检索结果-内蒙古大学图书馆

10th International Conference on Theoretical and Applied Physics, ICTAP 2020

作者： Nazarudin Hasibuan, M.P.H. Haryadi, B. Nurhayati Ulyarti Hadiyanto Chemical Engineering FST University of Jambi Jambi Indonesia Energy and Nano Material Centre LPPM Universitas Jambi Jambi Indonesia Center of Excellent on Bio-Geo Material and Energy Universitas Jambi Jambi Indonesia Department of Enviromental Study Program University of Jambi Jambi Indonesia Department of Science Education Program University of Jambi Jambi Indonesia

Bioenergy is one of the renewable energies which is predicted to be a main energy in the next few years. It can play the important role to change the current fossil fuel-based energy into a green energy which has a low carbon footprint. A research about how to develop a bioenergy have been done by a lot of reseacher. However, especially in Indonesia, there is just few research to study about bioenergy from societal aspects poin of view such as the understanding and awarness of bioenergy among citizens. In this research, we have investigated senior high school students' knowledge, perceptions, and attitudes interconected to bioenergy with online survery. The survey instrument used in the study was adopted from P. Halder's study. The data was collected from students at senior high school th (SMAN 10) Jambi City. The results showed that the students awareness of bioenergy perceived from school, home, and social media have significant effects on their knowledge, perceptions and attitudes related to bioenergy. Among 211 students as respondent (N), we found 70.62% believe that they understand well the concept about bioenergy, 5.21% believe that they understand it very well, and the rest believe that they do not understand it. This understanding reflects to their willingness to use a bioenergy in their daily life, in which 71.70% respondents agree to use bioenergy, 25.47% respondents can not decide, and only 2.83% do not want to use it. To find the relationship among the variables, a multiple regression was conducted. A statistical analysis showed that the model for knowledge as a function of attitudes and perception does not fit the data therefore this model is rejected. However, both model for attitudes as function of perception and knowledge, and also perception as function of attitudes and knowldeges fit the data hence the models are accepted. In other words, attitudes of students who will use/not use bioenergy, is significantly affected by their perception about bioen

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

Discrete Element Method to Model Tension and Bending for Single Layer 3-Dimension Systems with Bimodal and Pseudo-Full Particle Size Distributions of Spherical Particles

Discrete Element Method to Model Tension and Bending for Sin...

引用

TAPPICon LIVE 2021

作者： Varney, Dan Toivakka, Martti Bousfield, Doug OMYA Inc. ProctorVT05765 United States Laboratory of Paper Coating and Converting Åbo Akademi University Turku Finland Paper Surface Science Program Department of Chemical and Biomedical Engineering University of Maine OronoME04469 United States

ISBN: (纸本)9781713848370

The mechanical properties of paper coating layers are important in converting operations such as calendering, printing and, folding. While a number of experimental and theoretical studies have advanced our knowledge of these systems, a good particle level understanding of issues like crack-at-the-fold are lacking. In this paper, the three-dimensional version of the discrete element method (DEM) model of Varney et al. (2019) has been modified. The particles used in the model have been expanded from the standard monodisperse packing of spherical particles to bimodal distributions of spherical particles and also to pseudo-full particle size distributions of spherical particles. In making this upgrade to the model, the impact of particle size distribution on the mechanical properties of the coating layer could be studied. Simulations were run for both in-line tension and for three-point bending of single coating layer systems. As with past models, inputs to the 3D version include properties of the pure binder film and the binder concentration. The model predicts crack formation as a function of these parameters and can also calculate the modulus, the maximum stress, and the strain-at-failure. The simulation results were compared to the work of Zhu et al. (2014) and of Hashemi-Najafi et al. (2018). Reasonable predictions were obtained for both tensile and bending for a range of latex-starch ratios and at various pigment concentrations. In addition, the model predicted the correct trends and order of magnitude relative to the experimental data. Copyright© 2021 by the TAPPI Press, All rights reserved.

