College Pennsylvania 16802 （USA） Department of Crop ＆ Soil Envir.nmental Sciences Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 （USA） USDA//ArS//AFSrC 1224 Airport Road Beaver West Virginia 25813 （USA）

The primary objective of this study was to investigate the impact of observation scale on the estimation of soil thermal *** are usually filtered out and ignored when classical Fourier approaches are used to deconstruct and model temperature time *** was hypothesized that examination of such tr.nsients may be more important in identifying and quantifying short-term perturbations in internal soil heat tr.nsfer induced by agr.nomic disturbances. Data-logged temperatures were collected at 10-minute intervals from thermistor probes installed at 10 and 25 cm depths in isolated areas of two grassed *** plot(6T)had been treated twice with 6 Mg ha^(-1)composted turkey litter as *** other plot(nPK)was fertilized at the same time with nPK *** methods were used to analyze the series to obtain appar.nt soil thermal diffusivity(D-value)at various time *** supported the hypothesis that short-term differ.nces in internal soil heat tr.nsfer between the 6T and nPK plots were more manifest and effectively captured by estimated D-values calculated from the monthly and daily partial *** 6T plot had higher soil organic matter content than the nPK plot and had lower appar.nt soil thermal *** soil temperature amplitudes, required to calculate the mean D-values from partial series,were more effectively obtained using a temperature change rate *** more commonly used Fourier analysis tended to be effective for this purpose when the partial series reasonably presented well-defined diurnal patterns of increasing and decreasing temperatures.

关键词： Fourier analysis organic matter soil temperature series thermal diffusivity

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STUDY OF MIXED rArE EArTH METAL (rEM) COnVErSIOnCOATInG On ALUMInUM ALLOY LY12

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Acta Metallurgica Sinica(English Letters) 2000年第5期13卷 1034-1038页

作者： Yu, X.W. Cao, C.n. zhou, D.r. Yin, Z.D. Lab. for Corrosion and Protection Inst. of Corrosion and Protection Chinese Acad. of Sci. shenyang 110015 China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

The process of mixed rare earth metal (rEM) conversion coating on aluminum alloy LY12 (2024) was introduced. The corrosion resistance of mixed rEM conversion coating was examined by using weight loss test and electrochemical method. The results show that the mixed rEM conversion coating increases the corrosion resistance of the alloy surface. Examination result of scanning electr.n microscope (SEM) shows that the coating exhibits honeycomb-like feature. X-ray diffraction (XrD) analysis reveals that the coating is amorphous. The result of X-ray photoelectr.n spectroscopy (XPS) indicates that mixed rEM conversion coating consists predominantly of Ce and O. The contents of other rare earth elements (La, Pr) are relatively low.

关键词： Aluminum alloys Composition Corrosion resistance Inorganic coatings Morphology

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Comparison of differ.nt approaches for direct coupling of solid-phase microextraction to mass spectrometry for drugs of abuse analysis in plasma

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Journal of Pharmaceutical Analysis 2023年第2期13卷 216-222页

作者： Wei zhou Martyna n.Wieczorek r.nshan Will Jiang Janusz Pawliszyn Department of Chemistry University of WaterlooWaterlooONN2L 3G1Canada Faculty of Food Science and nutrition Poznan University of Life SciencesPoznanPoland

The direct coupling of solid-phase microextraction(SPME)to mass spectrometry(MS)(SPME-MS)has proven to be an effective method for the fast screening and quantitative analysis of compounds in complex matrices such as blood and *** recent years,our lab has developed three novel SPME-MS techniques:SPME-microfluidic open interface-MS(SPME-MOI-MS),coated blade spray-MS(CBS-MS),and SPME-probe electrospray ionization-MS(SPME-PESI-MS).The fast and high-throughput nature of these SPME-MS technologies makes them attractive options for point-of-care analysis and anti-doping ***,all these three techniques utilize differ.nt SPME geometries and were tested with differ.nt MS *** of comparative data makes it difficult to determine which of these methodologies is the best option for any given *** work fills this gap by making a comprehensive comparison of these three technologies with differ.nt SPME devices including SPME fibers,CBS blades,and SPME-PESI probes and SPME-liquid chromatography-MS(SPME-LC-MS)for the analysis of drugs of abuse using the same MS ***,for the first time,we developed differ.nt desorption chambers for MOI-MS for coupling with SPME fibers,CBS blades,and SPME-PESI probes,thus illustrating the universality of this *** total,eight analytical methods were developed,with the experimental data showing that all the SPME-based methods provided good analytical performance with r^(2)of linearities larger than 0.9925,accuracies between 81%and 118%,and good precision with an rSD%≤13%.

