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research and practice of key technologies for landslide dam development and utilization——A case in Hongshiyan landslide dam Water Conservancy Project

River

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river 2023年第3期2卷 251-262页

作者： Zongliang Zhang Xueming Wu Enshang Xiao Ning He Kai Cheng Ga Zhang Xingbo Zhou Chun Zhao Huanling Wang Hongming du Xiangang Jiang PowerChina Kunming Engineering Corporation Limited KunmingChina Sub-Center of High Earthfill/Rockfill Dam National Energy and Hydropower Engineering Technology R&D CenterKunmingChina Sinohydro Foundation Bureau Co. Ltd.TianjingChina Nanjing Water Conservancy Research Institute NanjingChina Tsinghua University BeijingChina Hydro-Power and Water Resources Planning and Design Institute BeijingChina China Institute of Water Resources and Hydropower Research BeijingChina Hohai University NanjingChina Sichuan Agricultural University Dujiangyan Campas DujiangyanChina

Based on the emergency rescue,the subsequent disposal,and the development and utilization projects of the Hongshiyan Landside dam in Ludian,Yunnan,China,research has been conducted on key technical issues facing the development and utilization of landside dams,including the possibilty evaluation of development and utilization,structure analysis of wide gradation material,performance evaluation,investigation and design,dam seepage control,construction technology and equipment,and safe operation *** innovative results has made in all seven aspects mentioned above,writing the history in *** achievements were directly applied to the development planning,investigation and design,construction,and operation and maintenance of the Hongshiyan Landside dam,a comprehensive water conservancy project that integratesflood control,water supply,irrigation,and power generation,with significant comprehensive benefits.

关键词： construction equipment development and utilization investigation and design landside dam performance evaluation safety assessment

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development of a Feasible and Scalable Manufacturing Method for Ptfe-Based Solvent-Free Lithium-Ion Battery Electrodes

SSRN

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SSrN 2024年

作者： Oh, Hyeseong Kim, Gyu-Sang Hwang, Byung Un Bang, Jiyoon Kim, Jinsoo Jeong, Kyeong-Min School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research Ulsan44776 Korea Republic of

Conventional wet-electrode manufacturing faces challenges with producing thicker electrodes due to solvent evaporation issues. This study introduces a novel method for the fabrication of solvent-free dry electrodes by employing polytetrafluoroethylene (PTFE) as a binder, marking a significant advancement in electrode manufacturing processes. By eliminating solvent use, this method not only addresses these challenges but also offers a scalable and practical solution for mass production. The process is meticulously structured into sequential unit operations, each tailored for a distinct function, harnessing the distinctive fibrillation properties of PTFE. Intermediate product specifications for each phase are clearly defined, with a comprehensive analysis of both physical and electrochemical performances conducted. This analysis emphasizes the influence of varying PTFE contents and properties on the microstructure of the dry electrode. Notably, the study achieves a breakthrough with an electrode formulation of NCM811/PTFE/carbon black (CB)/carbon nanotube (CNT) = 96/2.0/1.8/0.2, which demonstrates exceptional capacity retention of 80% at a 0.5 C-rate (5 mA/cm2) under the demanding parameters of 10 mAh/cm2 and 3.8 g/cc. This approach not only enhances the microstructural properties of dry electrodes but also paves the way for environmentally friendly and efficient electrode manufacturing for future energy storage applications. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Enhanced visible-light photocatalytic activity of Fe3O4@MoS2@Au nanocomposites for methylene blue degradation through Plasmon-Induced charge transfer

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Separation and Purification technology 2024年 342卷

作者： Kumar, Pradeep deng, Zu-Yin Tsai, Po-Yu Chiu, Chin-Ya Lin, Chin-Wei Chaudhary, Priyanka Huang, Yu-Ching Chen, Kuen-Lin Department of Physics National Chung Hsing University Taichung40227 Taiwan Institute of Nanoscience National Chung Hsing University Taichung40227 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Department of Materials Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Biochemical Technology R&D Center Ming Chi University of Technology New Taipei City243303 Taiwan Department of Chemical and Materials Engineering Chang Gung University Taoyuan33302 Taiwan

