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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Purnaini, Rizki Sudarmadji Purwono, Suryo Doctoral Program of Environmental Science School of Postgraduate Studies Gadjah Mada University Yogyakarta Indonesia Department of Environmental Geography Faculty of Geography Gadjah Mada University Yogyakarta Indonesia Department of Chemical Engineering Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia

The Kapuas Kecil River is strongly influenced by tidal, in the dry season the intrusion of surface water is often a problem for the WTP because it causes the change of raw water quality to be processed. The purpose of this study was to examine the effect of sea tides on water quality of the Kapuas Kecil River. The study was conducted in Kapuas River downstream along ± 30 km from the upper boundary to the estuary. Water sampling is carried out during the dry and rainy season, when the tidal conditions at 7 (seven) locations of the monitoring station. Descriptive analysis methods and regression-correlation statistics are used to determine the effect of tides on water quality in Kapuas River downstream. In general, the water quality of the Kapuas Kecil River has exceeded the criteria of first class water quality, ie water that can be used for drinking water. The status of water quality of the Kapuas Kecil River based on the pollution index calculation shows the condition of the river is "mild to medium pollutants". The result of multiple linear regression analysis got the value of coefficient of determination (adjusted R square) = 0,760, which in whole show that independent variable (tidal and distance) influence to dependent variable (value of TDS) equal to 76%. © 2018 The Authors, published by EDP sciences.

关键词： Rivers

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Imaging real-time amorphization of hybrid perovskite solar cells under electrical biasing

arXiv

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arXiv 2020年

作者： Kim, Min-Cheol Ahn, Namyoung Cheng, Diyi Xu, Mingjie Pan, Xiaoqing Kim, Suk Jun Luo, Yanqi Fenning, David P. Tan, Darren H.S. Zhang, Minghao Ham, So-Yeon Jeong, Kiwan Choi, Mansoo Meng, Ying Shirley Department of NanoEngineering University of California San Diego 9500 Gilman Drive San diegoCA92093 United States Global Frontier Center for Multiscale Energy Systems Seoul National University Seoul08826 Korea Republic of Materials Science and Engineering Program University of California San Diego 9500 Gilman Drive San diegoCA92093 United States Irvine Materials Research Institute University of California Irvine IrvineCA92697 United States Department of Materials Science and Engineering University of California Irvine IrvineCA92697 United States Department of Physics and Astronomy University of California Irvine IrvineCA92697 United States School of Energy Materials and Chemical Engineering Korea University of Technology and Education Cheonan31253 Korea Republic of University of California San Diego San diegoCA92093 United States Department of Mechanical Engineering Seoul National University Seoul08826 Korea Republic of

Perovskite solar cells have drawn much attention in recent years, owing to its world-record setting photovoltaic performances. Despite its promising use in tandem applications and flexible devices, its practicality is still limited by its structural instability often arising from ion migration and defect formation. While it is generally understood that ion instability is a primary cause for degradation, there is still a lack of direct evidence of structural transformation at the atomistic scale. Such an understanding is crucial to evaluate and pin-point how such instabilities are induced relative to external perturbations such as illumination or electrical bias with time, allowing researchers to devise effective strategies to mitigate them. Here, we designed an in-situ TEM setup to enable real-time observation of amorphization in double cation mixed perovskite materials under electrical biasing at 1 V. It is found that amorphization occurs along the (001) and (002) planes, which represents the observation of in-situ facet-dependent amorphization of a perovskite crystal. To reverse the degradation, the samples were heated at 50 oC and was found to recrystallize, effectively regaining its performance losses. This work is vital toward understanding fundamental ion-migration phenomena and address instability challenges of perovskite optoelectronics. Copyright © 2020, The Authors. All rights reserved.

