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Ligand-mediated contaminant degradation by bare and carboxymethyl cellulose-coated bimetallic palladium-zero valent iron nanoparticles in high salinity environments

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Journal of Environmental Sciences 2019年第3期31卷 303-311页

作者： Xiaoming Ma Di He Adele M.Jones t.david waite taicheng An Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and Engineering Guangzhou University of Technology School of Civil and Environmental Engineering University of New South Wales

the application of nanoscale zero-valent iron(nZVI) for the degradation of contaminants has been extensively investigated, however, few studies have focused on degradation in high salinity environments. In this study, the ability of bare and carboxymethyl cellulose(CMC)-coated bimetallic Pd-nZVI particles to degrade 33′44′-tetrachlorobiphenyl in high saline water(SW) is examined with particular attention given to the effects of ethylenediaminetetraacetic acid(EDtA) on the rate of degradation. EDtA enhances the reactivity of Pd-nZVI in SW, with evidence provided to link this to the removal of the passivating layer. Additionally, a conceptual model is proposed which provides a quantitative description of the removal of these iron oxide layers in the presence of EDtA. An optimum EDtA to bare Pd-nZVI molar ratio of 0.1 exists, with insufficient EDtA unable to remove the passivating layer whilst excess EDtA results in Fe loss and enhanced agglomeration due to magnetic attraction of the bare Fe(0) particles. In contrast, CMCcoating of Pd-nZVI assemblages actually impedes degradation, despite the coated particles displaying a smaller average size compared to uncoated particles, with even the presence of EDtA in this case not significantly improving degradation. the reduced reactivity in the presence of CMC is primarily attributed to the effect of CMC on the association of Pd with nZVI particles. In particular, the presence of CMC reduced the total amount of Pd incorporated with the stabilized particles compared to the non-stabilized ***, the presence of CMC results in less Pd present in its reactive zero-valent oxidation state.

关键词： Bimetallic zero valent iron ligand-mediated depassivation polychlorinated biphenyls high salinity water

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组合膜工艺中膜污染控制原理与技术

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中国科技成果 2013年第9期14卷 30-31页

作者：文湘华 t.david waite 清华大学环境学院澳大利亚新南威尔士大学环境工程与土木学院

水资源短缺是我国在21世纪所面临的严峻挑战。作为非常规水源，城市污水处理厂二级处理出水具有水量大且稳定等优点，埘其进行深度处理，将其制备为再生水，可回用于各种用水目标，对于缓解水资源紧张形势具有重要的意义。在这一背景下... 详细信息

水资源短缺是我国在21世纪所面临的严峻挑战。作为非常规水源，城市污水处理厂二级处理出水具有水量大且稳定等优点，埘其进行深度处理，将其制备为再生水，可回用于各种用水目标，对于缓解水资源紧张形势具有重要的意义。在这一背景下，膜法水处理技术以其突出的优点，在国内外均引起了普遍关注。膜工艺是一种安全且性价比较高的污水再生回用处理工艺。成功应用膜工艺的关键是有效控制膜污染。由于水质条件复杂及研究手段的限制，目前学术界对膜污染微观过程与机理的认识尚不十分清楚。新型污染物是目前受到普遍关注的污染物，结合臭氧处理单元的组合膜系统在新型污染物去除，保证再生水安全方面是非常具有前景的技术。

关键词：膜法水处理技术控制原理膜工艺膜污染水资源短缺污染物去除城市污水处理厂二级处理出水

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纳米银介导活性氧自由基产生与生物协同毒性研究

纳米银介导活性氧自由基产生与生物协同毒性研究

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第二届全国环境纳米技术及生物效应学术研讨会

作者：何頔 t.david waite 广东工业大学环境健康与污染控制研究院澳大利亚新南威尔士大学土木与环境工程学院

纳米银(Ag-NPs)以其广谱杀菌性,对水环境的生物圈存在潜在毒性影响。近期研究表明,当Ag-NPs与海洋卡盾藻(赤潮发生的主要"元凶")共存时,对鱼鳃细胞具有协同毒性,并提出Ag-NPs协同毒性的诱发机理:Ag-NPs的存在可破坏卡盾藻活性氧自由基(R... 详细信息

纳米银(Ag-NPs)以其广谱杀菌性,对水环境的生物圈存在潜在毒性影响。近期研究表明,当Ag-NPs与海洋卡盾藻(赤潮发生的主要"元凶")共存时,对鱼鳃细胞具有协同毒性,并提出Ag-NPs协同毒性的诱发机理:Ag-NPs的存在可破坏卡盾藻活性氧自由基(ROS)代谢,致使卡盾藻释放过量ROS,增加鱼鳃细胞致死率;同时卡盾藻释放的胞外ROS(例如H2O2)可加快Ag-NPs的溶解,诱发Ag(Ⅰ)离子的进一步释放,产生协同生物毒性效应。通过建立Ag-NPs在不同盐浓度下聚集溶解动力学模型,系统性地评估Ag-NPs在天然水体(淡水、苦咸水、海水)中聚集、分形维数变化对Ag(Ⅰ)离子溶解释放过程的影响。为进一步阐释Ag-NPs与ROS之间相互作用,提出电子充放电理论,即当AgO-NPs与HO共存时,可诱发超氧自由基{O),通过O对AgONPs充电,致使电子在AgO-NPs表面存储,当环境体系存在电子接收体(例如O、Ag),电子由AgO向O、Ag+等转移,实现O与纳米AgONPs再生(图1)。

