Integral Solution Research Articles

Enhancing The Digital Ecosystem and Empowering Community Businesses In Pedurungan Lor Through The Productive Waqf-Based SIWAP

Based on the evaluation of the situation, there are several main problems that require priority handling in the effort to empower the novice community. These problems include limitations in capital, lack of integrated information, promotion, sales, and financial management systems, and lack of knowledge of the potential and challenges faced by Pedurungan Lor Village, Pedurungan District, Semarang. To overcome these challenges, the main objective of the startup community empowerment is to initiate a Productive waqf-based crowdfunding called SIWAP, with the aim of providing access to capital to goat farming groups, tourism village management, and product development from creative business groups in Pedurungan Lor Village. SIWAP will function as a tourism marketplace that not only provides a platform for promotion and sales, but also offers integrated solutions for financial management. The goals of the program include increased capital, turnover, and net profit of the business groups, publication through electronic media and national journals, and video documentation of activities. Additional expected outcomes include the establishment of SIWAP crowdfunding and intellectual property rights protection. The activity plan will include a survey of partner locations, design and creation of the SIWAP crowdfunding platform, training for system users, technology implementation, and regular mentoring and monitoring of the use of the SIWAP system by business groups in Pedurungan Lor Village, Pedurungan District, Semarang.

AI Integrity Solutions for Deepfake Identification and Prevention

The increasing complexity of deepfake technology has sparked significant worries over individual privacy, the spread of false information, and deficiencies in cybersecurity. Deepfakes have the ability to effectively modify audio and visual content, resulting in a growing challenge to differentiate between real and fake content. To address this critical challenge, the study is conducting a survey to reveal a broad range of perspectives on the familiarity, encounters, and concerns related to deepfake technology. In addition, the study evaluates the effectiveness of current strategies in addressing the spread of deepfake material and proposes future approaches for improving the integrity of AI. The survey was delivered digitally, and responses were examined to provide an in- depth analysis of the latest techniques and difficulties in the context of deepfake detection. The outcomes demonstrate a range of perspectives on understanding deepfakes with an explicit agreement on the importance of risk presented by harmful deepfake applications. Although the participants showed an understanding of the available interventions, they also identified considerable challenges and the need for improved awareness, robust detection tools, and ethical standards in AI development to address the challenges posed by deepfakes with the present detection method. Implementing AI ethical guidelines to avoid deepfakes has a significant and beneficial effect on several industries by providing protection against their harmful effects. By fostering AI ethical guidelines, these policies are able to foster societal trust, mitigate risk, and cultivate a more robust digital environment.

Compact silicon photonic-lantern mode (de)multiplexer based on tilt slot waveguide

As the key component in on-chip mode-division multiplexing systems, a compact silicon photonic-lantern mode (de)multiplexer is proposed and demonstrated using the shallow-etched tilt slot waveguide. The proposed six-mode (de)multiplexer is designed as a constant coupling length of 11.7 µm for each mode conversion and eliminates the adiabatic transition tapers for cascaded asymmetric directional couplers, which have an ultra-short total length of 69 µm. The measured peak insertion losses of the fabricated device for all mode channels are less than 1.2 dB, and the crosstalk is below -12.6 dB in a 60 nm waveband. Additionally, the simulation results indicate that the device has a good fabrication tolerance. The proposed mode (de)multiplexer is scalable and could provide a feasible solution for the dense integration of on-chip mode division multiplexing systems.

Direct Numerical Solutions to Stochastic Differential Equations with Multiplicative Noise.

Inspired by path integral solutions to the quantum relaxation problem, we develop a numerical method to solve classical stochastic differential equations with multiplicative noise that avoids averaging over trajectories. To test the method, we simulate the dynamics of a classical oscillator multiplicatively coupled to non-Markovian noise. When accelerated using tensor factorization techniques, it accurately estimates the transition into the bifurcation regime of the oscillator and outperforms trajectory-averaging simulations with a computational cost that is orders of magnitude lower.

