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Did weekly economic index and volatility index impact US food sales during the first year of the pandemic?

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Financial Innovation 2023年第1期9卷 1502-1524页

作者： Narasingha das Partha Gangopadhyay Economists for Peace and Security-Australia Chapter SydneyAustralia Western Sydney University SydneyAustralia

We explore the impacts of economic and financial dislocations caused by COVID-19 pandemic shocks on food sales in the United States from January 2020 to January *** use the US weekly economic index(WEI)to measure economic dislocations and the Chicago Board Options Exchange volatility index(VIX)to capture the broader stock market *** validate the NARDL model by testing a battery of models using the autoregressive distributed lags(ARDL)methodology(ARDL,NARDL,and QARDL specifications).Our study postulates that an increase in WEI has a significant negative long-term effect on food sales,whereas a decrease in WEI has no statistically significant(long-run)***,policy responses that ignore asymmetric effects and hidden cointegration may fail to promote food security during pandemics.

关键词： COVID-19 Food sales US weekly economic index CBOE’s volatility index ARDL model Bewley transformation NARDL model QARDL model

Blockchain-Based Robust Data Security Scheme in IoT-Enabled Smart Home

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Computers, Materials & Continua 2022年第8期72卷 3549-3570页

作者： Anusha Vangala Ashok Kumar das YoungHo Park Sajjad Shaukat Jamal Center for Security Theory and Algorithmic ResearchInternational Institute of Information TechnologyHyderabad500032India School of Electronics Engineering Kyungpook National UniversityDaegu41566Korea Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia

The recent surge in development of smart homes and smart cities can be observed in many developed *** the idea to control devices that are in home(embedded with the Internet of Things(IoT)smart devices)by the user who is outside the home might sound fancy,but it comes with a lot of potential *** can be many attackers who will be trying to take advantage of ***,there is a need for designing a secure scheme whichwill be able to distinguish among genuine/authorized users of the system and *** knowing about the details of when and what IoT devices are used by the user,the attacker can trace the daily activities of user and can plan an attack ***,the designed security scheme should guarantee confidentiality,anonymity and *** of the schemes proposed in the literature are either non-blockchain based which involves inherent problems of storing data in a single-server or assuming weaker attack *** this work,we propose a novel scheme based on blockchain technology,assuming a stronger Canetti and Krawczyk(CK)-threat *** the formal and informal security,and comparative analysis,we show that the proposed scheme provides a superior security and more functionality features,with less communication cost and comparable computational cost as compared to other competent ***,the blockchain based simulation study on the proposed scheme has been conducted to show its feasibility in real-life application.

关键词： Internet of things(IoT) smart home ubiquitous computing blockchain security

Comparison between Merrifield–Simmons Index and Wiener Index of Graphs

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Acta Mathematica Sinica,English Series 2022年第12期38卷 2220-2230页

作者： Ke Xiang XU Kinkar Chandra das Ivan GUTMAN Meng Lu WANG College of Mathematics Nanjing University of Aeronautics&AstronauticsNanjing 210016P.R.China MIIT Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles Nanjing 210016P.R.China Department of Mathematics Sungkyunkwan UniversitySuwon16419Republic of Korea Facultyof Science Universityof KragujevacP.O.Bor 6034000 KragujevacSerbia

The Merrifield–Simmons indexσis the total number of independent vertex sets(including the empty set)of the graph *** Wiener index W is the sum of distances in all unordered pairs of vertices of *** construct some new graphs satisfyingσ>W and W>σ,*** particular,infinite graphs satisfying W>σare invented with graphs with diameter 2 and infinite ones satisfyingσ>W are discovered with so-called universally diametrical graphs.

