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arXiv 2019年

作者： Tu, Xiaoguang Zhang, Hengsheng Xie, Mei Luo, Yao Zhang, Yuefei Ma, Zheng No.2006 Xiyuan Ave West Hi-Tech Zone Chengdu Sichuan611731 China School of Communication and Information Engineering University of Electronic Science and Technology of China Chongqing Institute of Public Security Science and Technology

Spatio-temporal information is very important to capture the discriminative cues between genuine and fake faces from video sequences. To explore such a temporal feature, the fine-grained motions (e.g., eye blinking, mouth movements and head swing) across video frames are very critical. In this paper, we propose a joint CNN-LSTM network for face anti-spoofing, focusing on the motion cues across video frames. We first extract the high discriminative features of video frames using the conventional Convolutional Neural Network (CNN). Then we leverage Long Short-Term Memory (LSTM) with the extracted features as inputs to capture the temporal dynamics in videos. To ensure the fine-grained motions more easily to be perceived in the training process, the eulerian motion magnification is used as the preprocessing to enhance the facial expressions exhibited by individuals, and the attention mechanism is embedded in LSTM to ensure the model learn to focus selectively on the dynamic frames across the video clips. Experiments on Replay Attack and MSU-MFSD databases show that the proposed method yields state-of-the-art performance with better generalization ability compared with several other popular algorithms. Copyright © 2019, The Authors. All rights reserved.

关键词： Long short-term memory

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Solar tracking for optimizing conversion efficiency using ANN 6th

Solar tracking for optimizing conversion efficiency using AN...

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6th International Conference on Frontiers of Intelligent Computing: Theory and Applications, FICTA-2017

作者： Singh, Neeraj Kumar Badge, Shilpa S. Salimath, Gangadharayya F. Department of Electrical Engineering PES College of Engineering AurangabadMaharashtra431004 India Department of Electronics and Telecommunication Engineering Hi-Tech Institute of Technology AurangabadMaharashtra431005 India Department of Electrical Engineering Shreeyash College of Engineering and Technology AurangabadMaharashtra431004 India

ISBN: (纸本)9789811075650

In order to maximize the amount of radiation collected by a solar PV panel, the tracker must follow the sun throughout the day. The tracking mechanism of sun required electric motors, light sensors, gearbox, and electronic control to accurately focus at the sun at all times which make the tracking system complex. Also to get maximum power from solar PV panel, MPPT technique must be implemented to the system. This paper deals with new approach for solar tracking and MPPT using single neural network control scheme aiming to reduce overall cost and complexity without nixing efficiency of solar photovoltaic system. The simulation model is done in the MATLAB Simulink for system analysis. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Neural networks

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The mechanism of action of T-705 as a unique delayed chain terminator on influenza viral polymerase transcription

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Biophysical Chemistry 2021年 277卷 106652-106652页

作者： Wang, Yuqing Yuan, Congmin Xu, Xinzhou Chong, Tin Hang Zhang, Lu Cheung, Peter Pak-Hang Huang, Xuhui The Hong Kong University of Science and Technology-Shenzhen Research Institute Hi-Tech Park Nanshan Shenzhen 518057 China Bioengineering Graduate Program Department of Biological and Chemical Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong Department of Chemistry State Key Laboratory of Molecular Neuroscience The Hong Kong University of Science and Technology Kowloon Hong Kong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 Fujian China University of Chinese Academy of Sciences Beijing 100049 China Department of Chemical Pathology The Chinese University of Hong Kong Prince of Wales Hospital Shatin New Territories Hong Kong Li Ka Shing Institute of Health Sciences Li Ka Shing Medical Sciences Building The Chinese University of Hong Kong Shatin New Territories Hong Kong

Favipiravir (T-705) has been developed as a potent anti-influenza drug and exhibited a strong inhibition effect against a broad spectrum of RNA viruses. Its active form, ribofuranosyl-triphosphate (T-705-RTP), functions as a competitive substrate for the RNA-dependent RNA polymerase (RdRp) of the influenza A virus (IAV). However, the exact inhibitory mechanisms of T-705 remain elusive and subject to a long-standing debate. Although T-705 has been proposed to inhibit transcription by acting as a chain terminator, it is also paradoxically suggested to be a mutagen towards IAV RdRp by inducing mutations due to its ambiguous base pairing of C and U. Here, we combined biochemical assay with molecular dynamics (MD) simulations to elucidate the molecular mechanism underlying the inhibitory functions exerted by T-705 in IAV RdRp. Our in vitro transcription assay illustrated that IAV RdRp could recognize T-705 as a purine analogue and incorporate it into the nascent RNA strand. Incorporating a single T-705 is incapable of inhibiting transcription as extra natural nucleotides can be progressively added. However, when two consecutive T-705 are incorporated, viral transcription is completely terminated. MD simulations reveal that the sequential appearance of two T-705 in the nascent strand destabilizes the active site and disrupts the base stacking of the nascent RNA. Altogether, our results provide a plausible explanation for the inhibitory roles of T-705 targeting IAV RdRp by integrating the computational and experimental methods. Our study also offers a comprehensive platform to investigate the inhibition effect of antivirals and a novel explanation for the designing of anti-flu drugs. © 2021