关键词：纳米环境过程纳米生物效应纳米颗粒聚集与溶解活性氧自由基

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纳米银的聚集、溶解与活性氧自由基产生

纳米银的聚集、溶解与活性氧自由基产生

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第一届全国环境化学青年学者论坛

作者：何頔 t.david waite 广东工业大学环境健康与污染控制研究院澳大利亚新南威尔士大学土木与环境工程学院

＜正＞Ag-NPs作为最常见的ENPs,鉴于其广谱杀菌性,已广泛应用于医药、纺织、环保等领域,Ag-NPs排放进入水环境中势必对水生物圈产生毒性效应。近期研究表明,当Ag-NPs与海洋卡盾藻（赤潮发生的主要"元凶"）共存时,对鱼鳃细胞具有协同毒性... 详细信息

＜正＞Ag-NPs作为最常见的ENPs,鉴于其广谱杀菌性,已广泛应用于医药、纺织、环保等领域,Ag-NPs排放进入水环境中势必对水生物圈产生毒性效应。近期研究表明,当Ag-NPs与海洋卡盾藻（赤潮发生的主要"元凶"）共存时,对鱼鳃细胞具有协同毒性,Ag-NPs协同毒性的诱发机理:Ag-NPs的存在可破坏卡盾藻活性氧自由基（ROS）代谢,

关键词：海洋污染纳米银生物毒性协同效应致毒机制

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Late Ordovician Mass Extinction: Earth, fire and ice

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National Science Review 2024年第1期11卷 51-65页

作者： david A.t.Harper Palaeoecosystems Group Department of Earth SciencesDurham University

the Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. two phases have been identified near the start of the Hirnantian period and in the middle. It was a massive taxonomic extinction, a weak phylogenetic extinction and a relatively benign ecological extinction. A rapid cooling, triggering a major ice age that reduced the temperature of surface waters, prompted a drop in sea level of some 100 m and introduced toxic bottom waters onto the shelves. these symptoms of more fundamental planetary processes have been associated with a range of factors with an underlying driver identified as volcanicity. Volcanic eruptions, and other products, may have extended back in time to at least the Sandbian and early Katian, suggesting the extinctions were more protracted and influential than hitherto documented.

关键词： Ordovician LOME paleoecology palaeobiogeography biotas

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Instance Segmentation of Characters Recognized in Palmyrene Aramaic Inscriptions

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2869-2889页

作者： Adéla Hamplová Alexey Lyavdansky tomášNovák Ondrej Svojše david Franc Arnošt Veselý Czech University of Life Sciences in Prague(CULS) Faculty of Economics and ManagementDepartment of Information EngineeringPrague16500Czech Republic National Research University Higher School of Economics(HSE) Faculty of HumanitiesInstitute for Oriental and Classical StudiesMoscow101000The Russian Federation

this study presents a single-class and multi-class instance segmentation approach applied to ancient Palmyrene inscriptions,employing two state-of-the-art deep learning algorithms,namely YOLOv8 and Roboflow *** goal is to contribute to the preservation and understanding of historical texts,showcasing the potential of modern deep learning methods in archaeological *** research culminates in several key findings and scientific *** comprehensively compare the performance of YOLOv8 and Roboflow 3.0 in the context of Palmyrene character segmentation—this comparative analysis mainly focuses on the strengths and weaknesses of each algorithm in this *** also created and annotated an extensive dataset of Palmyrene inscriptions,a crucial resource for further research in the *** dataset serves for training and evaluating the segmentation *** employ comparative evaluation metrics to quantitatively assess the segmentation results,ensuring the reliability and reproducibility of our findings and we present custom visualization tools for predicted segmentation *** study advances the state of the art in semi-automatic reading of Palmyrene inscriptions and establishes a benchmark for future *** availability of the Palmyrene dataset and the insights into algorithm performance contribute to the broader understanding of historical text analysis.

关键词： Optical character recognition instance segmentation Palmyrene ancient languages computer vision

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Super-hydrophobic stearic acid layer formed on anodized high purified magnesium for improving corrosion resistance of bioabsorbable implants

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Journal of Magnesium and Alloys 2018年第4期6卷 327-336页

作者： Sohrab Khalifeh t.david Burleigh Materials&Metallurgical Engineering Department New Mexico Institute of Mining&TechnologySocorroNM 87123USA

Magnesium and its alloys are ideal candidates for bioabsorbable ***,they can dissolve too rapidly in the human body for most *** this research,high purified magnesium(HP-Mg)was coated with stearic acid(SA)to slow the corrosion rate of magnesium in simulated body fluid at 37±1°***-Mg was anodized(AC and DC voltages)to form an oxide/hydroxide layer,and then it was immersed in a SA *** SA coated layer surface,anodized layer,and the thickness of the oxide/hydroxide layer were investigated with Scanning Electron Microscopy(SEM).Electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization(PDP)were used to estimate the corrosion rate of HP-Mg *** results confirm that the hydrophobic coating can decrease the corrosion rate of HP-Mg by more than *** protectiveness of coated layer for anodized specimens with AC voltage continue for 2 and 3 *** the HP-Mg coated anodized with DC voltage,the coated layer could improve the corrosion resistance for only a few days.