关键词： Particle size analysis

来源：评论

学校读者我要写书评

暂无评论

Peroxymonosulfate Activation by Ni-Fe (Hydr)Oxides Through Radical and Nonradical Pathways for Efficient Organic Pollutant Degradation

SSRN

引用

SSRN 2022年

作者： Deng, Jia Chen, Weiguo Wu, Feng Dai, Yitao Dionysiou, Dionysios D. Huang, Li-Zhi School of Civil Engineering Wuhan University No. 8 East Lake South Road Wuhan430072 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University 430072 China School of Resources and Environmental Science Wuhan University Wuhan China Department of Applied Chemistry University of Science and Technology of China Hefei230026 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering University of Cincinnati CincinnatiOH45221-0012 United States

Peroxymonosulfate (PMS)-based advanced oxidation processes have become promising water treatment technologies in recent years due to the generation ability of powerful oxidative radicals. The redox cycle between transitional metals in heterogeneous catalysis is essential for the continuous activation of PMS, which determines the removal efficiency of organic pollutants. In this work, we first prepared Fe3O4 using precipitation method under alkaline anoxic conditions and subsequently added Ni2+ aqueous solution to synthesize Ni-Fe (hydr)oxide catalysts. Ni-Fe (hydr)oxide catalysts show efficient PMS activation ability, causing the degradation of organic pollutants including trichloroethylene, perchloroethylene, bisphenol A, phenol, and tribromophenol. In Ni-Fe (hydr)oxides/PMS system, nonradical pathway is dominant at the initial stage of the reaction which generates SO5•− and indirectly produces 1O2. In this system, 1O2 and dissolved O2 together participate in the O2 cycling, •OH generation, and electron transfer involving the reduction of Ni(III). The formed Ni(II) reacted with PMS to generate strong oxidative •OH and SO4•− through radical pathway for pollutant degradation. The optimum Ni/Fe ratio of Ni-Fe (hydr)oxide catalysts under the studied conditions was 0.50. Ni-Fe (hydr)oxides show high reactivity and stability in real water matrices, demonstrating Ni-Fe (hydr)oxides are promising catalysts for PMS activation to degrade organic pollutants in contaminated water. © 2022, The Authors. All rights reserved.

关键词： Organic pollutants

来源：评论

学校读者我要写书评

暂无评论

Photochemical Upcycling of Ultrastrong Polyethylene Nanomembranes into Fibrous Carbon at Ambient Conditions

arXiv

引用

arXiv 2023年

作者： Sun, Yuexiang Ma, Xin Gu, Qiao Gao, Ping Division of Emerging Interdisciplinary Areas Interdisciplinary Program Office The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong Guangzhou Nansha511400 China Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong

The escalating global issue of plastic waste accumulation, specifically polyolefins, necessitates an urgent solution for upcycling these materials into beneficial compounds. Yet, achieving such upcycling without introducing carbon dioxide into the environment remains a formidable challenge. In this study, we demonstrate an eco-friendly approach for the photochemical conversion of ultrastrong, ultratransparent, and ultrathin polyethylene membrane into fibrous carbon nanomembrane at ambient conditions. The membrane was sputter-coated with platinum and cuprous oxide nanoparticles and exposed to simulated sunlight, resulting in a porous carbon membrane decorated with Pt nanoparticles. The new carbonized nanomembrane maintained the pristine membrane's morphology. The membrane exhibited high activity (2.11 mA/cm2) for electrochemical ethanol oxidation with stability over 1000 cycles. This work holds significance for sustainable plastic waste management and the design of new polyolefin materials in a circular economy. Copyright © 2023, The Authors. All rights reserved.

关键词： Nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Statistical behavior of nonequilibrium and living biological systems subjected to active and thermal fluctuations

引用

Physical Review E 2022年第1期105卷 014415-014415页

作者： Ashesh Ghosh Andrew J. Spakowitz Department of Chemical Engineering Stanford University Stanford California 94305 USA Department of Materials Science Stanford University Stanford California 94305 USA Department of Chemistry Stanford University Stanford California 94305 USA Department of Applied Physics Stanford University Stanford California 94305 USA Biophysics Program Stanford University Stanford California 94305 USA

We present a path-integral formulation of the motion of a particle subjected to fluctuating active and thermal forces. This general framework predicts the statistical behavior associated with the stochastic trajectories of the particle, accounting for all possible realizations of Brownian and active forces, over an arbitrary potential landscape. Temporal correlations in the active forces result in non-Markovian statistics, necessitating the inclusion of a fixed active-force value at specified times within the statistical treatment. We specialize our theory to that of exponentially correlated active forces for a particle in a harmonic potential. We find the exact results for the statistical distributions for the initial position of the particle, accounting for the impact of the correlated active forces at all times prior to the initial time. Our theory is then used to find the two-point distribution for the active Brownian particle, which governs the joint probability that a particle begins and ends at specified locations. Analyses of the active Brownian statistics demonstrate that the impact of active forces can be interpreted through a time-dependent temperature whose influence depends on the competition of timescales of the active-force correlation and the relaxation time of the particle in the harmonic potential. The general results presented in this work are transferable to a broad range of nonequilibrium systems with active and Brownian motion, and the time-dependent temperature serves as a governing principle to describe the competition of timescales associated with active forces and internal relaxation processes.

