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Predicting the efficiency of arsenic immobilization in soils by biochar using machine learning

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Journal of Environmental Sciences 2025年第1期147卷 259-267页

作者： jin-Man Cao Yu-qian Liu Yan-qing Liu Shu-Dan Xue Hai-Hong Xiong Chong-Lin Xu qi Xu Gui-Lan duan State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450052China University of Chinese Academy of Sciences Beijing 100049China

Arsenic(As)pollution in soils is a pervasive environmental *** immobilization offers a promising solution for addressing soil As *** efficiency of biochar in immobilizing As in soils primarily hinges on the characteristics of both the soil and the ***,the influence of a specific property on As immobilization varies among different studies,and the development and application of arsenic passivation materials based on biochar often rely on empirical *** enhance immobilization efficiency and reduce labor and time costs,a machine learning(ML)model was employed to predict As immobilization efficiency before biochar *** this study,we collected a dataset comprising 182 data points on As immobilization efficiency from 17 publications to construct three ML *** results demonstrated that the random forest(RF)model outperformed gradient boost regression tree and support vector regression models in predictive *** importance analysis and partial dependence plots based on the RF model were conducted to identify the most crucial factors influencing As *** findings highlighted the significant roles of biochar application time and biochar pH in As immobilization efficiency in ***,the study revealed that Fe-modified biochar exhibited a substantial improvement in As *** insights can facilitate targeted biochar property design and optimization of biochar application conditions to enhance As immobilization efficiency.

关键词： Biochar Arsenic immobilization Soil Machine learning

Distribution and mapping of temperate savanna in the sandy lands of eastern China

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Science China Earth Sciences 2025年第1期68卷 128-141页

作者： Xiaoya LI Feng WANG Tao duan Kaijie YANG Bin YANG Chunmei WANG Xin TIAN qi LU Institute of Ecological Conservation and Restoration Institute of Desertification StudiesChinese Academy of ForestryBeijing100091China Institute of Desertification Institute of Desertification StudiesChinese Academy of ForestryBeijing100091China Institute of Great Green Wall Bayan Nur015200China Satellite Application Centre for Ecology and Environment MEEBeijing100094China Institute of Microelectronics Chinese Academy of SciencesBeijing100029China Aerospace Information Research Institute Chinese Academy of SciencesBeijing100094China Institute of Forest Resource Information Techniques Chinese Academy of ForestryBeijing100091China

Savannas are distributed globally across various *** perform a significant socioeconomic role in regulating net primary productivity and the terrestrial carbon *** to the high spatial heterogeneity induced by the mixed distribution of trees and grasses,current global land-cover classification maps often classify savannas as forests or grasslands Temperate savannas in China cover a vast area,yet their spatial patterns and extent remain poorly *** study developed a novel remote sensing temperate savannas mapping method by integrating very high-resolution(VHR)unmanned aerial vehicle(UAV)and GF-6 satellite imagery based on the vegetation structure characteristics of temperate savannas using the FAO definition of *** and validation datasets were collected from VHR UAV imagery covering the main temperate savannah types with a ground area of 1818 *** fractional woody vegetation cover(FWVC)and fractional herbaceous vegetation cover(FHVC)in temperate savannas were estimated by integrating Classification and Regression Tree and Random Forest *** current distribution of temperate savannas in the Horqin and Otindag Sandy Lands of Eastern China was mapped to a unit area of 0.5 *** root-mean-square error(RMSE)values for the FWVC and FHVC models were 10.69%and 11.67%,and the R^(2)values were 0.66 and 0.63,*** assessment indicated that the new temperate savanna map had high identification accuracy,with a Kappa coefficient of 0.70,overall accuracy of 0.88,and average accuracy of *** savannas in the sandy lands of eastern China were primarily distributed in the northern Horqin Sandy Land the central and eastern regions of the Otindag Sandy Land,and the transition zone from the southern slopes of the Greater Khingan Mountains to the plains,covering a total area of 3.27×10^(6)*** main savannah types were elm,oak/maple,and shrub *** savannas were widely distributed in the Otindag Sandy Land a

