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Sustainable design enhancement: An analysis on a new design of speedy chopper

AIP Conference Proceedings 2021年第1期2339卷

作者： M. S. M. Effendi Z. Shayfull H. Radhwan Mohd Azraie Mohd Azmi Shafeeq Ahmad Shamim Ahmad Muhammad Syahril Mohd Tahir Nur Ikhmal Naim Suhaimi Muhamad Hazimy Shah hisham Shah Abdul Jauwad Hashim Yagheswaren Iyasamy 1School of Manufacturing Engineering Universiti Malaysia Perlis Kampus Tetap Pauh Putra 02600 Arau Perlis Malaysia 2Green Design and Manufacture Research Group Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Universiti Malaysia Perlis 01000 Kangar Perlis Malaysia 3Universiti of Kuala Lumpur British Malaysia Institute (UniKL BMI) Batu 8 Jalan Sungai Pusu 53100 Gombak Selangor Darul Ehsan Malaysia 4Jache Sdn. Bhd. Lot 16 Admin Center Jalan Hi-Tech 2/7 Kulim Hi-Tech Park 09000 Kulim Kedah Malaysia

For this project, it is focused on redesign the original product and analysis of the product, which is the Speedy Chopper. The Speedy Chopper was inverted in the year 2015. The chopper is primarily used to mincing, mixing, whipping and prepare food for cooking purposes. Firstly, the objective of this project is same as the original product which is to make a tool that can chop food and vegetables, user-friendly operating, to save time when cutting the food and to reduce the usage of electricity. As a redesign, the original product is on the mechanism of the product where the original product is using the string that needs to pull several times to chop the input in the speedy chopper. So, the new design is using a rotating handle mechanism, and it is reducing the quantity of the part from the original product. Besides, engineering analysis will be conducted such as the product analysis, Failure Modes and Effects Analysis (FMEA), sustainability of the product and cost analysis before and after improvement of the product.

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Optimization of operating conditions of Lemon (Citrus aurantifolia) essential oil extraction by Hydro-distillation Process using Response Surface Methodology

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IOP Conference Series: Materials Science and engineering 2021年第1期1092卷

作者： T H Tran T N Q Nguyen X T Le H X Phong T B Long Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City 700000 Vietnam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam Department of Chemical Engineering HCMC University of Technology VNU-HCM Ho Chi Minh City Vietnam Biotechnology Research and Development Institute Can Tho University Can Tho City Vietnam College of Agriculture Can Tho University Can Tho City Vietnam

In this study, extraction of essential oils from the peels of lemon (Citrus aurantifolia) was conducted and optimized. Response Surface Methodology (RSM) was adopted to optimize four process parameters including the ratio of water and lemon peel (2:1 to 4:1 mL/g), extraction time (1 to 2 h) and extraction temperature (110 to 130 °C) to achieve maximal oil yield. The results showed a ratio of 3:1 (mL/g), extraction time of 1.6 hours, a temperature of 120 ºC produced an oil yield of 2.097%. In addition, GC-MS results revealed a total of 15 identified compounds in lemon essential oil with the major compound being Limonene, accounting for 66% of total content. The study applied surface response methodology to optimize the hydrodistillation conditions for extracting lemon essential oil. Application of this computer software is particularly advantageous in reducing the experiment number while producing reliable results.

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Water blanching conditions on the quality of green asparagus butt segment (Asparagus officinalis L.)