关键词： Nonequilibrium fluctuations Nonequilibrium statistical mechanics Active brownian particles Active matter Nonequilibrium systems

来源：评论

学校读者我要写书评

暂无评论

Cell- And Serum-Derived Proteins Act as DAMPs to Activate RAW 264.7 Macrophages in the Foreign Body Response to Silicone Implants

SSRN

引用

SSRN 2023年

作者： Blackman, Samuel A. Miles, Dalton Suresh, Joshita Calve, Sarah Bryant, Stephanie J. Department of Chemical and Biological Engineering University of Colorado Boulder 3415 Colorado Ave BoulderCO80309-0596 United States Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Dr BoulderCO80309-0427 United States BioFrontiers Institute University of Colorado Boulder 3415 Colorado Ave BoulderCO80309-0596 United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Dr BoulderCO80300-0613 United States

Protein adsorption after biomaterial implantation is the first stage of the foreign body response (FBR). However, the source(s) of the adsorbed proteins that lead to damaged associated molecular patterns (DAMPs) and induce inflammation has not been fully elucidated. This study examined the effects of different protein sources: cell-derived (from a NIH/3T3 fibroblast cell lysate) and serum-derived (from fetal bovine serum), which were compared to implant-derived proteins (after a 30-min subcutaneous implantation in mice) on activation of RAW 264.7 macrophages cultured in minimal (serum-free) medium. Both cell-derived and serum-derived protein sources when pre-adsorbed to either tissue culture polystyrene or medical grade silicone induced macrophage activation. The combination led to an even higher expression of pro-inflammatory cytokines genes and proteins. Implant-derived proteins on silicone explants induced a rapid inflammatory response that then subsided more quickly and to a greater extent than the studies with in vitro cell-derived or serum-derived protein sources. Proteomic analysis of the implant-derived proteins identified proteins that included cell-derived and serum-derived, but also other protein sources (e.g., extracellular matrix), suggesting the latter may help to temper the inflammatory response in vivo. These findings indicate that both serum-derived and cell-derived proteins can act as DAMPs to drive inflammation in the FBR, but that other protein sources may play an important role in controlling inflammation. © 2023, The Authors. All rights reserved.

关键词： Proteins

来源：评论

学校读者我要写书评

暂无评论

Synergistic Effect of Fe Nanoparticles Supported on Nanoporous Carbon for Catalyzing Hydrogen Storage Properties of Mg(Bh4)2

SSRN

引用

SSRN 2023年

作者： Wahab, Md. Abdul Karim, Mohammad Rezaul Al-Mubaddel, Fahad S. Sindan, A. Will, Geoffrey Abdala, Ahmed Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology The University of Queensland St Lucia BrisbaneQLD4072 Australia Energy and Process Engineering Division School of Mechanical Medical and Process Engineering Science and Engineering Faculty Queensland University of Technology 2 George Street QLD4001 Australia Chemical Engineering Program Texas A and M University Education City Doha Qatar King Saud University Riyadh11421 Saudi Arabia K.A. CARE Energy Research and Innovation Center King Saud University Riyadh11451 Saudi Arabia Chemical Engineering Department King Saud University PO Box 800 Riyadh11421 Saudi Arabia

