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Organic Phosphorus in Shallow Lake Sediments in Middle and Lower Reaches of the Yangtze River Area in China

Pedosphere 2008年第3期18卷 394-400页

作者： JIN Xiang-Can WANG Sheng-Rui chu jian-zhou WU Feng-Chang State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake Eco-EnvironmentChinese Research Academy of Environmental Sciences Beijing 100012 （China） Colleges of Resource and Environment Hebei Agriculture University Baoding 071001 （China） State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang550002 （China）

Thirteen sediment core samples(0-10 cm) were taken from the seven lakes in the middle and lower reaches of the Yangtze River to determine the contents and distributions of organic phosphorus(P) fractions in the sediments of the shallow lakes in the *** organic P fractions in the sediments were in the order of moderately labile organic P(MLOP) > moderately resistant organic P(MROP) > highly resistant organic P(HROP) > labile organic P(LOP),with average proportional ratios of 13.2:2.8:1.3:***,MLOP,and MROP were significantly related to the contents of total organic carbon(TOC),water-soluble P(WSP),algal-available P(AAP),NaHCO3-extractable P(Olsen-P),total P(TP),organic P(OP),and inorganic P(IP).However,HROP was significantly related to OP and weakly correlated with TOC,WSP,AAP,Olsen-P,TP or *** suggested that organic P,especially LOP and MLOP in sediments,deserved even greater attention than IP in regards to lake *** terms of organic P,sediments were more hazardous than soils in lake *** OP concentrations were higher in moderately polluted sediment than those in heavily polluted sediment,LOP and MLOP were higher in the heavily polluted sediment,which indicated that heavily polluted sediment was more hazardous than moderately polluted sediment in lake eutrophication.

关键词： bioavailability chemical extracted phosphorus lake sediment middle and lower reaches of the Yangtze River area organic phosphorus fractions

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Advancing gravitational theory through the tetrahedral constellation gravitational wave observatory

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Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 197-198页

作者： Yun-Yong Wang zhou-jian Cao Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing102206China

The Tetrahedral Constellation Gravitational Wave Observatory(TEGO)[1]represents a significant leap forward in gravitational wave detection,advancing our understanding of gravitational *** introducing a fourth spacecraft to form a tetrahedral configuration,TEGO enhances traditional triangular setups,enabling the simultaneous sensitivity to all six gravitational wave polarization modes,including those not predicted by general relativity.

关键词： wave polarization theory

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STUDY ON OXID TIVE COUPLING OF METHANE Ⅱ.CATALY TIC PERFORMANCE AND CHARACTERIZATION OF TiO2-BASED CATALYSTS

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Journal of Energy Chemistry 1995年第2期 224-229页

作者： GONG Mao-chu zhou jian-Lue XU Zheng-Hong CHEN Yao-Qiang CHEN YuDepartment of Chemsbry cad Analytical & Testing Center Sichuan University Chengdu, Sichuan 610064

The catalytic performance of Mn/TiO,La-Mn/TiO,Li-La-Mn/TiOetc for the oxidetive coupling of methane（OCM）was *** were cheracterised with X-ray diffraction（XRD）and X-rayphotoelectron spectroscopy（XPS）.The results reveal that catalyst Li-La-Mn/TiOexhibits high activity and Cselectivity;Ti in this catalyst exists asTistate;Li can promote the formation of lanthanum tituate via theinteraction between La and TiO;the formed LaTiOand LaTiOaredistributed in the inner surface layer and Mn exists in outer surface layer in lowvalence *** high activity and Cselectivity of catalyst Li-La-Mn/TiOare intimately related to the valence states of Mn,Li,La and theirdistribution on the catulyst surface layer.