关键词： Merrifield–Simmons index Wiener index Cartesian product independence number Fibonacci number universally diametrical graph

Simplistic hydrothermal synthesis approach for fabricating photoluminescent carbon dots and its potential application as an efficient sensor probe for toxic lead(II)ion detection

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Frontiers of Chemical Science and Engineering 2023年第5期17卷 536-547页

作者： Trisita Ghosh Rajkumar Sahoo Suman Kumar Ghosh Pallab Banerji Narayan Ch.das Rubber Technology Centre Indian Institute of Technology KharagpurKharagpur 721302India Department of Chemistry Indian Institute of Technology KharagpurKharagpur 721302India Materials Science Centre Indian Institute of Technology KharagpurKharagpur 721302India

The past decade has witnessed a variety of members of the carbon family along with exposure of carbon dots due to their magnificent properties in sensing,bioimaging,catalytic applications,biomedical fields,and so ***,we report the simple hydrothermal method to fabricate photoluminescent doped carbon quantum dots for the detection of noxious lead(II)***(II)ion is very venomous for both the environment and human health for which its detection is demanded area in the research *** as-prepared carbon dots show excellent photostability,low toxicity and significant photoluminescence properties along with good water *** with these properties,carbon dots have a quantum yield of approximately 15%.In the practical field of application,these carbon dots have been used as sensing probes for the detection of lead(II)ions with a detection limit of 60 nmol·L^(–1).The fluorescence intensity of carbon dots was remarkably quenched in the presence of the lead(II)ion selectively among all the tested metal ***,we have studied the Stern–Volmer relationship for lead(II)quenching along with the explanation of the probable quenching *** of the doped carbon dots in heavy metal ions sensing in an environmental sample was demonstrated.

关键词： carbon dots fluorescence heavy metal sensing practical application photoluminescence

From Laboratory to Field:Unsupervised Domain Adaptation for Plant Disease Recognition in the Wild

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Plant Phenomics 2023年第2期5卷 195-208页

作者： Xinlu Wu Xijian Fan Peng Luo Sruti das Choudhury Tardi Tjahjadi Chunhua Hu College of Information Science and Technology Nanjing Forestry UniversityNanjing 210037China Institute of Forest Resource Information Techniques Chinese Academy of ForestryBeijing 100091China Key Laboratory of Forestry Remote Sensing and Information System National Forestry and Grassland AdministrationBeijing 100091China Department of Computer Science and Engineering University of Nebraska-LincolnLincolnNE 68588USA School of Engineering University of WarwickCoventry CV47ALUK

Plant disease recognition is of vital importance to monitor plant development and predicting crop ***,due to data degradation caused by different conditions of image acquisition,e.g.,laboratory *** environment,machine learning-based recognition models generated within a specific dataset(source domain)tend to lose their validity when generalized to a novel dataset(target domain).To this end,domain adaptation methods can be leveraged for the recognition by learning invariant representations across *** this paper,we aim at addressing the issues of domain shift existing in plant disease recognition and propose a novel unsupervised domain adaptation method via uncertainty regularization,namely,Multi-Representation Subdomain Adaptation Network with Uncertainty Regularization for Cross-Species Plant Disease Classification(MSUN).Our simple but effective MSUN makes a breakthrough in plant disease recognition in the wild by using a large amount of unlabeled data and via nonadversarial ***,MSUN comprises multirepresentation,subdomain adaptation modules and auxiliary uncertainty *** multirepresentation module enables MSUN to learn the overall structure of features and also focus on capturing more details by using the multiple representations of the source *** effectively alleviates the problem of large interdomain *** adaptation is used to capture discriminative properties by addressing the issue of higher interclass similarity and lower intraclass ***,the auxiliary uncertainty regularization effectively suppresses the uncertainty problem due to domain *** was experimentally validated to achieve optimal results on the PlantDoc,Plant-Pathology,Corn-Leaf-Diseases,and Tomato-Leaf-Diseases datasets,with accuracies of 56.06%,72.31%,96.78%,and 50.58%,respectively,surpassing other state-of-the-art domain adaptation techniques considerably.