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Materials Today: Proceedings 2019年 18卷 4799-4809页

作者： Thi Van Linh Nguyen Tan Thanh Vo Tri Duc Lam Long Giang Bach Faculty of Chemical Engineering and Food Technology Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Centre of Excellence for Authenticity Risk Assessment and Technology of Food Nguyen Tat Thanh University Ho Chi Minh City Viet Nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

The butt segment of asparagus contains numerous nutrients, including various antioxidants. In particular, fibers and several mineral contents are quite high. However, asparagus butt segment quality is reduced in processing. Therefore, research on the asparagus butt segment processing for development of food industry and for the benefit of economic is necessary. Water blanching is a pretreatment method applied in most fruit and vegetable industry today. Water blanching process can inhibit enzyme activity and reduce loss of food quality. However, water blanching can lead to loss of nutrient contents as well as changes in color and texture (sensory values). In this study, the temperature was investigated at 70°C, 75°C, 80°C, 85°C, and 90°C, and the blanching time was observed at 2, 4, 6, and 8 minutes. We evaluated the effect of blanching conditions through the percent retention of vitamin C, phenolic compounds, antioxidant capacity (DPPH assay), and changes of sensory values. The results show that blanching temperatures from 75°C to 85°C insignificantly affect quality of asparagus butt segment. However, nutrient contents and sensory values decrease rapidly with the increase of blanching time. When asparagus was blanched at 85°C for 4 minutes, the percent retention of vitamin C, phenolic and antioxidant capacity was 74.84% 80.34% and 71.24%, respectively. These results suggested the good blanching conditions for asparagus butt segment processing..

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From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-Wind Binary Wolf-Rayet (WR) 140

arXiv

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arXiv 2023年

作者： Lau, Ryan M. Wang, Jason Hankins, Matthew J. Currie, Thayne Deo, Vincent Endo, Izumi Guyon, Olivier Han, Yinuo Jones, Anthony P. Jovanovic, Nemanja Lozi, Julien Moffat, Anthony F.J. Onaka, Takashi Ruane, Garreth Sander, Andreas A.C. Tinyanont, Samaporn Tuthill, Peter G. Weigelt, Gerd Williams, Peredur M. Vievard, Sebastien NSF’s NOIRLab 950 N. Cherry Ave. TucsonAZ85719 United States Institute of Space & Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Northwestern University 1800 Sherman Ave EvanstonIL60208 United States Department of Physical Sciences Arkansas Tech University 1701 N. Boulder Avenue RussellvilleAR72801 United States Subaru Telescope National Astronomical Observatory of Japan 650 North A‘ohoku Place HiloHI96720 United States Department of Astronomy School of Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Steward Observatory University of Arizona TucsonAZ85721 United States Astrobiology Center of NINS 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Institut d’Astrophysique Spatiale CNRS Univ. Paris-Sud Université Paris-Saclay Bât. 121 OrsayCedex 91405 France Department of Astronomy California Institute of Technology PasadenaCA91125 United States Département de Physique Université de Montréal C.P. 6128 succ. centre-ville MontréalQCH3C 3J7 Canada Centre de Recherche en Astrophysique du Québec Canada Department of Physics Faculty of Science and Engineering Meisei University 2-1-1 Hodokubo Hino Tokyo191-8506 Japan Zentrum für Astronomie der Universität Heidelberg Astronomisches Rechen-Institut Mönchhofstr. 12-14 Heidelberg69120 Germany Department of Astronomy and Astrophysics University of California 1156 High St. Santa CruzCA95064 United States School of Physics The University of Sydney NSW2006 Australia Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn53121 Germany Institute for Astronomy University of Edinburgh Royal Observatory EdinburghEH9 3HJ United Kingdom

Wolf-Rayet (WR) 140 is the archetypal periodic dust-forming colliding-wind binary that hosts a carbon-rich WR (WC) star and an O-star companion with an orbital period of 7.93 years and an orbital eccentricity of 0.9. Throughout the past several decades, multiple dust-formation episodes from WR 140 have been observed that are linked to the binary orbit and occur near the time of periastron passage. Given its predictable dust-formation episodes, WR 140 presents an ideal astrophysical laboratory for investigating the formation and evolution of dust in the hostile environment around a massive binary system. In this paper, we present near- and mid-infrared (IR) spectroscopic and imaging observations of WR 140 with Subaru/SCExAO+CHARIS, Keck/NIRC2+PyWFS, and Subaru/COMICS taken between 2020 June and Sept that resolve the circumstellar dust emission linked to its most recent dust-formation episode in 2016 Dec. Our spectral energy distribution (SED) analysis of WR 140’s resolved circumstellar dust emission reveals the presence of a hot (Td ∼ 1000 K) near-IR dust component that is co-spatial with the previously known and cooler (Td ∼ 500 K) mid-IR dust component composed of 300–500 Å-sized dust grains. We attribute the hot near-IR dust emission to the presence of nano-sized ("nanodust") grains and suggest they were formed from grain-grain collisions or the rotational disruption of the larger grain size population by radiative torques in the strong radiation field from the central binary. Lastly, we speculate on the astrophysical implications of nanodust formation around colliding-wind WC binaries, which may present an early source of carbonaceous nanodust in the interstellar medium. © 2023, CC BY.