In this study, we synthesized Fe3O4@MoS2@Au nanoparticles as a photocatalyst for the degradation of methylene blue (MB). The presence of gold nanoparticles induced Localized Surface Plasmon resonance (LSPr), extending the absorption range into the visible light spectrum. Under green light exposure (540 nm, 8 W), the Fe3O4@MoS2@Au photocatalyst exhibited remarkable performance, achieving a degradation efficiency of 98.95%, outperforming Fe3O4@MoS2, which reached 72.46%. The pseudo-first-order reaction rate constant for Fe3O4@MoS2@Au was 3.8 × 10−3 min−1, surpassing Fe3O4@MoS2 by 2.7 times. Additionally, Fe3O4@MoS2@Au demonstrated superior degradation efficiency under natural light, reaching 78% after 3 h compared to 70.2% for Fe3O4@MoS2. To elucidate the degradation mechanism, density functional theory (dFT) based computational simulations were employed to analyze the electron charge density at each step of the degradation process. The density of state simulation revealed a shift in electron energy levels towards higher energies in Fe3O4@MoS2@Au compared to Fe3O4@MoS2, thereby promoting electron transfer and enhancing the efficiency of photodegradation. © 2024 Elsevier B.V.

关键词： Aromatic compounds

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The Improved Sparger Enhances Bioleaching of Arsenic-Bearing Gold Concentrate in a Stirred Tank

SSRN

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SSrN 2025年

作者： Lei, Zheng Jiayu, Xin Changliu, He Aijun, Zhang ranting, Tao Xu, Zhang Beijing Key Lab of Bioprocess National Energy R&D Center for Biorefinery College of Life Science and Technology Beijing University of Chemical Technology Beijing China College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing China Analysis and Test Center Beijing University of Chemical Technology Beijing China

Bioleaching is often used for low-grade ores, mixed-strain leaching can be affected by factors like temperature and substrates. This research compared the coorperative leaching effects of mesophilic and thermophilic strains, including Leptospirillum ferrooxidans(L.f), Acidithiobacillus caldus(A.c), and Sulfobacillus thermosulfidooxidans(S.t). An efficient strain combination of (L.f+A.c): S.t = 1:1 was determined and large-scale fermenter experiments were conducted to optimize parameters. Subsequently, the original sparger was replaced with a nano-aeration pipe(NAP) to investigate its impact on dissolved oxygen and leaching effect. The arsenic leaching rates of different spargers were compared. The results showed that NAP significantly increased the OUr and kLa of the microorganisms in the reaction system. From the experimental results, the leaching efficiency was increased by 3.61% and the daily energy consumption was reduced by 1.59%. Comparing the dissolved oxygen levels, it was found that the dissolved oxygen content of NAP remained stable, while that of the original sparger showed a significant decrease in the early stage. On the 8th day of leaching, the dissolved oxygen level of the improved sparger was 2.87% higher than that of the original sparger. Scanning electron microscopy also confirmed that NAP enhanced microbial leaching. This study not only improves leaching efficiency and demonstrates certain economic value but also provides a new perspective for the optimization of stirred-tank technology in bioleaching. © 2025, The Authors. All rights reserved.

关键词： Gold deposits

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Lamellar structured GO-Melamine nanocomposite membranes with varying d-spacing for efficient organic solvent nanofiltration (OSN)

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Journal of Membrane Science 2024年 699卷

作者： Abebe, Shalligito Habetamu TM, Subrahmanya Faye M Austria, Hannah Nayak, Smrutiranjan Setiawan, Owen Huang, Tsung-Han Hung, Wei-Song Hu, Chien-Chieh Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan R&D Center for Membrane Technology Chung Yuan University Chung-Li32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32023 Taiwan

There is a lot of research being done on GO lamellar 2d membranes for separating organic solvents and dyes. These membranes are highly sought-after due to their exceptional characteristics. However, existing challenges include inadequate solvent permeability and limited dye rejection capacity due to swelling of membranes. In this study, we proposed a novel technique that employs low-pressure assisted filtration to fabricate nanocomposite membranes using GO and melamine. remarkably, these composite membranes exhibited outstanding separation performance for dyes (≥99.06 %) in organic solvents, regardless of their positive or negative charges or when present in mixtures. The optimum GO-M0.02 nanocomposite membrane exhibits impressive organic solvent flux (J), attaining a value as high as 50.8 L/m2h (acetone), which is 6.57 times greater than that of the pure GO membrane. Furthermore, these GO-Melamine nanocomposite membranes showed excellent durability against both common and harsh organic solvents, and the flux of solvents through the GO-M0.02 nanocomposite membrane remained almost unchanged even after being immersed in methanol for up to one week. Additionally, the membrane exhibited consistent solvent flux and rejection rates for methyl green during continuous filtration. These results highlight the exceptional stability and immense potential of GO-melamine nanocomposite membranes for real organic solvent nanofiltration. © 2024 Elsevier B.V.