关键词： oxidative coupling methane TiO2-based catalysts XRD XPS

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A nuclide identification method ofγspectrum and model building based on the transformer

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Nuclear Science and Techniques 2025年第1期36卷 80-93页

作者： Fei Li chu-Yang Luo Ying-Zi Wen Sheng Lv Feng Cheng Guo-Qiang Zeng jian-Feng jiang Bing-Hai Li College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610000China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu 610000China Department of Physics Universitat Politècnica de CatalunyaBarcelona 08028Spain Airborne Survey and Remote Sensing Center of Nuclear Industry Shijiazhuang 050000China Hebei Key Laboratory of Airborne Detection and Remote Sensing Technology Shijiazhuang 050000China

In current neural network algorithms for nuclide identification in high-background,poor-resolution detectors,traditional network paradigms including back-propagation networks,convolutional neural networks,recurrent neural networks,etc.,have been limited in research on γ spectrum analysis because of their inherent mathematical *** is difficult to make progress in terms of training data requirements and prediction *** contrast to traditional network paradigms,network models based on the transformer structure have the characteristics of parallel computing,position encoding,and deep stacking,which have enabled good performance in natural language processing tasks in recent ***,in this paper,a transformer-based neural network (TBNN) model is proposed to achieve nuclide identification for the first ***,the Geant4 program was used to generate the basic single-nuclide energy spectrum through Monte Carlo simulations.A multi-nuclide energy spectrum database was established for neural network training using random matrices of γ-ray energy,activity,and *** on the encoder–decoder structure,a network topology based on the transformer was built,transforming the 1024-channel energy spectrum data into a 32×32 energy spectrum sequence as the model *** experiments and adjustments of model parameters,including the learning rate of the TBNN model,number of attention heads,and number of network stacking layers,the overall recognition rate reached 98.7%.Additionally,this database was used for training AI models such as back-propagation networks,convolutional neural networks,residual networks,and long shortterm memory neural networks,with overall recognition rates of 92.8%,95.3%,96.3%,and 96.6%,*** indicates that the TBNN model exhibited better nuclide identification among these AI models,providing an important reference and theoretical basis for the practical application of transformers in the qualitative and quantitativ

关键词： Nuclide identification Neural network Transformer

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Least Square Estimation for Multiple Functional Linear Model with Autoregressive Errors

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Acta Mathematicae Applicatae Sinica 2025年第1期41卷 84-98页

作者： Meng WANG Ming-liang SHU jian-jun zhou Si-xin WU Min CHEN School of Management University of Science and Technology of ChinaHefei 230026China Academy of Mathematics and System Science Chinese Academy of SciencesBeijing 100190China Yunnan Key Laboratory of Statistical Modeling and Data Analysis Yunnan UniversityKunming 650091China

As an extension of linear regression in functional data analysis, functional linear regression has been studied by many researchers and applied in various fields. However, in many cases, data is collected sequentially over time, for example the financial series, so it is necessary to consider the autocorrelated structure of errors in functional regression background. To this end, this paper considers a multiple functional linear model with autoregressive errors. Based on the functional principal component analysis, we apply the least square procedure to estimate the functional coefficients and autoregression coefficients. Under some regular conditions, we establish the asymptotic properties of the proposed estimators. A simulation study is conducted to investigate the finite sample performance of our estimators. A real example on China's weather data is applied to illustrate the validity of our model.

关键词： multiple functional linear model autoregressive errors principal component analysis consistency

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Nanoplastics and nano-ZnO facilitate Cd accumulation in zebrafish larvae via a distinct pathway: Revelation by LA-ICP-MS imaging

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Chinese Chemical Letters 2025年第2期36卷 436-440页

作者： Pengyu Chen Beibei Chen Man He Yuxi zhou Lei Lei jian Han Bingsheng zhou Ligang Hu Bin Hu Department of Chemistry Wuhan University State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

The interaction between nanoparticles （NPs） and pollutants affects their bioavailability and ***,the processes by which NPs and pollutants change in vivo have rarely been ***,using laser ablation-inductively coupled plasma-mass spectrometry （LA-ICP–MS）,we found that both nanoplastics and ZnO NPs caused more Cd to accumulate in zebrafish larvae,but with distinct *** could adsorb Cd2+and transfer it into the larvae through the“Trojan horse”*** coexposure of nanoplastics and Cd2+caused Cd to accumulate in the abdomen where the nanoplastics were located without dissociation,showing a lower toxic effect than Cd2+exposure *** NPs weakly adsorbed Cd2+,but they increased the Zn and Cd contents in larvae by enhancing the expression of metal *** coexposure of ZnO and Cd2+evenly distributed Cd in the larvae,revealing a more severe toxic effect than Cd2+exposure *** results demonstrated the changing bioavailability and toxicity of Cd induced by different *** also shows the vital role LA-ICP-MS plays in revealing the relationship between toxicity and *** addition,the long-term effect of bioavailability on heavy metal toxicity and nanosafety deserves further investigation.

