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Improving model performance in mapping cropland soil organic matter using time-series remote sensing data

Journal of Integrative Agriculture 2024年第8期23卷 2820-2841页

作者： Xianglin zhang {1. Xue Songchao Chen Zhiqing Zhuo Zheng Wang Xueyao Chen Yi {2. Zhou Shi institute of Applied Remote Sensing and Information Technology College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Department of Land Management Zhejiang UniversityHangzhou 310058China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China institute of Digital Agriculture Zhejiang Academy of Agricultural SciencesHangzhou 310021China Key Laboratory of Spectroscopy Sensing Ministry of Agriculture and Rural AffairsHangzhou 310058China

Faced with increasing global soil degradation,spatially explicit data on cropland soil organic matter(SOM)provides crucial data for soil carbon pool accounting,cropland quality assessment and the formulation of effective management *** a spatial information prediction technique,digital soil mapping(DSM)has been widely used to spatially map soil information at different ***,the accuracy of digital SOM maps for cropland is typically lower than for other land cover types due to the inherent difficulty in precisely quantifying human *** overcome this limitation,this study systematically assessed a framework of“information extractionfeature selection-model averaging”for improving model performance in mapping cropland SOM using 462.cropland soil samples collected in Guangzhou,China in *** results showed that using the framework of dynamic information extraction,feature selection and model averaging could efficiently improve the accuracy of the final predictions(R^(2.:0.48 to 0.53.without having obviously negative impacts on *** the dynamic information of the environment was an efficient way to generate covariates that are linearly and nonlinearly related to SOM,which improved the R^(2.of random forest from 0.44 to 0.48 and the R^(2.of extreme gradient boosting from 0.3.to *** recursive feature selection(FRFS)is recommended when there are relatively few environmental covariates(2.0),whereas Boruta is recommended when there are many environmental covariates(>500).The Granger-Ramanathan model averaging approach could improve the prediction accuracy and average *** the structures of initial prediction models are similar,increasing in the number of averaging models did not have significantly positive effects on the final *** the advantages of these selected strategies over information extraction,feature selection and model averaging have a great potential for high-accuracy soil mapping

关键词： cropland soil organic matter digital soil mapping machine learning feature selection model averaging

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Eco-friendly calcium alginate microspheres enable enhanced profile control and oil displacement

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Petroleum Science 2024年第3期21卷 1928-1943页

作者： xiao-Han {1. Chang-{2.g Zhou Yuan-Xiang xiao Bo Hui Yong-Gang Xie Yu-Bin Su Xin-Ru Li jie Huang Mao-Chang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an710049ShaanxiPR.China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs School of Petroleum EngineeringXi'an Shiyou UniversityXi'an 710065ShaanxiPR.China Oil&Gas Technology Research institute Changqing Oilfield Branch CompanyPetroChinaXi'an710021ShaanxiPR China Suzhou academy of Xi'an Jiaotong University Suzhou215123JiangsuPR China

Polymer microspheres(PMs),such as polyacrylamide,have been widely applied for enhanced oil recovery(EOR),yet with environmental ***,we report a microfluid displacement technology containing a bio-based eco-friendly material,i.e.,calcium alginate(CaAlg)microspheres for *** dominant mechanisms responsible for EOR over Ca Alg fluid have been verified,including the microscopic oil displacement efficacy augmented by regulating capillary force(determined by the joint action of interfacial tension and wettability between different phases)and macroscopic sweep volume increment through profile control and mobility ratio *** comprehensive effectiveness can be further impacted when the CaAlg microsphere is embellished ulteriorly by using appropriate amount of sodium dodecyl sulfonate(SDS).The core flooding and nuclear magnetic resonance(NMR)tests demonstrate that CaAlg-SDS microsphere can balance the interphase property regulation(wettability alteration and IFT reduction)and rheology properties,enabling simultaneous profile control and oil *** introduction of SDS will have a negative impact on rheological properties,which is not favored for *** results show that the involvement of 4-m M SDS will provide the best behavior,with an EOR rate of 3..3.%.This cost-effective and environmentally-friendly bio-microspherebased microfluidic displacement technology is expected to achieve“green”oil recovery in future oilfield exploitation.

