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SSRN 2022年

作者： He, Jinlong McCutcheon, Jeffrey R. Li, Ying Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Department of Chemical & Biomolecular Engineering Center for Environmental Sciences and Engineering University of Connecticut StorrsCT06269 United States Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States

The industry-leading polyamide (PA) reverse osmosis (RO) membranes can be manufactured via molecular layer-by-layer (mLBL) deposition, interfacial polymerization (IP), and 3D-printing technique. However, the influence of different manufacturing methods on PA membrane’s properties is far from understood. In this study, we present the high-pressure transport behavior of water and salt ions for PA membranes formed with IP, mLBL, and 3D-printing through non-equilibrium molecular dynamics simulations. Studies show that membranes fabricated with 3D-printing have similar performances to those manufactured using mLBL, quantified by water permeability, rejection of salt ions, structural integrity, and porosity features. However, the membranes formed with IP exhibit faster water transport, lower rejection, worse structural integrity, and more inhomogeneous network pores than those constructed using mLBL and 3D-printing. The unconnected water-accessible space governs water transport for PA membranes formed with mLBL and 3D-printing, which offers the impermanent open-closed pores that enable water to jump through PA membranes. In contrast, the permeated water-enterable space plays a prominent role in water movement across the PA membrane formed with IP, providing a continuous transport channel at high pressure. Importantly, we observe the more significant compaction features at high pressure for PA membranes formed with IP than mLBL and 3D-printing. © 2022, The Authors. All rights reserved.

关键词： Polymerization

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Prediction and analysis of atmospheric visibility in five terrain types with artificial intelligence

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Heliyon 2023年第8期9卷 e19281页

作者： Liang, Chen-Wei Chang, Chia-Chun Hsiao, Chun-Yun Liang, Chen-Jui Department of Biomechatronic Engineering National Ilan University Yilan Taiwan Master Program in UAV Application and Smart Agriculture National Ilan University Yilan Taiwan Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan International School of Technology and Management Feng Chia University Taichung Taiwan Artificial Intelligence Technology and Application Bachelor Program Feng Chia University Taichung Taiwan

Scattering visiometers are widely used to measure atmospheric visibility;however, visibility is difficult to measure accurately because the extinction coefficient decays exponentially with visual range according to the Koschmid's law. Moreover, models for predicting visibility are lacking due to the lack of accurate visibility observations to verify. This study formulated an artificial intelligence method for measuring atmospheric visibility in five topographical regions: hills, basins, plains, alluvial plains, and rift valleys. Four air pollution factors and five meteorological factors were selected as independent variables for predicting visibility by using three artificial intelligence models, namely a support vector machine (SVM) model, a multilayer perceptron (MLP) model, and an extreme gradient boosting (XGBoost) model. The GridSearchCV function was used to automatically tune model hyperparameters to determine the optimal parameter values of the three models for the five target areas. The predictions of the aforementioned three models underwent considerable considerably scale shrinking relative to observed values. The inappropriately low predicted visibility values might have been caused by the use of inaccurate observations for training. To solve this problem, formulas of scale ratio and downshift were used to adjust the predicted values. Statistical measurements of model performance measures by five quantitative methods (e.g., correlation coefficient, mean absolute error) showed that adjusted predictions were in strong agreement with the observation data for the five target areas. Therefore, the adjusted prediction has high reliability. Because of obvious differences in the topography, weather, and air quality of the five target areas, different models provided optimal predictions for different areas. In densely populated western Taiwan, the MLP model is most suitable for predicting visibility on hills whereas the XGBoost model is most suitable for predictin

关键词： Air pollutants Extinction coefficient Fog-haze Koschmieder's law Machine learning Terrain effects

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Correction: Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)

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Dalton transactions (Cambridge, England : 2003) 2022年第1期52卷 2022 Dec 8页

作者： Shouwei Zhang Meiyi Zeng Wenqing Xu Jiaxing Li Jie Li Jinzhang Xu Xiangke Wang Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma Physics Chinese Academy of Sciences 230031 Hefei PR China. lijx@***. School of Materials Science and Engineering Hefei University of Technology Hefei 230031 China. Department of Chemical Engineering Environmental Engineering Program Yale University New Haven Connecticut 06520 USA.

