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SSRN 2023年

作者： Önden, İsmail Deveci, Muhammet Kara, Karahan Yalçın, Galip Cihan Önden, Abdullah eker, Mert Hasseb, Mouad Smart System Research Group of TUBITAK TUSSIDE Turkey Department of Industrial Engineering Turkish Naval Academy National Defence University Turkey The Bartlett School of Sustainable Construction University College London LondonWC1E 6BT United Kingdom Artvin Çoruh Universty Hopa Vocational School Logistics Program Artvin Turkey Kırıkkale University Faculty of Mathematics Institute of Science and Technology Kırıkkale Turkey Department of International Trade and Finance Yalova University Turkey Fabrikod Yalova University Turkey

environmental approaches play an active role in the production platform as well as in the supply chain. Studies that deal with supplier selection problems in the supply chain with a green focus have recently intensified. In this research, the supplier selection problem of companies providing "last mile" service, which is seen as the last step of transportation, is handled with a green focus. The supplier selection problem of these companies is differentiated according to strategic and non-strategic product groups. In this study, a green-oriented supplier selection proposal is presented for both the strategic product group and the non-strategic product group. The supplier selection problem is accepted as a multi-criteria decision making problem (MCDM). Thus, the type-2 neutrosophic numbers (T2NNs) - based CRiteria Importance Through Intercriteria Correlation (CRITIC) – based Multi-Attributive Border Approximation Area Comparison (-MABAC) hybrid model is applied to evaluate the green-oriented supplier. The motivation of the study is to determine the best alternative supplier type for strategic and non-strategic products groups. In this context, two cases are created, ten criteria are selected, and three supplier types are determined. Supplier types are as follows: (i) Classical suppliers, (ii) Classical to green centric suppliers, and (iii) Start-Ups & green centric suppliers. In addition, the findings are strengthened by creating twenty-two sensitivity analysis scenarios. As a result of the research, solution proposals for both product groups of the last mile service company are developed. © 2023, The Authors. All rights reserved.

关键词： Supply chains

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Identification of Groundwater Potential Zones in Samendeni Watershed in Sedimentary and Semi-Arid Contexts of Burkina Faso, Using Analytic Hierarchy Process (AHP) Method and GIS

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American Journal of Climate Change 2023年第1期12卷 172-203页

作者： Sadraki Yabre Youssouf Koussoubé Sauret Élie Serge Gaëtan Nicaise Yalo Stephen Silliman West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL) Doctoral Research Program in Climate Change and Water Resources Institut National de l’eau Université d’Abomey Calavi Cotonou Bénin Laboratoire Géosciences et Environnement (LaGE) Département des Sciences de la Terre Université Joseph KI-ZERBO/Unité de Formation et de Recherche en Sciences de la Vie et de la Terre Ouagadougou Burkina Faso Centre National de Recherche Scientifique et Technologique Institut de l’Environnement et de Recherches Agricoles-Département Gestion des Ressources Naturelles/Systèmes de Productions DRREA-Ouest Station de Farako-ba Bobo-Dioulasso Burkina Faso Laboratoire d’Hydrologie Appliquée (LHA) Institut National de l’eau Université d’Abomey Calavi Cotonou Bénin School of Science Technology Engineering and Math Trevecca Nazarene University Nashville Tennessee USA

Demand for water increases in Samendeni regarding the undertaken agricultural projects while pressure on surface water from global warming/evapotranspiration also increases. Thus, the need to evaluate the groundwater potential in the catchment is crucial as alternative supplier of water and resilience to climate hazards. The AHP was performed integrating ten influencing factors such as geomorphology, geology, soil, land use/land cover (lulc), slope, rainfall, drainage density, borehole rate & depth and piezometric level to generate groundwater potential zones (GWPZs) in Samendeni watershed (4420 km²). All the factors were processed and ranged into five (5) classes. Weight was assigned to each class of thematic layer. These thematic layers were then reclassified based on the normalized weight to be used in the calculation of groundwater potential zones (GWPZ). The final output, groundwater potential map, revealed a significant groundwater potential with very good (11%), good (31%), moderate (30%), poor (20%), and very poor (8%) of proportion. The interesting (very good, good) GWPZs in the study area are mostly in the central towards the east. The poor zones in term of groundwater potential are concentrated in the upper west region of the watershed. Besides the cross-validation with the relationship between different groundwater potential zones and the wells available in the study area, the overall accuracy was estimated to 88% provided from the result of the similarity analysis where 22 out of the 25 validation wells match with the expected yield classes of GWPZs. The statistics from that validation revealed the performance of AHP method to delineate groundwater potential zones at catchment level.