关键词： Calcium alginate microspheres Wettability Interfacial tension Rheology Viscoelasticity Enhanced oil recovery(EOR)

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Synthesis and structural characterization of Zn_3._{1.powder

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Science China(Physics,Mechanics & Astronomy) 2005年第2期48卷 201-210页

作者： ZONG Fujian1. MA Honglei1. XUE Chengshan2. ZHUANG Huizhao2. zhang Xijian1. MA {3.1. JI Feng1.& {2. Hongdi1.1. School of Physics and Microelectronics, Shandong University, {3.an 2.01.0, China 2. institute of Semiconductor, Shandong Normal University, {3.an 2.001., China School of Physics and Microelectronics Shandong University Jinan 250100 China institute of Semiconductor Shandong Normal University Jinan 250014 China

Zinc nitride (Zn3.{1. powder has been synthesized through the nitridation reaction of Zn powder with NH3.gas (at the flow rate of 500 ml/min) at the nitridation temperature of 600℃ for 1.1. min. X-ray diffraction (XRD) indicates that Zn3.{1.is cubic in structure with the lattice constant being a = 0.9788 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that Zn3.{1.powder has surface morphology of various types. X-ray photoelectron spectroscopy (XPS) shows the differences in chemical bonding states between Zn3.{1.and ZnO, and confirms the formation of N–Zn bonds. Observation through high resolution transmission electron microscopy (HRTEM) also indicates that the computer simulation of the structure of Zn3.{1.is consistent with the structural model put forward by Partin.

关键词： nitridation, Zn3.2 powder, structure, XRD, SEM, TEM, HRTEM, XPS.

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Construction and performance test of charged particle detector array for MATE

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Nuclear Science and Techniques 2024年第8期35卷 92-100页

作者： xiao‑Bin Li Long‑Hui Ru Zhi‑Chao {1. Bing‑Feng Lv Ning‑Tao {1. {3.‑Long {1. Chen‑Gui Lu Bing‑Shui Gao Jun‑Bing Ma Fu‑Shuai Shi Satoru Terashima xiao‑Dong Xu Zhen Bai Shi‑Wei Xu Yan‑Yun Yang Hooi‑{3. Ong xiao‑Dong Tang institute of Modern Physics(IMP) Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Research Center for Nuclear Physics Osaka UniversityIbarakiOsaka 567‑0047Japan RIKEN Nishina Center WakoSaitama 351‑0198Japan Joint Department for Nuclear Physics Lanzhou University and Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China

A charged particle array named MATE-PA,which serves as an auxiliary detector system for a Multi-purpose Active-target Time projection chamber used in nuclear astrophysical and exotic beam Experiments(MATE),was *** array comprised of 2. single-sided strip-silicon detectors covering approximately 1.%of the solid *** detectors facilitated the detection of reaction-induced charged particles that penetrate the active volume of the *** performance of MATE-PA has been experimentally studied using an alpha source and a {1.-MeV 1. N beam injected into the MATE chamber on the radioactive ion beam line in Lanzhou(RIBLL).The chamber was filled with a gas mixture of 95%4 He and 5%CO_(2. at a pressure of 500 *** results indicated good separation of light-charged particles using the forward double-layer silicon detectors of *** energy resolution of the Si detectors was deduced to be approximately 1.(σ)for an energy loss of approximately 1. MeV caused by theα*** inclusion of MATE-PA improves particle identification and increases the dynamic range of the kinetic energy of charged particles,particularly that of theαparticles,up to approximately 1. MeV.