关键词： Nanofiltration

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A variational quantum algorithm for tackling multi-dimensional Poisson equations with inhomogeneous boundary conditions

arXiv

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arXiv 2024年

作者： Choi, Minjin ryu, Hoon Center for Quantum Information R&D Korea Institute of Science and Technology Information Daejeon34141 Korea Republic of Department of Artificial Intelligence Engineering Kumoh National Institute of Technology Gyeongsangbuk-do Gumi39177 Korea Republic of

We design a variational quantum algorithm to solve multi-dimensional Poisson equations with mixed boundary conditions that are typically required in various fields of computational science. Employing an objective function that is formulated with the concept of the minimal potential energy, we not only present in-depth discussion on the cost-efficient & noise-robust design of quantum circuits that are essential for evaluation of the objective function, but, more remarkably, employ the proposed algorithm to calculate bias-dependent spatial distributions of electric fields in semiconductor systems that are described with a two-dimensional domain and up to 10-qubit circuits. Extending the application scope to multi-dimensional problems with mixed boundary conditions for the first time, fairly solid computational results of this work clearly demonstrate the potential of variational quantum algorithms to tackle Poisson equations derived from physically meaningful problems. Copyright © 2024, The Authors. All rights reserved.

关键词： Poisson equation

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Mussel-inspired modification of 2d MoS2 to construct a hybrid nanocomposite membrane with enhanced pervaporation dehydration of isopropanol

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Journal of Environmental Chemical engineering 2024年第1期12卷

作者： Gallardo, Marwin r. Ciou, Jyun-Xiang Wang, Chen-Hsiu Ang, Micah Belle Marie Yap Millare, Jeremiah C. Li, Chi-Lan Tsai, Hui-An Huang, Shu-Hsien Lee, Kueir-rarn R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan

In this work, a thin-film nanocomposite (TFN) membrane was constructed using a hybrid polydopamine (Pd)-MoS2 (MoS2@Pd) filler for pervaporation dehydration of isopropanol. The exfoliated MoS2 was first modified through bio-inspired coating of Pd. The resulting MoS2@Pd with different weight ratio with respect to PEI was then deposited into the hydrolyzed polyacrylonitrile support through pressure-assisted filtration, followed by crosslinking with trimesoyl chloride. Characterization experiments were performed with the membranes using Attenuated Total reflectance Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy, Energy-dispersive X-ray Spectroscopy, Field Emission Scanning Electron Microscopy, Atomic Force Microscopy, and water contact angle analyses. The Pd serves as a bridging agent between MoS2 and the crosslinked PEI, enhancing the membrane's physicochemical properties, including surface morphology and hydrophilicity. For membrane performance on pervaporation dehydration of 70/30 wt% isopropanol/water mixture at 25 °C, the addition of MoS2@Pd led to a simultaneous increase in permeation total flux and water content in the permeate. Notably, MoS2@Pd0.3-TFN membrane demonstrated a permeation flux of 2870.10 g∙m−2∙h−1 and 0.86/99.14 wt% isopropanol/water permeate mixture. The membrane also maintained stable performance under varying feed concentration, feed temperature, and long-term operations. This study contributes valuable insights into the development of MoS2-based membrane with enhanced pervaporation separation performance. © 2023 Elsevier Ltd

关键词： Scanning electron microscopy

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High performance lamellar structured graphene oxide nanocomposite membranes via Fe3O4-coordinated phytic acid control of interlayer spacing for organic solvent nanofiltration (OSN)

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Chemical engineering Journal 2024年 495卷

作者： Abebe, Shalligito Habetamu Subrahmanya, T.M. Austria, Hannah Faye M. Nayak, Smrutiranjan Huang, Tsung-Han Setiawan, Owen Hung, Wei-Song Hu, Chien-Chieh Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan R&D Center for Membrane Technology Chung Yuan University Chung-Li32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32023 Taiwan