关键词： Temperate savanna UAV imagery GF-6 Fractional woody vegetation cover Fractional herbaceous vegetation cover Machine learning

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Hydrogen-enhanced light-induced thermoelastic spectroscopy sensing

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Photonics Research 2025年第01期13卷 194-200页

作者： YING HE YUANZHI WANG SHUNDA qiAO XIAOMING duan HONG qi YUFEI MA National Key Laboratory of Laser Spatial Information Harbin Institute of Technology School of Energy Science and Engineering Harbin Institute of Technology

A hydrogen（）-enhanced light-induced thermoelastic spectroscopy（LITES） sensor is proposed for the first time, to our knowledge, in this paper. The enhancement with H2significantly reduces the resonance damping of a quartz tuning fork（QTF）, leading to a 2.5-fold improvement in the quality factor（Q-factor） to 30,000 without introducing additional noise into the LITES sensor system. Based on the H2-enhancement effect, a self-designed round-head QTF with a low resonance frequency（f0） of 9527 Hz and a fiber coupled multipass cell（MPC）with an optical length of 40 m were utilized to increase the energy accumulation time of QTF and the optical absorption of the target gas, respectively, to demonstrate an ultra-highly sensitive C2H2-LITES sensor. The longterm stability of the H2-enhanced C2H2-LITES sensor was investigated based on Allan deviation analysis. With an optimal integration time of 140 s, the minimum detection limit（MDL） was improved to 290 parts per trillion（ppt）. Compared to other reported state-of-the-art C2H2-LITES techniques with similar parameters, this sensor shows a 241-fold improvement in the MDL. This H2-enhancement technique proves to be a highly effective method for achieving a high Q-factor QTF, characterized by its simplicity and efficiency. It offers substantial potential for applications in QTF-based gas sensing.

关键词： High power lasers Hydrogen Optical absorption Photoacoustic effect Photoacoustic spectroscopy Sensor performance

Microstructure characteristics and corrosion behavior of metal inert gas welded dissimilar joints of 6005A modified by Sc and 5083 alloys

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中国有色金属学报 2025年第1期35卷 60-76页

作者： Guo-fu XU Liang LIU Ying DENG Yu ZENG Jun-chang CAO Lei TANG Xiao-yan PENG Jia-qi duan Mei-chan LIANG qing-lin PAN School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Power Metallurgy Central South UniversityChangsha 410083China Baoshan Iron&Steel Co. Ltd.Shanghai 201900China Warwick Manufacturing Group The University of WarwickCoventryCV47ALUK Guangdong Weiye Aluminum Factory Group Co. Ltd.Foshan 528000China

The corrosion behavior and microstructure characteristics of metal inert gas(MIG)welded dissimilar joints of the 6005A alloy modified with Sc(designated as 6005A+Sc)and the 5083 alloy were investigated using corrosion tests and microscopy *** show that the dissimilar joints exhibit strong stress corrosion cracking(SCC)resistance,maintaining substantial strength during slow strain rate tensile ***,the heat-affected zone(HAZ)and base metal(BM)on the 6005A+Sc side show superior performance in terms of inter-granular corrosion(IGC)and exfoliation corrosion(EXCO)compared to the corresponding zones on the 5083 *** lower corrosion resistance of the 5083-BM and the 5083-HAZ can be attributed to the presence of numerous Al_(2)Mg_(3)phases and micro-scaled Al_(6)(Mn,Fe)intermetallics,mainly distributed along the rolling ***,the enhanced corrosion resistance of the 6005A+Sc-BM and the 6005A+Sc-HAZ can be attributed to the discontinuously distributed grain boundary precipitates(β-Mg_(2)Si),the smaller grain size,and the reduced corrosive current density.