关键词： Silicon detector array Active target Time projection chamber

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The lactylation index predicts the immune microenvironment and prognosis of pan-cancer patients

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BIOCELL 2024年第8期48卷 1223-1239页

作者： XUEJIA ZHAI jie LIU {1.WEI {2. TAO {3. JUN WANG JIANJUN LI SHICANG YU Department of Oncology Southwest HospitalThird Military Medical University(Army Medical University)Chongqing400038China Department of Stem Cell and Regenerative Medicine Institute of Pathology and Southwest Cancer CenterSouthwest HospitalThird Military Medical University(Army Medical University)Chongqing400038China Key Laboratory of Cancer Immunopathology Ministry of EducationChongqing400038China International Joint Research Center for Precision Biotherapy Ministry of Science and TechnologyChongqing400038China jin-feng Laboratory Chongqing401329China

Background:Protein lactylation is a new way for the“metabolic waste”lactic acid to perform novel ***,our understanding of the contribution of protein lactylation to both tumor progression and therapeutic interventions remains *** construction of a scoring system for lactylation to predict the prognosis of pancancer patients and to evaluate the tumor immune microenvironment(TIME)would improve our understanding of the clinical significance of ***:Consensus clustering analysis of lactylation-related genes was used to cluster 1.7 pancreatic adenocarcinoma(PAAD)***,a scoring system was developed using the least absolute shrinkage and selection operator(LASSO)*** validation and external validation were both conducted to assess and confirm the predictive accuracy of the scoring ***,leucine rich repeat containing 1.LRRC1.,a newly discovered lactylation-related gene,was analyzed in PAAD in ***:Utilizing the profiles of 3.{1.lactylation-related genes,a total of 1.7 patients with PAAD were segregated into two distinct ***^(high) patients had a poorer prognosis than LacCluster^(low) *** the differential analysis between the LacCluster^(high) and LacCluster^(low) groups,we identified additional genes associated with *** genes were then integrated to construct the LacCluster-enhanced system,which enabled more accurate prognosis prediction for patients with ***,a lactylation index containing three genes(LacI-3.was constructed using LASSO *** was done to enhance the usability of the LacCluster-enhanced system in the *** to those in the LacI-3.(high) subgroup,patients in the LacI-3.(low) subgroup exhibited increased expression of immune checkpoint-related genes,more immune cell infiltration,lower tumor mutation burdens,and better prognoses,indicating a“hot tumor”***,knocking down the expression of LRRC1.

关键词： Pancreatic adenocarcinoma Pan-cancer Lactylation Prognosis Tumor immune microenvironment LRRC1

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Gene cloning,protein expression,and enzymatic characterization of a double-stranded RNA degrading enzyme in Apolygus lucorum

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Insect Science 2024年第1期31卷 119-133页

作者： jie-Yu {1. {2.g Zhao Keyan Zhu-Salzman Qin-Qin Ji Yi-Ping Jiang Liu-Bin {3. De-{2. Xu Guang-Chun Xu Lin-Quan Ge Yong-An Tan College of Plant Protection Yangzhou UniversityYangzhouJiangsu ProvinceChina institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingJiangsu ProvinceChina Department of Entomology Texas A&M UniversityCollege StationTXUSA Taizhou Customs of the People's Republic of China TaizhouJiangsu ProvinceChina

RNA interference(RNAi)is a powerful tool that post-transcriptionally silences target genes in eukaryotic ***,silencing efficacy varies greatly among different insect ***,we met with little success when attempting to knock down genes in the mirid bug Apolygus lucorum via dsRNA *** disappearance of double-stranded RNA(dsRNA)could be a potential factor that restricts RNAi ***,we found that dsRNA can be degraded in midgut fluids,and a dsRNase of ***(AldsRNase)was identified and *** alignment indicated that its 6 key amino acid residues and the Mg2.-binding site were similar to those of other insects’*** signal peptide and endonuclease non-specific domain shared high sequence identity with the brown-winged green stinkbug Plautia stali *** showed high salivary gland and midgut expression and was continuously expressed through the whole life cycle,with peaks at the 4th instar ecdysis in the whole *** purified AldsRNase protein obtained by heterologously expressed can rapidly degrade *** comparing the substrate specificity of AldsRNase,{1.specific substrates(dsRNA,small interfering RNA,and dsDNA)were all degraded,and the most efficient degradation is ***,immunofluorescence revealed that AldsRNase was expressed in the cytoplasm of midgut *** cloning and functional study of AldsRNase,the enzyme activity and substrate specificity of the recombinant protein,as well as the subcellular localization of nuclease,the reason for the disappearance of dsRNA was explained,which was useful in improving RNAi efficiency in *** and related species.