关键词： Chain terminator Influenza Mutagen RNA polymerase T-705

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An enzyme-assisted method to extract vetiver ( Vetiveria zizanioides L.) essential oil

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Materials Today: Proceedings 2023年

作者： Xuan-Tien Le Duc-Phuong Vu Thu-Thuy Nguyen-Thi Tuong-An Tran-Thi Minh-Tam Nguyen-Kim Thanh Ngoc Nguyen Department of Chemical Engineering Ho Chi Minh City University of Technology (HCMUT) 268 Ly Thuong Kiet Street Ward 14 District 10 Ho Chi Minh City 700000 Vietnam Vietnam National University Ho Chi Minh City (VNU-HCM) Ho Chi Minh City 700000 Vietnam NTT Hi-Tech Institute Nguyen Tat Thanh University 300A Nguyen Tat Thanh Street Ward 13 District 4 Ho Chi Minh City 700000 Vietnam

Vetiver ( Vetiveria zizanioides (L.) Nash) has various applications in many different fields, such as agriculture, medicine, etc. However, the traditional long vetiver essential oil (VEO) extraction process consumes a lot of energy. Therefore, this study is directed to the use of enzymes to support the VEO distillation. According to the results, the pretreated vetiver root with viscozyme was highly applicable as the extraction yield was enhanced by 23% and the extraction time was decreased by 10 h compared to the traditional method. The pretreatment conditions were surveyed to enhance the effectiveness of the viscozyme pretreatment. By using GC–MS, 63 active ingredients were identified and semi-quantified in hydrodistillation extracted VEO, accounting for about 84.72% of the total essential oil content obtained. The GC–MS results show that there was no significant difference between the non-enzyme-assisted and the viscozyme pretreatment samples.

关键词： Distillation process Enzyme-assisted Essential oil extraction Vetiver essential oil

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Water blanching conditions on the quality of green asparagus butt segment (Asparagus officinalis L.) 9

Water blanching conditions on the quality of green asparagus...

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9th International Conference of Materials Processing and Characterization, ICMPC 2019

作者： Nguyen, Thi Van Linh Vo, Thanh Lam, Tri Duc Bach, Long Giang 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 900C, 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. © 2019 Elsevier Ltd. All rights reserved.

关键词： Blanching

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Implementation of DFMA and FEA method as a combination approach in sustainable design: A case study of hair dryer design

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AIP Conference Proceedings 2021年第1期2339卷 020177页

作者： M. S. M. Effendi Z. Shayfull H. Radhwan Muhammad Ghazali Abdul Rahman Shafeeq Ahmad Shamim Ahmad Muhammad Azam Asri Nur Syahirah Mohd Tamizi Nur Adila Mohd Haris Siti Aminah Zawawi School of Manufacturing Engineering Universiti Malaysia Perlis Kampus Tetap Pauh Putra 02600 Arau Perlis Malaysia Green Design and Manufacture Research Group Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Universiti Malaysia Perlis 01000 Kangar Perlis Malaysia Electronics Technology Section Universiti Kuala Lumpur British Malaysian Institute 53100 Selangor Malaysia Jache Sdn. Bhd. Lot 16 Admin Center Jalan Hi-Tech 2/7 Kulim Hi-Tech Park 09000 Kulim Kedah Malaysia

This study aims to analyse the components of the hairdryer to 1ecogniz the quantities or improvements in the features of the components involved, and it is necessary to study possible sustainable design improvements. Thus, it is implementing Design for Manufacturing (DFMA) and Life Cycle Analysis (LCA) approach to assist sustainability analysis. The results from a product survey of consumers found that 75% of consumers are from women while the rest are men who use hair dryers. Therefore, people in the 18-30 years old prefer to use the hairdryer when while 18.8% of users often keep the hair dryer on the makeup table and 12.5% of users keep the makeup drawer to look neat. While the results of sustainability study on hair dryer products have found that before analysis using PP Copolymer material there was a good impact on the product analysis in terms of Material Unit Cost of 2.80 USD / kg compared to previous use of ABS material of 2.90 USD / kg. While in terms of Material Financial Impact from the use of PP Copolymer there was a decrease of 0.20 USD compared to material abs usage of 1752.00 USD. In terms of weight the hairdryer has also experienced a weight reduction of 70.05 g to 60.04 g. But in terms of duration of use still the same period of the application for a year and also in term transportation still remain the same as truck distance 1600 km. The surface area of the product also decreased from 76268.30 mm² to 74199.49 mm². The methods used for hair dryer production are finite element analysis and sustainability analysis.

