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Comparative study of different machine learning models in landslide susceptibility assessment: A case study of Conghua District, Guangzhou, China

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China Geology 2024年第1期7卷 104-115页

作者： Ao Zhang xin-wen Zhao xing-yuezi Zhao Xiao-zhan Zheng Min Zeng Xuan Huang pan Wu Tuo Jiang Shi-chang Wang Jun He Yi-yong Li Wuhan Center China Geological SurveyMinistry of Natural Resources(Geosciences Innovation Center of Central South China)Wuhan 430205China Guangzhou Institute of Geological Survey Guangzhou 510080China Hubei Transportation Planning Design Institute Co. LtdWuhan 430050China

Machine learning is currently one of the research hotspots in the field of landslide *** clarify and evaluate the differences in characteristics and prediction effects of different machine learning models,Conghua District,which is the most prone to landslide disasters in Guangzhou,was selected for landslide susceptibility *** evaluation factors were selected by using correlation analysis and variance expansion factor *** four machine learning methods namely Logistic Regression(LR),Random Forest(RF),Support Vector Machines(SVM),and Extreme Gradient Boosting(XGB),landslide models were *** analysis and evaluation of the model were conducted through statistical indices and receiver operating characteristic(ROC)*** results showed that LR,RF,SVM,and XGB models have good predictive performance for landslide susceptibility,with the area under curve(AUC)values of 0.752,0.965,0.996,and 0.998,*** model had the highest predictive ability,followed by RF model,SVM model,and LR *** frequency ratio(FR)accuracy of LR,RF,SVM,and XGB models was 0.775,0.842,0.759,and 0.822,*** and XGB models were superior to LR and SVM models,indicating that the integrated algorithm has better predictive ability than a single classification algorithm in regional landslide classification problems.

关键词： Landslides susceptibility assessment Machine learning Logistic Regression Random Forest Support Vector Machines XGBoost Assessment model Geological disaster investigation and prevention engineering

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Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes

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Light(Science & Applications) 2024年第8期13卷 1623-1630页

作者： Guo-Jing Tang Xiao-Dong Chen Lu Sun Chao-Heng Guo Meng-Yu Li Zhong-Tao Tian Hou-Hong Chen Hong-Wei Wang Qi-Yao Sun Ying-Di pan xin-Tao He Yi-Kai Su Jian-Wen Dong School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

3-dB couplers,which are commonly used in photonic integrated circuits for on-chip information processing,precision measurement,and quantum computing,face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication *** address this,we introduce topological physics to nanophotonics,developing a framework for topological 3-dB *** couplers exhibit broad working wavelength range and robustness against fabrication dimensional *** leveraging valley-Hall topology and mirror symmetry,the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering *** analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 *** further propose a topological interferometer for on-chip distance measurement,which also exhibits robustness against dimensional *** extension of topological principles to the fields of interferometers,may open up new possibilities for constructing robust wavelength division multiplexing,temperature-drift-insensitive sensing,and optical coherence tomography applications.

关键词： topological splitting insensitive

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Efficient micrometer-scale thick-film perovskite solar cells with superior stability

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Rare Metals 2024年第4期43卷 1647-1657页

作者： Jian-Fei Hu Gang Chen Shun-Zhang Yu Yue-xin Lin Kai-Yu Wang Zong-Wei Li Guo-Dong Zhang Teng-Fei pan Ya-Jing Li Ming-Jie Li Ying-Dong Xia Yi-Fan Lv Yong-Hua Chen Key Laboratory of Flexible Electronics(KLoFE)and Institute of Advanced Materials(IAM) School of Flexible Electronics(Future Technologies)Nanjing Tech University(NanjingTech)Nanjing211816China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong999077China Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhen518057China Optics Valley Laboratory Hubei430074China

It is essential to enhance the thickness of the absorber layer for perovskite solar cells(PSCs)to improve device performance and reduce industry ***,thick perovskite films(>1μm)are difficult to be fabricated by employing traditional solvents,such as N,N-dimethylformamide(DMF),dimethyl sulfoxide(DMSO).Besides,it is a challenge to fabricate thick-film perovskite owing to the deteriorated surface morphology and serious defect ***,a simple method was reported to deposit uniform pinhole-free perovskite films with a thickness of more than 2μm utilizing the methylamine acetate(MAAc)ionic liquid as the *** with methylammonium chloride(MACl)as an additive,thick-film perovskite with~2μm in grain size and few grain boundaries(GBs)was prepared,which dramatically improved the perovskite crystal quality and enhanced carrier transport *** final PSCs exhibited a power conversion efficiency(PCE)of 20.16%.The device showed improved stability with 95%of its initial efficiency in a nitrogen environment over 5000 *** work provides an alternative strategy to produce extremely efficient and stable thick-film *** can be believed that this device has great potential in the application of large areas and laminated PSCs.