关键词： Climate Change Resilience Groundwater Potential Water Management Conjunctive Use AHP GIS Samendeni Watershed

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Thymine DNA glycosylase as a novel target for melanoma (vol 38, pg 3710, 2019)

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ONCOGeNe 2022年第23期41卷 3300-3301页

作者： Mancuso, Pietro Tricarico, Rossella Bhattacharjee, Vikram Cosentino, Laura Kadariya, Yuwaraj Jelinek, Jaroslav Nicolas, emmanuelle einarson, Margret Beeharry, Neil Devarajan, Karthik Katz, Richard A. Dorjsuren, Dorjbal G. Sun, Hongmao Simeonov, Anton Giordano, Antonio Testa, Joseph R. Davidson, Guillaume Davidson, Irwin Larue, Lionel Sobol, Robert W. Yen, Timothy J. Bellacosa, Alfonso Cancer Epigenetics Program Fox Chase Cancer Center 333 Cottman Avenue Philadelphia PA 19111 USA Department of Medical Biotechnologies Universita’ degli Studi di Siena Siena Italy Institut Curie PSL Research University INSERM U1021 Normal and Pathological Development of Melanocytes 91405 Orsay France Sbarro Institute for Cancer Research and Molecular Medicine Department of Biology College of Science and Technology Temple University Philadelphia PA 19122 USA Equipe Labellisée Ligue Contre le Cancer Orsay France University Paris-Sud University Paris-Saclay CNRS UMR3347 Orsay France Cancer Biology Program Fox Chase Cancer Center 333 Cottman Avenue Philadelphia PA 19111 USA Fels Institute for Cancer and Molecular Biology Temple University School of Medicine Philadelphia PA 19140 USA Department of Biostatistics Fox Chase Cancer Center 333 Cottman Avenue Philadelphia PA 19111 USA Division of Preclinical Innovation National Center for Advancing Translational Sciences National Institutes of Health Rockville MD 20850 USA Institut de Génétique et de Biologie Moléculaire et Cellulaire CNRS/INSERM/ULP 67404 Illkirch France Department of Oncologic Sciences Mitchell Cancer Institute University of South Alabama Mobile AL 36604 USA

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Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. III. Dynamically Tagged Groups and Chemodynamical Properties

arXiv

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arXiv 2024年

作者： Zhang, Ruizhi Matsuno, Tadafumi Li, Haining Aoki, Wako Xue, Xiang-Xiang Suda, Takuma Zhao, Gang Chen, Yuqin Ishigaki, Miho N. Shi, Jianrong Xing, Qianfan Zhao, Jingkun CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Yuquan Road Shijingshan District Beijing100049 China Astronomisches Rechen-Institut Zentrum für Astronomie der Universität Heidelberg Mönchhofstraße 12-14 Heidelberg69120 Germany National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Liberal Arts Tokyo University of Technology Nishi Kamata 5-23-22 Ota-ku Tokyo144-8535 Japan Research Center for the Early Universe The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan

Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them essential tools for unraveling the early stages of Galaxy formation. Understanding the origin of VMP stars requires comprehensive studies of their chemical compositions and kinematics, which are currently lacking. Hence, we conduct a chemodynamical analysis of 352 VMP stars selected from one of the largest uniform high-resolution VMP star samples, jointly obtained from LAMOST and Subaru. We apply a friends-of-friends clustering algorithm to the master catalog of this high-resolution sample, which consists of 5778 VMP stars. It results in 131 dynamically tagged groups with 89 associated with known substructures in the Milky Way, including Gaia-Sausage-enceladus (GSe), Thamnos, Helmi streams, Sequoia, Wukong, Pontus, and the very metal-poor disk (VMPD). Our findings are: (i) the VMPD shows lower Zn abundances than the rest, which indicates that it could be a relic of small stellar systems;(ii) Sequoia shows moderately high r-process abundances;(iii) Helmi streams show deficiencies in carbon and light neutron-capture elements;(iv) the fraction of carbon-enhanced metal-poor stars with no enhancement in heavy elements (CeMP-no stars) seems low in the VMPD and the Helmi streams;and (v) a subgroup in GSe exhibits a very high fraction of r-process enhanced stars, with four out of five showing [eu/Fe]> +1.0. The abundance patterns of other elements in VMP substructures largely match the whole VMP sample. We also study large-scale correlations between abundance ratios and kinematics without classifying stars into substructures, but it does not yield significant correlations once the overall chemical evolution is considered for most elements. © 2024, CC BY.

关键词： Stars

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The magnetic field in quiescent star-forming filament G16.96+0.27

arXiv

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arXiv 2024年

作者： Gu, Qi-Lao Liu, Tie Shen, Zhi-Qiang Jiao, Sihan Montillaud, Julien Juvela, Mika Lu, Xing Lee, Chang Won Liu, Junhao Li, Pak Shing Liu, Xunchuan Johnstone, Doug Kwon, Woojin Kim, Kee-Tae Tatematsu, Ken’ichi Sanhueza, Patricio Ristorcelli, Isabelle Koch, Patrick Zhang, Qizhou Pattle, Kate Hirano, Naomi Alina, Dana Di Francesco, James Shanghai Astronomical Observatory Chinese Academy of Sciences No.80 Nandan Road Xuhui Shanghai200030 China National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang Beijing100101 China Université de Franche-Comté CNRS Institut UTINAM OSU THETA BesançonF-25000 France Department of Physics University of Helsinki PO box 64 FI-00014 Finland Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejeon34055 Korea Republic of University of Science and Technology 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of National Astronomical Observatory of Japan 2-21-1 Osawa Tokyo Mitaka181-8588 Japan NRC Herzberg Astronomy and Astrophysics 5071 West Saanich Rd VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria VictoriaBCV8P 5C2 Canada Department of Earth Science Education Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Center Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of The Center for Educational Research Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Nobeyama Radio Observatory National Astronomical Observatory of Japan National Institutes of Natural Sciences Nobeyama Minamimaki Minamisaku Nagano384-1305 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Tokyo Mitaka181-8588 Japan IRAP Université de Toulouse CNRS 9 avenue du Colonel Roche BP 44346 Toulouse31028 Cedex 4 France Academia Sinica Institute of Astronomy and Astrophysics No. 1 Section 4 Roosevelt Road Taipei10617 Taiwan Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Department of Physics School of Science and Technology Nazarbayev University Astana010000 Kazakhs

We present 850 µm thermal dust polarization observations with a resolution of 14.4′′(∼ 0.13 pc) towards an infrared dark cloud G16.96+0.27 using JCMT/POL-2. The average magnetic field orientation, which roughly agrees with the larger-scale magnetic field orientation traced by the Planck 353 GHz data, is approximately perpendicular to the filament structure. The estimated plane-of-sky magnetic field strength is ∼ 96 µG and ∼ 60 µG using two variants of the Davis-Chandrasekhar-Fermi methods. We calculate the virial and magnetic critical parameters to evaluate the relative importance of gravity, the magnetic field, and turbulence. The magnetic field and turbulence are both weaker than gravity, but magnetic fields and turbulence together are equal to gravity, suggesting that G16.96+0.27 is in a quasi-equilibrium state. The cloud-magnetic-field alignment is found to have a trend moving away from perpendicularity in the dense regions, which may serve as a tracer of potential fragmentation in such quiescent filaments. © 2024, CC BY.

