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摘要: Graphite carbon nitride has many excellent properties as a two-dimensional semiconductor material so that it has a wide application prospect in the field of photocatalysis. However, the traditional problems such as high recombination rate of photogenerated carriers limit its application. In this work, we introduce nitrogen deficiency into g-C3N4 to solve this problem a simple and safe in-situ reduction method. g-C3N4/CaCO3 was obtained by a simple and safe one-step calcination method with indust关键词: Photocatalytic;g-C;3;N;4;Cyano group;Catalytic fiber;Nicotine degradation
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摘要: The nirS-type denitrifying bacterial community is the main drivers of the nitrogen loss process in drinking water reservoir ecosystems. The temporal patterns in nirS gene abundance and nirS-type denitrifying bacterial community harbored in aerobic water layers of drinking water reservoirs have not been studied well. In this study, quantitative polymerase chain reaction (qPCR) and Illumina Miseq sequencing were employed to explore the nirS gene abundance and denitrifying bacterial community struc关键词: Drinking water reservoirs;Aerobic water layers;Denitrifying bacterial community;NirS; gene;Co-occurrence network model
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Rao Jiahuan;Ye Peiyu;Lu Jie;Chen Bi;Li Nan;Zhang Huiying;Bo Hui;Chen Xinchun;Liu Huiting;Zhang Chunhong;Wei Hua;Wu Qin;Yan Yinkun;Li Changgui;Mi Jie;
Annals of medicineVolume 54, Issue 1, 2022, PP 1608-1615
摘要: BACKGROUND AND AIMS(#br) Hyperuricaemia can lead to gout and is associated with an increased risk of cardiometabolic disease. We aimed to investigate the prevalence of hyperuricaemia and its related factors in Chinese children and adolescents. (#br)METHODS(#br) We pooled data from 11 population-based studies comprising 54,580 participants aged 3-19 years. The sex- and age-standardized prevalence of hyperuricaemia was estimated overall and by sex, age, weight status, geographic region and survey 关键词: Children;adolescents;hyperuricaemia;prevalence;uric acid
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Yu Lu-Dan;Li Nan;Tong Yuan-Jun;Han Jiajia;Qiu Junlang;Ye Yu-Xin;Chen Guosheng;Ouyang Gangfeng;Zhu Fang;
Trends in Analytical ChemistryVolume 156, Issue , 2022, PP
摘要: Complex chemicals, either anthropogenically released or naturally produced, exist in the environment and act as exogenous threats to living organisms. Meanwhile, numerous endogenous active components occurring in living organisms are vital indicators of physiological and biological functions. Conventional in vitro sampling methodologies may lack the ability to accurately reveal the processes of exogenous and endogenous substances in living organisms, especially for transient, variable, or unstab关键词: In vivo; sampling;Microdialysis;Solid-phase microextraction;Exogenous/endogenous substances
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摘要: A modified relaxation two-sweep modulus-based matrix splitting iteration method is proposed by using relaxation techniques and the two-sweep scheme for the solution of implicit complementarity problems. The sufficient conditions for convergence of the proposed method are established when the coefficient matrix is a positive definite matrix and an H+-matrix, respectively. Numerical experiments are presented to show the efficiency of the proposed method, which is superior to the modified modulus-b关键词: Implicit complementarity problems;Modulus-based iteration method;Two-sweep;Relaxation;Convergence
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摘要: Characterizing the vertical distribution of total phosphorus (P) and P forms in streambanks can improve estimates of P loads to streams via bank erosion. Using a systematic literature review, this meta-analysis evaluated the vertical distribution of total P (Ptot), Bray-1 test P (PBray1), oxalate-extractable P (Pox), degree of P saturation (DPSox), and soil P storage capacity (SPSC) at 161 streambank locations encompassing diverse soil orders and riparian land covers. Across studies, maximum soi关键词: Streambanks;Soil phosphorus stratification;Pedogenic weathering;Fluvial erosion and deposition;Riparian land cover
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摘要: Metamaterials that can tune the bandgap by controlling the configuration have prospects for the security of engineering structures. A configuration-controllable metamaterial is developed in this study to achieve effective vibration reduction, and its bandgap characteristics are investigated through experiments and numerical analysis. The metamaterial specimen is designed and fabricated using silicone rubber. A corresponding experimental platform is constructed to achieve a controllable configura关键词: Configuration-controllable metamaterial;Bandgap characteristics;Vibration reduction
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Li Nan;Zhu Qiuhui;Liu Guimei;Zhao Qi;Lv Haiqin;Yuan Mingzhe;Meng Qingguo;Zhou Yingtang;Xu Jingkun;Wang Chuanyi;
Journal of Materials Science & TechnologyVolume 122, Issue , 2022, PP 91-100
