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Performance of the in situ microcosm technique for measuring the degradation of organic chemicals in aquifers

GROUNd WATER MONITORING ANd REMEdIATION 1996年第1期16卷 130-140页

作者： Nielsen, ph.Christensen, TH Albrechtsen, HJ Gillham, RW Per H. Nielsen received his Ph.D. from the Institute of Environmental Science and Engineering at the Technical University of Denmark Lyngby in 1994. He is currently employed at the same institute as a research associate (Institute of Manufacturing Engineering Bldg. 403 Technical University of Denmark DK-2800 Lyngby Denmark). His research interest is waste management and life cycle assessment. Robert W. Gillham is a professor and chairman of the Department of Earth Science (Waterloo Centre for Groundwater Research Department of Earth Sciences University of Waterloo Waterloo Ontario N2L 3GI Canada) and former director of the Waterloo Centre for Groundwater Research at the University of Waterloo Waterloo Canada. He holds a Ph.D. in soil physics from the University of Illinois. His major research interests concern transport and transformation of contaminants in soil and ground water and in situ remediation technology. Hans-Jorgen Albrechtsen received his Ph.D. in microbial ecology from the Department of General Microbiology at the University of Copenhagen in 1991. He is currently an assistant professsor at the Institute of Environmental Science and Engineering at the Technical University of Denmark Lyngby (Groundwater Research Centre Bldg. 115 Technical University of Denmark DK-2800 Lyngby Denmark). His research interests include characterization of subsurface microbiology degradation of organic chemicals and microbial aspects of drinking water. Thomas H. Christensen received his Ph. D. from the University ofWashington Seattle in 1980 and a Dr.agro. in soil chemistry from the Royal Agricultural University in Copenhagen in 1990. He is a professor in environmental engineering and associate director of the Groundwater Research Centre at the Technical University of Denmark Lyngby (Institute of Environmental Science and Engineering Groundwater Research Centre Bldg. 115 Technical University of Denmark DK-2800 Lyngby Denmark). His research interests include waste disposalonland heavy metal soil

An in situ microcosm (ISM) consists of a stainless steel cylinder isolating about 2 L of the aquifer and is equipped with valves allowing for loading and sampling from the ground surface. during the last five years, this technique has been used frequently to study the degradation of organic chemicals in polluted and pristine aquifers representing different redox environments. The ISM technique has great potential for providing field-relevant degradation potentials and rate constants, but care must be taken in using the equipment and interpreting the results. This paper provides details concerning the installation and operation of an ISM and presents experiences concerning data interpretation and monitoring of redox conditions.

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Curricular Structure for Teaching Ethical and Professional Conduct in Optics and ph.tonics

Curricular Structure for Teaching Ethical and Professional C...

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2021 Education and Training in Optics and ph.tonics Conference, ETOP 2021

作者： Kuebler, Steph.n M. Beever, Jonathan Pinkert, Laurie CREOL College of Optics and Photonics OrlandoFL32816 United States Chemistry Department OrlandoFL32816 United States Materials Science and Engineering Center for Ethics OrlandoFL32816 United States Department of Philosophy OrlandoFL32816 United States Texts and Technology Ph.D. Program OrlandoFL32816 United States

A full course focused on ethics and professional practice has been developed to complement technical coursework and provide comprehensive training for engineers studying optics. Related frameworks for ethical encultur... 详细信息

ISBN: (纸本)9781557528209

关键词： Personnel training

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Acoustic Scene Classification Using Perceptually Weighted Log Mel Spectrogram and Buttom-up Broadcast Neural Network

Acoustic Scene Classification Using Perceptually Weighted Lo...

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IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： Riyad Ali Ahmad Abuirbaiha Chang-Hsing Lee Cheng Chang Lien Ph.D. Program in Engineering Science Chung Hua University Hsinchu Taiwan Bachelor Program in Industrial Artificial Intelligence Ming Chi University of Technology New Taipei City Taiwan Department of Computer Science and Information Engineering Chung Hua University Hsinchu Taiwan

ISBN: (数字)9798350386844

ISBN: (纸本)9798350386851

The study explores various 2d feature representations including spectrogram, MFCC spectrogram, log Mel-spectrogram, and the perceptual weighted log Mel-spectrogram (PW-LMSP) for acoustic scene classification (ASC). These 2d feature representations were classified using a bottom-up broadcast neural network (BBNN). The experimental results have shown that PW-LMSP outperforms other 2d representations. Further, the proposed method (PW-LMSP with BBNN) achieves accuracies of 91.2% and 91.6% respectively on the dCASE2018 and dCASE2019 development datasets, outperforming all the submissions in dCASE2018 and dCASE2019, as well as state-of-the-art approaches.