Correction for 'Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)' by Shouwei Zhang , , 2013, , 7854-7858, https://***/10.1039/C3DT50149C.

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Rare earth elements in sands collected from Southern California sea beaches

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Chemosphere 2023年 344卷 140254页

作者： Saha, Biraj Eliason, Kira Golui, Debasis Masud, Jahangir Bezbaruah, Achintya N. Iskander, Syeed Md Department of Civil Construction and Environmental Engineering North Dakota State University FargoND58102 United States Department of Soil Science and Agricultural Chemistry ICAR-Indian Agricultural Research Institute Pusa Campus New Delhi110 012 India Energy and Environmental Research Center University of North Dakota Grand ForksND58202 United States Materials and Nanotechnology Program North Dakota State University FargoND58108 United States Environmental and Conservation Sciences North Dakota State University FargoND58108 United States

Rare earth elements (REEs) are considered the limiting resources for advancing clean technologies and electronics. Because global REEs reserve is limited, non-conventional and secondary sources are being investigated for recovery. Here, we investigated wet and dry sand from seven Southern California beaches for sixteen REEs. These include five light REEs, two medium REEs, and nine heavy REEs, separated by their atomic weight. The mass of the magnetically separated compounds ranged from 15.19 to 129.91 g per kg of dry sand in the studied sea beaches in Southern California. The total REEs concentration ranged from 1168.1 to 6816.7 μg per kg of wet sand (dry sand basis) and 1474.7–7483.8 μg per kg of dry sand. Cerium (Ce) and Yttrium (Y) were the most prevalent REEs in these beaches ranging from 387.4 to 2241.1 μg kg−1 and 104.5–2302.3 μg kg−1 of sand respectively. This study found light REEs concentration accounted for 70–80% of total rare earth elements in the studied beaches. The concentrations of the analyzed REEs were significantly different (p © 2023 Elsevier Ltd

关键词： Rare earth elements

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Energy-saving potential of GCC addition in linerboard manufacturing

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第2期51卷 68-75页

作者： Han, Jun Kyou Lee, Yong-Kyu Won, Jong Myoung Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of

The feasibility of energy consumption reduction in the linerboard manufacturing process while maintaining the major properties of the product by increasing its ash content was investigated. For this purpose, ground calcium carbonate (GCC 75F) and GCC composite with microfibrillated cellulose (MFC) were chosen as inorganic fillers. The solid content was measured after wet pressing and drying to evaluate the effect of their addition and the change in the physical properties of linerboard with the ash content was also studied. As the ash content increased, the solid content also increased after wet pressing, with no significant difference between using GCC and GCC composite;however, after drying, the solid content was significantly increased at the initial drying stage by the ash content increase, and a solid content obtained was somewhat higher when the GCC composite was added. The bulk of linerboard was slightly reduced as the ash content increased, but there was no significant difference between GCC and GCC composite. The air resistance decreased slightly when the ash content was increased by the addition of GCC. However, when using GCC composites as fillers, the air resistance was increased slightly. The strain change was not significant even though the ash content was increased by 10% and there was no significant difference between GCC and GCC composite. However, the tensile index, the tensile energy absorption, the tear index, the burst index, and the Taber stiffness decreased with increasing the ash content and the strength obtained by using the GCC composite was higher than that by GCC. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Physical properties

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Reconciling regional nitrogen boundaries with global food security (Sep, 10.1038/s43016-021-00366-x, 2021)

NATURE FOOD

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NATURE FOOD 2022年第5期3卷 385-385页