关键词： Stars

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Associations of cord plasma per- and polyfluoroakyl substances (PFAS) with neonatal and child body composition and adiposity: The GUSTO study

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environment International 2024年 183卷 108340页

作者： Chen, Ling-Wei Ng, Sharon Tint, Mya-Thway Michael, Navin Sadananthan, Suresh Anand Ong, Yi Ying Yuan, Wen Lun Chen, Ze-Ying Chen, Chia-Yang Godfrey, Keith M. Tan, Kok Hian Gluckman, Peter D. Chong, Yap-Seng eriksson, Johan G. Yap, Fabian Lee, Yung Seng Fortier, Marielle V. Velan, Sendhil S. Chan, Shiao-Yng Institute of Epidemiology and Preventive Medicine College of Public Health National Taiwan University No. 17 Xu-Zhou Road Taipei10055 Taiwan Master of Public Health Program College of Public Health National Taiwan University No. 17 Xu-Zhou Road Taipei10055 Taiwan Singapore Institute for Clinical Sciences Agency for Science Technology and Research 30 Medical Drive 117609 Singapore Human Potential Translational Research Program Yong Loo Lin School of Medicine National University of Singapore Singapore Department of Paediatrics Yong Loo Lin School of Medicine National University of Singapore 1E Kent Ridge Road 119228 Singapore Department of Social and Behavioral Sciences Harvard T.H. Chan School of Public Health BostonMA United States ParisF-75004 France Institute of Food Safety and Health College of Public Health National Taiwan University No. 17 Xu-Zhou Road Taipei10055 Taiwan MRC Lifecourse Epidemiology Centre & NIHR Southampton Biomedical Research Centre University of Southampton & University Hospital Southampton NHS Foundation Trust Tremona Road SO16 6YD Southampton United Kingdom Duke-NUS Medical School 8 College Road 169857 Singapore Department of Reproductive Medicine KK Women's and Children Hospital Singapore Singapore Liggins Institute University of Auckland 85 Park Rd Grafton Auckland1023 New Zealand Department of Obstetrics & Gynaecology Yong Loo Lin School of Medicine National University of Singapore 1E Kent Ridge Road 119228 Singapore Department of General Practice and Primary Health Care University of Helsinki Haartmaninkatu 8 Helsinki00290 Finland Folkhälsan Research Center Topeliusgatan 20 Helsinki00250 Finland Department of Pediatric Endocrinology KK Women's and Children's Hospital 100 Bukit Timah Road 229899 Singapore Khoo Teck Puat-National University Children's Medical Institute National University Health System 1E Kent Ridge Road 119228 Singapore Department of Diagnostic & Interventional Imaging KK Women's and Childre

Background: The influence of prenatal exposure to per- and poly- fluoroalkyl substances (PFAS) on birth size and offspring adiposity is unclear, especially for the newer, shorter-chained replacement PFAS. Methods: In the GUSTO multi-ethnic Singaporean mother-offspring cohort, 12 PFAS were measured in 783 cord plasma samples using ultra-performance-liquid chromatography-tandem-mass-spectrometer (UPLC-MS/MS). Outcomes included offspring anthropometry, other indicators of body composition/metabolic health, and MRI-derived abdominal adiposity (subset) at birth and 6 years of age. PFAS were modeled individually, in categories of long-chain and short-chain PFAS, and as scores of three principal components (PC) derived using PC analysis (PC1, PC2, and PC3 reflect predominant exposure patterns to "very-long-PFAS", "long-PFAS", and "short-PFAS", respectively). Associations with outcomes were assessed using multivariable linear regressions, adjusted for important covariates such as maternal sociodemographic and lifestyle factors. Results: Overall, cord PFAS levels showed either no or positive associations (mostly for long-chain PFAS) with birth weight, length and head circumference. In general, PFAS were associated with higher neonatal abdominal adiposity, driven by shorter-chain PFAS. Perfluoroheptanoic acid (PFHpA) was associated with higher volumes of superficial subcutaneous adipose tissue (sSAT) (3.75 [1.13, 6.37] mL per SD increase in PFAS) and internal adipose tissue (IAT) (1.39 [0.41, 2.38] mL). Higher levels of perfluorobutanesulfonic acid (PFBS), short-chain PFAS, and PC3 were associated with higher IAT volume (β range 1.22–1.41 mL/SD, all P © 2023 The Authors