关键词： Dust

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The effect of Roselle calyces extract on the chemical and sensory properties of cupcakes

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IOP Conference Series: Materials Science and engineering 2020年第6期736卷

作者： V T Thanh Nhi Y T Tran N T V Linh Tran Anh Vy Tran Thanh Truc NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam Faculty of Chemical Engineering and Food Technology Nguyen Tat Thanh University Ho Chi Minh City Vietnam Department of Chemical and Biochemical Engineering Gachon University South Korea College of Agriculture Can Tho University Vietnam

Roselle calyces (RC) are a valuable crop for export and manufacture of a typical drink in Vietnam. The RC is widely applied as a natural colorant in different fields such as food and pharmaceutical industries. The objective of this research was to determine the effect of extraction parameters on the nutritional value and sensibility of cupcake added with RC. Examined indicators included lipid, moisture, pH, protein, and ash. Moreover, the sensory properties of cupcakes formulated with Roselle calyces extract were also determined. Compared with the control cupcake, the RC-added cupcake exhibited higher content of moisture, protein, and ascorbic acid, achieving 30.16 ± 0.25, 2.76 ± 0.07 and 37.65 ± 0.64 respectively. In contrast, the level of pH, ash, and lipid experienced a marginal drop, achieving 7.02 ± 0.25, 1.05 ± 0.13 and 14.78 ± 1.01 respectively. Moreover, the Roselle cupcake had 3.74 ± 0.02 mg/L anthocyanin content. The percentage of retention of anthocyanin content at 180°C for 20 minutes was 60.53 ± 0.48. RC cupcakes have high sensory scores (P<0.05) comparing with control RC cupcakes. RC cupcake can be a functional food which has a cost- effective advantage.

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Research On Control Of Precast Alignment Of Short-line Method Precast Segmental Concrete Bridges Based On The Theory Of Four-point Distance

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IOP Conference Series: Earth and Environmental Science 2020年第5期510卷

作者： Tiedong Qi Qin Yuan Jinbao Guan Dianyuan Liu Xiaolei Wang Research Institute of Highway Ministry of Transport Beijing 100088 China China Road Transport Inspection & Certification Hi-tech Co. Ltd Beijing 100088 China CCCC Second Highway Consultants Co. Ltd Wuhan 430052 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin 150090 China

The short-line precast segmental concrete bridge is a concrete bridge which assembles the concrete segments made in advance by the factory through reliable connection, the key of its construction is the linear control in the prefabrication stage, generally, six point coordinate control system is used in cooperation with total station. In this paper, a new four-point distance control system is proposed to coordinate with the level gauge and steel tape for the linear control in the prefabrication stage, which has the advantages of high efficiency, simple operation and no need of measuring tower and target tower, etc. It has been successfully applied in the prefabrication stage of the main beam of the non navigable span bridge of Yueqingwan bridge, which can be used for reference in related projects.