关键词： Perovskite

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The Identification and Distribution Components of Polycyclic Aromatic Hydrocarbon Contaminants at the Port of Paotere, Makassar, South Sulawesi

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IOP Conference Series: Earth and Environmental science 2021年第1期679卷

作者： I Marzuki I Pratama H E Ismail I. Paserangi M Kamaruddin M. Chaerul R Ahmad Department of Chemical Engineering Fajar University Panakukang-Makassar South Sulawesi Indonesia 90231 Department of Mechanical Engineering Fajar University Panakukang Makassar South Sulawesi Indonesia 90231 Academy of Midwifery of Tahirah Al Baeti Bulukumba District South Sulawesi Indonesia 92513 Program of Infrastructure and Environmental Engineering Fajar University Makassar South Sulawesi Indonesia 90231 Department of Chemistry Faculty of Science and Technology Universitas Airlangga Kampus C-UNAIR Mulyorejo Surabaya East Java Indonesia 60115

The ASTM standard recommends that the 16 most common types of PAHs are found in petroleum processing activities, the chemical industry and marine loading ports. This research aims to identify and determine the distribution of PAHs contaminants at three sampling points of seawater around Paotere Port, Makassar, South Sulawesi, using the GC-MS instrument. Sampling point A is the center of Paotere Port activity, Point B with a radius of 3 km and point C with a radius of 6 km from the center of port activity. Sampling at each point was carry out at a depth of 100 cm above sea level. There are 10 PAHs identified at sampling point A and B, while at point C there are 8 components with relatively the same type of PAHs. The dominant PAHs components at each sampling point are relatively the same, namely at point A: Pyrene, Chrysene, Benz[a]pyrene and Dibenz(a,h)anthracene, point B: Pyrene, Chrysene and Benz(a)anthtracene, while at point C only Pyrene. The total concentration of PAHs at point A: 4,217±.106 ppm, medium polluted category, at point B: 2,124±.087 ppm, medium polluted category and at point C: 1,264±. 112 ppm, light polluted category.

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Recent Advances in Living Cationic Polymerization with Emerging Initiation/Controlling Systems

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macromolecular rapid communications 2021年第13期42卷 e2100148页

作者： Yinan Chen Lu Zhang Yi Jin Xinrong Lin Mao Chen State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 P. R. China. Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China.

While the conventional living cationic polymerization (LCP) provided opportunities to synthesizing well-defined polymers with predetermined molecular weights, desirable chemical structures and narrow dispersity, it is still important to continuously innovate new synthetic methods to meet the increasing requirements in advanced material engineering. Consequently, a variety of novel initiation/controlling systems have be demonstrated recently, which have enabled LCP with spatiotemporal control, broadened scopes of monomers and terminals, more user-friendly operations and reaction conditions, as well as improved thermomechanical properties for obtained polymers. In this work, recent advances in LCP is summarized with emerging initiation/controlling systems, including chemical-initiated/controlled cationic reversible addition-fragmentation chain transfer (RAFT) polymerization, photoinitiated/controlled LCP, electrochemical-controlled LCP, thionyl/selenium halide-initiated LCP, organic acid-assisted LCP, and stereoselective LCP. It is hoped that this summary will provide useful knowledge to people in related fields and stimulate new ideas to promote the development and application of LCP in both academia and industry.

关键词： catalysis cationic RAFT polymerization living cationic polymerization photocontrolled polymerization vinyl ethers

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Retraction notice to "Cellulose microcrystalline: A promising ecofriendly approach to control Culex quinquefasciatus larvae" [STOTEN 901 (2023) 165952]

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The science of the total environment 2024年 957卷 177685页