关键词： Solid-phase microextraction Mass spectrometry Microfluidic open interface Coated blade spray Probe electrospray ionization Drug of abuse

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A dual-site Fe-based catalyst for efficient ammonia synthesis under mild conditions

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Science China Chemistry 2025年

作者： Shiyong Zhang Mingyuan Zhang Tianhua Zhang Jizhen Sun Jiaxin Li Kailin Su ruishao Mao Yanliang zhou Xuanbei Peng Yangyu Zhang Jun ni Bingyu Lin Xiuyun Wang Lilong Jiang national Engineer.ng research Center of Chemical Fertilizer Catalyst Fuzhou University Qingyuan Innovation Laboratory

Achieving green ammonia （nH3） synthesis requires developing effective catalysts under mild ***,the competitive adsorption of n2and H2,as well as the str.ng binding of n-containing intermediates on the catalyst,greatly inhibits the active sites for efficient ***,we constructed a series of ZrH2-modified Fe catalysts with dual active sites to address these issues and realized efficient nH3synthesis under mild *** study shows that ZrH2can not only provide active sites for H2activation but also tr.nsfer electr.ns to Fe sites for accelerating *** interaction between Fe and ZrH2over 40ZrH2-Fe leads to a decrease in work function and a downward shift of the d-band center,which is conducive to n2activation and nH3desorption,*** utilization of distinct sites for activating differ.nt reactants can avoid the competitive adsorption of n2and H2,leading to excellent nH3synthesis activity of the 40 wt.%ZrH2-mediated Fe *** a result,40ZrH2-Fe exhibits a high nH3synthesis rate of 23.3 mmol g-1cath-1at 400°C and 1 MPa and robust stability dur.ng100 h time-on-stream.

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EFFECT OF Mo AnD Mo_2C On THE MICrOSTrUCTUrE AnD PrOPErTIES OF THE CErMETS BASED On Ti(C,n)

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Acta Metallurgica Sinica(English Letters) 2008年第3期21卷 211-219页

作者： S.Q. zhou W. Zhao W.H. Xiong Y.n. zhou School of Materials Science and Engineer.ng Huazhong University of Science and Technology Wuhan 430074 China The University of Waterloo Waterloo ON N2L3G1 Canada

Effect of Mo and Mo2 C on the microstructure and properties of Ti（C,n）-based cermets was investigated in this article. The results have indicated that the weight percentage of Mo from 5 to 10 can reduce Ti（C,n） grain diameter and thickness of the rim, and Ti（C,n） grain can be wetted by ni-Cu-Mo liquid so as to get small contiguity of Ti（C,n） grain. In that way, the tr.nsverse rupture str.ngth of Ti（C,n）-based cermets has reached 1800-1900 MPa; the fracture toughness has been due to 16-18 MPa.m1/2. But 15 wt pct Mo was not more effective on Ti（C,n）-based cermets, because the thickness of the rim becomes larger. In the circumstance of Mo2 C, 5 wt pct Mo2 C was good for microstructure and properties of Ti（C,n）-based cermets, but 11 wt pct Mo2C has resulted in larger contiguity of Ti（C,n） grain and big Ti（C,n） grain diameter so as to reduce tr.nsverse rupture str.ngth and fracture toughness. So that, the effect of Mo on Ti（C,n）-based cermets is better than Mo2C.

关键词： Cermet Tr.nsverse rupture str.ngth (TrS) Contiguity Fracture toughness

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Variation of morphological and leaf stoichiometric traits of two endemic species along the elevation gradient of Mount Kenya, East Africa

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Journal of Plant Ecology 2020年第6期13卷 785-792页

作者： Antony n.Waigwa Brian njoroge Mwangi Gituru r.Wahiti Fred Omengo Yadong zhou Qingfeng Wang Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China University of Chinese Academy of Sciences Beijing 100049China Sino-Africa Joint research Center(SAJOrEC) Jomo Kenyatta University of Agriculture and TechnologyJujaNairobi 00200Kenya Department of Biodiversity research Kenya Wildlife ServiceNairobi 00100Kenya Center of Conservation Biology Core Botanical GardensChinese Academy of SciencesWuhan 430074China Sino-Africa Joint research Center(SAJOrEC) Chinese Academy of SciencesWuhan 430074China

Aims The aim of this paper is to assess morphological and leaf stoichiometric responses of Dendrosenecio keniensis and Lobelia gregoriana to extreme envir.nmental conditions along an elevation gradient in tropical *** In this study,we assessed the variation of the morphological traits,including plant height,leaf area,leaf thickness,leaf dry weight,specific leaf area and the leaf stoichiometry traits nitrogen,carbon and phosphorous of the two endemic species *** and *** further explored the relations of these morphological traits to soil organic carbon,soil total nitrogen,soil phosphorous,annual mean temperature,annual mean precipitation,annual total solar radiation,water vapor pressure and the topographic variables aspect,slope and hill shade along the elevation *** 10 m×10 m sampling plots were set up along the elevation gradient r.nging from 3500 to 4300 *** used 1 km×1 km grid cells to rasterize our study area in ArcGIS 10.5 for easy access to data pertaining to the climate of each elevation *** performed linear regression of the morphological and leaf stoichiometric traits with elevation as explanatory *** conducted correlation analysis on the morphological and leaf stoichiometric traits with climatic,soil and topographic variables along the elevation *** Findings Dendrosenecio keniensis had wool-like pubescent leaves while *** had mucilage packed succulent and waxy cuticle leaves to avoid *** species exhibited reduced metabolic rates as shown by the low leaf phosphorous *** results also showed that changes in morphology and leaf stoichiometry were determined by a combination of climate,soil and topographic variables that change along elevation on Mount *** observed variations in the morphological and leaf stoichiometric traits of *** and ***,which grow side by side along the elevation gradient,were interpreted as adaptation to the harsh en