关键词： Cadmium Combined effect LA-ICP-MS Nanoplastics Zebrafish larvae ZnO nanoparticles

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Treadmill exercise in combination with acousto-optic and olfactory stimulation improves cognitive function in APP/PS1 mice through the brain-derived neurotrophic factor-and Cygb-associated signaling pathways

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Neural Regeneration Research 2025年第9期20卷 2706-2726页

作者： Biao Xiao Chaoyang chu Zhicheng Lin Tianyuan Fang Yuyu zhou chuxia Zhang jianghui Shan Shiyu Chen Liping Li Department of Physiology and Pharmacology Health Science CenterNingbo UniversityNingboZhejiang ProvinceChina Ningbo Key Laboratory of Behavioral Neuroscience Health Science CenterNingbo UniversityNingboZhejiang ProvinceChina Key Laboratory of Addiction Research of Zhejiang Province NingboZhejiang ProvinceChina

A reduction in adult neurogenesis is associated with behavioral abnormalities in patients with Alzheimer's ***,enhancing adult neurogenesis represents a promising therapeutic approach for mitigating disease symptoms and ***,nonpharmacological interventions aimed at inducing adult neurogenesis are currently *** individual non-pharmacological interventions,such as aerobic exercise,acousto-optic stimulation,and olfactory stimulation,have shown limited capacity to improve neurogenesis and cognitive function in patients with Alzheimer's disease,the therapeutic effect of a strategy that combines these interventions has not been fully *** this study,we observed an age-dependent decrease in adult neurogenesis and a concurrent increase in amyloid-beta accumulation in the hippocampus of amyloid precursor protein/presenilin 1 mice aged 2-8 *** deposition became evident at 4 months,while neurogenesis declined by 6 months,further deteriorating as the disease ***,following a 4-week multifactor stimulation protocol,which encompassed treadmill running(46 min/d,10 m/min,6 days per week),40 Hz acousto-optic stimulation(1 hour/day,6 days/week),and olfactory stimulation(1 hour/day,6 days/week),we found a significant increase in the number of newborn cells(5'-bromo-2'-deoxyuridine-positive cells),immature neurons(doublecortin-positive cells),newborn immature neurons(5'-bromo-2'-deoxyuridine-positive/doublecortin-positive cells),and newborn astrocytes(5'-bromo-2'-deoxyuridine-positive/glial fibrillary acidic protein-positive cells).Additionally,the amyloid-beta load in the hippocampus *** findings suggest that multifactor stimulation can enhance adult hippocampal neurogenesis and mitigate amyloid-beta neuropathology in amyloid precursor protein/presenilin 1 ***,cognitive abilities were improved,and depressive symptoms were alleviated in amyloid precursor protein/presenilin 1 mice

关键词： acousto-optic stimulation adult neurogenesis Alzheimer's disease amyloid precursor protein/presenilin 1 mice amyloid-beta deposition brain cell apoptosis cognitive impairment depression-like behavior involuntary treadmill exercise olfactory stimulation serum metabolites

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Carbon Nanofiber/Polyaniline Composite Aerogel with Excellent Electromagnetic Interference Shielding,Low Thermal Conductivity,and Extremely Low Heat Release

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Nano-Micro Letters 2025年第4期17卷 77-95页

作者： Mingyi Chen jian Zhu Kai Zhang Hongkang zhou Yufei Gao Jie Fan Rouxi Chen Hsing-Lin Wang School of Textile Science and Engineering Tiangong UniversityTianjin 300387People’s Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China School of Innovation and Entrepreneurship Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Guangdong Provincial Key Laboratory of Energy Materials for Electric Power Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Ministry of Education Key Laboratory of Advanced Textile Composite Materials Tiangong UniversityTianjin 300387People’s Republic of China