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Benchmarking the design of the cryogenics system for the underground argon in DarkSide-20k

arXiv

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arXiv 2024年

作者： Acerbi, F. Adhikari, P. Agnes, P. Ahmad, I. Albergo, S. Albuquerque, I.F.M. Alexander, T. Alton, A.K. Amaudruz, P. Angiolilli, M. Aprile, E. Ardito, R. Corona, M. Atzori Auty, D.J. Ave, M. Avetisov, I.C. Azzolini, O. Back, H.O. Balmforth, Z. Olmedo, A. Barrado Barrillon, P. Batignani, G. Bhowmick, P. Blua, S. Bocci, V. Bonivento, W. Bottino, B. Boulay, M.G. Buchowicz, A. Bussino, S. Busto, J. Cadeddu, M. Cadoni, M. Calabrese, R. Camillo, V. Caminata, A. Canci, N. Capra, A. Caravati, M. Cárdenas-Montes, M. Cargioli, N. Carlini, M. Castellani, A. Castello, P. Cavalcante, P. Cebrian, S. Ruiz, J. Cela Chashin, S. Chepurnov, A. Cifarelli, L. Cintas, D. Citterio, M. Cleveland, B. Coadou, Y. Cocco, V. Colaiuda, D. Vilda, E. Conde Consiglio, L. Costa, B.S. Czubak, M. D’Aniello, M. D’Auria, S. Da Rocha Rolo, M.D. Darbo, G. Davini, S. De Cecco, S. De Guido, G. Dellacasa, G. Derbin, A.V. Devoto, A. Di Capua, F. Di Ludovico, A. Di Noto, L. Di Stefano, P. Dias, L.K. Mairena, D. Díaz Ding, X. Dionisi, C. Dolganov, G. Dordei, F. Dronik, V. Elersich, A. Ellingwood, E. Erjavec, T. Diaz, M. Fernandez Ficorella, A. Fiorillo, G. Franchini, P. Franco, D. Gatti, H. Frandini Frolov, E. Gabriele, F. Gahan, D. Galbiati, C. Galiński, G. Gallina, G. Gallus, G. Garbini, M. Abia, P. Garcia Gawdzik, A. Gendotti, A. Ghisi, A. Giovanetti, G.K. Casanueva, V. Goicoechea Gola, A. Grandi, L. Grauso, G. di Cortona, G. Grilli Grobov, A. Gromov, M. Guerzoni, M. Gulino, M. Guo, C. Hackett, B.R. Hallin, A. Hamer, A. Haranczyk, M. Harrop, B. Hessel, T. hill, S. Horikawa, S. Hu, J. Hubaut, F. Hucker, J. Hugues, T. Hungerford, E.V. Ianni, A. Ippolito, V. Jamil, A. Jillings, C. Jois, S. Kachru, P. Keloth, R. Kemmerich, N. Kemp, A. Kendziora, C.L. Kimura, M. Kish, A. Kondo, K. Korga, G. Kotsiopoulou, L. Koulosousas, S. Kubankin, A. Kunzé, P. Kuss, M. Kuźniak, M. Kuzwa, M. La Commara, M. Lai, M. Le Guirriec, E. Leason, E. Leoni, A. Lidey, L. Lissia, M. Fondazione Bruno Kessler Povo38123 Italy Department of Physics Carleton University OttawaONK1S 5B6 Canada Gran Sasso Science Institute L’Aquila67100 Italy INFN Laboratori Nazionali del Gran Sasso AQ Assergi67100 Italy AstroCeNT Nicolaus Copernicus Astronomical Center the Polish Academy of Sciences Warsaw00-614 Poland INFN Catania Catania95121 Italy Università of Catania Catania95124 Italy Instituto de Física Universidade de São Paulo São Paulo05508-090 Brazil Pacific Northwest National Laboratory RichlandWA99352 United States Physics Department Augustana University Sioux FallsSD57197 United States TRIUMF 4004 Wesbrook Mall VancouverBCV6T 2A3 Canada Physics Department Columbia University New YorkNY10027 United States Civil and Environmental Engineering Department Politecnico di Milano Milano20133 Italy INFN Milano Milano20133 Italy INFN Cagliari Cagliari09042 Italy Physics Department Università degli Studi di Cagliari Cagliari09042 Italy Department of Physics University of Alberta EdmontonABT6G 2R3 Canada Mendeleev University of Chemical Technology Moscow125047 Russia INFN Laboratori Nazionali di Legnaro Padova Legnaro35020 Italy Savannah River National Laboratory JacksonSC29831 United States Department of Physics Royal Holloway University of London EghamTW20 0EX United Kingdom CIEMAT Centro de Investigaciones Energéticas Medioambientales y Tecnológicas Madrid28040 Spain Centre de Physique des Particules de Marseille Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Physics Department Università degli Studi di Pisa Pisa56127 Italy INFN Pisa Pisa56127 Italy University of Oxford OxfordOX1 2JD United Kingdom INFN Torino Torino10125 Italy Department of Electronics and Communications Politecnico di Torino Torino10129 Italy INFN Sezione di Roma Roma00185 Italy Physics Department Università degli Studi di Genova Genova16146 Italy INFN Genova Genova16146 Italy Institute of Radioelectronics and Multime

DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ∼100 t of low radioactivity argon from an underground source (UAr) in its inner detector, with half serving as target in a dual-phase time projection chamber (TPC). The UAr cryogenics system must maintain stable thermodynamic conditions throughout the experiment’s lifetime of over 10 years. Continuous removal of impurities and radon from the UAr is essential for maximising signal yield and mitigating background. We are developing an efficient and powerful cryogenics system with a gas purification loop with a target circulation rate of 1000 slpm. Central to its design is a condenser operated with liquid nitrogen which is paired with a gas heat exchanger cascade, delivering a combined cooling power of more than 8 kW. Here we present the design choices in view of the DS-20k requirements, in particular the condenser’s working principle and the cooling control, and we show test results obtained with a dedicated benchmarking platform at CERN and LNGS. We find that the thermal efficiency of the recirculation loop, defined in terms of nitrogen consumption per argon flow rate, is 95 % and the pressure in the test cryostat can be maintained within ±(0.1 − 0.2) mbar. We further detail a 5-day cool-down procedure of the test cryostat, maintaining a cooling rate typically within −2 K/h, as required for the DS-20k inner detector. Additionally, we assess the circuit’s flow resistance, and the heat transfer capabilities of two heat exchanger geometries for argon phase change, used to provide gas for recirculation. We conclude by discussing how our findings influence the finalisation of the system design, including necessary modifications to meet requirements and ongoing testing activities. Copyright © 2024, The Authors. All rights reserved.

关键词： Dark Matter

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DarkSide-20k sensitivity to light dark matter particles