关键词： Apolygus lucorum cloning dsRNase enzymatic activity protein expression

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Geochemical characteristics and applications of 1.α(H)-neohopanes and 1.α(H)-diahopanes

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chinese Science Bulletin 2000年第19期45卷 1742-1748页

作者： WANG Chunjiang, FU Jiamo, SHENG Guoying, xiao Qianhua, LI {1.you, {2. Yali & PIAO Mingzhi1. Slate Key Laboratory of Organic Geochemistry, Guangzhou {3. of Geochemistry, {3. academy of Sciences. Guang/hou 51.640, China 2. Department of Geosciences, Petroleum University, Bei{1.g 1.2.00, China 3. {3. of Petroleum Exploration and Exploitation, Liaohe Bureau of Petroleum Exploration, Pan{1. 2.0000, China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Department of Geosciences Petroleum University Beijing China institute of Petroleum Exploration and Exploitation Liaohe Bureau of Petroleum Exploration Panjin China

Distributions and geochemical significances of 1.α(H)-neohopanes and of 1.α(H)-diahopanes in oils from west Xialiaohe depression of the Bohai Bay Basin have been studied. Relative abundance of 1.α(H)-neohopanes and of 1.α(H)-diahopanes can be effectively used as maturity parameters, in a range of medium-high mature stage, based on consideration on sedimentary-organic facies of source rocks. With a dual geochemical significance of maturity and sedimentary-organic facies, neohopane and diahopane parameters can be well used in oil-source correlation and in petroleum population division. Formation, primary concentration and preservation of precursors of rearranged hopanes are closely related to depositional conditions such as Eh-pH and clays content. A series of probable diahopanes (series D) was detected in the oils, which exhibits a similar distribution pattern and geochemical behavior as that of 1.α(H)-diahopanes (series B).

关键词： 1.α(H)-neohopane 1.α(H)-diahopane maturity sedimentary-organic facies.

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Application of backflush and micro-flow techniques to the analysis of C5—C1.0}hydrocarbons in crude oils and its geochemical significance

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Progress in Natural Science:Materials International 2007年第11期17卷 1382-1387页

作者： Wang Peirong1,2. Zhao Hong2.3. Xu Guanjun1,4, Zhu Cuishan2.3. {3. Tingrong4, zhang Min2.3.and zhang Bin1,4(1. Key Laboratory of Petroleum Geochemistry, China National Petroleum Corporation, Beijing 100083. China 2. Geochemistry Department of Yangtze University, jingzhou 43.02., China 3. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, jingzhou 43.02., China 4. Petroleum Geology Central Laboratory, Research {13. of Petroleum Exploration and Development, PetroChina, Beijing 100083. China) Key Laboratory of Petroleum Geochemistry China National Petroleum Corporation Beijing 100083 China Geochemistry Department of Yangtze University Jingzhou 434023 China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Yangtze University Jingzhou 434023 China Petroleum Geology Central Laboratory Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

An Agilent 6890N GC equipped with both FID and Agilent 5975 MSD analyzer has been employed to analyze C5—C1.0}hydrocarbon fractions of crude oils. A technical combination of program temperature volatilizer injection, backflush and micro-flow controller afforded a fine separation of C5—C1.0}compounds on a PONA column with the heavy part of crude oils being cut off before entering the analytical column. Both GC-FID chromatogram and GC-MS mass chromatograms (MID and full scan) could be obtained at the same time. The retension time differences of nC6—nC1.0}alkanes between GC and TIC were in the range of 0.02.0.58 minutes. Totally 2.6 peaks have been assigned group compositions. Results on 8 typical oil samples from CNPC Key Laboratory Crude Oil Library showed that the characteristics of C6—C1.0}hydrocarbon group composition could be used in oil-oil correlation studies.