关键词： Plant breakthrough details

Emerging role of transforming growth factor-β-regulated long non-coding RNAs in prostate cancer pathogenesis

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Cancer Pathogenesis and Therapy 2023年第3期1卷 195-204页

作者： Bakhya Shree Koyel das Vivek Sharma Department of Biological Sciences Birla Institute of Technology and Science PilaniHyderabad CampusHyderabad 500078India

Prostate cancer(PCa)is the most common malignancy in *** aggressive therapy involving surgery and hormonal treatments,the recurrence and emergence of metastatic castration-resistant prostate cancer(CRPCa)remain a major *** of the transforming growth factor-β(TGF-β)signaling pathway is crucial to PCa development and *** also contributes to androgen receptor activation and the emergence of *** addition,TGF-β signaling regulates long non-coding RNA(lncRNA)expression in multiple cancers,including ***,we discuss the complex regulatory network of lncRNAs and TGF-β signaling in PCa and their potential applications in diagnosing,prognosis,and treating *** investigations on the role of lncRNAs in the TGF-β pathway will help to better understand PCa pathogenesis.

关键词： Prostate cancer TGF-β LncRNA Castration-resistant prostate cancer Androgen deprivation therapy Androgen-independent prostate cancer Prostate-specific antigen Benign prostatic hyperplasia

Recent developments in the asymmetric synthesis and functionalization of symmetrical and unsymmetrical gem-diborylalkanes

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Organic Chemistry Frontiers 2022年第3期9卷 838-852页

作者： Swagata Paul Kanak Kanti das Debasis Aich Samir Manna Santanu Panda Department of Chemistry Indian Institute of TechnologyKharagpur721302India

gem-Diborylalkanes are an important class of organoboron compounds as they function as a key building block in organic *** the last decade,there has been growing interest in the enantioselective synthesis of gem-diborylalkanes to access a sp^(3) chiral center with two functionalizable *** review summarizes the recent development of the enantioselective synthesis of gem-diborylalkanes and their application in asymmetric synthesis.

关键词： synthesis alkanes synthesis

CrysXPP:An explainable property predictor for crystalline materials

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npj Computational Materials 2022年第1期8卷 424-434页

作者： Kishalay das Bidisha Samanta Pawan Goyal Seung-Cheol Lee Satadeep Bhattacharjee Niloy Ganguly Indian Institute of Technology Kharagpur KharagpurIndia Indo Korea Science and Technology Center BangaloreIndia Leibniz University of Hannover HannoverGermany

We present a deep-learning framework,CrysXPP,to allow rapid and accurate prediction of electronic,magnetic,and elastic properties of a wide range of *** lowers the need for large property tagged datasets by intelligently designing an autoencoder,*** important structural and chemical properties captured by CrysAE from a large amount of available crystal graphs data helped in achieving low prediction ***,we design a feature selector that helps to interpret the model’s *** notably,when given a small amount of experimental data,CrysXPP is consistently able to outperform conventional DFT.A detailed ablation study establishes the importance of different design *** release the large pre-trained model *** believe by fine-tuning the model with a small amount of property-tagged data,researchers can achieve superior performance on various applications with a restricted data source.

关键词： materials. property crystalline

Closed-Form Solutions of Stress Intensity Factors for Semi-elliptical Surface Cracks in a Cylindrical Bar Under Pure Tension

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Acta Mechanica Solida Sinica 2022年第2期35卷 344-356页

作者： M.K.Ramezani S.Ramesh J.Purbolaksono R.das Centre of Advanced Manufacturing and Materials Processing Department of Mechanical EngineeringFaculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Department of Mechanical Engineering University of PertaminaJakarta 12220Indonesia Sir Lawrence Wackett Aerospace Research Centre School of EngineeringRMIT UniversityMelbourneVI 3000Australia

In this work,the stress intensity factors(SIFs)for a wide range of semi-elliptical surface cracks with different inclination angles in a cylindrical bar subjected to pure tension were investigated *** main parameters considered to evaluate the SIFs were the crack size ratio(a/d),the crack aspect ratio(a/c),and the crack inclination angle(0).The dual-boundary element met hod implemented in software BEASY was used to compute the SIF values for *** her more,the general closed-form solutions were proposed to evaluate the corresponding SIFs for Mode I,Mode II and Mode III types of fracture through curve fitting *** solutions can provide accurate and reliable values of stress intensity factors for a crack on a cylindrical bar under pure tension in a rapid way compared to those obtained using computational *** addition,these results can be used as inputs for failure studies and life evaluations of cracked cylinder under working conditions.

关键词： Stress intensity factor Surface crack Solid cylinder Closed-form solution Dual-boundary element method