arXiv

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arXiv 2024年

作者： Acerbi, F. Adhikari, P. Agnes, P. Ahmad, I. Albergo, S. Albuquerque, I.F.M. Alexander, T. Alton, A.K. Amaudruz, P. Angiolilli, M. Aprile, E. Ardito, R. Corona, M. Atzori Auty, D.J. Ave, M. Avetisov, I.C. Azzolini, O. Back, H.O. Balmforth, Z. Olmedo, A. Barrado Barrillon, P. Batignani, G. Bhowmick, P. Blua, S. Bocci, V. Bonivento, W. Bottino, B. Boulay, M.G. Buchowicz, A. Bussino, S. Busto, J. Cadeddu, M. Cadoni, M. Calabrese, R. Camillo, V. Caminata, A. Canci, N. Capra, A. Caravati, M. Cárdenas-Montes, M. Cargioli, N. Carlini, M. Castellani, A. Castello, P. Cavalcante, P. Cebrian, S. Ruiz, J.M. Cela Chashin, S. Chepurnov, A. Cifarelli, L. Cintas, D. Citterio, M. Cleveland, B. Coadou, Y. Cocco, V. Colaiuda, D. Vilda, E. Conde Consiglio, L. Costa, B.S. Czubak, M. D’Aniello, M. D’Auria, S. Da Rocha Rolo, M.D. Darbo, G. Davini, S. De Cecco, S. De Guido, G. Dellacasa, G. Derbin, A.V. Devoto, A. Di Capua, F. Di Ludovico, A. Di Noto, L. Di Stefano, P. Dias, L.K. Mairena, D. Díaz Ding, X. Dionisi, C. Dolganov, G. Dordei, F. Dronik, V. Elersich, A. Ellingwood, E. Erjavec, T. Diaz, M. Fernandez Ficorella, A. Fiorillo, G. Franchini, P. Franco, D. Gatti, H. Frandini Frolov, E. Gabriele, F. Gahan, D. Galbiati, C. Galin´ski, G. Gallina, G. Gallus, G. Garbini, M. Abia, P. Garcia Gawdzik, A. Gendotti, A. Ghisi, A. Giovanetti, G.K. Casanueva, V. Goicoechea Gola, A. Grandi, L. Grauso, G. di Cortona, G. Grilli Grobov, A. Gromov, M. Guerzoni, M. Gulino, M. Guo, C. Hackett, B.R. Hallin, A. Hamer, A. Haranczyk, M. Harrop, B. Hessel, T. hill, S. Horikawa, S. Hu, J. Hubaut, F. Hucker, J. Hugues, T. Hungerford, E.V. Ianni, A. Ippolito, V. Jamil, A. Jillings, C. Jois, S. Kachru, P. Keloth, R. Kemmerich, N. Kemp, A. Kendziora, C.L. Kimura, M. Kondo, K. Korga, G. Kotsiopoulou, L. Koulosousas, S. Kubankin, A. Kunzé, P. Kuss, M. Kuz´niak, M. Kuzwa, M. La Commara, M. Lai, M. Le Guirriec, E. Leason, E. Leoni, A. Lidey, L. Lissia, M. Luzzi, L. Fondazione Bruno Kessler Povo38123 Italy Department of Physics Carleton University OttawaONK1S 5B6 Canada Gran Sasso Science Institute L’Aquila67100 Italy INFN Laboratori Nazionali del Gran Sasso AQ Assergi67100 Italy AstroCeNT Nicolaus Copernicus Astronomical Center The Polish Academy of Sciences Warsaw00-614 Poland INFN Catania Catania95121 Italy Università of Catania Catania95124 Italy Instituto de Física Universidade de São Paulo São Paulo05508-090 Brazil Pacific Northwest National Laboratory RichlandWA99352 United States Physics Department Augustana University Sioux FallsSD57197 United States TRIUMF 4004 Wesbrook Mall VancouverBCV6T 2A3 Canada Physics Department Columbia University New YorkNY10027 United States Civil and Environmental Engineering Department Politecnico di Milano Milano20133 Italy INFN Milano Milano20133 Italy INFN Cagliari Cagliari09042 Italy Physics Department Università degli Studi di Cagliari Cagliari09042 Italy Department of Physics University of Alberta EdmontonABT6G 2R3 Canada Mendeleev University of Chemical Technology Moscow125047 Russia INFN Laboratori Nazionali di Legnaro Legnaro Padova35020 Italy Savannah River National Laboratory JacksonSC29831 United States Department of Physics Royal Holloway University of London EghamTW20 0EX United Kingdom CIEMAT Centro de Investigaciones Energéticas Medioambientales y Tecnológicas Madrid28040 Spain Centre de Physique des Particules de Marseille Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Physics Department Università degli Studi di Pisa Pisa56127 Italy INFN Pisa Pisa56127 Italy University of Oxford OxfordOX1 2JD United Kingdom INFN Torino Torino10125 Italy Department of Electronics and Communications Politecnico di Torino Torino10129 Italy INFN Sezione di Roma Roma00185 Italy Physics Department Università degli Studi di Genova Genova16146 Italy INFN Genova Genova16146 Italy Institute of Radioelectronics and Multi