关键词： Tissue

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Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b

arXiv

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arXiv 2023年

作者： A-Thano, Napaporn Awiphan, Supachai Jiang, Ing-Guey Kerins, eamonn Priyadarshi, Akshay McDonald, Iain Joshi, Yogesh C. Chulikorn, Thansuda Hayes, Joshua J.C. Charles, Stephen Huang, Chung-Kai Rattanamala, Ronnakrit Yeh, Li-Chin Dhillon, Vik S. Department of Physics Institute of Astronomy National Tsing-Hua University Hsinchu30013 Taiwan National Astronomical Research Institute of Thailand 260 Moo 4 Donkaew Mae Rim Chiang Mai50180 Thailand Jodrell Bank Centre for Astrophysics University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Department of Physical Sciences The Open University Walton Hall Milton KeynesMK7 6AA United Kingdom Manora Peak Nainital263001 India Department of Physics Faculty of Science Chulalongkorn University 254 Phayathai Road Pathumwan Bangkok10330 Thailand Institute of Astronomy and Astrophysics Academia Sinica No.1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan PhD Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Department of Physics and General Science Faculty of Science and Technology Nakhon Ratchasima Rajabhat University Nakhon Ratchasima30000 Thailand Institute of Computational and Modeling Science National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics and Astronomy University of Sheffield SheffieldS3 7RH United Kingdom Instituto de Astrofísica de Canarias Tenerife La LagunaE-38205 Spain

We present the transit timing variation (TTV) and planetary atmosphere analysis of the Neptune-mass planet HAT-P-26 b. We present a new set of 13 transit light curves from optical ground-based observations and combine them with light curves from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST), Transiting exoplanet Survey Satellite (TeSS), and previously published ground-based data. We refine the planetary parameters of HAT-P-26 b and undertake a TTV analysis using 33 transits obtained over seven years. The TTV analysis shows an amplitude signal of 1.98 ± 0.05 minutes, which could result from the presence of an additional ∼ 0.02 MJup planet at the 1:2 mean-motion resonance orbit. Using a combination of transit depths spanning optical to near-infrared wavelengths, we find that the atmosphere of HAT-P-26 b contains (formula presented) of H2O with a derived temperature of (formula presented) K. Copyright © 2023, The Authors. All rights reserved.

关键词： Timing circuits

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Transformative and sustainable insights of agricultural waste-based adsorbents for water defluoridation: Biosorption dynamics, economic viability, and spent adsorbent management

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Heliyon 2024年第8期10卷 e29747页

作者： Das, Koyeli Sukul, Uttara Chen, Jung-Sheng Sharma, Raju Kumar Banerjee, Pritam Dey, Gobinda Taharia, Md. Wijaya, Christian J. Lee, Cheng-I Wang, Shan-Li Nuong, Nguyen Hoang Kim Chen, Chien-Yen Department of Biomedical Sciences Graduate Institute of Molecular Biology National Chung Cheng University 168 University Road Min-Hsiung Chiayi County 62102 Taiwan Doctoral Program in Science Technology Environment and Mathematics Department of Earth and Environmental Sciences National Chung Cheng University 168 University Road Min-Hsiung Chiayi County 62102 Taiwan Department of Medical Research E-Da Hospital Kaohsiung 82445 Taiwan Department of Chemistry and Biochemistry National Chung Cheng University 168 University Road Min-Hsiung Chiayi County 62102 Taiwan Department of Chemical Engineering Widya Mandala Surabaya Catholic University Kalijudan 37 Surbaya 60114 Indonesia Collaborative Research Center for Zero Waste and Sustainability Kalijudan 37 Surabaya 60114 Indonesia Center for Nano Bio-Detection Center for Innovative Research on Aging Society AIM-HI National Chung Cheng University 168 University Road Min-Hsiung Chiayi County 62102 Taiwan Department of Agricultural Chemistry National Taiwan University Taipei 106319 Taiwan