关键词： Magnesium Biomaterials Hydrophobic layer Stearic acid Simulated body fluid Electrochemical impedance spectroscopy

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Energy exchange between charged relativistic fluids in f(t) gravity

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Communications in theoretical Physics 2024年第10期76卷 108-120页

作者： Z Yousaf U A Khokhar Nasser Bin turki t Suzuki Department of Mathematics University of the Punjab Quaid-i-Azam Campus Department of Mathematics College of Science King Saud University Department of Regional Management Faculty of Management Fukushima College

this study focuses on the effects of a polytropic fluid on a charged gravitational source within f(t) gravity, where t is the torsion scalar. We investigate how the electromagnetic field affects the flow of energy in spherically symmetric and static celestial objects that contain relativistic fluids. By using the gravitational decoupling technique, we analyze the effects of polytropic fluid on the dynamics of the gravitational source, accompanied by the matching of the interior geometry with an exterior at the hypersurface Σ. Finally, with the help of the tolman ⅡV solution, we observe the conduct of energy conditions with the existence of charge using f(t)field equations and got the intended outcomes.

关键词： anisotropy complexity energy exchange hydrodynamics self-gravitating systems

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Weeks-Ahead Epidemiological Predictions of Varicella Cases From Univariate time Series Data Applying Artificial Intelligence

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Infectious Diseases & Immunity 2024年第1期4卷 25-34页

作者： david A.Wood DWA Energy Limited Lincoln LN59JPUnited Kingdom

Background:"Chickenpox"is a highly infectious disease caused by the varicella-zoster virus,influenced by seasonal and spatial *** with varicella-zoster epidemics can be a substantial drain on health-authority *** that improve the ability to locally predict case numbers from time-series data sets every week are therefore worth ***:Simple-to-extract trend attributes from published univariate weekly case-number univariate data sets were used to generate multivariate data for Hungary covering 10 *** attribute-enhanced data set was assessed by machine learning(ML)and deep learning(DL)models to generate weekly case forecasts from next week(t0)to 12 weeks forward(t+12).the ML and DL predictions were compared with those generated by multilinear regression and univariate prediction ***:Support vector regression generates the best predictions for weeks t0 and t+1,whereas extreme gradient boosting generates the best predictions for weeks t+3 to t+***-short-term memory only provides comparable prediction accuracy to the ML models for week t+***-K-fold cross validation reveals that overall the lowest prediction uncertainty is associated with the tree-ensemble ML ***:the novel trend-attribute method offers the potential to reduce prediction errors and improve transparency for chickenpox timeseries.

关键词： Varicella zoster virus infection Disease-case weekly predictions Weeks-ahead forecasting Univariate time-series enhancements tree-ensemble machine learning time-series attribute extraction

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Blast waveform tailoring using controlled venting in blast simulators and shock tubes

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Defence technology（防务技术） 2024年第7期37卷 14-26页

作者： Edward Chern Jinn Gan Alex Remennikov david Ritzel Faculty of Engineering and Information Sciences University of WollongongWollongongNSW2522Australia Dyn-FX Consulting Ltd 19 Laird Ave NorthAmherstburgONN9V 2T5Canada

A critical challenge of any blast simulation facility is in producing the widest possible pressure-impulse range for matching against equivalent high-explosive *** tubes and blast simulators are often constrained with the lack of effective ways to control blast wave profiles and as a result have a limited performance *** wave shaping techniques employed in some facilities are reviewed but often necessitate extensive geometric modifications,inadvertently cause flow anomalies,and/or are only applicable under very specific *** paper investigates controlled venting as an expedient way for waveforms to be tuned without requiring extensive modifications to the driver or existing geometry and could be widely applied by existing and future blast simulation and shock tube *** use of controlled venting is demonstrated experimentally using the Advanced Blast Simulator(shock tube)at the Australian National Facility of Physical Blast Simulation and via numerical flow simulations with Computational Fluid *** venting is determined as an effective method for mitigating the impact of re-reflected waves within the blast *** control method also allows for the adjustment of parameters such as tuning the peak overpressure,the positive phase duration,and modifying the magnitude of the negative phase and the secondary shock of the blast *** paper is concluded with an illustration of the potential expanded performance range of the Australian blast simulation facility when controlled venting for blast waveform tailoring as presented in this paper is applied.

关键词： Advanced blast simulator Shock wave propagation Far-field explosion Blast loads Blast waves Computational fluid dynamics

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