关键词： Africa elevation gradient functional traits adaptability climate change

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Hydrophobic long-chain two-dimensional perovskite scintillators for underwater X-ray imaging

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rare Metals 2024年第1期43卷 175-185页

作者： Jin-Xiao Zheng Zi-An zhou Tiao Feng Hui Li Cheng-Hua Sun nüWang Yang Tian Yong Zhao Shu-Yun zhou Key Laboratory of Photochemical Conversion and Optoelectr.nic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Bioinspired Smart Interfacial Science and Technology of the Ministry of Education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Department of Engineer.ng Physics Tsinghua University and Key Laboratory of Particle and Radiation Imaging Ministry of EducationTsinghua UniversityBeijing 100084China e-mail:yangt@***

The underwater X-ray imaging technology development is significant to subaqueous target reconnaissance/detection/identification, subfluvial archaeology,submerged resource exploration, etc. As the core of X-ray imaging detection, the scintillator has been plagued by inher.nt moisture absorption and decomposition, and strict requirements for seamless packaging and ***, we designed a manganese-doped two-dimensional(2D) perovskite scintillator modified by hydrophobic longchain organic amine through the combination of component and doping engineer.ng. The modified perovskites show high water repellency that can be used as an underwater X-ray scintillator. X-ray images of aquatic organisms or other objects with a high spatial resolution of10 lp·mm^(-1) at a big view field(32 mm × 32 mm) were obtained by scintillation screen. This hydrophobic perovskite scintillator based on molecular design is of great promise in underwater X-ray nondestructive testing technology development.

关键词： Two-dimensional perovskite Hydrophobic Scintillators Underwater X-ray imaging Underwater.nondestructive testing technology

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The Ti-TAn plasmid toolbox for TurboID-based proximity labeling assays in nicotiana benthamiana

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Journal of Integrative Plant Biology 2024年第2期66卷 166-168页

作者： Huang Tan Yu zhou Erik Dinius rosa Lozano-Dur.n Department of Plant Biochemistry Center for Plant MolecularBiology(ZMBP)Eberhard Karls UniversityTubingenD‐72076Germany

Protein-protein interactions and the formation of protein complexes play a central role in the regulation of virtually all aspects of *** identification and characterization of interactions between proteins is the bas... 详细信息

关键词： proximity complexes enable

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nAnOSIZE EFFECT In GrAIn BOUnDArY MIGrATIOn OF COPPEr

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 11-15页

作者： L.zhou X.Q.Wei n.G.zhou D.G.Li School of Materials Science and Engineer.ng Nanchang UniversityNanchang 330047ChinaSchool of Materials Science and EngineeringNanchang UniversityNanchang 330047ChinaSchool of Materials Science and EngineeringNanchang UniversityNanchang 330047ChinaCentral Iron and Steel Research InstituteBeijing 100083China

Molecular dynamics simulations of high temperature annealing of copper bicrystals have been carried out. The bicrystals have planar grain boundaries, and the gain size varies in nano r.nge. An EAM (embedded atom method) potential of FS type is used for calculating the interatomic forces. The results show that in nanocrystalline copper, GB migration driven by inter-GB reaction can take place. A critical grain size is identified, below which the inter-GB reaction becomes str.ng enough to trigger GB motion, which accelerates rapidly and leads to annihilation of the grain boundaries. The critical size is found to be 16 atomic radii. A "through intermediate grain mechanism" is identified for the nano-grain boundary motion observed, which is never reported for GB migrations of conventional polycrystalline metals.

关键词： grain boundary migration nanocrystal copper

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Stem cell differ.ntiation and human liver disease

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World Journal of Gastroenterology 2012年第17期18卷 2018-2025页

作者： Wen-Li zhou Claire n Medine Liang Zhu David C Hay Department of Gastroenterology Changzheng Hospital Second Military Medical University ofChina Shanghai 200003 China Medical re-search Council Centre for regenerative Medicine University ofEdinburgh Edinburgh EH 16 4UU Scotland United Kingdom

Human stem cells are scalable cell populations capable of cellular *** makes them a very attractive in vitro cellular resource and in theory provides unlimited amounts of primary *** an approach has the potential to improve our understanding of human biology and treating *** the future it may be possible to deploy novel stem cell-based approaches to treat human liver *** recent years,eff icient hepatic differ.ntiation from human stem cells has been achieved by several research groups including our *** this review we provide an overview of the f ield and discuss the future potential and limitations of stem cell technology.

关键词： Differ.ntiation Pluripotent stem cells Hepatocyte-like cells Liver development Polymer chemistry regenerative medicine Tr.nsplantation Bio-artif icial liver

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