摘要: Photocatalysts with exposure of different crystal facets often show great differences in their photocatalytic activities due to differences in surface atomic arrangement and coordination. Thus, the actual photoreaction mechanism of a specific crystal facet in photocatalysis deserves to be explored. In this paper, as a case study, SrBi2Ta2O9 photocatalyst with preferential facet exposure was explored for the photocatalytic removal of NO at a ppb level. The efficiency of NO removal was remarkably 关键词: SrBi;2;Ta;2;O;9;NO removal;Facet exposure;Photocatalysis;DFT computation
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摘要: Autophagy inhibition can limit the growth of established tumors and improve the response to tumor therapeutics. However, in complex dynamic process of catabolic lysosomal degradation, a single specific inhibition of autophagy results in limited effect. Here, we prepared ultra-small rhodium-methoxypolyethylene glycol-S-Nitrosothiols nanoparticles (uRh-mSNO NPs) to realize amplified autophagy inhibition effect through a “pursuit and interception” (as the game of “Go”) strategy for tumor therapy. I关键词: Amplified autophagy inhibition;Ultra-small rhodium nanoparticles;Free radical cascade reaction;Pursuit and interception
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Brooks Richard A.;Wang Hongyan;Ding Zerong;Xu Jie;Song Qinghua;Liu Haibao;Dear John P.;Li Nan;
摘要: Continuous fibre-reinforced thermoplastics (FRTPs) are replacing metals in certain applications in the aerospace industry due to their superior properties e.g., high strength-to-weight ratio and good fatigue resistance. Adopting these lightweight materials in vehicles is a solution for improving vehicle efficiency across the transport industry. Among various manufacturing techniques for FRTP parts, stamp forming is one of the most advantageous when small structures and mass production are target关键词: Continuous fibre-reinforced thermoplastics;Stamp forming;Deformation mechanisms;Defects;Process parameters
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摘要: In the present work, we propose a novel method to decrease the pore size as well as to enhance the strength of microporous Al2O3-MgAl2O4 refractory raw materials, which were prepared by the vacuum impregnation treatment of porous Al2O3 powders with at MgCl2 solution. The effect of the MgCl2 content (0–32.5 wt%) on the phase distribution, microstructures, and physical properties of the refractory raw materials was thoroughly investigated. The results demonstrated that the sub-micron pore structur关键词: Microporous Al;2;O;3;-MgAl;2;O;4; refractory raw materials;Vacuum impregnation treatment;Microstructures;Pore size;Strength
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摘要: Encapsulating nano zero-valent iron particles with biomass-derived carbon is a promising strategy to achieve efficient uranium extraction by avoiding agglomeration and oxidation of nano zero-valent iron. Herein, we develop distinctive carbon-encapsulated nano zero-valent iron particles with konjac glucomannan-derived carbon aerogel for reduction-assisted uranium extraction. The nano zero-valent iron particles encapsulated in konjac glucomannan-derived carbon are composed of γ-Fe and a small part关键词: Uranium;Adsorption;Reduction;Nano zero-valent iron;Konjac glucomannan-derived carbon
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摘要: We performed multiscale-multiphysics simulations for W, Mo and Cu nanotips under high electric field to investigate their structural evolution and thermal runaway process. The critical electric field values for the electric prebreakdown condition are predicted to be 311 MV m−1, 570 MV m−1 and 675 MV m−1 for Cu, Mo and W nanotips respectively (R 0 = 1 nm, H 0 = 100 nm). The boiling point of the metal is found to be a good predictor of the critical electric field strength for the initiation of the关键词: vacuum breakdown;refractory metal nanotips;thermal runaway;space–charge-limited field emission
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摘要: 1T phase molybdenum disulfide (1T-MoS2) with metallic conductivity and excellent catalytic activity at edge sites towards hydrogen evolution reaction (HER) has been recognized as one of the most promising candidates for HER catalysis. However, the basal plane sites which account for the vast majority of sites are less active, resulting in limited activity of 1T-MoS2. In this case, improving the activity of basal planes appears to be a promising way to enhance overall HER activity. Herein, we rep关键词: 1T phase molybdenum disulfide;Nickel hydroxide;Heterogeneous structure;Hydrogen evolution reaction;Overall water electrolysis
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摘要: The optimal utilization of an energy storage system (ESS) is key to transforming energy systems from coal to renewable base. This study proposed a multi-objective optimization method for designing energy systems, a multi-criteria evaluation method for analyzing ESS and its suitability in an energy system, and a novel ESS scheduling strategy. A grid-connected energy system including wind power, photovoltaic, and ESSs was considered for responding to electricity demands, wherein multi-criteria ass关键词: Energy system design;Energy storage system (ESS);Scheduling strategy;Indicator analysis
