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Effect of dissolved organic matter on the toxicity of chlorotoluron to Triticum aestivum

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Journal of Environmental Sciences 2006年第1期18卷 101-108页

作者： SONG Ning-hui yang Zhi-min ZHOU Li-xian WU Xin yang hong College of Science Nanjing Agricultural University Nanjing 210095 China College of Life Science Nanjing Agricultural University Nanjing 210095 China College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China

Response of two wheat cultivars （Triticum aestivum cv. YM 158 and NM 9） to the herbicide chlorotoluron and the effect of two forms of dissolved organic matter on the chlorotoluron toxicity to the plants were characterized. Treatment with chlorotoluron at 10-50 μg/ml inhibited the seed germination and a dose-response was observed. The inhibition of seed germination was correlated to the depression of a-amylase activities. To identify whether chlorotoluron induced oxidative damage to wheat plants, the malondlaldehyde （MDA） content and electrolyte leakage were measured. Results showed that both MDA content and electrolyte leakage in the chlorotoluron-treated roots significantly increased. Activities of several key enzymes were measured that operate in citric acid cycle and carbohydrate metabolic pathway. Inhibited activities of citrate synthase and NADP-isocitrate dehydrogenase were observed in the chlorotoluron-treated roots as compared to control plants. We also examined malate dehydrogenase and phosphoenolpyruvate carboxylase in wheat roots exposed to 30 μg/ml chlorotoluron, liowever, none of the enzymes showed significant changes in activities. Application of 160 μg/ml dissolved organic matter （DOM） extracted from non-treated sludge（NTS） and heat-expanded sludge （lIES） in the medium with 30 μg/ml chlorotoluron induced an additive inhibition of seed germination and plant growth. The inhibition of growth due to the DOM treatment was associated with the depression of activities of a-amylase, citrate synthase and NADP-isocitrate dehydrogenase, as well as the increase in malondlaldehyde content and electrolyte leakage. These results suggested that the presence of DOM might enhance the uptake and accumulation of chlorotoluron, and thus resulted in greater toxicity in wheat plants. The two forms of DOM exhibited differences in regulation of chlorotoluron toxicity to the wheat plants. Treatments with DOM-NTS induced greater toxicity to plants as compared to those with DOM-

关键词： dissolved organic matter chlorotoluron Triticum aestivum toxicity

Physics-constrained neural network for solving discontinuous interface K-eigenvalue problem with application to reactor physics

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Nuclear Science and Techniques 2023年第10期34卷 178-200页

作者： Qi-hong yang Yu yang yang-Tao Deng Qiao-Lin He He-Lin Gong Shi-Quan Zhang School of Mathdematics Sichuan UniversityChengdu 610065China Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

Machine learning-based modeling of reactor physics problems has attracted increasing interest in recent *** some progress in one-dimensional problems,there is still a paucity of benchmark studies that are easy to solve using traditional numerical methods albeit still challenging using neural networks for a wide range of practical *** present two networks,namely the Generalized Inverse Power Method Neural Network(GIPMNN)and Physics-Constrained GIPMNN(PC-GIPIMNN)to solve K-eigenvalue problems in neutron diffusion *** follows the main idea of the inverse power method and determines the lowest eigenvalue using an iterative *** PC-GIPMNN additionally enforces conservative interface conditions for the neutron ***,Deep Ritz Method(DRM)directly solves the smallest eigenvalue by minimizing the eigenvalue in Rayleigh quotient form.A comprehensive study was conducted using GIPMNN,PC-GIPMNN,and DRM to solve problems of complex spatial geometry with variant material domains from the fleld of nuclear reactor *** methods were compared with the standard flnite element *** applicability and accuracy of the methods are reported and indicate that PC-GIPMNN outperforms GIPMNN and DRM.