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Chemical constituents of the aerial parts of scoparia dulcis and anti-cancer, anti-inflammatory activities 8th

Chemical constituents of the aerial parts of scoparia dulcis...

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8th International Conference on Advanced Materials and engineering Materials, ICAMEM 2019

作者： Tin, Nguyen Ngoc Thanh Truc, Nguyen Dang Thanh Hang, Hoang Thi Thu Trinh, Pham Thi Nhat Bach, Long Giang Dung, Le Tien Nguyen Thong High School Vinh Long Province Viet Nam Faculty of Natural Sciences Tien Giang University Tien Giang Province Viet Nam NTT Hi-Tech Institute 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 Institute of Applied Materials Science Vietnam Academy of Science and Techno logy Ho Chi Minh City Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology Ha Noi Viet Nam

ISBN: (纸本)9783035714883

In Vietnam, the medicinal plant Scoparia dulcis is used for the treatment of bronchitis, gastric disorders, antidiabetes, hypertension, hepatitis etc.1 In this paper, experiments was designed to evaluate in vitro anticancer and anti-inflammatory activities and isolate phytochemicals from methanol extracts of Scoparia dulcis whole plants. The chemical investigation of methanol fraction of Scoparia dulcis led to the isolation of benzoxazinone (1), phenylethanoid (2), flavone (3), and lignan (4) glycosides. The bioactivity results indicated that crude ethanol and ethyl acetate extracts had potent cytotoxic activity toward the HepG2 cancer cell with IC50 of 47.03 µg/mL and 36.04 µg/mL, respectively. Interestingly, crude ethanol and ethyl acetate extracts had the NO inhibitory activity, with inhibition of 56.9 % or 74.7 % at 30 µg/mL and 97.3% or 82.9 % at 100 µg/mL, respectively. In addition, the hexane extract at concentrations of 100 µg/ml demonstrated anti-inflammatory activity through the inhibition of nitric oxide production of 76.7%. © 2019 Trans tech Publications Ltd, Switzerland.

关键词： Ethanol

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Novel Quinolizine AIE System: Visualization of Molecular Motion and Elaborate Tailoring for Biological Application**

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Angewandte Chemie 2022年第11期134卷

作者： Dr. Benzhao He Dr. Jiachang Huang Mr. Jianyu Zhang Dr. Herman H. Y. Sung Dr. Jacky W. Y. Lam Dr. Zhijun Zhang Dr. Saisai Yan Prof. Dong Wang Prof. Jing Zhang Prof. Ben Zhong Tang Center for Advanced Materials Research Science and Technology Experimental Platform Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai Zhuhai 519085 China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science & Technology Clear Water Bay Kowloon Hong Kong China HKUST-Shenzhen Research Institute No. 9 Yuexing 1st RD South Area Hi-tech Park Nanshan Shenzhen 518057 China Center for AIE Research College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China Department of Laboratory Medicine Nanfang Hospital Southern Medical University Guangzhou 510515 China Shenzhen Institute of Aggregate Science and Technology School of Science and Engineering The Chinese University of Hong Kong 2001 Longxiang Boulevard Longgang District Shenzhen 518172 China

Molecular motions are ubiquitous in nature and they immutably play intrinsic roles in all actions. However, exploring appropriate models to decipher molecular motions is an extremely important but very challenging task for researchers. Considering aggregation-induced emission (AIE) luminogens possess their unique merits to visualize molecular motions, it is particularly fascinating to construct new AIE systems as models to study molecular motion. Herein, a novel quinolizine (QLZ) AIE system was constructed based on the restriction intramolecular vibration (RIV) mechanism. It was demonstrated that QLZ could act as an ideal model to visualize single-molecule motion and macroscopic molecular motion via fluorescence change. Additionally, further elaborate tailoring of this impressive core achieved highly efficient reactive oxygen species production and realized fluorescence imaging-guided photodynamic therapy applications, which confirms the great application potential of this new AIE-active QLZ core. Therefore, this work not only provides an ideal model to visualize molecular motion but also opens a new way for the application of AIEgens.