关键词： Perovskite solar cells Thick-film Stability Ionic liquid

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Cotton ethylene response factor Gh ERF91 is involved in the defense against Verticillium dahliae

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Journal of Integrative Agriculture 2024年第10期23卷 3328-3342页

作者： Nurimanguli Aini Yuanlong Wu Zhenyuan pan Yizan Ma Qiushuang An Guangling Shui panxia Shao Dingyi Yang Hairong Lin Binghui Tang xin Wei Chunyuan You Longfu Zhu Dawei Zhang Zhongxu Lin xinhui Nie Key Laboratory of Oasis Eco-agriculture Xinjiang Production and Construction Group/Agricultural CollegeShihezi UniversityShihezi 832003China National Key Laboratory of Crop Genetic Improvement/College of Plant Sciences&Technology Huazhong AgriculturalUniversityWuhan 430070China Cotton Research Institute Shihezi Academy of Agricultural ScienceShihezi 832011China Institute of Economic Crops Xinjiang Academy of Agricultural SciencesUrumqi 830091China

Verticillium dahliae causes significant losses in cotton *** reveal the mechanism of the defense response to *** in cotton,transcriptomic analyses were performed using cotton cultivars M138(***-resistant)and P2(***-susceptible).The results revealed 11,076 and 6,640 differentially expressed genes(DEGs)in response to ***,*** weighted gene co-expression network analysis of 4,633 transcription factors(TFs)indicated a“MEblue”module containing 654 TFs that strongly correlate with resistance to *** these TFs,the ethylene response factor Ghi_A05G10166(GhERF91)was identified as a putative hub gene with a defense response against ***.A virus-induced gene silencing assay and exogenous application of ethephon showed that GhERF91 is activated by ethylene and positively regulates the response to *** exposure in *** study provides fundamental transcriptome data and a putative causal gene(GhERF91)associated with resistance to ***,as well as genetic resources for breeding ***-resistant cotton.

关键词： cotton Verticillium wilt RNA-sequencing GhERF91 virus-induced gene silencing

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典型抗生素冲击对黄铁矿/硫基质反硝化修复体系的影响

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中国环境科学 2024年第2期44卷 793-802页

作者：曹惜霜信欣杨雯钰刘鑫潘先兵成都信息工程大学资源环境学院四川成都610225 北京师范大学地下水污染控制与修复教育部工程研究中心北京100875

为探究典型抗生素冲击对黄铁矿/硫混合基质(FeS_(2)/S^(0))修复体系反硝化过程的影响,本文以地下水中检出率较高的磺胺类(磺胺甲噁唑(SMZ)和磺胺嘧啶(SDZ))、氟喹诺酮类(恩诺沙星(ENR)和氧氟沙星(OFL))、四环素类(四环素(TCY)和土霉素(O... 详细信息

为探究典型抗生素冲击对黄铁矿/硫混合基质(FeS_(2)/S^(0))修复体系反硝化过程的影响,本文以地下水中检出率较高的磺胺类(磺胺甲噁唑(SMZ)和磺胺嘧啶(SDZ))、氟喹诺酮类(恩诺沙星(ENR)和氧氟沙星(OFL))、四环素类(四环素(TCY)和土霉素(OTC))及大环内酯类(红霉素(ERY)和螺旋霉素(SPM))作为典型抗生素,设置其浓度为100ng/L~500μg/L,建立模拟地下水微生态环境实验体系,分别研究其对FeS_(2)/S^(0)修复体系反硝化过程中氮素、可溶性总铁(TFe)、游离Fe^(2+)、硝酸盐还原酶(NAR)、亚硝酸盐还原酶(NIR)与电子传递活性(ETSA)等的变化特征,同时以无抗生素的体系作为空白対照组.结果表明,抗生素对各体系反硝化抑制作用与其种类及浓度密切相关:抑制程度依次为OFL (抑制率5.81%~27.73%)>ENR (3.06%~14.17%)、OTC (1.95%~14.25%)>SMZ (2.54%~11.75%)、SDZ (1.87%~10.90%)>TCY (1.98%~9.44%)、SPM (2.45%~9.43%)>ERY (2.13%~8.47%),抑制率和浓度呈正相关.各实验组中NO_(2)^(-)-N去除速率低于NO_(2)^(-)-N生成速率,NAR和NIR活性均呈现先增后降的单峰变化规律,其酶活峰值均低于空白组;各反应体系中SO_(4)^(2-)-S、TFe与Fe^(2+)浓度与NO_(3)^(-)-N去除率呈正相关,各浓度水平下OFL实验组对反硝化效能抑制最为显著.与空白组相比,各实验体系的ETSA值均有不同程度的下降,尤其是OFL胁迫体系的ETSA值下降幅度最大.硝酸盐还原动力学系数k表明,ng/L水平抗生素各反应体系中的k值差别不大,而μg/L浓度水平时,各反应体系中k值差异明显,OFL反应体系的k值明显低于其他反应体系.