This study investigates synergistic effects of Fe nanoparticles (FeNPs) supported on mesoporous carbon (MC) for catalyzing hydrogen storage properties of Mg(BH4)2 (MBH). The study compares two methods for dispersing Fe NPs in MC: (i) ultrasonication nanoconfinement (un) and (ii) postnanoconfinement (pn) via stirring. Based on the results, it is found that the ultrasonication nanoconfinement method can effectively disperse the FeNPs with 5 nm in MC support (FeNP-unMC), later which can efficiently confine MBH (FeNP-un-MC@MBH system). The hydrogen (H2) desorption properties of the FeNP-un-MC@MBH system were found to be better than that of postconfinement-mediated FeNP-pn-MC@MBH system. For instance, H2 started to desorb from the FeNP-un-MC@MBH system at only 66°C (Tonset) and reached its peak at ~153°C, compared to 270°C (Tonset) and its peak ~350°C for pure MBH, respectively. The ultrasonication-mediated nanoconfined FeNP-un-MC@MBH system released a total of 7.01 wt% H2 within 90 minutes at 350°C. The study shows that the activation energy (Ea) of FeNP-un-MC@MBH is 19.57 kJ/mol, achieved due to the improved dehydrogenation kinetics of MBH. These improvements are due to the synergistic effects of nano-compartmentalization and highly dispersed Fe NP catalyst sites in the MC support. The research emphasizes the promising application of ultrasonication-mediated nanoconfined Fe NPs in mesoporous carbon which can be used as an effective catalyst for enhancing the hydrogen storage properties of metal-based hydrides (MBH). © 2023, The Authors. All rights reserved.

关键词： Hydrogen storage

来源：评论

学校读者我要写书评

暂无评论

Green Synthesis and Characterizations of Cobalt Oxide Nanoparticles and Their Coherent Photocatalytic and Antibacterial Investigations

引用

Water (Switzerland) 2023年第5期15卷 910页

作者： Chelliah, Parvathiraja Wabaidur, Saikh Mohammad Sharma, Hari Prapan Jweeg, Muhsin J. Majdi, Hasan Sh. AL. Kubaisy, Munthir Mohammed Radhy Iqbal, Amjad Lai, Wen-Cheng Department of Physics Manonmaniam Sundaranar University Tamilnadu Tirunelveli627012 India Department of Chemistry College of Science King Saud University P.O. Box-2455 Riyadh11451 Saudi Arabia Department of Business Management GLA University Uttar Pradesh Mathura281406 India College of Technical Engineering Al-Farahidi University Baghdad10070 Iraq Department of Chemical Engineering and Petroleum Industries Al-Mustaqbal University College Babylon51001 Iraq Department of Medical Physics The University of Mashreq Baghdad10001 Iraq Department of Materials Technologies Silesian University of Technology Gliwice44-100 Poland Bachelor Program in Industrial Projects National Yunlin University of Science and Technology Douliu640301 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology Douliu640301 Taiwan

Water pollution is a serious concern for developing and undeveloped countries. Photocatalytic degradation of organic pollutants is an effective degradation method to restrain the green ecosystem. This research article presents a green, low-cost, and benevolent eco-friendly biosynthesis of cobalt oxide (Co3O4) nanoparticles using Curcuma longa plant extract. The UV and visible region absorbance of Co3O4 nanoparticles estimated the Co2+ and Co3+ transitions on the lattice oxygen, and their bandgap of 2.2 eV was confirmed from the UV-DRS spectroscopy. The cubic structure and spherical shape of Co3O4 nanoparticles were estimated by using XRD and TEM characterizations. Plant molecules aggregation and their agglomerations on the nanoparticles were established from FTIR and EDX spectroscopy. Multiple cobalt valences on the oxygen surfaces and their reaction, bonding, and binding energies were analyzed from XPS measurements. The biogenic Co3O4 nanoparticles were executed against gram-positive (Staphylococcus aureus—S. aureus) and gram-negative (Escherichia coli—E. coli) bacteria. A gram-positive bacterial strain exhibited great resistivity on Co3O4 nanoparticles. Degradation of organic dye pollutants on the Co3O4 nanoparticles was performed against methylene blue (MB) dye under the conditions of visible light irradiation. Dye degradation efficiency pseudo-first-order kinetics on the pseudo-first-order kinetics denotes the rate of degradation over the MB dye. This research work achieved enhanced degradation potency against toxic organic dye and their radicals are excited from visible light irradiations. Absorption light and charged particle recombinations are reformed and provoked by the plant extract bio-molecules. In this process, there is no inferior yield development, and electrons are robustly stimulated. Furthermore, the biosynthesized Co3O4 nanoparticles determined the potency of bacterial susceptibility and catalytic efficacy over the industrial dye pollutants. © 202