关键词： Neural network Reactor physics Neutron diffusion equation Eigenvalue problem Inverse power method

Probe gain via four-wave mixing based on spontaneously generated coherence

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Chinese Physics B 2017年第2期26卷 223-228页

作者： hong yang Ting-gui Zhang Yan Zhang College of Physics and Electronic Engineering Hainan Normal University Haikou 571158 China School of Mathematics and Statistics Hainan Normal University Haikou 571158 China School of Physics Northeast Normal University Changchun 130024 China

We have studied the probe gain via a double-Λ atomic system with a pair of closely lying lower levels in the presence of two probe and two coherent pump fields. The inversionless gain can be realized by using nondegenerate four-wave mixing under the condition of spontaneously generated coherence（SGC） owing to near-degenerate lower levels. Note that by using SGC, two probe fields can be amplified with more remarkable amplitudes, and the gain spectra of an extremely narrow linewidth can be obtained. Last but not least, our results show that the probe gain is quite sensitive to relative phases due to the SGC presence which allows one to modulate the gain spectra periodically by phase modulation, and can also be influenced by all laser field intensities and frequencies, and the angles between dipole elements.

关键词： probe gain four-wave mixing spontaneously generated coherence narrow spectra linewidth

Hankel Operators on Bergman Spaces of Annulus Induced by Regular Weights

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Acta Mathematica Sinica,English Series 2021年第5期37卷 775-804页

作者： Li hong yang Xiao Feng WANG Jin XIA School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006P.R.China

This paper is devoted to studying Bergman spaces A_(ω_(1,2))^(p)(M)(1 详细信息

This paper is devoted to studying Bergman spaces A_(ω_(1,2))^(p)(M)(1

关键词： Hankel operators regular-weight annulus Bergman spaces

Reversible light-driven magnetic switching of salen cobalt complex

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Science China Chemistry 2020年第9期63卷 1191-1197页

作者： Song Wan Mengqi Li Zhipeng Zhang Hancheng Xi hong yang Qianfu Luo Wei-hong Zhu Shanghai Key Laboratory of Functional Materials Chemistry Key Laboratory for Advanced Materials and Institute of Fine ChemicalsJoint International Research Laboratory of Precision Chemistry and Molecular EngineeringFeringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China

Spin-crossover(SCO)metal complexes are expected to be widely used in data storage materials,display devices and *** a lot of spin-crossover photoswitches have been developed,the reversible photomodulation cases that work at room temperature are ***,a novel cobalt complex o-1-Co(II)wherein the salen unit bridges with bis-diarylethene has been designed as switch to construct"off-on"logic operation at room *** complex o-1-Co(II)displays an abrupt,reversible and hysteretic spin crossover(T1/2↓=166 K,T1/2↑=177 K,andΔT1/2=11 K)between the high-spin(HS)and low-spin(LS)***,photocyclization of o-1-Co(II)with UV light produces a photoresponsive closed form c-1-Co(II),which always stays at low-spin without SCO at ***,the magnetic switching of the complex can also be achieved with redox reactions between Co(II)and Co(III).

关键词： photochromism diarylethene salen complex spin-crossover magnetic switch

Directional Edge Boxes： Exploiting Inner Normal Direction Cues forEffective Obiect Prooosal Generation

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Journal of Computer Science & Technology 2017年第4期32卷 701-713页

作者： Xiang Bai Zheng Zhang hong-yang Wang Wei Shen School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan ~3007~ China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200444 China

Edges are important cues for localizing object proposals. The recent progresses to this problem are mostly driven by defining effective objectness measures based on edge cues. In this paper, we develop a new representation named directional edges on which each edge pixel is assigned with a direction toward object center, through learning a direction prediction model with convolutional neural networks in a holistic manner. Based on directional edges, two new objectness measures are designed for ranking object proposals. Experiments show that the proposed method achieves 97.1% object recall at an overlap threshold of 0.5 and 81.9% object recall at an overlap threshold of 0.7 at 1 000 proposals on the PASCAL VOC 2007 test dataset, which is superior to the state-of-the-art methods.