关键词： Molecular Motion Aggregation-Induced Emission Quinolizine Photodynamic Therapy

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A re-evaluation of the Chaetothyriales using criteria of comparative biology

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Fungal Diversity 2020年第4期103卷 47-85页

作者： Yu Quan Lucia Muggia Leandro F.Moreno Meizhu Wang Abdullah M.S.Al-Hatmi Nickolas da Silva Menezes Dongmei Shi Shuwen Deng Sarah Ahmed Kevin D.Hyde Vania A.Vicente Yingqian Kang JBenjamin Stielow Sybren de Hoog Centre of Expertise in Mycology of Radboud University Medical Centre/Canisius Wilhelmina Hospital NijmegenThe Netherlands Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education of Guizhou&Key Laboratory of Medical Microbiology and ParasitologySchool of Basic Medical SciencesGuizhou Medical UniversityGuiyangChina College of Food and Pharmaceutical Engineering Guizhou Institute of TechnologyGuiyangChina Department of Life Sciences University of TriesteTriesteItaly Amsterdam Medical Center AmsterdamThe Netherlands Foundation Atlas of Clinical Fungi HilversumThe Netherlands Ministry of Health Directorate General of Health ServicesIbriOman Postgraduate Program in Microbiology Parasitology and PathologyBiological SciencesDepartment of Basic PathologyFederal University of ParanaCuritibaBrazil Department of Dermatology&Laboratory of Medical Mycology Jining No.1 People’s HospitalJiningShandongChina Department of Medical Microbiology People’s Hospital of Suzhou National New&Hi-Tech Industrial Development ZoneSuzhouChina Center of Excellence in Fungal Diversity Mae Fah Luang UniversityChiang RaiThailand Thermo Fisher Diagnostics Specialty Diagnostics GroupLandsmeerThe Netherlands Guizhou Academy of Tobacco Science GuiyangChina Engineering Bioprocess and Biotechnology Post-graduation Program Department of Bioprocess Engineering and BiotechnologyFederal University of ParanaCuritibaBrazil

Chaetothyriales is an ascomycetous order within *** order is particularly known through the black yeasts and filamentous relatives that cause opportunistic infections in *** species in the order are consistently *** and habitats of species are highly diverse,and often rather extreme in terms of exposition and *** are defined on the basis of evolutionary history,which is reconstructed by time of divergence and concepts of comparative biology using stochastical character mapping and a multi-rate Brownian motion model to reconstruct ecological ancestral character *** is hypothesized to be with a rock-inhabiting life *** disparity increased significantly in late Jurassic,probably due to expansion of cytochromes followed by colonization of vacant *** diversification took place subsequently,but at a low level of innovation resulting in strong niche conservatism for extant *** are ecologically different in degrees of *** of the clades has adapted ant domatia,which are rich in *** derived families,similar processes have enabled survival in domesticated environments rich in creosote and toxic hydrocarbons,and this ability might also explain the pronounced infectious ability of vertebrate hosts observed in these *** systems of morphological classification poorly correspond with recent phylogenetic *** are hypothesized to have low competitive ability against neighboring microbes,which interferes with their laboratory isolation on routine *** dataset is unbalanced in that a large part of the extant biodiversity has not been analyzed by molecular methods,novel taxonomic entities being introduced at a regular *** study comprises all available species sequenced to date for LSU and ITS,and a nomenclatural overview is provided.A limited number of species could not be assigned to any extant family.

关键词： Black yeasts Phylogeny Ecology Ancestral reconstruction Evolution Nomenclature

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Development of Response Surface Methodology for Optimization of Congo Red Adsorption Utilizing Exfoliated Graphite As An Efficient Adsorbent

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Materials Today: Proceedings 2020年 22卷 2341-2350页

作者： Thinh Van Pham Thuan Van Tran Trinh Duy Nguyen Nguyen Thi Hong Tham Phan Thanh Tri Quang Dao Thi To Uyen Nhan Thi Hong Le Dai-Viet N. Vo Nguyen Trung Thanh Long Giang Bach NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology Ha Noi City Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Department of Chemical Engineering Pukyong National University Busan South Korea Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City Ho Chi Minh City 703500 Viet Nam Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Malaysia Deparment of Environmental Engineering An Giang University Long Xuyen City An Giang Province Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

In the present study, we developed an optimization model of CR adsorption onto EG using response surface methodology (RSM) as a statistical tool. The EG was structurally characterized using several techniques such as scanning electron microscope (SEM), estimation of N 2 adsorption/desorption isotherm and plotting of pore size. The EG was used as adsorbent to remove the CR from water. Three variables involving concentration (20-50 mg/L), pH (4-10), adsorption time (0-210 min) were investigated. To find out the optimal condition, we adopted Design Expert software-based RSM for the experimental design, 3D surface plotting, and optimization. The optimal results were found at concentration of 48.3 mg/L, and contact time of 188 min for the highest CR adsorption capacity at 53.423 mg/g. With high compatibility via confirmation test, it is suggested that the RSM can be the suitable method to optimize the adsorption of CR onto EG

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