作者： Sindoval Silva de Souza Alex Rodrigues Gomes Abraão Tiago Batista Guimarães Aline Sueli de Lima Rodrigues Letícia Paiva de Matos Juliana Dos Santos Mendonça Thiarlen Marinho da Luz Stênio Gonçalves da Silva Matos M Safiur Rahman Chinnasamy Ragavendran Sengottayan Senthil-Nathan Ajay Guru Md Refat Jahan Rakib Nabisab Mujawar Mubarak Md Mostafizur Rahman Thiago Lopes Rocha Abu Reza Md Towfiqul Islam Guilherme Malafaia Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goi'as Goiânia GO Brazil Laboratory of Toxicology Applied to the Environment Goiano Federal Institute - Urutaí Campus Rodovia Geraldo Silva Nascimento 25 km Zona Rural Urutaí GO Brazil. Laboratory of Toxicology Applied to the Environment Goiano Federal Institute - Urutaí Campus Rodovia Geraldo Silva Nascimento 25 km Zona Rural Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil. Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil. Department of Environmental Science and Disaster Management Noakhali Science and Technology University Noakhali 3814 Bangladesh. Saveetha Dental College and Hospitals (SIMATS) Saveetha University Chennai Tamil Nadu India. Division of Biopesticides and Environmental Toxicology Sri Paramakalyani Centre for Excellence in Environmental Sciences Manonmaniam Sundaranar University Alwarkurichi Tirunelveli Tamil Nadu 627 412 India. Department of Cariology Saveetha Dental College and Hospitals SIMATS Chennai 600 077 Tamil Nadu India. Noakhali Science and Technology University Noakhali Bangladesh. Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri Begawan BE1410 Brunei Darussalam Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India. Jahangirnagar University Dhaka 1342 Bangladesh. Laboratory of Environmental Biotechnology and Ecotoxicology Institute of Tropical Pathology and Public Health Federal University of Goiás Goiânia Goiás Brazil. Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh. Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil

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Spatiotemporal Control of Morphogen Delivery to Pattern Stem Cell Differentiation in Three-Dimensional Hydrogels

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Current Protocols in Stem Cell Biology 2019年第1期51卷 e97页

作者： Balikov, Daniel A. Lippmann, Ethan S. Bellan, Leon M. Department of Mechanical Engineering Vanderbilt University Nashville TN United States Interdisciplinary Materials Science Program Vanderbilt University Nashville TN United States Department of Biomedical Engineering Vanderbilt University Nashville TN United States Department of Chemical and Biomolecular Engineering Vanderbilt University Nashville TN United States

Morphogens are biological molecules that alter cellular identity and behavior across both space and time. During embryonic development, morphogen spatial localization can be confined to small volumes in a single tissue or permeate throughout an entire organism, and the temporal effects of morphogens can range from fractions of a second to several days. In most cases, morphogens are presented as a gradient to adjacent cells within tissues to pattern cell fate. As such, to appropriately model development and build representative multicellular architectures in vitro, it is vital to recapitulate these gradients during stem cell differentiation. However, the ability to control morphogen presentation within in vitro systems remains challenging. Here, we describe an innovative platform using channels patterned within thick, three-dimensional hydrogels that deliver multiple morphogens to embedded cells, thereby demonstrating exquisite control over both spatial and temporal variations in morphogen presentation. This generalizable approach should have broad utility for researchers interested in patterning in vitro tissue structures. © 2019 by John Wiley & Sons, Inc. © 2019 John Wiley & Sons, Inc.

关键词： differentiation gradient hydrogel morphogen stem cell tissue engineering

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Sensitivity analysis of gas distribution pipeline risk assessment methodology in Indonesia

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AIP Conference Proceedings 2020年第1期2230卷

作者： Andy Noorsaman Sommeng Fristy Rizcky Nurzaneal Mikael Januardi Ginting Sonya Pebriani Muhamad Sahlan Heri Hermansyah Anondho Wijanarko 1Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Depok Indonesia 2Marine Science Postgraduate Program Faculty of Mathematics and Natural Science Universitas Indonesia Depok Indonesia 3Research Centre for Biomedical Engineering Faculty of Engineering Universitas Indonesia Depok Indonesia

Sensitivity is the effect of changes in any variables on changes in the risk results. The most common Risk Assessment Methodology in Indonesia is Muhlbauer, Modified Muhlbauer & Risk-Based Inspection. This study evaluated six natural gas distribution pipeline segments. In general, there are two objectives, firstly comparing the risk result between Risk Assessment Methodology. The following objectives are to compare the sensitivity. The Risk Assessments methodology is translated into a mathematic model and computed in Monte Carlo based simulation software. The risk value result shows that in high risk & medium risk pipeline segments, all methodology is valid with 24% and 13% deviation, respectively. The sensitivity analysis result shows that Muhlbauer & Modified Muhlbauer’s methodology is sensitive to third party activity. Risk-Based Inspection is sensitive to intrinsic damage mechanisms. This sensitivity data can be adopted to develop a more sensitive Risk Assessment Methodology for gas pipeline in the future.