The rapid development of communication technology and high-frequency electronic devices has created a need for more advanced electromagnetic interference(EMI)shielding *** response to this demand,a study has been conducted to develop multifunctional carbon nanofibers(CNFs)/polyaniline(PANI)aerogels with excellent electromagnetic interference shielding,flame retardancy,and thermal insulation *** process involved freeze-drying of electrospun CNFs and PANI nanoparticles followed by in situ growth PANI to coat the CNFs,creating the core-shell structured CNFs/PANI composite fiber and its hybrid aerogels(CP-3@PANI).The interaction between PANI and aniline(ANI)provides attachment sites,allowing additional ANI adsorption into the aerogel for in situ *** results in PANI uniformly covering the surface of the CNFs,creating a core-shell composite fiber with a flexible CNF core and PANI *** process enhances the utilization rate of the ANI monomer and increases the PANI content loaded onto the ***,effective connections are established between the CNFs,forming a stable,conductive three-dimensional network *** prepared CP-3@PANI aerogels exhibit excellent EMI shielding efficiency(SE)of 85.4 dB and specific EMI SE(SE d^(-1))of 791.2 dB cm^(3)g^(-1)in the *** to the synergistic flame-retardant effect of CNFs,PANI,and the dopant(phytic acid),the CP-3@PANI aerogels demonstrate outstanding flame-retardant and thermal insulation properties,with a peak heat release rate(PHRR)as low as 7.8 W g^(-1)and a total heat release of only 0.58 kJ g^(-1).This study provides an effective strategy for preparing multifunctional integrated EMI shielding materials.

关键词： CNFs/PANI hybrid aerogels EMI shielding Flame retardancy Thermal insulation

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Transition-metal-free isofunctional reaction of α,β-unsaturated ketones/nitriles

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Science China Chemistry 2025年第2期68卷 499-504页

作者： Runyou Ye Jialin Ming Qinyue Tao Tian-Yu Gao jian-Heng Ye Da-Gang Yu Xiangge zhou Key Laboratory of Green Chemistry&Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064China Inner Mongolia Key Laboratory of Fine Organic Synthesis Inner Mongolia UniversityHohhot 010021China

Isofunctional reactions involving the cleavage of carbon-carbon double bonds(C=C)hold an important position in organic synthesis,as they allow for the restructuring of alkene carbon chains and enable the exchange of functional groups without introducing exogenous ***,these reactions are primarily divided into C=C/C=C metathesis and C=C/C=O metathesis,with most relying on the use of transition metal *** report herein a C=C/CH_(2) metathesis reaction that obviates the need for transition metals and directing groups,and is characterized by economic and straightforward *** reaction not only facilitates the replacement of nitriles with ketones,but also enables the replacement of ketones with nitriles,demonstrating great universality.

关键词： isofunctional reaction transition-metal-free C=C cleavage base-promoted Michael addition

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Regulating local electron transfer environment of covalent triazine frameworks through F,N co-modification towards optimized oxygen reduction reaction

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Chinese Chemical Letters 2025年第1期36卷 344-348页

作者： Quanyou Guo Yue Yang Tingting Hu Hongqi chu Lijun Liao Xuepeng Wang Zhenzi Li Liping Guo Wei zhou Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Ji’nan 250353China

The high conductivity of electrocatalyst can eliminate the Schottky energy barrier at the interface of heterogeneous phases during an electrocatalytic reaction and accelerate the rapid electron transfer to the catalytic active ***,the electronic conductivity is a vital parameter for oxygen reduction reaction(ORR).Covalent triazine frameworks(CTFs)have shown great potential application as electrocatalysts in ORR with a merit of the diverse building ***,the intrinsic low conductivity and high impedance of CTFs could be significant setbacks in electrocatalytic ***,CTFs were constructed by introducing F and N co-modification for efficient 2e^(-)*** with the pristine CTF,the co-presence of F,N could increase the conductivity obviously by *** a result,F-N-CTF exhibits enhanced catalytic performance of H_(2)O_(2)generation and selectivity towards reaction *** work reveals the importance of conductivity optimization for CTFs and provides guidance for designing high conductivity non-metallic organic semiconductor catalysts for 2e^(-)ORR.

关键词： Covalent triazine frameworks Conductivity Co-modification Electrocatalysis Oxygen reduction reaction

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