关键词： Scene classification Accuracy Neural networks LoRa Feature extraction Acoustics Mel frequency cepstral coefficient

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design of Mixed-dimensional Qds/MoS2/TiO2 Heterostructured Resistive Random-Access Memory with Interfacial Analog Switching Characteristics for Potential Neuromorph.c Computing

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ACS Applied Electronic Materials 2024年第3期6卷 1581-1589页

作者： Tang, Shin-Yi Shih, Yu-Chuan Shen, Ying-Chun Cyu, Ruei-Hong Chen, Chieh-Ting Yang, Tzu-Yi Chaudhary, Mayur Peng, Yu-Ren Kuo, Yao-Ren Miao, Wen-Chien Yu, Yi-Jen Lee, Ling Kuo, Hao-Chung Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan Ph. D. Program in Prospective Functional Materials Industry National Tsing Hua University Hsinchu30013 Taiwan Department of Electrophysics College of Science National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Instrument Center National Tsing Hua University Hsinchu30013 Taiwan Department of Photonics Institute of Electro-Optical Engineering National Yang-Ming Chiao Tung University Hsinchu30010 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of

Resistive random-access memory (RRAM) is one of the most promising candidates for next-generation nanoscale nonvolatile memory devices and neuromorph.c computing applications. In this study, we developed a novel mixed-dimensional design for RRAM devices, incorporating zero-dimensional quantum dots (Qds), two-dimensional MoS2, and a TiO2 switching layer to achieve prominent interfacial switching behaviors. Compared with typical filamentary RRAM devices, the proposed heterostructure featured a light-sensitive Qds/MoS2 layer that allowed for bias-controllable resistive changes during the set and reset processes without abrupt switching. This was endowed by effective electron-hole pair separations upon excitation and the generation of a thin molybdenum oxide (MoOx) layer due to the accumulation of oxygen ions at the interface between MoS2 and TiO2. The ITO/Qds/MoS2/TiO2/Pt RRAM device exhibited an on/off ratio of 10 with improved endurance under 515 nm laser illumination and wavelength-dependent resistive switching behavior, making it useful for multilevel storage. Furthermore, the heterostructured device demonstrated synaptic characteristics with enhanced potentiation and depression nonlinearities and asymmetry factors, revealing its potential for future neuromorph.c applications. © 2024 American Chemical Society.

关键词： Titanium dioxide

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POTENTIAL FOR SOLUTE RETARdATION ON MONITORING WELL SANd PACKS ANd ITS EFFECT ON PURGING REQUIREMENTS FOR GROUNdWATER SAMPLING

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GROUNd WATER MONITORING ANd REMEdIATION 1987年第2期7卷 40-47页

作者： PALMER, Cd KEELY, JF FISH, W Carl D. Palmer is an assistant professor in the Department of Environmental Science and Engineering at the Oregon Graduate Center (19600 N. W. von Neumann Dr. Beaverton OR 97006-1999). He received his Ph. D. in hydrogeology from the Department of Earth Science at the University of Waterloo (Waterloo Ontario). He was with the Department of Geological and Geophysical Sciences at the University of Wisconsin-Milwaukee before joining the Oregon Graduate Center. Dr. Palmer's research interests are in ground water monitoring solute transport and hydrogeochemistry. Joseph F. Keely received a B. S. in professional chemistry and an M. S. in hydrology from the University of Idaho and a Ph. D. from Oklahoma State University. He is an assistant professor in the Department of Environmental Science andEngineering at the Oregon Graduate Center (19600 N. W. von Neumann Dr. Beaverton OR 97006-1999). His research interests are focused on the improvement of field methods used to characterize sub-surface contaminant transport processes and the integration of technical issues into ground water policy. He is a certified professional hydrogeologist (AIH no. 483) and is a consultant to the U. S. Department of Justice for Superfund cases. He continues to collaborate with U. S. EPA's Office of Research and Development where he worked for five years as hydrologist. William Fish Ph. D. is a research scientist in the Department of Environmental Science and Engineering at the Oregon Graduate Center (19600 N. W. von Neumann Dr. Beaverton OR 97006-1999). He received his B. S. E. in environmental engineering from the University of Florida and holds a doctorate in aquatic sciences/civil engineering from the Massachusetts Institute of Technology. His research centers on trace metal geochemistry in both surface and subsurface waters with special emphasis on complexation reactions redox chemistry and the influence of microbial organisms on these processes.

Monitoring well sand packs are theoretically capable of retarding metal ions and organic contaminants. If this retardation does indeed occur it may have a significant effect on the purging requirements of newly installed monitoring wells. Calculations based on mass balance and retardation concepts demonstrate that if common guidelines for well purging are followed, contaminants may not be detected or may be detected in lower concentrations than are actually present in the ground water. This problem is greatest in relatively shallow wells installed in low to moderate permeability materials. In most cases, the effect of solute retardation in the sand pack can be avoided simply by additional purging prior to the first sampling of the monitoring well. Common purging guidelines can then be applied to subsequent samplings. The methodology outlined in this paper can be used to calculate the purging requirements of existing monitoring wells or it may be applied to alternative monitoring well designs to test which will require the smallest volume of purged water.