作者： Chang, Jinfeng Havlik, Petr Leclere, David de Vries, Wim Valin, Hugo Deppermann, Andre Hasegawa, Tomoko Obersteiner, Michael College of Environmental and Resource Sciences Zhejiang University Hangzhou China Ecosystems Services and Management Program (ESM) International Institute for Applied Systems Analysis (IIASA) Laxenburg Austria Environmental Systems Analysis Group Wageningen University and Research Wageningen the Netherlands College of Science and Engineering Ritsumeikan University Shiga Japan

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Ship Propeller Rotation Threshold to Prevent Erosion and Sedimentation in Coastal Waters

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哈尔滨工程大学学报(英文版) 2024年第4期23卷 798-811页

作者： Abdul Kadir I.Istadi Agus Subagio I.Iskendar W.Waluyo Abdul Muis Dewi Kartikasari Siti Sadiah A.B Widagdo M.P Helios Mochammad Nasir N.Nurhadi Doctoral Program of Environmental Science School of Postgraduate StudiesUniversitas DiponegoroSemarangCentral Java 50275Indonesia Research Center for Transportation Technology National Research and Innovation Agency(BRIN)Jakarta 10340Indonesia Department of Chemical Engineering Faculty of EngineeringUniversitas DiponegoroSemarangCentral Java 50275Indonesia Department of Physics Faculty of Science and MathematicsUniversitas DiponegoroSemarangCentral Java 50275Indonesia Research Center for Hydrodynamic Technology National Research and Innovation Agency(BRIN)Jakarta 10340Indonesia Research Center for Energy Conversion and Conservation National Research and Innovation Agency(BRIN)Jakarta 10340Indonesia Directorate of Laboratory Management Research Facilitiesand Science and Technology ParkNational Research and Innovation Agency(BRIN)Jakarta 10340Indonesia

The rotation of a ship’s propeller can accelerate the water flow around it,which puts pressure on seabed *** pressure on the seabed can significantly trigger erosion and sedimentation of coastal *** the impact that can be caused,the ship’s propeller rotation limit needs to be determined to avoid damage to the aquatic *** research determines the threshold of ship propeller rotation based on the water flow velocity *** has been carried out at the Hydrodynamics Laboratory on several variations of propeller rotation R_(rmp)(r/min)and water depth using empirical approaches,numerical simulations,and scale model *** based on general standard criteria for erosion and sedimentation shows that a propeller with a diameter(D_(p))of 1.5 m is safe for propeller rotation at 25 r/min at all water ***,the propeller rotation of 75 r/min is safe for a distance between the propeller axis and the bottom of the water equal to D_(p).Meanwhile,rotation at 120 r/min is safe at a minimum distance of 1.5 D_(p),and 230 r/min is safe for a minimum distance of 2.0 D_(p).The propeller rotation threshold criteria are essential to determining the new under-keel clearance for environmentally friendly ship *** values vary based on seabed particle type and water depth.

关键词： Landing craft tank Water flow velocity Seabed erosion Under keel clearance

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Mo-terminated edges in two-dimensional molybdenum disulfide for site-specific hydrolysis and DNA cleavage

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Materials Today 2025年 86卷 162-171页

作者： Wang, Cong Wu, Menghan Li, Muqing Zhao, Yingcan Zhao, Mingchuang Zhang, Yunhao Bai, Yichao Gao, Jianxiang Wang, Xiaoxia Tian, Xilin Zhang, Han Chang, Liang Zou, Xiaolong Liu, Bilu Kang, Feiyu Terrones, Mauricio Lei, Yu Institute of Materials Research Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications Guangdong Provincial Key Laboratory of Thermal Management Engineering and Materials & Center of Double Helix Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Institute of Materials Research & Shenzhen Geim Graphene Center Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications Tsinghua-Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Environmental Science Program Department of Life Sciences Beijing Normal University-Hong Kong Baptist University United International College Guangdong519087 China Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Department of Physics Department of Chemistry Department of Materials Sciences Center for 2-Dimensional and Layered Materials The Pennsylvania State University University ParkPA16802 United States International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China