关键词： object proposal directional edge convolutional neural network

Two-stage power system restoration model

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Global Energy Interconnection 2024年第6期7卷 773-785页

作者： hong yang Zhen Tang Wei Wang Zhihang Xue State Grid Shanxi Electric Power Research Institute Taiyuan 030001P.R.China School of Electric Engineering Xi’an Jiaotong UniversityXi’an 710049P.R.China

In response to the need for robust black-start strategies in modern smart grids during blackouts,this paper proposes a two-stage black-start model that integrates wind turbines(WT),photovoltaic generators(PV),and energy storage systems(ESS).The system restoration path model in the first stage utilizes the Dijkstra algorithm to create a skeleton network and formulate a post-outage generator start-up *** second stage involved a load pick-up model,structured as a mixed-integer linear programming problem,aimed at restoring the load with the assistance of the *** stage was designed for computational efficiency,allowing solutions to be obtained using standard commercial *** performance and efficacy of the proposed model were demonstrated through its application to modified IEEE 39/118-bus transmission systems,with the results affirming its high efficiency and effectiveness in power system restoration scenarios.

关键词： Black start Energy storage Renewable energy sources

Synthesis and electrocatalytic property of cubic and spherical nanoparticles of cobalt platinum alloys

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Frontiers of Chemical Science and Engineering 2010年第1期4卷 45-51页

作者： Xiaowei TENG hong yang Department of Chemical Engineering University of RochesterGavett Hall 206RochesterNY 14627USA

This paper describes the morphological control and electrocatalytic property of CoPt *** cubic and spherical CoPt nanoparticles were made using cobalt carbonyl and platinum 2,4-pentanedionate under different reaction temperatures in the presence of capping reagents,which included adamantanecarboxylic acid and *** of heterogeneous species on shape of the CoPt nanoparticles were examined by replacing cobalt carbonyl with silver *** results suggest that the formation of different shapes of CoPt particles could be attributed to the affinity between cobalt and platinum,and the effects of capping *** size and shape dependent electrocatalytic properties of these nanoparticles were examined based on the direct methanol oxidation reaction.

关键词： platinum Pt(acac)2 cobalt carbonyl nanocube sphere nanoparticle electrocatalyst shape control

Constructing core@shell structured photothermal nanosphere with thin carbon layer confined Co-Mn bimetals for pollutant degradation and solar interfacial water evaporation

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Rare Metals 2024年第4期43卷 1686-1701页

作者： hong-yang Zhu Meng-Ting Liu Gang Wang Rong-Rong Du hong-Yao Zhao Hao Lu Shi-Qi yang Sheng Tang Zeng-Jing Guo Jun yang Cheng-Zhang Zhu Fu yang School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003China School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng252000China School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China

Photothermal material applied in environmental governance has attracted growing *** combining the Stober method and dopamine-triggered coating strategy,Co-Mn precursor was in situ incorporated into the poly dopamine(PDA)layer over the surface of silica ***,a unique photothermal nanosphere with SiO_(2)core and thin carbon layer and dual Co-Mn oxides shell was allowed to form by sequential heat treatment in the inert atmosphere(SiO_(2)@CoMn/C).The bimetallic fraction of Co/Mn in the carbon layer and post-treatment calcination temperature was comprehensively tuned to optimize the peroxymonosulfate(PMS)activation performance of the *** state of bimetallic species was studied including their physical distribution,chemical valence,and interplay by various ***,Co oxides appear as dominant monodispersed nanoparticles(~10 nm),while Mn with cluster-like morphology is observed to uniformly distribute over thin-layer carbon and adhered to the surface of SiO_(2)nanospheres(~250 nm).The calcined temperature could tune the oxidized state of Co species,leading to the optimization of the catalytic performance of introduced dual metal *** a result,this obtained optimal catalyst integrated the advantages of exposed bimetallic CoMn species and N-doped thin carbon to deliver excellent catalytic PMS activation performance and photothermal synergetic catalytic mineralization ability for diversiform *** reactions condition controls and anion interference studies were conducted to identify the adaptability of the optimal ***,the application of solar-driven interfacial water evaporation using optimal SiO_(2)@Co_3Mn_1/C-600 catalyst was explored,showing a high water evaporation rate of 1.48 kg·m^(-2)·h^(-1)and an efficiency of 95.2%,further revealing a comprehensive governance functionality of obtained material in the complex pollution condition.

关键词： Photothermal Peroxymonosulfate(PMS)activation Bimetallic synergy Water evaporation Advanced oxidation process