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摘要: Metal-organic framework (MOF)-based composite hydrogel microspheres (MOF/hydrogel) are one of the most promising adsorbents for high-efficiency wastewater treatment. However, conventional MOF/hydrogel synthesis methods involve simple blending, which inevitably results in poor particle-polymer matrix interactions and particle agglomeration. In this work, inspired by the symbiotic relationships in nature, we successfully constructed a three-dimensional zeolitic imidazolate framework-8 (ZIF-8)/poly关键词: Metal-organic framework;Sodium alginate-kappa-carrageenan;Adsorption Antibiotic;Composite beads
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摘要: Solar light response photocatalysts have been extensively studied to alleviate energy crisis and solve environmental pollution problems. Herein, polymerized iron phthalocyanine (FePPc) was prepared and then compounded with graphitic carbon nitride (g-C3N4) by ball milling to obtain FePPc/g-C3N4 composite photocatalyst. During the ball milling process, FePPc was mechanically exfoliated and compounded with g-C3N4, which the binding mode mainly relied on π-π stacking interaction with each other. Ca关键词: Polymeric iron phthalocyanine;g-C;3;N;4;Photodegradation;CO;2; reduction;Mechanism
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摘要: In this work, a facile and effective method for assembly and transfer nanoparticles on thin layer chromatography (TLC) plate was proposed and used to combined with layer chromatography-surface-enhanced Raman spectroscopy (TLC-SERS) strategy for detection of Rhodamine B and Sudan I. First, Monodispersed Ag NCs with broadly tunable diameters (from 41 to 67 nm) and 7.25 × 105 maximum actual enhancement factor (AEF) were successfully prepared and systematically investigated for its optic 关键词: Assembly strategy;Thin layer chromatography;Surface-enhanced Raman scattering;Au@Ag NCs;Sudan I;Rhodamine B;Chili oil
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摘要: Metal–organic frameworks (MOFs) with high porosity and variable structure have attracted extensive attention in the field of electrochemistry, but their poor conductivity and stability have limited their development. Materials derived from MOFs can maintain the structural diversity and porosity characteristics of MOFs while improving their electrical conductivity and stability. Metal phosphides play an important role in electrochemistry because they possess rich active sites, unique physicochemi关键词: Metal–organic frameworks;Metal phosphides;Electrochemistry
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摘要: With the growth in population over the past decades, China’s food demand has been increasing. However, crops are facing greater water stress with the rising temperature and increasing drought in future. Therefore, identifying potential crop yield and its driving factors is necessary to ensure continued food production. In the present study, we estimated the potential yields of maize and wheat in China, with and without water limits, from 1985 to 2015 using a simple generic crop model (SIMPLE). W关键词: Yield gap;Yield potential;Climate change;Maize;Wheat
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摘要: Moso bamboo forests (MBFs) exhibit unique phenological phenomena, such as on-/off-years, which play an important role in regulating the sustainable management of MBF ecosystems. With human disturbance, on- and off-year effects occur at both spatial and temporal scales. Quantifying the spatial pattern of MBF performance remains a challenge because of physiological and ecological complexity, regional policy differences and human management intensity. In this paper, three zones (Anji, Guangde and Y关键词: Moso bamboo forest;Sentinel-2;On-year and off-year;Spatial pattern;MODI
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Jiang Zheng;Thakur Madhav P.;Liu Ruiqiang;Zhou Guiyao;Zhou Lingyan;Fu Yuling;Zhang Peipei;He Yanghui;Shao Junjiong;Gao Jing;Li Nan;Wang Xinxin;Jia Shuxian;Chen Yang;Zhang Chunxiu;Zhou Xuhui;
Soil Biology and BiochemistryVolume 171, Issue , 2022, PP
摘要: Root exudates determine plant's ability to acquire nutrients through influencing plant's interactions with soil microorganisms. Recent studies suggest that plant's associations with beneficial soil microorganisms explain variation in root exudation as plants opt to minimize the exudation cost through such symbiosis. Yet, we have a poor understanding of whether plants change their exudation rates through mycorrhizal symbiosis in soil environments with varying resource availability. Here, we repor关键词: Root exudation;Mycorrhizal type;Root functional traits;Plant nutrient economy;Subtropical forests
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Mao Aofei;Fan Peixun;Constantin Loic;Li Nan;Huang Xi;Cui Bai;Silvain Jean-Francois;Wang Xinwei;Lu Yong Feng;
Applied Materials TodayVolume 28, Issue , 2022, PP