Graphene oxide (GO), a 2d nanomaterial known for its precise molecular sieving, holds potential for Organic Solvent Nanofiltration (OSN) and wastewater treatment. However, challenges such as thin interlayer spacing, extended diffusion pathways, and susceptibility to dehydration and negative charge-induced swelling limit its separation performance. To overcome these limitations, Herein, we have fabricated novel Fe3O4 coordinated PhA intercalated GO nanocomposite membranes. Impressively, these nanocomposite membranes exhibited remarkable separation efficiency for dyes, pesticides, and pharmaceutical ingredients, addressing the drawbacks associated with pristine GO membranes and enhancing their overall performance. The optimum G10(1)/P1.5-F100µL nanocomposite membrane displayed impressive solvent permeance of 40.43, 33.45, 20.70, 16.24, and 5.6 L/m2 h bar for acetone, methanol, water, ethanol, and IPA, respectively, while maintaining a rejection rate of ≥98.97 % for the MO dye (MW = 327.33 g/mol). Furthermore, the membrane exhibited outstanding efficiency in separating tetracycline (TC) in ethanol (≥97.97 %) and Pendimethalin (PM) in water (≥99.88 %). Additionally, it demonstrated high rejection capabilities for MB (≥98 %) and Cr (≥98.78 %) in harsh dMF solvent. Importantly, the nanocomposite membrane displayed outstanding durability throughout continuous separation of Pendimethalin (PM) in a water solution over a period of 168 h. The PM separation remained nearly unchanged for the entire 168-h duration, demonstrating high mechanical strength and chemical stability. Additionally, the single nanocomposite membrane showcased high efficiency in feed change separation, successfully separating Cr in ethanol and PM in water. These results, compared to the other GO-based nanocomposite membranes, demonstrate the exceptional stability and immense potential for real OSN applications. © 2024 Elsevier B.V.

关键词： Magnetite

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Optimization design method of optical encoders based on cascaded half-integer MMIs

Optimization design method of optical encoders based on casc...

引用

OptoElectronics and Communications Conference, OECC

作者： Meilin Zhong Yu Chen Wei Cao Shenghao Liu Xu Sun Gordon Ning Liu School of Electronic and Information Engineering Soochow University Suzhou China Silicon Photonics R&D Center CreaLights Technology Co. Ltd. Suzhou China Jiangsu New Optical Fiber Technology and Communication Network Engineering Research Center and School of Electronic and Information Engineering Soochow University Suzhou China

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

An automated method is proposed to optimize a compact optical encoder based on half-integer multimode interferometers (MMIs). We employ the improved particle swarm optimization (PSO) algorithm to reconfigure the phase shifters. Good convergence and robustness are demonstrated by applying the method into the switch of encoding states under fabrication errors.

关键词： Optical interferometry Optical switches Optical device fabrication Optical propagation Optimization methods Couplers Adaptive optics Optical coupling robustness Particle swarm optimization

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Polyol grafted thin film nanocomposite membrane: Enhanced pervaporation performance for isopropanol dehydration

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Separation and Purification technology 2024年 328卷

作者： Chu, Min-Yi Ang, Micah Belle Marie Yap Millare, Jeremiah C. Yang, Hong-Li Huang, Shu-Hsien Tsai, Hui-An Lee, Kueir-rarn R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan

Isopropanol is used as a cleaning agents especially in the semiconductor industry. Thus, recycling, and purifying alcohol can reduce the overall cost of production. To improve the separation performance of the thin-film nanocomposite (TFN) membrane, nanozeolite (NZ) was embedded in polyamide layer followed by post-treatment of polyols. The polyamide layer was fabricated through interfacial polymerization of diethylenetriamine (dETA) and trimesoyl chloride (TMC). NZ was dispersed in TMC in order to be embedded on the separation layer. Afterwards, the membrane was simultaneously post-treated using polyols. different types of polyols were introduced: d-sorbitol (dST), erythritol (ErT), and pentaerythritol (PET). A higher number of hydroxyl groups can provide a denser separation layer. Their chemical structures also affects the reaction rate, where more linear structures (dST and ErT) had better reaction and crosslinking with acyl chloride. High reaction rate of dST gives the roughest surface and high crosslinking degree. Compared to other polyols, Using dST in post-treatment exhibited the highest separation performance. It had a permeation flux of 3,098 g·m−2·h−1 and 99.9 wt% water concentration in permeate (feed = 70 wt% aqueous isopropanol solution at 25℃). Therefore, post-treatment using polyols can further enhance the separation efficiency of TFN membranes with a stable performance over a long period of time. © 2023 Elsevier B.V.

关键词： Pervaporation

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