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Thiol‐Ene Cationic and Radical Reactions: Cyclization, Step‐Growth, and Concurrent Polymerizations for Thioacetal and Thioether Units

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Angewandte Chemie 2020年第17期132卷

作者： Mineto Uchiyama Masahiro Osumi Kotaro Satoh Masami Kamigaito Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1-H120 Ookayama Meguro-ku Tokyo 152-8550 Japan

Thiol‐ene cationic and radical reactions were conducted for 1:1 addition between a thiol and vinyl ether, and also for cyclization and step‐growth polymerization between a dithiol and divinyl ether. p ‐Toluenesulfonic acid (PTSA) induced a cationic thiol‐ene reaction to generate a thioacetal in high yield, whereas 2,2′‐azobisisobutyronitrile resulted in a radical thiol‐ene reaction to give a thioether, also in high yield. The cationic and radical addition reactions between a dithiol and divinyl ether with oxyethylene units yielded amorphous poly(thioacetal)s and crystalline poly(thioether)s, respectively. Under high‐dilution conditions, the cationic and radical reactions resulted in 16‐ and 18‐membered cyclic thioacetal and thioether products, respectively. Furthermore, concurrent cationic and radical step‐growth polymerizations were realized using PTSA under UV irradiation to produce polymers having both thioacetal and thioether linkages in the main chain.

关键词： Copolymere Cyclisierungen Polymerisation Radikale Synthesemethoden

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DONOR-ACCEPTOR CONJUGATED POLYMER BASED ON ISOINDIGO WITH STRONG FLUORESCENCE FOR ELECTROCHROMIC, MEMORY, EXPLOSIVE DETECTION AND PHOTODETECTOR

DONOR-ACCEPTOR CONJUGATED POLYMER BASED ON ISOINDIGO WITH ST...

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第八届高分子化学国际学术研讨会

作者： Qingyi Lu Haijun Niu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education Department of Macromolecular Science and Engineering School of Chemistry and Chemical Engineering Heilongjiang University

We reported that a series of novel D–A conjugated polymers based on isoindigo were synthesis and *** novel electrochromic materials,their optical,electrochemical have been *** voltammograms(CV)of the polymer films on the indium–tin oxide(ITO)coated glass substrate exhibited two pairs of obvious redox peaks in the range of 0.76 V-1.65 V with strong color changes in

关键词： DONOR-ACCEPTOR CONJUGATED POLYMER BASED ON ISOINDIGO WITH STRONG FLUORESCENCE FOR ELECTROCHROMIC EXPLOSIVE DETECTION AND PHOTODETECTOR MEMORY

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Effect of TPU soft segment molecular weight on TPU’s bead foaming behavior

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AIP Conference Proceedings 2020年第1期2205卷

作者： Bige Bati Emine Bursa Kucuk Mohammadreza Nofar Polymer Science and Technology Program Istanbul Technical University Maslak Istanbul 34469 Turkey Metallurgical & Materials Engineering Department Faculty of Chemical and Metallurgical Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey

The bead foaming behavior of three different thermoplastic polyurethane (TPU) samples with different polyol soft-segment molecular weights was investigated through a lab-scale bead foaming reactor. These TPU samples possessed similar hard-segment content and soft-segment molecular weights of 1000, 2000, and 3500 g/mol. The evolution of the hard-segment crystallization during the isothermal saturation as well as the increased solubility of supercritical CO2 within the soft-segment region are, respectively, determinative parameters on improving the heterogeneous cell nucleation and expansion of the expanded TPU (ETPU) bead foams. The effect of saturation temperature, pressure, and time on the hard-segment crystallization and hence on the foaming behavior of TPU samples were explored. The results showed that the increase in soft-segment molecular weight increased the expansion ratio of the bead foams while the processing parameters differently influenced the hard-segment crystallization and CO2 solubility and hence the foaming behavior of ETPU foams.

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