Unexpectedly Sudanese Syrians: Issuing passports and the challenges of integration

Abstract Since the Syrian crisis began more than 10 years ago, over 11 million Syrians have been displaced. By 2015, Sudan hosted a large number of Syrians because it became the only country in the region that did not require visas for them, which is a result of the countries’ migration and foreign policies. For years, the more than 250,000 Syrians in Sudan were treated largely as unbothered “guests”: they were able to live, work, obtain an education, and health care on par with Sudanese without any additional permits or documentation. Most were young, educated men who came as labor migrants and to avoid military conscription in Syria. The Sudanese government further took on the unusual policy of issuing Sudanese passports to these Syrians who were otherwise unable to return, which prompted Syrians to unexpectedly envision and engender their identity as Sudanese, even letting their Syrian passports expire. After the ousting of Al Bashir in 2019, the transitional government changed the policy for Syrians and began requiring permits for residency, work, education, and access to health care. They also systematically revoked and confiscated Sudanese passports held by Syrians. This article examines the case of Syrians in Sudan whose potential durable solution of integration is being unwound by the same state that provided it. Syrians interviewed discuss the socio-political and subjective challenges experienced by this loss. The article concludes with a discussion about the unusualness of this case, especially as it relates to issuing passports with ambiguous promises of integration.

Багатокритеріальне оцінювання стандартизованих інтерфейсів бортових мереж наносупутників CubeSat

The technology of building CubeSat-class nanosatellites has created a breakthrough in exploring near space for research and education. The availability of commercial solutions for the rapid integration of hardware and software of a CubeSat under development and the launch of such a nano-satellite into Earth orbit as a parasitic payload has made this technology accessible and attractive to universities worldwide. Despite this popularity, the statistics of nanosatellite failures after launch require a systematic approach to their design and construction and the selection of off-the-shelf (COTS) components. The object of the study is to determine the overall efficiency of standardized network interfaces when used in the onboard network of CubeSat nanosatellites. The subject of the article is a method for comprehensively evaluating the effectiveness of standardized network interfaces for data exchange in the onboard network of CubeSat nanosatellites, taking into account typical scenarios for data and command exchange. The aim of the study was to substantiate the method of expert evaluation of the technical efficiency of standardized network interfaces for data exchange in the onboard network of CubeSat nanosatellites, taking into account the following factors: energy efficiency, multi-mastering capability, resistance to electromagnetic interference, redundancy, coverage following the OSI network model, data transmission speed, and complexity of network technology implementation by software. Objectives: To analyze modern methods of organizing onboard avionics networks of nanosatellites of the CubeSat class, formulate an expert comparison model, and compare the selected information onboard networks following the model and the list of selected networks and their protocols. Results: an expert model consisting of a 7-factor comparison was created, modern and most widely used in the industry onboard networks were selected, and each network was compared according to the proposed model. Conclusions: The two most common and efficient models, I2C and CAN, were selected as recommended for use in the avionics of the KhAI1Sat nanosatellite and the “Boryviter”/”Falco” onboard computer being developed by the authors. Although the difference in power consumption between these two types of networks is significant, each has certain advantages in terms of noise immunity, multicasting, and application.

Path integration solutions for stochastic systems with Markovian jumps

A path integration method for solving Markovian jump stochastic dynamical systems is presented. The Markovian jump process and the state vector of the system are combined into a new augmented state vector. The randomness of the Markovian jump is modeled by a stochastic process, which is merged with the stochastic perturbations to form the stochastic source affecting the evolution of the augmented system. Then a probability mapping is constructed, mapping the probability space of the stochastic source to the short-time transition probability density function of the augmented system. By solving this probability mapping, the short-time transition probability density function of the path integration method is obtained, thus a path integration method is customized for Markovian jump stochastic systems. Finally, a hydraulic relief valve system is used as an application example to demonstrate the availability of the path integration algorithm. The results suggest that the pre-compression parameters and coefficient of restitution of the plug can induce stochastic P-bifurcation phenomena. When the above two parameters are small, the system becomes unstable with the parameters taken in this example. Monte Carlo simulations prove that the proposed method effectively captures the transient and stationary responses of Markovian jump systems.

Accelerating Blockchain Applications on IoT Architecture Models—Solutions and Drawbacks

More and more IoT use cases require trustworthy computing from cloud/back-end services, which cannot necessarily provide a fully trusted execution environment, data immutability, and traceability. The integration of IoT with the blockchain technology is one of the most promising solutions to achieve the previously mentioned features in the IoT networks. Researchers are also interested in integration solutions, and several solutions are already present in the scientific literature. However, there are still some uncertainties in establishing a direct and effective interaction between an IoT device and the given blockchain. In this work, we propose the first IoT hardware architecture model designed to accelerate time-consuming operations of IoT-Blockchain. The proposed IoT hardware architecture model is programmed in SystemC-TLM and can provide a significant reduction in execution time, 53% and 18% when running Hyperledger Sawtooth and Ethereum applications, respectively.