With the progression of civilization, the harmony within nature has been disrupted, giving rise to various ecocidal activities that are evident in every spheres of the earth. These activities have had a profound and far-reaching impact on global health. One significant example of this is the presence of fluoride in groundwater exceeding acceptable limits, resulting in the widespread occurrence of “Fluorosis” worldwide. It is imperative to mitigate the concentration of fluoride in drinking water to meet safety standards. While various defluoridation techniques exist, they often have drawbacks. Biosorption, being a simple, affordable and eco-friendly method, has gained preference for defluoridation. However, its limited commercialization underscores the pressing need for further research in this domain. This comprehensive review article offers a thorough examination of the defluoridation potential of agro-based adsorbents, encompassing their specific chemical compositions and preparation methods. The review presents an in-depth discussion of the factors influencing fluoride biosorption and conducts a detailed exploration of adsorption isotherm and adsorption kinetic models to gain a comprehensive understanding of the nature of the adsorption process. Furthermore, it evaluates the commercial viability through an assessment of regeneration potential and a cost analysis of these agro-adsorbents, with the aim of facilitating the scalability of the defluoridation process. The elucidation of the adsorption mechanism and recommendations for overcoming challenges in large-scale implementation offer a comprehensive outlook on this eco-friendly and sustainable approach to fluoride removal. In summary, this review article equips readers with a lucid understanding of agro-adsorbents, elucidates their ideal conditions for improved performance, offers a more profound insight into the fluoride biosorption mechanism, and introduces the concept of effective spent adsorbent management.

关键词： Adsorption mechanism Agricultural waste Bio-sorption Cost analysis Defluoridation Regeneration Spent adsorbent management

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Alkali-Activated eco-Friendly Mixtures with Low-Processed Sugarcane Bagasse Ash—Physical, Mechanical, and Microstructural Properties

SSRN

引用

SSRN 2022年

作者： Lima, Victor estolano de estolano, Amanda Marques Lopes Almeida, Yeda Medeiros Bastos de Henrique, Mariana Alves Araújo, Fernanda Wanderley Corrêa de Melo Neto, Antonio Acacio de Federal University of Pernambuco Department of Civil and Environmental Engineering LabTag Av. da Arquitetura Recife Brazil Federal University of Pernambuco National Institute of Welding Technology and Coating of Materials INTM Rua da Inovação Recife Brazil Federal University of Pernambuco Institute for Petroleum and Energy Research LITPEG Petrochemical Laboratory Av. da Arquitetura Recife Brazil Federal University of Pernambuco Postgraduate Program in Materials Science Av. Jorn. Aníbal Fernandes Recife Brazil Federal Rural University of Pernambuco Department of Rural Technology Rua Cento e Sessenta e Três Cabo de Santo Agostinho Brazil

In this study, sugarcane bagasse ash was used to evaluate the physical, mechanical, and microstructural properties of eco-friendly alkali-activated mixtures with blast furnace slag. Net sodium silicate and solid metasilicate were used as activators to produce conventional and one-part alkali-activated mixtures, respectively. Two types of sugarcane bagasse ash were analyzed: raw (as-received) and calcined. The low number of proposed processes reduces the economic aggregate cost of recycled ash. Further, the blast furnace slag replacement ratios of raw and calcined sugarcane bagasse ash were 10%, 30%, 50%, and 70%. Mortars were prepared for the compressive and flexural strength tests, water absorption, and dry density. Alternatively, X-ray diffraction, thermogravimetry, infrared spectroscopy, and scanning electron microscopy were used to assess the chemical, mineralogical, and microstructural properties of the prepared pastes. In addition, the fresh test was performed using the flow table test, wherein the spread diameter decreased as the SBA content increased, primarily on the raw ash owing to its high organic material content. Moreover, compressive strength results showed that the compressive strength increased after 3 days for mixtures with 10% and 30% SBA. However, at 28 days, there was a decrease with an increase in the SBA content. Similar behavior was observed in the flexural strength and water absorption tests. Tests on pastes verified the probable presence of alternative phases besides C-(A)-S-H, such as pectolite, brucite, hydrotalcite, and zeolites. In addition, through the combination of scanning electron microscopy and energy dispersive spectroscopy techniques, the presence of preserved cellular structure was observed in the alkali-activated matrix, and Ca/Si and Si/Al ratios were calculated. It was concluded that the low reactivity of raw sugarcane bagasse ash and the low reactivity of both ashes significantly decreased mechanical performance. Furthermor