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Release of gold nanoparticles from ph.tomined biomass by enzymatic digestion

Release of gold nanoparticles from phytomined biomass by enz...

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2006 AIChE Annual Meeting

作者： Marshall, A.T. Haverkamp, R.G. davies, C.E. Parsons, J.G. Gardea-Torresdey, J.L. Van Agterveld, d. Institute of Technology and Engineering Massey University Private Bag 11222 Palmerston North New Zealand Environmental Science and Engineering Ph.D Program and Department of Chemistry University of Texas at EI Paso 500 West University Avenue EI Paso TX 79968-0513 United States Akzo Nobel Research and Technology Chemicals Department of Chemicals Analytics and Physics Microstructure Analysis and Atomic Spectrometry P.O. Box 9300 6800 SB Arnhem Netherlands

ISBN: (纸本)081691012X

Gold nanoparticles are produced in some plants when soluble gold is present in the growth medium nutrients. Release and recovery of this gold by pyrolysis can sinter the particles, and enzymatic digestion is proposed as an alternative. Brassica juncea grown on soil containing low levels of gold, copper and silver (22-48 mg Au kg-1, 44-45 mg Cu kg-1 and 0-31 mg Ag kg -1 respectively) contained gold at weight concentrations circa 1000 ppm dry matter. 55-60 wt% of the dried plant matter was solubilised by enzymatic digestion, but 50-60% of the gold initially present was lost to solution during the digestion. XANES analysis shows that gold is present in the plant in approximately equal quantities in the metallic (Auo) and oxidized (Au+1) states. The gold lost during digestion is thought to be gold present in the plant in a soluble form (Au+1).

关键词： Gold nanoparticles

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Enhancing wound healing and adhesion through dopamine-assisted gelatin-silica hybrid dressings

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International Journal of Biological Macromolecules 2024年第Part2期258卷 128845页

作者： Lin, Yu-Chien Wang, Huey-Yuan Tang, Yao-Chun Lin, Wan-Rong Tseng, Ching-Li Hu, Chih-Chien Chung, Ren-Jei Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei10608 Taiwan School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore Department of Stomatology MacKay Memorial Hospital Taipei104217 Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International Ph. D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Research Center of Biomedical Device College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International Ph. D. Program in Cell Therapy and Regenerative Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Bone and Joint Research Center Chang Gung Memorial Hospital Linkou33305 Taiwan Taipei10608 Taiwan

Gelatin, widely employed in hydrogel dressings, faces limitations when used in high fluid environments, hindering effective material adhesion to wound sites and subsequently reducing treatment efficacy. The rapid degradation of conventional hydrogels often results in breakdown before complete wound healing. Thus, there is a pressing need for the development of durable adhesive wound dressings. In this study, 3-glycidoxypropyltrimethoxysilane (GPTMS) was utilized as a coupling agent to create gelatin-silica hybrid (G-H) dressings through the sol-gel method. The coupling reaction established covalent bonds between gelatin and silica networks, enhancing structural stability. dopamine (dP) was introduced to this hybrid (G-H-d) dressing to further boost adhesiveness. The efficacy of the dressings for wound management was assessed through in-vitro and in-vivo tests, along with ex-vivo bioadhesion testing on pig skin. Tensile bioadhesion tests demonstrated that the G-H-d material exhibited approximately 2.5 times greater adhesion to soft tissue in wet conditions compared to pure gelatin. Moreover, in-vitro and in-vivo wound healing experiments revealed a significant increase in wound healing rates. Consequently, this material shows promise as a viable option for use as a moist wound dressing. © 2023

关键词： Adhesion

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Cuisine Image Recognition and Recommender System using Convolutional Neural Network

Cuisine Image Recognition and Recommender System using Convo...

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IEEE Eurasia Conference on IOT, Communication and engineering (ECICE)

作者： Chin-Chih Chang Chi-Hung Wei Kuan-Yun Wu Hao-Xiang Kao Sean Hsiao Department of Computer Science and Information Engineering Chung Hua University Hsinchu Taiwan Ph.D. Program in Engineering Science Chung Hua University Hsinchu Taiwan Department of Computer Science and Information Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Bachelor Program of Applied Foreign Language and Smart Commerce Chung Hua University Hsinchu Taiwan

The fusion of technology and culinary exploration has allowed for the emergence of advanced online customer service systems. We developed a novel approach to enhance the dining experience. We used a Cuisine Image Recognition and Recommender System (CIRRS) powered by Convolutional Neural Network (CNN) to identify and suggest diverse cuisines based on visual inputs. CIRRS swiftly identified diverse cuisines from user-captured images, offering information on origin, ingredients, and variations by crawling websites. The system enhanced dining experiences by suggesting personalized menus based on individual preferences and past selections. Extensively tested across various culinary genres, CIRRS consistently demonstrated accuracy and adaptability. User feedback validated its potential to simplify dining choices and elevate satisfaction. This innovative system enriched dining experiences as a valuable tool for culinary enthusiasts, chefs, and restaurateurs, bridging the gap between technology and gastronomy, It also offers a unique way to explore Taiwanese cuisines.