关键词： metal inert gas welding dissimilar joint aluminum alloy corrosion,microstructure

Dynamic equivalence conditions for an air-bearing simulator emulating scaled drag-free control dynamics

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Acta Mechanica Sinica 2025年第1期41卷 192-210页

作者： Mingwei Chen Chu Zhang Jianwu He Chao Yang Li duan qi Kang Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100190China

The ground-based experimental tests are crucial to verify the related technologies of the drag-free *** work presents a design method of the ground simulator testbed for emulating the planar dynamics of the space drag-free *** this paper,the planar dynamic characteristics of the drag-free satellite with double test masses are analyzed and nondimensionalized.A simulator vehicle composed of an air bearing testbed and two inverted pendulums is devised on the basic of equivalent mass and equivalent stiffness proposed firstly in this *** the dynamic model of the simulator equivalent to the sensitive axis motion of the test mass and the planar motion of the satellite is derived from the Euler-Lagrange ***,the dynamic equivalence conditions between the space prototype system and the ground model system are derived from Pi *** satisfy these conditions,the scaling laws of two systems and requirements for the inverted pendulum are put ***,the corresponding control scaling laws and a closed-loop control strategy are deduced and applied to establishing the numerical simulation experiments of underactuated ***,the comparative simulation results demonstrate the similarity of dynamical behavior between the scaled-down ground model and the space *** a result,the rationality and effectiveness of the design method are proved,facilitating the ground simulation of future gravitational wave detection satellites.

关键词： Drag-free satellite Ground simulation Pi theorem Dynamical similarity Scaling law

Single-cell omics: experimental workflow, data analyses and applications

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Science China(Life Sciences) 2025年第1期68卷 5-102页

作者： Fengying Sun Haoyan Li Dongqing Sun Shaliu Fu Lei Gu Xin Shao qinqin Wang Xin Dong Bin duan Feiyang Xing Jun Wu Minmin Xiao Fangqing Zhao jing-Dong J.Han qi Liu Xiaohui Fan Chen Li Chenfei Wang Tieliu Shi Department of Clinical Laboratory the Affiliated Wuhu Hospital of East China Normal University(The Second People’s Hospital of Wuhu City)Wuhu 241000China Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration(Tongji University) Ministry of EducationOrthopaedic DepartmentTongji HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200082China Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji UniversityShanghai 200092China Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200082China Research Institute of Intelligent Computing Zhejiang LabHangzhou 311121China Shanghai Research Institute for Intelligent Autonomous Systems Shanghai 201210China Center for Single-cell Omics School of Public HealthShanghai Jiao Tong University School of MedicineShanghai 200025China National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314103China Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghai 200241China Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology(CQB)Peking UniversityBeijing 100871China Zhejiang Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases Women’s HospitalZhejiang University School of MedicineHangzhou 310006China Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal U

Cells are the fundamental units of biological systems and exhibit unique development trajectories and molecular *** exploration of how the genomes orchestrate the formation and maintenance of each cell,and control the cellular phenotypes of various organismsis,is both captivating and *** the inception of the first single-cell RNA technology,technologies related to single-cell sequencing have experienced rapid advancements in recent *** technologies have expanded horizontally to include single-cell genome,epigenome,proteome,and metabolome,while vertically,they have progressed to integrate multiple omics data and incorporate additional information such as spatial scRNA-seq and CRISPR ***-cell omics represent a groundbreaking advancement in the biomedical field,offering profound insights into the understanding of complex diseases,including ***,we comprehensively summarize recent advances in single-cell omics technologies,with a specific focus on the methodology *** overview aims to guide researchers in selecting appropriate methods for single-cell sequencing and related data analysis.

关键词： single-cell sequencing genome epigenome proteomics metabolomics multimodal spatial transcriptomics CRISPR screening

Multiple primary cancers with gastrointestinal malignant tumors as the first manifestation:Three case reports and review of literature

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World Journal of Gastroenterology 2025年第8期31卷 130-139页

作者： Xin-Ran Bi Shuang-Yan Zhao Yu-qi Ma Xiao-Yu duan Ting-Ting Hu Lian-Zhu Bi Hong-Yi Cai The First Clinical Medical College of Gansu University of Traditional Chinese Medicine Lanzhou 730000Gansu ProvinceChina Department of Radiotherapy Center Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina Department of Gastrointestinal Surgery Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina Department of Neurology Hospital of Fengnan DistrictTangshan 063300Hebei ProvinceChina