关键词： Slags

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A detailed time-resolved and energy-resolved spectro-polarimetric study of bright GRBs detected by AstroSat CZTI in its first year of operation

arXiv

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arXiv 2024年

作者： Gupta, Rahul Pandey, S.B. Gupta, S. Chattopadhayay, T. Bhattacharya, D. Bhalerao, V. Castro-Tirado, A.J. Valeev, A. Ror, A.K. Sharma, V. Racusin, J. Aryan, A. Iyyani, S. Vadawale, S. Astrophysics Science Division NASA Goddard Space Flight Center Mail Code 661 GreenbeltMD20771 United States NASA Postdoctoral Program Manora Peak Nainital263002 India Bhabha Atomic Research Center Maharashtra Mumbai400094 India Homi Bhabha National Institute Maharashtra Mumbai400094 India Kavli Institute of Particle Astrophysics and Cosmology Stanford University 452 Lomita Mall StanfordCA94305 United States Department of Physics Ashoka University Haryana Sonipat131029 India Indian Institute of Technology Bombay Powai Maharashtra Mumbai400076 India Glorieta de la Astronomía s/n GranadaE-18008 Spain Departamento de Ingeniería de Sistemas y Automática Escuela de Ingenierías Universidad de Málaga C. Dr. Ortiz Ramos sn MálagaE-29071 Spain Special Astrophysical Observatory of Russian Academy of Sciences Nizhniy Arkhyz Russia University of Maryland Baltimore County BaltimoreMD21250 United States Center for Research and Exploration in Space Science and Technology NASA/GSFC GreenbeltMD20771 United States Graduate Institute of Astronomy National Central University 300 Jhongda Road Jhongli32001 Taiwan Indian Institute of Science Education and Research Kerala Thiruvananthapuram695551 India Physical Research Laboratory Thaltej Gujarat Ahmedabad380009 India

The radiation mechanism underlying the prompt emission remains unresolved and can be resolved using a systematic and uniform time-resolved spectro-polarimetric study. In this paper, we investigated the spectral, temporal, and polarimetric characteristics of five bright GRBs using archival data from AstroSat CZTI, Swift BAT, and Fermi GBM. These bright GRBs were detected by CZTI in its first year of operation, and their average polarization characteristics have been published in Chattopadhyay et al. (2022). In the present work, we examined the time-resolved (in 100-600 keV) and energyresolved polarization measurements of these GRBs with an improved polarimetric technique such as increasing the effective area and bandwidth (by using data from low-gain pixels), using an improved event selection logic to reduce noise in the double events and extend the spectral bandwidth. In addition, we also separately carried out detailed time-resolved spectral analyses of these GRBs using empirical and physical synchrotron models. By these improved time-resolved and energy-resolved spectral and polarimetric studies (not fully coupled spectro-polarimetric fitting), we could pin down the elusive prompt emission mechanism of these GRBs. Our spectro-polarimetric analysis reveals that GRB 160623A, GRB 160703A, and GRB 160821A have Poynting flux-dominated jets. On the other hand, GRB 160325A and GRB 160802A have baryonic-dominated jets with mild magnetization. Furthermore, we observe a rapid change in polarization angle by ∼ 90 degrees within the main pulse of very bright GRB 160821A, consistent with our previous results. Our study suggests that the jet composition of GRBs may exhibit a wide range of magnetization, which can be revealed by utilizing spectro-polarimetric investigations of the bright GRBs. Copyright © 2024, The Authors. All rights reserved.

关键词： Polarimeters

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