摘要: Controllable transformations from two-dimensional (2D) patterns to three-dimensional (3D) geometries independent of materials or external stimuli are being pursued in numerous fields. Here, we present an approach to forming various 3D structures through 2D printing using distributed stress inside a polymer. The key is to establish controlled stress fields by introducing composition and property gradients inside a photocurable polymer by femtosecond laser two-photon polymerization. Structural def关键词: Controllable 2D-3D transformation;Self-shaping;Two-photon polymerization;Femtosecond laser micro/nano manufacturing;Anisotropic shrinkage;Stress control;TPP;fs;2D;3D;2D-3D;LP;SS;HD;SD;DoC;SEM
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摘要: This work using the first-principles theory studies the Ni-doping behavior on the pristine HfSSe monolayer and the potential of Ni-doped HfSSe (Ni-HfSSe) monolayer for HCHO and C2H3Cl detection in the dry-type reactors. Results indicates that the Ni dopant is more likely to be doped on the Se-surface, and the formation energy (Ef) is 0.99 eV. The most stable configurations for gas adsorption and Hirshfeld analysis reveal the better adsorption behavior in the HCHO system with the adsorption energ关键词: Janus HfSSe;Toxic gases;Sensing property;First-principles theory
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摘要: We previously discovered that the SPC/Fyn/Rho-kinase (ROK) pathway mediates the Ca2+-sensitization of coronary arterial smooth muscle (CASM) contraction leading to vasospasm, a major cause of sudden death. Lately, we have been trying to find and develop more natural edible compounds which can treat and/or prevent the SPC-induced abnormal CASM contraction, and finally the first to discover that tangeretin (5,6,7,8,4′-pentamethoxyflavone), a natural compound extracted from citrus plants关键词: Sphingosylphosphorylcholine (SPC);Fyn;Rho-kinase (ROK) activation;Tangeretin;Citrus flavone
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摘要: This study aimed to (a) reliably obtain intermittency periods (i.e., time gaps between incarcerations) using days as the unit of time and (b) investigate the effects of mental health needs assessed during the first incarceration on the hazard of subsequent reincarcerations among justice-involved youth (JIY). The multiyear administrative data from Harris County, TX, contained 28,255 JIY who were followed up until 18 years of age. There was a progressive shortening of the time gaps between incarce关键词: survival analysis;criminal career;intermittency;mental health;PWP model;incarceration
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Li Nan;Zhang Yansong;Guo Rui;Yang Junjie;Zhang Xinyan;Wang Xiang;
FuelVolume 320, Issue , 2022, PP
摘要: To explore the effect of stearic acid coating on the explosion characteristics of aluminum dust, the flame propagation characteristics, minimum explosion concentration and explosion overpressure characteristics of aluminum (Al) and stearic acid coated aluminum dust (SA-Al) were studied by using the synchronous thermal analyzer, the improved Hartmann tube explosion test device, and 20 L explosion test device. Then micro morphology and composition of the explosion products were determined by scann关键词: Dust explosion;Stearic acid coated aluminum dust;Aluminum dust;Pyrolytic oxidation;Explosion characteristics
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摘要: Stormflow runoff is an important non-point source of pollution in drinking water reservoirs. Rationally managed flood discharge processes at estuaries can reduce the high concentration of pollutants carried by runoff, and thus their impacts on water plant operations. In this study, the physical and chemical water quality parameters upstream from a dam were measured for a flood discharge process in the Jinpen Reservoir of Northwest China. The results showed that the time needed for the flood to r关键词: Flood discharge;Drinking water reservoir;Flood management strategies;Venting efficiency
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摘要: Mullite foamed ceramics were prepared by direct-foaming methods in parallel with a mechanical activation technique (ball-milling process) using white clay and industrial alumina as raw materials. The effect of the alumina by the mechanical activation technique on the performances of the foamed ceramics was investigated by the XRD, SEM, micro focus X-ray computed tomography, and finite element simulation. The results showed that: the smaller particle size obtained by the mechanical activation tec关键词: Mullite foamed ceramics;Mechanical activation techniques;Compressive strength;Thermal conductivity;Finite element simulation
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Xia Xuan;Pan Xizhou;Li Nan;He Xing;Ma Lin;Zhang Xiaoguang;Ding Ning;
NeurocomputingVolume 493, Issue , 2022, PP 497-535
摘要: Supervised learning algorithms have shown limited use in the field of anomaly detection due to the unpredictability and difficulty in acquiring abnormal samples. In recent years, unsupervised or semi-supervised anomaly-detection algorithms have become more widely used in anomaly-detection tasks. As a form of unsupervised learning algorithm, generative adversarial networks (GAN/GANs) have been widely used in anomaly detection because GAN can make abnormal inferences using adversarial learning of 关键词: Deep learning;Generative adversarial nets;Anomaly detection;Adversarial learning and inference;Representation learning
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