关键词：地下水硝酸盐反硝化抗生素酶活性敏感性

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Spike N354 glycosylation augments SARS-CoV-2 fitness for human adaptation through structural plasticity

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National Science Review 2024年第7期11卷 80-94页

作者： pan Liu Can Yue Bo Meng Tianhe Xiao Sijie Yang Shuo Liu Fanchong Jian Qianhui Zhu Yuanling Yu Yanyan Ren Peng Wang Yixin Li Jinyue Wang xin Mao Fei Shao Youchun Wang Ravindra Kumar Gupta Yunlong Cao Xiangxi Wang CAS Key Laboratory of Infection and Immunity National Laboratory of MacromoleculesInstitute of BiophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Cambridge Institute of Therapeutic Immunology&Infectious Disease(CITIID) University of Cambridge Biomedical Pioneering Innovation Center(BIOPIC) Peking University Changping Laboratory Joint Graduate Program of Peking-Tsinghua-NIBS Academy for Advanced Interdisciplinary Studies Peking University Peking-Tsinghua Center for Life Sciences Tsinghua University Chinese Academy of Medical Sciences&Peking Union Medical College

Selective pressures have given rise to a number of SARS-CoV-2 variants during the prolonged course of the COVID-19 pandemic. Recently evolved variants differ from ancestors in additional glycosylation within the spike protein receptor-binding domain(RBD). Details of how the acquisition of glycosylation impacts viral fitness and human adaptation are not clearly understood. Here, we dissected the role of N354-linked glycosylation, acquired by BA.2.86 sub-lineages, as a RBD conformational control element in attenuating viral infectivity. The reduced infectivity is recovered in the presence of heparin sulfate, which targets the‘N354 pocket’ to ease restrictions of conformational transition resulting in a ‘RBD-up’ state, thereby conferring an adjustable infectivity. Furthermore, N354 glycosylation improved spike cleavage and cell–cell fusion, and in particular escaped one subset of ADCC antibodies. Together with reduced immunogenicity in hybrid immunity background, these indicate a single spike amino acid glycosylation event provides selective advantage in humans through multiple mechanisms.

关键词： coronavirus glycosylation viral fitness adjustable infectivity co-factor usage viral evolution conformational modulator

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基于单高速相机3D-DIC的涡轮叶片全场振动测量

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振动．测试与诊断 2024年第1期44卷 18-23,194页

作者：谢瑞丽许巍陈新潘兵北京航空航天大学航空科学与工程学院北京100191 中国航发北京航空材料研究院北京100195

采用成本较低、结构紧凑且使用便捷的单高速相机三维数字图像相关方法(single-camera high-speed three-dimensional digital image correlation,简称SCHS 3D-DIC)对涡轮叶片的振动特性进行试验研究。首先,介绍了测量装置和原理,以悬臂... 详细信息

采用成本较低、结构紧凑且使用便捷的单高速相机三维数字图像相关方法(single-camera high-speed three-dimensional digital image correlation,简称SCHS 3D-DIC)对涡轮叶片的振动特性进行试验研究。首先,介绍了测量装置和原理,以悬臂铝板为对象开展验证试验,结果证明了该测量系统的准确性与有效性;其次,开展了叶片的全场振动特性测量,得到了其三维形貌、模态特性、全场位移与应变分布,获得了叶片在振动载荷作用下的高应变区域位置及应变分布特点。研究表明,SCHS 3D-DIC方法相比常规双高速相机3D-DIC方法具有更高的视场利用率,适合于细长型的涡轮叶片的振动测量试验。

关键词：数字图像相关涡轮叶片振动测量单高速相机模态试验

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新纠缠辅助量子MDS码的构造

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电子学报 2024年第1期52卷 288-297页

作者：汪盼王立启朱士信合肥工业大学数学学院安徽合肥230000

纠缠辅助量子纠错码是经典量子纠错码的推广,通过在接收者和发送者双方预先共享纠缠态的方式实现量子通信.由于预先共享纠缠态会造成额外的费用,如何构造具有较小预先共享纠缠态的纠缠辅助量子纠错码是一个有趣的问题.本文给出了有限域... 详细信息

纠缠辅助量子纠错码是经典量子纠错码的推广,通过在接收者和发送者双方预先共享纠缠态的方式实现量子通信.由于预先共享纠缠态会造成额外的费用,如何构造具有较小预先共享纠缠态的纠缠辅助量子纠错码是一个有趣的问题.本文给出了有限域Fq2上一类负循环码是厄米特对偶包含码的充分条件,通过研究其分圆陪集的结构性质,确定了不同数目的预先共享纠缠态的存在条件,并结合纠缠辅助量子纠错码的构造方法,构造了一些新的具有较小预先共享纠缠态的纠缠辅助量子Maximum-Distance-Separable(MDS)码.