The dual-phase liquid argon time projection chamber is presently one of the leading technologies to search for dark matter particles with masses below 10 GeV/c2. This was demonstrated by the DarkSide-50 experiment with approximately 50 kg of low-radioactivity liquid argon as target material. The next generation experiment DarkSide-20k, currently under construction, will use 1,000 times more argon and is expected to start operation in 2027. Based on the DarkSide-50 experience, here we assess the DarkSide-20k sensitivity to models predicting light dark matter particles, including Weakly Interacting Massive Particles (WIMPs) and sub-GeV/c2 particles interacting with electrons in argon atoms. With one year of data, a sensitivity improvement to dark matter interaction cross-sections by at least one order of magnitude with respect to DarkSide-50 is expected for all these models. A sensitivity to WIMP–nucleon interaction cross-sections below 1 × 10−42 cm2 is achievable for WIMP masses above 800 MeV/c2. With 10 years exposure, the neutrino fog can be reached for WIMP masses around 5 GeV/c2 © 2024, CC BY.

关键词： Germanium alloys

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Observation of high-Frequency Transverse Phonons in Metallic Glasses

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Physical Review Letters 2020年第22期124卷 225902-225902页

作者： X. Y. Li H. P. Zhang S. Lan D. L. Abernathy T. Otomo F. W. Wang Y. Ren M. Z. Li X.-L. Wang Department of Physics City University of Hong Kong 83 Tat Chee Avenue Hong Kong China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 101408 China Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of China Beijing 100872 China Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology 200 Xiaolingwei Avenue Nanjing 210094 China Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Songshan Lake Materials Laboratory Dongguan 523808 China X-ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute 8 Yuexing 1st Road Shenzhen Hi-Tech Industrial Park Shenzhen 518057 China

Using inelastic neutron scattering and molecular dynamics simulations on a model Zr-Cu-Al metallic glass, we show that transverse phonons persist well into the high-frequency regime, and can be detected at large momentum transfer. Furthermore, the apparent peak width of the transverse phonons was found to follow the static structure factor. The one-to-one correspondence, which was demonstrated for both Zr-Cu-Al metallic glass and a three-dimensional Lennard-Jones model glass, suggests a universal correlation between the phonon dynamics and the underlying disordered structure. This remarkable correlation, not found for longitudinal phonons, underscores the key role that transverse phonons hold for understanding the structure-dynamics relationship in disordered materials.

关键词： Acoustic phonons Phonons Metallic glasses

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Extraction conditions of Polyphenol, Flavonoid compounds with Antioxidant activity from Veronia amygdalina Del. Leaves: Modeling and optimization of the process using the response surface methodology RSM

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Materials Today: Proceedings 2019年 18卷 4004-4010页

作者： Chung Duong Dinh Yen Nguyen Thi Ngoc Duc Lam Tri Quan Nguyen Huu Khanh Duy Chinh Nguyen Long Giang Bach Faculty of Pharmacy Nguyen Tat Thanh University Ho Chi Minh City Viet nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet nam Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City Viet nam Faculty of Chemical Engineering and Food Technology Nguyen Tat Thanh University Ho Chi Minh City Viet nam

This study aims to determine optimal conditions for extraction of phenolic compounds with maximum antioxidant activity from Vernonia amygdalina Del. leaves using Response Surface Methodology and Central Composite Design (RSM-CCD). Results showed that extracting time, temperature and solvent to material ratio had a significant effect on phenolic content (p < 0.001). The interactions between the three factors were also found to be significant at 95% confidence level. The polyphenol content was 137.15 ± 1.36 mg gallic acid /g dry weight (dw), the flavonoid content was 96.78 ± 1.39 mg quercetin/g dw, the total antioxidant activity was 1.95 ± 0.09 mg ascorbic acid/g dw and iron reduction activity was 5.90 ± 0.12 mg FeSO4/g dw at optimum conditions of 34.82 hours at 53.09°C with solvent to material ratio is 43.64 (ml /g). The determination coefficients of all models was greater than 0.995 suggesting that the regression model can represent the experimental data well.

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