关键词： Fourier transform infrared spectroscopy

来源：评论

学校读者我要写书评

暂无评论

The influence of preparation and pretreatment on the physicochemical properties and performance of plant-based biocoagulants in treating wastewater

引用

Environmental Advances 2023年 14卷

作者： Kurniawan, Setyo Budi Ahmad, Azmi Said, Nor Sakinah Mohd Gustinasari, Kiki Abdullah, Siti Rozaimah Sheikh Imron, Muhammad Fauzul Laboratory of Algal Biotechnology Centre Algatech Institute of Microbiology of the Czech Academy of Sciences Opatovický mlýn Novohradská 237 Třeboň 379 81 Czech Republic Department of Petrochemical Engineering Politeknik Tun Syed Nasir Syed Ismail Johor Pagoh 84600 Malaysia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia (UKM) Selangor Bangi 43600 Malaysia Study Program of Environmental Engineering Department of Biosystem Engineering Faculty of Agricultural Engineering Universitas Brawijaya Malang 65145 Indonesia Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Kampus C UNAIR Jalan Mulyorejo Surabaya 60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft 2628 Netherlands

Biocoagulants have gained attention as an alternative to chemical coagulants in water and wastewater treatment due to their ability to remove pollutant parameters such as turbidity, suspended solids, color, and organic compounds. Plant-based biocoagulants are currently the most promising due to their abundant availability and reliable performance. A proper preparation of plant-based biocoagulants is required to ensure the active compounds from the plants can be extracted. Plant raw materials are prepared into biocoagulants using drying and grinding, extraction, and purification. In mechanical preparation, drying and grinding exhibit great influence on the performance of plant-based biocoagulants due to the removal of moisture and higher contact with the carrier medium during dissolution. A smaller biocoagulant's size resulted in up to 78 % higher removal of turbidity. In chemical preparation, the oil needs to be removed before extracting the active ingredients to avoid low active compound extraction yields. The defatting of Moringa oleifera seeds showed an 18 % higher protein content. Salt and alcohol extractions were mentioned as superior extraction methods to obtain carbohydrate and protein from plant-based biocoagulants compared to water extraction, with up to a 5 % increment in turbidity removal. Preparation and pretreatment protocols have a great influence on the properties and performance of plant-based biocoagulants. Further extension of research on plant-based biocoagulants should address the problems in the initial characterization of plant material, standard pretreatment and preparation protocols, and real-scale application of plant-based biocoagulants. © 2023 The Author(s)

关键词： Biocoagulant Coagulant Environmental pollution Extraction Properties Synthesis

来源：评论

学校读者我要写书评

暂无评论

Performance evaluation of emerging block copolymer membranes for oil-water separation

引用

Green Technology, Resilience, and Sustainability 2022年第1期2卷 1-11页

作者： Al-Maas, Mashael Hussain, Altaf Minier-Matar, Joel Hassan, Mohammad K. Al-Maadeed, Mariam Al Ali Alamgir, Karim Adham, Samer ConocoPhillips Global Water Sustainability Center Qatar Science & Technology Park Doha Qatar Center for Advanced Materials Qatar University Doha Qatar Materials Science & Technology Program College of Arts & Sciences Qatar University Doha Qatar Department of Chemical & Biomolecular Engineering University of Houston Houston USA

Membrane processes such as microfiltration (MF) and ultrafiltration (UF) are known to be the best advanced technologies for water reuse application. Numerous research efforts have been conducted in areas of modifying commercial MF/UF products or synthesizing novel materials promising enhanced oil-water separation performances. Block copolymer (BCP)-based membranes have recently gained increased popularity due to their improved water permeabilities. This study applies a comprehensive testing protocol for performance evaluation of two emerging poly (styrene-block-methyl methacrylate) BCP membranes developed by the project team. Tests mimicking industrial conditions were conducted by using a representative synthetic produced water and operating repeat tests. Both BCP membranes (referred to as A & B) were found to possess high permeabilities of 5538 and 12,424 LMH/bar, respectively. Membrane B showed higher organic rejection at 79% against 74% rejection obtained for membrane A. The novel membranes were then compared to a relevant commercial product. Lower permeability at 3831 LMH/bar and slightly higher rejection performance (within ~ 10%) were obtained for the commercial membrane as compared to the BCP membranes. Test results obtained for those novel membranes being still in the development stage will be utilized in future studies investigating further optimization of the membrane structure and oil-water separation performance.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：