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NIR-Responsive Methotrexate-Modified Iron Selenide Nanorods for Synergistic Magnetic Hyperthermic, ph.tothermal, and Chemodynamic Therapy

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ACS Applied Materials and Interfaces 2024年第20期16卷 25622-25636页

作者： Thirumurugan, Senthilkumar Muthiah, Kayalvizhi Samuvel Lin, Yu-Chien dhawan, Udesh Liu, Wai-Ching Wang, An-Ni Liu, Xinke Hsiao, Michael Tseng, Ching-Li Chung, Ren-Jei No. 1 Section 3 Zhongxiao East Road Taipei10608 Taiwan Centre for the Cellular Microenvironment Division of Biomedical Engineering James Watt School of Engineering Mazumdar-Shaw Advanced Research Centre University of Glasgow GlasgowG116EW United Kingdom Faculty of Science and Technology Technological and Higher Education Institute of Hong Kong Hong Kong New Territories999077 Hong Kong Scrona AG Grubenstrasse 9 Zürich8045 Switzerland College of Materials Science and Engineering Chinese Engineering and Research Institute of Microelectronics Shenzhen University Shenzhen518060 China Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Genomics Research Center Academia Sinica Taipei115 Taiwan Department and Graduate Institute of Veterinary Medicine School of Veterinary Medicine National Taiwan University Taipei10617 Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International Ph.D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Research Center of Biomedical Device College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International Ph.D. Program in Cell Therapy and Regenerative Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Taipei10608 Taiwan

Breast cancer is a malignant tumor with a high mortality rate among women. Therefore, it is necessary to develop novel therapies to effectively treat this disease. In this study, iron selenide nanorods (FeSe2 NRs) were designed for use in magnetic hyperthermic, ph.tothermal, and chemodynamic therapy (MHT/PTT/CdT) for breast cancer. To illustrate their efficacy, FeSe2 NRs were modified with the chemotherapeutic agent methotrexate (MTX). MTX-modified FeSe2 (FeSe2-MTX) exhibited excellent controlled drug release properties. Fe2+ released from FeSe2 NRs induced the release of •OH from H2O2 via a Fenton/Fenton-like reaction, enhancing the efficacy of CdT. Under alternating magnetic field (AMF) stimulation and 808 nm laser irradiation, FeSe2-MTX exerted potent hyperthermic and ph.tothermal effects by suppressing tumor growth in a breast cancer nude mouse model. In addition, FeSe2 NRs can be used for magnetic resonance imaging in vivo by incorporating their superparamagnetic characteristics into a single nanomaterial. Overall, we presented a novel technique for the precise delivery of functional nanosystems to tumors that can enhance the efficacy of breast cancer treatment. © 2024 The Authors. Published by American Chemical Society

关键词： Magnetic resonance imaging

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Intrinsic synaptic plasticity of ferroelectric field effect transistors for online learning

arXiv

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arXiv 2021年

作者： Saha, Arnob Nafiul Islam, A.N.M. Zhao, Zijian deng, Shan Ni, Kai Sengupta, Abhronil School of Electrical Engineering & Computer Science Pennsylvania State University University ParkPA16802 United States Microsystems Engineering Ph.D. program Rochester Institute of Technology RochesterNY14623 United States

Nanoelectronic devices emulating neuro-synaptic functionalities through their intrinsic ph.sics at low operating energies is imperative toward the realization of brain-like neuromorph.c computers. In this work, we leverage the non-linear voltage dependent partial polarization switching of a ferroelectric field effect transistor to mimic plasticity characteristics of biological synapses. We provide experimental measurements of the synaptic characteristics for a 28nm high-k metal gate technology based device and develop an experimentally calibrated device model for large-scale system performance prediction. decoupled read-write paths, ultra-low programming energies and the possibility of arranging such devices in a cross-point architecture demonstrate the synaptic efficacy of the device. Our hardware-algorithm co-design analysis reveals that the intrinsic plasticity of the ferroelectric devices has potential to enable unsupervised local learning in edge devices with limited training data. Copyright © 2021, The Authors. All rights reserved.

关键词： E-learning

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