Linked Data Generation Methodology and the Geospatial Cross-Sectional Buildings Energy Benchmarking Use Case

Cross-sectional energy benchmarking in the building domain has become crucial for policymakers, energy managers and property owners as they can compare an immovable property performance against its closest peers. For this, Key Performance Indicators (KPIs) are formulated, often relying on multiple and heterogeneous data sources which, combined, can be used to set benchmarks following normalization criteria. Geographically delimited parameters are important among these criteria because they enclose entities sharing key common characteristics the geometrical boundaries represent. Linking georeferenced heterogeneous data is not trivial, for it requires geographical aggregation, which is often taken for granted or hidden within a pre-processing activity in most energy benchmarking studies. In this article, a novel approach for Linked Data (LD) generation is presented as a methodological solution for data integration together with its application in the energy benchmarking use case. The methodology consists of eight phases that follow the best principles and recommend standards including the well-known GeoSPARQL Open Geospatial Consortium (OGC) for leveraging the geographical aggregation. Its feasibility is demonstrated by the integrated exploitation of INSPIRE-formatted cadastral data and the Buildings Performance Certifications (BPCs) available for the Catalonia region in Spain. The outcomes of this research support the adoption of the proposed methodology and provide the means for generating cross-sectional building energy benchmarking histograms from any-scale geographical aggregations on the fly.

Exploring Collaborative Co-Signing Intelligence and Parallel Distributed Algorithms for Integrating Internal and External Documents

In today’s complex and linked technology environments, attaining business efficiency and innovation is crucial. In this paper, an innovative architecture combining parallel distributed algorithms and collaboratively co-signing intelligent verification frameworks is introduced. By promoting safe and effective interaction among heterogeneous systems, this synergistic method seeks to improve the integration process. Diverse systems are proliferating in both internal and external domains, requiring sophisticated integration solutions. Real-time data interchange, interoperability, and security are common issues with existing methods. By using parallel distributed algorithms and intelligent verification models, the suggested framework aims to overcome these difficulties. The framework presents a novel approach to confirming the integrity and validity of data transferred between systems by utilizing collaborative co-signing. Co-signing increases security and confidence in the integrated environment by having several parties jointly validate the information. Through the introduction of parallel distributed algorithms and collaborative co-signing smart verification models, this research advances a comprehensive strategy for smooth integration of systems. The results highlight how the framework can facilitate safe and effective data interchange between external and internal systems, opening the door for more developments in connected technology environments in the future.

Do NGOs recognise the climate-biodiversity nexus? Insights from 107 climate NGOs in Germany

Biodiversity loss and climate change are deeply intertwined and constitute a complex and interdependent crisis. These interlinked sustainability issues need to be addressed through an integrated approach. However, governments have been slow to integrate the need to protect both climate and biodiversity into environmental governance. NGOs, as non-profit organisations promoting public good, are seen as having the potential to recognise and advocate for this much-needed holistic protection of climate and biodiversity. But to what extent and in what ways do NGOs recognise this climate-biodiversity nexus? This article addresses these questions through an analysis of 107 German climate NGOs, examining their 190 annual reports from two time periods, 2016/2017 and 2021/2022. We found that, while German climate NGOs have made significant progress in recognising the climate-biodiversity nexus, they lack recognition of the role of biodiversity in stabilising the climate and the unintended negative consequences of climate policies and measures for biodiversity, highlighting that NGOs are still far from being holistic environmental stewards. Climate NGOs need to integrate the interplay between climate and biodiversity objectives into their organisational activities and align their mandates to promote synergies and minimise trade-offs between climate and biodiversity actions. We suggest that one way forward is to increase collaboration between NGOs. NGOs could then complement each other’s expertise and be better placed to jointly contribute to finding integrated solutions for climate and biodiversity protection and mainstreaming biodiversity into climate policy.

Application of C(t)-integral Solutions in Extending ASME BPVC Section Xi Division 2 Code Case N-934 for Transient Creep Crack Growth

Abstract Creep crack growth is a phenomenon which arises in damaged metallics structures under combined primary and secondary loads in the creep regime. The High Temperature Flaw Evaluation Code Committee of ASME BPVC is evaluating methods in extending Code Case N-934 to capture transient creep crack growth. This paper provides context and basic examples on the selected approach to transient creep crack growth methods based on the C(t)-integral. The basis for selected C(t)-integral solution as analytical method is established, including an overview of its derivation. Practical assessments of a crack growing under creep conditions in a realistic component are conducted to illustrate the analytical approach. Additional considerations in the application of the analytical methods and limitations are discussed.

Generalized solutions for time $\psi$-fractional evolution equations

This paper focuses on the time fractional wave problem with the use of a new fractional derivative in Colombeau algebra. Using Banach's fixed point theorem and Laplace transforms, we give and prove the integral solution of the problem. In Colombeau's algebra, The existence and uniqueness of the solution are demonstrated using the Gronwall lemma.