The hydrolysis of DNA serves as the foundational principle for gene engineering that enable precise gene cleavage at the molecular level. This process typically occurs in biological nucleases, which exhibit nucleobase-selective and catalytic hydrolysis capabilities rarely replicated in abiotic nanomaterials. Here, we demonstrate that molybdenum-terminated (Mo-terminated) edges of molybdenum disulfide (MoS2) possess the unique ability to abstract a proton (H+) from water molecules, thereby facilitating catalytic hydrolysis reactions that cleave the phosphodiester bonds in DNA through the action of hydroxide ions. The enhanced proton absorption at Mo-terminated edges of MoS2 significantly reduces the activation energy required for the DNA hydrolysis reaction. Furthermore, the favorable interaction between the Mo-terminated edges and thymine nucleobases promotes both charge transfer and P-O bond cleavage, enabling targeted DNA hydrolysis at 'TTTTTTT' sequences under dark conditions. This discovery underscores the potential of MoS2 as a stable, efficient nanosystem for precise genetic editing, heralding advanced applications in the field of gene engineering. © 2025 The Author(s)

关键词： Activation energy

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Effects of production variables of fines-PCC composite fillers on paper properties (II): Added amounts and type of fines

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第6期51卷 167-174页

作者： Kang, Hyun Won, Jong Myoung Cho, Byoung-Uk Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chunchon24341 Korea Republic of

A composite filler was developed by pre-flocculation of hardwood bleached kraft pulp (HwBKP) fines and precipitated calcium carbonate (PCC) with flocculants such as cationic polyacrylamide (C-PAM) and bentonite. Effects of addition ratios and type of fines during production of the composite fillers on the mechanical and the optical properties of handsheets were investigated. Increasing fines addition ratios improved strength properties of handsheets both in the composite fillers and in the conventional loading. The composite filler with softwood bleached kraft pulp (SwBKP) fines resulted in superior strength properties than that with HwBKP fines and with the mixture of HwBKP fines and SwBKP fines. The composite filler and the conventional loading showed similar levels of brightness and opacity at a given addition ratio of fines. In addition, distinct effects of type of fines on brightness and opacity of handsheets with the composite fillers were not found. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Flocculation

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Coal quality analysis at CV Bara Mitra Kencana Sawahlunto West Sumatera

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AIP Conference Proceedings 2024年第1期3001卷

作者： Heri Prabowo Eri Barlian Nurhasan Syah Deni Riski Ramadan Department of Environmental Science Program Universitas Negeri Padang Padang Indonesia Department of Mining Engineering Universitas Negeri Padang Padang Indonesia

One of the main parameters that determine the processing and utilization of coal mining is the quality of the coal. This research was conducted to determine the quality of coal based on proximate, sulfur, and calorie analysis with ASTM standards. Coal sampling was carried out at three different layers at CV. Bara Mitra Kencana. In suture sample 1 with the basic results dry air Total moisture 22.08%, Ash 62.25%, Moisture in 7.48%, Volatile matter 23.91%, Total sulfur 0.8%, Fixed carbon 6.36%, Calorific Value 2155.77 KCal / Kg. In suture sample 2 with the basic results dry air Total humidity 14.64%, Ash 6.29%, Humidity 6.48%, Volatile 37.45%, total sulfur 0.37%, fixed carbon 49.78%, Calorific value 7336 KCal / Kg. Inseam sample 3 with the basic results dry air Total humidity 9.71%, ash 2.84%, humidity 4.57%, volatile material 41.87%, total sulfur 0.32%, fixed carbon 50.72%, Calorific value 8207 KCal / Kg. It can be concluded that seam 1 samples include very low-quality coals and seam 2 and seam 3 samples include high-quality coals. low has a low calorific value. Meanwhile, the effect of carbon shows that the lower the carbon content of coal, the lower the heating value of coal.

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