关键词：分圆陪集负循环码纠缠辅助量子纠错码 MDS码

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Enhanced hydrogen evolution performance by 3D ordered macroporous Ru-CoP@NC electrocatalysts

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Rare Metals 2024年第3期43卷 1095-1107页

作者： Chen-Chen Zhang Sheng Wei Li-Xian Sun Yi-Fang Ouyang Fen Xu Hai-Liang Chu Hong-Gepan Li-xin Chen Xue-Zhang Xiao School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin541004China School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055GuangdongChina Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an710021China School of Materials Science and Engineering Zhejiang UniversityHangzhou310058China

Electrocatalytic water splitting coupled with sustainable energies is identified as an environmentally friendly and renewable strategy to generate high-quality hydrogen for the fuel ***,the main challenge is to develop high performance,low cost and chemically stable electrocatalysts to decline the energy barriers and enhance the sluggish kinetics of hydrogen evolution reaction(HER).Herein,a three-dimensional hierarchically ordered macroporous Ru-CoP@NC electrocatalyst(3DOM Ru-CoP@NC)derived from ordered macro-microporous metal-organic frameworks has been prepared using the precursor@template and double-solvent *** prepared 3DOM Ru-CoP@NC catalyst exhibits an overpotential of 15 mV(j=10 mA·cm^(-2))and a reaction Tafel slope of 38 mV·dec^(-1)in alkaline electrolyte,which are superior to commercial Pt@C ***,the overpotential and reaction Tafel slope of this catalyst in acidic media are 45 mV and 50 mV·dec^(-1),*** outstanding HER activities of 3DOM Ru-CoP@NC catalysts are ascribed to the 3D highly interconnectedreticular nanospaces that can increase effective reaction active *** N dope d carbon framework improves the electronic properties and ***,the strong interaction of Ru and CoP nanoparticles also boosts the HER *** results indicate that 3DOM Ru-CoP@NC catalysts with high catalytic activities have a broad application prospect in the future.

关键词： Hydrogen evolution reaction Template method 3D ordered macroporous Ru-CoP@NC

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脓毒症新生儿肠道菌群多样性及其与抗生素不良事件的相关性

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中国微生态学杂志 2024年第4期36卷 462-466,472页

作者：胡悠悠潘欣宁波大学科学技术学院生命科学与材料化学学院浙江宁波315300 台州市第一人民医院急诊科

目的探讨脓毒症新生儿肠道菌群多样性及其与新生儿抗生素不良事件的相关性。方法纳入2022年7月至2023年6月在我院NICU治疗的102例脓毒症新生儿为研究对象,根据患儿抗生素不良事件发生情况分为不良事件组和非不良事件组,收集患儿基础资... 详细信息

目的探讨脓毒症新生儿肠道菌群多样性及其与新生儿抗生素不良事件的相关性。方法纳入2022年7月至2023年6月在我院NICU治疗的102例脓毒症新生儿为研究对象,根据患儿抗生素不良事件发生情况分为不良事件组和非不良事件组,收集患儿基础资料,采用16S rDNA测序检测患儿肠道菌群,采用Logistic回归分析脓毒症新生儿肠道菌群多样性与患儿抗生素不良事件的关系。结果截至出生后28 d,29例患儿(28.4%)发生抗生素不良事件,纳入不良事件组,73例(71.6%)未发生抗生素不良事件,纳入非不良事件组。两组出生体重、抗生素暴露时间比较,差异具有统计学意义(P<0.05)。不良事件组的Chao1指数、ACE指数和Shannon指数较非不良事件组降低(P<0.05),Simpson指数升高(P<0.05)。PCA结果显示,两组患者肠道菌群的分布存在明显差异。不良事件组肠道菌群以肠球菌属(Enterococcus)、克雷伯菌属(Klebsiella)和链球菌属(Streptococcus)为主要优势菌群,非不良事件组以拟杆菌门(Bacteroidetes)、埃希菌-志贺菌属(Escherichia-Shigella)、葡萄球菌属(Staphylococcus)、副拟杆菌属(Parabacteroides)和双歧杆菌属(Bifidobacterium)为主要优势菌群。Logistic回归分析显示,抗生素暴露时间(OR=2.975,P=0.045)为影响脓毒症新生儿抗生素不良事件的独立危险因素,Chao1指数(OR=0.955,P=0.038)和Shannon指数(OR=0.020,P=0.007)为影响脓毒症新生儿抗生素不良事件的保护因素。结论脓毒症新生儿抗生素暴露时间、肠道菌群的多样性与抗生素不良事件有相关性。

关键词：脓毒症肠道菌群抗生素不良事件新生儿

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