Lax integrability and infinite superposition solutions of a (3+1)-dimensional Boiti–Leon–Manna–Pempinelli equation

Lax integrability and infinite superposition solutions of a (3+1)-dimensional Boiti–Leon–Manna–Pempinelli equation

Performance enhancement of PPP/SINS tightly coupled navigation based on improved robust maximum correntropy kalman filtering

Extended kalman filter (EKF) is widely used to integrated navigation system of global navigation satellite system (GNSS) and strapdown inertial navigation system (SINS). However, non-Gaussian noise and the uncertainty of measurement noise can seriously reduce the performance of EKF, so it is difficult to obtain an optimal GNSS/INS integration solution. At present, non-Gaussian noise processing is still a difficult issue in filter research. In this paper, an adaptive and robust maximum correntropy extended kalman filter (MCEKF) method based on Cauchy kernel function is proposed to solve the above problem. Thanks to the excellent properties of Cauchy kernel function, the proposed method can effectively avoid filter faults and has better stability. However, the performance of MCEKF depends on the select of kernel bandwidth parameter, which is a difficult problem in the engineering application of MCEKF. In this paper, the switching kernel bandwidth algorithm is employed to adaptively estimate the kernel bandwidth parameter to solve the tradeoff between convergence rate and steady-state misalignment in the MCEKF algorithm under constant kernel bandwidth. Finally, the performance of the proposed algorithm is verified by two sets of vehicle-mounted precise point positioning (PPP) and SINS tightly coupled integration experiments in urban environment. The results show that compared with EKF, the proposed method can significantly improve the positioning accuracy, that is, the PPP/SINS positioning accuracy based on GE, GR and GRE system is improved by 25.1 %, 2.5 % and 17.0 % in D196 experiment, and 23.5 %, 16.5 % and 31.8 % in D107 experiment, respectively. The velocity and attitude accuracy of the two methods are similar. The velocity errors of all schemes can reach cm/s level. The roll, pitch and heading errors of navigation-grade inertial sensor are all less than 0.12 degree. The roll and pitch errors of MEMS are less than 1.0 degree, the heading error of the G, GE, GR, and GRE systems are 1.719, 1.464, 1.676, and 1.475 degree, respectively.

Multi-DG qZSI based grid tied inverters

The increasing adoption of distributed generation (DG) systems, driven by their numerous advantages, has led to a growing utilization of hybrid systems. Multilevel converters have emerged as essential components in power electronics applications, offering benefits such as harmonic reduction. However, designing effective control strategies for multilevel inverters presents challenges. This paper proposes a multi-DG quasi-Z-Source Inverter (qZSI) designed with a cascaded H-bridge controller. The incorporation of qZSI in the system enhances reliability and component safety while enabling the implementation of additional shoot-through control. This feature facilitates the balancing of inequalities arising from the two DG sources, thereby improving disturbance rejection. Furthermore, a current control scheme is implemented on the AC side to seamlessly feed active power into the grid without introducing distortions in current injection. Overall, the proposed system addresses key challenges in multilevel inverter design and offers a promising solution for efficient and reliable grid integration of DG systems. This work is thus useful in variety of applications, including electric vehicles and environment sustainability.

Development of an innovative diffraction scattering theory of X-rays and electrons in imperfect crystals.

Fundamental equations describing the X-ray and electron diffraction scattering in imperfect crystals have been derived in the form of the matrix Fredholm-Volterra integral equation of the second kind. A theoretical approach has been developed using the perfect-crystal Green function formalism. In contrast, another approach utilizes the wavefield eigenfunctions related to the diagonalized matrix propagators of the conventional Takagi-Taupin and Howie-Whelan equations. Using the Liouville-Neumann-type series formalism for building up the matrix Fredholm-Volterra integral equation solutions, the general resolvent function solutions of the X-ray and electron diffraction boundary-valued Cauchy problems have been obtained. Based on the resolvent-type solutions, the aim is to reveal the features of the diffraction scattering onto the crystal lattice defects, including the mechanisms of intra- and interbranch wave scattering in the strongly deformed regions in the vicinity of crystal lattice defect cores. Using the two-stage resolvent solution of the second order, this approach has been supported by straightforward calculation of the electron bright- and dark-field contrasts of an edge dislocation in a thick foil. The results obtained for the bright- and dark-field profiles of the edge dislocation are discussed and compared with analogous ones numerically calculated by Howie & Whelan [Proc. R. Soc. A (1962), 267, 206].