BACKGROUND The incidence of malignant gastrointestinal(GI)tumors is increasing,and advancements in medical care have significantly improved patient survival *** a result,the number of cases involving multiple primary cancers(MPC)has also *** rarity of MPC and the absence of sensitive and specific dia-gnostic markers often lead to missed or incorrect *** is,therefore,of vital importance to improve the vigilance of clinicians and the accurate diagnosis of this *** with GI malignancies face a higher relative risk of deve-loping additional primary malignant tumors compared to those with other systemic *** monitoring and follow-up are crucial,especially for high-risk groups,which include older adults,men,those with addictions to alcohol and tobacco,those with a family history of tumors,and those who have undergone *** SUMMARY In this article,we report three cases of MPC,each involving malignant tumors of the GI tract as the initial primary carcinoma,offering insights that may aid in effectively managing similar *** Patients with GI malignancies face a higher MPC *** screening and follow-up protocols may enhance detection and treatment outcomes.

关键词： Multiple primary cancer Gastrointestinal tract Synchronous Metachronous Case report

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冷却流量偏差对超燃冲压发动机飞行速域影响

航空动力学报 2025年第1期40卷 21-34页

作者：姜俞光戚永健段艳娟鲍文范玮西北工业大学动力与能源学院西安710072 西安航天动力技术研究所固体推进全国重点实验室西安710025 哈尔滨工业大学能源科学与工程学院哈尔滨150001

针对碳氢燃料流量偏差问题对超燃冲压发动机马赫数许用上限影响的问题,建立准一维燃烧与冷却耦合模型,同时对其进行了验证,作为总体分析工具;仿真结果表明:超燃冲压发动机工作范围受流量偏差的影响,以流量偏差β=-0.5为例,流量偏差将使... 详细信息

针对碳氢燃料流量偏差问题对超燃冲压发动机马赫数许用上限影响的问题,建立准一维燃烧与冷却耦合模型,同时对其进行了验证,作为总体分析工具;仿真结果表明:超燃冲压发动机工作范围受流量偏差的影响,以流量偏差β=-0.5为例,流量偏差将使得发动机飞行马赫数上限从Ma=6降低至Ma=5,说明流量偏差将严重限制发动机的安全运行速域,影响飞行任务;通过对比分析不同燃烧与冷却设计,如逆流冷却、两点喷油、偏差起始位置、最大许用壁温/油温等,对飞行马赫数上限的影响机制,发现其可减弱流量偏差,拓宽发动机工作范围;最后基于分级节流流量偏差抑制方法的试验数据,分析了此方法拓宽发动机工作范围的能力,发动机工作速域上限整体拓宽接近1个马赫数范围。

关键词：碳氢燃料再生冷却流量偏差飞行马赫数发动机性能超燃冲压发动机

Fe_(n)Mo_(38-n)(n=0-38)及Fe_(n)Mo_(55-n)(n=0-55)双金属团簇的结构演化和基态能量

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原子与分子物理学报 2025年第3期42卷 85-93页

作者：郑琪琪陈轩程彪段海明新疆大学物理科学与技术学院乌鲁木齐830017

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存... 详细信息

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存在类O_(h)结构、类I_(h)结构和无序结构间的竞争.对于Fe_(n)Mo_(55-n)(n=0-55)团簇,随Fe原子数的增加,Fe原子优先占据团簇中心位置,再依次占据表面顶点、棱边和次外层,双金属团簇基态构型主要体现为在Mackay二十面体基础上的结构畸变.Fe_(24)Mo_(14),Fe_(13)Mo_(42)和Fe_(43)Mo_(12)为幻数结构团簇,研究发现双金属团簇幻数成因不能通过单质团簇常用的平均配位数和平均键长模型解释,它更多的归咎于组分效应导致的结构高对称性.

关键词：双金属团簇结构和能量淬火算法遗传算法

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