Archive of

Advanced Engineering Science

Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-06-09-2023-616

Abstract : The aim of this paper is to derive the oscillation criteria of fourth order delay differential equation of the form (r(t)〖([m(t)y(t)+p(t)y(t-τ)]''')〗^γ )^'+f(t)G(y(t-σ))=0 t≥t_0 under the condition that ∫_(t_0)^∞▒1/(r^(1/γ) (s)) ds<∞. where, r(t),m(t),p(t) are positive real valued continuous functions. f(t)≥0, and γ is a quotient of odd positive integers..
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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-02-09-2023-615

Abstract : The paper investigates the Byzantine Reliable Broadcast Channel (BRBC) in the context of Mobile Byzantine Failures (MBF). BRBC, a pivotal communication primitive in fault-tolerant distributed systems, ensures that all legitimate processes deliver an identical set of messages irrespective of the sender's correctness. The study extends the BRBC to a dynamic model where participants may switch between correct and Byzantine behaviors multiple times in a single execution. This new specification, termed BRBCM, is designed to handle this dynamic and challenging environment. We operate within a fixed set of processes, with each possessing a unique identifier, in a synchronous system where time is marked by sequential rounds divided into sending, receiving, and computation phases. The paper then elucidates on the Mobile Byzantine Failures model, where an external attacker can dynamically control a subset of system processes. Moreover, these processes are capable of identifying when they've been influenced by a mobile Byzantine agent through failure detectors called BFAO and CFAO. The heart of the study introduces the Mobile Byzantine Reliable Broadcast Channel Problem (BRBCM), a redesigned primitive to accommodate mobile Byzantine failures. This involves stringent conditions to maintain the integrity and validity of the broadcast in a dynamic environment. Through rigorous examination, we establish the impossibility of solving the CDFBM problem under standard conditions. However, with the introduction of the OCCD oracle, a solution becomes feasible. This research provides the protocol PCDFBM-RB, an extended model of Bracha's solution, tailored to address the unique challenges of mobile Byzantine reliable broadcast channels..
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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-02-09-2023-614

Abstract : Precise estimation of crop phenology is vital for optimizing farming practices and irrigation scheduling. Conventional methods often involve expensive equipment and high operational costs, making them less feasible for large-scale applications. To address this challenge, we applied a remote sensing-based approach to assess the spatial distribution of crop coefficients in the semi-arid region of Western Rajasthan, India. Leveraging the well-established Surface Energy Balance for Land (SEBAL) model, we integrated multispectral Landsat 8 imagery with the FAO Penman-Monteith (PM) method to generate crop coefficient distributions across farmlands. The entire process was executed on the cloud-based Google Earth Engine (GEE) platform, allowing for efficient and scalable analysis. Our results revealed a strong correlation between fluctuations in crop coefficients and changes in the Normalized Difference Vegetation Index (NDVI). Moreover, an inverse relationship was observed between NDVI and Land Surface Temperature (LST). Notably, the proposed approach yielded satisfactory results, filling the gap in practical and affordable tools for crop health monitoring and growth assessment. The SEBAL algorithm demonstrated high accuracy in predicting crop stress conditions, eliminating the need for soil and sub-soil characteristic information. Overall, our findings provide a cost-effective solution for farmers and administrators to monitor crop phenology at different spatial and temporal intervals, facilitating informed decision-making in agricultural management..
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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-27-08-2023-613

Abstract : The Venturi flow meter provides various measurement options in piped systems for liquids, gas, steam and slurries. Measuring fluid flow with a Venturi flow meter results in permanent pressure loss due to the friction on the walls of the meter, cone angles and geometry transition points. The ISO-5167 standard specifies the geometry and method of use for Venturi meters installed in a horizontal orientation for unidirectional flows with Reynolds numbers higher than 200,000. This research aims to investigate and compare the performance of a symmetrical Venturi meter with an ISO-5167 meter in terms of permanent pressure loss at upward inclination angles for flows with a Reynolds number of ≈34,000. The key findings from the research indicate that both symmetrical and ISO-5167 Venturi meters can be installed vertically to save room, and this does not increase the permanent pressure losses for single-phase incompressible isothermal low Reynolds number turbulent flows. Furthermore, the results indicate that the permanent pressure loss in a vertical orientation may decrease slightly, a trend particularly noticeable in the ISO-5167 Venturi meter..
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