Arc Connectivity and Submodular Flows in Digraphs

Let D=(V,A)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$D=(V,A)$$\\end{document} be a digraph. For an integer k≥1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$k\\ge 1$$\\end{document}, a k-arc-connected flip is an arc subset of D such that after reversing the arcs in it the digraph becomes (strongly) k-arc-connected. The first main result of this paper introduces a sufficient condition for the existence of a k-arc-connected flip that is also a submodular flow for a crossing submodular function. More specifically, given some integer τ≥1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ au \\ge 1$$\\end{document}, suppose dA+(U)+(τk-1)dA-(U)≥τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$d_A^+(U)+(\\frac{\ au }{k}-1)d_A^-(U)\\ge \ au $$\\end{document} for all U⊊V,U≠∅\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$U\\subsetneq V, U\ e \\emptyset $$\\end{document}, where dA+(U)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$d_A^+(U)$$\\end{document} and dA-(U)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$d_A^-(U)$$\\end{document} denote the number of arcs in A leaving and entering U, respectively. Let C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${\\mathcal {C}}$$\\end{document} be a crossing family over ground set V, and let f:C→Z\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$f:{\\mathcal {C}}\\rightarrow {\\mathbb {Z}}$$\\end{document} be a crossing submodular function such that f(U)≥kτ(dA+(U)-dA-(U))\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$f(U)\\ge \\frac{k}{\ au }(d_A^+(U)-d_A^-(U))$$\\end{document} for all U∈C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$U\\in {\\mathcal {C}}$$\\end{document}. Then D has a k-arc-connected flip J such that f(U)≥dJ+(U)-dJ-(U)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$f(U)\\ge d_J^+(U)-d_J^-(U)$$\\end{document} for all U∈C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$U\\in {\\mathcal {C}}$$\\end{document}. The result has several applications to Graph Orientations and Combinatorial Optimization. In particular, it strengthens Nash-Williams’ so-called weak orientation theorem, and proves a weaker variant of Woodall’s conjecture on digraphs whose underlying undirected graph is τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ au $$\\end{document}-edge-connected. The second main result of this paper is even more general. It introduces a sufficient condition for the existence of capacitated integral solutions to the intersection of two submodular flow systems. This sufficient condition implies the classic result of Edmonds and Giles on the box-total dual integrality of a submodular flow system. It also has the consequence that in a weakly connected digraph, the intersection of two submodular flow systems is totally dual integral.

Passive strategies for climate change mitigation in architectural heritage: the case study of Santa Maria in Trastevere Basilica, Rome

ABSTRACT According to the most recent climate projections, urban settings and historic centres will be affected by considerable increases in temperature extremes and heat waves as a result of climate change. For this reason, the issue of energy efficiency and indoor comfort in historic buildings has become a topic of major interest for the significant number of buildings in the national and European territories. The performance redevelopment of architectural heritage, particularly religious buildings, requires accurate design, through a careful assessment of the occupants’ needs and the historic building’s characteristics, to guarantee adequate levels of thermal comfort and ensure an indoor climate suitable for safeguarding the cultural asset. In this regard, the study investigates, through a data-driven approach and building performance analysis, the indoor comfort level of a religious building in the historical centre of Rome that presents phenomena of excessive indoor overheating. The objective is to identify passive cooling strategies, through the optimization of natural ventilation levels and reduction of surface temperatures of the envelope exposed to solar radiation, in order to propose different design scenarios. The results show how a data-driven process in a digital environment can significantly contribute to the identification of optimal and integrated design strategies and solutions.

Precision calculation of the entrance length for laminar flow of Bingham fluid between parallel plates with yield number from 0 to 1000

An estimate of the entrance length for a Bingham fluid flowing between parallel plates is needed in engineering applications. The dimensionless entrance length is a function of yield number. The primary objective of this study was to construct plots of dimensionless entrance length vs. yield number that could be used by practitioners for a quick estimation of the entrance length in a Bingham fluid entering between parallel plates, in a range of yield numbers from 0 to 1000. Three well-known calculation methods were used. The methods were found to yield mutually consistent results. A secondary objective of this study was to examine the sensitivity of the calculated entrance length to the value of a dimensionless parameter somewhat arbitrary chosen during the calculations. This parameter specifies the dimensionless value of the unyielded core velocity that is accepted as the core velocity at the end of the entrance region. In all three calculation methods, the entrance length was found to have a noticeable sensitivity to the variation of this parameter. The least sensitive method was the one based on the momentum integral solution. The findings necessitate further, more fundamental research on the entrance length in non-Newtonian fluids.