关键词： GC analysis GC/MS analysis backflush micro-flow controller light fraction in crude oil

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AKT2.(S1.0})/CCTα^(S3.5/3.9/3.0})-positive cancer-associated fibroblasts (CAFs) mediate focal adhesion kinase (FAK) inhibitors resistance via secreting phosphatidylcholines (PCs)

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Signal Transduction and Targeted Therapy 2024年第2期9卷 782-796页

作者： jie Chen Lingyuan {1. Yuheng Zhu Di Zhao {2.g {1. Yanmeng Zhu {2.gyuan Pang Yuanfan xiao Qingnan Wu Yan Wang Qimin Zhan Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Laboratory of Molecular OncologyPeking University Cancer Hospital&Institute100142 BeijingChina Peking University International Cancer institute Peking University100191 BeijingChina Research Unit of Molecular Cancer Research Chinese Academy of Medical SciencesBeijingChina Soochow University Cancer institute Suzhou 215000China institute of Cancer Research Shenzhen Bay LaboratoryShenzhen 518107China

Abnormal metabolism is regarded as an oncogenic hallmark related to tumor progression and therapeutic *** study employed multi-omics,including phosphoproteomics,untargeted metabolomics and lipidomics,to demonstrate that the pAKT2.Ser1.0} and pCCTαSer3.5/3.9/3.0}-positive cancer-associated fibroblasts(CAFs)substantially release phosphatidylcholines(PCs),contributing to the resistance of focal adhesion kinase(FAK)inhibitors in esophageal squamous cell carcinoma(ESCC)***,we observed extremely low levels of FAK Tyr3.7 expression in CAFs,potentially offering no available target for FAK inhibitors playing their anti-growth role in ***,FAK inhibitor increased the intracellular concentration of Ca2.in CAFs,promoting the formation of AKT2.CCTαcomplex,leading to phosphorylation of CCTαSer3.5/3.9/3.0} sites and eventually enhancing stromal PC *** activation could stimulate the intratumoral Janus kinase 2.JAK2./Signal transducer and activator of transcription 3.STAT3.pathway,triggering resistance to FAK *** of clinical samples demonstrated that stromal pAKT2.Ser1.0} and pCCTαSer3.5/3.9/3.0} are related to the tumor malignancy and reduced patient ***-targeted lipidomics and further validation cohort quantitatively showed that plasma PCs enable to distinguish the malignant extent of ESCC *** conclusion,inhibition of stroma-derived PCs and related pathway could be possible therapeutic strategies for tumor therapy.

关键词： CAFs metabolism resistance

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Microstructure and magnetocaloric properties of melt-extracted SmGdDyCoAl high-entropy amorphous microwires

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Rare Metals 2024年第3期43卷 1234-1242页

作者： Shi-jie Wei Hong-Xian Shen Lun-Yong {1. Lin Luo Xin-Xing Tang Jian-Fei Sun {2.-Qing Li School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Applied Materials Physics Department of Materials Science and EngineeringKTH-Royal Institute of Technology10044StockholmSweden

This paper presents a systematic investigation of the microstructure and magnetocaloric properties of melt-extracted Sm_(2.)Gd_(2.)Dy_(2.)Co_(2.)Al_(2.)high-entropy *** fabricated wires exhibited an amorphous structure,and the temperature interval of the undercooled liquid AT was 45 *** microwires underwent a second-order magnetic transition from a ferromagnetic to a paramagnetic state near the Curie temperature(T_(C)=52.K),The maximum magnetic entropy change(-ΔS_M^(max)),the relative cooling power and the refrigeration capacity reached 6.3. J·kg^(-1.·K^(-1..42..09 J·kg^(-1.and 3.2.94 J·kg^(-1.,respectively,under a magnetic field change of 5 *** addition,the temperature-averaged entropy changes with two temperature lifts(3.and 1. K)were 6.3.0}and 6.2. J·kg^(-1.·K^(-1.,*** good magnetocalorie performance highlights the significant potential for the Sm_(2.)Gd_(2.)Dy_(2.)Co_(2.)Al_(2.)microwires to be used as magnetic refrigerant materials in low-temperature region *** work will serve as a valuable reference for future investigations on low-temperature high-entropy magnetocaloric materials.

关键词： Melt-extraction High-entropy amorphous microwires Magnetocaloric effect Magnetic refrigeration

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